technical note - tn 042: 2016 · esc 215 transit space . esc 310 underbridges . esc 410 earthworks...

Technical Note - TN 042: 2016


Subject: Update to T HR CI 12190 ST Service Installations within the Rail Corridor, version 1.0

Issued date: 10 June 2016

Effective date: 10 June 2016

For queries regarding this document [email protected]

www.asa.transport.nsw.gov.au

This technical note is issued by the Asset Standards Authority as an update to

T HR CI 12190 ST Service Installations within the Rail Corridor, version 1.0. The update provides

clarification around the requirements for non-Authorised Engineering Organisations (AEO) to

carry out non-rail work within the Sydney Trains Network.

The amendments to T HR CI 12190 ST are provided in the following sections of this technical

note. The section numbers map to the relevant sections of the standard.

2.2 Application Add the following sentence at the end of the last paragraph of the section.

Additional AEO requirements for the design and construction of non-rail services are set out in

Section 6 of this standard.

6. Applications for non-rail infrastructure service installations Delete the first paragraph. Insert the following at the start of the section.

Applications for the installation of non-rail infrastructure services on the rail corridor shall be made

through the Rail Corridor Management Group (RCMG). Technical aspects of the application shall

be undertaken and documented, where feasible, by an appropriate AEO.

However, it is acknowledged that in some cases, organisations carrying out the design and

construction of the crossing may not be AEOs.

© State of NSW through Transport for NSW of 2

mailto:[email protected]

mailto:[email protected]

http://www.asa.transport.nsw.gov.au/


In these instances, the AEO requirements of this standard shall be provided by Sydney Trains.

This is in accordance with the arrangements set out in Clause 25(b)(iii) of the Asset Standards

Authority Charter.

Authorisation:

Technical content prepared by

Checked and approved by

Interdisciplinary coordination checked by

Authorised for release

Signature

Date

Name Dorothy Koukari Richard Hitch Andrea Parker Graham Bradshaw

Position Senior Engineer Standards

Lead Civil Engineer Chief Engineer Director Network Standards and Services

© State of NSW through Transport for NSW of 2

Service Installations within the Rail Corridor

T HR CI 12190 ST

Standard

Version 1.0

Issued date: 03 September 2015

Important Warning This document is one of a set of standards developed solely and specifically for use on Transport Assets (as defined in the Asset Standards Authority Charter). It is not suitable for any other purpose. You must not use or adapt it or rely upon it in any way unless you are authorised in writing to do so by a relevant NSW Government agency. If this document forms part of a contract with, or is a condition of approval by a NSW Government agency, use of the document is subject to the terms of the contract or approval. This document is uncontrolled when printed or downloaded. Users should exercise their own skill and care in the use of the document. This document may not be current. Current standards may be accessed from the Asset Standards Authority website at www.asa.transport.nsw.gov.au. © State of NSW through Transport for NSW

http://www.asa.transport.nsw.gov.au/

T HR CI 12190 ST Service Installations within the Rail Corridor

Version 1.0 Issued date: 03 September 2015

Standard governance

Owner: Lead Civil Engineer, Asset Standards Authority

Authoriser: Chief Engineer Rail, Asset Standards Authority

Approver: Executive Director, Asset Standards Authority on behalf of the ASA Configuration Control Board

Document history

Version Summary of Changes

1.0 First issue

For queries regarding this document, please email the ASA at [email protected] or visit www.asa.transport.nsw.gov.au

© State of NSW through Transport for NSW



Preface The Asset Standards Authority (ASA) is an independent unit within Transport for NSW (TfNSW)

and is the network design and standards authority for defined NSW transport assets.

The ASA is responsible for developing engineering governance frameworks to support industry

delivery in the assurance of design, safety, integrity, construction, and commissioning of

transport assets for the whole asset life cycle. In order to achieve this, the ASA effectively

discharges obligations as the authority for various technical, process, and planning matters

across the asset life cycle.

The ASA collaborates with industry using stakeholder engagement activities to assist in

achieving its mission. These activities help align the ASA to broader government expectations

of making it clearer, simpler, and more attractive to do business within the NSW transport

industry, allowing the supply chain to deliver safe, efficient, and competent transport services.

The ASA develops, maintains, controls, and publishes a suite of standards and other

documentation for transport assets of TfNSW. Further, the ASA ensures that these standards

are performance-based to create opportunities for innovation and improve access to a broader

competitive supply chain.

This standard was developed by the Chief Engineer Rail unit of the ASA and approved by the

ASA Configuration Control Board.

This standard specifies the technical requirements for the design, installation and maintenance

of utility services, cables and pipelines within the rail corridor, and was developed from the

RailCorp standard ESC 540 Service Installations within the Rail Corridor, Version 2.2.

ESC 540 is withdrawn with the publication of this standard.

This standard is a first issue.

© State of NSW through Transport for NSW Page 3 of 27



Foreword

This standard is intended to be used by competent personnel engaged in the provision of

services relating to rail infrastructure. Compliance with the requirements in this standard will not,

by itself, be sufficient to ensure that satisfactory outcomes will be produced. Personnel

providing services based on the standard need to bring appropriate expertise to the matters

under consideration.

In addition to the requirements of this standard, asset decisions shall take into account the life

cycle cost considerations specified in T MU AM 01001 ST Life Cycle Costing.

If, when using the standard, it is considered that the intent of stated requirements is not clear, a

clarification should be sought from the ASA.




Table of contents 1. Introduction .............................................................................................................................................. 6

2. Purpose .................................................................................................................................................... 6 2.1. Scope ..................................................................................................................................................... 6 2.2. Application ............................................................................................................................................. 6

3. Reference documents ............................................................................................................................. 7

4. Terms and definitions ............................................................................................................................. 8

5. Safety requirements .............................................................................................................................. 10

6. Applications for non-rail infrastructure service installations ........................................................... 10

7. Services search ..................................................................................................................................... 10 7.1. Methods for locating existing services ................................................................................................. 11 7.2. Marking of services .............................................................................................................................. 11

8. Installation planning of services .......................................................................................................... 12

9. Above ground services ......................................................................................................................... 13 9.1. Design requirement for above ground services ................................................................................... 14 9.2. Collision protection for above ground services .................................................................................... 15

10. Below ground services ......................................................................................................................... 16 10.1. Design requirements for below ground services ............................................................................. 16 10.2. Geotechnical assessment for below ground services ..................................................................... 17 10.3. Design traffic load ............................................................................................................................ 19 10.4. Depth of cover ................................................................................................................................. 19 10.5. Direction of services ........................................................................................................................ 19 10.6. Carrier and encasing pipes .............................................................................................................. 19 10.7. Separation of services ..................................................................................................................... 20 10.8. Service pits ...................................................................................................................................... 20 10.9. Electrolysis ....................................................................................................................................... 20 10.10. Installation methods ......................................................................................................................... 21 10.11. Protection of rail infrastructure ......................................................................................................... 21 10.12. Trenching ......................................................................................................................................... 23 10.13. Markers ............................................................................................................................................ 24

11. Documentation....................................................................................................................................... 24 11.1. Design stage .................................................................................................................................... 25 11.2. Work-as-executed plans .................................................................................................................. 25 11.3. Record keeping ................................................................................................................................ 26

12. Maintenance requirements ................................................................................................................... 26

Appendix A R loading configuration .................................................................................................... 27




1. Introduction Services are utility assets used to transfer, transmit or transport data, electricity, liquids, solids,

gases and the like.

Services are installed above ground and below ground within rail corridors and outside rail

corridors.

Services may be owned by TfNSW, Transport agencies, or external third party organisations.

The interface requirements between services and the TfNSW rail infrastructure are set out in

Australian standards, TfNSW standards and legislation.

This document cross-references to associated TfNSW standards from the electrical, signals and

control systems, telecommunications and track disciplines. It also incorporates work health and

safety (WHS) and environmental regulations associated with services installations excavation,

and places emphasis on planning and protection of existing TfNSW rail infrastructure.

2. Purpose This standard specifies the technical requirements for the design, installation and maintenance

of utility services, cables and pipelines within the rail corridor to supplement AS 4799 Installation

of underground utility services and pipelines within railway boundaries.

2.1. Scope The scope of this document includes installation of services for the following:

• electrical

• signalling

• telecommunications

• water and sewerage

• stormwater drainage

• combustible liquids

• flammable fluids

The requirements for track drainage are specified in T HR CI 12130 ST Track Drainage.

2.2. Application The requirements of this standard applies to all parties involved in service installations within

TfNSW rail corridors including TfNSW, Transport agencies and external third party

organisations. External third party organisations include commercial organisations such as




Telstra and Optus, local Government authorities and providers of electrical, communications,

water, sewerage and gas utilities.

The requirements apply to both above ground and below ground services. Technical aspects

shall be undertaken and documented by an appropriate AEO.

3. Reference documents The following documents are cited in the text. For dated references, only the cited edition

applies. For undated references, the latest edition of the referenced document applies.

Australian standards

AS 1100.401 Technical drawing – Engineering survey and engineering survey design drawing

AS 1289 Methods of Testing Soils for Engineering Purposes

AS/NZS 3000 Wiring Rules

AS 4799 Installation of underground utility services and pipelines within railway boundaries

AS 5100 Bridge Design

AS 5488 Classification of Subsurface Utility Information (SUI)

AS/CA S009 Installation Requirements for Customer Cabling

Transport for NSW standards

ESC 215 Transit Space

ESC 310 Underbridges

ESC 410 Earthworks and Formation

EP 10 01 00 05 SP Requirements for Electric Aerials Crossing RailCorp Infrastructure

EP 20 00 04 01 SP Cable Route Selection Guide

EP 20 00 04 05 SP Cable Pits

EP 20 00 04 06 SP Underground Cable - Location Recording

SPC 207 Track Monitoring Requirements for Undertrack Excavation

SPG 0705 Construction of Cable Routes and Signalling Civil Works

SPG 0706 Installation of Trackside equipment

SPM 0123 Reinforced Pre-cast Concrete Cable Pits

T HR CI 12030 ST Overbridges and Footbridges

T HR CI 12070 ST Miscellaneous Structures

T HR CI 12111 SP Earthwork Materials




T HR CI 12130 ST Track Drainage

T HR EL 08006 ST Services Erected Above Overhead Wiring

T HR EL 12002 GU Electrolysis from Stray DC Current

T HR EL 20002 ST 1500 V DC Cables and Cable Ratings

T HR EL 20003 ST Underground Installation Configurations for High Voltage and 1500 V DC

Cables

T HR TE 01001 ST Communication Outdoor Cabling

T MU AM 01001 ST Life Cycle Costing

TMA 0491 Accurate Field drawing

TMA 0492 Data Capture Procedure

TMA 0493 Scope Procedure

TMA 0494 Work as Executed Procedure

TMA 0495 Infrastructure Services Data Policy

TMA 0496 Specification for Collection of Services Data

TMA 0497 Code and Layer Definitions for Services Identification

TMA 0511 Plan Symbols and Interpretation Guidelines

TMG 1440 Requirements for the Locating of Underground Services in the Rail Corridor

TN 016:2015 Overbridges and Footbridges – Earthing and Bonding Requirements

TS 20001 System Safety Standard for New or Altered Assets

Other references

Dial before you dig website - http://1100.com.au

NSW Sustainable Design Guidelines

RailSafe website - railsafe.org.au

RCMG website - www.transport.nsw.gov.au/railcorp/building-near-railway

WorkCover 2014, Excavation Work: Code of Practice, NSW

4. Terms and definitions The following terms and definitions apply in this document:

AEO Authorised Engineering Organisation

DSS detailed site survey; surveys for the acquisition of field data for the preparation of plans,

cross sections and long sections of underground and above ground services. © State of NSW through Transport for NSW Page 8 of 27

http://1100.com.au/

http://www.transport.nsw.gov.au/railcorp/building-near-railway



GPR ground penetrating radar

non-rail infrastructure infrastructure that is not considered necessary to enable a railway to

operate and includes services owned by external third party organisations such as Telstra,

Optus, local government authorities and other non-rail utility providers for electrical,

communications, water, sewerage, energy, gas and so on

rail corridor comprises the full volume, both above and below ground, between the centre-line

of opposing boundary fences. If no boundary fences are present, the extent of the rail corridor

shall be taken as 15 m from the centre-line of the outermost rail

rail infrastructure the facilities that are necessary to enable a railway to operate and includes -

(a) railway tracks and associated railway track structures; and

(b) service roads, signalling systems, communications systems, rolling stock control systems,

train control systems and data management systems; and

(c) notices and signs; and

(d) electrical power supply and electric traction systems; and

(e) associated buildings, workshops, depots and yards; and

(f) plant, machinery and equipment,

but does not include -

(g) rolling stock; or

(h) any facility, or facility of a class, that is prescribed by the national regulations not to be rail

infrastructure

RCMG Rail Corridor Management Group

RIM rail infrastructure manager; (as defined in the Rail Safety National Law (NSW)) "rail

infrastructure manager" , in relation to rail infrastructure of a railway, means the person who has

effective control and management of the rail infrastructure, whether or not the person-

(a) owns the rail infrastructure; or

(b) has a statutory or contractual right to use the rail infrastructure or to control, or provide,

access to it;

ULX an underline crossing which is a service crossing beneath a rail line

URX an under road crossing which is a service crossing beneath a roadway (for example, an

access road)

Definitions of other standard terms used in this document are provided in AS 4799 Installation of

underground utility services and pipelines within railway boundaries.




5. Safety requirements The design of service installations within the rail corridor shall consider safety for the

construction, operation, maintenance and decommissioning workers and of the potential users

of the infrastructure.

The Authorised Engineering Organisation (AEO) shall establish and implement a design

process system that manages safety assurance across the full life cycle of the assets. The

design process system shall be developed in accordance with TS 20001 System Safety

Standard for New or Altered Assets.

6. Applications for non-rail infrastructure service installations Applications for the installation of non-rail infrastructure services on the rail corridor shall be

made through the Rail Corridor Management Group (RCMG) TfNSW. Technical aspects of the

application shall be undertaken and documented by an appropriate AEO.

The RCMG distributes the application to internal TfNSW stakeholders for review and

engineering assessment including the appropriate configuration management board.

Subject to meeting all engineering and configuration requirements and reaching a satisfactory

agreement, the RCMG then advises the applicant whether approval is granted to proceed with

the installation of the service. Site work within or near the rail corridor shall not be undertaken

unless written permission is received from TfNSW via the RCMG.

All non-rail infrastructure service installations within the rail corridor shall be covered by an

appropriate agreement (Master Access Deed or Individual Access Deed) with TfNSW.

7. Services search A comprehensive services search shall be undertaken in order to identify any existing services

that may be affected by the proposed installation.

Services searches for non-rail infrastructure services shall be undertaken in accordance with

industry standard procedures and in consultation with the relevant authorities, including Dial

Before You Dig (DBYD). A services search is also required where footings in the ground are

proposed for service installations.

Service searches for TfNSW railway services within areas covered by an existing detailed site

survey (DSS) shall be undertaken in accordance with the following DSS procedures:

• TMA 0491 Accurate Field Drawing

• TMA 0492 Data Capture Procedure

• TMA 0493 Scope Procedure © State of NSW through Transport for NSW Page 10 of 27



• TMA 0494 Work as Executed Procedure

• TMA 0495 Infrastructure Services Data Policy

• TMA 0496 Specification for Collection of Services Data

• TMA 0497 Code and Layer Definitions for Services Identification

• TMA 0511 Plan Symbols and Interpretation Guidelines

In areas not covered by an existing DSS, service searches shall be undertaken in accordance

with the requirements of the rail infrastructure manager (RIM).

7.1. Methods for locating existing services Methods to confirm the location of existing underground services onsite shall be non-destructive

to the service and any protective elements. Following are some of the methods used to locate

existing services:

• use of electronic cable locating equipment

• use of ground penetrating radar (GPR) equipment

• potholing by hand digging

• potholing by vacuum excavation, which is a method that uses compressed air or water to

break up the ground and a vacuum to remove the loosened material

Electronic cable locating equipment may interfere with the operation of the signalling system.

The use of electronic cable locating equipment shall be in accordance with TMG 1440

Requirements for the Locating of Underground Services in the Rail Corridor.

Potholing to expose a service provides a greater guarantee of the precise location of a service

than the electronic or GPR methods.

7.2. Marking of services When the existing underground services are identified, they shall be ground marked using the

colour coding provided in Table 1.

Table 1 – Marking of services

Type of service Colour code

Sample of colour

Signalling or communication Pink

LV and HV power – internal and external Orange

External telecommunications White

Gas Yellow

Water, sewerage or drainage Green




Type of service Colour code

Sample of colour

Compressed air Light blue

Fuel, combustible and flammable liquids Red

8. Installation planning of services The installation of services within and near the rail corridor shall be carefully planned in order to

ensure that people, environment and property remain safe.

The planning process shall identify hazards associated with the proposed installation and work

methods and shall develop work methods to mitigate the hazards.

The planning of installation work by the responsible AEO shall incorporate the following

activities:

• Prepare an excavation work plan and safe work method statement (SWMS). The SWMS

shall address specific site factors relating to the proposal.

• Assess the installation process of the undertrack crossing (ULX) and the way it affects the

track settlement, any displacements and the safe passage of trains. Appropriate safe

working methods and worksite protection shall be developed.

• Ascertain the need to monitor any movement of the track or other adjacent infrastructure by

survey, real time monitoring during and after installation and the preparation of a track and

structures monitoring plan and alarming criteria.

• Organise and obtain applicable permits and approvals from the relevant authorities.

Services installations shall be carried out in accordance with relevant and current Work Health

and Safety (WHS) and environmental legislation, and WorkCover regulations. WHS and

environmental impacts shall be considered across the full asset life cycle. The latest railway

safe working information is available from RailSafe website. Environmental protection of the site

shall consider, assess and minimise environmental impacts in accordance with the relevant RIM

procedures and systems. NSW Sustainable Design Guidelines shall also be incorporated.

Service installations shall not affect the operation and maintenance of existing railway assets.

Locations of services shall consider future rail corridor usage and shall be installed to minimise

the services footprint within the rail corridor.

Excavation work shall comply with the requirements of the relevant RIM safety management

system documents including any guides to excavation and earthworks and Excavation work

code of practice 2014.




The Excavation work code of practice gives specific direction on legal requirements for the

following:

• shoring of excavations

• periodic inspections

• safety fencing

• excavations adjacent to buildings and structures

• flooding risks

• stacking of materials

• protection from falling objects

• work adjacent to or under overhead power lines

• manual handling

• lighting

• ladders and scaffolding

• mechanised plant and heavy machinery

• working in confined spaces

• use of personal protective equipment

• environmental protection

General earthworks and formation requirements including managing associated construction

hazards are referenced in ESC 410 Earthworks and Formation.

Where there is a potential for the track to be displaced during or after installation, a track

monitoring regime shall be implemented in accordance with SPC 207 Track Monitoring

Requirements for Undertrack Excavation.

Signal sighting shall comply with the requirements of SPG 0706 Installation of Trackside

Equipment.

Services installation shall be undertaken in accordance with the RIM safety management

system and with appropriate configuration change approval.

9. Above ground services Above ground services include aerial lines such as electrical and communication services,

free-standing structures carrying pipelines and services attached to bridges.

These services may run along the rail corridor or across the rail corridor.




Permitted installations of non-rail infrastructure above ground services include high and low

voltage power, telecommunications, water, sewerage and gas.

Valves, compressor stations and flare points for combustible liquids or flammable fluids shall not

be permitted within the rail corridor.

9.1. Design requirement for above ground services Electrical aerial crossings shall be designed and installed in accordance with

T HR EL 08006 ST Services Erected Above Overhead Wiring and EP 10 01 00 05 SP

Requirements for Electric Aerials Crossing RailCorp Infrastructure.

Electrical requirements for service crossings erected above overhead wiring, including those

suspended from bridges or similar structures are also contained in T HR EL 08006 ST.

Electrical earthing and bonding for bridges and structures located above railway tracks on the

TfNSW network shall comply with TN 016:2015 Overbridges and Footbridges – Earthing and

Bonding Requirements.

Rail infrastructure signalling trackside equipment shall comply with SPG 0706 Installation of

trackside equipment.

Aerial crossings for telecommunications and other services shall be designed and installed in

accordance with AS/CA S009, AS/NZS 3000 and T HR TE 01001 ST Communication Outdoor

Cabling.

Freestanding structures carrying services shall be designed in accordance with

T HR CI 12070 ST Miscellaneous Structures.

9.1.1. Services attached to bridges and structures Electrical requirements are provided in relevant standards including ESC 310 Underbridges,

T HR CI 12030 ST Overbridges and Footbridges and T HR CI 12070 ST Miscellaneous

Structures.

Design loadings for services attached to bridges shall be in accordance with relevant standards

including AS 1170, AS 5100, ESC 310, T HR CI 12030 ST and T HR CI 12070 ST. The bridge

or structure shall be assessed for the structural capacity to support the service loadings.

Services and fixings attached to bridges or structures shall be designed and installed by an

appropriate AEO as follows:

• in accordance with design codes and practices

• not have an impact on the structural integrity of the bridge or structure

• not create an obstruction that causes water to pond or debris to accumulate

• not infringe the clear walking space of walkways and the clear space of refuges




• not reduce the effective height of balustrades

• not obstruct or reduce access for inspection and maintenance, including the structure

immediately behind the service

• not adversely impact upon the performance of the asset and the network across the full life

cycle

• to accommodate bridge lifting by at least 100 mm in height for bridge maintenance

purposes such as bearing replacement

No services shall be attached to bridges or structures without the approval of the appropriate

RIM technical representative and with appropriate configuration change approval. The RIM

technical representative shall be an appropriately experienced and qualified senior bridges and

structures engineer.

9.1.2. Locations of above ground services Service installations shall comply with the minimum clearances specified in ESC 215 Transit

Space.

Other criteria for locating above ground services are as follows:

• access to TfNSW rail infrastructure shall be maintained as specified for the particular site

• provision shall be made for any future railway track or facility advised by TfNSW

• design of any structure supporting an aerial service shall be such that the number of

elements that are likely to be struck by a derailed train is minimised

• signal sighting shall comply with SPG 0706 Installation of trackside equipment

The structure shall not have any adverse effects such as reduced walking areas for railway

employees or reduced access for inspection and maintenance of the structure or the rail

corridor.

9.2. Collision protection for above ground services The design of piers or columns supporting service structures within the rail corridor shall comply

with the provisions of collision protection and loading as described in AS 5100 Bridge Design

and T HR CI 12030 ST Overbridges and Footbridges.

The principal requirement is to protect the piers and columns against damage from a derailed

train, which in turn may result in collapse of the structure onto the train. Requirements for risk

assessment are also described in T HR CI 12030 ST.




9.2.1. Location of piers and columns

The minimum clearance to track centre line from any pier or column shall be as specified in

ESC 215 Transit Space.

Piers or columns shall not be located between tracks except on platforms in accordance with

T HR CI 12030 ST Overbridges and Footbridges.

10. Below ground services Below ground (or underground) services include low or high voltage electrical, signalling and

telecommunication cables and pipelines conveying water, compressed air, sewerage,

combustible liquids such as petroleum, and flammable fluids such as gas.

The services may run along or across the rail corridor and pass beneath a rail line (ULX) or

roadway (URX). Although there are many existing non-rail infrastructure services that have

been installed longitudinally along the rail corridor, further installations shall not be permitted

unless approved by the Lead Civil Engineer, ASA.

Valves, compressor stations and flare points for combustible liquids or flammable fluids shall not

be permitted within the rail corridor.

10.1. Design requirements for below ground services Non rail infrastructure underground cables and pipelines shall be designed and installed in

accordance with AS 4799 Installation of underground utility services and pipelines within railway

boundaries and the requirements of this standard.

Rail infrastructure power cable installations shall comply with TfNSW standards including the

following:

• T HR EL 20002 ST 1500 V dc Cables and Cable Ratings

• T HR EL 20003 ST Underground Installation Configurations for High Voltage and 1500 V

DC Cables

• EP 20 00 04 01 SP Cable Route Selection Guide

• EP 20 00 04 05 SP Cable Pits

• EP 20 00 04 06 SP Underground Cable – Location Recording

Rail infrastructure signalling and communications service installations shall comply with

SPG 0705 Construction of Cable and Routes and Signalling Civil Works.

Rail infrastructure communication service installations shall also comply with T HR TE 01001 ST

Communication Outdoor Cabling and SPM 0123 Reinforced Pre-cast Concrete Cable Pits.




10.1.1. Locations of below ground services

Minimum clearances for non-rail infrastructure below ground service installations to the nearest

rail and adjacent structures and vulnerable areas such as drains, toes of embankments,

shoulders of embankments and tops of cuttings shall be in accordance with AS 4799.

Excavations for below ground rail infrastructure services along the rail corridor should be

located at least 3 m horizontally from the nearest rail of any track and may be located in the

formation including shoulder areas, in restricted locations. All services shall also be installed in

accordance with the requirements in Section 10.11 of this standard.

Services which are attached to bridges or structures shall not adversely affect the performance

of the asset and the network across the life cycle. Such attachments shall also be in accordance

with Section 9.1.1 of this standard.

When installation of a pipe through a concrete culvert opening is approved in accordance with

Section 9.1.1 of this standard, the pipe shall be located close to the culvert wall and as close to

the soffit as possible. The pipe shall be positioned by grouting under and over the pipe to

present a smooth surface to the water passing through the culvert. The pipe shall return

underground at each end of the culvert as quickly as practical.

Services shall not be installed in an open channel drainage system.

ULX underboring or open cut trenching shall not be carried out under or within 10 m of turnouts

or special trackwork (for example, catch points, expansion switches, diamonds, slips) without

the approval of the Lead Track Engineer, ASA.

Guidelines for selecting cable routes for high voltage electrical services, which minimises the

risk of damage to the cables or the potential to create a hazardous situation, are detailed in

EP 20 00 04 01 SP Cable Route Selection Guide.

Rail infrastructure signalling and communication cable routes requirements are contained in

SPG 0705.

Rail infrastructure communications routes requirements are also contained in

T HR TE 01001 ST and SPM 0123.

Trenching is permitted for below ground services running along the rail corridor and not crossing

under a track or access road, subject to the requirements of Sections 8 and Section 10 of this

standard.

10.2. Geotechnical assessment for below ground services An assessment of the geotechnical conditions shall be undertaken for all proposed below

ground service installations within the rail corridor. The geotechnical conditions may dictate the

most suitable installation location and method.




The geotechnical assessment shall consider the effect of the proposed installation on the track,

overhead wiring structures, embankments, cuttings and other infrastructure, including any

effects from changes in the water table. The geotechnical assessment shall also include an

investigation of the in-situ material where the proposed crossing will be located.

Any application to install non-rail infrastructure below ground services within the rail corridor

shall be accompanied by a geotechnical investigation report undertaken and prepared by an

appropriate AEO.

The geotechnical investigation for proposed ULXs shall include (but not restricted to) the

following:

• Boreholes or test pits at entry and exit points which shall have a minimum investigation

depth (below the base of proposed excavation entry/exit points and ULX invert) of

1000 mm or 4 times the underbore diameter whichever is greater.

• Boreholes or test pits at the toe of the ballast on either side of the line which shall have a

minimum investigation depth (below the base of the proposed excavation and ULX invert)

of 1000 mm or 4 times the underbore diameter whichever is greater. For double track lines,

an additional borehole or test pit shall be carried out in the six foot if feasible. For multiple

track lines, additional boreholes or test pits shall be carried out as required by the RIM (and

advised by the RCMG for non-rail infrastructure service applications).

The geotechnical assessment and investigation report for proposed ULXs shall be undertaken

and prepared by an appropriate AEO and shall include (but not restricted to) the following items:

• site description and results of investigation

• an accurately surveyed cross section along the ULX alignment showing current ground

surface, rail levels and positions, position of proposed ULX, existing underground services,

borehole or test pit information and correlation lines of subsurface layers between

boreholes or test pits, ground water levels and any other relevant information

• prediction of possible ground subsidence during the ULX installation, long term

deformations and assessment of effects of the proposed installation to track and nearby

structures

• recommendation for the most suitable installation method

• an assessment to determine whether or not a geotechnical engineer is required in

attendance during construction to monitor any suspect ground conditions and ground

movement and proposed monitoring if any




10.3. Design traffic load Pipelines and earthworks carrying underground services within the rail corridor shall be

designed for R20 vehicle loading as a minimum. Refer to Appendix A for details of the R loading

configuration.

Pipelines carrying underground services crossing under the tracks shall be designed for train

loads as specified in ESC 310 Underbridges. The impact factor (α) shall vary linearly from 1.5 at

0.3 m depth to 1.0 at 3.5 m depth or greater, where the depth is measured from the top of rail.

This load shall be applied as specified in AS 4799.

10.4. Depth of cover The minimum cover to underground services shall be as set down in AS 4799, except for

crossings under the track.

For crossings under the track the minimum depth below rail shall be the depth specified in

AS 4799 or 1600 mm, whichever is greater.

Where practicable, non-rail infrastructure ULXs shall be installed at greater than the minimum

depths specified. This ensures that the service is well clear of other existing services and future

TfNSW maintenance activities. The recommended minimum depth of cover for non-rail

infrastructure ULXs is 4 m below finished surface level, including drainage channel inverts and

planned future rail corridor surface levels.

10.5. Direction of services Non-rail infrastructure ULXs shall cross at an angle between 60° and 90° to the track if all of the

following conditions are satisfied:

• installation method is not by open cut trenching

• service pipeline is not more than 450 mm diameter

• depth is more than 4 m below finished surface level, including drainage channel inverts and

planned future rail corridor surface levels

All other non-rail infrastructure ULXs and all open cut trenched ULXs shall cross at an angle of

90° ± 5° to the track.

Non-rail infrastructure ULXs shall not have bends in plan view within the rail corridor.

10.6. Carrier and encasing pipes In addition to AS 4799 requirements, the need for an encasing pipe for a ULX shall be assessed

on a case-to-case basis by an appropriate design AEO.




Encasing pipes shall be provided for all ULXs conveying pressure pipelines and pipelines

carrying combustible liquids and flammable fluids.

Steel encasing pipes are not permitted in, or within 1 km of, electrified traction areas.

10.7. Separation of services Service trenches may be shared by high voltage cables, signalling and communications cables

and other services.

Different services shall be separated in accordance with the following standards:

• T HR EL 20003 ST Underground Installation Configurations for High Voltage and 1500 V

DC Cables

• AS 4799 Installation of underground utility services and pipelines within railway boundaries

• AS/CA S009 Installation Requirements for Customer Cabling

• AS/NZS 3000 Wiring Rules

The horizontal clear distance between separate ULX service trenches shall be at least 3 m.

10.8. Service pits The design of service pits for rail infrastructure underground power cables shall comply with

EP 20 00 04 05 SP.

The design of cable pits for rail infrastructure signalling services shall comply with SPG 0705.

The design of cable pits for rail infrastructure telecommunication services shall comply with

T HR TE 01001 ST, SPG 0705 and SPM 0123.

Pits and access chambers for non-rail infrastructure services shall be located outside the rail

corridor.

Rail infrastructure service pits within the rail corridor shall be located in accordance with

Section 10.1.1 of this standard.

Pits within the rail corridor shall be designed for road vehicle loads and rail vehicle loads (if

applicable) in accordance with Section 10.3 of this standard.

10.9. Electrolysis Electrolysis occurs in the electrified areas of TfNSW rail corridors. The issue of potential

corrosion and protection of the service from electrolysis shall be managed in accordance with

AS 4799 and T HR EL 12002 GU Electrolysis from Stray DC Current.




10.10. Installation methods Depending on the particular site conditions and specific geotechnical requirements, alternative

methods for the installation of underground services under tracks or access roads within the rail

corridor include the following:

• Cased auger boring (refer to AS 4799): This method is suitable where precise accuracy is

not crucial.

• Laser-guided micro-tunnelling: This method uses a laser-guided vacuum borer head with

articulated positive steering.

• Pipe jacking (refer to AS 4799): Pipe jacking methods are generally suitable for larger pipe

diameters and may be employed up to a distance of 100 m. Accuracy in alignment is

achieved by using a laser beam. In addition to requirements of AS 4799, for jacking

through non-cohesive soil where the pipe can be advanced ahead of excavation, removal

of soil in the pipe shall only proceed to within one pipe diameter behind the leading edge of

the pipe. Excavation shall not exceed more than 50 mm ahead of the leading end of the

pipe before the pipe is jacked forward. Excavation and soil removal staging is subject to

site specific geotechnical conditions and requirements.

• Directional drilling: This process is surface launched and may be tracked down to a depth

of over 100 m below the surface. Services may be laid up to a distance of 1000 m in a

single bore. Advantages include elimination of trenching and associated excavation and

shoring costs, greater safety, less disruptions to rail traffic and less delays owing to

unfavourable weather conditions.

• Tunnel boring: This method employs a steel cylinder equipped with a hydraulic excavator in

the front. Extracted material is removed with an auger or conveyor and a liner plate is

installed in the rear section as the borer progresses forward. Using this method, tunnels up

to 2400 mm in diameter may be installed.

• Trenching: Trenching with rail baulks or temporary tunnelling under tracks is permitted in

exceptional circumstances only. This method may necessitate a complete close-down of

the track.

10.11. Protection of rail infrastructure Excavation for services installation can be done by open cut trenching or trenchless methods

such as directional drilling or underboring and the like.

Care shall be exercised when excavating within the foundation influence zone of rail

infrastructure as there is a risk that the rail infrastructure may be disturbed or damaged. When

excavating adjacent to structures, there is a risk that the footings may be undermined or the

structure destabilised, resulting in structural failure and potential collapse.




Excavation shall not be permitted within 6 m or the influence zone of any structure unless a

prior documented structural stability analysis advice related to the effects of the excavation and

approval are obtained.

When installation of a service under or near a bridge or structure is approved, the associated

excavation shall not undermine the bridge or structure footing or lead to instability or sliding of

the abutment or pier or support. The stability of the abutment or pier or support shall be checked

for the temporary open trench condition and shall be demonstrated that the requirements of

AS 5100 have been met.

Excavation shall not be permitted within 6 m or the influence zone of the base, slope or top of

embankments and cuttings unless a prior documented geotechnical engineering stability

analysis advice and approval are obtained.

The approval shall be based on the results of an appropriate geotechnical and structural

investigation and shall be in the form of a certification by an appropriately experienced and

qualified senior geotechnical or structural engineer from the design AEO.

Following are examples of critical excavation areas:

• excavation at the base or slope of railway embankments, which may lead to destabilisation

and failure of the embankment

• undercutting of the base of railway cuttings

• trenching at the top of soil or soft rock cuttings and embankments, which may result in

water ingress and slope failures

• excavation in the vicinity of overhead wiring structure footings

• excavation adjacent to bridges, retaining walls, reinforced soil structures, buildings or other

structures that might undermine or destabilise the foundations

Some examples of disturbance or damage to the rail infrastructure are as follows:

• track subsidence

• disturbance to drainage systems and particularly drainage systems over railway cuttings

that may lead to failure of the cutting slopes or fouling of the tracks below

• damage to railway cess drains and disturbance to the flow of stormwater runoff

• damage to train examination or staff walkway areas

• damage to above ground railway equipment, such as signalling and communications

infrastructure

• damage to other existing underground services




10.12. Trenching Trenching shall be carried out in accordance with requirements set down in Section 8 and

Section 10 of this standard.

10.12.1. Width of trenches The width of trenches shall only be wide enough for installation and soil compaction around the

service or service ducts. The minimum requirement is the pipe diameter with an additional

clearance of at least 150 mm on each side.

10.12.2. Backfill and compaction Excavations under the tracks and for a distance of at least 3 m beyond the outer rails, and

including the whole of any embankment and any URX, shall be backfilled to the underside of the

capping layer with structural zone fill that complies with the requirements set down in

T HR CI 12111 SP Earthwork Materials. The structural zone fill shall be compacted to not less

than 95% of maximum modified dry density, as determined in accordance with AS 1289

Methods of Testing Soil for Engineering Purposes (all parts), for the top 1 m as measured from

formation level, and to at least 90% of maximum modified dry density for the remainder of the

open excavation.

Other excavations located further than 3 m from the outer rails or beyond the toe of an

embankment shall be backfilled with general fill or structural zone fill material that complies with

the requirements set down in T HR CI 12111 SP. The material excavated may be re-used if it

satisfies T HR CI 12111 SP requirements.

The general fill materials shall be compacted to not less than 95% of maximum standard dry

density determined in accordance with AS 1289 (all parts).

All specifications and limitations provided for general fill materials, shall also apply to the

subgrade.

Compaction shall be homogeneous throughout the lift thickness. Loose fill layer thickness shall

be 200 mm maximum when using hand held compacting equipment. Field compaction testing

requirements shall be as determined by the AEO responsible for design and construction.

The drainage and ground surface above and around backfilled excavations shall be reinstated

and graded to prevent ponding and to ensure that the flow of surface water is unrestricted.

Any disturbed URX or associated pavement materials shall be reinstated.




10.12.3. Capping layer

Where the service installation has disturbed the capping layer, the capping layer shall be

reinstated for a minimum depth of 300 mm from formation surface level. The extent of capping

layer shall be to the full width of the formation.

The material used to construct the capping layer shall comply with the requirements set down in

T HR CI 12111 SP.

The capping layer shall be compacted to not less than 95% maximum dry density (modified

compaction) determined in accordance with AS 1289 (all parts).

10.12.4. Disposal of excavated materials Disposal of excavated material shall be in accordance with AS 4799.

Any surplus excavated material and any decommissioned service materials shall be removed

from the rail corridor and disposed of at an approved location.

10.12.5. Ponding of water in open trenches At no time shall water be allowed to pond in open trenches. During rain or when rain is forecast,

or if there is active seepage into the open trench, then the trench shall be filled on the same day

as the excavation.

10.13. Markers Marker signs shall be installed in accordance with the technical requirements and procedures

set down in AS 4799. Marker signs shall also indicate depth and direction of the service.

In addition to above ground marker signs and if not specified in other referenced documents,

plastic warning tape shall also be laid in the trench at a depth of 300 mm below ground finished

surface level to act as a warning during subsequent excavation, fire break grading or access

road maintenance and so on.

The requirements of T HR EL 20003 ST shall apply for high voltage and 1500 V dc underground

cables.

Markers for rail infrastructure signalling and communication cable routes shall be installed in

accordance with SPG 0705.

11. Documentation Documentation requirements for service installations within the rail corridor comprise design

stage documentation, work as executed plans, and general record keeping.




11.1. Design stage Documentation complying with AS 1100.401 Technical drawing – Engineering survey and

engineering survey design drawing and AS 4799 shall be provided as part of the planning and

design process.

General requirements include a site survey and scaled plans and cross-sections showing the

following details:

• proposed location in plan view and rail kilometrage of the crossing, relative to the railway

boundary, tracks and other adjacent rail infrastructure to at least 10 m from the proposed

service

• proposed reduced levels of the crossing, relative to the ground, track, other infrastructure

and survey reference

• angle of the crossing

• details of the proposed type and construction of the crossing

• locations and details of affected drainage

• location of proposed valves, pits, masts, poles and other fixtures and fittings

• details of markers or other protection devices to be installed

• details of other adjacent services as determined from the services search

All engineering surveys for service installations within the rail corridor shall be established using

the coordinate system required by the RIM and the Australian Height Datum (AHD).

For underground services, the process for ensuring that the documentation complies with

TfNSW standards and the scope of data required to be captured are outlined in TMA 0492,

TMA 0493 and TMA 0495.

11.2. Work-as-executed plans Work-as-executed plans shall be prepared and submitted on the completion of all new service

installations and changes to existing services within 30 working days after practical completion

of each service constructed. Any variations to the approved plans shall be clearly marked,

particularly with respect to any change in location, changes in depth of services below ground or

direction of services.

For underground services, the plans shall be formatted as specified in TMA 0491, TMA 0496

and TMA 0497. Measurements shall be sufficient to enable the update or replacement of the

registered DSS plans in the TfNSW Central Planroom, the associated CAD files and the

information in the TfNSW corporate database.




All work-as-executed plans shall have an allocated TfNSW Central Planroom drawing number

and shall be recorded and managed by the relevant configuration management procedures

(refer to TMA 0494).

Specific procedures apply to the recording of the location of electrical underground cables,

including high voltage and 1500 V dc and these are detailed in EP 20 00 04 06 SP.

Additional requirements for work-as-executed plans are contained in AS 5488 Classification of

Subsurface Utility Information (SUI).

11.3. Record keeping Master copies of each Individual or Master Access Deed shall be maintained by the RCMG.

The relevant RIM shall maintain records of the technical aspects of service crossings.

Information including technical aspects, agreements, maintenance responsibilities and contact

details shall be available to relevant parties including TfNSW upon request.

12. Maintenance requirements The responsible RIM shall ensure the following:

• marker signs are not damaged, obscured or removed

• services are not damaged, particularly when undertaking earthworks such as clearing the

right-of-way, cutting firebreaks or installing and maintaining drainage

• installations on bridges are examined as part of the cyclic bridge examination program

• technical maintenance plans (TMPs) shall be updated to include any structure or service

specific requirements

Non-rail infrastructure service Installations shall be maintained by the service owner.




Appendix A R loading configuration The ‘R’ vehicle is a general access vehicle. R20 is a 3 axle configured rigid body truck with

gross vehicle mass of 20 tonnes. The wheel load contact areas shall be equivalent to the

leading three axles of the T44 truck load shown in Appendix A of AS 5100.7.


Figure 1 - ‘R’ loading configuration

technical note - tn 042: 2016 · esc 215 transit space . esc 310 underbridges . esc 410 earthworks...

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