culvert inventory collection guidelines presentation€¦ · assessment checklist. ......

RTA

Culvert Inventory

Collection

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RTA

Culvert Inventory

Collection

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Introduction (cont’d)

Day 1

› 9.00am – 12.30pm Classroom Training

› 12.30pm – 1.00pm Lunch

› 1.00pm – Depart for field inspections

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Day 2

› 8.30am to 1.00pm – Field Inspections

› 1.00pm – Lunch and Evaluations

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› Why are we here??

›What do we need to accomplish??

› The Culvert Inventory Collection Guidelines

»Planning

»Equipment

»Inspector’s Responsibility

› The RTA Culvert Data Collection Form

› The Risk Assessment Checklist

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Why Are We Here?

Prevent the Preventable

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Why Are We Here? (cont’d)

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Why are we HERE?

› Specifically, this process is to be

undertaken in order to prevent culvert and

embankment failure which could possibly

cause loss damage to property, and

possible injury and loss of life.

Culvert Inventory

Collection Guideline

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The Culvert Inventory Collection

Guideline (CICG)

This Culvert Inventory Collection Guideline has been prepared for the following reasons:

› To guide all inspectors in the completion of the Culvert Inventory Collection Form;

› To guide all inspectors in completing the Risk Assessment Checklist.

› To ensure that a systematic and consistent approach is followed for the collection of the culvert inventory;

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General goals of the training include:

› Explaining the importance of this RTA process and

it’s inherent necessity;

› Introduction of the Culvert Inventory Collection Form,

and its correct usage;

› Introduction of the Culvert Risk Assessment

Checklist, and its correct usage;

› Certifying inspectors as competent, and issuing an

Inspector Number to each inspector.

CICG – Inspector Training

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Specific goals of the training include:

› Familiarising inspectors with issues such as culvert types, defect types, early embankment failure signs, and maintenance issues;

› Familiarising inspectors with the use of required equipment such as laser measuring devices, GPS units and correct recording of location coordinates;

› Ensuring that each inspector is fully capable of understanding the inspection and documentation process and can be certified as such;

› Ensuring that the limitations of this inspection process are known.

CICG – Inspector Training

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Prior to Field Work

› Obtained or developed a Safe Work Method Statement (SWMS) for culvert inspections from either your Company, or else your Project Manager;

› Undertaken an induction into the specific requirements of the next roadway location to be inspected. Eg, are there specific traffic control requirements for that section of roadway?

› Gained approval from their Project Manager that they are capable of safely carrying out the required inspections.

CICG – Safety

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Confined Spaces

› An inspector will not enter a culvert without

first having assessed all of the risks of

doing so. This includes whether the culvert

is a confined space. To enter a culvert, it

first has to be assessed as not a confined

space by a suitably confined space trained

person.

CICG - Safety

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Culvert Access› An assessment shall be made as to whether a

safe inspection is possible. Rope access may be required. The inspector shall be suitable trained with that equipment prior to using;

› If deemed unsafe to proceed, then a note should be made on the Culvert Data Collection Form in the Risk Assessment Comment box with wording such as “Culvert unable to be inspected – rope and harness required” or similar.

CICG – Safety

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› Locate culverts on design plan information;

› Locate culverts during the inspection process along a given section of roadway that have NOT been identified on the RTA design plans (through careful field observation);

› Provide a reliable record of the culvert condition in order for the RTA to assess the requirement for a further risk assessment for that culvert;

› Identify culverts that pose an immediate threat to public safety. If an immediate threat to public safety exists, the inspector MUST notify their Project Manager immediately, who will then notify their Asset Manager;

› Recommend routine maintenance actions.

CICG – Inspector Responsibility

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› Training completed and inspector number

obtained;

› Safety requirements met as in Section 2.2;

› The required culvert Identification details entered

from the information when available at the RTA

office;

› The required culvert Design Data entered from

information when available at the RTA office;

› Sufficient copies of the RTA Culvert Inventory

Collection Form for the session of work;

CICG – Planning Checklist

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› Field equipment gathered as per the requirements outlined in this guide;

› Field equipment to be checked to ensure it is in proper working order. The following should be reviewed as a minimum:» Enough water for the day;

» Batteries for GPS unit, camera, laser measuring device, mobile phone / 2 way radio;

» Petrol for the brush cutter;

» Sufficient petrol in vehicle;

» Vehicle in proper working order, including attached equipment such as flashing lights;

» Traffic control items required for the session are on board the vehicle as necessary.

CICG – Planning Checklist

Culvert Data

Collection Form v1.7

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Culvert Data Collection Form –

v1.7

› Summary of Requirements

» Identification;

» Culvert Location;

» Design Data;

» Culvert Details;

» Culvert Condition;

» Drainage Pits;

» Photo and Image Files;

» Risk Assessment Checklist;

» Notes for Data Entry.

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v1.7

3.1 Culvert Identification

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v1.7

3.1 Culvert Identification

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v1.7

3.2 Culvert Location

› This Section allows for an accurate

location to be recorded for each culvert

utilising Global Positioning System

hardware (GPS).

› If a culvert cannot be located in the field

(nominal 30 minutes), then note this in

the Risk Assessment Checklist Comment

box

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v1.7

3.3 Design Data

› Culvert design data is available from the

RTA design plans for that specific section

of roadway. These will be supplied by the

Project Manager. See Figure 3.3.1

(CICG) as an example of the RTA

Design Plans.

› Accurate Culvert Measurements!!

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v1.7

3.4 Culvert Details

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v1.7

3.4 Culvert Details

› Is the Culvert long enough

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v1.7

3.5 Culvert Condition

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v1.7

Road Surface Condition

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v1.7

Batter Condition

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v1.7

3.7 Data & Storage Requirements

Mandatory Photographs

› The first photograph of every culvert shall

include the culvert number, written by the

inspector in marking paint in clearly visible form.

› During the inspection process, inspectors shall

take photographs of the following aspects of a

culvert:

› The inlet;

› The outlet;

› The barrel.

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v1.7

Additional Photographs

› If there is damage to the culvert inlet or outlet, a photo showing this in detail and also an overall photo showing a general view of the layout of the damaged area.

› If there is damage to the embankment, a photo of the damage, plus an overall photo showing a general view of the layout of the damaged area.

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Risk Assessment

Checklist

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Risk Assessment Checklist

CHECKLIST ITEM WHAT TO LOOK FOR EXAMPLE PHOTO

External Condition

SUBSIDENCE

IN THE ROAD

• Visible dips in the

roadway;

• Suspension of passing

vehicles shows noticeable movement passing over

culvert;

• Look along roadway over

a long enough length to

allow depressions to be

seen;

• Longitudinal or transverse

cracking that extends into

the travelled lane.

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EXTENSIVE

PATCHING OF THE

ROAD ABOVE THE

CULVERT

• The presence of multiple

layers of patching on the

roadway above the

culvert;

• Patching is to repair

shape of roadway – i.e -

sub-pavement distress;

• If patching has repaired

roadway - guardrail may

be sagged.

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SIGNIFICANT

CRACKING OR

DEFORMATION OF THE

ROAD ABOVE THE

CULVERT

• Longitudinal or transverse

cracking on the roadway

above the culvert that is

greater than 5mm wide;

• If uncertain of cracking

type or extent – tick the

box

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HOLES OR CAVITIES

IN THE ROAD FILL

AROUND THE INLET

OR OUTLET

OR

ABOVE THE CULVERT

• Localised depressions in

the area surrounding the

roadway above the

culvert;

• Holes already established

in the surrounding

embankment.

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EMBANKMENT FAILURE

AT THE CULVERT

OUTLET

(SLUMPING,

CRACKING)

• Detached / missing end

structures (Headwalls,

wing walls) at culvert

outlet;

• Significant batter slump;

• Debris at inlet / outlet;

• Cracking in pavement

Headwall / wingwall

detached.

• Voids or scour holes

behind the headwall

SEEPAGE EMERGING

AROUND THE OUTSIDE

OF THE PIPE

• Water visually exiting out

from under and around

the culvert barrel.

• Evidence of backfill

entering into the barrel.

n/a

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SEVERE

SCOUR EROSION OF

THE ROAD FILL BATTERS

• Voids directly above

culvert greater than 150

mm deep

• Overtopping of the

roadway – some debris

remaining under

guardrail;

• Batter slump / significant

scouring.

SEVERE

SCOUR EROSION

BELOW THE OUTLET OR

AT THE INLET

• Overtopping of the

roadway – some debris

remaining under

guardrail;

• Slumping on inlet higher

up embankment;

• Scour on outlet side of

embankment.

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HEADWALLS MISSING

OR DISPLACED

• Missing headwall / wing

wall.

• Headwall / wingwall

separation that allows

embankment material to

erode between the

culvert and headwall.

INCONSISTENT FLOW

OF WATER BETWEEN

INLET AND OUTLET

• Visual flow or water

flowing into pipe but not

out.

• Visual flow or water

flowing out of the pipe

but not in.

n/a

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SQUEEZE POINT

AND/OR LOCALLY

STEEP BATTER

• Noticeable hinge points

in embankment due to

road widening but not

culvert lengthening;

• Batter slope steeper than

1:1.

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EXTENSIVE

CRACKING AND

DEFORMATION OF THE

INTERNAL WALLS

• Cracks in concrete barrel

units that run for the

length of the unit –

hairline cracks included;

• Cracking in headwall

may indicate further

cracking inside pipe;

• Any water or fill ingress

into the culvert.

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EVIDENCE OF

CORROSION OF STEEL

REINFORCEMENT

• Rust and pitting marks on

the exposed steel

reinforcement at any

location on the concrete

barrel.

SPALLING OR

DELAMINATION OF

CONCRETE

• Slices of concrete have

fallen away from the

main culvert.

• Exposure of steel re-

inforcement.

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NOTICEABLE

DISPLACEMENT OR

SEPARATION ACROSS

JOINTS

• Evidence of water or

embankment entering

the pipe through cracks

or through joints.

• Visible vertical

displacement in butt

joints.

EVIDENCE OF

GROUNDWATER

ENTERING INTO THE

PIPE

• Deposits of soil backfill in

the culvert invert that has

entered through cracks

(i.e. not debris that has

flowed through the pipe).

• Water flowing out of pipe

not flowing into inlet.

• Water coming through

the culvert joints.

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EVIDENCE OF

EROSION THROUGH

JOINTS

• Deposits of soil in the

culvert invert.

• Scour holes and voids

around the culvert barrel.

• Depressions and sags on

the roadway above the

culvert.

• Seepage inflows carrying

fines, soil accumulation at

joints).

BOWING OF CULVERT • Ponding of water in the

centre of the culvert.

• Visually the centre of the

culvert appears lower

than the outlet.

• NOTE here the sideways

diversion of the waterflow

indicating a bending of

the culvert base

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The Comment Box

› In cases where the inspector believes that immediate danger is being posed to the public, the word “URGENT” should be entered into the comment box.

› The following cases indicate the requirement to use the word “Urgent”:

» 50% or greater blockage of the inlet, outlet or culvert barrel;

» Cracking extending past the travelled lane;

» Guardrail hanging;

» Significant dip in the pavement; and

» Anything which causes a danger to vehicles or the general public.

culvert inventory collection guidelines presentation€¦ · assessment checklist. ......

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