access engineering plc - training presentation
TRANSCRIPT
05/03/2023
REHABILITATION & IMPROVEMENTS TO COLOMBO – KANDY ROAD SECTION FROM
KADAWATHA TO NITTAMBUWAACCESS ENGINEERING PLC
BOMBUWALA B.G.A.EN 14 5011 80
05/03/2023 ACCESS ENGINEERING PLC
Access Engineering Ltd.
• VISION– To be the foremost Sri Lankan business enterprise in value
engineering• MISSION
– To meet the challenges in the development of multi sector civil engineering projects, providing innovative solutions whilst developing long term progressive relationships with all our stakeholders
http://www.accessengsl.com
05/03/2023 ACCESS ENGINEERING PLC
PROJECT DETAILSProject: Rehabilitation and Improvement of A001
Colombo - Kandy Road Section from Kadawatha – Nittambuwa.
Contractor: Access Engineering PLC
Consultancy: Road Development Authority
Project Value: Rs. 7.7 BillionProject Duration: 18 months Project Length: 23 kmProgress at the time of training: 25 months (7 km)Current Progress: 34 months (9.5 km)The rehabilitation includes improvements of road,
pavements and bridges.
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TRAINING SCHEDULE
TASK NAME DURATION (weeks)
Earthworks 3
Structures 3
Drainages 1
Culverts 2
Precast yard 0.5
Laboratory (QA/QC) 2
Finishes 0.5
Quantity Surveying 1.5
Bridge work & Piling 2
Total 12.5
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Earthworks
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Cross Section of Roadway
7.4 m 7.4 m
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MAIN FEATURES OF THE REVISED PROPOSAL
ITEM DESCRIPTION
Carriageway Four lane, 14.8m wide(2*7.4m)
Shoulders Hard shoulder 0.6m(2*0.3m)Soft shoulder 2.4m(2*1.2m)
Composition of Carriageway
Overlay sections40mm thick Asphalt Wearing Course
Surfacing, 80mm(average) thick AsphaltBinder Course(includes regulator for profile
correction)
Widening sections
40mm thick Asphalt wearing course and 80mm(average) thick Asphalt Binder Course
with a325mm thick dense graded base course and a 350mm thick soil sub-base and capping layer
and sub grade as per requirement(Binder thickness varies from section to section).
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Detailed Cross Section of Roadway
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EARTH WORKS – ROCK FILLING & EMBANKMENT FILLING
An embankment consists of 4 parts which are:• Rubble layer• ABC layer• Geo-textile membrane• Soil layer First the area was prepared by removing existing soil and then Rubble layer was
laid up to 700mm height and then ABC was laid up to 100mm. After putting membrane, the layers were compacted using 10-tonne compactor.
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EARTH WORKS – ROCK FILLING & EMBANKMENT FILLING
After compacting, soil layers were laid and compacted one by one up to 1250mm(250 *5 layers).
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EARTH WORKS – SUB-BASE AND BASE
Then sub-base bottom layer is filled up to about 200mm and sub-base top layer is filled up to 150mm(total 350mm) heights.
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EARTH WORKS – SUB-BASE AND BASE
• After that, Aggregate based course(ABC) first layer with 180mm thickness and
quarry dust were laid and compacted using Grader.
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Dense Graded Aggregate Base Coarse(ABC)• Provides uniform and stable foundation for the layers placed on top.• Firmly bonded with the asphalt binder and wearing courses.• Procedure for ABC top laying,
– First we had to install pegs in each chainage with additional 300mm space from new EOP and from the end of the design offset of the new road.
– Design level + 45mm was marked in the pegs by using level machine.– After that we had to provide 2 roller passes using roller.– Again we have to check the levels in each chainage and we have to install pegs from the
offsets of EOP, 6m from the center and 8.3m from the center.– Levels were given to the peg as design level + 14 mm and scratch ABC using grader.– After that 2 roller passes was provided.– Again we had to check the levels and we had to cut or fill ABC where necessary.– At last we gave 4 roller passes and checked the levels.
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Dense Graded Aggregate Base Coarse(ABC)
Unloading
Spreading using Motor Grader
Providing roller passes
Doing correction to necessary places
Giving Levels
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EARTH WORKS - SHOULDER• Constructing a soft shoulder.• Soil was compacted above the sub base for the shoulder for a 1.2m width. The
total height of the layer was 325mm.• At first, a 250mm layer was put and compacted by the 5-tonne compacter with 6
passes to a 200mm layer. Then a 150mm second layer was put and compacted to a 125mm layer. The cutting edge was 8.35m from center of the new road.
Backfilling by hand Backfilling by Bob-cat Compacting using 5-tonne
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Structures
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MAIN FEATURES OF THE REVISED PROPOSAL
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CULVERTS AND DRAINAGES - DRAINAGES
Constructing a line drainage in a highway and its importance. Site was cleaned and setting-out was carried by tape measurements to locate line
drainage path. Excavation levels were marked using Dumpy leveler. 50mm screed concrete was poured and on top of it. Base and walls of type 1 drain was constructed using GR.25 concrete. Cured previous concrete. Light weight cover slabs were placed. Hume pipes were placed between drain and culvert.
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CULVERTS AND DRAINAGES - DRAINAGES
Excavating Formworking & concreting Cover slab placing
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CULVERTS AND DRAINAGES - CULVERTS
Constructing a Box culvert in a highway and its importance. Existing road was cleaned and setting-out was carried by Total station & tape
measurements to locate Box culvert path. Excavation levels were marked using Dumpy leveler. Procedure:• Excavating and demolishing of existing culvert if there is any.• 75mm thick screed concrete (C15 (20)) pouring.• Formworking, reinforcing and concreting base (Grade 30 (20) - Ready mixed).• Formworking and reinforcing for wall plus lower hunch. • Formworking for slab/deck plus upper hunch.• Cleaning and De-watering.• Concreting wall, slab/deck plus hunches. (Grade 30 (20) - Ready mixed).
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CULVERTS AND DRAINAGES - CULVERTS
Excavating & demolishing Screed pouring Formworking, reinforcing & concreting of base
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CULVERTS AND DRAINAGES - CULVERTS
Formworking & reinforcing of walls +
slab
Concreting of walls + slab Levels checking
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LABORATORY WORK Lab tests were done under following categories:• Asphalt
Extraction testMarshall testCore cutting testAsphalt stability and flow test
• SoilSand cone testProcter compaction testCBR testDCP testAtterburg Limit test
• ABCAIV testLAAV testSieve analysis test
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LABORATORY WORK• Tests done to check the soil conditions and soil properties,
TEST NAME APPARATUS TEST METHOD
Atterburg Limit tests
Liquid Limit Liquid Limit apparatus AASTHO-T-89 , T-90
Plastic Limit - AASTHO-T-89 , T-90
Sieve analysis test
Sieves (mm)Shoulder:20, 5, 2.36, 0.600, 0.075, pan. Sub base:20, 5, 1.18, 0.300, 0.075 pan.
BS 1377 - Part 2
Modified proctor compaction test Mold , Hammer , Oven BS 1377 Test 13 / AASHTO T-
1804-day soaked CBR at 95% MDD
(Modified)Mold, Hammer, Gauge, CBR test machine
AASHTO T-193
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LABORATORY WORK• Apparatuses
COMPRESIVE TESTING MACHINE CBR TEST MACHINE
AUTOMATIVE MARSHALL COMPACTOR
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LABORATORY WORK• Apparatuses
CENTRIFUGAL ASPHALT EXTRACTION APPARATUS SPECIFIC GRAVITY FRAME
MOTORISED MARSHALL TEST MACHINE
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LABORATORY WORK• Apparatuses
LOS ANGELES MACHINELIQUID LIMIT TEST APPARATUS
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QUANTITY SURVEY WORK Conditions of Contract, Specifications, Bidding documents, Price fluctuations and
so on. As works I had done: taking quantities from drawings, calculating price fluctuations, checking drawing levels on CS and LS drawings.
Some of the documents I referred were:
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QUANTITY SURVEY WORK Codes of practices, standards and material references:• Sri Lankan standards• British standards• AASHTO Publications (2002 Edition)• ASTM Publications• FIDIC Documents• HMSO Publications• ICTAD Publications• TRL Publications• DIN
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BRIDGES Constructing a pile using percussion boring method. Coffer dam was constructed. Jumbo bags, filled with soil were placed around the
embankment in order to stop collapsing. To reduce the block of the flow, we place Hume pipes under the embankment at the beginning.
Procedure:• Locating bridge pile center using Total station.• Excavating for temporary cover.• Placing temporary cover and checking level and position at top.• Setting pile Tripod.• Placing rectangular case.• Placing chisel/cutter.• Combining a rod with the chisel and start boring till meeting bedrock.• Do socketing for 1m.• Flushing-out hole with Bentonite.• Inserting Reinforcement mesh.• Concreting pile.
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BRIDGES
Jumbo bags filling with soil
Placing around embankment Setting out by TS
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PILING
Placing tem. cover & level checking Setting out Tripod Soil boring
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PILING
Taking samples Flushing out Putting reinforcement mesh & concreting
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Health and Safety
• Access Engineering PLC, operating in infrastructure development field, shall provide and maintain high standard of health & safety for all its employees and general public who may be affected by the operation
• Creating awareness by training, sharing information & supervision and maintaining preparedness to meet health & safety emergencies to ensure a safe and healthy working environment at all offices and sites.
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Environmental Policy
• Access Engineering PLC recognizes that in carrying out its activities it has a responsibility to customers, employees and the general public to minimize environmental impacts. The environmental policy of Access Engineering is to:
• Ensure compliance with all applicable legal and other requirements, which relate to its environmental aspects.
• Promote environmental awareness and commitment to the policy amongst all employees and Stake Holders through training, and communications to encourage suppliers and subcontractors to apply sound environmental principles.
• Avoid the wastage of materials, water and energy by paying careful attention to their use.• Prevent pollution and minimize environmental disturbance from our activities.• Apply continual improvement by reviewing the environmental aspects related to our
activities by setting appropriate targets and objectives for improving performance.
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