Access Engineering PLC - Training Presentation

REHABILITATION & IMPROVEMENTS TO
COLOMBO – KANDY ROAD SECTION FROM
KADAWATHA TO NITTAMBUWA
8/12/2016 ACCESS ENGINEERING PLC
BOMBUWALA B.G.A.
EN 14 5011 80

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

PROJECT DETAILS
Project: 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 Billion
Project Duration: 18 months
Project Length: 23 km
Progress 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.

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

Earthworks

Cross Section of Roadway
7.4 m 7.4 m

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 sections
40mm thick Asphalt Wearing Course
Surfacing, 80mm(average) thick Asphalt
Binder Course(includes regulator for profile
correction)
Widening sections
40mm thick Asphalt wearing course and
80mm(average) thick Asphalt Binder Course
with a
325mm 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).

Detailed Cross Section of Roadway

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.

EARTH WORKS – ROCK FILLING &
EMBANKMENT FILLING
 After compacting, soil layers were laid and compacted one by one up to
1250mm(250 *5 layers).

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.

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.

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.

Dense Graded Aggregate Base
Coarse(ABC)
Unloading
Spreading using
Motor Grader
Providing roller
passes
Doing correction to
necessary places
Giving Levels

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

Structures

MAIN FEATURES OF THE REVISED
PROPOSAL

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.

DRAINAGES
Excavating
Formworking &
concreting
Cover slab
placing

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).

CULVERTS
Excavating & demolishing Screed pouring
Formworking, reinforcing
& concreting of base

CULVERTS
Formworking &
reinforcing of walls + slab
Concreting of walls + slab Levels checking

LABORATORY WORK
 Lab tests were done under following categories:
• Asphalt
Extraction test
Marshall test
Core cutting test
Asphalt stability and flow test
• Soil
Sand cone test
Procter compaction test
CBR test
DCP test
Atterburg Limit test
• ABC
AIV test
LAAV test
Sieve analysis test

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-
180
4-day soaked CBR at 95% MDD
(Modified)
Mold, Hammer, Gauge,
CBR test machine
AASHTO T-193

LABORATORY WORK
• Apparatuses
COMPRESIVE TESTING
MACHINE
CBR TEST MACHINE
AUTOMATIVE MARSHALL
COMPACTOR

LABORATORY WORK
• Apparatuses
CENTRIFUGAL ASPHALT
EXTRACTION APPARATUS
SPECIFIC GRAVITY FRAME
MOTORISED MARSHALL TEST
MACHINE

LABORATORY WORK
• Apparatuses
LOS ANGELES MACHINE
LIQUID LIMIT TEST
APPARATUS

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:

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

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.

BRIDGES
Jumbo bags
filling with soil
Placing around
embankment
Setting out by
TS

PILING
Placing tem. cover
& level checking
Setting out Tripod Soil boring

PILING
Taking samples Flushing out
Putting
reinforcement mesh
& concreting

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.

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.

Access Engineering PLC - Training Presentation

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