CUU LONG CORPORATION FOR INVESTMENT, DEVELOPMENT
AND PROJECT MANAGEMENT OF INFRASTRUCTURE
(CUU LONG CIPM)

VAM CONG BRIDGE CONSTRUCTION PROJECT
UNDER CENTRAL MEKONG DELTA REGION CONNECTIVITY PROJECT

PACKAGE CW3A

CONSTRUCTION METHOD OF VAM CONG BRIDGE
FOR BORED PILE WORK – PYLON PY1,PY2

APRIL – 2014

JOINT VENTURE OF GS E&C – HANSHIN E&C


GS E&C - HANSHIN E&C JV
--------o0o--------

UNDER CENTRAL MEKONG DELTA REGION CONNECTIVITY PROJECT
PROJECT COMPONENT 3A:
VAM CONG BRIDGE CONSTRUCTION PROJECT

CONSTRUCTION METHOD OF VAM CONG BRIDGE
FOR BORED PILE WORK – PYLON PY1,PY2

CONTRACTOR

CONSULTANT

CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

CONTENT
I.

PROJECT’S GENERAL INFORMATION ................................................................. - 4 -

II.

SUMMARY OF WORK VOLUME ............................................................................. - 5 II.1

PYLON PY1: ................................................................................................................ - 5 -

II.2 PYLON PY2: ................................................................................................................... - 6 III. EQUIPMENT AND MANPOWER FOR EXECUTION................................................ - 6 III.1 SUBMITTED CONSTRUCTION EQUIPMENT ...................................................................... - 6 III.2 MANPOWER FOR CONSTRUCTION: ............................................................................... - 11 III.2.1

Chart of construction organization .................................................................. - 11 -

III.2.2 List of Sub-Contractor’s Manpower: ................................................................. - 12 III.3 PREPARATION WORK: ................................................................................................. - 13 III.3.1

Office staff and worker: ................................................................................... - 13 -

III.3.2 Material gathering yard: .................................................................................... - 13 III.3.3

Protection work: .............................................................................................. - 14 -


III.3.4 Electricity for execution:..................................................................................... - 14 III.3.5 Water source: ................................................................................................... - 15 -

IV.

III.3.6

Drainage during execution period: .................................................................. - 15 -

III.3.7

Provision and transportation of material ......................................................... - 16 -

MATERIAL ................................................................................................................ - 16 -

IV.1 SAND:........................................................................................................................ - 16 IV.2 STONE: ...................................................................................................................... - 17 IV.3 CEMENT: ................................................................................................................... - 18 IV.4 REINFORCEMENT: ...................................................................................................... - 18 IV.5 WATER: ..................................................................................................................... - 18 IV.6 ADDITIVE: ................................................................................................................. - 19 V.

EXECUTION ORGANIZATION: ............................................................................. - 20 V.1 PREPARATION FOR PILE EXECUTION. ........................................................................... - 21 V.2 POSITIONING AND ANCHORING FOR BARGE:................................................................. - 22 V.3 POSITIONING OF BORED HOLE: .................................................................................... - 22 V.4 LOWERING OF CASING: ............................................................................................... - 22 -

-1-


CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

V.4.1

Positioning of execution: .................................................................................. - 22 -


V.4.2

Lowering of casing: .......................................................................................... - 23 -

V.5 DEPLOYMENT

OF DRILLING OF PILE AND CLEANING OF BOREDHOLE FOR THE

FIRST TIME: .................................................................................................................. - 25 -

V.6 FABRICATION AND LOWERING OF REINFORCING STEEL CAGE: ...................................... - 26 V.6.1

Erection of reinforcing steel cage on the fabrication yard:................................ - 27 -

V.6.2

Intalling rebar cage into bored hole: ................................................................ - 28 -

V.7 BLOWING AND CLEANING OF BOREDHOLE FOR THE SECOND TIME: ............................... - 28 V.8 CONCRETE POURING OF PILE: ...................................................................................... - 29 V.9 CUTTING TEMPORATY CASING AND COMPLETING PILE HEAD: ....................................... - 31 V.10 CONSTRUCTION ORGANIZATION AND SCHEDULE: ........................................................ - 32 VI.

QUALITY CONTROL METHOD OF CONTRACTOR .......................................... - 34 -

VI.1 CONSTRUCTION ORGANIZATION ................................................................................. - 34 VI.2 QUALITY CONTROL SYSTEM AT SITE ........................................................................... - 35 V.2.1

Quality control department: .............................................................................. - 35 -

VI.2.2

Steps of quality control and acceptance: ........................................................... - 35 -


VI.3 ACCEPTANCE OF WORK ITEMS.................................................................................... - 38 VI.4 WORKS AND MATERIALS TO BE CHECKED AND ACCEPTED:........................................... - 39 VI.5 MATERIAL TESTING.................................................................................................... - 39 VI.6 METHODS ENSURING FOR CONSTRUCTION PROGRESS ................................................... - 39 VI.7 STEPS FOR ACCEPTANCE AND COMPLETION ................................................................. - 40 VI.8 LIMITATION MEASURES FOR IMPACT OF DEFECTS AND COUNTERMEASURES OF
DEFECTS DURING CONSTRUCTION:........................................................................................ - 41 -

VII.

MEASURES

OF

ENSURING

TRAFFIC

SAFETY,

FIRE

PREVENTION, LABOR SAFETY AND ENVIRONMENT SANITATION ................ - 43 VII.1 LABOR SAFETY: ......................................................................................................... - 43 VII.1.2 Citation of normative standards and legal documents on labor safety &
environment protection: ................................................................................................. - 43 VII.1.3 Human resource, policy, safety insurance conditions and improvement
measures ........................................................................................................................ - 43 VII.1.4 Specific methods: ................................................................................................ - 45 VII.1.5 Training for workers on labor safety: ................................................................. - 45 -

-2-


CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM


VII.1.6 Establishing Safety Rules on the site: .................................................................. - 46 VII.2 SAFETY FOR EACH CONSTRUCTION WORK................................................................... - 46 VII.2.1 General method .................................................................................................. - 46 VII.2.2 Safety in plan organization at onshore fabrication yard:.................................... - 47 VII.2.3 Safety in site plan organization at piling area:.................................................... - 47 VII.2.4 Safety in installing and using construction machines - electricity:....................... - 48 VII.2.5 Safety in reinforcing work: ................................................................................. - 50 VII.2.6 Safety in handling and transporting work: .......................................................... - 51 VII.2.7 Fire and explosion protection ............................................................................. - 51 VII.2.8 Construction safety in rainy season: ................................................................... - 53 VII.2.9 Environmental protection ................................................................................... - 54 VII.2.10 Measures for work protection, security in the area, and social order ................ - 56 VIII. CONCLUSION ............................................................................................................ - 58 -

-3-


CONSTRUCTION METHOD STATEMENT OF BORED PILE

I.

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

PROJECT’S GENERAL INFORMATION

Introduction
In the context of technical infrastructure development in all regions. The completed
work will contribute to shorten the Hau river, reducing traffic congestion, create
impetus in the development .One of the importand in central Mekong detal
connectivity project (CMDCP)-Vietnam.System will create a smooth road traffic, The
opening up opportunities for trade goods, create a breakthrough in economic
development, culture and society in the Mekong Delta region in particular, between
the western provinces to List Ho Chi Minh City and the country in general.
Vam Cong bridge across the Hau river connects Lap Vo Distric - DongThap province
and Thot Not Distric – Can Tho city.


Start point: Km23+831.06(intersection design project) at LapVo
distric

 Finish point:Km26+800.46(intersection design project ) over
91 highway at Thot Not Distric.
 Total length of bridge: L = 2969.4m.
Scope and structure:
Scope:
The Bridge will have permanent design using presstressing reinforced
concrete in accordance with standard 22TCN272-05.
Design vehicle load: HL93.
Design frequency: P =1%.
Earthquake level: level 8, MSK scale.
Navigation dimension: B×H = 110×37.5m.
Bridge cross section: Width of bridge deck Bdeck=24.5m, including:






4 lanes 4x3.5 =14.0m
Central median strip 1.5m.
Mixed lanes 2x3.0 = 6.0 m
2 edge strip 2x1.0 = 2.0m
Parapet 2x0.5 = 1.0m.

Structure:
Span arrangement: 39.7+10x40+2x30 + 15x40+210+450+210+24x40+39.7
Total length of bridge: L = 2969.4m.

-4-



CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

Vertical curve diameter of bridge R=400m, vertical slope of bridge approach road in
Thot Not Distric-Can Tho city side is i = 2.5 %, in Lap Vo Distric–Dong Thap
province side is i =(2.5-3)%.
Superstructure of bridge:










Main span structure:Cable-Stayed Bridge has 3 spans
(210+450+210)m from P28 to P29. The 25.8m wide deck consists of
two composite girders connected by cross beams, spaced at 4.0m.
Approach span structure: Use Super-T beam, includes 28 spans in
Dong Thap province(from abutment A1 to P28) and 25spans in Can
Tho city side (from pier P29 to abutment A2), length of spans which
near A1 is 39.7m, near A2 is 39.7 m,lenght of span P11,P12,P13 is
30m and length of other spans is 40m. The 24.5m wide span cross
section includes 11 beams, arranged by distance between two beams

a = 2.2m. Beam height H = 1.75m.
Bridge deck structure: 7cm asphalt concrete.
Bearing: use pot bearing for main spans and steel plate elastomeric
anti-displacement and verticalbearing for approach spans have antidisplacement ang horizontal.
Expansion joint: tooth of a comb shape (metal and rail).
Parapet, drainage pipes, lamp posts are made by hot dipped
galvanization steel.

Substructure:





II.

A1& A2 Abutments is reinforced concrete. Pile cap located on 12
reinforced concrete bored-piles with diameter  =1.5 m.
The approach bridge piers: Pier is 2 columns by cast-in-situ
reinforced concrete.
o Type 1:Pile cap located on 10 reinforced concrete boredpiles with diameter  =1.5m.
o Type2 :Pile cap located on 12 reinforced concrete boredpiles with diameter  =1.5m.
Pier PY1 and PY2: the same H variant. Pile cap’s dimension is
85x27.5x5 m located on 32 reinforced concrete bored-piles with
diameter  =2.5 m.

SUMMARY OF WORK VOLUME
II.1
-


Pylon PY1:

Reinforcing steel cage: type CB400V
Steel volume of 1 pile: 124.1 tons
Steel volume of 32 piles: 3971 tons

-5-


CONSTRUCTION METHOD STATEMENT OF BORED PILE

-

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

Concrete: compress-resistant concrete type C40 (40N/mm2).
Concrete volume of 1 pile: 554.55 m3
Concrete volume of 32 piles: 17425.6 m3

-

Casing :
Casing D2600, 20mm in thickness, 33 m in length: 32 (casings)

II.2 Pylon PY2:
-

Reinforcing steel cage: type CB400V

Steel volume of 1 pile: 126.08 tons
Steel volume of 32 piles: 4034.56 tons

-

Concrete: compress-resistant concrete type C40 (40N/mm2).
Concrete volume of 1 pile: 559 m3
Concrete volume of 32 piles: 17.888 m3

-

Casing :
Casing: D2600 in thickness, 37 m in length: 32 (casings)

III. EQUIPMENT AND MANPOWER FOR EXECUTION
- Because the construction plan of Pylons PY1 and PY2 is located on the Hau River,
all construction activities will be arranged on the barge system anchoring at the
position of construction at PY1 and PY2.
- Contractor will execute with 02 drilling sets at both of pylons PY 1 and PY2.
III.1 Submitted construction equipment

NO

MACHINE

CATEGORY

DEPAR
TMENT


QUANTI
TY

Set

02

Drilling pile D2500

NOTES

1

Drilling
machine

2

Crane

CS-5000, 500 Tons

Machine

01

Lowering casing, and steel
cage,

3


Crane

150 Tons

Machine

03

Drilling and pouring concrete

S600

-6-


CONSTRUCTION METHOD STATEMENT OF BORED PILE

4

5

Crane

Barge

KH500
120 Tons

3800 Tons


VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

Machine

No.

01

Craning and steel cage
fabrication

01

Working place of crane 500
tons and 01 crane 150 T,
Servicing for lowering casing
and steel cage, pouring
concrete

6

Barge

1800 Tons

No.


02

For 02 cranes of 150 Tons
servicing for drilling,
lowering casing, pouring
concrete

7

Barge

1500 Tons

No.

02

Storing tank of bentonite and
drilling system

8

Barge

650 tons

Piece

01


Transporting steel cage and
material from the bank

9

Tug boat

machine

02

Pulling and removing barge

10

Generator

Piece

01

Standby for drilling machine
and vibrating hammer

01

Standby for drilling machine
and vibrating hammer and
electrical system during no
electricity


11

Generator

for barge 3800T

450 KVA

250 KVA

Piece

-7-


CONSTRUCTION METHOD STATEMENT OF BORED PILE

12

Generator

150 KVA

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

Piece


01

Standby for steel cage
fabrication, and no electricity

13

Vibrating
hammer

150 KVA, 60KVA

Piece

02

Lowering casing and earth
floor

14

Air
compressor

13kg/cm2

Piece

02


Servicing for drilling machine
S600

15

Air
compressor

7kg/cm2

Piece

02

Servicing for bolt gun

16

Excavator

Komasu PC200

Piece

02

Excavate drilling soil

17


Sand
separator

Piece

02

Clarify bentonite solution to
reuse

BE-170

MACHINE, EQUIPMENT FOR FABRICATION AND LOWERING OF STEEL CAGE

1

Steel-bending
machine

Bending steel D40

Piece

02

2

Steel-cutting
machine


Cutting iron D40

Piece

02

3

Zinc-cutting
machine

Cutting zinc D3

Piece

02

-8-


CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

4

Welding
machine


Piece

15

4

Steel sheet pile

m

200

5

Bolt gun

Piece

04

6

Steel cage crane
support

Set

01


8

Casing hanger

Set

01

9

Leveling hanger
during lowering

Set

06

10

Steel to hang
cage

Set

05

11

Shackles type
80T, 20T, 10T


Set

18

12

Pully to level
casing

Set

02

13

Casing platform

Set

01

14

Cable to level
casing

Set

10


MACHINE, EQUIPMENT FOR CASING LOWERING AND DRILLING

1

Guide platform
to lower casing

Set

2

2

Drilling
machine support

Set

2

Piece

26

m

1000

3


4

Tank system to
provide drilling
fluid
Pipe system to
provide solution
D110

Type tank
25m3/piece

-9-


CONSTRUCTION METHOD STATEMENT OF BORED PILE

5

Shellfish
collector

D2500

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

Piece


1

6

Casing D2600 is
used to connect
from fixed
casing to
working
platform

m

20

7

casing D1100 is
35 m long used
to working
platform

Segment

09

8

Segment of

casing D900 is
35 m long
used to anchor
barge

Segment

04

9

Pump is used to
drill

Piece

23

MACHINE AND EQUIPMENT FOR POURING CONCRETE

1

Tremie pipe
with adequate
support
equipments

2

Hopper type

10m3

Set

02

Piece

02

ELECTRICAL SYSTEM AND WAREHOUSE AND OFFICE EQUIPMENT

1

System of
electric wire,
cabinet and
other
equipments
servicing for
construction

System

01

- 10 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE


VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

2

Office to work
in land and on
the barge with
adequate
equipments

Container

03

3

Adequate
standby
equipments
from warehouse

Container

04

III.2 Manpower for construction:
III.2.1 Chart of construction organization

Main Contractor (JV of GS E&C and Hanshin E&C):

PROJECT MANAGER
JU JIN SANG
TEL: 0122.80.28.114

DEPUTY PROJECT MANAGER
SAFETY MANAGER

CONSTRUCTION MANAGER

QC MANAGER

NGUYEN DINH TUAN

CHOI JUNG HYOO

TRAN VAN NGHIA

TEL: 0937.586.068

TEL: 0906.076.396

TEL: 0908.341.171

SITE MANAGER

SITE MANAGER

NGUYEN DO DINH THANG


DO QUANG TRUNG DUNG
TEL: 0939.299.168

TEL:

SITE ENGINEER

SITE ENGINEER

SITE ENGINEER

SITE ENGINEER

NGUYEN QUANG VINH

NGUYEN KIEN TRUNG

LE VAN KIP

NGUYEN LUONG TUAN KIET

TEL: 0942.511.119

TEL: 0942.153.628

TEL: 0986.850.852

TEL: 0915.397.557


- 11 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE

III.2.2

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

List of Sub-Contractor’s Manpower:

LIST OF MANPOWER
FULL NAME

POSITION

NOTES

I. Technical and Management Department
Nguyen Huu Toan

General management

Nguyen Duc Thanh

Technical staff

Than Van Chung


Technical staff

Tran Minh Duc

Technical staff

Nguyen Trung Son

Technical staff

Duong Duc Anh

Technical staff

Dang Quoc Hung

Technical staff

Tran Van Huong

Surveyor

Vu Van Dan

Surveyor

Le Minh Tuan

Material official


Tran Van Sinh

Material official

Nguyen Minh Chien

Chief of warehouse

II. Worker
Nguyen Huu Hai

Electrical group

Bui Van Thuan

Electrical group

Nguyen Van Hao

Mechanical group

Le Van Huan

Mechanical group

Nguyen Van Chung

Repairer


Nguyen Van Thinh

Repairer

III. Drilling Operator S600
Masayuki Iijima

Expert

Syuichi Murayama

Expert

Yutaka Furukawa

Expert

Nobuhito Nosaka

Expert

IV. Worker group for drilling and pouring concrete
Than Van Nhat

Head of group

50 workers

V. Worker group for steel cage fabrication
Nguyen Binh Son


Head of group

50 workers

- 12 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

III.3 Preparation work:
Because the construction plan of Pylons PY 1 and PY 2 is on the river, mainly
implemented on the barge, Contractor carry out building management office,
accommodation for workers and gathering yard of material and support equipment,
steel cage fabrication yard at the bridge end of Dong Thap side
III.3.1 Office staff and worker:
Contractor always appreciates and makes favorable condition for all workers at
both of construction teams. Because of the continuos execution of cast-in-place pile,
Contractor arranges to build the accommodation right on the site area to guarantee
about worker’s health, adequate living condition for 120 workers. Simultanously,
management office, domestic living house for officials on the site are built near to
execution area.
III.3.2 Material gathering yard:
a. Reinforcing steel yard:
All reinforcing steel for cast-in-place piles are processed locally at a fixed place
for the entire of Project. Reinforcing steel fabrication yard is on the side of Dong

Thap. Reinforcing steel is arranged on the soil surface compacted plainly and spread
15 cm of coarse aggregate. Reinforcing steel, after being fabricated into cages, will be
gathered right on the site before acceptance, then craned into boredholes. For the
steel-gathering yard, cradles are provided 30 cm-distance from the soil surface and
covered by tarpaulin to avoid raining. Area of steel cage fabrication yard has
dimension of 60mx50m, next to the yard of fabrication blended cage with the area of
5x4,5m, and fabrication yard of coupler of 10mx40m. Reinforcing steel fabrication
yard is located near the bank of Hau River for the convenience of transporting steel
cage to Pylons PY1, PY2.
Fabricated steel cage is placed at steel fabrication yard by combination of 34m.
After erecting completely, combination will be craned to projecting jetty of Hau
River’ side in order to be easy to load on the barge and transport to the pile position.

- 13 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

b. Gathering yard of construction equipment and equipment, material, and
reinforcing steel are clearly regulated with the division of transportation lanes and
arrangement as planned under the organization plan of the site.
III.3.3 Protection work:
At the site, one security team is arranged to guard 24/24h with 3 shifts, each
shift of 2 staff, security team is responsible for:
+ Checking activities of workers and transportation of machine and equipment
in and out of the site.

+ Checking security and order in the construction area, especially living
residence of Workers.
+ Checking protection equipment for officials and workers in and out of the
site, specifically:
- For officials and workers, security guards will check ID card before entering
the site. The card will be provided a private code for officials and workers to the easy
of recognization.
- People inside the site must wear hard helmets, protective shoes and protective
equipment when working on the river. Worker will wear yellow helmet; the official
and visitor will wear the white one.
- Execution is also divided into 3 shifts and regulated for each shift: shift 1: 6h
to 14h, shift 2: 14h to 22h; shift 3: from 22h to 6am.
III.3.4 Electricity for execution:
The main electrical source for execution will be supplied from substation of the
Contractor. Execution of PY1 will be supplied electricity from substation of 630KV
on the Dong Thap’s side, execution of PY2 will be supplied electricity from substation
of 750 KV on the Can Tho’s side. Additionally, Contractor also arranges 01 generator
of 450 KVA to make standby for concrete batching plant of 120m3/h and for vibrating
hammer of 150 KWW when lowering casing; 01 generator of 150KVA located at the
accommodation and fabrication yard on land, 01 generator of 250 KVA on the barge
- 14 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

at executing position of Pylon PY1 (or Pylon PY2) for standby to ensure full provision

of electrictity for construction work, including drilling machine, solution-mixing
machine, welding machine, water pump, air compressor, lighting for security and
execution in the night shift, etc.
Electric source and locating position of generator, switch are arranged at a
convenient place to easily control, switch it on or off during execution.
Grid electricity at the drilling position of pile is connected by Contractor
through cable line of 90 mm along the floor system from substation on the bank to the
executing position of Pylons PY1 and PY2.
III.3.5 Water source:
a. Water source for execution and living activities at the accommodation and
fabrication yard on land:
Contractor conducts to drill 02 industrial drilling wells with diameter D100 to
service for execution of accomodation. Filter reservoir system will be also built to
serve for domestic activities for workers.
Before applying water soure into execution work, Contractor will take water
samples for testing. If it does not meet standard, execution department will make
treatment solution to guarantee quality of water for execution.
b. Water source at the drilling position of bored piles at PY1, PY2:
Contractor will use Hau river water source to serve for hygiene of equipment
and mixture of drilling fluid. Before applying water soure into execution work,
Contractor will take water samples for testing.
Water standard for execution shall meet Standard TCVN 4453:1995 and
QCVN 08 : 2008/BTNMT.
III.3.6 Drainage during execution period:
a. Drainage at the accommodation and fabrication yard on land:

- 15 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE


VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

For drainage system in the area of the accommodation and fabrication yard on
land, it is included 2 types: waste water generated from execution and rain water,
these two types are collected to general drainage system of the site, waiting for
sediment before discharging into the general drainage system of the local.
b. Treatment for water of drilling fluid:
Bentonite that does not meet standard of usage will be transported by barge on
the tank and discharge into the catch-pit excavated at the position not affecting other
items of project or suctioned and transported to the regulated disposal place to ensure
environmental regulations.
III.3.7 Provision and transportation of material
The site Management Board is responsible for instruction to technical
departments to establish contruction progress, calculation of material demand,
necessary material for execution under progress and submit them to material supply
department.
Materials mobilized to the site must be approved by Employer and accepted by
Consultant. Material. The mobilized material shall be provided fully Minutes of handover
and certificate of origin.
All materials will be sampled under supervision of Consultant and transferred
to Laboratory for testing and accepted before putting into execution.
Experiment department evaluates on quality requirements before putting into
use.
IV.

MATERIAL


IV.1 Sand:

 Natural sand must have enough strength. Sand must be clear, the rate of clay,
organic and others particle shall comply with standard TCXDVN 7570:2006 and
AASHTO M6. The maximum combined quantity of soluble chloride and sulphat
in fine aggregate shall not exceed 1,000 ppm

 Sand is taken fromTan Chau – An Giang pit.

- 16 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

 Sand use for concrete must comply as follow:
Sieve Size (mm)
2 .5
1.25
0.630
0.315
0.150

Cumulative Passing Percentage by
Weight
80 - 100
55 - 85

30 - 65
10 - 35
0 - 10

 The rate of dirt particle comply specification as follow:
Item
Clay lumps
Material finer than 0.075 mm sieve:
+ Concrete subject to abrasion
+ All other concrete
Material coarser than 0.30 mm sieve floating on a
liquid having a specific gravity of 1.95

Maximum
%
Weight
0.25

by

3.0 (1)
5.0 (1)
0.5 (2)

IV.2 Stone:

 Rock is taken at Antraco – An Giang.
 Crush stone must be clear and do not have others particle as soil, organic and
others harmful particle, rate of dust clay do not exceed 1% comply with standard
TCXDVN 7570:2006 and AASHTO M80


 Grading of coarse aggregate must comply as follow:
Sieve size
(mm)
100
70
40
20
10
5

Percentage by weight (TCVN 7570:2006)
Amount remained on sieve for maximum and minimum
size (mm)
105-10
5-20
5-40
40
0
0
0
0-10
0-10
400
0-10
40-70 70
900-10
40-70
…
100

9090-100 100 90…
100

- 17 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

- Limits of deleterious substance must comply as follow:
Item
Clay lumps
Soft particles
Material finer than 0.075 mm sieve
Material floating on a liquid having a specific gravity

Maximu
m
1.0
5.0
1.0(1)
1.0(2)

of 1.95
IV.3 Cement:

 Cement use for constructing is type PCB40 Porland cement complied with

Vietnamese Standard TCVN 2682:2009. All cement used in the Work
conform to the following minimum requirements:

shall

 Cement shall be provided by domestic factory Nghi Son complied with
specification on bidding document and approved by Engineer.

IV.4 Reinforcement:
Reinforcement include reinforcing round steel type CB300-T and ribbed
reinforcing bars type C400-V comply with specification TCVN 1651:2008 and
must have certification of manufacturer attached on every lot.

 All the reinforcement shall be maintained to avoid damage surface, stain...
Reinforcement stored at the storage must be put on the woody frame, do not put on
the ground, reinforcement must be covered by canvas and marked ordinal for easy
taking.
IV.5 Water:

 Water for constructing use local water and comply with standard TCXDVN
302:2004.

 Contractor will test, analyse chemical component of water from any source
 Water use for concrete must be clean, do not have oil , acid, kalium, salt, organic
and others harmful particle for concrete.


Rate of clocid do not exceed 300mg/l for reinforcement concrete.




Do not use water have rate of sulphate (SO4) more than 1% weigh of it



Do not use water have PH index <4.
Water for cleaning aggregate have same specification like above.
- 18 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

IV.6 Additive:
 Additive for concrete such as early strength admixture, viscosity admixtur, waterreducing admixture...is used to improve characteristic of concrete mixture
comformed with bored pile construction.
 Additive must do not have any effect that decrease the strength of concrete,
additive have chlorine component do not use in any circumstance.
 Use additive must comply with indication of manufacturer and additive do not
have steel corrosion component, do not bad influence on concrete durability
Bentonite is the choice for drilling. Contractor is expected to use Bentonite
TRUGEL100 with additives Polyme CMC mixtured at a fixed ratio for test pile and
massive piles. Ratio of mixture is as follows:
Bentonite Trugel 100
Polymer CMC
Viscosity
PH

Density

0 -3 %
0.1 – 0.9 %
18 – 45 sec/960 cc
9-11
1.02 – 1.10

Method of gathering materials and equipment:
 All means of execution will be gatherred on the site depending on progress of
each work and basing on equipment mobilization of Contractor.
 Equipment- machine will be registerred, inspected and granted circulation
certificate before operation
 Reinforcing steel: is gatherred at the site on the bank under progress of execution
 Concrete: is supplied under progress of pile execution
 Casing: to be mobilized under each phase of execution of Contractor on the
barges.
 Bentonite and CMC: adequately gatherred for continuous execution.

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CONSTRUCTION METHOD STATEMENT OF BORED PILE

V.

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM


EXECUTION ORGANIZATION:

- 20 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

V.1 Preparation for pile execution.
- Before execution of bored piles, it is necessary to adequately gather and study
design documents, technological procedures, survey documents of project
geology, etc in the construction area.
- Survey geographic position, hydrology and climate, etc.
- Preparation of the construction plan, identification of landmark, axis of project,
service road, location of equipment gathering, fabrication yard for steel cage,
etc.
- Establish constrction schedule under requirements of Employer and Consultant.
- Establish sample documents and tables, construction diary for acceptance and
monitoring of execution period.
- Preparation of construction equipment, machine and material and experimental
tools.
- Establishwater supply system, drilling fluid supply system, concrete pumping
system, etc.
- Installation of electrical system must be safe to provide adequate capacity for
the drilling system.
- Check and trial-operation of the entire drilling system
- Check and trial-operation of the concrete pumping system

- Ensure safe execution of the entire system

- 21 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE

V.2

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

Positioning and anchoring for barge:
- On the barge, mark 2 points with interpolated coordinate from interpolated
coordinate of 2 centerlines in the same row.
- Use total station to guide barge into these 2 marked points.
- Anchor at 4 angles of the barge. Adjust the barge into construction position by
dropping or tensioning the anchor.
- Drive 4 steel pipes D900 – 35 m in length to anchor the barge in fix.

V.3

Positioning of bored hole:
- Positioning is based on the design document, positioning landmark and pile
arrangement plan to identify the centerline. The centerline is identified by the
total station. During deployment, there is inspection and acceptance of
Consultant’s Engineer after finishing.

V.4


Lowering of casing:
The barge 3800 tons is located into construction position and the following

equipments is anchored in fix on the barge:
- Crane 500tons
- Vibrating hammer MS200 HHF(150KW)
- Shaped Steel H400,H300, guide frame and positioning of drilling
position
- Casing D2600mm L=33m to 37m.
- And other support equipments
V.4.1 Positioning of execution:
- Use total station to identify the centerline and anchoring point on the barge
- 22 -


CONSTRUCTION METHOD STATEMENT OF BORED PILE

VAM CONG BRIDGE CONSTRUCTION
CENTRAL MEKONG DETAL REGION CONNECTIVITY
PROJECT (CMDRCP)-VIETNAM

- Install positioning frame and guide frame system at the position of lowering
casing
- These frames are directly installed into Beam H300 erected on the barge
through bolt system for the easy of installation and dismantling.
- Surveyor will identify the pile centreline and anchoring points by crossed
steel placed on the guide frame. Measure and mark distance from the pile centerline to
the sides of the guide frame. Weld 4 beams H300 on the guide frame is to create a
square of 2, 62mx2, 62m. The center of square will be coincident with the centreline

of pile.
V.4.2 Lowering of casing:
- Sequence of installation for casing D2600:
+ Step 1: Move barge 3800T to construction position
+ Step 2: Set up 04 soft anchors at 4 angles of the barge
+ Step 3: Adjust the soft anchors to move the barge 3800T to exact
construction position
+ Step 4: Use crane 500T and crane 150T to set up and install hard
anchors at 4 angles of the barge
+ Step 5: Use crane 150T to lift the guide frame to bolt to board of barge
3800T at position for casing installation
+Step 6: Use total station to position centerline of pile for casing
installation, then mark to the guide frame wall. Measure and draw exact position of
casing inside of the guide frame, weld bar H300 to the guide frame to position the
casing in the guide frame. Deviation of the guide frame will be ± 2cm comparing to
diameter of the casing.
+ Step 7: Use the crane 500T to lift Casing (coordinate with crane 150T)
to move casing to the guide frame. Lower the Casing slowly down to bottom of the

- 23 -