123doc bien phap thi cong thu k95

LACH HUYEN PORT INFRASTRUCURE CONSTRUCTION PROJECT CONTRACT
PACKAGE No.6: CONSTRUCTION OF KM0+000 TO KM KM15+15.630 SECTION
(INCLUDING SHOP DRAWING)

METHOD STATEMENT OF TRIAL COMPACTION OF
EMBANKMENT CONSTRUCTION BELOW SUB-GRADE
K95 OF SECTION FROM KM0+00-KM4+501

DATE

REVISION

PURPOSE

ISSUED BY

01/12/2014

1

2nd Submission

Tran Thanh Phong

12/24/2014

0

1st Submission

Tran Thanh Phong

Lach Huyen Infrastructure Construction Project (Road and Bridge Portion)

Contract Package No.6

METHOD STATEMENT OF TRIAL COMPACTION
OF EMBANKMENT CONSTRUCTION BELOW SUB-GRADE K95
OF SECTION FROM KM0+000 TO KM4+501
TABLE OF CONTENT
1.

GENERAL .......................................................................................................................................... 2

2.

TRIAL COMPACTION LOCATION AND DIMENSION ........................................................... 2

3.

QUANTITIES .................................................................................................................................... 2

4.

WORKING TIMES ........................................................................................................................... 2

5.

SITE ORGANIZATION CHART .................................................................................................... 3

6.

MATERIAL........................................................................................................................................ 3

7.

EQUIPMENT AND MANPOWER.................................................................................................. 3

8.

METHOD STATEMENT ................................................................................................................. 5

8.1. PREPARATION ................................................................................................................................ 5
8.2. MATERIAL ELEVATION ..................................................................................................................... 5
8.3. CONTROL PLAN AND MOISTURE ADJUSTMENT ................................................................................. 5
8.4. CONSTRUCTION PROCEDURE.................................................................................................. 6
9.

QUALITY CONTROL PROCEDURE............................................................................................ 8

10. SAFETY CONTROL......................................................................................................................... 8
11. ENVIRONMENTAL CONTROL .................................................................................................... 9

APPENDIXES:
Appendix 1 - Trial Compaction Location ...............................................................................10
Appendix 2 –Organization chart................................................................................................11
Appendix 3 – Inspection sheet for trial compaction .................................................................12
Appendix 4 – Document of Equipment ......................................................................................13

1

Lach Huyen Infrastructure Construction Project (Road and Bridge Portion)

Contract Package No.6

1. General

This method statement describes the trial compaction for the embankment,
which will be approved by the Engineer in accordance with Technical
Specifications - Division 3: Earth works - Section 03400: Embankment
construction and section 03900: Soft soil improvement measures.
The object of this trial will be determined the optimum moisture content and the
relationship between the number of passes of compacting equipment and density
obtained for the embankment material under trial (K95 density); Affirm the quality
control method; Determine the spread layer thickness before compaction and
propose the thickness of each embankment layer (after compaction).
2. Trial Compaction Location and Dimension

The trial compaction area will be located in the main road at the station as
attached Appendix 1 and may be adjacent location depending site condition and the
contractor shall be submitted for the Engineer approved before carry out of the work.
The dimension of the trial compaction area is Width x Length = 10m x 50m and
thickness of sand layers before compaction are 25cm, 30cm.
For each kind of trial compaction layer h=25, 30 we shall be carried out for
three layers to ensure the quality depending on actual construction site.
3. Quantities

Trial compaction quantities shall be prepared as following table:
No.

1

Material
Fine sand

Quantity
300

Unit
m3

Remark

4. Working times

We shall work during daytime and 5days/week but when on the construction process
of construction requires time extension then we will carry out overtime work under
the Engineer.
The proposed working time for construction:

2


Lach Huyen Infrastructure Construction Project (Road and Bridge Portion)

Shift
Time
Working shift per week
Working shift per month

AM
8:00~12:00

Contract Package No.6

PM
1:00~5:00

5days/week
20~23days/month

Working plan for overtimes works shall be submitted and approved by the Engineer.
5. Construction schedule

Construction schedule shall be referred to “ Overall Project Execution Program”
approved by Engineer ( Rfe.No STCJV/20140719-3) and the Employer and updated
in every weekly and monthly meeting.
6. Site Organization Chart

Organization Chart is as the attached appendix 2.
Select Team Phu Thinh Company to carrying out trial compaction.
7. Material

- The material to be used for trial compaction work is sand for embankment
as proposed material that submitted to the Engineer;
Layer of 50 cm below Sub-grade
- A layer of 50 cm below subgrade (embankment) shall be in compliance with the
requirements for each item according to Table No.1 below. In case the material is
sand, Liquid Limit (LL) ≤ 55% according to TCVN4197-95 (or AASHTO T89),
Plasticity Index ≤ 27% according to TCVN4197-95 (or AASHTO T90).

- The minimum CBR of layers less than 100 cm below subgrade level shall be 8%
according to 22TCN332-06 (or AASHTO T193:90).
- The minimum CBR of layers more than 100 cm below subgrade level shall be 6%
according to 22TCN332-06 (or AASHTO T193:90).
TABLE 1 Classification of Materials Suitable for Embankment (AASHT M145)
General Classification:

Granular Materials (35% or less passing sieve 0.075 mm)
A-2(*)

A-1
Group Classification:

A-3
A-1-a

A-1-b

A-2-4

A-2-6

Sieve Analysis, Percent Passing:
2.00 mm (Sieve No. 10)

50 max

---

---

---

---

0.425 mm (Sieve No. 40)

30 max

50 max

51 min

---

---

0.075 mm (Sieve No. 200)

15 max

25 max

10 max

35 max

35 max

---

---

40 max

40 max

6 max

N.P.

10 max

11 min

Characteristics of fraction passing 0.425 (Sieve No. 40):
Liquid Limit:

---

Plasticity Index:

6 max

Types of Significant

Stone fragments,

Constituent Materials

gravel, and sand

Fine sand

General Rating

Silty or clay gravel and sand

Excellent to good

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Lach Huyen Infrastructure Construction Project (Road and Bridge Portion)

Contract Package No.6

(*) A-2 can be used for embankment construction upon the Engineer’s consent based
on the actual conditions, laboratory test results, and testing on trial sections
performed with the proposed material.
8. Equipment and manpower

- The equipment used for the trial compaction work is shown in below table. In case
other type roller is be used for compaction work, another trial compaction test will
be carried out as necessary.
List of
No.
Capacity
Type, Mode
Quantity Remark

equipment
1

Bulldozer

110 ~140CV

1 each

2

Excavator

0.6~ 1.6m3

1 each

3

Static roller

8-16T

As appendix 4

1 each

4

Vibrating roller

16~25 T

As appendix 4

1 each

5

Water pump

36-80m3/h

1 each

6

Dump truck

7Ton

4 each

7

Dump truck

25Ton

3 each

8

Theodolite

1 each

Survey

9

Level
equipment

1 each

Survey

10

Lab testing
equipment

For Field
density test

LAS-XD250

1 set

Note: The site laboratory LAS-XD250 was submitted to the Engineer by letter
LH/JV-ENG/165 July 29, 2014.
The manpower will be involved for the trial compaction work, is shown in below
table:
Item

Quantity

1

Foreman

1

2

Machinery Operator

3

3

Site engineer

2

4

Worker

5

5

Lab Staff

2

6

Survey team

1
4

Remarks


Lach Huyen Infrastructure Construction Project (Road and Bridge Portion)

9. Method statement

Contract Package No.6

The construction procedure will be followed below steps and shall be instructed by
the Engineer.
9.1. Preparation

- The location of trial compaction work will be on area after site clearing and
grubbing work finished. Marking the trial compaction area at 4 corners by bamboo

pile;
- Sand material should be approved by the Engineer, checking at material storage yard
(gather sand at the area Km4+040-Km4+080) in accordance with mechanical
characteristics of sand before transporting to the site;
- Calculating necessary sand quantity for trial compacted section based on the
thickness of filling layer before compacted thickness 25, 30.
9.2. Leveling Material

After Sand transported to the site & dumped at the required positions, the contractor
will carry out leveling layer by layer according to the horizontal by bulldozer.
Using bulldozer to flatten material layer by layer with uniform thickness h=30, 25.
9.3. Control plan and moisture adjustment

After spreading the sand out on the compaction area, the sand moisture will be
checked, if the actual moisture less than 3% or higher 1% optimum moisture the
work of spreading and compaction can be carried out. In case of the actual moisture
> 3%, the sand will be spread and exposed to the sun to reduce the moisture to Wop
(3%> Wop >1%), if the actual moisture less than 1% the work of supply more water
by water pump and tank truck is necessary.
9.4. Work Execution steps

The contractor will carry out the trial construction of 25cm layer, if the density
meets requirement, the contractor will apply for construction of 25cm layers in
whole route.
The construction procedure will be followed below steps:
- Use the bulldozer to level the area of trial compaction smoothly;
- Marking the trial compaction area at 4 corners by bamboo pile;
- Use bulldozer to level the sand smoothly. Before compaction, the thickness of sand
layer shall be 25. The trial compaction layers shall be compacted and shaped to a 4
% grade from the center to both sides for drainage of rainwater during construction;

- Compact from out site to in side
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Lach Huyen Infrastructure Construction Project (Road and Bridge Portion)

Contract Package No.6

- Use static roller with 10-12T compact 3 times/1 point.
- Use vibrating roller with 25T compact 5 times/ 1 point.
- Check the density if it achieves K95, the contractor will stop for defining
compaction factor.
- If it does not achieve the required density, the contractor will use vibrating roller
with 25T for compaction 2 more times. After the contractor for will check the
density, if it still doesn’t achieves K95, the contractor will keep compacting 2 more
times up to the density K95 define compaction factor.
The accepted compaction sequence shall be applied for embankment construction
work.
The chart form for trial compaction report:
Compacting equipment *

Density

Passing number

Density

Moisture

6

Lach Huyen Infrastructure Construction Project (Road and Bridge Portion)

Contract Package No.6

10. Quality control procedure
NO

Checking
quarry

Find other quarries

OK

Transporting material to
storage yard

Tacking and
testing
sample

NO

OK

Surveying existing
ground by surveyor

Transporting material to
construction site

Spreading material

NO

Checking
thickness
OK

Compaction

NO

Field
density test
OK

Checking thickness

Test result report approved

Apply to construction

7


Lach Huyen Infrastructure Construction Project (Road and Bridge Portion)

Contract Package No.6

11. Safety control

- Prior to the commencement of works, training courses shall be held for all
employees to master the construction procedures, specifications and project safety.
- Specific duties and responsibilities shall be assigned to all positions in the
construction activities. Highest attention shall be paid during the process of the
works. Personal protective is supplied for all employees.
- All employees shall have to obey the site manager’s instructions. The operation of all
equipment shall conform to the specific procedure for each type.
- Any deficiencies found during the construction shall be immediately reported to the
site manager for proper and prompt measures to be taken.
“Safety Control Plan” shall be conforming to Approved Project Safety Control Plan.
(Reference to letter (Ref.No.SMTC20140519-2) dated 19th may, 2014) shall be part
of this method statement. Prior and during the execution, basic safety precautions
shall be implemented to work efficiently and to prevent any accident or casualty.
12. Environmental control

“Environmental Control” shall be conforming to Approved Environmental Control
and Protection Plan (Reference to letter (Ref.No. STCJV/20140606-1) dated 6th
June, 2014) shall be part of this method statement.
If any other problems occurred in the site, applicable counter measures or
prevention action shall be considered immediately and executed as soon as possible.
To make the drainage ditch for collecting water into a batch basin for settlement
before pump out. Pump will be installed for dewatering in order to keep dry
construction area.
Water will be discharged to public irrigation system after settlement at a catch basin.
All the machine will be operated slowly at the area near resident to prevent from
noise.

Machine oil will be collected properly and be disposed to approved area.

8


Lach Huyen Infrastructure Construction Project (Road and Bridge Portion)

Appendix No.1
TRIAL COMPACTION LOCATION

10
10

Contract Package No.6