METHOD STATEMENT FOR TEST PILLING WORK (PREBORING PHC PILE)

METHOD STATEMENT FOR TEST PILLING WORK (PREBORING PHC PILE)_he purpose of this Method Statement is to describe the methodology for structural work of METHOD STATEMENT FOR TEST PILLING WORK (PREBORING PHC PILE) and to details out the steps to be taken in meeting the technical requirements of Van Phong 1 thermal power plant project

Trang 1

Page 1 of 15

(Pre-boring PHC Pile)

Document Type For Approval

Document No

VP1-0-L4-C-GEN-10017

Trang 2

& C (JIS A5373) to be provided

27 Mar 2020:

(1)Please add reference of approved calculation for required weld thickness AND test pile calculation

03/03/2020 (2) Quality control of cement grouting- tech specification and welding procedure has to be properly shown including MS

27 Mar 2020:

(2) Provide density cement slurry to check at site prior

to fill in the borehole

Provide estimated volume slurry for each pile and monitor the loss volume if happen

20/03/2020 (1) Design calculation for pile (Calculation for preliminary test pile VP1-0-L4-C-GEN-00020 was submitted and will be clarified separately

20/04/2020 (1) Test pile calculation VP1-0-L4-C-GEN-00020 is add in this MS as an attachment

20/03/2020 (2) Quality control of cement grouting- tech specification is updated in MS (item 10.1 Material and 11.4 Cement Milk Grouting) and welding procedure is updated in MS item 11.6 Pile connection)

20/04/2020 (2) Base on the technical specification of test piling work at item 2.2 Pile construction method, 2.2.1 Pre- boring with root hardening cement slurry (pile fixed slurry)

Compressive Strength 200 kg/cm2 Density cement slurry is 1.66

Tolerance : 1.66 +-5% (From 1.58 to 1.74) Volume slurry for pile D600 – 20m:

Cement (Ton) Water (lit) Cement milk (m3)

Volume slurry for pile D800 – 20m:

Cement (Ton) Water (lit) Cement milk (m3)

Monitor the volume on the mixing machine electric board

03/03/2020 01/04/2020

Trang 3

Page 3 of 15

03/03/2020 (3) Clarification for welding work measuring method (a) Welding quality of work

27 Mar 2020:

(3a) No WPS was shown

Welding rode is missing information

03/03/2020 (b) Checking/ application of anti corrosion for welding joints

27 Mar 2020:

(3b) Noted

03/03/2020 (c) Duration of welding joint temperature cooling time prior to pile driving

of this MS Rev.B 20/04/2020 a) WPS was attached in this MS at item 11.6.4 Welding rob will be added in the MS at Item 11.6.4

Welding quality to be controlled by Visual inspection, NDT MT test for welding shall be done In accordance with Welding inspection report of ITP

20/03/2020 b) Pile Welding joint shall be cover by Slurry Cement

20/03/2020 c) In order to prevent cracking of welding area, temperature cooling time will be min 1minute

20/04/2020 3c) In order to prevent cracking of welding area, temperature cooling time will be min 10minute

20/03/2020 (d) Noted, the length of the pile is determined by the boring log and pile bottom layer soil data

20/04/2020 (3d) To check the borehole depth, diameter/soil condition before installing the pile as below:

The length of drilling rod longer than the bore hole

Checking by mark a red line on the Drilling rod when get the design depth and using hydrometer to check

03/03/2020 01/04/2020

Trang 4

01/04/2020 Closed

20/03/2020 PRELIMINARY TEST PILE PLAN PLOT PLAN_ VP1- 0-L4-C-GEN-00021 was submitted and it is attached in

this document as Attachment #1 for reference

03/03/2020 01/04/2020

O

C

03/03/2020

- The purpose of Test Pile should be stated

- Number and location of test pile should be stated

- Kind of test must be stated

01/04/2020 Closed

20/03/2020 The purpose of Test Pile is added in MS

- Number and location of test pile : please refer to Attachment #1 VP1-0-L4-C-GEN-

00021_PRELIMINARY TEST PILE PLAN

- Kind of test : refer to item 1 Purpose of Test Pile

03/03/2020 01/04/2020

20/03/2020 Calendar date is applied on the top of Schedule 03/03/2020

01/04/2020

O

C

Capacity of equipment must be stated

Mobilization of testing equipment should be stated

01/04/2020 Closed

20/03/2020 Capacity of equipment is added in page 5 in MS (item

8 Mobilize plan of construction heavy equipment)

Mobilization of testing equipment in page 5 in MS (item 9 Mobilize plan of construction heavy

equipment)

03/03/2020 01/04/2020

O

C

03/03/2020 Raw material?

Not agree, please share the propose mix design if it will effect to the pile bearing calculation

01/04/2020 Closed

20/03/2020 Raw material will be submitted separate with MS The propose mix design will be submitted separate with MS

03/03/2020 01/04/2020

O

C

Trang 5

03/03/2020 01/04/2020

20/03/2020 Effective prestress is stated on page 9 (item 10.2 PHC Pile in MS)

03/03/2020 01/04/2020

O

C

250? Please check 01/04/2020 Closed

20/03/2020

It is 300

03/03/2020 01/04/2020

O

C

Concrete ? 01/04/2020 Closed

01/04/2020 Closed

20/03/2020 The slime at the bottom of borehole will be thrown out

of hole by the air compressor after completion of drilling

03/03/2020 01/04/2020

O

C

03/03/2020 This sentence is not clear

- How much is bearing capacity of pile? please clarify

- Please describe how to use this hammer?

01/04/2020 Closed

20/03/2020

- The capacity of PHC pile is 6281kN

- A pile is fixed to bearing layers by the drop hammer

03/03/2020 01/04/2020

O

C

Trang 6

(i) Pile design calculation report;

(ii) Design drawing of PHC Pile; welding joint;

(iii) Design length, design load of test piles?

(iv) Test piles location drawing?

01/04/2020 Closed

20/03/2020 Attachment documentation:

(i) Design calculation for pile (Calculation for preliminary test pile VP1-0-L4-C-GEN-00020 was submitted and will be clarified separately

(ii) Design drawing of PHC Pile; Attachment #2 Drawing of PHC-D800 and PHC-D600

(iii) & (iv) VP1-0-L4-C-GEN-00021_PRELIMINARY TEST PILE PLAN was submitted and it is attached in this document

as Attachment #1 for reference

03/03/2020 01/04/2020

O

C

03/03/2020 Auger should be in the slurry during injection of grout ?

01/04/2020 Closed

20/03/2020 Auger will not be in the slurry during injection of grout

03/03/2020 01/04/2020

20/03/2020 Borehole will be kept as vertical during drilling by total station

01/04/2020 Closed

20/03/2020 Need to fill the cement milk after insert PHC pile if the Cement Slurry deposit after insert pile 03/03/2020

20/03/2020 The hardening time cement According to mechanical target of Cement PCB40 of Nghi Son using at site

03/03/2020 01/04/2020

O

C

03/03/2020 Please explain:

(i) How to collect water and cement grout during install the pile?

(ii) How to control quality of cement grout to avoid mixing with ground water inside the bore hole?

(iii) How to fix top of pile after finish installation? How to check vertical tolerance of pile is acceptable?

01/04/2020 Closed

20/03/2020 Please explain:

(i) In order to collect water and cement grout during install the pile shall be create a bend hole near the pile to collect Cement Slurry and move to other place

(ii) When Cement Milk over flow on the ground, Ground water inside the borehole will be pushed out with gravitation of Cement Milk due to gravitation of Cement Milk heavier than ground water

(iii) Using light blow driving pile head until fix to the ground and then using two direct which have been located at the near distance to check vertical of pile head

Vertical tolerance of pile will be applied in TCVN 10667 at page 18 item 9.2.8 indicated the vertical tolerance is 1% of pile length are accepted

03/03/2020 01/04/2020

O

C

Trang 7

- WPS for welding joint

- Welding work and inspection shall be in accordance with the Welding inspection report on ITP for this test piling work

- Each layer welding work shall be done continuously without standby and cooling time

- NDT- MT test 5% for the joint will be applied to ITP

03/03/2020 01/04/2020

20/03/2020 The bottom pile will be fixed by wood and checked by

level when welding joint with the upper pile

03/03/2020 01/04/2020

O

C

Light blow is how much? Is it equal how many tons?

How weight of the ram?

01/04/2020 Closed

20/03/2020 The Light blow will be used to fix the pile get the required elevation with the weight from 2.5T – 3.7T

Light blows is around 10 blows/time for this test piling work The standard of Light blow(hammering height, rebound) for mass piling work shall be decided by this test piling work

03/03/2020 01/04/2020

The casing is applied for proper depth to prevent the collapsing of the soft and loose soil/sand layer of the hole

03/03/2020 01/04/2020

O

03/03/2020 Before setting of counterweight, the area of loading should be well compacted to avoid overload on the ground surface or incident during test

01/04/2020 Closed

Trang 8

1 Pile contractor, boring log near the test pile

2 Pile installing equipment

3 Test pile size, length, effective prestress etc

4 Recommend the ultimate load

20/03/2020 Noted and modified 20/04/2020

In accordance with form of Laboratory the content on testing report always fully this information Refer to

VP1-MS for Pre-boring PHC pile Rev B update

03/03/2020 01/04/2020

20/03/2020 Calibration of testing equipment shall be submitted as well

03/03/2020 01/04/2020

O

C

29 Page 13

03/03/2020 Please provide:

O

C

30 Page 13

03/03/2020 Lack of 1st cycle application of loads equal to 25, 50,

75, 100% of the pile design load

01/04/2020 Closed

20/03/2020 Additional 1st cycle application 03/03/2020

01/04/2020

O

C

Trang 9

01/04/2020 Closed

20/03/2020 According to the contract “Part III-2 Exibit B1 tech spec section 4.1”, ASTM is also usable standard for VP1 PJT

In particular, the ASTM related to the test pile is widely used internationally therefore there is no problem in application

Furthermore, the applied design capacity of the pile is lower than the allowable pile bearing capacity by calculation, so a sufficient result can be obtained with

a 200% test load recommended by ASTM

03/03/2020 01/04/2020

O

C

32 Page 13

03/03/2020 How much compressive force is 200% of ? 01/04/2020

Closed

20/03/2020 The allowable compressive pile bearing capacities are

as following and the capacities are based on the calculation report

PHC Allowable pile

bearing capacity

by calculation

Applied design capacity

Test load (200%)

- For pile head displacements of greater than 10 mm, each load increment shall be maintained until the rate of settlement is reducing and is ≤0.2 mm/hour

01/04/2020 Closed

20/03/2020

- For pile head displacements of less than 10 mm, each load increment shall be maintained until the rate

of settlement is reducing and is ≤0.1mm/hour

- For pile head displacements of greater than 10 mm, each load increment shall be maintained until the rate

of settlement is reducing and is ≤0.2 mm/hour

03/03/2020 01/04/2020

O

C

Trang 10

01/04/2020 Closed

20/03/2020 Allowance settlement of each load value is over 15%

D

03/03/2020 01/04/2020

O

C

Trang 11

01/04/2020

As for bearing capacity of pile, allowable bearing capacity has safety factor 2.5 for Compression and 3.0 for Tension to Ultimate Why the safety factor is different is Ultimate tensile capacity has more unknown factors than Ultimate Compressive capacity

Therefore, 200% x 3.0/2.5 = 240% is recommended, otherwise ASTM specify 200% for Tension test

Considering chimney foundation, tensile force of pile may be important and critical.

20/03/2020 According to the contract “Part III-2 Exibit B1 tech spec section 4.1”, ASTM is also usable standard for VP1 PJT

In particular, the ASTM related to the test pile is widely used internationally therefore there is no problem in application

Technically, the relationship between the safety factor

of the pile bearing capacity and the test load is different, so there is no problem in testing by applying

a 200% load according to ASTM

20/04/2020

The tensile pile capacity was selected smaller capacity between the pile bearing capacity considering the soil condition and the structural capacity of the pile as below

Tensile pile capacity of PHC D600 (Open Coal Storage yard) from calculation for preliminary test pile(VP1-0-L4-C-GEN-00020)

TCXD TCVN Struct

ural capaci

ty

Min, Capacit

y (TCXD, TCVN, Structur al)

Selecte

d design capacit

y

Test load

It is reasonable to apply a test load of 200% according

to the ASTM standards mentioned in the contract

03/03/2020 01/04/2020

O

O Closed

Trang 12

In accordance with ASTM D3689, the test result shall

be supplied for each Compression test, Lateral and tensile load test after each testing finish

03/03/2020 01/04/2020

01/04/2020

Closed

20/03/2020 This method will be carried out before test

03/03/2020 01/04/2020

PHC Allowable pile

bearing capacity

by calculation

Applied design capacity

Test load (200%) D600 227kN

(BHO-08, BH-45)

220kN 440kN D800 409kN (BH-31) 400kN 800kN

03/03/2020 01/04/2020

Trang 13

- Recommend to do the PDA test before static load test

if it is design on one pile

- The axial bearing capacity result of high strain dynamic test should be compared with the result of static load test to confirm the pile length

20/03/2020 The PDA test only test when Static load test was failed

in order to compare with the result of static load test

20/04/2020 The PDA test will carried out after get the test result of Static load test in order to compare with the result of static load test to confirm the pile length

The PDA test could not test before the static load test because the pile head might be broken when testing PDA by hammer

03/03/2020 01/04/2020

20/03/2020 The desired ultimate capacity base on wave & stress measured at the pile tip using the CASE method and CAPWAP Software

03/03/2020 01/04/2020

20/03/2020 Supplement the Test Principle before Test Procedure shall be applied

03/03/2020 01/04/2020

provided?

20/03/2020 Ground condition should be hard or using steel plate where the crane placement

20/04/2020 When the crane moving or standby to loading or unloading concrete block or heavy equipment, should

be used four steel plate

03/03/2020 01/04/2020

O

O Closed

Closed

Trang 14

20/03/2020 The interpreting and Analyzing Meassured Data will be submitted after finish testing

03/03/2020 01/04/2020

O

C

48 Page 26 03/03/2020

Unauthorized people ? 01/04/2020

The light for small working area with 30 lux to 80 lux

03/03/2020 01/04/2020

O

50 Page 26

03/03/2020 Please describe approved dump yard area, the license should be attached

01/04/2020

50 OPEN This information shall be reflected in this document for site implementation and provide the clues for review

20/03/2020 Dump yard area where the place had been permitted and licensed

20/04/2020 The disposal soil will be move to dump yard area which permitted by Owner or move disposal soil out site where it had licensed and approved by Owner

03/03/2020 01/04/2020

20/03/2020 With fuel leakage/spill need to using rag to clean or if fuel leakage to ground should be used shovel move it

to trash can

20/04/2020 With fuel leakage/spill need to using a tray to contain

If fuel leakage full in tray,it will be moved to oil can and the third party who have licensed to move this oil used out site

03/03/2020 01/04/2020

Trang 15

as "facial shield" for welder

01/04/2020 Closed

20/03/2020 Other PPE is provided if necessary

03/03/2020 01/04/2020

O

C

54 Page 27

03/03/2020

1 This job safety analysis and it is not risk assessment,

It is recommended that EPC shall prepare the risk assessment pertain to method statement

2 At least, following steps shall be described in the risk assessment: Mobilization of equipment, material - unloading - essential of equipment (drilling machine, mixing station, temporary electric) - moving and setting drilling machine at drilling point with steel plate - drilling and excavating including splicing - mixing and pumping slurry - lifting and inserting the PHC pile - moving, lifting and setting the counterweight - execution of load test - dismantle and the load test system -

demobilization - any other complement activities

3 It seem that there is no EPC's HSE team review on this document It is recommended that EPC's HSE team have to review this kind of document before sending out

01/04/2020

54 OPEN the risk assessment in this MS did not follow VP1-C-L4-H-GEN-00003 HSE Risk Management procedure If someone from L4's HSE team has review this document before sending it mean he has no expertise

20/03/2020 Risk assessment is updated in the document

20/04/2020 The risk assessment for this MS follow HSE Risk Management procedure will be attached in attachment

#3

03/03/2020 01/04/2020

Trang 16

1 | P a g e

METHOD STATEMENT FOR TEST PILLING WORK (Pre-boring PHC Pile)

EPC

Doosan Heavy Industries and Construction

EPC DOCUMENT No

APPROVED WITH COMMENT AC

Contractor to revise the correction and resubmit

Revise the correction and resubmit before proceeding

Information acknowledged with no comment

REVIEWED WITH COMMENT RC

Information acknowledged with comments Note: Approval or comment does not relieve the Contractor of

Trang 17

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

8 MOBILIZATION PLAN OF WORKFORCE 6/56

9 MOBILIZATION PLAN OF CONSTRUCTION HEAVY EQUIPMENT 7/56

10 MATERIAL 7/56

11 CONSTRUCTION METHOD 8/56

12 STATIC LOAD TEST 36/56

13 TENSILE LOAD TEST 42/56

14 HORIZONTAL STATIC COMPRESSION TEST 46/56

15 HIGH STRAIN DYNAMIC LOAD TEST 50/56

16 QUALITY CONTROL 52/56

17 ENVIRONMENT, HEALTH AND SAFETY 53/56

18 ATTACHMENT 54/56

Trang 18

3 | P a g e

1 PREFACE

Herewith we submit this method statement that describes implementation plan for the test

pilling work DHI intends to execute this working a safe, reliable condition achieving best

quality of construction

 Project Van Phong 1 BOT Thermal Power Plant

 Company/Owner Van Phong Power company limited(VPCL)

 Contractor DHI

2 Application

Application of this Method Statement is limited to the scope of test piling of Pre-boring

PHC piling works

3 Purpose of test pile:

Determine the characteristic value of the pile and provide test parameters for engineering pile foundation

a The compressive and lateral load test measures the vertical and lateral deformation of the deep foundation

b The tension (uplift) load test is performed to determine axial tensile (uplift) load capabilities of piles

c The Dynamic load testing is used to provide data on strain, force, acceleration, velocity, and displacement of a pile under an axially applied impact force

4 Scope of work:

The scope of test piling work is the static load tests and dynamic load test which is conducted for one PHC D800 type B pile and two PHC D600 Type A Detail location is shown on the Attachment #1 VP1-0-L4-C-GEN-00021 PRELIMINERY TEST PILE PLAN PLOT PLAN for reference Test pile location shall be complied with VP1-0-L4-C-GEN-00021

[Table : List of test pile]

Pile Diameter Quantity of

test pile

Location Kind of testing pile D800 – Class B 3 Chimney Vertical, Lateral and Uplift load test D600 – Class A 3 Coal Storage Vertical, Lateral and Uplift load test D600 – Class A 3 Water Treatment Vertical, Lateral and Uplift load test

Trang 19

4 | P a g e

The pile PHC D600 Type A and D800 Type B for production pile is shown on the Attachment

#2 Drawing of PHC-D800 and PHC-D600

5 REFERENCE

a JIS A5373-2010 “Pre-stressed Spun Concrete Piles (PHC pile)”

b TCVN 7888-2014 Pre-tensioned spun concrete pile

c TCVN 10667-2014 Spun concrete pile – Pile drilling and Installing – Construction and acceptance

d TCVN 9393-2012 Piles – Standard test method in situ for piles under axial

h ASTM D 3699 - “Standard test method for Deep Foundations under Lateral Load”

i ASTM D 4945 - “Standard Test Method for Pile under PDA/DLT”

Trang 20

5 | P a g e

6 Schedule

Trang 21

6 | P a g e

7 Site organization

8 MOBILIZATION PLAN OF WORK FORCE

MOBILIZATION PLAN OF CONSTRUCTION HEAVY EQUIPMENT

Heavy Equipment Number Capacity Remarks

Trang 22

7 | P a g e

9 MOBILIZATION PLAN OF TESTING EQUIPMENT

Testing Equipment Number Manufacture Remarks

Displacement Transducers 01 USA

Mixing & Strength Test

- Compressive strength test should be carried out at laboratory & site (R28>=20Mpa)

- During mixing, the concrete temperature should be managed constantly

- Mix design and raw material for pile D600A, pile length 20m and Drilling holes diameter D700

Trang 23

8 | P a g e

10.2 PHC Pile

Piles shall be manufactured in accordance with JIS A 5373

(or equivalent Vietnamese code)

No Diameter (mm) Class Effective Pre- stress

(N/mm2)

Thickness (mm)

Compressive Strength of Concrete (N/mm2)

Allowable Axial Force (tonf)

11 CONSTRUCTION METHOD

11.1 Description

Using Auger Drill Machine, a pre-drilled hole is obtained where hardening cement slurry

is filled to harden the root soil at the pile tip PHC (Pre-tensioned High strength Concrete) precast piles that are manufactured at the shop are to be inserted inside the hole Pile

fixing slurry is filled into the gap in order to enhance friction force between pile and the surrounding soils Several light blows on the pile head should be subsequently conducted

in order to secure the bearing layer at the pile tip elevation

11.2 Working Procedure

a Drill to the design depth with spiral auger, the diameter of borehole shall be 10cm larger than PHC pile diameter

The slime at the bottom of bore hole could not be treated after completion of drilling

b Pull up earth auger, remove some soil cutting, injecting root–hardening cement slurry through hollow drilling rod with proper pressure after drilling to predetermined depth

c Pull out the earth auger completely, inserting the PHC pile into borehole with its own

Trang 24

9 | P a g e

f Auger could not be in the slurry during injection of grout The auger will withdraw when pump slurry into hole

11.3 Excavating soil with air compressor

a Excavating soil from the ground to designed depth by drilling with air compressor

b During construction, the excavating soil shall be collected by excavator

c Borehole will be kept as vertical during drilling

11.4 Cement Milk Grouting

Before and after pile-inserting into the hole, hardening cement milk grouting shall be filled respectively After excavation reach to the designed depth, the cement milk grouting shall

be injected into the borehole Cement milk grouting will be mixed at mixing machine

based on approved mix design Root milk grouting goes through drilling rod to bottom of

drilled hole with designed volume Fixed milk grouting to be pumped from top of

borehole after inserting pile will be filled in the gap between pile and wall of hole due to

cement will be deposited after one day Cement milk grouting take a role in strengthening bearing capacity at pile tip and recovering & rebounding side friction of pile

Cement milk grouting should be complied with requirement of JRA code The time for

slurry to get hard is approximately 2 ÷ 4 hours (According to mechanical target of Cement PCB40 of Nghi Son using at site)

[Excavating Soil to Designed Depth

By Double Auger Machine]

te Drilling

Trang 25

10 | P a g e

11.5 Installing pile

a After the filling up cement milk grouting is completed, the PHC pile shall be installed immediately into the borehole to the designed depth

b Pile shall be settled slowly by service crane

c Two perpendicular vertical directions will be controlled by mean of plumb-line and theodolites to adjust position and direction of piles The verticality of pile shall be observed by the theodolites

d Before installing the pile, the ground shall be made evenly The flat working ground shall minimize the displacement of pile

[Installing pile by crane and pile is fixed to the bearing capacity layer by light hammering]

e After installing pile, the Cement Milk will over flow on the ground, at that time the Cement Milk will flow to the gutter had been excavated

f When Cement Milk over flow on the ground, Ground water inside the borehole will

be pushed out with gravitation of Cement Milk due to graviation of Cement Milk heavier than ground water

g Using light blow driving pile head until fix to the ground and then using two direct which have been located at the near distance to check vertical of pile head

h Vertical tolerance of pile will be applied in TCVN 10667 at page 18 item 9.2.8

indicated the vertical tolerance is 1% of pile length are accepted

Trang 26

11 | P a g e

11.6 Pile connection

11.6.1 Welding equipment:

11.6.2 Welding the joint:

- All welding joints shall be carried out by skilled worker who has welding certificate, under carefully supervise about thickness, quality, as well as the verticality of two pile segments before and after welding

- The welding joint shall be filling-up all around the gap between two pile segments (bevel angle) by 3 layers welding

- Welding work shall be only started to meet the following conditions:

The axis of pile segment shall be corrected at least two direction

C

Trang 27

12 | P a g e

 The axis of second pile segment coincides with the axis of first pile segment

 Surfaces of two pile head tightly contact together

11.6.3 Welding material:

- The welding rod or wire shall be kept in dry before use

- Welding surface shall be cleared of any grease, dust, rust or other unsuitable material, and shall be in dry condition

(See attach Welding Material Cert)

C

Trang 28

13 | P a g e

C

Trang 29

14 | P a g e

C

Trang 30

15 | P a g e

C

Trang 31

16 | P a g e

C

Trang 32

17 | P a g e

C

Trang 33

Trang 34

19 | P a g e

- Check the welding equipments, working condition: electric current, machines, welding equipments (electricity cables, welding cables, joints… )

- The crane is going to keep upper pile within welding process

- Start welding: The pile diameter is divided into two part, each welder is in charge of welding a part In order to ensure that the temperature shall not increase suddenly, the two welder shall start welding in opposite position rather than in the same position, they also need to follow the same direction during welding Moreover, the welder should also welding the pile connection by 3 layers so that the welding height can meet the specifications

- Welding process shall be following Phan Vu PHANVU-GMAW-01-R1 and PHANVU-PQR-01

WPS-(See Attachment WPS, PQR, Weleder Cert.)

C

Trang 35

20 | P a g e

C

Trang 36

21 | P a g e

C

Trang 37

22 | P a g e

C

Trang 38

23 | P a g e

C

Trang 39

24 | P a g e

C

Trang 40

25 | P a g e

11.6.5 Checking quanlity of welding joint:

- The welding join to be Visual inspection by Filed QC inspector

- Non-Destructive Testing (NDT) to be performed by Menagetic Test Method with 5% of total pile connection joint This work shall be done by Authority thirt party

(See attachment NDT-MT procedure)

C

Tiêu đề	Method Statement For Test Pilling Work (Pre-boring PHC Pile)
Tác giả	YJ Lee
Trường học	Van Phong 1 BOT Thermal Power Plant Project
Thể loại	For Approval
Năm xuất bản	2020

Định dạng
Số trang	131
Dung lượng	28,46 MB