Method Statements for Test Pile of Access Trestle andCoal Unloading Jetty

Method Statements for Test Pile of Access Trestle andCoal Unloading Jetty_The purpose of this Method Statement is to describe the methodology for structural work of Method Statements for Test Pile of Access Trestle andCoal Unloading Jetty and to details out the steps to be taken in meeting the technical requirements of Van Phong 1 thermal power plant project

Page 1 of 31

Project Title Van Phong 1 BOT Thermal Power Plant Project

Document Title Method statements for test pile of Coal Unloading

Jetty

Document Type For Approval

No Section

/ Page

Date

Status O/C * Remarks

1 1 04/02/2020 The Contractor shall verify pile designs by installing

preliminary piles or by using permanent piles to:

• Review and check the pile lengths necessary to satisfy the Contractor’s design;

• Assess the skin friction and end bearing components of soil resistance;

• Calibrate pile dynamic testing against static test results;

• Calibrate pile dynamic driving formula against static test results, hammer types and settings and hammer energy delivered to the pile as obtained from

dynamic testing;

• Review the Contractor’s pile installation method

Those purpose of preliminary piles test shall be incorporated in this MS, and the report should clearly mentioned result of each above items

06/03/2020 Closed

26/02/2020 DHI confirmed that pile designs will be verify by preliminary pile

06/03/2020 Closed

26/02/2020

Page 3 of 31

3 1 04/02/2020 (1) Number of test piles, locations and theoretical

bearing capacity calculation to be provided

06/03/2020 (1) Noted

10/04/2020 (1) Cal for Prelim test pile Coal Unload Jetty&Access Trestle still not approved.

04/02/2020 (2) Item 3.2 manpower: Accuracy of test results are critical then Cvs/experiences and qualified certificate

of key persons be shown

(4) item 5.1: Provide reference for 100% and 200%

DWL And no tensile and lateral test carried out be subject to approval by the VPCL

(5) item IV Pile driving: pile driving stop criteria not clear Noted that refusal paper use for piling record should be applied to see the rebounce during final blows

06/03/2020 (2) Noted (4) Noted (5) Noted 04/02/2020 (6) Item 5.5.2: in case load reach to the maximum test load but total displacement still not reach to 10%

pile diameter, continue loading to be asked Please describe more

06/03/2020 (6) termination of loading: when load up to maximum test load but total displacement still not reach the ultimate 10% of pile diameter, it is recommended that to increase load to the failure to estimate actual

26/02/2020 (1) Number of test pile, locations and theoretical bearing capacity calculation is shown in

attachment 01, 02

29/04/2020 VP1-0-L4-C-UZR-05700 Calculation prelim TEST PILE, COAL UNLOADING JETTY AND ACCESS TRESTLE has been approved by 16 April

(2) Test will be done by laboratory staff whom has been got approved by document No VP1- MOC-003

(4) Reference for 100% and 200% DWL is shown in attachment 02 Testing pile work and due to TCVN 9393:2012

(5) This comment will be clearly by construction drawing and method for pile driving which will be submitted by separate document

(6) In case of load, DHI will be carried out following the ASTM D1143M

06/03/2020 10/04/2020

10/04/2020 (6) Noted and subject to approval of VPCL.

(7) This MS cannot used for site construction since there does not support information for quality control

of site welding for steel pile connection (if applied) as well as detail measurement of rebound value as per approved calculation.

31/03/2020 DHI has updated load up to 250% and revised

on this MS (rev c)

29/04/2020 Test pile material shall not weld at site Rebound measurement shall be conducted by total station machine/ leveling machine, Rebound record has been mention on ITP

Closed

26/02/2020 DHI has added the attachment to the MS Rev B 06/03/2020 C

Closed.

Page 5 of 31

5 2 04/02/2020 - Clarify the sequence of piling test: when will start

axial static test and PDA test? Which one is previous test?

- Based on result of Test, the Contractor propose the another formula (for example Hiley formular) or conventional pile refusal method to identify the pile bearing capacity without PDA test or axial static loading test that is important during mass piling work period This matter should incorporate in "Piling Criteria" document for review and approval before start driving permanent piles

06/03/2020 Closed 04/02/2020

- Axial static pile test should be performed for both of compression and tensile that depend on design (If pile foundation is under high horizontal force; it is also considered horizontal load test)

06/03/2020 Open:

Please provide more clear explanation and review Part III-2 Exhibit B1 Tech Spec Section 8, item 8.8.2 Piling

10/04/2020 Closed

- DHI will note this issue

26/02/2020

- According to calculation sheet what mention in attachment 02 the tension tests no need to carry out

02/04/2020 According to Section 9.8.4.6 of technical Specification about Pile testing where is describing the requirement for Marine work, and Contractor considered such requirement of contract

Page 6 of 31

04/02/2020

- Add the introduction of construction structure;

specially geology condition at pile test location;

- Pile test location is at opened sea; therefore, the working condition should be insisted clearly (wave, wind, current,) in order to ensure the high quality of test result and labour safety issues

06/03/2020 Closed

26/02/2020

- DHI has revised content of this MS, this comment will be clearly on pile driving method which will be submit in separate document

- DHI has revised content of this MS, this comment will be clearly on pile driving method which will be submit in separate document

6 3 04/02/2020 No horizontal load test for vertical pile and raking

pile?

06/03/2020 Not agree, attachment 2 show the calculation of reaction pile, not test pile

10/04/2020 Closed

26/02/2020 According to calculation sheet for testing pile what mention in attachment 02 the tension tests

no need to carry out 02/04/2020

In calculation structure for piling work, the displacement and bending moment of piles have

a limitation not exceed the allowable value, therefore the lateral load test for single pile is not necessary

Test scheme is explained in 05700_A_CALCULATION FOR PRELIMINARY PILE TEST

VP1-0-L4-C-UZR-06/03/2020 10/04/2020

O

C

7 3 04/02/2020 The Testing loads for test pile shall be in accordance

to maximum Pile bearing capacity in pile design

Contractor to submit Pile design calculation report 06/03/2020

Open, it is not the calculation of bearing capacity of test pile

10/04/2020 Closed, However the test load should be refer to document

no VP1-0-L4-C-UZR-05700 which pile load capacity calculated base on soil condition

26/02/2020 DHI has submitted the calculation (refer to attachment 02) which was mention pile bearing capacity

02/04/2020 Test load is determined based on calculation structure for Coal Unloading Jetty which mention

in document No VP1-0-L4-C-UZR-05001.

06/03/2020 10/04/2020 08/05/2020

O

C

C

Page 7 of 31

8 3 04/02/2020 Refer to related document for Access trestle and

Coal Unloading Jetty such as design calculation, drawing, method, MAR, third-party for Testing information,

06/03/2020 Closed

26/02/2020 DHI has revised and updated on MS Rev B (Section 1.6)

9 3 04/02/2020 - Add the standard TCVN 9393:2012 Pile – Standard

test method in situ for piles under axial compression load

- Add the standard TCVN 11321:2016 Pile high strain dynamic testing for reference

- Add the standard TCVN 9394:2012 Pile driving and static jacking works – Construction, check and acceptance for reference

- Add the standard TCVN 10304:2014Pile foundation – Specification for reference

- Add the standard TCVN 9245:2012 Steel pipe pile

- Add TCVN 10318: 2014 Steel pipe piles and steel pile sheet pile for port harbor – Specification for construction and acceptance;

- Add TCVN4253:2012 Hydraulic structures – Foundation of hydraulic projects – Design standard

- Add TCXD 88: 1982 Pile method of site testing 06/03/2020

Closed

26/02/2020 DHI has revised and updated on MS Rev B (Section 1.6)

Page 8 of 31

10 3 04/02/2020 Please clarify what is this equipment definition based

on Vietnam Maritime Code No 95/2015/QH13 and decree No 171/2016/ND-CP, are there any other specifications, standards, regulations for this equipment, please mention for our information and supervision? How to know structural platform with the hammer assembled fit with the barge? Are there any confirmation from authority?

06/03/2020

OPEN please clarify what is this equipment (Watercraft, floating warehouse, movable platform or floating dock) based on on Vietnam Maritime Code No 95/2015/QH13? How to know structural platform with the hammer assembled fit with the barge? Are there any confirmation from authority? Please reflect it detail in this document as it it an integral part for site implementation and supervision

10/04/2020 Closed

26/02/2020

In this case, DHI has got confirmed with Authority that all document relation with each equipment definition base on Vietnam Maritime require which mention on 95/2015/QH13 and decree No 171/2016/ND-CP

02/04/2020

Base on Vietnam Maritime Code No 95/2015/QH13, Equipment for piling work is movable platform.

structural platform with the hammer is shown in the verification certification of Phu Xuan 17 which is submitted when equipment is delivered

to the site.

06/03/2020 10/04/2020

O

C

11 3 04/02/2020 Please provide more detail equipment such as

leader length of piling barge, capacity of crane on barge

How about drilling machine, drilling barge?

06/03/2020 Closed

26/02/2020 Detail equipment shall be provided on certification when equipment’s are mobilized to the site

DHI has updated Drilling machine and barge to

MS Rev B (Section III)

26/02/2020

DHI will dispatch HSE to supervise this activity 06/03/2020 C

Page 9 of 31

14 4 04/02/2020 Basically, the number of test pile with exactly

location, estimated pile length, tip elevation, cut off elevation should be designed and calculation first

Base on the design and soil condition, the Contractor will propose pile driving method and testing procedure to verify the calculation and decide the final pile length

06/03/2020 Closed

26/02/2020 Well note, this comment will be mention clearly

on the design document

15 4 04/02/2020 Clarify recommended for use only “Driving method

by diesel hammer machine will be applied” for Access trestle, no use “Driving – drilling – driving method”? (In the Details of test pile-Page 8, Length

of Pile test for Access trestle (50m) is longer than Wharf (42m)

06/03/2020 Closed

26/02/2020 Well note, this comment will be clearly on method of pile driving which will be submitted on

separate document

16 4 04/02/2020 Any plan to prevent oil spread to the sea due to

diesel hammer is quitted challenge during pile driving for environmental issue?

06/03/2020 OPEN Please detail what document for information, please be noted that the oil can spread to the sea in the time of test pile work due to diesel hammer so the the oil spreading prevention must be submitted pertaining to this method statement,

This are also one part of mitigation environmental control, please do not separate out of this document

10/04/2020 Closed

26/02/2020 Well note, this comment will be clearly on method of pile driving which will be submitted on separate document

29/04/2020 DHI has revised and updated on MS Rev D – Attachment 6

02/04/2020 DHI has mention on MS rev C (section 6.2, please refer)

06/03/2020 10/04/2020

10/04/2020

O

O

C

26/02/2020 Pulling force not act on pile of Access trestle

02/04/2020 Please refer to calculation for Access Trestle

No VP1-0-L4-C-UZL-05002 which has been submitted to Owner in separate document.

06/03/2020 10/04/2020

O

C

04/02/2020 Please be noted that, according to "Part III-2 Exhibit B1 Tech Spec Section 9, item 9.8 Piling", one of purpose for installation preliminary piles is to review the Contractor's pile installation method In case the Contractor's proposed method is not suitable or fail, the Contractor shall propose other driving method for review and approval

06/03/2020 Closed

26/02/2020

19 4 04/02/2020 The Contractor shall keep complete and accurate

pile driving records in a standard format with all necessary information to verify the design calculation 06/03/2020

Closed

26/02/2020 DHI has noted, and this comment will be clearly

on method of pile driving which will be submitted

on separate document

20 5 04/02/2020 Is this for Access Trestle pile ?

06/03/2020 Closed

26/02/2020 This work for all pile which should be braced after first driving and this comment will be clearly

on method of pile driving which will be submitted

06/03/2020 Closed

26/02/2020 DHI has revised and updated on MS Rev B (Attachment 02)

Design and calculation of anchor pile is shown Attachment 02

23 5 04/02/2020 The Contractor to update all figure showing actual

pile test and anchor pile arrangement for clarity 06/03/2020

Closed

26/02/2020 DHI has revised and updated on MS Rev B (section 1.4)

24 5 04/02/2020 There is no step of assemble the steel pile into the

head of the hammer, please describe this step with safety countermeasure

06/03/2020 OPEN Please be noted that there is high risk step, it is not acceptable if there is no safety countermeasure for this step in test pile time

10/04/2020 Closed

26/02/2020 The step of assemble the steel pile into the head

of hammer is shown in MS for pilling work which will be submitted in separately document

02/04/2020 DHI has been revised in Attachment 03

06/03/2020 10/04/2020

O

C

25 5 04/02/2020 drilling barge/ equipment should be mentioned in

equipment list 06/03/2020 Closed

26/02/2020 DHI has revised and updated on MS Rev B (Section III)

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26 5 04/02/2020 How to make sure people working here are safe,

please describe detail this step and countermeasure

06/03/2020 OPEN VP1-0-L4-H-GEN-00003 is common document, its document request you to identify the risk and safety countermeasure for this task

06/03/2020 Closed

26/02/2020

In case of safety, DHI will be implement work following HSE detail manual for L4 via VP1-0- L4-H-GEN-00003 which has been submitted to Owner

02/04/2020

DHI has been updated in Attachment 03

06/03/2020 10/04/2020

O

C

27 6 04/02/2020 Contractor to proof that the selection of hammer

12.8t is suitable for such D1000 steel pile

Calculation should be submitted and attached in this

MS 06/03/2020 Closed

26/02/2020 The calculation for hammer is shown in attachment 02 Testing pile work and attachment

02

28 6 04/02/2020 How to bracing the test pile? If brace it to the anchor

pile, mean the anchor pile should be driven before?

please show the Bracing system and correct the sequence

06/03/2020 Closed

26/02/2020 This step will be conducted for mass pile and will

be clearly on MS for pile driving which will be submitted on separate document

26/02/2020 DHI has revised content of this method, this comment will be clear on pile driving method which will be submitted on separate document

DHI has revised content of this method, this comment will be clear on pile driving method which will be submitted on separate document

26/02/2020 DHI has revised content of this method, this comment will be clear on pile driving method which will be submitted on separate document

04/02/2020 Please show the method of cutting pile head, and how to do it on site

06/03/2020 Closed

26/02/2020 DHI has revised content of this method, this comment will be clear on pile driving method which will be submitted on separate document

32 7 04/02/2020 Number of piles to be tested: Contractor to clarify the

2 preliminary piles are test piles of both wharf and access bridge?

According to TCVN 10304-2014 Pile Foundation – Design Standard, number of test pile is about 1% of total pile, but not less than 2

According the Clause 3.6-TCVN9393:2012Pile – Standard test method in situ for piles under axial compression load, number of pile test is normally equal 1% total number of pile of jetty but no less than

2 piles

Beside, because of long structure of wharf and access bridge with much variation of soil data, the number of test pile must be increased Contractor to recheck

06/03/2020 Open Please show the total number of jetty’s pile and total number of access bridge’s pile; and explain that why there

is only 1 testing pile for jetty and 1 testing pile for access bridge And how shall the preliminary piles test result be applied for estimation of mass pile?

10/04/2020 Closed

26/02/2020 Number of piles to be tested is shown in attachment 02 Testing pile work

02/04/2020

According to detail design Rev A for Coal Unloading Jetty Total number of jetty’s pile is 317 piles and total number of access trestle’s pile is 201 piles

According to Section 9.8.4.6 of technical Specification about Pile testing where is describing the requirement for Marine work, and Contractor considered such requirement of contract

06/03/2020 10/04/2020

O

C

26/02/2020 DHI has corrected and revised on MS Rev B (Section 4.1)

34 7 04/02/2020 Stage loading?

06/03/2020 Closed

26/02/2020 DHI has corrected and revised on MS Rev B (Section 4.1)

04/02/2020 Number of testing pile and testing pile location should be distinguished between jetty and access trestle;

06/03/2020 Closed

26/02/2020 DHI has revised and updated on MS Rev B

(Section 1.4)

36 7 04/02/2020 What is this ?

06/03/2020 Closed

26/02/2020 DHI has corrected and revised on MS Rev B

(Section 4.1)

37 7 04/02/2020 Clarify Design Working Load (for the Wharf and

Access trestle) 06/03/2020 Open Please clarify Design Load (4830 kN, 4050 kN in section 1.3, page 3)

10/04/2020 Closed

26/02/2020 Design working load (for wharf and access trestle) is shown in attachment 02 Testing pile work and due to TCVN 9393:2012

02/04/2020 DHI has revised and updated on calculation for preliminary test pile, coal unloading jetty and trestles VP1-0-L4-C-UZR-05700 (jetty is 4800kN, and trestle is 3500kN)

06/03/2020 10/04/2020

O

C

Page 15 of 31

38 7 04/02/2020 Pile test performed before mass piling work so the

testing load should be equal 250-300% design working load

06/03/2020 Open Please refer to Section 3.1, 3.2, 3.3 and 4.4.7 of TCVN 9393: 2012

10/04/2020 Closed

26/02/2020 According to TCVN 9393:2012, applied 250~300% design load for exploration pile With test pile is applied 150-200% design working load

02/04/2020 DHI has revised and updated on MS for test pile

of access trestle and coal unloading jetty Rev C (Testing load is equal 250% design working load)

06/03/2020 10/04/2020

O

C

39 7 04/02/2020 The Contractor to confirm that all compressive test

procedure is based on ASTM D1143M

06/03/2020 Closed

26/02/2020 DHI confirmed that all compressive test

procedure is based on ASTM D1143M

04/02/2020 Tension working force may be much more when Coal vessel berth abnormally, and then tension test should be needed

06/03/2020 Open Please check what is attachment 2

10/04/2020 Closed

26/02/2020 According to attachment 02, tension test no need to carry out

02/04/2020 Based on Calculation for preliminary test pile, Coal Unloading Jetty and access trestle No

VP1-0-L4-C-UZR-05700, the tension working force is too small (0kN with Trestle and 350kN with Jetty), smaller than Pulling Resistance of Pile (7226kN with Trestle and 1663kN & 2650kN with Jetty)

DHI has revised and updated Attachment 02

06/03/2020 10/04/2020

O

C

Page 16 of 31

41 7 04/02/2020 Clarify why tension test no need to carry out?

(Compression/tension and number of loading cycles are as specified in the SPERW)

06/03/2020 Open Add more explanation, no description in Appendix

02 Review Part III-2 Exhibit B1 Tech Spec Section

8, item 8.8.2 Piling

10/04/2020 Closed However Lot4 will be requested to carry out the tensile strength test if the calculation of reaction show enough internal tensile strength

26/02/2020 According to attachment

02/04/2020 Based on Calculation for preliminary test pile, Coal Unloading Jetty and access trestle No

VP1-0-L4-C-UZR-05700, the tension working force is too small (0kN with Trestle and 350kN with Jetty), smaller than Pulling Resistance of Pile (7226kN with Trestle and 1663kN & 2650kN with Jetty)

DHI has revised and updated Attachment 02 Also based on Section 9.8.4.6 of technical Specification about Pile testing where is describing the requirement for Marine work, and Contractor considered such requirement of contract

06/03/2020

10/04/2020 08/05/2020

O

C

C

Page 17 of 31

42 8 04/02/2020 - Contractor to correct the pile toe level of pile

(01-E-76) (+4.35-42.0m=-37.65m) and also carefully correct the “,” and “.” showing in pile head and toe level of pile 02-P40B

- Add the pile arrangement plan; and mark the position of 2 testing pile

- Clarify the co-ordinates of 2 testing piles (add the survey angular, longitude, projection zone besides of VN-2000 coordinate)

- Clarify that testing pile is 1 segment or 2 welded segments;

- Pile Diameter 1000/16mm is the outside diameter (or OD 1016mm)

- Propose to perform compression, tensile axial static load and horizontal load

06/03/2020 Closed

26/02/2020

- DHI has revised content of this method, this comment will be corrected on drawing design which will be submitted on separate document

- The pile arrangement plan is shown in Attachment 01

- DHI has updated on MS rev B (Section 1.4)

- Testing pile is 02 welded segments

- Pile Diameter 1000/16 is the outside diameter

- According to attachment 02, tension test no

need to carry out

43 8 04/02/2020 Position of test piles should be shown on drawing

Please bring this information to the top of document

06/03/2020 Closed

26/02/2020 DHI has revised and updated on MS Rev B

(Section 1.4)

44 8 04/02/2020 Clarify Type of Pile STK 490?

Why it differs material spec: SKK490 in document

no VP1-0-L4-Q-GEN-10009 06/03/2020

Open Please correct remark in ATTACHMENT 01, Page

#21 10/04/2020 Closed

26/02/2020 DHI has revised and updated on MS Rev B (Section V.5.2) SKK490 due to JIS A5525

02/04/2020 DHI has revised and updated on MS Rev C

26/02/2020

46 8 04/02/2020 No found in this MS

06/03/2020 Closed

26/02/2020

DHI has attached on MS rev B (Attachment 02) 06/03/2020 C

04/02/2020 Contractor to explain “Total loading of reaction system will be greater than 1012.8 tons”?

06/03/2020 Closed

26/02/2020 DHI has revised and updated on MS Rev B (Section V.5.3.2) and Refer to Attachment 2:

Calculation Sheet for testing pile

04/02/2020 Contractor shows 04 anchor piles shall be used, please note that number of anchor pile is calculated basing on testing load and its bearing capacity

Contractor to provide calculation sheet

06/03/2020 Closed

26/02/2020 DHI has revised and updated on MS Rev B

(Section 4.1) and Refer to Attachment 2

04/02/2020

- Tolerance of calibrated displacement transducers?

- Capacity of calibrated displacement transducer 06/03/2020

Provide the quantity table of reaction piles, reference pile in detail (specification, elevation, location, ) 06/03/2020

Closed

26/02/2020 DHI has revised and updated on MS Rev B

(Section 4.1)

26/02/2020 DHI has revised and updated on MS Rev B

(Section 1.4)

52 10 04/02/2020 - Add the figure of testing chart (including relevant

instrument and equipment: Beam and anchor piles,…);

- Notice that the distance between anchor pile, measurement equipment and testing pile must be longer than the allowable distance

- Clarify the requirement of equipment that regarding

to working pressure

06/03/2020 Closed

53 10 04/02/2020 - Mention clearly the value of 483T design bearing

capacity (compression or tensile, include or exclude safety factor)?

06/03/2020 Open Provide basis for reference, including: criteria design, design document of jetty and access bridge

10/04/2020 Closed

26/02/2020

It has mention on attachment 02, the value 483T design bearing capacity include safety factor

02/04/2020 DHI updated this information based on calculation for test pile, coal unloading jetty and access trestle No VP1-0-L4-C-UZR-05700 which has been submitted to Owner in separate document

in order to finalize this MS 06/03/2020

Closed

26/02/2020

26/02/2020

56 10 04/02/2020 The load/unloading interval and each requirement

must follow Section 8 Procedure – ASTM D1143M

Contractor to confirm

06/03/2020 Closed

26/02/2020 The load/unloading interval and each requirement will be followed Section 8

Procedure – ASTM D1143M

57 10 04/02/2020 Clarify the basis of increasing and reducing loading

level and its period?

06/03/2020 Closed

26/02/2020 The basic of increasing and reducing loading level and its period base on TCVN 9393:2012

and ASTM D1143M

58 11 04/02/2020 Time interval between pile installation and testing:

The piles shall be tested 7 days after installation 06/03/2020

Closed

26/02/2020 DHI confirmed that the piles shall be tested 7

days after installation

04/02/2020 How to control the displacement of beam (according

to TCVN 9393:2012, the displacement of beam is not higher than 1/200L);

06/03/2020 Closed

26/02/2020 Base on calculation for beam (Attachment 02), the displacement of beam is not higher than

26/02/2020 DHI has revised and updated on MS Rev B

(Section 4.1)

Page 21 of 31

61 11 04/02/2020 According to ASTM D1143M, The settlement of pile

beyond the limit of 15% diameter piles, the testing is terminated Contractor to check

06/03/2020 Closed

26/02/2020 DHI has revised and updated on MS Rev B

(Section 4.1)

62 12 04/02/2020 Make clear the waiting time of project: at least 7 days

in general (Page 12); at least 7 days for piles into clay layer and at least 3 days for piles into sand layer (Page 16)

06/03/2020 Closed

26/02/2020 DHI confirmed that the piles shall be tested 7 days after installation

04/02/2020 Remind (based on Specification):

The Contractor may select any Working Pile for dynamic load testing up to a total number of 2% of piles

06/03/2020 Open Provide basis for reference, including: criteria design, design document of jetty and access bridge

10/04/2020 Closed 04/02/2020 The results of static and dynamic load tests will be used to correlate pile driving sets calculated from pile driving formula, and to establish criteria for the remaining driving operations Subsequent dynamic tests may be used to adjust these criteria

06/03/2020 Closed

26/02/2020 Frequency of Dynamic load testing for mass pile will be followed specification’s project

02/04/2020 based on calculation for test pile, coal unloading jetty and access trestle No VP1-0-L4-C-UZR-

05700 which has been submitted to Owner in separate document

Page 22 of 31

64 13 04/02/2020 - Add “Impact Equipment”, according to the TCVN

11321:2016 Drop weights have a mass of at least 1% to 2% of the required load capacity of the pile

- Add “The tests shall be sufficient to mobilise the full pile resistance and cause a permanent net settlement of at least 2mm after one impact of the piling hammer”

06/03/2020 Closed

26/02/2020 DHI has revised and updated on MS Rev B

(Section 4.2)

65 14 04/02/2020 Chart?

06/03/2020 Closed

26/02/2020

DHI has corrected and deleted it on MS rev B 06/03/2020 C

66 17 04/02/2020 Provide organization chart of safety department and

responsibilities of each position for test pile 06/03/2020

Closed

26/02/2020 Organization chart of safety department is included with site organization chart which mention at Section II of MS rev B

67 18 04/02/2020 Is that enough?

06/03/2020 Closed

26/02/2020 DHI has revised and updated on MS Rev B

(Section 6.1.5)

Page 23 of 31

68 18 04/02/2020 Please describe how to manage environment

pollution during this activity (How to detail handling, storing, collecting, and treating of waste generation (including domestic, construction, and hazardous waste)

06/03/2020 Closed

04/02/2020 Please describe detail emergency response preparedness plan in this activity (Which is included emergency equipments )?

06/03/2020 Closed

26/02/2020 DHI will be conducted based on HSE detail manual for L4 via VP1-o-L4-H-GEN-00003 which has been submitted to Owner

26/02/2020 DHI has revised and updated on MS Rev B

26/02/2020 DHI will be conducted based on HSE detail manual for L4 via VP1-o-L4-H-GEN-00003 which has been submitted to Owner

Page 24 of 31

70 18 04/02/2020 1 Provide lifting plans as follows:

- What crane? Capacity?

- Load chart (Must be clearly marked)

- List of load (Pile )

- List of lifting gear (Capacity)

- Drawings showing the working radius and lifting area (Lifting from where to where)

- Tension force of wire rope according to the angle of lifting

- Inspection checklist for Crane and lifting gear

- List of manpower and their certificates

- Profile, 3rd party certification for crane and lifting gear

06/03/2020 Closed 04/02/2020

2 Emergency incident response flow chart and detailed communication network must be attached 06/03/2020

Closed

04/02/2020

3 Attach an emergency incident response plan (evacuation routes, boat to rescue, how to do if an incident occurs such as falling into water, cranes collapse )

06/03/2020 Closed

- Environmental risk assessment during the test piles

- List of facilities to prevent oil spills 06/03/2020

Closed

04/02/2020

5 JSA is too sketchy: Only use JSA for each specific step in pile testing work (For example, the first day you transport the pile to the construction site, Let's

do JSA and apply it to the transport work to ensure safety)

Please provide a risk assessment (Will be much clearer and more detailed): Initial control, consequences, likelihood -> Additional measures, the likelihood of occurrence has decreased? reduced

to what extent?

Each step must be taken and clearly indicated the risks of each job step, for example:

1 Transporting piles to the construction site

2 Lifting pile to the piling barge or stock barge and arrange pile

3 Fabrication work for working platform

4 Installation of working platforms

5 Lifting pile to the working platforms

Page 26 of 31

71 19 04/02/2020 1 Based on EPC contractor procedure, project

specification and regulation, this document shall be added risk assessment for this task (only JSA is not acceptable)

2 There is no assessment for the dismantle and demobilization

06/03/2020 Closed

#29,…) so we highly recommend that the site control should be paid more attention, increase safety supervisor, safety devices and carry out the work step by step No night working is recommended in this Pile Test period

10/04/2020 Closed

02/04/2020 Well note, the contractor shall pay more attention, increase safety supervisor, safety devices and carry out the work step by step

Due to standard testing process must be continuous so the contractor can’t stop testing at night time, it will be affected to the testing results

There will be no test procedure due to the operation of the equipment at night, and only minimal activity related to the test will be performed

06/03/2020 10/04/2020

- pile load capacity design or calculation

And please note that there is no method for pile driving, it will be submitted separately as the Contractor mention

10/04/2020 Closed

02/04/2020

- Reaction force analyzing due to Pile testing work No VP1-0-L4-C-UZR-05700

- Pile load capacity is in Attached 02

- Method for pile driving will be submitted in separate document,

06/03/2020

10/04/2020

O

C

Page 27 of 31

74 3 06/03/2020 - Use ‘’Recommendation’’ or ‘’Introduction’’ to

replace ‘’Introduce’’ (Name of section)?

- Add the Figure of Master Plan (including of Coal Unloading Jetty and Access trestle) + Wind Direction Chart

10/04/2020 Closed

02/04/2020 DHI has revised and updated on MS Rev C (Section I.1.1)

10/04/2020 Closed

02/04/2020 DHI has revised and updated on MS Rev C (Section I.1.3)

02/04/2020 DHI has revised and updated on MS Rev C

(Attachment 02)

06/03/2020 10/04/2020

02/04/2020 Based on calculation for test pile, coal unloading jetty and access trestle No VP1-0-L4-C-UZR-

05700 which has been submitted to Owner in separate document the maximum loads test shall be 250%xDesign Working Load

06/03/2020 10/04/2020

O

C

78 3 06/03/2020 Clarify the basis Design Criteria to calculate for

design working load: 4830KN and 4050KN to apply

in testing 10/04/2020 Closed

02/04/2020 Based on calculation for test pile, coal unloading jetty and access trestle No VP1-0-L4-C-UZR-

05700 which has been submitted to Owner in separate document (4800kN, 3500 kN in table 1- 2)

DHI has revised and updated on MS Rev C

10/04/2020 Noted

02/04/2020 Based on calculation for test pile, coal unloading jetty and access trestle the tension working force

is too small, smaller than the self-weight of SPP, the Tension load test is suggested to neglect.

06/03/2020 10/04/2020

08/05/2020

O

C

C

02/04/2020 Fresh time after pile driving is 7 days which is shown in section IV.4.1.3

02/04/2020 Reference pile is the pile to fix the Dial gauge 06/03/2020

10/04/2020 Open

It is unclear, please provide the detail drawing of reaction structure, joint between anchor pile and beam; and how percentage of counterweight from concrete block and from anchor pile?

02/04/2020

Please see Attachment 01 – Drawing of Static Pile load test and PDA test

29/04/2020

DHI has revised and updated on Attachment

01– Drawing of Static Pile load test and PDA test Percentage of counterweight from concrete

block (100%-1220T) and from anchor pile (20%

-if necessary) is shown in Bearing capacity of

anchor pile calculation in Attachment 02

08 reaction piles and 04 Reference piles) 10/04/2020

Closed

02/04/2020 DHI has revised and updated on MS Rev C (Section IV) There are 08 reaction piles and 04 Reference piles

06/03/2020

10/04/2020

O

C

84 17 06/03/2020 This is for reminder that you may misunderstand

what is job safety analysis

10/04/2020 Closed

10/04/2020 Closed

02/04/2020 DHI has revised and updated on MS Rev C (grade of steel pipe pile is SKK490)

10/04/2020 Closed

02/04/2020 DHI has revised and updated on MS Rev C (Section I.1.6)

06/03/2020 Clarify the “Assumed Load Bearing Capacity of Pile”

of 483T, 405T for Hammer calculation?

Clarify the “Assumed Load Bearing Capacity of Pile”

of 483T, 405T for Hammer calculation?

10/04/2020 Closed

02/04/2020 DHI has revised and updated on MS Rev C

06/03/2020

- Add the figure to describe the length of anchor pile (include of length under seabed and free length);

- Add the steel grade of anchored pile

- Add the checking of anchor pile section 10/04/2020

Closed

02/04/2020 The length of anchor pile (include of length under seabed and free length) is shown in Attachment 02

06/03/2020

10/04/2020

O

C

- Clarify the flexible length of Anchor pile?

- Internal force of anchored pile shall be used to check the capacity of section

10/04/2020 Closed

02/04/2020 The contractor calculated for beam system which is supported for counterweight so in model link between beam system and ground is anchored steel piles same as bearing point In this case internal force of beam system shall be bigger and it’s more safety for calculation

DHI has revised and updated calculation with updated Designed Verification Load on MS Rev

10/04/2020 Closed

02/04/2020 DHI has revised and updated on MS Rev C

Page 31 of 31

91 1 11/05/2020 DHI proposed Option 1 & 2 for Jetty structure on

27th April, 2020 which included raked pilea with large tension force This document including Static Load Test shall be revised.

DHI will not change document, it is including in static formula,

- No specification for tension test applied on preliminary pile as shown on 9.8.4.5 and 9.8.4.6 in Exhibit B1, Technical Specifications:

“A minimum number of two static compressive load tests shall be done in accordance with international standards and codes” is required only

- This comment has been verify on document

“CALCULATION FOR PRELIMINARY TEST PILE, COAL UNLOADING JETTY AND ACCESS TRESTLE” (VP1-0-L4-C-UZR-05700- Rev C) which has been approved by Owner

-It also has verified by site test pile (PDA and static load test) which determine the pile bearing capacity for both of compression and tensile Load (see document VP1-0-L4-Q-GEN-10043- Test Report For Offshore Piling Initial)

Additional Notes (if any)

* O - Open, C – Closed

Closed

P a g e | 1

METHOD STATEMENTS FOR TEST PILE OF ACCESS TRESTLE AND COAL UNLOADING JETTY EPC

Doosan Heavy Industries and Construction

EPC DOCUMENT No

Contractor to revise the correction and resubmit

Revise the correction and resubmit before proceeding

Information acknowledged with no comment

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

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

Table of Contents

I GENERAL 3

1.1 I NTRODUCTION 3 1.2 T HE P URPOSES OF THE TEST 3 1.3 S COPE OF WORK 4 1.4 L OCATION OF TEST PILE 4 1.5 T ESTING S EQUENCE 5 1.6 R EFERENCE 6

II SITE ORGANIZATION 7 III TESTING EQUIPMENT AND SCHEDULE 7

3.1 Schedule 7 3.2 Equipment and mobilize plan 8

IV TESTING METHOD 8

4.1 S TATIC PILE LOAD T EST 9

4.1.1 Introduction 9 4.1.2 Testing Equipment’s 9 4.1.3 Testing Step 10

4.2 H IGH S TRAIN P ILE D YNAMIC L OAD T EST (PDA) 13

4.2.1 Introduce 13 4.2.2 Objective, method and standard for the test 13 4.2.3 Testing Equipment’s 14 4.2.4 Test procedure 14 4.2.5 Test Report 15

V QUALITY CONTROL 15

VI HEALTH, SAFETY AND ENVIRONMENT 16

6.1 S ITE S ITUATION R ESPONSE AND E MERGENCY R ESPONSE 16

6.1.1 Site response 16 6.1.2 Emergency and contact information 17 6.1.3 Medical Emergency Response Plan 18 6.1.4 Personal Protection equipment (PPE) 19

6.2 J OB SAFETY ANALYSIS 19 6.3 R ISK A SSESSMENT 22

VII ATTACHMENT 22

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

The dimensions of 02 mooring dolphin are: LxBxH = (12x12x2) m; crest elevation: +6.50m; bottom elevation: -18.31m Structure of Mooring dolphin is the RC block on steel pipe pile D1000 system

The length of trestle is about 1150m with the width of trestle is 12m; from axis 44 to axis 48 the width of trestle is 17m Above the trestle is technological trench with the width is 5m and from axis 44 to axis 48 is 10m Structure of trestle is the RC beam and RC slab system on steel pipe pile D1000 system

Figure I-1 General view of access trestle and coal unloading jetty

1.2 The Purposes of the test

 Determine the characteristic value of the single pile vertical bearing force;

 Provide the dynamic force test parameters for the engineering pile by the high straining dynamic force test and comparison with the results of static load test;

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

No Description D (mm)

Steel grade

Length (m)

Thk (mm)

Q’ty (Pile)

Design load (KN)

Testing load (KN)

Table I-1 List of test pile

1.4 Location of test pile

Figure I-2 Location of test pile for Jetty

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

1.6 Reference

Technical documents:

Drawing:

 Drawings of Jetty: From VP1-0-L4-C-UZN-05104 to VP1-0-L4-C-UZN-05137

 Drawings of Trestle: From VP1-0-L4-C-UZN-05501 to VP1-0-L4-C-UZN-05526

Documents:

 Part III-2 Exhibit B1 Tech Spec Section 8, item 8.7 Steel work

 Part III-2 Exhibit B1 Tech Spec Section 8, item 8.8.2 Piling

 Part III-2 Exhibit B1 Tech Spec Section 9, item 9.8 Piling

 Design Criteria No VP1-0-L4-C-UXU-00002

Code and standard:

 Standard test method for high-strain dynamic testing of piles, ASTM D4945-00

 Standard Test Methods for Deep Foundations Under Static Axial Compressive Load, ASTM D1143

 Section B16 and Section B17: The specification for the piling works is the “UK Institution of Civil Engineers (ICE) Specification for Piling and Embedded Retaining Walls, Third Edition 2017, (SPERW)”

 Standard TCVN 9393:2012 Pile – Standard test method in situ for piles under axial compression load

 Standard TCVN 11321:2016 Pile high strain dynamic testing for reference

 Standard TCVN 9394:2012 Pile driving and static jacking works – Construction, check and acceptance for reference

 Standard TCVN 10304:2014 Pile foundation – Specification for reference

 Standard TCVN 9245:2012 Steel pipe pile

 Standard TCVN 10318: 2014 Steel pipe piles and steel pile sheet pile for port harbor – Specification for construction and acceptance;

 Standard TCVN 4253:2012 Hydraulic structures – Foundation of hydraulic projects – Design standard

 Standard TCXD 88: 1982 Pile method of site testing

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

II SITE ORGANIZATION

Figure II-1 Site organization chart

3.1 Schedule

Table III-1 Schedule of testing pile work

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

3.2 Equipment and mobilize plan

I Static Loat Test

2 Oil Pressure Pump + Pressure

Table III-2 Equipment Mobilization plan

Please find attachment 05 Detail of equipment’s for testing

IV TESTING METHOD

Static loading test by reaction Pile Method and concrete block load provides the relationship between loads - settlement of the pile to determine the axis bearing capacity of the pile working in the soil by using 08 anchor piles and 04 reference pile These 08 anchored piles shall be working piles of Platform

Piles are tested by the method loading each level up to maximum loading

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

Pile settlement is monitored by meter system setting at four positions on the head pile, matching symmetric through the pile center The meters are mounted on the stand independent to testing pile

LAS-XD236 is approved for carry out testing pile as document No VP1-MOC-003 (See

Attachment 04 – Certificate Eligible for construction specialized testing of LAS-XD236)

4.1.2 Testing Equipment’s

a Loading part

Hydraulic jack synchronization system consists of the specialized hydraulic, the total lifting capacity ensure larger than 150% largest testing load Hydraulic system is put on the head pile through the steel pad to ensure loading evenly on the head pile Center of Hydraulic system coincides with pile center

Pumping station is manufactured synchronization with Hydraulic system Pressure - meter type 70MPa or equivalent

All devices are on the certificate verification period effect

b Reaction System

The reaction system contains test beams, loading frames, anchor piles The loading frame is constructed by a system of cross beams The following reaction system will be used:

- 2 Longitudinal beam I600x200x11x17mm, length L = 12m

- Cross beam I800x300x14x26mm, length L = 12m

- Test beam I1300x550x30x85mm, length L = 12m

Refer to ‘Attachment 02: Calculation Sheet for test pile’

- 8 anchor piles without side diameter is 812.8mm;

- Total loading of reaction system will be greater than 1,1520 KN