The purpose of this Method Statement is to describe the methodology for structural work of 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.
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Project Title Van Phong 1 BOT Thermal Power Plant Project
Document Title METHOD STATEMENT FOR PERMANENT PILLING
No Section/
Page
Date
Status O/C * Remarks
1 4 h Approved MS xxx? for test pile to be listed MS of test pile is added 02/06/2020 O
2 5 Considering the piling procedure is a common and
single activity, Lot-4 is requested to share the work plan for each specific structure when the piling work to be carried out in different condition
of ground level
Chimney area the working plan was mention in VP1-O-L4-C-UHN-10054 Working plan of excavation works for Chimney
For the other area piling working plan will be done at the current ground level (G.L EL+6.1m)
02/06/2020 O
3 9 - Add work sequence diagram including work
place preparation, surveying, soil and pile head disposal
- Casing will not be used?
Site preparation and survey work procedure is described Soil handling is described in 7.4 Excavating soil and the cutting pile head to be disposed by waste treatment company
The casing is applied for proper depth to prevent the collapsing of the soft and loose soil/sand layer of the hole
02/06/2020 O
Noted
Closed
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The auger can be lower than the cement milk level from 0.5m~1m (in case have underground water in the borehole to avoid mix grout with water)
02/06/2020 O
5 13 Clarify code/standard for this requirement The frequency of MT test will be clarified and
described in ITP for permanent piling work
02/06/2020 O
6 15 Testing for lateral and tension forces need to be
added as required by PIII-2 Exh B1 8.8.2
Design loading capacity of piles had been verified pursuant to Clause 8.8.2 [Technical specification] Corresponding plan had informed
to client through VP1-0-L4-C-GEN-00020 and the result of test reported though VP1-0-L4-GEN-
1005, 53&54 The working load will be verified
by PDA or compression test Contractor would like to verify the integrity of working pile using PDA
8 21 Please give the evaluation of PDA test compared
with static loading test before acceptance
We will make evaluation of PDA test compared with static loading test when get the results and report it in the final report
02/06/2020 O
9 21 Please clarify frequency of PDA test The frequency will be clarified and described in
ITP for permanent piling work
02/06/2020 O
10 22 Drop height of 2m and 2.5m are commonly
applied After PDA any test to determine integrity
of piles???
The drop height depend on the hammer which will be used The calcuation of drop height will be added in Rev.B During PDA test, the intergrity of test pile will be checked
The cited documents include lateral and tension tests, thus they they should be
included here as well
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11 3 of 20 Please detail how many steel plates should be
provided for the piling machine movement on the site to prevent overturning for subcontractor implementation
We will use 4 pieces steel plates that will be used
to spread on road to stabilize the auger machine and crane
Dimension 1500x600x15mm
02/06/2020 O
12 3 of 20 Open holes from all the piles which are driven
down are potential hazards and are the traps on the site it should be covered by stable steel nets
Please detail the countermeasure clearly against this hazards for site implementation
In case of the Open holes from all the piles which are driven down are potential hazards and are the traps on the site it should be covered by stable steel nets Contractors have fabricate steel nets (square wire mesh d10a150 and wider than hole diameter 20cm) to cover open hole and set up barricade with signage installed around the hole
02/06/2020 O
13 4 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
14 4 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
15 5 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
16 6 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
OPEN Please reflect it in the risk assessment for site implementation and provide the clue for review
OPEN Please reflect it in the risk assessment for site implementation and provide the clue for review
OPEN please refer to JSA for detail comments
OPEN please refer to JSA for detail comments
OPEN please refer to JSA for detail comments
OPEN please refer to JSA for detail comments
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17 7 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
18 8 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
19 9 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
20 10 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
21 11 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
22 12 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
23 13 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
OPEN please refer to JSA for detail comments
OPEN please refer to JSA for detail comments
OPEN please refer to JSA for detail comments
OPEN please refer to JSA for detail comments
OPEN please refer to JSA for detail comments
OPEN please refer to JSA for detail comments
OPEN please refer to JSA for detail comments
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24 14 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
25 16 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
26 17 of 20 Please prepare JSEA and submit pertaining to
this document for site implementation base on Doosan's VP1-C-L4-H-GEN-00003 B HSE Risk Management
Additional Notes (if any)
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ö
Approved
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
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This JSA for only crane operating, what about other risk residual in the risk assessment
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Trang 50This is not in line with Doosan risk assessment procedure (only residual risk at job task which exceed 6 need to be
supplement the JSA), please do intensive study Doosan
procedure for the compliance.
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