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.
Comment Response Sheet (CRS) Project Title Van Phong BOT Thermal Power Plant Project Document Title METHOD STATEMENT FOR PERMANENT PILLING WORK [ON SHORE] Document Type For Approval Document No VP1-0-L4-C-GEN-10021 Returned Status NA Prepared by CRS No VP1-0-L4-C-GEN-10021-A-CRS CRS Issued Date 02/06/2020 Engineer Construction Remarks No Section/ Page Response to Comment Review Date Status O/C * h Approved MS xxx? for test pile to be listed MS of test pile is added 02/06/2020 O 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 02/06/2020 O Noted - 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 02/06/2020 O Closed Lot For the other area piling working plan will be done at the current ground level (G.L EL+6.1m) The casing is applied for proper depth to prevent the collapsing of the soft and loose soil/sand layer of the hole Page of Comment Response Sheet (CRS) - Please explain why the auger could not be in the slurry? - Recommend the auger inside grout milk from 0.5m~1m in case have underground water in the borehole to avoid mix grout with water Well noted and updated 02/06/2020 O Closed O 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) 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 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-GEN1005, 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 02/06/2020 15 Clarify frequency of test pile according to applied standard The frequency will be clarified and described in ITP for permanent piling work 02/06/2020 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 21 Please clarify frequency of PDA test The frequency will be clarified and described in ITP for permanent piling work 02/06/2020 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 02/06/2020 O The cited documents include lateral and tension tests, thus they they should be included here as well O Noted Please submit before apply O PDA for working piles Reply noted Noted O Closed O Page of Comment Response Sheet (CRS) 11 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 pieces steel plates that will be used to spread on road to stabilize the auger machine and crane OPEN Please reflect it in the risk 02/06/2020 O assessment for site implementation and provide the clue for review Dimension 1500x600x15mm 12 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 OPEN Please reflect it in the risk 02/06/2020 O assessment for site implementation and provide the clue for review 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 JSEA has been added in Rev.B 02/06/2020 O OPEN please refer to JSA for detail comments 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 JSEA has been added in Rev.B 02/06/2020 O OPEN please refer to JSA for detail comments 15 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 JSEA has been added in Rev.B 02/06/2020 O OPEN please refer to JSA for detail comments 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 JSEA has been added in Rev.B OPEN please refer to JSA for detail 02/06/2020 O comments Page of Comment Response Sheet (CRS) 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 JSEA has been added in Rev.B 02/06/2020 O OPEN please refer to JSA for detail comments 18 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 JSEA has been added in Rev.B 02/06/2020 O OPEN please refer to JSA for detail comments 19 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 JSEA has been added in Rev.B 02/06/2020 O OPEN please refer to JSA for detail comments 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 JSEA has been added in Rev.B 02/06/2020 O OPEN please refer to JSA for detail comments 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 JSEA has been added in Rev.B 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 JSEA has been added in Rev.B 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 JSEA has been added in Rev.B 23 13 of 20 OPEN please refer 02/06/2020 O to JSA for detail comments OPEN please refer 02/06/2020 O to JSA for detail comments 02/06/2020 O OPEN please refer to JSA for detail comments Page of Comment Response Sheet (CRS) 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 JSEA has been added in Rev.B 02/06/2020 O OPEN please refer to JSA for detail comments 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 JSEA has been added in Rev.B OPEN please refer 02/06/2020 O 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) * O - Open, C Closed JSEA has been added in Rev.B 26 17 of 20 to JSA for detail comments OPEN please refer to JSA for detail 02/06/2020 O comments Page of AP APPROVED Approved APPROVED WITH COMMENT AC Contractor to revise the correction and resubmit NOT APPROVED NA Revise the correction and resubmit before proceeding RE REVIEWED Information acknowledged with no comment REVIEWED WITH COMMENT RC Information acknowledged with comments Note: Approval or comment does not relieve the Contractor of all obligations covered under contract Discipline: Civil 07 Jul 20 Date: ö This JSA for only crane operating, what about other risk residual in the risk assessment Page 43 Page 44 This is not in line with Doosan risk assessment procedure (only residual risk at job task which exceed need to be supplement the JSA), please intensive study Doosan procedure for the compliance Page 45 Page 46 Page 47 Page 48