Borepile Work Procedure - MJPN-PGAS-3514-CV-PR-008 [PDF]

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PT. PERUSAHAAN GAS NEGARA (Persero) Tbk.



PT. Connusa Energindo



PT. PGAS SOLUTION



BOREPILE WORK PROCEDURE Document No.



Rev.



Date



MJPN-PGAS-3514-CV-PR-008



A



01/06/2015



Page 1 of 10



PT. Perusahaan Gas Negara (Persero) Tbk.



PELAKSANAAN KERJASAMA PENINGKATAN KEHANDALAN JARINGAN UNTUK PENYALURAN GAS WILAYAH PASURUAN MOJOKERTO



Contract No. 055600.PK/HK.02/PMO/2014



A REV



Issued For Review DESCRIPTION



01/06/2015



STR



AB



AGK



DATE



PREPARED



CHECKED



APPROVED



EMPLOYERS PERSONNEL



EMPLOYER



PT. PERUSAHAAN GAS NEGARA (Persero) Tbk.



PT. PGAS SOLUTION



PT. Connusa Energindo



BOREPILE WORK PROCEDURE Document No.



Rev.



Date



MJPN-PGAS-3514-CV-PR-008



A



01/06/2015



REVISION HISTORICAL SHEET Rev.



Date



Description



A



01-06-15



Issued For Review



Page 2 of 10



PT. PERUSAHAAN GAS NEGARA (Persero) Tbk.



PT. PGAS SOLUTION



PT. Connusa Energindo



BOREPILE WORK PROCEDURE Document No.



Rev.



Date



MJPN-PGAS-3514-CV-PR-008



A



01/06/2015



Page 3 of 10



CONTENTS 1.



INTRODUCTION ............................................................................................................... 4



2.



OBJECTIVE ...................................................................................................................... 4



3.



DEFINITIONS ................................................................................................................... 4



4.



CODES, STANDARDS AND SPECIFICATIONS ............................................................... 4



5.



MATERIALS ...................................................................................................................... 5



6.



BOREPILE SIZING ........................................................................................................... 5



7.



LIST OF EQUIPMENT ...................................................................................................... 5



8.



INSTALLATION OF PILE .................................................................................................. 6



9.



INSPECTION .................................................................................................................... 8



10.



TOLERANCE .................................................................................................................... 8



11.



ACCEPTANCE CRITERIA ................................................................................................ 9



ATTACHMENT : 1. JSA BORED PILE 2. FORM REPORT BORED PILE



PT. PERUSAHAAN GAS NEGARA (Persero) Tbk.



PT. PGAS SOLUTION



PT. Connusa Energindo



BOREPILE WORK PROCEDURE Document No.



Rev.



Date



MJPN-PGAS-3514-CV-PR-008



A



01/06/2015



Page 4 of 10



1. INTRODUCTION PT Perusahaan Gas Negara (Persero) Tbk., intends to execute the PENINGKATAN KEHANDALAN JARINGAN UNTUK PENYALURAN GAS WILAYAH PASURUAN MOJOKERTO PROJECT which is located at Japanan, Java Island.



2. OBJECTIVE The objective of this document is to determine the Borepile work procedure for Japanan Metering Station. This demand will be used as materials, transportation, storage, type of equipment used, material control, installation of pile pile splicing and pile driving. 3. DEFINITIONS EMPLOYER



PT. Perusahaan Gas Negara (Persero) Tbk. [“PGN”]



EMPLOYER’S



PT. Connusa Energindo



PERSONNEL CONTRACT



Peningkatan Kehandalan Jaringan Untuk Penyaluran gas Wilayah Pasuruan dan Mojokerto



PGAS SOLUTION



PT. PGAS Solution



SUBCONTRACTOR Subcontractor designated by PGAS Solution to perform part of work in the project



4. CODES, STANDARDS AND SPECIFICATIONS The material , fabrication, and testing shall be in accordance with the latest issue of the following codes and standard and the following EMPLOYER / EMPLOYER’S PERSONNEL specification, unless otherwise specified herein after. ASTM D 4945 Standard Test Method for High-Strain Dynamic Testing of Piles ANSI / AWS D1-1 Structural Welding Code – Steel, 2010 ASME Sect. IX Qualification Standard for Welding and Brazing Procedure, Welders, Brazers, and Welding and Brazing Operators JIS A 5335 Pre tensioned Spun Concrete Piles SSPC Steel Structure Painting Council ACI 301 Specifications for Structural Concrete ACI 543 Manufacturer’s Standard, if any ASTM D1143 Method of Testing Piles Under Static Axial Compressive Load ASTM D4945 Standard Test Method for High-Strain Dynamic Testing of Piles



PT. PERUSAHAAN GAS NEGARA (Persero) Tbk.



PT. PGAS SOLUTION



PT. Connusa Energindo



BOREPILE WORK PROCEDURE Document No.



Rev.



Date



MJPN-PGAS-3514-CV-PR-008



A



01/06/2015



Page 5 of 10



5. MATERIALS 5.1 Ready Mix Concrete Ready mixed concrete for bored pile shall use type-I + fly ash and have a minimum average of specified compressive strength, fc’ = 50 Mpa . The minimum slump of concrete shall be 12 cm and the maximum shall not exceed 16 cm, based on requirement of concreting devices and conform to specification for concrete work doc. No. MJPN-PGAS-3514-CV-SP-007. Unless otherwise specified or approved as, the maximum nominal size of aggregate shall not exceed 20 mm. SUBCONTRACTOR shall propose and provide mix proportion test for limits for EMPLOYER / EMPLOYER’S PERSONNEL approval prior executing the work. An additive of plasticizer and retarder type may be applied, composition of additive and retarder subject to approval. The concrete trial mix design shall be perform to achieve the concrete workability. 5.2 Reinforcing Steel Reinforcing steel bars shall conform to SNI 07-2052, 2002; BjTD 40 or equal to ASTM A 615 Grade 60 for diameter greater than 10 mm. Plain bar shall conform to SNI 07-2052, 2002; BjTP 24 or equal to ASTM A 615 Grade 40 for diameter 10 mm and below. Certified mill test report shall be submitted as requested by EMPLOYER. 6. BOREPILE SIZING Bore pile diameter, length and quantity shall be in accordance with engineering calculation.



7. LIST OF EQUIPMENT 7.1 Equipment shall be based on approved drilling method. PGAS SOLUTION shall propose drilling method for EMPLOYER / EMPLOYER’S PERSONNEL approval. 7.2 Drilling equipment and accessories, and other equipment shall be subject to inspection and approval by PGAS SOLUTION and EMPLOYER/ EMPLOYER’S PERSONNEL prior to mobilization



PT. PERUSAHAAN GAS NEGARA (Persero) Tbk.



PT. PGAS SOLUTION



PT. Connusa Energindo



BOREPILE WORK PROCEDURE Document No.



Rev.



Date



MJPN-PGAS-3514-CV-PR-008



A



01/06/2015



Page 6 of 10



7.3 List of minimum equipment which can be used for Bore Pile work are as follows : 1. Concrete pump 2. Concrete tremi/hose 3. Drill equipments (drill cross bit, pipe rod) 4. Spiral/auger cleaner (if needed) 5. Concrete bucket 6. Submersible pump



8. INSTALLATION OF PILE 8.1 Preparation and Finish Work 8.1.1



8.1.2



Setting Out Location of all piles shall be set out at the points designated on the engineering drawings. Pile Cut Off The pile head shall be cut off within ±100 mm (with ± 12 mm tolerance) from designed level as shown on the engineering drawings. A suitable means and tools, which subject to EMPLOYER/ EMPLOYER’S PERSONNEL approval, shall be used for cutting the piles in order to prevent the piles from damages during pile cutting. Extended rebar shall be provided as shown on the engineering drawing.



8.2 Drilling and Concreting Work 8.2.1



Drilling Work Unless the SUBCONTRACTOR has his own method and approved by PGAS SOLUTION and EMPLOYER/ EMPLOYER’S PERSONNEL as stated in section 7.1, the drilling work execution below shall be as follows: a. Prior to drilling work, in some area SUBCONTRACTOR shall perform existing concrete pavement demolishing. In some case, it should also including manual excavation down to 1.5 to 2.5 meters depth and pre-boring using auger with diameter less than 250 mm to check the underground pipes or cables position. During excavation, sloping and/or shoring may required to prevent soil colapses. b. Timber blocks and steel plates for equipment padding should be provided in order to avoid direct heavy load distribution towards underground pipes or cables, if any. c. Temporary fence should be provided at limited area of drilling work



PT. PERUSAHAAN GAS NEGARA (Persero) Tbk.



PT. PGAS SOLUTION



PT. Connusa Energindo



BOREPILE WORK PROCEDURE Document No.



Rev.



Date



MJPN-PGAS-3514-CV-PR-008



A



01/06/2015



Page 7 of 10



d. Temporary drainage shall be provided, the water mud from wash boring shall be drained to proper place. Sump pit shall be provided when required. e.



SUBCONTRACTOR shall drill the soil with standard auger and/or bucket.



f.



For the hard soil level, the auger or bucket shall be equipped with tungsten carbide teeth. In case the soil is too hard to drilled, the soil should be broken by chisel before employing the teeth auger or teeth bucket.



g. The tip of borehole shall be penetrated to soil layer within design depth as per engineering drawing. h. In order to avoid the soil collapse, the following method may be applied, depend on the ground condition. - Install a temporary steel pipe casing at the entire part of drilled shaft properly. The SUBCONTRACTOR shall propose the length of steel pipe casing for PGAS SOLUTION and EMPLOYER / EMPLOYER’S PERSONNEL approval. - Install a temporary steel pipe casing at the upper part of drilled shaft and filling slurry mud (bentonite or others) into drilling shaft. The SUBCONTRACTOR shall propose alternate products of slurry mud and its specifications/procedures for EMPLOYER / EMPLOYER’S PERSONNEL approval.



8.2.2



i.



Soon after boring work is finish, concrete work shall be commenced.



j.



Casing shall be use during concreting to prevent soil erotion.



Concreting a. Prior to concrete pouring, the bottom of borehole shall be cleaned out from sedimentation of mud, soil or other foreign material. b. Install fabricated rebar cage into bore hole as specified on engineering drawing. c. Considering the ground condition (refer to bore logs), SUBCONTRACTOR shall consider the necessity of using concrete pump for injecting concrete starting from the bottom of bored pile hole through concrete tremie/hose in order to avoid any necking/narrowing of pile shaft.



PT. PERUSAHAAN GAS NEGARA (Persero) Tbk.



PT. PGAS SOLUTION



PT. Connusa Energindo



BOREPILE WORK PROCEDURE Document No.



Rev.



Date



MJPN-PGAS-3514-CV-PR-008



A



01/06/2015



Page 8 of 10



d. In concrete pouring, a tremie pipe shall be used to reach the bottom of hole in order to avoid possible concrete material segregation. The tip of tremie pipe shall be embedded in concrete at least 300mm to prevent mud, water or slurry which already in the bore hole from disturbing the poured concrete e. Concreting shall be continued until the top of concrete reaches to about 100 mm above cut off level of pile indicated on engineering drawing. f. 9 (nine) cubical/cylindrical concrete samples for compressive strength test shall be taken first time at the beginning of concrete pouring, the second time at approximately the midded of concrete pouring, and the third time from the last pouring concrete mix inside the drilled shaft, each 3 (three) of them are used for 7 days, 14 days and 28 days test, respectively. Concrete testing shall conform to specification for concrete work doc. No. MJPN-PGAS-3514-CV-SP-007. g. The age of strength test, unless otherwise specified shall be 7, 14 and 28 days. 9. INSPECTION 9.1 Countermeasures shall be immediately taken for piles damaged below the cutoff elevation during pile cutting, which may include repair of pile or other method approved by EMPLOYER/ EMPLOYER’S PERSONNEL. 9.2 Pile groups (if any) shall be bored from the interior outward to provide the accessibility of drilling-machine. 9.3 The Subcontractor shall plan the bore pile work, so that harmful disturbance of the adjacent existing facilities, structures, etc. does not occur by the drilling and concreting operations. The Subcontractor shall submit the bored pile work planning to PGAS SOLUTION to get the EMPLOYER / EMPLOYER’S PERSONNEL approval prior to commence the work. 9.4 In case it is apply slurry mud, SUBCONTRACTOR shall inspect and report the slurry mud characteristic and its test result continuously for each bore hole.



10. TOLERANCE Unless otherwise specified on the engineering drawings the following tolerance values shall be acceptable.



PT. PERUSAHAAN GAS NEGARA (Persero) Tbk.



PT. PGAS SOLUTION



PT. Connusa Energindo



BOREPILE WORK PROCEDURE Document No.



Rev.



Date



MJPN-PGAS-3514-CV-PR-008



A



01/06/2015



Page 9 of 10



10.1



Piles shall be bored to the following tolerance: a. 75 mm in the horizontal or batter plane in any direction from the position indicated on the drawing b. 1 cm in 100 cm along the longitudinal axis of the slope 11. REPORT



Contractor shall keep a complete record for each pile and shall provide the following information. a. Date and start/stop time of each hole drilling b. Date and start/stop time of each hole concreting, including inspection and concrete slump test result c. Slurry mud test and inspection for each hole, if applied d. Location, description of foundation, drawing number and pile number e. Type and size of pile f. Equipment name, length of casing etc g. Elevation of the bottom of hole (end of drilling) h. Water table and ground surface elevation i. Rebar cage splicing and depth of rebar cage j. Observation of ground surface k. Pile cut off elevation l. Design and actual concrete volume m. Special notes, if any n. Drilling equipment brand name



12. ACCEPTANCE CRITERIA Bored pile planning shall be subject of approval from EMPLOYER/ EMPLOYER’S PERSONNEL. PGAS SOLUTION shall ensure that harmful disturbance does not occur to adjacent existing facilities. All bored piles damaged under cut off elevation shall be repaired or receive other counter measures with a method approved by EMPLOYER/ EMPLOYER’S PERSONNEL. Bored piles shall meet tolerance criteria, inc. horizontal, slope and elevation tolerance and information completeness according to section 10.1a and 10.1b



PT. PERUSAHAAN GAS NEGARA (Persero) Tbk.



PT. PGAS SOLUTION



PT. Connusa Energindo



BOREPILE WORK PROCEDURE Document No.



Rev.



Date



MJPN-PGAS-3514-CV-PR-008



A



01/06/2015



Page 10 of 10



13. QHSE ASPECT 13.1 Natural Environment Contractor shall ensure all personnel that involve during activity of borepile work aware of all hazard that endangered environmental and shall take proper measure for all identified hazard to environmental. The identified hazard subject to input in JSA ( Job Safety Analysis) shall minimum identify : a. Activity that may cause degradation to the natural environment b. Environment with such degradation shall be measured and to be adopted to mitigate such degradation 13.2 Community Environment and Community Relation All activities during soil investigation survey shall be integrated with effort of Employer public relation office in order to ensure minimum impact on local community relation, in general all works during borepile work that will carried by Contractor shall be : a.



Reduce



potential



negative



impact



on



communities



through



identification and mitigation via impact assessment b.



Maintain regular contact with communities that may will be affected by borepile work



c.



Manage expectation on employment opportunities by providing information on level and duration of employment requirement



d.



Seek opportunities to increase employment of local personnel in adjacent of borepile work