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The scope of tesing piling work is the static load test and dynamic load test will be conducted for one PHC D800 type B pile and two PHC D600 Type A. Detail location is shown on the Attachment 1, PRELIMINERY TEST PILE PLAN PLOT PLAN_VP10L4CGEN00021.
For Approval VAN PHONG BOT THERMAL POWER PLANT PROJECT WORK ITEM: TEST PILE WORK REV DATE DESCRIPTION Doc Title: Method Statement for T Approved Checked Prepared OWNER VAN PHONG POWER COMPANY LIMITED PROJECT Van Phong BOT Thermal Power Plant Project Status □Approved □Approved with Comment □Not Approved □Reviewed OWNER’S ENGINEER Pöyry Switzerland Ltd EPC CONTRACTORS IHI–TESSC–CTCI–DHI CONSORTIUM PROJECT DOCUMENT No VP1- REV DOCUMENT TITLE METHOD STATEMENT FOR TEST PILLING WORK EPC EPC DOCUMENT No REV VAN PHONG BOT THERMAL POWER PLANT PROJECT WORK ITEM: TEST PILE WORK Doosan Heavy Industries and Construction Doc Title: Method Statement for Test pile works VP1- VAN PHONG BOT THERMAL POWER PLANT PROJECT WORK ITEM: TEST PILE WORK Doc Title: Method Statement for Test pile works CONTENTS PREFACE 2/29 REFERENCES .2/29 SCHEDULE……………………………………………………………… .…….3/29 SITE ORGANIZATION…………………… …………… ………………………3/29 MOBILIZATION PLAN OF WORKFORCE 3/29 MOBILIZATION PLAN OF CONSTRUCTION HEAVY EQUIPMENT .4/29 MATERIAL 4/29 CONSTRUCTION METHOD .6/29 STATIC LOAD TEST 9/29 10 TENSILE LOAD TEST .14/29 11 HORIZONTAL STATIC COMPRESSION TEST 18/29 12 HIGH STRAIN DYNAMIC LOAD TEST 22/29 13 QUALITY CONTROL 25/29 14 ENVIRONMENT, HEALTH AND SAFETY 25/29 PURPOSE OF TEST PILE: - Determine the characteristic value of the pile and provide test parameters for engineer pile foundation VAN PHONG BOT THERMAL POWER PLANT PROJECT WORK ITEM: TEST PILE WORK Doc Title: Method Statement for Test pile works a The load (compressive and lateral) 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 capacibilities 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 Pile Diameter D800 – Class B D600 – Class A D600 – Class A Quantity of test pile Location Kind of testing pile Chimmey Vertical,, Lateral and Uplift load test Coal Storage Vertical,, Lateral and Uplift load test Water Treatment Vertical,, Lateral and Uplift load test Scope of work: The scope of tesing piling work is the static load test and dynamic load test will be conducted for one PHC D800 type B pile and two PHC D600 Type A Detail location is shown on the Attachment #1, PRELIMINERY TEST PILE PLAN PLOT PLAN_VP1-0-L4-C-GEN-00021 The pile PHC D600 – Type A and D800 – Type B for production pile is shown on the Attachment #2, PHC-D800-01-VP1 and PHC-D600-02-VP1 PREFACE DOOSAN heavy industries & construction (DHI), the EPC Contractor of project, herewith submits this method statement to describe the methodology regarding implementation plan for the test piling works DHI intends safe, reliable and quality execution of its scope to the maximum extent that can be achieved 3.1DEFINITION Project Project Company/Owner Contractor / DHI Subcontractor Van Phong BOT Thermal Power Plant Doosan Heavy Industries & Construction Phan Vu Investment Corporation 1.2 Application Application of this Method Statement is limited to the scope of test piling of Pre-drilled PHC piling works VAN PHONG BOT THERMAL POWER PLANT PROJECT WORK ITEM: TEST PILE WORK Doc Title: Method Statement for Test pile works REFERENCE a Construction Drawings (includes all reference drawings, schedules, sketches, etc) b DOOSAN/Owner Project Specifications c JIS A5373-2010 “Pre-stressed Spun Concrete Piles (PHC pile)” d TCVN 7888-2014 Pre-tensioned spun concrete pile e TCVN 10667-2014 Spun concrete pile – Pile drilling and Installing – Construction and acceptance f TCVN 9393-2012 Piles – Standard test method in situ for piles under axial compressive load g TCVN 9394 : 2012 Pile Pressing and Driving – Standard for construction, checking and acceptance h ASTM D 1143 - “Standard test method for Deep Foundations under Static Axial Compression Load” i ASTM D 3689 - “Standard test method for Deep Foundations under Static Axial Tensile Load” j ASTM D 3699 - “Standard test method for Deep Foundations under Lateral Load” k ASTM D 4945 - “Standard Test Method for Pile under PDA/DLT” Schedule VAN PHONG BOT THERMAL POWER PLANT PROJECT WORK ITEM: TEST PILE WORK Doc Title: Method Statement for Test pile works Site organization MOBILIZATION PLAN OF WORK FORCE Assigned Position Number Foreman Crane driver Drilling and drive machine driver Welders Mixing Machine operator Surveyors General labors 1 1 Remarks Mixer and Pump, etc VAN PHONG BOT THERMAL POWER PLANT PROJECT WORK ITEM: TEST PILE WORK Doc Title: Method Statement for Test pile works MOBILIZATION PLAN OF CONSTRUCTION HEAVY EQUIPMENT Heavy Equipment Crawler Crane Upper auger Under auger DH608-120M(Base machine) Mixing machine Excavator Compressor Air hammer Electric Generator Generator for Base machine Number 1 1 1 1 1 Capacity Remarks 150T 9T 14T 65T 7T 15T 9T 3T 3.7T 3.7T Consist of Mixer and Pump,.etc If needed MOBILIZATION PLAN OF TESTING EQUIPMENT Testing Equipment Number Certificate No Remarks VAN PHONG BOT THERMAL POWER PLANT PROJECT WORK ITEM: TEST PILE WORK Doc Title: Method Statement for Test pile works 10.MATERIAL 10.1 Hardening Cement Milk Grouting 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 - - 10.2 Cement 2400 kg Water 1700 L Compressive Strength 200 kg/cm2 Mix design and raw material for pile D800B, pile length 20m and Drilling holes diameter D900 Cement 3,330 kg Water 2,330 L Compressive Strength 200 kg/cm2 PHC Pile Piles shall be manufactured in accordance with JIS A 5373 (or equivalent Vietnamese code) No Diameter (mm) Clas s Effective Prestress (N/mm2) Thickness (mm) Compressive Strength of Concrete (N/mm2) Allowable Axial Force (tonf) 600 A 4.0 90 80 155 800 B 8.0 110 80 300 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 VAN PHONG BOT THERMAL POWER PLANT PROJECT WORK ITEM: TEST PILE WORK Doc Title: Method Statement for Test pile works 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 larger than PHC pile diameter 10cm 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 weight d PHC pile is fixed to the bearing capacity by hammer (The capacity of PHC pile is 6281kN) (For multi-segment pile, splicing will be applied at a service hole before installing pile) e A pile is fixed to bearing layers by the drop hammer Light Blow BlowBento nite Hardeni ng cement Completion of Predrilled hole Auger Drilling f Slurry Auger pulling up Injection Pile Insertion Light Blow 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 VAN PHONG BOT THERMAL POWER PLANT PROJECT WORK ITEM: TEST PILE WORK Doc Title: Method Statement for Test pile works (Excavating Soil to Designed Depth By DTH Method’s Auger Machine) 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 beween 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 & rebonding side friction of pile Cement milk grouting should be complied with requirement of JRA code The time for slurry to get hard is approximately ÷ hours (According to machenical target of Cement PCB40 of Nghi Son using at site) 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 verticalty 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