Method Statement For Piling Works 5w1o6a

METHOD STATEMENT FOR PILING WORKS CONTINOUS FLIGHT AUGER (CFA) Note: Preparatory works like pile cage fabrication, backfilling to platform level, trial mix and other mobilization works are not included in this method statement. This method statement is for the actual piling operation after all the preliminaries have been completed. 1. WORKS STARTS BY SETTING OUT MARKERS FOR THE CORRECT LOCATION OF PILES.

(Photo taken during the setting out of piles by Sardina Foundations under supervision Zuhair Fayez Partnership Consultants, Jizan University Project, Jizan, KSA)

Coordinates of piles which were approved by the consultant are set out on the ground. The pile locations are marked by steel stakes buried approximately ten centimeters below grade to avoid getting disturbed by construction traffic. Just over the steel stake is a plastic marker with the pile number for easier identification. After completing the first batch of setting out, the Consultant together with the contractor's surveyor will check the stakes for correctness.

2.

THE BORING MACHINE IS POSITIONED OVER THE PILE LOCATION.

(Photo taken during the actual piling work by Sardina Foundations under supervision Zuhair Fayez Partnership Consultants, Jizan University Project, Jizan, KSA) The steel stake marking the exact pile coordinate is excavated manually. The plastic marker containing the pile number is taken and the auger gate is closed.

gate open

gate closed 3. THE DRILL IS POSITIONED IN THE EXACT LOCATION OF THE PILE CENTER LINE BY USE OF PLUMB BOB.

(Photo taken during the actual piling work by Sardina Foundations under supervision Zuhair Fayez Partnership Consultants, Jizan University Project, Jizan, KSA) With the mast in vertical position and the gates at auger tip closed, the auger tip is lowered and maneuvered to be directly and precisely over the steel stake. The pile number is then recorded into the Daily Pile Casting Log (see the man on the right picking the plastic marker containing the pile number). Before drilling commences the mast shall be checked for verticality in both orientations by the digital sensors in the machine. There is also an external bubble gage on the mast if the Consultant wishes to make a random check from the outside.

4. DRILLING STARTS ONCE THE DRILL IS IN EXACT POSITION OVER THE CENTER LINE OF PILE.

5.

PROGRESS OF DRILLING AND DEPTH IS BEING MONITORED THRU DIGITAL EQUIPMENT MOUNTED ON THE MACHINE AND BY MEANS OF A MARKER ON THE RIG OF THE DRILL.

(Photo taken during the actual piling work by Sardina Foundations under supervision Zuhair Fayez Partnership Consultants, Jizan University Project, Jizan, KSA) The digital sensor mounted on the dashboard of the equipment also monitors the verticality of the drill ensuring a properly aligned pile. For a more detailed information on CFA drills visit soilmec.com

6.

UPON REACHING THE FULL DEPTH REQUIRED, RETRACTION OF THE DRILL

STARTS IF THE CONCRETE IS ALREADY AVAILABLE ON SITE; OTHERWISE, THE OPERATOR MUST WAIT UNTIL THE CONCRETE ARRIVES AT THE CONCRETE PUMP.

(Photo taken during the actual piling work by Sardina Foundations under supervision Zuhair Fayez Partnership Consultants, Jizan University Project, Jizan, KSA) The concrete pump and hose shall be primed with cement grout at the commencement of each days piling work. Ready mix concrete shall be discharge into the pump hopper and the pump operator will visually inspect and confirm the satisfactory condition of the concrete prior to pumping. The auger is withdrawn only when the pumping has commenced. The auger gate which was closed prior to drilling will be forced open by the pressure of the concrete. CHECKING OF CONCRETE

Concrete delivery receipt will be checked for specified strength, cement content, cement type and micro silica content. Micro silica is an essential additive for concreting works in the Gulf Region and in areas where the piles are exposed to acidic soil. Slump shall be checked and it should be within the specified slump (for this project the specified slump is 18 centimeters to 22 centimeters). Maximum allowed temperature at point of discharge is 32 degrees Celsius. Samples for strength test shall be taken at a specified rate in the contract and samples for durability test shall be taken at a rate of one sample every 1000 cubic meters of concrete.

7.

CONCRETE IS PUMP INTO THE DRILLED HOLE WHILE THE DRILL IS BEING WITHDRAWN TO ENSURE THAT THE DRILLED HOLE IS FILLED WITH CONCRETE AND THERE IS NO COLLAPSING OF THE SORROUNDING SOIL.

(Photo taken during the actual piling work by Sardina Foundations under supervision Zuhair Fayez Partnership Consultants, Jizan University Project, Jizan, KSA) As the auger is withdrawn, concrete shall be pumped through the auger stem to construct the

pile. The rig operator shall monitor the concrete flow, pressure, depth and rate of extraction by means of digital equipment mounted on the rigs dashboard. Positive pressure must be maintained on the concrete in auger stem during the concreting operations. As the auger is being withdrawn, flights shall be cleaned of spoil by spade or auger cleaner. At regular intervals during withdrawal, spoil built up at the foot of the auger shall be withdrawn clear by payloader or bobcat without touching the auger. Prefabricated steel cage is also ready on site and attached to a lifting cable connected to the rig. Note that the steel cage is ed on wood to avoid touching the soil which is acidic.

The CFA drilling machine used in this project is a SOILMEC Drill equipped with its own concrete pump. For more technical information about CFA drills, visit http://www.soilmec.it/

8.

STEEL CAGE IS RAISED UP AND PREPARED FOR INSTALLATION WHILE THE PAYLOADER IS REMOVING THE EXCAVATED SOIL AROUND THE DRILLED HOLE.

When the auger tip is withdrawn from the ground the rig shall be tracked away. The spoil at the pile head shall be removed by the payloader to expose the pile top.

9.

THE REMAINING SOIL AROUND THE HOLE IS REMOVED MANUALLY AND THE STEEL IS POSITIONED FOR INSTALLATION.

The pile cage is inserted vertically into the fluid concrete and is driven partially by alternate dropping and lifting.

10. THE STEEL CAGE IS DRIVEN FOR PULL PENETRATION INTO THE DRILLED HOLE BY MEANS OF A VIBRATOR WHICH IS PART OF THE ACCESSORIES OF THE SOILMEC DRILLS.

11. AFTER COMPLETE PENETRATION OF THE STEEL CAGE, THE EQUIPMENT MOVES TO ANOTHER PILE LOCATION.

(Photo taken during the actual piling work by Sardina Foundations under supervision Zuhair Fayez Partnership Consultants, Jizan University Project, Jizan, KSA)

For piles of one meter diameter and about 24 meter depth, the whole process from starting drilling up to complete fixing of the steel cage can take an average of 30 minutes per pile. For piles 0.75 meter diameter by 20 meter depth, the complete process from start to finish will take about 15 minutes per pile. A formal Daily Pile Execution Report is submitted by the piling contractor to the main contractor for verification and signature. The main contractor then sends the report to the consultant for signature and approval. Copy of the signed Daily Pile Execution Report is attached to the Daily Report of the main contractor which is then submitted to the consultant for comme nts and signature.

(Photo of actual Daily Pile Execution Report prepared by Sardina Foundations under

supervision Zuhair Fayez Partnership Consultants, Jizan University Project, Jizan, KSA)

Note: Safety issues are not discussed in this method statement. One thousand six hundred (1600) piles were completed in this project in a span of three months and there was only one minor accident that happened. And this was due to the fact that the person who committed the blunder was a first timer in this kind of operation. Prepared by : Engineer Raul C. Yalung