Pile Construction

1. Boring: To ensure accurate boring of the pile, four reference points should be established, forming two perpendicular lines, with each point located 1.5 meters from the pile center. Initially, bore a 2-meter depth using a cutting tool of the desired pile diameter. Subsequently, continue boring as per sub-soil investigation report, employing a liner, Bentonite, or a combination as needed.

A temporary guide casing, app. 2 meters in length with an outside diameter matching the nominal pile diameter, should be lowered into the borehole. Ensure that the diameter of the cutting tool is slightly smaller, up to a maximum of >75 mm the outside diameter of the casing, to allow free movement within the casing during operation. Check and adjust the position and alignment casing of guide with respect to the fixed reference points around location of pile to avoid deviation from the exact pile location.

Boring should proceed upto the the hard strata where foundation is placed as specified in the drawings or pre-determined depth, with intermittent use of Bentonite slurry as required. Before starting the boring of pile, ensuring that Bentonite is fully dispersed in water and reaches the required density to stabilize the borehole sides. Bentonite slurry of the specified quality should be continuously circulated during the boring process.

The Bentonite is used for stabilization of the borehole must meet the requirements listed in the inspection and test plan. During boring, check the density of the Bentonite solution to ensure it is between 1.05 g/cc and 1.12 g/cc, with marsh cone viscosity ranging from 30 to 40 and a pH value between 9.5 and 12. Use high-pressure reciprocating or vertical pumps to inject the Bentonite slurry into the borehole, allowing it to overflow. The overflow, including bored mud and soil, will be collected in sediment tanks where sediments settle, and the Bentonite can be reused. If needed, pass the Bentonite through a de-sander tank to remove sand particles before reuse. Record the depth of the pile with a sounding chain and document the exact depth in the pile report. 



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