Question

Suggest the most suitable piling technique used for sandy soil encountered at the worksite. Explain the pile erection procedure step by step.

Answer 1

Technique of vibratory pile hammers are best suited for sandy soils.

Pile errection steps:-

• Testing the ground for the soil type and hard layer depth.

• Calculating the structure load so that it can be determined the need of pile size, material of pile.

• Production of piles can be done at precast stations with specifications according to the calculation then send it to the project location using a large trucks.( or in case of cast in setu we directly cast the pile in ground)

• Pile lifting can use tower crane or crane car with the position of lift point according to calculation so that there is no broken in appointment.

• The surveyor made a field measurement to determine the points according to the drawing and then set up the theodolite to check the erection of the erection.

• The pile raised perpendicularly then the position of the end diesel hammer increased and the paal cap inserted on the head of the pile.

• Ensure the position of the upright pile and control every 2 m, the erection is carried out to the planned depth elevation.

• The remaining piles above the plan elevation are stripped of concrete so that the remaining reinforcing steel will be used as cuttings to be associated with a pile cap on the building or abutment on the bridge construction.