Static Densification Pile Construction Method: SDP Construction Method
The SDP Construction Method is a construction method that prevents ground liquefaction by using static energy to form piles in liquefiable ground. As the pile material, either sand or a mixture of soil generated by construction and a stabilizer (cement) can be used.
Piles are formed by an integrated double-walled pipe casing consisting of an outer pipe, which is screwed into the ground by rotational penetration, and an inner pipe, in which the pile material is forcibly fed into the ground and compacted. The SDP method enables effective utilization of soil generated by construction and low vibration, low noise construction by static compaction.
- Vibration and noise can be reduced because compaction is performed by static energy.
- Construction-cost savings are possible because soil generated by construction can be used in piles as a recycling measure.
- In the double-walled pipe casing method, the outer casing pipe is driven by rotational penetration. Compaction is performed by vertical movement, and pile material is forcibly pressed into the ground by compressed air in the inner pipe. As a result, uniform piles can be formed.
- An improvement effect equal to that of the conventional method has been confirmed.
- A wide range of materials can be used as the pile material, from conventional sand material to cement-stabilized surplus construction soil.