Pressing in underground excavation construction method and the subterranean structure construction construction method null cartridge

摘要

PROBLEM TO BE SOLVED: To enhance the efficiency of transporting the earth and sand excavated and to make it easy to dispose of the earth and sand by allowing water-bearing earth and sand excavated to drain naturally. SOLUTION: A cylindrical sunk element 1 is pressed into the ground 3 and sunk in position, and a cylindrical temporary element 2 having a smaller diameter than the sunk element 1 is pressed into the ground 3 inside the sunk element 1. Subsoil between the sunk element 1 and the temporary element 2 is excavated by a bucket 4, and the earth and sand 5 excavated are dumped into the temporary element 2 and left there for a while. After a predetermined time has elapsed since the dumping, the earth and sand 5 dumped are discharged to the outside of the temporary element 2 and conveyed by a dump truck, etc. Therefore, the earth and sand 5 left inside the temporary element 2 are allowed to drain naturally by the force of gravity, the amount of water contained in the earth and sand 5 decreases, and the weight of the earth and sand per unit volume decreases. A hole 6 excavated is used in the construction of a foundation pile.