Expansion tool for expanding through-hole in ground, has elastically deformable element that elastically deforms when exerting pulling force on connection portion such that tensile force is exerted on expansion portion

摘要

The expansion tool (16) has a connection portion (38) with which a connector is connected for exerting tensile force (Ftensile) on the expansion tool. An expansion portion (28) has a specific portion (30) having cross-sectional area larger than the through-hole formed in the ground. An elastically deformable element (58) elastically deforms when exerting pulling force on the connection portion such that tensile force is exerted on the expansion tool. An independent claim is included for expansion device.