EXPANDED HEAD IN HOLLOW PILE INNER DIGGING/EMBEDDING DEVICE

摘要

PROBLEM TO BE SOLVED: To extract an expanded blade from the inside of the ground by being displaced to the head rod side, when the expanded blade cannot be contractively closed by nipping sediment in contractive closure. SOLUTION: In this expanded head in a hollow pile inner digging/embedding device, a piston fixing type or cylinder fixing type hydraulic cylinder is coaxially built in a head rod of a rod lower end part of excavation work; a base end part of the expanded blade is rockingly jointed by a pin on a plane passing through the axial line of the head rod in an outer peripheral part of the head rod; the other end of an operation link having one end jointed by a pin to a cylinder or a piston to be reciprocated in the hydraulic cylinder, is jointed by a pin to an intermediate part of the expanded blade for expansively and contractively rocking the expanded blade; and any one or a plurality of pins of respective pin joints of the expanded blade and the operation link, can be sheared by a collision with the hollow pile lower end of the expanded blade. COPYRIGHT: (C)2006,JPO&NCIPI