EARTH ANCHORING DEVICE FOR CONSTRUCTION EQUIPMENT

PURPOSE: To obtain a supporting force surely irrespective of ground conditions. CONSTITUTION: A pair of enlarging blades 3 and 3', which are laid out as opposed, centering on a shaft center, are turnably pivoted on pivotal axes 4 in the opposed direction on the upper end. A forcible extending wedge 7, which is installed to the tip of an operation main shaft 6, which moves back and forth by means of a hydraulic cylinder 5 set up in an anchor rod 1, is interposed in a gap produced between the enlarging blades 3 and 3'. The enlarging blades 3 and 3' are formed in circular shape on the outer peripheral surface like the cross section of the anchor rod 1 in a mutually shrunken state. Spiral blades 8 and 8' are installed on the outer peripheral surfaces. Taper cam boards 9 and 9' are projectingly installed to the mutually opposed inner surfaces at each engaged part while the forcible expanding wedge 7 is united with the enlarging blades 3 and 3' in one piece when it is in a close contact state between the enlarging blades 3 and 3' in a shrunken state, thereby forming a drum-like shape in the transverse section so that its cross section may be identical to that of the anchor rod 1. Wedge action surfaces 10 and 10' are formed on the surfaces opposed to the taper cam boards 9 and 9' of the enlarging blades 3 and 3'.