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1. 发明专利

JP2000282463A ENLARGED HEAD 失效
公开(公告)号：JP2000282463A
公开(公告)日：2000-10-10
申请号：JP8546299
申请日：1999-03-29
申请人： KAWASAKI STEEL CO , TOKYO SEISAKUSHO KK , GEOTOP CORP , NOZAKI KENKO KK , KAWATETSU TECHNO CONSTRUCTION
发明人： WAKIYA HIROSHI , MOTOKI TAKUYA , OKI TAKESHI , INOUE HACHIRO , SUMI KOJI , FUKUDA KAZUO , MORIMOTO NORIHIRO
IPC分类号： E21B10/32 , E02D7/00
摘要： PROBLEM TO BE SOLVED: To pull up an auger in a reverse rotation manner by providing a restriction part at a sliding part between a shaft and an auger connection shaft, providing a stopper on an enlarged blade, forming a protrusion on an outer surface of the connection shaft, thereby making abutment between the stopper and the protrusion at one side of the sliding part while perforing separation on the other side. SOLUTION: Underground excavation is performed by a excavation blade 105 of an enlarged head connected at a tip of the bead after a spiral auger 103 is rotated, then exavated soil is discharged onto the ground by the auger 3 and a pile 102 is driven in the groud. Next, when the pile 102 reaches a support layer, a preceeding excavation is performed with the normal rotation of the blade 105, then an enlarged blade is enlarged in its diameter to stir a portion of foundation consilidation bulb 106. Thereafter, the bulb is buit up by jetting out cement milk or the like, then it is pulled in the pile with the enlarged blade reducedin its diameter and the auger 103 is pulled up by the reverse rotation, and the cement milk is poure in the pipe. Then, a tip of the pile 102 is pushed in the inside of the bulb 106 for integration. Accordingly, increase and decrease in the diameter of the enlarged blade are controlled by means of a spline mechanism, and thereby enlargement or shrinkage of the enlarged blade can be made with such a simple mecanism.

2. 发明专利

JP2000282773A WIDENED HEAD FOR PILE INSTALLATION BY INNER EXCAVATION 失效
公开(公告)号：JP2000282773A
公开(公告)日：2000-10-10
申请号：JP8546199
申请日：1999-03-29
申请人： KAWASAKI STEEL CO , TOKYO SEISAKUSHO KK , GEOTOP CORP , NOZAKI KENKO KK , KAWATETSU TECHNO CONSTRUCTION
发明人： WAKIYA HIROSHI , MOTOKI TAKUYA , OKI TAKESHI , INOUE HACHIRO , SUMI KOJI , FUKUDA KAZUO , MORIMOTO NORIHIRO
IPC分类号： E21B10/32 , E02D5/44 , E02D7/00
摘要： PROBLEM TO BE SOLVED: To pull a widened head for pile installation by inner excavation widening a diameter by reverse rotation in a hollow pile by the reverse rotation by providing a projection piece preventing contact for the inner wall of the hollow pile of the widened bit of the edge part of a widened wing on the widened wing, and providing a stabilizer restricting the eccentricity of the rotation center of the widened bit and the center of a hollow pile. SOLUTION: A projection 20 such as a roller for reducing the contact resistance of a widened wing 11 is provided, and a stabilizer 40 (40a-40d) for suppressing the slippage displacement amount of an auger shaft is provided. The bit edge of the widened wing 11 is not brought into contact with the inner wall face 111 of a pile even when a widened head is in any eccentric state by geometrically finding the suitable relative relation of the projection 20 and the stabilizer 40 based on the position of the attaching pin 15 of the widened wing 11, the shape size of the widened wing 11, the inner wall size of a pile 110, the attached position of the projection 20 or the like. Thereby even when the widened head 10 is reversely rotated, reverse rotation pulling can be made possible because the edge part of the bit of the widened wing 11 comes into contact with the pile inner wall not to become resistance.

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