摘要:
PROBLEM TO BE SOLVED: To enable press-in of a pile by efficiently pushing an underground obstacle aside without reference to the size or hardness of the underground obstacle such as a stone.SOLUTION: A member 3 for pushing an underground obstacle aside, which has a polygonal pyramid-shaped part 4 provided at a leading end of a polygonal column-shaped part 5, is pushed into the underground obstacle while being rotated or swung, and a space for allowing entry of a pile 2 is formed by drawing the underground obstacle near a periphery by the polygonal pyramid-shaped part 4 at the leading end and the polygonal column-shaped part 5 continuing therefrom. Thus, the pipe 2 is pressed into the space.
摘要:
PROBLEM TO BE SOLVED: To provide a hammer grab control system which prevents a spiral failure of a hydraulic piping tube etc. by controlling rotation of a hammer grab. SOLUTION: In the hammer grab H1, a cylindrical base frame 10 is integrally provided with a stabilizer 13 which can protrude/recede in a radial direction from the side of a central portion of a casing C driven into the ground and which has a pusher 31 brought into pressure contact with an inner peripheral surface of the casing C and integrating the cylindrical base frame 10 with the casing C; a swivel mechanism 14, which comprises an inner shaft body 14a integrally connected to the stabilizer 13 and a rotatably and externally fitted outer cylinder body 14b, is provided; and the outer cylinder body 14b of the swivel mechanism 14 is provided with a hanging connection portion 5. The hammer grab control system includes a motor 3 which rotatively drives the outer cylinder body 14b of the swivel mechanism 14 via a transmission mechanism, and a motor control device 4 which corrects a circumferential torsion angle of the outer cylinder body 14b, generated during the rotation of the hammer grab H1, and which controls the running of the motor 3 so as to return the outer cylinder body 14b to a position before torsion. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To facilitate secure and appropriate retention of a wire rope at the lower end of a casing screw without the need for skill by improving a small-scale pull-out construction method for a subterranean residual pile and realize secure release of retention and secure fastening of a pile by the ring of the wire rope. SOLUTION: In the pull-out construction method for the subterranean residual pile, the ring part 15 of the wire rope 6 is retained at the lower end of the casing screw 5, and a means of releasing the retention is provided. The casing screw is lowered in a sate where it is brought into engagement with a subterranean residual pile 14. After releasing the retention of the ring part by the releasing means, the casing screw is removed by leaving the ring, and the pile is pulled out by pulling the wire rope. The retention means inserts a thread body 9 into a plurality of small holes 10 formed in the vicinity of the lower end of the casing screw and retains the ring, and the releasing means places the midpoint of a rope 19 for release along the ring of the wire rope and ties the midpoint of the rope 19 for release and the ring of the wire rope together with the thread body 9. Then the thread body 9 is cut by pulling the end on the ground side. The wire rope is wound twice in the ring part. The jig 1 has a table, an inner support 3, and a guide 11. The inner support part 3 supports the part of the ring part, and the guide part 11 is provided by corresponding to the clearance 8 between the inner support parts 3. The thread part, which is inserted into the small hole of the casing screw, is guided by the guide part 11 so that it can go around the part of the ring and turn up. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To surely pull out an existing pile when it is damaged, destroyed or ruptured. SOLUTION: This cylindrical casing for pulling out the existing pile has an excavating claw at a lower edge, and has an inside diameter larger than an outside diameter of the existing pile to be pulled out. In the casing, the plurality of claws are provided at regular spaces in a circumferential direction among them on a peripheral wall near a lower end of the casing. Each of the claws is journaled in such a manner as to be swingable between a position to be brought about almost along the peripheral wall of the casing by earth pressure in the casing during the normal rotation of the casing, and a position to be raised almost in a centripetal direction by the earth pressure in the casing during the reverse rotation of the casing. Additionally, each of the claws has a length which is set so that the claw in the position to be raised in the centripetal direction can be locked to a lower end of the existing pile when the casing is jacked into the outer periphery of the existing pile. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a cutting device capable of simply cutting an existing pile while avoiding the biting and rupture of a wire saw, and to provide a removal method for simply cutting and removing the existing pile while avoiding the biting and rupture of the wire saw. SOLUTION: An outside casing 2 and an inside casing 1 which have inside diameters larger than the outside diameter of the existing pile 10, are pressed into the ground in this order almost coaxially with the existing pile 10, and then, sediment between the inside casing 1 and outside casing 2 is at least partially removed. The existing pile 10 is cut with the wire saw 9, which is put over a drive unit, a main guide pulley and a direction changing pulley and which is guided into the inside casing 1 from a window for cutting, and cut pieces are removed. By the cutting device and the removal method for the existing pile, the cut pieces are supported by the sediment 12 in the inside casing, so as to avoid a load imposed on the wire saw 9 due to gravity applied to the cut pieces. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
PURPOSE:To crush gravels between a suction port and the tip of bit by a method in which a slide tube is set inside of the tip of a suction tube, a gravel- crushing blade is set on the tip of the slide tube, a fixed side gravel-crushing blade is provided to the bit tip, and the slide tube is lowered. CONSTITUTION:A slide tube 26 is slidably set in the axial direction on the inside of the tip of a suction tube 10 in a reverse machine to be used for a reverse circulation drill base piling work. A gravel-crushing blade 36 is also provided to the tip of the tube 26, and a fixed side gravel-crushing blade 38 is also provided to a notched part 22 forming an aperture for the basal suction port 18 of the tip 12 of the tube 10. In case where great gravels 20 are blocked in the aperture between the port 18 and the tip 12, the tube 26 is lowered by operating a driver consisting of a crushing cylinder, etc. The gravels 20 are crushed by the blades 36 and 38 and discharged from the tube 10.