JP5252511B2 - Equipment for crushing and discharging existing concrete piles - Google Patents

Description

  The present invention relates to a crushing and discharging apparatus for an existing concrete pile for crushing and removing an existing concrete pile left in the ground as a hexavalent chromium removal measure for preventing soil contamination.

  Currently, due to the problem of soil contamination, measures to remove hexavalent chromium contained in cement are being called out. In other words, when dismantling the current house and constructing a new building (house), the old structure whose foundation was constructed with cement-based cast-in-place piles is removed to avoid subsequent soil contamination. It is necessary to take measures. To that end, it is necessary to remove the foundation and plan a new foundation without hexavalent chromium contamination.

Current countermeasure technologies include the following.
1) An improved method in which chemicals that react with hexavalent chromium are injected into the ground to prevent adverse effects, and existing concrete piles are left in the ground.
2) After burying the steel pipe casing on the outer periphery of the existing concrete pile with a large settling machine, the existing concrete pile inside is crushed and removed, and the inside of the casing is backfilled with crushed stones and sand with good ground support force, Replacement method in which pressure is applied for replacement.
3) A method in which the outer periphery of the existing concrete pile is deeply excavated, and a wire or the like is hung on the existing concrete pile and pulled out with a large crane.
4) Human-powered removal method.

  By the way, in the said improved construction method, the cost of the chemical | medical agent was very high, and there existed a problem that anxiety of imperfect improvement remained. In the replacement method and the pulling method, there is a problem that a large settling machine or crane cannot be carried in when the road or approach path is narrow as a result of the influence on the surrounding environment. It was. The human-centered removal method requires significant labor and time for workers, and the existing concrete piles that can be removed are limited to small ones. As the depth increases, work below the groundwater level becomes extremely difficult. It was.

JP 2008-272552 A JP 2007-332559 A

  The problems to be solved by the present invention are to solve these conventional problems, to save labor in the construction range, and to crush and discharge existing concrete piles efficiently at a low cost regardless of the work place and the carry-in place. The object is to provide an apparatus for crushing and discharging existing concrete piles.

The configuration of the present invention that solves this problem is as follows.
1) A crushing and discharging device for an existing concrete pile for crushing and discharging an existing concrete pile left in the ground, and the outer diameter of the existing concrete pile at the lower end of a cylindrical casing press-fitted into the ground A ring cutter for ground cutting having a larger inner diameter is provided rotatably, a crushing cutter for crushing existing concrete piles is provided rotatably in the ring cutter, and a cutter driving means for rotating the ring cutter and crushing cutter is provided. A screw conveyor with a discharge pipe is formed in the central part of the crushing cutter to take in the crushed material and excavated sediment from the existing concrete pile, and conveys the crushed material and excavated sediment from the existing concrete pile to the ground. And a conveyor driving means for driving the screw conveyor is provided. Pile crushing and discharging device 2) The existing concrete according to the above 1), wherein a plurality of screw conveyors with a casing and a discharge pipe can be added according to the depth of the existing concrete pile. Pile crushing and discharging device 3) Cutter driving means is provided at the lower part in the casing, and the ring cutter and crushing cutter are driven to rotate integrally, crushing and discharging the existing concrete pile according to 1) or 2) above Apparatus 4) Crushing and discharging apparatus for existing concrete pile according to any one of 1) to 3), wherein a crushing cutter is provided in the inner part of the ring cutter 5) Crushing for existing concrete pile according to any one of 1) to 4) An existing concrete pile removal device 6) installed so that the casing of the discharge device can be moved vertically into the ground so that it can be transferred to the ground. Removable base installed on the surface, a mast erected on the base, a bracket that moves up and down along the mast attached to the last casing, a press-fit jack that moves the bracket up and down, and a base And a holding guide that holds the press-fitting direction of the ring cutter and casing in place, and a discharge chute that is attached to the rear end of the screw conveyor and discharges crushed material from the existing concrete pile and excavated sediment outside the casing. 5) The existing concrete pile removal device described in 5) above, in which the press fitting of the press fitting device is provided with a conveyor driving means. It is equipped with a control to fill the removal trace with the material, and the underground casing in parallel with the reverse of the screw conveyor The existing concrete pile removal device described in 5) or 6) above, in which a ring cutter, a crushing cutter, and a screw conveyor can be collected by press-fitting jacks, and the fluidity of the crushed material and excavated sediment in the existing concrete pile is increased. It exists in the removal apparatus of the existing concrete pile in any one of said 5) -7) which provided the supply means which supplies the addition material or the solidification material for replacement to the position of a crushing cutter.

The present invention has the following effects.
1) Since all the crushed material of the existing concrete piles crushed in the ring cutter is discharged together with the excavated earth and sand, it can be treated reliably at a lower cost compared to the conventional method using chemicals, and then contaminated with hexavalent chromium. There is no worry.
2) Since the press-fitting device installed on the ground is press-fitted into the ground while adding a casing of a predetermined length and a screw conveyor, the device can be downsized compared to conventional sinking machines, and the work place can be selected and relocated. Easy to use with a small crane.
3) Since the existing concrete piles are crushed and removed, there is no need for a large crane or the like that pulls up the existing concrete piles as in the prior art, and no matter where the equipment is carried in.

It is explanatory drawing of the removal apparatus of an Example. It is explanatory drawing of the crushing discharge apparatus of an Example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be specifically described based on examples and drawings.

  FIG. 1 is an explanatory diagram of the removal device of the embodiment, and FIG. 2 is an explanatory diagram of the crushing and discharging device of the embodiment. In the figure, 1 is a ring cutter, 1a is a cutter, 2 is a crushing cutter, 2a is a drive unit, 2b is a motor, 2c is an inlet, 2d is an injection path, 3 is a screw conveyor, 3a is a screw with a shaft, 3b is Discharge pipe, 3c is a discharge chute, 3d is a motor, 4 is a casing, 5 is a press-fitting device, 5a is a base, 5b is a mast, 5c is a metal fitting, 5d is a press-fitting jack, 5e is a holding guide, 6 is an additive plant, 6a and 6b are injection pipes, 7 is a truck, 8 is a belt conveyor, A is a removal device, B is a crushing and discharging device, C is an existing concrete pile, Ca is a crushed material, and G is the ground.

  As shown in FIGS. 1 and 2, the ring cutter 1 of the crushing and discharging apparatus B is formed to have an inner diameter larger than the outer diameter of the existing concrete pile C to be removed, and a plurality of cutters 1 a are protruded from the lower end.

  The crushing cutter 2 is provided with a driving unit 2a and a motor 2b for rotating and driving the crushing cutter 2 for the outer periphery and the inner periphery. The outer diameter of the drive unit 2a is formed to be the same as that of the ring cutter 1, and an inlet 2c is formed through the center for attaching the screw conveyor 3, and an injection path 2d for injecting an additive is formed. It penetrates. The upper end of the ring cutter 1 is connected to the rotating portion of the drive unit 2a, and the crushing cutter 2 is disposed in the inner part of the ring cutter 1, so that the ring cutter 1 and the crushing cutter 2 can rotate integrally.

  The screw conveyor 3 includes a screw 3a with a shaft, a discharge pipe 3b, a discharge chute 3c, and a motor 3d. The screw conveyor 3 is inserted and attached to a through portion of the drive unit 2a, and a lower end is communicated with the intake port 2c. The screw 3a with a shaft and the discharge pipe 3b are connected to be connected. The shaft-attached screw 3a can be rotated forward and backward, and is controlled to rotate forward when removed, and is controlled to rotate backward when backfilled.

  The casing 4 is formed in the same diameter as the outer diameter of the drive part 2a of the ring cutter 1 and the crushing cutter 2. The rear end shaft-equipped screw 3a and the discharge pipe 3b are attached to the rear end casing 4, and the discharge chute 3c penetrates the rear end casing 4 downward.

  The press-fitting device 5 includes a base 5a installed on the ground, a mast 5b erected on the base 5a, and a metal fitting 5c that is attached to the upper end of the casing 4 for the rear end and moves up and down along the mast 5b. The press fitting 5c moves up and down and is assembled so that it can be disassembled by a hydraulic press-fit jack 5d and a holding guide 5e that holds the ring cutter 1 and the press-fit direction of the casing 4 in place. The stroke of the press-fit jack 5d has the length of one casing 4. The press-fit jack 5d can be pushed and pulled, and is controlled to retract when removed, and is controlled to extend when the crushing and discharging apparatus B is removed after removal.

  In this embodiment, the press-fitting device 5 is installed at the position of the existing concrete pile C, the truck 7 is arranged at a position adjacent to the press-fitting device 5, and the belt conveyor 8 is placed between the loading platform of the truck 7 and the position directly below the discharge chute 3c. Is installed on a seesaw. The additive plant 6 is installed at a position adjacent to the press-fitting device 5, and one injection pipe 6 a is passed through the casing 4 and connected to the injection path 2 d of the drive unit 2 a, and the other injection pipe 6 b is passed through the casing 4. Then, it is connected to the middle position of the discharge pipe 3b of the screw conveyor 3. The holding guide 5e is fixed at a position directly above the existing concrete pile C, and supports the lower end portion of the ring cutter 1 to hold the press-fitting direction.

  When the motors 2b and 3d are driven and the press-fit jack 5d is gradually retracted, the ring cutter 1 cuts the ground G into an annular shape, and the ground G and the existing concrete pile C are taken into the ring cutter 1 It is crushed with the crushing cutter 2. At this time, crushing of the existing concrete pile C is performed in the inner part of the ring cutter 1, so the crushed material Ca is shielded by the ring cutter 1 and is not scattered on the ground G. The crushed material Ca is taken together with the excavated earth and sand from the intake port 2c, conveyed upward by the screw 3a with a shaft, discharged from the discharge chute 3c to the belt conveyor 8, and loaded onto the loading platform of the truck 7. The angle of the belt conveyor 8 is gradually changed in accordance with the position of the discharge chute 3c that moves downward when the casing 4 is press-fitted. If the crushed material Ca or excavated sediment is difficult to discharge due to low fluidity, when the additive material 6 injects an additive such as muddy water through the injection pipes 6a and 6b, the fluidity in the ring cutter 1 and the screw conveyor 3 Can be discharged quickly. Also at this time, the additive is shielded by the ring cutter 1 and does not leak to the ground G.

  When the press-fit jack 5d is fully retracted, the motors 2b and 3d are stopped, the rearmost casing 4, the shaft screw 3a and the discharge pipe 3b are separated from the front, the press-fit jack 5d is extended, and the belt conveyor 8 is Return to angle. Then, the next casing 4, the shaft-equipped screw 3a, and the discharge pipe 3b are connected and connected, and the motors 2b and 3d are driven to degenerate the press-fit jack 5d. By repeating these steps, the existing concrete pile C left in the ground is removed.

  When the removal is completed, the motor 2b is stopped and the motor 3d is reversed, and a backfill material such as sand, crushed stone chips of about 20 to 40 mm, fine aggregate, and the like is introduced from the discharge chute 3c through a tube (not shown). The backfilling material is conveyed downward by the screw 3a with the shaft, discharged from the intake port 2c, and filled in the removal trace of the existing concrete pile C. While inserting the backfill material, the press-fitting jack 5d is gradually extended, and the casing 4, the shaft screw 3a, and the discharge pipe 3b are pulled out from the ground.

  When the press-in jack 5d is fully extended, the motor 3d is stopped, the last casing 4, the shaft-attached screw 3a, and the discharge pipe 3b are separated from the front, and the pulled-out casing 4, the shaft-attached screw 3a, and the discharge pipe 3b are recovered. Then, the press-fit jack 5d is retracted to connect the casing 4 for the rearmost end, the shaft-attached screw 3a, and the discharge pipe 3b to the front, the motor 3d is reversed, and the press-fit jack 5d is extended while charging backfill material. By repeating these steps, the removal trace of the existing concrete pile C is backfilled with the backfill material while the crushing and discharging apparatus B is pulled out. Moreover, it replaces with injection | throwing-in of a backfill material, and it may supply the gel-like solidification material for replacement | exchange with neutral pH in an additive material plant 6 to a removal trace, and may construct a pile without hexavalent chromium contamination. When the construction is completed, the press-fitting device 5 is moved to the position of another existing concrete pile C with a crane or the like, and the removed crushing and discharging device B is reused to be removed and backfilled or the pile reconstructed.

  The technology of the present invention is used for removing PC piles and RC piles with thin unreinforced concrete and steel bars.

DESCRIPTION OF SYMBOLS 1 Ring cutter 1a Cutter 2 Crushing cutter 2a Drive part 2b Motor 2c Intake port 2d Injection channel 3 Screw conveyor 3a Screw with shaft 3b Discharge pipe 3c Discharge chute 3d Motor 4 Casing 5 Press-fitting device 5a Base 5b Mast 5c Press fitting 5d Press-fit jack 5e Holding guide 6 Additive material plant 6a, 6b Injection pipe 7 Truck 8 Belt conveyor A Removal device B Crushing and discharging device C Existing concrete pile Ca Crushed material G Ground

Claims (8)

  A crushing and discharging device for existing concrete piles for crushing and discharging existing concrete piles that remain in the ground, and is larger than the outer diameter of the existing concrete piles at the lower end of a cylindrical casing that is pressed into the ground A ring cutter for ground cutting having an inner diameter is rotatably provided, a crushing cutter for crushing an existing concrete pile is rotatably provided in the ring cutter, and a cutter driving means for rotationally driving the ring cutter and the crushing cutter is provided for crushing. An intake port is formed at the center of the cutter to take in the crushed material and excavated sediment from the existing concrete pile, and a screw conveyor with a discharge pipe is installed at the intake port to convey the crushed material from the existing concrete pile and excavated soil to the ground. An existing concrete pile provided with a conveyor driving means for driving the screw conveyor Crushing the discharge device.   The crushing and discharging apparatus for existing concrete piles according to claim 1, wherein a plurality of screw conveyors with a casing and a discharge pipe can be added according to the depth of the existing concrete pile.   The crushing and discharging apparatus for an existing concrete pile according to claim 1 or 2, wherein the cutter driving means is provided at a lower portion in the casing and integrally rotates the ring cutter and the crushing cutter.   The crushing and discharging apparatus for an existing concrete pile according to any one of claims 1 to 3, wherein a crushing cutter is provided in the inner part of the ring cutter.   The removal device of the existing concrete pile which installed the press-fitting apparatus which press-fits the casing of the crushing discharge apparatus of the existing concrete pile in any one of Claims 1-4 perpendicularly into the ground so that transfer is possible on the ground.   The press-fit device has a removable base installed on the ground, a mast erected on the base, a metal fitting that is attached to the last casing and moves up and down along the mast, and a press-fit that moves the metal fitting up and down A jack, a holding guide that attaches to the base to hold the press-fitting direction of the ring cutter and the casing in place, and a discharge chute that attaches to the rear end of the screw conveyor and discharges the crushed material and excavated sediment from the existing concrete pile The removal device of the existing concrete pile according to claim 5, wherein a conveyor driving means is provided in the press fitting of the press-fitting device.   The conveyor drive means is equipped with a control that reverses the screw conveyor and fills the removal site with the backfill material introduced from the rear end of the screw conveyor, and in parallel with the reverse rotation of the screw conveyor, The existing concrete pile removing apparatus according to claim 5 or 6, wherein a ring cutter, a crushing cutter, and a screw conveyor can be recovered by being pulled out with a press-in jack.   The removal of the existing concrete pile according to any one of claims 5 to 7, further comprising supply means for supplying an additive material for increasing the fluidity of the crushed material of the existing concrete pile and excavated sediment or a solidifying material for replacement to the position of the crushing cutter. apparatus.

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