JP3737775B2 - Method and apparatus for removing existing piles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for removing an existing pile, and more particularly to a method for installing and removing a casing tube so as to surround the existing pile.
[0002]
[Prior art]
In construction work such as urban redevelopment and bridge replacement, the existing piles such as concrete piles and steel pipe piles are generally removed by installing casing tubes so as to surround the existing piles with a rotary press-fitting device used in the all-casing method. is doing.
[0003]
In this method, as shown in FIG. 5, a casing tube is built so as to surround an existing pile, a hung Maglab 41 suspended on a crawler crane 40 is dropped to crush the existing pile, and the fragments are discharged together with earth and sand. . However, when this method is used, it takes time to crush the existing piles, and crushing may be difficult. In general, a heavy chisel is suspended from the crawler crane 40 and dropped to remove the existing piles. It is crushed and discharged with a hammaglab 41.
[0004]
[Problems to be solved by the invention]
However, with such conventional means, several tons of chisel are allowed to fall freely on the existing piles, so that large impacts and vibrations are generated and noise is a problem. In addition, when the existing pile has a reinforcing bar, the reinforcing bar may be entangled with the hammer magnet when discharged by the hammer magnet, or the shell of the hammer magnet may bite between the existing pile and the casing tube, and the hammer magnet cannot be pulled up.
[0005]
Accordingly, an object of the present invention is to provide a method and an apparatus for removing an existing pile efficiently with less noise and vibration.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention adopts the following means. That is,
In the method of removing the existing pile by installing the casing tube with a rotary press-fitting device so as to surround the existing pile, after installing the casing tube so that the existing pile is off the center, the drive with the folded wing at the lower end A folding device fixed to the lower end of the grip mechanism for locking the rod to the inner peripheral surface of the casing tube is suspended by a crane and inserted into the casing tube, and the folded blade is press-fitted with a rotary press-fitting device. by dynamic contact with the existing pile, which was倒折it is characterized by discharging the existing pile倒折in Hanmagurabu.
[0007]
In the present invention, an existing pile is folded to an appropriate length by a folding device and removed.
Since the center part of the casing tube press-fits the inverted wings, when installing the casing tube, the existing pile should not be located in the center part.
[0008]
In the folding device, a drive rod having folding blades is fixed to a grip mechanism. The configuration of the grip mechanism is not particularly limited as long as it can be locked to the inner peripheral surface of the casing tube. In addition, the folded wing needs to have a shape that can be easily pressed into the ground.
[0009]
According to a third aspect of the present invention, the folding device includes a grip mechanism that is expanded in the radial direction and engaged with the inner peripheral surface of the casing tube, and is attached to a lower end of the grip mechanism. It is desirable to use a drive rod that projects in the radial direction of the tube and has a plurality of inverted wings fixed at the lower end.
[0010]
The inverted wings are provided symmetrically on the drive rod. Generally, it is sufficient to provide two in the 180 degree direction. However, if there are three existing piles, three are provided every 120 degrees.
When folding an existing pile, the drive rod is bent and easily tilted. When the drive rod is tilted, the pressure contact force between the pressure contact member of the grip mechanism and the inner peripheral surface of the casing tube is reduced, and slippage occurs.
[0011]
Therefore, as described in claim 4, it is desirable to fix a stabilizer having a slight gap between the inner diameter of the casing tube on the upper side and the lower side of the grip mechanism to limit the inclination of the drive rod.
Moreover, since the resistance at the time of press-fitting of the inverted wing is large when the earth and sand are hard, it is desirable to loosen the earth and sand around the existing pile in advance. As described in claim 2, this means is a casing tube provided with a spiral rib on the inner peripheral surface, and is built with a rotary press-fitting device before the fallen wing is press-fitted, and the surrounding earth and sand are dusted. Good. Moreover, it is good to press-fit, swinging a casing tube small. Furthermore, press-fitting becomes easier if a drill bit is attached to the lower end of the folded blade.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the apparatus for implementing the removal method of the existing pile is demonstrated.
FIG. 1 shows an overall configuration of an apparatus for removing an existing pile, and shows a state in which a casing tube 5 is installed with a rotary press-fitting device 1 and a folding device is press-fitted into the casing tube 5.
[0013]
The rotary press-fitting device 1 includes an elevating frame 2 connected to elevating cylinders 4 provided at four corners of a base frame 3, and a rotating frame having a tapered hole through which a casing tube 5 is inserted is rotatable. It is supported. Then, a wedge member is inserted between the casing tube and the taper hole by a chuck cylinder connected to the upper frame 7 so that the rotating frame and the casing tube 5 are fastened.
[0014]
The erection is pushed into the ground while rotating the casing tube 5 by rotating the rotating frame by the motor 8 while the casing tube 5 is held by the rotating frame and lowering the elevating cylinder 4.
The casing tube 5 has a drilling bit 5a fixed at the lower end, and a spiral rib 5b attached to the inner periphery of the lower part.
[0015]
The folding device includes a grip mechanism 10 and a drive rod 20 having a folding blade 21 fixed to the lower portion, and the upper end of the drive rod 20 is fixed to the lower end of the grip mechanism 10. The folding device is suspended by the crawler crane 30 via the swivel joint 27. In addition, 25 is a joint and 26 is a swivel link.
[0016]
As shown in FIG. 2, the grip mechanism 10 includes an upper connecting member 12 having a shaft 11 fixed to a lower portion, a lower connecting member 13 into which the shaft 11 is slidably fitted, and an inner peripheral surface of the casing tube 5. And a plurality of pressure contact members 14 that are in pressure contact with each other, and links 15a, 15b, and 15c that connect the upper connection member 12 and the lower connection member 13 to the pressure contact member 14. In FIG. 2, the left half shows a state where the pressure contact member 14 is locked to the inner peripheral surface of the casing tube 5, and the right half shows a state where the pressure contact member 14 is separated from the inner peripheral surface of the casing tube 5. Show.
[0017]
The link 15a is attached while being inclined downward from the upper connecting member 12, and the links 15b and 15c are attached while being inclined upward from the lower connecting member 13.
A joint 25 is fixed to the upper end of the upper connecting member 12 and is connected to a swivel joint 27 via a swivel link 26. Further, on the side of the upper end of the upper connecting member 12, there are attached stabilizers 18a in which blades having a slight gap from the inner peripheral surface of the casing tube 5 are fixed at four locations on the circumference. Further, a flange 13 a for attaching the drive rod 20 is fixed to the bottom of the lower connecting member 13.
[0018]
The drive rod 20 has a cylindrical shape and is provided with a flange 20a attached to the flange 13 of the grip mechanism 10 at the upper end, and a folded wing 21 is fixed at the lower part. Reference numeral 18b denotes a stabilizer which is the same as the stabilizer 18a.
Two folding wings 21 are provided symmetrically in the left-right direction. In this embodiment, the folded wings 21 are integrated, and have a generally rhombus shape as a whole. And the lower end part is made into the shape sharpened below. Further, a plurality of mounting holes 21 a for fixing the excavation bit 22 are provided at the lower end of the folded blade 21.
[0019]
When the folding device is suspended in the casing tube 5, the distance between the upper coupling material 12 and the lower coupling material 13 is increased by the weight of the lower coupling material 13, the drive rod 20 and the folding blade 21 of the grip mechanism 10. The inclination angle of 15a-15c becomes large, and the press-contacting member 14 will be in the state which contracted (right state of FIG. 2). Therefore, the inside of the casing tube 5 can be freely moved up and down.
[0020]
When the folding device contacts the bottom of the hole, as shown on the left side of FIG. 2, the upper connecting member 12 is lowered by its own weight, the interval between the upper connecting member 12 and the lower connecting member 13 is reduced, and the links 15a to 15c are horizontal. As a result, the pressure contact member 14 is expanded. Thereby, the pressure contact member 14 is in pressure contact with the inner peripheral surface of the casing tube 5.
[0021]
Next, a method for removing an existing pile by the apparatus configured as described above will be described with reference to FIG.
First, the rotary press-fitting device 1 is installed at a position where the existing pile 9 is buried. In this case, the existing pile 9 is not positioned at the center of the casing tube 5. When there are a plurality of existing piles 9, the center of the casing tube 5 is positioned in the center between the existing piles 9.
[0022]
For example, when there are two existing piles 9, the casing tube 5 is installed such that the center of the casing tube 5 is located at the center between the two existing piles 9 as shown in FIG.
Then, the casing tube 5 is pushed in while being rotated by the rotary press-fitting device 1. At this time, the earth and sand in the casing tube 5 is loosened by the spiral rib 5b attached to the lower part of the casing tube 5.
[0023]
Once the casing tube 5 is built once deep into the ground, it is pulled up to the vicinity of the upper end of the existing pile 9.
Next, the hammaglab 31 suspended from the crawler crane is inserted into the casing tube 5 and the soil is discharged to the extent that the head of the existing pile 9 comes out as shown in FIG.
[0024]
Next, the folding device is hung on the crawler crane, inserted into the casing tube 5, and lowered so that the direction of the folded blade 21 is substantially perpendicular to the existing pile 9. When the tip of the folded wing 21 comes into contact with the ground, the pressure contact member 14 of the grip mechanism 10 expands and presses against the inner peripheral surface of the casing tube 5.
[0025]
Next, the casing device 5 is press-fitted with the tubing device 1 while being swung in small increments at an angle in a range where the folded wing 21 does not hit the existing pile 9. As shown in FIG. 4 (c), the inverted wing 21 is pushed together with the casing tube 5 while loosening the soil and loosening it. When the ground is hard, a plurality of excavation bits 22 are attached to the lower end of the folded wing 21.
[0026]
When the excavating blade 21 is pushed to an appropriate depth, the press fitting of the casing tube 5 is stopped and the casing tube 5 is gradually swung at a large angle. As a result, the folded wing 21 abuts against the existing pile 9 and folds it. Finally, by rotating the entire circumference, the reinforcing bars and the like inside the existing pile 9 can be completely cut.
[0027]
When the inverted wing 21 is rotated, the drive rod 20 tends to tilt due to the resistance of the earth and sand or the existing pile 9, but is regulated by the stabilizers 18a and 18b. Accordingly, it is possible to prevent the pressure contact force of the pressure contact member 14 locked to the inner peripheral surface of the casing tube 5 from being weakened.
[0028]
Next, as shown in FIG.4 (d), the folding apparatus is pulled up, the hummaglab 31 is suspended, and the existing pile 9 folded over is discharged | emitted with earth and sand.
When the existing pile and earth and sand for the length of the casing tube 5 have been discharged, the casing tube 5 is added to the upper end of the casing tube 5 and the above operation is repeated to remove the entire existing pile 9.
[0029]
【The invention's effect】
As described above, the device for removing an existing pile according to the present invention has a casing rod mounted on the inner peripheral surface of the casing tube at the lower end after the casing tube is built so that the existing pile is off the center. The folding device fixed to the lower end of the grip mechanism to be locked is suspended with a crane and inserted into the casing tube, and the folded wing is press-fitted with a rotary press-fitting device and rotated to contact an existing pile , Since this is folded down and the existing pile that has been folded is discharged with a hammaglab, the existing pile can be cut out and removed with a certain length, and work efficiency is good. In addition, noise is not generated as in the conventional case where the existing pile is crushed with a chisel and discharged with a hammaglab, and this is particularly effective for removal of existing piles in urban areas.
[Brief description of the drawings]
FIG. 1 is an overall view of an apparatus for carrying out an existing pile removing method of the present invention.
FIG. 2 is a side view showing details of the grip mechanism.
3A and 3B show details of the inverted wing, in which FIG. 3A is a front view and FIG. 3B is a side view.
FIG. 4 is a state diagram showing a method for removing the existing pile.
FIG. 5 is a schematic view showing a state in which an existing pile is removed by a crawler crane equipped with a conventional grab hammer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rotary press-fit apparatus 2 ... Elevating frame 3 ... Base frame 4 ... Elevating cylinder 5 ... Casing tube 5a ... Excavation bit 5b ... Rib 7 ... Upper frame 8 ... Motor 9 ... Existing pile 10 ... Grip mechanism 11 ... Shaft 12 ... Upper connection Material 13: Lower connecting member 13a ... Flange 14 ... Pressure contact member 15a ... Link 15b, 15c ... Link 18a, 18b ... Stabilizer 20 ... Drive rod 20a ... Flange 21 ... Folding blade 21a ... Mounting hole 22 ... Drilling bit 25 ... Joint 26 ... Swivel link 27 ... Swivel joint 30 ... Crawler crane 31 ... Hanmag love

Claims (4)

In the method of removing the existing pile by installing the casing tube with the rotary press-fitting device so as to surround the existing pile,
After installing the casing tube so that the existing pile is off the center, the folding device fixed to the lower end of the grip mechanism that locks the drive rod with the folding blade on the lower end to the inner peripheral surface of the casing tube inserted into the casing tube hung by a crane, in contact with the existing pile is rotated and pressed on a rotary press fit device該倒Oritsubasa, which was倒折, discharged existing pile倒折in Hanmagurabu A method for removing existing piles. The removal of the existing pile according to claim 1, wherein a spiral rib for loosening earth and sand is attached to the inner peripheral surface of the casing tube, and it is built with a rotary press-fitting device before press-fitting the inverted wing. Method. A grip mechanism that expands in the radial direction and engages with the inner peripheral surface of the casing tube, and a plurality of folded blades that are attached to the lower end of the grip mechanism and project in the radial direction of the casing tube and whose lower end direction is tapered The folding device for performing the removal method of the existing pile of Claim 1 characterized by consisting of the drive rod fixed to this. 4. The folding device according to claim 3, wherein a stabilizer having a slight gap with an inner peripheral surface of the casing tube is fixed on an upper side and a lower side of the grip mechanism.

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