JP2022135845A - Underground pile circumference excavation, and crushing underground pile pull-out mechanism, and crushing underground pile pull-out method using the mechanism - Google Patents

Abstract

To provide means for safely and reliably pulling out an underground pile even when it is difficult to hook a sling wire on the pile and pull out the pile.SOLUTION: An upper cylinder and a lower cylinder are provided by vertical opening, both of the cylinders are combined so that the upper cylinder is rotatable within a predetermined range along the lower cylinder, an outer peripheral surface of the upper cylinder is provided with a pressing claw for pressing and holding an outer peripheral surface of an underground pile so that it is rotatably pivoted on the outer surface of the upper cylinder by proper means, a proper place of the upper cylinder is provided with a cut part, the pressing claw tip is made to finely project to the inner part of the upper cylinder from the cut part end, a proper place of the outer peripheral surface of the upper cylinder is provided with a recess having a predetermined width, a projecting stopper positioned in the recess is provided in a proper place of the lower cylinder, a lower end of the lower cylinder is projectingly provided with a plurality of blade parts for excavation, so that the underground pile circumference can be excavated by rotation in a clockwise direction in plan view of both of the vertical cylinders, an underground crushing pile can be pressed and held by the pressing claws due to rotation in a counterclockwise direction in plan view, and a rotation range of the upper cylinder relative to the lower cylinder is regulated in a movable range of the stopper in the recess.SELECTED DRAWING: Figure 11

Description

The present invention relates to an excavation function around an underground pile, a mechanism for extracting a crushed underground pile, and a method for extracting a crushed underground pile using the mechanism.

Conventionally, there are mechanisms and construction methods for pulling out underground piles using mechanical devices, but as shown in the present invention, there is no method using pressing claws at present.

The conventional method described above has the following problems.
1. Because the method is to wire the piles, small pieces of piles cannot be pulled out and removed.
2. It is not possible to confirm that the pile is left in the ground and becomes a small piece.
3. A large-sized device using a hydraulic cylinder or the like is required.
SUMMARY OF THE INVENTION In view of the above, the present invention has been made to solve the above problems.

As means for solving the problems, the present invention has the following configuration. That is, one of the present invention is
An upper cylinder and a lower cylinder are provided by opening the top and bottom, and the upper cylinder is combined with the above two cylinders so that the upper cylinder can rotate within a predetermined range along the lower cylinder. A pressing pawl for pressing and holding is rotatably supported on the outer surface of the upper cylinder by an appropriate means, and a cutting portion is provided at an appropriate place on the upper cylinder, and the tip of the pressing claw extends from the end of the cutting portion toward the inside of the upper cylinder. On the other hand, a concave portion with a predetermined width is provided at an appropriate place on the outer peripheral surface of the upper cylinder, a convex stopper located in this concave portion is provided at an appropriate place on the lower cylinder, and a blade for excavating soil is provided at the lower end of the lower cylinder. By providing a plurality of protrusions, it is possible to excavate the periphery of the pile by the pressing claws by rotating both the upper and lower cylinders in the clockwise direction in plan view, and by rotating in the counterclockwise direction in plan view, the pile circumference can be excavated by the pressing claws. It is characterized in that it is possible to press and hold crushed piles in the ground by pressing claws, and that the range of rotation of the upper cylinder with respect to the lower cylinder is regulated by the movable range of the stopper in the recess. It is an underground pile circumference excavation and crushed underground pile extraction mechanism.

Another aspect of the present invention is
1. The first step is to excavate the ground above the buried underground pile to expose the pile head.
2. The second step is to move the pile extraction machine to the pile position and cure the scaffolding.
3. The third step is to install the auger casing around the pile and check its verticality.
4. The fourth step is to excavate the circumference of the pile while spraying water from the lower end of the auger casing.
5. The fifth step is to confirm the end cutting between the pile and the underground surface while confirming the excavation depth.
6. The sixth step is to pull up the auger casing from the ground.
7. The seventh step is to set the slinging wire to the lower end of the auger casing, drop it into the ground, confirm that the wire is hooked to the stake, and pull out the underground stake.
8. When the underground pile is crushed and it is difficult to pull out the pile by wire hooking, the mechanism for excavating around the underground pile and pulling out the crushed underground pile shown in claim 1 is rotated counterclockwise, The eighth step of pulling up to the ground while holding the crushed pile with the pressing claws.
9. A ninth step of backfilling the hole after the extraction.
This is a crushed underground pile extraction method using a mechanism for extracting crushed underground piles and excavating around the circumference of underground piles, which is characterized by the steps described above.

The present invention has the following effects.
1. It is possible to pull out crushed underground piles, which are difficult to pull out by the conventional method of directly hooking wires to underground piles.
2. The opposing pressing claws come into pressing contact with the side surface of the crushed underground pile, so that the crushed underground pile can be held and pulled out safely and reliably.
3. Since the cutting edge for excavation is provided at the lower end of the lower cylinder, this mechanism can perform both underground excavation and pulling up of crushed underground piles.

Pile extraction procedure flow chart of conventional example Explanatory diagram of conventional pile extraction procedure 1 is a plan view of a mechanism for excavating around an underground pile and extracting crushed underground piles according to the present invention; FIG. 1 is a front view of a mechanism for excavating around an underground pile and extracting crushed underground piles according to the present invention; FIG. Explanatory drawing (plan view) of pressing claw projection in the underground pile peripheral excavation and crushing underground pile extraction mechanism of the present invention FIG. 2 is a right side view of the underground pile perimeter excavation and crushing underground pile extraction mechanism of the present invention. Explanatory drawing of position change of pressing claw used in the present invention Explanatory drawing of the positional relationship of each tube of the underground pile circumference excavation and crushed underground pile extraction mechanism of the present invention (AA cross section, partially omitted) Explanatory drawing of water pipe position change in underground pile perimeter excavation and crushing underground pile extraction mechanism of the present invention Fractured underground pile extraction procedure flow chart of the present invention Explanatory drawing of extraction procedure of crushed underground pile of the present invention

Embodiments of the present invention will be described below. Prior to describing the present invention, conventional means will be described first.
Ground pile extraction procedure by conventional means:
1. Ground excavation and relief core set (Fig.2-a, b)
Excavate the ground above the pile with a backhoe to expose the pile head. If there is a risk that the core of the pile will be unknown, provide two or more escape cores. If there is a risk of ground collapse, install a fall prevention fence, install a standpipe (a formwork for preventing heavy machinery from overturning), and then backfill the ground.
2. Installation of the pile extractor Move the pile extractor to the position for extracting the pile and cure the scaffolding. At this time, the position of temporary placement of piles, the order of construction, the location of residue disposal, etc. will be confirmed.
3. Auger casing erection (Fig. 2-c)
Install the auger casing around the pile and check its verticality from two directions.
Check the connections of hydraulic hoses, water jet hoses, etc.
4. Excavation (Figure 2-c, d)
Water is jetted out from the lower end of the casing, and excavation is carried out at a speed suitable for the resistance of the underground pile and soil quality.

5. Check the end cut between the pile and the ground (Fig. 2-d)
While confirming the excavation speed, the end cutting is confirmed by the behavior and rotation of the pile.
6. Casing up (Fig.2-e)
If there is a danger of falling soil adhering to the auger casing, remove it during lifting.
7. Extraction of underground piles (concrete piles) (Fig. 2-f, g)
A slinging wire is set at the lower end of the casing, and the slinging wire is dropped to a position where the pile can be pulled out safely.
After pulling out the casing and confirming that the wire is securely hooked to the pile, the pile is gradually pulled out. If the pile is cut in the middle and remains in the ground, wire it again while checking the depth and pull it out.
8. Curing of borehole (Fig. 2-h)
Backfill the sand with a backhoe.
The above process is performed for each pile.

Next, the underground pile perimeter excavation and crushed underground pile extraction mechanisms used in the present invention will be described.
In the figure, 1 is a lower cylinder made of metal, and has a stepped portion 2 on the lower outer periphery thereof, and a pair of insertion holes 3 for water pipes are formed in a part of the stepped portion 2 in a symmetrical manner in a plan view. there is Further, as shown in FIGS. 4 and 6, stoppers 4 formed of angular projections are provided on the outer peripheral surface of the lower cylinder at four equal intervals in a plan view. An upper cylinder 10 is made of metal and has an outer stepped portion 11 and an inner stepped portion 12 as shown in FIG. A thick portion 13 is formed at the lower portion of the upper cylinder at the outer step portion.
A stopper restricting portion 14 formed by a substantially rectangular through hole is provided at an appropriate place of this thick portion, and the stopper is positioned within this stopper restricting portion.

As shown in the figure, the stopper and the stopper restricting portion are divided into an upper position and a lower position, and each pair is positioned symmetrically in a plan view. In addition, a locking recess 15 is formed in a part of the stopper restricting portion which is lowered by one step. Denoted at 16 is a claw protector for protecting the pressing claw, which will be described later, and is a frame-shaped member which projects slightly outward from the outer periphery of the thick portion.
Reference numeral 17 denotes a plate-like pressing claw when viewed from the front. As shown in FIG. 7, this pressing claw has a through hole at its thick base and a smooth thin tip.
The height of the pressing pawl is such that it can be accommodated in the pawl protector, and a shaft is inserted into the through hole. is rotatable. Also, a rectangular cutout (not shown) of a predetermined size is formed at an appropriate place on the upper cylinder, and the vicinity of the tip of the pressing claw comes into contact with the end of the cutout and protrudes slightly inward.

Therefore, when the upper cylinder rotates counterclockwise with respect to the lower cylinder, as shown in FIG. 7, the pressing claws dig into the soil in the lower cylinder and protrude inward of the upper cylinder. . The rotation range of the upper cylinder with respect to the lower cylinder is such that the stopper can move within the range of the stopper limit frame, and this determines the rotation range of the pressing claw, that is, the range of the projection distance inward of the upper cylinder. .
Reference numeral 20 denotes rod-shaped water tube protectors provided at positions extending from the upper end of the upper cylinder to the outer step to protect the water tube, and a pair of water tube protectors are provided at a distance parallel to each other.
Reference numeral 21 denotes a water pipe lower protective portion formed from the upper end to the lower end of the thick portion of the upper cylinder, and is a portion cut from the thick portion so that the upper portion is narrower and the lower portion is wider.
A water pipe 22 has an upper water pipe 22a positioned between the water pipe protectors, a lower water pipe 22b positioned between the water pipe lower protection parts, a further lower part of the water pipe positioned in the water pipe insertion hole 3, and a lower end of the water pipe. It is positioned slightly above the lower end of the lower cylinder. The upper end of the water pipe is a metal pipe, and the lower end of the water pipe is formed of a flexible member such as a rubber tube. A water pipe protection cover 23 may be provided on the lower cylinder.

The rotation range of the pressing claw is determined by the movable range of the stopper as described above. Since the lower part of the water tube is positioned by the lower cylinder, an angular movement occurs between the upper part and the lower part of the water tube when the upper cylinder rotates.
In order to absorb this, the lower part of the water tube is made of a rubber tube, and a water tube lower part protection part is provided to protect the lower part of the water tube. A plurality of cutting edge portions 30 are provided at the lower end of the lower cylinder so as to protrude downward.

Next, the functions and actions of this mechanism will be described.
First, the upper cylinder of the present invention is fixed to the lower end of the auger casing described above by appropriate means.
Also, the upper end of the water pipe is connected to the water supply section. Next, the auger drives the casing and the upper and lower cylinders to rotate clockwise in plan view, and the cutting edge at the lower end of the lower cylinder starts excavating the circumference of the pile, and water is sprayed from the lower end of the water pipe. Continuing this, the drilling mechanism and casing of the present invention move downwards through the earth. When the excavation around the pile is completed, the auger casing is moved upward, and then the pile is pulled out from the ground by entwining the rope with a ring-shaped tip and moving it upward. When this pile is crushed and separated into upper and lower piles, the upper pile can be pulled out with a rope, but the lower pile remains in the soil. Therefore, when the auger casing is inserted into the hole after the pile has been removed and then the casing is rotated counterclockwise in plan view, the pressing claw protrudes inward of the upper cylinder to press and hold the outer periphery of the pile, as described above. Therefore, by moving the casing upward as it is, the piles remaining after the crushing can be pulled out of the ground and disposed of.

If a stone or other object hits the blade during excavation and it becomes difficult to proceed with the excavation, the upper cylinder can be moved slightly upward, and the stopper will enter the lock recess and rotate clockwise and counterclockwise. It is possible to alternately rotate in both directions to remove obstacles to excavation. After that, drilling can proceed as before.

Next, a crushed underground pile extraction method using the underground pile periphery and the crushed underground pile extraction mechanism according to the present invention will be described.
1. Ground excavation, confirmation of pile head, escape core set (Fig. 11-a, b)
Excavate the ground with a backhoe to expose the pile head. Considering the presence or absence of tipping of the pile head, if there is a risk that the pile core will be unknown, install two or more escape cores. If there is a risk of ground collapse, install a fall prevention fence and backfill the ground after installing the standpipe.
2. Installation of the pile extractor Move the pile extractor to the position for removing the pile and cure the scaffolding. At this time, confirm the temporary placement position of the piles, construction order, surplus soil disposal site, etc.
3. Auger casing erection (Fig. 11-c)
While erecting the auger casing around the pile, check the verticality of the auger casing from two directions. Check the connections of the auger casing hydraulic hose, water jet hose, etc.
4. Excavation (Fig. 11-c)
Water is ejected from the tip of the auger casing, and excavation is performed at a speed suitable for the resistance of the underground pile and the soil quality.
5. Confirmation of end cutting with piles and ground (Fig. 11-d)
While confirming the excavation depth, the end cutting is confirmed by the behavior and rotation of the pile.
6. Casing up (Fig. 11-e)
If there is a danger of falling soil adhering to the auger casing, remove it when pulling up.

7. Extraction of underground pile (concrete pile) (7-1) (Fig. 11-f, g)
A slinging wire is set at the tip of the casing, and the pile is dropped to a position where it can be pulled out safely. After pulling out the casing and confirming that the wire is securely hooked to the pile, the pile is gradually pulled out. If the pile is cut in the middle and remains in the ground, wire it again and pull it out while checking the depth.
(7-2) (Fig. 11h-n)
If the concrete pile is crushed and it is difficult to pull it out with a wire, turn the casing clockwise again to drop it down to the bottom tip of the pile hole. After confirming the appropriate depth, reverse the casing (counterclockwise) and pull up while protruding the pressing claw inside.
After installing the tip of the casing on the ground, rotate it forward (clockwise) to retract the internal protrusion.
Raise the casing to drop and remove pile fragments and reinforcing bars inside the casing.
8. Curing of borehole (Fig. 11-p)
Backfill the sand with a backhoe. Each of the above steps is repeated for each pile.

The present invention has been described above, but unlike the conventional method of pulling out a slinging wire by hanging it on an underground pile, the present invention uses an underground pile circumference excavation and a crushed underground pile extraction mechanism to pull out a crushed pile. It has its characteristic in that it is pulled out.
As mentioned above, the conventional method involves hooking the slinging wire to the piles in the excavation hole and pulling them up after various preparations. It is not effective against piles. The slinging wire is lifted by hooking the ring-shaped portion, which tightens when pulled, to a stake, but the crushed portion collapses on this wire, making it difficult to lift.

On the other hand, as described above, the present invention has a system in which the pressing claws are brought into press contact with the outer surface of the pile, so that the crushed pile can be strongly pressed from the outside and pulled up while maintaining the shape of the pile. be. In addition, since the pressing is done by reversing (counterclockwise) the mechanism of the present invention, it is possible to pull up crushed underground piles, which was impossible with the conventional method.
In addition, as a procedure, the method of the present invention can be used after first performing the extraction by the conventional method and judging the condition of the pile. As described above, according to the present invention, a new and useful underground pile peripheral excavation and underground crushed pile extraction mechanism that enables pulling up of crushed underground piles, which was impossible with conventional methods, and crushed ground using this mechanism A medium pile extraction method can be obtained.

1 lower tube 2 stepped portion 3 insertion hole 4 stopper 10 upper tube 11 outer step 12 inner step 13 thick portion 14 stopper restricting portion 15 locking recess 16 claw protector 17 pressing claw 20 water tube protector 21 lower water tube protector 22 Water tube 22a Water tube upper part 22b Water tube lower part 23 Water tube protection cover 30 Cutting blade part 40 Auger 41 Casing

Claims (2)

An upper cylinder and a lower cylinder are provided by opening the top and bottom, and the upper cylinder is combined with the above two cylinders so that the upper cylinder can rotate within a predetermined range along the lower cylinder. A pressing pawl for pressing and holding is rotatably supported on the outer surface of the upper cylinder by an appropriate means, and a cutting portion is provided at an appropriate place on the upper cylinder, and the tip of the pressing claw extends from the end of the cutting portion toward the inside of the upper cylinder. On the other hand, a concave portion with a predetermined width is provided at an appropriate place on the outer peripheral surface of the upper cylinder, a convex stopper located in this concave portion is provided at an appropriate place on the lower cylinder, and a blade for excavating soil is provided at the lower end of the lower cylinder. By providing a plurality of protrusions, it is possible to excavate the circumference of the pile by rotating the upper and lower cylinders in the clockwise direction in plan view, and by rotating the pile in the counterclockwise direction in plan view, the soil by the pressing claws can be excavated. It is possible to press and hold the crushing pile inside, and the rotation range of the upper cylinder with respect to the lower cylinder is regulated by the movable range of the stopper in the recess. Pile perimeter excavation and crushed underground pile extraction mechanism. 1. The first step is to excavate the ground above the buried underground pile to expose the pile head.
2. The second step is to move the pile extraction machine to the pile position and cure the scaffolding.
3. The third step is to install the auger casing around the pile and check its verticality.
4. The fourth step is to excavate the circumference of the pile while spraying water from the lower end of the auger casing.
5. The fifth step is to confirm the end cutting between the pile and the underground surface while confirming the excavation depth.
6. The sixth step is to pull up the auger casing from the ground.
7. The seventh step is to set the slinging wire to the lower end of the auger casing, drop it into the ground, confirm that the wire is hooked to the stake, and pull out the underground stake.
8. When the underground pile is crushed and it is difficult to pull out the pile by wire hooking, the mechanism for excavating around the underground pile and pulling out the crushed underground pile shown in claim 1 is rotated counterclockwise, The eighth step of pulling up to the ground while holding the crushed pile with the pressing claws.
9. A ninth step of backfilling the hole after the extraction.
A crushed underground pile extraction method using a mechanism for extracting crushed underground piles and excavating around the circumference of underground piles, characterized by comprising the above steps.

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