JP2018115434A - Tool for pile extraction and pile extracting method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile extracting technique that is relatively simple and generally useable.SOLUTION: The purpose of this invention is achieved by a pile extracting tool which is prepared separately from a drilling casing. The pile extracting tool 1 has a cavity member 4 provided between the drilling casing 2 and a pile 3, and multiple chucking members 5 provided in a state extruding into the inside of the cavity member 4. The pile extracting tool 1 is structured such that it can hold the pile 3 by way of the chucking members 5 encroaching upon the pile 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pile extraction device used for pile removal and a pile extraction method using the same. More specifically, the present invention relates to a pile removing device that can hold a buried pile reliably and stably when a pile buried in the ground (buried pile) is pulled out, and a burial using the same. It relates to a method of pulling out piles.

  When removing an existing building, it is necessary to pull out the foundation pile (hereinafter referred to as “buried pile”) that supported the building as well as dismantling the building. In other words, pulling out buried piles increases the degree of freedom of land use, and usually increases the asset value of land. Thus, pile removal is an indispensable work when removing a building, and a safe and efficient pile removal method is required.

  As a pile removal method, a method of pulling out buried piles using a casing is generally used. In other words, after drilling the ground around the buried pile with a drilled casing, the buried pile is pulled out.

The drilled casing is a cylindrical steel pipe having a diameter larger than the diameter of the buried pile. While rotating this drilling casing and supplying water, we will dig the ground around the buried pile. Then, when the bottom of the buried pile is dug, the buried pile is pulled out.
Conventionally, as a method for pulling out the buried pile at this time, a technique of winding a wire or the like directly around the buried pile and a technique of pulling out the fixed pile together with a drilling casing are disclosed (Patent Documents 1 and 2). ).

JP 2000-154541 A JP2015-212464A

As described above, in the prior art, a technique is disclosed in which a buried pile is fixed and pulled out together with a drilling casing. Starting with the prior art, the method of fixing and pulling the buried pile together with the drilling casing is a useful method in that the ground drilling and the fixing of the buried pile can be performed with the same member.
However, in the case of such a technique, the hole casing itself must be provided with a function such as a fixing means, and as a result, the hole casing itself becomes large. For this reason, the work cannot be performed unless it is a large heavy machine, and there is a problem that it cannot be used under a narrow working condition in which a space cannot be secured. In addition, since the hole drilling casing itself has various functions such as fixing means, holes in hard ground are drilled, so there are problems such as failure and easy maintenance.

  In view of the above circumstances, an object of the present invention is to develop a technique for extracting buried piles that is relatively simple and highly versatile.

  As a result of diligent research, the inventor conceived a dedicated fixing device for fixing the buried pile separately from the drilled casing, and completed the invention of such a pile removal device and a pile removal method using the same. It is a thing.

The present invention has the following configuration.
A first configuration of the present invention includes a hollow member installed between a drilling casing and a buried pile, and a plurality of chucking members installed in a state of protruding into the hollow member, The pile removing device is characterized in that a chucking member holds the buried pile by biting into the buried pile.

  A second configuration of the present invention is the pile removing device according to the first configuration, wherein the hollow member is formed in a substantially cylindrical shape having both end openings.

According to a third configuration of the present invention, the chucking member includes a chucking plate that plays a role of biting into the buried pile, and a pair of rib plates for installing the chucking plate. Is a pile removing device according to the first or second configuration, wherein the pile removing device is rotatably supported in a form sandwiched between the pair of rib plates.
A fourth configuration of the present invention is the pile removing instrument according to the third configuration, wherein the tip of the chucking plate is formed in an R (round) shape.
A fifth configuration of the present invention is the pile removing device according to the third or fourth configuration, wherein the tip of the chucking plate is meshed.
A sixth configuration of the present invention is the pile removing instrument according to the third to fifth configurations, further comprising a bracket plate rotatably supported at a rear end of the chucking plate. is there.
According to a seventh configuration of the present invention, a through-hole for penetrating the chucking plate is provided on a side surface of the hollow member, and the chucking plate penetrates the through-hole, and the inside of the hollow member. The pair of rib plates are supported by the chucking plate so as to be rotatable by bolts, and the bracket plate is supported by the chucking plate so as to be rotatable by bolts outside the hollow member. It is the instrument for pile extraction as described in the 6th structure characterized by the above-mentioned.

  The 8th structure of this invention is a pile extraction method characterized by drawing out an embedded pile using the pile extraction instrument as described in a 1st-7th structure.

  According to the present invention, it has become possible to provide a technique for extracting buried piles that is relatively simple and highly versatile.

The longitudinal cross-sectional view which shows the use condition of the instrument for pile extraction in one embodiment of this invention (state before hold | maintaining a buried pile) Sectional view taken along line II-II in FIG. Sectional view taken along line III-III in FIG. The longitudinal cross-sectional view (state which hold | maintained the buried pile) which shows the use condition of the instrument for pile extraction in one embodiment of this invention 4 is a cross-sectional view taken along line VV in FIG. Sectional view taken along line VI-VI in FIG. The longitudinal cross-sectional view which shows the hollow member which is a structural member of the instrument for pile extraction in one embodiment of this invention The front view which shows the chucking plate which is a structural member of the instrument for pile extraction in one embodiment of this invention The front view (outside) which shows the rib plate which is a structural member of the instrument for pile extraction in one embodiment of this invention The rear view which shows the rib plate which is a structural member of the instrument for pile removal in one embodiment of this invention (opposite side with a chucking plate) A six-sided view showing the state in which the chucking plate is rotatably supported inside the hollow member between the pair of rib plates (the rear view is omitted) The front view which shows the bracket plate which is a structural member of the instrument for pile extraction in one embodiment of this invention FIG. 6 is a six-sided view showing a bracket lid that is a constituent member of a pile removing device according to an embodiment of the present invention (the rear view, left side view, and bottom view are omitted) Six-sided view showing bracket plate with bracket lid, bolts and nuts attached (rear view omitted) The perspective view which looked at the state which drilled the ground around an embedding pile with the drilling casing from the slanting upper part The perspective view which looked at the state which installed the instrument for pile removal in one embodiment of this invention between the drilling casing and the buried pile from diagonally upward The perspective view which looked at the state which installed the instrument for pile removal in one embodiment of this invention between the drilling casing and the buried pile from diagonally upward Perspective view showing the state of the ground before pulling out the buried pile The perspective view which looked at the state of the underground before pulling out the buried pile from diagonally above Perspective view showing the state of the ground with the buried pile pulled out Perspective view showing the state of the ground with the buried pile pulled out

  Hereinafter, the present invention will be described more specifically with reference to preferred embodiments. However, the following embodiment is merely an example embodying the present invention, and the present invention is not limited to this.

<< I. Overview of pile removal equipment >>
The pile removing instrument of the present invention comprises a hollow member installed between the drilled casing and the buried pile, and a plurality of chucking members installed in a state of protruding inside the hollow member, The chucking member holds the buried pile by biting into the buried pile.

The hollow member includes a chucking member and is a member installed around the buried pile. In addition, the hollow member has a certain length and strength so that it can be pulled out stably when the buried pile is pulled out. The hollow member is not particularly limited as long as it fulfills these roles and functions, and can have various shapes or configurations.
As the hollow member, typically, a substantially cylindrical metal member having both ends opened as shown in FIGS. 7 and 17 may be used.

In the present invention, the hollow member preferably includes a through hole for allowing a chucking plate, which will be described later, to pass therethrough.
According to such a preferable configuration, the chucking plate can be installed without using screws or the like, the position of the chucking plate can be changed by gravity, and the performance of the pile removing instrument of the present invention can be improved. The effect of being able to be obtained.
The shape of the through hole may be a rectangular shape as shown in FIG. In this case, the width of the through hole may be approximately the same as the thickness of the chucking plate, and the length may be slightly shorter than the length of the chucking plate.

  The chucking member is provided in the hollow member, and plays a role of holding the buried pile by its front end biting into the buried pile. The chucking member is not particularly limited as long as it plays such a role, and various shapes or configurations can be adopted.

The chucking member includes a chucking plate that plays a role of biting into the buried pile and a pair of rib plates for installing the chucking plate, and the chucking plate is sandwiched between the pair of rib plates. Therefore, it is preferably supported so as to be rotatable.
According to such a preferable configuration, it is possible to exhibit a sufficient function while making the chucking member a relatively simple configuration, and it is possible to improve the performance and handleability of the pile removing instrument of the present invention. Is obtained.

The chucking plate plays a role of biting into the buried pile, and is equipped with a rib plate and bracket plate that are pivotally supported at the front and back of the chucking plate, so that its position and orientation can be changed through the through hole. To play a role. The chucking plate is not particularly limited as long as it plays such a role, and various shapes or configurations can be adopted.
As the chucking plate, typically, a metal member having a substantially trapezoidal shape having a circular hole or an R-shaped tip as shown in FIG. 8 may be used.
In the present specification, for the sake of convenience, the end of the chucking plate on the inner side of the hollow member (the side that bites into the buried pile) is defined as the “front end”, and the outer end of the hollow member is defined as the “rear end”.

The chucking plate is preferably provided with a mesh processing at the tip.
According to such a preferable configuration, when the chucking plate bites into the buried pile, it has resistance, and the effect that the holding of the buried pile by the chucking plate can be stabilized can be obtained.

The rib plate prevents the chucking plate from coming out of the through hole, and stabilizes the position of the chucking member when holding and fixing the buried pile. The rib plate is not particularly limited as long as it plays such a role, and various shapes or configurations can be adopted.
As the rib plate, typically, a substantially trapezoidal metal member having a circular hole as shown in FIGS. 9 to 10 may be used. In other words, the pair of rib plates may be rotatably supported by the tip of the chucking plate by bolts through the circular holes.
It is preferable that the rib plate has a mesh processing on the bottom of the substantially trapezoidal shape.
According to such a preferable configuration, it is possible to increase the resistance in contact between the bottom of the rib plate and the inner wall of the hollow member when holding and fixing the buried pile, and as a result, the holding force and stability can be improved. An effect is obtained.

The bracket plate serves to prevent the chucking plate from coming out of the through-hole and to have a bracket lid for attaching a rod-shaped member (Kevin rod) or the like for moving the cavity member up and down. The bracket plate is not particularly limited as long as it plays such a role, and various shapes or configurations can be adopted.
As the bracket plate, typically, a rectangular metal member having a circular hole as shown in FIG. 12 may be used. That is, the pair of bracket plates may be configured to be rotatably supported on the rear end portion of the chucking plate by bolts through the circular holes.

The bracket lid is fixed to the bracket plate and plays a role for attaching a rod-shaped member (Kevin rod). The bracket lid is not particularly limited as long as it plays such a role, and various shapes or configurations can be adopted.
As the bracket lid, typically, one having a shape (made of metal) having a female screw hole for screwing a rod-shaped member (Kevin rod) into a rectangular member as shown in FIG. 13 is used. Good.

<< II. Embodiment >>
<Configuration of pile removal tool>
First, the configuration of a pile removing device according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a longitudinal sectional view (a state before holding an embedded pile) showing a use state of an instrument for pile removal according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1, FIG. 4 is a vertical cross-sectional view showing the usage state of the pile removal tool (with the embedded pile held), and FIG. FIG. 6 is a sectional view taken along the line VI-VI in FIG. 4, FIG. 7 is a longitudinal sectional view showing a hollow member that is a constituent member of the pile removing instrument, and FIG. 8 is a configuration of the pile removing instrument. 9 is a front view showing a chucking plate as a member, FIG. 9 is a front view (outside) showing a rib plate as a constituent member of the pile removing instrument, and FIG. 10 is a rear view showing the rib plate (with a chucking plate). FIG. 11 shows that the chucking plate is sandwiched between a pair of rib plates inside the hollow member so as to be rotatable. FIG. 12 is a front view showing a bracket plate which is a constituent member of the pile removing device, and FIG. 13 is a constituent member of the pile removing device. A six-sided view showing the bracket lid (rear view, left side view, and bottom view omitted), and FIG. 14 is a six-sided view showing the bracket plate with the bracket lid, bolts and nuts attached (rear view omitted). is there.

  As shown in FIG. 1 to FIG. 6, the pile removal tool 1 of the present embodiment protrudes into the cavity member 4 between the drilled casing 2 and the buried pile 3 and the cavity member 4. A plurality of chucking members 5 installed in a state. And the pile removal instrument 1 of this Embodiment is comprised so that the said embedded pile 3 can be hold | maintained and fixed when the chucking member 5 bites into the embedded pile 3. FIG.

  According to the configuration of the pile removal tool 1 of the present embodiment, when the buried pile 3 is pulled out, the hollow member 4 provided with the chucking member 5 is used to bury the buried pile 3. The pile 3 can be held and fixed. As a result, the perforated casing itself does not become large, so that a large heavy machine is not required, and it is possible to use it under narrow working conditions in which space cannot be secured. Therefore, if the pile removal tool 1 of the present embodiment is used, it is possible to provide a technique for pulling out buried piles that is relatively simple and highly versatile.

As shown in FIGS. 1 to 7, the cavity member 4 is formed in a substantially cylindrical shape with openings at both ends (see FIGS. 16, 17, 20, and 21). Further, on the side surface (circumferential surface) of the cavity member 4, four through holes 4 a are provided at approximately 90 ° intervals for allowing a later-described chucking plate 5 a that is a constituent member of the chucking member 5 to pass therethrough.
Here, the hollow member 4 has an outer diameter of 800 mm, an inner diameter of 776 mm, and a height of 1150 mm. The through hole 4 a has a width of 36 mm and a length of 250 mm, and the through hole 4 a is provided slightly below the center of the hollow member 4. The width of the through hole 4a is set to be substantially the same as the thickness of the chucking plate 5a, and the length is set slightly shorter than the length of the chucking plate 5a.

As shown in FIGS. 1 to 6 and FIGS. 8 to 11, the chucking member 5 includes a chucking plate 5a that plays a role of biting into the buried pile 3, and a pair of ribs for installing the chucking plate 5a. Plate 5b. And the front-end | tip part of the chucking plate 5a is supported by the volt | bolt 6a so that rotation is possible between the pair of rib plates 5b.
As shown in FIG. 1 to FIG. 6 and FIG. 12 to FIG. 14, the pile removing device 1 of the present embodiment is rotatably supported by a bolt 6b at the rear end portion of the chucking plate 5a. A pair of bracket plates 5c is further provided. A bracket lid 5e is fixed to the upper ends of the pair of bracket plates 5c for attaching a kevin rod 5d for moving the cavity member 4 up and down. In FIG. 12, reference numeral 5j denotes a bolt insertion hole formed in the lower end portion of the bracket plate 5c. 2, 5, 13, and 14, reference numeral 5 f indicates a female screw hole for screwing the lower end portion of the kevin rod 5 d.

Here, the chucking plate 5a is formed in a substantially inverted trapezoidal shape having a height of 98 mm and a length of 263 mm, and the tip is formed in an arc shape (R shape) having a curvature radius of 73 mm. In FIG. 8, reference numerals 5g and 5h denote bolt insertion holes formed in the front end portion and the rear end portion of the chucking plate 5a. The tip of the chucking plate 5a is meshed. Thereby, when the chucking plate 5a bites into the buried pile 3, it has resistance, and the holding of the buried pile 3 by the chucking plate 5a can be stabilized.
The rib plate 5b is formed in a substantially trapezoidal shape with a height of 102.5 mm and a length of 172.5 mm. In FIGS. 9 and 10, reference numeral 5i indicates a bolt insertion hole formed in the upper end portion of the rib plate 5b. Further, the rib plate 5b is meshed on the substantially trapezoidal bottom. This makes it possible to increase the resistance in contact between the bottom of the rib plate 5b and the inner wall of the hollow member 3 when holding and fixing the buried pile 3, and as a result, it is possible to improve holding force and stability. .

  More specifically, as shown in FIGS. 4, 11, and 14, the chucking plate 5 a passes through the through hole 4 a, and a pair of rib plates 5 b are formed inside the cavity member 4. The bracket plate 5c is rotatably supported by the chucking plate 5a with the bolt 6b outside the hollow member 4.

<How to use the pile removal tool (pile removal method)>
Next, a pile removing method for pulling out an embedded pile using the pile removing device according to one embodiment of the present invention will be described with reference to FIGS.

  FIG. 15 is a perspective view of the ground around the buried pile drilled by the drilling casing as seen obliquely from above, and FIGS. 16 and 17 show an embodiment of the present invention between the drilling casing and the buried pile. The perspective view which looked at the state which installed the tool for pile removal in a form from the slanting upper part, FIG. 18 is the perspective view which shows the state of the ground before pulling out a buried pile, FIG. The perspective view seen from diagonally upward, FIG.20 and FIG.21 are perspective views which show the state of the ground of the state which has extracted the buried pile.

First, as shown in FIG. 15, the ground around the buried pile 3 is drilled by the drilling casing 2. In other words, the ground around the buried pile 3 is dug while rotating the drilling casing 2 and supplying water.
Next, after digging to the periphery of the bottom of the buried pile 3 in this way, as shown in FIGS. 1 to 3, 16, and 17, the hollow member 4 is replaced with the drilling casing 2, the buried pile 3, Install between. Here, the upper end of the kevin rod 5d connected to the rear end portion of the chucking plate 5a via the bracket plate 5c and the bracket lid 5e is fixed to the front end portion of the crane 7a of the crane vehicle 7 via the connecting member 8. (See FIGS. 18, 20, and 21).

  Next, as shown in FIGS. 1 and 18, when the kevin rod 5d is pulled up by the crane 7a of the crane 7 (see arrows A, B, C in FIG. 1 and arrow F in FIG. 18), the chucking plate 5a Rotates around the bolt 6a (see arrows D and E in FIG. 1), and the tip of the chucking plate 5a bites into the buried pile 3 as shown in FIGS. Thereby, the buried pile 3 is held and fixed by the chucking plate 5a. Here, since the chucking plate 5a is meshed at the tip, the chucking plate 5a has resistance when the chucking plate 5a bites into the buried pile 3, and the buried pile 3 by the chucking plate 5a. Can be maintained stably.

  Finally, as shown in FIGS. 18 and 19, when the kevin rod 5d is pulled up as it is by the crane 7a of the crane 7 (see arrows F in FIG. 18 and arrows G, H, I, and J in FIG. 19). ), As shown in FIGS. 20 and 21, the buried pile 3 is pulled out from the ground.

  As described above, if the pile removal tool 1 of the present embodiment is used, the drilling casing itself does not become large, so a large heavy machine is not required and a narrow working condition in which a space cannot be secured. It is also possible to pull out buried stakes. In addition, since the drilling casing itself does not have various functions such as fixing means, failure or the like hardly occurs when drilling a hard ground, and maintenance is facilitated.

  In the above-described embodiment, an example is given in which four through holes 4a for allowing the chucking plate 5a to pass through are provided on the side surface (circumferential surface) of the cavity member 4 at intervals of approximately 90 °. Although described, the present invention is not necessarily limited to such a configuration. The number of through holes and chucking plates may be two, three, or five or more.

  Moreover, in the said embodiment, although the case where the rib plate 5b not fixed to the inner wall of the cavity member 4 was provided was described as an example, the present invention is not necessarily limited to such a configuration. The pair of rib plates may be fixed to the inner wall of the hollow member by welding or the like with the through hole interposed therebetween.

DESCRIPTION OF SYMBOLS 1 Pile extraction tool 2 Drilling casing 3 Embedded pile 4 Cavity member 4a Through hole 5 Chucking member 5a Chucking plate 5b Rib plate 5c Bracket plate 5d Kevin stick 5e Bracket lid 5f Female screw hole 5g, 5h, 5i, 5j Bolt Insertion hole 6a, 6b Bolt 7 Mobile crane 7a Crane 8 Connecting member

Claims (8)

A hollow member installed between the drilling casing and the buried pile, and a plurality of chucking members installed in a state of protruding inside the hollow member,
The pile removing device, wherein the chucking member holds the buried pile by biting into the buried pile.   The pile removing device according to claim 1, wherein the hollow member is formed in a substantially cylindrical shape with both ends opened. The chucking member is
A chucking plate that plays a role of biting into the buried pile,
A pair of rib plates for installing the chucking plate;
The pile removing tool according to claim 1 or 2, wherein the chucking plate is rotatably supported so as to be sandwiched between the pair of rib plates.   The pile removing device according to claim 3, wherein a tip of the chucking plate is formed in an R shape.   The pile removing device according to claim 3 or 4, wherein a mesh processing is applied to a tip of the chucking plate.   The pile removing device according to any one of claims 3 to 5, further comprising a bracket plate rotatably supported at a rear end of the chucking plate. A through hole for penetrating the chucking plate is provided on a side surface of the hollow member,
The chucking plate passes through the through hole;
Inside the hollow member, the pair of rib plates are rotatably supported by the chucking plate with bolts,
The pile removing device according to claim 6, wherein the bracket plate is rotatably supported by the chucking plate with a bolt outside the hollow member. The pile extraction method characterized by pulling out a buried pile using the pile removal instrument of any one of Claim 1 to 7.