JPH08199571A - Pile driver backstay assembly / disassembly jig - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the tubular member from rolling when tightening and loosening bolts and nuts, and to improve workability when assembling and disassembling the backstay. [Structure] A jig 21 for assembling and disassembling a backstay is provided on a jig main body 23 formed in an elongated flat plate shape, and a head 13A of two adjacent bolts 13 provided on the base end side of the jig main body. Engaging portion 23 having two engaging holes 24, 24 engaging with each other
And a grounding portion 25 located on the tip side of the jig body 22 and grounded to the ground G radially separated from the tubular member 11. Therefore, when tightening the bolts 13 to connect the tubular members 11, the two engaging bolts 13 and 13 on which the tubular member 11 is about to roll during tightening are engaged with the engaging portions 23. While engaging the dowel hole 24, the grounding portion 25
When the cylinder member 11 is grounded on the ground G, the cylindrical member 11 is prevented from rolling by the jig 21, and is prevented from rotating by the engagement between the bolts 13 and the engaging portions 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backstay assembly / disassembly jig for a pile driver, which is suitable for assembling and disassembling a backstay for a pile driver.

[0002]

2. Description of the Related Art Generally, a pile driving machine is used to drive a foundation pile or the like at a construction site. The pile driving machine is attached to a base and a base, and a leader and a leader are selectively attached to the leader. A pile driving machine main body composed of an earth auger device and a hammer device, and a back provided between the pile driving machine main body and a base for holding the pile driving machine main body in a working position in which the leader stands upright. It is generally composed of stays, and a pile driver of this type is known, for example, from Japanese Patent Laid-Open No. 5-179643.

A pile driver constructed in this way is
Support the leader upright with the back stay, first attach the earth auger device to the leader and dig a hole in the ground,
Next, a hammer device is attached to the reader instead of the earth auger device, and a foundation pile or the like is driven into a hole excavated by the earth auger.

Here, the backstay is formed in a long shape by connecting a plurality of tubular members in the axial direction, and each tubular member has a large diameter having flange portions at both ends. They are formed in a cylindrical shape, and are connected by fastening with a plurality of sets of bolts and nuts that abut each other. Then, the back stay is disassembled into each tubular member during transportation of the pile driver, and can be reassembled on site.

Therefore, the procedure of assembling the back stay will be described. The flange portions of the tubular members are made to abut against each other in the axial direction, and in this state, a plurality of bolts and nuts are attached over the flange portions, Connect the tubular members by tightening the bolts and nuts with a tool such as a wrench,
By repeating this operation several times, a back stay composed of a plurality of tubular members and the like is assembled.

Further, when tightening the above-mentioned bolts and nuts, it is necessary to apply a large tightening torque, and since the cylindrical tubular member tries to roll due to the torque at this time, the tubular member rolls. The timber is applied to the person who is trying to do the tightening work. When disassembling the backstay, the same work may be performed in the reverse order.

[0007]

By the way, according to the above-mentioned prior art, by applying a square member to the tubular member at the time of assembling and disassembling the back stay, when the bolts and nuts are tightened or loosened, the cylinder is closed. The rolling member is prevented from rolling.

However, since the bolts and nuts are designed to be tightened with a large tightening torque, when the bolts and nuts are tightened and loosened, slippage occurs between the tubular member and the square bar, and the tubular member is It causes rotation on the spot.
As a result, no torque is applied to the bolts and nuts,
There is a problem that disassembling work requires a lot of time and labor.

The present invention has been made in view of the above-mentioned problems of the prior art. It is possible to effectively prevent the tubular member from rolling when the bolts and nuts are tightened or loosened, and to assemble or disassemble the back stay. It is an object of the present invention to provide a backstay assembling / disassembling jig for a pile driving machine, which is capable of significantly improving workability when shaving.

[0010]

In order to solve the above-mentioned problems, a backstay assembling / disassembling jig of a pile driving machine according to a first aspect of the present invention comprises a base and a pile driving attached to the base. It is formed to be long by connecting the machine body and a plurality of cylindrical members in the axial direction, and is provided between the pile driver body and the base in order to hold the pile driver body in the working position. A jig for backstay assembling / disassembling of a pile driver, comprising a jig main body formed in the shape of an elongated flat plate, and the cylindrical shape provided on the base end side of the jig main body. An engaging portion that is arranged on the outer peripheral side of the tubular member and that engages with at least one bolt or nut of each of the bolts and nuts when connecting the members with a plurality of bolts and nuts; A position that is provided on the tip side of the jig body and is separated from the tubular member in the radial direction. Formed by composed of a ground unit that ground.

Further, as in the invention of claim 2, a plurality of bolt insertion holes through which the bolts are inserted are formed in each of the tubular members, and the engaging portion has a space between the bolt insertion holes. A width dimension larger than the above may extend in the circumferential direction of the tubular member.

Further, as in the invention of claim 3, at least one or more engaging holes for engaging with the bolt or the nut may be formed in the engaging portion.

According to a fourth aspect of the present invention, the engaging portion has an engaging hole for engaging the bolt or the nut.
An engagement groove may be provided apart from the engagement hole to engage with another bolt or nut.

Further, as in the invention of claim 5, it is preferable that the ground portion is provided with a ground plate for enlarging the ground area.

[0015]

According to the structure of the first aspect of the present invention, when assembling the backstay, the two tubular members are abutted against each other in the axial direction, and when the tubular members are fastened with a plurality of bolts and nuts. The engaging portion of the jig is engaged with the bolt or nut (which is in a temporarily fixed state in advance) on which the tubular member is about to roll, and the grounding portion is grounded. If, for example, bolts and nuts are tightened with a tool such as a wrench in this state, the tightening torque at this time works to roll the tubular member, but the tubular member does not roll due to the ground portion of the jig. In-situ rotation is prevented by an engagement portion which is prevented and which engages the bolt or nut. The same applies when loosening the bolts and nuts.

Further, according to the structure of the second aspect of the present invention, the engagement distance becomes long even in the circumferential direction between the engagement portion and the tubular member.
The force (rotational torque) that the tubular member tries to rotate can be reliably received by the jig, and the rolling of the tubular member can be prevented.

Further, according to the third aspect of the invention, the bolt or the nut can be securely engaged in the engaging hole of the jig, and the jig can be easily formed from the tubular member (bolt or nut). It can be prevented from coming off.

According to the invention of claim 4, the bolt or nut can be engaged in the engagement hole, and another bolt or nut can be engaged in the engagement groove side. It can be more reliably prevented from coming off from the member (bolt or nut).

Further, according to the fifth aspect of the invention, even if the ground contacting the ground is soft, it is possible to prevent the ground from slipping into the ground, and to stabilize the jig even when the ground is uneven. Further, it is possible to prevent the jig from falling and prevent the jig from coming off the tubular member (bolt or nut).

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A backstay assembling / disassembling jig for a pile driver according to an embodiment of the present invention will be described below with reference to FIGS.

First, FIGS. 1 to 4 show a first embodiment of the present invention.

In the figure, reference numeral 1 denotes a main body of a working machine which is a base of a pile driving machine, and the working basic body 1 is a lower traveling body 1A and an upper turning body mounted on the lower traveling body 1A so as to be turnable. It is roughly composed of the body 1B.

Reference numeral 2 denotes a pile driver main body provided on the front side of the working machine main body 1. The pile driver main body 2 is the upper swing body 1B.
The earth auger device 5 is roughly composed of a long columnar reader 4 attached to the front part of the via a front bracket 3 and an earth auger device 5 attached to the front side of the reader 4 so as to be movable up and down. Is for excavating a vertical hole (neither is shown) for driving a foundation pile or the like into the ground G. Further, a hammer device (not shown) is attached to the reader 4 in place of the earth auger device 5, and the hammer device drives a foundation pile into a vertical hole excavated by the earth auger device 5.

Here, the earth auger device 5 includes an auger machine 6 having a built-in motor and the like, a long cylindrical casing pipe 7 extending downward from the auger machine 6 along the reader 4, and The casing pipe 7 is extended in the axial direction, one end side of which is connected to the auger machine 6 and the other end side of which is generally composed of an earth auger 8 protruding from the casing pipe 7. A slide bracket 9 which is located on the side and to which one end of a back stay 10 to be described later is attached is slidably attached.

Reference numeral 10 denotes two backstays (only one is shown), one end of which is attached to the upper side of the reader 4 via the slide bracket 9 and the other end of which is attached to the rear portion of the upper swing body 1B of the working machine body 1. The back stay 10 is connected to the five tubular members 11, 11, ... Connected in the axial direction and the tubular member 11 located on the other end side,
It is generally composed of a hydraulic cylinder 12 for adjusting the angle of the leader 4 by extending and contracting 0.

Further, as shown in FIGS. 2 and 3, the tubular member 11 has flange portions 11A (only one of which is shown) projecting outward in the radial direction at both ends thereof. Bolt insertion hole 11B penetrating in the direction,
A plurality of 11B, ... Are provided at regular intervals in the circumferential direction. Further, each of the tubular members 11 is 100 to 30
It has a weight of about 0 kg.

.. are a plurality of bolts mounted in the respective bolt insertion holes 11B of the respective flange portions 11A,
, 14 denote nuts screwed to the bolts 13, respectively, and the bolts 13 and 14 connect the tubular members 11 via the flange portions 11A.

On the other hand, as shown in FIG. 4, reference numeral 21 denotes a backstay assembling / disassembling jig according to this embodiment.
Is composed of a jig body 22, an engaging portion 23, and a grounding portion 25, which will be described later.

Reference numeral 22 denotes a jig main body which is the main body of the jig 21.
The jig body 22 is formed in an elongated flat plate shape, and is formed in a substantially triangular shape whose width dimension decreases from the base end side toward the tip end side. The length L of the jig main body 22 between the engaging portion 23 and the grounding portion 25 is, for example, the cylindrical member 11
Is formed to have a diameter of or more. Further, the thickness of the jig main body 22 is set to be approximately equal to the height of the head 13A of the bolt 13, so that the weight is easy to handle while ensuring rigidity.

Reference numeral 23 is an engaging portion integrally formed on the base end side of the jig main body 22. The engaging portion 23 is formed in each bolt insertion hole 11B.
The width dimension W is larger than the interval. In addition, the engaging portion 23 is formed with two engaging holes 24, 24 having a spacing dimension equivalent to the spacing between the bolt insertion holes 11B, and each engaging hole 24 has a diameter dimension of each bolt hole. Head of thirteen
It is set to be slightly larger than the outer diameter of A and nut 14,
As a result, the heads 13 of the bolts 13 are inserted into the engaging holes 24.
By inserting A, the head 13A of each bolt 13 can be easily engaged.

Reference numeral 25 is a grounding portion provided on the tip side of the jig body 22, and the grounding portion 25 engages the engaging holes 24 of the engaging portion 23 with the head 13A of the bolt 13. sometimes,
A grounding surface 25 is provided on the ground G radially separated from the tubular member 11.
It is grounded via A.

The jig 21 for assembling and disassembling the backstay according to the present embodiment has the above-mentioned structure. Next, the assembling work of the backstay 10 using the jig 21 will be described.

First, each tubular member 11 is attached to the flange portion 11A.
After arranging them in the axial direction so as to abut each other, each bolt 13
Is inserted into each bolt insertion hole 11B, and each nut 14 is screwed into each bolt 13 by hand or the like to be temporarily fixed.

Next, when the bolt 13 is tightened, the tubular member 1
The jig 21 is arranged on the side where the 1 is about to roll (FIG. 4 shows the case where the bolt 13 is a right-hand screw), and the two engaging holes 24, 24 are formed between the adjacent bolts 13, 13. Head 13A, 1
3A while engaging the side surface of the engaging portion 23 with the flange portion 11
Follow A. Then, after the engaging portions 23 are engaged with the respective bolts 13, the tubular member 11 is slightly rotated and the grounding portions 25
The ground contact surface 25A is pressed against the ground G.

When the preparatory work for fastening the bolt 13 is completed in this manner, the wrench 26 is engaged with the head 13A of the bolt 13 on the side opposite to the jig 21 (left side in the drawing), and the wrench 26 is removed. Rotate in the direction of arrow A to rotate the bolt 13
With a tightening torque of 50 to 150 Kgf · m.

At this time, although the rotating force in the direction of the arrow A acts on the tubular member 11, the ground contact portion 25 of the jig 21 does not contact the ground G.
Since the cylindrical member 11 is prevented from rolling and the bolts 13 and the engaging holes 24 are engaged with each other by being grounded on the ground, the jig 21 and the cylindrical member 11 are not connected to each other. It prevents slippage and does not rotate on the spot.

Therefore, since the tightening torque by the spanner 26 is surely transmitted to the bolt 13, it is possible to prevent the tightening loss which is caused by the rolling of the tubular member 11, and at the time of tightening each bolt 13 and the like. The workability in can be improved.

Then, each bolt 13 for mounting the jig 21
The back stay 10 can be assembled by repeating the above-described work while connecting the other cylindrical members 11 and the hydraulic cylinder 12 in the axial direction while sequentially replacing the positions.

Thus, according to this embodiment, the engaging portion 23 (each engaging hole 24) of the jig 21 for assembling and disassembling the back stay.
By engaging the grounding portion 25 with the ground G while engaging the bolts 13 with each other, it is possible to effectively prevent the tubular members 11 from rolling, and perform the fastening work of each bolt 13 efficiently. At the same time, even a small number of workers can connect and assemble each tubular member (it can be done by one person if only the bolts 13 and nuts 14 are tightened), and the assembly work of the back stay 10 can be performed. It can be made easy and work efficiency can be greatly improved.

Further, in this embodiment, the engaging portion 23 is provided with two engaging holes 24, 24, and the engaging holes 24 are formed in the head portions 13A, 13A of the two adjacent bolts 13, 13. Since they are engaged, the engaging portion 23 of the jig 21 can be easily attached to and detached from the tubular member 11 side, and workability can be greatly improved.

Furthermore, since the jig 21 is formed in a substantially triangular shape by increasing the width W of the engaging portion 23 and decreasing the width toward the tip side, the jig 21 can be reduced in weight. However, it can be formed with high strength.

Next, FIG. 5 shows a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 31 denotes a backstay assembling / disassembling jig according to this embodiment, and the jig 31 is composed of a jig body 32, an engaging portion 33, and a grounding portion 36, which will be described later.

Reference numeral 32 denotes a jig main body which is the main body of the jig 31.
The jig body 32 is the jig body 2 according to the first embodiment.
2 is formed in the shape of an elongated flat plate, and is formed in a substantially triangular shape in which the width dimension decreases from the base end side toward the tip end side, and the length dimension L1 between the engaging portion 33 and the ground contact portion 36 Is formed to have the diameter of the tubular member 11 or more.

Reference numeral 33 is an engaging portion integrally formed on the base end side of the jig main body 32 according to the present embodiment. The engaging portion 33 is substantially the same as the engaging portion 23 described in the first embodiment. In addition, the width dimension W1 is larger than the interval between the bolt insertion holes. However, the engaging portion 33 is located on the upper side of the engaging hole 34 that engages with the head portion 13A of the bolt 13 and is spaced apart from the engaging hole 34 on the upper side, and is located on the head portion 13A of another adjacent bolt 13. The first point in that the engaging groove 35 cut out so as to engage is provided.
Is different from the engaging portion 23 according to the embodiment.

36 is provided on the tip side of the jig body 32,
Similar to the grounding portion 25 according to the first embodiment, the grounding surface 36
The grounding part which has A is shown.

Thus, in this embodiment having the above-mentioned structure, substantially the same effects as those of the first embodiment can be obtained, but in particular, in this embodiment, the engaging portion 33 is engaged. Since the hole 34 and the engagement groove 35 are provided, the engagement groove 34 is engaged with the head portion 13A of the bolt 13 and the tip end side of the jig 31 is lifted up to make an engagement groove. 35 can be easily engaged with the head portion 13A of the other bolt 13, and the attachment work of the jig 31 can be further facilitated.

Next, FIG. 6 shows a third embodiment of the present invention. In this embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 41 denotes a backstay assembling / disassembling jig according to this embodiment, and the jig 41 comprises a jig body 42, an engaging portion 43, and a grounding portion 45 which will be described later.

Reference numeral 42 denotes a jig main body which constitutes the main body of the jig 41.
The jig body 32 is the jig body 2 according to the first embodiment.
2 is formed in the shape of an elongated flat plate, and is formed in a substantially triangular shape in which the width dimension decreases from the base end side toward the tip end side, and the length dimension L2 between the engaging portion 43 and the ground contact portion 45. Is formed to have the diameter of the tubular member 11 or more.

Reference numeral 43 denotes an engaging portion integrally formed on the base end side of the jig body 42 according to the present embodiment. The engaging portion 43 is substantially the same as the engaging portion 23 described in the first embodiment. In addition, the width dimension W2 is larger than the distance between the bolt insertion holes. However, the engaging portion 43 is provided with three engaging holes 44, 44, 44 which engage with the head portions 13A, 13A, 13A of the three bolts 13, 13, 13 which are continuous in the circumferential direction. It differs from the engaging portion 23 according to the first embodiment in that it is present.

45 is provided on the tip side of the jig body 42,
Similar to the grounding portion 25 according to the first embodiment, the grounding surface 45
The grounding part which has A is shown.

Thus, in this embodiment having the above-mentioned structure, the same effects as those of the above-described embodiments can be obtained. However, particularly in this embodiment, the engaging portion 43 is provided.
Since the three engaging holes 44, 44, 44 are provided in each of the three bolts 13, 13, 13, the engaging portions 43 of the jig 41 can be more reliably engaged with the tubular member 11. It is possible to engage with the side, prevent the jig 41 from falling off during assembly work, and improve safety and work efficiency.

Next, FIG. 7 shows a fourth embodiment of the present invention. In this embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 51 denotes a backstay assembling / disassembling jig according to the present embodiment, which comprises a jig body 52, an engaging portion 53, and a grounding portion 57, which will be described later.

Reference numeral 52 denotes a jig main body which is a main body of the jig 51.
The jig body 52 is the jig body 2 according to the first embodiment.
2, it is formed in an elongated flat plate shape, and is formed in a substantially triangular shape whose width dimension decreases from the base end side toward the tip end side, and the length dimension L3 between the engaging portion 53 and the ground contact portion 57. Is formed to have the diameter of the tubular member 11 or more.

Reference numeral 53 is an engaging portion according to the present embodiment, which is provided on the base end side of the jig main body 52. The engaging portion 53 is substantially the same as the engaging portion 23 described in the first embodiment. The width dimension W3 is larger than the interval between the bolt insertion holes. However, the engaging portion 53 is positioned above the engaging hole 54 that engages with the head portion 13A of the bolt 13 and is spaced apart from the engaging hole 54 to the upper side, and the head portion 13A of another adjacent bolt 13 is disposed. According to the first embodiment, a notch 55 formed so as to be avoided and an abutting part 56 located above the notch 55 and abutting the outer peripheral surface of the tubular member 11 are provided. It is different from the engaging portion 23.

57 is provided on the tip side of the jig body 52,
Similar to the grounding portion 25 according to the first embodiment, the grounding surface 57
The grounding part which has A is shown.

Thus, in this embodiment having the above-mentioned structure, it is possible to obtain substantially the same effects as those of the above-described embodiments, but in particular, in this embodiment, the bolt 13 is used.
Even if one is missing, the tubular member 11 can be prevented from rotating.

Next, FIGS. 8 and 9 show a fifth embodiment of the present invention. In this embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 61 denotes a backstay assembling / disassembling jig according to this embodiment, and the jig 61 comprises a jig body 62, an engaging portion 63, and a grounding portion 65, which will be described later.

Reference numeral 62 denotes a jig main body which is a main body of the jig 61.
The jig body 62 is the jig body 2 according to the first embodiment.
It is formed in an elongated flat plate shape having substantially the same length and width as 2, and is formed in a substantially triangular shape in which the width dimension decreases from the base end side to the tip end side.

Reference numeral 63 is an engaging portion provided on the base end side of the jig body 32. The engaging portion 63 is similar to the engaging portion 23 described in the first embodiment, and each bolt insertion hole is formed. Two engaging holes 64, 64 are formed with a width dimension larger than the space between the bolt insertion holes 11 </ b> B and a space size equal to the space between the bolt insertion holes 11 </ b> B.

Reference numeral 65 is a grounding portion according to the present embodiment provided on the tip side of the jig body 62. The grounding portion 65 has a rectangular shape so as to be orthogonal to the jig body 62 as shown in FIG. The ground plate 66 is fixed by welding means or the like.
Is grounded to the ground G via a large ground plane 66A.

Thus, even in the present embodiment having such a configuration, it is possible to obtain substantially the same operational effects as in the above-mentioned respective embodiments, but particularly in the present embodiment, the grounding portion 65 is used.
Since the ground contact area can be expanded by fixing the ground contact plate 66 to the ground contact part 66, the ground contact part 6 can be used when the ground G is soft.
5 can be prevented from slipping into the ground G.
It is possible to stabilize the grounding portion 65 even when there is unevenness on the ground. Moreover, since the jig 61 can be prevented from falling down, it is possible to prevent the jig 61 from falling off on the side of the engaging portion 63.

In each of the above embodiments, the case where the back stay assembling / disassembling jigs 21, 31, 41, 51, 61 are engaged with the heads 13A of the bolts 13 is illustrated. , 31, 41, 51, 61 may be engaged with each nut 14.

Further, in each of the above-mentioned embodiments, the back stay 1
Although the assembly work of No. 0 has been described, when disassembling the back stay 10, the jigs 21, 31, 41, 51, 61 are used.
Work may be performed with the positional relationship between the wrench and the spanner 26 reversed.

Further, in the third embodiment, the engaging portion 4
3 has three engaging holes 44, 44, 44, but as shown by the dotted line in FIG. 6, the notch 71 is used to avoid the central bolt 13 and engage with the two bolts 13. May be.

[0069]

As described in detail above, according to the invention of claim 1, when assembling a back stay, for example, the tubular members are abutted in the axial direction so that a plurality of bolts are attached to the tubular members. With the nut temporarily fixed, the bolt or nut on which the tubular member is about to roll is engaged with the engaging portion of the jig and the ground portion is grounded. This allows the bolt,
When tightening the nut with a tool such as a wrench, the tightening force at this time works to roll the tubular member,
It is possible to prevent the tubular member from rolling by the grounding portion of the jig, and also to prevent the tubular member from rotating in place by engaging the engaging portion with a bolt or a nut. Therefore, the tightening force of the spanner can be reliably transmitted to the bolt or nut to eliminate the tightening loss, and the workability at the time of tightening with the bolt and nut can be improved and the work efficiency can be improved. On the other hand, the same applies when loosening the bolts and nuts to disassemble the back stay. Further, the jig main body can be made lighter and formed with high strength.

According to the second aspect of the invention, by increasing the engagement distance (area) in the circumferential direction between the engaging portion and the tubular member, the force (rotation torque) that the tubular member attempts to rotate is increased. ) Can be reliably received by a jig, the rolling or rotation of the tubular member can be reliably prevented, and the workability can be improved.

Further, according to the third aspect of the present invention, by inserting the bolt or the nut into the engaging hole, the engaging portion of the jig can be reliably engaged with the tubular member. It is possible to prevent the jig from falling off from the tubular member side during the tightening work, and to simplify the work of attaching the jig to the tubular member side and improve workability. Further, the engaging hole can be formed in the jig by simple hole processing, and the productivity in manufacturing the jig can be improved.

According to the invention of claim 4, a bolt or a nut is inserted into the engagement hole, and in this state, the engagement groove is engaged with another bolt or nut, so that two engagement grooves are formed. It can be easily engaged with eye bolts or nuts, and the workability at the time of attaching and detaching the jig to and from the tubular member can be improved.

Further, according to the invention of claim 5, since the grounding area of the grounding portion can be expanded by the grounding plate, the grounding portion can be grounded even when the ground on which the grounding portion grounds is soft or on uneven ground. It can prevent you from getting into the ground and becoming unstable. Moreover, it is possible to prevent the jig from falling and the engaging portion from falling off the bolts and nuts, and it is possible to improve safety and reliability.

[Brief description of drawings]

FIG. 1 is a side view showing a pile driver according to a first embodiment.

FIG. 2 is an enlarged view of a back stay and the like shown in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is an operation explanatory view showing a state where bolts are tightened using the backstay assembling / disassembling jig according to the first embodiment.

FIG. 5 is an operation explanatory diagram similar to FIG. 4, showing a state in which bolts are tightened using the backstay assembly / disassembly jig according to the second embodiment.

FIG. 6 is a work explanatory view similar to FIG. 4, showing a state in which bolts are tightened using a backstay assembly / disassembly jig according to a third embodiment.

FIG. 7 is an operation explanatory view similar to FIG. 4, showing a state where bolts are tightened using a backstay assembly / disassembly jig according to a fourth embodiment.

FIG. 8 is an operation explanatory view similar to FIG. 4, showing a state in which bolts are tightened using a backstay assembly / disassembly jig according to a fifth embodiment.

9 is an external perspective view showing the back stay assembling / disassembling jig in FIG. 8 in an enlarged manner.

[Explanation of symbols]

1 Working machine main body (base) 2 Pile driver main body 10 Back stay 11 Cylindrical member 11A Flange portion 11B Bolt insertion hole 12 Hydraulic cylinder 13 Bolt 13A Head 14 Nut 21, 31, 41, 51, 61 Back stay assembly / Disassembly jig 22, 32, 42, 52, 62 Jig body 23, 33, 43, 53, 63 Engagement portion 24, 34, 44, 54, 64 Engagement hole 25, 36, 45, 57, 65 Ground Part 25A, 36A, 45A, 57A, 66A Ground plane 26 Spanner 35 Engaging groove 66 Ground plate G Ground

Claims (5)

[Claims] 1. A base, a pile driver main body attached to the base, and a plurality of tubular members are axially connected to each other to form a long length, and the pile driver main body is placed at a working position. A jig for backstay assembly and disassembly of a pile driver, which comprises a backstay provided between the pile driver main body and a base for holding, and a jig main body formed in an elongated flat plate shape. Of the bolts and nuts that are provided on the base end side of the jig body and are arranged on the outer peripheral side of the tubular member when connecting the tubular members with a plurality of bolts and nuts. A pile composed of an engaging portion that engages with at least one bolt or a nut, and a grounding portion that is provided on the tip side of the jig body and that grounds at a position radially separated from the tubular member. Tool for assembling and disassembling backstays for hammering machines. 2. A plurality of bolt insertion holes through which the bolts are inserted are formed in each of the tubular members, and the engagement portion has a width dimension larger than an interval between the bolt insertion holes. The backstay assembling / disassembling jig for a pile driver according to claim 1, wherein the jig is configured to extend in the circumferential direction of the member. 3. The backstay assembly / disassembly of a pile driver according to claim 1, wherein the engaging portion is formed with at least one engaging hole that engages with the bolt or the nut. Jig. 4. The engaging portion is provided with an engaging hole that engages with the bolt or nut and an engaging groove that is spaced from the engaging hole and engages with another bolt or nut. A backstay assembling / disassembling jig for a pile driver according to claim 1 or 2. 5. The backstay assembling / disassembling jig for a pile driver according to claim 1, 2, 3 or 4, wherein the grounding portion is provided with a grounding plate for enlarging a grounding area.