Bolt removal jig

Abstract

This invention provides a bolt removal tool that allows for easy removal of bolts connected to a bolt turning tool. [Solution] The bolt removal jig 1 is a jig for removing a bolt B3 connected to a bolt turning tool T from the bolt turning tool T. The bolt removal jig 1 comprises a bolt fastener 10 fastened to the right-hand thread B3c of the bolt B3, and a holder 20 that holds the bolt fastener and restricts the rotation of the bolt fastener around an axis along the central axis of the bolt fastener. The bolt fastener 1 is configured to switch between a normal state in which the bolt B3 can be fastened from a direction along the central axis of the bolt fastener T, and a removal state in which the fastened bolt can be removed. The holder 20 has a holding hole 21 that detachably holds the bolt fastener 10 in the normal state, and holds the bolt fastener through the holding hole and restricts the rotation of the bolt fastener.

Description

Technical Field

[0001] The present invention relates to a bolt removal jig, and more particularly to a bolt removal jig for removing a bolt connected to a bolt rotation tool from the bolt rotation tool.

Background Art

[0002] Conventionally, in building construction, in order to connect columns (first fastened members) and beams (second fastened members) that form the building structure, an operation is performed where the beam is abutted against the outer surface of the column and the column and beam are fastened with high-strength bolts (see, for example, Patent Document 1).

[0003] In the above operation, in order to improve the efficiency of the construction work, screw fastening of the column and beam is performed using double-thread bolts having both right and left threads. For example, it is as follows. First, with the state where the left-thread hole formed on the side surface of the column and the through hole formed on the beam are in communication, the double-thread bolts are rotated counterclockwise by a bolt rotation tool T to fasten the left threads of the double-thread bolts. At this time, by connecting the pin tails provided on the heads of the double-thread bolts and the nuts pre-fastened to the right threads of the double-thread bolts to the bolt rotation tool T, the double-thread bolts can be rotated by the bolt rotation tool T. Note that when a fastening torque above a predetermined value acts, the pin tail breaks. Then, the nuts pre-fastened to the right threads of the double-thread bolts are rotated clockwise by the bolt rotation tool T to tighten the nuts. At this time, the nuts are tightened until they abut against the beam (the end plate of the beam).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

[0005] Incidentally, if a bolt (double-ended bolt) is not tightened properly during the fastening process, it is necessary to remove the bolt in order to replace it. Alternatively, it may be necessary to remove an old bolt in order to replace it. In such cases, a jig has been proposed for removing bolts fastened to the building's structure (see, for example, Patent Document 2). While the above-described jigs allow bolts fastened to a building's structure to be removed using tools, there were instances where a bolt would become jammed in the tool, making it impossible to remove. Therefore, there was a need for a bolt removal jig that could easily remove bolts connected to a bolt turning tool. Furthermore, there was a need for a bolt removal tool that could be used not only for double-threaded bolts, but also when a regular bolt became jammed in a bolt removal tool.

[0006] The object of the present invention is to provide a bolt removal jig that can easily remove a bolt connected to a bolt turning tool from the bolt turning tool. Another object of the present invention is to provide a bolt removal jig that can be used after a bolt (double-threaded bolt) has been removed from the building frame using a bolt turning tool, and that can easily remove the bolt from the bolt turning tool. [Means for solving the problem]

[0007] The aforementioned problem is solved by the bolt removal jig of the present invention, which is a bolt removal jig for removing a bolt connected to a bolt turning tool from the bolt turning tool, comprising: a bolt fastener fastened to a fastening portion provided on the tip of the bolt; and a holder that holds the bolt fastener and restricts the rotation of the bolt fastener around an axis along the central axis of the bolt fastener, wherein the bolt fastener is configured to switch between a normal state in which the bolt can be fastened from a direction along the central axis of the bolt fastener and a removal state in which the fastened bolt can be removed, and the holder has a holding portion that detachably holds the bolt fastener in the normal state, and the holding portion holds the bolt fastener and restricts the rotation of the bolt fastener. With the above configuration, a bolt removal jig can be realized that allows bolts connected to a bolt turning tool to be easily removed from the bolt turning tool. Specifically, the bolt removal jig described above comprises a bolt fastener and a holder. The bolt fastener is configured to switch between a "normal state" that allows bolts to be fastened and a "removed state" that allows bolts to be removed. The holder removably holds the bolt fastener and restricts its rotation. This allows the bolt fastener and holder to be used to temporarily fasten a bolt that has become stuck in a bolt turning tool to the bolt fastener, and then remove the bolt from the bolt turning tool. By switching the bolt fastener from the "normal state" to the "removed state," the bolt stuck in the bolt fastener can be easily removed.

[0008] In this case, the bolt fastener has a fastened portion that is fastened to the fastening portion provided at the tip of the bolt, and is preferably configured to switch between a normal state in which the fastener surrounds the bolt from the side when the bolt is fastened to the bolt fastener, and a removable state in which it unfolds from the normal state and the fastened bolt can be removed from the side. With the above configuration, by switching the bolt fastener from the "normal state" to the "removed state," bolts that have become stuck in the bolt fastener can be easily removed from the side.

[0009] In this case, the bolt fastener is preferably separable horizontally, and switching from the normal state to the detached state is desirable. With the above configuration, by dividing the bolt fastener, the bolt fastened to the bolt fastener can be easily removed from the side.

[0010] In this case, the bolt fastener preferably includes a first divided body and a second divided body that can be divided horizontally and, when combined, can fasten the fastening portion at the tip of the bolt, and a biasing spring that connects the first divided body and the second divided body and biases the first divided body and the second divided body from a divided state to a combined state. Furthermore, the fastened portion is a fastening screw hole formed in the region surrounded by the first and second divided parts when the first and second divided parts are combined, and when the first and second divided parts are combined, a first boundary portion and a second boundary portion are formed, and the biasing spring is provided so as to straddle the first boundary portion and is attached to the outer surface of the first divided part and the outer surface of the second divided part, and is provided so as to straddle the first boundary portion, and biases the first and second divided parts from a state in which they are divided starting from the second boundary portion to a state in which they are combined. As described above, the presence of a biasing spring allows the bolt fastener to be biased to its "normal state," making it easier for the worker to handle the bolt fastener.

[0011] In this case, the retaining portion is a retaining hole formed on the surface of the retainer, which allows the bolt fastener to be accommodated from a direction along the central axis of the bolt fastener, and the retaining hole preferably has a first hole for accommodating the first divided body and the second divided body in their normal state, and a second hole formed continuously with the first hole for accommodating the biasing spring. With the above configuration, the retaining part can accommodate a bolt fastener composed of a first divided body, a second divided body, and a biasing spring, and the rotation of the bolt fastener can be restricted.

[0012] In this case, it is preferable that the bolt fastener has a first divided body and a second divided body that can be divided horizontally and, when combined, can fasten the fastening portion at the tip of the bolt, and a permanent magnet that holds the first divided body and the second divided body in the combined state. As described above, the presence of a permanent magnet allows the bolt fastener to be maintained in its "normal state," making it easier for workers to handle the bolt fastener.

[0013] In this case, the bolt removal jig is used after the bolts having standard and reverse threads, which are screw-fastened to the building structure, have been removed from the building structure by the bolt turning tool, and is a jig for removing the bolts that are screw-fastened to the bolt turning tool from the bolt turning tool. With the above configuration, a bolt removal jig can be realized that is used after bolts (double-threaded bolts) have been removed from the building frame using a bolt turning tool, and that allows the bolts to be easily removed from the bolt turning tool. [Effects of the Invention]

[0014] According to the bolt removal jig of the present invention, it is possible to easily remove a bolt connected to a bolt turning tool from the bolt turning tool. Another object of the present invention is that it can be used after a bolt (double-threaded bolt) has been removed from the building frame using a bolt turning tool, making it possible to easily remove the bolt from the bolt turning tool. [Brief explanation of the drawing]

[0015] [Figure 1] Perspective view of the building structure, bolt rotation tool, and bolt removal jig, showing the state where the bolt has been removed from the structure by the bolt rotation tool. [Figure 2] Perspective view of the building structure, which is an exploded perspective view of the structure, bolt, and nut. [Figure 3] Cross-sectional view of the building structure, showing the state where the bolt is fastened to the structure. [Figure 4] Cross-sectional view of the building structure, showing the state where the bolt has been removed from the structure. [Figure 5] Perspective view of the building structure, showing the state where the bolt has been removed from the structure by the bolt rotation tool. [Figure 6] Exploded perspective view of the bolt rotation tool with the bolt engaged, bolt fastener, and retainer. [Figure 7] Assembly drawing of FIG. 6. [Figure 8] Assembly drawing of the bolt fastener with the bolt engaged and retainer. [Figure 9] Diagram showing that the bolt fastener has switched from the "normal state" to the "removed state".

Mode for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 9. This embodiment relates to a "bolt removal jig" that enables the easy removal of a bolt connected to a bolt rotation tool from the bolt rotation tool.

[0017] <Overall Configuration> As shown in FIGS. 1, 6 to 9, the bolt removal jig 1 is used when removing a bolt connected to the bolt rotation tool T from the bolt rotation tool T. More specifically, the bolt removal jig 1 is used after the double-threaded bolt B3, which is screw-fastened to the building frame B, has been removed from the frame B using the bolt turning tool T, and is used when removing the double-threaded bolt B3, which is screw-fastened to the bolt turning tool T, from the bolt turning tool T. For example, by using the bolt removal jig 1, a bolt (double-threaded bolt B3) that has become stuck in the bolt rotating tool T can be easily removed, as shown in Figures 6 to 9. The following will describe "Structure B" and "Bolt Rotating Tool T," followed by a detailed explanation of the bolt removal jig 1.

[0018] <<Main body>> As shown in Figures 1 to 4, the building's structural frame B comprises columns B1 that are long in the vertical direction and beams B2 that are connected to the outer surface of columns B1 and extend in the width direction. Column B1 and beam B2 are connected by double-threaded bolts B3, washers B4 and nuts B5. More specifically, the column B1 and beam B2 are connected by bringing the column plate B1a (screw hole B1b) fixed to the outer surface of the column B1 into contact with the beam end plate B2a (through hole B2b) fixed to one end of the beam B2 in the extending direction, fastening the double-ended screw bolt B3, and tightening the washer B4 and nut B5.

[0019] More specifically, in order to streamline construction work, the columns B1 and beams B2 are fastened together using double-threaded bolts B3, which have both right-hand threads B3b and left-hand threads B3c. Specifically, this is as follows (see Figures 2 and 3). First, with the reverse threaded hole B1b formed on the outer surface of column B1 and the through hole B2b formed in beam B2 connected, the double-threaded bolt B3 is rotated in the reverse direction using the bolt turning tool T to fasten the reverse thread B3c of the double-threaded bolt B3. At this time, the double-threaded bolt B3 can be rotated by connecting the pin tail B3d provided on the head of the double-threaded bolt B3 and the nut B5 that is fastened to the standard thread B3b of the double-threaded bolt B3 to the bolt turning tool T. Note that if a tightening torque exceeding a predetermined level is applied, the pin tail B3d will break. Next, the nut B5, which has been pre-fastened to the right-hand thread B3b of the double-threaded bolt B3, is tightened by rotating it in the forward direction using the bolt turning tool T. At this time, the nut B5 is tightened until it is in contact with the beam B2 (beam end plate B2a). After the double-threaded bolt B3 is fastened, as shown in Figures 2 and 3, the reverse-threaded B3c of the double-threaded bolt B3 is fastened to the column plate B1a, the central part B3a (cylindrical part) penetrates the beam end plate B2a, and the standard-threaded B3b is fastened to the washer B4 and nut B5.

[0020] If improper tightening of a bolt occurs during the bolt fastening process described above, it may be necessary to remove the bolt in order to replace it. Alternatively, it may be necessary to remove the bolt in order to replace an old bolt. In such cases, it is best to connect the "bolt connection jig T1" to the tip of the "bolt turning tool T" and use the "bolt connection jig T1" to remove the bolt.

[0021] <<Bolt turning tools, bolt connection jigs>> The bolt turning tool T is, for example, a power tool such as an impact wrench. As shown in Figures 1 to 5, the bolt connection jig T1 comprises a main body T10, a nut portion T20 provided at one end of the main body T10 in the extending direction for connecting to a double-threaded bolt B3, and a socket portion T30 provided at the other end of the main body T10 in the extending direction for connecting to a bolt turning tool T.

[0022] The nut portion T20 has an internal threaded portion T21 that connects to the double-threaded bolt B3 (right-hand thread B3b), and a hexagonal portion T22 that connects to a hand tool such as a wrench or spanner. The socket portion T30 has a connecting hole portion T31 formed at the center of the socket portion T30, which is connected to the bolt turning tool T. In other words, the bolt connection jig T1 has the function of connecting to a double-threaded bolt B3, the function of connecting to a bolt turning tool T, and the function of connecting to a hand tool such as a wrench.

[0023] A method for removing bolts using a bolt rotation tool T (bolt connection jig T1) will be explained based on Figures 3 to 5. First, as shown in Figure 3, the worker connects the connection hole T31 (square hole) of the bolt connection jig T1 to the connection part Ta (square protrusion) of the bolt turning tool T.

[0024] Then, as shown in Figure 3, the worker connects the internal thread portion T21 of the bolt connection jig T1 to the right-hand thread B3b of the double-threaded bolt B3 that is screwed to the structure B. Specifically, with the bolt connection jig T1 pressed against the double-threaded bolt B3, the bolt connection jig T1 is rotated forward by the rotational movement of the bolt rotation tool T, thereby screwing the internal thread portion T21 into the right-hand thread B3b.

[0025] Then, as shown in Figures 4 and 5, the worker removes the double-threaded bolt B3 from the structure B by rotating the bolt turning tool T while the bolt connecting jig T1 is connected to the double-threaded bolt B3. Specifically, the bolt connection jig T1 and the double-threaded bolt B3 are rotated in the forward direction by the rotational movement of the bolt turning tool T, thereby removing the double-threaded bolt B3 (reverse thread B3c), which is screwed to the frame B (reverse thread hole B1b), from the frame B. Using the method described above, the double-threaded bolts B3 fastened to the building's frame B can be efficiently removed using a bolt rotation tool T (bolt connection jig T1).

[0026] By the method described above, the double-threaded bolt B3 fastened to the frame B can be easily removed using the bolt rotation tool T (bolt connection jig T1). On the other hand, a double-threaded bolt B3 can sometimes get jammed in the bolt turning tool T. In such cases, it is advisable to use the "bolt removal jig 1" to remove the double-threaded bolt B3 that has become stuck in the bolt rotating tool T (bolt connecting jig T1).

[0027] <<Bolt Removal Tool>> The bolt removal jig 1, as shown in Figures 1, 6 to 9, is a jig for removing a double-threaded bolt B3 that has become stuck in the bolt rotating tool T. The bolt removal jig 1 comprises a bolt fastener 10 that is fastened to the tip (reverse thread B3c) of the double-threaded bolt B3, and a holder 20 that holds the bolt fastener 10 and restricts the rotation of the bolt fastener 10 around an axis along the central axis of the bolt fastener 10.

[0028] As shown in Figures 6 and 9, the bolt fastener 10 is configured to switch between a "normal state" in which the double-threaded bolt B3 can be fastened from a direction along the central axis of the bolt fastener 10, and a "removed state" in which the fastened double-threaded bolt B3 can be removed. Specifically, the bolt fastener 10 is divisible horizontally, and by divisifying it from the "normal state," it switches to the "removable state."

[0029] The bolt fastener 10 includes a first divided body 11 and a second divided body 12 that can be divided horizontally and, when combined, can fasten the tip of a double-threaded bolt B3 (reverse thread B3c), a biasing spring 16 that connects the first divided body 11 and the second divided body 12, and permanent magnets 17 and 18 that hold the first divided body 11 and the second divided body 12 in the combined state.

[0030] As shown in Figures 6 and 7, the state in which the first divided body 11 and the second divided body 12 are combined is the "normal state". On the other hand, as shown in Figure 9, the state in which the first divided body 11 and the second divided body 12 are separated is the "detached state". In the "normal state," a fastening screw hole 13 (fastened portion) is formed in the area surrounded by the first divided body 11 and the second divided body 12. The fastening screw hole 13 is a reverse threaded hole and is capable of fastening with the tip portion (reverse thread B3c) of a double-threaded bolt B3. When in the "detached state," the double-threaded bolts B3 fastened to the first divided body 11 and the second divided body 12 (fastening screw holes 13) can be removed from the side.

[0031] The first divided body 11 and the second divided body 12 are, for example, divided nuts formed by equally dividing a hexagonal nut into two. When the first divided body 11 and the second divided body 12 are combined, a hexagonal nut is formed, and the first boundary portion 14 and the second boundary portion 15 are also formed. Furthermore, the first partition 11 and the second partition 12 do not necessarily have to be divided equally; they may be divided such that the first partition 11 is larger (or smaller) than the second partition 12. Furthermore, the combination of the first divided body 11 and the second divided body 12 may result in a nut with a polygonal shape other than a hexagonal nut. For example, it may be a bolt fastener having a fastening screw hole 13 and having a substantially elliptical or substantially polygonal shape.

[0032] The biasing spring 16 is, for example, a coil spring (torsion coil spring), and is provided so as to straddle the first boundary portion 14, and is attached to the outer surface of the first divided body 11 and the outer surface of the second divided body 12. The biasing spring 16 biases the first divided body 11 and the second divided body 12 from a state in which they are separated starting from the second boundary portion 15 to a state in which the first divided body 11 and the second divided body 12 are combined. By using the biasing spring 16, the bolt fastener 10 can be biased to its "normal state," making it easier for the worker to handle the bolt fastener 10. Note that the biasing spring 16 may be a biasing member other than a spring.

[0033] As shown in Figures 6 and 9, the permanent magnets 17 and 18 are components that hold the first divided body 11 and the second divided body 12 together by magnetic force. The first permanent magnet 17 is fixed to the outer surface of the first divided body 11, either to the second boundary portion 15 or to a portion adjacent to the second boundary portion 15. The second permanent magnet 18 is fixed to the outer surface of the second divided body 12, either to the second boundary portion 15 or to a portion adjacent to the second boundary portion 15. The permanent magnets 17 and 18 are joined to each other, which allows the bolt fastener 10 to be maintained in a "normal state" and makes it easier for workers to handle the bolt fastener 10.

[0034] The permanent magnets 17 and 18 may be fixed to the upper surfaces of the first and second divisions 11 and 12, respectively, or to the lower surfaces of the first and second divisions 11 and 12, or they may be embedded inside the first and second divisions 11 and 12. Alternatively, if at least one of the first segment 11 and the second segment can be joined to a permanent magnet by magnetic force, then only one permanent magnet may be used.

[0035] As shown in Figures 6 and 9, the retainer 20 is a member that detachably holds the bolt fastener 10 in its "normal state" and restricts the rotation of the bolt fastener 10. The holder 20 is, for example, a plate-shaped member and has a holding hole 21 for detachably holding the bolt fastener 10. The retaining hole 21 is formed on the surface of the retainer 20 and is a retaining portion that allows the bolt fastener 10 to be accommodated from a direction along the central axis of the bolt fastener 10.

[0036] The holding hole 21 has a first hole 21a for accommodating the first divided body 11 and the second divided body 12 in the "normal state", a second hole 21b formed continuously with the first hole 21a for accommodating the biasing spring 16, and a third hole 21c formed continuously with the first hole 21a for accommodating the permanent magnets 17 and 18. The retaining hole 21 in this embodiment has a hexagonal first hole 21a, a second hole 21b corresponding to the biasing spring 16, and a third hole 21c formed on the opposite side of the first hole 21a from the second hole 21b, and corresponding to the permanent magnets 17 and 18.

[0037] With the above configuration, when the bolt fastener 10 is placed in the holding hole 21, the bolt fastener 10 is held in place without rotating freely. Furthermore, when the double-threaded bolt B3 is fastened to the bolt fastener 10, deformation of the biasing spring 16 and permanent magnets 17 and 18 inside the holding hole 21 can be suppressed.

[0038] <How to remove bolts> Next, the bolt removal method using the bolt removal jig 1 will be explained based on Figures 6 to 9. As shown in Figures 6 and 7, when a double-threaded bolt B3 becomes jammed in the bolt turning tool T (bolt connecting jig T1), the worker attaches the jammed double-threaded bolt B3 to the bolt removal jig 1. More specifically, the worker places the bolt fastener 10 in its "normal state" into the holder 20 (holding hole 21) and sets it so that the bolt fastener 10 does not rotate. Then, the worker fastens the reverse thread B3c at the tip of the double-threaded bolt B3 into the fastening screw hole 13 of the bolt fastener 10. The worker fastens the double-threaded bolt B3 using the bolt turning tool T.

[0039] Then, as shown in Figure 8, the worker fastens the double-threaded bolt B3 to the bolt fastener 10 using the bolt turning tool T, and then pulls the bolt turning tool T upward. At this time, the bolt turning tool T can be moved from side to side as needed to separate it from the double-threaded bolt B3. As a result, the double-threaded bolt B3 is fastened to the bolt fastener 10. Specifically, it becomes engaged with the bolt fastener 10.

[0040] Then, as shown in Figure 9, the worker takes the double-threaded bolt B3 in their hand and pulls the double-threaded bolt B3 and the bolt fastener 10 out of the holder 20. The worker can then easily remove the double-threaded bolt B3 from the bolt fastener 10 by switching the bolt fastener 10 from the "normal state" to the "removed state".

[0041] With the above bolt removal method, the bolt connected to the bolt turning tool can be easily removed from the bolt turning tool. In particular, it makes it easy to remove double-threaded bolts that have become stuck in a bolt turning tool after being removed from the building's structure using the tool.

[0042] <Other> In the above embodiment, as shown in Figures 1 to 5, the bolt removal jig 1 is used to remove the double-threaded bolt B3 that has become stuck in the bolt rotating tool T after the double-threaded bolt B3 has been removed from the building frame B by the bolt rotating tool T, but it is not particularly limited. Simply put, it can be widely used to remove a bolt from a bolt turning tool T when the bolt has become jammed in the tip of the tool. Naturally, it is not limited to double-ended bolts, but can also be used to remove common bolts such as hex bolts. Preferably, this tool is used when removing double-threaded bolts, which allows for more efficient construction work (bolt fastening work) on buildings.

[0043] In the above embodiment, as shown in Figures 6 to 9, the bolt fastener 10 is equipped with a biasing spring 16 and permanent magnets 17 and 18, but it is not necessary to have either the biasing spring 16 or the permanent magnets 17 and 18, or neither of them.

[0044] In the above embodiment, as shown in Figures 6 to 9, the bolt fastener 10 is configured to switch between a "normal state" and a "removed state" by being divided into a first divided body 11 and a second divided body 12, but it may also be switched by other means. For example, the bolt fastener 10 may be configured so that part or all of it can be switched between a "normal state" and a "removed state" by a sliding structure, an extrusion structure, or other unfolding structure.

[0045] In the above embodiment, as shown in Figures 6 to 9, the holder 20 has a recessed-shaped holding hole 21, but it is not particularly limited. The holder 20 should be able to hold the bolt fastener 10 and restrict the rotation of the bolt fastener 10 around an axis along the central axis of the bolt fastener 10.

[0046] The above embodiment mainly described a bolt removal jig according to the present invention. However, the embodiments described above are merely examples to facilitate understanding of the present invention and do not limit it. The present invention can be modified and improved without departing from its spirit, and of course, equivalents thereof are included. [Explanation of Symbols]

[0047] B. Structural frame (building structure) B1 pillar B1a Column Plate B1b Screw hole (reverse thread hole) B2 Beam B2a Beam End Plate B2b Through hole B3 Double-ended threaded bolt (bolt) B3a Central Area B3b Right-hand thread B3c Reverse thread (fastening part) B3d Pintail B4 Washer B5 Nut T-bolt turning tool (impact wrench, bolt turning tool T) Ta connection part T1 Bolt Connection Jig T10 Main Unit T20 nut section T21 Internal thread section (bolt connection section) T22 hexagonal part T30 Socket T31 Connection hole 1. Bolt removal tool 10 Bolt fasteners 11 1st division body 12 Second division body 13 Fastening screw hole (fastened part) 14 First boundary part 15 Second boundary part 16 Biasing spring 17 First permanent magnet 18 Second permanent magnet 20 Holder 21 Holding hole (holding part) 21a First hole 21b Second hole 21c Third hole

Claims

1. A bolt removal jig for removing a bolt connected to a bolt turning tool from the bolt turning tool, A bolt fastener fastened to a fastening portion provided at the tip of the bolt, The system includes a holder that holds the bolt fastener and restricts the bolt fastener from rotating around an axis along the central axis of the bolt fastener, The bolt fastener is configured to switch between a normal state in which the bolt can be fastened from a direction along the central axis of the bolt fastener, and a detached state in which the fastened bolt can be removed. The aforementioned holder is It has a holding part that detachably holds the bolt fastener in the normal state, A bolt removal jig characterized by holding the bolt fastener with the holding portion and restricting the rotation of the bolt fastener.

2. The aforementioned bolt fastener is The bolt has a fastened portion which is fastened to the fastening portion provided at the tip of the bolt, The normal state is one in which the bolt is surrounded from the side when the bolt is fastened to the bolt fastener, The bolt removal jig according to claim 1, characterized in that it is configured to switch between the normal state and the removed state, in which the fastened bolt can be removed from the side.

3. The aforementioned bolt fastener is It is divisible horizontally, The bolt removal jig according to claim 2, characterized in that it switches to the removal state by separating from the normal state.

4. The aforementioned bolt fastener is A first divided body and a second divided body that are divisible horizontally and, when combined, allow the fastening portion at the tip of the bolt to be fastened, The bolt removal jig according to claim 3, further comprising a biasing spring that connects the first divided body and the second divided body and biases the first divided body and the second divided body from a separated state to a combined state.

5. The fastened portion is a fastening screw hole formed in the region surrounded by the first and second parts when the first and second parts are combined, When the first divided body and the second divided body are combined, a first boundary portion and a second boundary portion are formed. The biasing spring is, It is provided so as to straddle the first boundary portion and is attached to the outer surface of the first divided body and the outer surface of the second divided body, The bolt removal jig according to claim 4, characterized in that it biases the first divided body and the second divided body from a state in which they are divided starting from the second boundary portion to a state in which the first divided body and the second divided body are combined.

6. The retaining portion is a retaining hole formed on the surface of the retainer, which allows the bolt fastener to be accommodated from a direction along the central axis of the bolt fastener, The aforementioned retaining hole is A first hole for accommodating the first and second divided bodies in their normal state, The bolt removal jig according to claim 5, characterized in that it has a second hole formed continuously with the first hole and housing the biasing spring.

7. The aforementioned bolt fastener is A first divided body and a second divided body that are divisible horizontally and, when combined, allow the fastening portion at the tip of the bolt to be fastened, The bolt removal jig according to claim 3, further comprising a permanent magnet for holding the first divided body and the second divided body in a combined state.

8. The aforementioned bolt removal jig is After removing the bolts, which have both standard and reverse threads and are screw-fastened to the building structure, from the building structure using the bolt turning tool, The bolt removal jig according to any one of claims 1 to 7, characterized in that it is a jig for removing a bolt that has been screw-fastened to the bolt turning tool from the bolt turning tool.

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