Bolt removal jig and bolt removal method

Abstract

To provide a bolt removal jig which enables efficient removal of a bolt fastened to a building frame of a building.SOLUTION: A bolt removal jig 1 is used when a bolt B3 fastened to a building frame B of a building is removed from the building frame B by rotation operation of a tool. The bolt removal jig 1 includes: a bolt connection part 21 which is connected to a connected part provided at a head of the bolt B3 and may rotate with the bolt B3; a tool connection part 31 which is provided at an opposite side of the bolt connection part 21 in the bolt removal jig 1 and connected to a first tool T1 and may rotate in conjunction with rotation operation of the first tool T1; and a second tool connection part 22 which is provided on an outer peripheral surface of the bolt removal jig 1 and connected to a second tool T2 and may rotate in conjunction with rotation operation of the second tool T2.SELECTED DRAWING: Figure 8A

Description

Technical Field

[0001] The present invention relates to a bolt removal jig and a bolt removal method, and more particularly to a bolt removal jig and a bolt removal method used for removing bolts fastened to a building frame from the frame by a rotational operation of a 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 frame, an operation is performed in which the beam is abutted against the outer surface of the column and the column and the beam are fastened with high-strength bolts (see, for example, Patent Documents 1 and 2).

[0003] In the above operation, in order to improve the efficiency of the construction work, screw fastening of the column and the beam is performed using double-thread bolts having both right-hand threads and left-hand threads. For example, it is as follows. First, with the reverse thread holes formed on the side surface of the column and the through holes formed in the beam being in communication, the double-thread bolts are reversely rotated by a power tool to fasten the reverse 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-hand threads of the double-thread bolts to the power tool, the double-thread bolts can be rotated by the power tool. Note that when a fastening torque of a predetermined value or more acts, the pin tail breaks. Then, the nuts pre-fastened to the right-hand threads of the double-thread bolts are rotated forward by a power tool 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] By the way, when fastening bolts (double-threaded bolts), if improper tightening or other issues occur, it is necessary to remove the bolt in order to replace it. During the bolt removal process, there was no way to grip the bolt shaft, so for example, a double nut (two nuts) was tightened onto the bolt shaft, and then the bolt was removed from the building's structure by rotating the double nut. This meant that a separate double nut had to be prepared, and when replacing multiple bolts, the double nut used each time had to be removed and reused. Furthermore, power tools could not be used when tightening the double nut and rotating it to remove the bolt. In other words, it was necessary to prepare two wrenches or spanners and manually grip one nut while rotating the other.

[0006] This invention has been made in view of the above-mentioned problems, and the object of this invention is to provide a bolt removal jig and a bolt removal method that can remove bolts fastened to the structure of a building more efficiently than conventional methods. Another object of the present invention is to provide a bolt removal jig and a bolt removal method that can efficiently remove double-threaded bolts having both right-hand and left-hand threads, which are screwed to the frame of a building. [Means for solving the problem]

[0007] The aforementioned problem is addressed by the bolt removal jig of the present invention, which is used when removing a bolt fastened to the frame of a building by the rotational movement of a tool, comprising: a bolt connection part connected to a connected part provided on the head of the bolt, which is rotatable together with the bolt when connected to the bolt; and a part provided on the opposite side of the bolt connection part in the bolt removal jig, which is connected to a first tool, which rotates together with the rotational movement of the first tool when connected to the first tool. Integrated with the bolt connection portion A rotatable tool connection part, provided on the outer circumferential surface of the bolt removal jig, connected to a second tool, and when connected to the second tool, in conjunction with the rotational movement of the second tool Integrated with the bolt connection portion This problem is solved by providing a second tool connection part that allows rotation. With the above configuration, it is possible to realize a bolt removal jig that can remove bolts fastened to the building's structure more efficiently than conventional methods. Specifically, by using a dedicated jig that combines a bolt connection part, a tool connection part, and a second tool connection part, it becomes possible to remove bolts fastened to the structure from the structure by the rotational motion of a first tool (e.g., a power tool) and / or a second tool (e.g., a wrench).

[0008] In this case, the bolt removal jig is preferably used when removing double-threaded bolts, which have both standard and reverse threads and are screw-fastened to the building structure, from the building structure by the rotational movement of the first tool and / or the second tool. The above configuration makes it possible to efficiently remove double-threaded bolts, which have both standard and reverse threads, particularly those fastened to the building's structure.

[0009] In this case, the bolt removal jig has a nut portion, the bolt connection portion is an internal threaded portion provided at the center of the nut portion and connected to one of the threads of the double-threaded bolt, and the second tool connection portion is a polygonal polygonal portion provided on the outer circumferential surface of the nut portion and connected to a wrench or spanner as the second tool. With the above configuration, a bolt removal jig can be realized using a simple structure that utilizes nuts.

[0010] In this case, it is preferable that the internal thread portion is provided with a projection that is located inside the internal thread portion, protrudes from the bottom surface of the internal thread portion toward the opening, and contacts the head surface of the bolt when the internal thread portion is connected to the bolt. As described above, the presence of a projection on the bottom surface of the internal thread portion allows the projection to contact the head of the threads of the double-threaded bolt when the bolt removal tool is connected to the double-threaded bolt. This reduces the contact area between the threaded portion of the double-threaded bolt and the internal thread portion of the bolt removal tool. In other words, it prevents the two from being tightened more than necessary. This allows the bolt removal tool to be easily removed from the double-threaded bolt after it has been removed from the structure.

[0011] In this case, the bolt removal jig is connected to the bolt along the axial direction of the bolt, provided on the outer circumferential surface of the bolt removal jig, positioned in the axial direction different from the second tool connection portion, connected to the second tool, and further comprises a third tool connection portion which, when connected to the second tool, is rotatable in conjunction with the rotational movement of the second tool, and the second tool connection portion is the second of The connection position to the tool and the second of the third tool connection portion. of It is preferable that the connection position to the tool differs in the direction of rotation of the bolt. Furthermore, the bolt removal jig has a first nut portion and a second nut portion provided adjacent to the first nut portion and arranged in communication with the first nut portion, the bolt connection portion is an internal thread portion provided at the center position of the first nut portion and the second nut portion respectively and is connected to one thread of a double-threaded bolt having a right-hand thread and a left-hand thread, the second tool connection portion is a polygonal polygon provided on the outer circumferential surface of the first nut portion and is connected to a wrench or spanner as the second tool, the third tool connection portion is a polygonal polygon provided on the outer circumferential surface of the second nut portion and is connected to a wrench or spanner as the second tool, and it is preferable that the angular positions of the polygon of the second tool connection portion and the angular positions of the polygon of the third tool connection portion are different in the direction of rotation of the bolt. With the above configuration, the second tool connection part or the third tool connection part can be appropriately selected to connect the second tool. of A tool (e.g., a wrench) can be attached to it. This allows for the avoidance of interference with the building's structure (e.g., the flange of a beam), and the second of The tool can be rotated appropriately. In other words, the tool can be connected to the second or third tool connection part as appropriate so as not to interfere with the building structure, of The tool can be rotated.

[0012] The above problem is also solved by a bolt removal method using the above bolt removal jig, including a jig connection step of connecting the bolt removal jig to both screw bolts having right-handed and left-handed threads screwed to the building frame, a tool connection step of connecting the first tool and / or the second tool to the bolt removal jig, and a bolt removal step of removing both screw bolts from the frame by the rotational operation of the first tool and / or the second tool. In the jig connection step, the bolt removal jig is connected to one of the screws of both screw bolts to integrate both screw bolts and the bolt removal jig. In the bolt removal step, by rotating the one screw of both screw bolts forward by the rotational operation of the tool, the other screw of both screw bolts fastened to the frame is rotated backward to remove both screw bolts. With the above configuration, it is possible to realize a bolt removal method capable of efficiently removing both screw bolts having right-handed and left-handed threads screwed to the building frame.

Effects of the Invention

[0013] According to the bolt removal jig and the bolt removal method of the present invention, it is possible to remove bolts fastened to the building frame more efficiently than before. In particular, it is possible to efficiently remove both screw bolts having right-handed and left-handed threads screwed to the building frame.

Brief Description of the Drawings

[0014] [Figure 1] It is a perspective view of a building frame, showing the state before bolts are fastened to the frame (columns, beams). [Figure 2] It is a perspective view of a building frame, showing the state where bolts are fastened to the frame. [Figure 3] It is a perspective view of the bolt removal jig. [Figure 4] It is a perspective view of the bolt removal jig when viewed from another angle. [Figure 5]A cross-sectional view of a building's framework, showing a state where a bolt removal jig is connected to a bolt. [Figure 6] A cross-sectional view of a building's framework, showing a state where a bolt has been removed from the framework. [Figure 7A] A perspective view of a building's framework, showing a state where a first tool is connected to a bolt removal jig. [Figure 7B] A view showing a state where a bolt removal jig is connected to a bolt fastened to a building's framework. [Figure 7C] A view showing a state where a bolt has been removed from a building's framework. [Figure 8A] A perspective view of a building's framework, showing a state where a first tool and a second tool are connected to a bolt removal jig. [Figure 8B] A view showing a state where a bolt has been removed from a building's framework. [Figure 9] A perspective view of the bolt removal jig according to the second embodiment. [Figure 10] A perspective view of a building's framework, showing a state where a first tool and a second tool are connected to a bolt removal jig. <​​​​​​​​​​​​ <Overall Structure> As shown in Figures 1 to 6, the bolt removal jig 1 of this embodiment is used to remove double-threaded bolts B3, which are screw-fastened to columns B1 and beams B2 of the building's structural frame B, from columns B1 and beams B2 by rotating the tool. For example, as shown in Figures 5 and 6, the bolt removal jig 1 is used to efficiently remove double-threaded bolts B3 that are screw-fastened to columns B1 and beams B2 when a tightening defect (misalignment of the bolt axis) occurs.

[0017] As shown in Figures 1 and 2, the building's structural frame B comprises a vertically elongated column B1 and a beam B2 connected to the outer surface of column B1 and extending 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 plate B1a, which is fixed to the outer surface of the column B1, and the beam end plate B2a, which is fixed to one end of the beam B2 in the extending direction, are brought into contact, and the screw holes B1b of the column plate B1a and the through holes of the beam end plate B2a are connected, and the double-ended screw bolt B3 is fastened with screws, and the washer B4 and nut B5 are tightened, thereby connecting the column B1 and the beam B2.

[0018] 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 1, 2, 5, and 6). 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 reverse using a power tool to fasten the reverse thread B3c of the double-threaded bolt B3. At this time, 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 power tool, the double-threaded bolt B3 can be rotated by the power tool. Note that if a fastening 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 a power tool. 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 5, 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.

[0019] Referring to Figure 5, of the two double-threaded bolts B3, the lower double-threaded bolt B3 is screwed to the structure B without any axial misalignment. On the other hand, the upper double-threaded bolt B3 is screwed to the structure B with axial misalignment. In such cases, it is necessary to efficiently remove the double-threaded bolt B3, located on the upper side, from the structure B.

[0020] <Configuration of the bolt removal jig> As shown in Figures 3 to 6, the bolt removal jig 1 comprises a main body portion 10, a nut portion 20 provided at one end of the main body portion 10 in the extending direction for connecting to a double-threaded bolt B3, and a socket portion 30 provided at the other end of the main body portion 10 in the extending direction for connecting to a first tool T1. The nut portion 20 has an internal threaded portion 21 formed at the center of the nut portion 20 and connected to the right-hand thread B3b (connected portion) of the double-threaded bolt B3, and a hexagonal portion 22 formed on the outer surface of the nut portion 20 and connected to the second tool T2. The socket portion 30 has a connecting hole portion 31 formed at the center of the socket portion 30 and connected to the first tool T1.

[0021] In other words, the bolt removal jig 1 has the function of connecting to the double-threaded bolt B3, the function of connecting to the first tool T1, and the function of connecting to the second tool T2. Specifically, the bolt removal jig 1 includes a "bolt connection part" that is rotatable together with the double-threaded bolt B3 when connected to the double-threaded bolt B3, a "tool connection part" that is connected to the first tool T1 and is rotatable in conjunction with the rotational movement of the first tool T1 when connected to the first tool T1, and a "second tool connection part" that is connected to the second tool T2 and is rotatable in conjunction with the rotational movement of the second tool T2 when connected to the second tool T2. The "bolt connection part" corresponds to the internal threaded part 21, the "tool connection part" corresponds to the connection hole part 31, and the "second tool connection part" corresponds to the hexagonal part 22. Furthermore, the first tool T1 is, for example, an electric tool such as an impact wrench, and the second tool T2 is, for example, a manual tool such as a wrench or spanner.

[0022] With the above configuration, it becomes possible to remove double-threaded bolts B3 fastened to the building frame B using the bolt removal jig 1 shown in Figures 7A to 7C more efficiently than in the conventional method.

[0023] As shown in Figures 5 and 6, the bolt removal jig 1 is provided inside the internal thread portion 21 and further has a projection 23 that protrudes from the bottom surface of the internal thread portion 21 toward the opening and contacts the head surface of the double-threaded bolt B3 when the internal thread portion 21 is connected to the double-threaded bolt B3. As a result, when the bolt removal jig 1 is connected to the double-threaded bolt B3, the projection 23 comes into contact with the threaded head of the double-threaded bolt B3. Therefore, the contact area between the standard thread B3b of the double-threaded bolt B3 and the internal thread portion 21 of the bolt removal jig 1 can be reduced. In other words, it prevents the two from being tightened more than necessary. For example, after removing the double-threaded bolt B3 from the frame B, the bolt removal jig 1 can be easily removed from the double-threaded bolt B3.

[0024] <Bolt removal method (1)> Next, the bolt removal method (1) (building construction method) using the bolt removal jig 1 will be explained based on Figures 7A to 7C. The method includes at least the following steps: a "tool connection step" (Figure 7A) in which a first tool T1 is connected to a bolt removal jig 1; a "jig connection step" (Figure 7B) in which the bolt removal jig 1 is connected to a double-threaded bolt B3 having right-hand threads B3b and left-hand threads B3c that is screwed to the building frame B; and a "bolt removal step" (Figure 7C) in which the double-threaded bolt B3 is removed from the building frame B by the rotational movement of the first tool T1. A detailed explanation follows below. Regarding the construction of the building, explanations of construction processes other than those mentioned above will be omitted.

[0025] Figure 7A is a perspective view of the building's frame B, in which the upper of the two double-threaded bolts B3 is screwed to the frame B in an axially misaligned state. Note that, in order to remove the double-threaded bolt B3, the washer B4 and nut B5 have already been removed from the double-threaded bolt B3.

[0026] In the "tool connection process," as shown in Figure 7A, the worker connects the connection portion T1a (square protrusion) of the first tool T1 to the connection hole portion 31 (square hole portion) of the bolt removal jig 1. By doing so, the bolt removal jig 1 can rotate in conjunction with the rotational movement (electric rotational movement) of the first tool T1.

[0027] Then, in the "jig connection process," as shown in Figure 7B, the worker connects the internal thread portion 21 of the bolt removal jig 1 to the right-hand thread B3b (connected portion) of the double-threaded bolt B3 that is screw-fastened to the building frame B. Specifically, with the bolt removal jig 1 pressed against the double-threaded bolt B3, the bolt removal jig 1 is rotated forward by the rotational movement of the first tool T1, thereby screwing the internal thread portion 21 onto the right-hand thread B3b. Furthermore, when the internal thread portion 21 is connected to the double-threaded bolt B3 (right-hand thread B3b), the projection 23 comes into contact with the head surface of the right-hand thread B3b.

[0028] Then, in the "bolt removal process," as shown in Figure 7C, the worker removes the double-threaded bolt B3 from the frame B by rotating the first tool T1 while the bolt removal jig 1 is connected to the double-threaded bolt B3. Specifically, the rotational movement of the first tool T1 causes the bolt removal jig 1 and the double-threaded bolt B3 to rotate in the forward direction, thereby removing the double-threaded bolt B3 (reverse thread B3c), which is screwed into the frame B (reverse thread hole B1b), from the frame B.

[0029] With the bolt removal method described above, double-threaded bolts fastened to the building's structure can be efficiently removed using a bolt removal jig. In the bolt removal method described above, the "jig connection process" is performed after the "tool connection process," but this is not a limitation, and the "tool connection process" may be performed after the "jig connection process."

[0030] <Bolt removal method (2)> Next, a bolt removal method (2) using the bolt removal jig 1 will be explained based on Figures 8A and 8B. The method includes at least a "jig connection step" of connecting a bolt removal jig 1 to a double-threaded bolt B3 fastened to the building frame B, a "tool connection step" of connecting a first tool T1 and a second tool T2 to the bolt removal jig 1 (Figure 8A), and a "bolt removal step" of removing the double-threaded bolt B3 from the building frame B by the rotational movement of the first tool T1 and the second tool T2 (or the second tool T2 only) (Figure 8B). Note that any information that overlaps with the bolt removal method (1) described above will be omitted from the explanation.

[0031] In the "jig connection process," the worker connects the bolt removal jig 1 (internal thread portion 21) to the double-threaded bolt B3 (right-hand thread B3b) fastened to the building's structural frame B. The bolt removal jig 1 can be connected using the first tool or the second tool, other tools, or by hand. If using the first tool T1 or the second tool T2, the first tool T1 or the second tool T2 will be connected at this point.

[0032] Then, in the "tool connection process," as shown in Figure 8A, the worker connects the first tool T1 to the bolt removal jig 1 (connection hole portion 31) and the second tool T2 (connection portion T2a) to the bolt removal jig 1 (hexagonal portion 22). Furthermore, if, for example, the first tool T1 has already been connected in the "jig connection process," then only the second tool T2 will be connected in that process.

[0033] Then, in the "bolt removal process," as shown in Figure 8B, the worker removes the double-threaded bolt B3 from the frame B by rotating the first tool T1 and the second tool T2 (or the second tool T2 only) while the bolt removal jig 1 is connected to the double-threaded bolt B3. Specifically, the bolt removal jig 1 and the double-threaded bolt B3 are rotated in the forward direction by the rotational movement of the first tool T1 and the second tool T2, 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. By doing so, if the rotational motion of the first tool T1 alone is insufficient to rotate the double-threaded bolt B3 with a screw defect, the additional rotational motion of the second tool T2 can be used to rotate the double-threaded bolt B3, allowing it to be removed from the structure B. Alternatively, the double-threaded bolt B3 may be rotated solely by the rotational movement of the second tool T2.

[0034] The above bolt removal method allows for the efficient removal of double-threaded bolts that are firmly fastened to the building's structure using a bolt removal jig.

[0035] <Second embodiment of bolt removal jig> Next, the bolt removal jig 101 of the second embodiment will be described with reference to Figures 9 and 10. Note that explanations that overlap with the above-mentioned bolt removal jig 1 will be omitted.

[0036] The bolt removal jig 101 comprises a main body 110, a first nut portion 120 for connecting to the double-threaded bolt B3, a second nut portion 140 provided adjacent to the first nut portion 120 and arranged in communication with the first nut portion 120, and a socket portion 130 for connecting to the first tool T1. Functionally speaking, the bolt removal jig 101 includes a "bolt connection part" connected to the double-threaded bolt B3, a "tool connection part" connected to the first tool T1, a "second tool connection part" connected to the second tool T2, and a "third tool connection part" connected to the second tool T2. The "bolt connection portion" corresponds to the internal thread portion located at the center of the first nut portion 120 and the second nut portion 140, the "tool connection portion" corresponds to the connection hole portion 131, and the "second tool connection portion" corresponds to the hexagonal portion 122. The "third tool connection portion" corresponds to the hexagonal portion 142.

[0037] In the above configuration, as shown in Figure 9, the first nut portion 120 and the second nut portion 140 are positioned at different locations in the axial direction of the bolt removal jig 101. Furthermore, the corner positions (connection positions) of the hexagonal portion 122 of the first nut portion 120 and the corner positions (connection positions) of the hexagonal portion 142 of the second nut portion 140 are different in the rotational direction of the bolt removal jig 101. Specifically, they are positioned at a 30-degree offset in the above rotational direction (they may also be positioned at a 15-degree or 20-degree offset). Therefore, the second tool T2 (e.g., a wrench) can be connected to the second tool connection part (hexagonal part 122) or the third tool connection part (hexagonal part 142) as appropriate. In this way, the second tool T2 can be rotated appropriately while avoiding interference with the building frame B (e.g., the web B2c or flange B2d of beam B2).

[0038] Figure 10 is a perspective view of the frame B, showing the bolt removal jig 101 with the first tool T1 and the second tool T2 connected to it. In other words, the worker can remove the double-threaded bolt B3 from the frame B by rotating the first tool T1 and the second tool T2 while the bolt removal jig 101 is connected to the double-threaded bolt B3. At this time, the worker will be handling the first nut portion 120 (hexagonal portion 122) whose corner positions are different from each other. The second nut portion 140 (hexagonal portion 142) can be appropriately selected to connect the second tool T2. In other words, the second tool T2 can be rotated smoothly while being appropriately connected so as not to interfere with the structure B (beam B2, floor panel on beam B2).

[0039] <Other Embodiments> In the above embodiment, as shown in Figures 5 and 6, the bolt removal jig 1 is used to remove double-threaded bolts B3 fastened to columns B1 and beams B2 of the building's frame B, but it is not limited to columns B1 and beams B2. For example, the bolt removal jig 1 may be used when removing double-threaded bolts B3 fastened to the "first construction member" and the "second construction member" during the construction of a building. In other words, the first construction member and the second construction member may be any construction member of the structural frame B.

[0040] In the above embodiment, as shown in Figures 5 and 6, the bolt removal jig 1 is used to remove a double-threaded bolt B3 fastened to the building frame B, but the "shape of the double-threaded bolt" is not particularly limited. For example, a double-threaded bolt B3 is a bolt having a central part B3a (cylindrical part), a right-hand thread B3b, and a left-hand thread B3c, but it may also be a bolt having only a right-hand thread B3b and a left-hand thread (a so-called fully threaded bolt).

[0041] In the above embodiment, as shown in Figures 5 and 6, the bolt removal jig 1 is used when removing the double-threaded bolt B3, but it may also be used for "bolts other than double-threaded bolts". For example, the bolt removal jig 1 may be used to remove hexagonal bolts having a hexagonal head (connected part), hexagonal socket head bolts having a hexagonal hole (connected part), assembled screw bolts, etc. Specifically, if the bolt is a hexagonal bolt, the bolt removal jig should include a "bolt connection part (bolt connection hole)" that connects to the hexagonal part of the hexagonal bolt, a "tool connection part (tool connection hole)" provided on the opposite side of the "bolt connection part" and connected to the first tool T1, and a "second tool connection part (hexagonal part)" provided on the outer surface of the bolt removal jig and connected to the second tool T2. Even with the above configuration, bolts fastened to the building's structure can be efficiently removed using a bolt removal jig. Furthermore, by preferably using double-threaded bolts, the construction work (bolt fastening work) of the building can be carried out more efficiently.

[0042] In the above embodiment, as shown in Figure 3, the outer surface of the nut portion 20 is a hexagonal portion 22, but it is not limited to a hexagonal shape and can be changed. In other words, the outer surface of the nut portion 20 may have a polygonal shape other than a hexagon (for example, a square shape).

[0043] The above embodiments mainly described the bolt removal jig and bolt removal method 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]

[0044] 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 B2C Web B2d flange B3 Double-ended threaded bolt (bolt) B3a Central Area B3b Right-hand thread (connected part) B3c reverse thread B3d Pintail B4 Washer B5 Nut 1. 101 Bolt Removal Jig 10, 110 Main body 20, 120 Nut section 21 Internal thread section (bolt connection section) 22, 122 Hexagonal section (polygonal section, second tool connection section) 23 Protrusion 30, 130 socket section 31, 131 Connection hole section (tool connection section) 140 Second nut section 141 Internal thread section (bolt connection section) 142 Hexagonal section (polygonal section, third tool connection section) T1 First Tools (Impact wrenches, power tools) T1a connection part T2 Second-tier tools (wrenches, spanners, hand tools) T2a connection part

Claims

1. A bolt removal jig used to remove bolts fastened to the building frame by the rotational motion of the tool, A bolt connection part is connected to a connection part provided on the head of the bolt, and is rotatable together with the bolt when connected to the bolt, The bolt removal jig includes a tool connection portion provided on the opposite side from the bolt connection portion, connected to a first tool, and which, when connected to the first tool, is rotatable integrally with the bolt connection portion in conjunction with the rotational movement of the first tool; A bolt removal jig characterized by comprising: a second tool connection portion provided on the outer circumferential surface of the bolt removal jig, connected to a second tool, and capable of rotating integrally with the bolt connection portion in conjunction with the rotational movement of the second tool when connected to the second tool.

2. The bolt removal jig according to claim 1 is characterized in that it is used when removing a double-threaded bolt having both a standard thread and a reverse thread, which is screwed to the building structure, from the building structure by the rotational movement of the first tool and / or the second tool.

3. The bolt removal jig has a nut portion, The bolt connection portion is an internal threaded portion located at the center of the nut portion, and is connected to one of the threads of the double-threaded bolt. The bolt removal jig according to claim 2, characterized in that the second tool connection portion is a polygonal polygonal portion provided on the outer circumferential surface of the nut portion and is connected to a wrench or spanner as the second tool.

4. The bolt removal jig according to claim 3, further comprising a projection provided inside the internal thread portion, protruding from the bottom surface of the internal thread portion toward the opening, and contacting the head surface of the bolt when the internal thread portion is connected to the bolt.

5. The bolt removal jig is connected to the bolt along the axial direction of the bolt, The bolt removal jig further comprises a third tool connection portion provided on its outer circumferential surface, positioned in a different location in the axial direction from the second tool connection portion, connected to the second tool, and rotatable in conjunction with the rotational movement of the second tool when connected to the second tool. The bolt removal jig according to any one of claims 1 to 4, characterized in that the connection position of the second tool connection portion to the second tool and the connection position of the third tool connection portion to the second tool are different in the direction of rotation of the bolt.

6. The bolt removal jig has a first nut portion and a second nut portion provided adjacent to the first nut portion and arranged in communication with the first nut portion. The bolt connection portion is an internal threaded portion provided at the center position of the first nut portion and the second nut portion, and is connected to one of the threads of a double-threaded bolt having a standard thread and a reverse thread. The second tool connection portion is a polygonal portion provided on the outer circumferential surface of the first nut portion, and is connected to a wrench or spanner as the second tool. The third tool connection portion is a polygonal portion provided on the outer circumferential surface of the second nut portion, and is connected to a wrench or spanner as the second tool. The bolt removal jig according to claim 5, characterized in that the angular position of the polygonal portion of the second tool connection portion and the angular position of the polygonal portion of the third tool connection portion are different in the direction of rotation of the bolt.

7. A method for removing a bolt using a bolt removal jig according to any one of claims 1 to 6, A jig connection step involves connecting the bolt removal jig to a double-threaded bolt having both right-hand and left-hand threads that is screw-fastened to the building's frame, A tool connection step involves connecting the first tool and / or the second tool to the bolt removal jig, The process includes a bolt removal step of removing the two screw bolts from the frame by the rotational movement of the first tool and / or the second tool, In the jig connection step, the bolt removal jig is connected to one of the threads of the double-threaded bolt, and the double-threaded bolt and the bolt removal jig are integrated together. A bolt removal method characterized in that, in the bolt removal step, the rotational movement of the tool causes one of the double-threaded bolts to rotate in the forward direction, thereby causing the other thread of the double-threaded bolt fastened to the building structure to rotate in the reverse direction and remove the double-threaded bolt.

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