JP7621661B2 - Reaction jig - Google Patents

Description

This invention relates to a reaction jig.

A column joint structure has been known in which a joint consisting of a cross-shaped cross section and an end plate is provided at one end of one of the columns to be joined, which is made of square steel pipes, and the end plate of the joint is overlapped with the end plate of one end of the other column and joined with a tension bolt (Patent Document 1).

On the other hand, a hydraulic torque wrench is used as a tool for tightening the tension bolts (Patent Documents 2 to 5).
The hydraulic torque wrench includes a casing, a piston housed in the casing and hydraulically moved linearly relative to the casing, an annular rotor housed in the casing, and a reverse prevention mechanism such as a ratchet mechanism or ball lock device that converts the linear motion of the piston into rotational motion to rotate the rotor relative to the casing, and the rotor is fitted onto a nut to rotate the nut and tighten the bolt. When the nut rotates, a part of the surface of the casing abuts against another part as an abutment surface, and receives a reaction force against the rotational force of the rotor.

Japanese Patent Application Publication No. 5-39633 Japanese Patent Application Publication No. 62-44378 Special table 2018-517577 publication Special table 2016-516604 publication Patent No. 5647228

However, in the column joint structure shown in Patent Document 1, a joint portion consisting of a cross-shaped cross-section portion and an end plate is provided at one end of one of the columns to be joined, which is made of square steel pipes, and the end plate of the joint portion is overlapped on the end plate of one end of the other column and joined with four tension bolts. Each of the rear ends of the shafts of the four tension bolts protrudes from the face opposite the joint face of the joint side end plate into each of the four spaces partitioned by the cross of the cross-shaped cross-section portion, and a nut is fitted into each of them. The joint is performed by tightening the nuts, which is a complex configuration.
For this reason, in order to smoothly and reliably tighten the tension bolts using the hydraulic torque wrench, it was considered necessary to either create an optimal attachment for receiving the reaction force and attach it to the hydraulic torque wrench, or to improve the hydraulic torque wrench so that it is optimally configured to receive the reaction force.
Attaching the above-mentioned attachment to the hydraulic torque wrench in order to adapt it to the column joining structure of Patent Document 1, and improving the hydraulic torque wrench itself, are not negligible in terms of cost and effort.
Therefore, the present invention aims to solve the above problem by providing a reaction force jig that enables the generation of an appropriate reaction force easily by using an existing hydraulic torque wrench when tightening a tension bolt in the above-mentioned column joint structure, without having to attach a configuration to the hydraulic torque wrench that is adapted to the column joint structure or modify the hydraulic torque wrench.

In the present invention, a reaction tool is provided for tightening the tension bolts with a hydraulic torque wrench in a column connection structure in which a joint part consisting of a cross-shaped cross section and an end plate is provided at one end of one column to be joined, the end plate of the joint part being overlapped with an end plate of one end of the other column and joined with a tension bolt, the column connection structure is such that the end plate of the joint part is the joint side end plate and the end plate of one end of the other column is the other side end plate, and a plurality of tension bolts are passed through the overlapped joint side end plate and the other side end plate, and each of the rear ends of the shafts of the plurality of tension bolts is inserted into the cross-shaped cross section part from a surface of the joint side end plate opposite to a joining surface facing the other side end plate. The hydraulic torque wrench includes a casing, an annular rotating body that is accommodated in the casing and rotates by receiving hydraulic pressure directly or indirectly, and a reverse prevention mechanism such as a ratchet mechanism that rotates the rotating body in one direction, and the rotating body is fitted onto the nut to rotate the nut and perform the tightening. When the nut rotates, a part of the surface of the casing abuts against another part as an abutment surface, thereby receiving a reaction force against the rotation of the rotating body. The nut tightened by the hydraulic torque wrench is called a tightening target nut. a nut adjacent to the nut to be tightened across one of the four pieces constituting the cross of the cross-shaped cross section is defined as an adjacent nut, and a nut adjacent to the adjacent nut on the opposite side of the nut to be tightened across the other one of the four pieces constituting the cross together with the adjacent nut is defined as a secondary adjacent nut; the reaction force jig is formed separately from the hydraulic torque wrench and detachably attached to the joint portion, and generates the reaction force by abutting against the abutment surface of the torque wrench, the reaction force jig having a first portion, a second portion, and a connecting portion connecting the second portion to the first portion, the first portion being a first portion that receives the adjacent nut, a receiving portion, the second portion having a second receiving portion which receives the secondary adjacent nut, and when the reaction force jig is attached to the joint portion, the connecting portion can avoid the other one of the four pieces which form the cross between the adjacent nut and the secondary adjacent nut and receive the secondary adjacent nut into the first receiving portion and the second receiving portion, and the first portion has an extension portion on the opposite side of the connecting portion of the first portion which extends radially outwardly of the square steel pipe beyond the one of the pieces which form the cross between the target nut and the adjacent nut , and the extension portion has a reaction force generating surface which abuts against the abutment surface.
In addition, in the present invention, when attached to the joint portion of the reaction force jig, the first part and the second part each have a protruding portion that protrudes from the square steel pipe in the radially outward direction of the square steel pipe, and by providing the connecting part between the two protruding portions, it is possible to provide a reaction force jig in which the connecting part avoids the other one of the four pieces that form the cross between the adjacent nut and the secondary adjacent nut.
Furthermore, in the present invention, when the axial direction of the square steel pipe is the up-down direction and one column having the joint part is joined to the upper end of the other column, the cross-shaped cross section of the joint part, which is cross-shaped in plan view, extends downward from the end of the one column having the joint part, and the joint side end plate is welded to the lower end of the cross-shaped cross section, the reaction jig is formed in a plate shape having a substantially rectangular shape in plan view, and the thickness of the reaction jig is the rear part of the axis of each of the tension bolts protruding upward from the upper surface of the joint side end plate. The distance between each of the nuts fitted on the end and the shaft of the reaction jig and the one end of the one of the columns having the joint portion is smaller than the distance between each of the nuts fitted on the end and the shaft of the reaction jig and the one end of the one of the columns having the joint portion, and each of the first receiving portion and the second receiving portion is a through portion penetrating from the upper surface to the lower surface of the reaction jig, and the extension portion, the first portion, the connecting portion, and the second portion are provided in this order along the longitudinal direction of the rectangle, and between the first portion and the second portion, a recessed portion recessed from one long side of the rectangle toward the other long side thereof and the connecting portion are provided. The connecting portion connects the first portion and the second portion on the other long side side of the setback portion, and the other one of the four pieces constituting the cross between the adjacent nut and the secondary adjacent nut can be inserted into the setback portion. The connecting portion is provided with an insertion guide surface that gradually widens the width in the longitudinal direction toward the one long side side of the setback portion. The reaction jig is inserted between the rear end of the shaft of the tension bolt, the nut fitted on the shaft, and the one end of the one column having the joint portion. The reaction force jig can be attached to the joint portion by inserting the reaction force jig into the first receiving portion and pushing down the reaction force jig to receive the adjacent nut and the secondary adjacent nut into the first receiving portion and the second receiving portion, respectively, and the reaction force generating surface is a flat surface in the extension portion where the corner of the rectangle of the reaction force jig that is closest to the nut to be tightened is beveled off, and a reaction force jig has been provided in which, when the reaction force jig is attached to the joint portion, the abutment surface of the hydraulic torque wrench can be faced to the reaction force generating surface.
In the above description, the axial direction of the square steel pipe is set to the up-down direction (vertical direction) for the convenience of explaining the relative positional relationship of each component of the invention, but this does not exclude the case where the axial direction of each steel pipe extends horizontally or obliquely. Also, one column having the joint part may be joined to the lower end of the other column.

In the present invention, a joint portion consisting of a cross-shaped cross-section and an end plate is provided at one end of one of the columns to be joined, which are made of square steel pipes, and the end plate of the joint portion is overlapped on the end plate of one end of the other column and joined with a tension bolt, and each of the rear ends of the shanks of the multiple tension bolts protrudes from the face opposite the joining face of the joint side end plate into each of the four spaces partitioned by the crosses of the cross-shaped cross-section portion, and a nut is fitted into each of them and the joining is performed by tightening the nuts.In this column joining structure, when tightening the tension bolt, two nuts (adjacent nut and secondary adjacent nut) other than the nut to be tightened (the nut to be tightened) are attached to the first and second receiving portions, so that the reaction force jig can be positioned with respect to the joint portion at two points, and the contact surface of the hydraulic torque wrench can be stably contacted with the reaction force generating surface, thereby reliably applying a reaction force to the contact surface.
In other words, the present invention provides a reaction jig that is not fixed to an existing hydraulic torque wrench, but can be detachably attached to the joint when tightening the tensile bolt, allowing the tightening to be performed with an existing hydraulic torque wrench.
According to the present invention, it is now possible to simply tighten the tensile bolts of the column joint structure shown in Patent Document 1 by using an existing hydraulic torque wrench as is, without modifying it or attaching any attachments.

1A is a plan view of a reaction force jig according to one embodiment of the present invention, FIG. 1B is a front view of the reaction force jig of FIG. 1A, and FIG. (A) is a side view showing a square steel pipe column before joining, and (B) is a yy cross-sectional view of (A). 2(A) is a side view of the square steel pipe column in FIG. 2(A) with a tension bolt attached, and (B) is a z-z cross-sectional view of (A). FIG. 4 is a plan view showing the state in which the reaction jig of FIG. 1 is attached to the square steel pipe of FIG. 3(B) before using a hydraulic torque wrench. FIG. 4 is a plan view showing a hydraulic torque wrench in use.

Hereinafter, the most preferred embodiment of the reaction jig according to the present invention will be described.
For ease of explanation, in the drawings, U indicates the upper side, S indicates the upper side, F indicates the front side, B indicates the rear side, R indicates the right side, and L indicates the left side.
The reaction force jig g according to the present invention is a metal plate that is approximately rectangular in plan view and is formed separately from the hydraulic torque wrench m (FIGS. 1 and 4).
The reaction jig g includes a first portion 1, a second portion 2, and a connecting portion 3 that connects the second portion 2 to the first portion 1 (FIG. 1). The reaction jig g also includes an extension portion 7 that extends from the first portion 1 to the opposite side to the connecting portion 3 (the second portion 2 side).
As shown in Figure 1, if the left and right (L, R) directions are explained as the directions in which the long sides of the above-mentioned rectangle extend, in the reaction force jig g, the various areas are arranged from right to left in the following order: extension portion 7, first portion 1, connecting portion 3, and second portion 2.

In the following description, the rectangle presented by the reaction force jig g has a pair of long sides designated as g3 and g4, and a pair of short sides designated as g5 and g6, and in a planar view, the back side of the reaction force jig g is one of the long sides g3, and the front side of the reaction force jig g is the other long side g4.
The first part 1 has a (first) protruding part 5 extending toward the rear B. The second part 2 has a (second) protruding part 6 extending toward the rear B. Both protruding parts 5, 6 have a protruding width t8 that protrudes laterally from the joint part kt of the column k1 described below when the reaction jig g is attached to the joint part kt. In a plan view, the rear ends of both protruding parts 5, 6, the rear end of the connecting part 3, and the rear end of the extension part 7 are in a straight line to constitute the one long side g3.

The front-to-rear (F, B) width of the connecting portion 3 is approximately the same as or slightly smaller than the overhang width t8, so that a recessed portion 4 is provided between the first portion 1 and the second portion 2, recessed from the front side of the reaction jig g to the back side. In other words, a space serving as the recessed portion 4 is provided between the first portion 1 and the second portion 2 on the side of the other long side g4 from the front end of the connecting portion 3.

The front end of the first portion 1 and the front end of the second portion 2 are on the same straight line. The setback width t3 of the setback portion 4 from the straight line, i.e., the front-to-rear width of the setback portion 4, is set to be approximately the same as or slightly larger than the length from the straight line in a plan view of one of the wing-shaped portions k13a of the cross-shaped cross section portion k13 of the joint portion kt of the column k1, which will be described later.
The recessed portion 4 has inclined surfaces formed as insertion guide surfaces 40, 40 so that the left-right width of the recessed portion 4 gradually increases toward the other long side g4.

The first part 1 is provided with a first receiving part 10 as a through-hole that penetrates the first part 1 vertically (from the upper surface g1 to the lower surface g2 of the reaction jig g). The second part 2 is provided with a second receiving part 20 as a through-hole that penetrates the second part 2 vertically (from the upper surface g1 to the lower surface g2 of the reaction jig g). The first receiving part 10 and the second receiving part 20 are circular in plan view, and the diameter r of the first receiving part 10 and the second receiving part 20 is the same as or slightly larger than the maximum diameter of the nut n described later.
The thickness t9 of the reaction jig g (between the upper surface g1 and the lower surface g2) is smaller than the distance h (Figure 3 (A)) between the end k12 of the first column k1 described later and the rear end (shaft end; in the illustrated example, the upper end) of the bolt b protruding upward from the first end plate k11.

In a plan view of the reaction force jig g, one corner of the rectangle where the other short side g6 on the first part 1 side opposite to the one short side g5 on the second part 2 side intersects with the front end of the extension part 7 is rounded off. That is, instead of a corner of the rectangle, an inclined surface that is oblique to both the other short side g6 and the extension part 7 is provided between the other short side g6 and the extension part 7 as a reaction force generating surface 8. The reaction force generating surface 8 is a surface that faces and comes into contact with the contact surface m5 of the hydraulic torque wrench g when the hydraulic torque wrench g described later is used.
In a plan view, it is desirable to set the included angle θ of the reaction force generating surface 8 with respect to the other short side g6 so that the reaction force generating surface 8 is oriented in a direction that allows surface contact with the abutment surface m5.

In this example, the other long side g4 of the approximately rectangular reaction jig g when viewed in a plane is formed in a state in which the section other than the front end of the extension portion 7, i.e., the front ends (including the above-mentioned straight lines) of the first part 1 and the second part 2, are set back rearward B from the front end of the extension portion 7, and the extension portion 7 is provided with a wraparound portion 71 that protrudes relatively further forward F than the front ends of the first part 1 and the second part 2.
The wrap-around portion 71 wraps around the lateral tip of the wing-shaped portion k13a located between the nut n1 to be tightened and the adjacent nut n2 in Figure 5 described later, in the cross-shaped cross-sectional portion k13 of the joint part kt described later, and the reaction force generating surface 8 is positioned at a position where the abutment surface m5 of the hydraulic torque wrench m described later is not obstructed by the tip of the wing-shaped portion k13a.
In other words, when the reaction force jig g is used, a reaction force generating surface 8 is formed on the wraparound portion 71 at the extension portion 7, which is extended radially outward from the wing-shaped portion k13a between the nut n1 to be tightened and the adjacent nut n2, so that the hydraulic torque wrench m does not come into contact with the tip of the wing-shaped portion k13a.

In the above-mentioned substantially rectangular shape of the reaction jig g, a pair of long sides are g3 and g4, and a pair of short sides are g5 and g6. In a plan view, the back side of the reaction jig g is one of the long sides g3, and the front side of the reaction jig g is the other long side g4. In this example, the corner between the long side g3 on the back side and one short side g5 is rounded, and the corner between the long side g3 and the other short side g6 is also rounded. Furthermore, as described above, in a plan view, the area between the wraparound portion 71 of the extension portion 7 and the other short side g6 is also obliquely dropped with respect to the long side g4 and the short side g6 to form the reaction force generating surface 8. Furthermore, as described above, the long side g4 on the front side is also recessed toward the long side g3 on the back side in the section other than the wraparound portion 71, and the recessed portion 4 is further formed. The corner between the long side g4 and the one short side g5 is also rounded.
Therefore, the reaction force jig g is not strictly rectangular in plan view. However, for convenience of explanation, the reaction force jig g is assumed to be "approximately" rectangular in plan view as described above, and as long as the positional relationship of each part is appropriate in plan view, a reaction force jig g that is not strictly rectangular is also included in this example.

In normal use, the longitudinal length t1 of the reaction jig g is preferably 10 cm to 50 cm, and the short side width, ie, the front-to-rear width t2 of the reaction jig g is preferably 5 cm to 30 cm.
However, the length of the long side g3, i.e., the longitudinal length t1 of the reaction jig g, and the front-to-rear width t2 may be appropriate depending on the size of the column used, and may be outside the above range.

In particular, for a joint part kt (Figure 2) of a column k1 made of a general rectangular steel pipe having a square cross section with sides of 12 to 13 cm, the reaction jig g was able to be implemented with the longitudinal length t1 of 210 mm, the front-to-rear width t2 of 112 mm, the thickness t9 of 30 mm, the setback width t3 from the straight line (the front ends of the first part 1 and the second part 2) of 58 mm, the setback width t7 of the straight line from the other long side g4 of 23 mm, the longitudinal width (left-to-right width) t4 of the connecting part 3 and the setback part 4 of 38 mm, the left-to-right width of the extension part 7, i.e., the longitudinal extension width t5 of 54.5 mm, the left-to-right width t6 of the front end of the extension part 7 of 22 mm, and the inner diameter of the first receiving part 10 and the second receiving part 20 of 38 mm.

(Column joint structure)
In this example, we will explain the joining of two columns, columns k1 and k2 (FIG. 2(A)). The ends of the columns k1 and k2 are butted together and joined by a bolt b to form a single column (FIGS. 3(A) and 3(B)).
Hereinafter, the joining structure of the columns will be described using as an example a case where one column k2 is joined to the lower end of another column k1 extending vertically.
The end plate k11 which forms the end face (lower end face) of one of the columns k1 and provides a joint surface, and the end plate k21 which forms the end face (upper end face) of the other column k2 and provides a joint surface are stacked together, and four bolts b are passed through both end plates k11, k21 (Figures 2(A)(B), Figures 3(A)(B)) and tightened with nuts.

In detail, the one column k1 (hereinafter referred to as the first column k1 as necessary) comprises a first column body k10 which is a square steel pipe, an end portion k12 which closes the lower end of the first column body k10, and a joint portion kt provided at the end portion k12. The end portion k12 is a steel material welded to the lower end of the first column body k10. The joint portion kt comprises a steel cross-shaped cross-section portion k13 which extends downward from the lower surface of the end portion k12 and has a cross section, and the end plate k11 (hereinafter referred to as the first end plate k11) provided at the lower end of the cross-shaped cross-section portion k13.
The end portion k12, the cross-shaped cross-section portion k13, and the first end plate k11 are integrally formed by machining. However, for convenience of explanation, the portion below the cross-shaped cross-section portion k13 (the second column k2 side) is called the end plate (first end plate k11) as described above.

The cross-shaped cross-section k13 is composed of four wing-like portions k13a extending horizontally, i.e., in four directions (front, back, left, right) perpendicular to the extension line (a virtual line shown by a two-dot chain line in FIG. 2(A)) of the center line passing through the center, with the intersection point where a pair of diagonals of the rectangular first column body k10 intersect in the cross section of the first column body k10 as the center (FIG. 2(B)). The four wing-like portions k13a correspond to the "four pieces constituting a cross" in the claims. In this example, the tip side in the horizontal direction of each of the wing-like portions k13a intersects with each of the four sides of the rectangular first end plate k11 in a plan view as perpendicular lines to the four sides. In this example, the base end side in the horizontal direction of the wing-like portions k13a constitutes a columnar portion k13b having a rectangular cross section. Each of the four corners of the rectangular columnar portion k13b protrudes laterally from the base ends of adjacent wing-shaped portions k13a.

Four holes k14 for the bolts b (FIGS. 3(A) and 3(B)) pass through the first end plate k11 of the joint part kt from top to bottom (FIGS. 2(A) and 2(B)). Each hole k14 opens into four spaces partitioned by the cross-shaped cross-section part k13 on the upper surface of the first end plate k11.

The other column k2 (hereinafter referred to as the second column k2 as necessary) comprises a second column body k20 which is a square steel pipe, and an end plate k21 (hereinafter referred to as the second end plate k21) which is welded to the upper end of the second column body k20 to close the upper end.
Four holes k22 for receiving bolts b (FIGS. 3A and 3B) penetrate the second end plate k21 vertically (FIG. 2A). Each hole k22 is provided at a position corresponding to each hole k14 of the first end plate k11 when the second end plate k21 is overlapped with the first end plate k11. Each hole k22 of the second end plate k21 is provided with a female screw.

In this example, the bolt b is a double-threaded bolt (stud bolt/implanted bolt), that is, a shaft with male threads at both ends. When joining the two columns k1 and k2, first, the bolt b is screwed into the female threads of the holes k22 of the second end plate k21, thereby standing each bolt b on the second edge plate k2, and the upper end side of the bolt b is passed through each hole k14 of the first end plate k11. In this way, the first end plate k11 is stacked on the second end plate k21. Then, a nut n is fitted onto the axial end (upper end) of the bolt b that protrudes from the first end plate k11 into the partitioned space above. That is, the female thread of each nut n is screwed into the male thread on the upper end (rear end) side of each bolt b.

(Hydraulic torque wrench m)
As shown in FIG. 4, the hydraulic torque wrench m that tightens each of the nuts n includes a casing m1, a piston (not shown) that is housed in a casing m2 and moves linearly relative to the casing m1 by hydraulic pressure, an annular rotating body m2 housed in the casing m1, and a reverse rotation prevention mechanism (not shown) such as a ratchet mechanism or a ball lock device that converts the linear motion of the piston into rotational motion to rotate the rotating body relative to the casing m1.
In the figure, m4 denotes a hydraulic pressure supply section which supplies the above hydraulic pressure to the hydraulic torque wrench m from elsewhere.

The casing m1 has a hole (wrench hole m3) that exposes the hollow portion of the annular rotor m2 to the outside. The rotor m3 can be fitted to the nut n by fitting the nut n into the wrench hole m3 (FIG. 5). In this example, a pair of wrench holes m3 are provided concentrically on the upper and lower surfaces of the casing m1.
An abutment surface m5 is formed on the side of the casing m1, which receives a reaction force from the portion exposed laterally from the joint portion kt of the casing m1 when the casing m1 is fitted onto the nut n that tightens the rotating body m3 (Figures 4 and 5).

(Example of using reaction jig g)
Hereinafter, the nut n to be tightened is called the tightening target nut n1, the adjacent nut n is called the adjacent nut n2, and the nut n adjacent to the tightening target nut n1 on the opposite side to the adjacent nut n2 is called the secondary adjacent nut n3. Also, the remaining one of the four nuts n is called the non-involved nut n4.

The first part 1 of the reaction jig g is inserted as a first insertion part into the space where the adjacent nut n2 is located between the end k12 of the first column k1 and the rear end (upper end) of the adjacent bolt b protruding upward from the first end plate k11, and the second part 2 of the reaction jig g is inserted as a second insertion part into the space where the secondary adjacent nut n3 is located between the end k12 and the rear end (upper end) of the secondary adjacent bolt b protruding upward from the first end plate k11. At the same time as the insertion, one of the wing-shaped parts k13a that partitions the adjacent nut n2 and the secondary adjacent nut n3 is inserted into the recessed part 4 (FIG. 4).
After each of the above insertions, the reaction force jig g is pressed down against the joint portion kt, thereby receiving the adjacent nut n2 into the first receiving portion 10 of the reaction force jig g, and receiving the secondary adjacent nut n3 into the second receiving portion 20 of the reaction force jig g, thereby completing the attachment of the reaction force jig g to the joint portion kt.

After the reaction jig g is attached to the joint kt, the wrench hole m3 of the hydraulic torque wrench m is fitted into the nut n1 to be tightened, the nut n1 is fitted to the rotating body m2, and the contact surface m5 is brought into contact with the reaction force generating surface 8 of the reaction jig g. The hydraulic torque wrench m is then operated to rotate the rotating body m2 and tighten the nut n1 to the bolt (Figure 5).

When the above tightening is completed, for example, the nut n that was the non-involved nut n4 above becomes the next tightening target nut n1, the nut n that was the tightening target nut n1 above becomes the next adjacent nut n2, and the nut n that was the adjacent nut n2 above becomes the next secondary adjacent nut n3, and the reaction force jig g is attached and the hydraulic torque wrench m is used. When the tightening is completed, the other nuts n that have not been tightened can be successively made the tightening target nuts n1, the attachment position of the reaction force jig g relative to the joint part kt can be changed successively, and tightening can be performed with the hydraulic torque wrench m.
When loosening the nut n with a hydraulic torque wrench m, the reaction tool g can be used upside down from the above example shown in the figure.
In addition, when joining the first column k1 having the joint portion kt to the lower end of the second column k2, the reaction jig g is turned upside down and the nut n is tightened with the hydraulic torque wrench m.

(Example of change)
In the illustrated embodiment, the first receiving portion 10 and the second receiving portion 20 are through-holes that penetrate from the upper surface g1 to the lower surface g2 of the reaction jig g. The first receiving portion 10 and the second receiving portion 20 may be formed as a recess that is recessed upward on the lower surface g2 of the reaction jig g, provided that the first receiving portion 10 and the second receiving portion 20 can receive a nut that is passed through the shaft of a bolt.
In addition, instead of providing the above-mentioned protruding portions 5, 6 on the first portion 1 and the second portion 2, the connecting portion 3 may be formed in a curved state so as to bypass the wing-shaped portion k13a in a plan view.

Furthermore, the reaction force jig g is not limited to having an outline that is approximately rectangular when viewed in a plan view as described above, but may be approximately square, approximately trapezoidal, or other approximately polygonal, or may have an outline that is curved overall, or may be a combination of curves and straight lines other than those mentioned above.
In addition, the wing-shaped portion k13a of the cross-sectional portion k13 of the joint portion kt to which the reaction jig g is attached can be implemented as being provided in a direction that coincides with each of a pair of diagonals of the first end plate k11, which is approximately rectangular in plan view, unlike what is shown in Figures 2(B) and 3(B).

(Summary)
The present invention aims to provide a reaction force jig (g) which is formed separately from the hydraulic torque wrench, can be detachably attached to the joint of each steel pipe column, and can reliably apply a reaction force to the hydraulic torque wrench.
That is, the reaction jig g according to the present invention comprises a first receiving portion for receiving the adjacent nut n2 in the first portion 1, a second receiving portion 20 for receiving the secondary adjacent nut n3 in the second portion 2, and a recessed portion 4 for avoiding the wing-like portion k13a of the cross-shaped cross section portion k13 of the column k1 is provided together with a connecting portion 3 between the first portion 1 and the second portion 2. An extension portion 7 is provided on the opposite side of the first portion 1 to the second portion 2, which extends radially outward from the wing-like portion k13a between the nut n1 to be tightened and the adjacent nut n2, and the extension portion 7 comprises a reaction force generating surface 8 that abuts against the abutment surface m5 of the hydraulic torque wrench m.

Bolt
g Reaction jig g1 (of reaction jig g) upper surface g2 (of reaction jig g) lower surface g3 (one of the long sides of reaction jig g) g4 (the other of the long sides of reaction jig g) g5 (one of the short sides of reaction jig g) g6 (the other of the short sides of reaction jig g) k1 (first) column k2 (second) column kt joint part k10 first column body k11 first end plate k12 end part k20 second column body k13 cross-shaped cross section part k13a wing-shaped part k14 (of first end plate k11) hole k21 (of second end plate k21) hole
m Hydraulic torque wrench m1 Casing m2 Rotor m3 Wrench hole m4 Hydraulic pressure supply part m5 Contact surface
n Nut n1 Nut to be tightened n2 Adjacent nut n3 Sub-adjacent nut n4 Non-involved nut r Inner diameter (of first receiving portion 10 and second receiving portion) 1 First portion 2 Second portion 3 Connecting portion 4 Setback portion 5 (First) protruding portion 6 (Second) protruding portion 7 Extension portion 8 Reaction force generating surface 10 First receiving portion 20 Second receiving portion 40 Guide surface 71 Wraparound portion

Claims (3)

A reaction tool used for tightening a tension bolt with a hydraulic torque wrench in a column joint structure in which a joint part consisting of a cross-shaped cross section and an end plate is provided at one end of one column to be joined, the end plate of the joint part being overlapped with an end plate of one end of the other column and joined with a tension bolt,
The column joint structure has an end plate of the joint portion as a joint-side end plate and an end plate of one end of the other column as the other-side end plate, and a plurality of tension bolts are passed through the overlapping joint-side end plate and the other-side end plate, and each of the rear ends of the shanks of the plurality of tension bolts protrudes from a surface of the joint-side end plate opposite to a joint surface facing the other-side end plate into each of four spaces partitioned by the cross of the cross-shaped cross-sectional portion, and a nut is fitted into each of the spaces,
The hydraulic torque wrench includes a casing, an annular rotating body that is housed in the casing and rotates by receiving hydraulic pressure directly or indirectly, and a reverse prevention mechanism such as a ratchet mechanism that rotates the rotating body in one direction, and the rotating body is fitted onto the nut to rotate the nut and perform the tightening. When the nut rotates, a part of the surface of the casing abuts against another part as an abutment surface, thereby receiving a reaction force against the rotation of the rotating body.
The nut tightened by the hydraulic torque wrench is the target nut to be tightened, one nut adjacent to the target nut across one of the four pieces constituting the cross of the cross-shaped cross section is the adjacent nut, and a nut adjacent to the adjacent nut on the opposite side of the target nut to be tightened across another one of the four pieces constituting the cross together with the adjacent nut is the secondary adjacent nut, the reaction force jig is formed separately from the hydraulic torque wrench and is detachably attached to the joint portion, and generates the reaction force by abutting against the abutment surface of the torque wrench, the reaction force jig having a first part, a second part, and a connecting part connecting the second part to the first part,
the first portion includes a first receiving portion for receiving the adjacent nut, and the second portion includes a second receiving portion for receiving the secondary adjacent nut;
When the reaction jig is attached to the joint, the connecting portion can avoid the other one of the four pieces that form the cross between the adjacent nut and the secondary adjacent nut, and can receive the adjacent nut in the first receiving portion and the secondary adjacent nut in the second receiving portion,
A reaction jig is provided on the opposite side of the first part from the connecting portion, with an extension portion extending radially outwardly of the square steel pipe beyond one of the pieces that constitute the cross between the target nut and the adjacent nut, and the extension portion has a reaction force generating surface that abuts against the abutment surface . A reaction jig as described in claim 1, wherein when attached to the joint portion of the reaction jig, the first part and the second part each have a protruding portion that protrudes from the square steel pipe in the radially outward direction of the square steel pipe, and the connecting portion is provided between the two protruding portions, so that the connecting portion avoids the other one of the four pieces that form the cross between the adjacent nut and the secondary adjacent nut. When the axial direction of the square steel pipe is the up-down direction and one column having the joint portion is joined to the upper end of the other column, the cross-shaped cross-section of the joint portion, which presents a cross in a plan view, extends downward from the end of the one column having the joint portion, and the joint-side end plate is welded to the lower end of the cross-shaped cross-section,
The reaction jig is formed in a plate shape having a generally rectangular shape in a plan view, the thickness of the reaction jig is smaller than the distance between the rear ends of the shafts of the tension bolts protruding upward from the upper surface of the joint side end plate and the nuts fitted onto the shafts, and the one end of the one column having the joint portion, and each of the first receiving portion and the second receiving portion is a through portion penetrating from the upper surface to the lower surface of the reaction jig,
the extension portion, the first portion, the connecting portion, and the second portion are provided in this order along the longitudinal direction of the rectangle, and between the first portion and the second portion, there is provided a recessed portion that recesses from one long side of the rectangle toward the other long side, and the connecting portion, and the connecting portion connects the first portion and the second portion on the other long side side of the recessed portion,
The other of the four pieces constituting the cross between the adjacent nut and the secondary adjacent nut can be inserted into the recessed portion, and an insertion guide surface is provided which gradually widens the width in the longitudinal direction toward the one long side of the recessed portion,
The reaction jig is inserted between the rear end of the shaft of the tension bolt, the nut fitted to the shaft, and the one end of the one column having the joint portion, and the reaction jig is pushed down to receive the adjacent nut and the sub-adjacent nut in the first receiving portion and the second receiving portion, respectively, so that the reaction jig can be attached to the joint portion,
A reaction force tool as described in claim 2, wherein the reaction force generating surface is a flat surface formed by slantingly cutting off one corner of the rectangular reaction force tool that is closest to the nut to be tightened in the extension portion, and when the reaction force tool is attached to the joint portion, the abutment surface of the hydraulic torque wrench can be made to face the reaction force generating surface.

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