JP7850985B2 - Joint structure - Google Patents

Description

This invention relates to a joining structure.

For example, as disclosed in Patent Documents 1 and 2, reinforcing members such as braces are joined to existing structures made of steel pipe members via a joint structure to reinforce them. The joint structure needs to be designed to join the reinforcing members to the steel pipe members in such a way that relative movement between the steel pipe members and the reinforcing members is suppressed, so that the reinforcing members can resist or absorb forces acting on the steel pipe members.

As a component constituting such a joint structure, for example, Patent Document 1 discloses a pair of reinforcing member attachments that are joined to a steel pipe member by clamping it, and to which a brace is joined. The pair of reinforcing member attachments are joined to the steel pipe member by bolting their respective connecting flanges together and by adhesive bonding of their respective divided cylindrical bodies to the steel pipe member. The adhesive bonding the divided cylindrical bodies to the steel pipe member allows the pair of reinforcing member attachments to resist the longitudinal shear force on the steel pipe member from the brace, thereby suppressing relative movement between the steel pipe member and the brace.

Furthermore, Patent Document 2 discloses a pair of joining members that constitute a joint structure, which are fixed to clamp a steel pipe member and to which a brace is fixed. The pair of joining members are joined to the steel pipe member by bolts fixing their respective flanges to each other, and by through bolts that penetrate the steel pipe member at their respective clamping portions. The pair of joining members can resist the longitudinal shear force on the steel pipe member from the brace through the through bolts that fix the clamping portions to the steel pipe member, thereby suppressing relative movement between the steel pipe member and the brace.

Japanese Patent Publication No. 2009-102877 Japanese Patent Publication No. 2020-59968

However, as described in Patent Document 1, even when an adhesive is used to join a pair of reinforcing member attachments to a steel pipe member, the adhesive has significantly weak resistance to tensile force perpendicular to the longitudinal direction of the steel pipe member received from the brace. Therefore, when the steel pipe member receives tensile force perpendicular to the longitudinal direction from the brace, there is a possibility that the pair of reinforcing member attachments and the steel pipe member may detach, and the expected resistance to longitudinal shear force received from the brace cannot be maintained. Furthermore, as described in Patent Document 2, using through bolts to join a pair of connecting members to a steel pipe member requires creating bolt holes for the through bolts in the existing steel pipe member. Creating bolt holes at the construction site is a complicated process, and positioning the bolt holes is difficult. Moreover, creating the bolt holes reduces the strength of the steel pipe member. Additionally, changing the position of the connecting members after they have been positioned requires creating new bolt holes, which further complicates the work and leads to a further reduction in the strength of the steel pipe member.

This invention has been made in view of the above problems, and aims to provide a joining structure that allows reinforcing members to be firmly and easily joined to steel pipe members in existing structures.

The present invention provides a joining structure for joining a reinforcing member to a steel pipe member of an existing structure, comprising: a joining member joined to the steel pipe member so as to cover the outer circumference of the steel pipe member, to which the reinforcing member is joined; and a shear force resistance member joined to the steel pipe member so as to cover the outer circumference of the steel pipe member, wherein the shear force resistance member is arranged to directly or indirectly abut the joining member in the longitudinal direction of the steel pipe member.

Furthermore, it is preferable that the shear force resistance member is joined to the steel pipe member on both sides in the longitudinal direction, with the joining member in between.

Furthermore, it is preferable that the pair of shear force resistance members, which are joined to the steel pipe member on both sides of the longitudinal direction with the joining member in between, be connected to each other by connecting bolts extending in the longitudinal direction, so as to suppress their relative movement relative to each other in the direction that separates them in the longitudinal direction.

Furthermore, the shear force resistance member comprises at least two resistance clamping members that clamp the steel pipe member in a direction substantially perpendicular to the longitudinal direction of the steel pipe member and are fixed to each other, wherein the resistance clamping member comprises a partially cylindrical resistance clamping portion that directly or indirectly contacts the outer surface of the steel pipe member, and a resistance flange portion that extends radially outward from the circumferential end of the resistance clamping portion, wherein the resistance clamping portion of each of the at least two resistance clamping members directly or indirectly contacts the outer surface of the steel pipe member. Preferably, the resistance clamping members are positioned to contact the target, but before being fixed to each other, a gap is created between the opposing resistance flange portions of adjacent resistance clamping members in the circumferential direction of the steel pipe member. The at least two resistance clamping members are joined to the steel pipe member by clamping bolts extending in the direction in which the resistance flange portions face each other, thereby clamping the steel pipe member in a direction substantially perpendicular to the longitudinal direction and applying compressive force to the steel pipe member.

Furthermore, it is preferable that the shear force resistance member be joined to the steel pipe member via an adhesive.

Furthermore, the joining member comprises at least two joining clamping members that clamp the steel pipe member in a direction substantially perpendicular to the longitudinal direction of the steel pipe member and are fixed to each other. Each joining clamping member comprises a partially cylindrical joining clamping portion that directly or indirectly abuts the outer surface of the steel pipe member, and a joining flange portion extending radially outward from the circumferential end of the joining clamping portion. The at least two joining clamping members are joined to the steel pipe member by fixing the opposing joining flange portions of adjacent joining clamping members in the circumferential direction of the steel pipe member to each other by a fixing member extending in the direction in which the joining flange portions face each other. Preferably, the fixing member for the at least two joining clamping members is positioned radially adjacent to the steel pipe member such that the gap between the respective joining flange portions of adjacent joining clamping members in the circumferential direction of the steel pipe member is suppressed from widening due to the force received from the reinforcing member.

Furthermore, it is preferable that the connecting member be provided with a rib plate extending substantially perpendicular to the longitudinal direction and on the opposite side from the steel pipe member.

Furthermore, it is preferable that the surface roughness of the joint portion of the steel pipe member to which the shear force resistance member is joined is greater than the surface roughness of the joint portion of the steel pipe member to which the joining member is joined.

According to the present invention, a joining structure can be provided that allows for easy joining of reinforcing members to steel pipe members in existing structures.

This is a front view of a joint structure according to the first embodiment of the present invention. Figure 1 is a side view of the joint structure. This is a cross-sectional view of the joint structure shown in Figure 1, taken along the line III-III. Figure 1 is a cross-sectional view of the joint structure along the line IV-IV. Figure 1 is a cross-sectional view showing the state before and after joining the shear force resistance member and the steel pipe member in the joint structure, where (a) shows the state before joining and (b) shows the state after joining. Figure 1 is a front view of the joint structure, with the joint members and shear force resistance members shown by dashed lines. This is a front view of a joint structure according to a second embodiment of the present invention. Figure 7 is a cross-sectional view of the joint structure along line VIII-VIII. This is a front view of a joint structure according to a third embodiment of the present invention. Figure 9 is a side view of the joint structure. Figure 9 is a cross-sectional view of the joint structure along line XI-XI. Figure 9 is a cross-sectional view of the joint structure taken along line XII-XII. This is a front view of a joint structure according to a fourth embodiment of the present invention. Figure 13 is a perspective view of the joint structure. Figure 13 is a cross-sectional view of the joint structure along the line XV-XV.

The following describes four embodiments of the joint structure of the present invention with reference to the attached drawings. However, the embodiments shown below are merely examples, and the joint structure of the present invention is not limited to these examples. Figures 1 to 6 are diagrams related to the joint structure 1 according to the first embodiment, Figures 7 to 8 are diagrams related to the joint structure 1 according to the second embodiment, Figures 9 to 12 are diagrams related to the joint structure 1 according to the third embodiment, and Figures 13 to 15 are diagrams related to the joint structure 1 according to the fourth embodiment. In the following description, the configurations common to all embodiments will be described together, while different configurations for each embodiment will be added as appropriate. In the following description, "this embodiment" refers to all embodiments. In all figures, the same reference numerals are used for elements having a common function in the joint structure of each embodiment.

The joining structure 1 of this embodiment, as shown in Figures 1-2, 7, 9-10, and 13, is used to join reinforcing members BD and HS to steel pipe members SP of an existing structure. The existing structure to which the joining structure 1 is applied is not particularly limited, as long as at least a portion of it is composed of steel pipe members SP; for example, an existing steel pipe truss structure is an example. The steel pipe member SP to which the reinforcing members BD and HS are joined is not particularly limited, as long as it is a cylindrical member made of steel. Besides the cylindrical shape shown (see also Figures 3-4, 8, 11-12, and 14), it may also have other cylindrical shapes, such as a rectangular tube shape, and its constituent material may be carbon steel or stainless steel.

The reinforcing members BD and HS, joined to the steel pipe member SP by the joining structure 1, are members that reinforce the existing structure by being joined to the steel pipe member SP. The reinforcing members BD and HS absorb vibration energy generated in the steel pipe member SP when the existing structure is subjected to external disturbances such as seismic motion and wind, and/or resist external forces received from the steel pipe member SP, thereby suppressing deformation of the existing structure and improving its strength, thereby improving the seismic resistance and vibration damping of the existing structure. The reinforcing members BD and HS are not particularly limited as long as they can be joined to the steel pipe member SP and reinforce the existing structure. Examples include braces joined to the steel pipe member SP by the joining structure 1 of the first and second embodiments shown in Figures 1 and 7, and H-shaped steels joined to the steel pipe member SP by the joining structure 1 of the third and fourth embodiments shown in Figures 9 and 13.

The joint structure 1, as shown in Figures 1-2, 7, 9-10, and 13-14, comprises a joint member 2 that is joined to the steel pipe member SP so as to cover its outer circumference, and to which reinforcing members BD and HS are joined; and a shear force resistance member 3 that is joined to the steel pipe member SP so as to cover its outer circumference.

As shown in Figures 1, 7, 9, and 13, the joining member 2 is joined to the steel pipe member SP, and also joins the reinforcing members BD and HS to the steel pipe member SP. The joining member 2 is joined to the steel pipe member SP so as to cover its outer circumference, and engages with the steel pipe member SP in a direction perpendicular to the longitudinal direction LD of the steel pipe member SP, thereby suppressing relative movement of the steel pipe member SP in the direction perpendicular to the longitudinal direction LD. Furthermore, because the joining member 2 is joined to the steel pipe member SP so as to cover its outer circumference, the frictional force (and possibly adhesive force) generated between the joining member 2 and the steel pipe member SP suppresses relative movement of the steel pipe member SP in the longitudinal direction LD. As a result, the relative movement of the reinforcing members BD and HS joined to the joining member 2 is suppressed between them and the steel pipe member SP in the longitudinal direction LD and in the direction perpendicular to the longitudinal direction LD. Therefore, the loss of force transmission between them and the steel pipe member SP can be suppressed, and a reinforcing effect can be exerted on the existing structure. However, the joining member 2 only needs to engage with the steel pipe member SP in the direction perpendicular to the longitudinal direction LD of the steel pipe member SP, thereby suppressing its relative movement relative to the steel pipe member SP in the direction perpendicular to the longitudinal direction LD. As will be described in detail below, the relative movement of the steel pipe member SP in the longitudinal direction LD of the steel pipe member SP is suppressed by the shear force resistance member 3. Therefore, it is not necessarily required that the joining member 2 generate frictional force (and possibly adhesive force) between the joining member 2 and the steel pipe member SP to suppress the relative movement of the steel pipe member SP in the longitudinal direction LD.

In the first to third embodiments, as shown in Figures 3, 8, and 11, the joining member 2 is joined to the steel pipe member SP by directly contacting the surface of the outer circumference of the steel pipe member SP over substantially the entire circumference of the circumferential direction CD of the outer circumference of the steel pipe member SP, thereby covering substantially the entire circumference of the circumferential direction CD of the outer circumference of the steel pipe member SP. Because the joining member 2 covers substantially the entire circumference of the circumferential direction CD of the outer circumference of the steel pipe member SP and is joined to the steel pipe member SP, the engagement force between the joining member 2 and the steel pipe member SP in the direction perpendicular to the longitudinal direction LD becomes larger, and the frictional force between the joining member 2 and the steel pipe member SP also becomes larger. As a result, the relative movement between the joining member 2 and the steel pipe member SP in the longitudinal direction LD and in the direction perpendicular to the longitudinal direction LD is further suppressed, and consequently, the relative movement between the reinforcing members BD, HS and the steel pipe member SP is further suppressed. However, the joining member 2 is not limited to this embodiment as long as it covers the outer circumference of the steel pipe member SP and is joined to the steel pipe member SP in such a way that relative movement of the steel pipe member SP in the longitudinal direction LD and in the direction perpendicular to the longitudinal direction LD is suppressed. For example, it may be joined to the steel pipe member SP so as to cover a part of the circumferential direction CD of the outer circumference of the steel pipe member SP, or it may be joined to the steel pipe member SP by covering the outer circumference of the steel pipe member SP by indirectly contacting the surface of the steel pipe member SP via another material such as a rubber material that increases frictional force. In the fourth embodiment, as shown in Figures 13 to 15, the joining member 2 is joined to the steel pipe member SP so as to cover the entire circumference of the circumferential direction CD of the outer circumference of the steel pipe member SP, with the joining flange portion 21d (described later) directly contacting the surface of the outer circumference of the steel pipe member SP, and the joining clamping portion 21a (described later) indirectly contacting the surface of the outer circumference of the steel pipe member SP via the filler material 25. However, even in the fourth embodiment, the joining member 2 may be joined to the steel pipe member SP such that it covers a portion of the circumferential CD on the outer circumference of the steel pipe member SP.

The joining member 2 only needs to be joined to the steel pipe member SP so as to partially cover the outer circumference of the steel pipe member SP, in order to suppress relative movement of the steel pipe member SP in the longitudinal direction LD and in the direction perpendicular to the longitudinal direction LD, and its configuration is not particularly limited. In this embodiment, as shown in Figures 1-3, 7-8, 9-11 and 13-14, the joining member 2 includes a pair of joining clamping members 21, 21 that clamp the steel pipe member SP in a direction substantially perpendicular to the longitudinal direction LD of the steel pipe member SP (clamping direction SD1 in this embodiment) and are fixed to each other. The pair of joining clamping members 21, 21 are fixed to each other while the steel pipe member SP is clamped in the clamping direction SD1, thereby joining the steel pipe member SP so as to cover substantially the entire circumference of the circumferential direction CD of the outer circumference of the steel pipe member SP. The pair of joining clamping members 21, 21 cover almost the entire circumference of the circumferential direction CD of the outer circumference of the steel pipe member SP, thereby increasing the engagement force between the pair of joining clamping members 21, 21 and the steel pipe member SP in the direction perpendicular to the longitudinal direction LD, and also increasing the frictional force (and possibly adhesive force) between the pair of joining clamping members 21, 21 and the outer surface of the steel pipe member SP. This further suppresses the relative movement of the pair of joining clamping members 21, 21 with respect to the steel pipe member SP in the longitudinal direction LD and in the direction perpendicular to the longitudinal direction LD. In this embodiment, the joining member 2 comprises a pair (two) of joining clamping members 21, 21. However, as long as at least two joining clamping members are provided to clamp the steel pipe member SP in a direction substantially perpendicular to the longitudinal direction LD, not limited to the clamping direction SD1, the joining member 2 may also comprise three or more joining clamping members arranged side-by-side along the circumferential direction CD of the steel pipe member SP.

The joining and clamping member 21 is not particularly limited in its constituent material, as long as it supports at least the reinforcing members BD and HS and has sufficient strength to suppress deformation caused by forces from the steel pipe member SP and the reinforcing members BD and HS. For example, it can be formed from a known steel plate.

In this embodiment, the joining clamping member 21, as shown in Figures 1-3, 7-8, 9-11, and 13-15, comprises a partially cylindrical joining clamping portion 21a that directly or indirectly contacts the outer surface of the steel pipe member SP, and a joining flange portion 21b that extends radially outward from the end of the joining clamping portion 21a in the circumferential direction CD. At least two (a pair in this embodiment) joining clamping members 21, 21 are joined to the steel pipe member SP by fixing the opposing joining flange portions 21b, 21b of adjacent joining clamping members 21, 21 in the circumferential direction CD of the steel pipe member SP to each other by fixing members (clamping bolts 22 and/or connecting members 24, described later) that extend in the direction in which the joining flange portions 21b, 21b face each other. In the fourth embodiment, the joining clamping member 21 is further provided with joining flanges 21d that extend substantially perpendicular to the longitudinal direction LD from the inside to the outside of the radial direction of the joining clamping member 21a, over substantially the entire circumferential direction CD of the joining clamping member 21a, on both sides of the joining clamping member 21a in the longitudinal direction LD. When the joining clamping member 21 is joined to the steel pipe member SP, the joining flanges 21d come into contact with the outer surface of the steel pipe member SP, and a space is formed in which the filler material 25 is filled in the area surrounded by the joining clamping member 21a, the joining flanges 21d, and the outer surface of the steel pipe member SP (see Figure 15). The filler material 25 is not particularly limited as long as it is a material that can deform to follow the shape of the surrounding space when placed in the above-mentioned space and hardens after placement, and known grouts and adhesives can be used, and grout can be suitably used from the viewpoint of cost. The filler material 25 is injected through the injection hole H provided in the joining clamping portion 21a after the joining clamping member 21 is attached to the steel pipe member SP.

The joining clamping portion 21a is a portion that directly or indirectly contacts the outer surface of the steel pipe member SP and covers a part of the circumferential direction CD of the outer surface of the steel pipe member SP. By directly or indirectly contacting the outer surface of the steel pipe member SP, the joining clamping portion 21a generates an engagement force with the steel pipe member SP in a direction perpendicular to the longitudinal direction LD of the steel pipe member SP, and also generates a frictional force with the outer surface of the steel pipe member SP. In the first to third embodiments, the joining clamping portion 21a is arranged to directly contact the outer surface of the steel pipe member SP, as shown in Figures 3, 8, and 11. However, the joining clamping portion 21a is not limited to the illustrated examples, as long as it contacts the outer surface of the steel pipe member SP in such a way that an engagement force is generated with the steel pipe member SP in a direction perpendicular to the longitudinal direction LD and a frictional force is generated with the outer surface of the steel pipe member SP. It may also be arranged to indirectly contact the steel pipe member SP via another material, such as a rubber material that increases the frictional force. Furthermore, in the fourth embodiment, the joining clamping portion 21a indirectly contacts the outer surface of the steel pipe member SP via the filler material 25, as shown in Figure 15. By interposing the filler material 25 between the joining clamping portion 21a and the outer surface of the steel pipe member SP, even if there are irregularities on the outer surface of the steel pipe member SP, the formation of a gap between the joining clamping portion 21a and the outer surface of the steel pipe member SP is suppressed. As a result, the joining clamping portion 21a more reliably engages with the steel pipe member SP in a direction perpendicular to the longitudinal direction LD of the steel pipe member SP, thereby suppressing relative movement of the steel pipe member SP in the direction perpendicular to the longitudinal direction LD.

The joining clamping portion 21a only needs to be able to directly or indirectly contact the outer surface of the steel pipe member SP, and its shape and size are not particularly limited. For example, in the first to third embodiments, the joining clamping portion 21a is formed to have a shape and size corresponding to the shape and size of the outer surface of the steel pipe member SP. More specifically, as shown in Figures 1 to 3, 7 to 8, and 9 to 11, the joining clamping portion 21a is formed in a substantially half-cylindrical shape to correspond to the outer shape of the substantially cylindrical steel pipe member SP, and the inner diameter of the joining clamping portion 21a is formed to be substantially the same as the outer diameter of the steel pipe member SP, or slightly larger than the outer diameter of the steel pipe member SP, corresponding to the size of the outer circumference of the steel pipe member SP. For example, in the fourth embodiment, as shown in Figures 13 to 15, the joining clamping portion 21a is formed in a substantially half-cylindrical shape to correspond to the shape of the outer circumference of the substantially cylindrical steel pipe member SP, and the inner diameter of the joining clamping portion 21a is formed to be larger than the outer diameter of the steel pipe member SP so that the filler material 25 can be filled between the joining clamping portion 21a and the outer surface of the steel pipe member SP. In the fourth embodiment, the joining clamping portion 21a only needs to have an inner diameter larger than the outer diameter of the steel pipe member SP so that the filler material 25 can be filled, and is not particularly limited, but it is preferable that it has substantially the same diameter as the resistance clamping portion 31a of the shear force resistance member 3, which will be described later, and is formed and arranged so that they are aligned substantially in the same straight line in a cross section along the longitudinal direction LD (see Figure 15). As a result, when force is transmitted from the joining member 2 to the shear force resistance member 3, the deformation of the joining member 2 and the shear force resistance member 3 is suppressed, and the resistance force by the shear force resistance member 3, which will be described later, can be increased. In this embodiment, the joining clamping portion 21a is formed in a substantially half-cylindrical shape. However, if the steel pipe member SP is formed in a cylindrical shape other than substantially cylindrical, it may be formed in a substantially half-cylindrical shape corresponding to the shape of the outer circumference of the steel pipe member SP. Furthermore, the joining clamping portion 21a is not limited to a substantially half-cylindrical shape, as long as it can cover a portion of the circumferential direction CD of the outer surface of the steel pipe member SP; it may be formed in a partially cylindrical shape such as a 1/3 or 2/3 cylinder. Also, the joining clamping portion 21a may be formed to a size such that a gap is created between the joining clamping portions 21a, 21a when the steel pipe member SP is clamped in the clamping direction SD1 together with the other joining clamping portion 21a.

The joining flange portion 21b is fixed to the joining flange portion 21b of another adjacent joining clamping member 21 in the circumferential direction CD of the steel pipe member SP, thereby fixing adjacent joining clamping members 21, 21 in the circumferential direction CD of the steel pipe member SP. In this embodiment, as shown in Figures 1, 3, 7, 8, 9, 11, and 13, 14, the joining flange portion 21b is formed in a plate shape so as to extend radially outward from both ends of the joining clamping portion 21a in the circumferential direction CD, along a direction substantially perpendicular to both the longitudinal direction LD and the clamping direction SD1. Note that as long as the joining flange portion 21b is formed to extend radially outward from the end of the joining clamping portion 21a in the circumferential direction CD, its direction of extension is not limited to a direction substantially perpendicular to both the longitudinal direction LD and the clamping direction SD1, and can be appropriately modified according to the arrangement of the joining flange portion 21b of the other joining clamping member 21 to be fixed.

Here, the reinforcing members BD and HS, which are joined to the joining member 2, only need to be joined to the joining member 2 in a way that reinforces the existing structure; the position and method of joining are not particularly limited. In this embodiment, the reinforcing members BD and HS are joined to the joining flange portion 21b of the joining clamping member 21, as shown in Figures 1-3, 7, 8, 9, 11, and 13.

In the joint structure 1 of the first and second embodiments, in which the reinforcing member brace BD is joined to the joint member 2, as shown in Figures 3 and 8, the brace BD is joined to the joint member 2 by fixing means such as bolts while a plate-shaped connecting member CM1 fixed to the brace BD is sandwiched between adjacent joint flange portions 21b, 21b. In the first and second embodiments, as shown in Figures 1 and 7, four brace BDs are joined to the joint member 2, and each brace BD is arranged to extend in a direction inclined with respect to the longitudinal direction LD (in the first and second embodiments, in a direction inclined at 45°). One end of each brace BD is joined to the joining flange portions 21b, 21b on both sides (left and right sides in Figures 1 and 7) of the joining clamping portion 21a, perpendicular to both the longitudinal direction LD and the clamping direction SD1 (left and right directions in Figures 1 and 7), adjacent to the ends of the joining flange portions 21b on both sides (up and down sides in Figures 1 and 7) of the longitudinal direction LD. The other end of each brace BD is joined to another member of the existing structure (steel pipe member SP, etc.) via another joining structure (joining structure 1, etc.). However, the number and arrangement of brace BDs can be appropriately modified according to the structure of the existing structure to be reinforced. Furthermore, the brace BD may be joined to other locations on the joining flange portion 21b, or to other locations on the joining member 2 other than the joining flange portion 21b.

In the third and fourth embodiments of the joining structure 1, in which the reinforcing member H-shaped steel HS is joined to the joining member 2, as shown in Figures 9, 11, and 13, the web portion of the connecting member CM2, which has a substantially T-shaped cross-section and whose flange portion is fixed to the flange portion of the H-shaped steel HS by welding or the like, is sandwiched between adjacent joining flange portions 21b, 21b and fixed by fixing means such as bolts, thereby joining the H-shaped steel HS to the joining member 2. In the third and fourth embodiments, the H-shaped steel HS is arranged along the longitudinal direction LD so as to extend substantially parallel to the steel pipe member SP, and the flange portion of the H-shaped steel HS is joined via the connecting member CM2 to one side (right side in Figures 9 and 11) of the joining clamping portion 21a perpendicular to both the longitudinal direction LD and the clamping direction SD1 (left and right direction in Figures 9 and 11) of the joining flange portion 21b. However, the arrangement of the H-shaped steel HS can be appropriately modified according to the structure of the existing structure to be reinforced. Furthermore, the H-shaped steel beam HS may be joined to other locations on the joining flange portion 21b, or to other locations on the joining member 2 other than the joining flange portion 21b.

As described above, at least two (a pair in this embodiment) joining clamping members 21, 21 are fixed to each other by fixing members (clamping bolts 22 and/or connecting members 24) that extend in the direction in which the adjacent joining flange portions 21b, 21b face each other. It is preferable that the fixing members (clamping bolts 22 and/or connecting members 24) for at least two (a pair in this embodiment) joining clamping members 21, 21 are arranged radially adjacent to the steel pipe member SP, as shown in Figures 1, 3, 7, 8, 9, 11 and 13, 14, such that the gap between the respective joining flange portions 21b, 21b of the joining clamping members 21, 21 adjacent to each other in the circumferential direction CD of the steel pipe member SP is suppressed from widening (in the vertical direction in Figures 3, 8, 11, and 14) due to the force received from the reinforcing members BD, HS. When the joining clamping members 21, 21 are subjected to tensile force from the reinforcing members BD, HS in a direction perpendicular to the longitudinal direction LD (left-right direction in Figures 3 and 8, and rightward direction in Figures 11 and 13), the partially cylindrical joining clamping portions 21a, 21a are subjected to stress that tends to deform them into a flat plate shape, and the joint flange portions 21b, 21b, which are fixed to each other, are subjected to stress that tends to separate them from each other (up and down direction in Figures 3, 8, 11, and 14). If the gap between the joint flange portions 21b, 21b widens due to such stress, a gap may be created between the joining clamping portions 21a, 21a (and the joint flange portions 21d, 21d) and the outer surface of the steel pipe member SP. In this embodiment, the joining flange portions 21b, 21b are fixed to each other by fixing members (clamping bolts 22 and/or connecting members 24) arranged radially adjacent to the steel pipe member SP. This suppresses the widening of the gap between the joining flange portions 21b, 21b, and prevents the formation of gaps between the joining clamping portions 21a, 21a (and joining flange portions 21d, 21d) and the outer surface of the steel pipe member SP. This suppresses a decrease in the engagement force between the joining clamping portions 21a, 21a (and joining flange portions 21d, 21d) and the steel pipe member SP in the direction perpendicular to the longitudinal direction LD of the steel pipe member SP, and also suppresses a decrease in the frictional force (and possibly adhesive force) between the joining clamping portions 21a, 21a (and joining flange portions 21d, 21d) and the outer surface of the steel pipe member SP.

The fixing members (clamping bolts 22 and/or connecting members 24) only need to be positioned adjacent to the steel pipe member SP in the radial direction of the steel pipe member SP, and are not particularly limited. However, the end of the fixing member on the steel pipe member SP side is preferably positioned within a length of 1/10 or less of the radial length of the steel pipe member SP from the radial end of the steel pipe member SP, more preferably within a length of 1/20 or less of the radial length of the steel pipe member SP from the radial end of the steel pipe member SP, and even more preferably in contact with the joining clamping portion 21a, while being positioned adjacent to the steel pipe member SP.

As a fixing member, for example, a clamping bolt 22 extending in a direction in which the joining flange portions 21b, 21b face each other can be used, as in the joining structures 1 of the first, third, and fourth embodiments shown in Figures 1-3, 9-11, and 13-14. The clamping bolt 22 extends in a direction in which the joining flange portions 21b, 21b face each other, penetrates the joining flange portions 21b, 21b, and fixes the joining flange portions 21b, 21b to each other. In the joining structures 1 of the first, third, and fourth embodiments, the clamping bolt 22 is fixed to the joining flange portion 21b via a clamping washer 23 placed on the surface of the joining flange portion 21b, as shown in Figures 1-3, 9-11, and 13-14. By fixing the clamping bolt 22 to the joint flange portion 21b via the clamping washer 23, the area over which the clamping force of the clamping bolt 22 acts can be extended to the area of the clamping washer 23, further suppressing the widening of the gap between the joint flange portions 21b, 21b.

The clamping bolt 22 does not need to be positioned adjacent to the steel pipe member SP in the radial direction of the steel pipe member SP, and is not particularly limited. However, the axis of the clamping bolt 22 is preferably positioned adjacent to the steel pipe member SP such that it is located within a range of 1/2 or less of the radial length of the steel pipe member SP from the radial end of the steel pipe member SP, and more preferably within a range of 1/3 or less of the radial length of the steel pipe member SP from the radial end of the steel pipe member SP. Furthermore, the clamping washer 23 is appropriately positioned according to the location where the clamping bolt 22 is placed. Preferably, the end of the clamping washer 23 on the steel pipe member SP side is positioned within a length of 1/10 or less of the radial length of the steel pipe member SP from its radial end, more preferably within a length of 1/20 or less of the radial length of the steel pipe member SP from its radial end, and even more preferably adjacent to the steel pipe member SP so as to contact the joining clamping portion 21a. In this specification, the clamping bolt 22 is shown as being provided on the joining member 2 in the first, third, and fourth embodiments, but it may also be provided on the joining member 2 in the second embodiment, similar to the joining member 2 in the first, third, and fourth embodiments.

Furthermore, as a fixing member, a connecting member 24 (such as a washer) extending in a direction opposite to the joining flange portions 21b, 21b can also be used, for example, as in the joining structure 1 of the second embodiment shown in Figures 7 and 8. As shown in Figures 7 and 8, the connecting member 24 extends in a direction opposite to the joining flange portions 21b, 21b, penetrates the joining flange portions 21b, 21b, and connects the rib plates 21c, which will be described later and provided on the joining flange portions 21b, 21b, to each other, thereby fixing the joining flange portions 21b, 21b to each other. As shown in Figure 7, the connecting member 24 is arranged on both sides of the longitudinal LD of the rib plate 21c so as to sandwich the rib plate 21c in the longitudinal LD. As shown in Figure 8, one end of the connecting member 24 in its extending direction (the upper end in Figure 8) is fixed to a rib plate 21c provided on one (upper) joining flange portion 21b by fastening means such as bolts, and the other end of the connecting member 24 in its extending direction (the lower end in Figure 8) is fixed to a rib plate 21c provided on the other (lower) joining flange portion 21b by fastening means such as bolts.

The connecting member 24 is not particularly limited, but it is sufficient that it is positioned adjacent to the steel pipe member SP in the radial direction of the steel pipe member SP. However, it is preferable that the end of the connecting member 24 on the steel pipe member SP side is located within a length of 1/10 or less of the radial length of the steel pipe member SP from the radial end of the steel pipe member SP, more preferably within a length of 1/20 or less of the radial length of the steel pipe member SP from the radial end of the steel pipe member SP, and even more preferably in contact with the joining clamping portion 21a. In this specification, the connecting member 24 is shown as being provided on the joining member 2 in the second embodiment, but it may also be provided on the joining member 2 in the first, third, and fourth embodiments, similar to the joining member 2 in the second embodiment.

The joining member 2 may be provided with a rib plate 21c that extends substantially perpendicular to the longitudinal direction LD and on the opposite side from the steel pipe member SP, as shown in the joining structure 1 of the first to third embodiments in Figures 1 to 3, 7, 8, and 9 to 11. By providing the joining member 2 with a rib plate 21c that extends substantially perpendicular to the longitudinal direction LD, deformation in the direction in which the rib plate 21c extends is suppressed, and the joining strength to the steel pipe member SP can be increased. In the first to third embodiments, the rib plate 21c is provided as part of the joining clamping member 21 and extends substantially perpendicular to the longitudinal direction LD from the surface of the joining clamping portion 21a and the joining flange portion 21b. As a result, when the joining clamping members 21, 21 are subjected to a tensile force perpendicular to the longitudinal direction LD from the reinforcing members BD, HS, deformation of the joining clamping portion 21a is suppressed, and the widening of the gap between the fixed joining flange portions 21b, 21b is suppressed, thereby suppressing the occurrence of a gap between the joining clamping portions 21a, 21a (and joining flange portions 21d, 21d) and the outer surface of the steel pipe member SP. This suppresses a decrease in the engagement force between the joining member 2 and the steel pipe member SP in the direction perpendicular to the longitudinal direction LD of the steel pipe member SP, thereby suppressing the relative movement of the joining member 2 with respect to the steel pipe member SP in the direction perpendicular to the longitudinal direction LD. In addition, a decrease in the frictional force (and possibly adhesive force) between the joining member 2 and the outer surface of the steel pipe member SP is suppressed, thereby suppressing the relative movement of the joining member 2 with respect to the steel pipe member SP in the longitudinal direction LD. In the fourth embodiment, as shown in Figures 13 to 15, a joining flange 21d is provided on the joining clamping member 21 of the joining member 2, and this joining flange 21d has the same function as the rib plate 21c described above. However, the joining member 2 in the fourth embodiment may also be provided with the rib plate 21c described above, similar to the joining member 2 in the joining structure 1 of the first to third embodiments.

As shown in Figures 1, 2, 7, 9, 10, and 13-15, the shear force resistance member 3 is positioned to abut against the joining member 2 in the longitudinal direction LD of the steel pipe member SP and is joined to the steel pipe member SP so as to cover its outer circumference. By joining the shear force resistance member 3 to the steel pipe member SP so as to cover its outer circumference, the frictional force and/or adhesive force generated between the shear force resistance member 3 and the steel pipe member SP suppresses the relative movement of the shear force resistance member 3 relative to the steel pipe member SP in the longitudinal direction LD. The shear force resistance member 3, whose relative movement in the longitudinal direction LD is suppressed, is positioned to abut against the joining member 2 in the longitudinal direction LD, thereby resisting the shear force in the longitudinal direction LD received from the joining member 2 and suppressing the relative movement of the joining member 2 relative to the steel pipe member SP in the longitudinal direction LD. In this embodiment, the shear force resistance member 3 is positioned to directly contact the joining member 2 in the longitudinal direction LD of the steel pipe member SP. However, as long as the relative movement of the joining member 2 with respect to the steel pipe member SP in the longitudinal direction LD can be suppressed, the configuration is not limited to this embodiment, and the member 3 may be positioned to indirectly contact the joining member 2 via another member.

In the first to third embodiments, as shown in Figures 4 and 12, the shear force resistance member 3 is joined to the steel pipe member SP by directly contacting the surface of the steel pipe member SP over substantially the entire circumference of the circumferential direction CD of the outer circumference of the steel pipe member SP, thereby covering substantially the entire circumference of the circumferential direction CD of the outer circumference of the steel pipe member SP. By joining the steel pipe member SP to the steel pipe member SP while covering substantially the entire circumference of the circumferential direction CD of the outer circumference of the steel pipe member SP, the frictional force between the shear force resistance member 3 and the steel pipe member SP becomes larger, and the relative movement between the shear force resistance member 3 and the steel pipe member SP in the longitudinal direction LD is further suppressed. However, the shear force resistance member 3 is not limited to this embodiment, as long as it covers the outer circumference of the steel pipe member SP and is joined to the steel pipe member SP in such a way that relative movement of the steel pipe member SP in the longitudinal direction LD is suppressed. For example, it may be joined to the steel pipe member SP so as to cover a part of the circumferential direction CD of the outer circumference of the steel pipe member SP, or it may be joined to the steel pipe member SP by indirectly contacting the surface of the steel pipe member SP via another material such as a rubber material that increases friction. Furthermore, in the fourth embodiment, as shown in Figures 13 to 15, the shear force resistance member 3 is joined to the steel pipe member SP so as to cover substantially the entire circumference of the circumferential direction CD of the outer circumference of the steel pipe member SP, with the resistance flange portion 31d (described later) directly or indirectly contacting the surface of the outer circumference of the steel pipe member SP, and the resistance clamping portion 31a (described later) indirectly contacting the surface of the steel pipe member SP via an adhesive 34. By joining the shear force resistance member 3 to the steel pipe member SP, covering substantially the entire circumference of the circumferential direction CD on the outer circumference of the steel pipe member SP, the frictional force and/or adhesive force between the shear force resistance member 3 and the steel pipe member SP is increased, and the relative movement between the shear force resistance member 3 and the steel pipe member SP in the longitudinal direction LD is further suppressed. However, in the fourth embodiment as well, the shear force resistance member 3 may be joined to the steel pipe member SP so as to cover a portion of the circumferential direction CD on the outer circumference of the steel pipe member SP. Also, in the first to third embodiments, the shear force resistance member 3 may be joined to the steel pipe member SP via the adhesive 34.

Even when the joining member 2 is subjected to tensile force along the longitudinal direction LD from the reinforcing members BD and HS, its relative movement relative to the steel pipe member SP in the longitudinal direction LD is suppressed by the frictional force (and possibly adhesive force) between the joining member 2 and the steel pipe member SP, as well as the frictional force between the shear force resistance member 3 and the steel pipe member SP and/or the adhesive force between the shear force resistance member 3 and the steel pipe member SP. Furthermore, even if the joining member 2 is subjected to tensile force perpendicular to the longitudinal direction LD from the reinforcing members BD and HS as described above, and the frictional force (and possibly adhesive force) between the joining member 2 and the steel pipe member SP decreases, its relative movement relative to the steel pipe member SP in the longitudinal direction LD is suppressed by the frictional force between the shear force resistance member 3 and the steel pipe member SP, to which the reinforcing members BD and HS are not joined, and/or the adhesive force between the shear force resistance member 3 and the steel pipe member SP. In other words, even if sufficient frictional force (and possibly adhesive force) does not exist between the joining member 2 and the steel pipe member SP, the frictional force between the shear force resistance member 3 and the steel pipe member SP, and/or the adhesive force between the shear force resistance member 3 and the steel pipe member SP, suppress the relative movement of the joining member 2 with respect to the steel pipe member SP in the longitudinal direction LD. As a result, the relative movement of the reinforcing members BD and HS joined to the joining member 2 with respect to the steel pipe member SP in the longitudinal direction LD is suppressed, thereby reducing the loss of force transmission between them and the steel pipe member SP, and allowing them to provide a reinforcing effect on the existing structure.

According to the joining structure 1 of this embodiment, as described above, by arranging the shear force resistance member 3 separately from the joining member 2 to which the reinforcing members BD and HS are joined, so as to abut the joining member 2 in the longitudinal direction LD of the steel pipe member SP, the reinforcing members BD and HS can be firmly joined to the steel pipe member SP. Furthermore, since there is no need to use through bolts as in the conventional technology, the reinforcing members BD and HS can be easily joined to the steel pipe member SP in existing structures.

In this embodiment, the shear force resistance members 3, 3 are joined to the steel pipe member SP on both sides of the longitudinal LD, sandwiching the joining member 2, as shown in Figures 1, 2, 7, 9, 10, and 13, 14. By providing the shear force resistance members 3, 3 on both sides of the longitudinal LD, sandwiching the joining member 2, relative movement of the joining member 2 to both sides of the longitudinal LD is suppressed. For example, in the joining structure 1 of the first and second embodiments shown in Figures 1, 2, and 7, two braces BD are joined to each side of the longitudinal LD of the joining member 2. When the joining member 2 receives tensile force from the two braces BD on one side of the longitudinal LD (the upper side in Figures 1, 2, and 7), it receives tensile force toward one side of the longitudinal LD, but relative movement toward one side of the longitudinal LD is suppressed by the shear force resistance members 3 positioned on one side of the longitudinal LD. Furthermore, when the joining member 2 receives tensile force from the two braces BD on the other side of the longitudinal LD (the lower side in Figures 1, 2, and 7), it receives tensile force toward the other side of the longitudinal LD. However, the relative movement of the longitudinal LD toward the other side is suppressed by the shear force resistance member 3 positioned on the other side of the longitudinal LD. Similarly, in the joining structure 1 of the third and fourth embodiments shown in Figures 9, 10, and 13, 14, the relative movement of the joining member 2 toward both sides of the longitudinal LD is suppressed by the shear force resistance members 3, 3 provided on both sides of the longitudinal LD. However, the shear force resistance member 3 may be joined to the steel pipe member SP on either side of the longitudinal LD where suppression of relative movement of the joining member 2 is necessary, depending on the arrangement of the reinforcing members BD and HS.

The pair of shear force resistance members 3, 3, which are joined to the steel pipe member SP on both sides of the longitudinal direction LD with the joining member 2 in between, are preferably connected to each other by connecting bolts 33 extending in the longitudinal direction LD, as shown in the joining structure 1 of the first to third embodiments in Figures 1, 2, 7 and 9, 10, so as to suppress relative movement of each other in the direction of separation in the longitudinal direction LD. In the first to third embodiments, the pair of shear force resistance members 3, 3 are connected to each other by connecting bolts 33, which connect the rib plates 31c, 31c of the resistance clamping members 31, 31, described later, of the pair of shear force resistance members 3, 3. In the first to third embodiments, the connecting bolt 33 connects one rib plate 31c, 31c of each of the shear resistance members 3, 3 on both sides. However, it may also pass through multiple rib plates 31c, 31c of each of the shear resistance members 3, 3 on both sides to connect multiple rib plates 31c, 31c together. In addition, in the first to third embodiments, the connecting bolt 33 is fixed by two nuts provided on the outside of the longitudinal LD of the opposing rib plates 31c, 31c. However, it may also be fixed by nuts provided on either side of each rib plate 31c by sandwiching it with the longitudinal LD. Furthermore, in the first to third embodiments, the connecting bolt 33 directly connects the shear resistance members 3, 3 on both sides. However, it may also be used as a high-tension bolt to connect the rib plates 31c, 31c of each of the shear resistance members 3, 3 on both sides to the rib plates 21c, 21c of the joining member 2, thereby indirectly connecting the shear resistance members 3, 3 on both sides via the joining member 2. Furthermore, the pair of shear force resistance members 3, 3 only need to be connected to each other in such a way that relative movement between them in the longitudinal direction LD is suppressed, and they may be connected to each other via parts other than the rib plates 31c, 31c. Note that in the fourth embodiment of the joint structure 1, the connecting bolts 33 described above are not provided, but similar to the joint structures 1 of the first to third embodiments, connecting bolts 33 for connecting the pair of shear force resistance members 3, 3 may be provided. In that case, the above-described configuration in relation to the connecting bolts 33 also applies to the fourth embodiment of the joint structure 1.

The pair of shear force resistance members 3, 3 have their relative movement in the direction of separation from each other in the longitudinal LD suppressed, thereby further suppressing the relative movement of the joining member 2 with respect to the steel pipe member SP in the longitudinal LD. Specifically, referring to the joining structure 1 of the first embodiment shown in Figures 1 and 2, when the joining member 2 receives a tensile force toward one side of the longitudinal LD from, for example, two braces BD on one side of the longitudinal LD (upper side in Figures 1 and 2), it transmits the shear force toward one side of the longitudinal LD to the shear force resistance member 3 located on one side of the longitudinal LD. The shear force resistance member 3 on one side transmits the shear force received from the joining member 2 to the other shear force resistance member 3 located on the other side of the longitudinal LD (lower side in Figures 1 and 2), which is connected to the other side of the longitudinal LD. As a result, the shear force received from the joining member 2 can be resisted by both the pair of shear force resistance members 3, 3 provided on both sides of the longitudinal LD, thereby further suppressing the relative movement of the joining member 2 with respect to the steel pipe member SP in the longitudinal LD. Similarly, when the joining member 2 receives tensile force from the two braces BD on the other side of the longitudinal LD (lower side in Figures 1 and 2) toward the other side of the longitudinal LD, both the pair of shear force resistance members 3, 3 provided on both sides of the longitudinal LD can resist the shear force received from the joining member 2. The same applies to the joining structure 1 of the second and third embodiments shown in Figures 7, 9, and 10, and also to the case where the joining structure 1 of the fourth embodiment is provided with connecting bolts 33.

The shear force resistance member 3 only needs to be joined to the steel pipe member SP so as to partially cover the outer circumference of the steel pipe member SP, so that relative movement of the steel pipe member SP in the longitudinal direction LD is suppressed, and its configuration is not particularly limited. In the first to third embodiments, as shown in Figures 1, 2, 4, 7 and 9, 10, 12, the shear force resistance member 3 includes a pair of resistance clamping members 31, 31 that clamp the steel pipe member SP in a direction substantially perpendicular to the longitudinal direction LD of the steel pipe member SP (clamping direction SD2 in this embodiment) and are fixed to each other. The pair of resistance clamping members 31, 31 are fixed to each other while clamping the steel pipe member SP in the clamping direction SD2, thereby joining the steel pipe member SP so as to cover substantially the entire circumference of the outer circumference CD of the steel pipe member SP. The pair of resistance clamping members 31, 31 cover almost the entire circumference of the circumferential direction CD on the outer circumference of the steel pipe member SP, thereby increasing the frictional force between the pair of resistance clamping members 31, 31 and the outer surface of the steel pipe member SP, and further suppressing the relative movement of the pair of resistance clamping members 31, 31 with respect to the steel pipe member SP in the longitudinal direction LD. In the fourth embodiment, as shown in Figures 14 and 15, the shear force resistance member 3 includes a pair of resistance clamping members 31, 31 that clamp the steel pipe member SP in a direction substantially perpendicular to the longitudinal direction LD of the steel pipe member SP (clamping direction SD2 in this embodiment) and are fixed to the steel pipe member SP. The pair of resistance clamping members 31, 31 are fixed to the steel pipe member SP via adhesive 34 while the steel pipe member SP is clamped in the clamping direction SD2, thereby joining them to the steel pipe member SP so as to cover almost the entire circumference of the circumferential direction CD on the outer circumference of the steel pipe member SP. The pair of resistance clamping members 31, 31 cover almost the entire circumference of the circumferential direction CD of the outer circumference of the steel pipe member SP, thereby increasing the frictional and/or adhesive force between the pair of resistance clamping members 31, 31 and the outer surface of the steel pipe member SP, and further suppressing the relative movement of the pair of resistance clamping members 31, 31 with respect to the steel pipe member SP in the longitudinal direction LD. In the fourth embodiment, the pair of resistance clamping members 31, 31 are fixed to each other via a joining plate 35 as shown in Figure 14, but they do not necessarily have to be fixed to each other as long as they are joined to the steel pipe member SP via adhesive 34. In this embodiment, the shear force resistance member 3 comprises a pair (two) of resistance clamping members 31, 31, but is not limited to this embodiment as long as at least two resistance clamping members are provided to clamp the steel pipe member SP in a direction substantially perpendicular to the longitudinal direction LD, not limited to the clamping direction SD2, for example, there may be three or more resistance clamping members arranged in a line along the circumferential direction CD of the steel pipe member SP. Furthermore, the clamping direction SD2 of the pair of resistance clamping members 31, 31 is substantially parallel to the clamping direction SD1 of the pair of joining clamping members 21, 21 in the first, second, and fourth embodiments, and substantially perpendicular to the clamping direction SD1 of the pair of joining clamping members 21, 21 in the third embodiment. However, this is not particularly limited, and can be appropriately modified depending on the arrangement of adjacent members.

The resistive clamping member 31 is not particularly limited in its constituent material, as long as it has sufficient strength to suppress deformation caused by the shear force received from the joining member 2. For example, it can be formed from a known steel plate.

In the first to third embodiments, the resistance clamping member 31, as shown in Figures 1, 2, 4, 7, and 9, 10, 12, comprises a partially cylindrical resistance clamping portion 31a that directly or indirectly contacts the outer surface of the steel pipe member SP, and a resistance flange portion 31b that extends radially outward from the end of the resistance clamping portion 31a in the circumferential direction CD. At least two (a pair in the first to third embodiments) resistance clamping members 31, 31 are joined to the steel pipe member SP by fixing the opposing resistance flange portions 31b, 31b of adjacent resistance clamping members 31, 31 in the circumferential direction CD of the steel pipe member SP to each other by clamping bolts 32 that extend in the direction in which the resistance flange portions 31b, 31b face each other. Furthermore, in the fourth embodiment, as shown in Figures 13 to 15, the resistance clamping member 31 includes a partially cylindrical resistance clamping portion 31a that indirectly contacts the outer surface of the steel pipe member SP, and a resistance flange portion 31d that extends substantially perpendicular to the longitudinal direction LD from the inside to the outside of the resistance clamping portion 31a, over substantially the entire circumferential direction CD of the resistance clamping portion 31a, on both sides of the resistance clamping portion 31a in the longitudinal direction LD. When the resistance clamping member 31 is joined to the steel pipe member SP, the resistance flange portion 31d contacts the outer surface of the steel pipe member SP, and a space is formed in which adhesive 34 is filled in the region surrounded by the resistance clamping portion 31a, the resistance flange portion 31d, and the outer surface of the steel pipe member SP (see Figure 15). The resistance clamping member 31 is joined to the steel pipe member SP by the adhesive 34 being filled into the formed space. In the fourth embodiment, before the resistance clamping member 31 is attached to the steel pipe member SP, adhesive 34 is filled into the space corresponding to the above space, which is divided into a resistance clamping portion 31a and a resistance flange portion 31d, and then the resistance clamping member 31 is attached to the steel pipe member SP. In the fourth embodiment, at least two (a pair in the fourth embodiment) resistance clamping members 31, 31 are fixed to each other by a joining plate 35 that is bonded so as to span the corresponding resistance flange portions 31d, 31d, as shown in Figure 14. The shear force resistance member 3 can exert greater resistance to the shear force received from the joining member 2 because at least two (a pair in the fourth embodiment) resistance clamping members 31, 31 are fixed to each other, so that when the shear force resistance member 3 receives a force from the joining member 2 along the longitudinal direction LD, the resistance clamping members 31, 31 are less likely to detach from the steel pipe member SP. The resistance clamping members 31, 31 may be fixed to each other by a stainless steel belt that encircles the entire circumference of their respective resistance clamping portions 31a, 31a, or they may be fixed to each other by adhesive.

The resistance clamping portion 31a is a portion that directly or indirectly contacts the outer surface of the steel pipe member SP and covers a part of the circumferential CD of the outer surface of the steel pipe member SP. By directly or indirectly contacting the outer surface of the steel pipe member SP, the resistance clamping portion 31a generates a frictional force between itself and the outer surface of the steel pipe member SP. In the first to third embodiments, the resistance clamping portion 31a is arranged to directly contact the outer surface of the steel pipe member SP, as shown in Figures 4 and 12. However, the resistance clamping portion 31a is not limited to the illustrated examples as long as it contacts the outer surface of the steel pipe member SP in such a way that a frictional force is generated between it and the outer surface of the steel pipe member SP. For example, it may be arranged to indirectly contact the surface via another material, such as a rubber material that increases the frictional force. In the fourth embodiment, the resistance clamping portion 31a is bonded to the outer surface of the steel pipe member SP via an adhesive 34, as shown in Figure 15. This creates an adhesive force between the resistance clamping portion 31a and the outer surface of the steel pipe member SP.

The resistance clamping portion 31a only needs to be able to directly or indirectly contact the outer surface of the steel pipe member SP, and its shape and size are not particularly limited. For example, in the first to third embodiments, the resistance clamping portion 31a is formed to have a shape and size corresponding to the shape and size of the outer surface of the steel pipe member SP. More specifically, as shown in Figures 4 and 12, the resistance clamping portion 31a is formed in a substantially half-cylindrical shape to correspond to the shape of the outer surface of the substantially cylindrical steel pipe member SP, and the inner diameter of the resistance clamping portion 31a is formed to be substantially the same as the outer diameter of the steel pipe member SP, or slightly larger than the outer diameter of the steel pipe member SP, to correspond to the size of the outer surface of the steel pipe member SP. For example, in the fourth embodiment, as shown in Figures 13 to 15, the resistance clamping portion 31a is formed in a substantially half-cylindrical shape to correspond to the shape of the outer circumference of the substantially cylindrical steel pipe member SP, and the inner diameter of the resistance clamping portion 31a is formed to be larger than the outer diameter of the steel pipe member SP so that adhesive 34 can be filled between the resistance clamping portion 31a and the outer surface of the steel pipe member SP. In the fourth embodiment, the resistance clamping portion 31a only needs to have an inner diameter larger than the outer diameter of the steel pipe member SP so that adhesive 34 can be filled, and is not particularly limited, but it is preferable that it has substantially the same diameter as the joining clamping portion 21a of the joining member 2 and is formed and arranged so that they are aligned substantially in the same straight line in a cross section along the longitudinal direction LD (see Figure 15). As a result, when force is transmitted from the joining member 2 to the shear force resistance member 3, deformation of the joining member 2 and the shear force resistance member 3 is suppressed, and the resistance force of the shear force resistance member 3 can be increased. In this embodiment, the resistance clamping portion 31a is formed in a substantially half-cylindrical shape. However, if the steel pipe member SP is formed in a cylindrical shape other than a cylindrical shape, it may be formed in a substantially half-cylindrical shape corresponding to the shape of the outer circumference of the steel pipe member SP. Furthermore, the resistance clamping portion 31a is not limited to a substantially half-cylindrical shape, as long as it can cover a portion of the circumferential direction CD of the outer circumference of the steel pipe member SP; it may be formed in a partially cylindrical shape such as a 1/3 or 2/3 cylinder. Also, the resistance clamping portion 31a may be formed to a size such that a gap is created between the resistance clamping portions 31a, 31a when the steel pipe member SP is clamped in the clamping direction SD2 together with the other resistance clamping portion 31a.

In the first to third embodiments, the resistance flange portion 31b is fixed to the resistance flange portion 31b of another resistance clamping member 31 adjacent to the steel pipe member SP in the circumferential direction CD, thereby fixing adjacent resistance clamping members 31, 31 to each other in the circumferential direction CD of the steel pipe member SP. In the first to third embodiments, as shown in Figures 1, 2, 4, 7, and 9, 10, 12, the resistance flange portion 31b is formed in a plate shape so as to extend radially outward from both ends of the resistance clamping portion 31a in the circumferential direction CD, along a direction substantially perpendicular to both the longitudinal direction LD and the clamping direction SD2. However, as long as the resistance flange portion 31b is formed to extend radially outward from the end of the resistance clamping portion 31a in the circumferential direction CD, its direction of extension is not limited to a direction substantially perpendicular to both the longitudinal direction LD and the clamping direction SD2, and can be appropriately modified according to the arrangement of the resistance flange portion 31b of the other resistance clamping member 31 to which it is fixed. Although the resistance clamping member 31 of the joining structure 1 in the fourth embodiment does not have the resistance flange portion 31b described above, it may be provided with the resistance flange portion 31b, similar to the joining structure 1 in the first to third embodiments. In that case, at least two (a pair in the fourth embodiment) resistance clamping members 31, 31 are fixed to each other via the resistance flange portions 31b, 31b.

In the first to third embodiments, it is preferable that the shear force resistance member 3 is joined to the steel pipe member SP such that the frictional force between it and the steel pipe member SP is as large as possible. More specifically, it is preferable that the shear force resistance member 3 is joined to the steel pipe member SP such that the frictional force between it and the steel pipe member SP is greater than the frictional force (and possibly adhesive force) between the joining member 2 and the steel pipe member SP. By doing so, the relative movement of the joining member 2 with respect to the steel pipe member SP in the longitudinal direction LD can be further suppressed. For the purpose of increasing the frictional force between the shear force resistance member 3 and the steel pipe member SP, in the first to third embodiments, as shown in Figure 5(a), at least two (a pair in the first to third embodiments) resistance clamping members 31, 31 are arranged such that the resistance clamping portions 31a, 31a of at least two resistance clamping members 31, 31 are in direct or indirect contact with the outer surface of the steel pipe member SP, while before they are fixed to each other by the clamping bolts 32, a gap G is created between the opposing resistance flange portions 31b, 31b of adjacent resistance clamping members 31, 31 in the circumferential direction CD of the steel pipe member SP. As shown in Figure 5(b), at least two resistance clamping members 31, 31 are joined to the steel pipe member SP by clamping bolts 32 extending in directions opposite each other, so as to clamp the steel pipe member SP in a direction substantially perpendicular to the longitudinal direction LD (clamping direction SD2 in the first to third embodiments) and apply compressive force to the steel pipe member SP. This increases the clamping force on the steel pipe member SP by the resistance clamping members 31, 31, thereby increasing the frictional force between the resistance clamping members 31, 31 and the steel pipe member SP. The above configuration can also be applied when the resistance clamping member 31 of the joining structure 1 in the fourth embodiment is provided with a resistance flange portion 31b.

Furthermore, in this embodiment, in order to increase the frictional force or adhesive force between the shear force resistance member 3 and the steel pipe member SP, the surface roughness of the surface of the joint SP1 (see Figure 6) of the steel pipe member SP to which the shear force resistance member 3 is joined may be increased. This makes it possible to further increase the frictional force or adhesive force between the shear force resistance member 3 and the steel pipe member SP, and to further suppress the relative movement of the joining member 2 in the longitudinal direction LD. Moreover, by increasing the surface roughness of the surface of the joint SP1 of the steel pipe member SP to which the shear force resistance member 3 is joined, the surface roughness of the surface of the joint SP1 may become greater than the surface roughness of the surface of the joint SP2 (see Figure 6) of the steel pipe member SP to which the joining member 2 is joined. As a result, the frictional force between the joining member 2 and the steel pipe member SP becomes smaller than the frictional force between the shear force resistance member 3 and the steel pipe member SP. Therefore, when joining the joining member 2 and the shear force resistance member 3 to the steel pipe member SP, the sliding of the joining member 2 against the steel pipe member SP in the longitudinal direction LD becomes easier, and the alignment of the joining member 2 with respect to the steel pipe member SP becomes easier.

In the first to third embodiments, the shear force resistance member 3 may be provided with a rib plate 31c extending substantially perpendicular to the longitudinal direction LD and on the opposite side from the steel pipe member SP, as shown in Figures 1, 2, 4, 7, and 9, 10, 12. By providing the shear force resistance member 3 with a rib plate 31c extending substantially perpendicular to the longitudinal direction LD, deformation in the direction in which the rib plate 31c extends is suppressed, and the joint strength to the steel pipe member SP can be increased. In this embodiment, the rib plate 31c is provided as part of the resistance clamping member 31 and extends substantially perpendicular to the longitudinal direction LD from the surfaces of the resistance clamping portion 31a and the resistance flange portion 31b. This suppresses deformation of the resistance clamping portion 31a and the resistance flange portion 31b in the direction in which the rib plate 31c extends. In the first to third embodiments, as described above, the resistance clamping members 31, 31 are formed such that a gap G is provided between the resistance flange portions 31b, 31b before they are fixed to each other. Therefore, when they are fixed to each other by the clamping bolts 32, bending stress is generated in a direction substantially perpendicular to the longitudinal direction LD. The rib plate 31c resists this bending stress, thereby suppressing the deformation of the resistance clamping members 31, 31 when they are fixed to each other, and suppressing the reduction in frictional force between the resistance clamping portions 31a, 31a and the outer surface of the steel pipe member SP. In the fourth embodiment, as shown in Figures 13 to 15, the resistance clamping member 31 of the shear force resistance member 3 is provided with a resistance flange portion 31d, and this resistance flange portion 31d has the same function as the rib plate 31c described above. However, the shear force resistance member 3 in the fourth embodiment may also be provided with the rib plate 31c described above, similar to the shear force resistance member 3 of the joint structure 1 in the first to third embodiments.

Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above. The embodiments described above primarily describe an invention having the following configuration.

(1) A joining structure for joining a reinforcing member to a steel pipe member of an existing structure,
A joining member is joined to the steel pipe member so as to cover the outer circumference of the steel pipe member, and to which the reinforcing member is joined,
The system includes a shear force resistance member that is joined to the steel pipe member so as to cover the outer circumference of the steel pipe member,
A joining structure in which the shear force resistance member is arranged to directly or indirectly contact the joining member in the longitudinal direction of the steel pipe member.

(2) The shear force resistance member is joined to the steel pipe member on both sides in the longitudinal direction, with the joining member in between.
The joining structure described in (1).

(3) A pair of shear force resistance members joined to the steel pipe member on both sides in the longitudinal direction with the joining member in between are connected to each other by connecting bolts extending in the longitudinal direction such that relative movement of each other in the direction separating them in the longitudinal direction is suppressed.
The joining structure described in (2).

(4) The shear force resistance member comprises at least two resistance clamping members that clamp the steel pipe member in a direction substantially perpendicular to the longitudinal direction of the steel pipe member and are fixed to each other,
The resistance clamping member comprises a partially cylindrical resistance clamping portion that directly or indirectly contacts the outer surface of the steel pipe member, and a resistance flange portion that extends radially outward from the circumferential end of the resistance clamping portion.
The at least two resistance clamping members are arranged such that the resistance clamping portion of each of the at least two resistance clamping members directly or indirectly abuts the outer surface of the steel pipe member, but before they are fixed to each other, a gap is created between the opposing resistance flange portions of adjacent resistance clamping members in the circumferential direction of the steel pipe member.
The at least two resistance clamping members are joined to the steel pipe member by clamping bolts that extend in directions in which the resistance flange portions face each other, so as to clamp the steel pipe member in a direction substantially perpendicular to the longitudinal direction and apply a compressive force to the steel pipe member.
A joining structure as described in any one of (1) to (3).

(5) The shear force resistance member is joined to the steel pipe member via an adhesive.
A joining structure as described in any one of (1) to (4).

(6) The joining member comprises at least two joining clamping members that clamp the steel pipe member in a direction substantially perpendicular to the longitudinal direction of the steel pipe member and are fixed to each other,
The joining clamping member comprises a partially cylindrical joining clamping portion that directly or indirectly contacts the outer surface of the steel pipe member, and a joining flange portion that extends radially outward from the circumferential end of the joining clamping portion.
The at least two joining clamping members are joined to the steel pipe member by fixing the opposing joining flange portions of adjacent joining clamping members in the circumferential direction of the steel pipe member to each other by fixing members extending in the direction in which the joining flange portions face each other.
The fixing member for at least two joining clamping members is arranged radially adjacent to the steel pipe member such that the joining flange portions of adjacent joining clamping members in the circumferential direction of the steel pipe member are prevented from widening the gap between them due to the force received from the reinforcing member.
A joining structure as described in any one of (1) to (5).

(7) The joining member is provided with a rib plate that extends substantially perpendicular to the longitudinal direction and on the side opposite to the steel pipe member.
A joining structure as described in any one of (1) to (6).

(8) The surface roughness of the surface of the joint of the steel pipe member to which the shear force resistance member is joined is greater than the surface roughness of the surface of the joint of the steel pipe member to which the joining member is joined.
A joining structure as described in any one of (1) to (7).

1. Joining structure 2. Joining members 21. Joining clamping member 21a. Joining clamping part 21b. Joining flange part 21c. Rib plate 21d. Joining flange part 22. Clamping bolt 23. Clamping washer 24. Connecting member 25. Filler material 3. Shear force resistance member 31. Resistance clamping member 31a. Resistance clamping part 31b. Resistance flange part 31c. Rib plate 31d. Resistance flange part 32. Clamping bolt 33. Connecting bolt 34. Adhesive 35. Joining plate BD. Reinforcement member (brace)
CD: Circumferential direction; CM1, CM2: Connecting members; G: Gap; H: Injection hole; HS: Reinforcement member (H-shaped steel)
LD: Longitudinal direction; SD1, SD2: Clamping direction; SP: Steel pipe member; SP1: Joint point of the steel pipe member to which the shear force resistance member is joined; SP2: Joint point of the steel pipe member to which the joining member is joined.

Claims (8)

A joining structure for joining reinforcing members to steel pipe members of an existing structure,
A joining member is joined to the steel pipe member so as to cover the outer circumference of the steel pipe member, and to which the reinforcing member is joined, wherein the joining member is joined to the steel pipe member such that the relative movement of the steel pipe member in the longitudinal direction is suppressed by the frictional force or adhesive force generated between the joining member and the steel pipe member ,
The system includes a shear force resistance member that is joined to the steel pipe member so as to cover the outer circumference of the steel pipe member,
A joining structure in which the shear force resistance member is arranged to directly or indirectly contact the joining member in the longitudinal direction of the steel pipe member. The shear force resistance member comprises at least two resistance clamping members that clamp the steel pipe member in a direction substantially perpendicular to the longitudinal direction of the steel pipe member and are fixed to each other.
The aforementioned resistance clamping member,
A partially cylindrical resistance clamping portion that indirectly contacts the outer surface of the steel pipe member,
On both sides of the longitudinal direction, flanking the resistance clamping portion, there are resistance flanges extending from the inside to the outside in the radial direction of the resistance clamping portion, over substantially the entire circumferential direction of the resistance clamping portion.
Equipped with,
The resistance clamping member is joined to the steel pipe member by filling the space surrounded by the resistance clamping portion, the resistance flange portion, and the outer surface of the steel pipe member with adhesive.
The joining structure according to claim 1. The joining member comprises at least two joining clamping members that clamp the steel pipe member in a direction substantially perpendicular to the longitudinal direction of the steel pipe member and are fixed to each other,
The aforementioned joining clamping member,
A partially cylindrical joining clamping portion that indirectly contacts the outer surface of the steel pipe member,
On both sides of the longitudinal direction, flanking the aforementioned joining clamping portion, there are joining flanges that extend from the inside to the outside in the radial direction of the joining clamping portion, extending over substantially the entire circumferential direction of the joining clamping portion.
Equipped with,
When the joining clamping member is joined to the steel pipe member, a space is formed in the area surrounded by the joining clamping portion, the joining flange portion, and the outer surface of the steel pipe member, where grout or adhesive is filled.
The joining structure according to claim 1 or 2. The shear force resistance member is joined to the steel pipe member on both sides in the longitudinal direction, with the joining member in between.
The joining structure according to claim 1. A joining structure for joining reinforcing members to steel pipe members of an existing structure,
A joining member is joined to the steel pipe member so as to cover the outer circumference of the steel pipe member, and to which the reinforcing member is joined,
A shear force resistance member is joined to the steel pipe member so as to cover the outer circumference of the steel pipe member.
Equipped with,
The shear force resistance member is arranged so as to be in direct or indirect contact with the joining member in the longitudinal direction of the steel pipe member.
The shear force resistance member is joined to the steel pipe member on both sides in the longitudinal direction, with the joining member in between.
A pair of shear force resistance members, joined to the steel pipe member on both sides of the joint member in the longitudinal direction, are connected to each other by connecting bolts extending in the longitudinal direction, such that relative movement between them in the direction of separation in the longitudinal direction is suppressed.
Joint structure. A joining structure for joining reinforcing members to steel pipe members of an existing structure,
A joining member is joined to the steel pipe member so as to cover the outer circumference of the steel pipe member, and to which the reinforcing member is joined,
A shear force resistance member is joined to the steel pipe member so as to cover the outer circumference of the steel pipe member.
Equipped with,
The shear force resistance member is arranged so as to be in direct or indirect contact with the joining member in the longitudinal direction of the steel pipe member.
The shear force resistance member comprises at least two resistance clamping members that clamp the steel pipe member in a direction substantially perpendicular to the longitudinal direction of the steel pipe member and are fixed to each other.
The resistance clamping member comprises a partially cylindrical resistance clamping portion that directly or indirectly contacts the outer surface of the steel pipe member, and a resistance flange portion that extends radially outward from the circumferential end of the resistance clamping portion.
The at least two resistance clamping members are arranged such that the resistance clamping portion of each of the at least two resistance clamping members directly or indirectly abuts the outer surface of the steel pipe member, but before they are fixed to each other, a gap is created between the opposing resistance flange portions of adjacent resistance clamping members in the circumferential direction of the steel pipe member.
The at least two resistance clamping members are joined to the steel pipe member by clamping bolts that extend in directions in which the resistance flange portions face each other, so as to clamp the steel pipe member in a direction substantially perpendicular to the longitudinal direction and apply a compressive force to the steel pipe member.
Joint structure. The joining member comprises at least two joining clamping members that clamp the steel pipe member in a direction substantially perpendicular to the longitudinal direction of the steel pipe member and are fixed to each other,
The joining clamping member comprises a partially cylindrical joining clamping portion that directly or indirectly contacts the outer surface of the steel pipe member, and a joining flange portion that extends radially outward from the circumferential end of the joining clamping portion.
The at least two joining clamping members are joined to the steel pipe member by fixing the opposing joining flange portions of adjacent joining clamping members in the circumferential direction of the steel pipe member to each other by fixing members extending in the direction in which the joining flange portions face each other.
The fixing member for at least two joining clamping members is arranged radially adjacent to the steel pipe member such that the joining flange portions of adjacent joining clamping members in the circumferential direction of the steel pipe member are prevented from widening the gap between them due to the force received from the reinforcing member.
The joining structure according to claim 1 or 2 . The surface roughness of the surface of the joint portion of the steel pipe member to which the shear force resistance member is joined is greater than the surface roughness of the surface of the joint portion of the steel pipe member to which the joining member is joined.
The joining structure according to claim 1 or 2 .