Joint portion structure
The joint structure enhances steel pipe connections using movable joint parts with convex and concave intersections and curved plate members, enabling efficient assembly with ordinary bolts for durable and cost-effective construction.
Patent Information
- Application Number
- JP2024068712
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2025-10-30
AI Technical Summary
Existing steel pipe connection methods, such as welding and high-strength bolt connections, are inefficient, require skilled labor, and are costly, making them unsuitable for large-scale construction projects like bridges and offshore wind farms, especially in severe environments.
A joint structure that uses movable joint parts with convex and concave portions intersecting at right angles, supported by curved plate members, and connected with ordinary bolts, allowing for easy assembly and effective shear force transmission.
Improves construction site workability by preventing initial slippage and ensuring durable connections using ordinary bolts, reducing construction time and costs while maintaining structural integrity.
Smart Images
Figure 2025164610000001_ABST
Abstract
Description
[Technical Field]
[0001] The present disclosure relates to a joint structure for connecting members used in, for example, steel pipe piles, steel pipe sheet piles, steel pipes for pipe roof construction, pillar materials for buildings, water pipelines, and the like. [Background technology]
[0002] Conventionally, when constructing long steel pipe piles or steel pipe sheet piles, for convenience of transportation and manufacturing, steel pipe materials of fixed lengths were brought to the construction site, and the steel pipe materials were then connected by welding at the construction site to form the desired length.
[0003] However, such welding connection work requires skilled techniques and strict construction management in terms of ensuring working conditions such as climatic conditions, quality control of welded joints, etc. Furthermore, the time spent on such welding work accounts for a large proportion of the construction time, causing the construction period to be extended.
[0004] Furthermore, steel pipes are connected using high-strength bolts in addition to welding. For example, Patent Document 1 discloses that at the joint between upper and lower steel pipes, multiple splice plates for joining are placed inside the joint, and high-strength bolts are inserted into bolt holes that pass through the splice plates and each steel pipe body to fasten them. This connection method in Patent Document 1 is aimed at joining by frictional force using high-strength bolts. [Prior art documents] [Patent documents]
[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-202218 Summary of the Invention [Problem to be solved by the invention]
[0006] As disclosed in Patent Document 1, high-strength bolts are used to connect steel pipes, but these bolts are expensive and may be difficult to obtain due to external factors such as social conditions. Therefore, it is desirable to connect members such as steel pipes without using high-strength bolts.
[0007] Furthermore, in recent years, bridges and offshore wind power generation facilities have tended to become larger, and the working environment at construction sites has tended to become even more severe. Therefore, there is a strong demand for improving the workability of connecting steel pipes and other components at construction sites.
[0008] The present disclosure aims to provide a joint structure that enables work at construction sites to be carried out using ordinary bolts, rather than requiring a joint structure that relies on frictional force using high-strength bolts, while also enabling work to be carried out at construction sites using ordinary bolts. [Means for solving the problem]
[0009] One aspect of the present disclosure is a first joint part and a second joint part that are movable relative to each other and abut against each other in a first direction, the first joint part and the second joint part each having a first main convex part and a second main convex part that extend in a second direction that intersects with the first direction, and the first main convex part in each of the first joint part and the second joint part protruding in a direction opposite to the second main convex part; a first support member that is overlapped on the first main convex portion side of the butted first joint part and the second joint part so as to extend from the first joint part to the second joint part, the first support member having a first sub-concave portion into which the first main convex portion of the first joint part and the second joint part is fitted; a second support member that is overlapped on the second main convex portion side of the butted first joint part and the second joint part so as to extend from the first joint part to the second joint part, the second support member having a second sub-concave portion into which the second main convex portion of the first joint part and the second joint part is fitted; a connecting member attached to a hole that penetrates from the first support member to the second support member via one of the first joint portion and the second joint portion; Equipped with Joint structure to provide.
[0010] According to the above configuration, the first support member is positioned relative to the first and second joint parts by fitting the first main convex portions of the butted first and second joint parts into the first sub-concave portions of the first support member, and the second support member is positioned relative to the first and second joint parts by fitting the second main convex portions of the butted first and second joint parts into the second sub-concave portions of the second support member, and the first and second joint parts can be connected by attaching a connecting member thereto, thereby improving workability at the construction site. Also, the first main convex portion and the second main convex portion extend in a second direction intersecting the first direction, which is the butt direction of the first and second joint parts, and similarly, the first sub-concave portions into which the first main convex portions fit and the second sub-concave portions into which the second main convex portions fit extend. Therefore, even if a shear force occurs between the first joint part and the second joint part, it can be absorbed by the engagement between the first main convex part and the first sub-concave part and the engagement between the second main convex part and the second sub-concave part, and the above joint part structure can preferably exhibit sufficient durability against the shear force. Therefore, for example, initial slippage between the first joint part and the second joint part can be reliably prevented, and the first and second joint parts can be more effectively connected. Therefore, instead of requiring a joint part structure that relies on friction using high-strength bolts, it is possible to preferably perform the connection work of the first joint part and the second joint part at a construction site using connecting members such as ordinary bolts, with the strength transmission against shear force due to the engagement between the convex part and the concave part.
[0011] Preferably, the second direction intersects the first direction at a right angle. This configuration makes it possible to more effectively transmit strength against shear force between the first joint part and the second joint part.
[0012] Preferably, the first major convex portion has a first inclined side surface, the first minor recess portion has a first inclined surface corresponding to the first inclined side surface, the second major convex portion has a second inclined side surface, and the second minor recess portion has a second inclined surface corresponding to the second inclined side surface. This configuration allows the first and second joint portions to be more appropriately positioned. This also makes it possible to more reliably prevent relative displacement between the first and second joint portions, such as initial slippage, and more reliably connect the first and second joint portions.
[0013] For example, the first joint portion is provided on a first steel pipe, and the second joint portion is provided on a second steel pipe. In this case, the first direction may be the axial direction of the first steel pipe and the second steel pipe. In this case, the first steel pipe and the second steel pipe can be suitably connected using the joint portion structure.
[0014] For example, the first joint portion is provided on a first curved plate material, and the second joint portion is provided on a second curved plate material, and in this case, the first curved plate material and the second curved plate material can be suitably connected using the joint portion structure. [Effects of the Invention]
[0015] According to the joint structure of the above-mentioned one aspect, since it has the above-mentioned configuration, it is possible to improve workability at the construction site, and it is possible to perform work at the construction site using connecting members such as ordinary bolts, rather than requiring a joint structure that relies on frictional force using high-strength bolts. [Brief explanation of the drawings]
[0016] [Figure 1] FIG. 1 is a diagram showing an example of steel pipes connected using the joint structure according to the first embodiment, where (a) is a top view thereof and (b) is a front view thereof. [Figure 2] FIG. 2 is a cross-sectional view of the steel pipe taken along line II-II of FIG. 1(b). [Figure 3] FIG. 3 is an enlarged view of part III in FIG. [Figure 4] FIG. 4 is an explanatory diagram illustrating the process of connecting a joint member of one steel pipe material to a joint member of the other steel pipe material that are connected to form a steel pipe, and is an exploded view of the connection point. [Figure 5] FIG. 5 is an explanatory diagram illustrating the process of connecting a joint member of one steel pipe material to a joint member of the other steel pipe material that are connected to form a steel pipe, and is an exploded view of a portion of the connection point between them. [Figure 6] FIG. 6 is an explanatory diagram illustrating the process of connecting a joint member of one steel pipe material to a joint member of the other steel pipe material that are connected to form a steel pipe, and is an exploded view of a portion of the connection point between them. [Figure 7] FIG. 7 is an explanatory diagram illustrating the process of connecting a joint member of one steel pipe material to a joint member of the other steel pipe material that are connected to form a steel pipe, and shows the connection points between them. [Figure 8] FIG. 8 is an explanatory diagram illustrating the process of connecting a joint member of one steel pipe material to a joint member of the other steel pipe material that are connected to form a steel pipe, and shows the state in which the connection is completed by bolt tightening. [Figure 9] FIG. 9 is a diagram showing a modification of the first embodiment, and is an enlarged view corresponding to FIG. [Figure 10] FIG. 10 is a front view showing an example of steel pipes connected using the joint structure according to the second embodiment. [Figure 11] FIG. 11 is a cross-sectional view of the steel pipe taken along line XI-XI in FIG. [Figure 12] FIG. 12 is an enlarged view of the X11 portion of FIG. [Figure 13] FIG. 13 is a diagram showing a modification of the second embodiment, and is an enlarged view corresponding to FIG. DETAILED DESCRIPTION OF THE INVENTION
[0017] Hereinafter, joint structures according to embodiments of the present disclosure will be described with reference to the drawings. First, a first embodiment will be described.
[0018] 1(a) and 1(b) show steel pipes 1 connected using a joint structure 10 according to the first embodiment, and FIG. 2 shows a cross-sectional view of the steel pipe 1 taken along line II-II in FIG. 1(b). Note that line II-II in FIG. 1(b) extends to include the pipe axis A1 of the steel pipe 1. FIG. 3 is an enlarged view of part III in FIG. 2. FIGS. 4 to 8 are diagrams illustrating the process of connecting a joint member 16 of one steel pipe member 12 to a joint member 18 of the other steel pipe member 14, among steel pipe members 12 and 14 that are connected to form the steel pipe 1. The steel pipe 1 described here can be used as part of a steel pipe pile, a steel pipe sheet pile, or the like.
[0019] Each of the steel pipes 12, 14 is a steel pipe formed into a cylindrical shape using steel material. The steel pipes 12, 14 are connected to each other by a joint J. The joint structure 10 is applied to this joint J.
[0020] As shown in Figures 2 and 3, the joint J comprises a joint part (hereinafter referred to as the first joint part) 16 fixed to one end of one steel pipe 12, and a joint part (hereinafter referred to as the second joint part) 18 fixed to one end of the other steel pipe 14. The first joint part 16 is fixed to the steel pipe 12 by welding, and the second joint part 18 is fixed to the steel pipe 14 by welding, although the weld buildup is not shown. The first joint part 16 corresponds to the first joint part, and the second joint part 18 corresponds to the second joint part.
[0021] As shown in FIG. 3, the first joint member 16 is formed in an annular shape like the steel pipe 12, and has approximately the same inner and outer diameters as the steel pipe 12. Similarly, the second joint member 18 is formed in an annular shape like the steel pipe 14, and has approximately the same inner and outer diameters as the steel pipe 14. Because the steel pipes 12, 14 are manufactured to approximately the same dimensions or standards, the first joint member 16 and the second joint member 18 have approximately the same inner and outer diameters. Here, the first joint member 16 and the second joint member 18 have approximately the same length in the direction of the pipe axis A1 of the steel pipe 1. More specifically, the steel pipe 12 with the first joint member 16 has substantially the same configuration as the steel pipe 14 with the second joint member 18.
[0022] The steel pipe members 12, 14 are movable relative to each other, and therefore the first and second joint parts 16, 18 are movable relative to each other. Both joint parts 16, 18 are cylindrical, i.e., tubular. The two joint parts 16, 18 can be moved relative to each other in the axial direction along the pipe axis A1, the circumferential direction A2 around the pipe axis A1, and / or the radial direction centered on the pipe axis A1. The joint parts 16, 18 are butted against each other in the axial direction along the pipe axis A1. In this embodiment, the first joint part 16 is butted against the front end 18E of the second joint part 18 until the front end 16E of the first joint part 16 abuts against the front end 18E of the second joint part 18. Here, this butting direction along the pipe axis A1 is the first direction. Note that the joint parts 16, 18 are butted against each other in the axial direction, which is the first direction. In this first embodiment, they may abut against each other, but the present disclosure does not exclude them being butted against each other with a gap.
[0023] The first joint part 16 of the steel pipe material 12 and the second joint part 18 of the steel pipe material 14 each have a first main convex part 20 and a second main convex part 22 extending in a direction (corresponding to the second direction) that intersects the pipe axial direction at a right angle. Note that the first direction, which is the pipe axial direction, and the second direction, which is the circumferential direction in which the first main convex part 20 or the second main convex part 22 extends, intersect at a right angle here, but this intersection angle is not limited to a right angle and can be set to any angle, such as an oblique angle of 60°, but is preferably a right angle.
[0024] The first main convex portion 20 is formed on the outer peripheral surface 16o of the first joint part 16, and is also formed on the outer peripheral surface 18o of the second joint part 18. Here, the number of first main convex portion 20 formed on the outer peripheral surface 16o of the first joint part 16 is one, but may be multiple. Also, the number of first main convex portion 20 formed on the outer peripheral surface 18o of the second joint part 18 is one, but may be multiple.
[0025] The second main convex portion 22 is formed on the inner circumferential surface 16i of the first joint part 16, and is also formed on the inner circumferential surface 18i of the second joint part 18. Here, the number of second main convex portion 22 formed on the inner circumferential surface 16i of the first joint part 16 is one, but may be multiple. Also, the number of second main convex portion 22 formed on the inner circumferential surface 18i of the second joint part 18 is one, but may be multiple.
[0026] In this embodiment, the first main convex portion 20 and the second main convex portion 22 are provided so as to be offset in the pipe axis direction in the first joint part 16. As is clear from the fact that the first joint part 16 and the second joint part 18 have the same configuration, in this embodiment, the first main convex portion 20 and the second main convex portion 22 are provided so as to be offset in the pipe axis direction in the second joint part 18. However, in each joint part 16, 18, the first main convex portion 20 and the second main convex portion 22 may be completely aligned or may partially overlap in the pipe axis direction.
[0027] When the front end 16E of the first joint part 16 is moved relative to the front end 18E of the second joint part 18 and the first joint part 16 and the second joint part 18 are butted together in the pipe axis direction, an outer support member (hereinafter referred to as the first support member) 24 is superimposed on the first joint part 16 and the second joint part 18 on the first main convex part 20 side, i.e., on the outside of the steel pipes 12, 14, so as to extend from the first joint part 16 to the second joint part 18. At this time, a recess (hereinafter referred to as the first sub-recess) 26 into which the first main convex part 20 fits is formed in the first support member 24. It is preferable that the first main convex part 20 and the first sub-recess 26 are fitted together with as little gap as possible. The first support member 24 is generally configured as a curved plate material. The first support members 24 have a circumferential length along an arc at a predetermined angle with respect to the pipe axis A1 so as to enable attachment and detachment of the first support members 24, and a plurality of first support members 24 are used to connect the first joint part 16 and the second joint part 18. In this example, the predetermined angle is 90°, and four first support members 24 are used to connect the first joint part 16 and the second joint part 18. The number of first support members 24 is not limited to this. By overlapping the first support members 24, the first support members 24 extend from the middle of the first joint part 16 to the middle of the second joint part 18 in the pipe axis direction (see, for example, FIG. 3 ). However, the present invention is not limited to this, and the first support members 24 may extend, for example, from the base end of the first joint part 16 (the end on the steel pipe 12 side) to the base end of the second joint part 18 (the end on the steel pipe 14 side).
[0028] When the front end 16E of the first joint part 16 is moved relative to the front end 18E of the second joint part 18 and the first joint part 16 and the second joint part 18 are butted together in the pipe axis direction, the inner support member (hereinafter referred to as the second support member) 28 is superimposed on the first joint part 16 and the second joint part 18 on the second main convex part 22 side, i.e., on the inside of the steel pipes 12, 14, so as to extend from the first joint part 16 to the second joint part 18. At this time, a recess (hereinafter referred to as the second sub-recess) 30 into which the second main convex part 22 fits is formed in the second support member 28. It is preferable that the second main convex part 22 and the second sub-recess 30 are fitted together with as little gap as possible. The second support member 28 is generally configured as a curved plate material. The second support members 28 have a circumferential length along an arc at a predetermined angle with respect to the pipe axis A1 so as to enable attachment and detachment of the second support members 28, and a plurality of second support members 28 are used to connect the first joint part 16 and the second joint part 18. In this example, the predetermined angle is 90°, and four second support members 28 are used to connect the first joint part 16 and the second joint part 18. The number of second support members 28 is not limited to this. By overlapping the second support members 28, the second support members 28 extend from the middle of the first joint part 16 to the middle of the second joint part 18 in the pipe axis direction (see, for example, FIG. 3 ). However, the present invention is not limited to this, and the second support members 28 may extend, for example, from the base end of the first joint part 16 (the end on the steel pipe 12 side) to the base end of the second joint part 18 (the end on the steel pipe 14 side).
[0029] When the first joint part 16 and the second joint part 18 are butted together so that their pipe axes coincide, a hole (hereinafter referred to as the first hole) 32 is formed on the first joint part 16 side, penetrating from the first support part 24 to the second support part 28 via the first joint part 16, and a hole (hereinafter referred to as the second hole) 34 is formed on the second joint part 18 side, penetrating from the first support part 24 to the second support part 28 via the second joint part 18. The first hole 32 is formed by continuously arranging the through hole 24H of the first support part 24, the through hole 16H of the first joint part 16, and the through hole 28H of the second support part 28. The second hole 34 is formed by continuously arranging the through hole 24H of the first support part 24, the through hole 18H of the second joint part 18, and the through hole 28H of the second support part 28. The first hole 32 does not overlap either the first main convex portion 20 or the second main convex portion 22 formed on the first joint part 16. Similarly, the second hole 34 does not overlap either the first main convex portion 20 or the second main convex portion 22 formed on the second joint part 18. A bolt B is inserted into the first hole 32 and a nut N is threaded onto the bolt B. Similarly, a bolt B is inserted into the second hole 34 and a nut N is threaded onto the bolt B. As shown in FIG. 3 , the bolt B is inserted from the outside to the inside of the first joint part 16 or the second joint part 18, and the nut N is disposed on the inside thereof. However, the bolt B may be inserted from the inside to the outside thereof, and the nut N may be disposed on the outside thereof. Note that the connecting members are not limited to the bolt B and the nut N. The bolt B is not a high-strength bolt, but this does not exclude the use of a high-strength bolt.
[0030] As described above, a method for assembling a joint J having a joint structure 10 including the first joint part 16, the second joint part 18, the first support part 24, the second support part 28, and the connecting parts, that is, the bolt B and the nut N, will be described with reference to Figs. 4 to 8.
[0031] First, a steel pipe 12 having a first joint member 16 at its tip and a steel pipe 14 having a second joint member 18 at its tip are arranged apart from each other in the pipe axial direction (see FIG. 4).
[0032] Then, the first joint part 16 of the steel pipe 12 and the second joint part 18 of the steel pipe 14 are moved relatively, for example, in the pipe axis direction, so that the steel pipe 12 having the first joint part 16 at its distal end and the steel pipe 14 having the second joint part 18 at its distal end are aligned and butted together so that the distal end 16E of the first joint part 16 and the distal end 18E of the second joint part 18 face each other (see FIG. 5). Here, the first joint part 16 and the second joint part 18 are butted together so that the distal ends 16E, 18E abut against each other. At this time, the positions of the first joint part 16 of the steel pipe 12 and the second joint part 18 of the steel pipe 14 are adjusted so that the pipe axis of the first joint part 16 coincides with the pipe axis of the second joint part 18 of the steel pipe 14.
[0033] Next, the second support member 28 is placed on and abutted against the inside of the first joint part 16 and the second joint part 18 (see FIG. 6). As a result, the second main convex parts 22 of the first joint part 16 and the second joint part 18 fit into the second sub-concave parts 30 of the second support member 28.
[0034] Then, the first support member 24 is placed on and abuts against the outer sides of the first joint part 16 and the second joint part 18 (see FIG. 7). As a result, the first main convex parts 20 of the first joint part 16 and the second joint part 18 fit into the first sub-concave parts 26 of the first support member 24.
[0035] The order of installing the first support member 24 on the first joint part 16 and the second joint part 18 and the second support member 28 on the first joint part 16 and the second joint part 18 may be reversed, or the installation of the support members 24 and 28 may be performed simultaneously.
[0036] Then, a bolt B is inserted into a first hole 32 formed on the first joint member 16 side, and the bolt B is screwed onto a nut N (see Figure 8). Similarly, a bolt B is inserted into a second hole 34 formed on the second joint member 18 side, and the bolt B is screwed onto a nut N (see Figure 8). This completes the connection of joint J. Note that Figure 8 shows that bolts B are inserted into only some of the holes 32, 34 and screwed onto the nuts N, but to connect joint J, bolts B are inserted into all of the holes 32, 34 and screwed onto the nuts N.
[0037] Some of the characteristic configurations of the joint portion structure 10 of the joint J having the above configuration and the resulting functions and effects will be described below.
[0038] The joint structure 10 comprises a first joint part 16, a second joint part 18, a first support part 24, a second support part 28, and bolts B and nuts N as connecting parts therebetween. The first joint part 16 and the second joint part 18 are movable relative to each other and are butted together in a first direction, i.e., the pipe axis direction. The first joint part 16 and the second joint part 18 each have a first main convex part 20 and a second main convex part 20 extending in a circumferential direction, i.e., a second direction intersecting the first direction. In each of the first joint part 16 and the second joint part 18, the first main convex part 20 protrudes in the opposite direction to the second main convex part 22. The first support part 24 is overlapped on the first main convex part 20 side of the butted first joint part 16 and second joint part 18 so as to extend from the first joint part 16 to the second joint part 18. The first support member 24 has a first minor recess 26 into which the first main convexities 20 of the first and second joint parts 16 and 18 fit. The second support member 28 is overlapped on the side of the second main convexities 22 of the butted first and second joint parts 16 and 18 so as to extend from the first joint part 16 to the second joint part 18. The second support member 28 has a second minor recess 30 into which the second main convexities 22 of the first and second joint parts 16 and 18 fit. A bolt B and a nut N are attached to holes 32, 34 that pass through either the first joint part 16 or the second joint part 18 from the first support member 24 to the second support member 28.
[0039] In the joint structure 10 having this configuration, the first support member 24 is positioned relative to the first joint member 16 and the second joint member 18 by fitting the first main convex portion 20 of the butted first joint member 16 and the second joint member 18 into the first sub-recess 26 of the first support member 24, and the second support member 28 is positioned relative to the first joint member 16 and the second joint member 18 by fitting the second main convex portion 22 of the butted first joint member 16 and the second joint member 18 into the second sub-recess 30 of the second support member 28. Then, the first joint member 16 and the second joint member 18 can be connected by attaching the bolts B and nuts N thereto, thereby improving workability at the construction site. Furthermore, the first main convex portion 20 and the second main convex portion 22 extend in a second direction intersecting the first direction, which is the butt direction of the first coupling part 16 and the second coupling part 18. Similarly, the first sub-concave portion 26 into which the first main convex portion 20 fits and the second sub-concave portion 30 into which the second main convex portion 22 fits extend in the second direction. Therefore, even if a shear force occurs between the first coupling part 16 and the second coupling part 18, it can be absorbed by the engagement between the first main convex portion 20 and the first sub-concave portion 26 and the engagement between the second main convex portion 22 and the second sub-concave portion 30, and the joint structure 10 can preferably exhibit sufficient durability against the shear force. Therefore, for example, initial slippage between the first coupling part 16 and the second coupling part 18 can be reliably prevented, and the first coupling part 16 and the second coupling part 18 can be more effectively connected. Therefore, rather than requiring a joint structure that relies on frictional force using high-strength bolts, it is possible to suitably perform the connection work of the first joint member 16 and the second joint member 18 at the construction site using connecting members such as ordinary bolts B, with strength transmitted against shear force by the fitting of the convex and concave portions.
[0040] Furthermore, in the joint structure 10, the circumferential direction, which is the second direction, intersects the axial direction, which is the first direction, at a right angle. This configuration allows for more optimal transmission of strength against shear forces between the first joint part 16 and the second joint part 18.
[0041] As shown in FIG. 3, in this embodiment, the cross-sectional shape of the first main convex portion 20 is generally rectangular, the cross-sectional shape of the second main convex portion 22 is generally rectangular, and the first sub-concave portion 26 and the second sub-concave portion 30 have corresponding generally rectangular concave shapes. However, the first main convex portion 20 may have a first inclined side surface 20a, and the first sub-concave portion 26 may have a first inclined surface 26a corresponding to the first inclined side surface 20a. Similarly, the second main convex portion 22 may have a second inclined side surface 22a, and the second sub-concave portion 30 may have a second inclined surface 30a corresponding to the second inclined side surface 22a. FIG. 9 shows a joint J1 having a joint portion structure 10A having such inclined side surfaces 20a, 22a, 26a, and 30a. Note that FIG. 9 is an enlarged view corresponding to FIG. 3. The inclined side surfaces 20a, 22a, 26a, and 30a are inclined with respect to the pipe axis A1 to form tapered inclined surfaces. Therefore, in the modified example of the first embodiment shown in Figure 9, the mating structure between the first main convex portion 20 and the first sub-concave portion 26 and the mating structure between the second main convex portion 22 and the second sub-concave portion 30 are each a tapered mating connection structure.
[0042] In this way, the first main convex portion 20 has a first inclined side surface 20a, the first sub-recess 26 has a first inclined surface 26a corresponding to the first inclined side surface 20a, the second main convex portion 22 has a second inclined side surface 22a, and the second sub-recess 30 has a second inclined surface 30a corresponding to the second inclined side surface 22a, which makes it possible to more appropriately position the first coupling part 16 and the second coupling part 18. This also makes it possible to more reliably prevent relative displacement between the first coupling part 16 and the second coupling part 18, such as initial slippage, and to more reliably connect the first coupling part 16 and the second coupling part 18.
[0043] Next, a second embodiment will be described. In the following, components corresponding to components already described will be designated by adding an additional "1" before the reference numerals already used, thereby indicating the correspondence between the components, and therefore, detailed overlapping explanations will be omitted. Note that the variations and modifications already described with respect to the first embodiment can also be applied to the second embodiment described below, and further explanation will be omitted.
[0044] Fig. 10 shows a steel pipe 1A connected using joints JA, JB, and JC to which a joint structure 110 according to the second embodiment is applied. Fig. 11 shows a cross-sectional view of the steel pipe 1A cut along line XI-XI in Fig. 10. Fig. 12 shows an enlarged view of part XII in Fig. 11.
[0045] In the joint structure 10, 10A of the above embodiments, the first joint part 16 is provided on the first steel pipe 12, and the second joint part 18 is provided on the second steel pipe 14, and the first direction is the axial direction of each of the first steel pipe 12 and the second steel pipe 14, i.e., the pipe axis direction. In contrast, in the joint structure 110 of the second embodiment, the first joint part 116 is provided on the first curved plate material, and the second joint part 118 is provided on the second curved plate material. The first direction is the circumferential direction A2, and the second direction is the direction of the pipe axis A1 (axial direction), i.e., the pipe axis direction.
[0046] In the second embodiment, a steel pipe 1A is produced by connecting three curved plate members 112, 114, and 115 with joints JA, JB, and JC of a joint structure 110. Each of the three curved plate members 112, 114, and 115 has a circumferential length corresponding to an arc of approximately 120° about the pipe axis A1, and is provided with a first joint portion 116 extending in the circumferential direction at one circumferential end portion 112A, 114A, and 115A, respectively, and a second joint portion 118 extending in the circumferential direction at the other circumferential end portion 112B, 114B, and 115B. The first joint portion 116 and the second joint portion 118 are initially provided in the curved plate members 112, 114, and 115 as part of each of the curved plate members 112, 114, and 115. However, the first joint portion 116 and the second joint portion 118 may be fabricated separately from the curved plate materials 112, 114, 115, and attached to the curved plate materials 112, 114, 115 by various methods such as welding. Note that, for example, the curved plate materials may be U-shaped pipes, and the steel pipe 1A may be formed by connecting two curved plate materials.
[0047] The curved plate members 112, 114, and 115 are movable relative to one another and butt against one another in the circumferential direction A2, so the first direction is the circumferential direction A2. In contrast, the first joint portion 116 and the second joint portion 118 are provided with a first main convex portion 120 and a second main convex portion 122 that extend in the direction of the tube axis A1, i.e., the tube axis direction. In other words, the second direction, which intersects with the first direction, is a direction that intersects with the first direction at a right angle. Furthermore, in each of the first joint portion 116 and the second joint portion 118, the first main convex portion 120 protrudes in the opposite direction to the second main convex portion 122. The curved plate members 112, 114, and 115 are aligned in the circumferential direction A2, which is the first direction, that is, butt against one another. While the curved plate members 112, 114, and 115 may be butted against one another in the second embodiment, the present disclosure does not exclude the possibility of them being butted against one another with a gap therebetween.
[0048] The first support member 124 is overlapped on the first main convex portion 120 side of the butted first joint portion 116 and second joint portion 118 so as to extend from the first joint portion 116 to the second joint portion 118. The first support member 124 has a first sub-recess 126 into which the first main convex portion 120 of the first joint portion 116 and the second joint portion 118 fits. The first sub-recess 126 extends in the pipe axial direction.
[0049] The second support member 128 is overlapped on the side of the second main convex portion 122 of the butted first joint part 116 and second joint part 118 so as to extend from the first joint part 116 to the second joint part 118. The second support member 128 has a second sub-recess 130 into which the second main convex portion 122 of the first joint part 116 and second joint part 118 fits. The second sub-recess 130 extends in the pipe axial direction.
[0050] The bolt B and nut N are then attached to holes 132 and 134 that pass through from the first support member 124 to the second support member 128 via either the first joint portion 116 or the second joint portion 118 .
[0051] In this way, the joint structure 110 according to the second embodiment is used to connect curved plate materials.
[0052] In the joint structure 110 having this configuration, the first support member 124 is positioned relative to the first joint part 116 and the second joint part 118 by fitting the first main convex part 120 of the butted first joint part 116 and the second joint part 118 into the first sub-recess 126 of the first support member 124, and the second support member 128 is positioned relative to the first joint part 116 and the second joint part 118 by fitting the second main convex part 122 of the butted first joint part 116 and the second joint part 118 into the second sub-recess 130 of the second support member 128. Then, by attaching a bolt B and a nut N to these, the first joint part 116 and the second joint part 118 can be connected, thereby improving workability at the construction site. Furthermore, the first main convex portion 120 and the second main convex portion 122 extend in a second direction intersecting the first direction, which is the butt direction of the first joint portion 116 and the second joint portion 118. Similarly, the first sub-concave portion 126 into which the first main convex portion 120 fits and the second sub-concave portion 130 into which the second main convex portion 122 fits extend. Therefore, even if a shear force occurs between the first joint portion 116 and the second joint portion 118, it can be absorbed by the engagement between the first main convex portion 120 and the first sub-concave portion 126 and the engagement between the second main convex portion 122 and the second sub-concave portion 130, and the joint structure 110 can preferably exhibit sufficient durability against the shear force. Therefore, for example, initial slippage between the first joint portion 116 and the second joint portion 118 can be reliably prevented, and the first joint portion 116 and the second joint portion 118 can be more effectively connected. Therefore, rather than requiring a joint structure based on frictional force using high-strength bolts, it is possible to use connecting members such as ordinary bolts B to connect the first joint part 116 and the second joint part 118 at the construction site by transmitting strength against shear forces through the engagement of the convex and concave parts.
[0053] Furthermore, in the joint structure 110, the pipe axis direction, which is the second direction, intersects the circumferential direction, which is the first direction, at a right angle. This configuration allows for more optimal transmission of strength against shear force between the first joint part 116 and the second joint part 118.
[0054] In the second embodiment, the cross-sectional shape of the first main convex portion 120 is generally rectangular, the cross-sectional shape of the second main convex portion 122 is generally rectangular, and the first sub-recess 126 and the second sub-recess 130 have corresponding generally rectangular recesses. However, the first main convex portion 120 may have a first inclined side surface 120a, and the first sub-recess 126 may have a first inclined surface 126a corresponding to the first inclined side surface 120a. Similarly, the second main convex portion 122 may have a second inclined side surface 122a, and the second sub-recess 130 may have a second inclined surface 130a corresponding to the second inclined side surface 122a. Fig. 13 shows a joint JA1 having a joint structure 110A with such inclined side surfaces 120a, 122a, 126a, and 130a. Fig. 13 is an enlarged view corresponding to Fig. 12. The inclined side surfaces 120a, 122a, 126a, and 130a are inclined with respect to the circumferential direction A2 to form tapered inclined surfaces. Therefore, in the modified example of the second embodiment shown in Fig. 13, the fitting structure between the first main convex portion 120 and the first sub-concave portion 126 and the fitting structure between the second main convex portion 122 and the second sub-concave portion 130 are both tapered fitting connection structures.
[0055] In this way, the first main convex portion 120 has the first inclined side surface 120a, the first sub-recess 126 has the first inclined surface 126a corresponding to the first inclined side surface 120a, the second main convex portion 122 has the second inclined side surface 122a, and the second sub-recess 130 has the second inclined surface 130a corresponding to the second inclined side surface 122a, which makes it possible to more appropriately position the first joint part 116 and the second joint part 118. This also makes it possible to more reliably prevent relative displacement between the first joint part 116 and the second joint part 118, for example, initial slippage, and more reliably connect the first joint part 116 and the second joint part 118.
[0056] While typical embodiments of the present disclosure have been described above, the present disclosure is not limited thereto and various modifications are possible. Various substitutions and modifications are possible without departing from the spirit and scope of the present disclosure as defined by the claims of the present application. [Explanation of symbols]
[0057] 1, 1A steel pipe 10, 10A, 110, 110A Joint structure 12, 14 Steel pipe material 16 First joint member (first joint part) 18 Second joint member (second joint part) 116 First joint 118 Second joint 20, 120 1st main convex part 22, 122 2nd main convex part 24, 124 First support member 26, 126 First secondary recess 28, 128 Second support member 30, 130 Second secondary recess 112, 114, 115 Curved plate material
Claims
1. a first joint part and a second joint part that are movable relative to each other and abut against each other in a first direction, the first joint part and the second joint part each having a first main convex part and a second main convex part that extend in a second direction that intersects with the first direction, and the first main convex part of each of the first joint part and the second joint part protruding in a direction opposite to the second main convex part; a first support member that is overlapped on the first main convex portion side of the butted first joint part and the second joint part so as to extend from the first joint part to the second joint part, the first support member having a first sub-concave portion into which the first main convex portion of the first joint part and the second joint part is fitted; a second support member that is overlapped on the second main convex portion sides of the butted first joint part and the second joint part so as to extend from the first joint part to the second joint part, the second support member having a second sub-concave portion into which the second main convex portions of the first joint part and the second joint part fit; a connecting member attached to a hole that penetrates from the first support member to the second support member via one of the first joint portion and the second joint portion; Equipped with Joint structure.
2. the second direction intersects the first direction at a right angle; The joint structure according to claim 1 .
3. the first major convex portion has a first inclined side surface, and the first minor concave portion has a first inclined surface corresponding to the first inclined side surface, the second main convex portion has a second inclined side surface, and the second sub-concave portion has a second inclined surface corresponding to the second inclined side surface; The joint structure according to claim 1 or 2.
4. The first joint portion is provided on a first steel pipe material, and the second joint portion is provided on a second steel pipe material, The first direction is the axial direction of each of the first steel pipe and the second steel pipe. The joint structure according to claim 1 or 2.
5. The first joint portion is provided on a first curved plate material, and the second joint portion is provided on a second curved plate material. The joint structure according to claim 1 or 2.
Citation Information
Patent Citations
Cast-in-place steel pipe concrete pile and its construction method
JP2008202218A