Steel Pipe Fittings

Abstract

To narrow a formation range of a seam along an axial direction of a cover member of a steel pipe joint for connecting steel pipes.SOLUTION: A steel pipe joint 100 includes: a stress transmission member 110 in which both ends in an axial direction are respectively joined to a pair of steel pipes 40, and a maximum width of a cross section orthogonal to the axial direction is smaller than an external size of the steel pipe 40; and a cylindrical cover member 180 which has the same or almost the same external size with the steel pipe 40, and covers the stress transmission member 110. The cover member 180 includes: a first cover 182 which has an opening 184 formed along the axial direction so that the stress transmission member 110 can be inserted therethrough; and a second cover 186 which forms the cylindrical cover member 180 with the first cover 182, and has an external size of a cross section orthogonal to the axial direction smaller than the first cover 182, and closes the opening 184.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a steel pipe joint. [Background technology]

[0002] Patent Document 1 discloses a steel pipe joint used in the framework of a power transmission tower or a steel pipe structure, and a technology relating to a joint structure of a steel pipe using the same. In this prior art, the steel pipe joint has a substantially circular base part, one side of which is welded to the end of the steel pipe. A connecting cylinder is concentrically connected to the center of this base via a radial connecting plate part, and the connecting cylinder and the connecting plate part are extended to the opposite side to the steel pipe side, with the extended part of the connecting plate part forming the joint part. In addition, a cylindrical cover member that covers the joint part and the joint plate is attached between the base parts.

[0003] Patent Document 2 discloses a technology related to a steel pipe joint used when connecting the ends of steel pipes such as steel pipe piles without welding. This prior art includes joint pipes facing each other from above and below, a connecting plate joined to the inner peripheral surfaces of the facing end faces of these joint pipes, a joint block that is fitted and engaged with a fitting hole provided in the connecting plate, and an intermediate plate joined to the joint block. Through holes are provided in the upper and lower parts of the joint block, and engaging pins that are biased outward by internal elastic bodies are inserted into both ends of each through hole, and each engaging pin is held in a recessed state by a stopper frame attached around the joint block.

[0004] Patent Document 3 discloses a technology related to a joint structure when steel pipes are used as pillar materials. In this prior art, a flange body is attached in advance to the ends of the upper and lower pipe bodies to be connected, forming a narrow-diameter portion at the tip of the flange whose outer diameter is smaller than that of the pipe bodies. Then, the flange of the upper pipe body is placed on the flange of the lower pipe body, and a cylindrical body having inner flanges on the top and bottom is sandwiched between a pair of half metal fittings having a shape divided into two from the outside of the upper and lower flanges, and a sleeve is fitted to the outside of the half metal fittings and tightened inward. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3308395 [Patent Document 2] JP 2009-256968 A [Patent Document 3] Japanese Patent Application Publication No. 8-144384 Summary of the Invention [Problem to be solved by the invention]

[0006] As in Patent Document 1, the outside of a joint member that transmits a load in a steel pipe joint may be covered with a cylindrical cover member. If this cylindrical cover member has a split structure, a joint is formed along the axial direction. In the case of a split structure, the joints along the axial direction are spaced apart at approximately 180° from each other. Therefore, the joints along the axial direction of the cover member are always formed within a range of approximately 180°, so the joints are visible from any direction around the axis. Therefore, there is room for improvement from the viewpoint of design.

[0007] An object of the present invention is to narrow the area in which a joint is formed along the axial direction of a cover member of a steel pipe joint that connects steel pipes together. [Means for solving the problem]

[0008] The first aspect is a steel pipe joint comprising: a stress transfer member whose both axial ends are respectively joined to a pair of steel pipes and whose maximum width in a cross section perpendicular to the axial direction is smaller than the outer shape of the steel pipes; and a tubular cover member which has the same or approximately the same outer shape as the steel pipes and covers the stress transfer member, wherein the cover member is a first cover portion which has an opening formed along the axial direction through which the stress transfer member can be inserted, and a first and second cover portion which together form the tubular cover member and have an outer shape perpendicular to the axial direction that is smaller than that of the first cover portion and which closes the opening.

[0009] In the steel pipe joint of the first embodiment, the cover member has a first cover part in which an opening into which a stress transmission member can be inserted is formed along the axial direction, and the opening of the first cover part is blocked by the second cover part. The second cover part has a smaller outer shape in a cross section perpendicular to the axial direction than the first cover part. Therefore, when the outer shapes of the first cover part and the second cover part are the same, the formation range of the joint along the axial direction between the first cover part and the second cover part constituting the cover member of the steel pipe joint that connects steel pipes together is narrower than in the case of a so-called split structure.

[0010] A second aspect is the steel pipe joint according to the first aspect, in which the width of the opening of the first cover portion is smaller than the maximum width and larger than the minimum width when viewed in a direction perpendicular to the axial direction of the stress transmission member.

[0011] In the steel pipe joint of the second embodiment, the width of the opening of the first cover part is smaller than the maximum width as viewed from a direction perpendicular to the axial direction of the stress transmission member, and therefore the formation range of the joint along the axial direction of the cover member between the first and second cover parts in the cover member is narrower than when the width of the opening is equal to or larger than the maximum width as viewed from a direction perpendicular to the axial direction of the stress transmission member.

[0012] A third aspect is a steel pipe joint as described in the first or second aspect, in which the cover member has a connecting plate joined to the edge of the opening on the inner surface of the first cover part and extending into the opening, and the second cover part is arranged on the outside of the connecting plate and is bolted to the connecting plate.

[0013] In the steel pipe joint of the third aspect, the second cover portion is fastened to the connecting plate by bolts, which improves workability and maintainability compared to when the second cover portion is welded. Effect of the Invention

[0014] According to the present invention, the area over which a joint is formed along the axial direction of the cover member of a steel pipe joint that connects steel pipes can be narrowed compared to when the first cover part and the second cover part have the same external shape. [Brief description of the drawings]

[0015] [Figure 1] (A) is a perspective view of the canopy, and (B) is a front view. [Diagram 2] FIG. 2 is an exploded perspective view of steel pipes that constitute a skeletal member joined together with steel pipe joints. [Diagram 3] FIG. 2 is a perspective view of a state in which a joint body constituting a steel pipe joint is joined to a steel pipe. [Figure 4] FIG. 4 is a perspective view of the joint bodies fastened together by bolts using a joint plate from the state shown in FIG. 3. [Diagram 5] FIG. 5 is a perspective view of a joint portion of a framework member in which steel pipes are joined by a steel pipe joint, showing a state in which a cover member is provided in the state shown in FIG. 4. [Figure 6] 6(A) to 6(C) are process drawings showing the process of attaching a first cover portion of a cover member to a joint body in which steel pipes are joined together. [Figure 7] 13A to 13C are process diagrams showing the process of attaching a first cover portion of a cover member to a joint body formed by joining steel pipes together, and then attaching a second cover portion, where 13D is a view of 13B from a direction perpendicular to the axial direction, and 13E is a view of 13C from a direction perpendicular to the axial direction. [Figure 8] (A) is an enlarged view of 7A in FIG. 7(A), and (B) is an enlarged view of 7B in FIG. 7(B). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] <Embodiment> A steel pipe joint according to one embodiment of the present invention will be described.

[0017] As shown in Fig. 1, the canopy 20 is provided so as to cover the road 10. The canopy 20 is composed of a plurality of skeletal members 30 provided at intervals, and curtain members (not shown) stretched across the plurality of skeletal members 30. The skeletal members 30 are curved in an arc. The skeletal members 30 are formed by connecting a plurality of steel pipes 40 with the steel pipe joints 100 of this embodiment (see Fig. 2).

[0018] The steel pipe 40 of this embodiment is a plated steel pipe whose outer circumferential surface is plated, and the outer shape of the cross section perpendicular to the axial direction is circular. In other words, the steel pipe 40 of this embodiment is cylindrical. However, the structures of the framework member 30 and the steel pipe 40 are not limited to these.

[0019] In this embodiment, the connection portion 32 where the steel pipes 40 are connected to each other with the steel pipe joint 100 (see FIG. 2) is a portion of the framework member 30 where the required design strength is low. Specifically, the connection portion 32 is located at or near a branch point of the curvature. However, the connection portion 32 is not limited to such a position.

[0020] As shown in FIG. 2, the steel pipe joint 100 is configured to include a stress transmission member 110 and a cover member 180.

[0021] 2 and 3, the stress transmission member 110 has two joint bodies 112. The joint body 112 is configured by joining plate portions 114 in a cross-shaped cross section (see also FIG. 5(A) and the like). The joint body 112 is integrated with the steel pipe 40 by inserting an end portion 112A into a slit (not shown) formed in the steel pipe 40 and welding it. In this embodiment, the end portion 112A of the joint body 112 and the steel pipe 40 are welded and then surface-finished, making it difficult to see the welded portion, but this is not limited to this.

[0022] As shown in Figures 2, 3 and 4, the tip portions 112B of the two joint bodies 112 are butted against each other, sandwiched between joint plates 116 from both sides of the plate portion 114, and bolted together to form a stress transmission member 110.

[0023] The maximum width H3 (see FIG. 6(A)) of the cross section perpendicular to the axial direction of the stress transfer member 110 is smaller than the outer shape of the steel pipe 40. As shown in FIGS. 2 and 5, the cover member 180 is a tubular member that covers the outside of the portion of the stress transfer member 110 (see FIGS. 2, 3 and 4) that is exposed from the steel pipe 40. The outer shape of the cover member 180 is the same or approximately the same as the outer shape of the steel pipe 40.

[0024] The cover member 180 is configured to include a first cover portion 182, a second cover portion 186, and a connection plate 190 (see FIG. 8, etc.). The first cover portion 182 has a slit-shaped opening 184 formed along the axial direction. In this embodiment, the outer shape of the first cover portion 182 is approximately a 3 / 4 arc, and the outer shape of the second cover portion 186 is approximately a 1 / 4 arc.

[0025] 6(A), the opening width H1 of the slit-shaped opening 184 of the first cover part 182 is smaller than the maximum width H3 and larger than the minimum width H2 when viewed from a direction perpendicular to the axial direction of the stress transmission member 110. In other words, the relationship is H3>H1>H2.

[0026] 5, 7, and 8, the connecting plate 190 is bolted to an edge 184A of the opening 184 on the inner surface of the first cover part 182 by a flat head bolt 192. Then, as shown in FIGS. 5, 7(B), 7(C), and 8, an edge 186A of the second cover part 186 is bolted to the flat head bolt 192, thereby closing the opening 184 of the first cover part 182.

[0027] 8, a weld nut 194 for fastening the flat head bolt 192 is joined to the inner surface of the connection plate 190. An adhesive is applied to the flat head bolt 192 to prevent loosening, and a washer 196 is sandwiched between the weld nut 194 and the connection plate 190.

[0028] Further, a pair of fixing plate parts 188 is provided at each axial end part of the second cover part 186 (see FIG. 7). The gap between the pair of fixing plate parts 188 is inserted into the axial end part to which the connecting plate 190 of the plate part 114 of the joint body 112 is not bolted.

[0029] Here, as shown in Fig. 7(B), the outer shape of the first cover portion 182 in a cross section perpendicular to the axial direction in the cover member 180 of this embodiment is approximately a 3 / 4 arc, and the outer shape of the second cover portion 186 is approximately a 1 / 4 arc. Therefore, as shown in Fig. 7(C), the distance between the joints 181 along the axial direction of the first cover portion 182 and the second cover portion 186 in the cover member 180 of the steel pipe joint 100 is 1 / 4 arc, and the angle around the axis is 90°. In other words, the range where the joints 181 are not formed is 3 / 4 arc, and the angle around the axis is 270°.

[0030] As shown in FIG. 1, the joint 181 and the area in which the joint 181 is formed are disposed so as to be located on the opposite side to the road 10 side.

[0031] (Construction method) Next, a construction method for joining steel pipes 40 together using the steel pipe joint 100 will be described.

[0032] First, as shown in Figs. 2 and 3, an end portion 112A of a joint body 112 of a stress transmission member 110 constituting a steel pipe joint 100 is inserted into a steel pipe 40 and welded.

[0033] As shown in FIGS. 2, 3 and 4, the tip portions 112B of the two joint bodies 112 are butted against each other, and are sandwiched between joint plates 116 from both sides of the plate portion 114 and fastened with bolts.

[0034] 6(A) and 6(B), the stress transfer member 110 is inserted from the opening 184 of the first cover part 182. At this time, the stress transfer member 110 is inserted from a portion having a minimum width H2 when viewed from a direction perpendicular to the axial direction.

[0035] As shown in FIG. 6(C), after the insertion, the first cover portion 182 is rotated about its axis by approximately 30 degrees.

[0036] As shown in FIGS. 7(A) and 8(A), a connecting plate 190 is bolted to an edge 184A of the opening 184 on the inner surface of the first cover portion 182 by means of a countersunk bolt 192.

[0037] As shown in Figures 7(B), 7(C), and 8(B), the second cover part 186 is attached to cover the opening 184 of the first cover part 182, and the edge part 186A is bolted to the connecting plate 190 by a flat head bolt 192.

[0038] As shown in Figs. 7(D) and 7(E), when attaching the second cover portion 186, the shaft end portion of the joint body 112 is inserted into the gap of the fixing plate portion 188.

[0039] <Action and Effects> Next, the operation and effects of this embodiment will be described.

[0040] In the steel pipe joint 100, a cylindrical cover member 180 has a first cover part 182 in which an opening 184 into which the stress transmission member 110 can be inserted is formed along the axial direction, and a second cover part 186 closes the opening 184 of the first cover part 182. The second cover part 186 has a smaller outer shape in a cross section perpendicular to the axial direction than the first cover part 182. Therefore, compared to a case in which the outer shapes of the first cover part and the second cover part are the same, the joint 181 between the first cover part 182 and the second cover part 186 along the axial direction of the cover member 180 in the steel pipe joint 100 and the formation range of the joint 181 are narrower.

[0041] In the cover member 180 of this embodiment, the outer shape of the first cover portion 182 in a cross section perpendicular to the axial direction is approximately a 3 / 4 arc, and the outer shape of the second cover portion 186 is approximately a 1 / 4 arc. Therefore, the distance between the joints 181 along the axial direction of the first cover portion 182 and the second cover portion 186 in the cover member 180 of the steel pipe joint 100 is 1 / 4 arc, and the angle around the axis is 90°. In other words, the range between the joints 181 where the joints 181 are not formed is 3 / 4 arc, and the angle around the axis is 270°.

[0042] The area where the joint 181 is formed is disposed so as to be located on the opposite side to the road 10. Therefore, it is invisible or almost invisible to people on the road 10 under the canopy 20, and has excellent design.

[0043] Here, in the comparative example where the cover member is split in half and the first cover part and the second cover part have the same external shape, the distance between the joints is 180°, and no matter how the joints are positioned, the joints will always be visible to people on the road below the canopy.

[0044] In contrast to this, in this embodiment, as described above, the area where the seam 181 is formed is disposed so as to be located on the opposite side to the road 10. Therefore, it is invisible or almost invisible to people on the road 10 under the canopy 20, and therefore has excellent design.

[0045] Furthermore, the opening width H1 of the opening 184 along the axial direction of the first cover portion 182 is smaller than the maximum width H3 and larger than the minimum width H2 as viewed from a direction perpendicular to the axial direction of the stress transfer member 110. Therefore, the formation range of the seam 181 along the axial direction of the cover member 180 between the first cover portion 182 and the second cover portion 186 is narrower than when the opening width H1 of the opening 184 is equal to or larger than the maximum width H3.

[0046] Furthermore, by rotating the first cover part 182 about its axis by approximately 30° after insertion, the first cover part 182 after rotation will not come off the stress transmission member 110 in a direction perpendicular to the axial direction. When the connection parts 32 between the steel pipes 40 are horizontal or approximately horizontal, the openings 184 of the first cover part 182 after rotation are set to face upward, thereby preventing the first cover part 182 from falling off.

[0047] Moreover, the first cover portion 182 and the second cover portion 186 are integrated by being bolted to the connecting plate 190. Therefore, compared to a case in which the first cover portion 182 and the second cover portion 186 are welded, workability and maintainability are improved.

[0048] Furthermore, when the second cover portion 186 is attached, the shaft end portion of the joint body 112 is inserted into the gap of the fixing plate portion 188, so that the cover member 180 is positioned and prevented from rotating.

[0049] <Other> The present invention is not limited to the above embodiment.

[0050] For example, in the present embodiment, the outer shape of a cross section perpendicular to the axial direction constituting the cover member 180 of the steel pipe joint 100 is a 3 / 4 arc for the first cover portion 182 and a 1 / 4 arc for the second cover portion 186, but is not limited to this. For example, the first cover portion 182 may be a 2 / 3 arc and the second cover portion 186 may be a 1 / 3 arc. In short, it is sufficient that the cover member 180 is split in half and the outer shape of the cross section perpendicular to the axial direction is not the same for the first cover portion 182 and the second cover portion 186.

[0051] For example, in the present embodiment, the connecting plate 190 is bolted to the edge portion 18A of the opening 184 of the first cover portion 182, but is not limited to this. For example, the connecting plate 190 may be welded to the edge portion 184A of the first cover portion 182. Furthermore, the second cover portion 186 may also be joined by a method other than bolting, for example, by welding.

[0052] Also, for example, the steel pipe joint 100 of this embodiment is used to connect the steel pipes 40 of the skeleton members 30 curved in a substantially semicircular shape that constitute the canopy 20, but is not limited to this. For example, the steel pipe joint 100 of this embodiment may be used to connect the steel pipes that constitute a straight structural member. Also, the steel pipe is not limited to a cylinder. The steel pipe may be a square tube. When the steel pipe is a square tube, the cover member is also a square tube.

[0053] In addition, the stress transmission member 110 in the above embodiment has a configuration in which the tip portions 12B of the two joint bodies 112 are butted against each other and sandwiched between the joint plates 116 from both sides of the plate portion 114 and bolted together, but is not limited to this. Any structure may be used as long as it is capable of connecting steel pipes and transmitting stress. For example, the stress transmission member may have a configuration that is not divided into two parts.

[0054] Furthermore, the present invention can be embodied in various forms without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0055] 40 Steel pipe 100 Steel pipe fittings 110 Stress transmission member 112 Fitting body 180 Cover material 181 Seam 182 First cover part 184 Opening 186 Second cover part 188 Fixed plate part 190 Connection plate H1 opening width H2 minimum width H3 maximum width

Claims

1. A stress transmission member having both axial ends joined to a pair of steel pipes, and a maximum width of a cross section perpendicular to the axial direction being smaller than the outer dimensions of the steel pipes; A cylindrical cover member having an outer shape identical or substantially identical to that of the steel pipe and covering the stress transmission member; having The cover member is a first cover portion having an opening formed along an axial direction and into which the stress transmission member can be inserted; a second cover portion that configures the cover member in a cylindrical shape together with the first cover portion, has an outer shape in a cross section perpendicular to an axial direction smaller than that of the first cover portion, and closes the opening; Preparation, The width of the opening of the first cover portion is smaller than the maximum width and larger than the minimum width when viewed in a direction perpendicular to the axial direction of the stress transmission member. Steel pipe fittings.

2. A stress transmission member having both axial ends joined to a pair of steel pipes, and a maximum width of a cross section perpendicular to the axial direction being smaller than the outer diameter of the steel pipes; A cylindrical cover member having an outer shape identical or substantially identical to that of the steel pipe and covering the stress transmission member; having The cover member is a first cover portion having an opening formed along an axial direction and into which the stress transmission member can be inserted; a second cover portion that configures the cover member in a cylindrical shape together with the first cover portion, has an outer shape in a cross section perpendicular to an axial direction smaller than that of the first cover portion, and closes the opening; Preparation, The cover member has a connection plate joined to an edge portion of the opening on an inner surface of the first cover portion and extending into the opening, The second cover portion is disposed on the outer side of the connecting plate and is bolted to the connecting plate. Steel pipe fittings.

3. A stress transmission member having both axial ends joined to a pair of steel pipes, the maximum width of a cross section perpendicular to the axial direction being smaller than the outer diameter of the steel pipes; A cylindrical cover member having an outer shape identical or substantially identical to that of the steel pipe, an end of which is abutted against the end of the steel pipe, and which covers the entire portion of the stress transmission member exposed from the steel pipe; having The cover member is a first cover portion having an opening formed along an axial direction and into which the stress transmission member can be inserted; a second cover portion that configures the cover member in a cylindrical shape together with the first cover portion, has an outer shape in a cross section perpendicular to an axial direction smaller than that of the first cover portion, and closes the opening; Preparation, The steel pipe and the cover member are cylindrical, The cylindrical steel pipe constitutes a framework member of a canopy that is provided to cover a road, The cylindrical cover member has an axis between the first cover portion and the second cover portion on a circumferential surface. The area where the distance between the two joints along the direction is narrower is provided so as to be located on the opposite side to the road. Steel pipe fittings.

4. The width of the opening of the first cover portion is smaller than the maximum width and larger than the minimum width when viewed in a direction perpendicular to the axial direction of the stress transmission member, A steel pipe joint according to claim 3.

5. The cover member has a connecting plate joined to an edge of the opening on an inner surface of the first cover portion and extending into the opening, The second cover portion is disposed on the outer side of the connecting plate and is bolted to the connecting plate. A steel pipe joint according to claim 3 or claim 4.

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