JP7603410B2 - Steel Pipe Fittings - Google Patents

Description

The present invention relates to steel pipe joints.

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 the joint structure of a steel pipe using this. 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 connecting plate part are extended to the opposite side of the steel pipe side, with the extension 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.

Patent Document 2 discloses technology related to steel pipe joints 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 surface of the facing end faces of these joint pipes, a joint block that fits into 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 an internal elastic body 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.

Patent Document 3 discloses technology related to joint structures when steel pipes are used as pillar materials. In this prior art, flange bodies are attached in advance to the ends of the upper and lower pipe bodies to be connected, forming a narrow-diameter section at the tip with a flange whose outer diameter is smaller than that of the pipe bodies. The flange of the upper pipe body is then placed on the flange of the lower pipe body, and a cylindrical body with inner flanges on the top and bottom is sandwiched between a pair of half metal fittings that are split into two from the outside of the upper and lower flanges, and a sleeve is fitted onto the outside of the half metal fittings and tightened inward.

Patent No. 3308395 JP 2009-256968 A Japanese Patent Application Publication No. 8-144384

As in Patent Document 1, the outside of the joint member that transmits the 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 standpoint of design.

The purpose of the present invention is to narrow the area in which a joint is formed along the axial direction of the cover member of a steel pipe joint that connects steel pipes together.

The first aspect is a steel pipe joint comprising: a stress transfer member, the axial ends of which are joined to a pair of steel pipes, and the maximum width of a cross section perpendicular to the axial direction is smaller than the outer shape of the steel pipes; and a cylindrical cover member, the outer shape of which is the same or substantially the same as that of the steel pipes, which covers the stress transfer member. The cover member is a first cover part that has an opening formed along the axial direction through which the stress transfer member can be inserted, and a first and second cover part that constitute the cylindrical cover member together with the first cover part, the outer shape of the cross section perpendicular to the axial direction is smaller than that of the first cover part, and that closes the opening.

In the steel pipe joint of the first embodiment, the cover member has a first cover part with an opening formed along the axial direction into which a stress transmission member can be inserted, 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.

The second aspect is the steel pipe joint described in the first aspect, in which the width of the opening of the first cover part 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.

In the second embodiment of the steel pipe joint, 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. Therefore, the range of the joint formed 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 greater than the maximum width as viewed from a direction perpendicular to the axial direction of the stress transmission member.

The third aspect is the steel pipe joint according to the first or second aspect, in which the cover member has a connection 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 disposed outside the connection plate and is bolted to the connection plate.

In the third embodiment of the steel pipe joint, the second cover portion is bolted to the connection plate. This improves workability and maintainability compared to when the second cover portion is welded.

According to the present invention, the area of the joint formed along the axial direction of the cover member of the 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.

(A) is a perspective view of the canopy, and (B) is a front view. FIG. 2 is an exploded perspective view of steel pipes that constitute a skeletal member joined together with steel pipe joints. 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. 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 . 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, the joint portion being in the state shown in FIG. 4 with a cover member provided thereon. 11A to 11C are process diagrams showing a process of attaching a first cover portion of a cover member to a joint body formed by joining steel pipes together. 10A to 10C are process diagrams showing a 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, (D) is a view of (B) from a direction perpendicular to the axial direction, and (E) is a view of (C) from a direction perpendicular to the axial direction. 7A is an enlarged view of 7A in FIG. 7A, and FIG. 7B is an enlarged view of 7B in FIG.

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

As shown in FIG. 1, the canopy 20 is provided to cover the road 10. The canopy 20 is composed of a plurality of skeletal members 30 provided at intervals, and a curtain member (not shown) stretched across the plurality of skeletal members 30. The skeletal members 30 are curved in an arc. The skeletal members 30 are also composed of a plurality of steel pipes 40 connected by the steel pipe joints 100 of this embodiment (see FIG. 2).

The steel pipe 40 of this embodiment is a plated steel pipe whose outer 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. Note that the structures of the framework member 30 and the steel pipe 40 are not limited to these.

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 the bifurcation point of the curvature. However, the connection portion 32 is not limited to such a position.

As shown in FIG. 2, the steel pipe joint 100 is composed of a stress transmission member 110 and a cover member 180.

2 and 3, the stress transfer 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 the 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 the welded portion unclear or difficult to see, but this is not limited to this.

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.

The maximum width H3 (see FIG. 6A) 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 cylindrical 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 cover member 180 has an outer shape that is the same or approximately the same as the outer shape of the steel pipe 40.

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

As shown in FIG. 6A, the opening width H1 of the slit-shaped opening 184 of the first cover portion 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 transfer member 110. In other words, the relationship is H3>H1>H2.

As shown in Figures 5, 7, and 8, the connecting plate 190 is bolted to the edge 184A of the opening 184 on the inner surface of the first cover part 182 with a flat head bolt 192. As shown in Figures 5, 7(B), 7(C), and 8, the 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.

As shown in FIG. 8, a weld nut 194 for fastening the flat head bolt 192 is attached to the inner surface of the connection plate 190. 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.

A pair of fixing plate parts 188 is provided at each axial end 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.

Here, as shown in FIG. 7(B), the outer shape of the first cover part 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 part 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 part 182 and the second cover part 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°.

Also, as shown in FIG. 1, the joint 181 and the area in which the joint 181 is formed are positioned so as to be located on the opposite side to the road 10.

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

First, as shown in Figures 2 and 3, the end 112A of the joint body 112 of the stress transfer member 110 constituting the steel pipe joint 100 is inserted into the steel pipe 40 and welded.

As shown in Figures 2, 3, and 4, the tip portions 112B of the two joint bodies 112 are butted against each other and clamped between joint plates 116 from both sides of the plate portion 114 and bolted together.

As shown in Figures 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 the part with the smallest width H2 when viewed from a direction perpendicular to the axial direction.

As shown in Figure 6 (C), after insertion, rotate the first cover part 182 about its axis by approximately 30°.

As shown in Figures 7(A) and 8(A), the connecting plate 190 is bolted to the edge 184A of the opening 184 on the inner surface of the first cover part 182 using a countersunk bolt 192.

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 countersunk bolt 192.

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

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

The steel pipe joint 100 has a cylindrical cover member 180 and a first cover part 182 with an opening 184 formed along the axial direction into which the stress transfer member 110 can be inserted, and the opening 184 of the first cover part 182 is blocked by a second cover part 186. 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.

In this embodiment, the outer shape of the first cover part 182 in a cross section perpendicular to the axial direction of the cover member 180 is approximately a 3/4 arc, and the outer shape of the second cover part 186 is approximately a 1/4 arc. Therefore, the distance between the joints 181 along the axial direction of the first cover part 182 and the second cover part 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°.

The area where the seam 181 is formed is positioned so that it is 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, which provides excellent design.

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

In contrast, in this embodiment, as described above, the area in which the seam 181 is formed is positioned 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, which provides excellent design.

In addition, 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 when 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.

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 transfer member 110 in a direction perpendicular to the axial direction. And, if the connection part 32 between the steel pipes 40 is horizontal or approximately horizontal, the opening 184 of the first cover part 182 after rotation is set to face upward, thereby preventing the first cover part 182 from falling off.

The first cover part 182 and the second cover part 186 are each bolted to the connecting plate 190 to be integrated. This improves workability and maintainability compared to when the first cover part 182 and the second cover part 186 are welded.

When attaching the second cover part 186, the gap in the fixing plate part 188 is inserted into the shaft end part of the joint body 112, so that the cover member 180 is positioned and prevented from rotating.

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

For example, in this embodiment, the outer shape of the 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 part 182 and a 1/4 arc for the second cover part 186, but is not limited to this. For example, the first cover part 182 may be a 2/3 arc and the second cover part 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 part 182 and the second cover part 186.

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

For example, the steel pipe joint 100 of this embodiment is used to connect the steel pipes 40 of the skeletal members 30 that are curved in a roughly semicircular shape and 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. Furthermore, the steel pipe is not limited to being cylindrical. The steel pipe may be a square tube. If the steel pipe is a square tube, the cover member is also a square tube.

In addition, the stress transmission member 110 in the above embodiment is configured such that the tip portions 12B of the two joint bodies 112 are butted against each other and are then clamped by the joint plates 116 from both sides of the plate portion 114 and bolted together, but is not limited to this. Any structure that can connect steel pipes and transmit stress may be used. For example, the stress transmission member may be configured not to be divided into two parts.

Furthermore, the present invention can be implemented in various ways without departing from the spirit of the invention.

40 Steel pipe 100 Steel pipe joint 110 Stress transmission member 112 Joint body 180 Cover member 181 Joint 182 First cover part 184 Opening 186 Second cover part 188 Fixing plate part 190 Connection plate H1 Opening width H2 Minimum width H3 Maximum width

Claims (5)

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. 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 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. 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, 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. 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 . 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.
A steel pipe joint according to claim 3 or claim 4 .