Joint protection member, junction structure and attachment method for joint protection member

Abstract

To provide a configuration that can improve the ease of installation and removal in a joint protection member that is attached to an outer peripheral surface of a cylindrical pin joint connected to the longitudinal end of a steel pipe.SOLUTION: A joint protection member 4 has multiple divided bodies 5 that are connected in a circumferentially aligned state, and a fitting part 43 that is formed on an inner circumferential surface 41 and can fit into a groove part or a protrusion part that extends circumferentially on an outer circumferential surface of a pin joint part 3. Each of the divided bodies 5 has a divided fitting part 53 on an inner circumferential surface 52 that constitutes a part of the fitting part 43.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a joint protection member that is attached to the outer peripheral surface of a cylindrical pin joint portion connected to the longitudinal end of a steel pipe to protect the pin joint portion, a joining structure having the pin joint portion and the joint protection member, and a method for attaching the joint protection member.

Background Art

[0002] A joining structure is known in which a pin joint portion connected to the longitudinal end of a steel pipe and a joint protection member disposed on the outer peripheral surface of the pin joint portion are joined. As such a joining structure, for example, Patent Document 1 discloses a joining structure in which a shaft-shaped joint portion welded and fixed to the upper end of a steel pipe and a cylindrical joint portion externally fitted to the shaft-shaped joint portion are joined by inserting a key that can be inserted and removed so as to span an axial key groove provided in the shaft-shaped joint portion and a cylindrical key groove provided in the cylindrical joint portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, generally, a joint protection member that protects the outer peripheral surface of a cylindrical pin joint portion is cylindrical. Therefore, when attaching the joint protection member to the pin joint portion, it is necessary to align the axis of the joint protection member with the axis of the pin joint portion. Thus, generally, when attaching a joint protection member to a pin joint portion, an operation of aligning their axes is required.

[0005] In addition, in a structure in which a pin joint part and a joint protection member are connected in the radial direction by inserting a key into a key groove as in the joint structure of Patent Document 1, before inserting the key, it is necessary to radially align the circumferential position of the key groove of the pin joint part and the circumferential position of the key groove of the joint protection member.

[0006] An object of the present invention is to provide a configuration capable of improving the workability of attachment and detachment work in a joint protection member attached to the outer peripheral surface of a cylindrical pin joint part connected to the longitudinal end of a steel pipe.

Means for Solving the Problems

[0007] A joint protection member according to an embodiment of the present invention is a cylindrical joint protection member attached to the outer peripheral surface of a cylindrical pin joint part connected to the longitudinal end of a steel pipe. This joint protection member has a plurality of divided bodies connected in a circumferentially arranged state, and a fitting portion formed on the inner peripheral surface and capable of fitting with a groove portion or a protrusion portion extending in the circumferential direction on the outer peripheral surface of the pin joint part. Each of the plurality of divided bodies has a divided fitting portion on the inner peripheral surface, which constitutes a part of the fitting portion (first configuration).

[0008] Thereby, the divided fitting portions of the plurality of divided bodies can be fitted to the groove portion or the protrusion portion of the pin joint part from the radially outer side. Therefore, the joint protection member can be easily attached to the pin joint part. In addition, compared with a configuration in which the joint protection member is attached to the pin joint part from the axial direction with the axis of the joint protection member aligned with the axis of the pin joint part, the workability of attachment and detachment work can be improved. Therefore, a joint protection member capable of improving the workability of attachment and detachment work can be provided.

[0009] In the first configuration, the plurality of divided bodies each have a connecting portion at one end in the circumferential direction and the other end in the circumferential direction. Among the plurality of divided bodies, the divided bodies adjacent in the circumferential direction are connected to each other by the connecting portions adjacent in the circumferential direction, and are thus connected in the circumferential direction (second configuration).

[0010] Accordingly, it is possible to provide a configuration in which a plurality of divided bodies can be connected in the circumferential direction while being arranged on the outer peripheral surface of the pin joint portion. Therefore, the workability of the operation of attaching and detaching the joint protection member to and from the pin joint portion can be improved.

[0011] In the second configuration, the joint protection member further has a connecting member that penetrates the connecting portions adjacent to each other in the circumferential direction and connects the divided bodies adjacent to each other in the circumferential direction (third configuration).

[0012] Accordingly, a plurality of divided bodies can be easily connected in the circumferential direction. Therefore, the workability of the operation of attaching and detaching the joint protection member to and from the pin joint portion can be improved.

[0013] In the second configuration, the joint protection member further has a connecting member having a shaft portion extending in the circumferential direction and a locking portion extending in the axial direction of the joint protection member from the shaft portion. One of the connecting portions adjacent to each other in the circumferential direction extends in the circumferential direction and has a first circumferential groove portion in which one end portion in the longitudinal direction of the shaft portion in the connecting member is accommodated, and a fixing portion that fixes the one end portion in the longitudinal direction of the shaft portion in the first circumferential groove portion. The other of the connecting portions adjacent to each other in the circumferential direction extends in the circumferential direction and has a second circumferential groove portion in which the remaining portion of the shaft portion of the connecting member is accommodated, and an axial groove portion extending in the axial direction of the joint protection member from the second circumferential groove portion and accommodating the locking portion. The divided bodies adjacent to each other in the circumferential direction are connected in the circumferential direction by the connecting member disposed across the grooves adjacent to each other in the circumferential direction (fourth configuration).

[0014] Accordingly, it is possible to provide a configuration in which a plurality of divided bodies can be easily connected in the circumferential direction. Therefore, the workability of the operation of attaching and detaching the joint protection member to and from the pin joint portion can be improved.

[0015] In the second configuration, the joint protection member further includes a connecting member having a shaft portion extending in the circumferential direction and a pair of locking portions extending in the axial direction of the joint protection member from positions spaced apart from each other in the longitudinal direction of the shaft portion. One of the connection portions adjacent to each other in the circumferential direction includes a circumferential groove portion extending in the circumferential direction and accommodating a part of the shaft portion of the connecting member, and an axial groove portion extending in the axial direction of the joint protection member from the circumferential groove portion and accommodating one of the pair of locking portions extending in the axial direction from a part of the shaft portion. The other of the connection portions adjacent to each other in the circumferential direction includes a circumferential groove portion extending in the circumferential direction and accommodating the remaining portion of the shaft portion of the connecting member, and an axial groove portion extending in the axial direction of the joint protection member from the circumferential groove portion and accommodating the other of the pair of locking portions extending in the axial direction from the remaining portion of the shaft portion. The divided bodies adjacent to each other in the circumferential direction are circumferentially connected by the connecting member disposed across the grooves adjacent to each other in the circumferential direction (fifth configuration).

[0016] In this configuration, one of the pair of locking portions extending in the axial direction of the joint protection member in the connecting member is accommodated in one of the axial groove portions of the divided bodies adjacent to each other in the circumferential direction. The other of the pair of locking portions extending in the axial direction in the connecting member is accommodated in the other axial groove portion of the divided bodies adjacent to each other in the circumferential direction. Therefore, one of the divided bodies having the axial groove portion in which one of the pair of locking portions is accommodated cannot move in the circumferential direction with respect to the one locking portion. Also, the other of the divided bodies having the axial groove portion in which the other of the pair of locking portions is accommodated cannot move in the circumferential direction with respect to the other locking portion. Thus, a configuration that can easily and more reliably connect the divided bodies adjacent to each other in the circumferential direction can be realized.

[0017] In any one of the first to fifth configurations, the pin joint portion has a groove portion extending in the circumferential direction on the outer peripheral surface. The fitting portion is a protrusion extending in the circumferential direction that can be fitted to the groove portion of the pin joint portion. Each of the plurality of divided bodies has a divided protrusion on the inner peripheral surface that constitutes a part of the protrusion (sixth configuration).

[0018] As a result, a protrusion extending in the circumferential direction on the inner peripheral surface of the joint protection member can be fitted into a groove portion extending in the circumferential direction on the outer peripheral surface of the pin joint portion. Thereby, a configuration in which the joint protection member can be easily attached onto the outer peripheral surface of the pin joint portion can be provided.

[0019] A joining structure according to an embodiment of the present invention is a joining structure including a cylindrical pin joint portion connected to an end portion in the longitudinal direction of a steel pipe, and a cylindrical joint protection member attached onto the outer peripheral surface of the pin joint portion. The pin joint portion has a fitting portion to be fitted, which is a groove portion or a protrusion extending in the circumferential direction, on the outer peripheral surface. The joint protection member includes a plurality of divided bodies connected in a state of being arranged in the circumferential direction, and a fitting portion formed on the inner peripheral surface and capable of being fitted to the fitting portion to be fitted of the pin joint portion. Each of the plurality of divided bodies has a divided fitting portion that constitutes a part of the fitting portion on the inner peripheral surface (seventh configuration).

[0020] As a result, the divided fitting portions of the plurality of divided bodies can be fitted to the fitting portion to be fitted of the pin joint portion from the radially outer side. Therefore, the joint protection member can be easily attached to the pin joint portion. Further, compared with a joining structure in which the joint protection member is attached to the pin joint portion from the axial direction with the axis of the joint protection member being aligned with the axis of the pin joint portion, the workability of the attachment and detachment operations can be improved. Therefore, a joining structure of a pin joint portion and a joint protection member capable of improving the workability of the attachment and detachment operations can be provided.

[0021] A method for attaching a joint protection member according to an embodiment of the present invention is a method for attaching a cylindrical joint protection member onto the outer peripheral surface of a cylindrical pin joint portion connected to an end portion in the longitudinal direction of a steel pipe. This method for attaching the joint protection member includes a fitting step of fitting the divided fitting portions of the plurality of divided bodies to a groove portion or a protrusion extending in the circumferential direction on the outer peripheral surface of the pin joint portion, and a divided body connection step of connecting the connection portions of the divided bodies adjacent to each other in the circumferential direction among the plurality of divided bodies in the circumferential direction (first method).

[0022] By this method, the split fitting portions of a plurality of split bodies can be fitted to the groove portions or protrusion portions of the pin joint portion connected to the longitudinal end portion of the steel pipe from the radially outer side. Therefore, the joint protection member can be easily attached to the pin joint portion. Further, compared with the attachment method of axially attaching the joint protection member to the pin joint portion with the axis of the joint protection member aligned with the axis of the pin joint portion, the workability of the attachment and detachment operations can be improved.

[0023] In addition, since the joint protection member can be attached to the pin joint portion from the radially outer side, for example, the joint protection member can be attached to the pin joint portion with the longitudinal direction of the steel pipe in the horizontal direction. Therefore, compared with the attachment method of attaching the joint protection member from above the pin joint portion with the longitudinal direction of the steel pipe in the vertical direction and the pin joint portion disposed above the steel pipe, the workability of the attachment and detachment operations can be improved.

[0024] Therefore, it is possible to provide an attachment method of a joint protection member capable of improving the workability of the attachment and detachment operations for the pin joint portion.

Effect of the Invention

[0025] A joint protection member according to an embodiment of the present invention includes a plurality of split bodies connected in a circumferentially arranged state, and a fitting portion formed on an inner peripheral surface and capable of fitting to a groove portion or a protrusion portion extending in the circumferential direction on an outer peripheral surface of the pin joint portion. Each of the plurality of split bodies has a split fitting portion on its inner peripheral surface that constitutes a part of the fitting portion.

[0026] As a result, the split fitting portions of the plurality of split bodies can be fitted to the groove portion or the protrusion portion of the pin joint portion from the radially outer side. Therefore, the joint protection member can be easily attached to the pin joint portion. In addition, compared with a configuration in which the joint protection member is attached to the pin joint portion from the axial direction with the axis of the joint protection member aligned with the axis of the pin joint portion, the workability of the attachment and detachment operations can be improved. Therefore, it is possible to provide a joint protection member that can improve the workability of the attachment and detachment operations.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, each embodiment will be described with reference to the drawings. In each figure, the same reference numerals are given to the same parts, and the description of the same parts will not be repeated. Note that the dimensions of the constituent members in each figure do not faithfully represent the actual dimensions of the constituent members and the dimensional ratios of the constituent members.

[0029] In the following description, the axial direction means the direction in which the axis P of the steel pipe 2 extends. The radial direction means the direction orthogonal to the axis P of the steel pipe 2, that is, the radial direction of the steel pipe 2. The circumferential direction means the direction along an arc centered on the axis P of the steel pipe 2.

[0030] [Embodiment 1] (Overall Configuration) With reference to FIGS. 1 to 5, a joining structure 1 having a pin joint portion 3 and a joint protection member 4 according to Embodiment 1 of the present invention will be described. FIG. 1 is a view showing a state in which the pin joint portion 3 and the joint protection member 4 are joined. FIG. 2 is an exploded view of FIG. 1. FIG. 3 is a view showing an enlarged part of the joining structure 1. FIG. 4 is a sectional view taken along line IV-IV of FIG. 3. FIG. 5 is a sectional view taken along line V-V of FIG. 3.

[0031] As shown in FIG. 2, the pin joint portion 3 is connected to one end portion of the steel pipe 2 in the longitudinal direction. A box joint portion (not shown) is connected to the other end portion of the steel pipe 2 in the longitudinal direction. The steel pipe 2 and another steel pipe 2 are connected in the longitudinal direction by disposing the pin joint portion 3 of the steel pipe 2 inside the box joint portion of the other steel pipe 2 and welding the box joint portion and the pin joint portion 3.

[0032] As shown in FIG. 2, the pin joint portion 3 is cylindrical. The pin joint portion 3 has a fitted portion 32 on the outer peripheral surface 31, which is used when connecting to the box joint portion. The fitted portion 32 is, for example, a groove portion or a protrusion portion extending in the circumferential direction on the outer peripheral surface 31 of the pin joint portion 3. In the present embodiment, a case where the fitted portion 32 of the pin joint portion 3 is a groove portion extending in the circumferential direction will be described as an example. In the present embodiment, the fitted portion 32 extends over the entire circumference on the outer peripheral surface 31 of the pin joint portion 3.

[0033] As shown in FIG. 1, the joint protection member 4 is attached on the outer peripheral surface 31 of the pin joint portion 3. The joint protection member 4 protects the pin joint portion 3 from being deformed or the like when an external force is applied, for example, on the side of the pin joint portion 3 in the steel pipe 2.

[0034] (Configuration of joint protection member) As shown in FIGS. 1 and 2, the joint protection member 4 has a plurality of divided bodies 5 and a connecting member 8. The plurality of divided bodies 5 are arranged in the circumferential direction. The divided bodies 5 adjacent in the circumferential direction are connected at the circumferential ends. In a state where the plurality of divided bodies 5 are connected, the joint protection member 4 is cylindrical.

[0035] As shown in FIGS. 2 and 4, the joint protection member 4 has a fitting portion 43 on the inner peripheral surface 41, which fits into the fitted portion 32 of the pin joint portion 3. In the present embodiment, the fitted portion 32 of the pin joint portion 3 is a groove portion extending in the circumferential direction. Therefore, in the present embodiment, the joint protection member 4 has a protrusion portion extending in the circumferential direction on the inner peripheral surface 41, which can be fitted into the groove portion of the pin joint portion 3. In the present embodiment, the fitting portion 43 extends over the entire circumference on the inner peripheral surface 41 of the joint protection member 4.

[0036] As shown in FIG. 1, the plurality of divided bodies 5 cover the outer peripheral surface 31 of the pin joint portion 3 in a state of being connected in the circumferential direction. In the present embodiment, all of the plurality of divided bodies 5 have the same configuration. Therefore, first, the configuration of one divided body 5 will be described.

[0037] As shown in FIG. 2, the split body 5 is arc-shaped when viewed in the axial direction. The split body 5 has an inner peripheral surface 51 and an outer peripheral surface 52. The inner peripheral surface 51 of the split body 5 constitutes a part of the inner peripheral surface 41 of the joint protection member 4. The split body 5 has, on the inner peripheral surface 51, a split fitting portion 53 that constitutes a part of the fitting portion 43 of the joint protection member 4. In the present embodiment, the fitting portion 43 is a protrusion extending in the circumferential direction. Therefore, in the present embodiment, the split body 5 has a protrusion extending in the circumferential direction on the inner peripheral surface 51 of the split body 5. The split fitting portion 53 is fitted to a part of the fitted portion 32 of the pin joint portion 3.

[0038] As shown in FIG. 3, the split body 5 has a first connection portion 56 at one end portion 54 on one side in the circumferential direction, and a second connection portion 57 at the other end portion 55 on the other side in the circumferential direction. The split body 5a and the split body 5b adjacent to the split body 5a in one direction in the circumferential direction are connected in the circumferential direction by connecting the first connection portion 56 at one end portion 54 of the split body 5a and the second connection portion 57 at the other end portion 55 of the split body 5b. The split body 5a and the split body adjacent to the split body 5a in the other direction in the circumferential direction are connected in the circumferential direction by connecting the second connection portion 57 at the other end portion 55 of the split body 5a and the first connection portion 56 at one end portion 54 of the adjacent split body. Hereinafter, when it is necessary to distinguish between a plurality of split bodies 5, the alphabet is added to the symbol of the split body, such as the split body 5a and the split body 5b, and when it is not necessary to distinguish, it is referred to as the split body 5.

[0039] In the present embodiment, the joint protection member 4 has two split bodies 5 of the same shape. The two split bodies 5 are each semi-circular when viewed in the axial direction. Therefore, in the present embodiment, the first connection portion 56 of the split body 5a and the second connection portion 57 of the split body 5b are connected, and the second connection portion 57 of the split body 5a and the first connection portion 56 of the split body 5b are connected. The central angles of the two split bodies 5 are 180 degrees. Therefore, the two split bodies 5 can be attached to and detached from the pin joint portion 3 from the radially outer side, respectively.

[0040] Note that the joint protection member may have three or more divided bodies. Even in this case, by making the central angle of each divided body 180 degrees or less, each can be attached to and detached from the pin joint portion in the radial direction.

[0041] In the present embodiment, one-side connection portion 56 of divided body 5a and the other-side connection portion 57 of divided body 5b, and the other-side connection portion 57 of divided body 5a and the one-side connection portion 56 of divided body 5b are connected via a connecting member 8, respectively.

[0042] Specifically, as shown in FIGS. 3 and 5, the divided body 5 has a bolt insertion hole 61 penetrating the one-side connection portion 56 and a bolt insertion hole 62 penetrating the other-side connection portion 57. The bolt insertion hole 61 extends from an opening 61a located on the circumferential end face of the one-side end portion 54 in the tangential direction of the one-side end portion 54 and opens on the outer peripheral surface 52 of the divided body 5. The bolt insertion hole 62 extends from an opening 62a located on the circumferential end face of the other-side end portion 55 in the tangential direction of the divided body 5 and opens on the outer peripheral surface 52 of the other-side end portion 55.

[0043] The opening 61a of the bolt insertion hole 61 and the opening 62a of the bolt insertion hole 62 are located at the same axial position in the joint protection member 4. Therefore, a through hole penetrating the one-side connection portion 56 and the other-side connection portion 57 is formed by the opening 61a of the bolt insertion hole 61 in the divided body 5a and the opening 62a of the bolt insertion hole 62 in the divided body 5b adjacent to the divided body 5a.

[0044] In the present embodiment, the connecting member 8 is a fastening member that fastens the divided bodies 5 adjacent in the circumferential direction. The divided body 5a and the divided body 5b are fastened by a fastening member 81 penetrating the bolt insertion hole 61 penetrating the one-side connection portion 56 of the divided body 5a and the bolt insertion hole 62 penetrating the other-side connection portion 57 of the divided body 5b, and a fastened member 82 fastened to the fastening member 81. Also, the divided body 5a and the divided body 5b are fastened by a fastening member 81 penetrating the bolt insertion hole 62 penetrating the other-side connection portion 57 of the divided body 5a and the bolt insertion hole 61 penetrating the one-side connection portion 56 of the divided body 5b, and a fastened member 82 fastened to the fastening member 81.

[0045] As shown in FIG. 4, in a state where a plurality of divided bodies 5 are connected, the fitting portion 43 of the joint protection member 4 formed by the plurality of divided fitting portions 53 of the plurality of divided bodies 5 protrudes in a direction intersecting the axial direction of the pin joint portion 3. Therefore, in a state where the fitted portion 32 of the pin joint portion 3 and the fitting portion 43 of the joint protection member 4 are fitted, the joint protection member 4 cannot move axially with respect to the pin joint portion 3. That is, by connecting the plurality of divided bodies 5 in the circumferential direction, the joint protection member 4 can be fixed axially with respect to the pin joint portion 3.

[0046] By the joint protection member 4 having the above-described configuration, the plurality of divided bodies 5 are arranged on the outer peripheral surface 31 of the pin joint portion 3, and the plurality of divided bodies 5 are connected in the circumferential direction, whereby the joint protection member 4 can be fixed to the pin joint portion 3. A joining structure 1 of the pin joint portion 3 and the joint protection member 4 can be obtained. Therefore, after the joint protection member 4 is arranged on the outer peripheral surface of the pin joint portion 3, compared with a joining structure using a connecting member for connecting the pin joint portion 3 and the joint protection member 4, the pin joint portion 3 and the joint protection member 4 can be easily attached and detached. A joining structure 1 can be provided.

[0047] Further, in the joining structure 1 of the present embodiment, by loosening the fastened member 82 with respect to the fastening member 81, a gap can be formed between the circumferential directions of the plurality of divided bodies 5 in a circumferentially connected state. That is, in a state where the fastening member 81 penetrates the bolt insertion holes 61 and 62, the inner diameter of the joint protection member 4 can be made larger than the outer diameter of the pin joint portion 3. Thereby, a joining structure 1 in which the joint protection member 4 can be attached from the radially outer side with respect to the pin joint portion 3 can be provided.

[0048] As described above, the joint protection member 4 according to Embodiment 1 of the present invention includes a plurality of divided bodies 5 that are connected in a state of being arranged in the circumferential direction, and is formed on the inner peripheral surface 51 and extends in the circumferential direction on the outer peripheral surface 31 of the pin joint portion 3. And a fitting portion 43 that can be fitted to the groove portion. Each of the plurality of divided bodies 5 has a divided fitting portion 53 that forms a part of the fitting portion 43 on the inner peripheral surface 51.

[0049] In the joint protection member 4 having the above-described configuration, the split fitting portions 53 of the plurality of split bodies 5 can be fitted to the fitted portion 32 of the pin joint portion 3 from the radially outer side. Therefore, the joint protection member 4 can be easily attached to the pin joint portion 3. Further, compared with a configuration in which the joint protection member is attached to the pin joint portion from the axial direction with the axis of the joint protection member aligned with the axis of the pin joint portion, the workability of the attachment and detachment operations can be improved. Therefore, it is possible to provide the joint protection member 4 capable of improving the workability of the attachment and detachment work.

[0050] Further, the plurality of split bodies 5 have a first connection portion 56 at one end portion 54 on one side in the circumferential direction and a second connection portion 57 at the other end portion 55 on the other side in the circumferential direction. The split bodies 5a and 5b adjacent to each other in the circumferential direction among the plurality of split bodies 5 are connected by the first connection portion 56 and the second connection portion 57 adjacent to each other in the circumferential direction, and thus are connected in the circumferential direction.

[0051] Thereby, it is possible to provide a configuration in which the plurality of split bodies 5 can be connected in the circumferential direction in a state of being disposed on the outer peripheral surface 31 of the pin joint portion 3. Therefore, the workability of the operation of attaching and detaching the joint protection member to and from the pin joint portion can be improved.

[0052] Further, the joint protection member 4 has a connecting member 8 that penetrates the first connection portion 56 and the second connection portion 57 adjacent to each other in the circumferential direction and connects the split bodies 5a and 5b adjacent to each other in the circumferential direction.

[0053] Thereby, the plurality of split bodies 5 can be easily connected in the circumferential direction. Therefore, the workability of the operation of attaching and detaching the joint protection member 4 to and from the pin joint portion 3 can be improved.

[0054] Further, the joining structure 1 according to Embodiment 1 of the present invention includes a cylindrical pin joint portion 3 connected to the longitudinal end of the steel pipe 2, and a cylindrical joint protection member 4 attached to the outer peripheral surface 31 of the pin joint portion 3. The pin joint portion 3 has a fitted portion 32, which is a groove extending in the circumferential direction, on the outer peripheral surface 31. The joint protection member 4 includes a plurality of divided bodies 5 connected in a circumferentially arranged state, and a fitting portion 43 formed on the inner peripheral surface 51 and capable of fitting into the fitted portion 32 of the pin joint portion 3. Each of the plurality of divided bodies 5 has a divided fitting portion 53 on the inner peripheral surface 51, which constitutes a part of the fitting portion 43.

[0055] Thereby, the divided fitting portions 53 of the plurality of divided bodies 5 can be fitted into the fitted portion 32 of the pin joint portion 3 from the radially outer side. Therefore, the joint protection member 4 can be easily attached to the pin joint portion 3. In addition, compared with a joining structure in which the joint protection member is attached to the pin joint portion axially with the axis of the joint protection member aligned with the axis of the pin joint portion, the workability of the attachment and detachment operations can be improved. Therefore, a joining structure 1 of the pin joint portion 3 and the joint protection member 4 capable of improving the workability of the attachment and detachment operations can be provided.

[0056] (Attachment method) Next, with reference to FIGS. 6 to 9, a method of attaching the joint protection member 4 having the above-described configuration to the pin joint portion 3 will be described. The attachment method of the joint protection member 4 includes a preparation step S1, a fitting step S2, and a divided body connection step S3.

[0057] The preparation step S1 is a step of preparing for attaching the joint protection member 4 to the pin joint portion 3. Specifically, in the preparation step S1, first, as shown in FIG. 6, the joint protection member 4 in which the plurality of divided bodies 5 are connected in a circumferentially arranged state is placed on the workbench T so that the direction in which the axis Q of the joint protection member 4 extends is the vertical direction. Further, the steel pipe 2 is arranged so that the direction in which the axis P extends is the horizontal direction and the pin joint portion 3 side is located on the workbench T side.

[0058] Next, as shown in FIG. 7, change the posture of the joint protection member 4 so that the direction in which the axis Q of the joint protection member 4 extends is the horizontal direction and is the same as the direction in which the axis P of the steel pipe 2 extends. Next, as shown in FIG. 8, separate the connection portions of the plurality of divided bodies 5 from each other in the circumferential direction to release the connected state.

[0059] The fitting step S2 is a step of fitting the divided fitting portions 53 of the plurality of divided bodies 5 to a fitted portion 32 that extends in the circumferential direction on the outer peripheral surface 31 of the pin joint portion 3. Specifically, as shown in FIG. 9, when the pin joint portion 3 is viewed in the radial direction, the plurality of divided bodies 5 are moved in the axial direction until the divided fitting portions 53 of the plurality of divided bodies 5 overlap with the fitted portion 32 of the pin joint portion 3.

[0060] Next, in the divided body connection step S3, the connection portions of the plurality of divided bodies 5 are connected to each other in the circumferential direction.

[0061] Through the above steps, the joint protection member 4 is attached to the pin joint portion 3. That is, in the above-described steps, the plurality of divided bodies 5 are arranged on the outer peripheral surface 31 of the pin joint portion 3, and the plurality of divided bodies 5 are connected in the circumferential direction, so that the joint protection member 4 is fixed to the pin joint portion 3. Therefore, the joint protection member 4 can be easily attached to the pin joint portion 3.

[0062] As described above, the method for attaching the joint protection member 4 according to Embodiment 1 of the present invention is a method for attaching the cylindrical joint protection member 4 onto the outer peripheral surface of the cylindrical pin joint portion 3 connected to the longitudinal end of the steel pipe 2. The method for attaching the joint protection member 4 includes a fitting step S2 of fitting the divided fitting portions 53 of the plurality of divided bodies 5 to a fitted portion 32 that is a groove portion extending in the circumferential direction on the outer peripheral surface 31 of the pin joint portion 3, and a divided body connection step S3 of connecting one side connection portion 56 of the divided body 5a adjacent in the circumferential direction among the plurality of divided bodies 5 and the other side connection portion 57 of the divided body 5b in the circumferential direction.

[0063] According to this method, the split fitting portions 53 of the plurality of split bodies 5 can be fitted to the fitted portion 32 of the pin joint portion 3 connected to the longitudinal end portion of the steel pipe 2 from the radially outer side. Therefore, the joint protection member 4 can be easily attached to the pin joint portion 3. Further, compared with the attachment method of attaching the joint protection member 4 to the pin joint portion 3 from the axial direction with the axis of the joint protection member 4 aligned with the axis of the pin joint portion 3, the workability of the attachment and detachment operations can be improved.

[0064] Also, since the joint protection member 4 can be attached to the pin joint portion 3 from the radially outer side, for example, the joint protection member 4 can be attached to the pin joint portion 3 with the longitudinal direction of the steel pipe 2 in the horizontal direction. Therefore, compared with the attachment method of attaching the joint protection member 4 from above the pin joint portion 3 with the longitudinal direction of the steel pipe 2 in the vertical direction and the pin joint portion 3 disposed above the steel pipe 2, the workability of the attachment and detachment operations can be improved.

[0065] Therefore, it is possible to provide an attachment method for the joint protection member 4 that can improve the workability of the attachment and detachment operations for the pin joint portion 3.

[0066] [Embodiment 2] With reference to FIGS. 10 and 11, the joint protection member 104 according to Embodiment 2 will be described. In the present embodiment, the connection structure of the plurality of split bodies 105 included in the joint protection member 104 is different from the connection structure of the split body 5 according to Embodiment 1. In the following description, the same reference numerals are given to the same configurations as those in Embodiment 1, and the description thereof is omitted, and only the portions different from the configuration of Embodiment 1 will be described.

[0067] FIG. 10 is an enlarged view showing a part of the plurality of split bodies 105 in the joint protection member 104 according to Embodiment 2. FIG. 11 is a sectional view taken along the line XI-XI of FIG. 10. In FIG. 10, for the sake of explanation, the connecting member 108 is shown separated from the plurality of split bodies 105, and the first groove portion 161 of the split body 105 is shown hatched.

[0068] The joint protection member 104 has a plurality of divided bodies 105 and a connecting member 108. The joint protection member 104 has a fitting portion 43 on the inner peripheral surface 41 that fits into the fitted portion 32 of the pin joint portion 3. The plurality of divided bodies 105 are connected in the circumferential direction.

[0069] The divided body 105 has an inner peripheral surface 51 and an outer peripheral surface 152. Since the configuration of the inner peripheral surface 51 of the divided body 105 is the same as that of the inner peripheral surface 51 of the divided body 5 in Embodiment 1, the description thereof is omitted.

[0070] In the present embodiment, the divided body 105 has a first connection portion 156 at one end portion 154 on one side in the circumferential direction and a second connection portion 157 at the other end portion 155 on the other side in the circumferential direction. The first connection portion 156 of the divided body 105a and the second connection portion 157 of the divided body 105b, and the second connection portion 157 of the divided body 105a and the first connection portion 156 of the divided body 105b are connected via the connecting member 108, respectively.

[0071] The first connection portion 156 of the divided body 105 includes a first groove portion 161 provided on the outer peripheral surface 152. The first groove portion 161 has a circumferential groove portion 161a extending in the circumferential direction and an axial groove portion 161b extending in the axial direction. In the present embodiment, the axial groove portion 161b extends axially in one direction from the end of the circumferential groove portion 161a. That is, the first groove portion 161 of the first connection portion 156 is L-shaped.

[0072] The second connection portion 157 of the divided body 105 includes a second groove portion 162 provided on the outer peripheral surface 152. The second groove portion 162 has a circumferential groove portion 162a extending in the circumferential direction and an axial groove portion 162b extending in the axial direction. In the present embodiment, the axial groove portion 162b extends axially in one direction from the end of the circumferential groove portion 162a. That is, the second groove portion 162 of the second connection portion 157 is L-shaped.

[0073] The circumferential groove portion 161a of the one-side connection portion 156 and the circumferential groove portion 162a of the other-side connection portion 157 are located at the same axial position in the joint protection member 4. Therefore, a groove portion straddling the one-side connection portion 156 and the other-side connection portion 157 is formed by the circumferential groove portion 161a of the one-side connection portion 156 in the divided body 105a and the circumferential groove portion 162a of the other-side connection portion 157 in the divided body 105b adjacent to the divided body 105a.

[0074] In the present embodiment, the connecting member 108 has a columnar shaft portion 181 extending in the longitudinal direction and a pair of locking portions 182 and 183 extending in a direction intersecting the longitudinal direction from the shaft portion 181. The pair of locking portions 182 and 183 extend in the same direction with respect to the shaft portion 181 at positions symmetric with respect to the longitudinal center of the shaft portion 181. In the present embodiment, one of the locking portions 182 is connected to one end of the shaft portion 181 in the longitudinal direction, and the other locking portion 183 is connected to the other end of the shaft portion 181 in the longitudinal direction.

[0075] The length of the shaft portion 181 is equal to the length of the groove portion extending circumferentially across the one-side connection portion 156 and the other-side connection portion 157 in the divided body 105. The position where one of the locking portions 182 is connected with respect to the longitudinal center of the shaft portion 181 coincides with the position where the axial groove portion 161b is connected to the circumferential groove portion 161a. The position where the other locking portion 183 is connected with respect to the longitudinal center of the shaft portion 181 coincides with the position where the axial groove portion 162b is connected to the circumferential groove portion 162a.

[0076] Therefore, the connecting member 108 can be disposed in a first groove portion 161 and a second groove portion 162 that extend across the circumferentially adjacent divided bodies 105a and 105b. With the connecting member 108 disposed in the first groove portion 161 and the second groove portion 162, one of the pair of locking portions 182 that extend in the axial direction of the connecting member 108 is located in the axially extending axial groove portion 161b of the divided body 105a. In the axially extending axial groove portion 162b of the divided body 105b, the other locking portion 183 of the pair of locking portions that extend in the axial direction of the connecting member 108 is located. Thereby, the circumferentially adjacent divided bodies 105a and 105b can be connected in the circumferential direction.

[0077] That is, the joint protection member 104 according to the second embodiment of the present invention has a connecting member 108 having an axial portion 181 that extends in the circumferential direction and a pair of locking portions 182 and 183 that extend in the axial direction of the joint protection member 104 from positions that are separated from each other in the longitudinal direction of the axial portion 181. One side connection portion 156 of one of the circumferentially adjacent connection portions includes a circumferential groove portion 161a that extends in the circumferential direction and in which a part of the axial portion 181 of the connecting member 108 is accommodated, and an axial groove portion 161b that extends in the axial direction of the joint protection member 104 from the circumferential groove portion 161a and in which one of the pair of locking portions, i.e., one locking portion 182 that extends axially from a part of the axial portion 181, is accommodated, and includes a first groove portion 161. The other side connection portion 157 of the other of the circumferentially adjacent connection portions includes a circumferential groove portion 162a that extends in the circumferential direction and in which the remaining portion of the axial portion 181 of the connecting member 108 is disposed, and an axial groove portion 162b that extends in the axial direction of the joint protection member 104 from the circumferential groove portion 162a and in which the other locking portion 183 of the pair of locking portions, i.e., the other locking portion that extends axially from the remaining portion of the axial portion 181, is accommodated, and includes a second groove portion 162. The circumferentially adjacent divided bodies 105a and 105b are connected in the circumferential direction by the connecting member 108 disposed across the circumferentially adjacent first groove portion 161 and second groove portion 162.

[0078] In this configuration, a locking portion 182 extending in the axial direction of the joint protection member 104 in the connecting member 108 is accommodated in the axial groove portion 161b of one of the divided bodies 105 adjacent in the circumferential direction. A locking portion 183 extending in the axial direction in the connecting member 108 is accommodated in the axial groove portion 162b of the other divided body 105b of the divided bodies 105 adjacent in the circumferential direction. Therefore, the divided body 105a having the axial groove portion 161b in which the locking portion 182 is accommodated cannot move in the circumferential direction with respect to the locking portion 182. Also, the divided body 105b having the axial groove portion 162b in which the locking portion 183 is accommodated cannot move in the circumferential direction with respect to the locking portion 183. Thus, a configuration that can easily and more reliably connect the adjacent divided bodies 105a and 105b in the circumferential direction can be realized.

[0079] [Other Embodiments] As described above, the embodiments of the present invention have been described. However, the above-described embodiments are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above-described embodiments, and it is possible to appropriately modify and implement the above-described embodiments without departing from the spirit thereof.

[0080] In each of the above embodiments, the fitted portion 32 of the pin joint portion 3 is a groove portion extending in the circumferential direction. The fitting portion 43 of the joint protection members 4 and 104 is a protrusion extending in the circumferential direction. The divided fitting portion 53 of the divided bodies 5 and 105 is a protrusion extending in the circumferential direction. However, the fitted portion of the pin joint portion may be a protrusion extending in the circumferential direction. In this case, the fitting portion of the joint protection member may be a groove portion extending in the circumferential direction. The divided fitting portion of the divided body may be a groove portion extending in the circumferential direction. Note that the fitted portion of the pin joint portion may have a configuration including both a protrusion and a groove portion. In this case, the fitting portion of the joint protection member may have a configuration that can be fitted with the fitted portion of the pin joint portion.

[0081] In each of the above embodiments, the fitted portion 32 of the pin joint portion 3 extends over the entire circumference of the pin joint portion 3. The fitting portion 43 of the joint protection members 4 and 104 extends over the entire circumference of the joint protection members 4 and 104. However, as long as the fitted portion of the pin joint portion and the fitting portion of the joint protection member can be fitted together, the fitted portion may extend over a part of the circumferential direction of the pin joint portion. The fitting portion may extend over a part of the circumferential direction of the joint protection member.

[0082] In each of the above embodiments, the fitting portion 43 of the joint protection members 4 and 104 extends over the entire circumference of the joint protection members 4 and 104. However, as long as each of the plurality of divided bodies is configured to have at least a part of the fitting portion, the fitting portion does not have to extend over the entire circumference of the joint protection member.

[0083] In each of the above embodiments, the plurality of divided bodies 5 and 105 all have the same configuration. However, as long as the plurality of divided bodies can be connected in the circumferential direction, they may have different configurations from each other.

[0084] In Embodiment 1 above, the divided body 5 has two one-side connection portions 56 at one-side end portion 54 and two other-side connection portions 57 at the other-side end portion 55. However, the divided body may have one, three, or three or more one-side connection portions at one-side end portion and one, three, or three or more other-side connection portions at the other-side end portion.

[0085] The circumferential connection structure of the plurality of divided bodies 5 and 105 in each of the above embodiments is an example. The connection structure may be any structure as long as it can connect the circumferential end portions of arc-shaped members when viewed in the axial direction. For example, the plurality of divided bodies may have flange portions protruding in the radial direction at the circumferential end portions, and the flange portions may be fastened to each other via fastening members.

[0086] The configurations of the connecting member 108, the first groove portion 161, and the second groove portion 162 in the second embodiment are merely examples. As long as the pair of locking portions of the connecting member are located at positions separated from each other in the longitudinal direction of the shaft portion, they may be located anywhere on the shaft portion. The pair of locking portions may extend in different directions with respect to the shaft portion. Further, the connecting member may include a curved portion. That is, the locking portion only needs to have a portion that extends in a direction including an axial component. The first groove portion and the second groove portion may have a configuration capable of accommodating the connecting member.

[0087] Also, as shown in FIG. 12, the locking portions 282 and 283 of the connecting member 208 may extend from the longitudinal ends of the shaft portion 281 to one side and the other side in the axial direction of the joint protection member. In this case, the first groove portion 261 may include a circumferential groove portion 261a that extends in the circumferential direction and accommodates a part of the shaft portion 281, and axial groove portions 261b that extend from the ends of the circumferential groove portion 261a to one side and the other side in the axial direction of the joint protection member and accommodate the locking portion 282. The second groove portion 262 may include a circumferential groove portion 262a that extends in the circumferential direction and accommodates the remaining part of the shaft portion 281, and axial groove portions 262b that extend from the ends of the circumferential groove portion 262a to one side and the other side in the axial direction and accommodate the locking portion 283.

[0088] In the second embodiment, both the one-side connection portion 156 and the other-side connection portion 157 adjacent in the circumferential direction have the axial groove portions 161b and 162b. However, only one of the one-side connection portion and the other-side connection portion adjacent in the circumferential direction may have a groove portion that extends in the axial direction. In this case, the end of the shaft portion of the connecting member may be fixed to the other of the one-side connection portion and the other-side connection portion.

[0089] For example, as shown in FIG. 13, the joint protection member 304 may have a connecting member 308 having a shaft portion 381 extending in the circumferential direction and a locking portion 382 extending in the axial direction of the joint protection member 304 from the shaft portion 381. One side connection portion 356 of one of the connection portions adjacent in the circumferential direction may have a first circumferential groove portion 361 extending in the circumferential direction and accommodating one longitudinal end portion of the shaft portion 381 in the connecting member 308, and a fixing portion 361a for fixing one longitudinal end portion of the shaft portion 381 in the first circumferential groove portion 361. The other side connection portion 357 of the other of the connection portions adjacent in the circumferential direction may have a second circumferential groove portion 362a extending in the circumferential direction and accommodating the remaining portion of the shaft portion 381 of the connecting member 308, and an axial groove portion 362b extending in the axial direction of the joint protection member 304 from the second circumferential groove portion 362a and accommodating the locking portion 382. The divided bodies 305 adjacent in the circumferential direction may be circumferentially connected by a connecting member 308 disposed across the grooves adjacent in the circumferential direction.

[0090] Even with such a configuration, it is possible to provide a configuration in which a plurality of divided bodies can be easily connected in the circumferential direction.

[0091] In addition, in the connection structure shown in FIG. 13, as shown in FIG. 14, the locking portion 482 of the connecting member 408 may extend in one and the other axial directions of the joint protection member from the longitudinal end portion of the shaft portion 481. In this case, one of the connection portions adjacent in the circumferential direction may have a first circumferential groove portion 461 accommodating one longitudinal end portion of the shaft portion 481 and a fixing portion 461a for fixing the shaft portion 481. The other of the connection portions adjacent in the circumferential direction may have a second circumferential groove portion 462a accommodating the remaining portion of the shaft portion 481, and an axial groove portion 462b extending in one and the other axial directions from the second circumferential groove portion 462a and accommodating the locking portion 482.

[0092] The attachment method of the joint protection member 4 in the first embodiment is an example. For example, the joint protection member may be attached to the pin joint portion by arranging a plurality of divided bodies in a divided state one by one on the outer peripheral surface of the pin joint portion and connecting the divided bodies adjacent in the circumferential direction to each other in the circumferential direction. That is, the attachment method of the joint protection member may not have the preparation process as described in the first embodiment.

[0093] In the attachment method of the joint protection member 4 of the first embodiment, in the fitting step S2, the joint protection member 4 is attached to the pin joint portion 3 with the axial direction of the pin joint portion 3 in the horizontal direction. However, the joint protection member may be attached to the pin joint portion with the axial direction of the pin joint portion in the vertical direction.

Industrial Applicability

[0094] The present invention can be used for a protection member that protects a pin joint portion connected to a longitudinal end portion of a steel pipe.

Explanation of Reference Numerals

[0095] 1 Joint structure 2 Steel pipe 3 Pin joint portion 31 Outer peripheral surface 32 Fitted portion 4, 104, 304 Joint protection member 41 Inner peripheral surface 43 Fitting portion 5, 5a, 5b, 105, 105a, 105b, 305 Divided body 51 Inner peripheral surface 52, 152 Outer peripheral surface 53 Divided fitting portion 54, 154 One-side end portion (one end portion in the circumferential direction) 55, 155 Other-side end portion (the other end portion in the circumferential direction) 56, 156, 356 One-side connection portion (connection portion) 57, 157, 357 Other-side connection portion (connection portion) 61, 62 Bolt insertion hole 61a, 62a Opening 8, 108, 208, 308, 408 connecting members 81 fastening member 82 fastened member 161, 261 first groove part 161a, 162a, 261a, 262a circumferential groove part 161b, 162b, 261b, 262b, 362b, 462b axial groove part 162, 262 second groove part 181, 281, 381, 481 shaft part 182, 183, 282, 283, 382, 482 locking part 361, 461 first circumferential groove part 361a, 461a fixing part 362a, 462a second circumferential groove part

Claims

1. A cylindrical joint protection member attached to the outer peripheral surface of a cylindrical pin joint part connected to the longitudinal end of a steel pipe, comprising: a plurality of divided bodies connected in a circumferentially arranged state; a fitting portion formed on the inner peripheral surface and capable of fitting with a groove portion or a protrusion portion formed on the outer peripheral surface of the pin joint portion and extending in the circumferential direction; and having each of the plurality of divided bodies has, on the inner peripheral surface, a divided fitting portion that forms a part of the fitting portion, a joint protection member.

2. In the joint protection member according to Claim 1, the plurality of divided bodies each have a connecting portion at one end in the circumferential direction and the other end in the circumferential direction, and among the plurality of divided bodies, the divided bodies adjacent in the circumferential direction are connected in the circumferential direction by being connected by the connecting portions adjacent to each other in the circumferential direction. a joint protection member.

3. In the joint protection member according to Claim 2, further comprising a connecting member that penetrates the connecting portions adjacent in the circumferential direction and connects the divided bodies adjacent in the circumferential direction, a joint protection member.

4. In the joint protection member according to Claim 2, further comprising a connecting member having a shaft portion extending in the circumferential direction and a locking portion extending in the axial direction of the joint protection member from the shaft portion, wherein one of the connecting portions adjacent in the circumferential direction extends in the circumferential direction and has a first circumferential groove portion in which one longitudinal end portion of the shaft portion in the connecting member is accommodated, and a fixing portion for fixing one longitudinal end portion of the shaft portion in the first circumferential groove portion, and having the other of the connecting portions adjacent in the circumferential direction extends in the circumferential direction and has a second circumferential groove portion in which the remaining portion of the shaft portion of the connecting member is accommodated, and an axial groove portion extending in the axial direction of the joint protection member from the second circumferential groove portion and accommodating the locking portion, and having the divided bodies adjacent in the circumferential direction are connected in the circumferential direction by the connecting member disposed across the grooves adjacent in the circumferential direction. a joint protection member.

5. In the joint protection member according to Claim 2, further comprising a connecting member having a shaft portion extending in the circumferential direction and a pair of locking portions extending in the axial direction of the joint protection member from positions separated from each other in the longitudinal direction of the shaft portion, wherein one of the connecting portions adjacent in the circumferential direction extends in the circumferential direction and has a circumferential groove portion in which a part of the shaft portion of the connecting member is accommodated, An axial groove that extends axially from the circumferential groove portion and houses one of the pair of locking portions that extends axially from a part of the shaft portion, including a first groove portion having The other of the connecting portions adjacent in the circumferential direction is a circumferential groove that extends in the circumferential direction and in which the remaining portion of the shaft portion of the connecting member is disposed, an axial groove that extends axially from the circumferential groove portion and houses the other locking portion that extends axially from the remaining portion of the shaft portion among the pair of locking portions, including a second groove portion having The divided bodies adjacent in the circumferential direction are circumferentially connected by the connecting member disposed across the groove portions adjacent in the circumferential direction, joint protection member.

6. In the joint protection member according to any one of Claims 1 to 5, the pin joint portion has, on its outer peripheral surface, a groove extending in the circumferential direction, The fitting portion is a protrusion extending in the circumferential direction that can be fitted to the groove of the pin joint portion, each of the plurality of divided bodies has, on its inner peripheral surface, a divided protrusion that constitutes a part of the protrusion, joint protection member.

7. a cylindrical pin joint portion connected to an end portion in the longitudinal direction of a steel pipe, a cylindrical joint protection member attached to the outer peripheral surface of the pin joint portion, A joining structure having the pin joint portion has, on its outer peripheral surface, a fitting portion that is a groove or a protrusion extending in the circumferential direction, The joint protection member is a plurality of divided bodies connected in a circumferentially arranged state, a fitting portion formed on the inner peripheral surface and capable of fitting to the fitting portion of the pin joint portion, having each of the plurality of divided bodies has, on its inner peripheral surface, a divided fitting portion that constitutes a part of the fitting portion, joining structure.

8. An attachment method for attaching a cylindrical joint protection member to the outer peripheral surface of a cylindrical pin joint portion connected to an end portion in the longitudinal direction of a steel pipe, a fitting step of fitting the divided fitting portions of the plurality of divided bodies to a groove or a protrusion extending in the circumferential direction on the outer peripheral surface of the pin joint portion, a divided body connection step of connecting the connection portions of the divided bodies adjacent in the circumferential direction among the plurality of divided bodies in the circumferential direction, having attachment method of joint protection member.

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