Joint part structure

Abstract

To provide a joint part structure which can more easily and surely connect joint members while reducing the number of components for connection so as to enhance workability at a construction site.SOLUTION: A joint part structure 10 includes: a first joint member 16 and a second joint member 18; a female screw member 28; and a pin member 32 which is a connection member. A first through-hole 22 formed in the first joint member 16 and a second through-hole 24 formed in the second joint member 18 form a fitting hole 26 continuously in an overlapping direction, when the first joint member 16 and the second joint member 18 are positioned in a predetermined position. The female screw member 28 has a female screw hole 30. The pin member 32 has a fitting part 34 fitted in the fitting hole 26 across the first through-hole 22 and the second through-hole 24, and a male screw part 36 constituted so as to be screwed with the female screw hole 30 continued to the fitting part 34.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a joint structure for connecting members used, for example, between steel pipe piles, steel pipe sheet piles, steel pipes for pipe roof methods, column materials for buildings, water supply pipelines, and the like.

Background Art

[0002] Conventionally, in the construction of long steel pipe piles, steel pipe sheet piles, etc., due to transportation and manufacturing convenience, steel pipes of a fixed length were carried into the construction site, and each steel pipe was connected by welding at the construction site to obtain the desired length.

[0003] However, such connection work by welding requires skilled techniques, and strict construction management is required regarding ensuring working conditions such as climate conditions and quality control of the welded parts. Furthermore, the proportion of time spent on such welding work in the construction time is large, which has been a cause of prolonging the construction period.

[0004] For example, Patent Document 1 discloses a joint structure aimed at enabling short-term and easy connection of each steel pipe at the construction site. The joint structure of Patent Document 1 fits a cylindrical inner joint member fixed to the end of one steel pipe to be connected into a cylindrical outer joint member fixed to the end of the other steel pipe, and engages an arcuate key member across the inner peripheral surface of the outer joint member and the outer peripheral surface of the inner joint member to ensure tensile strength in the pipe axis direction, and has a configuration in which the two joint members are non-rotatably connected by a pin member penetrating through both joint members.

[0005] On the one hand, the joint structure of this Patent Document 1 has a problem that high precision and strict quality control are required for the manufacture of joint members including key members. Patent Document 2 discloses a joint structure directed to solving this problem. In the joint structure according to an embodiment disclosed in Patent Document 2, when the joint member of a pipe member and the joint member of another pipe member connected thereto are fitted together, a key body is fitted into a key member accommodation path formed therein, a movement restraining pin member is inserted into the insertion hole of the joint member, and its tip is penetrated until it is fitted into the fitting hole of the reinforcing member inside thereof. Further, a fixing bolt is passed through the bolt insertion hole of the pin member, and its tip is screwed into the fixing plate material further inside the reinforcing member. This joint structure of Patent Document 2 enables the mechanical connection of steel pipes preferably while preventing or suppressing the initial slip of the joint.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] By the way, in recent years, bridges, offshore wind power generation facilities, etc. have a tendency to become even larger, and the working environment at the construction site tends to become even more severe. Therefore, there is a strong demand to improve the workability of connection work of steel pipes and the like at the construction site.

[0008] An object of the present disclosure is to provide a joint structure that enables easier and more reliable connection of joint members while reducing the number of connecting parts at the construction site to improve the workability at the construction site.

Means for Solving the Problems

[0009] One aspect according to the present disclosure is A first joint member and a second joint member that are relatively movable with respect to each other and are superposed at a predetermined position, wherein a first through hole formed in the first joint member and a second through hole formed in the second joint member form a continuous fitting hole in the superposition direction when the first joint member and the second joint member are located at the predetermined position, the first joint member and the second joint member, A female screw member provided on the side of the second joint member opposite to the first joint member, the female screw member having a female screw hole with an inner diameter smaller than the inner diameters of the first through hole and the second through hole, A connecting member having a fitting portion fitted into the fitting hole across the first through hole and the second through hole and a male screw portion continuous with the fitting portion, the male screw portion being configured to be screwable into the female screw hole of the female screw member, Comprising Joint structure To provide.

[0010] According to the above configuration, the first joint member and the second joint member are positioned at a predetermined position, a fitting hole based on their first and second through holes is formed, the connecting member is fitted into the fitting hole from the first joint member side, and the male screw portion of the connecting member is screwed into the female screw hole of the female screw member, whereby the first joint member and the second joint member can be easily connected. Although it is a connection using only a smaller number of parts in this way, since the fitting portion of the connecting member is fitted across the first through hole and the second through hole, displacement of the first joint member and the second joint member by the connecting member, for example, initial slip can be surely prevented, and the first joint member and the second joint member can be more surely connected.

[0011] Preferably, the fitting portion of the connection member has a tapered side surface that approaches the axis of the connection member as it progresses from the fitting portion side toward the male screw portion side. As a result, by fitting the connection member into the fitting hole, the positioning of the first and second joint members can be performed more suitably. Further, this can more reliably prevent displacement of the first joint member and the second joint member, such as initial slip, and can more reliably connect the first joint member and the second joint member. Further, by providing the fitting portion of the connection member with a tapered side surface in this way, the moment acting around the connection member can be more suitably reduced.

[0012] Preferably, when the first joint member and the second joint member are located at the predetermined positions and the connection member is screwed into the female screw member, the end surface of the fitting portion of the connection member substantially coincides with the outer surface of the first joint member. As a result, it is possible to more reliably prevent the connection member from protruding outside the first joint member and interfering with other operations.

[0013] Preferably, the female screw member is welded to the second joint member. Therefore, the female screw member can be easily provided on the second joint member at a location other than the construction site, for example, at a factory. Further, this can enhance the water-stopping effect around the female screw member and can further enhance the anti-rotation effect of the female screw member when the connection member is attached.

[0014] Preferably, when the first joint member and the second joint member are located at the predetermined positions and the connection member is screwed into the female screw member, the stepped portion between the fitting portion of the connection member and the male screw portion abuts against the female screw member. Therefore, the first joint member and the second joint member can be connected by screwing the connection member until the stepped portion abuts against the female screw member, and the workability can be improved.

[0015] Preferably, the connecting member is provided with a tool engaging concave portion on the end face of the fitting portion of the connecting member, and the tool engaging concave portion is formed offset from the axis of the connecting member. Thereby, a tool can be engaged with the tool engaging concave portion to rotate the connecting member, and the first joint member and the second joint member can be preferably connected. And since the engaging portion of the tool is a concave portion, when the first joint member and the second joint member are connected, the protrusion of the connecting member from the first joint member can be more reliably reduced or eliminated.

[0016] Preferably, the first joint member is cylindrical, the second joint member is cylindrical, and when the first joint member and the second joint member are located at the predetermined positions, the second joint member is fitted inside the first joint member. In this case, for example, the first joint member can be provided on a certain steel pipe, the second joint member can be provided on another steel pipe, and the joint structure can be preferably used for connecting those steel pipes.

Advantages of the Invention

[0017] According to the joint structure of the above aspect, since the above configuration is provided, the joint members can be more easily and reliably connected using fewer parts, and the workability at the construction site can be improved.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, a joint structure according to an embodiment of the present disclosure will be described with reference to the drawings.

[0020] FIGS. 1(a) and (b) show a steel pipe 1 connected using a joint structure 10 according to an embodiment, and FIG. 2 shows a cross-sectional view of the steel pipe 1 along line II-II in FIG. 1(b). However, the line II-II in FIG. 1(b) extends so as to include the pipe axis of the steel pipe 1. FIGS. 3 to 5 are cross-sectional views for explaining the flow of connection between the joint member 16 of one of the steel pipe materials 12 and 14 that are connected to form the steel pipe 1 and the joint member 18 of the other steel pipe material 14, showing the periphery of the joint J or the corresponding location in the same cross-section as FIG. 2. In FIGS. 4 and 5, the pin member 32 described later is shown in a side view rather than a cross-section. FIG. 6 is an enlarged view of part VI in FIG. 2 of the steel pipe 1. The steel pipe 1 described here can be used for a part of a steel pipe pile, a steel sheet pile, etc.

[0021] Each steel pipe member 12, 14 is formed into a cylindrical shape from steel material. The steel pipe members 12, 14 are connected to each other by a joint J. A joint part structure 10 is applied to this joint J.

[0022] As shown in FIG. 2, the joint J includes an outer joint member 16 fixed to one end of one steel pipe member 12 and an inner joint member 18 fixed to one end of the other steel pipe member 14. The outer joint member 16 corresponds to the first joint member, and the inner joint member 18 corresponds to the second joint member. The outer joint member 16 is fixed to the steel pipe member 12 by welding, and the inner joint member 18 is fixed to the steel pipe member 14 by welding via a flange member 20.

[0023] As shown in FIGS. 3 to 6, the flange member 20 has a constant thickness in the direction along the pipe axis A1 (hereinafter referred to as the pipe axis direction), and is formed in an annular shape having an outer diameter substantially the same as the outer diameter of the steel pipe member 14 and an inner diameter smaller than the inner diameter of the steel pipe member 14. One end face of this flange member 20 is welded to the end face of the steel pipe member 14 at the annular outer peripheral portion, and is fixed in a state where the inner edge side portion projects radially inward of the steel pipe member 14, and the inner joint member 18 is fixed to the other end face by welding.

[0024] The joint member side end face 20a of this flange member 20 is configured to be abutted, and the tip end portion 16a of the opposing outer joint member 16 can be abutted. The joint member side end face 20a may be formed as an annular recess so that the tip end portion 16a of the outer joint member 16 can be fitted therein.

[0025] On the other hand, an annular abutting member 33 is fixed to the inner surface portion of the outer joint member 16 by welding or the like. The abutting member 33 is provided so that the tip end portion 18b of the inner joint member 18 can be abutted thereon. A fitting groove into which the outer surface portion 33a of the abutting member 33 is fitted may be formed at the tip end portion 18b of the inner joint member 18. By doing so, the water stoppage property of the joint part structure 10 of the joint J can be further enhanced. Note that the abutting member 33 has a circular cross section here, but may have other cross-sectional shapes.

[0026] The steel pipe members 12 and 14 are relatively movable with respect to each other, and thus the outer joint member 16 and the inner joint member 18 are relatively movable with respect to each other. Both joint members 16 and 18 are each cylindrical, that is, tubular. The two joint members 16 and 18 are relatively moved with respect to each other in the axial direction along the pipe axis A1, the circumferential direction around the pipe axis A1, and / or the radial direction centered on the pipe axis A1. Thus, the inner joint member 18 can be fitted into the outer joint member 16, and the outer joint member 16 and the inner joint member 18 can be positioned at a predetermined position. When the joint members 16 and 18 are in the predetermined position, the tip 16a of the outer joint member 16 may abut against the joint member side end face 20a of the flange member 20. Also, when the joint members 16 and 18 are in the predetermined position, the tip 18b of the inner joint member 18 may abut against the outer surface portion 33a of the abutting member 33.

[0027] As shown in FIG. 3, the outer joint member 16 is formed of steel or the like into a cylindrical shape, that is, a tubular shape as described above, and has a tapered width-increasing portion 16b for fitting that expands as it advances toward the inner joint member 18 side in the axial direction on its inner peripheral portion. On the other hand, the inner joint member 18 is formed of steel or the like into a cylindrical shape, that is, a tubular shape, and has a tapered diameter-reducing portion 18a for fitting that reduces in diameter as it advances toward the outer joint member 16 side in the axial direction on its outer peripheral portion. As shown in FIG. 4, this diameter-reducing portion 18a for fitting is fitted into the width-increasing portion 16b for fitting, and thus the outer joint member 16 and the inner joint member 18 are radially overlapped.

[0028] As shown in FIG. 4, when the outer joint member 16 and the inner joint member 18 are overlapped and positioned at a predetermined position, the through-hole (hereinafter, the outer through-hole) 22 of the outer joint member 16 and the through-hole (hereinafter, the inner through-hole) 24 of the inner joint member 18 overlap in the overlapping direction, that is, in the radial direction, and are continuous. Thereby, the fitting hole 26 is formed by the outer through-hole 22 and the inner through-hole 24. As will be apparent from the description below, here, the outer through-hole 22 is a substantially frustum-shaped hole, the inner through-hole 24 is also a substantially frustum-shaped hole, and thus the fitting hole 26 is a substantially frustum-shaped hole, but these holes 22, 24, 26 may have shapes other than frustum shapes. The hole shapes of these holes 22, 24, 26 are designed to conform to the shape of the fitting portion 34 of the pin member 32, particularly the circumferential side surface 34b of the fitting portion 34 having a tapered shape side surface described later. The shape of the fitting hole 26 can be designed to substantially correspond to the shape of the fitting portion 34 of the pin member 32. Note that the outer through-hole 22 corresponds to the first through-hole, and the inner through-hole 24 corresponds to the second through-hole.

[0029] A plurality of outer through-holes 22 are provided in the outer joint member 16 at equal intervals in the circumferential direction, and a plurality of inner through-holes 24 are provided in the inner joint member 18 at equal intervals in the circumferential direction. And when the outer joint member 16 and the inner joint member 18 are positioned at a predetermined position, each of the outer through-holes 22 is continuous with the corresponding inner through-hole 24. Here, the plurality of outer through-holes 22 are located in the same pipe axis direction in the outer joint member 16 and are arranged at intervals of 45° (= θ in FIG. 1) in the circumferential direction, and the plurality of inner through-holes 24 are located in the same pipe axis direction in the inner joint member 18 and are also arranged at intervals of 45° (= θ in FIG. 1) in the circumferential direction. Therefore, when the outer joint member 16 and the inner joint member 18 are positioned at a predetermined position, eight fitting holes 26 are formed by these outer through-holes 22 and inner through-holes 24. Note that the number of the fitting holes 26 formed in this way is not limited to eight, and the arrangement of the fitting holes 26 is not limited to an interval of 45°. The number and arrangement of the fitting holes 26 and the like may be determined according to the strength required for the steel pipe 1, the steel pipe materials 12, 14, and the like.

[0030] On the inner surface 18i of the inner joint member 18, that is, on the side opposite to the outer joint member 16 of the inner joint member 18 when the outer joint member 16 and the inner joint member 18 are positioned at a predetermined position, a female screw member 28 is provided on the inner joint member 18. The female screw member 28 is a curved substantially circular plate-like member, which is curved according to the curvature of the inner surface 18i of the inner joint member 18 and is provided so as to close the inner through hole 24. And a female screw hole 30 penetrating in the plate thickness direction is formed in the female screw member 28. The female screw hole 30 has an inner diameter smaller than the inner diameters of the outer through hole 22 and the inner through hole 24 respectively. The axis A2 (see FIG. 4) of the female screw hole 30 coincides with the axis of the inner through hole 24. And when the outer joint member 16 and the inner joint member 18 are positioned at a predetermined position, the axis of the outer through hole 22 coincides with the axis of the inner through hole 24 and the axis A2 of the female screw hole 30. Note that the female screw member 28 is a member that functions like a nut having the female screw hole 30 and may be referred to as a nut plate.

[0031] As shown in FIGS. 4 and 5, a pin member 32 is used for connecting the outer joint member 16 and the inner joint member 18. The pin member 32 is an example of a connecting member and has a fitting portion 34 fitted into the fitting hole 26 across the outer through hole 22 and the inner through hole 24, and a male screw portion 36 continuous with the fitting portion 34. The male screw portion 36 is configured to be screwingly engageable with the aforementioned female screw hole 30. The fitting portion 34 is formed in a frustum of a cone shape here. The fitting portion 34 is formed so that its diameter decreases as it advances toward the male screw portion 36 side. The axis 32A of the pin member 32 coincides with the axis of the frustum of a cone-shaped fitting portion 34 and the axis of the male screw portion 36. In the direction of the axis 32A of the pin member 32, in order, there are the end face 34a of the fitting portion 34, the tapered circumferential side face 34b of the fitting portion 34, the stepped portion 34c which is the other end face of the fitting portion 34 and from which the male screw portion 36 extends, and the male screw portions 36 arranged.

[0032] As shown in FIG. 6, the fitting portion 34 of the pin member 32 is formed to fit exactly into the fitting hole 26. The outer through-hole 22 and the inner through-hole 24 are each formed such that the inner peripheral surface 26a of the fitting hole 26 has a tapered shape corresponding to the tapered circumferential side surface 34b of the fitting portion 34. FIG. 6 shows the taper angle α of the fitting portion 34 and the fitting hole 26. When the outer joint member 16 and the inner joint member 18 are located at predetermined positions, the fitting portion 34 is fitted into the fitting hole 26, and the male screw portion 36 of the pin member 32 is firmly screwed into the female screw hole 30 of the female screw member 28, the end surface 34a of the fitting portion 34 of the pin member 32 preferably substantially coincides with the outer surface, that is, the outer peripheral surface 16o of the outer joint member 16. The end surface 34a preferably has a curvature corresponding to the curvature of the outer peripheral surface 16o of the outer joint member 16.

[0033] Here, the entire circumferential side surface 34b of the fitting portion 34 of the pin member 32 is formed in a tapered shape. However, at least a part of it may be formed in a tapered shape. In other words, the pin member 32 preferably has a tapered side surface that approaches the axis 32A of the pin member 32 as it advances from the fitting portion 34 side toward the male screw portion 36 side, and the tapered side surface may be formed on the entire circumferential side surface 34b or a part thereof. As is clear from the description in this specification, the pin member 32 formed in this way has a movement restraining function for preventing relative movement between the outer joint member 16 and the inner joint member 18 for connecting and linking the outer joint member 16 and the inner joint member 18.

[0034] Next, a method for connecting the steel pipes 12 and 14 using such a joint structure 10 will be described.

[0035] To connect the two steel pipes 12 and 14, first, while considering the positions of the through-holes 22 and 24, the two joint members 16 and 18 are relatively moved in the pipe axis direction, and the inner joint member 18 is fitted into the outer joint member 16.

[0036] At this time, as shown in FIGS. 3 and 4, since the outer diameter of the tip 18b of the reduced-diameter fitting portion 18a of the inner joint member 18 is smaller than the inner diameter of the tip 16a of the widened fitting portion 16b of the outer joint member 16, the inner joint member 18 can be easily inserted into the outer joint member 16. Also, after the insertion, while being guided by each other, the tip 16a can slide toward a position where it abuts against the joint member-side end face 20a of the flange member 20. Similarly, at this time, the tip 18b of the inner joint member 18 can slide toward a position where it abuts against the outer surface portion 33a of the abutting member 33.

[0037] Then, the pin members 32 are inserted into the respective fitting holes 26 formed by the through holes 22 and 24 that are continuous in the stacking direction, here the radial direction. As shown in FIG. 7, the pin members 32 are rotated using a rotary tool 40, and the male screw portion 36 at the tip thereof is screwed into the female screw hole 30 of the female screw member 28. Thereby, the pin member 32 is fitted and screwed until the stepped portion 34c between the fitting portion 34 and the male screw portion 36 of the pin member 32 abuts against the female screw member 28. Thus, the two joint members 16 and 18 can be connected.

[0038] At the time of this connection, when the outer joint member 16 and the inner joint member 18 are overlapped and positioned at a predetermined position, and the outer through hole 22 of the outer joint member 16 and the inner through hole 24 of the inner joint member 18 are continuous, initially, even if there is a slight deviation in the positions of these through holes 22 and 24, the pin member 32 is provided with a tapered fitting portion 34, and a tapered fitting hole 26 having substantially the same inclination as the fitting portion 34 of the pin member 32 is formed across the two through holes 22 and 24. Therefore, as the screwing of the pin member 32 progresses, the inner side surfaces of the through holes 22 and 24 press against the circumferential side surface 34b of the pin member 32, and the two joint members 16 and 18 move relatively in a direction in which the central positions of the two through holes 22 and 24 coincide, and the positions of the two through holes 22 and 24 are more accurately aligned and become a more continuous arrangement.

[0039] Fig. 8 shows a rotary tool 40 used for rotating the pin member 32. The rotary tool 40 is a tool whose axis 40A extends in the longitudinal direction, and has a handle part 40b and an acting part 40c arranged in the longitudinal direction. Two protrusions 42 extending substantially orthogonal to the longitudinal direction are provided on the acting part 40c. Each of the protrusions 42 is cylindrical. On the other hand, the pin member 32 is provided with two tool engagement concave portions 34d on the end face 34a of the fitting portion 34. Each concave portion 34d is a substantially cylindrical concave portion, and at least more than half of the corresponding protrusion 42 is formed so as to be able to fit with a certain amount of play. These concave portions 34d are formed offset from the axis 32A of the pin member 32. Therefore, the pin member 32 can be suitably rotated by the rotary tool 40.

[0040] Hereinafter, regarding the joint structure 10 having the above configuration, some of its features and effects will be described.

[0041] The joint structure 10 includes an outer joint member 16 and an inner joint member 18 that are relatively movable with respect to each other and are overlapped at a predetermined position. The outer through hole 22 formed in the outer joint member 16 and the inner through hole 24 formed in the inner joint member 18 form a fitting hole 26 continuously in the overlapping direction when the outer joint member 16 and the inner joint member 18 are located at the predetermined position. Further, the joint structure 10 includes a female screw member 28 provided on the side of the inner joint member 18 opposite to the outer joint member 16. The female screw member 28 has a female screw hole 30 with an inner diameter smaller than the inner diameters of the outer through hole 22 and the inner through hole 24. Furthermore, the joint structure 10 includes a pin member 32 that is a connecting member. The pin member 32 has a fitting portion 34 that is fitted into the fitting hole 26 across the outer through hole 22 and the inner through hole 24 and a male screw portion 36 that is continuous with the fitting portion 34. The male screw portion 36 is configured to be screwable into the female screw hole 30. Therefore, according to the joint structure 10, the outer joint member 16 and the inner joint member 18 are positioned at the predetermined position, the fitting hole 26 is formed by the corresponding outer and inner through holes 22, 24, the pin member 32 is fitted into the fitting hole 26 from the side of the outer joint member 16, and the male screw portion 36 of the pin member 32 is screwed into the female screw hole 30 of the female screw member 28, so that the outer joint member 16 and the inner joint member 18 can be easily connected. In this way, for example, connection using fewer parts can be achieved without using a key member. And since the fitting portion 34 of the pin member 32 is fitted across the outer through hole 22 and the inner through hole 24, displacement of the outer joint member 16 and the inner joint member 18 by the pin member 32, such as initial slip, can be surely prevented, and the outer joint member 16 and the inner joint member 18 can be more surely connected.

[0042] And in the joint structure 10, the fitting portion 34 of the pin member 32 has a circumferential side surface 34b which is an example of a tapered side surface approaching the axis 32A of the pin member 32 as it advances from the fitting portion 34 side toward the male screw portion 36 side. On the other hand, the fitting hole 26 formed by the outer through hole 22 and the inner through hole 24 is formed in a tapered shape having substantially the same inclination as the circumferential side surface 34b of the fitting portion 34 of the pin member 32. Thereby, by fitting the pin member 32 into the fitting hole 26, as the screwing of the pin member 32 progresses, the inner side surfaces of the through holes 22 and 24 are pressed against the circumferential side surface 34b of the pin member 32, and the two joint members 16 and 18 move relatively in the direction in which the central positions of the two through holes 22 and 24 coincide, so that the positions of the two through holes 22 and 24 can be more accurately aligned and a more continuous arrangement can be achieved. Therefore, the positioning of the outer and inner joint members 16 and 18 can be performed more suitably. Further, thereby, displacement of the outer and inner joint members 16 and 18, for example, initial slip can be more reliably prevented, and the joint members 16 and 18 can be more reliably connected.

[0043] Here, for example, in FIG. 9 showing a part of the joint structure 10, when a force in the pipe axis direction acts on one steel pipe, that is, the steel pipe members 12 and 14, as schematically indicated by arrows around the pin member 32, that is, when a force in the sliding direction acts on the outer joint member 16 and the inner joint member 18, an explanation will be given. More specifically, in the example shown in FIG. 9, as indicated by the arrows in the figure, the outer joint member 16 and the inner joint member 18 are receiving a force in the direction of moving away from each other vertically. Therefore, the fitting portion 34 side of the pin member 32 is pulled toward the steel pipe member 12 side having the outer joint member 16, and the male screw portion 36 side of the pin member 32 is pulled toward the steel pipe member 14 side having the inner joint member 18. As a result, a moment M that rotates around a certain point, for example, around the point P on the axis 32A, acts on the pin member 32. This moment M is more firmly received and thus reduced due to the fitting portion 34 of the pin member 32 having a tapered side surface, more specifically having a circumferential side surface 34b of a tapered shape, and the pin member 32 being configured as a tapered pin. More specifically, since the fitting portion 34 of the pin member 32 is formed in a tapered shape and the corresponding fitting hole 26 is also substantially formed in a tapered shape, it is more firmly received due to the mutual relationship between the circumferential side surface 34b of the pin member 32 and the inner surfaces of the through holes 22 and 24, and thus is reduced. Therefore, the joint structure 10 having such a pin member 32 can have higher moment resistance compared to the case where the fitting portion 34 of the pin member 32 does not have a tapered side surface.

[0044] Also, when the outer joint member 16 and the inner joint member 18 are located at predetermined positions and the pin member 32 is screwed into the female screw member 28, the end surface 34a of the fitting portion 34 of the pin member 32 substantially coincides with the outer surface 16o of the outer joint member 16. Thereby, it is possible to more reliably prevent the pin member 32 from protruding outside the outer joint member 16 and interfering with other operations.

[0045] Furthermore, the female screw member 28 is welded and joined to the inner joint member 18. Therefore, the female screw member 28 can be easily provided on the inner joint member 18 at a location other than the construction site, for example, at a factory. Also, this can enhance the water-stopping effect around the female screw member 28 and further enhance the anti-rotation effect of the female screw member 28 when attaching the pin member 32 which is a connecting member.

[0046] Also, when the outer joint member 16 and the inner joint member 18 are positioned at predetermined positions and the pin member 32 is screwed into the female screw member 28, the stepped portion 34c between the fitting portion 34 of the pin member 32 and the male screw portion 36 abuts against the female screw member. Therefore, by screwing the pin member 32 until the stepped portion 34c abuts against the female screw member 28, the outer joint member 16 and the inner joint member 18 can be connected, and the workability can be further enhanced.

[0047] Also, the pin member 32 is provided with a tool engagement concave portion 34d on the end face 34a of the fitting portion 34 of the pin member 32, and this tool engagement concave portion 34d is formed offset from the axis 32A of the pin member 32. Thereby, the tool 40 can be engaged with the tool engagement concave portion 34d to rotate the pin member 32 to suitably connect the two joint members 16, 18. And since the engaging portion of the tool 40 is the concave portion 34d, when the outer joint member 16 and the inner joint member 18 are connected, the protrusion of the pin member 32 from the outer joint member 16 can be more reliably reduced or eliminated.

[0048] And in the above embodiment, the outer joint member 16 connected to the steel pipe 12 is cylindrical, the inner joint member 18 connected to the steel pipe 14 is cylindrical, and when the outer joint member 16 and the inner joint member 18 are positioned at predetermined positions, the inner joint member 18 is fitted inside the outer joint member 16, and the joint structure 10 is used for connecting these joint members 16, 18. Thus, the joint structure 10 can be suitably used for connecting the steel pipes 12, 14.

[0049] The joint structure 10 according to the above-described embodiment has been described by taking as an example its use for connecting steel pipes 12 and 14. However, it can be applied to the connection between steel pipes used for steel pipe piles or steel sheet piles, steel pipes for pipe roof methods, column materials for buildings, and pipes used for water pipelines, etc. Further, the joint structure according to the present disclosure may be used for connection with SC piles or concrete piles. Further, the joint structure according to the present disclosure may be used for connection between a steel pipe portion and a spiral blade portion of a spiral steel pipe having a spiral blade for excavation at the tip used for a rotary jacking pile. In particular, in the case of a spiral steel pipe, it can be efficiently transported by transporting the spiral blade portion and the steel pipe portion separately, while at the construction site, both can be connected in a short period of time and easily.

[0050] Further, in the above-described embodiment, an example in which the joint members 16 and 18 are formed in a cylindrical shape has been described. However, these joint members may be in a square tube shape or may be formed in a flat plate shape.

[0051] As described above, the typical embodiments of the present disclosure have been described. However, the present disclosure is not limited thereto, and various modifications are possible. Various substitutions and changes are possible without departing from the spirit and scope of the present disclosure defined by the claims of the present application.

Description of Reference Numerals

[0052] 1 Steel pipe 10 Joint structure 12, 14 Steel pipe materials 16 Outer joint member (first joint member) 18 Inner joint member (second joint member) 22 Outer through hole (first through hole) 24 Inner through hole (second through hole) 26 Embedding hole 28 Female screw member 30 Female screw hole 32 Pin member (connection member) 34 Embedding portion 36 Male screw portion 40 Rotating tool

Claims

1. A first joint member and a second joint member that are relatively movable with respect to each other and are overlapped at a predetermined position, wherein a first through hole formed in the first joint member and a second through hole formed in the second joint member form a continuous fitting hole in the overlapping direction when the first joint member and the second joint member are located at the predetermined position, the first joint member and the second joint member, A female screw member provided on the side of the second joint member opposite to the first joint member, the female screw member having a female screw hole with an inner diameter smaller than the inner diameters of the first through hole and the second through hole, A connecting member having a fitting portion fitted into the fitting hole across the first through hole and the second through hole and a male screw portion continuous with the fitting portion, the male screw portion being configured to be screwable into the female screw hole, the connecting member comprising A joint structure.

2. The fitting portion of the connecting member has a tapered side surface that approaches the axis of the connecting member as it advances from the fitting portion side toward the male screw portion side. The joint structure according to claim 1.

3. When the first joint member and the second joint member are located at the predetermined position and the connecting member is screwed into the female screw member, an end surface of the fitting portion of the connecting member substantially coincides with an outer surface of the first joint member. The joint structure according to claim 1.

4. The female screw member is welded to the second joint member. The joint structure according to claim 1.

5. When the first joint member and the second joint member are located at the predetermined position and the connecting member is screwed into the female screw member, a stepped portion between the fitting portion and the male screw portion of the connecting member abuts against the female screw member. The joint structure according to claim 1.

6. The connecting member includes a recess for tool engagement on an end surface of the fitting portion. The recess for tool engagement is formed offset from the axis of the connecting member. The joint structure according to claim 1.

7. The first joint member is cylindrical, and the second joint member is cylindrical. When the first joint member and the second joint member are located at the predetermined position, the second joint member is fitted inside the first joint member. The joint structure according to any one of claims 1 to 6.

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