Steel pipe connection device and steel pipe connection method including the same

Abstract

To provide a steel pipe connection device which facilitates connection work of steel pipes, and which can improve work efficiency at a construction site.SOLUTION: A mechanical type steel pipe connection device includes: a box joint 1 provided at one of steel pipe end parts opposing to each other of steel pipes S1, S2 adjacent to each other in the axial direction X; a pin joint 2 provided at the other steel pipe end part; and a rod-like rotation suppression member 4 for connecting the box joint 1 and the pin side joint 2 fitted in with each other in a whirl-stop state. One of both joints 1, 2 includes a holding hole 126 bored along the axial direction and for holding a first end part 41 of the rotation suppression member 4. The other of both joints 1, 2 includes a storage recess part 233 opposing to and communicated with the holding hole 126 in the axial direction X when both joints 1, 2 are fitted with each other, and for storing a second end part 42 of the rotation suppression member 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a steel pipe connecting device used to connect steel pipes that constitute a steel pipe pile. [Background technology]

[0002] One known example of the above-mentioned steel pipe connecting device is a mechanical type that prevents relative rotation between the box joint and pin joint when they are fitted together by arranging a rotation-prevention key with a roughly rectangular cross-section in a notched recess provided at a position spanning the outer surface of the box joint welded to one steel pipe end and the outer surface of the pin joint welded to the other steel pipe end, thereby connecting steel pipes in an anti-rotation state (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-319874 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of the steel pipe connecting device of Patent Document 1, at the construction site where the steel pipe pile is to be buried, it is necessary to attach the rotation prevention key to the notched recess and fix it with bolts, nuts, etc., which causes the problem that the work of connecting the steel pipes at the construction site is time-consuming and the work efficiency is low.

[0005] Furthermore, in the case of the steel pipe connecting device of Patent Document 1, the bolt for fixing the rotation prevention key to the notched recess may protrude outward beyond the outer circumferential surface of the joint. When construction is performed using a construction machine (such as a full-circle rotary pile driver) that clamps the outer periphery of the steel pipe pile and rotates it while pressing it into the ground, construction must be carried out carefully so that the construction machine is not damaged by contact with the protruding part, which leads to reduced work efficiency.

[0006] Furthermore, in the case of the steel pipe connecting device of Patent Document 1, if the bolt for fixing the rotation prevention key is damaged by impact during installation, the rotation prevention key may fall out, compromising the safety of the installation.

[0007] The present invention has been made in consideration of the above-mentioned situation, and aims to provide a steel pipe connection device that can facilitate steel pipe connection work and improve work efficiency and construction safety at construction sites, and a steel pipe connection method using said steel pipe connection device. [Means for solving the problem]

[0008] In order to achieve the above object, the steel pipe connecting device according to the present invention comprises: A box joint is provided at one of the opposing steel pipe ends of the steel pipes adjacent to each other in the axial direction; A pin joint provided at the other steel pipe end and capable of being fitted into the box joint; A mechanical steel pipe connection device comprising: a rod-shaped rotation suppression member that is disposed across the box joint and the pin joint that are fitted to each other and connects the box joint and the pin joint in a rotation-preventing state; one of the box joint and the pin joint has a retaining hole drilled along the axial direction to retain a first end of the rotation inhibiting member, The other of the box joint and the pin joint is characterized in that it has an accommodating recess that communicates with and faces the retaining hole in the axial direction when the box joint and the pin joint are engaged with each other and that accommodates a second end of the rotation preventing member.

[0009] In the steel pipe connecting device, the rod-shaped rotation suppressing member is configured so that its first end can be held in a holding hole drilled in either the box joint or the pin joint. Therefore, if the first end of the rotation suppressing member is held in the holding hole before the steel pipe with the joint welded is transported to the construction site (for example, in a factory where the work of welding the joint to the steel pipe is performed), at the construction site, it becomes possible to insert the second end of the rotation suppressing member toward the receiving recess provided in the other of the box joint or the pin joint while fitting the box joint and the pin joint to each other. In other words, according to the steel pipe connecting device configured as above, fitting the box joint and the pin joint and disposing the rotation suppressing member at a position straddling these joints can be performed in a single process.

[0010] In contrast, in the case of a conventional steel pipe connecting device as shown in Patent Document 1, to connect steel pipes in a rotation-preventing state, it is necessary to carry out at least the steps of fitting the box joint and the pin joint together, attaching the rotation prevention key to the notched recess, and fixing the rotation prevention key with bolts, nuts, etc. so that it does not fall out. Thus, compared to conventional steel pipe connecting devices, the steel pipe connecting device of the present invention simplifies the work required to connect steel pipes in a rotation-preventing state, improving work efficiency at the construction site.

[0011] In addition, the steel pipe connecting device of the present invention does not have any protrusions that protrude outward beyond the outer peripheral surface of the joint and that would interfere with construction machinery, making installation by construction machinery easy and avoiding a decrease in work efficiency.

[0012] Furthermore, in the steel pipe connection device of the present invention, the radial movement of the rotation prevention member is restricted by the wall of the retaining hole, so there is no need to use a separate member to fix the rotation prevention member to prevent it from falling off. Therefore, there is no risk of the rotation prevention member falling off due to damage to the separate member, thereby compromising the safety of installation.

[0013] In the steel pipe connecting device according to the present invention, When the accommodating recess is provided in the pin joint, the accommodating recess opens to an outer peripheral surface or an inner peripheral surface of the pin joint, When the accommodating recess is provided in the box joint, it is preferable that the accommodating recess opens onto an outer circumferential surface or an inner circumferential surface of the box joint.

[0014] In the case of an accommodating recess that opens onto the outer peripheral surface of the joint, a worker at the construction site can visually check the position of the accommodating recess from the outer peripheral side of the joint. Therefore, when inserting the other end of the rotation suppressing member toward the accommodating recess while fitting the box joint and the pin joint together, it becomes easy to align the other end of the rotation suppressing member with the accommodating recess, thereby improving work efficiency at the construction site.

[0015] In addition, in the case of an accommodating recess that opens onto the outer peripheral surface of the joint, the accommodating recess can be formed by machining from the radially outward side of the joint. Compared to an accommodating recess that does not open onto the outer peripheral surface of the joint and must be machined from the axial direction of the joint using a long cutting tool, an accommodating recess that opens onto the outer peripheral surface of the joint is easier to machine and the time required for machining can be shortened.

[0016] Furthermore, due to vibrations during installation, the other end of the rotation suppressing member in the recess may come into contact with the wall of the recess not only in the circumferential direction of the joint but also in the radial direction, and each time this occurs, a bending moment that can cause fatigue failure acts on the rotation suppressing member, but in the case of a recess that opens onto the outer circumferential surface of the joint, the absence of some of the wall reduces the probability of contact occurring, and fatigue failure is prevented. The same can be said for a recess that opens onto the inner circumferential surface of the joint.

[0017] In the steel pipe connecting device according to the present invention, the accommodating recess has a bearing wall portion that abuts against the second end portion of the rotation suppressing member in a relative rotation direction between the box joint and the pin joint, It is preferable that the second end of the rotation restricting member is formed in a shape capable of abutting in surface contact with the bearing wall portion.

[0018] In the case of surface contact, the force acting thereon is dispersed more than in the case of point contact or line contact. According to the above-mentioned configuration, when the rotation torque is transmitted through the rotation suppressing member, it is possible to prevent the force acting on the bearing wall portion of the accommodating recess and the second end portion of the rotation suppressing member from concentrating locally, thereby preventing deformation or damage.

[0019] In the steel pipe connecting device according to the present invention, It is preferable that the dimension of the accommodating recess in the axial direction be smaller than the dimension of the rotation restricting member in the longitudinal direction.

[0020] In the case where the upper joint of the box joint and the pin joint is provided with a retaining hole and the lower joint of the box joint and the pin joint is provided with a storage recess, if the retaining force of the retaining hole weakens due to some reason (such as vibration during installation), the rotation suppressing member may fall into the storage recess. According to the above-mentioned configuration of the present invention, even if the rotation suppressing member falls into the storage recess, the entire rotation suppressing member will not be buried in the storage recess, and the upper end of the rotation suppressing member will be exposed from the storage recess. As long as at least a part of the upper end of the rotation suppressing member is positioned within the retaining hole, the movement of the rotation suppressing member in the radial direction of the joint is restricted, and the rotation suppressing member is prevented from falling out of the joint.

[0021] In the steel pipe connecting device according to the present invention, A female screw is formed on the inner wall of the retaining hole, It is preferable that at least the first end of the rotation restricting member is formed with a male thread that can be screwed into the female thread.

[0022] According to the above-described configuration, the rotation restricting member can be reliably held in the holding hole with a simple structure.

[0023] The steel pipe connecting method according to the present invention, in which steel pipes are connected to each other using the above-mentioned steel pipe connecting device, is as follows: a step of arranging the box joint provided on one steel pipe and the pin joint provided on the other steel pipe adjacent to each other in the axial direction; a step of aligning the rotation restricting member, the first end of which is held in the holding hole, and the accommodating recess so as to face each other in the axial direction; and inserting the second end of the rotation restricting member into the accommodating recess while engaging the box joint and the pin joint with each other.

[0024] According to the steel pipe connecting method of the present invention, the fitting of the box joint and the pin joint, and the installation of the rotation prevention member in a position spanning these joints are carried out in a single process, thereby improving work efficiency at the construction site. [Brief description of the drawings]

[0025] [Figure 1] 1 is a diagram showing a schematic configuration of a steel pipe pile equipped with a steel pipe connecting device according to the present invention. FIG. [Diagram 2] FIG. 2 is a diagram illustrating a steel pipe connecting operation using a steel pipe connecting device. [Diagram 3] FIG. 11 is a diagram showing a schematic configuration of another embodiment of a steel pipe connecting device. [Figure 4] FIG. 11 is a diagram showing a schematic configuration of another embodiment of a steel pipe connecting device. [Diagram 5] FIG. 11 is a diagram showing a schematic configuration of another embodiment of a steel pipe connecting device. [Figure 6] FIG. 11 is a diagram showing a schematic configuration of another embodiment of a steel pipe connecting device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, an embodiment of a steel pipe connecting device and a steel pipe connecting method according to the present invention will be described with reference to the drawings.

[0027] As shown in Figures 1 and 2, the steel pipe connection device J is used to connect the opposing ends of steel pipes S1 and S2 that are adjacent to each other in the steel pipe axial direction X (which in this embodiment is the same direction as the up-down direction) to form a steel pipe pile P, and is equipped with a box joint 1, a pin joint 2, a load transmission key 3, and a rotation suppression member 4.

[0028] The box joint 1 is manufactured by processing a steel pipe and has a base 11 that is connected to the end of the steel pipe S1 by welding or the like and has approximately the same diameter as the outer diameter of the steel pipe S1, an inserted portion 12 that extends from the base 11 and has a diameter approximately larger than the outer diameter of the steel pipe S1, and a box side engagement portion 13 that is provided around the entire inner circumference of the end of the inserted portion 12 on the base 11 side.

[0029] The pin joint 2 is manufactured by processing a steel pipe and has a base 21 that is connected to the end of the steel pipe S2 by welding or the like and has approximately the same diameter as the outer diameter of the steel pipe S2, an insertion portion 22 that extends from the base 21 and has a diameter approximately smaller than the outer diameter of the steel pipe S1 and can be inserted into the inserted portion 12 of the box joint 1, and a pin side engagement portion 23 that is provided around the entire outer periphery of the end of the insertion portion 22 on the base 21 side.

[0030] The inserted portion 12 of the box joint 1 is configured such that its tip portion (lower end portion) can engage with the pin side engaging portion 23 of the pin joint 2. Specifically, at the tip portion of the inserted portion 12 of the box joint 1, a joint surface 121 is formed on the outer periphery, and an engaging protrusion 122 is provided on the inner periphery, protruding from the joint surface 121. On the other hand, at the tip portion (upper end portion) of the pin side engaging portion 23 of the pin joint 2, a joint surface 231 is formed on the outer periphery, which constitutes the outer periphery side seam 51 together with the joint surface 121 of the inserted portion 12, and an engaging recess 232 into which the engaging protrusion 122 of the inserted portion 12 is inserted is provided on the inner periphery, recessed from the joint surface 231, over the entire periphery.

[0031] The insert portion 22 of the pin joint 2 is configured such that its tip portion (upper end portion) can engage with the box side engaging portion 13 of the box joint 1. Specifically, at the tip portion of the insert portion 22 of the pin joint 2, a joint surface 221 is formed over the entire circumference on the inner periphery side, and an engaging protrusion 222 is protruding from the joint surface 221 over the entire circumference on the outer periphery side. On the other hand, at the tip portion (lower end portion) of the box side engaging portion 13 of the box joint 1, a joint surface 131 that constitutes an inner periphery side seam 52 together with the joint surface 221 of the insert portion 22 is formed over the entire circumference on the outer periphery side, and an engaging recess 132 into which the engaging protrusion 222 of the insert portion 22 is inserted is recessed from the joint surface 131 over the entire circumference.

[0032] The fitted-in portion 22 of the pin joint 2 is fitted into the fitted-in portion 12 of the box joint 1, and the tip of the fitted-in portion 22 engages with the box side engaging portion 13 and the tip of the fitted-in portion 12 engages with the pin side engaging portion 23, thereby fitting the box joint 1 and the pin joint 2 together. Note that at this time, the box joint 1 and the pin joint 2 are separable along the axial direction X, and are relatively rotatable around the axial direction X.

[0033] The load transmission key 3 is a member for connecting the separable box joint 1 and pin joint 2 in a state where they are prevented from coming off. An inward groove 123 is formed along the circumferential direction on the inner peripheral surface of the fitted-inserted portion 12 of the box joint 1, and, as an example, eight load transmission keys 3 are arranged at intervals in the inward groove 123. By operating a set bolt 125 screwed into a bolt hole 124 communicating with the inward groove 123, each load transmission key 3 is pushed out to a position where it straddles an outward groove 223 formed on the outer peripheral surface of the fitted-inserted portion 22 of the pin joint 2 so as to face the inward groove 123, the box joint 1 and the pin joint 2 are connected in a state where they are prevented from coming off.

[0034] The rotation inhibiting member 4 is a member for connecting the box joint 1 and the pin joint 2, which are capable of relative rotation, in a rotation-preventing state. In this embodiment, a bolt having a male thread cut along its entire length (e.g., a hexagonal socket stud bolt) is used as the rotation inhibiting member 4. In the following description, the rotation inhibiting member 4 may be referred to as a bolt. The number of bolts 4 can be set according to the rotational torque applied to the steel pipe pile P, and as an example, four bolts 4 can be used.

[0035] At the tip of the inserted portion 12 of the box joint 1, retaining holes 126 are drilled along the axial direction X (strictly speaking, a direction parallel to this), with female threads cut into the inner wall thereof so as to be engageable with the male threads of the rotation suppression member 4. The number of retaining holes 126 is set corresponding to the number of bolts 4, and when four bolts 4 are used, four retaining holes 126 are provided at intervals in the circumferential direction of the inserted portion 12.

[0036] Meanwhile, an accommodating recess 233 is provided at the tip of the pin side engaging portion 23 of the pin joint 2 at a position corresponding to the installation location of the retaining hole 126 in the inserted portion 12 of the box joint 1 so as to open towards the inserted portion 12. As a result, when the box joint 1 and the pin joint 2 are fitted together and the accommodating recess 233 is opposed to the retaining hole 126, the accommodating recess 233 communicates with the retaining hole 126. The accommodating recess 233 is formed so as to be able to accommodate an end of the bolt 4, and the dimension L of the accommodating recess 233 in the axial direction X is shorter than the dimension of the bolt 4 in the longitudinal direction.

[0037] In this embodiment, the accommodating recess 233 is configured by a groove that also opens into the outer circumferential surface of the pin joint 2. Such an accommodating recess 233 can be formed, for example, by cutting the pin joint 2 by advancing a tool such as a cutting tool from the radial outside of the pin joint 2. The accommodating recess 233 has two bearing walls 234 that face each other in the circumferential direction of the pin joint 2 for contacting the bolt 4, as will be described later. In this embodiment, the wall surface of the bearing walls 234 is flat.

[0038] 1, the bolt 4 is disposed across the fitted box joint 1 and pin joint 2 with a first end 41 screwed and held in the retaining hole 126 of the box joint 1 and a second end 42 housed in the accommodating recess 233 of the pin joint 2. As a result, when a rotational torque is applied to either the box joint 1 or the pin joint 2, the rotational torque is transmitted to the other of the box joint 1 and the pin joint 2 via the abutment between the second end of the bolt 4 and the bearing wall portion 234 of the accommodating recess 233, so that the box joint 1 and the pin joint 2 are connected in a non-rotational state.

[0039] In the embodiment shown in Figs. 1 and 2, the rotational torque is transmitted by the cylindrical rotation suppressing member 4 abutting against the support wall 234 whose wall surface is flat, but the present invention is not limited to this. The second end 42 of the rotation suppressing member 4 accommodated in the accommodation recess 233 and the support wall 234 may be formed in a shape that allows them to abut against each other in surface contact. For example, as in the embodiment shown in Fig. 3, the second end 42 of the rotation suppressing member 4 accommodated in the accommodation recess 233 may be formed in a prismatic shape so that it can abut against the support wall 234 whose wall surface is flat in surface contact. That is, the rotation suppressing member 4 in this embodiment has a cylindrical first end 41 and a prismatic second end 42. Note that, as the prismatic column, a square column having four side faces as shown in Fig. 3 may be used, but is not limited thereto, and a square column having three or five or more side faces may be used. Alternatively, in embodiments not shown, the wall surface of the support wall portion 234 may be formed cylindrically so as to be able to abut in surface contact with the cylindrical second end portion 42 of the rotation inhibiting member 4. In these embodiments, the abutment surface (i.e., the support surface) between the rotation inhibiting member 4 and the support wall portion 234 becomes wider, thereby preventing damage to the rotation inhibiting member 4 or the support wall portion 234 due to the abutment.

[0040] At a construction site, steel pipes are connected using the steel pipe connecting device J according to the present invention as follows. In a first step, a steel pipe S1 having a box joint 1 provided at its lower end is moved by a crane or the like above a steel pipe S2 having a pin joint 2 provided at its upper end, so that the box joint 1 and the pin joint 2 are adjacent to each other in the axial direction X. Note that the first end 41 of the bolt 4 is held in advance within the holding hole 126 of the box joint 1 before the steel pipe S1 is transported to the construction site.

[0041] In a second step, the steel pipe S1 is rotated appropriately to align the bolt 4 on the box joint 1 side and the accommodating recess 233 on the pin joint 2 side so that they generally face each other in the axial direction X.

[0042] 2, in the third step, the steel pipe S1 is lowered to fit the box joint 1 and the pin joint 2 together, while the second end of the bolt 4 on the box joint 1 side is inserted into the accommodating recess 233 on the pin joint 2 side. This allows the box joint 1 and the pin joint 2 to be connected in a non-rotational state.

[0043] In a fourth step, the load transmission key 3 is pushed out to a position spanning the inward groove portion 123 and the outward groove portion 223 by operating the set bolt 125. This connects the box joint 1 and the pin joint 2 in a non-disconnectable state.

[0044] The first step and the second step may be performed simultaneously. That is, the steel pipe S1 may be moved above the steel pipe S2 while being appropriately rotated to align the bolt 4 with the accommodating recess 233. Alternatively, the second step and the third step may be performed simultaneously. That is, the steel pipe S1 may be lowered while being appropriately rotated, and the second end of the bolt 4 may be inserted toward the accommodating recess 233.

[0045] A steel pipe pile P constructed using the steel pipe connecting device J according to the present invention can be used regardless of the construction method, but is preferably used in a construction method in which a relatively low or no rotational torque is applied to the steel pipe pile (e.g., driving method) in order to avoid the risk of breakage of the rod-shaped rotation restraining members 4. However, by using a rotation restraining member 4 with higher strength or by increasing the number of rotation restraining members 4, it becomes possible to transmit the rotational torque without worrying about breakage, so the steel pipe connecting device J according to the present invention may be used to construct a steel pipe pile P for use in a construction method in which a relatively high rotational torque is applied (e.g., rotary press-in method).

[0046] [Another embodiment] (1) In the embodiment described above, the accommodating recess 233 of the pin joint 2 is configured as a groove that also opens into the outer circumferential surface of the pin joint 2, but the present invention is not limited to this. The accommodating recess may be configured as a hole that does not open into the outer circumferential surface of the pin joint 2 and opens only toward the inserted portion 12 of the box joint 1. In this case, the second end of the rotation suppressing member 4 inserted into the accommodating recess is also restricted from moving in the radial direction of the joint by the wall of the accommodating recess, so that the rotation suppressing member 4 is more effectively prevented from falling off from the joint.

[0047] (2) In the embodiment described above, the retaining hole 126 is provided on the box joint 1 side, and the accommodating recess 233 is provided on the pin joint 2 side, but the present invention is not limited to this. For example, as shown in Fig. 4, a retaining hole may be provided in the pin-side engaging portion 23 of the pin joint 2, and an accommodating recess may be provided at the tip of the inserted portion 12 of the box joint 1. In this case, the bolt 4 is disposed in such a manner that the second end 42 of the bolt 4 is inserted into the accommodating recess of the box joint 1 while the box joint 1 is being fitted into the pin joint 2, with the first end 41 of the bolt 4 being screwed and held in the retaining hole of the pin joint 2 before fitting.

[0048] (3) In the above-described embodiment, the retaining hole 126 is provided in the fitted portion 12 located on the outer periphery side of the box joint 1, and the accommodating recess 233 is provided in the pin side engaging portion 23 located on the outer periphery side of the pin joint 2, but the present invention is not limited to this. For example, as shown in FIG. 5, a retaining hole may be provided in the box side engaging portion 13 located on the inner periphery side of the box joint 1, and an accommodating recess may be provided in the fitted portion 22 located on the inner periphery side of the pin joint 2. Alternatively, as shown in FIG. 6, a retaining hole may be provided in the fitted portion 22 located on the inner periphery side of the pin joint 2, and an accommodating recess may be provided in the box side engaging portion 13 located on the inner periphery side of the box joint 1. Note that even in these embodiments, the accommodating recess may or may not open to the inner periphery surface of the joint.

[0049] (4) In the above-described embodiment, a fully threaded bolt having the same diameter over its entire length was used as the rotation inhibiting member 4, but the present invention is not limited to this. The rotation inhibiting member 4 may be a bolt having a male thread only on the first end 41 that screws into the retaining hole 126. Furthermore, the rotation inhibiting member 4 may be a member (e.g., a headed bolt) in which the second end 42 that is inserted into the accommodating recess 233 has a larger diameter than the first end 41 that screws into the retaining hole 126.

[0050] (5) In the above-described embodiment, the rotation restricting member 4 is held in the holding hole 126 by screwing, but the present invention is not limited to this. The rotation restricting member 4 may be held in the holding hole 126 by means of adhesive, magnets, welding, fitting, engagement, or other means. [Explanation of symbols]

[0051] 1: Box joint 11: Base 12: Fitted insertion part 121: Joint surface 122: Engagement convex part 123: Inward groove 124: Bolt hole 125: Set bolt 126: Retaining hole 13: Box side engagement part 131: Joint surface 132: Engagement recess 2: Pin joint 21: Base 22: Insertion part 221: Joint surface 222: Engagement convex part 223: Outward groove 23: Pin side engagement part 231: Joint surface 232: Engagement recess 233: Storage recess 234: Bearing wall 3: Load transmission key 4: Rotation prevention member 41: First end 42: Second end 51: Outer circumference joint 52: Inner circumference seam J: Steel pipe connection device P: Steel pipe pile S1: Steel pipe S2: Steel pipe X: Axial direction

Claims

1. A box joint is provided at one of the opposing steel pipe ends of the steel pipes adjacent to each other in the axial direction; A pin joint provided at the other steel pipe end and capable of being fitted into the box joint; a rod-shaped rotation suppression member that is disposed across the box joint and the pin joint that are fitted together and connects the box joint and the pin joint in a rotation-preventing state; one of the box joint and the pin joint has a retaining hole drilled along the axial direction to retain a first end of the rotation inhibiting member, A mechanical steel pipe connecting device, wherein the other of the box joint and the pin joint has an accommodating recess that communicates with and faces the retaining hole in the axial direction when the box joint and the pin joint are fitted together, and that accommodates a second end of the rotation restraint member.

2. When the accommodating recess is provided in the pin joint, the accommodating recess opens to an outer peripheral surface or an inner peripheral surface of the pin joint, The steel pipe connecting device according to claim 1 , wherein when the accommodating recess is provided in the box joint, the accommodating recess opens onto an outer peripheral surface or an inner peripheral surface of the box joint.

3. the accommodating recess has a bearing wall portion that abuts against the second end portion of the rotation suppressing member in a relative rotation direction between the box joint and the pin joint, 3. The steel pipe connecting device according to claim 1 or 2, wherein the second end of the rotation preventing member is formed into a shape capable of abutting the support wall portion in surface contact.

4. 3. The steel pipe connecting device according to claim 1, wherein a dimension of the accommodating recess in the axial direction is smaller than a dimension of the rotation inhibiting member in the longitudinal direction.

5. A female screw is formed on the inner wall of the retaining hole, 3. The steel pipe connecting device according to claim 1, wherein at least the first end of the rotation preventing member is formed with a male thread that can be screwed into the female thread.

6. A steel pipe connecting method for connecting steel pipes to each other using the steel pipe connecting device according to claim 1, a step of arranging the box joint provided on one steel pipe and the pin joint provided on the other steel pipe adjacent to each other in the axial direction; a step of aligning the rotation restricting member, the first end of which is held in the holding hole, and the accommodating recess so as to face each other in the axial direction; and inserting a second end of the rotation restraint member into the accommodating recess while fitting the box joint and the pin joint together.

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