JP2018044388A - Steel pipe coupling mechanism and steel pipe coupling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel pipe connecting mechanism and a steel pipe connecting method having good workability when disposing a split key member in a key groove portion. Kind Code: A1 A steel pipe connecting mechanism for connecting mutually opposed steel pipe ends of steel pipes adjacent to each other in a steel pipe axial direction by a key member so as to prevent the steel pipe from coming off in the steel pipe axial direction, wherein the key member is a steel pipe circumferential direction. The split key member 31 includes a plurality of split key members 31. The split key member 31 is provided with a connecting mechanism capable of connecting the split key members 31 adjacent to each other at both ends of the split key member 31 in the longitudinal direction. The longitudinal dimension L along the longitudinal direction which is shorter than the lateral dimension H along the circumferential direction of the steel pipe of the opening 16 communicating with the key groove portion G in which the member 31 is arranged and which is longer than the depth dimension of the opening 16 is set. Have. [Selection diagram] Fig. 3

Description

  The present invention relates to a steel pipe coupling mechanism or the like for coupling steel pipe end portions of steel pipes adjacent to each other in the steel pipe axial direction in a retaining state in the steel pipe axial direction by a key member.

  Conventionally, as a linkage mechanism that links a plurality of split key members, for example, a structure in which a single wire is simply inserted through the plurality of split key members (see, for example, Patent Document 1).

JP 2009-35931 A

  In the conventional linkage mechanism described above, when the plurality of split key members through which the wires are inserted are arranged in the key groove portion constituted by the inward groove portion and the outward groove portion through the opening formed in the cylindrical joint, Since each split key member rotates relative to each other around the wire and the insertion posture is not fixed, it is difficult to appropriately place the key member in the key groove portion through the opening. Furthermore, in order to send the split key member arranged in the key groove portion along the key groove portion in the circumferential direction of the steel pipe, the length that can reach the split key member arranged in the key groove portion from the outside of the opening is set. There was a problem that a jig to have was necessary.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the steel pipe connection mechanism and steel pipe connection method with sufficient workability | operativity at the time of arrange | positioning a division | segmentation key member in a key groove part.

  In order to achieve the above-mentioned object, the characteristic configuration of the steel pipe coupling mechanism of the present invention is a state in which the steel pipe end portions of the steel pipes adjacent to each other in the steel pipe axial direction are prevented from coming off in the steel pipe axial direction by a key member. The key member is composed of a plurality of split key members in the circumferential direction of the steel pipe, and the split key member is adjacent to both ends in the longitudinal direction of the split key member. A connecting mechanism capable of connecting the members to each other, a width of the opening communicating with the key groove in which the split key member is disposed is shorter than a lateral width along the circumferential direction of the steel pipe, and the depth of the opening It has a longitudinal dimension that is longer than the vertical dimension.

  Since the split key member has a longitudinal dimension shorter than a lateral width dimension along the circumferential direction of the steel pipe of the opening, it can be sequentially disposed in the key groove part through the opening. Furthermore, since the longitudinal dimension of the split key member is longer than the depth dimension of the opening, when the tip of another split key member is connected to the split key member already arranged in the key groove portion via the connecting mechanism. The rear end of the other split key member is located outward from the opening. Therefore, the other divided key member can be used as a jig, and the divided key member already arranged in the key groove portion can be fed in the steel pipe circumferential direction along the key groove portion.

  In the present invention, the connecting mechanism is provided with a projecting portion projecting from the center of one end of the split key member along the longitudinal direction, and a first portion orthogonal to the longitudinal direction provided at the tip of the projecting portion. An axial part having an axial center along the direction and an axial part provided in another split key member can be received from the second direction perpendicular to the longitudinal direction and the first direction, and It is preferable that an accommodation groove portion is provided that accommodates such that engagement / disengagement in a direction along the longitudinal direction is impossible.

  While the divided key member already arranged in the key groove portion is pressed and fed in the steel pipe circumferential direction along the key groove portion by another divided key member, the other divided key member is rotated around the axis of the shaft-like portion. When the other divided key member is rotated and arranged in the key groove portion through the opening, the shaft shape provided in the other divided key member accommodated in the accommodating groove portion provided in the already arranged divided key member The part cannot be engaged / disengaged in the direction along the longitudinal direction of the split key member, and the connection of both split key members is completed.

  In the present invention, the insertion mechanism is provided with a first shaft through-hole projecting along the longitudinal direction from the center of one end of the split key member and extending in the first direction perpendicular to the longitudinal direction. And the other end of the split key member is projected along the longitudinal direction, and a sandwiching portion provided in another split key member can be sandwiched and the sandwiched portion is sandwiched. Sometimes when a sandwiched portion having a second shaft through hole along the first direction at a position corresponding to the first shaft through hole, and when the sandwiched portion is sandwiched in the sandwiched portion It is preferable that a shaft member penetrating the first shaft through hole and the second shaft through hole is provided.

  The sandwiching portion of another split key member is sandwiched in the sandwiched portion provided in the split key member already arranged in the key groove portion, and is provided in the first shaft through hole and the sandwiched portion provided in the sandwiching portion. By connecting the shaft member to the second shaft through hole, the connection of both split key members is completed. As another divided key member is rotated around the axis of the shaft member and inserted into the key groove portion through the opening, the divided key member already arranged in the key groove portion is fed in the circumferential direction of the steel pipe along the key groove portion. .

  In the present invention, the tubular joint provided at one of the steel pipe ends facing each other of the steel pipes adjacent to each other in the axial direction of the steel pipe and the other steel pipe end are provided and can be fitted to the tubular joint. An inward groove provided along the circumferential direction of the steel pipe on the inner surface of the tubular joint of the tubular joint, and the tubular joint and the shaft joint. And an outward groove portion provided on the outer surface of the shaft-shaped joint of the shaft-shaped joint so as to face the inward groove portion along the circumferential direction of the steel pipe, The opening is preferably provided in the cylindrical joint.

  When the tubular joint and the shaft joint are fitted to each other, the split key member is arranged in the key groove portion as described above, so that the shaft joint and the tubular joint are prevented from coming off. Connected to

  In the present invention, the shaft-like joints provided at both ends of the steel pipes facing each other in the steel pipe axially adjacent direction and the shaft-like joints are adjacent to each other, and the shaft-like joints are surrounded by the shaft-like joints. A cylindrical joint that can be installed, and the key groove includes an inward groove provided along a circumferential direction of a steel pipe on a cylindrical joint inner circumferential surface of the cylindrical joint, the cylindrical joint, and the shaft. And an outward groove portion provided on the outer surface of the shaft-like joint of the shaft-like joint so as to face the inward groove portion along the circumferential direction of the steel pipe when they are fitted to each other. The opening is preferably provided in the cylindrical joint.

  When the two-axis joint is inserted in the cylindrical joint, the split key member is arranged in the key groove portion as described above, so that the shaft joint and the cylindrical joint are prevented from coming off. Connected.

  In the present invention, the shaft-like joints provided at both ends of the steel pipes facing each other in the steel pipe axially adjacent direction and the shaft-like joints are adjacent to each other, and the shaft-like joints are surrounded by the shaft-like joints. A cylindrical joint that can be installed, and the key groove includes an inward groove provided along the circumferential direction of the steel pipe on the inner surface of the cylindrical joint of the cylindrical joint, the cylindrical joint, and the When the shaft-like joint is fitted to each other, the outer surface of the shaft-like joint of the shaft-like joint is provided with an outward groove provided to face the inward groove along the steel pipe circumferential direction. Preferably, the tubular joint is configured by a plurality of peripheral wall members in the circumferential direction of the steel pipe, and the opening is provided in at least one peripheral wall member among the plurality of peripheral wall members. .

  When the cylindrical joint is provided around both shaft-shaped joints, the split key member is disposed in the key groove portion as described above, so that the shaft-shaped joint and the cylindrical joint are prevented from coming off. Connected.

  In order to achieve the above-described object, the steel pipe connection method according to the present invention is characterized in that the steel pipe ends adjacent to each other in the steel pipe axial direction are separated from each other by a plurality of divided key members in the steel pipe circumferential direction. A steel pipe connecting method for connecting in a steel tube axial direction in a steel tube axial direction with a configured key member, wherein the split key member is already arranged in the key groove part through an opening communicating with the key groove part in which the key member is arranged. In addition, by connecting another split key member, and pressing the split key member already arranged in the key groove portion along the key groove portion in the circumferential direction of the steel pipe by the other split key member, The other split key member is arranged in the key groove portion.

  According to the above-described configuration, the divided key member already arranged in the key groove portion can be fed in the circumferential direction of the steel pipe along the key groove portion using another divided key member as a jig.

Explanatory drawing which shows a partly cut steel pipe pile before and after being connected by the steel pipe connection mechanism Explanatory drawing of the division key member with which a steel pipe connection mechanism is provided Sectional view enlarging the main part of the steel pipe coupling mechanism Sectional view enlarging the main part of the steel pipe coupling mechanism Explanatory drawing of arrangement of split key member Explanatory drawing of arrangement of split key member Explanatory drawing of arrangement of split key member Explanatory drawing of the division | segmentation key member with which the steel pipe connection mechanism by another embodiment is provided. Explanatory drawing which partially cuts and shows the steel pipe pile before and after connected by the steel pipe connection mechanism by another embodiment Explanatory drawing of arrangement of split key member

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows steel pipe piles P (P1, P2) used in a medium excavation method in which a rotary press-fitting into the ground is performed while excavating with an auger.

  The steel pipe pile P (P1, P2) has a cylindrical joint 10 welded to one end of a steel pipe S (S1, S2) such as a spiral steel pipe, and a shaft joint 20 welded to the other end. Cylinder.

  The steel pipe ends of the steel pipes S (S1, S2) facing each other of the steel pipe piles P (P1, P2) adjacent to each other in the steel pipe axis X direction are retained by the steel pipe coupling mechanism J according to the present invention, and It is connected in a non-rotating state.

  The steel pipe coupling mechanism J includes a tubular joint 10, a shaft joint 20, a load transmission key 30, and a rotation suppression key 40.

  The tubular joint 10 is created by processing a steel tubular body. On the lower end side of the tubular joint 10, there are provided a ridge 11 and a plurality of tube-side notch recesses 12 spaced apart in the circumferential direction of the steel pipe. A groove portion 14 is provided on the upper end side of the inner peripheral surface 13 of the tubular joint 10. The inner peripheral surface 13 in the present embodiment is the cylindrical joint inner peripheral surface according to the present invention. Two inner grooves 15 are provided on the inner circumferential surface 13 along the circumferential direction of the steel pipe.

  The tubular joint 10 is provided with an opening 16 communicating with the inward groove 15 from the outer peripheral surface thereof. The vertical width of the opening 16 is substantially the same as or slightly larger than the vertical width of the key groove.

  The shaft-like joint 20 is created by processing a steel tubular body. On the upper end side of the shaft-like joint 20, a protrusion 21 that can be fitted into the groove 14 provided in the tubular joint 10 is provided.

  When the cylindrical joint 10 and the shaft-shaped joint 20 are fitted to each other, the shaft-side notch recess 22 is provided at a position facing the cylinder-side notch recess 12 provided in the cylindrical joint 10. Yes. The cylinder side cutout recess 12 and the shaft side cutout recess 22 constitute a key groove portion of a rotation suppression key 40 described later. A female screw 26 to which a fixing screw 41 for fixing the rotation suppression key 40 to the key groove portion can be screwed is provided at the central portion of the shaft-side notch recess 22.

  The outer peripheral surface 23 has a length in the steel pipe axis X direction that is substantially the same as the length of the inner peripheral surface 13 of the cylindrical joint 10 in the steel pipe axis X direction, and has an outer diameter that can be fitted to the inner peripheral surface 13. It is configured. The outer peripheral surface 23 in this embodiment is a shaft-shaped joint outer peripheral surface according to the present invention. On the lower end side of the outer peripheral surface 23, a groove portion 24 into which the protrusion 11 provided in the cylindrical joint 10 can be fitted is formed.

  Two outward grooves 25 on the outer circumferential surface 23 face the inward grooves 15 when the tubular joint 10 and the shaft joint 20 are fitted to each other along the circumferential direction of the steel pipe. It is equipped as such.

  When the cylindrical joint 10 and the shaft-shaped joint 20 are fitted to each other, an annular space composed of the inward groove portion 15 and the outward groove portion 25 is a key for placing the load transmission key 30 The groove part G is configured.

  When the cylindrical joint 10 and the shaft-shaped joint 20 are fitted to each other, a lid member 50 described later is fixed to a portion of the outward groove 25 of the shaft-shaped joint 20 that faces the opening 16. A female screw 52 capable of screwing the male screw 51 is provided.

  The load transmission key 30 is a member for connecting the tubular joint 10 and the shaft joint 20 in a retaining state when the tubular joint 10 and the shaft joint 20 are fitted to each other. A plurality of split key members 31 are formed around the axis X.

  As shown in FIGS. 2 and 3, the split key member 31 has an arc-shaped key body portion having a rectangular cross section and an inner circumferential surface of the key facing the bottom surface of the outward groove 25 having substantially the same curvature as the bottom surface. 32, a projecting portion 33 projecting from the center of one end of the key body portion 32 along the longitudinal direction of the key body portion 32, and provided at the tip of the projecting portion 33, along a first direction perpendicular to the longitudinal direction. A shaft-shaped portion 34 having a central axis and a shaft-shaped portion 34 provided on the other end side of the key main body portion 32 and provided in another split key member 31 are perpendicular to the longitudinal direction and the first direction. An accommodation groove portion 35 is provided which can be received from the direction and accommodated so that the split key member 31 cannot be engaged and disengaged in the direction along the longitudinal direction. The split key member 31 is created by processing a long steel body. The first direction is a direction parallel to the steel pipe axis X, and the second direction is a direction perpendicular to the steel pipe axis X and toward the outside of the outer peripheral surface of the tubular joint 10.

  In the present embodiment, the shaft-shaped portion 34 and the accommodation groove portion 35 constitute a connection mechanism C that can connect the divided key members 31 adjacent to each other along the longitudinal direction.

  As shown in FIG. 3, the split key member 31 has a longitudinal dimension L shorter than a lateral width dimension H along the circumferential direction of the steel pipe of the opening 16, and the depth of the opening 16 as shown in FIG. 4. It is longer than the dimension D. The longitudinal dimension L is preferably about 70 to 90% of the lateral width H from the viewpoint of workability. The depth dimension D of the opening 16 refers to the length from the outer surface of the cylindrical joint to the bottom surface of the outward groove 25 provided in the shaft-shaped joint 20.

  A steel pipe connecting method for connecting the tubular joint 10 and the shaft-shaped joint 20 in a retaining state using the plurality of split key members 31 configured as described above will be described. Here, the divided key member 31 to be arranged next in the key groove part G is denoted by reference numeral 31a, and the divided key member 31 already arranged in the key groove part G is denoted by reference numeral 31b.

  As shown in FIGS. 4 and 5, the shaft-like portion 34 of another split key member 31 a is received through the opening 16 into the receiving groove portion 35 provided in the split key member 31 b already arranged in the key groove portion G. .

  As shown in FIG. 6, while the divided key member 31 b is pressed and fed in the steel pipe circumferential direction along the key groove portion G by the divided key member 31 a, the divided key member 31 a is moved around the axis of the shaft-like portion 34. When it is arranged in the key groove portion G through the opening 16 while being rotated, the shaft-like portion 34 provided in the divided key member 31 a accommodated in the accommodation groove portion 35 provided in the divided key member 31 b is formed on the divided key member 31. Engagement / disengagement in the direction along the longitudinal direction becomes impossible, and the connection between the split key member 31a and the split key member 31b is completed.

  In this way, using the split key member 31a as a jig, while pressing the split key member 31b already arranged in the key groove portion G along the key groove portion G in the circumferential direction of the steel pipe, By repeating the arrangement in the key groove portion G, a plurality of divided key members 31 are arranged in the key groove portion G over the circumferential direction of the steel pipe. Thereafter, as shown in FIG. 7, the opening 16 is closed by the lid member 50.

  In fitting the tubular joint 10 and the shaft-shaped joint 20 to each other, the split key member 31 is used as a jig, and the split key member 31 already arranged in the key groove portion G is By repeatedly placing another divided key member 31 in the key groove portion G while pressing in the direction, a plurality of divided key members 31 are disposed in the key groove portion G in the circumferential direction of the steel pipe, and the cylindrical joint 10 And the shaft-like joint 20 are connected in a retaining state.

  In the above-described embodiment, the case where the shaft-like portion 34 and the accommodation groove portion 35 are provided in the coupling mechanism C of the split key member 31 has been described, but the present invention is not limited thereto.

  As shown in FIG. 8, the connecting mechanism C of the split key member 31 protrudes from the center of one end of the split key member 31 along the longitudinal direction of the split key member 31, and extends along the first direction orthogonal to the longitudinal direction. Further, a sandwiching portion 37 having a first shaft through-hole 37a and a sandwiching portion 37 that is provided along the longitudinal direction from the other end of the split key member 31 and that is provided in another split key member 31 can be sandwiched. In addition, when the sandwiched portion 37 is sandwiched, a sandwiched portion 38 having a second shaft through hole 38a along the first direction at a position corresponding to the first shaft through hole 37a, and a sandwiched portion 38. A shaft member 39 that can penetrate the first shaft through hole 37a and the second shaft through hole 38a when the sandwiched portion 37 is sandwiched between the first shaft through hole 37a and the second shaft through hole 38a may be provided.

  A sandwiching portion 37 of another split key member 31 is sandwiched in a sandwiched portion 38 provided in the split key member 31 already arranged in the key groove portion G, and a first shaft through hole 37a provided in the sandwiching portion 37 is inserted. By connecting the shaft member 39 to the second shaft through hole 38a provided in the sandwiched portion 38, the connection of the two split key members 31 is completed. In this case, as another divided key member 31 is inserted into the key groove portion G through the opening 16 while rotating around the axis of the shaft member 39, the divided key member 31 already arranged in the key groove portion G It is fed along the groove part G in the circumferential direction of the steel pipe.

  In the above-described embodiment, the steel pipe coupling mechanism J is provided with the tubular joint 10 at one of the steel pipe end portions facing each other of the steel pipes S (S1, S2) adjacent to each other in the steel pipe axis X direction, and the other steel pipe. Although the case where the shaft-like joint 20 is provided at the end portion has been described, the present invention is not limited thereto.

  For example, as shown in FIG. 9, shaft joints 20 are provided at both ends of steel pipes S (S 1, S 2) that are adjacent to each other in the steel pipe axis X direction, and the shaft joints 20 are adjacent to each other. In this state, the cylindrical joint 10 may be provided around the shaft-shaped joint 20. In addition, the same code | symbol is attached | subjected about the structure corresponding to the structure shown in FIG.

  In this embodiment, the tubular joint 10 is provided with two inward groove portions 15 on the inner peripheral surface along the circumferential direction of the steel pipe. However, each shaft joint 20 is provided with a single outward groove 25. Furthermore, the cylindrical joint 10 is comprised from the some surrounding wall member 10a and the surrounding wall member 10b in the steel pipe circumferential direction. The opening 16 is provided only in the peripheral wall member 10a.

  Even with such a configuration of the cylindrical joint 10 and the shaft-shaped joint 20, the tubular joint 10 and the shaft-shaped joint 20 are connected in a retaining state by using the split key member 31 as shown in FIG. 2. be able to.

  As shown in FIG. 10, when the tubular joint 10 and the shaft joint 20 are fitted to each other, the split key member 31 is used as a jig, and the split key member 31 already arranged in the key groove portion G is used as a key. By repeatedly placing another split key member 31 in the key groove portion G while pressing and feeding in the steel pipe circumferential direction along the groove portion G, the key groove portion G has a plurality of split key members 31 extending in the steel pipe circumferential direction. It arrange | positions and the cylindrical coupling 10 and the shaft-shaped coupling 20 are connected in the retaining state.

  Even in the configuration of the cylindrical joint 10 and the shaft-shaped joint 20 as shown in FIG. 9, the split key member 31 as shown in FIG. It can also be connected in a stopped state.

  Furthermore, the steel pipe coupling mechanism according to the present invention can also be applied to a joining structure of columnar bodies as disclosed in Japanese Patent No. 4632911, that is, two columnar bodies are mutually connected on substantially the same axis. It is a joint structure of columnar bodies that are joined so as not to be inserted and removed, and is provided on the other columnar body of the two columnar bodies, and the shaft-like joint portion provided on one of the two columnar bodies, A cylindrical joint portion that can be fitted onto the shaft-shaped joint portion, a shaft-side key groove provided on the outer periphery of the shaft-shaped joint portion along the circumferential direction of the shaft center, and an inner periphery of the cylindrical joint portion A cylinder-side key groove that faces the shaft-side key groove when the cylindrical joint portion is externally fitted to the shaft-shaped joint portion, and the shaft-side key groove and the cylinder. One that is orthogonal to the axial center from the outside of the cylindrical joint so as to extend to the side keyway A key that can be freely inserted and removed along a holding hole formed in one of the shaft-like joint portion and the cylindrical joint portion along a direction orthogonal to the direction of inserting and removing the key, and the holding hole As shown in FIG. 2, a columnar body joining structure having a pin that is detachable without rotating and that is provided with a pin that comes into contact with an end of the key on the withdrawal side to prevent the key from coming off. It is also possible to connect the two columnar bodies in a retaining state by using the split key member 31 or the split key member 31 as shown in FIG.

  That is, it can also be applied to a Yatco as shown in FIG. 1 of Japanese Patent No. 4632911, and a split key member that is already arranged in the key groove portion through the opening is replaced with another split key member by the key groove portion. When the other divided key member is rotated around the axis of the shaft-like portion while being pushed in the circumferential direction of the steel pipe and fed, and the other divided key member is disposed in the key groove portion through the opening, The shaft-like portion provided in the other dividing key member accommodated in the accommodating groove provided in the arranged dividing key member cannot be engaged / disengaged in the direction along the longitudinal direction of the dividing key member. The connection of the split key members is completed.

  Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description. The specific configuration of each part can be appropriately changed and designed within the range where the effects of the present invention are exhibited. is there.

10: cylindrical joint 10a: peripheral wall member 10b: peripheral wall member 13: inner peripheral surface (cylindrical joint inner peripheral surface)
14: Groove part 15: Inward groove part 16: Opening part 20: Shaft joint 23: Outer peripheral surface (axial joint outer peripheral surface)
24: groove portion 25: outward groove portion 30: load transmission key 31: split key member 32: key body portion 33: protrusion 34: shaft portion 35: receiving groove portion 37: insertion portion 37a: first shaft through hole 38: covered Insertion part 38a: 2nd shaft through-hole 39: Shaft member C: Connection mechanism D: Dimension G: Key groove part H: Width dimension J: Steel pipe connection mechanism L: Longitudinal dimension S: Steel pipe X: Steel pipe shaft center

Claims (7)

A steel pipe coupling mechanism for coupling steel pipe ends facing each other of steel pipes adjacent to each other in the steel pipe axial direction in a state of being prevented from coming off in the steel pipe axial direction by a key member,
The key member is composed of a plurality of divided key members in the circumferential direction of the steel pipe,
The split key member is provided with a coupling mechanism capable of connecting the split key members adjacent to each other at both ends in the longitudinal direction of the split key member, and has an opening communicating with a key groove portion where the split key member is disposed. A steel pipe coupling mechanism having a longitudinal dimension shorter than a lateral width dimension along the circumferential direction of the steel pipe and longer than a depth dimension of the opening. In the connection mechanism,
A projecting portion projecting from the center of one end of the split key member along the longitudinal direction;
An axial portion provided at the tip of the protruding portion and having an axial center along a first direction perpendicular to the longitudinal direction;
The shaft-like portion provided in another split key member can be received from the longitudinal direction and the second direction orthogonal to the first direction, and cannot be engaged / disengaged in the direction along the longitudinal direction. The steel pipe coupling mechanism according to claim 1, further comprising: In the connection mechanism,
A sandwiching portion projecting from the center of one end of the split key member along the longitudinal direction and having a first shaft through hole along a first direction perpendicular to the longitudinal direction;
When projecting along the longitudinal direction from the other end of the split key member, the sandwiching portion provided in another split key member can be sandwiched, and the sandwiching portion is sandwiched A sandwiched portion having a second shaft through hole along the first direction at a position corresponding to the first shaft through hole;
The shaft member that can penetrate the first shaft through hole and the second shaft through hole when the sandwiched portion is in a state of being sandwiched in the sandwiched portion. The steel pipe coupling mechanism described. A cylindrical joint provided at one of the steel pipe end portions facing each other of the steel pipes adjacent to each other in the axial direction of the steel pipe, and a shaft joint provided at the other steel pipe end portion and engageable with the cylindrical joint; Have
The key groove is an inward groove provided on the inner circumferential surface of the tubular joint along the circumferential direction of the steel pipe, and the tubular joint and the shaft joint are fitted to each other. At the time, the shaft-shaped joint outer peripheral surface of the shaft-shaped joint is composed of an outward groove portion provided to face the inward groove portion along the steel pipe circumferential direction,
The steel pipe coupling mechanism according to any one of claims 1 to 3, wherein the opening is provided in the cylindrical joint. Shaft joints provided at both ends of the steel pipes facing each other of the steel pipes adjacent in the axial direction of the steel pipe;
In a state where the two shaft-like joints are adjacent to each other, a cylindrical joint that can be provided around the two shaft-like joints, and
The key groove portion is an inward groove portion provided along a circumferential direction of the steel pipe on a cylindrical joint inner peripheral surface of the cylindrical joint, and the cylindrical joint and the shaft-shaped joint are fitted to each other. When the shaft-shaped joint outer peripheral surface of the shaft-shaped joint is composed of an outward groove portion provided to face the inward groove portion along the steel pipe circumferential direction,
The steel pipe coupling mechanism according to any one of claims 1 to 3, wherein the opening is provided in the cylindrical joint. Shaft joints provided at both ends of the steel pipes facing each other of the steel pipes adjacent in the axial direction of the steel pipe;
In a state where the two shaft-like joints are adjacent to each other, a cylindrical joint that can be provided around the two shaft-like joints, and
The key groove is an inward groove provided on the inner circumferential surface of the tubular joint along the circumferential direction of the steel pipe, and the tubular joint and the shaft joint are fitted to each other. At the time, the shaft-shaped joint outer peripheral surface of the shaft-shaped joint is composed of an outward groove portion provided to face the inward groove portion along the steel pipe circumferential direction,
The cylindrical joint is composed of a plurality of peripheral wall members in the circumferential direction of the steel pipe,
The steel pipe connecting mechanism according to any one of claims 1 to 3, wherein the opening is provided in at least one peripheral wall member among the plurality of peripheral wall members. Steel pipe connection in which steel pipe ends facing each other in the steel pipe axial direction are connected to each other in a steel tube axial direction by a key member composed of a plurality of divided key members in the steel pipe axial direction. A method,
Another divided key member is connected to the divided key member already arranged in the key groove portion through the opening communicating with the key groove portion where the key member is arranged, and already arranged in the key groove portion by the other divided key member. A steel pipe coupling method in which the other divided key member is disposed in the key groove portion while the divided key member being pressed and fed in the circumferential direction of the steel pipe along the key groove portion.

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