JP2019039142A - Steel pipe joint device - Google Patents

Abstract

To provide a steel pipe for piles which can be securely connected with good workability.SOLUTION: Both opposing circumferential surfaces 12a, 12b, 22a and 22b of a cylindrical male and female joints 10 and 20 fitted in a cylinder axial direction become smaller or larger in two stages, and an L-shaped groove is formed, which comprises an axial space between convex portions 13a, 13b, 23a and 23b on inner and outer peripheral surfaces and a circumferential space under the convex portion 23b. A hole 25 in the cylinder axial direction is formed on a bottom surface (step surface 22c) in a middle of the groove, and a rotation preventing member 26 is loaded in the hole 25 via a coil spring. When both joints are fitted, the rotation preventing member is retracted into the hole. When the male joint is rotated around the axis with the opposing end surfaces of both joints in contact, the lower convex portion 13b of the male joint is fitted to a lower side of the lower convex portion 23b of the female joint, upper and lower steel pipes are connected in the axial direction, the upper convex portion 13a of the male joint abuts on the upper convex portion 23a of the female joint, and the rotation preventing member is protruded by the spring to enter between the convex portion 13a and the convex portion 23a, and the upper and lower steel pipes are connected in the circumferential direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a steel pipe joint device, for example, a steel pipe joint device such as a steel pipe pile used for pile foundation work.

  For example, when pressing and embedding in a ground while rotating a steel pipe to be a pile, in order to reach a predetermined depth, the construction is temporarily stopped during the press-fitting and the steel pipe is connected. On-site welding is performed as a means of connecting the steel pipe. However, since the welding requires a high level of skill and is affected by the weather, a non-welded type steel pipe joint device is used on site. Proposed.

As an example of the steel pipe joint device, a female joint having an L-shaped engagement groove 6 (locking groove 4) is provided at the head of the steel pipe lower pile, and the lower part of the upper pile is fitted into the engagement groove 6. There has been proposed a steel pipe joint having an engagement protrusion 7 (reference numeral 1 in the patent document, the same applies hereinafter) and a rotation preventing member 8 for locking the engagement protrusion 7 to the engagement groove 6 (patent). (Refer to Literature 1 abstract, FIGS. 1 to 7 etc.).
The steel pipe coupling device includes an axial groove 6a with an upper part of the engagement groove 6 open and a circumferential groove 6b extending in the circumferential direction from the lower part of the axial groove, and the engagement protrusion 7 is connected to the upper pile from the axial groove 6a. The rotation preventing member 8 is placed on the protrusion 7 and is moved away from the protrusion 7 and moves in the axial groove 6a as the protrusion 7 moves to the circumferential groove 6b. It falls to close the circumferential groove 6b, and the projection 7 is locked in the circumferential groove 6b to connect and fix the upper and lower piles.

JP 2003-90034 A

  In the steel pipe joint device described in Patent Document 1, the rotation blocking member 8 is temporarily fixed on the engaging protrusion 7 by welding or adhesion, and the state is unstable. Because of the configuration of falling, the action becomes unstable (it is not sure whether the circumferential groove 6b is surely blocked), and the connection fixing of the upper and lower piles is unstable (Patent Literature) 1 paragraph 0010).

  This invention makes it a subject to stabilize the connection fixation of the upper and lower piles by the said engagement protrusion.

  In order to achieve the above object, the present invention provides a steel pipe having a male joint having a convex portion facing outward in the circumferential direction and a steel pipe having a female joint having a convex portion facing inward in the circumferential direction. After fitting one another through the joint, one or both of them are rotated so that the positions of the projections are relatively shifted, and the steel pipe joints are connected so that their projected cross sections overlap in the axial direction of the steel pipe. In the structure, a relative rotation of the male / female joint after connection is prevented by a rotation preventing member provided so as to be able to protrude and retract in the axial groove.

In this configuration, the rotation preventing member is provided on one of the male and female joints, and is configured to prevent relative rotation of the male and female joints by being locked to the rotation preventing projection of the other joint. The other joint is a male joint, and the non-rotating convex portion is provided so as to be shifted in the axial direction from the convex portion facing outward in the circumferential direction, or a female joint in which a male joint is fitted. The inner surface of the opposite peripheral surface is two outer peripheral surfaces that increase in diameter in two steps from the opening side to the opposite side, and the opposing peripheral surface with the male joint with which the female joint is fitted is directed from the opening side to the opposite side. The two inner peripheral surfaces have a small diameter in two stages, and the convex portions facing outward in the circumferential direction of the male joint are formed on the outer peripheral surface on the opening side of the two outer peripheral surfaces, and the circumferential direction of the female joint The convex part facing inward is formed on the inner peripheral surface of the two inner peripheral surfaces opposite to the opening, Ri stopper protrusion can or a configuration that is formed on the outer peripheral surface of the counter-opening side of the two outer peripheral surface.
At this time, the one joint is a female joint, an axial hole in which the rotation prevention member protrudes and protrudes is formed in the female joint, and an axially long guide hole that penetrates from the hole to the outer peripheral surface of the female joint is formed. A guide rod extending from the rotation prevention member through the guide hole to the outer peripheral surface of the female joint is provided, and when the rotation prevention member protrudes from the hole, the guide rod contacts the end of the guide hole and further protrudes from the rotation prevention member. Can be prevented.

  A more specific configuration is a steel pipe joint device that connects two steel pipes, each comprising a pair of cylindrical male and female joints fixed to the steel pipe, the male and female joints fitting in the cylinder axis direction. A convex portion is formed on one of the opposing peripheral surfaces with which the male and female joints are fitted, and a groove-like concave portion in which the convex portion is fitted is formed on the other side, and the concave portion is one of the male and female joints. An axial groove extending in the cylinder axial direction on the opposite side of the opening and a circumferential groove extending in the circumferential direction from the tip of the axial groove, and the male and female joints are fitted in the cylindrical axial direction. When the convex portion enters the axial groove portion from the opening of the concave portion and reaches the bottom surface of the axial groove portion, when the male and female joints are relatively rotated, the convex portion enters the circumferential groove portion of the concave portion and The female joint is retained in the cylinder axis direction, and a hole in the cylinder axis direction is formed on the bottom surface of the recess. A rotation-preventing material (rotation-preventing member) is removably loaded in the hole, and a pressing material that presses the rotation-preventing material in the projecting direction is loaded. When fitting in the direction, it is pushed by the convex part and submerged in the hole, allowing the convex part to enter the axial groove part, and the convex part enters the circumferential groove part of the concave part, and the male and female joints come out in the cylinder axial direction. When stopped, it is possible to employ a configuration in which the male and female joints are prevented from rotating relative to each other by being pressed by the pressing member and projecting and fitting into the axial groove portion of the recess.

  Further, as another more specific configuration, a steel pipe joint device for connecting two steel pipes, each comprising a pair of cylindrical male and female joints fixed to the steel pipe, the male and female joints being in the cylinder axis direction. The two outer peripheries that are fitted and the inner sides of the opposing peripheral surfaces of the male and female joints are fitted in two steps from the opening side of the inner male and female joints that face each other toward the opposite side. The outer side has two inner peripheral surfaces that are reduced in diameter in two steps from the outer opening side toward the opposite side, and a retaining projection is provided on one of the opposing peripheral surfaces on the opening side. A groove-like recess is formed on the other of the opposing peripheral surfaces other than the opening side, and the recess-preventing convex portion is fitted into the recess, and the concave portion is a boundary between the inner peripheral surfaces having a small diameter in two stages. An axial groove opening in the step surface and extending in the cylinder axial direction on the opposite side of the opening, and a tip of the axial groove A circumferential groove extending in the circumferential direction, and a non-rotating convex portion is formed on one of the opposing circumferential surfaces other than the opening side with an interval from the retaining convex portion to the non-opening side in the cylinder axis direction. A non-rotating convex portion is also formed on the other of the opposing peripheral surfaces on the opening side, and when the male and female joints are fitted in the cylinder axial direction, the retaining convex portion enters the axial groove portion from the opening of the concave portion. When the male and female joints are relatively rotated after reaching the bottom surface of the axial groove part, the retaining convex part enters the circumferential groove part of the concave part, and the male and female joints are retained in the cylindrical axis direction, and A hole in the cylinder axis direction is formed in the boundary step surface, and a rotation-preventing material is loaded in the hole so as to be able to appear and retract, and a pressing material that presses the rotation-preventing material in the protruding direction is loaded. When the female joint fits in the cylinder axis direction, the rotation-preventing material is pushed by the anti-rotation projections spaced apart. When the male and female joints are rotated relative to each other after being submerged in the hole, the anti-rotation convex portions spaced apart move in the circumferential direction and abut against the other anti-rotation convex portions of the opposing peripheral surfaces on the opening side. The rotation prevention material is released from being pushed into the hole, and with the release, the rotation prevention material is positioned on the side surface of the anti-rotation convex portion spaced apart by the pressing material, and the anti-rotation convexity separated by the interval. It is possible to employ a configuration in which relative rotation of the male-female joint is blocked by locking the portion and the rotation blocking material.

With this other configuration, the engagement of the rotation-preventing convex portion and the rotation-preventing convex portion on the opening side and the rotation-preventing material spaced apart from each other ensures the circumferential integration of the male and female joints, Engagement of the male and female joints in the axial direction is ensured by the engagement of the retaining projections and recesses on the back side, and the integration of the circumferential direction and axial direction (drag) is related to the separate projections (concaves). Therefore, the male / female joint has a high coupling (connection) strength.
Moreover, since the convex part and the concave part are formed in the two-stage opposed peripheral surfaces of the fitted male and female joints, the fitting depth (overlap) of the male and female joints becomes long, and the bending in the axial direction When receiving a moment, it effectively exerts its drag.
The relative rotation prevention of the male and female joints prevents rotation in the rotation direction in which the rotation-preventing convex portion and the rotation-preventing material spaced apart from each other are locked (contacted). If the stop projection is sandwiched between the rotation prevention member and the other rotation prevention projection of the opposing circumferential surfaces, both forward and reverse relative rotations of the male and female joints can be prevented.

When loading the hole with the anti-rotation material, the hole is formed in the outer joint where the male and female joints are fitted, and a long guide hole is formed from the hole to the outer peripheral surface of the joint in the direction of the cylinder axis. When the guide rod is directed from the blocking material through the guide hole to the outer peripheral surface of the joint, and when the rotation blocking material protrudes from the hole, the guide rod contacts the end of the guide hole and prevents further rotation of the rotation blocking material. It is preferable to do so.
If comprised in this way, the position of a rotation prevention material can be confirmed in the position in the guide hole of a guide rod, and the connection strength degree of the cylinder axis direction of a male-female joint can be confirmed. Moreover, the protrusion degree from the hole of a rotation prevention material can be adjusted with the length setting of a guide hole.

  Since this invention was comprised as mentioned above, it can connect a steel pipe reliably with sufficient workability | operativity.

Partially cutaway front view of a state in which steel pipes are connected by an embodiment of a steel pipe joint device according to the present invention II-II sectional view of FIG. The perspective view which cut | disconnected the male-female joint of the embodiment The male joint of the embodiment is shown, (a) is a partially cutaway front view of a state welded to a steel pipe, (b) is a bottom view of the same The female joint of the embodiment is shown, (a) is a top view of a state welded to a steel pipe, (b) is a front view of the same part cut out Schematic diagram for explaining the operation of the embodiment FIG. 6B is a schematic cut plan view of the state of FIG. The perspective view which disconnected the male-female joint of other embodiment of the steel pipe joint apparatus which concerns on this invention Schematic diagram for explaining the operation of the embodiment The perspective view which cut | disconnected the male and female joint of further another embodiment of the steel pipe coupling apparatus which concerns on this invention Schematic diagram for explaining the operation of the embodiment The perspective view which cut | disconnected the male and female joint of further another embodiment of the steel pipe coupling apparatus which concerns on this invention Schematic diagram for explaining the operation of the embodiment

  One embodiment of the steel pipe joint device according to the present invention is shown in FIGS. 1 to 7, and the steel pipe joint device A of this embodiment also includes a pair of cylindrical male joint 10 and cylindrical female joint 20. The steel pipes 1a and 1b (general symbol: 1) are JIS G 3444 general structural carbon steel pipes (STK) and steel pipe piles (SKK) specified in JIS A 5525. Both joints 10 and 20 are attached to the steel pipe 1. Made of weldable metal. Usually, a steel pipe pile employs an outer diameter of 165.2 mm or more. The fitting length of the male / female joints 10 and 20 may be appropriately set in consideration of the connection strength. For example, when the joint outer diameter is about 270 mm, the fitting length is about 90 mm.

As shown in FIGS. 3 and 4, the male joint 10 has the upper edge 11 lacked (cut) over the entire circumference so that the outer peripheral surface thereof is substantially the same as the inner diameter of the steel pipe 1, and the steel pipe 1 (1b ) And integrated with the steel pipe 1 by welding a (see FIG. 1). At this time, the outer peripheral surface of the steel pipe 1 and the outer peripheral surface of the male joint 10 are flush with each other, and there is almost no protrusion at the connection portion.
The outer peripheral surface of the male joint 10 going downward from the upper edge 11 is an outer peripheral surface 12a, 12b having a small diameter in two steps (a large diameter in two steps from the opening side to the opposite side), Convex portions (toothed portions) 13a and 13b are formed on the outer peripheral surfaces 12a and 12b, respectively. Eight upper convex portions 13a are formed at equal intervals around the periphery, and twelve lower convex portions 13b are formed at equal intervals around the periphery. The number of the convex portions 13a and 13b is arbitrary, and the interval may not be equal. In short, it is an interval or number that can secure the blocking action in the vertical direction and circumferential direction (rotation direction) described later, and it is only necessary to ensure the engagement force that can transmit the rotational force to the connected steel pipes 1 and 1. . It is preferable to chamfer the fitting portion.

Both convex portions 13a and 13b are positioned with a required interval t in the vertical direction (see FIG. 4). When the male and female joints 10 and 20 are fitted to each other, the distance t is large enough to allow the convex portion 23b of the female joint 20 to enter between the upper and lower convex portions 13a and 13b of the male joint 10 as shown in FIG. Say it.
Further, the top surface of the convex portion 13b is located on the inner side (center side) where the male and female joints 10 and 20 are fitted from the inner peripheral surface 22b on the side opposite to the opening side (lower side) of the female joint 20 and the top surface of the convex portion 23a. It is set so as to be positioned (see FIG. 2), and the convex portion 13b can enter the concave portion 24 described below without hitting the boundary step surface 22c of the female joint 20.

As shown in FIGS. 3 and 5, the female joint 20 has the lower edge 21 missing (cut) over the entire circumference so that the outer peripheral surface thereof is substantially the same as the inner diameter of the steel pipe 1. ) And integrated with the steel pipe 1a (1) by welding a (see FIGS. 1 and 5). At this time, the outer peripheral surface of the steel pipe 1 and the outer peripheral surface of the female joint 20 are flush with each other, and there is almost no protrusion at the connection portion.
The inner peripheral surface facing downward of the female joint 20 is an inner peripheral surface 22a, 22b having a small diameter in two steps, and convex portions (toothed portions) 23a, 23b are formed on the inner peripheral surfaces 22a, 22b, respectively. Has been. Eight upper convex portions 23a are formed at equal intervals around the periphery, and twelve lower convex portions 23b are formed at equal intervals around the periphery. The number of the convex portions 23a and 23b is arbitrary, and the interval may not be equal. In short, it is an interval or number that can ensure the blocking action in the vertical direction and the circumferential direction (rotation direction) described later, and it is sufficient that the meshing force capable of transmitting the rotational force to the connected steel pipes 1 and 1 is ensured. . It is preferable to chamfer the fitting portion.

In this embodiment, in the claims, “the two inner peripheral surfaces having a small diameter in two steps from the opening side to the opposite side of the female joint 20” are “the inner peripheral surface 22a and each convex portion 23b. "Circular inner peripheral surface formed by the top surface".
For this reason, the concave portion has an inner peripheral surface 22a having a small diameter in the above two steps after passing between the convex portions 23a, 23a, which is indicated by a chain line 24 in FIG. 5 (b) and FIG. 6 (a). It is formed by an L-shaped space (groove) composed of an axial groove portion 24a between the convex portions 23b, 23b that opens to the boundary step surface 22c of 22b and a circumferential groove portion 24b that extends below the convex portion 23b. The

An axial hole 25 is formed between the upper convex portions 23a and 23a on the boundary step surface 22c of the inner peripheral surfaces 22a and 22b of the female joint 20. It is not necessary to provide this hole 25 between all the convex parts 23a, 23a, and it is sufficient to provide at least one. When a plurality of holes 25 are formed, they are equally spaced in the circumferential direction. In this embodiment, four are formed at equal intervals.
In each hole 25, a covered cylindrical rotation blocking member 26 is fitted so as to be movable up and down. A coil spring 27 is loaded into the rotation prevention member 26, and the cylindrical rotation prevention member 26 is urged from the hole 25 in the protruding direction by the coil spring 27. Instead of the coil spring 27, various elastic bodies such as an elastic resin capable of projecting the rotation preventing member 26 from the hole 25 can be used.

  Further, the rotation preventing member 26 is provided with a pin (guide rod) 28 made of a countersunk bolt (disc screw), and this pin 28 reaches the outer surface of the female joint 20 through an elongated hole (guide hole) 29 in the vertical direction. Yes. By fitting the pin 28 into the long hole 29, the rotation prevention member 26 is prevented from popping out from the hole 25, and the position of the rotation prevention member 26 in the hole 25 can be confirmed. That is, it can be visually confirmed whether the rotation blocking member 26 is in a state of being submerged in the hole 25 or protruding from the hole 25. The pin 28 can protrude from the outer peripheral surface of the female joint 20 for a required length as long as there is no problem.

  The steel pipe joint device A of this embodiment has the above-described configuration. In the factory, the male joint 10 is attached to one end 1b (for example, the lower end) of the connecting steel pipe 1 by welding a, and the other end 1a (the same upper end). The female joint 20 is attached by welding a. In addition, the excavator which has an auger drill, a bit, etc. is attached to the tip of the steel pipe pile used as the front-end | tip of a pile, and the drive device for driving fits the female joint 20, and gives the rotational force and excavation force to the steel pipe 1. Things are used.

The steel pipe 1 (1a) having the excavating tool is press-fitted into the ground while being rotated, and the construction is temporarily stopped during the press-fitting, so that the steel pipe 1b in the future is replaced with the steel pipe 1a in the future. Connect by. The connection is performed by fitting the male joint 10 at the lower end of the steel pipe 1b in the future into the female joint 20 at the upper end of the steel pipe 1a in the future.
At this time, the diameter of the outer peripheral surface 12a of the male joint 10 is substantially the same as the diameter of the circumferential surface formed by the top surface of each convex portion 23a of the female joint 20 with a fitting allowance. The diameter of the inner peripheral surface 22a of the female joint 20 is substantially the same as the diameter of the peripheral surface formed by the top surface of each convex portion 23b of the female joint 20 and the fitting allowance. The diameter of the inner circumferential surface 22b of the female joint 20 is almost the same as the diameter of the circumferential surface formed and the fitting allowance. The diameter of the inner peripheral surface 22b of the female joint 20 has the same diameter as the circumferential surface formed by the top surface of the convex portion 13b of the male joint 10. Since they are set substantially the same, the male joint 10 fits smoothly into the female joint 20 in the cylinder axis direction (see FIG. 2).

  Further, as shown in FIG. 6A, the female joint 20 is in a state in which the rotation prevention member 26 protrudes from the hole 25, and when the next steel pipe 1b is added to the driven steel pipe 1a, When the male joint 10 at the end of the steel pipe 1b is inserted into the female joint 20 at the end of the steel pipe 1a, as shown in FIGS. 6 (a) → 6 (b) → FIG. 6 (c) Along with the fitting of the joint 10 (with the insertion of the concave portion 24 of the convex portion 13b into the axial direction portion 24a), the rotation preventing member 26 is pushed by the upper convex portion 13a of the male joint 10 by the convex portion 13a. In contrast, the male joint 10 is allowed to be retracted (submerged) into the hole 25, and the male joint 10 is pushed in, and the opposing end surfaces of the male and female joints 10 and 20 come into contact with each other (see FIG. 6 (b)). At this time, the lower convex portion 13b of the male joint 10 is located below the lower convex portion 23b of the female joint 20 in the vertical direction (located at the lower end of the axial direction portion 24a of the concave portion 24).

In this state, when the male joint 10 (steel pipe 1b) is rotated around its axis, the lower convex portion 13b of the male joint 10 is replaced with the lower convex portion 23b of the female joint 20 as shown in FIG. While fitting into the lower side (with the convex part 13b entering the circumferential part 24b of the concave part 24 and connecting so that the projected cross sections of both 13b and 23b overlap in the axial direction of the steel pipes 1a and 1b), The upper convex part 13a contacts the upper convex part 23a on the female joint 20 side. That is, both the convex portions 13b and 23b serve to prevent the male and female joints 10 and 20 (steel pipes 1a and 1b) from coming off in the axial direction, and the both convex portions 13a and 23a serve as a detent. 20 or more rotational movements are prevented, and the male and female joints 10 and 20 are positioned in the circumferential direction. Then, the pressing by the projection 13a of the rotation prevention member 26 is released, and the rotation prevention member 26 protrudes by the coil spring 27, and is between the upper projection 13a of the male joint 10 and the upper projection 23a of the female joint 20 (gap). It enters (FIG. 6 (c)).
In this state, the upper and lower steel pipes 1a and 1b are connected in the axial direction (vertical direction) by the vertical engagement of the convex portion 13b of the male joint 10 and the convex portion 23b of the female joint 20, and the male joint 10 side By sandwiching the convex portion 13a between the convex portion 23a on the female joint 20 side and the rotation preventing member 26, the upper and lower steel pipes 1a and 1b are connected in the circumferential direction (rotating direction). At this time, both the forward and reverse rotation directions of the upper and lower steel pipes 1a and 1b are connected (rotation blocked) by the clamping.

  At this time, if the pin 28 is positioned at the upper end of the long hole 29, the rotation preventing member 26 is positioned between the convex portion 13a and the convex portion 23a, and the male and female joints 10, 20 are integrated in the circumferential direction. (See FIG. 6C). If the pin 28 is not located at the upper end of the long hole 29, the male and female joints are made with the pin 28 placed at the upper end of the long hole 29 by a screwdriver or the like so that the rotation preventing member 26 is located between the convex portions 13 a and 23 a. 10 and 20 are integrated in the circumferential direction. Thus, if all the pins 28 are positioned at the upper end of the long hole 29, it can be confirmed by visual observation that the male and female joints 10, 20 are firmly integrated in the vertical direction and the circumferential direction.

With the above operation, as shown in FIG. 1, the steel pipes 1a and 1b connected by the male and female joints 10 and 20 are integrated in the rotation direction and the vertical direction (separation direction). In this state, press-fitting from the upper steel pipe 1b is started. Thereafter, a similar number of steel pipes 1 are added by the same action, and a steel pipe pile having a required length is driven (press-fitted).
At this time, the engagement of the convex portions 13a and 23a and the rotation preventing member 26 ensures the circumferential integration of the male and female joints 10 and 20, and the convex portion 13b and the circumferential portion 24b (the convex portion 23b) of the concave portion 24 are secured. Engagement of the male and female joints 10 and 20 in the axial direction is ensured by the engagement. For this reason, since the integration (drag) in the circumferential direction and the axial direction is shared by the relationship of the separate convex portions (concave portions), the steel pipe joint device with high coupling (connection) strength is obtained.
Further, since the protrusions 13b and 23b for retaining are positioned and engaged on the inner side (back) where the male and female joints 10 and 20 are fitted, when the steel pipes 1a and 1b receive a bending moment, Demonstrate drag effectively.

  When the steel pipe pile driven into the ground is pulled out, each steel pipe 1 is pulled out to the ground by reversing the pile (steel pipes 1a, 1b), and the pin 28 is moved downward in the steel pipe joint device A of each steel pipe 1, 1. The rotation preventing member 26 is immersed in the hole 25, the upper steel pipe 1b is rotated (the convex portion 13b is moved in the circumferential portion 24b of the concave portion 24), and the upper and lower convex portions 13a of the male joint 10 are 13b is positioned between the convex portions 23a and 23a of the female joint 20 (positioned in the axial direction portion 24a of the concave portion 24) so that both the joints 10 and 20 can be detached. In this state, the lower steel pipe 1a This is done by pulling away the upper steel pipe 1b.

In the above-described embodiment, the inner and outer peripheral surfaces of the male and female joints 10 and 20 are formed into outer peripheral surfaces 12a and 12b or inner peripheral surfaces 22a and 22b having a large diameter or a small diameter in two stages, and the convex portions 13a, 13b, 23a, Although 23b was formed in two steps, the inner and outer peripheral surfaces 12 and 22 can be in one step.
For example, as shown in FIG. 8, convex portions 13 a, 13 b, 23 a, and 23 b are provided on the outer peripheral surface 12 and the inner peripheral surface 22 of the male and female joints 10 and 20 so as to be shifted in the axial direction. The parts 13a and 13b may be on the same axis, and the convex parts 23a and 23b of the female joint 20 may be connected in a U-shape on the same axis. In this case, the concave portion 24 includes an axial groove portion (space) 24a and two circumferential groove portions (spaces) 24b. As shown in FIG. 9A → FIG. 9B → FIG. 9C, As the male joint 10 is fitted and rotated into the female joint 20, the upper and lower steel pipes 1a and 1b are engaged by the vertical engagement of the convex portions 13a and 13b of the male joint 10 and the convex portions 23a and 23b of the female joint 20. While being connected in the axial direction, the upper and lower steel pipes 1a, 1b are circumferentially engaged by the engagement in the circumferential direction (rotational direction) via the rotation preventing member 26 of the convex portions 13a, 13b and the convex portions 23a, 23b. Connected in the direction of rotation). For this reason, in this embodiment, both rotation prevention and retaining are performed by the individual engagement (entrance) of the convex portions 13a, 13b and the convex portions 23a, 23b.

  Further, in the embodiment of FIGS. 8 and 9, the upper and lower convex portions 13 a and 13 b of the male joint 10 are omitted (only one convex portion), and similarly, the upper and lower convex portions 23 a of the female joint 20 are 23b may be omitted (only one convex portion is provided). For example, as shown in FIGS. 10 and 11, only the lower convex portions 13b and 23b can be used, or as shown in FIGS. 12 and 13, only the upper convex portions 13a and 23a can be used. At this time, the convex portions 23b and 23a of the female joint 20 are formed in an inverted L shape when viewed from the front.

  In both the embodiments, when the male joint 10 is fitted into the female joint 20, FIG. 11 (a) → FIG. 11 (b) → FIG. 11 (c) or FIG. 13 (a) → FIG. 13 (c), as the male joint 10 is fitted, the rotation prevention member 26 is pushed by the lower convex portion 13b or the upper convex portion 13a of the male joint 10 and resists the coil spring 27 in the hole 25. The male joint 10 is allowed to fit in (retract). Eventually, when the male joint 10 is pushed in and the opposing end surfaces of the male and female joints 10 and 20 come into contact with each other (FIG. 11 (b) and FIG. 13 (b)), the convex portion 13b or 13a of the male joint 10 becomes the female joint 20. Is located in the lower part of the vertical direction of the convex part 23b or 23a (positioned at the lower end of the axial part 24a of the concave part 24).

In this state, when the male joint 10 (steel pipe 1b) is rotated around its axis, as shown in FIGS. 11 (c) and 13 (c), the convex portion 13b or 13a of the male joint 10 is located on the female joint 20 side. The projection is fitted below the projection 23b or 23a, and with the movement of the projection 13b or 13a, the press of the rotation prevention member 26 by the projection 13b or 13a is released, and the rotation prevention member 26 is projected by the coil spring 27. Then, it enters between the convex portions 13b or 13a (gap) of the male joint 10 (FIG. 11 (c), FIG. 13 (c)).
In this state, the upper and lower steel pipes 1a and 1b are connected in the axial direction (vertical direction) by the vertical engagement of the convex part 13b or 13a of the male joint 10 and the convex part 23b or 23a of the female joint 20, and The rotation prevention member 26 enters between the convex portions 13b, 13b or 13a, 13a of the joint 10 to prevent rotation in the circumferential direction (rotation direction), and the upper and lower steel pipes 1a, 1b are circumferentially (rotation direction). Connected. At this time, the convex portion 23b on the female joint 20 side may also contribute to the connection in the circumferential direction (see FIG. 9C).

In each of the above embodiments, the female joint 20 is welded to the lower (preceding) steel pipe 1a and the male joint 10 is welded to the upper (following) steel pipe 1b, but the female joint 20 is attached to the upper (following) steel pipe 1a. The male joint 10 can be welded to the lower (preceding) steel pipe 1b.
Further, although the male and female joint 10 is engaged with the female joint 20 by the convex portions 13b and 23b around the axial center, it can be engaged around the left. At this time, the positions and intervals of the adjacent convex portions 23b and 23b are opposite to those in the clockwise direction.
Furthermore, the present invention is not limited to steel pipe piles, and can be employed as various steel pipe joints.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. For example, the present invention has two stages of inner and outer peripheral surfaces 12a, 12b, 22a and 22b. However, the inner and outer surfaces of the two stages of the present invention can be applied to two or more inner and outer peripheral surfaces, for example, three stages and four stages. If it has a surface, it is included in the scope of the present invention.

A Steel pipe joint device 10 Male joint 11 of the steel pipe joint device Upper edges 12, 12a, 12b of the same male joint Outer peripheral surfaces 13, 13a, 13b Convex portion 20 of the same male joint Female joint 21 of the steel pipe joint device Joint lower edges 22, 22a, 22b Inner peripheral surface 22c of the female joint Boundary step surfaces 23, 23a, 23b Convex part 24 of the female joint Concave part of the female joint (L-shaped groove)
24a Axial portion 24b of the concave portion Circumferential portion 25 of the concave portion 26 Hole 26 Rotation preventing member 27 Coil spring (elastic body)
28 pin (Guide)
29 Guide hole

Claims (5)

  A steel pipe (1b) having a male joint (10) having a convex portion (13b) facing outward in the circumferential direction and a steel pipe (20) having a female joint (20) having a convex portion (23b) facing inward in the circumferential direction ( 1a) are fitted to each other via the male and female joints (10, 20), and then one or both of them are rotated to relatively shift the positions of the protrusions (13b, 23b). A steel pipe joint structure for connecting so that the projected cross sections of both of them overlap in the axial direction of the steel pipe, and the male and female joints after being connected by a rotation preventing member (26) provided so as to be able to protrude and retract in the axial groove (24) A steel pipe joint device that prevents relative rotation of (10, 20).   The rotation prevention member (26) is provided on one (20) of the male / female joint (10, 20), and is engaged with a male / female joint (13a) by engaging with a rotation preventing projection (13a) of the other joint (10). 10. The steel pipe joint device according to claim 1, which prevents relative rotation of 10 and 20).   The other joint (10) is a male joint (10), and the anti-rotation convex portion (13a) is provided to be shifted in the axial direction from the convex portion (13b) facing outward in the circumferential direction. The steel pipe joint device according to claim 2. The peripheral surface facing the female joint (20) with which the male joint (10) is fitted becomes two outer peripheral surfaces (12a, 12b) having a large diameter in two steps from the opening side to the opposite side, 20) The opposing peripheral surface with the fitted male joint (10) is two inner peripheral surfaces (22a) having a small diameter in two steps from the opening side to the opposite side,
The convex portion (13b) facing the outer circumferential direction of the male joint (10) is formed on the outer peripheral surface (12b) on the opening side of the two outer peripheral surfaces (12a, 12b), and the female joint (20) The convex portion (23b) facing inward in the circumferential direction is formed on the inner peripheral surface on the opposite side of the two inner peripheral surfaces (22a),
The steel pipe joint device according to claim 3, wherein the rotation preventing projection (13a) of the male joint (10) is formed on the outer peripheral surface (12a) on the opposite side of the two outer peripheral surfaces (12a, 12b).   The one joint (20) is a female joint (20), and the female joint (20) is formed with an axial hole (25) in which the rotation preventing member (26) protrudes and retracts. An axially long guide hole (29) penetrating the outer peripheral surface of the female joint (20) is formed, and the guide rod extends from the rotation prevention member (26) through the guide hole (29) to the outer peripheral surface of the female joint. (28) is provided, and when the rotation prevention member (26) protrudes from the hole (25), the guide rod (28) comes into contact with the end of the guide hole (29) and the rotation prevention member (26) The steel pipe joint structure according to any one of claims 1 to 4, wherein further protrusion is prevented.

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