JP2015169061A - joint structure of steel pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure of a steel pipe having a simple structure, quickly and easily joint-constructible, endurable against not only shear force and the bending moment but also axial torque, and easily manufacturable.SOLUTION: A joint structure of a steel pipe joins the two steel pipes 1 and 2 in the axial direction, and comprises a male type joint member 3 fixed to a joint surface end part peripheral surface of one steel pipe and a female type joint member 4 fixed to a joint surface end part peripheral surface of the other steel pipe. The male type joint member comprises a plurality of projection parts 32 arranged at an interval in the circumferential direction and projecting outside in the axial direction. This projection part comprises a slit 32a of a mode of being cut in in the axial direction from its tip, and can be deformed for expanding and reducing a distance between both side parts 32b and 32c in the circumferential direction by causing the expansion-reduction of a clearance of the slit, and the female type joint member comprises a recessed part 42 fitted to the projection part by causing deformation by interfering with the projection part in a connection operation process of allowing a joint surface a1 of the one steel pipe and a joint surface a2 of the other steel pipe to approach and abut in the axial direction.

Description

  The present invention relates to a joint structure for steel pipes.

Conventionally, when steel pipes are substructured, for example, a method of connecting ends of an upper pile and a lower pile by welding has been employed. However, in such work, it takes time to connect, it cannot be done depending on the weather, or the connection itself cannot be made when the connection part becomes underwater due to sky head limitation.
On the other hand, the method of attaching a mechanical coupling member to the edge part of each of an upper pile and a lower pile and connecting simply is proposed.
For example, in Patent Document 1, an end member in which a plurality of grooves are provided on the outer periphery, a convex portion is provided on one joint surface, and a concave portion is provided on the other joint surface is provided at the joint surface end of each steel pipe to be joined. In addition, a joint structure is described in which the convex portion is fitted and joined to the concave portion, and a plurality of divided connecting members are screwed into grooves on the outer periphery of the end member.
Patent Document 2 proposes a joint structure in which a joint member is composed of an engaging member and an engaged member, and at least one of them is inserted as an elastic body in the axial direction and relatively deformed and connected. Specifically, a structure in which the engaging member (and the engaged member) is deformed in the radial direction is disclosed, and after the connection, a deformation preventing tool that prevents deformation of the engaging member is fixed to the joint portion. .
Furthermore, in Patent Document 3, a plurality of L-shaped claws are protruded at the lower end of the upper pile, and a joint member provided with a guide tube is arranged on the inner side of the claws, and a claw groove corresponding to the claws is provided at the lower pile end. There is disclosed a joint structure in which a joint member provided with a screw member is disposed, and is joined by rotating in the rear circumferential direction after being inserted in the axial direction, and screw means for locking back the rotation.

JP2013-40537A JP 2003-3463 A Japanese Utility Model Publication No. 60-195330

However, the above conventional techniques still have the following problems.
In the invention described in Patent Document 1, it is necessary to go through the steps of bringing the end member into contact with each other and screwing the connecting member over the entire circumference. In addition, the end member and the connecting member have a complicated shape with a concavo-convex shape in the radial direction, and processing costs increase.
In the invention described in Patent Document 2, if the deformation prevention tool is not used, it can be connected with one touch, but the fixing is uncertain, and the engaging member and the engaged member have a complicated shape with a concavo-convex shape in the radial direction. Is bulky. Moreover, there is no torque transmission means, it cannot be applied to a rotating pile, and it is difficult to ensure bending rigidity.
In the invention described in Patent Document 3, the processing cost of the joint member can be kept relatively low, but the L-shaped claw is inserted and rotated and fitted, and the lock means is screwed over the entire circumference of the steel pipe. The process must be followed and is cumbersome. Further, in the rotary pile, since the screwing means transmits rotational torque, the screwing means must have a considerable shear resistance, which increases the cost.

  The present invention has been made in view of the above-described problems in the prior art, and it is possible to quickly and easily perform a joint, and to provide a joint that can withstand not only shearing force and bending moment but also shaft rotational force. It is an object of the present invention to provide a joint structure of a steel pipe having a simple structure that can be easily manufactured.

Invention of Claim 1 for solving the above subject is the joint structure of the steel pipe which joins two steel pipes in the axial direction,
Of the two steel pipes, a male joint member fixed on the peripheral surface of the joining surface of one steel pipe, and a female joint member fixed on the peripheral surface of the joint surface of the other steel pipe Prepared,
The male joint member has a plurality of convex portions that are arranged at intervals in the circumferential direction and project outward in the axial direction.
The convex portion has a slit that is cut in the axial direction from the tip thereof, and can be deformed by enlarging / reducing the distance between both side portions in the circumferential direction with enlargement / reduction of the gap of the slit. And
The female joint member causes the deformation by interfering with the convex portion in the connecting operation process in which the joining surface of the one steel pipe and the joining surface of the other steel pipe are approached and contacted in the axial direction. And a steel pipe joint structure having a recess that fits into the protrusion.

  According to a second aspect of the present invention, the joining surface that the male joint member and the female joint member abut against each other in the axial direction is the joining surface that the one steel pipe and the other steel tube abut against each other in the axial direction. The steel pipe joint structure according to claim 1, wherein the steel pipe joint structure is disposed at a position shifted in an axial direction.

In the invention according to claim 3, a claw protruding in the circumferential direction is formed on either one or both sides of the convex portion, and a claw groove for receiving the claw is formed in the concave portion,
In the connecting operation process, due to the elastic recovery deformation of the convex portion after causing the convex portion to undergo elastic deformation that reduces the distance between the two side portions with the reduction of the gap of the slit due to interference of the concave portion, The steel pipe joint structure according to claim 1 or 2, wherein a claw is received in the claw groove and the convex part is fitted into the concave part.

According to a fourth aspect of the present invention, the concave portion has a guide portion protruding in the axial direction from the bottom portion,
In the connection operation process, the convex portion is deformed to increase the distance between the two side portions with the enlargement of the gap between the slits due to the penetration of the guide portion into the slit. 3. The steel pipe joint structure according to claim 1, wherein the convex portion is formed in a structure in which the convex portion is fitted into the concave portion while being pressed against both inner portions.

According to the present invention, since the joining is completed only by the connecting operation in which the joining surface of one steel pipe and the joining surface of the other steel pipe are approached and brought into contact with each other in the axial direction, screws and other connecting members and tools are required. And can be installed quickly and easily.
In addition, since it is joined by fitting into recesses that are deformed in opposite directions along the circumferential direction of both sides of the convex part with slits in the axial direction, it can be used as a rotational force for any rotation around the axis. A durable joint is constructed.
The male joint member and the female joint member can be limited to the concave and convex shapes in the axial direction and the circumferential direction, and have a simple structure that can be cut out from the plate material when developed in a plane, and are easy to manufacture.
By the above, it can apply to the joint construction of all the steel pipe piles without being influenced by the weather. In particular, it can be easily connected even when there is an overhead restriction such as underground construction or bridge substructure, and even when the connection location is underwater.

It is a separation state perspective view of the joint structure of the steel pipe concerning a 1st embodiment of the present invention. It is a joining state perspective view of the joint structure of the steel pipe concerning a 1st embodiment of the present invention. It is the fragmentary figure which shows the fitting structure of the joint structure of the steel pipe which concerns on 2nd Embodiment of this invention, (a) shows a separation state, (b) shows a fitting state.

  An embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

[First Embodiment]
First, a joint structure for joining two steel pipes 1 and 2 shown in FIGS. 1 and 2 in the axial direction as a first embodiment will be described. Of these two steel pipes 1 and 2, one steel pipe is the upper pile 1 arranged on the upper side, and the other steel pipe is the lower pile 2 arranged on the lower side. By this joint structure, the lower end part of the upper pile 1 and the upper end part of the lower pile 2 are joined.

A male joint member 3 is fixed to the peripheral surface of the joint surface end of the upper pile 1. The male joint member 3 includes a cylindrical portion 31, a locking convex portion 32, and a sub convex portion 33. The cylindrical portion 31 is fitted on the upper pile 1 and fixed by welding or the like.
The locking convex part 32 and the sub convex part 33 are formed so as to project outward from the cylindrical part 31 in the axial direction. In this case, the axially outward direction is the downward direction. A plurality of locking projections 32 are provided, and the plurality of locking projections 32 are arranged at intervals in the circumferential direction. The intervals are preferably uniform. The sub convex portion 33 is disposed between the locking convex portions 32.

The locking projection 32 has a slit 32a that is cut in the axial direction from its tip. The locking projection 32 has both side portions 32b and 32c as members on both sides of the slit 32a.
By forming the slit 32a, the locking projection 32 can be deformed to enlarge / reduce the distance between the side portions 32b, 32c in the circumferential direction with enlargement / reduction of the gap of the slit 32a. . That is, as the gap between the slits 32a increases, the circumferential distance between both side portions 32b and 32c increases, and as the gap between the slits 32a decreases, the circumferential distance between both side portions 32b and 32c decreases.
Claws 32b1 and 32c1 projecting in the circumferential direction are formed on both side portions 32b and 32c of the locking projection 32. In other words, the protruding direction of the claw 32b1 formed on the one side portion 32b and the protruding direction of the claw 32c1 formed on the other side portion 32c are opposite to each other, and are outward directions centered on the slit 32a. .
The claw 32b1 is formed with a guide surface 32b2 inclined with respect to the axial direction and a locking surface 32b3 in the drawing direction. Similarly, the claw 32c1 is formed with a guide surface 32c2 inclined with respect to the axial direction and a locking surface 32c3 in the drawing direction.
As described above, the locking projection 32 is formed in a symmetrical shape with the slit 32a as the center.

  On the other hand, the female joint member 4 is fixed to the peripheral surface of the joint surface end of the lower pile 2. The female joint member 4 has a cylindrical portion 31, a locking recess 42, and a sub-recess 43. The cylindrical portion 41 is fitted on the lower pile 2 and fixed by welding or the like. Note that the male joint member 3 and the female joint member 4 only need to have the same diametrical size and can be fitted to each other. In addition to the installation, it can be carried out by being fixed to the inner peripheral surface.

The upper end side outer shape of the female joint member 4 provided with the locking recesses 42 and the sub-recesses 43 has a male-female relationship with the lower end side outer shape of the male joint member 3 provided with the locking protrusions 32 and the sub-projection 33. Match. That is, it is a phase-out relationship, and cutting out the lower end side outer shape of the male joint member 3 from one sheet of material corresponds to cutting out the upper end side outer shape of the female joint member 4 as it is. However, for the male joint member 3, the slit 32a is processed separately. In the case of cutting out from the plate material, it is further rounded into a cylindrical shape in accordance with the curvature of the steel pipe, and fixed to the joint surface end portions of the steel pipes 1 and 2 as described above.
As described above, the male joint member 3 and the female joint member 4 have a male structure protruding in the axial direction and the circumferential direction within the common peripheral surface and a female structure cut out corresponding thereto. The entire line can be developed on a single plane, and by cutting and separating one plate material, there is little material loss and it can be easily manufactured at low cost.

  The locking convex part 32 of the male joint member 3 corresponds to the locking concave part 42 of the female joint member 4, and the secondary convex part 33 of the male joint member 3 and the secondary concave part 43 of the female joint member 4 Corresponds. The locking recess 42 is formed with a claw groove 42b1 for receiving the claw 32b1 of the locking projection 32 and a claw groove 42c1 for receiving the claw 32c1 of the locking projection 32. As shown in FIG. 2, the engaging convex portion 32 of the male joint member 3 and the engaging concave portion 42 of the female joint member 4 are fitted, and the sub convex portion 33 of the male joint member 3 and the female die are fitted. The sub-recess 43 of the joint member 4 is fitted, and the upper pile 1 and the lower pile 2 are joined.

Description will be made along a connection operation process (FIG. 1 → FIG. 2) in which the joint surface a1 of the upper pile 1 and the joint surface a2 of the lower pile 2 approach and contact each other in the axial direction.
In the connection operation process, the locking recess 42 interferes with the locking projection 32 to cause the locking projection 32 to be deformed, and the locking projection 32 and the locking recess 42 are fitted.
In the joint structure of this embodiment, in the connection operation process, the elastic deformation that reduces the distance between the side portions 32b and 32c with the reduction of the gap of the slit 32a due to the interference of the locking recess 42 is performed. The claw 32 b 1, 32 c 1 is received in the claw grooves 42 b 1, 42 c 1 by the elastic recovery deformation of the locking projection 32 and then the locking projection 32 is fitted into the locking recess 42.
More specifically, when the guide surfaces 32b2 and 32c2 come into contact with the upper edge of the locking recess 42, the gaps of the slit 32a are reduced and the claws 32b1 and 32c1 are retracted as the connection operation proceeds. And the locking surfaces 32b3 and 32c3 reach the claw grooves 42b1 and 42c1 to be released, the gap between the slits 32a is enlarged, and elastic claw deformation occurs so that the claw 32b1 and 32c1 protrude. It is received in the grooves 42b1 and 42c1. Therefore, the width w1 of the front end of the locking projection 32, the opening width w2 of the locking recess 42, and the maximum width w3 between the claws 32b1-32c1 have a magnitude relationship of w1 <w2 <w3. Further, in order to facilitate the deformation of the locking projection 32 when fitted into the locking recess 42, the protrusion length h1 of the locking projection 32 and the depth h2 of the locking recess 42 are h1. It is preferable to have a magnitude relationship of> h2.
As described above, the joint work is performed, and the joint structure of the steel pipes 1 and 2 is completed.
Since the claws 32b1 and 32c1 are received in the claw grooves 42b1 and 42c1, it is possible to secure a bonding force that does not easily pull out. In this case, for example, it is better to stuff the slits 32a after joining, for example, sections cut out during slit processing.

As shown in FIG. 2, the joint surface b (separated into b <b> 1 and b <b> 2 in FIG. 1) that the male joint member 3 and the female joint member 4 abut against each other in the axial direction is the axis between the upper pile 1 and the lower pile 2. It is arranged at a position shifted in the axial direction from the joining surface a (separated into a1 and a2 in FIG. 1) to be abutted in the direction.
In the present embodiment, the joining surface a is shifted from the joining surface b to the male joint member 3 side. With this structure, the upper end portion of the lower pile 2 is inserted and fitted into the cylindrical portion 31 of the male joint member 3. That is, a steel pipe insertion structure is adopted, and a joint that can withstand a shear load and a bending moment can be formed. In addition, you may implement the structure where the joining surface a shifted | deviated from the joining surface b to the female coupling member 4 side, and in that case, the lower end part of the upper pile 1 is inserted in the cylindrical part 41 of the female coupling member 4. The same effect is obtained.
In addition, the fitting between the locking projection 32 and the locking recess 42 as described above forms a joint that can withstand rotational force with respect to rotation in any direction around the axis. It is strengthened by being fitted in 43.

  In the present embodiment, the claws 32b1 and 32c1 are provided in pairs on both the side portions 32b and 32c, but only one of them can be joined. In the case of one side, it is good to design the projection amount of the nail relatively long and to ensure the pulling resistance force appropriately.

[Second Embodiment]
Next, a joint structure shown in FIG. 3 will be described as a second embodiment.
In the present embodiment, a locking convex portion 34 and a locking concave portion 44 shown in FIG. 3 are applied in place of the locking convex portion 32 and the locking concave portion 42 of the first embodiment. The rest of the structure is the same. In FIG. 3, the cylindrical portions 31 and 41 have the same reference numerals as those in FIGS.

  As in the first embodiment, the locking projection 34 has a slit 34a and both side portions 34b and 34c. As shown in FIG. 3A, the side portions 34b and 34c are not formed with claws. The outer end surfaces of the side portions 34b and 34c are the pressing surfaces 34b1 and 34c1. Further, guide surfaces 34b2 and 34c2 that are opened obliquely are formed at the opening end of the slit 34a.

The locking recess 44 has a guide portion 44a protruding in the axial direction from the bottom.
The opening width of the locking recess 44 is set to be slightly larger than the width of the locking projection 34, and the locking projection 34 can be inserted into the locking recess 44.
Both inner side portions 44b and 44c of the locking recess 44 are inclined so as to be farther away from each other. Guide surfaces 44b2 and 44c2 that are formed obliquely corresponding to the guide surfaces 34b2 and 34c2 are formed on both sides of the distal end of the guide portion 44a, and the guide portion 44a smoothly spreads and enters the slit 34a. Has been.
The tip of the guide portion 44a is located behind the opening end of the locking recess 44, and acts on the locking protrusion 34 inserted into the locking recess 44. The guide portion 44a passes through the slit 34a. The pressing surfaces 34b1 and 34c1 are configured to press both inner portions 44b and 44c in accordance with the deformation of the locking convex portion 34 based on the action of spreading.

Similar to the first embodiment, the connection operation process (FIG. 3 (a) → FIG. 3 (b)) will be described.
In the connection operation process, the guide portion 44a of the locking concave portion 44 interferes with the slit 34a of the locking convex portion 34 to cause deformation of the locking convex portion 34, so that the locking convex portion 34 and the locking concave portion 44 are formed. Mating.
In the joint structure of the present embodiment, in the connection operation process, the guide portion 44a is deformed to increase the distance between the side portions 34b and 34c with the enlargement of the gap of the slit 34a due to the penetration into the slit 34a. The locking projection 34 is fitted into the locking recess 44 in a state where the pressing surfaces 34b1 and 34c1 of the both side portions 34b and 34c are pressed against both inner side portions 44b and 44c of the locking recess 44. .
The axial force that presses the upper pile 1 against the lower pile 2 is converted into a force by which the pressing surfaces 34b1 and 34c1 press both inner portions 44b and 44c by the interference between the guide portion 44a and the slit 34a, and is firmly joined. .
The deformation that the both side portions 34b and 34c open as described above may occur in the elastic region, or may be accompanied by plastic deformation. By increasing the amount of plastic deformation, it is possible to secure a joining force that is not easily pulled out by so-called fitting.
Similar to the first embodiment, the fitting between the locking convex portion 34 and the locking concave portion 44 forms a joint portion that can withstand rotational force with respect to rotation in any direction around the axis. Is strengthened by being fitted into the sub-recess 43.

According to the above-described embodiment of the present invention, since the joining is completed only by the connecting operation in which the joining surface a1 of one steel pipe 1 and the joining surface a2 of the other steel pipe 2 approach and contact each other in the axial direction. Other connecting members and tools are not required and can be installed quickly and easily.
It can be applied to all steel pipe piles without being affected by the weather. In particular, it can be easily connected even when there is an overhead restriction such as underground construction or bridge substructure, and even when the connection location is underwater.

Regardless of the embodiment of the present invention described above, the male joint member 3 and the female joint member 4 may be used upside down. That is, the male joint member 3 can be turned upside down and fixed to the lower pile 2, and the female joint member 4 can be turned upside down and fixed to the upper pile 1.
In addition, it is good to perform the welding fixation to the steel pipe of the male coupling member 3 on the opposite end surface with respect to the joint surface b1. Similarly, the welding fixing of the female joint member 4 to the steel pipe may be performed on the end surface on the opposite side to the joint surface b2.

1 Upper pile (steel pipe)
2 Lower pile (steel pipe)
3 Male joint member 4 Female joint member 31 Cylindrical part 32 Locking convex part 32a Slit 32b, 32c Both sides 32b1, 32c1 Claw 34 Locking convex part 34a Slit 34b, 34c Both side part 42 Locking concave part 42b1, 42c1 Claw groove 44 Locking recess 44a Guide portions 44b and 44c, both inner sides a Joining surface a1 Joining surface a2 Joining surface b Joining surface b1 Joining surface b2 Joining surface

Invention of Claim 1 for solving the above subject is the joint structure of the steel pipe which joins two steel pipes in the axial direction,
Of the two steel pipes, a male joint member fixed on the peripheral surface of the joining surface of one steel pipe, and a female joint member fixed on the peripheral surface of the joint surface of the other steel pipe Prepared,
The female joint member has a plurality of recesses arranged at intervals in the circumferential direction and notched inward in the axial direction,
The male joint member has a plurality of convex portions that are arranged at intervals in the circumferential direction and project outward in the axial direction.
The convex portion has a slit that is cut in the axial direction from the tip thereof, and both side portions in the circumferential direction are displaced in the circumferential direction along with expansion / contraction of the gap between the slits. Deformation to enlarge / reduce the distance,
And bonding surface of the pre-SL one of the steel pipe, close to the joint surface of the other steel pipe in the axial direction, the connection operation process of the abutment, the recess to bring about the deformation by interfering with the projections it is a joint structure of a steel pipe that match fit with the convex portion.

Claims (4)

A steel pipe joint structure for joining two steel pipes in the axial direction,
Of the two steel pipes, a male joint member fixed on the peripheral surface of the joining surface of one steel pipe, and a female joint member fixed on the peripheral surface of the joint surface of the other steel pipe Prepared,
The male joint member has a plurality of convex portions that are arranged at intervals in the circumferential direction and project outward in the axial direction.
The convex portion has a slit that is cut in the axial direction from the tip thereof, and can be deformed by enlarging / reducing the distance between both side portions in the circumferential direction with enlargement / reduction of the gap of the slit. And
The female joint member causes the deformation by interfering with the convex portion in the connecting operation process in which the joining surface of the one steel pipe and the joining surface of the other steel pipe are approached and contacted in the axial direction. A steel pipe joint structure having a recess that fits with the protrusion.   A position where the joint surface that the male joint member and the female joint member abut in the axial direction is shifted in the axial direction from the joint surface that the one steel pipe and the other steel pipe abut in the axial direction. The steel pipe joint structure according to claim 1, wherein the steel pipe joint structure is arranged in a vertical direction. A claw protruding in the circumferential direction is formed on either one or both of the both side portions of the convex portion, and a claw groove for receiving the claw is formed in the concave portion,
In the connecting operation process, due to the elastic recovery deformation of the convex portion after causing the convex portion to undergo elastic deformation that reduces the distance between the two side portions with the reduction of the gap of the slit due to interference of the concave portion, The steel pipe joint structure according to claim 1 or 2, wherein a claw is received in the claw groove and the convex part is fitted into the concave part. The concave portion has a guide portion protruding in the axial direction from the bottom portion,
In the connection operation process, the convex portion is deformed to increase the distance between the two side portions with the enlargement of the gap between the slits due to the penetration of the guide portion into the slit. The steel pipe joint structure according to claim 1 or 2, wherein the convex portion is formed in a structure that fits into the concave portion in a state of being pressed against both inner portions.

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