JP2016148198A - Removal jig and removal method of bayonet joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a removal jig and a removal method of a bayonet joint capable of removing a bayonet joint after once being joined.SOLUTION: A removal jig 1 of a bayonet joint includes: a ring member 3 which can be disposed along the outer periphery of an outer joint tube, and which has screw holes of the same number of through holes formed in the outer joint tube: a set screw 5 which is screwed into a bolt hole formed in each of divided parts of an inner joint tube; and a bolt screw 7 which has a curved convex surface 13 on the front end, and which is screwed into a screw hole formed in the ring member 3 and can be inserted into the hole formed in the outer joint tube. With this, the bolt holes on the inner joint tube are closed by the set screws 5, and when a bolt screw 7 is inserted through the screw hole of the ring member 3 which is disposed on the outer periphery of the outer joint tube to push the set screw 5, to thereby release the engagement between the inner joint tube and the outer joint tube. After that, the joint can be easily removed by simply sliding the inner joint tube and the outer joint tube in an axial direction of the tube.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an insertion joint removing jig comprising an outer joint pipe provided at a joint end of one steel pipe to be joined and an inner joint pipe provided at a joint end of the other steel pipe to be joined. And a removal method.

There is one disclosed in Patent Document 1 as an insertion joint of a steel pipe pile that does not require a separate split cylindrical joint and is excellent in transportability and workability.
As shown in FIG. 7 and FIG. 8, the insertion joint 14 disclosed in Patent Document 1 is provided with an outer joint pipe 17 and an inner joint pipe 19 at the joint end of the steel pipe 15 to be joined. A joint structure of the steel pipe 15 for connecting the steel pipe 15 by inserting the joint pipe 17 and the inner joint pipe 19 into each other in the pipe axis direction,
The inner joint pipe 19 is formed on the inner peripheral surface of the outer joint pipe 17 and the slits 21 formed on the outer peripheral surface of the inner joint pipe 19 and the slits 21 that divide them into a plurality of circumferential directions. In the state in which the inner joint pipe 19 is inserted into the outer joint pipe 17, the engagement part 25 that engages with the convex part 23 in a state in which 19 is inserted into the outer joint pipe 17 and resists the tensile load together with the convex part 23. And a contact portion 27 that resists a compressive load ”(see claim 1 of Patent Document 1).

  In the above joint structure, the outer diameter of the portion of the inner joint pipe 19 where the convex portion 23 is formed is set larger than the minimum inner diameter of the outer joint pipe 17, and the inner joint pipe 19 is inserted into the outer joint pipe 17. In the middle of doing, the convex part 23 press-contacts with the inner peripheral surface of the outer joint pipe 17, and the side in which the slit 21 was formed among the outer joint pipe 17 or the inner joint pipe 19 bends in an inner diameter direction, and an insertion completion state is carried out. , The bending portion returns and the convex portion 23 engages with the engaging portion 25, and the bolt 31 is inserted into the through hole 29 formed in the outer joint pipe 17, so that each divided portion of the inner joint pipe 19 and the outer joint pipe are inserted. 17 is bolted.

JP 2004-36329 A

Such a joint is used to join a steel pipe pile by joining the steel pipe pile and joining the joint part in the middle of placing the steel pipe pile.
After joining the steel pipe piles, there is a case where it is desired to release the joining when some trouble occurs during the construction.
However, in the joint joint, when the joining is completed, the convex portion 23 formed on the outer peripheral surface of the inner joint pipe 19 and the engagement portion of the outer joint pipe 17 are engaged, and only by applying a tensile load. , Can not be disengaged. For this reason, after joining once, since there is no means to cancel joining, there is a problem that a steel pipe pile must be cut and a steel pipe pile and a joint cannot be reused.

  The present invention has been made to solve such a problem, and removes an insertion joint that releases the engagement between the convex portion and the engagement portion of the insertion joint, and can be removed after being joined once. It is intended to provide a jig and removal method.

(1) The insertion joint removing jig according to the present invention is provided at the outer joint pipe provided at the joining end of one steel pipe to be joined and at the joining end of the other steel pipe to be joined. An insertion joint comprising an inner joint pipe, wherein the inner joint pipe is divided into a plurality of circumferential directions by a plurality of slits extending in a pipe axis direction of the inner joint pipe, and has a convex portion on an outer peripheral surface, The joint pipe has a through-hole corresponding to the number of divisions of the inner joint pipe on the peripheral surface, and an engagement portion that engages the convex portion in a state where the inner joint pipe is inserted into the outer joint pipe on the inner peripheral surface thereof. Having
A difference in which a bolt is inserted into a through hole formed in the outer joint pipe in a state where the inner joint pipe is inserted into the outer joint pipe, and each divided portion of the inner joint pipe and the outer joint pipe are bolted. A jig for removing a plug joint used for removing a joint of a plug joint,
A ring member that can be disposed along the outer periphery of the outer joint pipe and has at least the same number of screw holes as the through holes formed in the outer joint pipe, and a bolt hole formed in each divided portion of the inner joint pipe And a bolt screw that has a curved surface portion with a convex tip, can be screwed into the screw hole of the ring member, and can be inserted into the through hole formed in the outer joint pipe. It is characterized by.

(2) Moreover, in the thing as described in said (1), the said ring member connects one end of two semicircle members so that rotation is possible, and connects the other ends to the other end of the said member. The connection part to provide is provided.

(3) Moreover, the removal method of the insertion joint which concerns on this invention is a removal method of the insertion joint using the removal jig of the insertion joint as described in said (1) or (2),
Removing the bolt from the outer joint pipe, inserting a set screw from the through hole and screwing it into the bolt hole of each of the divided parts of the inner joint pipe, and closing the bolt hole;
The ring member is arranged on the outer peripheral portion of the outer joint pipe, the bolt screw is inserted into a screw hole formed in the ring member, and the set screw is pressed, so that the divided portion is bent inward. A step of disengaging the convex portion and the engaging portion;
A step of separating the inner joint pipe and the outer joint pipe by displacing them in the pipe axis direction.

  The insertion joint removing jig of the present invention can be arranged along the outer periphery of the outer joint pipe, and each of the inner joint pipe and the ring member having the same number or more screw holes as the through holes formed in the outer joint pipe. A set screw which is screwed into a bolt hole formed in the divided portion, and a curved surface portion having a convex tip, is screwed into the screw hole 9 of the ring member and is formed in the through hole formed in the outer joint pipe The bolt hole of the inner joint pipe is closed with a set screw, and the bolt screw is inserted from the screw hole of the ring member arranged on the outer peripheral portion of the outer joint pipe. By pushing the screw, the inner joint pipe and the outer joint pipe can be disengaged, and then the joint can be removed by simply shifting the inner joint pipe and the outer joint pipe in the tube axis direction. In this way, it is possible to remove the joint of the plug joint by an easy operation from the outside of the plug joint and reuse the plug joint.

It is explanatory drawing of the removal jig | tool of the insertion joint which concerns on one embodiment of this invention. 2 (a) showing a part of the ring member constituting the jig for removing the insertion joint shown in FIG. 1, and FIG. 2 (b) showing a cross section taken along the line BB in FIG. 2 (a). It is. It is explanatory drawing of the removal method of the insertion joint which concerns on one embodiment of this invention (the 1). It is explanatory drawing of the removal method of the insertion joint which concerns on one embodiment of this invention (the 2). It is explanatory drawing of the removal method of the insertion joint which concerns on one embodiment of this invention (the 3). It is explanatory drawing of the removal method of the insertion joint which concerns on one embodiment of this invention (the 4). It is explanatory drawing of the insertion joint which this invention makes the object of removal. It is arrow AA sectional drawing of FIG.

The insertion joint 14 to be removed by the jig 1 for removing the insertion joint 14 according to the embodiment of the present invention is described in Patent Document 1 shown in FIGS.
An insertion joint removal jig 1 according to an embodiment of the present invention (hereinafter simply referred to as “removal jig 1”) is a ring member that can be disposed along the outer periphery of an outer joint pipe 17 as shown in FIG. 3, a set screw 5 that is screwed into a bolt hole 33 formed in each divided portion of the inner joint pipe 19, and a curved surface portion 13 having a convex tip, and is screwed into the screw hole 9 of the ring member 3. And a bolt screw 7 that can be inserted into a through hole 29 formed in the outer joint pipe 17.
Hereinafter, each component will be described in detail.

<Ring member>
As shown in FIG. 1A and FIG. 2, the ring member 3 can be arranged along the outer periphery of the outer joint pipe 17 and has as many screw holes 9 as the number of through holes 29 formed in the outer joint pipe 17. It is a ring-shaped member.
More specifically, one end of two semicircular members is connected so as to be rotatable, and the other end is connected by a connecting member 11.
The screw hole 9 formed in the ring member 3 has a smaller diameter than the through hole 29 formed in the outer joint pipe 17. This is because the bolt screw 7 screwed into the screw hole 9 can be inserted through the through hole 29 of the outer joint pipe 17.
In addition, the shape of the ring member 3 of this invention is not limited to the above thing, What is necessary is just to become the ring shape integrated in the state which can be arrange | positioned along the outer periphery of the outer joint pipe | tube 17, and has arrange | positioned.
Here, the term “integration” means that the ring member does not move due to its own weight in the arranged state.

<Set screw>
As shown in FIG. 1B, the set screw 5 has a cylindrical shape, and is screwed into a bolt hole 33 formed in each divided portion of the inner joint pipe 19 to close the bolt hole 33. is there. The set screws 5 are required by the number of bolt holes 33 formed in the inner joint pipe 19.
In addition, FIG.1 (b-1) is the figure which made the edge part of the set screw 5 the front, and FIG.1 (b-2) is a side view.

<Bolt screw>
As shown in FIG. 1C, the bolt screw 7 has a curved surface portion 13 having a convex tip, and is screwed into the screw hole 9 of the ring member 3 and is inserted into a through hole 29 formed in the outer joint pipe 17. It is possible.
If the diameter of the bolt screw 7 is large, the shaft rigidity becomes high, and the bolt screw 7 is difficult to deform. Therefore, the joint can be deformed more efficiently. Therefore, if the diameter of the bolt screw 7 is larger, the workability is good.
The reason why the convex curved surface portion 13 is provided at the tip of the bolt screw 7 is to reduce the friction between the curved surface portion 13 and the set screw 5 or the inner joint pipe 19 when the insertion joint 14 described later is removed. is there.
It is more desirable to attach a member having a small coefficient of friction such as a fluororesin to the tip of the bolt screw 7.

A method for removing the insertion joint 14 using the insertion joint removal jig 1 configured as described above will be described below.
The bolt 31 is removed from the outer joint pipe 17, and as shown in FIG. 3, the set screw 5 is inserted from the bolt hole 33 and screwed into the bolt hole 33 of each divided portion of the inner joint pipe 19. Block it.

Next, as shown in FIG. 4, the ring member 3 is disposed on the outer peripheral portion of the outer joint pipe 17, and the connecting portions are connected and integrated. Then, as shown in FIG. 5, the position of the screw hole 9 of the ring member 3 and the position of the through hole 29 of the outer joint pipe 17 are matched.
In this state, as shown in FIG. 6, the bolt screw 7 is inserted into the screw hole 9 from the outside of the ring member 3. When the bolt screw 7 is screwed in, as shown in FIG. 6A, the tip of the bolt screw 7 is inserted into the through hole 29 of the outer joint pipe 17, and when further screwed, the curved surface portion 13 at the tip of the bolt screw 7 contacts the set screw 5. Touch. When the bolt screw 7 is further screwed in this state, as shown in FIG. 6B, each divided portion of the inner joint pipe 19 is pushed inward, and the convex portion 23 of the inner joint pipe 19 and the outer joint pipe 17 are The engagement portion 25 is disengaged.
Such an operation of releasing the engagement between the inner joint pipe 19 and the outer joint pipe 17 is performed in the divided portions of all the inner joint pipes 19.
It is preferable that each bolt screw 7 is screwed in while adjusting so that the inner joint pipe 19 is not excessively deformed and the inner joint pipe 19 is evenly pushed inward.
As shown in FIG. 6 (c), the inner joint pipe 19 is disengaged in the axial direction as shown in FIG. Can do.

  When the divided parts of the inner joint pipe 19 are pushed in with the bolt screw 7, a reaction force acts so as to push the ring member 3 outward from the inner side via the bolt screw 7, but this reaction force is integrated. Since the ring member 3 acts simultaneously on the ring member 3 from a plurality of positions in the circumferential direction, the ring member 3 only needs to have a strength sufficient to withstand the tensile force in the circumferential direction.

  As described above, by using the insertion joint removal jig 1 according to the present embodiment, the insertion joint 14 can be disconnected by an easy operation from the outside of the insertion joint 14. Can be reused.

DESCRIPTION OF SYMBOLS 1 Removal jig 3 Ring member 5 Set screw 7 Bolt screw 9 Screw hole 11 Connecting member 13 Curved surface part 14 Insertion joint 15 Steel pipe 17 Outer joint pipe 19 Inner joint pipe 21 Slit 23 Projection part 25 Engagement part 27 Contact part 29 Through-hole 31 bolt 33 bolt hole

Claims (3)

An insertion joint comprising an outer joint pipe provided at a joint end of one steel pipe to be joined and an inner joint pipe provided at a joint end of the other steel pipe to be joined, the inner joint The pipe is divided into a plurality of circumferential directions by a plurality of slits extending in the pipe axis direction of the inner joint pipe and has a convex portion on the outer peripheral surface, and the outer joint pipe is a through hole corresponding to the number of divisions of the inner joint pipe And an engaging portion that engages with the convex portion in a state where the inner joint pipe is inserted into the outer joint pipe.
A difference in which a bolt is inserted into a through hole formed in the outer joint pipe in a state where the inner joint pipe is inserted into the outer joint pipe, and each divided portion of the inner joint pipe and the outer joint pipe are bolted. A jig for removing a plug joint used for removing a joint of a plug joint,
A ring member that can be disposed along the outer periphery of the outer joint pipe and has at least the same number of screw holes as the through holes formed in the outer joint pipe, and a bolt hole formed in each divided portion of the inner joint pipe And a bolt screw that has a curved surface portion with a convex tip, can be screwed into the screw hole 9 of the ring member, and can be inserted into the through hole formed in the outer joint pipe. An insertion joint removal jig characterized by that.   2. The ring member according to claim 1, wherein one end of two semicircular members is rotatably connected, and a connecting portion for connecting the other ends to the other end of the member is provided. Plug fitting removal jig. A method for removing an insertion joint using the insertion joint removal jig according to claim 1 or 2,
Removing the bolt from the outer joint pipe, inserting a set screw from the through hole and screwing it into the bolt hole of each divided portion of the inner joint pipe, and closing the bolt hole;
The ring member is arranged on the outer peripheral portion of the outer joint pipe, the bolt screw is inserted into a screw hole formed in the ring member, and the set screw is pressed, so that the divided portion is bent inward. A step of disengaging the convex portion and the engaging portion;
And a step of separating the inner joint pipe and the outer joint pipe by shifting them in the pipe axis direction.