JP2012046952A - Method for separating coupled columnar body, and columnar body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable releasing of coupled columnar bodies by moving a key member.SOLUTION: A method for separating coupled columnar bodies includes: comprising a key member 7 to be mounted across an inner-facing peripheral groove 5 and an outer-facing peripheral groove 6 with an externally-fitted pipe part 2 and an internally-fitted column part 3 mutually coupled; forming the key member 7 so as to be housed in the state of being inwardly retracted from an entrance of either the inner-facing peripheral groove 5 or the outer-facing peripheral groove 6; providing an operating bolt A for moving the key member 7 from a state of being inwardly retracted in the inner-facing peripheral groove 5 or the outer-facing peripheral groove 6 to a state of coming across the inner-facing peripheral groove 5 and the outer-facing peripheral groove 6; providing a communication part allowing communication between the inner-facing peripheral groove 5 and an outside of the externally-fitted pipe part 2; pouring cleaning water into the inner-facing peripheral groove 5 via the communication part, thereby flushing out a solid matter entering the inner-facing peripheral groove 5 or the outer-facing peripheral groove 6; and retracting the key member 7 inward the inner-facing peripheral groove 5 by operating the operating bolt A, followed by separating the adjacent columnar bodies.

Description

  In the present invention, an outer fitting tube portion and an inner fitting column portion are provided separately at both ends, and an inward circumferential groove is formed on the inner circumferential side of the outer fitting tube portion. An outer circumferential groove is formed on the outer peripheral side of the fitting column portion, and the outer fitting tube portion and the inner fitting column portion are configured to be fitted and connectable between different columnar bodies, and the outer fitting A key member mounted over the inward circumferential groove and the outward circumferential groove in a state in which the pipe portion and the inner fitting column portion are fitted to each other, and the inward circumferential groove or the outer The key member can be accommodated in a state where the key member is retracted from the entrance of the facing circumferential groove to the back, and the key member is accommodated in the inward circumferential groove from the state of being accommodated in the inward circumferential groove or the outward circumferential groove. An operation bolt is provided to move and move between the groove and the outward circumferential groove, and the operation bolt can be operated from the outside of the outer fitting tube portion. A plurality of columnar bodies provided on the outer fitting tube portion are attached to the outer fitting tube portion by fitting the outer fitting tube portion and the inner fitting column portion to each other. A connecting columnar separation method for separating a plurality of the columnar bodies in the coupling columnar body after the key member is mounted in a state extending between the facing circumferential groove and the outward circumferential groove to form a coupling columnar body, and It relates to the columnar body.

The columnar body has advantages in that the connecting work can be performed in a short time as compared with the connecting method by welding the columnar bodies, and that a skilled welder is unnecessary and the workability is good.
Therefore, in the conventional columnar body, a female screw hole that can be freely screwed into the operation bolt is provided in the outer fitting tube portion and formed in the bolt mounting portion (for example, see Patent Document 1). .

Japanese Patent No. 3336430

  When connecting a plurality of the above-mentioned conventional columnar bodies to form a coupled columnar body, for example, when performing a work of standing in the ground as a pile or the like, pull out the connected columnar body that has stood in the ground for correction etc. When the connection part between the columnar bodies in the coupled columnar body is to be released, the construction site is in a use environment such as bentonite or other muddy water or soil cement. Mud and sand intrude into and adhere to the gap between them, which makes it impossible to move the key member with the operation bolt at the bolt mounting part, and the fitting connection state between the outer fitting pipe part and the inner fitting column part There was a problem that could not be released.

  Therefore, the object of the present invention is to eliminate the above-mentioned problems and to connect the columnar bodies by moving the key member again even in a use environment where muddy water or sand intrudes into the connecting portions of the columnar bodies. It is in place to be able to cancel.

  The characteristic structure of the separation method of the 1st connection columnar body in this invention distributes and provides the pipe part for external fitting and the pillar part for internal fitting in both ends, The inner peripheral side of the said pipe part for external fitting is on the inner peripheral side. An inward circumferential groove is formed, an outer circumferential groove is formed on the outer peripheral side of the inner fitting column portion, and the outer fitting tube portion and the inner fitting column portion are formed between different columnar bodies. Between the inner circumferential groove and the outer circumferential groove in a state where the outer fitting pipe part and the inner fitting column part are fitted to each other. A key member is formed so that the key member can be accommodated in a state in which the key member is retracted from the entrance of the inward circumferential groove or the outward circumferential groove, and the key member is formed in the inward circumferential groove or the outward circumferential groove. An operation bolt is provided that moves from the state housed in the groove to the state between the inward circumferential groove and the outward circumferential groove. A plurality of columnar bodies provided on the outer fitting tube portion, and a bolt mounting portion for attaching a bolt operably from the outside of the outer fitting tube portion, and the inner fitting tube portion and the inner After the fitting column parts are fitted to each other and the key member is mounted in a state extending between the inward circumferential groove and the outward circumferential groove to form a coupling columnar body, a plurality of the coupling columnar bodies are formed. A connecting columnar body separation method for separating the columnar bodies from each other, wherein the columnar body is provided with an insertion portion that allows the inward circumferential groove and the outside of the outer fitting tube portion to communicate with each other. In a state where the columnar bodies are fitted and connected to each other, cleaning water is injected into the inward circumferential groove through the insertion portion, and the cleaning water in the inward circumferential groove or in the outward circumferential groove Wash out the solid matter that has penetrated into the bolt and operate the operation bolt at the bolt mounting part. It said key member after being retired at the back of the inward circumferential grooves, there is to be separated pull the column bodies adjacent to each other.

According to the first characteristic configuration of the present invention, washing water is injected through the insertion portion to wash out the solid matter that has entered the inward circumferential groove or the outward circumferential groove, so that less labor is required. The moving operation of the key member by the operation bolt can be smoothly performed, and the key member is retracted to the back of the inward circumferential groove, and the adjacent columnar bodies in the connecting columnar body are separated and separated. it can.
Therefore, by using the connecting columnar bodies, even if mud, sand or the like enters the fitting connection portion between the columnar bodies, the columnar bodies can be easily separated by operating the key member well.

  According to a second characteristic configuration of the present invention, the connecting columnar body is embedded in the ground after connecting the plurality of columnar bodies, and when the columnar bodies are separated from each other, After pulling out and bringing out the fitting connection part between the columnar bodies to the ground, after washing by injecting cleaning water into the inward circumferential groove through the insertion part, the adjacent columnar bodies are separated from each other. There is something to separate.

  According to the second characteristic configuration of the present invention, after a plurality of columnar bodies are once fitted and connected to form a connected columnar body, even after the connected columnar body is stood in the soil, By pulling out the connecting columnar bodies, the columnar bodies are separated from each other, and it is now possible to easily correct the standing construction into the soil while performing the connecting operation again.

  The characteristic configuration of the third columnar body of the present invention is such that an outer fitting tube portion and an inner fitting column portion are provided separately at both ends, and an inward circumferential groove is provided on the inner circumferential side of the outer fitting tube portion. And an outer circumferential groove is formed on the outer peripheral side of the inner fitting column portion, and the outer fitting tube portion and the inner fitting column portion are fitted between different columnar bodies. A key member configured to be connectable and mounted across the inward circumferential groove and the outward circumferential groove in a state where the outer fitting pipe portion and the inner fitting column portion are fitted to each other. The key member can be accommodated in a state where the key member is retracted from the entrance of the inward circumferential groove or the outward circumferential groove, and the key member is disposed in the inner side of the inward circumferential groove or the outer circumferential groove. An operating bolt is provided to move and move from the accommodated state to the state between the inward circumferential groove and the outward circumferential groove, and the operating bolt is connected to the outer fitting tube. A bolt mounting portion that is operably attached from the outside of the tube is a columnar body provided in the external fitting tube portion, and the inward circumferential groove and the external fitting tube portion are attached to the operation bolt attached to the bolt mounting portion. There is an insertion part that allows communication with the outside of the.

According to the third characteristic configuration of the present invention, the key member spans the inward circumferential groove and the outward circumferential groove in a state where the outer fitting tube portion and the inner fitting column portion of the columnar bodies are fitted. Even if it is mounted at the position, the operation bolt for moving the key member is provided with an insertion portion that allows the inward circumferential groove and the outside of the outer fitting tube portion to communicate with each other. If the cleaning water is allowed to enter through the, mud, sand, etc. adhering to the inward circumferential groove or the gap between the outward circumferential groove and the key member can be washed out.
Accordingly, the columnar bodies can be separated by simply moving the key member.

  According to a fourth characteristic configuration of the present invention, the operation bolt includes a bolt main body and a nut screwed into a head of the bolt main body, and a through hole into which the nut is fitted is formed in the outer fitting pipe portion. The insertion portion is formed by holding the nut so as to be detachable from the through hole and removing the nut from the through hole and the bolt body.

According to the 4th characteristic structure of this invention, since the said insertion part can be formed by removing the said nut from the said through-hole and the said bolt main body, a nut is removed and cleaning water penetrate | invades from the said insertion part If it does, mud, sand, etc. adhering to the gap between the inward circumferential groove or the outward circumferential groove and the key member can be washed out.
Therefore, when connecting the columnar bodies, it is possible to prevent the intrusion of muddy water and other solid matter from the insertion portion into the periphery of the key member due to the presence of the nut, and the cleaning is performed through the insertion portion formed by removing the nut. Water can be cleaned by allowing water to enter the gap between the inward circumferential groove or the outward circumferential groove and the key member.

  According to a fifth characteristic configuration of the present invention, a male screw portion is formed on the outer peripheral portion of the nut, and a female screw portion into which the male screw portion is screwed is formed in the through hole.

  According to the fifth characteristic configuration of the present invention, the nut having the male screw portion formed on the outer peripheral portion can be easily and reliably fixed to the through screw with respect to the female screw portion.

  According to a sixth feature of the present invention, the nut is fitted in the nut so as to be slidable in the axial direction with respect to the through hole, and can be prevented from rotating in a state in which the nut is fitted in the through hole. A mechanism is provided, and a stopper that prevents the nut from coming off from the through hole is detachably provided in the through hole.

  According to the sixth characteristic configuration of the present invention, the nut can be easily taken out from the through hole by removing the stopper. In addition, since the internally fitted nut is held in the through hole by the anti-rotation mechanism, the operation bolt is rotated to rotate the key without rotating the nut in the through hole. The movement operation of a member can be performed reliably.

  According to a seventh characteristic configuration of the present invention, in the state where the nut is fitted in the through hole, an insertion portion that faces the key member from the outside of the outer fitting tube portion is provided between the nut and the through hole. The nut is molded to form in between

  According to the seventh characteristic configuration of the present invention, the inner circumferential groove or the outer circumferential groove and the key member are inserted through the insertion portion formed between the nut and the through hole without removing the nut from the through hole. It is possible to wash out mud or sand adhering to the gaps between the wash water, and to move the key member for separating the columnar bodies more easily.

  According to an eighth characteristic configuration of the present invention, a through hole for fitting the head of the operation bolt is provided in the pipe portion for external fitting, a male screw portion is provided in the head of the manipulation bolt, and the male screw portion is An internal thread portion to be screwed is provided in the through hole, and the insertion portion is formed in the head of the operation bolt.

  According to the eighth characteristic configuration of the present invention, when the connection between the columnar bodies is released while the retraction operation of the key member can be performed only by attaching the operation bolt to the bolt mounting portion, the head of the operation bolt is attached. If the cleaning water is allowed to enter the gap between the inward circumferential groove or the outward circumferential groove and the key member through the formed insertion portion, the attached mud and sand can be easily washed out, and there is little The operation of moving the key member with the operation bolt can be performed with ease, and the connection between the columnar bodies can be released.

  According to a ninth feature of the present invention, a cleaning water discharge path that has entered the inward circumferential groove through the insertion portion is provided in at least one of the outer fitting pipe portion or the inner fitting column portion. It is where it is formed.

  According to the ninth characteristic configuration of the present invention, since the cleaning water that enters the inward circumferential groove through the insertion portion is discharged from the discharge path, the cleaning water flows smoothly, and the cleaning water flows. Along with this, solids such as mud and sand that have entered the inward circumferential groove and the outward circumferential groove are discharged, and the key member can be moved well.

The longitudinal cross-sectional view of the pipe part for external fitting and the column part for internal fitting in a columnar body is shown, (a) shows the state after both connection, (b) shows the state after both fitting connection. It is a disassembled perspective view of the principal part. (A)-(f) is a longitudinal action explanatory view for connection operation in a bolt mounting part. (A)-(c) is a longitudinal action explanatory view at the time of washing in a bolt mounting part. (D)-(f) is a longitudinal action explanatory view at the time of separation operation of columnar bodies in a bolt mounting part. It is a principal part disassembled perspective view of another embodiment. (a) is a perspective view of the nut of another embodiment, (b) is a perspective view at the time of nut mounting of another embodiment. It is a principal part longitudinal cross-sectional view of another embodiment in the columnar body at the time of bolt mounting | wearing. It is a principal part longitudinal cross-sectional view of another embodiment in the columnar body at the time of bolt mounting | wearing. It is a perspective view of the operation bolt of another embodiment. It is a perspective view of the operation bolt of another embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1 (a) to FIG. 1 (b), an outer fitting pipe portion 2 and an inner fitting pipe are formed as joints similarly formed of a steel pipe at both ends of a columnar body main body portion 1 formed of a steel pipe. The column part 3 is distributed and welded to form a columnar body 4 as a whole, and a plurality of columnar bodies 4 are connected to each other to form a connected columnar body. Columnar bodies are used as steel pipe sheet piles for earth retaining wall formation and steel pipe support piles for building support.

A plurality of inward circumferential grooves 5 are formed in the axial direction on the inner peripheral side of the outer fitting tube portion 2, and an outer circumferential groove 6 is provided on the outer peripheral side of the inner fitting column portion 3. A plurality of outer fitting tube portions 2 and inner fitting column portions 3 are formed so as to be able to be fitted and connected between different columnar bodies 4, and the outer fitting tube portion 2 and the inner fitting column portion are formed. 3 are provided with a plurality of steel arcuate key members 7 to be mounted across the inward circumferential groove 5 and the outward circumferential groove 6 from the entrance of the inward circumferential groove 5. The key member 7 is formed so as to be accommodated in a state of being retired to the back,
An operation bolt A is provided for moving the key member 7 from the state in which the key member 7 is housed in the inward circumferential groove 5 to the state between the inward circumferential groove 5 and the outward circumferential groove 6. Bolt mounting portions 9 that are operably attached from the outside of the fitting tube portion 2 are provided at a plurality of locations in the circumferential direction of the outer fitting tube portion 2.

  As shown in FIG. 2, the operation bolt A attached to the bolt mounting portion 9 is composed of a bolt main body 8 and a nut 10 screwed into the head of the bolt main body 8, and a through hole into which the nut 10 is fitted. 11 is formed in the outer fitting tube portion 2, and a male screw portion 12 is formed on the outer peripheral portion of the nut 10 so that the nut 10 is detachably held in the through hole 11, and the female screw portion 12 is screwed into the female screw portion. 13 is formed in the through-hole 11, and further, a C-shaped stopper 14 that prevents the nut 10 from coming off from the through-hole 11 while preventing the nut 10 from being fitted in the through-hole 11 is provided in the through-hole 11. The inner groove 26 is detachably locked. That is, if the nut 10 is removed from the through hole 11, the cleaning water is injected into the gap between the through hole 11 and the bolt body 8 so that the inward circumferential groove 5 and the outside of the fitting tube portion 2 can communicate with each other. The insertion part for is formed.

  The stopper 14 may not be provided as shown in FIG. Further, as shown in FIG. 9, a holding plate 27 may be interposed between the stopper 14, the nut 10, and the bolt body 8.

The bolt body 8 is provided with a right-hand screw type first male screw portion 15 and a left-hand screw type second male screw portion 16 at both ends thereof to constitute reverse screws, and the first male screw portion 15 An operation portion 17 that can be rotated by a hexagon wrench is provided at the end.
The female screw portion 19 of the nut 10 is screwed to the first male screw portion 15, and the second male screw portion 16 is screwed to the female screw portion 18 formed on the key member 7. Accordingly, when the bolt body 8 screwed into the nut 10 is rotated clockwise, the bolt body 8 moves closer to the outward circumferential groove 6 and the key member 7 further outwards with respect to the bolt body 8. Enter and move to the circumferential groove 6 side.

(The procedure for attaching the key member 7 to the columnar body 4 will be described.) (FIGS. 3A to 3F)
1. The key member 7 is housed in the inward circumferential groove 5 formed in the outer fitting tube portion 2 in a state of being retracted from the entrance to the back (FIG. 3A).
2. The second male threaded portion 16 of the bolt body 8 is screwed into the female threaded portion 18 formed on the key member 7 through the through hole 11 (FIG. 3 (a) → (b)).
3. While the male screw portion 12 of the nut 10 is screwed to the female screw portion 13 of the through hole 11, the female screw portion 19 of the nut 10 is simultaneously screwed to the first male screw portion 15 and hits the step portion 20 formed in the through hole 11. Install the nut 10 until In addition, the cross groove 21 for rotation operation is formed in the end surface part of the nut 10 (FIG.3 (c)).
4). The outer fitting tube portion 2 is fitted to the inner fitting column portion 3 (FIG. 3D).
5). The key body 7 is moved to a position across the outward circumferential groove 6 and the inward circumferential groove 5 by rotating the bolt body 8 clockwise (FIG. 3E).
6). The stopper 14 is locked in the through hole 11 to prevent the nut 10 from coming off (FIG. 3 (f)).

(The procedure for releasing the connection state between the outer fitting pipe portion 2 and the inner fitting column portion 3 will be described.) (FIGS. 4A to 4C and FIGS. 5D to 5F)
1. The stopper 14 is removed from the through hole 11 and taken out (FIG. 4A).
2. The nut 10 is reversely rotated and taken out from the female screw portion 13 of the through hole 11 (FIG. 4B).
3. A nipple 22 for connecting a water supply pipe is attached to the through hole 11, and cleaning water is introduced from the gap between the bolt body 8 and the through hole 11 through the water supply pipe, and is accumulated in the key member 7 and the inward circumferential groove 5. Wash out mud and sand (Fig. 4 (c)).
4). The nut 10 is screwed into the stepped portion 20 (FIG. 5D).
5). The bolt body 8 is rotated in the reverse direction, and the key member 7 is retracted to the back of the inward circumferential groove 5 (FIG. 5E).
6). The outer fitting tube portion 2 is separated from the inner fitting column portion 3 (FIG. 5F).

[Another embodiment]
Other embodiments will be described below.

<1> The key member 7 may be structured to be retracted and housed in the outer circumferential groove 6. In this case, when the outer fitting tube portion 2 and the inner fitting column portion 3 are connected, the bolt main body 8 is positioned at a position spanning the inner circumferential groove 5 and the outer circumferential groove 6 by the bolt body 8. It is necessary to pull back from the outside.
<2> As shown in FIG. 6, the outer peripheral portion of the nut 10 may not be provided with the male screw portion 12. In this case, the nut 10 is provided with a rotation prevention mechanism when the bolt body 8 is rotated. May be provided with a stopper 14 for preventing the through hole 11 from coming off. That is, the nut 10 is provided with a locking hole 24 formed with a female screw 23 on which the tool can be locked or a take-off bolt can be screwed, and the tool or the bolt is locked in the locking hole 24. It is used when the bolt body 8 is rotated while the rotation is stopped, or when the nut 10 is taken out from the through hole 11 by removing the stopper 14.
<3> As shown in FIG. 7, in the state where the nut 10 is fitted in the through hole 11, the insertion portion 25 that faces the key member 7 from the outside of the outer fitting tube portion 2 is connected to the nut 10 and the penetration. The nut 10 may be formed so as to be formed between the holes 11. In other words, the male screw portion 12 that can be screwed into the female screw portion 13 formed in the through hole 11 is provided only on the peripheral portions of the outer peripheral portion of the nut 10 facing each other, and the insertion portion 25 is provided on the outer peripheral portion other than the male screw portion 12. By forming the special nut 10 for forming the cleaning water, cleaning water can be supplied between the key member 7 and the inward circumferential groove 5 or the outward circumferential groove 6 through the insertion portion 25.
<4> In addition to the bolt main body 8 and the nut 10, the operation bolt A may be composed of only the bolt main body 8, as shown in FIG. The first male screw part 15 that is screwed into the female screw part 13 is formed on a part of the head of the bolt main body 8 and the insertion part 25 is formed between the bolt main body 8 and the through hole 11. The bolt body 8 is formed in a shape in which is formed.
<5> Further, similarly to the above, in order to form the insertion portion 25 in the bolt main body 8, as shown in FIG. 11, the female screw portion 13 is formed in the through hole 11 and screwed into the female screw portion 13. The male screw part 15 may be formed in the head of the bolt body 8, and a plurality of insertion holes 28 may be formed in the head of the bolt body 8, and the insertion part 25 may be configured by the insertion holes 28. . The insertion holes 28 are normally plugged, and the stoppers are removed during cleaning, and cleaning water is injected from the insertion holes 28.
<6> A flush water discharge path that has entered the inward circumferential groove 5 through the insertion portion 25 may be formed in at least one of the outer fitting pipe portion 2 and the inner fitting column portion 3. Good (not shown).
<7> The internal fitting column part 3 may be formed of a solid steel rod-like body in addition to the steel pipe.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

2 Tube part for external fitting 3 Column part for internal fitting 5 Inward circumferential groove 6 Outward circumferential groove 7 Key member 8 Bolt body 9 Bolt mounting part 10 Nut 11 Through hole 12 Male thread part 13 Female thread part 14 Stopper 25 Insertion part A Operation bolt

Claims (9)

At both ends, an outer fitting tube part and an inner fitting column part are provided separately,
An inward circumferential groove is formed on the inner peripheral side of the outer fitting tube portion, and an outer circumferential groove is formed on the outer peripheral side of the inner fitting column portion,
The outer fitting tube portion and the inner fitting column portion are configured to be fitted and connectable between different columnar bodies,
A key member that is mounted across the inward circumferential groove and the outward circumferential groove in a state in which the outer fitting pipe portion and the inner fitting column portion are fitted to each other;
The key member can be accommodated in a state where the key member is retracted from the entrance of the inward circumferential groove or the outward circumferential groove to the back
An operation bolt is provided for moving the key member from a state in which the key member is housed in the inner circumferential groove or the outer circumferential groove to a state between the inner circumferential groove and the outer circumferential groove. A plurality of columnar bodies provided on the pipe portion for external fitting, the bolt mounting portion for mounting the operation bolt to be operable from the outside of the pipe portion for external fitting, and the pipe portion for external fitting between adjacent ones A plurality of members in the connecting columnar body are formed after fitting the inner fitting column parts to each other and mounting the key member in a state extending between the inward circumferential groove and the outward circumferential groove. A method for separating connected columnar bodies that separates the columnar bodies,
The columnar body is provided with an insertion portion that allows the inward circumferential groove and the outside of the outer fitting tube portion to communicate with each other,
In a state where a plurality of the columnar bodies are fitted and connected to each other,
Injecting cleaning water into the inward circumferential groove through the insertion part, washing out the solid matter that has entered the inward circumferential groove or the outward circumferential groove with the cleaning water,
A method for separating a connected columnar body, wherein the operation bolt is operated in the bolt mounting portion to retract the key member to the back of the inward circumferential groove, and the adjacent columnar bodies are separated and separated.   The connecting columnar bodies are embedded in the ground after connecting the plurality of columnar bodies, and when separating the columnar bodies, the connecting columnar bodies are pulled out to fit and connect the columnar bodies. 2. The columnar body is separated by separating the adjacent columnar bodies from each other after the portion is brought out on the ground and then washed by injecting cleaning water into the inward circumferential groove through the insertion portion. Method for separating connected columnar bodies. At both ends, an outer fitting tube part and an inner fitting column part are provided separately,
An inward circumferential groove is formed on the inner peripheral side of the outer fitting tube portion, and an outer circumferential groove is formed on the outer peripheral side of the inner fitting column portion,
The outer fitting tube portion and the inner fitting column portion are configured to be fitted and connectable between different columnar bodies,
A key member that is mounted across the inward circumferential groove and the outward circumferential groove in a state in which the outer fitting pipe portion and the inner fitting column portion are fitted to each other;
The key member can be accommodated in a state where the key member is retracted from the entrance of the inward circumferential groove or the outward circumferential groove to the back
An operation bolt is provided for moving the key member from a state in which the key member is housed in the inner circumferential groove or the outer circumferential groove to a state between the inner circumferential groove and the outer circumferential groove. A bolt mounting portion for attaching an operation bolt so as to be operable from the outside of the outer fitting tube portion is a columnar body provided on the outer fitting tube portion,
A columnar body provided with an insertion portion that allows the operation bolt attached to the bolt mounting portion to communicate with the inward circumferential groove and the outside of the outer fitting tube portion. The operation bolt is composed of a bolt body and a nut screwed into the head of the bolt body,
Forming a through hole into which the nut is fitted, in the outer fitting pipe portion;
The nut is detachably held with respect to the through hole,
The columnar body according to claim 3, wherein the insertion portion can be formed by removing the nut from the through hole and the bolt body.   The columnar body according to claim 4, wherein a male screw part is formed on an outer peripheral part of the nut, and a female screw part into which the male screw part is screwed is formed in the through hole. The nut is fitted into the through-hole so as to be slidable in the axial direction, and a rotation-preventing mechanism is provided that makes it possible to prevent the nut from being fitted in the through-hole.
The columnar body according to claim 4, wherein a stopper for preventing the nut from coming off from the through hole is detachably provided in the through hole.   The nut is molded so that an insertion part that faces the key member from the outside of the outer fitting pipe part is formed between the nut and the through hole in a state in which the nut is fitted in the through hole. The columnar body according to any one of claims 4 to 6.   A through hole for fitting the head of the operation bolt is provided in the outer fitting tube portion, a male screw portion is provided in the head of the operation bolt, and a female screw portion into which the male screw portion is screwed is formed in the through hole. The columnar body according to claim 3, wherein the insertion portion is provided on a head of the operation bolt.   The discharge path for the cleaning water that has entered the inward circumferential groove through the insertion part is formed in at least one of the outer fitting pipe part or the inner fitting column part. The columnar body according to any one of the preceding claims.

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