JP3521937B2 - Closure plug tightening tool - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closing plug tightening tool for screwing and tightening a lining closing plug having a resin-coated periphery on a lining saddle mounted on a gas supply pipe and having a resin-coated periphery.

[0002]

2. Description of the Related Art A bypass method has been conventionally used as a method for repairing gas leakage of a gas supply pipe buried in the ground or the like. In this bypass construction method, as shown in FIGS. 8 and 9, a temporary connection hose 2 is arranged so as to connect the upstream part A and the downstream part B of the repair part x in the gas supply pipe 1, and the temporary connection hose 2 is provided. The gas is supplied through the gas supply pipe 1, and the repair work is performed while closing the gas supply pipe 1 at two points closer to the repair point x than the branch point by the temporary connection hose 2 to prevent the gas from flowing out from the repair point x. It is something to do.

In this repair work, first, saddles 3 are attached to the upstream portion A and the downstream portion B of the repair location x in the gas supply pipe 1, and the punches 4, 4 are mounted on the saddle 3.
A unit 10 including a hose cock 5, a gas bag device 6, a shutter device 7, a branch portion 8, a water column gauge 9, and the like.
Is attached, and the temporary connection hose 2 is arranged between the joints 11 attached to the branch portions 8 of both units 10.

Thereafter, with the shutters 7a of both shutter devices 7 open, air is injected from one hose cock 5 and the pressure drop is measured by a water column gauge 9 attached to the other hose cock 5. Then, the airtightness test of the passage passing through the temporary connection hose 2 side between both units 10 is performed.

Then, the punching machine 4 punches the attachment position of the saddle 3 in the upstream gas supply pipe 1. That is, FIG.
As shown in FIG. 5, the drilling shaft 12 having the hole saw 15 attached to the lower end is lowered toward the drilling site to
After an electric motor (not shown) is attached to the upper end of the unit to carry out the punching work, the shutter 7a at this location is closed and the drilling shaft 12 is removed from the casing 10a of the unit 10.
After this, a magnet shaft (not shown) is appropriately inserted to remove chips. Similarly, the punching machine 4 punches the attachment location of the saddle 3 in the gas supply pipe 1 on the downstream side, and closes the shutter 7a at this location.

The shutter 7 of the shutter device 7
a is sequentially opened to allow the gas to pass not only through the gas supply pipe 1 but also through the temporary connection hose 2. After this, the gas bag 6a is inserted in a contracted state from the bored hole to the side of the gas supply pipe 1 closer to the repair location x, and the gas bag 6a is inflated to shut off the upstream side of the repair location x, and in the same manner. The downstream side of the repaired part x is also shut off, and gas is allowed to pass only through the temporary connection hose 2 side. At this time, the gas supply pressure is monitored by the water column gauge 9 attached to the unit 10 at the downstream location B.

When the repair work of the repaired portion x is completed, the gas bag 6a is contracted and pulled out from the perforation hole, the shutter 7a is sequentially closed, and the bypass passage by the temporary connection hose 2 is closed to restore the original state. Gas is supplied only by the gas supply pipe 1.

Finally, the closing plug fastening 14 assembled with the metallic closing plug 13 is installed in the casing 1 of the unit 10.
0a, the shutter 7a is opened, and the hole of the saddle 3 is closed by the metal closing plug 13.

The metal closing plug 13 includes a male screw portion 13a screwed into the female screw portion 3a on the wall surface of the hole of the saddle 3, and an engaging recess 14 provided at a lower portion of the closing plug tightening tool 14.
It is composed of an engaging convex portion 13b that is square in plan view and that engages with a. Further, the closing plug tightening tool 14 includes a flange portion 14b that is detachably attached to an upper surface portion of the casing 10a and closes the upper surface opening, and a rotating shaft with a handle that can be raised and lowered in a state of being in close contact with the flange portion 14b. 14c, and a mounting body 14d formed at the lower end of the rotating shaft 14c and having an engaging recess 14a formed therein. A magnet 14e is provided inside the mounting body 14d above the engaging recess 14a. Then, the shutter 7a is closed and the mounting body 14d
With the metal closing plug 13 magnetically attached by the magnet 14e, the closing plug tightening tool 14 is attached to the casing 10a to prevent gas from leaking to the outside, the shutter 7a is opened, and the transparent inspection of the casing 10a is performed. The rotating shaft 1 of the closing plug tightening tool 14 while observing the state from the window 10c.
The temporary closing work was performed by rotating the metal closing plug 13 by holding the handle 4c and screwing it into the female screw portion 3a of the saddle 3.

By the way, the conventional gas supply pipe 1 made of a steel pipe or cast iron pipe is coated on its outer peripheral surface so as to suppress the generation of rust. However, as shown in FIG. A lining pipe 20 is used as a gas supply pipe, which is configured by covering the periphery of the pipe with a resin 20a or the like so that the metal portion 20b is not exposed at the outer peripheral portion and further preventing the generation of rust on the outer peripheral portion. In response to this, the lining saddle 21 whose outer peripheral portion is covered with the resin 21a and the lining closing plug 22 whose outer peripheral portion is similarly covered with the resin 22a have been put into practical use.

As shown in FIG. 11, the lining closure plug 22 has a male screw portion 22b screwed into the female screw portion 21a of the lining saddle 21, a sealing member 22c disposed above the male screw portion 22b, and a resin surrounding portion. Stepped cylindrical body (small diameter portion 22d and large diameter portion 22e) covered with
Consists of. When the lining closing plug 22 is screwed into the lining saddle 21, the sealing member 22c
Is brought into close contact with the sleeve portion 21c made of resin and extending above the female thread portion 21a of the lining saddle 21, and the lining saddle 21 and the lining closing plug 2
It is designed to prevent water from entering through the joint with 2.

[0012]

However, according to the closure plug tightening tool 14 of the above-mentioned conventional structure, the lining closure plug 22 has the small diameter portion 22d and the large diameter portion 22e, which are main bodies, covered with resin. Therefore, the lining closing plug 22 cannot be magnetically attached by a magnet or the like. Therefore, there is a problem that what kind of structure can hold the lining closing plug 22 satisfactorily and perform the tightening work on the lining saddle 21.

The present invention solves the above problems, and an object of the present invention is to provide a tool for tightening a closing plug, which can hold the lining closing plug well and can surely screw in the lining saddle. To do.

[0014]

In order to solve the above problems, the first means of the present invention is to provide a rotary shaft that penetrates into a casing assembled above a lining saddle and is arranged so as to be retractable. A plurality of holding arms attached to the end of the rotating shaft for holding the plug body of the lining closing plug from the outer peripheral side, and a locking mechanism for engaging and disengaging the rotating shaft side and the holding arm side. It is a thing.

A second means of the present invention is the same as the first means, wherein the rotary shaft is detachably attached to the member to which the holding arm is attached, and the metallic saddle is made of metal for closing the saddle. It is also configured to be detachable with respect to a member having an engaging portion that engages with the closing plug.

[0016]

In the first means, the lining closing plug is clamped from the outer peripheral side by the clamping arm, and the rotating shaft is rotated by the locking mechanism in a state where the rotating shaft side and the clamping arm side are engaged with each other, thereby lining the closing plug. After performing the temporary tightening of
The locking mechanism separates the rotating shaft side and the clamping arm side,
Finally, remove the casing and tighten it completely. As a result, the screwing operation of the lining closing plug can be performed reliably and efficiently.

Further, in the second means, by attaching the member having the holding arm attached to the rotary shaft or the member having the engaging portion for engaging with the metallic closing plug, not only the lining closing plug but also the It is possible to screw in a metal closure plug.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. It should be noted that those having the same functions as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, the closing plug tightening tool 30 is detachably attached to the upper surface portion of the casing 10a assembled above the lining saddle 21 and is a collar portion 31 assembled as a lid for closing the upper surface opening portion. And a rotating shaft 32 with a handle that penetrates the center of the flange 31 in a close contact state so as to move up and down, and a screw 3 at the lower end of the rotating shaft 32.
3, a disk-shaped plug wrench 34 fixed via the plug wrench 3, two projections 35 (see FIG. 2) projecting downward from the plug wrench 34, and a plug wrench 34 via the projection 35. The chuck body 36 that can be engaged and disengaged with the chuck body 36, and three holding arms 37 that integrally extend from the lower surface of the chuck body 36 and hold the small diameter portion 22d (see FIG. 4) of the lining closing plug 22 from the outer peripheral side. It has and.
The plug wrench 34, the protrusion 35, and the chuck body 36 constitute a locking mechanism that engages and disengages the rotating shaft 32 side and the holding arm 37 side.

Here, as shown in FIGS. 2A to 2C, in the plug wrench 34, a part of the connecting shaft 34a projecting upward is cut out in a flat shape, and the rotating shaft 3 is formed in the cutout surface 34b.
The plug wrench 34 can be integrally fixed to the rotary shaft 32 by abutting the screw 33 which is screwed on the side 2 from the side. Further, the plug wrench 34 is integrally formed with a projecting columnar portion 34c projecting downward, and the projecting columnar portion 34c is insertable into a guide hole 36a formed in the chuck body 36, so that the plug wrench 34 is detached. The chuck body 36 can be easily positioned.

Further, as shown in FIGS. 3A to 3C and FIG. 4, the chuck body 36 is formed with two elongated holes 36b into which the protrusions 35 of the plug wrench 34 are fitted. Only the central portion 36c of 36b is the head portion 35a of the protrusion 35.
Is widened for insertion. Further, the lower portion of the elongated hole 36b of the chuck body 36 is an expanded hole portion 36 that is widened so that the head portion 35a of the protrusion 35 can freely move.
d. Also, the holding arm 3 of the chuck body 36
A tooth portion 37 a that extends vertically is formed on the inner peripheral side of 7, and has a shape that easily bites into the outer peripheral surface of the small diameter portion 22 d of the lining closing plug 22. As shown in FIG. 5, the small-diameter portion 22d of the lining closing plug 22 is tapered so that it becomes slightly thicker toward the large-diameter portion 22e.

Further, as shown in FIG. 6, the lower end of the rotary shaft 32 is also attachable / detachable to / from a mounting body 38 via a screw 33. An engaging recess 38a that engages with the engaging protrusion 13b of the metallic closing plug 13 is formed in the mounting body 38, and a magnet that magnetically attaches the engaging protrusion 13b of the metallic closing plug 13 is formed. 39 is installed in the upper part of the engagement recess 38a.

In the above structure, after the repair work of the repaired portion x is performed, the shutter 7a is sequentially closed and the gas is supplied only by the lining pipe 20, the temporary tightening work of the lining closing plug 22 is performed as follows. Do it.

First, as shown in FIG. 5, the chuck body 36 is strongly pressed from above the small-diameter portion 22d of the lining closing plug 22 placed in advance to be externally fitted to the chuck body 36.
The lining closing plug 22 is securely held by the holding arm 37 of FIG. Then, a plug wrench 34 attached to the lower end of the rotary shaft 32 is connected and assembled to the chuck body 36 that holds the lining closing plug 22. That is, as shown in FIG. 7A, after the protrusion 35 of the plug wrench 34 is fitted into the central portion 36c of the elongated hole 36b of the chuck body 36, the protrusion 35 is moved to a position shown in FIG. 7B in a predetermined direction. The chuck body 36 rotates to the plug wrench 34
Do not fall from After that, the collar portion 31 of the closing plug fastening tool 30 is mounted on the upper surface of the casing 10a, and the lower portion of the closing plug fastening tool 30 holding the lining closing plug 22 is placed inside the casing 10a to be externally mounted. Make sure that gas cannot leak.

Next, the shutter 7a is opened, and the lining closing plug 22 is rotated by holding the handle of the rotary shaft 32 of the closing plug fastening tool 30 while observing the state through the transparent peep window 10c of the casing 10a. 21 is screwed into the female screw portion 21a for temporary tightening work.

After that, the handle of the rotary shaft 32 of the closing plug tightening tool 30 is held, and the plug wrench 34 is slightly rotated with respect to the chuck body 36 in a direction opposite to the screw-in direction, so that the chuck body 36 is rotated. The protrusion 35 of the plug wrench 34 is located at the central portion 36c of the long hole 36b (see FIG. 7).
(See (a)). In this state, the rotary shaft 32 is raised to separate the plug wrench 34 from the chuck body 36. Then, after removing the unit 10 from the lining saddle 21, the lining closing plug 22 is fully tightened using a predetermined jig. As a result, the lining closing plug 22 can be surely screwed into the lining saddle 21, and the rotary shaft 32 can be easily removed from the chuck body 36 holding the lining closing plug 22, and the chuck body can be closed via the rotary shaft. Since it is not necessary to perform a troublesome work such as separating from the plug, the work can be performed efficiently.

When the metal closing plug 13 is screwed into the metal saddle 3, the closing plug tightening tool 30 is used.
In place of the plug wrench 34, the mounting body 38
With the screw 33, the screwing operation can be performed while the metal closing plug 13 is magnetically attached by the attaching body 38 as in the conventional case.

As a result, this closing plug tightening tool 3
With 0, not only the lining closing plug 22 but also the metal closing plug 13 can be screwed.

[0029]

As described above, according to the present invention, a rotary shaft that is arranged so as to extend and retract so as to penetrate into the casing assembled above the lining saddle, and is attached to the end of the rotary shaft. Since a plurality of holding arms for holding the plug main body of the lining closing plug from the outer peripheral side and a locking mechanism for engaging and disengaging the rotating shaft side and the holding arm side are provided, screwing work of the lining closing plug can be performed. It can be done reliably and efficiently.

Further, the rotary shaft is configured to be detachable from the member to which the holding arm is attached, and to the member having the engaging portion for engaging with the metal closing plug for closing the metal saddle. By making it detachable,
Not only lining closure plugs, but also metal closure plugs can be screwed in.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a unit in which a closing plug fastening tool according to an embodiment of the present invention is used.

2A to 2C are a front view, a plan view and a bottom view of a plug wrench of the closing plug tightening tool.

3 (a) to (c) are a front view, a plan view and a bottom view of a chuck body of the closing plug fastening tool.

FIG. 4 is a partially cutaway front view of the same closing plug fastening tool assembled to the lining closing plug.

FIG. 5 is a partially cutaway front view when the chuck body of the closing plug fastening tool is assembled to the lining closing plug.

FIG. 6 is a partially cutaway front view of the unit when the metal closing plug is assembled by the closing plug fastening tool.

7 (a) and 7 (b) are plan sectional views for explaining a locking mechanism according to an embodiment of the present invention.

FIG. 8 is a front view for explaining the bypass method.

FIG. 9 is a partially cutaway front view of the unit at the time of punching work.

FIG. 10 is a partially cutaway front view of a unit when a metal closing plug is assembled with a conventional closing plug tightening tool.

FIG. 11 is a side sectional view when the lining closing plug is assembled to the lining saddle.

[Explanation of symbols]

1 gas supply pipe 3 saddle 3a Female screw part 13 Metal closure plug 13a male screw part 13b engaging protrusion 10a casing 20 lining pipe (gas supply pipe) 21 Lining Saddle 22 Lining closure plug 22a resin 22b Male thread 22d Small diameter part (plug body) 30 Closing plug tightening tool 31 collar part 32 rotation axis 33 screws 34 plug wrench 34a connecting shaft 34b Notch surface 34c Protruding column 35 Protrusion 35a head 36 chuck body 36a guide hole 36b long hole 36c central part 36d Expansion hole 37 Clipping arm 38 Mounting body 38a engagement recess 39 magnets

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junji Ishikawa 4-1-2 Hirano-cho, Chuo-ku, Osaka City Osaka Osaka Gas Co., Ltd. (72) Inventor Mikio Nakaoka 2--10-16 Minamikagaya, Suminoe-ku, Osaka No. Shinwa Sangyo Co., Ltd. (56) Reference JP-A-63-297895 (JP, A) JP-A-58-46288 (JP, A) Actually open 2-24195 (JP, U) Actually open 60- 99388 (JP, U) Actual flat 2-59394 (JP, U) Actual flat 4-95192 (JP, U) Actual 52-131611 (JP, U) Actual flat 3-119413 (JP, U) Furukai Hira 2-62196 (JP, U) Furukai Sho 61-173891 (JP, U) Fukui Sho 35-27789 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 41/00-49/00

Claims (2)

(57) [Claims] 1. A closing plug tightening tool for screwing and tightening a lining closing plug, the circumference of which is covered with a resin, to a lining saddle which is attached to a gas supply pipe and whose circumference is covered with a resin, and which is provided above the lining saddle. A rotary shaft penetrating into the casing to be installed in such a manner that it can be retracted and retracted, and a plurality of clamping arms that are attached to the end of this rotary shaft and clamp the plug body of the lining closing plug from the outer peripheral side, A closing plug tightening tool including a locking mechanism for engaging and disengaging the rotating shaft side and the holding arm side. 2. A rotating shaft is configured to be detachable with respect to a member to which a holding arm is attached, and to a member having an engaging portion that engages with a metal closing plug for closing a metal saddle. The closing plug tightening tool according to claim 1, wherein the closing plug is also removable.