JPH0749194Y2 - Fitting mounting jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fitting mounting jig used when mounting a fitting on a main pipe in a hot tap method.

[Prior Art] The hot tap method has been conventionally used in gas and water works. This is a construction method for repairing a scratch generated in the main pipe while keeping the fluid flowing in the main pipe without lowering the fluid pressure in the main pipe. The outline of the conventional hot tap method will be described below with reference to FIGS. 12 to 20.

Figure 12 shows the damaged main pipe with fittings on both sides of the damage.
FIG. 14 is a configuration diagram of the fitting and a detailed view of the mounting state.

As shown in FIG. 12, when damage 101 occurs in a part of the main pipe 100 due to external construction or the like, fittings 10 are attached to both sides of the damage 101 by welding. This fitting 10
As shown in FIG. 13, the upper fitting 11 is divided into upper and lower parts, the lower fitting 12, and the neck fitting 13 integrated by the butt welding 21 on the upper fitting 11 and the neck fitting 13. It is composed of a seal plug 14 which is screwed. Neck fitting 13 is a flange with bolt mounting holes 15.
Have 16.

To attach the fitting 10 above to the main 100,
As shown in Fig. 14, first, the upper and lower fittings 1
1 and 12 are attached to the main pipe 100 by fillet welding 22, respectively, and then both fittings 11 and 12 are joined by butt welding 23.
Finally, the seal plug 14 is screwed to the neck fitting 13. In this way, the inside of the fitting 10 is sealed, and the attachment with the main pipe 100 is completed.

Next, FIG. 15 is an explanatory view of the main pipe perforating work after the fitting 10 is attached. That is, the gate valve 102 and the punching machine 103 are sequentially flange-connected and set on the neck fitting 13. Although not shown in the figure,
Remove the seal plug 14 before setting the gate valve 102 and the like.

The drilling machine 103 includes a center drill 104 and a cylindrical cutter 105 coaxial with the center drill 104, and the drill 104 and the cutter 105 are rotated by an external drive source (for example, an engine). The perforator 103 has a closed structure, and the drill 104 and the cutter 105 are rotated so that the through hole 1 is formed in the main pipe 100.
06 is formed.

After perforating the main pipe 100, the gate valve 102 is closed and hermetically closed, and the perforator 103 is removed. After that, instead of the punching machine 103, a stopping machine 107 is attached as shown in FIG. 16, and the gate valve 102 is opened again to stop the stopping machine 1.
The stopper 108 is inserted into the through hole 106 of the main pipe 100 by 07.

Here, the stopper 108 has a structure in which a rubber plate 111 is attached to the surface of a cylindrical body 110 having a slit 109 as shown in FIG. And, this stopper 108,
As shown in FIG. 18, the slit 109 is formed in the fluid flow direction a.
To the through hole 106, and by operating the stopping machine 107, the cylindrical body 110 is expanded in the radial direction and the rubber plate 111 is inserted into the through hole.
Closely attach to 106.

The above-mentioned perforation and stopper insertion are performed for each fitting, and finally the bypass pipes 113 are provided between the bypass attachment ports 112 provided in both stopping machines 107 as shown in FIG.
Connection, the fluid in the main pipe 100 flows through the bypass pipe 113 as shown by the arrow. On the other hand, the damaged part of the main 100
The fluid in tube 101 stops flowing.

After that, the fluid inside the pipe at the damaged portion is removed, a new pipe is replaced and repaired, and then the work reverse to the above process is performed. That is, the stopper 108 is contracted and removed, the gate valve 102 is closed, and then the bypass pipe 113 and the stopping machine 107 are removed. Then, a plug tightener (not shown) equipped with the sealing plug 14 is mounted on the gate valve 102, the gate valve 102 is opened, and the sealing plug 14 is screwed to the neck fitting 13. The seal plug 14 has a 20th
As shown in the figure, an O-ring 17 is provided.
17 closely contacts a sealing surface 18 provided at the female screw inlet of the neck fitting 13 to seal the internal fluid. This completes the repair work.

The main pipe 100 to which the above-mentioned hot tap method is applied is generally a buried pipe, and therefore, installing the fitting 10 on the main pipe 100 involves raising and lowering the fitting 10 and moving it laterally. However, if the diameter of the main pipe 100 is large, the weight of the fitting itself becomes heavy, for example, 300 A
In the main pipe, the upper fitting weighs about 70 kg and the lower fitting weighs about 80 kg, and a great deal of labor is required to install the fitting 10. In particular, the lower fitting 12 has to be brought closer to the main pipe 100 from the lower side of the main pipe 100, and it is difficult to reduce the labor.
-172094 uses a mounting jig as shown.

In this mounting jig, as shown in FIGS. 21 and 22, the jig main body 120 is adapted to be hung from the lateral direction of the main pipe 100 by the saddle-shaped holding portion 121 on the upper side. In the lower part of the jig body 120, a pedestal 122 on which the lower fitting 12 is placed is provided, and the pedestal 122 is lifted by the jack 123 to lift the lower fitting 12, so that the lower fitting 12 can be installed at the bottom of the main pipe 100. ing. On the other hand, the upper fitting 11 is installed on the upper portion of the main pipe 100 between the left and right saddle-shaped holding portions 121, and is aligned with the lower fitting 12 and then welded.

[Problems to be Solved by the Invention] However, in the above-described conventional mounting jig, when setting the lower fitting 12 on the jig, first, the lower fitting 12 is excavated from the ground surface by a wrecker or the like 115.
It is necessary to lower it once (Fig. 12) and then place it on the pedestal 122 of the jig body 120 already set on the main pipe 100. Also, since the lower fitting 12 has a rounded shape, it is difficult to hold the human hand when placing or moving it, and it is particularly dangerous and dangerous when it is slippery in the rain. It was a thing.

An object of the present invention is to provide a mounting jig capable of easily mounting the fitting to the main pipe by reducing or eliminating the labor and risk at the time of the conventional fitting mounting work as described above.

[Means for Solving the Problems] In order to achieve the above object, a fitting mounting jig according to the present invention is a jig for mounting a fitting on a main pipe in a hot tap method, and is provided on both sides of the main pipe. A plurality of support arms arranged to face each other, an arc support provided at one end of the support arm and coupled so as to surround the outer circumference of the main pipe, and to roll on the outer circumference of the main pipe. A rotatable first support member horizontally supported with both ends axially supported between the rolling element with a brake disposed on the circular arc support portion and the plurality of support arms disposed on one side of the main pipe. A support device for upper fitting, which is attached to the central portion of the first support member via a screw rod, and both ends of the support arm arranged on the other side of the main pipe. Second support that can be rotated horizontally A holding member and a lower fitting support device mounted on the second support member via a jack device are provided.

[Operation] By circularly connecting the circular arc supporting portions provided at one end of the plurality of supporting arms with each other, the circular arc supporting portions have a ring shape and surround the main pipe. Since the rolling element with a brake is arranged inside the circular arc supporting portion, the supporting arm is supported on the outer periphery of the main pipe and can be rotated around it.

On the other hand, on each side of the main pipe, the plurality of support arms are connected by the first and second support members whose both ends are rotatably supported, so that the central portion of the first support member is screwed. If the upper fitting is attached to the supporting device attached via the rod, and the lower fitting is attached to the supporting device attached via the jack device on the second supporting member, the upper fitting and the lower fitting are intermediate to each other. As a supporting member, it is supported in a balance state by supporting arms on both sides. Then, the mounting jig is rotated around the main pipe as described above, and when it is oriented in the vertical direction, the brake of the rolling element is applied and fixed, and then the screw rod and the jack device of each supporting device are fixed. By operation, the upper fitting can be installed on the upper part of the main pipe and the lower fitting can be installed on the lower part. Therefore,
The upper and lower fittings can be attached to the attachment jig according to the present invention, and the attachment jig can be hung by a crane or the like and carried into the main cutting site.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a mounting jig according to the present invention set on a main pipe, and FIG. 2 is a side view thereof.

This attachment jig 30 is roughly divided and arranged on both sides of the main pipe 100 so as to face each other, and a first support arm portion 31 for supporting the upper fitting 11 and a second support arm portion 32 for supporting the lower fitting 12 are provided. It consists of and.

The first support arm portion 31 has two support arms 34 each having an arcuate support portion 33 at one end, and the other ends of these support arms 34 rotatably supported by bolts 35 at both ends.
It is composed of a first supporting member 36 which is laterally bridged between 34 and 34, and a supporting device 38 for the upper fitting 11 which is attached to the central portion of the supporting member 36 via a screw rod 37.
Further, inside the arcuate support portion 33, an appropriate number of rolling elements 39 with a brake, such as casters, that can roll on the outer circumference of the main pipe 100 are arranged. The upper fitting 11 is attached to the mounting plate 40 of the supporting device 38 with a bolt by the neck fitting.
It is designed to attach 13 flanges 15. Screw rod
A handle 41 for rotating this is attached to one end of 37.

Next, the second support arm portion 32 has an arc support portion 42 at one end.
With two support arms 43, and these support arms 43
A second support member 45, which is rotatably supported by bolts 44 at the other end, is laid between the support arms 43, 43, and is mounted on the support member 45 via a jack device 46. And a support device 47 for the lower fitting 12.

Further, the circular arc support portion 42 is connected to the corresponding circular arc support portion 33 so as to surround the outer circumference of the main pipe 100 by both ends of the arc support portion 33 with pins 48, and an appropriate number of brake-equipped rolling elements 39 are similarly arranged inside thereof. ing. The second support member 45 is formed by a concave frame 49, and both ends thereof are pivotally supported by bolts 44 at the other end of each support arm 43. Further, a fitting receiver 50 for stably receiving the lower fitting 12 is installed in the frame 49, and a fitting receiver 50 is provided on the jack device 46.
A support 51 for the lower fitting 12 is configured by providing a pedestal 51 that supports a convex portion of the lower fitting 12 that protrudes downward from 50.

FIGS. 3 and 4 are external views of the support arm 34 and the support arm 43, respectively. At both ends of the arcuate support portions 33, 42 formed integrally with the support arms 34, 43, there are coupling pins. Mounting holes 52 for 48 and mounting holes 53 for bolts 35, 44 at the arm end
Are provided respectively. Although the brake of the rolling element 39 is not shown, it is preferable to use a commercially available caster with a stopper.

FIG. 5 (a) is an external view showing a portion of the upper fitting support device 38. A screw rod 37 is threaded through the center of a mounting plate 40 having a plurality of bolt mounting holes 54, and its tip is shown in FIG. It is rotatably attached with bolts 55 as shown in b). 56 are screw holes provided at both ends of the mounting plate 40.

FIG. 6 is an external view showing a portion of the lower fitting support device 47, and the fitting receiver 50 is composed of a housing frame 59 having a recess 58 for supporting the outer periphery of the main fitting port of the lower fitting 12. The pedestal 51 supports the rounded convex portion of the lower fitting 12 projecting downward of the housing frame 59, and is lifted by the jack device 46. Reference numeral 60 denotes screw holes provided at both upper ends of the frame 49.

Next, a method of using the mounting jig 30 configured as above will be described.

First, in a factory or a flat place on the ground, as shown in FIG. 7, the first and second support arm portions 31 and 32 are horizontally opposed to each other, and at least the upper ends of both arc support portions 33 and 42 are pinned. 48 and connect the upper fitting 11 to the mounting plate 40 of one of the supporting devices 38 and the flange 16 of the neck fitting 13
Secure with bolts 60 through the other support device
Place the lower fitting 12 in the fitting receiver 50 of 47.

Next, as shown in FIG. 8, when this mounting jig 30 is hung with a wire 61 and suspended with a crane 62 or the like, the first and second support arm portions 31 and 32 center on the coupling pin 48 at one end. When bent, the first support arm 34 and the second support arm 43 become parallel to each other in the vertical direction, and the first support member 36 and the second support member 45 respectively have bolts 35, It rotates about 44 and faces in the same direction, the opening of the upper fitting 11 faces downward, and the opening of the lower fitting 12 faces upward. In this state, the main pipe 100 is carried into the open / cut portion 115 (Fig. 8).

Then, as shown in FIG. 9, the arcuate support portions 33 and 42 are closed so as to surround the outer circumference of the main pipe 100, and the open end thereof is pin 48.
Are joined together to bring all the rolling elements 39 into contact with the outer circumference of the main pipe 100. As a result, the mounting jig 30 is supported in the balance state by using the main pipe 100 as an intermediate supporting member, and the wire hook of the crane is removed from the mounting jig 30.

From this state, as shown in FIG. 10, the mounting jig 30 is rotated so that the upper fitting 11 is located above the main pipe 100.
The mounting jig 30 is mounted on the outer circumference of the main pipe 100 and has a rolling element 39 with a brake.
Since it is supported by the main body 100, it can rotate around the main pipe 100.
Then, brake the rolling element 39 at the vertical position,
When the mounting jig 30 is fixed, the opening of the upper fitting 11 faces downward with the main pipe 100 in between, and the lower fitting.
The 12 openings are facing upward.

After that, the screw rod 37 of the support device 38 is rotated by the handle 41 and lowered, and the upper fitting 11 is installed on the upper part of the main pipe 100, while the jack device 46 of the support device 47 is raised and the pedestal is installed.
The lower fitting 12 is pushed up by 51 to install the lower fitting 12 in the lower part of the main pipe 100 (Fig. 11). Both fittings 11 and 12 are aligned and temporarily welded, and then the mounting jig 30 is removed. Then, both fittings 11 and 12 are main-welded and attached to the main pipe 100.

[Effects of the Invention] As described above, according to the present invention, the fitting can be carried into the main cutting site with the fitting set on the fitting and attached to the main, so the fitting installation work is safe and easy. Can be done. Further, since the supporting arm is rotatably supported on the outer circumference of the main pipe via the rolling element with a brake by the arcuate portions facing each other that are coupled so as to surround the outer circumference of the main pipe, the upper and lower fittings are attached. The effect that can be installed in the main at one time.

[Brief description of drawings]

FIG. 1 is a front view of a mounting jig showing an embodiment of the present invention, FIG. 2 is a side view of the same, FIGS. 3 and 4 are external views of first and second support arms, respectively. FIG. 6A is an external view of a supporting device for upper fitting, FIG. 6B is a sectional view showing a connecting state of a screw rod and a mounting plate of the supporting device, and FIG. 6 is an external view of a supporting device for lower fitting. Figures, Figures 7-
FIG. 11 is an explanatory view showing how to use the mounting jig of the present invention. FIG. 7 is a front view showing a state in which upper and lower fittings are set on the mounting jig, and FIG. 8 is a transportation of the mounting jig. Front view showing the time, FIG. 9 is a front view showing the time when the main pipe of the main mounting jig is set, and FIGS. 10 (a) and 10 (b) are front views showing the state of the upper and lower fittings just before the main pipe is installed. And side view,
11 (a) and 11 (b) are a front view and a side view showing a state where the upper and lower fittings are installed in the main pipe. 12 to 20 are explanatory views of the conventional hot tap method, and FIG. 12 is an explanatory view of a state in which a fitting is attached to the main pipe,
FIGS. 13 and 14 are a configuration diagram and a mounting state diagram of the fitting, FIG. 15 is an explanatory diagram when piercing the main pipe, FIG. 16 is an explanatory diagram when inserting a stopper into the main pipe, and FIG. Is an external view of the stopper, FIG. 18 is an explanatory view showing a state where the stopper is inserted in the main pipe, FIG. 19 is an explanatory view showing a state where the bypass pipe is attached to the main pipe, and FIG. 20 is a neck fitting. It is a detailed view showing a screw connection state with a seal plug. FIG. 21 is an external view of a conventional mounting jig, and FIG. 22 is a side view of the same. 10 …… Fitting 11 …… Upper fitting 12 …… Lower fitting 30 …… Mounting jig 31 …… First support arm part 32 …… Second support arm part 33 …… Arc support part 34 …… First Support arm 36 …… First support member 37 …… Screw rod 38 …… Support device for upper fitting 39 …… Roller with brake 42 …… Arc support 43 …… Second support arm 45 …… Second Support member 46 …… Jack device 47 …… Lower fitting support device 100 …… Main pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Unemoto 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Yuuo Ooka 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Tube Co., Ltd. (72) Inventor Osamu Arata 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Tube Co., Ltd. (72) Inventor Masami Ishikawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Inside Steel Pipe Co., Ltd. (72) Akira Sasaki, 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A jig for attaching a fitting to a main pipe in a hot tap method, comprising: a plurality of support arms arranged on opposite sides of the main pipe so as to face each other; A circular arc support portion coupled so as to surround the outer circumference of the pipe, a rolling element with a brake arranged on the circular arc support portion so as to roll on the outer circumference of the main pipe, and one side of the main pipe. A rotatable first support member having both ends axially supported between the plurality of support arms arranged therein, and an upper fitting attached to the central portion of the first support member via a screw rod. A supporting device, a rotatable second supporting member horizontally supported with both ends axially supported between the plurality of supporting arms arranged on the other side of the main pipe, and a jack device on the second supporting member. Lower fitting attached via A fitting mounting jig, which is provided with a supporting device.