JPH0732193A - Internal clamp for piping - Google Patents

Abstract

PURPOSE:To move a clamp in a stable state by moving one of two clamps connected by a joint to a butting position of piping as the clamps are connected. CONSTITUTION:Two clamps A and B are joined by a joint 17 and the clamps are inserted in pipings 51 and 52 as joined. The clamps are moved by a caster 15 and they are stopped when the seal rings 61 and 62 of expansion rings 31 to 33 of the clamp B are positioned at the butting part of pipings 51 and 52. Then compressed air, etc., is supplied to the clamp B, rubber tubes 91 and 92 are expanded and the expansion rings 31 to 31 are pressed. As a result, the seal rings 61 and 62 are abutted on the inner peripheral surfaces of pipings 51 and 52 to be brought into tight contact with them. Meanwhile, inert gas is supplied from an inert gas supplying tube 11 and the seal rings 61 and 62 are filled with the inert gas. In this state, the groove of butting part of the pipings 51 and 52 are welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal clamp for piping.

[0002]

2. Description of the Related Art In a conventional clamp of this type, a backing head, which is divided into a large number of pieces, is moved in and out by a cylinder to hold the inner surfaces of the abutting pipes and weld them from the outer circumference. Further, it was difficult to connect the two clamps into one line.

[0003]

By the way, in the clamp, the overall width is formed to be small so that the clamp can be easily moved and operated when it is inserted into the pipe. However, stable movement and insertion into the pipe were difficult.

Therefore, the present invention is intended to provide a clamp which can be stably moved by connecting two clamps.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a ring-shaped main body ring having a channel-shaped cross section, and a seal ring which abuts inside the butt portion of the pipe on both sides of the upper surface An internal clamp for piping is constructed by connecting both clamps that are fixed to each other into an expansion ring that can be moved in the radial direction, and connecting them with a coupler that is detachably attached to a support rod that supports the main body ring. To do.

[0006]

The present invention is constructed as described above, and after the two clamps are connected to each other by the coupler, one clamp is moved to the butting position of the pipes, and then the expansion rings at the butting positions. To the outer circumference,
Position the seal rings on both sides on both sides of the pipe butt joint and clamp. In this state, an inert gas is supplied into the seal ring to weld the outer circumference of the pipe.

[0007]

Embodiments of the present invention will be described in detail with reference to the drawings. In the present invention, two clamps A and B are combined and used, and each clamp A, B is configured as follows. That is, the inner surface of the main body ring 1 (see FIG. 3) having a channel-shaped cross section is supported by the cross-shaped hollow support rod 2. Then, the channel-shaped expansion rings 3 ₁ , 3 ₂ , 3 ₃ , preferably divided into three parts (see FIG. 2) are fitted to the inner surface of the outer periphery of the main body ring 1 so as to face each other. Each expansion ring 3 ₁ , 3 ₂ , 3
₃ is formed so as to surround the coil springs 4 ₁ and 4 ₂ on both sides of the outer circumference so as not to separate.

In addition, each expansion ring 3 ₁ , 3
Sealing rings 6 ₁ and 6 ₂ that are in contact with the inner surfaces of the pipes 5 ₁ and 5 ₂ at the abutting portion side are fixed to both sides of the central portion of ₂ 3 ₃ . A channel-shaped external joint member 7 (see FIG. 3) between the both seal rings 6 ₁ and 6 ₂ is arranged so that the open side faces the outer periphery, and one end portion of one surface of each expansion ring 3 ₁ , 3 ₂ , 3 ₃ It is fixed to and the free end is projected.
In addition, a channel type internal joint member 8 is fixed to the rear end portions of the expansion rings 3 ₁ , 3 ₂ , 3 ₃ so that the open side faces the inner circumference, and the free end is the joint member 7. It is projected to a position facing.

The expansion rings 3 ₁ , 3 ₂ , 3 _{3 of the other side} are fitted between the joint members 7 and 8, and when the minimum diameter is reached, the end faces of the expansion rings 3 ₁ , 3 ₂ , 3 ₃ project. When the expansion rings 3 ₁ , 3 ₂ , 3 ₃ are fitted together and reach the maximum diameter, the outer and inner joint members 7, 8
It is located between them and does not generate a gap.

On the other hand, inside the main body ring 1, rubber tubes 9 ₁ and 9 ₂ are respectively located on both sides so as to communicate with the pressure fluid supply pipes 10 ₁ and 10 ₂ which are partially fixed to the main body ring 1. ing. Further, an inert gas supply pipe 11 penetrating the main body ring ₁ is attached, and a supply port 12 is opened between both seal rings 6 ₁ , 6 ₂ of the expansion rings 3 ₁ , 3 ₂ , 3 ₃ . . In addition, 1 in the figure
Reference numeral 3 is an operating rod or rope for traveling. In FIG. 3, 14 ₁ and 14 ₂ are protectors which protect the rubber tubes 9 ₁ and 9 ₂ from entering between the main body ring 1 and the expansion rings 3 ₁ , 3 ₂ and 3 ₃ .

In addition, casters 15, 15 ... Are attached to four places on the upper and lower sides of the main body ring 1 in FIG. 1 so that they can run in the pipes 5 ₁ , 5 ₂ . Figure 3
16 is a plate for division.

The clamps A and B are constructed as described above, respectively, and both clamps A and B are connected by a coupling tool 17.
That is, the connector 17 fixes the attachment plates 19 and 19 'on both sides of the connecting rod 18, and attaches both attachment plates 19 and 19'.
To the supporting rods 2 and 2 each having a cross shape,
Fix it so that it can be removed freely with. Further, the number of clamps is not limited to two, but may be two or more. In addition, 21,2
1, ... are reinforcing ribs.

This embodiment is constructed as described above,
In the unused state, the ends of the expansion rings 3 ₁ , 3 ₂ , 3 ₃ are brought into abutment with each other due to the contracting force of the coil springs 4 ₁ , 4 ₂ and are in the minimum diameter state. In this state, the clamps A and B of this embodiment are connected to the coupling tool 17
, The pipes 5 ₁ , 5 ₂ are inserted into the pipes 5 ₁ , 5 ₂ from any direction, moved by the casters 15, 15, ...
₁ , 3, ₂ and 3 ₃ seal rings 6 ₁ and 6 ₂ are pipes 5 ₁ ,
5 stops moving when it is located in ₂ butt portion.

Then, the rubber tube 9 of the clamp B
_When pressure fluid such as compressed air is supplied to ₁ , 9 ₂ by the pressure fluid supply pipes 10 ₁ , 10 ₂ , the rubber tubes 9 ₁ , 9
₂ expands and each expansion ring 3 ₁ , 3 ₂ , 3
Press ₃ . By this action each expansion ring 3
₁ , 3 ₂ , 3 ₃ move to the outer peripheral side in the main body ring 1, and the free ends of the expansion rings 3 ₁ , 3 ₂ , 3 ₃ move between the outer and inner joint members 7, 8 and the distance between the ends is increased. When the seal rings 6 ₁ , 6 ₂ come into contact with the inner peripheral surfaces of the pipes 5 ₁ , 5 ₂ when there is a gap in the butted portion, move the seal rings 6 ₁ , 6 ₂ to move the expansion rings 3 ₁ , 3 The supply of compressed air is stopped while the seal rings 6 ₁ and 6 _{2 of 2} and 3 ₃ are in close contact with the inner peripheral surfaces of the pipes 5 ₁ and 5 ₂ , and this state is maintained.

On the other hand, from the inert gas supply pipe 11 to the supply port 1
When an inert gas is supplied via 2, the seal ring 6
_1, the inert gas is filled between 6 _2. Since the external joint member 7 is present at a location where the seal rings 6 ₁ and 6 ₂ are not present, gas leakage is prevented to a minimum.

In this state, welding is performed on the groove of the abutting portion of the pipes 5 ₁ and 5 ₂ . After welding is completed, it stops the supply of the inert gas, stopping the supply of pressure fluid to the rubber tube 9 _1, 9 _2, the coil spring 4 _1, 4 ₂ Each expansion ring contraction force 3 _1, 3 ₂ 3 ₃ shrinks while discharging the fluid from the rubber tubes 9 ₁ , 9 ₂ , and shrinks with the ends of the expansion rings 3 ₁ , 3 ₂ , 3 _{3 in contact} with each other. After that, it is moved to the next pipe butt portion.

When the elbows are present in the pipes 5 ₁ and 5 ₂ , the coupler 17 is removed and both clamps A and B are made independent so that the elbow portions can be moved.

[0018]

INDUSTRIAL APPLICABILITY The present invention is not limited to the above-mentioned construction, and the expansion ring may be moved in the radial direction without using the rubber tubes 9 ₁ and 9 ₂ and other means may be used. is there.

The present invention has the above-mentioned structure and operation, and since the two clamps are moved in a connected state, they can be moved in a stable state. Further, when the elbow portion is present in the pipe, the connector can be detached and used alone.

[0020]

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of an internal clamp for piping according to the present invention.

FIG. 2 is a front view.

FIG. 3 is an enlarged cross-sectional view of a main part.

FIG. 4 is a perspective view showing a joint member of a butted portion of the expansion ring.

[Explanation of symbols]

1 Main body ring 2 Support rod 3 ₁ Expansion ring 3 ₂ Expansion ring 3 ₃ Expansion ring 4 ₁ Coil spring 4 ₂ Coil spring 5 ₁ Piping 5 ₂ Piping 6 ₁ Seal ring 6 ₂ Seal ring 7 External joint member 8 Internal joint member 9 ₁ Rubber tube 9 ₂ Rubber tube 10 ₁ Pressure fluid supply pipe 10 ₂ Pressure fluid supply pipe 11 Inert gas supply pipe 12 Supply port 13 Operation rod or rope 14 ₁ Protector 14 ₂ Protector 15 Caster 16 Partition plate 17 Connector 18 Connection Rod 19 Mounting plate 19 'Mounting plate 20 Bolt 21 Reinforcing rib A clamp B clamp

Claims (1)

[Claims] 1. An expansion ring, which is divided into a plurality of parts, in which a seal ring is fixed on both sides of an upper surface in a ring-shaped main body ring having a channel-shaped cross section so as to abut against the inside of a butt portion of a pipe, and the expansion ring can be moved in a radial direction. An internal clamp for piping, characterized in that at least two clamps thus fitted are connected to each other by a coupling tool that is detachably attached to a support rod that supports the main body ring.