JPS606708Y2 - pipe joining equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to a pipe joining device for pipe fittings for medium- and large-diameter pipes that allow a person to enter and work inside the pipe.

As shown in FIG. 1, there are pipe joints such as slip-on joints and roll-on joints in which a socket 3 of a pipe to be connected is inserted into a socket 2 of the pipe fitted with a rubber ring 1 as a backing material.

Conventionally, to join pipes in this type of pipe joint, for example, a wire rope is tied around the outer periphery of the pipe to be connected to an existing pipe, and a hydraulic ram or a hydraulic ram or It has been common practice to perform the joining operation from outside the pipe by hanging a tensioning means such as a lever block.

However, such a joining operation from outside the tube is difficult and time-consuming because the outer peripheral surface of the tube is circular and slippery.
In particular, the larger the diameter of the pipe, the worse the workability, and in some cases it may be necessary to work on slippery pipes.
The risks were also great.

In view of the above, the present invention is a pipe joining device designed to allow pipe joining operations to be carried out safely from inside the pipe, as well as to be easy to handle with a relatively simple structure and to be applicable to general pipes. The two abutment members having anti-slip means on the surfaces facing the inner surface of the pipe are pivotable at both ends of the support connecting rod about an axis perpendicular to the extending direction of the connecting rod. and a tensioning means is connected to an appropriate position near one end side from the center of the supporting connecting rod, and as the tensioning force increases, the adhesion force of the contact member, that is, the instrument to the inner surface of the tube increases as the tensioning force increases. It is characterized by the following.

Next, embodiments of the present invention will be described based on the drawings.

Reference numerals 4a and 4b are members for contacting the inner surface of the tube, and anti-slip means 5a and 5b made of rubber or the like are installed on the surface in contact with the inner surface of the tube by adhesive or other means, and usually this anti-slip means 5a , 5b is formed in a curved shape approximately corresponding to the inner periphery of the pipe according to the diameter of the pipe to be used, so that it can be pressed against the pipe inner surface almost uniformly over the entire surface. provided.

The surface of the anti-slip means 5a*5b may be formed with fine irregularities (not shown) for the purpose of improving the anti-slip effect.

The two abutment members 4at4b are connected at both ends of a support connecting rod 6 having a required length so as to be pivotable about an axis perpendicular to the extending direction of the connecting rod 6.

In the case of the illustrated embodiment, a pair of parallel connecting protrusions 7a, 7a and 7b, 7b are provided on the opposite side of the abutting members 4a and 4b from the surfaces in contact with the inner surface of the tube, respectively, and these protrusions 7a, ? Questions a and 7b, ? Both ends of the support connecting rod 6 are fitted between the ends of the support connecting rod 6, and shafts 8a and 8b are inserted therethrough, so that the abutting members 4a and 4b can be pivoted about the shafts 8a and 8b. It is provided so that it can pivot in the direction of the generatrix of the curved contact surface.

The diameter between the contact surfaces of the circumferential abutment members 4a, 4b with the inner surface of the tube is held parallel to each other, and is determined by the angle formed between the support connection rod 6 and the circumferential surface. Contact member 4
a.

The maximum diameter when the pipes 4b are arranged in a straight line is set to be slightly larger than the diameter (inner diameter) of the pipe to be used.

A hydraulic ram is attached to the support connecting rod 6 via a wire rope 9 or a checker 7, etc., at a suitable location near one end side from the center of the support connecting rod 6, that is, the center between the circumferential contact members 4a and 4b, as shown in the figure. A tension means 10 such as a lever block is connected.

The connection structure between the support connecting rod 6 and the tension means 10 is 1,
As shown in the figure, a ring-shaped connecting portion 1 is formed on a part of the supporting connecting rod 6.
1 is provided, and the end of the wire rope 9 or the like connected to the tensioning means 10 is engaged with the connecting portion 11 by tying or other means. In addition, it is possible to implement various connection structures, in particular support connections. A tensioning means 10 can be freely connected to the rod 6.

The present invention is constructed as described above, and is used for insertion and joining of pipes in pipe fittings for medium and large diameter pipes, where a person can normally enter the pipe to work.
is the contact member 4a on the side closer to the connection part 11 with the tensioning means 10
Insert the circumferential contact member 4 into the existing pipe 12 with the
Set the anti-slip means 5a and 5b of a and 4b in a predetermined position so that they are in contact with the inner surface of the pipe, and then connect the pipe to be connected to the existing pipe 12, that is, the connecting pipe 13, to the existing pipe 12. With the receptacle 2 and the receptacle 3 facing each other and in contact with each other while being positioned substantially on the same axis, the support connecting rod 6 is
The tensioning means 10 connected to a location near the contact member 4a on the inner side of the pipe is pulled out from inside the connecting pipe 13, and the end of the wire rope 14, etc. on the other end side of the tensioning means 10 is connected to the connecting pipe 13. The opposite end thereof is engaged with a pressing member 15 made of a pressed square material, steel material, etc. by binding or other means, and set in a tensioned state as shown in FIG. 4.

Then, the tensioning device 10 such as a hydraulic ram can be operated to pull the joining device A of the present invention set inside the existing pipe 12.
A circumferential contact member 4a inscribed in the existing pipe 12.

4b, the side of the abutment member 4a on the innermost side of the pipe is particularly strongly pulled, and the circumferential abutment members 4a, 4b are provided with anti-slip means 5a.
*5b is applied and the circumferential abutment members 4a and 4b are pivotally provided at both ends of the support connecting rod 6, so that the support connecting rod is inclined with respect to the diameter direction of the pipe due to the tensile action. 6 is rotated around the abutting member 4b as a fulcrum, and as a result, a tensioning action is generated on the inner surface of the tube, thereby causing the circumferential abutting member 4a.

4b comes into strong pressure contact with the inner surface of the tube, and in particular, as the tensile force increases, the adhesion force to the inner surface of the tube increases.

Therefore, the joining device of the present invention is reliably held in a predetermined position of the existing pipe 12 so that it does not move, and therefore, the connecting pipe 13 can be pulled in the direction of the existing pipe 12 by the above-mentioned tensile action, and the connection pipe 13 can be pulled and moved in the direction of the existing pipe 12.
can be inserted into the socket 2 and joined.

As described above, by using the joining instrument of the present invention, the pipe joining operation can be performed inside the pipe, and the work can be carried out safely without the dangers that would occur when joining the pipe from outside the pipe.

Moreover, the joining device has a simple structure and is easy to handle.In particular, it uses the tensile force during pipe joining to increase the adhesion force to the inner surface of the pipe, and uses this adhesion force to set it inside the pipe, making the setting work easy. Workability can be greatly improved.

In addition, since the adhesion force to the inner surface of the tube increases with the tensile force, the welding device can be reliably held at a predetermined position in the tube without any latching parts without fear of movement, and the tubes can be joined without any inconvenience. can be done.

In addition, the abutment member that is brought into close contact with the inner surface of the tube is equipped with anti-slip means such as a rubber plate, so the anti-slip effect not only ensures movement control during setting, but also prevents the rubber plate from slipping. The elasticity of the stopper means can protect the inner peripheral surface of the pipe, and even if the pipe to be joined is a so-called cement-lined pipe with a cement lining on the inner periphery, it will not damage the lining or the acrylic resin coating on the lining surface. There is a possibility that it will be carried out.

Furthermore, the joining device of the present invention can be used regardless of slight differences in diameter due to its structure, and can also be used with other general pipes.

As described above, the present invention is extremely suitable as a joining instrument for joining medium-sized and large-diameter pipes from inside the pipe, which allows a person to work inside the pipe.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a part of a pipe joint, Fig. 2 is a side view showing an embodiment of the present invention, Fig. 3 is a front view of the same, and Fig. 4 is a pipe using the joint device of the present invention. FIG. 2 is a schematic cross-sectional view showing a bonded state. 4a, 4b...Abutment member, 5a, 5b...
...Slip prevention means, 6...Support connecting rod, 8a,
8b... shaft, 10... tensile means, 12
...Existing pipe, 13...Pipe to be connected.

Claims (1)

[Scope of utility model registration request] Two abutting members each having a non-slip means such as rubber on the surface that faces the inner surface of the pipe are attached at both ends of a support connecting rod of a required length with an axis orthogonal to the extending direction of the connecting rod. A pipe joining device characterized in that the pipes are connected to each other so as to be pivotable about the center, and a tensioning means is connected to the supporting connecting rod at an appropriate position near one end side from the center between both liquid contact members. .