JP2008240943A - Coupling connection tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupling connection tool facilitating work for connecting a pipe made of plastic by a fusion coupling and attaining accurate and secure attachment of a pipe to a coupling socket and its stable fixing. <P>SOLUTION: In the coupling connection tool, both ends connected to each other of the pipe made of plastic are inserted to the coupling socket and connection/fixing is performed by thermal fusion. The coupling connection tool has a towing tool for connecting and towing a pair of clamps previously detachably fastened to outer peripheries of both ends of the pipe made of plastic prior to connection/fixing by the thermal fusion and a pair of clamps fastened to the pipe made of plastic. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a jig used for joint connection of plastic pipes, and particularly to a joint connection tool for inserting and fixing both ends of plastic pipes connected to each other into a joint socket. It is.

  Polyolefin-based plastic pipes such as polyethylene are lightweight and flexible, and have excellent corrosion resistance and durability. Therefore, water supply pipes such as waterworks, waterworks and sewers, agricultural water pipes, fire hydrant pipes, In recent years, it has been widely used in various applications such as chemical transport pipes, seabed pipes, seawater intake pipes, hot water supply pipes, bridge bridge pipes, suspension pipes, and mountain pipes (for example, see Patent Document 1).

  For example, high-density polyethylene (HDPE) pipes and crosslinked polyethylene pipes are used in many applications described above because they have excellent mechanical and chemical properties such as wear resistance and corrosion resistance. As a method of connecting these plastic pipes, a method of connecting and fixing both ends of the pipes connected to each other into a joint socket and connecting them by heat fusion by energization is conventionally performed (Patent Document 2).

  FIG. 1 is a schematic view showing a construction method of an electrofusion joint using the above-described joint socket. This fusion joint connection is, for example, a method in which a pipe body is connected by heating and fusing by passing a current through a heating wire (electric heater) embedded in a cylindrical joint member made of polyethylene in advance. In this method, as shown in FIG. 1, the ends of the two pipe main bodies 1 are inserted into the joint socket 2 and fixed, and the connector of the controller 3 is connected to the terminal pin 4 of the joint socket 2 and set in advance. Fusion is performed by energizing under the above conditions, and the fusion joint connection is completed by cooling. Such a fusion joint is excellent in that a reliable joint can be obtained by a quick and simple process.

  By the way, in the joint formation by the above-described fusion joint, it is necessary to insert the end portions of the left and right pipes 1 into the joint socket 2 up to a predetermined position, but this operation is performed manually by an operator. Therefore, this insertion operation requires skill as the diameter of the pipe increases. Since the heating wire is wound inside the joint socket, the heating wire may be cut or damaged unless the pipes are accurately inserted parallel to the axial direction. Furthermore, the thermal expansion during the thermal fusion may cause a reverse stress in the pipe, and therefore the movement caused by the stress during the thermal fusion and cooling of the pipe (the movement of the pipe being pushed out of the joint socket). There is also a need to prevent.

There is a problem that poor fusion occurs when accurate and reliable mounting and stable fixing of the pipe to the joint socket are not performed.
JP 2005-155787 A Japanese Patent No. 3684390

  The present invention has been made in view of the above-described problems of the prior art, and facilitates the work of connecting plastic pipes by fusion joints, and also enables accurate and reliable attachment of the pipes to the joint sockets. It is an object of the present invention to provide a joint connecting tool that enables stable fixation.

  In order to solve the above-described problems, a joint connecting tool according to the present invention is a joint connecting tool for inserting and fixing both ends of a plastic pipe connected to each other into a joint socket and thermally fixing them. A pair of clamps that are detachably fastened to the outer circumferences of both ends of the plastic pipe in advance prior to the connection fixing by the heat fusion, and a pair of clamps fastened to the plastic pipe. And a traction tool for towing each other.

  In a preferred aspect of the present invention, the clamp has a plurality of eyebolts, and is constructed so that a chain block is connected to the plurality of eyebolts and the two clamps are pulled close to each other in the axial direction of the pipe.

  Furthermore, in a preferred aspect of the present invention, the clamp is configured to be fastened and fixed to the outer periphery of the pipe while connecting and integrating the divided partial clamps with clamp bolts.

  According to the joint connecting tool according to the present invention, by configuring as described above, accurate and reliable mounting of the pipe to the joint socket at the time of fusion joint work and stable fixing thereof can be performed with simple work. It has an excellent effect of being able to.

  As described above, the joint connection tool according to the present invention is a joint connection tool for inserting and fixing both ends of a plastic pipe connected to each other into a joint socket, and heat-sealing the joint. Prior to connecting and fixing by wearing, a pair of clamps that are detachably fastened to the outer periphery of both ends of the plastic pipe in advance and a pair of clamps fastened to the plastic pipe are connected and pulled together. It is characterized by having a traction tool.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 is an external view showing an example of the joint connecting tool according to the present invention. In this example, it is an external view which shows an example in the case of using the joint connection tool of this invention when performing the fusion joint work as shown in FIG. 1, and the edge part of a pair of right and left piping 1 is a joint socket. When inserting into 2, the pair of clamps 5 is first fastened to the outer periphery of the pipe end.

  FIG. 3 is a cross-sectional view showing an example of such a clamp. In this example, the clamp 5 is divided into three parts 5a, 5b, and 5c, and each part has clamp bolts 6a, It is connected and fixed when fastened to the outer periphery of the pipe end by 6b and 6c. The number of divisions of the clamp is not limited to three as in this example, but considering the improvement of work efficiency and uniform traction stress, it is preferable to configure the division into three or two divisions.

  Further, in this embodiment, eyebolts 7a, 7b and 7c are provided so as to protrude in the outer peripheral direction of each divided clamp, and as shown in FIG. 2, a chain block 8 as a traction tool is provided on the eyebolt. Is moored. In this state, the chain blocks 8 (three places) are moved evenly to pull both clamps 5 close to each other in the axial direction and insert them to a predetermined position of the joint socket 2. Further, heat fusion is performed by energizing in a fixed state. Although stress may be exerted to push out the pipe during the heat fusion and cooling, according to the apparatus of the present invention, the end of the pipe is stably placed at a predetermined position in the joint socket. Since it is fixed, the possibility of causing a fusing defect due to stress movement is also eliminated.

  As described above, by using the joint connecting tool according to the present invention, it is possible to accurately attach the pipe to the joint socket by a relatively simple and labor-saving operation, so even if the pipe has a large diameter. It becomes possible to perform mounting and fixing with high accuracy in a stable and safe manner. In addition, both pipes are firmly fixed by the clamp and traction tool at the time of fusion, so that the phenomenon of extrusion from the pipe joint socket due to thermal expansion is prevented, and the entire joint is securely fixed. Stable holding from the process to the completion of cooling is also ensured.

The schematic diagram which shows the construction method of a fusion joint. The external view which shows one embodiment of this invention. Sectional drawing of the clamp which concerns on one embodiment of this invention.

Explanation of symbols

1 Piping 2 Joint socket 3 Controller 4 Terminal pin 5 Clamp 6a, 6b, 6c Clamp bolt 7a, 7b, 7c Eye bolt 8 Chain block

Claims (3)

A joint connection tool for inserting and fixing both ends of plastic pipes connected to each other into a joint socket, and fixing them by heat fusion,
A pair of clamps that are detachably fastened to the outer periphery of both ends of the plastic pipe in advance prior to the connection fixing by the thermal fusion;
A joint connecting tool, comprising: a traction tool for connecting and pulling a pair of clamps fastened to the plastic pipe.   The joint connection tool according to claim 1, wherein the clamp has a plurality of eyebolts, and a chain block is connected to the plurality of eyebolts so that the clamps are pulled closer to each other in the axial direction of the pipe.   The joint connection tool according to claim 1, wherein the clamp is configured to be fastened and fixed to the outer periphery of the pipe while connecting and integrating a plurality of partial clamps divided by a clamp bolt.

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