JPH022158Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of a connecting portion of a pipe line in which the inner surface of the pipe to be connected by welding is lined.

In recent years, the repair, reinforcement, or durability improvement of aging parts of gas pipes, water pipes, communication lines, power lines, oil pipelines, etc., which are mainly buried underground, has been increasing. For this purpose, lining is carried out.

One of the methods for lining this lining is to apply a lining material with a watertight and airtight film formed on the outer surface of a cylindrical woven fabric, apply adhesive to the inner surface, and apply fluid pressure to the back side. It is inserted into the pipe and adhered to the inner surface of the pipe using the adhesive.

With this method, there is no need to dig up the entire length of the pipeline; it is only necessary to excavate both ends of the pipeline to be lined, and the lining work itself can be completed in a short period of time. It is a method that can be applied over pipelines, and can even be applied to pipelines with many bends, and has been attracting particular attention in recent years as an extremely excellent method.

By the way, with this method, it is possible to construct a long section of several hundred meters at a time, but no matter how long a section can be constructed, the length is still finite; It cannot be constructed over a long length, and there will always be terminals on both sides of the construction section. Therefore, after the lining work is completed, it is necessary to connect the terminal to the adjacent section to restore the pipeline system, and this connection requires a special structure.

In this connection, since the connection itself constitutes a part of the pipe system, the inside of the pipe should not be narrowed due to the connection, and the inside of the pipe should not be narrowed. It is necessary to ensure a secure connection while ensuring a sufficient flow path. Furthermore, the ends of the lining material lining the inner surface of the pipe must not peel off from the pipe. In particular, if the fluid in the pipe enters between the pipe and the lining material from the end thereof, the lining material will be peeled off from the inner surface of the pipe, so it is necessary to reliably prevent this fluid from entering.

In addition, one of the purposes of lining a pipe is to improve the durability of the pipe, so if the durability of the connection part is lower than that of other parts, it should be avoided. Because it is not,
The connection is required to be as durable as or more durable than other lined conduit sections.

In particular, as mentioned above, this type of pipeline is usually buried underground, and the connection part of this pipeline is buried back into the ground after construction is completed, so there is no possibility of a problem with the connection part. Just because something has happened, it is not possible to simply dig it up and reconnect it.
Therefore, rather than considering ease of attachment and detachment as with ordinary pipe connections, strength and durability of the connection part is required, and from this point of view, rather than connecting with flanges or special joints, It is preferable to firmly weld the connection.

However, when welding pipes, high heat is applied to the welded part, but the lining material must not be damaged or peeled off from the inner surface of the pipe by the heat. In addition, the various requirements mentioned above must be met even when the heat of welding is applied.

The present invention was developed in view of the above circumstances, and involves connecting the end portions of lined pipes to each other by welding, and preventing the inside of the pipe from becoming narrow or obstructing the flow of fluid at the connecting portion. In addition, the lining material is not affected by the heat of welding, effectively prevents fluid from entering from the end of the lining material, and has durability equal to or higher than that of lined pipes. The purpose is to provide a new connection structure.

Therefore, the present invention provides a lined conduit,
The lining material at the end of the pipe has been removed,
A corrosion-resistant metal tube is inserted into the conduit from the end of the lining material to the portion from which the lining material has been removed, and the end of the metal tube is made to match the end of the conduit, and the metal tube is The pressure is expanded and the inner surface of the lining material and the pipe are crimped, and the end of the pipe and the metal pipe are opposed to each other, and the end of the joint pipe is welded to the end of the pipe and the metal pipe. It is characterized by the fact that

Embodiments of the present invention will be described below with reference to the drawings. In the figure, 1a and 1b are conduits, and the conduit 1
The inner surfaces of a and 1b are lined with lining materials 2a and 2b. The lining materials 2a, 2b are removed at the end portions of the pipes 1a, 1b. Metal pipes 3a, 3b are inserted into the pipes 1a, 1b from the ends of the pipes 1a, 1b to the ends of the lining materials 2a, 2b, and the ends of the metal pipes 3a, 3b are , said conduit 1
It matches the terminals a and 1b.

These metal pipes 3a, 3b are made of corrosion-resistant metal such as stainless steel, and are expanded in the diametrical direction within the pipes 1a, 1b, and are made of a corrosion-resistant metal such as stainless steel. It is crimped on the inside. Therefore, the lining material 2 is
The terminal parts of the lining materials 2a and 2b are pressed against the inner surfaces of the pipes 1a and 1b, and the terminal parts of the lining materials 2a and 2b are pressed against the inner surfaces of the pipes 1a and 1b.
It is firmly fixed without peeling off from the inner surface of 1b.

Further, in this embodiment, a reactive hardening agent such as an epoxy adhesive is applied to the space surrounded by the inner surfaces of the pipes 1a and 1b, the end surfaces of the lining materials 2a and 2b, and the outer surfaces of the metal pipes 3a and 3b. adhesive 4a,
4b is filled with the lining materials 2a, 2b, and the fluid in the pipes 1a, 1b penetrates into the wall thickness of the lining materials 2a, 2b.
It is designed to prevent the adhesive between the pipes 1a and 1b from breaking off and to prevent leakage from defective parts of the pipes 1a and 1b.

5 is a connecting pipe that connects the ends of the pipes 1a and 1b. In the joint pipe 5, a joint pipe lining material 7 is pasted inside a short pipe 6, and the joint pipe lining material 7 is removed from the end portions of both ends, just like the pipes 1a and 1b. The metal pipes 8a and 8b are inserted and the pressure is expanded, and the end portion of the joint pipe lining material 7 is pressed against the inner surface of the short pipe 6, and although the joint pipe 5 itself is short, it is similar to the pipe lines 1a and 1b. It has a structure.

The joint pipe 5 is interposed between the ends of the pipe lines 1a and 1b, and is connected to the pipe line 1 at both ends.
It is welded to the terminals a and 1b. 9 is a welded portion thereof, and the welded portion 9 is connected to the metal tubes 3a, 3.
The pipes 1a, 1b, the short pipe 6, the metal pipes 3a, 3b, and the metal pipes 8a, 8b of the joint pipe are all welded together. This effectively prevents fluid from entering between the pipes 1a, 1b and the metal pipes 3a, 3b.

In the embodiment, the joint pipe 5 has a joint pipe lining material 7 attached to the inner surface of the short pipe 6, and both ends thereof are connected to the pipe line 1.
A structure treated in the same manner as in a and 1b was used, but the structure of the connecting pipe 5 was a double pipe in which a corrosion-resistant metal short pipe such as stainless steel was fitted on the inner surface of the short pipe 6. You can also use Further, in a pipe line used under conditions where the pipe line is unlikely to be corroded, it is also possible to use a single-ply pipe as is.

According to the present invention, the pipe lines 1a and 1b are each connected to a joint pipe 5, and the metal pipes 3a and 3b are inserted into the inside of this connection part, and if necessary, the pipe line 1a and 1b are lined or metal pipes are inserted. Since only a short tube is fitted, there is almost nothing protruding inward, and a sufficient flow path is ensured. Further, the end portions of the lining materials 2a, 2b are firmly pressed against the inner surfaces of the conduits 1a, 1b by metal tubes 3a, 3b, and the metal tubes 3a, 3b and the conduit 1
Since the end faces of the metal pipes 3a and 1b are firmly welded at the welding part 9, the metal pipes 3a and 3b and the pipe line 1
a, 1b, and the lining material 2
There is no possibility that the pipes 1a, 1b will be separated from the pipes 1a, 1b.

Moreover, since the metal pipes 3a and 3b forming the inner surface of the connection part are made of a corrosion-resistant metal such as stainless steel, the pipe line at this connection part will not corrode and will last for a long time. It can withstand constant use.

Furthermore, since the end portions of the lining materials 2a, 2b are cut off and fixed with metal tubes 3a, 3b, when the metal tubes 3a, 3b and the pipe lines 1a, 1b are welded, the heat is used to weld the lining materials 2a, 3b. , 2b and the adhesive will not burn out.

Further, as shown in the embodiment, the inner surfaces of the pipes 1a and 1b, the end surfaces of the lining materials 2a and 2b, and the metal pipe 3
By filling the void surrounded by the outer surfaces of lining materials 2a and 3b with a reactive hardening adhesive, peeling of lining materials 2a and 2b due to fluid intrusion into the wall thickness of lining materials 2a and 2b, Fluid leakage can be prevented and the durability of the lining can be further improved.

The present invention relates to the structure of a connecting part at the end of a lined pipe, and the joint pipe referred to in this invention is limited to a pipe for connecting two opposing pipes as in the embodiment. It is not something that is done, but
It may be for connecting three or more pipes such as a T-shaped pipe or a cross pipe.

Further, the connecting pipe itself may be a pipe line that faces the lined pipe line. That is,
At the end of a long pipeline system, the existing pipeline is lined, the lining material is treated according to the present invention, and the newly installed pipeline is welded as a joint pipe according to the present invention,
The present invention can also be applied to cases where a pipeline system is extended.

Furthermore, the pipes to which the present invention is applied are not limited to pipes lined with lining materials as described above, but can also be applied to pipes whose inner surfaces are coated with rubber, epoxy resin, polyethylene resin, etc. is also possible.

[Brief explanation of the drawing]

The drawing is a central longitudinal cross-sectional view showing an embodiment of the conduit connection part of the present invention. 1a, 1b... Pipeline, 2a, 2b... Lining material, 3a, 3b... Metal tube, 4a, 4b... Adhesive, 5... Joint pipe, 6... Short pipe, 7... Joint pipe lining Material, 8...Metal pipe of joint pipe, 9...Welded part.

Claims (1)

[Claims for Utility Model Registration] 1. In a lined conduit, the lining material at the end of the conduit has been removed, and the portion of the conduit from which the lining material has been removed from the end of the lining material. A corrosion-resistant metal tube is inserted through the
The end of the metal pipe is made to match the end of the pipe, and the metal pipe is expanded and crimped to the inner surface of the lining material and the pipe, and a joint pipe is connected to the end of the pipe and the metal pipe. A structure of an end connection portion of a lined pipe line, characterized in that the joint pipes are faced to each other and the ends of the joint pipes are welded to the ends of the pipe line and the metal pipe. 2. Utility model registration claim 1, characterized in that a reactive hardening adhesive is filled in a void surrounded by the inner surface of the pipe, the end surface of the lining material, and the outer surface of the metal tube. Construction of lined conduit connections.