JP3186236U - Pipe end anti-corrosion joint - Google Patents

Abstract

The present invention provides a pipe end anticorrosion joint capable of visually confirming the anticorrosion state of a pipe end when connecting an internally lined steel pipe and capable of performing the anticorrosion work of the pipe end more reliably.
A pipe end anti-corrosion joint 1 includes a first joint member 2 attached to a pipe end of an inner lining steel pipe P via a corrosion prevention member 4, and a second joint connected to the first joint member 2 in a sealed state. And a member 3. The inner lining steel pipe P is connected to the second joint member 3 by connecting the first joint member 2 and the second joint member 3 with the first joint member 2 attached to the end.
[Selection] Figure 1

Description

  The present invention relates to a pipe joint for connecting a lining steel pipe having a corrosion-proof lining through which various cables such as a communication cable such as an optical fiber cable and a power cable are inserted.

  Conventionally, as shown in FIG. 4, various cables such as a communication cable such as an optical fiber cable and a power cable are buried and laid in the ground beside a road. In that case, in order to protect a cable from the impact from the outside etc., a cable is penetrated and installed in a protection tube. A plurality of protective pipes are connected between hand holes, which are work spaces provided at predetermined intervals W (for example, 100 meters to several hundred meters), and are buried with concrete. Various pipes such as steel pipes and synthetic resin pipes are used as protective pipes. To prevent the pipes from corroding due to large amounts of water entering the protective pipes during heavy rains, use steel pipes. When used, an internally lined steel pipe having a synthetic resin layer on the internal surface of the steel pipe is used.

When connecting a plurality of inner lining steel pipes P so as to have a length W, it is necessary to carry out anticorrosion in order to prevent corrosion of the pipe end portion at the connection part. In general, a pipe end anticorrosion joint provided with an anticorrosion function is used for anticorrosion of the pipe end. There are various types of pipe end anticorrosion joints for inner lining steel pipes. For example, Patent Literature 1 describes a pipe joint 10 for a steel pipe shown in FIG. The pipe joint 10 for a steel pipe includes a joint body 11 having a female threaded portion in which a male threaded portion of an inner lining steel pipe P is screwed into an inner diameter portion, a stopper ring 12 threaded into the female threaded portion, and the stopper An elastic sealing material 13 is provided on the inner diameter side of the ring 12 and compressed between the pipe end and the stopper ring 12, and the pipe end is sealed by compressing the elastic sealing material 13 at the end of the inner lining steel pipe P. By doing so, anticorrosion is performed. According to this pipe end anticorrosion joint, the stopper ring 12 integrally assembled with the elastic seal material 13 can be screwed into the joint main body 11, so that the elastic seal material 13 can be easily assembled. Moreover, according to this pipe joint 10 for steel pipes, the stopper ring 12 and the elastic seal material 13 protrude toward the pipe inner diameter side by providing the inner diameter dimension of the stopper ring 12 substantially the same as or larger than the inner diameter dimension of the inner lining steel pipe P. Therefore, it is possible to easily insert the cable while suppressing the level difference of the connecting portion.
As described above, when the pipe end anticorrosion joint 10 is used to perform connection work in accordance with the correct procedure, the pipe end anticorrosion of the inner lining steel pipe P can be reliably and easily performed, and further, the level difference of the connection portion can be reduced. It can be kept small.

JP 2011-94704 A

  However, in the unlikely event that the elastic seal material 13 is removed from the stopper ring 12, the connection work is performed, or the elastic seal material 13 is turned over at the time of connection, so that the contact between the elastic seal material 13 and the pipe end is poor. Even if the connection work is performed, the connection location cannot be confirmed from the outside after connection because the connection location is inside the joint. If the connection with the pipe end is in a poor state, when rainwater containing calcium chloride or the like enters the inner lining steel pipe P, the metal layer exposed to the pipe end is exposed to water and corroded. When the corrosion of the metal layer proceeds, the lining material on the inner surface of the inner lining steel pipe P is easily peeled off. Then, when newly inserting various cables or pulling out various unnecessary cables, the cables get caught in the lining material and increase the separation of the lining material. May be blocked. When the lining material peels in this way, it may occur that the insertion of various cables is hindered. Therefore, in order to prevent corrosion of the end metal layer of the lining steel pipe that causes this problem, the present invention can visually check the corrosion prevention state of the pipe end when connecting the inner lining steel pipe. An object of the present invention is to provide a pipe end anticorrosion joint capable of performing the anticorrosion work of the pipe end more reliably.

In order to achieve the above object, the pipe end anticorrosion joint of the present invention is:
A first joint member attached to the pipe end of the inner lining steel pipe via a corrosion prevention member;
A second joint member connected in a sealed state with the first joint member;
The inner surface lining steel pipe is connected to the second joint member by connecting the first joint member and the second joint member in a state where the first joint member is attached to an end portion. .

  Moreover, in the pipe end anticorrosion joint of the present invention, it is preferable that both the first joint member and the second joint member are made of a synthetic resin material.

  According to the pipe end anti-corrosion joint of the present invention, the first joint member is attached to the pipe end of the inner lining steel pipe via the anti-corrosion member, and the inner lining steel pipe whose pipe end is securely prevented from corroding is connected to the first joint. By connecting the member and the second joint member, the inner lining steel pipe is connected to the second joint member. As described above, first, the connection between the lining steel pipe and the first joint member is surely performed, and the state of the pipe end anticorrosion and the stepped state of the connecting portion are visually confirmed, and then the connection between the first joint member and the second joint member is performed. By performing the above, the pipe end anticorrosion connection of the inner surface ringed steel pipe can be reliably and easily performed.

It is a half section view of a pipe end anti-corrosion joint concerning one embodiment of the present invention. It is an exploded view of a pipe end anticorrosion joint according to an embodiment of the present invention. It is a half-cut sectional view of the pipe end anti-corrosion joint according to another embodiment of the present invention. It is a schematic diagram which shows the use condition of the pipe end anti-corrosion joint which concerns on this invention. It is sectional drawing which shows a prior art.

Hereinafter, a pipe end anticorrosion joint according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
As shown in FIG. 1, the pipe end anticorrosion joint 1 according to the first embodiment of the present invention is a member for connecting the inner lining steel pipe P, and includes a first joint member 2, a second joint member 3, and the like. , And an anticorrosion member 4 for anticorrosion of the pipe end of the inner lining steel pipe P.

  The first joint member 2 includes a first female screw portion 21 that is screwed to a pipe male screw portion P1 formed at an end portion of the inner surface lining steel pipe P, and a first male screw that is screwed to a second joint member described later. A bottomed cylindrical shape having a body portion 23 formed with a portion 22 and a first wall portion 24 that abuts against the pipe end via the anticorrosion member 4 when screwed into the inner lining steel pipe P and attached to the pipe end. It is a member. The inner diameter dimension of the first wall portion 24 is such that when the first joint member is attached to the end portion of the inner surface lining steel pipe P, the inner wall lining steel tube P does not protrude to the inner diameter side of the inner surface lining steel pipe P and cause a step. It is formed so as to be the same as or slightly larger than the inner diameter dimension.

  The second joint member 3 includes a second female screw part 31 into which the first male screw part 22 formed in the first joint member 2 is screwed and a second wall part 32 against which an end of the first joint member abuts. It is a shaped member. Similarly to the first wall portion 24, the inner diameter size of the second wall portion 32 is formed to be the same as or slightly larger than the inner diameter size of the inner surface lining steel pipe P.

  Since the first joint member 2 and the second joint member 3 are required to have corrosion resistance at least on the inner surfaces of the first wall portion 24 and the second wall portion 32 that may come into contact with the liquid as in the case of the inner surface lining steel pipe P, the corrosion resistance. It is formed with the material which has. As long as it is a metal material, stainless steel having corrosion resistance or a steel material in which a liquid contact portion is coated with a resin can be used. Further, it is also possible to use a synthetic resin material such as hard vinyl chloride which is lighter than a metal material and can be manufactured at a low cost.

  Next, the connection procedure of the inner lining steel pipe P by the pipe end anticorrosion joint 1 will be described with reference to FIG. In addition, since the pipe end anticorrosion joint 1 of this Embodiment has a left-right symmetric structure, one structure is demonstrated and the other description attaches | subjects the same code | symbol and abbreviate | omits the description. First, a pipe male thread part P1 is formed at the end of the inner surface lining steel pipe P to be connected, and the first female thread part 21 of the first joint member 2 is screwed into the pipe male thread part P1 so that the first joint member 2 is Attach to the end of inner lining steel pipe P. At this time, the anticorrosion member 4 is interposed between the end portion of the inner surface lining steel pipe P and the first wall portion 24. The anticorrosion member 4 is a disk-like elastic plate having an inner diameter dimension substantially the same as or slightly larger than the inner diameter dimension of the inner lining steel pipe P and the first wall portion, and is compressed between the pipe end portion and the first wall portion 24. The end of the inner lining steel pipe P is sealed. The material of the anticorrosion member 4 is an elastic material having elasticity and corrosion resistance. For example, the anticorrosion member 4 is used as a snow melting agent for roads and is corrosion resistant to water containing calcium chloride which causes corrosion of the pipe end of the inner lining steel pipe. Chloroprene rubber (CR), nitrile butadiene rubber (NBR), etc. having the following can be used. As a result, the portion of the metal layer exposed at the tube end is protected against corrosion. At this time, it is visually confirmed from the outside of the first wall portion 24 that the anticorrosion member 4 is correctly attached to the end portion of the inner surface lining steel pipe P without protruding toward the inner diameter side of the inner surface lining steel pipe P.

  Next, the first male screw portion 22 formed on the first joint member is screwed into the second female screw portion 31 of the second joint member 3 to connect the second joint member 3 and the inner surface lining steel pipe P. The inner lining steel pipe P is screwed in until the end surface of the first joint member 2 abuts against the second wall portion 32. In this way, the inner-lined steel pipe P is protected in advance by attaching the first joint member to the pipe end portion, and is connected to the second joint member after confirming it by visual observation. Reliable connection of the inner lining steel pipe P can be realized.

  Next, as shown in FIG. 1, the connection portion between the inner lining steel pipe P and the second joint member 3 is sealed by a watertight seal member 5. Thereby, the 1st coupling member 2 and the 2nd coupling member are connected in the sealed state, and it is prevented that water etc. penetrate | invade into a connection location from the exterior. As the sealing member 5, for example, a butyl tape for piping made of butyl rubber can be used.

(Second Embodiment)
Moreover, the pipe end anticorrosion joint of the present invention is connected to the inner end lining steel pipe P (left side in the figure) of the pipe end anticorrosion joint 1 'shown in FIG. Similarly, a connection structure is formed by the first joint member 2 and the second joint member 3 ′, and the other (right side) inner lining steel pipe P is connected by directly screwing the pipe male thread portion P1 and the second joint member 3 ′. It can also be structured. On the other side (right side in the drawing) of the second joint member 3 ′, a second female screw portion 31 ′ into which the pipe male screw portion P1 is screwed is provided on the inner diameter portion, and the inner side of the second female screw portion 31 ′ is provided. Is formed with a second wall portion 32 ′ against which the inner lining steel pipe P abuts via the anticorrosion member 4. Moreover, also in this pipe end anticorrosion joint 1 ', according to this pipe end anticorrosion joint 1' in which the connection part of the inner lining steel pipe P and the second joint member is sealed by the seal member 5, the first embodiment is implemented. As with the pipe end anticorrosive joint 1 of the embodiment, the pipe end anticorrosion state and the stepped state of the connecting portion can be visually confirmed from the end portions of the first joint member and the second joint member, so that the inner surface ringing The pipe end anticorrosion connection of the steel pipe can be reliably and easily performed. Further, since the pipe end anticorrosion joint 1 'is directly screwed into the second joint member 3' on the other inner lining steel pipe P, the left and right inner linings are formed with fewer parts than the pipe end anticorrosion joint 1 shown in FIG. The pipe end anticorrosion connection of the steel pipe P can be performed.

P: inner lining steel pipe, P1: pipe male thread part 1, 1 ': pipe end anticorrosion joint, 10: pipe joint for steel pipe 2: first joint member 21: first female thread part, 22: first male thread part, 23: trunk part, 24: first wall part 3, 3 ′: second joint member 31, 31 ′: second female thread part, 32, 32 ′: second wall part 4: anticorrosion member 5: seal member 11: Joint body 12: Stopper ring 13: Elastic seal material

Claims (2)

A first joint member attached to the pipe end of the inner lining steel pipe via a corrosion prevention member;
A second joint member connected in a sealed state with the first joint member;
The inner surface lining steel pipe is connected to the second joint member by connecting the first joint member and the second joint member in a state where the first joint member is attached to an end portion. Pipe end anticorrosion joint. The pipe end anticorrosion joint according to claim 1, wherein the first joint member and the second joint member are both formed of a synthetic resin material.

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