JPH0454814A - Protection tube for signal cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a protection tube for signal cables that protect signal cables such as telephone lines, and more particularly to a protection tube for signal cables that prevents electromagnetic induction. It is.

2. Description of the Related Art Conventionally, cast iron pipes have been known as protection pipes for signal cables.

This cast iron protection pipe has the advantage of being highly durable when buried in the soil.In order to prevent water from entering the protection pipe when buried in the soil, Each cast iron pipe is connected to the joint with a sealant interposed.

Problems to be Solved by the Invention However, when cast iron pipes are used, they have electrical conductivity, but the electrical conductivity is not large enough.Furthermore, cast iron pipes have to be manufactured to appropriate lengths and cannot be integrally welded together. Instead, they are connected using a pipe joint with a sealing material interposed as described above.

As a result, the entire conduit of the protection tube does not constitute a conductor;
Therefore, there is a problem that a sufficient electromagnetic induction prevention effect, that is, an electromagnetic shielding effect cannot be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a protection tube for a signal cable that can sufficiently prevent electromagnetic induction.

Means for Solving the Problems In order to achieve the above object, the present invention has a socket at one end and a socket at the other end, and has a superconductor lining on almost the entire inner surface including the inner surface of the socket. and a connecting member made of a superconductor that electrically connects the superconductor linings on the inner surfaces of the socket and the insertion port of the pipe body that are joined to each other.

Function According to the above structure, since almost the entire inner surface of the tube is lined with superconductor, the conductivity of each tube is extremely high, and the receivers connected to each other at the pipe joints connecting the tubes are extremely high. Since the superconductor linings of the mouth and the socket are connected by the superconductor connecting member, the inner surface of the protective tube is covered with a continuous superconductor over the entire length. Therefore, a reliable effect of preventing electromagnetic induction can be obtained.

Embodiment In FIGS. 1 and 2, numeral 1 designates a signal cable protection tube for protecting a signal cable such as a telephone line, and is constructed by connecting a plurality of cast iron pipes 2.

The inner surface of this cast iron pipe 2 has lt! A conductor lining 5 is formed. Further, adjacent cast iron pipes 2 are joined by inserting the socket 4 of the other cast iron pipe 2 into the socket 3 of one cast iron pipe 2, and the inner peripheral surface of the socket 3 and the socket 4 are connected to each other. A sealing material 7 is interposed between the outer peripheral surface and the outer peripheral surface. An annular connecting member 6 made of superconductor and having a C-shaped cross section is integrally fitted to the tip of the socket 4 inserted into the socket 3 . This connecting member 6 is connected to the superconductor lining 5 on the inner surface of the socket 4.
The outer periphery is electrically connected to the superconductor lining 5 on the inner surface of the socket 3 by pressure contact.

Further, as shown in detail in FIG. 2, the socket 3 is formed in a reverse tapered shape that becomes smaller in diameter toward its open end, and the socket 4 is press-fitted into the socket 3 together with the connecting member 6 at its tip. The bonded state is maintained by fitting the two together.

According to this configuration, by using the cast iron pipe 2 as the protection pipe 1 of the signal cable, it is durable even when buried in the soil, and the socket 3 and the socket 4 of the electric railway pipe 2 are Since the sealing material 7 is interposed between the cable and the cable, it is possible to reliably prevent water or the like from entering the inside and protect the signal cable.

In addition, since the superconductor lining 5 is formed on the inner surface of the cast iron +i#2, the conductivity is extremely high, and the cast iron pipe 2
Also in the pipe joint part that connects the pipe, the superconductor lining 5 on the inner surface of the socket 3 and the superconductor lining 5 on the inner surface of the socket 4 are connected by the connecting member 6 made of superconductor, so that The inside of the signal cable protection tube 1 is continuously covered with superconductor over its entire length,
A large electromagnetic induction prevention effect, that is, an electromagnetic shielding effect can be obtained.

At the pipe joint part, the connecting member 6 is press-fitted into the socket 3 and strongly pressed against the inner surface thereof, so that the electrical resistance at this joint part is small and the above-mentioned effects can be fully exhibited. Furthermore, if an inorganic superconducting material such as ceramics is used for the electromotive conductor lining 5 and the #diaphragm member 6, an anticorrosion effect can be exhibited.

Effects of the Invention As described above, according to the present invention, since almost the entire inner surface of the tube is lined with a superconductor, the conductivity of each tube is extremely high, and the pipe joint that connects each tube is The superconductor linings of the socket and socket, which are joined to each other at the section, are connected by a contact member made of superconductor, so that the inside of the protective tube is covered with continuous superconductor over its entire length. Therefore, a large electromagnetic induction prevention effect can be obtained while using a plurality of tube bodies of a predetermined length.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention, with FIG. 1 being a sectional view showing its schematic structure, and FIG. 2 being an enlarged sectional view of a pipe joint portion thereof. 2...Cast iron pipe, 3...Socket, 4...Insertion 0.5...
- Superconductor lining, 6... connection member. Agent Yoshihiro Morimoto

Claims (1)

[Claims] 1. A tube body that has a socket at one end and an inlet at the other end, and is lined with superconductor over almost the entire inner surface including the inner surface of the socket; sockets of the tube bodies that are joined to each other. and a connecting member made of a superconductor that electrically connects the superconductor linings on the inner surface of the insertion port.