JPH05227625A - Method of laying signal wire covered with soft material in pipe - Google Patents

Abstract

PURPOSE:To get a laying method which does not damage a signal wire when laying a signal wire covered with a soft material in a pipe. CONSTITUTION:A signal wire a is laid by inserting a coil 10 first, making use of an inserter 11, and inserting the signal wire 1 into a pipe 1 via the coil 10, and withdrawing only the coil 10. Hereby, the signal wire a is never damaged by burrs since it is protested with the coil 10 at insertion. As a result, since the signal wire covered with ordinary synthetic resin or the like can be used, the cost of the signal wire is low, and also since the resistance in insertion is small, the insertion work is very easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of laying a signal line for communication or various measuring instruments covered with synthetic resin, rubber, woven fabric or the like in a pipe made of metal.

[0002]

2. Description of the Related Art When an elbow is used for a bent portion or a sleeve or the like is attached midway and a metal conduit is piped, the conduit is cut by a cutter at each connection point, and as shown in FIG. For example, in the bent portion 2 of the pipe 1, a burr 6 is formed on the cut end 5 of the straight pipe 4 connected to the elbow 3.

[0003]

For this reason, when the signal line a covered with synthetic resin or the like is drawn into the pipe 1 and laid, the burr 6 cuts off the signal line a. .. Therefore, conventionally, a metal coating which is not cut off by the burr 6 is provided on the outside of the signal line a. However, if such a thing is performed, the cost of the signal line a becomes high and the laying resistance increases when the extension distance becomes long. There is a problem that (slip resistance) becomes large and work becomes difficult. In particular, in the case of a small diameter pipe, it takes time to work.

An object of the present invention is to provide a method for efficiently laying a signal line covered with a flexible material without damaging the signal line with burrs in a pipe.

[0005]

A method of laying a signal line according to the present invention is as follows.

[0006] A long coil obtained by processing a metal wire into a coil is once wound in an inserting machine, and then while being rotated, the coil is pushed into a pipe by using the inserting machine and inserted.
Stop the insertion when the coil reaches the other end, then insert the signal line in this coil, stop the insertion when this signal line is exposed from the coil at the other end, leave the tip of the signal line as it is, or fix it Fix the outside of the pipe with a tool, then reverse the coil by inserting the reverse rotation of the insertion machine, pull back, and leave only the signal line in the pipe to lay the signal line covered with a soft material in the pipe. How to lay.

When the signal line is drawn into the coil, a string is inserted into the coil in advance, the coil is inserted into the pipe, and then the string is tied to the tip of the signal line.
The signal line may be drawn into the coil by pulling this string.

[0008]

EXAMPLE First, an insertion coil 10 made by winding a metal wire into a coil is wound into an insertion machine 11 as shown in FIG. 3, and this is rotated by the insertion machine 11 as shown in FIG. 1 is inserted into the pipe 1 from the end 1a, and the insertion is stopped when the coil 10 is exposed from the other end 1b of the pipe 1. FIG. 2 is a cross section of the coil. Next, as shown in FIG. 4, the signal line a is inserted into the coil 10 inserted into the pipe 1, and the signal line a is pulled out from the tip of the coil 10. The tip of the signal line a may be left as it is, or may be fixed to the outside of the pipe 1 by using a fixture 12 as shown in FIG. After that, the insertion machine 11 is rotated in the reverse direction to pull back the coil 10, and the coil 10 is recovered from the inside of the pipe 1. This situation is shown in FIG. FIG. 6 shows the condition of the signal line a remaining in the pipe 1,
This is the end of laying the signal line a.

In the above embodiment, there is no problem if the signal line a can be inserted into the coil 10 by itself, but if the signal line a is thin and does not have appropriate rigidity, and if there is an insertion distance. In some cases, it is difficult to insert the signal line a due to the large resistance. In such a case, a wire (string) such as a steel wire is previously drawn into the coil 10, this coil is inserted into the pipe 1 by the inserter 11, and then the signal wire a is connected to the wire. Signal line a by pulling the wire
May be drawn into the coil 10.

[0010]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, since the signal line is protected by using the coil and is inserted into the pipe and only the coil is recovered, it is assumed that the burrs are temporarily used when the signal line is inserted into the pipe. Even if there is, the signal line coating will not be scratched or cut. For this reason, it is possible to use a signal line coated with a low cost ordinary synthetic resin, rubber or woven fabric, and the coil is slippery and has flexibility when inserted, and it may be caught on a step due to rotation. Since it does not occur, there is an advantage that the work is very easy to do.

[Brief description of drawings]

FIG. 1 is an explanatory view of a situation where a coil is inserted in a pipe.

FIG. 2 is a sectional view of a coil.

FIG. 3 is an explanatory view of a coil inserting machine.

FIG. 4 is an explanatory view of a situation in which a coil is inserted into a pipe and a signal line is inserted into the coil.

FIG. 5 is an explanatory view of a situation where only the coil is pulled back from the inside of the pipe.

FIG. 6 is an explanatory view of a situation in which a signal line is laid inside a pipe.

FIG. 7 is an explanatory diagram of a conventional signal line installation situation.

[Explanation of Codes] 1 Piping 10 Coil 11 Inserter 12 Fixture a Signal line

Claims (2)

[Claims] 1. A long coil obtained by processing a metal wire into a coil is first wound into an inserting machine, and then, while being rotated, the coil is pushed into a pipe by using the inserting machine to insert the coil. Stop the insertion when it reaches the end, then insert the signal line in this coil, stop the insertion when this signal line is exposed from the coil at the other end, leave the tip of the signal line as it is, or use a fixture To fix it outside the pipe, and then rotate the inserter in the reverse direction to pull it back.
A method of laying a signal wire covered with a soft material in a pipe, in which only the signal line is left in the pipe by collecting. 2. The pipe according to claim 1, wherein after the coil in which the string is drawn is inserted into the pipe, the string is tied to the tip of the signal line and the signal line is drawn into the coil by pulling the string. A method of laying a signal line covered with a soft material.