JPH03195311A - Method of laying signal wire in conduit - Google Patents

Abstract

PURPOSE:To reduce man-power and work time by holding a porous sheet, impregnated with thermoset synthetic resin, between a planar heating sheet applied with signal wires and the wall face of a conduit, curing the synthetic resin with the heat supplied from the planar heating sheet, and securing the porous sheet and the signal wires onto the wall face of the conduit. CONSTITUTION:Nonwoven fabric part of a porous body is impregnated with thermoset epoxy resin and applied tightly onto a PVC insulated wire, stretched onto the wall face of a concrete sewer, and then supported by a rubber balloon from the inside. Power is then fed to planar heating elements in order to cure the synthetic resin. When the balloon is removed subsequently and the planar heating element is peeled off, a fiber reinforced synthetic resin layer burried with the wire and applied with a polyethylene layer on the surface is formed on the inner wall face of the sewer.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of laying a signal line along a pipeline such as a sewer pipe or a tunnel.

(Prior Art) When laying signal lines such as electric wires and optical fibers, they are usually installed in the air using utility poles or the like, or they are housed in troughs and buried underground. Signal lines laid underground are relatively less susceptible to damage from the outside, but once they are damaged, it is necessary to dig them out and search for the faulty area, which requires a great deal of cost and man-hours.

Therefore, it was proposed to use existing underground common ditches and sewage pipes and lay signal lines inside them. Signal lines laid within such conduits are less susceptible to damage from the outside and are relatively easy to maintain; however, conduits are used for purposes other than the signal lines; There are restrictions on the installation position of the signal line, and it was common practice to install a support member on a wall or ceiling and suspend it from this.

However, this installation method requires a lot of man-hours, such as embedding the base and driving in anchor bolts to attach the support member to the wall surface.
Since the supporting member protrudes, there is a risk of colliding with objects moving inside the pipe, and sewer pipes in particular are susceptible to injury from floating objects when the water rises.

(Problems to be Solved by the Invention) Therefore, the present invention requires less man-hours when laying a signal line on the wall of a conduit and can proceed with the construction in a short time.
Moreover, it is an object of the present invention to provide a method of laying a signal line in which there is no risk of collision with other moving objects, and even in the event of a collision, the signal line is less likely to be injured.

(Means for Solving the Problems) An object of the present invention as described above is to sandwich a porous sheet impregnated with a thermosetting synthetic resin and a signal line between a planar heating sheet and a pipe wall surface. Alternatively, a porous sheet impregnated with a thermosetting synthetic resin and having a signal line penetrated therein is sandwiched between the planar heating sheet and the conduit wall, or a planar heating sheet with a signal line extending therethrough is sandwiched between the planar heating sheet and the pipe wall surface. A porous sheet impregnated with a thermosetting synthetic resin is sandwiched between the pipe wall surface, the synthetic resin is cured by the heat of the planar heated sheet, and the porous sheet and the signal line are placed on the pipe wall surface. This can be achieved by a method of laying a signal line inside a conduit, which is characterized by fixing the signal line to .

In the present invention, the signal line to be installed may be an electric wire or an optical fiber, but is not particularly limited.

Further, this signal line may be a single line or a cable made up of a plurality of lines.

Further, although a protective coating is not necessarily required, it is preferable to provide a protective coating in order to make the device less susceptible to damage from the outside.

The porous sheet used in the present invention can be impregnated with a liquid and preferably has flexibility, such as woven fabric, knitted fabric, nonwoven fabric, paper, etc. formed from organic or inorganic fibers. Alternatively, it may be a sponge body made of synthetic resin.

It is preferable that the strength of such a porous sheet does not decrease even when it comes into contact with the thermosetting synthetic resin to be impregnated, and it is more preferable that the porous sheet acts as a reinforcing material for the hardened synthetic resin.

The thermosetting synthetic resin used in the present invention may be a resin that is liquid at the time of use, can be impregnated into the porous sheet, and can strongly adhere to the pipe wall surface by thermosetting, such as an epoxy resin. , urethane resin type, polyester resin type, etc. can be selected and used as appropriate.

Further, the planar heating sheet used in the present invention may be any sheet as long as it is flexible and can heat the thermosetting synthetic resin to its curing reaction temperature; for example, a resistance heating element may be provided inside the sheet. A device that generates heat when energized can be used, but the device is not limited to this, and any suitable device may be used as long as it meets the purpose of the present invention.

5- The planar heating sheet may be integrally bonded to the porous sheet by rough crimping, or may be used as a separate body. Furthermore, the planar heating sheet may be one that adheres to a thermosetting synthetic resin, and in some cases, it may itself have an easily peelable surface, or it may have an easily peelable layer provided on the surface. You can.

In carrying out the method of the present invention, the signal line laid on the pipe wall may be fixed to the wall at appropriate intervals, but it may be fixed to the wall continuously over its entire length. Good too. When all of the signal wires are fixed to the wall, there is no need to worry about external objects getting caught and damaging the signal wires.

The present invention will be explained below with reference to Examples.

(Example) A planar heating element was prepared by weaving flexible electric wires into both ends of a woven fabric having a width of approximately 30 cm, applying a conductive paint thereto, and then adhering vinyl chloride films to both sides. On the other hand, a porous body was prepared by adhering a polyethylene film to one side of a mat-like non-woven fabric made of glass fiber and polyester fiber, etc., and a sheet heating element was attached to the polyethylene film surface. Lamination and adhesion were carried out using adhesive.

The non-woven part 11j of this porous body is impregnated with a thermosetting epoxy resin, and the non-woven part is pasted onto the vinyl chloride insulated electric wire stretched along the wall of the concrete 1/water pipe. , supported from inside with a rubber balloon.

Next, electricity was applied to the planar heating element to heat it to 700C, and this was maintained for 1 hour to cure the synthetic resin. After that, when the balloon was removed and the planar heating element was peeled off, a fiber-reinforced synthetic resin layer with electric wires embedded inside and a polyethylene layer on the surface was formed fixed on the inner wall surface of the r-water pipe. .

(Effects of the Invention) According to the method of laying a signal line in a conduit according to the present invention, a signal line can be easily and quickly fixed to a wall without the need for drilling holes in the wall of the conduit. can. Therefore, there is an advantage that not only can the work load be reduced in a poor environment, but also the pipe wall can be reinforced instead of being damaged.

Furthermore, since the protrusion into the pipe can be kept to an extremely low level, collisions with other objects within the pipe can be reduced, and even if a collision occurs, there is extremely little risk of damage to the signal line. There is an effect.

Claims (3)

[Claims] (1) By sandwiching a porous sheet impregnated with a thermosetting synthetic resin and a signal line between a planar heating sheet and a pipe wall surface, and curing the synthetic resin with the heat of the planar heating sheet. A method for laying a signal line in a conduit, which comprises fixing a porous sheet and a signal line on the wall surface of the conduit. (2) A porous sheet with a signal line penetrated inside and impregnated with a thermosetting synthetic resin is sandwiched between a planar heating sheet and a pipe wall, and the synthetic resin is heated by the heat of the planar heating sheet. A method for laying a signal line in a conduit, the method comprising fixing the porous sheet and the signal line on the wall surface of the conduit by curing the porous sheet. (3) A porous sheet impregnated with a thermosetting synthetic resin is sandwiched between a planar heating sheet with extended signal lines and a pipe wall surface, and the synthetic resin is cured by the heat of the planar heating sheet. A method for laying a signal line in a conduit, the method comprising: fixing a porous sheet and a signal line on a wall surface of the conduit.