JP2871758B2 - How to lay a linear body - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method of laying a linear body used for laying a linear body such as an electric cable in a pipeline.

[Prior Art] When laying a linear body in a pipeline, a lead wire attached to the linear body via a pooling eye is introduced into the pipeline from one end of the pipeline through the manhole, and the other end of the pipeline is manholed. The linear body is pulled into the duct by being pulled by a winch installed nearby.

In this case, if the pipeline is long, a long linear body is necessary, but if the long linear body is wound around the drum, the drum becomes large and heavy, and the drum must be transported. Is not possible due to legal restrictions on transportation.

Therefore, in order to lay a linear body in a long pipeline, it is necessary to sequentially draw the short linear body into the pipeline and connect the linear body in the middle of the pipeline.

In this case, conventionally, the remaining linear members were drawn directly through the lead wire into the conduit in which the linear members were already drawn.

[Problems to be Solved by the Invention] For this reason, if the lead wire is pulled by the winch of the lead wire for drawing in the remaining linear body, the lead wire and the laid linear body are rubbed, and the laid linear body is damaged. There was a risk of doing.

An object of the present invention is to provide a method of laying a linear body that can lay a linear body while preventing damage to the already laid linear body even in such a long pipeline.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a method of laying a linear body in a pipeline having an area for intermediate connection, wherein a hollow pipe is simultaneously formed together with the linear body. Laid along,
In the area for intermediate connection, the remaining linear members to be connected to the laid linear members are laid by passing lead wires through hollow pipes laid along the laid linear members. And a method of laying a linear body characterized by the following.

[Action] In this way, since the lead wire for drawing the remaining wire to be connected to the already laid wire is pulled through the hollow pipe, the lead wire comes into contact with the laid wire. Therefore, the laid wire is not damaged by the lead wire.

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 schematically shows a state in which a method for laying a linear body according to the present invention is carried out. In the embodiment shown in the drawing, a wire is linearly connected to a pipe 12 provided below a bridge 30 installed across a river. In the case of laying a body, this conduit may be installed underground. The supply bobbin 10 provided at the point A supplies a linear body to be laid in the pipeline 12. The linear body wound around the supply bobbin 10 is not long corresponding to the distance between A and B but has a length that can be laid at least between BC and CA. As shown in FIGS. 3 (A) to 3 (C), the introduction side manhole 14 provided at the point A is provided with the work of drawing the linear bodies 22 and 22 'from the supply bobbin 10 into the pipeline 12. The supply bobbin 10 is provided for performing an operation of connecting the linear body 22 to another ground cable or device, and is installed close to the introduction side manhole 14.

The winch 16 provided at the point B is for pulling the lead wires for the linear bodies 22 and 22 ′ laid in the pipeline 12 to be pulled out to the point B side. The drawer-side manhole 18 provided at the point B is used for drawing out the linear bodies 22, 22 'to be laid between A and B and connecting the laid linear bodies to another ground cable or equipment. The winch 16 is installed close to the drawer side manhole 18.

An intermediate connection area 20, for example, an intermediate connection manhole is provided at a point C in the middle of the pipeline 12, and the remaining linear member 22 already laid between B and C and the remaining line to be laid between C and A are provided. Linear body
22 'is used to connect later. In the embodiment shown in FIG. 1, only one section 20 for intermediate connection is provided, but several sections may be provided according to the distance between AB. In addition, both ends of the pipeline 12 are underground manholes 14,
Connected to 18.

In the method of the present invention, when the linear body 22 is laid in the pipeline 12, the hollow pipe 24 is drawn into the pipeline 12 simultaneously with the linear body 22, as shown in FIG. The hollow pipe 24 is made of a flexible material such as polyethylene and vinyl, which can be bent to the same degree as the linear body 22.

Next, the state where the linear body 22 and the hollow pipe 24 are drawn into the conduit 12 by the method of the present invention will be described with reference to FIG.
As shown in FIG. 3 (A), a pulley common to a linear body 22 fed from the supply bobbin 10 and a hollow pipe 24 fed from a supply bobbin (not shown) installed close to the supply bobbin 10. A lead wire 28 is attached via an eye 26, and the lead wire 28 is pulled by the winch 16 through the introduction side manhole 14, the pipe 12, the area 20 for intermediate connection, the pipe 12 and the drawer side manhole 18, thereby forming a pipe. Pull into 12.

In this manner, as shown in FIG.
The linear body 22 to be laid between the hollow pipe 24 and the A-
It is set between B and C by passing through the pipe 12 between C and C. Next, as shown in FIG. 3 (C), another supply bobbin 10 for the linear body 22 'is set at point A,
A lead wire 28 'is attached to a linear body 22' drawn out from 10 via a pooling eye 26 '.
8 'on the introduction side manhole 14, pipeline 12, intermediate connection area 2
0, winch 16 through conduit 12 and drawer side manhole 18
The linear body 22 'is laid between A and C by pulling. In this case, it should be noted that lead wire 2
8 'is to be pulled through the pipe 12 between A and C and through the hollow pipe 24 already set between B and C. As a result, the lead wire 28 'is
Therefore, the linear member 22 can be prevented from being rubbed by being directly contacted with it. The linear body 22 laid between B and C and the linear body 22 'laid between A and C are connected in the intermediate connection area 20 provided at the point C, whereby AB is formed. The laying of the linear bodies 22, 22 'in the pipe 12 between them is completed.

The hollow pipe may be laid together with the linear body 22 'laid between A and C. In this way, the hollow pipe 24 is used not only for passing the lead wire 28 'but also for the linear body 22'.
After laying, it can also be used when laying another linear body such as an optical fiber. Note that a plurality of the hollow pipes 24 may be provided.

[Effects of the Invention] According to the present invention, as described above, a lead wire for drawing in a remaining linear body to be connected to a linear body already laid in an area for intermediate connection is replaced with a laid linear body. The lead wire does not come into contact with the laid wire, and therefore the lead wire rubs the laid wire and damages the wire. Nothing.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a state in which the method of the present invention is carried out, FIG. 2 is a cross-sectional view of a pipe in which a linear body is laid by the method of the present invention, and FIGS. It is explanatory drawing which shows the process of the method concerning an invention sequentially. 10 ... supply bobbin, 12 ... conduit, 14 ... introduction side manhole, 16 ... winch, 18 ... drawer side manhole,
20 …… Area for intermediate connection, 22, 22 ′ …… Linear body, 24 ……
Hollow pipe, 26, 26 '... Pulling eye, 28, 28' ...
... lead wires.

Claims (1)

(57) [Claims] 1. A method of laying a linear body in a pipe having an area for intermediate connection, wherein a hollow pipe is laid along the linear body at the same time, and the laying is completed in the area for intermediate connection. The method for laying a linear body, characterized in that the remaining linear body to be connected to the linear body is laid by passing a lead wire through a hollow pipe laid along the laid linear body. .