JP7231385B2 - Traction tool - Google Patents

Description

The present invention relates to a traction device for pulling a tube or line into a cable-laid conduit.

Under a bridge over a river or the like, a pipeline is installed over a long distance of, for example, several hundred meters. The conduit is made of resin such as FRP (Fiber-Reinforced Plastics), and an OF (Oil Filled) cable such as a high-voltage electric wire is laid inside.

In such a pipeline, if the OF cable ignites due to an electric leak or the like, the pipeline itself, which is made of resin, will burn, and the flame will spread to the outside of the pipeline, possibly causing a fire. Therefore, in anticipation of such a situation, it is necessary to take some kind of disaster prevention measures in conduits in which cables are laid.

Patent Literature 1 describes a rod insertion jig. The rod insertion jig is attached to the tip of a rod that is inserted into a cable entry conduit in which a cable wire has already been inserted, and has a plate-like guide. The guide has an arcuate peripheral edge in the plate thickness direction, and has three cross-sectional shapes: one point on the plate surface that contacts the cable wire, and two points on the peripheral edge that can contact the inner wall of the pipe. It is a shape that enables point contact state by

In Patent Document 1, since the guide has a shape that enables a point-contact state with three points, in a relatively large central space region of the crescent-shaped space formed between the cable wire and the inner wall of the conduit, A stable contact state is achieved, and sinking into narrow space areas on the left and right of the central space area can be avoided. Further, in Patent Document 1, it is possible to reduce the frictional resistance with the inner wall of the pipeline and the cable line by the point contact by the guide, so that the rod can be advanced smoothly.

JP-A-2001-251721

The present inventors came up with the idea of drawing a fire-extinguishing tube capable of pressurizing a fire-extinguishing agent into the gap between the conduit and the cable over the entire area of the conduit as a disaster prevention measure. In this way, when the OF cable ignites, the fire extinguishing tube is torn by the heat of the ignited portion, and the fire extinguishing agent is sprayed to the ignited portion to extinguish the fire.

In order to realize this disaster prevention measure, it is conceivable to apply the rod insertion jig provided with the guide described in Patent Document 1 to draw the fire extinguishing tube into the pipeline. However, since it is necessary to form the peripheral portion in a circular arc shape in the plate thickness direction and form a cross-sectional shape that enables a point contact state with three points, high processing accuracy is required for the guide. Furthermore, in order to always maintain the three-point contact of the guide, it is necessary to set the shape of the guide each time, considering the shape and size of the gap between the conduit and the cable.

In view of such problems, it is an object of the present invention to provide a towing tool that has a simple structure and can reliably pull a fire extinguishing tube into a pipeline in which a cable is laid.

In order to solve the above problems, a typical construction of the traction tool according to the present invention is a traction tool for pulling a tube or line into a pipeline in which a cable is laid, comprising a belt-shaped body and a longitudinal direction of the belt-shaped body and wire rods attached to both edges of the .

In the traction device configured as described above, wire-passing rods are attached to both longitudinal edges of the belt-shaped body. In other words, the traction tool has a structure in which two wire rods are connected by a belt-like body. The length of the width of the belt-like body is appropriately set according to the inner diameter of the conduit and the size of the gap between the conduit and the cable. Therefore, when the traction tool is inserted into the gap between the cable and the pipeline in which the cable is laid, the traction tool is placed on the cable. Here, the cross-sectional shape of the conduits and cables is substantially circular. Therefore, in the pipeline in which the cable is laid, the shape of the gap between the cable and the pipeline becomes a crescent shape.

In other words, when the traction tool is placed on the cable, it does not sink into the narrow portion of the crescent-shaped gap. Therefore, for example, the belt-like body is made of a woven fabric like a fire hose coated with an elastic resin such as elastomer or rubber. Pushing the puller inside ensures that the puller can move through the conduit while remaining on the cable.

Therefore, by inserting the traction tool into the pipeline, attaching a messenger rope (string) or the like to the end thereof, and pulling out the traction tool from the pipeline, the string can be reliably pulled into the pipeline. Here, as an example, when the pipeline is an FRP pipe and the cable is an OF cable such as an electric wire, the operator draws a string into the pipeline, ties a fire tube to the string, and collects the string. This allows the fire-extinguishing tube to be drawn into the pipeline. In this way, in a situation where the OF cable catches fire due to an electric leak or the like, the fire extinguishing tube is torn by the heat in the pipeline, and the fire extinguishing agent is sprayed to the ignited part, so that the fire can be extinguished. As described above, according to the towing tool having the above structure, the fire-extinguishing tube can be drawn into the pipeline in which the cable is laid with a simple structure in which the wire-connecting rods are attached to both longitudinal edges of the strip.

ADVANTAGE OF THE INVENTION According to this invention, it is a simple structure and can provide the traction tool which can pull a fire-extinguishing tube into the pipeline with which the cable was laid reliably.

FIG. 4 is a diagram showing a pipeline to which a traction device is applied in an embodiment of the present invention; It is a figure explaining the traction tool in embodiment of this invention. It is a figure which shows the state of the traction tool which moves in a pipeline.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

FIG. 1 is a diagram showing a pipeline to which a traction tool is applied according to an embodiment of the present invention. FIG. 1(a) is a diagram showing a pipeline 102 installed under a bridge 100. FIG. FIG. 1(b) is a cross-sectional view of the pipeline 102 of FIG. 1(a) taken along the line AA. As shown in FIG. 1(b), a plurality of pipelines 102 are installed under the bridge 100, but one pipeline 102 is representatively shown in FIG. 1(a).

Under the bridge 100 shown in FIG. 1A, a pipeline 102 is installed over a long distance of, for example, several hundred meters. The pipeline 102 is made of resin such as FRP, and a high-voltage electric wire (OF cable 104) and the like are laid inside. Such pipelines may be installed not only under the bridge 100 but also underground. In such a conduit 102, if the OF cable 104 catches fire due to an electric leak or the like, the conduit 102 itself, which is made of resin, will burn, the flame will spread to the outside of the conduit 102, and finally a fire will occur. can be.

Therefore, in this embodiment, a disaster prevention measure is adopted in which a fire extinguishing tube 110 indicated by a dashed line in FIG. Here, the inside of the conduit 102 is the gap 112 between the conduit 102 and the OF cable 104 shown in FIG. Therefore, it has a crescent shape.

A fire suppression tube 110 is drawn into the conduit 102 located between the manholes 114,116. Both ends of the fire-extinguishing tube 110 are also connected to fire-extinguishing pumps 118, 120 located in manholes 114, 116, respectively. Fire extinguisher is supplied under pressure from fire pumps 118 and 120 to fire tube 110 .

In this way, in a situation where the OF cable 104 catches fire, the fire extinguishing agent is sprayed to the ignition site by breaking the fire extinguishing tube 110 due to the heat of the ignition site, so that the fire can be extinguished.

FIG. 2 is a diagram illustrating a traction tool 200 according to an embodiment of the invention. The traction tool 200 is used to pull the fire extinguishing tube 110 into the conduit 102 in which the OF cable 104 is laid, that is, into the gap 112 .

The traction tool 200 includes a band 202 and two wire rods 204 and 206 . The belt-shaped body 202 is made of a flexible material, such as a fire hose, but somewhat rigid. The material of the band-shaped body 202 is not limited to this, and the material of the band-shaped body 202 may be a woven cloth such as a fire hose coated with an elastic resin such as elastomer or rubber. The strip 202 has an overall length L longer than that of the pipeline 102 and a width W appropriately set according to the inner diameter of the pipeline 102 and the size of the gap 112 .

Wire-passing rods 204 , 206 are made of FRP, for example, and are attached to both longitudinal edges 208 , 210 of the strip 202 . Both edges 208 and 210 of the strip 202 are connected by a body portion 212 . Thus, the traction tool 200 has a structure in which the two wire-connecting rods 204 and 206 are connected by the belt-like body 202 .

Both edges 208 and 210 of the band-shaped body 202 are folded back in the width direction so as to wrap the wire rods 204 and 206 as shown, and the ends 214 and 216 are sewn and fused to the body portion 212 . Since the wire rods 204, 206 are attached to both edges 208, 210 of the strip 202 in this way, they will not be twisted even if they are pushed into the gap 112 of the pipeline 102 (see FIG. 3). An end 218 of the body portion 212 is provided with an attachment portion 220 that is eye-shaped and to which a messenger rope (string) or the like can be attached.

FIG. 3 is a diagram showing the state of the traction tool 200 moving inside the conduit 102. As shown in FIG. FIG. 3A is a diagram showing the inside of the pipeline 102, and is a schematic diagram showing the state of the pipeline 102 viewed from above. FIG. 3(b) is a BB cross-sectional view of the pipeline 102 of FIG. 3(a).

A pushing device 224 shown in FIG. The pushing device 224 is a device for pushing the traction device 200 into the conduit 102 and has a support base 226 and a ball roller 228 supported by the support base 226 . The ball rollers 228 have a structure like a pair of tires and are driven by a motor (not shown) to push the traction tool 200 into the gap 112 in the pipeline 102 while sandwiching the traction tool 200 from above and below. The traction device 200 is wound and stored on a drum (not shown), and is moved within the gap 112 toward the other end 230 of the pipeline 102 by the pushing device 224 as indicated by the arrow C in the figure.

Here, since the gap 112 between the conduit 102 and the cable 104 has a crescent shape, the gap 112 has a wide portion 232 and narrow portions positioned on both sides of the wide portion 232 in the width direction as shown in FIG. and portions 234,236.

The traction device 200 has wire-connecting rods 204 and 206 attached to both longitudinal edges 208 and 210 of a belt-like body 202, and has a structure in which the two wire-connecting rods 204 and 206 are connected by the belt-like body 202 as described above. It has become.

For this reason, when the traction tool 200 is pushed into the gap 112 between the conduit 102 and the OF cable 104, the traction tool 200 rides over the cable 104 as shown in FIG. 3(b). In addition, since the belt-shaped body 202 is a rigid material to some extent, the dimension in the width direction is difficult to change. As a result, the traction tool 200 does not slip off the wide portion 232 of the gap 112 while riding on the cable 104 . Furthermore, in the traction device 200, the inner diameter of the conduit 102 and the size of the gap 112 are adjusted so that the edges 208, 210 of the strip 202 do not enter the narrow portions 234, 236 of the gap 112 while riding on the cable 104. The length W (see FIG. 2) of the width of the strip 202 is set according to .

In other words, when the traction tool 200 is on the cable 104 , it does not sink into the narrow portions 234 and 236 of the crescent shaped gap 112 . Therefore, when the strip 202 is pushed into the pipeline 102 by the pushing device 224, the traction tool 200 can be reliably moved within the gap 112 of the pipeline 102 while remaining on the cable 104. can.

Since the total length L of the strip 202 is longer than the total length of the pipeline 102, the traction tool 200 moves in the gap 112 and the other end 230 of the pipeline 102 facing the manhole 120 in FIG. a) see) can be reached.

When the retractor 200 reaches the other end 230 of the conduit 102 , the attachment portion 220 attached to the distal end 218 of the strip 202 will be located near one end 222 of the conduit 102 . Therefore, the operator can reliably pull the string into the pipeline 102 by attaching a string to the attachment portion 220 of the strip 202 and pulling out the traction tool 200 from the other end 230 of the pipeline 102 .

Further, the operator can draw the fire-extinguishing tube 110 into the pipeline 102 by pulling the string into the pipeline 102, tying the fire-extinguishing tube 110 to the string, and retrieving the string.

As described above, according to the traction tool 200 of the present embodiment, the OF cable 104 has a simple configuration in which the wire-connecting rods 204 and 206 are attached to both longitudinal edges 208 and 210 of the band-shaped body 202 . The string and also the fire-extinguishing tube 110 can be reliably drawn into the constructed pipeline 102, and the fire prevention measures described above can be realized.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present invention. Understood.

INDUSTRIAL APPLICABILITY The present invention can be used as a tow tool for pulling tubes or lines into cable-laid conduits.

DESCRIPTION OF SYMBOLS 100... Bridge, 102... Pipe line, 104... OF cable, 110... Fire-extinguishing tube, 112... Gap, 114, 116... Manhole, 118, 120... Fire-extinguishing pump, 200... Traction tool, 202... Belt-shaped body, 204, 206... Wire passing rod 208, 210 Both edges of strip 212 Main body 214, 216 End of both edges 218 End of main body 220 Mounting part 222 One end of pipeline 224 Push Apparatus 226 Support base 228 Ball roller 230 Other end of pipeline 232 Wide gap portion 234, 236 Narrow gap portion

Claims (1)

A towing device for drawing a tube or line into a cable-laid conduit,
comprising a belt-shaped body and wire-connecting rods attached to both longitudinal edges of the belt-shaped body ,
The overall length of the strip is set longer than the overall length of the pipeline,
The belt-shaped body is formed of a rigid material having flexibility,
A traction tool characterized by having an attachment portion to which a tube or a line can be attached at the end of the band-shaped body .

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