JP6989874B2 - Towing tool and towing method - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Law Issued January 1, 2018 Publications Electric Site January 2018 Issued by Electrical Information Co., Ltd.

The present invention relates to a traction tool and a traction method for drawing a tube or line into a pipeline in which a cable is laid.

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

In such a pipeline, when the OF cable ignites due to an electric leakage or the like, the resin pipeline itself burns, and the flame diffuses to the outside of the pipeline, which may cause a fire. Therefore, assuming such a situation, it is necessary to take some disaster prevention measures in the pipeline where the cable is laid.

In Patent Document 1, a traction tool connecting a wire rod is inserted into a pipeline in which a cable is laid, and the traction tool is moved by suction or pumping to move the traction tool and insert the wire rod into the pipeline. The construction method is described. This traction tool is configured by providing a plurality of single traction tools including a traction member formed in a parachute shape, a plurality of traction strings provided on the traction member, and a focusing portion in which a plurality of traction strings are focused. Has been done.

In the construction method of Patent Document 1, when the traction tool is inserted into the pipeline and the traction tool is sucked or pumped by a suction device or a blower, the traction tool receives the airflow flowing in the upper wide space in the pipeline. It is said that the wire can be inserted into the pipeline by moving the wire.

Japanese Patent Application Laid-Open No. 2003-244813

As a disaster prevention measure, the present inventors have come up with the idea of drawing a fire extinguishing tube into which a fire extinguishing agent can be press-fitted into the gap between the pipeline and the cable over the entire area of the pipeline. By doing so, in a situation where the OF cable ignites, the fire extinguishing tube is torn by the heat of the ignition site, and the fire extinguishing agent is sprayed onto the ignition site, so that the fire can be extinguished.

In order to realize this disaster prevention measure, it is conceivable to apply the construction method described in Patent Document 1 to pull the fire extinguishing tube into the pipeline. However, as verified by the present inventors, in the parachute-shaped traction member, the wind escapes to the side of the parachute, the wind cannot be sufficiently received, and it is difficult for the traction tool to sufficiently move in the pipeline. Met.

In view of such problems, it is an object of the present invention to provide a traction tool and a traction method capable of reliably drawing a fire extinguishing tube into a pipeline in which a cable is laid.

In order to solve the above problems, a typical configuration of the traction tool according to the present invention is a traction tool that draws a tube or a line into a pipeline in which a cable is laid, and has a spindle shape in which a large number of fibers are bundled. It is characterized by having a bunch of.

In the above configuration, the traction tool is provided with a spindle-shaped tuft in which a large number of fibers are bundled. Therefore, when a traction tool is inserted into the gap between the pipeline where the cable is laid and the cable, and air is pumped into the pipeline, the traction tool is a spindle-shaped tuft that is inflated by bundling a large number of fibers. Therefore, you can ride the wind well and move reliably in the pipeline.

Therefore, by attaching the tube or line to the traction tool and moving it in the pipeline, the tube or line 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, it is possible to draw a fire extinguishing tube filled with a digestive agent into the pipeline. By doing so, in a situation where the OF cable ignites due to an electric leakage or the like, the fire extinguishing tube is torn by heat in the pipeline and the extinguishing agent is sprayed onto the ignition site, so that the fire can be extinguished.

The above traction tool may be provided with a plurality of tufts. Here, the cross-sectional shapes of the pipeline and the cable are substantially circular. Therefore, when the cable is laid in the pipeline, the shape of the gap between the cable and the pipeline is a crescent shape. In the above configuration, since the towing tool is provided with a plurality of tufts of fibers, it is possible to close the crescent-shaped gap and receive wind pressure well.

The traction tool may include a head portion that bundles the tips of a plurality of tufts into one. In this way, since the tips of the plurality of tufts are bundled together by the head portion, it is possible to prevent the tufts from being caught in the gap between the cable and the pipeline. The head portion may be, for example, a resin cover.

The traction tool may include a rigid shaft surrounded by a bundle of fibers. In this way, the traction tool is not only a bundle of fibers, but also has a tuft of fibers surrounding a rigid shaft, so that the spindle shape can be reliably maintained. Therefore, when the traction tool receives wind in the gap between the pipeline and the cable, it can move reliably in the gap while maintaining the spindle shape, so that it is not bent and pinched in the narrow part of the gap, for example.

In order to solve the above problems, a typical configuration of the traction method according to the present invention is a traction method in which a tube or a line is drawn into a pipeline in which a cable is laid by using the above-mentioned traction tool. A tube or line longer than the total length of the pipeline is attached to a spindle-shaped tuft in which a large number of fibers are bundled, and the tuft is pushed into the gap between the pipeline and the cable from one end of the pipeline to pump air into the gap. It is characterized in that the tufts are moved to the other end of the conduit and the tufts are collected while maintaining the tension of the tube or line.

The components corresponding to the above-mentioned technical idea of the traction tool and its description thereof can also be applied to the method. That is, with the tube or line attached to the spindle-shaped tuft (traction tool), the tuft is pushed from one end of the conduit into the gap between the conduit and the cable, and air is further pumped. In this way, the spindle-shaped tufts receive the wind well and move in the gap. The gap between the pipeline and the cable is crescent-shaped.

In addition, the speed of movement of the tuft can be adjusted by keeping the tension of the tube or line so that it does not loosen as the tuft moves through the gap. For example, if the moving speed of the tufts is too fast, the tufts will rush into the narrow part of the crescent-shaped gap and cannot move. However, by adjusting the moving speed of the tuft, the tuft is attracted to the wide part of the crescent-shaped gap (that is, the part where the wind speed is high and the pressure is low), and the tuft can be reliably moved in the gap.

The tube or line can then be drawn into the pipeline by collecting the tufts that have reached the other end of the pipeline. Here, if a line (string) is attached to the tuft instead of the tube, the line is pulled into the pipeline, the tube is connected to the line, and the line is collected to collect the line. The tube can be pulled in.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a traction tool and a traction method capable of reliably drawing a fire extinguishing tube into a pipeline in which a cable is laid.

It is a figure which shows the pipeline to which the traction tool in an embodiment of this invention is applied. It is a figure explaining the traction tool in embodiment of this invention. It is a figure which shows the procedure which pushes a traction tool into a pipeline. It is a figure which shows the state of the traction tool which moves in a pipeline. It is a figure which shows the other state of the traction tool moving 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 the embodiment are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and the drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate explanations, and elements not directly related to the present invention are not shown. do.

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

Under the bridge 100 shown in FIG. 1 (a), a pipeline 102 is installed over a long distance of, for example, several hundred meters. The pipeline 102 is made of a resin such as FRP, and a high-voltage electric wire (OF cable 104) or the like is laid inside the pipeline 102. Such a pipeline may be installed not only under the bridge 100 but also in the ground. In such a pipeline 102, when the OF cable 104 ignites due to an electric leakage or the like, the resin pipeline 102 itself burns, the flame spreads to the outside of the pipeline 102, and finally a fire occurs. There can be.

Therefore, in the present embodiment, a disaster prevention measure is adopted in which the fire extinguishing tube 110 shown by the broken line in FIG. 1A is pulled into the pipeline 102 by using the traction tools 106 and 108 (see FIG. 2). Here, the inside of the pipeline 102 is a gap 112 between the pipeline 102 and the OF cable 104 shown in FIG. 1 (b), and the shape thereof is such that the cross-sectional shapes of the pipeline 102 and the OF cable 104 are substantially circular. Therefore, it has a crescent shape.

The fire extinguishing tube 110 is drawn into a pipe line 102 located between the manholes 114 and 116. Both ends of the fire extinguishing tube 110 are connected to the fire extinguishing pumps 118 and 120 arranged in the manholes 114 and 116. A digestive agent is supplied under pressure from the fire extinguishing pumps 118 and 120 to the fire extinguishing tube 110.

By doing so, in a situation where the OF cable 104 ignites, the fire extinguishing tube 110 is torn by the heat of the ignition portion, so that the extinguishing agent is sprayed to the ignition portion and the fire can be extinguished.

FIG. 2 is a diagram illustrating the traction tools 106 and 108 according to the embodiment of the present invention. The traction tools 106 and 108 are used when the fire extinguishing tube 110 is pulled into the pipeline 102 in which the OF cable 104 is laid, that is, in the gap 112.

The towing tool 106 shown in FIG. 2A includes a plurality of (here, three) tufts 122. The tuft 122 has a spindle shape by bundling a large number of fibers, and further surrounds a rigid shaft 124 with a bundle of fibers. As an example, a PE string with a length of 1000 mm (3 twists, 8 mm diameter, bulk density: 0.2 g / cm ³ ) is prepared as an example of the fiber bundle, and after untwisting the twist, multiple fibers are folded in half. The combined product is a bundle. Therefore, the total length of the fiber bundle is about 500 mm. Further, the shaft 124, which is more rigid than the bundle of fibers, uses a vinyl chloride rod having a diameter of 3 mm, but is not limited thereto.

Since the fibers of the tuft 122 are swelled by untwisting the PE string, the spindle shape is easily formed, and the rigid shaft 124 is surrounded by a bundle of fibers, so that the spindle shape can be reliably maintained.

A line (string 130) is attached to the rear end 126 of the tuft 122 via the connecting portion 128. The material of the string 130 may be a material such as polyethylene, which is light and has a small coefficient of friction between the pipeline 102 and the OF cable 104. As the string 130, for example, a rope for holding a boat may be used.

The towing tool 108 shown in FIG. 2 (b) is a modification of the towing tool 106 shown in FIG. 2 (a) in that it includes a head portion 132 that bundles the tips of the tufts 122 into one. The head portion 132 has a flat shape as shown in FIG. 2 (c), and here, the tips 134 (see FIG. 2 (b)) of the three tufts 122 are fixed in a row. The head portion 132 can be configured by, for example, sandwiching the tip of the tuft 122 with two resin films.

FIG. 3 is a diagram showing a procedure for pushing the traction tool 106 into the pipeline 102. FIG. 3A is a side view showing a pipe mouthpiece 138 attached to one end 136 of the pipe line 102. FIG. 3B is an exploded perspective view of the pipe mouthpiece 138 of FIG. 3A, showing a state in which the traction tool 106 is pushed into the gap 112 between the pipe line 102 and the OF cable 104.

As shown in FIG. 3A, the pipe mouthpiece 138 includes a housing 140, an air duct 142, and a guide pipe 144. As shown in FIG. 3B, the housing 140 can be separated into a lower portion 146 and an upper portion 148, and by assembling these, a tubular shape surrounding the OF cable 104 is formed.

The air duct 142 is provided in the upper portion 148, and introduces air pumped from a compressor (not shown) into the inside of the housing 140. The guide pipe 144 is provided in the upper portion 148 and projects rearward. Further, the guide pipe 144 communicates with the inside of the housing 140, and the string 130 for attaching to the traction tool 106 can be inserted from the outside to the inside of the housing 140. The string 130 is longer than the total length of the pipeline 102 located between the manholes 114 and 116 shown in FIG.

A procedure for pushing the traction tool 106 into the pipe line 102 by using such a pipe mouthpiece 138 will be described. The procedure shown below is the same when the towing tool 108 with the head portion 132 is pushed into the pipeline 102 instead of the towing tool 106.

Here, the string 130 is passed through the guide pipe 144 of the pipe mouthpiece 138, and the string 130 is pulled from the outside to the inside of the housing 140. Then, the string 130 passed through the guide pipe 144 is attached to the connecting portion 128 of the rear end 126 of the tuft 122. Next, the towing tool 106 to which the string 130 is attached is pushed from one end 136 of the pipeline 102 into the gap 112 between the pipeline 102 and the OF cable 104.

Subsequently, the lower portion 146 of the housing 140 is arranged along the lower side of the OF cable 104. Then, the upper portion 148 of the housing 140 is arranged so as to overlap the lower portion 146 from the upper side of the OF cable 104, and is assembled to the lower portion 146 using bolts or the like. Further, the lower portion 146 and the upper portion 148 of the housing 140 are assembled to one end 136 of the pipeline 102 by using bolts or the like to ensure airtightness.

After that, a compressor (not shown) is driven to pump air into the housing 140 via the air duct 142. As a result, the traction tool 106 receives the pumped air and moves in the gap 112 (see FIG. 4).

FIG. 4 is a diagram showing a state of the traction tool 106 moving in the pipeline 102. FIG. 4A is a diagram showing the inside of the pipeline 102. 4 (b) is a cross-sectional view taken along the line BB of FIG. 4 (a).

The traction tool 106 includes a spindle-shaped tuft 122 that is inflated by bundling a large number of fibers. Therefore, when the traction tool 106 is pushed into the gap 112 between the pipeline 102 and the OF cable 104 and receives the pumped air (see arrow C) as shown in FIG. 4A, it receives the wind well. It can move reliably in the pipeline 102.

Further, since the traction tool 106 is provided with a plurality of spindle-shaped tufts 122 (here, three), the crescent-shaped gap 112 can be closed and wind pressure can be well received as shown in FIG. 4 (b).

Here, when the towing tool 106 moves in the gap 112, the operator moves the towing tool 106 while maintaining tension so that the string 130 does not loosen. In this way, the moving speed can be adjusted by moving the towing tool 106 while maintaining the tension of the string 130.

As an example, if the moving speed of the traction tool 106 is too fast, the tuft 122 may rush into the narrow portion 150 of the crescent-shaped gap 112 and cannot move. On the other hand, by adjusting the moving speed of the traction tool 106, the tuft 122 is attracted to the wide portion 152 (that is, the portion where the wind speed is high and the pressure is low) in the crescent-shaped gap 112. As a result, the towing tool 106 can be reliably moved in the gap 112. That is, it is more appropriate to express that the towing tool 106 moves on the air flow rather than moving under the wind pressure.

Further, since the tuft 122 is formed not only by bundling the fibers but also by surrounding the rigid shaft 124 with the bundle of fibers, the spindle shape can be reliably maintained. Therefore, when the tuft 122 receives wind in the gap 112, it can move reliably in the gap 112 while maintaining the spindle shape without being bent, for example, and being pinched by the narrow portion 150 of the gap 112.

When the towing tool 106 is moved in the gap 112 in this way and the towing tool 106 reaches the other end of the pipeline 102 facing the manhole 120 in FIG. 1, the operator can see the towing tool 106 to which the string 130 is attached. To collect. As a result, the string 130 can be pulled into the pipeline 102.

Then, the worker can pull the fire extinguishing tube 110 into the pipe line 102 by pulling the string 130 into the pipe line 102, connecting the fire extinguishing tube 110 to the string 130, and collecting the string 130. ..

FIG. 5 is a diagram showing another state of the traction tool 106 moving in the pipeline 102. Here, the case where the OF cable 104A laid in the pipeline 102 is winding due to aged deterioration, temperature change, or the like is illustrated.

In the pipeline 102 shown in FIG. 5, since the shape of the gap 112A is not constant, the flow of air pumped into the gap 112A is also not constant as shown by the arrow D in the figure. Even in such a case, the operator may move the towing tool 106 while maintaining the tension of the string 130 and adjusting the moving speed of the towing tool 106. In this way, the tuft 122 is attracted to the portion of the gap 112A where the wind speed is high and the pressure is low. Therefore, the towing tool 106 can surely move in the gap 112A as shown in the figure.

When the towing tool 108 with the head portion 132 (see FIGS. 2B and 2C) moves in place of the towing tool 106 in the gaps 112 and 112A in the pipeline 102 shown in FIGS. 4 and 5. In the traction tool 108, since the tips 134 of the three tufts 122 are bundled together by the head portion 132, it is possible to more reliably prevent the tufts 122 from being pinched in the gaps 112 and 112A. In particular, since the tips of the tufts 122 are fixed in a row by the flat head portion 132, it is possible to pass through the gap even when the OF cable 104 is undulating.

As described above, by using the traction tools 106 and 108 in the present embodiment, the string 130 and the fire extinguishing tube 110 can be reliably pulled into the pipeline 102 in which the OF cable 104 is laid. Fire protection measures 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 clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, which naturally belong to the technical scope of the present invention. Understood.

The present invention can be used as a traction tool and a traction method for drawing a tube or line into a pipeline in which a cable is laid.

100 ... bridge, 102 ... pipeline, 104, 104A ... OF cable, 106, 108 ... traction tool, 110 ... fire extinguishing tube, 112, 112A ... gap, 114, 116 ... manhole, 118, 120 ... fire extinguishing pump, 122 ... bunch , 124 ... shaft, 126 ... rear end of tuft, 128 ... connecting part, 130 ... string, 132 ... head part, 134 ... tip of tuft, 136 ... end of pipe, 138 ... pipe mouthpiece, 140 ... housing, 142 ... Air duct, 144 ... Guide pipe, 146 ... Lower part of housing, 148 ... Upper part of housing, 150 ... Wide gap, 152 ... Narrow gap

Claims (4)

A traction tool that pulls a tube or line into a pipeline in which a cable is laid.
Equipped with multiple spindle-shaped tufts of many fibers bundled together ,
Further, the traction tool is provided with a flat head portion for fixing the tips of the plurality of spindle-shaped tufts in a row . The traction tool according to claim 1, wherein the head portion is a resin cover. The towing tool according to claim 1 or 2 , wherein the towing tool includes a rigid shaft surrounded by a bundle of fibers. A traction method for pulling a tube or line into a pipeline in which a cable is laid by using the traction tool according to any one of claims 1 to 3 .
A tube or line longer than the total length of the pipeline is attached to a spindle-shaped tuft of many fibers.
The tuft is pushed into the gap between the pipeline and the cable from one end of the pipeline, and air is pumped into the gap.
A traction method comprising moving the tuft to the other end of the conduit and collecting the tuft while maintaining the tension of the tube or line.

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