JP7154793B2 - Hose reversing device, hose reversing construction method and hose used for this - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hose reversing device for inserting a hose into a pipe, a hose reversing construction method, and a hose used therein.

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 pneumatic pipe entry apparatus that uses compressed air to turn a long synthetic resin cylindrical tube inside a pipe while turning it inside out (inverting). This device has a container, an inlet for introducing compressed air from a compressed air generator into the container, and a cylindrical discharge port for discharging a tube.

The tubes are folded and stacked in a container. The tip of the tube is led out of the container through the discharge port, turned upside down, covered with the outer periphery of the discharge port, and airtightly fixed with a fixture. In Patent Document 1, when the discharge port of the container faces the opening of the pipeline and compressed air is introduced into the container from the inlet, the air pushes the tip of the tube turned upside down, causing it to enter the pipeline. It is said that it will enter.

Japanese Patent Laid-Open No. 2002-200002 describes a film delivery device that allows a tubular film to enter a tube while being turned inside out. This device is a closed box-shaped container, and is provided with a compressed air inlet and a film outlet. The film is wound around a support shaft provided in the device and rotatably suspended and held in the device. The leading end of the film is pulled out from the film lead-out portion, turned inside out, and air-tightly fixed to the film lead-out portion.

According to Patent Document 2, when compressed air is sent into the device from the compressed air introduction portion, the leading end of the film turned upside down is pushed by the air and enters the pipeline.

JP-A-64-34114 JP-A-63-299703

In order to implement the above fire prevention measures, it is conceivable to draw a fire-extinguishing tube into the pipeline located between the two manholes. If the techniques described in Patent Documents 1 and 2 are applied, the tube or film is turned over and entered into the pipe from one end of the pipe, and after reaching the other end of the pipe, the fire extinguishing tube is placed at the rear end of the tube or film. It is envisioned that the fire-extinguishing tube is pulled into the pipeline by tying it together and pulling out the tube or film.

However, the containers of Patent Literatures 1 and 2 are required to fold and stack the tubes and install them inside, or to accommodate the film wound around the support shaft provided in the container, so the size is large. It gets bigger. Therefore, it is difficult to install the container of Patent Documents 1 and 2 in a narrow space such as a manhole provided between conduits where cables are laid, and it is difficult to realize the above disaster prevention measures.

Furthermore, if the tube or film as described in Patent Documents 1 and 2 is applied to a long-distance pipeline of several hundred meters, it will burst because it cannot withstand the pressure required to turn it inside out. Therefore, it is conceivable to apply a hose used in the field of firefighting or the like, which has a higher pressure resistance than a tube or film. The hose is made by integrally forming an airtight coating layer on the outer surface of a pressure-resistant tubular woven fabric. requires high pressure. As a result, there is a risk that the high pressure hose will deform the pipeline.

In view of these problems, the present invention provides a hose reversing device that can be installed in a narrow space such as a manhole and that can reliably insert a hose into a pipe, and a pipe line deformation that occurs due to the pressure of the hose reversal. The purpose of the present invention is to provide a hose reversal construction method that does not require a hose and a hose used for this method.

In order to solve the above problems, a typical configuration of the hose reversing device according to the present invention is a hose reversing device that uses pressure fluid to reverse a hose and enter a gap in a pipe, wherein the pressure fluid is introduced. an injection port provided at the tip of the pressure vessel for injecting while reversing the hose; an inlet provided at the rear end of the pressure vessel for drawing in the hose from outside the vessel; and an inlet provided inside the pressure vessel. and a feeding mechanism for feeding the hose pulled in from the nozzle toward the injection port.

According to the above configuration, first, a hose is drawn into the pressure vessel from the outside through the introduction port at the rear end. Next, the drawn hose receives pressure from the compressed air and enters the pipe while being reversed at the injection port at the tip of the pressure vessel. Since the hose is pulled in from outside the vessel, it does not have to be housed inside the pressure vessel beforehand. Therefore, according to the hose reversing device, the pressure vessel can be made smaller and can be installed in a narrow space such as a manhole.

As an example, when taking fire prevention measures, install a hose reversing device in the manhole at one end of the pipeline, prepare a hose of approximately the same length as the pipeline, and attach a fire extinguishing tube to the rear end of the hose. In this state, the hose is pulled into the pressure vessel from the outside of the vessel and turned upside down to enter from one end of the pipeline to the other. Then, when the rear end of the hose reaches the manhole on the other end side of the pipeline, the fire-extinguishing tube can be reliably drawn into the pipeline.

In particular, the inside of the pressure vessel has a feeding mechanism for feeding the hose drawn from the introduction port toward the injection port. Here, it is preferable to provide a lubricant inlet to be applied to the outer surface of the hose before reversal between the feeding mechanism and the injection port. A packing such as a rubber plate is provided at the introduction port of the pressure vessel in order to maintain airtightness while drawing the hose from the outside of the vessel. The packing is pressed against the hose by pressure to feed the hose out of the injection port. Therefore, at the inlet, resistance is generated between the packing and the hose.

On the other hand, in the above configuration, the resistance of the introduction port can be reduced or offset by sending out the drawn-in hose from the introduction port toward the ejection port by the feed mechanism. Therefore, even if resistance occurs at the introduction port, the hose is not prevented from reversing at the injection port.

In order to solve the above problems, a representative configuration of the hose reversing method according to the present invention includes a pressure vessel into which pressure fluid is introduced, an injection port provided at the tip of the pressure vessel and injecting while reversing the hose, Using a hose reversing device having an introduction port provided at the rear end of the pressure vessel for drawing in the hose from outside the container, and a feeding mechanism for feeding the hose drawn from the introduction port toward the injection port, It is characterized in that the hose is reversed and entered into the gap in the pipe from the injection port by using the pressure fluid while pulling the hose.

The constituent elements corresponding to the technical concept of the hose reversing device described above and their descriptions are also applicable to the hose reversing construction method. That is, the pressure vessel can be downsized and installed in a narrow space such as a manhole because the hose is drawn from the outside of the vessel. By using a hose reversing device installed in the manhole, the hose pulled in from the introduction port is reversed at the injection port, and the hose is sent out toward the injection port by the feed mechanism, so that reversal can be performed smoothly. Since the reversing pressure can be kept low, it is possible to ensure that the hose enters from one end of the pipeline to the other end, and that the pressure of reversing the hose does not cause deformation of the pipeline.

In the above-mentioned hose reversing method, it is preferable that the hose before being reversed is allowed to enter the gap in the pipe while being reversed, with the oil-based lubricant adhered to the outer surface and the water-based lubricant adhered to the inner surface. As a result, the reversal can be smoothly performed, and the reversal pressure can be kept low.

In order to solve the above problems, a typical configuration of a hose for a hose reversing construction method according to the present invention is a hose that enters a gap in a pipeline while reversing using a pressure fluid, The diameter of the hose is characterized by being smaller than the maximum width of the gap in the pipeline.

As a result, the diameter of the hose does not become larger than the gap in the pipe when it is reversed, and the hose in contact with the cable is less likely to come into contact with the inner surface of the pipe. Therefore, it is possible to reliably enter the pipeline without deforming the pipeline due to the reversing pressure.

According to the present invention, a hose reversing device that can be installed in a narrow space such as a manhole and can reliably enter a hose into a pipe; A hose can be provided for this purpose.

It is a figure which shows the pipeline which applies the hose inversion apparatus in embodiment of this invention. It is a sectional view showing the inside of the hose reversing device in the embodiment of the present invention. It is a figure explaining the hose used for a hose reversing device. FIG. 11 shows the rear end of the pressure vessel of the hose inverter. It is a figure explaining the reversing insertion process by a hose reversing device. FIG. 6 is a diagram for explaining a reversing insertion process subsequent to FIG. 5; FIG. 7 is a diagram for explaining a tube drawing-in process subsequent to FIG. 6; It is a figure explaining the diameter of a hose.

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 hose reversing device according to an embodiment of the invention is applied. 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. Note that the pipeline 102 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 108 indicated by a broken line in FIG. Here, the inside of the conduit 102 is the gap 110 between the conduit 102 and the OF cable 104 shown in FIG. Therefore, it has a crescent shape, and the maximum width of this gap 110 is indicated as Lb.

A fire suppression tube 108 is pulled into the conduit 102 located between the manholes 112, 114 using a hose inverter 106 (discussed below). Both ends of the fire-fighting tube 108 are connected to fire-fighting pumps 116, 118 located within manholes 112, 114, respectively. Fire extinguishing agent is supplied under pressure from fire pumps 116 and 118 to fire tube 108 .

In this way, when the OF cable 104 ignites, the fire extinguishing agent is sprayed to the ignited portion by breaking the fire extinguishing tube 108 due to the heat of the ignited portion, thereby extinguishing the fire. It should be noted that the fire-extinguishing tube 108 is preferably a hard resin tube that is lightweight and strong enough to withstand the internal pressure for injecting the fire-extinguishing agent and the external pressure during reversal.

FIG. 2 is a cross-sectional view showing the interior of the hose reversing device 106 according to the embodiment of the invention. FIG. 3 is a diagram illustrating the hose 120 used in the hose reversing device 106. As shown in FIG. FIG. 3(a) is a perspective view showing the hose 120 before reversing. FIG. 3(b) is a diagram showing a portion of the hose reversing device 106 and the hose 120. FIG.

The hose reversing device 106 is a device that implements a so-called hose lining construction method in which the hose 120 is reversed and entered into the pipeline 102 (see FIG. 1) using compressed air as an example of pressure fluid. As shown in FIG. 3A, the hose 120 to be turned over by the hose turnover device 106 has a coating layer 121 integrally formed on the outer surface of the cylindrical woven fabric. A plurality of warp yarns 122a and weft yarns 122b woven in the circumferential direction are arranged in the tubular woven fabric.

A thermoplastic resin such as a polyurethane resin or a polyester elastomer is used for the coating layer 121 . As the weft yarn 122b of the hose 120, polyester fiber yarn, which is a general fiber, and low-stretch yarn such as aramid fiber and high-strength polyethylene fiber can be used. The length of the weft yarn 122b to be woven in the circumferential direction is calculated backward from the strength (elongation characteristic) of the fiber used so that the outer diameter of the hose 120 is equal to or less than the maximum width Lb of the gap 110 between the conduit 102 and the OF cable 104. 3B, the outer diameter of the hose 120 will not expand beyond a certain diameter, for example, 40 mm (see arrow B). Therefore, there is no danger that the hose 120 will deform the pipeline or the like when it is reversed.

The hose inverter 106 comprises a pressure vessel 124 into which compressed air is introduced, an injection port 126 and an inlet port 128, as shown in FIG. The injection port 126 is a cylindrical portion provided at the tip of the pressure vessel 124, and the hose 120 is inverted while being injected (see FIG. 3B). A tip 130 of the hose 120 is led out of the container through the injection port 126 and is turned upside down (inverted).

4 is a view of the rear end of the pressure vessel 124 of the hose inverter 106. FIG. An inlet 128 is provided at the rear end of the pressure vessel 124 as shown, and draws in the hose 120 from outside the vessel (see arrow C). Since the hose 120 is drawn from the outside of the container in this way, it is not necessary to store the hose 120 in the pressure container 124 in advance. Therefore, the pressure vessel 124 can be reduced in size.

In addition, a packing 134 such as a rubber plate is provided at the introduction port 128 in order to maintain airtightness while drawing the hose 120 from the outside of the container. The packing 134 is pressed against the hose 120 by pressure for feeding the hose 120 from the injection port 126 (see arrow D). Therefore, resistance is generated between the packing 134 and the hose 120 at the inlet 128 .

Therefore, a feeding mechanism 136 is provided inside the pressure vessel 124 as shown in FIG. The feed mechanism 136 includes a pair of feed rollers 138 driven by a motor (not shown). The delivery rollers 138 sandwich the hose 120 drawn from the introduction port 128 of the pressure vessel 124 from above and below and deliver it toward the injection port 126 (see arrow E). Therefore, even if resistance occurs at the introduction port 128 , the resistance is reduced or offset by the feeding mechanism 136 . Therefore, the resistance of inlet 128 does not prevent hose 120 from reversing at outlet 126 .

An oil hose 162 can be connected to the tip side of the pressure vessel 124, and a sprinkling part 166 serving as an inlet for an oil-based lubricant such as silicone oil is provided. The spraying portion 166 is provided between the feeding mechanism 136 and the injection port 126 in front of the feeding mechanism 136 so as not to interfere with the function of the feeding mechanism 136. It is applied to the outer surface of hose 120 .

Some of the silicone oil adhering to the hose 120 runs down, but is recovered from a recovery port 168 provided at the bottom of the pressure vessel 124, circulated by a circulation device 160 consisting of an oil hose 162 and a pump 164, and applied repeatedly.

5 to 7, the case of using the hose reversing device 106 for the disaster prevention measures will be described below. FIG. 5 is a diagram for explaining a reversing insertion step (hose reversing construction method) by the hose reversing device 106. As shown in FIG. FIG. 6 is a diagram for explaining the reversing insertion process subsequent to FIG.

The hose reversing device 106 can be reduced in size because the hose is pulled in from the outside of the pressure vessel 124 as described above. Therefore, the hose reversing device 106 can be installed even in a narrow space such as a manhole 112 facing one end 140 of the pipeline 102 (see FIG. 1(a)).

The hose 120 is folded and stacked outside the pressure vessel 124 as shown, and the fire-extinguishing tube 108 is tied to the rear end 142 of the hose 120 . The length of the hose 120 is substantially the same as that of the pipeline 102 .

In addition, in order to reduce the friction between the tubular woven fabrics at the time of reversing and improve the reversing property, a water-based lubricant mainly composed of an isopropyl alcohol aqueous solution is injected into the inside of the hose 120, that is, the tubular woven fabric.・It is preferable to apply it in advance. The lubricant to be used is preferably water-based rather than oil-based. Since the cylindrical woven fabric becomes the outer surface of the hose 120 after being turned over, the applied lubricant may come into contact with the outer surface of the cable or the inner surface of the conduit, causing an adverse effect. However, water-based lubricants can be prevented from having adverse effects because the moisture content of the water-based lubricants is easily vaporized and solidified by the heat from the cable.

When lubricating agent is applied to the inside of the hose 120 in advance, it is preferable that the surface of the delivery roller 138 is provided with fine irregularities. Due to the recesses and protrusions, the lubricating agent inside the hose 120 is not squeezed out by the delivery roller 138 .

An air tank 148 and a compressor 150 are connected to the pressure vessel 124 via pipes 144 and 146 . This allows compressed air from the compressor 150 to be introduced into the pressure vessel 124 via the pipe 144 .

Such a hose reversing device 106 is installed in the manhole 112, and in a state in which the injection port 126 of the pressure vessel 124 faces one end 140 of the pipe line 102, the oil-based lubricant is sprayed on the outer surface of the hose 120 from the spraying part 166. while introducing compressed air into the pressure vessel 124 . As a result, the hose 120 is pulled into the pressure vessel 124 from the outside through the introduction port 128, and the hose 120 is sent out toward the injection port 126 by the feeding mechanism 136 (see FIG. 2). The hose 120 sent out toward the injection port 126 is pressurized by the compressed air introduced into the pressure vessel 124 , and is reversed at the injection port 126 of the pressure vessel 124 toward the pipeline 102 .

Subsequently, as shown in FIG. 6, the hose 120 that has been folded outside of the pressure vessel 124 is pulled through the inlet 128 of the pressure vessel 124 and turned over at the injection port 126 while one end 140 of the conduit 102 is pulled. from toward the other end 152 . Both the outer surface of the uninverted hose (uninverted hose portion 120a) and the inner surface of the inverted hose (inverted hose portion 120b) are both coated layers 121 made of thermoplastic resin. is adhered, the frictional resistance between the coating layers 121 is greatly reduced, the reversal proceeds smoothly, and the reversal pressure can be reduced.

FIG. 7 is a diagram showing the tube drawing process subsequent to FIG. When about half the length of hose 120 enters conduit 102, as shown in FIG. It is drawn in and begins to be fed toward the injection port 126 by the feeding mechanism 136 . At this time, since the hose 120 in a flat state is switched to the tube-shaped fire-extinguishing tube 108, the space between the delivery rollers 138 is appropriately adjusted and widened by the upper handle. By sending out the fire extinguishing tube 108 by the feeding mechanism 136, an action of pushing the uninverted portion 120a of the hose through the rear end 142 of the hose 120 in the advancing direction works, and a function of assisting the inverting movement of the hose 120 is generated.

Then, as shown in FIG. 7(b), the hose 120 entering from one end 140 toward the other end 152 of the pipeline 102 is finally turned over over its entirety, and the rear end 142 extends beyond the pipeline 102 as shown in the figure. End 152 is reached. As a result, the fire-extinguishing tube 108 tied to the rear end 142 of the hose 120 is carried by the hose 120 to reach the other end 152 of the conduit 102 as shown.

Then, an operator accesses from the manhole 114 (see FIG. 1A) facing the other end 152 of the pipeline 102 and cuts the rear end 142 . The inverted hose 120 may be left or may be pulled out if possible. In this manner, a disaster prevention measure can be realized in which the fire-extinguishing tube 108 is drawn from one end 140 to the other end 152 of the pipeline 102 .

FIG. 8 is a diagram illustrating the diameters of hoses 120 and 120A. In the drawing, the hoses 120 and 120A are illustrated in a state of entering the pipeline 102 while being inverted.

In the hose reversing method (hose lining method), the larger the diameter of the hose, the easier it is to reverse, which is advantageous for long-distance transportation. It is natural to want to increase the diameter of the hose, especially over long distances, such as the object of the present invention. However, in this embodiment, the diameter La of the hose 120, as shown in FIG. is also small.

On the other hand, a hose 120A of a comparative example shown in FIG. 8B has a diameter larger than the maximum width Lb of the crescent-shaped gap 110 . In this case, when the hose 120A is inverted and enters the pipeline 102, the contact area between the OF cable 104 and the inner surface of the pipeline 102 increases as shown. Therefore, the hose 120A may wind around the OF cable 104 or deform the conduit 102 .

On the other hand, in the hose 120 shown in FIG. 8A, since the diameter La is smaller than the maximum width Lb of the gap 110, when the hose 120 is reversed and enters the pipeline 102, the inner surface of the pipeline 102 difficult to contact. Therefore, the hose 120 is less likely to wind around the OF cable 104 and the conduit 104 is not deformed.

As described above, according to the hose reversing device 106 of this embodiment, the size of the pressure vessel 124 can be reduced, so that it can be installed in a narrow space such as the manhole 112 . By using the hose reversing device 106 installed in the manhole 112 , the hose 120 pulled in from the introduction port 128 can be reversed at the injection port 126 and reliably entered into the pipeline 102 . Furthermore, by tying the fire-extinguishing tube 108 to the rear end 142 of the hose 120, the fire-extinguishing tube 108 can be reliably pulled into the pipeline 102.

In addition, the inverted hose 120 does not expand beyond the maximum width Lb of the gap 110 between the conduit 102 and the OF cable 104 due to the weft 122b arranged in the circumferential direction (see FIG. 3B). Therefore, even when the hose 120 is reversed and inserted into the narrow conduit 102, there is no possibility that the hose 120 will contact the inner surface of the conduit 102 and apply high pressure, and the conduit 102 will not be deformed. can be prevented.

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 hose reversing device for inserting a hose into a pipe, a hose reversing construction method, and a hose used therein.

DESCRIPTION OF SYMBOLS 100... Bridge, 102... Pipe line, 104... OF cable, 106... Hall reversing device, 108... Fire-extinguishing tube, 110... Gap of pipe line, 112, 114... Manhole, 116, 118... Fire-extinguishing pump, 120... Hose, 120a Hose non-inverted portion 120b Hose already inverted portion 121 Coating layer 122a Hose warp 122b Hose weft 124 Pressure vessel 126 Injection port 128 Inlet 130 Tip of hose , 132... Fixing tool 134... Packing of introduction port 136... Feeding mechanism 138... Feeding roller 140... One end of pipe line 142... Rear end of hose 144, 146... Piping 148... Air tank 150... Compressor , 152... Other end of pipeline 160... Circulation device 162... Oil hose 164... Pump 166... Sprinkling part 168... Recovery port Lb... Maximum width of gap in pipeline

Claims (2)

A hose reversing device that uses pressure fluid to reverse a hose and enter a gap in a pipeline ,
a pressure vessel into which the pressure fluid is introduced;
an injection port provided at the tip of the pressure vessel for injecting while reversing the hose;
an inlet provided at the rear end of the pressure vessel for drawing in the hose from outside the vessel;
a feeding mechanism provided inside the pressure vessel for feeding the hose drawn from the introduction port toward the injection port;
the hose folded and stacked outside the pressure vessel;
A fire extinguishing tube connected to the rear end of the hose ,
The gap is formed in a crescent shape by the pipeline and a cable laid in the pipeline,
In the hose, a plurality of warps and wefts woven in the circumferential direction thereof are arranged, and the diameter of the hose at the time of reversal is made smaller than the maximum width of the crescent-shaped gap by the wefts, A hose reversing device that is spaced from the inner surface of a conduit and enters the gap while making line contact with the outer surface of the cable . A hose reversing method in which a hose is reversed and inserted into a gap in a pipeline in which a cable is laid using a pressure fluid,
The gap is formed in a crescent shape by the conduit and the cable,
A hose in which a plurality of warp yarns and weft yarns woven in the circumferential direction thereof are arranged, wherein the diameter of the hose when reversed is made smaller than the maximum width of the crescent-shaped gap by the weft yarns. , a hose that is spaced from the inner surface of the conduit and enters the gap while making line contact with the outer surface of the cable ;
a pressure vessel into which the pressure fluid is introduced;
an injection port provided at the tip of the pressure vessel for injecting while reversing the hose;
an inlet provided at the rear end of the pressure vessel for drawing in the hose from outside the vessel;
Using a hose reversing device including a feeding mechanism for feeding the hose drawn from the introduction port toward the injection port,
A hose reversing construction method, wherein the hose is reversed from the injection port and entered into the gap in the pipeline using a pressure fluid while the hose is drawn from the introduction port.

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