JP7710719B2 - Pipe lining exhaust device - Google Patents

Description

This relates to an exhaust device for lining pipes that exhausts steam used to heat the lining material.

Some buried pipelines, such as storm water drainage pipelines and sewerage pipelines, are damaged due to aging, subsidence, or fluctuations in ground pressure. When repairing damaged pipelines, it is preferable to do so without excavation, as this reduces repair costs and minimizes traffic disruptions.

As a result, various techniques have been proposed as trenchless pipeline repair methods, in which a tubular lining material impregnated with a thermosetting resin is pressed against the inner wall of the pipeline and the inner wall is lined with the lining material (see, for example, Patent Document 1). Even when a new pipeline is buried, the inner wall of the newly buried pipeline may be lined with a lining material.

In the pipeline lining technology proposed in Patent Document 1, high-temperature air heated by a heating means is sent inside the lining material. This high-temperature air heats the lining material while pressing it against the inner surface of the pipeline, and the hardening of the thermosetting resin in the lining material progresses. Then, by continuing to supply high-temperature air for a predetermined period of time, the strength of the hardened thermosetting resin can be improved after the hardening of the thermosetting resin in the lining material is complete. After the supply of high-temperature air, the lining material is cut and the cut pipe opening is finished as necessary.

In order to efficiently supply heat to the lining material, high-temperature steam is sometimes pumped into the inside of the lining material. When high-temperature steam is used, the steam is pumped into the inside of the lining material until the thermosetting resin impregnated in the lining material has cured and its strength has been improved. As the steam passes through the inside of the lining material, it loses a certain amount of heat to the lining material and is then exhausted from an exhaust duct installed on the ground. If steam is exhausted near a road, the exhausted steam is cloudy and may obstruct the view of drivers of vehicles passing by. As a countermeasure to this, it has been proposed to extend the exhaust duct to a high position (see, for example, Patent Document 2, etc.).

JP 2017-52228 A JP 2018-89877 A

However, simply raising the exhaust duct may cause the exhausted steam floating around to fall to the ground due to its own weight or wind, which may obstruct the visibility of drivers of vehicles passing by.

In view of the above circumstances, the present invention aims to provide an exhaust device for lining pipes that suppresses the effects of exhausted steam.

The exhaust system for lining a pipeline of the present invention, which solves the above problems, is as follows:
an exhaust duct having a steam exhaust flow path formed therein through which steam flows that has heated a thermosetting resin impregnated in a lining material that lines a duct, and having an exhaust port at a downstream end of the steam exhaust flow path for exhausting the steam to the outside;
an outside air supply device that supplies outside air to the steam exhaust flow path,
the exhaust duct has a duct body that defines the steam exhaust flow path, and a branch pipe that allows outside air supplied from the outside air supply device to flow into the steam exhaust flow path,
The duct body has an inner circumferential surface that is cylindrical,
The branch pipe is characterized in that it causes the outside air supplied by the outside air supply device to flow into the steam exhaust flow passage so as to swirl along the inner circumferential surface.
Also, an exhaust duct having a steam exhaust flow path formed therein through which steam flows after heating a thermosetting resin impregnated in a lining material lining the duct, and an exhaust port at a downstream end of the steam exhaust flow path for exhausting the steam to the outside;
The steam exhaust system may further include an outside air supply device that supplies outside air to the steam exhaust passage.

According to the exhaust device for lining a pipe of the present invention, outside air is added to the steam flowing through the steam exhaust flow passage, so the concentration of the steam exhausted from the exhaust port is reduced. This makes it possible to prevent the exhausted steam from obstructing visibility.

In addition, in the exhaust system for lining a pipeline of the present invention,
the exhaust duct has a duct body that defines the steam exhaust flow path, and a branch pipe that allows outside air supplied from the outside air supply device to flow into the steam exhaust flow path,
The branch pipe may be disposed at an incline with respect to the steam exhaust passage so as to approach the steam exhaust passage toward a downstream side of the steam exhaust passage.

With this exhaust device for lining pipes, the outside air supplied from the outside air supply device flows into the steam exhaust passage in a direction toward the exhaust port, so that the outside air flows downstream together with the steam flowing through the steam exhaust passage, facilitating exhaust. As a result, it becomes easier to send new high-temperature steam inside the lining material.

Here, the branch pipe may be connected to the duct body. The branch pipe may also send outside air toward the downstream side of the steam exhaust flow path. Furthermore, the branch pipe may be inclined at an angle of 15 degrees or more and 75 degrees or less with respect to the duct body. In addition, the duct body may extend upward.

Furthermore, in the exhaust system for lining a pipeline of the present invention,
The branch pipe may be connected to the duct body at a downstream portion of the steam exhaust passage.

With this exhaust system for lining pipes, the outside air sent in from the outside air supply device tends to flow toward the exhaust port, which is relatively close, and is less likely to flow back upstream, so the outside air is prevented from acting as a resistance to the flow of steam downstream in the steam exhaust flow path. This also makes it easier to send new high-temperature steam inside the lining material.

Furthermore, in the exhaust system for lining a pipeline of the present invention,
The duct body has an inner circumferential surface that is cylindrical,
The branch pipe may cause the outside air supplied by the outside air supply device to flow into the steam exhaust flow passage so as to swirl along the inner circumferential surface.

With this exhaust device for lining pipes, a swirling flow is created in the steam exhaust passage by the outside air supplied from the outside air supply device, and the steam flowing through the steam exhaust passage mixes with the outside air and swirls toward the exhaust port. The steam is then exhausted from the exhaust port while swirling, making it easy for the exhausted steam to diffuse. As a result, the concentration of the exhausted steam becomes thinner, further reducing the obstruction of visibility.

Here, the branch pipe may send outside air supplied by the outside air supply device into the steam exhaust flow path from a tangential direction of the inner circumferential surface when viewed from the longitudinal direction of the exhaust duct.

In addition, in the exhaust system for lining a pipeline of the present invention,
A silencer is provided to suppress noise generated by steam exhausted from the exhaust port,
The exhaust duct may be connected to the silencer.

The noise generated by the exhaust steam can be suppressed by the silencer. Here, the exhaust duct may be detachably connected to the silencer.

The present invention provides an exhaust device for lining pipes that suppresses the effects of exhausted steam.

FIG. 1 is a perspective view showing one embodiment of a lining material used to line a pipeline. FIG. 2 is a cross-sectional view showing a schematic diagram of lining with the lining material shown in FIG. 1 using the pipeline lining system. 3A is a front view showing the exhaust duct shown in FIG. 2, and FIG. 3B is a cross-sectional view of the exhaust duct shown in FIG. 2A taken along line AA. 3 is a flow chart showing the process of lining a storm water drainage pipe at a construction site using the pipe lining system shown in FIG. 2 . 4 is a graph roughly showing an example of changes in temperature, etc. of heating steam supplied to an internal space of a lining material. 4A is a side view showing a modified example of the exhaust duct shown in FIG. 3, and FIG. 4B is a plan view of the exhaust duct shown in FIG.

The following describes an embodiment of the present invention with reference to the drawings. In this embodiment, an example is described in which the pipe lining exhaust device of the present invention is applied to a pipe lining system that lines storm water drainage pipes that are buried under the road surface of an expressway between the shoulder side and the median strip side to drain storm water from the expressway.

Figure 1 is a perspective view showing one embodiment of a lining material used to line a pipeline.

The lining material 10 shown in FIG. 1 is a sleeve-shaped material used to line the inner wall of a storm water drainage pipe D (see FIG. 2) buried underground. FIG. 1 shows the sleeve-shaped lining material 10 flattened. This lining material 10 is made up of two sleeve-shaped lining materials, a base hose 100 and a calibration hose 110, which are integrated together. Hereinafter, the radially outer side of the lining material 10 will be simply referred to as the outer side, and the radially inner side will be simply referred to as the inner side. The base hose 100 is located outside the calibration hose 110. The calibration hose 110 is thinner than the base hose 100.

The base hose 100 has a substrate layer 101 and an outer film layer 102. The substrate layer 101 shown in FIG. 1 is a polyester nonwoven fabric. Note that the substrate layer 101 is not limited to polyester, and may be a nonwoven fabric made of an organic fibrous material such as nylon, acrylic, or vinylon, or a woven fabric made of such an organic fibrous material, or a nonwoven or woven fabric made of an inorganic fibrous material such as carbon fiber or glass fiber, or may even be a combination of an organic fibrous material and an inorganic fibrous material.

The base layer 101 shown in FIG. 1 is impregnated with a compound. The compound impregnated into the base layer 101 is mainly composed of vinyl ester (epoxy acrylate) resin. Note that unsaturated polyester resin, urethane acrylate resin, etc. may be used instead of vinyl ester resin. Vinyl ester resin is a type of thermosetting resin that is crosslinked by radical polymerizable monomers. The compound contains a crosslinking agent, a viscosity adjuster, a filler, a curing agent (peroxide, etc.), various additives, etc.

The outer film layer 102 covers the base layer 101 from the outside and has the function of preventing the compound impregnated in the base layer 101 from seeping outward. In other words, the outer film layer 102 is impermeable to water. The outer film layer 102 shown in FIG. 1 has a laminated structure (PE/NY/PE) in which nylon (NY) is sandwiched between polyethylene (PE). Note that other polyolefins such as polypropylene may be used instead of polyethylene, and furthermore, it may have a single layer structure rather than a laminated structure.

The calibration hose 110 has a base layer 111 and an extension layer 112. The base layer 111 of the calibration hose 110 shown in FIG. 1 is a polyester nonwoven fabric, like the base layer 101 of the base hose 100. Note that the base layer 111 is not limited to polyester, and may be a nonwoven fabric made of an organic fibrous material such as nylon, acrylic, or vinylon, or a woven fabric made of such an organic fibrous material, or a nonwoven or woven fabric made of an inorganic fibrous material such as carbon fiber or glass fiber, or may even be a combination of an organic fibrous material and an inorganic fibrous material.

The base material layer 111 of the calibration hose 110 shown in FIG. 1 is also impregnated with a compound. The compound used in the calibration hose 110 is also mainly composed of a thermosetting resin, and the thermosetting resin may be selected from unsaturated polyester, epoxy (meth)acrylate, urethane (meth)acrylate, and unsaturated polyester acrylate. This compound also contains a crosslinking agent, a viscosity adjuster, a filler, a curing agent (peroxide, etc.), various additives, etc.

The stretch layer 112 is made of polyurethane and forms the innermost surface of the lining material 10, and has excellent stretchability. In other words, it has better stretchability than the outer film layer 102 of the base hose 100.

Next, we will explain the method for manufacturing the lining material shown in Figure 1. The method described here is carried out in a factory.

First, prepare an appropriate material suitable for the pipeline to be lined. The materials prepared here include a base hose 100 that is not impregnated with compound, and a calibration hose 110 that is also not impregnated with compound. These hoses (100, 110) are sleeve-shaped and cut to a length according to the length of the pipeline to be lined, and are prepared separately. The base hose 100 prepared here has an outer film layer 102 located on the outside, and a base material layer 101 located on the inside of the outer film layer 102. On the other hand, the calibration hose 110 has an extension layer 112 located on the outside, and a base material layer 111 located on the inside of the extension layer 112. In other words, the calibration hose 110 is in a reversed state to the state of the calibration hose 110 shown in FIG. 1.

The base hose base agent, filler, curing agent (peroxide, etc.), and various additives that will form the compound to be impregnated into the base hose 100 are also prepared. The base hose base agent prepared here has vinyl ester, a thermosetting resin, as its main component (50% by weight or more). A crosslinking agent and a viscosity modifier are also used in the compound. Furthermore, the base hose base agent also contains silica as a thixotropy agent, cobalt naphthenate as a curing accelerator, and a polymerization inhibitor.

In addition, the calibration hose base material, filler, hardener, and various additives that will form the compound to be impregnated into the calibration hose 110 are also prepared. The calibration hose base material is also primarily composed of thermosetting resin. The calibration hose compound also uses methacrylic acid ester as a cross-linking agent and viscosity adjuster.

Next, the resin is mixed. Here, the base resin, filler, hardener, and various additives for the base hose are mixed to prepare the compound for the base hose. The base resin, filler, hardener, and various additives for the calibration hose are also mixed to prepare the compound for the calibration hose.

Next, the base layer 101 of the base hose 100 is impregnated with the compound for the base hose. The base layer 111 of the calibration hose 110 is also impregnated with the compound for the calibration hose. The base layer 101 of the base hose 100 is impregnated with the compound to saturation, and the base layer 111 of the calibration hose 110 is impregnated with the compound to supersaturation. That is, the impregnation rate of the compound is set higher in the base layer 111 of the calibration hose 110 than in the base layer 101 of the base hose 100. In this way, the base hose 100 impregnated with the compound and the calibration hose 110 in which the base layer 111 impregnated with the compound is located on the inside are prepared separately. Note that the base layer 101 of the base hose 100 may be impregnated with the compound to supersaturation, and the base layer 111 of the calibration hose 110 may be impregnated with the compound to saturation.

Next, the calibration hose 110 is inverted and inserted inside the base hose 100 impregnated with the compound. In the inverted insertion, the calibration hose 110 with the base material layer 111 located on the inside is turned over so that the base material layer 111 is on the outside, and the calibration hose 110 is inserted inside the base hose 100. The calibration hose 110 is inserted inside the base hose 100 from one end side of the base hose 100, and is inverted and inserted by the force of air or water. Since the calibration hose 110 is thinner than the base hose 100, inverted insertion is easily performed. By inverting and inserting the calibration hose 110, the base material layer 101 of the base hose 100 and the base material layer 111 of the calibration hose 110 come into contact with each other, and the lining material 10 in which the two sleeve-shaped members, the base hose 100 and the calibration hose 110, are integrated as shown in FIG. 1 is completed. As shown in FIG. 1, the outermost surface of the lining material 10 is composed of an outer film layer 102, and its innermost surface is composed of an extension layer 112. Between the outer film layer 102 and the extension layer 112, base material layers 101, 111 impregnated with a thermosetting resin are disposed. Then, a steam supply tube 36 (see FIG. 2) for supplying steam for heating the lining material 10 is inserted inside the extension layer 112.

The completed lining material 10 is flattened and folded in a zigzag pattern for storage at low temperature. The completed lining material 10 may also be stored at low temperature in a rolled-up state. The lining material 10 stored at low temperature is transported to the construction site in a refrigerated truck in the folded or rolled-up state.

Next, we will explain each device in the pipeline lining system 3.

Figure 2 is a cross-sectional view showing a schematic of lining with the lining material shown in Figure 1 using a pipe lining system. This Figure 2 shows the pipe lining system 3 installed on the shoulder side of a two-lane highway HW. Also shown in Figure 2 are a vehicle V traveling in the lane on the median strip side and a triangular cone TC for preventing the vehicle V from entering the lane on the shoulder side. Note that although Figure 2 shows the storm water drainage pipe D extending horizontally, the storm water drainage pipe D is actually slightly inclined so that the median strip side is located lower than the shoulder side in order to allow the storm water to flow down to the median strip side. Conversely, there are also cases where the storm water is allowed to flow down to the shoulder side. In that case, the storm water drainage pipe D is slightly inclined so that the shoulder side is located lower than the median strip side.

As shown in FIG. 2, the expressway HW is formed with a gutter G, a shoulder-side catchment box B1, a central-side catchment box B2, a storm water drainage pipe D, and a drainage pipe P. The gutter G extends along the shoulder of the expressway HW. Rainwater that falls on the expressway HW flows into the gutter G. The shoulder-side catchment boxes B1 are scattered at a predetermined interval along the extension direction of the expressway HW. The shoulder-side catchment boxes B1 are catchment boxes that collect rainwater that flows into the gutter G. The central-side catchment boxes B2 are also scattered at a predetermined interval along the extension direction of the expressway HW. The storm water drainage pipe D is made of concrete and connects the shoulder-side catchment box B1 and the central-side catchment box B2 under the road surface of the expressway HW, and is buried underground. The storm water drainage pipe D corresponds to an example of a pipe. Rainwater collected in the shoulder-side catchment basin B1 by the stormwater drainage pipe D flows down to the center-side catchment basin B2. The drain pipe P is a pipe that drains the rainwater that flows down to the center-side catchment basin B2 to the outside of the expressway HW. Figure 2 shows that multiple cracks C1 to C4 have occurred in the stormwater drainage pipe D. Figure 2 also shows that the stormwater drainage pipe D is lined with a lining material 10 over its entire length. Note that in Figure 2, the sizes of the shoulder-side catchment basin B1, the center-side catchment basin B2, and the stormwater drainage pipe D are exaggerated.

The pipeline lining system 3 includes a boiler 31, a first compressor 32, a mixing device 33, a roadside fixture 34, a supply hose SH, an exhaust hose CH, a central fixture 35, a steam supply tube 36, a drain discharge pipe 37, and an exhaust device 38. This pipeline lining system 3 is installed at the construction site to line the storm water drainage pipeline D.

The boiler 31, the first compressor 32, and the mixing device 33 are mounted on a boiler vehicle (not shown) parked on the ground. The boiler 31 sends out superheated steam, for example, heated to over 100°C. The steam sent out from the boiler 31 may be saturated steam. The first compressor 32 and the mixing device 33 are also installed on the ground near the boiler 31. The first compressor 32 compresses and sends out outside air. The superheated steam sent out from the boiler 31 and the outside air sent out from the first compressor 32 are both supplied to the mixing device 33 and mixed. Hereinafter, the mixed gas of the superheated steam and the outside air mixed and sent out by the mixing device 33 is referred to as heating steam. A steam valve 311 is provided in the pipe connecting the boiler 31 and the mixing device 33, and a first air valve 321 is provided in the pipe connecting the first compressor 32 and the mixing device 33. By adjusting the amount of throttling by operating the steam valve 311 and the first air valve 321, it is possible to adjust the temperature of the heating steam sent out from the mixing device 33 and to adjust the flow rate of the heating steam.

The shoulder-side jig 34 is disposed near the lower end of the shoulder-side catchment basin B1. The shoulder-side jig 34 includes a shoulder-side plug member 341, a shoulder-side fastening member 342, and a tube fastening member 343. The shoulder-side plug member 341 has a steam supply pipe 3411 and a steam exhaust pipe 3412, and has a cylindrical shape with the end face on the shoulder side closed except for the inside of the steam supply pipe 3411 and the steam exhaust pipe 3412. The steam supply pipe 3411 and the steam exhaust pipe 3412 penetrate the closed end face on the shoulder side and are fixed to the end face. In the state in which the heating steam is supplied as shown in FIG. 2, the shoulder-side end of the lining material 10 is fixed to the cylindrical portion of the shoulder-side plug member 341 by being fastened to the outer peripheral surface of the cylindrical portion of the shoulder-side plug member 341 by the shoulder-side fastening member 342. In addition, when heating steam is being supplied, the roadside end of the steam supply tube 36 is fixed to the steam supply pipe 3411 by being clamped to the outer circumferential surface of the steam supply pipe 3411 by the tube clamping member 343.

The supply hose SH is a hose connected at one end to the mixing device 33 and at the other end to the steam supply pipe 3411 of the roadside plug member 341. The exhaust hose CH is a hose connected at one end to the steam exhaust pipe 3412 of the roadside plug member 341 and at the other end to the silencer 381 of the exhaust device 38, which will be described later. An exhaust valve CH1 is provided midway along the exhaust hose CH to adjust the flow rate of the fluid flowing through the exhaust hose CH. The heating steam, whose temperature has been reduced to a certain degree by heating the lining material 10, is discharged from the steam exhaust pipe 3412 and flows into the exhaust hose CH. Hereinafter, the heating steam discharged from the steam exhaust pipe 3412 after completing its heating function will be simply referred to as steam.

The central jig 35 is disposed near the lower end of the central catchment basin B2. The central jig 35 includes a central fastening drum 351 and a central fastening member 352. The central fastening drum 351 is a cylindrical drum with both ends open. In the state in which the heating steam is supplied as shown in FIG. 2, the central end of the lining material 10 and the central end of the steam supply tube 36 are both fastened to the outer circumferential surface of the central fastening drum 351 by the central fastening member 352. It is also possible to simply fasten together the central end of the lining material 10 and the shoulder end of the steam supply tube 36 without using the central fastening drum 351. However, by using the central fastening drum 351, it is possible to firmly fasten the central end of the lining material 10 and the central end of the steam supply tube 36. As will be described later, heating steam is supplied to the inside of the lining material 10 and the inside of the steam supply tube 36. By firmly fastening the central end of the lining material 10 and the central end of the steam supply tube 36, it is possible to prevent the heating steam from leaking out from the central ends. Note that the lining material 10 may have its central end blocked in advance. Similarly, the steam supply tube 36 may have its central end blocked in advance.

As described above, in the state where the heating steam is supplied as shown in FIG. 2, the steam supply tube 36 has its shoulder end fixed to the steam supply pipe 3411 and its center end fixed to the center fastening drum 351. As a result, the steam supply tube 36 extends from the shoulder-side catchment box B1 to the center-side catchment box B2 inside the lining material 10. In other words, the steam supply tube 36 extends over the entire length of the storm water drainage pipe D. Hereinafter, the space inside the lining material 10 and outside the steam supply tube 36 is referred to as the internal space IS. The steam supply tube 36 has round holes 362 with a diameter of about 1 cm at intervals of 1 m from the shoulder side to the median strip side, and further has slit holes 361 in the vicinity of the center-side catchment box B2 closest to the median strip. The slit holes 361 are, for example, 1 to 2 cm wide and 10 to 20 cm long. In FIG. 2, the slit hole 361 and the round hole 362 are drawn considerably larger. As shown in FIG. 2, the slit hole 361 and the round hole 362 are lined up in a row in the extension direction of the rainwater drainage pipe D, and the round hole 362 and the slit hole 361 are also lined up in a row in the extension direction of the rainwater drainage pipe D on the opposite side of the steam supply tube 36 by 180 degrees in the circumferential direction. From the slit hole 361 and the round hole 362, the heating steam sent from the mixing device 33 into the steam supply tube 36 via the supply hose SH and the steam supply pipe 3411 is blown out.

The drain discharge pipe 37 is inserted near the end of the lining material 10 on the median strip side. In FIG. 2, for convenience of illustration, the drain discharge pipe 37 is depicted as being inserted in the upper part of the lining material 10, but in reality, the drain discharge pipe 37 is inserted in the lower end part of the lining material 10. A certain amount of heat is absorbed by the lining material 10 from the heating steam, and a part of the heating steam is converted into drain in the internal space IS of the lining material 10. A pipe equipped with a valve 371 is connected to the drain discharge pipe 37. By opening the valve 371, the drain generated in the internal space IS is discharged to the outside of the lining material 10.

The exhaust device 38 includes a silencer 381, an exhaust duct 382, and a second compressor 383. This exhaust device 38 corresponds to an example of an exhaust device for lining a pipeline. Inside the silencer 381, a space with a cross-sectional area larger than the cross-sectional area of the exhaust hose CH is formed. In addition, a sound absorbing material is arranged inside the silencer 381. The heating steam carries sound waves such as the cooking sound of the boiler 31, and sound may also be generated when the heating steam passes through each part. The silencer 381 is for silencing these sounds.

The exhaust duct 382 is detachably connected to the silencer 381. Inside the exhaust duct 382, a steam exhaust flow path 382a (see FIG. 3) through which steam flows is formed. The exhaust duct 382 has an exhaust port 382b that exhausts the steam that has passed through the steam exhaust flow path 382a to the outside. The configuration of the exhaust duct 382 will be described in detail later.

The second compressor 383 compresses and sends out outside air. This second compressor 383 corresponds to an example of an outside air supply device. The exhaust duct 382 and the second compressor 383 are connected by an air supply hose AH. The air supply hose AH is provided with a second air valve AH1. By adjusting the amount of throttling by operating this second air valve AH1, the flow rate of outside air sent to the steam exhaust flow path 382a can be adjusted.

Figure 3(a) is a front view showing the exhaust duct shown in Figure 2, and Figure 3(b) is a cross-sectional view of the exhaust duct shown in Figure 3(a) taken along line A-A.

3(a) and 3(b), the exhaust duct 382 has a duct body 3821 and a branch pipe 3822. The duct body 3821 extends in the vertical direction, and the inner peripheral surface 382c has a cylindrical shape. The duct body 3821 is made of a thin metal plate, and the outer peripheral surface is also cylindrical. An exhaust port 382b is formed at the upper end of the duct body 3821. A notch 382e for attaching the exhaust duct 382 to the silencer 381 (see FIG. 2) is formed at the lower end of the duct body 3821. Although not shown, a notch 382e of the same shape is also formed on the opposite side of the duct body 3821 in the circumferential direction by 180 degrees. The silencer 381 has an outer periphery with approximately the same diameter as the inner periphery of the duct body 3821, and is provided with a protruding portion (not shown) that protrudes upward. A pair of bosses protruding in the circumferential direction are formed on the protruding portion. The pair of bosses are fitted into a pair of notches 382e of the duct body 3821, and the exhaust duct 382 is rotated a predetermined angle with its extension direction as the rotation center direction, so that the exhaust duct 382 is detachably connected to the silencer 381. As shown in FIG. 3B, a steam exhaust flow path 382a, whose downstream end is the exhaust port 382b, is formed inside the duct body 3821. The steam silenced by the silencer 381 flows into the steam exhaust flow path 382a through the above-mentioned protrusion provided on the silencer 381.

The branch pipe 3822 is connected to the duct body 3821 at the downstream part of the steam exhaust flow path 382a in the middle of the extension direction of the duct body 3821. In other words, the branch pipe 3822 is connected to the duct body 3821 at a position closer to the exhaust port 382b at the downstream end than the upstream end of the steam exhaust flow path 382a defined by the duct body 3821. The branch pipe 3822 can also be said to be a junction pipe that joins the duct body 3821. The branch pipe 3822 is installed at an inclination of 45 degrees with respect to the steam exhaust flow path 382a so as to approach the steam exhaust flow path 382a as it moves toward the downstream side of the steam exhaust flow path 382a. This inclination angle is preferably 15 degrees or more and 75 degrees or less. As shown in FIG. 3B, a connection port 382d is formed at the connection part between the duct body 3821 and the branch pipe 3822. As shown in FIG. 2, the air supply hose AH extending from the second compressor 383 is connected to the protruding end of the branch pipe 3822. Thus, the outside air supplied from the second compressor 383 passes through the air supply hose AH and the branch pipe 3822, and is sent from the connection port 382d to the steam exhaust flow path 382a. As described above, the inclination angle of the branch pipe 3822 with respect to the steam exhaust flow path 382a is preferably 15 degrees or more and 75 degrees or less. If the inclination angle is less than 15 degrees, it takes time for the steam flowing through the steam exhaust flow path 382a and the outside air supplied from the second compressor 383 and sent to the steam exhaust flow path 382a to mix in the steam exhaust flow path 382a. For this reason, there is a risk that a part of the air will be exhausted from the exhaust port 382b without being mixed. Furthermore, if the inclination angle of the branch pipe 3822 exceeds 75 degrees, the effect of promoting the flow of steam downstream through the steam exhaust flow path 382a is weakened, and there is a risk that some of the outside air sent into the steam exhaust flow path 382a will flow back and obstruct the flow of steam through the steam exhaust flow path 382a.

Next, we will explain the pipe lining method in which the lining material 10 described above is used to line the storm water drainage pipe D with the pipe lining system 3.

Figure 4 is a flowchart showing the process of lining a storm water drainage pipe at a construction site using the pipe lining system shown in Figure 2.

At the construction site, construction preparations are first made (step S1). Here, the lane on the shoulder side of the expressway is closed, and the lining material 10 is transported to the construction site in a refrigerated truck. Next, the inside of the storm water drainage pipe D is cleaned, and the storm water drainage pipe D is inspected using a television camera traveling inside the storm water drainage pipe D (step S2). This inspection allows confirmation of any damaged areas in the storm water drainage pipe D, etc.

Next, the lining material 10 is pulled into the storm water drainage pipe D together with the steam supply tube 36 inserted inside (step S3). The lining material 10 is pulled into the storm water drainage pipe D from the refrigerated vehicle through the shoulder side water collection box B1 together with the steam supply tube 36. Here, a winch is first installed near the entrance of the central side water collection box B2, and the rear end of the wire wound around the winch is inserted into the central side water collection box B2, and the wire is passed through to the shoulder side water collection box B1. Then, the front end of the lining material 10 is bound to the front end of the steam supply tube 36 by the rear end of the wire, and the wire is wound up with the winch, so that the lining material 10 is pulled into the storm water drainage pipe D to be lined together with the steam supply tube 36. When the wire is wound up until the leading portion of the lining material 10 and the steam supply tube 36 emerges from the connection portion of the lining storm water drainage pipe D with the central catchment basin B2, the winch is stopped and retraction is completed. At the point where retraction is completed, the ends of the lining material 10 and the steam supply tube 36 on the median strip side emerge from the storm water drainage pipe D into the central catchment basin B2. Meanwhile, the end of the lining material 10 on the road shoulder side has not been retracted into the storm water drainage pipe D and remains in the road shoulder catchment basin B1.

Next, the lining material 10 is set in the storm water drainage pipe D (step S4). In this setting, first, the wire binding the lining material 10 and the front end of the steam supply tube 36 is removed. Then, the ends of the lining material 10 and the steam supply tube 36 on the median strip side are pressed against the central fastening drum 351 and fastened to the central fastening drum 351 by the central fastening member 352. As a result, the ends of the lining material 10 and the steam supply tube 36 on the median strip side are sealed. In addition, the steam supply pipe 3411 is fitted into the shoulder side end of the steam supply tube 36 and fastened from the outer periphery of the steam supply tube 36 by the tube fastening member 343. Furthermore, the cylindrical portion of the shoulder side plug member 341 is fitted into the shoulder side end of the lining material 10 and fastened from the outer periphery of the lining material 10 by the shoulder side fastening member 342. As a result, the shoulder side between the lining material 10 is also sealed, and only the steam supply pipe 3411 to which the steam supply tube 36 is connected and the steam exhaust pipe 3412 connect the inside and outside of the lining material 10.

In addition, in step S4, a boiler truck is parked near the entrance of the shoulder-side water collection basin B1 in place of the refrigerated truck. This leaves the first compressor 32, the mixing device 33, and the exhaust device 38 installed on the ground. The exhaust device 38 is also installed on the ground. One end of the supply hose SH is then connected to the mixing device 33, and the other end is connected to the steam supply pipe 3411 of the shoulder-side plug member 341. One end of the exhaust hose CH is then connected to the steam exhaust pipe 3412 of the shoulder-side plug member 341, and the other end is connected to the silencer 381 of the exhaust device 38.

After the above preparations are complete, the exhaust valve CH1 is fully opened to start the first compressor 32, and outside air is supplied to the mixing device 33, the supply hose SH, the steam supply pipe 3411, and the steam supply tube 36. This causes the steam supply tube 36 to expand into a cylindrical shape, and outside air begins to blow out from the slit hole 361 and the round hole 362 into the internal space IS of the lining material 10. If the supply of outside air continues even after the steam supply tube 36 expands, the amount of outside air blowing out from the slit hole 361 and the round hole 362 increases, and the blown outside air fills the internal space IS. Then, as the exhaust valve CH1 is gradually closed, the lining material 10 expands and expands in diameter. When the lining material 10 expands sufficiently, the outer film layer 102 of the lining material 10 is pressed against the inner wall of the rainwater drainage pipe D. The pressure (pressure) of the lining material 10 against the storm water drainage pipe D is checked, and the opening of the exhaust valve CH1 is adjusted to achieve an appropriate pressure (step S5).

Next, the steam valve 311 is opened to send out superheated steam from the boiler 31, and the mixing device 33 mixes the superheated steam with outside air from the first compressor 32 and starts supplying it to the internal space IS. At that time, the opening of the steam valve 311 is adjusted to adjust the temperature of the heating steam sent out from the mixing device 33. Also, if necessary, the opening of the first air valve 321 and the opening of the exhaust valve CH1 are adjusted to adjust the flow rate of the heating steam sent out from the mixing device 33 and the pressing pressure of the lining material 10 against the rainwater drainage pipe D. The heating steam sent out from the mixing device 33 is adjusted to about 80 to 100 ° C. Details of this adjustment will be described later. The sent heating steam is blown out from the slit hole 361 and the round hole 362 into the internal space IS and comes into contact with the stretch layer 112, and the lining material 10 is kept pressed against the inner wall and heated by the heating steam. Then, as described below, the supply of heating steam continues until the heating time determined in advance by an experiment has elapsed. Also, as soon as the supply of heating steam starts, the second compressor 383 is started, and the second air valve AH1 is fully opened to send outside air into the steam exhaust flow path 382a defined by the duct body 3821 (step S6). Note that, in step S5, the steam valve 311 may be opened to send out superheated steam from the boiler 31, and the heating steam may be supplied to the internal space IS. In that case, it is preferable to start the second compressor 383wp in step S5 to send outside air into the steam exhaust flow path 382a.

In this step S6, the heating steam supplied to the internal space IS on the median strip side of the lining material 10 flows through the internal space IS toward the steam exhaust pipe 3412 provided in the roadside plug member 341, gradually decreasing the temperature. Then, the steam exhausted from the steam exhaust pipe 3412 is sent to the silencer 381 through the exhaust hose CH. The steam that has passed through the silencer 381 flows through the steam exhaust flow path 382a of the exhaust duct 382, and is exhausted into the atmosphere from the exhaust port 382b after mixing with the outside air sent from the second compressor 383, or while being mixed with the outside air. Here, when the mixture of steam and outside air begins to be exhausted from the exhaust port 382b, the opening degree of the second air valve AH1 may be adjusted according to the state of the mixed gas, such as the color of the mixed gas and the sound of the steam being released. In addition, in step S6, the drain generated in the internal space IS is discharged to the outside of the lining material 10 through the piping equipped with the drain discharge pipe 37 and the valve 371 as described above.

Figure 5 is a graph roughly showing an example of the change in temperature of the heating steam supplied to the internal space of the lining material. In the graph shown in Figure 5, the horizontal axis represents time, and the vertical axis represents temperature (°C). The solid line graph roughly shows the temperature of the heating steam supplied to the internal space IS. The temperature here is the set temperature of the heating steam sent out from the mixing device 33, that is, the set temperature of the mixing device 33. Furthermore, at each of the shoulder side end and the median strip side end of the lining material 10, the temperature of the lining material 10 itself, more specifically, the temperature between the outer film layer 102 of the lining material 10 and the storm water drainage pipe D, is measured. However, the temperatures of the base layer 101, the base layer 111, the outer film layer 102 and the base layer 101, or the stretch layer 112 and the base layer 111 may be measured at each of both ends of the lining material 10. The temperature may be measured at the bottom of the lining material 10 or at the top of the lining material 10. The dashed and dotted line graph roughly represents the measured temperature at the end of the lining material 10 on the median strip side, and the dotted line graph roughly represents the measured temperature at the end of the lining material 10 on the shoulder side. Optical fibers may be installed along the entire length of the lining material 10 to measure the temperature of the lining material at multiple points and to control the temperature of the heating steam sent out from the mixing device 33.

The temperature change of the lining material 10 occurs with a delay relative to the temperature change of the heating steam supplied to the internal space IS. Furthermore, the temperature change of the lining material 10 at the end of the lining material 10 on the side of the road shoulder occurs with a delay relative to the temperature change at the end of the lining material 10 on the side of the median strip.

In the above-mentioned step S6, the steam valve 311 is opened, and the heating steam is first raised to about 80°C, and the heating steam at about 80°C is supplied to the internal space IS for a while. Since the thermosetting resin generates heat when curing, the temperature of the lining material 10 rises once and reaches a peak temperature (about 90°C in the example shown in FIG. 5), and then the temperature drops. The temperature of the thermosetting resin itself rises to a temperature exceeding 100°C at the peak of its own curing heat generation. In FIG. 5, the two-dot chain line represents the heat resistance temperature of the extension layer 112. The heat resistance temperature of the extension layer 112 is 120°C, and if the temperature of the thermosetting resin rises to this temperature, the extension layer 112 will melt. If high-temperature (e.g., 100°C) heating steam is supplied before the curing heat generation occurs, the curing heat generation may be superimposed and the temperature of the thermosetting resin may reach 120°C. For this reason, a slightly lower amount of heating steam is supplied in anticipation of the heat generated by curing until it occurs, so that the temperature of the thermosetting resin does not reach 120°C even if the heat generated by curing is superimposed.

On the other hand, after the curing heat is generated, the temperature of the lining material 10 is increased after it is detected that the temperature of the lining material 10 has changed from a temperature rise to a temperature drop. More specifically, after it is detected that the temperature of the lining material 10 has changed from a temperature rise to a temperature drop, and furthermore, when it is detected that the temperature of the lining material 10 has settled to an almost constant temperature, the set temperature of the mixing device 33 is increased from 80°C to 100°C. When the temperature of the lining material 10 changes from a temperature rise to a temperature drop and settles to an almost constant temperature, the curing of the thermosetting resin is completed to a sufficient level. From this state, the strength of the thermosetting resin can be increased by supplying heating steam at a higher temperature. In the example shown in FIG. 5, the temperature of the lining material 10 is heated to a temperature almost the same as the peak temperature. The temperature of the heating steam (the set temperature of the mixing device 33) can be determined according to the degree of strength improvement of the thermosetting resin. For example, if heating the lining material 10 to a temperature higher than the peak temperature (80°C) is expected to improve strength, it is preferable to heat it to a higher temperature within the range not exceeding the heat resistance temperature (120°C).

When the thermosetting resin is further heated by the heating steam with an increased temperature, the strength improvement ceases after a certain time, so the temperature of the heating steam to be increased and the heating time are determined in advance by experiment. The heating time can be 30 to 90 minutes. By continuing to supply the heating steam, the thermosetting resin impregnated in the base material layers 101, 111 hardens and increases in strength while the lining material 10 is pressed against the inner wall of the storm water drainage pipe D, the inner wall of the storm water drainage pipe D is lined by the lining material 10, and a new self-supporting pipe made of the lining material 10 is formed inside the inner wall of the storm water drainage pipe D.

Then, in step S7 shown in FIG. 4, the boiler 31 is stopped and the steam valve 311 is closed to supply outside air (room temperature air) instead of the heating steam and cool the hardened lining material 10.

Then, the pipe mouths of both ends of the lining material 10 are finished (step S8). In this pipe mouth finishing, the lining material 10 is cut to match the connection between the shoulder side catchment basin B1 and the center side catchment basin B2 at the shoulder side end and the center median side end of the storm water drainage pipe D, and the cut parts are cured.

Finally, the condition of the inner wall formed by the extension layer 112 of the lining material 10 is checked by a television camera for the final time (step S9), and the construction site is cleaned up (step S10), completing the entire process of lining the storm water drainage pipe D.

According to the exhaust device 38 and the pipe lining system 3 using the exhaust device 38 described above, outside air is added to the steam flowing through the steam exhaust flow path 382a, so the concentration of the steam exhausted from the exhaust port 382b becomes low. As a result, the steam exhausted from the exhaust port 382b becomes closer to transparent. In addition, the addition of outside air increases the release speed of the steam exhausted from the exhaust port 382b, and the exhausted steam is more likely to scatter upward. This prevents the exhausted steam from obstructing the visibility of drivers of vehicles passing by. Furthermore, the exhausted steam may be accompanied by the odor of the resin impregnated in the lining material 10, but the addition of outside air also reduces the odor. This reduces the impact of the exhausted steam on the surroundings.

In addition, the branch pipe 3822 is installed at an angle to the steam exhaust flow path 382a so as to approach the steam exhaust flow path 382a as it approaches the downstream side of the steam exhaust flow path 382a, so that the outside air sent from the second compressor 383 to the steam exhaust flow path 382a flows in the direction toward the exhaust port 382b in the steam exhaust flow path 382a. Therefore, this outside air does not hinder the flow of steam flowing downstream through the steam exhaust flow path 382a, and instead makes it easier for steam to flow downstream of the steam exhaust flow path 382a, promoting exhaust from the exhaust port 382b. As a result, it is easier to send new heating steam from the mixing device 33 to the internal space IS. Furthermore, since the branch pipe 3822 is connected to the duct main body 3821 at the downstream part of the steam exhaust flow path 382a, the position from the connection part to the exhaust port 382b is relatively close. As a result, the outside air sent from the second compressor 383 flows smoothly toward the exhaust port 382b where the flow resistance is reduced, and the outside air is prevented from impeding the movement of the steam flowing through the steam exhaust flow path 382a to the downstream side. As a result, it is easier to send new heating steam from the mixing device 33 to the internal space IS. In addition, since the exhaust duct 382 is connected to the silencer 381, the noise of the exhausted steam can be suppressed. Also, since the silencer 381 is located upstream of the exhaust duct 382, there is no risk that the outside air supplied from the second compressor 383 will stagnate in the silencer 381 without passing through the silencer 381 and obstruct the exhaust of the steam. Furthermore, because the exhaust duct 382 can be attached and detached to the silencer 381, for example, at a construction site where the effects of exhausted steam do not need to be considered, an exhaust duct 382 without a branch pipe 3822 can be connected to the silencer 381 for use, making it easy to respond flexibly to the environment of the construction site.

Next, modified examples of the exhaust device 38 will be described. In the following description, components that have the same names as components described so far will be assigned the same reference numerals as used so far, and duplicate descriptions may be omitted.

Figure 6(a) is a side view showing a modified example of the exhaust duct shown in Figure 3, and Figure 6(b) is a plan view of the exhaust duct shown in Figure 6(a).

6(a) and 6(b), the exhaust duct 382 of this modified example is different from the exhaust duct 382 shown in FIG. 3 in the connection position of the branch pipe 3822 to the duct body 3821. The branch pipe 3822 is connected to the duct body 3821 so that the outside air supplied by the second compressor 383 (see FIG. 2) and sent to the steam exhaust flow path 382a swirls along the inner circumferential surface 382c of the duct body 3821. Specifically, the branch pipe 3822 protrudes in the tangential direction of the inner circumferential surface 382c relative to the duct body 3821 when viewed from the longitudinal direction of the exhaust duct 382. As a result, the outside air supplied by the second compressor 383 is sent to the steam exhaust flow path 382a from the tangential direction of the inner circumferential surface 382c toward the downstream side of the steam exhaust flow path 382a.

The exhaust device 38 using the exhaust duct 382 of this modified example and the pipe lining system 3 using the exhaust device 38 also have the same effects as the previous embodiment. In addition, by using the exhaust duct 382 of this modified example, a swirling flow is created in the steam exhaust flow path 382a by the outside air sent from the second compressor 383. This swirling flow makes it easy for the steam flowing through the steam exhaust flow path 382a and the outside air sent from the second compressor 383 to mix together. In addition, since the mixed gas of the steam and the outside air is exhausted from the exhaust port 382b while swirling, the exhausted mixed gas is easily diffused in the atmosphere. This makes it possible to more reliably prevent the steam from obstructing the visibility of drivers of vehicles passing by. In addition, the odor of the steam becomes weaker as the mixed gas diffuses in the atmosphere.

The present invention is not limited to the embodiments and modifications described so far, and various modifications can be made within the scope of the claims. For example, in this embodiment, an example is used in which the exhaust device 38 is applied to the pipe lining system 3 that lines the storm water drainage pipe D that drains the storm water of the expressway HW, but the exhaust device 38 may be applied to the pipe lining system 3 that lines other pipes such as the storm water drainage pipe that drains the storm water of a general road, the sewer pipe that drains the sewage, and the underground electric wire pipe that houses the power cable. In addition, the pipe lining system 3 to which the exhaust device 38 in this embodiment is applied can be used not only for repairing existing pipes, but also for forming the inner surface of a new pipe. In addition, the lining material 10 in this embodiment can be in any form as long as it hardens when heated, and may be, for example, in a sheet form. Furthermore, the branch pipe 3822 may be installed so as to be connected at a right angle to the duct body 3821, or may be installed so as to be inclined at an angle of more than 90 degrees with respect to the steam exhaust flow path 382a so as to approach the steam exhaust flow path 382a toward the upstream side of the steam exhaust flow path 382a. However, in these installation modes, the outside air sent from the second compressor 383 to the steam exhaust flow path 382a flows into the steam exhaust flow path 382a in the opposite direction to the exhaust port 382b at a certain rate, so there is a risk that the flowing outside air will hinder the flow of steam flowing through the steam exhaust flow path 382a to the downstream side. On the other hand, since turbulence is generated in the steam exhaust flow path 382a, it is expected that the steam flowing through the steam exhaust flow path 382a and the flowing outside air will easily mix together. Furthermore, the branch pipe 3822 may be connected to the duct body 3821 at the upstream part of the steam exhaust flow path 382a. However, when connected in this manner, the distance from the connection to exhaust port 382b is relatively long, so compared to when connected at the downstream portion of steam exhaust flow path 382a, there is a risk that the outside air sent from second compressor 383 will not flow smoothly toward the downstream side of steam exhaust flow path 382a. On the other hand, because the distance from the connection to exhaust port 382b is long, it is expected that the outside air flowing into steam exhaust flow path 382a will be more likely to mix with the steam.

Note that even if a constituent element is included only in the description of each of the modified examples described above, that constituent element may be applied to other modified examples.

3 Pipe lining system 10 Lining material 38 Exhaust device (exhaust device for pipe lining)
381: Silencer 382: Exhaust duct 382a: Steam exhaust passage 382b: Exhaust port 383: Second compressor (outside air supply device)
3821 Duct body 3822 Branch pipe D Storm water drainage pipe

Claims (3)

an exhaust duct having a steam exhaust flow path formed therein through which steam flows that has heated a thermosetting resin impregnated in a lining material that lines a duct, and having an exhaust port at a downstream end of the steam exhaust flow path for exhausting the steam to the outside;
an outside air supply device that supplies outside air to the steam exhaust flow path ,
the exhaust duct has a duct body that defines the steam exhaust flow path, and a branch pipe that allows outside air supplied from the outside air supply device to flow into the steam exhaust flow path,
The duct body has an inner circumferential surface that is cylindrical,
The branch pipe causes the outside air supplied by the outside air supply device to flow into the steam exhaust flow path so as to swirl along the inner circumferential surface . 2. The exhaust system for lining a pipeline according to claim 1, wherein the branch pipe is connected to the duct body at a downstream portion of the steam exhaust flow path. A silencer is provided to suppress noise generated by steam exhausted from the exhaust port,
3. The exhaust system for lining a pipeline according to claim 1, wherein the exhaust duct is connected to the silencer.