Exhaust device for pipe lining

Abstract

To provide an exhaust system for pipe lining that suppresses an effect of steam being exhausted.SOLUTION: An exhaust system 38 for pipe lining of the present invention includes: an exhaust duct 382 having an exhaust port 382b for exhausting steam to an outside at a downstream end of a steam exhaust channel 382a through which steam heating a thermosetting resin impregnated in a lining material 10 lining a rainwater drainage pipe D flows is formed inside; and a second compressor 383 that feeds outside air into the steam exhaust channel 382a.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an exhaust device for lining a pipeline for exhausting steam obtained by heating a lining material.

Background Art

[0002] Some of the pipelines such as buried rainwater drainage pipelines and sewer pipelines are damaged due to aging, ground settlement, or fluctuations in ground pressure. When repairing damaged pipelines, it is preferable to perform the repair without excavation from the viewpoints of reducing repair costs and minimizing traffic obstacles.

[0003] Therefore, as a non-excavation repair method for pipelines, various techniques have been proposed in which a cylindrical lining material impregnated with a thermosetting resin is pressed against the inner peripheral wall of the pipeline, and the inner peripheral wall is lined with the lining material (see, for example, Patent Document 1). Further, even when a new pipeline is newly buried, the inner peripheral wall of the newly buried pipeline may be lined with a lining material.

[0004] In the pipeline lining technique proposed in Patent Document 1, high-temperature air heated by a heating means is sent into the inside of the lining material. By this high-temperature air, the lining material is heated while being pressed against the inner surface of the pipeline, and the curing of the thermosetting resin of the lining material proceeds. Then, by continuing the supply of the high-temperature air for a predetermined time, after the curing of the thermosetting resin of the lining material is completed, the strength of the cured thermosetting resin can be improved. After the supply of the high-temperature air, the lining material is cut and the cut pipe ends are finished as necessary.

[0005] By the way, in order to efficiently supply heat to the lining material, high-temperature steam is also sometimes sent into the inside of the lining material. Even when using high-temperature steam, the steam is sequentially sent into the inside of the lining material until the curing of the thermosetting resin impregnated in the lining material and the improvement of its strength are completed. Then, the steam that has been deprived of a certain amount of heat by passing through the inside of the lining material is exhausted from an exhaust duct provided on the ground. When the steam is exhausted near a road, since the exhausted steam is cloudy, there is a risk of obstructing the visibility of drivers of vehicles passing by, etc. As a countermeasure against this, it has been proposed to extend the exhaust duct to a high position (see, for example, Patent Document 2, etc.).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, simply raising the exhaust duct alone may cause the exhausted steam floating around to descend to near the ground due to its own weight or wind, etc., and in that case, there is a risk of obstructing the visibility of drivers of vehicles passing by, etc.

[0008] In view of the above circumstances, the present invention aims to provide an exhaust device for pipeline lining that suppresses the influence of the exhausted steam.

Means for Solving the Problems

[0009] The exhaust device for pipeline lining of the present invention that solves the above problems is There is formed inside an exhaust duct having a steam discharge passage through which steam heated by a thermosetting resin impregnated in a lining material for lining a pipeline flows, and an exhaust port for exhausting the steam to the outside at the downstream end of the steam discharge passage, and an outside air supply device for sending outside air into the steam discharge passage, wherein the exhaust duct has a duct body defining the steam discharge passage and a branch pipe for allowing the outside air supplied from the outside air supply device to flow into the steam discharge passage, the duct body has a cylindrical inner peripheral surface, and the branch pipe is configured to allow the outside air supplied by the outside air supply device to flow into the steam discharge passage so as to swirl along the inner peripheral surface. Also, There is formed inside an exhaust duct having a steam discharge passage through which steam heated by a thermosetting resin impregnated in a lining material for lining a pipeline flows, and an exhaust port for exhausting the steam to the outside at the downstream end of the steam discharge passage, and characterized by comprising an outside air supply device for sending outside air into the steam discharge passage. it may be.

[0010] According to the exhaust device for pipeline lining of the present invention, since outside air is added to the steam flowing through the steam discharge passage, the concentration of the steam exhausted from the exhaust port becomes lower. Thereby, it is possible to suppress the exhausted steam from obstructing the view.

[0011] Also, in the exhaust device for pipeline lining of the present invention, the exhaust duct has a duct body that defines the steam discharge passage and a branch pipe that allows outside air supplied from the outside air supply device to flow into the steam discharge passage, and the branch pipe may be installed inclined with respect to the steam discharge passage so as to approach the steam discharge passage as it goes toward the downstream side in the steam discharge passage.

[0012] According to this exhaust device for pipeline lining, since the outside air supplied from the outside air supply device flows into the steam discharge passage in the direction toward the exhaust port, the inflowing outside air flows downstream together with the steam flowing through the steam discharge passage, and the exhaust is promoted. As a result, it becomes easier to send new high-temperature steam inside the lining material.

[0013] Here, the branch pipe may be connected to the duct body. Also, the branch pipe may be for sending outside air toward the downstream side in the steam discharge passage. 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.

[0014] Furthermore, in the exhaust device for lining the pipeline of the present invention, The branch pipe may be connected to the duct main body at a downstream portion in the steam discharge flow path.

[0015] According to this exhaust device for lining the pipeline, the outside air sent from the outside air supply device is likely to go toward the exhaust port in the relatively near vicinity and is less likely to flow backward upstream, so it is possible to suppress the outside air from becoming a resistance to the downstream flow of the steam in the steam discharge flow path. Also by this, it becomes easier to send new high-temperature steam inside the lining material.

[0016] Moreover, in the exhaust device for lining the pipeline of the present invention, The duct main body has a cylindrical inner peripheral surface, The branch pipe may be configured to allow the outside air supplied by the outside air supply device to flow into the steam discharge flow path so as to swirl along the inner peripheral surface.

[0017] According to this exhaust device for lining the pipeline, a swirling flow is created in the steam discharge flow path by the outside air supplied from the outside air supply device, and the steam flowing through the steam discharge flow path swirls while mixing with the outside air and heads toward the exhaust port. And since the steam is exhausted from the exhaust port while swirling, the exhausted steam is likely to diffuse. By these, since the concentration of the exhausted steam becomes thinner, it is possible to further suppress the exhausted steam from obstructing the view.

[0018] Here, the branch pipe may be configured to send the outside air supplied by the outside air supply device into the steam discharge flow path from the tangential direction on the inner peripheral surface as viewed from the longitudinal direction of the exhaust duct.

[0019] Also, in the exhaust device for lining the pipeline of the present invention, It is provided with a sound silencing device for suppressing the noise of the steam discharged from the exhaust port, The exhaust duct may be connected to the sound silencing device.

[0020] The noise of the exhausted steam can be suppressed by the silencing device. Here, the exhaust duct may be detachably connected to the silencing device.

Advantages of the Invention

[0021] According to the present invention, it is possible to provide an exhaust device for lining a pipeline that suppresses the influence of exhausted steam.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, an example of applying the exhaust device for lining a pipeline of the present invention to a pipeline lining system for lining a rainwater drainage pipeline that is buried under the road surface of a highway and flows rainwater on the highway between the shoulder side and the median strip side will be used for explanation.

[0024] FIG. 1 is a perspective view showing an embodiment of a lining material used for lining a pipeline.

[0025] The lining material 10 shown in FIG. 1 is a sleeve-shaped material used when lining the inner peripheral wall of a rainwater drainage pipeline D (see FIG. 2) buried in the ground. FIG. 1 shows a state where the sleeve-shaped lining material 10 is flattened. This lining material 10 is an integrated structure of two sleeve-shaped lining materials, namely a base hose 100 and a calibration hose 110. Hereinafter, the radially outer side of the lining material 10 is simply referred to as the outer side, and the radially inner side is simply referred to as the inner side. The base hose 100 is located on the outer side of the calibration hose 110. The calibration hose 110 is thinner than the base hose 100.

[0026] The base hose 100 has a base material layer 101 and an outer film layer 102. The base material layer 101 shown in FIG. 1 is a polyester non-woven fabric. Note that the base material layer 101 is not limited to polyester, and may be a non-woven fabric made of an organic fiber material such as nylon, acrylic, or vinylon, or a woven fabric made of such an organic fiber material, or a non-woven fabric or a woven fabric made of an inorganic fiber material such as carbon fiber or glass fiber. Furthermore, it may be a combination of an organic fiber material and an inorganic fiber material.

[0027] The base material layer 101 shown in FIG. 1 is impregnated with a compound. The compound impregnated in the base material layer 101 is mainly composed of a vinyl ester (epoxy acrylate) resin. Note that instead of the vinyl ester resin, an unsaturated polyester resin, a urethane acrylate resin, or the like may be used. The vinyl ester resin is a type of thermosetting resin that is crosslinked by a radical polymerizable monomer. The compound contains a crosslinking agent, a viscosity modifier, a filler, a curing agent (such as a peroxide), and various additives.

[0028] The outer film layer 102 covers the base material layer 101 from the outside and has a function of suppressing the leakage of the compound impregnated in the base material layer 101 to the outside. That is, the outer film layer 102 is water-impermeable. 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, instead of polyethylene, other polyolefins such as polypropylene may be used, and furthermore, a single-layer structure instead of a laminated structure may also be used.

[0029] The calibration hose 110 has a base material layer 111 and an extension layer 112. The base material layer 111 of the calibration hose 110 shown in FIG. 1 is also a polyester nonwoven fabric, similar to the base material layer 101 of the base hose 100. Note that this base material 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 fabric or woven fabric made of an inorganic fibrous material such as carbon fiber or glass fiber, and furthermore, a combination of an organic fibrous material and an inorganic fibrous material may also be used.

[0030] The base material layer 111 of the calibration hose 110 shown in FIG. 1 is also impregnated with a compound. The compound used for the calibration hose 110 is also mainly composed of a thermosetting resin. As the thermosetting resin here, a thermosetting resin selected from unsaturated polyester, epoxy (meth)acrylate, urethane (meth)acrylate, and unsaturated polyester acrylate can be used. This compound also contains a crosslinking agent, a viscosity modifier, a filler, a curing agent (such as peroxide), various additives, and the like.

[0031] The extension layer 112 is made of polyurethane that forms the innermost peripheral surface of this lining material 10 and has excellent extensibility. That is, it has better extensibility than the outer film layer 102 of the base hose 100.

[0032] Next, a method for manufacturing the lining material shown in FIG. 1 will be described. The method described here is carried out in a factory.

[0033] First, prepare an appropriate material suitable for the pipeline to be lined. The materials prepared here include a base hose 100 without impregnated compound and a calibration hose 110 also without impregnated compound. These hoses (100, 110) are in the form of sleeves cut to a length corresponding 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 inside the outer film layer 102. On the other hand, in the calibration hose 110, an extension layer 112 is located on the outside and a base material layer 111 is located inside the extension layer 112. That is, it is in a state opposite to the state of the calibration hose 110 shown in FIG. 1.

[0034] Also, a base agent for the base hose, a filler, a curing agent (such as peroxide), and various additives that are the basis for the compound impregnated in the base hose 100 are prepared. The base agent for the base hose prepared here has a vinyl ester, which is a thermosetting resin, as the main component (50% by weight or more). Also, a crosslinking agent and a viscosity modifier are used in the compound. Furthermore, silica as a thixotropic agent, cobalt naphthenate as a curing accelerator, and a polymerization inhibitor, etc. are also used in the base agent for the base hose.

[0035] Also, a base agent for the calibration hose, a filler, a curing agent, and various additives that are the basis for the compound impregnated in the calibration hose 110 are prepared. The base agent for the calibration hose also has a thermosetting resin as the main component. A methacrylic acid ester is also used as a crosslinking agent and a viscosity modifier in the compound for the calibration hose.

[0036] Next, resin mixing is performed. Here, the main agent for the base hose, the filler, the hardener, and various additives are mixed to prepare the compound for the base hose. Also, the main agent for the calibration hose, the filler, the hardener, and various additives are mixed to prepare the compound for the calibration hose.

[0037] Subsequently, the prepared compound for the base hose is impregnated into the base material layer 101 of the base hose 100. Also, the prepared compound for the calibration hose is impregnated into the base material layer 111 of the calibration hose 110. The base material layer 101 of the base hose 100 is impregnated with the compound to saturation, and the base material layer 111 of the calibration hose 110 is impregnated with the compound to supersaturation. That is, the impregnation rate of the compound is made higher in the base material layer 111 of the calibration hose 110 than in the base material layer 101 of the base hose 100. In this way, the base hose 100 impregnated with the compound and the calibration hose 110 with the base material layer 111 impregnated with the compound located inside are prepared separately. Note that the base material layer 101 of the base hose 100 may be impregnated with the compound to supersaturation, and the base material layer 111 of the calibration hose 110 may be impregnated with the compound to saturation.

[0038] Next, the calibration hose 110 is reversely inserted inside the base hose 100 impregnated with the compound. In the reverse insertion, the calibration hose 110 with the base material layer 111 positioned on the inside is inserted inside the base hose 100 while being turned inside out so that the base material layer 111 comes to the outside. The calibration hose 110 is inserted inside the base hose 100 from one end side of the base hose 100 and is reversely inserted by the force of air or water. Since the calibration hose 110 is thinner than the base hose 100, the reverse insertion is easily performed. By reversely 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, and the lining material 10 in which the two sleeve-shaped members, namely 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 constituted by the outer film layer 102 and its innermost surface is constituted by the extension layer 112, and between the outer film layer 102 and the extension layer 112, the base material layers 101, 111 impregnated with the thermosetting resin are arranged. Thereafter, a steam supply tube 36 (see FIG. 2) for supplying steam for heating the lining material 10 is inserted inside the extension layer 112.

[0039] The completed lining material 10 is flattened, zigzag folded, and stored at a low temperature in a folded state. Note that the completed lining material 10 may be stored at a low temperature in a wound state. The lining material 10 stored at a low temperature is transported to the construction site by a cold storage vehicle in a folded state or a wound state.

[0040] Next, each device of the pipeline lining system 3 will be described.

[0041] FIG. 2 is a cross-sectional view schematically showing a state in which the pipe lining system is used and the lining material shown in FIG. 1 is used for lining. FIG. 2 shows a state in which the pipe lining system 3 is installed on the shoulder side of a two-lane highway HW. Also shown in FIG. 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. Although FIG. 2 shows the rainwater drainage pipe D extending horizontally, the rainwater drainage pipe D is actually slightly inclined so that the median strip side is lower than the shoulder side in order to allow rainwater to flow down to the median strip side. Conversely, there may be a case where rainwater flows down to the shoulder side. In that case, the rainwater drainage pipe D is slightly inclined so that the shoulder side is lower than the median strip side.

[0042] As shown in FIG. 2, on the highway HW, there are formed a side ditch G, a shoulder side catch basin B1, a center side catch basin B2, a rainwater drainage pipe D, and a drain pipe P. The side ditch G extends along the shoulder of the highway HW. Rainwater that has fallen on the highway HW flows into the side ditch G. The shoulder side catch basins B1 are scattered at predetermined intervals in the extending direction of the highway HW. The shoulder side catch basin B1 is a catch basin for collecting rainwater that has flowed into the side ditch G. The center side catch basins B2 are also scattered at predetermined intervals in the extending direction of the highway HW. The rainwater drainage pipe D is made of concrete and connects the shoulder side catch basin B1 and the center side catch basin B2 under the road surface of the highway HW and is buried underground. This rainwater drainage pipe D corresponds to an example of a pipe. By the rainwater drainage pipe D, the rainwater collected in the shoulder side catch basin B1 flows down to the center side catch basin B2. The drain pipe P is a pipe for draining the rainwater that has flowed down to the center side catch basin B2 to the outside of the highway HW. FIG. 2 shows a state in which a plurality of cracks C1 to C4 have occurred in the rainwater drainage pipe D. Also shown in FIG. 2 is a state in which the rainwater drainage pipe D is lined with the lining material 10 over its entire length. Note that in FIG. 2, the sizes of the shoulder side catch basin B1, the center side catch basin B2, and the rainwater drainage pipe D are exaggerated.

[0043] The pipe-lining system 3 includes a boiler 31, a first compressor 32, a mixing device 33, a shoulder-side jig 34, a supply hose SH, an exhaust hose CH, a central-side jig 35, a steam supply tube 36, a drain discharge pipe 37, and an exhaust device 38. This pipe-lining system 3 is installed at the construction site to line the rainwater drainage pipe D.

[0044] The boiler 31, the first compressor 32, and the mixing device 33 are mounted on a boiler vehicle (not shown) parked on the ground. For example, superheated steam heated to exceed 100°C is sent out from the boiler 31. Note that the steam sent out from the boiler 31 may be saturated steam. The first compressor 32 and the mixing device 33 are also on the ground and installed near the boiler 31. The first compressor 32 compresses and sends out outside air (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 gas mixture of superheated steam and 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 operating the steam valve 311 and the first air valve 321 to adjust the throttle amount, the temperature of the heating steam sent out from the mixing device 33 can be adjusted, or the flow rate of the heating steam can be adjusted.

[0045] The shoulder-side jig 34 is disposed near the lower end of the shoulder-side water collecting tray B1. The shoulder-side jig 34 includes a shoulder-side plug member 341, a shoulder-side clamping member 342, and a tube clamping member 343. The shoulder-side plug member 341 has a steam supply pipe 3411 and a steam discharge pipe 3412, and has a cylindrical shape with the end face on the shoulder side closed except for the inside of the pipes of the steam supply pipe 3411 and the steam discharge pipe 3412. The steam supply pipe 3411 and the steam discharge pipe 3412 penetrate the closed end face on the shoulder side and are fixed to the end face. In the state of supplying heating steam 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 clamped to the outer peripheral surface of the cylindrical portion of the shoulder-side plug member 341 by the shoulder-side clamping member 342. Also, in the state of supplying heating steam, the shoulder-side end of the steam supply tube 36 is fixed to the steam supply pipe 3411 by being clamped to the outer peripheral surface of the steam supply pipe 3411 by the tube clamping member 343.

[0046] The supply hose SH is a hose with one end connected to the mixing device 33 and the other end connected to the steam supply pipe 3411 of the shoulder-side plug member 341. Also, the exhaust hose CH is a hose with one end connected to the steam discharge pipe 3412 of the shoulder-side plug member 341 and the other end connected to a silencing device 381 (described later) of the exhaust device 38. An exhaust valve CH1 for adjusting the flow rate of the fluid flowing in the exhaust hose CH is provided in the middle of the exhaust hose CH. The heating steam that has been heated to a certain extent by heating the lining material 10 is discharged from the steam discharge pipe 3412 and flows into the exhaust hose CH. Hereinafter, the heating steam that has completed its heating role and is discharged from the steam discharge pipe 3412 is simply referred to as steam.

[0047] The central jig 35 is disposed near the lower end of the central water collecting trough B2. This 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 openings at both ends. In the state of supplying heating steam shown in Fig. 2, both the central end of the lining material 10 and the central end of the steam supply tube 36 are clamped to the outer peripheral surface of the central fastening drum 351 by the central fastening member 352. Note that, instead of using the central fastening drum 351, it is also possible to simply tie together the central end of the lining material 10 and the shoulder side end of the steam supply tube 36. However, by using the central fastening drum 351, it becomes possible to firmly clamp 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 clamping 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 those central ends. Note that, as the lining material 10, one with the central end pre-closed may be used. Similarly, as the steam supply tube 36, one with the central end pre-closed may be used.

[0048] As described above, in the state where the steam supply tube 36 supplies heating steam shown in FIG. 2, the shoulder side end portion is fixed to the steam supply pipe 3411, and the central side end portion is fixed to the central fastening drum 351. Thus, the steam supply tube 36 extends from the shoulder side water collecting trough B1 to the central side water collecting trough B2 inside the lining material 10. In other words, the steam supply tube 36 extends over the entire length of the rainwater 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 is provided with round holes 362 having a diameter of about 1 cm at intervals of 1 m from the shoulder side toward the central separation strip side, and further, a slit hole 361 is provided in the vicinity of the central side water collecting trough B2 closest to the central separation strip side. The slit hole 361 has, for example, a width of 1 to 2 cm and a length of about 10 cm to 20 cm. In FIG. 2, the slit hole 361 and the round holes 362 are drawn relatively large. As shown in FIG. 2, the slit hole 361 and the round holes 362 are arranged in a row in the extending direction of the rainwater drainage pipe D, and the round holes 362 and the slit hole 361 are also arranged in a row in the extending direction of the rainwater drainage pipe D on the 180-degree opposite side in the circumferential direction of the steam supply tube 36. The heating steam sent into the steam supply tube 36 from the mixing device 33 through the supply hose SH and the steam supply pipe 3411 blows out from the slit hole 361 and the round holes 362.

[0049] The drain discharge pipe 37 is inserted near the central separation strip side end portion of the lining material 10. In FIG. 2, for the sake of illustration, the drain discharge pipe 37 is drawn as being inserted into the upper portion of the lining material 10, but actually, the drain discharge pipe 37 is inserted into the lower end portion of the lining material 10. The heating steam is deprived of a certain amount of heat by the lining material 10, and thus a part of it changes into drain in the internal space IS of the lining material 10. A pipe provided 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.

[0050] The exhaust device 38 includes a silencing device 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 silencing device 381, a space with a cross-sectional area larger than that of the exhaust hose CH is formed. Also, a sound-absorbing material is arranged inside the silencing device 381. The heating steam carries sound waves such as the boiling sound of the boiler 31, and there may also be cases where sound is generated when the heating steam passes through each part. The silencing device 381 silences these sounds.

[0051] The exhaust duct 382 is detachably connected to the silencing device 381. Inside the exhaust duct 382, a steam discharge flow path 382a (see FIG. 3) through which steam flows is formed. The exhaust duct 382 has an exhaust port 382b for exhausting the steam that has passed through the steam discharge flow path 382a to the outside. The configuration of this exhaust duct 382 will be described in detail later.

[0052] The second compressor 383 compresses and sends out outside air (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. A second air valve AH1 is provided in the air supply hose AH. By operating this second air valve AH1 to adjust the throttle amount, the flow rate of the outside air sent into the steam discharge flow path 382a can be adjusted.

[0053] FIG. 3(a) is a front view showing the exhaust duct shown in FIG. 2, and FIG. 3(b) is a cross-sectional view taken along line A-A of the exhaust duct shown in FIG. 3(a).

[0054] As shown in FIGS. 3(a) and 3(b), the exhaust duct 382 has a duct main body 3821 and a branch pipe 3822. The duct main body 3821 extends in the vertical direction, and the inner peripheral surface 382c has a cylindrical shape. Note that the duct main body 3821 is composed of a thin metal plate, and the outer peripheral surface also has a cylindrical shape. An exhaust port 382b is formed at the upper end of the duct main body 3821. Further, 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 main body 3821. Although not shown, a notch 382e having the same shape is also formed on the opposite side of the duct main body 3821 in the circumferential direction by 180 degrees. The silencer 381 is provided with a protruding portion (not shown) having an outer circumference substantially the same diameter as the inner circumference of the duct main body 3821 and protruding upward. A pair of bosses protruding in the circumferential direction are formed on the protruding portion. By fitting the pair of bosses into the pair of notches 382e of the duct main body 3821 and rotating the exhaust duct 382 by a predetermined angle with its extending direction as the rotation center direction, the exhaust duct 382 is detachably connected to the silencer 381. As shown in FIG. 3(b), a steam discharge passage 382a whose downstream end is the exhaust port 382b is formed inside the duct main body 3821. The steam silenced by the silencer 381 flows into the steam discharge passage 382a through the above-described protruding portion provided in the silencer 381.

[0055] The branch pipe 3822 is connected to the duct main body 3821 in the middle of the extending direction of the duct main body 3821 and at the downstream portion in the steam discharge flow path 382a. In other words, the branch pipe 3822 is connected to the duct main body 3821 at a position close to the exhaust port 382b, which is at the downstream end rather than the upstream end in the steam discharge flow path 382a defined by the duct main body 3821. The branch pipe 3822 can also be said to be a confluent pipe that merges into the duct main body 3821. The branch pipe 3822 is installed at an angle of 45 degrees with respect to the steam discharge flow path 382a so as to approach the steam discharge flow path 382a as it goes downstream in the steam discharge flow path 382a. This inclination angle is preferably 15 degrees or more and 75 degrees or less. As shown in FIG. 3(b), a joint port 382d is formed at the joint portion between the duct main body 3821 and the branch pipe 3822. As shown in FIG. 2, an air supply hose AH extending from the second compressor 383 is connected to the protruding end of the branch pipe 3822. Thereby, the outside air supplied from the second compressor 383 is sent into the steam discharge flow path 382a from the joint port 382d through the inside of the air supply hose AH and the inside of the branch pipe 3822. As described above, the inclination angle of the branch pipe 3822 with respect to the steam discharge flow path 382a is preferably 15 degrees or more and 75 degrees or less. If this inclination angle is less than 15 degrees, it takes time until the steam flowing in the steam discharge flow path 382a and the outside air supplied from the second compressor 383 and sent into the steam discharge flow path 382a are mixed in the steam discharge flow path 382a. For this reason, there is a risk that a part of the steam may be exhausted from the exhaust port 382b without being mixed. Further, if the inclination angle of the branch pipe 3822 exceeds 75 degrees, the effect of promoting the downstream flow of the steam flowing in the steam discharge flow path 382a is weakened, and there is a risk that a part of the outside air sent into the steam discharge flow path 382a may flow backward and inhibit the flow of the steam flowing in the steam discharge flow path 382a.

[0056] Next, a pipeline lining method for lining the rainwater drainage pipeline D with the pipeline lining system 3 using the lining material 10 described so far will be described.

[0057] FIG. 4 is a flowchart showing the process of lining a rainwater drainage pipe at a construction site using the pipe lining system shown in FIG. 2.

[0058] At the construction site, first, construction preparations are made (step S1). Here, the lane on the shoulder side of the highway is closed to traffic, and the lining material 10 is transported to the construction site by a refrigerated truck. Next, the inside of the rainwater drainage pipe D is cleaned, and an inspection of the rainwater drainage pipe D is carried out using a television camera running inside the rainwater drainage pipe D (step S2). By this inspection, damage locations in the rainwater drainage pipe D are confirmed, etc.

[0059] Subsequently, the lining material 10 is drawn into the rainwater drainage pipe D together with the steam supply tube 36 inserted inside (step S3). The lining material 10 is drawn into the rainwater drainage pipe D from the refrigerated truck through the shoulder side catch basin B1 together with the steam supply tube 36. Here, first, a winch is installed near the entrance of the central side catch basin B2, the rear end of the wire wound around the winch is inserted into the central side catch basin B2, and the wire is passed through to the shoulder side catch basin B1. Then, the leading end portion of the lining material 10 is tied together with the leading end portion of the steam supply tube 36 at the rear end portion of the wire, and the wire is wound up by the winch to draw the lining material 10 into the rainwater drainage pipe D to be lined together with the steam supply tube 36. When the wire is wound up until the leading end portions of the lining material 10 and the steam supply tube 36 come out from the connection portion of the rainwater drainage pipe D to be lined with the central side catch basin B2, the winch is stopped and the drawing-in is completed. At the time of completion of the drawing-in, the end portions of the lining material 10 and the steam supply tube 36 on the median strip side are out of the rainwater drainage pipe D and into the central side catch basin B2. On the other hand, the shoulder side end of the lining material 10 is not drawn into the rainwater drainage pipe D and remains in the shoulder side catch basin B1.

[0060] Next, set the lining material 10 inside the rainwater drainage pipe D (step S4). In this setting, first, remove the wire that binds the lining material 10 and the tip portion of the steam supply tube 36. Then, press the end of the lining material 10 and the steam supply tube 36 on the central separation zone side against the central fastening drum 351 and fasten it to the central fastening drum 351 with the central fastening member 352. As a result, the ends of the lining material 10 and the steam supply tube 36 on the central separation zone side are sealed. Also, fit the steam supply pipe 3411 into the road shoulder side end of the steam supply tube 36 and fasten it with the tube fastening member 343 from the outer peripheral side of the steam supply tube 36. Further, fit the cylindrical portion of the road shoulder side plug member 341 into the road shoulder side end of the lining material 10 and fasten it with the road shoulder side fastening member 342 from the outer peripheral side of the lining material 10. As a result, the road shoulder side between the lining materials 10 is also sealed, and only the steam supply pipe 3411 and the steam discharge pipe 3412 to which the steam supply tube 36 is connected are in a state of connecting the inside and outside of the lining material 10.

[0061] In addition, in step S4, park a boiler truck near the entrance of the road shoulder side water collecting tray B1 instead of the refrigerated truck. As a result, the first compressor 32, the mixing device 33, and the exhaust device 38 are in a state of being installed on the ground. Also, install the exhaust device 38 on the ground. Then, connect one end of the supply hose SH to the mixing device 33 and the other end to the steam supply pipe 3411 of the road shoulder side plug member 341. Also, connect one end of the exhaust hose CH to the steam discharge pipe 3412 of the road shoulder side plug member 341 and the other end to the silencer 381 of the exhaust device 38.

[0062] Once the above preparations are complete, fully open the exhaust valve CH1 and start the first compressor 32, and start supplying outside air to the mixing device 33, the supply hose SH, the steam supply pipe 3411, and the steam supply tube 36. As a result, the steam supply tube 36 bulges into a cylindrical shape, and outside air begins to blow out from the slit holes 361 and the round holes 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 has bulged, the amount of outside air blown out from the slit holes 361 and the round holes 362 increases, and the internal space IS is filled with the blown-out outside air. Then, when the exhaust valve CH1 is gradually closed, the lining material 10 bulges and expands in diameter. When the lining material 10 has bulged sufficiently, the outer film layer 102 of the lining material 10 is pressed against the inner peripheral wall of the rainwater drainage pipe D. Check the pressing state (pressure) of the lining material 10 against the rainwater drainage pipe D, and adjust the opening degree of the exhaust valve CH1 so as to achieve an appropriate pressing state (step S5).

[0063] Subsequently, open the steam valve 311 to send out superheated steam from the boiler 31, mix the superheated steam with outside air from the first compressor 32 in the mixing device 33, and start supplying it to the internal space IS. At this time, by adjusting the opening degree of the steam valve 311, the temperature of the heating steam sent out from the mixing device 33 is adjusted. Also, if necessary, adjust the opening degrees of the first air valve 321 and the exhaust valve CH1 to adjust the flow rate of the heating steam sent out from the mixing device 33 and the pressing pressure on the rainwater drainage pipe D of the lining material 10. 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 in detail later. The sent-out heating steam blows out into the internal space IS from the slit holes 361 and round holes 362, contacts the extension layer 112, and the lining material 10 is maintained in a state of being pressed against the inner peripheral wall and heated by the heating steam. Then, continue to supply the heating steam until the heating time obtained in advance by experiments, as described later, elapses. Also, immediately after starting the supply of the heating steam, start the second compressor 383, fully open the second air valve AH1, and send outside air into the steam discharge flow path 382a defined by the duct body 3821 (step S6). Note that at the stage of step S5, the steam valve 311 may be opened to send out superheated steam from the boiler 31 and supply the heating steam to the internal space IS. In that case, it is preferable to start the second compressor 383 at the stage of step S5 and send outside air into the steam discharge flow path 382a.

[0064] 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 discharge pipe 3412 provided in the shoulder side plug member 341, and its temperature gradually decreases. Then, the steam discharged from the steam discharge pipe 3412 is sent into the silencer 381 through the exhaust hose CH. The steam that has passed through the silencer 381 flows through the steam discharge flow path 382a of the exhaust duct 382, and after mixing with the outside air sent from the second compressor 383, or while mixing, it is exhausted into the atmosphere from the exhaust port 382b. Here, when the mixed gas of steam and outside air starts to be exhausted from the exhaust port 382b, the opening degree of the second air valve AH1 may be adjusted according to the state such as the color of the mixed gas and the discharge sound of the steam. In addition, the drain generated in the internal space IS in this step S6 is discharged to the outside of the lining material 10 through the drain discharge pipe 37 and the pipe provided with the valve 371 as described above.

[0065] FIG. 5 is a graph roughly showing an example of changes in the temperature etc. of the heating steam supplied to the internal space of the lining material. In the graph shown in this FIG. 5, the horizontal axis represents time, and the vertical axis represents temperature (°C). Also, the solid line graph roughly represents 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. Further, at each of the shoulder side end portion and the median strip side end portion 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 rainwater drainage pipe D is measured. However, at each of both ends of the lining material 10, the temperature between the base material layer 101, the base material layer 111, the outer film layer 102 and the base material layer 101 or between the extension layer 112 and the base material layer 111 may be measured. In addition, the temperature at the bottom of the lining material 10 may be measured or the temperature at the top of the lining material 10 may be measured. The one-dot chain line graph roughly represents the measured temperature at the median strip side end portion of the lining material 10, and the dotted line graph roughly represents the measured temperature at the shoulder side end portion of the lining material 10. Note that an optical fiber may be installed over the entire length of the lining material 10, the temperature of the lining material may be measured at a plurality of locations, and the temperature management of the heating steam sent out from the mixing device 33 may be performed.

[0066] With respect to the temperature change of the heating steam supplied to the internal space IS, the temperature change of the lining material 10 occurs with a delay. Further, with respect to the temperature change at the median strip side end portion of the lining material 10, the temperature change at the shoulder side end portion of the lining material 10 occurs with a delay.

[0067] In the above step S6, the steam valve 311 is opened, and first, the heating steam is raised to about 80°C, and for a while, the heating steam at about 80°C is supplied to the internal space IS. Since the thermosetting resin generates heat during curing, the temperature of the lining material 10 once rises and reaches the peak temperature (about 90°C in the example shown in FIG. 5), and then the temperature decreases. The temperature of the thermosetting resin itself rises to a temperature exceeding 100°C at the peak of its own heat generation during curing. In FIG. 5, the heat-resistant temperature of the extension layer 112 is represented by a two-dot chain line. The heat-resistant temperature of the extension layer 112 is 120°C, and when the temperature of the thermosetting resin rises to this temperature, the extension layer 112 will melt. If heating steam at a high temperature (for example, 100°C) is supplied before heat generation during curing occurs, the heat generated during curing may be superimposed, and the temperature of the thermosetting resin may reach 120°C. Therefore, until heat generation during curing occurs, heating steam slightly lower than normal is supplied in anticipation of the heat generated during curing, so that the temperature of the thermosetting resin does not reach 120°C even when the heat generated during curing is superimposed.

[0068] On the other hand, after heat generation during curing occurs, after detecting that the temperature of the lining material 10 has changed from a temperature rise to a temperature drop, the temperature of the heating steam is increased. More specifically, after detecting that the temperature of the lining material 10 has changed from a temperature rise to a temperature drop, and further detecting that the temperature of the lining material 10 has dropped to a substantially 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 has changed from a temperature rise to a temperature drop and has dropped to a substantially constant temperature, the curing of the thermosetting resin is completed to a sufficient level. From this state, by supplying heating steam at a higher temperature, the strength of the thermosetting resin can be increased. In the example shown in FIG. 5, the temperature of the lining material 10 is heated to a temperature substantially the same as the peak temperature. Note that the temperature of the heating steam (the set temperature of the mixing device 33) may be determined according to the degree of improvement in the strength of the thermosetting resin. For example, when it is expected that the strength can be improved by heating the lining material 10 to a temperature higher than the peak temperature (80°C), it is preferable to heat it to a higher temperature within a range not exceeding the above heat-resistant temperature (120°C).

[0069] When continuously heating the thermosetting resin with heated steam at an elevated temperature, if the time exceeds a certain period, there will be no change in strength improvement. Therefore, both the temperature of the heated steam for increasing the temperature and the heating time should be determined in advance through experiments. The heating time can be 30 minutes to 90 minutes. By continuously supplying the heating steam, the lining material 10 is pressed against the inner peripheral wall of the rainwater drainage pipe D, and the thermosetting resin impregnated in the base material layers 101 and 111 hardens and increases in strength. The inner peripheral wall of the rainwater drainage pipe D is lined with the lining material 10, and a new self-supporting pipe is formed by the lining material 10 inside the inner peripheral wall of the rainwater drainage pipe D.

[0070] Then, in step S7 shown in FIG. 4, the boiler 31 is stopped and the steam valve 311 is closed to supply outside air (normal temperature air) instead of the heating steam to cool the cured lining material 10.

[0071] Thereafter, the pipe ends of both ends of the lining material 10 are finished (step S8). In this pipe end finishing, at the shoulder side end and the median strip side end of the rainwater drainage pipe D respectively, the lining material 10 is cut according to the connection parts with the shoulder side water collecting trough B1 and the central side water collecting trough B2, and the cut parts are cured.

[0072] Finally, the state of the inner peripheral wall formed by the extension layer 112 of the lining material 10 is finally confirmed by a TV camera (step S9), the construction site is cleaned up (step S10), and all the processes of lining the rainwater drainage pipe D are completed.

[0073] According to the exhaust device 38 described above and the pipeline lining system 3 using the exhaust device 38, since outside air is added to the steam flowing through the steam discharge channel 382a, the concentration of the steam exhausted from the exhaust port 382b becomes thinner. For this reason, the steam exhausted from the exhaust port 382b becomes closer to being transparent. Also, the addition of outside air increases the discharge speed of the steam exhausted from the exhaust port 382b, and the exhausted steam is more likely to scatter upward. By these means, it is possible to suppress the exhausted steam from obstructing the vision of a driver of a vehicle passing by in the vicinity. Furthermore, although the odor of the resin impregnated in the lining material 10 may be added to the exhausted steam, the addition of outside air also weakens the odor. By these means, the influence of the exhausted steam on the surroundings is suppressed.

[0074] In addition, since the branch pipe 3822 is installed to be inclined with respect to the steam discharge passage 382a so as to approach the steam discharge passage 382a as it goes downstream in the steam discharge passage 382a, the outside air sent from the second compressor 383 to the steam discharge passage 382a flows into the steam discharge passage 382a in the direction toward the exhaust port 382b. For this reason, this outside air does not hinder the downstream flow of the steam flowing through the steam discharge passage 382a. On the contrary, the steam can easily flow downstream in the steam discharge passage 382a, so that the exhaust from the exhaust port 382b is promoted. As a result, it becomes easier to send fresh heating steam from the mixing device 33 into the internal space IS. Further, since the branch pipe 3822 is connected to the duct main body 3821 at the downstream portion in the steam discharge passage 382a, the distance from the connection portion to the exhaust port 382b is relatively short. Thereby, the outside air sent from the second compressor 383 can smoothly flow toward the exhaust port 382b with less flow resistance, so that it is suppressed that the outside air hinders the downstream movement of the steam flowing through the steam discharge passage 382a. As a result, it becomes easier to send more fresh heating steam from the mixing device 33 into 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. Further, 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 stagnates in the silencer 381 without passing through the silencer 381 and inhibits the exhaust of the steam. Furthermore, since the exhaust duct 382 is detachable from the silencer 381, for example, at a construction site where the influence of the exhausted steam does not need to be considered, it becomes easy to make a flexible response according to the environment of the construction site, such as connecting and using an exhaust duct 382 without the branch pipe 3822 to the silencer 381.

[0075] Subsequently, a modified example of the exhaust device 38 will be described. In the following description, the same components as those described so far may be denoted by the same reference numerals as those used so far, and duplicate descriptions may be omitted.

[0076] FIG. 6(a) is a side view showing a modified example of the exhaust duct shown in FIG. 3, and FIG. 6(b) is a plan view of the exhaust duct shown in FIG. 6(a).

[0077] As shown in FIGS. 6(a) and 6(b), in the exhaust duct 382 of this modified example, the connection position of the branch pipe 3822 to the duct main body 3821 is different from that of the exhaust duct 382 shown in FIG. 3. The branch pipe 3822 is connected to the duct main body 3821 such that the outside air supplied by the second compressor 383 (see FIG. 2) and sent into the steam discharge passage 382a swirls along the inner peripheral surface 382c of the duct main body 3821. Specifically, the branch pipe 3822 protrudes in the tangential direction on the inner peripheral surface 382c with respect to the duct main body 3821 when viewed from the longitudinal direction of the exhaust duct 382. Thereby, the outside air supplied by the second compressor 383 is sent into the steam discharge passage 382a from the tangential direction on the inner peripheral surface 382c toward the downstream side in the steam discharge passage 382a.

[0078] Also in the exhaust device 38 using the exhaust duct 382 of this modified example and the pipeline lining system 3 using the exhaust device 38, the same effects as those of the previous embodiment are achieved. Moreover, by using the exhaust duct 382 of this modified example, a swirling flow is created in the steam discharge passage 382a by the outside air sent from the second compressor 383. Due to the swirling flow, the steam flowing through the steam discharge passage 382a and the outside air sent from the second compressor 383 are likely to mix. Further, since the mixed gas in which the steam and the outside air are mixed is exhausted while swirling from the exhaust port 382b, the exhausted mixed gas is likely to diffuse in the atmosphere. As a result, it is possible to more reliably prevent the steam from obstructing the view of a driver of a vehicle passing by, etc. Also, the smell of the steam becomes weaker as the mixed gas diffuses in the atmosphere.

[0079] The present invention can be variously modified within the scope described in the claims without being limited to the embodiments and modifications described so far. For example, in this embodiment, an exhaust device 38 is applied to the pipe lining system 3 that underlies the rainwater drainage pipe D that drains rainwater from the highway HW. However, this exhaust device 38 may be applied to a pipe lining system 3 that underlies other pipes such as a rainwater drainage pipe that drains rainwater from a general road, a sewer pipe that drains sewage, and an underground cable pipe that houses a power cable. Further, 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 peripheral surface of newly installed pipes. Note that the lining material 10 in this embodiment may have any form as long as it hardens by heating, and may be, for example, in the form of a sheet. Furthermore, the branch pipe 3822 may be installed so as to be connected to the duct main body 3821 at a right angle, or may be installed so as to be inclined at more than 90 degrees with respect to the steam discharge passage 382a so as to approach the steam discharge passage 382a as it goes upstream in the steam discharge passage 382a. However, in these installation modes, since the outside air sent from the second compressor 383 into the steam discharge passage 382a flows into the steam discharge passage 382a in the direction opposite to the exhaust port 382b at a certain rate, there is a risk that the inflowing outside air may hinder the downstream flow of the steam flowing through the steam discharge passage 382a. On the other hand, since a turbulent flow is generated in the steam discharge passage 382a, it can be expected that the steam flowing through the steam discharge passage 382a and the inflowing outside air will easily mix. Furthermore, the branch pipe 3822 may be connected to the duct main body 3821 at the upstream portion in the steam discharge passage 382a. However, when connected in this way, since the distance from the connection portion to the exhaust port 382b becomes relatively long, there is a risk that the outside air sent from the second compressor 383 will not flow smoothly toward the downstream side of the steam discharge passage 382a as compared with the case where it is connected at the downstream portion in the steam discharge passage 382a. On the other hand, since the distance from the connection portion to the exhaust port 382b becomes long, it can be expected that the outside air flowing into the steam discharge passage 382a will easily mix with the steam.

[0080] Even constituent elements included only in the descriptions of the respective modification examples described above may be applied to other modification examples.

Description of Reference Numerals

[0081] 3 Pipeline Lining System 10 Lining Material 38 Exhaust Device (Exhaust Device for Pipeline Lining) 381 Silencing Device 382 Exhaust Duct 382a Steam Discharge Flow Path 382b Exhaust Port 383 Second Compressor (Outside Air Supply Device) 3821 Duct Body 3822 Branch Pipe D Rainwater Drainage Pipeline

Claims

1. An exhaust duct having a steam discharge passage formed therein through which heated steam impregnating a lining material for lining a pipeline flows, and having an exhaust port at the downstream end of the steam discharge passage for exhausting the steam to the outside; an outside air supply device for feeding outside air into the steam discharge passage; the exhaust duct having a duct body defining the steam discharge passage and a branch pipe for allowing the outside air supplied from the outside air supply device to flow into the steam discharge passage; the duct body having a cylindrical inner peripheral surface; the branch pipe allowing the outside air supplied by the outside air supply device to flow into the steam discharge passage so as to swirl along the inner peripheral surface, characterized in that it is an exhaust device for pipeline lining.

2. The exhaust device for pipeline lining according to Claim 1, characterized in that the branch pipe is connected to the duct body at a downstream side portion in the steam discharge passage.

3. An exhaust device for pipeline lining according to Claim 1 or 2, further comprising a silencing device for suppressing the noise of the steam discharged from the exhaust port; the exhaust duct being connected to the silencing device.

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