JP4262875B2 - Pipe gate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipeline gate that opens and closes a pipeline by raising and lowering a membrane attached to the pipeline.
[0002]
[Prior art]
A flexible membrane is attached to a pipeline (a large tunnel-like one) that allows fluid such as water to pass, and the pipeline can be opened and closed by raising and lowering the flexible membrane. Many.
[0003]
Hereinafter, the prior art will be described by taking a gate provided in a water supply pipe having a ring-shaped cross section as an example.
[0004]
As shown in FIGS. 18 to 25, the pipe gate 200 provided in the pipe 202 having a ring-shaped cross section is a concrete base 204 (hereinafter referred to as a pad 204) provided on the bottom surface of the pipe 202. And a film body 208 provided on the upper surface of the pad 204.
[0005]
The pad 204 has a flat upper surface.
[0006]
The film body 208 includes a lower film 210 provided on the upper surface of the pad 204 and an upper film 212 provided on the lower film 210. The upstream end and the downstream end of the lower membrane 210 and the upper membrane 212 are attached to the pad 204 in a sealed state by an upstream attachment 216 and a downstream attachment 218, respectively. Further, both end portions in the width direction of the lower film 210 and the upper film 212 are attached to the side wall of the pipe line 202 in a sealed state by the width direction side attachment tool 220.
[0007]
Further, the conduit gate 200 has an air supply / exhaust system 221 that raises the upper film 212 by supplying air between the upper film 212 and the lower film 210 and exhausts the air to fall the upper film 212. Have. The supply / exhaust system 221 includes a pump (not shown), and the upper film 212 is erected and laid down by switching between intake and exhaust of the pump.
[0008]
By the way, after the pipe gate 200 is attached to the pipe line 202 (see the solid line in FIGS. 18 to 21), the upper film 212 is erected (see the two-dot chain line in FIGS. 18 to 21). When the body is laid down (see FIGS. 22 to 25), the upper film 212 is permanently stretched. For this reason, in the state of being laid down, a ridge 214 is formed on the upper membrane 212, and this ridge 214 causes a situation in which the effective cross-sectional area (water cross-sectional area) of the pipe line 202 decreases (see FIG. 25). It was.
[0009]
[Problems to be solved by the invention]
In view of the above fact, an object of the present invention is to provide a pipe gate that prevents the effective cross-sectional area of the pipe from being reduced even when the upper membrane is laid down.
[0010]
[Means for Solving the Problems]
In the first aspect of the present invention, the flexible upper membrane and lower membrane are fixed in a sealed state in a conduit, and a fluid is supplied between the upper membrane and the lower membrane so that the upper membrane is A pipeline that closes the pipeline by standing and discharges the fluid supplied between the upper membrane and the lower membrane and causes the upper membrane to fall, thereby opening the pipeline A pedestal provided on the bottom surface of the conduit, to which both ends of the upper membrane and the lower membrane in the length direction are fixed, and upstream ends of the upper membrane and the lower membrane, An upstream fixture that is fixed to the pedestal in a sealed state, a downstream fixture that fixes the downstream ends of the upper membrane and the lower membrane to the pedestal in a sealed state, and the widths of the upper membrane and the lower membrane Both ends in the width direction are fixed to the side walls of the pipe line in a sealed state, and fluid is supplied between the upper film and the lower film. Supply means, and discharge means for discharging the fluid between the upper film and the lower film, wherein a recess is formed between the upstream attachment tool and the downstream attachment tool. And
[0011]
After the pedestal is provided on the bottom surface of the pipeline, the lower membrane (the membrane located on the lower side) and the upper membrane (the membrane located on the upper side) are attached in the form of a flat sheet by the upstream upper fixture and the downstream fixture. . In this case, if the upper surface of the pedestal is flat, it is easy to attach the pedestal, the upper membrane and the lower membrane in a sealed state.
[0012]
After the upper membrane and the lower membrane are fixed to the pedestal and the pipeline side wall in a sealed state, when a fluid such as air is supplied between the upper membrane and the lower membrane by the supply means, the upper membrane rises and the pipeline is closed. Can be in a state.
[0013]
When the fluid supplied between the upper membrane and the lower membrane is discharged from the closed state by the discharge means, the upper membrane collapses and the pipeline is opened. At that time, since a recess is formed between the upstream fixture and the downstream fixture, even if permanent elongation occurs in the standing upper membrane, if the upper membrane is laid down, the upstream fixture The membrane body, that is, the upper membrane and the lower membrane sinks by its own weight between the outer attachment and the downstream fixture. Therefore, when viewed from the upstream side or the downstream side of the conduit, the film body is accommodated in the recess.
[0014]
Thereby, even if the upper membrane is laid down and a fluid such as water is allowed to pass through the pipeline, it is possible to avoid a reduction in the effective sectional area of the pipeline.
[0015]
The bottom surface of the pipe line may be curved. For example, the pipe cross section may be a ring shape or an egg cross section. In this case, the bottom shape of the pedestal is matched with the bottom surface of the pipeline.
[0016]
The invention according to claim 2 is characterized in that the recess is formed by two block-shaped pedestals arranged apart from each other so as to fix both end portions in the length direction of the upper film and the lower film. And
[0017]
Thereby, a hollow can be easily formed between the upstream fixture and the downstream fixture.
[0018]
The invention according to claim 3 is characterized in that the recess is formed by a recess provided between an upstream end and a downstream end of the pedestal.
[0019]
Thereby, when forming a hollow, a dimension can be adjusted easily and can be formed.
[0020]
In the invention according to claim 4, the difference between the length along the recess from the upstream fixture to the downstream fixture and the linear length from the upstream fixture to the downstream fixture Is made equal to the permanent stretch length generated in the upper film and the lower film by raising and lowering the upper film by supplying and discharging fluid by the supply means and the discharge means.
[0021]
Thus, when the upper membrane and the lower membrane are mounted in a plane by the upstream side fixture and the downstream side fixture, the upper membrane is raised and tilted to cause the upper membrane and the lower membrane to have a permanent extension length. The inferior membrane is supported by the wall of the depression. Therefore, since the tensile stress due to the weight of the film body, that is, the weight of the upper film and the lower film does not occur at the time of the fall, the durability of the film body is improved.
[0022]
The invention according to claim 5 is characterized in that the lower membrane is provided along the recess, and then the upper membrane is planarly attached by the upstream side fixture and the downstream side fixture.
[0023]
Thus, when the upper film is attached, even if the operator performs an installation operation on the lower film, there is no problem in the work or damage to the lower film.
[0024]
The invention according to claim 6 is characterized in that a corner of the pedestal on the recess side is rounded.
[0025]
The film body is easily damaged by sharp convex parts and concave parts. According to the sixth aspect of the present invention, the corner on the dent side of the pedestal is rounded, and no sharp convex part or concave part is formed. Even if the weight of the fluid is applied to the film body and the film body is pressed against the corner of the dent on the pedestal, the film body is not damaged.
[0026]
The invention according to claim 7 is characterized in that a drainage channel for draining the water accumulated in the depression is formed.
[0027]
If a fluid such as water is allowed to pass through the pipeline, the fluid such as water may enter from the upstream gap between the lower membrane and the pedestal. Further, for example, when the pipe is a tunnel, groundwater oozes out from a crack or the like generated on the wall surface forming the depression, and may enter between the bottom surface of the depression and the lower membrane.
[0028]
According to the seventh aspect of the present invention, the fluid that has entered between the lower membrane and the bottom surface of the depression can be discharged to the downstream side of the conduit gate.
[0029]
The invention according to claim 8 is characterized in that the recess is shaped like a mortar, and a drain outlet of the drainage channel is formed at the lowest end of the recess.
[0030]
Thereby, the fluid accumulated between the lower membrane and the bottom surface of the depression can be completely discharged.
[0031]
In a ninth aspect of the present invention, a flexible hose for draining water accumulated between the upper film and the lower film is connected to the lower film, and is formed in a drain hole formed in the bottom surface of the recess. The hose is inserted.
[0032]
It is very important to remove the drain in the film body, that is, to remove the drain between the upper film and the lower film. According to the eighth aspect of the present invention, even if the lower membrane moves when the conduit gate is used, the hose for draining is flexible so that the attachment port of the hose falls off from the lower membrane. Is avoided.
[0033]
The invention according to claim 10 is characterized in that a sliding portion for reducing sliding resistance with the hose is provided on an inner peripheral surface of the drain hole.
[0034]
As a result, the length of the hose to be inserted into the drain hole can be shortened in accordance with the displacement of the lower film in the direction of the drain hole. Therefore, even if the lower film moves in this direction, the hose The force applied to the mounting opening (such as a base) is greatly reduced, which is preferable in terms of durability.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described in detail with reference to embodiments.
[0036]
[First form]
The conduit gate according to the first embodiment will be described. As shown in FIGS. 1 to 7, the pipe gate 30 according to the first embodiment is a gate provided in a pipe line 32 having a cross-section in cross section, and is provided on the bottom surface of the pipe line 32. Block-shaped concrete pedestals 34A and B (hereinafter referred to as pads 34A and B) and film bodies 38 provided on the upper surfaces of the pads 34A and 34B.
[0037]
The pads 34 </ b> A and 34 </ b> B are pads provided on the upstream end portion and the downstream end portion of the film body 38, respectively, having a flat upper surface. Pads 34A and B seal a later-described lower membrane 40 constituting the film body 38 and the bottom surface of the conduit 32, and a recess 44 is formed between the pad 34A and the pad 34B. (See FIG. 2).
[0038]
The film body 38 includes a lower film 40 fixed on the upper surfaces of the pads 34 </ b> A and 34 </ b> B, and an upper film 42 fixed on the lower film 40. The upstream end and the downstream end of the lower membrane 40 and the upper membrane 42 are attached to the pads 34A and 34B in a sealed state by an upstream attachment 46 and a downstream attachment 48, respectively. Further, both end portions in the width direction of the lower film 40 and the upper film 42 are attached to the side wall of the pipe line 32 in a sealed state by the width direction side fittings 50.
[0039]
Further, the duct gate 30 has an air supply / exhaust system 43 for raising the upper film 42 by supplying air between the upper film 42 and the lower film 40 and exhausting the air to fall the upper film 42. Have. The air supply / exhaust system 43 includes a pump (not shown) capable of switching between intake and exhaust, and this pump is a pump having a head sufficient to raise the upper film 42.
[0040]
Further, a drainage channel 52 (see FIG. 2) is formed in the pad 34B so as to communicate with the recess 44 and the downstream side of the pad 34B. When the air is supplied by the air supply / exhaust system 43, the lower film 40 swells downward, so that the water accumulated between the lower film 40 and the bottom surface of the recess 44 is easily discharged from the drainage channel 52. As a result, when the lower membrane 40 swells downward, the pads 34A, B and the lower membrane 40 are prevented from being damaged by the water pressure applied to the water accumulated between the lower membrane 40 and the bottom surface of the depression 44. ing.
[0041]
A cantilevered lid 54 (see FIGS. 2, 8, and 9) is attached to the outlet side of the drainage channel 52. When water is drained from the drainage channel 52, the lid 54 is opened (FIG. 9). When the drainage is completed, the lid 54 is closed by its own weight (see FIG. 8). Therefore, dust or the like is prevented from entering the drainage channel 52.
[0042]
The operation of attaching the pipe gate 30 to the pipe 32 and opening and closing the pipe 32 by the air supply / exhaust system 43 will be described below.
[0043]
In order to attach the conduit gate 30 to the conduit 32, first, pads 34A and B are formed at predetermined positions of the conduit 32, respectively. The predetermined positions are the positions of the upstream end and the downstream end of the film body 38. Note that a drainage channel 52 is formed in the pad 34B when molding.
[0044]
Next, the lower film 40 and the upper film 42 are fixed to the upper surfaces of the pads 34A and 34B. At that time, the upstream end of the lower membrane 40 and the upper membrane 42 is sealed with the upstream attachment 46 and attached to the pad 34A. The downstream end is similarly attached by the downstream attachment 48. In this attachment, the lower film 40 and the upper film 42 are attached in a flat sheet state (see solid lines in FIGS. 1 to 4).
[0045]
When attaching the lower film 40 and the upper film 42, the pipe end of the air supply / exhaust system 43 is also attached to the lower film 40 or the upper film 42 (mainly the lower film 40).
[0046]
In order to close the pipe line 32 with the pipe gate 30, air is supplied by the air supply / exhaust system 43 and the upper film 42 is raised (see the two-dot chain line in FIGS. 1 to 4). The path 32 is closed.
[0047]
In order to open the pipe line 32 from this state, the air is exhausted by the air supply / exhaust system 43 and the upper film 42 is laid down (see FIGS. 3 and 4), so that the pipe line 32 is opened. To do.
[0048]
As a result, the upper film 42 and the lower film 40 remain permanently stretched, and even if the upper film 42 and the lower film 40 are stretched as compared with the time of attachment, only the stretched length is accommodated in the recess 44. The effective cross-sectional area (water flow cross-sectional area) of the pipe line 32 in a state where is open is sufficiently ensured.
[0049]
In the first embodiment, if the upper film 42 is attached along the recess 44, the tensile stress generated in the upper film 42 at the time of standing and the sagging state generated at the time of fall differ from those of the present embodiment and are required. Since the water pressure resistance cannot be sufficiently satisfied, it is preferable to attach the upper film 42 in the form of a flat sheet in the same manner as when the recess 44 is not provided.
[0050]
[Second form]
Next, the conduit gate according to the second embodiment will be described. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.
[0051]
As shown in FIGS. 10 to 13, the pipe gate 60 according to the second embodiment has a pad shape different from that of the first embodiment and includes a pad 64. The pad 64 is positioned between the upstream pad portion 64A corresponding to the pad 34A described in the first embodiment, the downstream pad portion 64B corresponding to the pad 34B, and the upstream pad portion 64A and the downstream pad portion 64B. And a recess 65 (see FIG. 11) is formed in the pad 64.
[0052]
The difference between the length from the upstream fixture 46 to the downstream fixture 48 along the recess 65 and the length from the upstream fixture 46 to the downstream fixture 48 when there is no recess 65 is The pad 64 is formed so as to be the same as the permanent extension length generated in the film body 68, that is, the upper film 72 and the lower film 70 by causing the air supply / exhaust means to flow in and out to raise and lower the upper film 72. Yes.
[0053]
The downstream pad portion 64B is formed with a drainage channel 74 that allows the recess 65 to communicate with the downstream side of the downstream pad portion 64B. As in the first embodiment, water accumulated in the recess 65 is formed by the lower membrane 70. When it swells, it is drained downstream.
[0054]
In order to attach the duct gate 60 to the duct 32, the upstream end of the upper membrane 72 and the lower membrane 70 is sealed with the upstream fitting 46 and attached to the upstream pad portion 64A (FIG. 10, FIG. 11 (see solid line). The downstream end portion is similarly attached. In this attachment, the lower film 70 and the upper film 72 are attached in the form of a flat sheet.
[0055]
Thereafter, when the upper film 72 is erected by the air supply / exhaust system 43 (see the two-dot chain line in FIGS. 10 and 11) and collapsed (see FIG. 12), and the upper film 72 and the lower film 70 are permanently stretched, Sometimes the upper film 72 and the lower film 70 are supported by the bottom surface of the recess 65.
[0056]
This prevents a tensile force due to its own weight from acting on the film body 68 (the upper film 72 and the lower film 70) when lying down, and the durability of the film body 68 is improved.
[0057]
In the first form, the length from the upstream fixture 46 to the downstream fixture 48 along the recess 65 is the length from the upstream fixture 46 to the downstream fixture 48 when it is assumed that there is no recess 65. 6% longer than that. On the other hand, in the second embodiment, this value is 3%, and the film body 68 is supported by the bottom portion 64C of the recess, that is, the bottom surface of the recess 65 when lying down.
[0058]
In addition, as shown in FIG. 13, the shape of the upper surface of the hollow bottom 77 may be a spherical concave shape or a ridge shape, and the drainage port 78 of the drainage channel may be provided at the lowermost portion of the spherical concave shape or the ridge shape. This facilitates drainage of the water accumulated between the lower film 79 and the upper surface of the hollow bottom 77, and the local stress acting on the film body 75 (the upper film 80 and the lower film 79) is reduced.
[0059]
[Third embodiment]
Next, the conduit gate according to the third embodiment will be described. As shown in FIG. 14, in the conduit gate according to the third embodiment, the corner portion 84E on the recess side of the upstream pad portion 84A of the pad 84 is rounded as compared with the second embodiment. In the third embodiment, the same components as those in the second embodiment are denoted by the same reference numerals and the description thereof is omitted.
[0060]
At the time of lodging, if water flows through the pipeline, the weight of the water is applied to the film body 68. In this embodiment, since the corner portion 84E is rounded, the lower membrane 70 is prevented from being damaged by the corner portion 84E when the weight of water is applied to the film body 68.
[0061]
[Fourth form]
Next, the conduit gate according to the fourth embodiment will be described. In the fourth embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0062]
As shown in FIG. 15, in the conduit gate 89 according to the fourth embodiment, a flexible hose 94 communicating between the upper film (not shown) and the lower film 92 is attached to the lower film 92 by a base 96. The hose 94 passes through a drain hole 98 formed in the recess bottom 64C and is connected to a drain discharge port (not shown). The hose 94 is a rubber hose or a bellows-like hose.
[0063]
As a result, even if water accumulates between the lower film 92 and the upper film, the water is drained from the hose 94. In addition, since the hose 94 is flexible (flexibility), the base 96 is detached from the lower film 92 even when the lower film 92 is repeatedly lifted and grounded with respect to the bottom 64C when the upper film rises and falls repeatedly. It is hard to do.
[0064]
In addition, as shown in FIG. 16, the sliding part 99 which the outer side of the hose 94 slides is formed in the opening part 98E of the hole 98 for drains, and the hose 94 may be cut | disconnected according to sliding length. .
[0065]
Thereby, when the hose 94 moves along the drain hole 98 following the movement of the lower film 92, it is possible to prevent a force for peeling from the lower film 92 from acting on the base 96.
[0066]
[Fifth embodiment]
Next, the conduit gate according to the fifth embodiment will be described. As shown in FIG. 17, in the conduit gate 100 according to the fifth embodiment, the pads 104 are the same as the upstream pad portion 104A and the downstream pad portion 104B, the upstream pad portion 104A and the downstream side as in the second embodiment. And a recess bottom portion 104C located between the pad portions 104B. The recess 104 is formed in the pad 104. In addition, compared with the 2nd form, it is not necessary to consider the length from the upstream fixture 46 to the downstream fixture 48 along the hollow 105.
[0067]
When the conduit gate 100 is attached to the conduit 32, the lower film 110 is formed of the side wall surface of the upstream pad portion 104A that forms the recess 105, the sidewall surface of the downstream pad portion 104B, the upper surface of the recess bottom portion 104C, and the tube. Install along the road wall. At the time of attachment, for example, the lower film 110 is attached by natural vulcanization using a film made of a thermosetting rubber, or the lower film 110 is attached by heat fusion using a film made of a thermosetting resin. At this time, it is easy to attach the lower film 110 by attaching the actual film.
[0068]
Thereby, when attaching the upper film | membrane 112, it is easy for an installation builder to perform an attachment operation | work on the lower film | membrane 110, and there is no possibility that the lower film | membrane 110 may be damaged during an attachment operation | work.
[0069]
【The invention's effect】
Since the present invention is configured as described above, a pipeline gate is realized in which the effective cross-sectional area of the pipeline is prevented from being reduced even when the upper membrane is laid down.
[Brief description of the drawings]
FIG. 1 is a perspective sectional view showing a state immediately after attachment of an upper film and a lower film (unused state) and a state where an upper film is raised in a conduit gate according to a first embodiment.
FIG. 2 is a side cross-sectional view showing a state immediately after attachment of an upper film and a lower film (unused state) and a state in which the upper film is raised in the duct gate according to the first embodiment.
FIG. 3 is a plan sectional view showing a pipe gate in a state immediately after attachment of an upper film and a lower film (unused state) and a state where the upper film is raised in the pipe gate according to the first embodiment; It is.
4 is a cross-sectional view taken along the line 4-4 in FIG.
FIG. 5 is a perspective sectional view showing a state after the upper film is erected and laid down in the duct gate according to the first embodiment.
FIG. 6 is a side sectional view showing a state after the upper film is erected and laid down in the duct gate according to the first embodiment.
7 is a cross-sectional view taken along the line 7-7 in FIG.
FIG. 8 is a side sectional view showing the discharge side of the drainage channel of the conduit gate according to the first embodiment (in a state where the drainage is not in progress).
FIG. 9 is a side sectional view showing the discharge side of the drainage channel of the conduit gate according to the first embodiment (in the state of drainage).
FIG. 10 is a perspective sectional view showing a state immediately after attachment of an upper film and a lower film (an unused state) and a state in which the upper film is raised in a duct gate according to a second embodiment.
FIG. 11 is a side cross-sectional view showing a state immediately after attachment of an upper film and a lower film (unused state) and a state where the upper film is raised in a duct gate according to a second embodiment.
FIG. 12 is a side cross-sectional view showing a state after the upper film is erected and laid down in the duct gate according to the second embodiment.
FIG. 13 is a side sectional view showing a modification of the conduit gate according to the second embodiment.
FIG. 14 is a partially enlarged side cross-sectional view showing the shape of a pad of a conduit gate according to a third embodiment.
FIG. 15 is a side cross-sectional view showing a drain gate hose attached to a lower membrane in a conduit gate according to a fourth embodiment.
FIG. 16 is a partially enlarged side sectional view showing a modification of the conduit gate according to the fourth embodiment.
FIG. 17 is a side cross-sectional view showing a state immediately after attachment of an upper film and a lower film (an unused state) and a state in which the upper film is raised in a duct gate according to a fifth embodiment.
FIG. 18 is a perspective cross-sectional view showing a state immediately after attachment of an upper film and a lower film (unused state) and a state where the upper film is raised in a conventional duct gate.
FIG. 19 is a side cross-sectional view showing a state immediately after attachment of an upper film and a lower film (unused state) and a state where the upper film is raised in a conventional duct gate.
FIG. 20 is a plan sectional view showing a state immediately after attachment of an upper film and a lower film (unused state) and a state where the upper film is raised in a conventional duct gate.
21 is a cross-sectional view taken along the arrow 21-21 in FIG.
FIG. 22 is a perspective sectional view showing a state after the upper film is erected and laid down with a conventional duct gate.
FIG. 23 is a side cross-sectional view showing a state after the upper film is erected and laid down with a conventional duct gate.
FIG. 24 is a plan sectional view showing a state after the upper film is erected and laid down with a conventional duct gate.
25 is a cross-sectional view taken along the line 25-25 in FIG.
[Explanation of symbols]
30 Pipe gate 32 Pipe 34A, B Pad 40 Lower membrane 42 Upper membrane 43 Air supply / exhaust system 44 Recess 46 Upstream fixture 48 Downstream fixture 50 Width direction fixture (width direction both ends fixing means)
52 Drainage channel 54 Lid 60 Pipe gate 64 Pad 64A Upstream pad unit 64B Downstream pad unit 65 Recess 70 Lower film 72 Upper film 74 Drainage channel 78 Lower film 80 Upper film 84 Pad 84A Upstream pad unit 84E Corner 89 Pipe gate 92 Lower membrane 94 Hose 98 Drain hole (Drain drain hole)
98E opening (inner peripheral surface)
99 Sliding part 100 Pipe gate 104 Pad 104A Upstream pad part 104B Downstream pad part 105 Recess 110 Lower film 112 Upper film 200 Pipe gate 202 Pipe line 204 Pad 210 Lower film 212 Upper film 216 Upstream fixture 218 Downstream side fixture 220 Width direction side fixture (width direction both ends fixing means)
221 Supply / exhaust system

Claims (10)

A flexible upper membrane and lower membrane are fixed in a sealed state in a pipeline, and a fluid is supplied between the upper membrane and the lower membrane to erect the upper membrane to close the pipeline. A gate for a pipeline that opens the pipeline by discharging the fluid supplied between the upper membrane and the lower membrane and causing the upper membrane to fall down,
A pedestal provided on the bottom surface of the conduit, to which both ends in the length direction of the upper membrane and the lower membrane are fixed;
An upstream fixture for fixing the upstream end of the upper membrane and the lower membrane to the pedestal in a sealed state;
A downstream fixture for fixing the downstream end of the upper membrane and the lower membrane to the pedestal in a sealed state;
Width direction both ends fixing means for fixing the width direction both ends of the upper film and the lower film to the side wall of the conduit in a sealed state;
Supply means for supplying a fluid between the upper film and the lower film;
A discharge means for discharging a fluid between the upper film and the lower film,
A conduit gate, wherein a recess is formed between the upstream fixture and the downstream fixture. 2. The tube according to claim 1, wherein the recess is formed by two block-shaped pedestals arranged to be separated from each other so as to fix both longitudinal ends of the upper film and the lower film. Road gate. 2. The conduit gate according to claim 1, wherein the recess is formed by a recess provided between an upstream end and a downstream end of the pedestal. The difference between the length along the recess from the upstream fixture to the downstream fixture and the linear length from the upstream fixture to the downstream fixture is defined as the supply means and the discharge means. 4. The conduit gate according to claim 3, wherein a fluid is supplied and discharged to make the upper film stand up and lie down to equal the permanent extension length generated in the upper film and the lower film. The lower film is provided along the recess, and then the upper film is mounted in a planar manner by the upstream mounting tool and the downstream mounting tool. A conduit gate according to claim 1. The pipe gate according to any one of claims 1 to 5, wherein a corner of the pedestal on the recess side is rounded. The conduit gate according to any one of claims 1 to 6, wherein a drainage channel for draining water accumulated in the depression is formed. 8. The conduit gate according to claim 7, wherein the recess has a mortar shape, and a drain outlet of the drain channel is formed at a lowermost end portion of the recess. A flexible hose that drains water accumulated between the upper film and the lower film is connected to the lower film, and the hose is inserted into a drain hole formed in the bottom surface of the recess. The conduit gate according to any one of claims 1 to 8, wherein the conduit gate is characterized by the following. 10. The conduit gate according to claim 9, wherein a sliding portion for reducing sliding resistance with the hose is provided on an inner peripheral surface of the drain extraction hole.

Images