JP7551963B1 - Flood prevention system and flood prevention method - Google Patents

Abstract

At least in a road or passageway leading to a site or building and used by vehicles and people, a continuous sheet storage groove (2) including a waterproof sheet fixing portion (3b) is dug, the sheet storage groove is covered with an openable and closable lid portion (10), and a lifting portion (4c) to which the upper end of the waterproof sheet (3) is fixed is provided on a support (4) and which can be moved up and down by a drive portion, and under normal circumstances, the waterproof sheet is stored in the sheet storage groove, and the lifting portion is in the stored position so that vehicles and people can pass over the lid covering the sheet storage groove, and in the event of flooding, the lifting portion rises from the stored position, the lid opens and the waterproof sheet is pulled up from the sheet storage groove, and the lifting portion moves to the usage position so that the upper part of the waterproof sheet is fixed to the multiple supports.

Description

The present invention relates to a flood control system and a flood control method.

Conventionally, as disclosed in Patent Document 1, for example, a flood prevention device that forms a waterproof wall equipped with posts and a waterproof sheet is known as a flood prevention device for covering a building or site.

As shown in Patent Document 2, a water-blocking device is known which includes a number of cylindrical underground buried members buried almost vertically in the ground and support members inserted coaxially so as to be able to freely rise and fall, with a dam plate inserted between adjacent support members and a pressing means attached to the upper ends of the support members pressing the dam plate against the ground to block water, and which is laid in large numbers over the entire land of a house to form a water-blocking device.

Furthermore, as disclosed in Patent Document 3, a flood prevention device is known in which a flexible wall (waterproof sheet) is stored in a trench (groove section) and a support pole is stored sideways in the same trench, and in the event of a risk of flooding, the support pole is raised and supported by a receiver.

As disclosed in Patent Document 4, a waterproofing device that uses posts and a waterproof sheet to form a waterproof wall on a river bank, for example, a waterproofing device that uses guardrail posts or a fence, is known.

Furthermore, as disclosed in Patent Documents 5 and 6, flood prevention devices equipped with a water stop plate or a mechanism for raising and lowering a waterproof sheet are known to prevent water from entering through gates at the entrance to a building or the entrance to a staircase leading to an underground passage during flooding.

JP 2008-88791 A Patent No. 2886123 Patent No. 6676707 JP 2017-141601 A JP 2014-227721 A JP 2012-82590 A

However, the device in Patent Document 1 does not have any supports or waterproof sheets under normal circumstances, so there are no problems with entering or exiting the site or building, but in the event of flooding, the supports and waterproof sheets must be brought in from their storage locations, and it takes a very long time to install the supports, form the waterproof sheets, and seal them with the side walls. For this reason, it is only effective on a small scale in preventing river flooding caused by sudden heavy rain, or flooding under or above the floor caused by inland sewage overflow, and there is a problem that installing it over a wide area, such as along rivers or around factories, takes too much time and the installation work of the waterproofing device itself is dangerous.

The device in Patent Document 2 requires a large space to store many barrier plates. Furthermore, since the installation of many barrier plates and tightening with a pressing means must be carried out over a wide area of the site or building to be enclosed, particularly along rivers or around factories, it takes a lot of time to install the flood prevention devices, and dangerous work must be carried out for long periods of time in the event of an emergency when the water level rises.

In the case of the device in Patent Document 3, the support poles are placed sideways together with the waterproof sheet in the same groove and supported by a receiver, so most of the water pressure during floods is applied to the support poles. In addition, the support parts of the support poles, which are subject to large loads, are shallow and structurally incapable of withstanding large loads, so the support poles must be supported from the side opposite the water by a receiver, which is a separate component from the support poles, resulting in problems with time-consuming installation.

In the case of Patent Document 4, there are no guardrails or fences on the bridges over rivers for vehicles and pedestrians to pass over, so waterproof walls cannot be installed, and there is a problem that the system cannot be used to prevent flooding on rivers with many bridges, such as small rivers and irrigation channels in urban areas.

The devices in Patent Documents 5 and 6 function to prevent water from entering through narrow gates, but are not suitable for preventing flooding caused by widespread river flooding due to recent torrential rains. In particular, the device in Patent Document 5 has a watertight structure in which the waterproof sheet and the support are sealed only by contact with the support due to bending of the waterproof sheet, and cannot prevent water from entering even under high water pressure.

In addition, in the case of Patent Document 6, while the posts and waterproof sheet are already designed to have a robust watertight structure, the zipper part that closes when the waterproof sheet is pulled up is weaker than the main body of the sheet, and there are problems in that it cannot withstand high water pressure, and the zipper gets caught when the waterproof sheet is raised, making it impossible to close.

The present invention has been made in consideration of these points, and its purpose is to make it possible to normally maintain passable areas on roads and passageways used by vehicles and pedestrians, but to quickly install flood barriers including such areas in the event of a sudden rise in water level, thereby preventing flooding of the site or building to be protected.

In order to achieve the above object, this invention provides a waterproof sheet that is normally stored in the area leading to a road or passageway so that people can walk on it, and in the event of flooding, the waterproof sheet is automatically pulled up by a lifting section provided on the support.

Specifically, in the first invention,
a waterproof sheet fixing portion that is continuously installed along the site or building to be protected;
A waterproof sheet having a lower end fixed to the waterproof sheet fixing portion and continuously covering the site or building;
A plurality of posts are provided in the vicinity of the waterproof sheet fixing portion and support the waterproof sheet,
The waterproof sheet has a lower end that can be fixed to the waterproof sheet fixing portion, and an upper end that can be pulled up and fixed to the upper portions of the plurality of supports,
A flood prevention system in which a waterproof wall is continuously formed by the waterproof sheet when the waterproof sheet is pulled up and fixed to the upper part of the plurality of supports,
At least on roads or passageways leading to the site or building and through which vehicles and people pass,
A sheet storage groove portion that is continuously dug and includes the waterproof sheet fixing portion;
a cover that can be opened and closed to cover the sheet storage groove,
The support pole has a lifting part to which the upper end of the waterproof sheet is fixed and which can be moved up and down by a drive part,
In a normal state, the waterproof sheet is stored in the seat storage groove, and the lifting section is in a storage position, allowing vehicles and people to pass over the lid section that covers the seat storage groove,
When flooded, the lifting section rises from the storage position, the lid opens to pull the waterproof sheet out of the sheet storage groove, and the lifting section moves to the usage position so that the upper part of the waterproof sheet is fixed to the multiple supports.

According to the above configuration, under normal circumstances, when vehicles or people pass through the passage leading to the entrance and exit of the site or building, the waterproof sheet stored in the sheet storage groove is covered with the lid, so it does not interfere with the passage. Then, in the event of flooding, the waterproof sheet is first pulled up in an area that is not part of the road or passage and its upper part is fixed to the support, so that the road or passage can be used to enter or exit the site or building until just before flooding occurs. Finally, the lifting part is raised by the drive part in the road or passage, the waterproof sheet is pulled up and the lid part is opened, the lifting part is set to the use position and the waterproof sheet is fixed to the upper part of the support, so that a waterproof wall that continuously covers the site or building can be quickly completed without transporting the waterproof sheet from the storage place. Here, "site" means not only the site of a building such as a house or factory, but also includes the wall part of a river, lake, coastal embankment, or bank where there is no embankment.

In a second aspect of the present invention, in the first aspect of the present invention,
The support pole is erected on the site or building side of the waterproof sheet fixing portion and outside the traffic area of the road or passageway.

According to the above configuration, the support posts are erected outside the passage area, so they do not impede passage. In addition, because the support posts are installed on the side of the object to be protected rather than the waterproof sheet fixing part, the waterproof sheet is stretched at an angle from the top of the support posts toward the waterproof sheet fixing part. In addition, part of the water pressure applied to the waterproof sheet is applied to the waterproof sheet fixing part as a tensile load, so the load on the support posts is reduced.

In a third aspect of the present invention, in the first or second aspect of the present invention,
The site is a levee along a river, a lake, or a coast, and the waterproof sheet fixing portion is provided along the levee,
The road leads to a bridge.

According to the above configuration, under normal circumstances, the waterproof sheet stored in the sheet storage groove is covered by the lid, allowing vehicles and people to pass along the road leading to the bridge. In the event of flooding, the lifting unit is operated to pull up the waterproof sheet and open the lid, and the lifting unit is set in the usage position and the waterproof sheet is fixed to the top of the support pillars, completing a continuous waterproof wall including the road leading to the bridge, making it possible to waterproof the embankment. Here, "embankment" generally refers to a structure made of earth and stone or concrete built along a river bank, lake bank, or coast to prevent flooding of rivers or lakes and intrusion of seawater, but it also includes the wall of a bank that does not have an embankment, such as a small river flowing through an urban area.

In a fourth aspect of the present invention, in the first or second aspect of the present invention,
The waterproof sheet fixing portion is provided around the site or building,
The passage leads to an entrance or exit of the site or building,
When flooding occurs, the waterproof sheet is pulled up and folded at the portion of the support pillar at the corner of the site or building and fixed to the top of the support pillar, so that the waterproof sheet forms a continuous waterproof wall.

According to the above configuration, under normal circumstances, when vehicles or people pass through the passage leading to the entrance and exit of the site or building, the waterproof sheet stored in the sheet storage groove is covered with the lid, so it does not interfere with the passage. Then, in the event of flooding, the waterproof sheet is first pulled up in an area that is not part of the passage and its upper part is fixed to the support, so that the passage can be used to enter or exit the site or building until just before flooding occurs. Finally, the lifting part is driven to pull up the waterproof sheet and open the lid part, and the lifting part is set in the use position to fix the waterproof sheet to the upper part of the support, so that the surroundings of the site or building have corners that are bent at the support parts at the corners of the site or building in a plan view, completing a continuous waterproof wall. Therefore, it is possible to prevent flooding by simply pulling the waterproof sheet up from the sheet storage groove, without having to carry it from a storage location, and to appropriately cover the parts of the site or building that need protection very quickly and easily.

In a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention,
In the portion where there is no road or passage, the support is a fixed support that does not have the lifting part,
When flooded, the waterproof sheet is pulled up and the upper part is fixed to the fixed pole.

According to the above configuration, if the parts that do not impede passage are fixed posts without lifting parts, there is no need to provide lifting parts for all the posts, resulting in a simple and inexpensive configuration. In the event of flooding, the waterproof sheet can be simply pulled up and fixed to the fixed posts, so there is no need to bring in posts and the waterproof sheet can be easily installed. The fixed posts can also be used as a fence to cover a site or building.

In a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention,
The lid portion is fixed to the lifting portion and configured to move up and down together with the lifting portion.

According to the above configuration, when in use, the drive unit is operated and the lid rises and opens together with the lifting unit, eliminating the need to manually open or remove the lid. When storing, the waterproof sheet is folded and the lifting unit lowers the lid and closes it again, making storage easy.

In a seventh aspect, in any one of the first to sixth aspects,
The cover portion is connected to the upper end of the waterproof sheet, thereby serving as a reinforcing member for the waterproof sheet,
When the lid portion is lifted by the lifting portion, a continuous waterproof wall is formed by the waterproof sheet.

According to the above configuration, when the drive unit is driven to raise the lifting unit, the waterproof sheet is lifted at the same time as the lid unit. Also, since the lid unit also serves as a reinforcing member, the upper end of the waterproof sheet is less likely to bend and its strength is increased compared to when there is no reinforcing member, and the height of the waterproof wall can also be increased.

In an eighth aspect of the present invention, in any one of the first to sixth aspects,
The lid portion is configured to be lifted by the waterproof sheet that is pulled out by the lifting portion.

According to the above configuration, when the lifting section is raised, the lid section is automatically lifted along with the waterproof sheet, eliminating the need to open the lid section manually, making it extremely easy to install the waterproof wall.

In a ninth aspect, in any one of the first to sixth aspects,
A beam member is integrally provided on the waterproof sheet, and the beam member constitutes a reinforcing member of the waterproof sheet,
By supporting the beam member across a plurality of supports, a continuous waterproof wall is formed by the waterproof sheet.

According to the above configuration, the waterproof sheet is supported via the beam members that are integral with the waterproof sheet, so compared to when there are no beam members, the upper end of the waterproof sheet is less likely to bend, increasing its strength and allowing the waterproof wall to be made taller. In addition, because the beam members are supported by multiple supports, the load applied to the waterproof sheet can be dispersed.

In a tenth aspect, in any one of the first to sixth aspects,
A pipe member or a bag-sealing portion is provided on the upper portion of the waterproof sheet,
A wire is passed through the pipe member or the sealed portion,
The tarpaulin is suspended from the posts via the wires.

With the above configuration, by pulling the wire, the pipe member or sealed portion through which the wire passes is pulled up, and one side of the waterproof sheet is pulled up. This makes it easy and reliable to install a waterproof wall, even with a heavy waterproof sheet. In addition, because the wire passes through the rigid pipe member or sealed portion, the upper end of the waterproof sheet is less likely to bend when the wire is wound up with a winch or the like.

In an eleventh aspect, in any one of the first to tenth aspects,
The lower end of the waterproof sheet is fixed to the side of the sheet storage groove opposite the site or building.

With the above configuration, the waterproof sheet is easy to pull up, and even after it is pulled up, it extends diagonally toward the top of the pole, making the waterproof sheet stable and easy to store. In addition, because the waterproof sheet is fixed to the outside of the pole when viewed from the site or building, rainwater that falls within the area enclosed by the waterproof sheet can escape into the sheet storage groove. Therefore, by making it possible to drain the water in the sheet storage groove, water is less likely to accumulate on the side of the protected area enclosed by the waterproof sheet.

In the twelfth flood prevention method,
A method for forming a waterproof wall by continuously covering a site or building to be protected with a waterproof sheet, comprising:
(i) At least in the portion including the road or passageway leading to the site or building and through which vehicles and people pass,
A sheet storage groove including a waterproof sheet fixing portion for fixing the lower end of the waterproof sheet;
A plurality of posts having lifting parts that can be raised and lowered by a drive part are provided at positions spaced apart from the waterproof sheet fixing parts,
The lower end of the waterproof sheet is fixed to the waterproof sheet fixing portion, and the upper end of the waterproof sheet is connected to the lifting portion. The waterproof sheet is folded or rolled up in the sheet storage groove portion and stored continuously.
The sheet storage groove portion storing the waterproof sheet is covered with an openable and closable lid portion;
(ii) Even in the portion not including a road or passageway,
A waterproof sheet fixing portion for fixing the lower end of the waterproof sheet is provided continuously,
The waterproof sheet is arranged continuously so that the lower end is fixed to the waterproof sheet fixing part,
A plurality of posts are arranged at positions spaced apart from the waterproof sheet fixing portion,
When in use, the lid is opened and the waterproof sheet is pulled up and supported on the top of the posts, thereby forming a waterproof wall that continuously covers the site or building with the waterproof sheet.

According to the above configuration, in a section including a road or passageway on which vehicles and people pass, the waterproof sheet stored in the sheet storage groove section is covered with the lid section and does not interfere with the passage of vehicles and people during normal times. In the event of flooding, the waterproof sheet is first pulled up in an area that is not a passageway or road and its upper part is fixed to the support, allowing people to enter or exit the site or building using the road or passageway until just before flooding. Finally, in the road or passageway section, the lifting section is raised to remove the lid section and the waterproof sheet is fixed to the upper part of the support, completing a waterproof wall that continuously covers the site or building without transporting the waterproof sheet from a storage location. Furthermore, since the support sections are spaced apart from the sheet fixing section throughout the waterproof wall, the waterproof sheet is easy to pull up, and even after pulling it up, it extends diagonally toward the upper part of the support, making the waterproof sheet stable and easy to store.

A thirteenth aspect of the present invention relates to the twelfth aspect of the present invention,
The lid portion is connected to the lifting portion,
When the lifting section is raised, the lid section is also raised.

According to the above configuration, when the lifting section is raised during use, the lid section also rises and opens at the same time, eliminating the need to open the lid section manually and making it extremely easy to install the waterproof wall.

A fourteenth aspect of the present invention is the twelfth or thirteenth aspect of the present invention,
The lid portion is connected to the upper end of the waterproof sheet to serve as a reinforcing member for the waterproof sheet;
The cover portion is lifted by the lifting portion, so that a continuous waterproof wall is formed by the waterproof sheet.

According to the above configuration, when the drive unit is driven to raise the lifting unit, the waterproof sheet also rises and is lifted at the same time, and since the lid portion also serves as a reinforcing member, the upper end of the waterproof sheet is less likely to bend and has increased strength compared to when there is no reinforcing member, and the height of the waterproof wall can also be increased.

A fifteenth aspect of the present invention relates to the twelfth aspect of the present invention,
The lid portion is lifted by the waterproof sheet which is pulled up by the lifting portion.

According to the above configuration, when the lifting section is raised, the waterproof sheet is automatically lifted, making it extremely easy to install the waterproof wall.

In a sixteenth aspect, in any one of the twelfth to fifteenth aspects,
A beam member is integrally provided on the waterproof sheet, and the beam member constitutes a reinforcing member of the waterproof sheet;
The beam member is supported so as to span the upper parts of a number of supports, so that a continuous waterproof wall is formed by the waterproof sheet.

According to the above configuration, the waterproof sheet is supported via the beam members that are integral with the waterproof sheet, so compared to when there are no beam members, the upper end of the waterproof sheet is less likely to bend, increasing its strength and allowing the waterproof wall to be made taller. In addition, because the beam members are supported by multiple supports, the load applied to the waterproof sheet can be dispersed.

In a seventeenth aspect, in any one of the twelfth to sixteenth aspects,
A pipe member or a bag-sealing portion is provided on the upper portion of the waterproof sheet,
Passing a wire through the pipe member or the sealed portion;
The waterproof sheet is suspended from the support pole via the wire.

With the above configuration, by pulling the wire, the pipe member or sealed portion through which the wire passes is pulled up, and one side of the waterproof sheet is pulled up. This makes it easy and reliable to install a waterproof wall, even with a heavy waterproof sheet. In addition, because the wire passes through the rigid pipe member or sealed portion, the upper end of the waterproof sheet is less likely to bend when the wire is wound up with a winch or the like.

As described above, according to the present invention, under normal circumstances, the waterproof sheet can be used to enter and exit the premises or building without getting in the way, and in the event of flooding, the parts of the premises or building that need to be protected can be quickly covered with the waterproof sheet to easily prevent flooding without having to carry the sheet from another location.

FIG. 2 is a perspective view showing a stored state of the flood prevention system according to the first embodiment of the present invention. FIG. 1B is an enlarged perspective view corresponding to a portion IB of FIG. 1A. 1C is a cross-sectional view taken along line IC-IC in FIG. 1B. 1C is an enlarged perspective view taken along a cross section corresponding to line IC-IC in FIG. 1B. FIG. 1D is a partially enlarged cross-sectional view of FIG. 1 is a perspective view showing a state in which a flood prevention system according to a first embodiment of the present invention is used. FIG. 1C is an enlarged perspective view corresponding to the portion IG of FIG. 1F. 2 is an enlarged cross-sectional view showing the support pillar, the cover, and the surrounding area of the flood prevention system according to the first embodiment of the present invention in a used state. FIG. FIG. 11 is a perspective view showing a stored state of a flood prevention system according to a modified example of the first embodiment of the present invention. FIG. 2B is an enlarged perspective view corresponding to a portion IIB of FIG. 2A. FIG. 2C is a cross-sectional view taken along line IIC-IIC in FIG. 2B. FIG. 2 is a perspective view showing a state in which a flood prevention system according to a modified example of the first embodiment of the present invention is in use. FIG. 2E is an enlarged perspective view corresponding to a portion IIE in FIG. 2D. FIG. 11 is a perspective view showing a stored state of a flood prevention system according to a second embodiment of the present invention. FIG. 3B is an enlarged perspective view corresponding to a portion IIIB of FIG. 3A. FIG. 3C is a cross-sectional view taken along line IIIC-IIIC of FIG. 3B. FIG. 3C is an enlarged perspective view taken along a cross section corresponding to line IIIC-IIIC in FIG. 3B. FIG. 3D is an enlarged cross-sectional view of the lower part of FIG. 3C. FIG. 11 is a perspective view showing a state in which a flood prevention system according to a second embodiment of the present invention is in use. FIG. 4B is an enlarged perspective view corresponding to the portion IVB in FIG. 4A. FIG. 4C is a cross-sectional view taken along line IVC-IVC in FIG. 4B. FIG. 4B is an enlarged perspective view corresponding to the IVD portion of FIG. 4A. FIG. 4B is an enlarged perspective view of the IVE portion of FIG. 4A. This is a cross-sectional view of the IVF-IVF line in Figure 4E. FIG. 4B is an enlarged perspective view of the IVG portion of FIG. 4A. FIG. 11 is a perspective view showing a stored state of a flood prevention system according to a modified example of the second embodiment of the present invention. FIG. 5B is an enlarged perspective view corresponding to the VB portion of FIG. 5A. This is a cross-sectional view taken along the line VC-VC in Figure 5B. FIG. 11 is a perspective view showing a stored state of a flood prevention system provided with a support pillar having a lifting portion around its entire periphery according to a third embodiment of the present invention. FIG. 11 is a perspective view showing a state in which a flood prevention system provided with a support pillar having a lifting portion around its entire periphery according to a third embodiment of the present invention is in use. FIG. 13 is a perspective view showing a stored state of a flood prevention system provided with a support pillar having a lifting section connected to a lid section all around its periphery, according to a modified example of the third embodiment of the present invention. FIG. 13 is a perspective view showing a state in which a flood prevention system according to a modified example of the third embodiment of the present invention is used, the flood prevention system including a support pillar having a lifting section connected to a lid section around its entire periphery. FIG. 11 is an enlarged perspective view showing the support posts and waterproof sheet of the straight sections in the used state according to the fourth embodiment of the present invention. FIG. 11 is an enlarged perspective view showing the corner supports and waterproof sheet in the used state according to the fourth embodiment of the present invention.

Below, an embodiment of the present invention is described based on the drawings.

(Embodiment 1)
- Flood prevention system configuration -
1A and 1F, the flood control system 1 of the first embodiment is installed on a levee E as a site installed along a river. Usually, a bridge B is installed on the levee E at a portion where the levee E crosses a road R on which vehicles and people pass. A fence F of a certain height is installed on the other levee E and bridge B to prevent people and the like from entering the river side. Here, the term "levee" generally refers to a structure made of earth and stone or concrete installed along a river bank, lake bank, or coast to prevent flooding of a river or lake or intrusion of seawater, but also includes the wall of a bank that does not have an embankment, such as a small river flowing through an urban area.

In order to protect the opposite side of the river, which is the protected area, from flooding, of the levee E built along the river, sheet storage grooves 2 are continuously installed along the levee E. The sheet storage grooves 2 need only be installed in the portion including at least the road R leading to the bridge B, and this does not mean that the sheet storage grooves 2 must be installed along the entire length of the river. Since the sheet storage grooves 2 are basically installed along the river, in areas where the river bends, they may be installed so that they bend in the same way as the river, or so that they bend more gently than the river.

As shown in Figures 1C and 1H, the sheet storage groove 2 in this embodiment has a flat rectangular bottom. Although not shown, the bottom may be inclined or a drainage hole may be formed so that water accumulated in the sheet storage groove 2 can be smoothly drained.

The sheet storage groove 2 of this embodiment can be installed not only when a new embankment E is installed, but also as an addition to an existing embankment E. From the standpoint of appearance, safety, etc., the upper part of the sheet storage groove 2 is covered with an openable and closable lid 10.

The sheet storage groove 2 includes a waterproof sheet fixing section, and the lower end 3a of the waterproof sheet 3 that continuously covers the embankment E is fixed to its inner wall. In this embodiment in particular, the lower end 3a of the waterproof sheet 3 is fixed by a mounting bracket 3b on the side of the embankment E that is the object of protection of the sheet storage groove 2, opposite the river.

In addition, in areas where vehicles and people do not pass through, instead of providing a groove 2 for storing the sheet, the upper surface of the embankment E can be used as the waterproof sheet fixing part, and the lower end 3a of the waterproof sheet 3 can be fixed with a mounting bracket 3b, and the waterproof sheet 3 can be folded flat and placed in the vicinity of it, or the waterproof sheet 3 can be stored in a box.

The waterproof sheet 3 is made of a sheet-like member, and there are no particular restrictions on its material or thickness, as long as it is waterproof and flexible; however, taking into consideration that it will be used outdoors for a long period of time, it is made of a material such as a rubber sheet, PVC sheet, or tarpaulin that is highly weather-resistant, i.e., water-resistant, heat-resistant, ozone-resistant, etc. To increase waterproofness and strength against impact, a so-called rubberized cloth is more preferable than a single sheet material.

A number of posts 4 that support the waterproof sheet 3 are provided near the sheet storage groove 2 (specifically, on the opposite side of the embankment E from the river). In this embodiment, most of the posts 4 are posts with linear motion devices and lifting sections 4c so that the waterproof wall 20 can be formed quickly in the event of a disaster. However, although not shown, some of the posts 4 may be fixed posts that do not have lifting sections and are always standing, or they may be movable posts that can be inserted and removed like bollards.

In this embodiment, as shown in Figures 1B to 1E, the support pillar 4 with a linear motion device includes a ball shaft 4a and a support pillar body 4b that is arranged concentrically with the ball shaft 4a and covers the ball shaft 4a. A lifting unit 4c that raises and lowers the waterproof sheet 3 is connected to the ball shaft 4a, and this lifting unit 4c is configured to be able to move up and down within a slit 4d formed in the support pillar body 4b by driving an electric motor 4e as a drive unit. The drive unit may be configured as an actuator driven by other fluids such as a hydraulic motor, hydraulic cylinder, or pneumatic cylinder, or by electricity, etc.

The waterproof sheet 3 can be fixed at its bottom end 3a to the sheet storage groove 2, and can be pulled up to the lifting section 4c and fixed at its top to the tops of the multiple posts 4. There is no particular limit to the way in which the waterproof sheet 3 is folded, but it can be folded in a zigzag pattern and stacked one above the other, for example. In some cases, it may be rolled up and stored. As mentioned above, the bottom end 3a of the waterproof sheet 3 is fixed to the river-side inner wall of the sheet storage groove 2 by the mounting bracket 3b, but the fixing method is not particularly limited.

The sheet storage groove 2 in which the waterproof sheet 3 is folded and stored is covered with a plate-shaped lid 10. The lid 10 may simply be fitted into the lid recess 2a (shown in FIG. 1D) on the periphery of the sheet storage groove 2, or may be configured to be openable and closable by providing a hinge (not shown). The illustrated lid 10 is a plate-like structure without holes, but in some cases it may be configured with holes like gratings. In the case of a plate-like structure without holes, it is preferable that the surface is formed with uneven surfaces to prevent slipping. The lid 10 has a support opening 10a to avoid the cylindrical support 4.

In this embodiment, as shown in Figure 1G, a rod-shaped beam member 6 is provided in the sealed portion 3c of the waterproof sheet 3. For example, a beam member 6 made of a steel bar, a metal pipe, or the like is inserted into the sealed portion 3c formed at the upper end of the waterproof sheet 3. As shown in Figures 1D and 1G, the beam member 6 is connected to the lifting section 3c. In the storage position, the beam member 6 is stored in the sheet storage groove section 2 together with the waterproof sheet 3. The beam member 6 also moves up and down in conjunction with the lifting and lowering operation of the lifting and lowering section 3c, and as a result, the upper end of the waterproof sheet 3 moves up and down.

When the lifting section 3c of the flood defense system 1 rises from the stored position to the usage position, the waterproof sheet 3 is pulled up as shown in Figures 1G, 1H, etc., and the beam members 6 are supported so as to span the tops of the multiple supports 4, so that the waterproof sheet 3 forms a waterproof wall 20 continuously along the river as shown in Figure 1F.

-Method of forming a waterproof wall-
First, a sheet storage groove 2 is provided along the embankment E, including the area where the road R and bridge B are located, and is covered with an openable and closable lid 10. A support 4 having a lifting section 4c is erected at a position separated from the mounting bracket 3b of the sheet storage groove 2, specifically on the opposite side to the river. Although not shown in detail, electric wires for power supply and drive control for the electric motor 4e of the support 4 are connected and laid inside the sheet storage groove 2.

As a result, as shown in Figures 1A to 1E, when the waterproof sheet 3 is stored, the waterproof sheet 3 is stored in the sheet storage groove 2 and the lower ends of the posts 4 are stored, allowing vehicles and people to pass over the lid 10 that covers the sheet storage groove 2. In this embodiment, even in areas where there is no bridge B, the sheet storage groove 2 is covered by the lid 10, so people, bicycles, etc. are not hindered when passing along the river.

In the event of flooding, first, in areas other than road R, the lifting unit 4c is raised from the stored position shown in Figures 1B, 1C, etc., and the waterproof sheet 3 is pulled up from the sheet storage groove 2 while the lid 10 is opened, and the lifting unit 4c reaches the usage position shown in Figures 1G, 1H, etc., thereby fixing the upper end of the waterproof sheet 3 to the multiple pillars 4. Finally, in the bridge B area, the lifting unit 4c is raised from the stored position, the lid 10 is opened, and the waterproof sheet 3 is pulled up from the sheet storage groove 2, and the lifting unit 4c reaches the usage position, thereby fixing the upper end of the waterproof sheet 3 to the multiple pillars 4. In this way, road R leading to bridge B can be passed through until just before flooding.

This allows the beam member 6 to be supported across multiple supports 4, and a continuous waterproof wall 20 is formed by the waterproof sheet 3, as shown in Figure 1F.

On the other hand, when the possibility of flooding has subsided and it is time to store the waterproof sheet 3 again, the lifting section 4c is returned from the use position to the storage position, the waterproof sheet 3 is lowered from the multiple supports 4, folded and stored in the sheet storage groove section 2, and the lid section 10 is closed. Since the support opening 10a is formed in the lid section 10, the lid section 10 does not come into contact with the support 4.

In this embodiment, as shown in Figure 1G, the waterproof sheet 3 is supported via beam members 6 that are integral with the waterproof sheet 3, so that the upper end of the waterproof sheet 3 is less likely to bend and has increased strength compared to when there are no beam members 6, and the height of the waterproof wall 20 can also be increased. In addition, because the beam members 6 are supported by multiple supports 4, the load applied to the waterproof sheet 3 can be distributed.

In this embodiment, the support pole 4 is separated from the sheet fixing portion (the mounting bracket 3b portion), so the waterproof sheet 3 can be easily pulled up, and as shown in Figure 1H, even after being pulled up, it extends diagonally toward the top of the support pole 4, making the waterproof sheet 3 stable and easy to store. Furthermore, the water pressure is also supported as a tensile load by the mounting bracket 3b portion, so the load on the support pole 4 is also reduced.

As described above, according to this embodiment, under normal circumstances, the waterproof sheet 3 can be used to pass over bridge B without getting in the way, and in the event of flooding, the waterproof sheet 3 can quickly and easily prevent flooding from the river.

--Modifications--
2A to 2E show a flood prevention system 1' according to a modification of the first embodiment of the present invention, which differs from the first embodiment in particular in the configuration of the cover 10'. Note that in the following modifications and embodiments, the same parts as those in Figs. 1A to 1H are denoted by the same reference numerals and detailed description thereof will be omitted.

In this modified example, the lid 10' is configured to move up and down together with the lifting unit 4c. Since the lid 10' moves up and down together with the lifting unit 4c, the pillar opening 10a' is circular, as shown in FIG. 2B. A beam member 6 may be inserted into the upper end of the waterproof sheet 3, as in the first embodiment.

Even in this modified example, in the stored state shown in Figures 2A to 2C, the waterproof sheet 3 is stored in the sheet storage groove 2 and is covered by the lid 10', so that it does not impede the passage of vehicles or people.

When the lifting section 4c is raised, the lid section 10' also rises, and the upper end of the waterproof sheet 3 is also pulled up.

When the lifting section 4c rises to the use position as shown in Fig. 2E, the waterproof wall 20' is formed by the waterproof sheet 3 as shown in Fig. 2D. At this time, the cover section 10' is on the upper side of the support 4, so it is not leaning against the waterproof sheet 3 and does not apply a load to the support 4.

When the lifting section 4c is lowered to store the waterproof sheet 3, the waterproof sheet 3 is also folded. The folding method may be devised so that the waterproof sheet 3 is folded automatically.

In this way, even in this modified example, a waterproof wall 20' can be quickly and easily formed to prevent water from entering from the river.

(Embodiment 2)
3A to 4G show a flood prevention system 101 according to a second embodiment of the present invention, which differs from the first embodiment in that the object to be protected from flooding is different.

- Flood prevention system configuration -
The flood prevention system 101 of the second embodiment of the present invention is provided with a sheet storage groove portion 102 including a waterproof sheet fixing portion that is continuously dug in a polygonal shape (rectangular shape in this embodiment) in a plan view.

In this embodiment, the object to be protected is a single residential building P, but the scope of application is wide, such as surrounding an entire block including multiple homes or factories, surrounding a park as an evacuation site, or surrounding farmland to prevent the occurrence of crop diseases due to flooding or inundation. If other waterproof structures such as block walls are installed, it is sufficient to surround only the parts where those structures are not installed.

For example, as shown in Figure 4A, the sheet storage groove 102 is provided in a rectangular shape to surround the building P, but may be provided in another polygonal shape to match the shape of the site A of the building P. As shown in Figures 3C and 3E, a waterproof sheet 103 is stored in the sheet storage groove 102 so as to be folded, which when pulled up forms a waterproof wall 120 (shown in Figure 4A) that has a continuous polygonal shape in a plan view. Although not shown in detail, when folding the waterproof sheet 103, it is folded so that the waterproof sheet 103 can be pulled out appropriately, particularly at the corners. The folding is performed appropriately depending on the angle of the corners, the thickness of the waterproof sheet 103, etc.

As shown in Fig. 3E etc., in this embodiment, the sheet storage groove 102 has a flat bottom and a rectangular cross section. Although not shown, the bottom may be inclined or a drainage hole may be formed so that water accumulated in the sheet storage groove 102 can be smoothly drained. Note that the drainage hole may be provided with an openable cover or a check valve that opens only in the drainage direction to prevent sewage or the like from backing up through the drainage hole in the event of flooding.

In this embodiment, multiple supports 104, 104' are provided not only at the corners of the rectangle but also on each side that forms the rectangle to support the pulled-up waterproof sheet 103. In this embodiment, the multiple supports 104, 104' are provided inside the sheet storage groove 102 (on the site A side of the building P side that is protected from inland flooding, etc.) and are configured so that the waterproof sheet 103 is hung from the top. The number of supports 104, 104' may be more or less than this.

In this embodiment, each support 104 on and around the passage G leading to the entrance D of the building P has a ball shaft 104a and a support body 104b that is concentric with the ball shaft 104a and covers the ball shaft 104a, as in the first embodiment. A lifting unit 104c that raises and lowers the waterproof sheet 103 is connected to the ball shaft 104a, and the lifting unit 104c drives an electric motor 104e as a drive unit, allowing the lifting unit 104c to move up and down within a slit 104d (shown in FIG. 3B) formed in the support body 104b.

As shown in Figure 4B, similar to the first embodiment, a sealed portion 103c is provided at the upper end of the waterproof sheet 103, and a beam member 106 made of, for example, a round bar or a round pipe is inserted into the sealed portion 103c, so that the waterproof sheet 103 is suspended from the beam member 106. The beam member 106 is firmly fixed to the lifting and lowering portion 104c, so that the upper end of the waterproof sheet 103 also lifts and lowers as the lifting and lowering portion 104c lifts and lowers.

3E, the lower end 103a of the waterproof sheet 103 is fixed by a mounting bracket 103b to the inner wall opposite the site A or building P that is the object of protection of the sheet storage groove 102. The waterproof sheet 103 is stored in a manner that wraps around the sheet storage groove 102.

In this embodiment, as shown in Fig. 3A, the pillars other than the pillars 104 around the entrances and exits of the building P do not have lifting sections 104c and are fixed pillars 104' that are not stored in the ground. Although not shown, the fixed pillars 104' may be connected to each other by multiple fixed beams to serve as a fence surrounding the building P. In the event of flooding, the waterproof sheet 103 is pulled up and the upper part is fixed to the fixed pillars 104'.

As shown in Figures 4D and 4E, the waterproof sheet 103 of the fixed support 104' also has a sealed portion 103c at the upper end thereof, and a beam member 106 is inserted into the sealed portion 103c, so that the waterproof sheet 103 is suspended from the beam member 106. The waterproof sheet 103 can be pulled up manually, for example.

As shown in Figure 4D, an engagement recess 107 is formed at the upper end of the fixed support 104' in the straight section, and as shown in Figure 4G, an engagement recess 107' with a recess shape that matches the angle of the corner is provided at the upper end of the fixed support 104' in the corner section. Meanwhile, the beam member 106 at the upper end of the waterproof sheet 103 is engaged with these engagement recesses 107, 107', so that the waterproof sheet 103 is suspended from the beam member 106.

When in use (when flooded), as shown in Figures 4B, 4C and 4F, the waterproof sheet 103 is pulled up so as to slope upward toward the upper part of the supports 104, 104'.

As shown in Figure 4A, the waterproof sheet 3 is pulled up and bent at the support 4 at the corner of the site A or building P and fixed to the top of the support posts 104, 104', so that a continuous waterproof wall 120 is formed by the waterproof sheet 103.

-Flood prevention methods-
Next, a flood prevention method according to this embodiment will be described.

As shown in Figure 3A, when the flood prevention system 101 is not in use, such as during normal times (ordinary times), the waterproof sheet 103 is stored in the sheet storage groove 102 in and around the passage G on the entrance/exit D side, and is covered with a lid 110. In addition, no supports 104 are provided around the entrance/exit D of the building P. This gives a good appearance and does not impede entry or exit to the building P. Meanwhile, the other fixed supports 104' are always installed in an upright position, and act as a fence.

When using the device (when submerged in water), first remove the lid 110 from the fixed support 104'. For example, place the lid 110 near the fixed support 104'.

Next, as shown in Figures 4D and 4E, the beam members 106 of the waterproof sheet 103 are fitted from above into the engagement recesses 7 of the fixed posts 104' to engage them. For the corners, as shown in Figure 4G, the tips of the beam members 106 are engaged with the engagement recesses 107' of the fixed posts 104' designed specifically for corners. This causes the waterproof sheet 103 to be pulled up so that it is inclined toward the upper side of the fixed posts 104', as shown in Figure 4F.

This work is first carried out within the range of the fixed pillars 104'. This will allow people to enter and exit the building P until the building P is completely covered.

Next, the electric motor 104e of the support 104 around the passageway leading to the entrance/exit D of the building P is driven. For example, if a signal is sent from a mobile communication device such as a smartphone to a control panel (not shown) to drive the electric motor 104e, the lifting/lowering unit 104c can be safely operated from a safe position.

When the lifting section 104c starts to rise, the lid section 110 is pushed up by the pulled-up waterproof sheet 103, as shown in an enlarged view in FIG. 4B. When the lifting section 104c is raised to the use position, the waterproof sheet 103 is fixed to the upper part of the support 104.

As a result, without having to carry the posts 104, 104' and waterproof sheet 103 from another storage location, a waterproof wall 120 with a continuous rectangular cross-section and inclined side walls is completed quickly around the site A or building P, as shown in Figure 4A, with corners bent at the corner fixed posts 104' in a plan view. Note that a pattern or the like may be drawn on the outer peripheral surface of the waterproof wall 120 to prevent the appearance from being deteriorated.

In this way, in this embodiment, the waterproof sheet 103 stored in the sheet storage groove 102 is simply pulled up and supported by the posts 104, 104' to complete a waterproof wall 120 that is polygonal in plan view and continuously covers the periphery of the site A or building P.

In addition, the waterproof sheet 103 is supported via a beam member 106 spanning the upper parts of multiple supports 104, 104', thereby increasing its strength and allowing the height of the waterproof wall 120 to be increased.

Furthermore, it is desirable to leave the support columns 104 on and around the passage G wide enough for vehicles to pass through. This not only looks good, but also does not impede the entry and exit of vehicles to and from the site A and building P.

In this embodiment, the lower end 103a of the waterproof sheet 103 is fixed to the side opposite the site A or building P that is the object of protection of the sheet storage groove 102, so that the waterproof sheet 103 is easy to pull up, and even after being pulled up, it extends diagonally toward the upper part of the support poles 104 and the fixed support poles 104', so that the waterproof sheet 103 is stable and easy to store. In addition, rainwater that falls within the area enclosed by the waterproof sheet 103 can be drained into the sheet storage groove 102.

Therefore, in the flood prevention system 101 of this embodiment, under normal circumstances, the waterproof sheet 103 can be used to enter and exit the site A or building P without getting in the way, and in the event of flooding, the waterproof sheet 103 can be used to quickly and safely cover the parts of the site A or building P that need to be protected, preventing flooding, without the need to transport supports 104, 104' or waterproof sheet 103 from another location.

In addition, in this embodiment, minor flooding that does not qualify as "flooding above floor level or flooding exceeding 45 cm below ground level," which is not subject to the payment of fire insurance premiums, can be effectively prevented by the waterproof wall 120 of the waterproof sheet 103 alone.

In the above embodiment 2, the waterproof wall 120 is provided in a rectangular shape in plan view, but it may also include curved shapes such as a circle, an ellipse, or an oval in plan view. In addition, if there is a retaining wall in a part, the waterproof wall 120 may be provided only in the other necessary areas, not around the entire circumference. In such a case, the sheet storage groove 102 and the support posts 104, 104' may be arranged according to the shape. Furthermore, if a part is recessed in plan view, the support posts 104, 104' may be arranged on the corner part on the opposite side to the site or building to be protected (outside the waterproof sheet 103). In that case, the lower end 103a of the waterproof sheet 103 may be fixed to the opposite side of the sheet storage groove 102 to the site A or building P to be protected.

--Modifications--
5A to 5C show a flood prevention system 101' according to a modification of the second embodiment of the present invention, which differs from the second embodiment in particular in the configuration of the cover 110'. Note that in the following modifications and embodiments, the same parts as those in Figs. 3A to 4G are denoted by the same reference numerals and detailed description thereof will be omitted.

In this modified example, the lid 110' is configured to move up and down together with the lifting unit 104c. Since the lid 110' moves up and down together with the lifting unit 104c, the pillar opening 110a' is circular. As in the second embodiment, the beam member 6 may be inserted into the upper end of the waterproof sheet 103.

Even in this modified example, in the stored state (not shown), the waterproof sheet 103 is stored in the sheet storage groove 102 and is covered by the lid 110' so that it does not impede the passage of vehicles or people.

When the lifting section 104c is raised, the lid section 110' also rises, and the upper end of the waterproof sheet 103 is also pulled up.

When the lifting section 104c rises to the use position as shown in Figures 5B and 5C, a waterproof wall 120' is formed by the waterproof sheet 103 as shown in Figure 5A. At this time, the cover section 110' is on the upper side of the support 104, so it is not leaning against the waterproof sheet 103 and does not apply a load to the support 104.

When the lifting section 104c is lowered to store the waterproof sheet 103, the waterproof sheet 103 is also folded. It is advisable to devise a folding method so that the waterproof sheet 103 is folded automatically.

In this way, even in this modified example, a waterproof wall 120' can be quickly and easily formed to prevent water from entering from the river.

(Embodiment 3)
6A and 6B show a flood prevention system 201 according to a third embodiment of the present invention, which differs from the second embodiment in that it does not have a fixed support 104'.

- Flood prevention system configuration -
As shown in FIG. 6B, a flood prevention system 201 according to the third embodiment of the present invention, like the second embodiment, is also provided with a sheet storage groove 102 having a waterproof sheet fixing portion that is continuously dug in a rectangular shape in a plan view.

In this embodiment, pillars 104 having lifting sections 104c are provided not only on the passage G leading to the entrance D of the building P, but also all around. Although a detailed explanation is omitted, the lid sections 210' corresponding to the pillars 104 at the corners may be shaped differently from the other lid sections 110, and the pair of lid sections 210' at the corners may be opened as the lifting section 104c rises.

In this embodiment, under normal circumstances, as shown in FIG. 6A, all the posts 104 and waterproof sheets 103 are stored and covered with the lids 110, 210', so that the appearance is good and passage is possible not only along the passage G but all around.

In the event of flooding, first, the lifting sections 104c of all of the pillars 104 other than the passage G section are raised, and while opening the lid sections 110, 210', the lifting sections 104c are raised from the stored position to the usage position, and the beam members 106 of the waterproof sheet 103 are moved to the top of the pillars 104, thereby pulling up the waterproof sheet 103.

Finally, by raising the lifting portion 104c of the support 104 in the passage G portion, the lid portion 110 is opened while the beam member 106 of the waterproof sheet 103 is moved to the top of the support 104, and the waterproof sheet 103 is pulled up.

As a result, a continuous waterproof wall 220 is formed by the waterproof sheet 103, as in embodiment 2 above, as shown in Figure 6B.

Therefore, in this embodiment as well, under normal circumstances, the waterproof sheet 103 and supports 104 do not get in the way and one can enter and exit the site A or building P through the passage G, and in the event of flooding, the waterproof sheet 103 can be used to quickly cover the parts of the site A or building P that need to be protected and easily prevent flooding without the need to carry the supports 104 or waterproof sheet 103 from another location.

--Modifications--
7A and 7B show a water defense system 201' according to a modified example of the third embodiment of the present invention, which differs from the third embodiment in particular in the configuration of the cover portion 110'.

In this modified example, the lid 110' is configured to move up and down integrally with the lifting section 104c. The lid 110' moves up and down together with the lifting section 104c, so the pillar opening 110a' is circular. As in the second embodiment, a beam member 6 may be inserted into the upper end of the waterproof sheet 103. In this modified example, the lid 210'' at the corner is L-shaped and is moved up and down by a single lifting section 104c.

Even in this modified example, in the stored state (not shown), the waterproof sheet 103 is stored in the sheet storage groove 102 and is covered by the lid 110' so that it does not impede the passage of vehicles or people.

When the lifting section 104c is raised, the lid sections 110', 210'' also rise, and the upper end of the waterproof sheet 103 is also pulled up.

When the lifting section 104c rises to the use position, as shown in FIG. 7B, the waterproof sheet 103 forms a waterproof wall 220'. At this time, the lids 110' and 210'' are located above the support 104, so they are not leaning against the waterproof sheet 103 and do not apply a load to the support 104.

When the lifting section 104c is lowered to store the waterproof sheet 103, the waterproof sheet 103 is also folded. The folding method may be devised so that the waterproof sheet 103 is folded automatically.

In this way, even in this modified example, a waterproof wall 220' can be quickly and easily formed to prevent water from entering the building P or the site A.

(Embodiment 4)
8A and 8B show a flood prevention system 301 according to a fourth embodiment of the present invention, which differs from the above-described embodiments in that a wire 306 is inserted through a sealed portion 303 c at the upper end of the waterproof sheet 303 .

The wire 306 passes continuously through the sealed portion 303c (which may be a pipe member inserted into the sealed portion) of the waterproof sheet 303, spanning multiple supports 304.

Although not shown, pulleys may be provided on the upper portions of at least some of the multiple pillars 304. The wire 306 may be connected to an electric or hydraulically driven winch via the pulleys.

The wire 306, including its straight and corner portions, is engaged by fitting it into the engagement recesses 307, 307' at the upper end of each support 304, making it difficult for the wire 306 to come loose, but the wire 306 itself may be movable in its axial direction.

In the event of flooding, the support poles 304 may be pulled up, and then the wire 306 attached to the pulley may be wound up by an electrically or hydraulically driven winch, so that the waterproof sheet 303 is pulled up to the upper side of the support poles 304. The height of the waterproof sheet 303 may be adjusted to a height at which water caused by inland flooding can be stopped by changing the amount of winding by the winch.

In this way, the waterproof wall can be easily and reliably installed even with a heavy waterproof sheet 303. In addition, because the wire 306 is passed through the rigid pipe member or sealed portion 303c, the upper end of the waterproof sheet 303 is less likely to bend when the wire 306 is wound up with a winch or the like.

Note that the above embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications or uses.

Other Embodiments
The present invention may be configured as follows with respect to the above embodiment.

In the above embodiment, the support pillar 4, 104 with the linear motion device is disposed inside the sheet storage groove 2, 102. Although not shown in detail, the support pillar 4, 104 with the linear motion device may be disposed outside the sheet storage groove 2, 102 on the opposite side to the object to be protected.

In that case, if a storage space for the lifting unit 4c, 104c is provided, the installation space for the support 4, 104 can be reduced, and the cover 10, 110 can be made smaller, which is advantageous. It is also advisable to secure a space for passing the electric wires connected to the electric motor 4e, 104e from the seat storage groove 2, 102 to the support 4, 104.

In each of the above embodiments, the waterproof sheet 3, 103, 303 is folded and stored in the sheet storage groove 2, 102, but it may also be partially rolled up and stored. In addition, if the sheet storage groove 2, 102 is not dug, the folded or rolled waterproof sheet 3, 103, 303 may be placed directly on the ground or in a box (not shown) placed on the ground.

1, 1', 101, 101', 201, 201', 301 Flood control system
2,102 Seat storage groove
2a Lid recess
3,103,303 Waterproof sheet
3a, 103a Lower end
3b, 103b Mounting bracket (waterproof sheet fixing part)
3c, 103c, 303c Enclosed section
4,104,204,304 Pillar
4a Ball shaft
4b Pillar body
4c, 104c Lifting section
4d Slit
4e, 104e Electric motor (drive unit)
6, 106, 306 Beam member
7, 107, 107', 307, 307' Engagement recess
10, 10', 110, 110', 210' Lid
20, 20', 120, 120', 220, 220' Waterproof wall 104' Fixed support 306 Wire
A. Site
B Bridge section
D Entrance/Exit
E. Embankment
F fence
Aisle G
P Building
R Road

Claims (19)

a waterproof sheet fixing portion that is continuously installed along the site or building to be protected;
A waterproof sheet having a lower end fixed to the waterproof sheet fixing portion and continuously covering the site or building;
A plurality of posts are provided in the vicinity of the waterproof sheet fixing portion and support the waterproof sheet,
The waterproof sheet has a lower end that can be fixed to the waterproof sheet fixing portion, and an upper end that can be pulled up and fixed to the upper portions of the plurality of supports,
A flood prevention system in which a waterproof wall is continuously formed by the waterproof sheet when the waterproof sheet is pulled up and fixed to the upper part of the plurality of supports,
At least on roads or passageways leading to the site or building and through which vehicles and people pass,
A sheet storage groove portion that is continuously dug and includes the waterproof sheet fixing portion;
A cover that can be opened and closed to cover the sheet storage groove;
A lifting section provided on the support and having an upper end of the waterproof sheet fixed thereto and capable of moving up and down;
a drive unit that is separate from the lid unit , is provided on the support column above a position where the lift unit is disposed , and drives the lift unit to move up and down;
In a normal state, the waterproof sheet is stored in the seat storage groove, and the lifting section is in a storage position, allowing vehicles and people to pass over the lid section that covers the seat storage groove,
This flood prevention system is configured so that, in the event of flooding, the drive unit raises the lifting unit from the storage position, the lid opens to pull the waterproof sheet out of the sheet storage groove, and the lifting unit moves to a usage position so that the upper part of the waterproof sheet is fixed to the multiple supports. 2. The flood prevention system according to claim 1, wherein the support pillar is erected on the site or building side of the waterproof sheet fixing portion and outside the passage area of the road or passage. The site is a levee along a river, a lake, or a coast, and the waterproof sheet fixing portion is provided along the levee,
3. The flood control system according to claim 1 or 2, wherein the road leads to a bridge. The waterproof sheet fixing portion is provided around the site or building,
The passage leads to an entrance or exit of the site or building,
A flood prevention system as described in claim 1 or 2, characterized in that in the event of flooding, the waterproof sheet is pulled up and folded at the portion of the support pillar at the corner of the site or building, and fixed to the top of the support pillar in a folded state, so that a continuous waterproof wall is formed by the waterproof sheet. In the portion where there is no road or passage, the support is a fixed support that does not have the lifting part,
3. The flood prevention system according to claim 1 or 2, characterized in that, in the event of flooding, the waterproof sheet is pulled up and an upper portion is fixed to the fixed pillar. 3. The flood prevention system according to claim 1, wherein the cover is fixed to the lifting section and configured to move up and down together with the lifting section. The cover portion is connected to the upper end of the waterproof sheet, thereby serving as a reinforcing member for the waterproof sheet,
3. The flood prevention system according to claim 1, wherein the cover is lifted by the lifting section, so that a continuous waterproof wall is formed by the waterproof sheet. 3. The flood prevention system according to claim 1, wherein the cover is configured to be lifted by the waterproof sheet that is pulled out by the lifting section. A beam member is integrally provided on the waterproof sheet, and the beam member constitutes a reinforcing member of the waterproof sheet,
3. The flood prevention system according to claim 1 or 2, wherein the beam members are supported across a plurality of supports, so that a continuous waterproof wall is formed by the waterproof sheet. A pipe member or a bag-sealing portion is provided on the upper portion of the waterproof sheet,
A wire is passed through the pipe member or the sealed portion,
3. The flood prevention system according to claim 1, wherein the waterproof sheet is suspended from the support pole via the wire. 3. The flood prevention system according to claim 1 or 2, wherein a lower end of the waterproof sheet is fixed to the side of the sheet storage groove opposite the site or building. A method for forming a waterproof wall by continuously covering a site or building to be protected with a waterproof sheet, comprising:
(i) At least in the portion including the road or passageway leading to the site or building and through which vehicles and people pass,
A sheet storage groove including a waterproof sheet fixing portion for fixing the lower end of the waterproof sheet;
A plurality of posts having lifting parts that can be raised and lowered by a drive part are provided at positions spaced apart from the waterproof sheet fixing parts,
The lower end of the waterproof sheet is fixed to the waterproof sheet fixing portion, and the upper end of the waterproof sheet is connected to the lifting portion. The waterproof sheet is folded or rolled up in the sheet storage groove portion and stored continuously.
The sheet storage groove portion storing the waterproof sheet is covered with an openable and closable lid portion;
(ii) Even in the portion not including a road or passageway,
A waterproof sheet fixing portion for fixing the lower end of the waterproof sheet is provided continuously,
The waterproof sheet is arranged continuously so that the lower end is fixed to the waterproof sheet fixing part,
A plurality of posts are arranged at positions spaced apart from the waterproof sheet fixing portion,
This flood prevention method is characterized in that, when in use, the lifting part is raised by a drive unit that is separate from the lid part and is provided on the support above the position where the lifting part is located , the lid part is opened, and the waterproof sheet is pulled up and supported on the top of the support, thereby forming a waterproof wall using the waterproof sheet to continuously cover the site or building. The lid portion is connected to the lifting portion,
13. The flood prevention method according to claim 12, wherein the lid portion is also raised when the lifting portion is raised. The lid portion is connected to the upper end of the waterproof sheet to serve as a reinforcing member for the waterproof sheet;
The flood prevention method according to claim 13, characterized in that the cover is lifted by the lifting section, thereby forming a continuous waterproof wall by the waterproof sheet. The flood prevention method according to claim 12, characterized in that the cover is lifted by the waterproof sheet which is pulled up by the lifting section. A beam member is integrally provided on the waterproof sheet, and the beam member constitutes a reinforcing member of the waterproof sheet;
13. A flood prevention method according to claim 12, wherein the beam member is supported so as to span the upper parts of a plurality of supports, thereby forming a continuous waterproof wall using the waterproof sheet. A pipe member or a bag-sealing portion is provided on the upper portion of the waterproof sheet,
Passing a wire through the pipe member or the sealed portion;
The flood prevention method according to claim 12, characterized in that the waterproof sheet is suspended from the support pole via the wire. 3. The flood prevention system according to claim 1, wherein the cover portion is formed with an opening for a support pillar so as to avoid the support pillar. The flood prevention system according to claim 18, wherein the cover portion is configured to be movable up and down together with the lifting portion so as to avoid the support column inside the support column opening.