Flood prevention system and flood prevention method

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

[Technical field]

[0001] The present invention relates to a flood prevention system and a flood prevention method. [Background technology]

[0002] 2. Description of the Related Art 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.

[0003] Also, as shown in Patent Document 2, a waterproofing device is known which comprises 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 end of the support member pressing the dam plate against the ground to provide waterproofing, and which is laid in large numbers over the entire land of a house.

[0004] Furthermore, a flood prevention device is known in which a flexible wall (waterproof sheet) is stored in a trench (groove portion) 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 in Patent Document 3.

[0005] Furthermore, as disclosed in Patent Document 4, a waterproofing device that forms a waterproof wall with posts and a waterproof sheet on a river bank includes, for example, a waterproofing device that uses guardrail posts or a fence.

[0006] Furthermore, flood prevention devices equipped with a mechanism for raising and lowering a water stop or 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, as described in Patent Documents 5 and 6. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2008-88791 A [Patent Document 2] Patent No. 2886123 [Patent Document 3] Patent No. 6676707 [Patent Document 4] JP 2017-141601 A [Patent Document 5] JP 2014-227721 A [Patent Document 6] JP 2012-82590 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, the device in Patent Document 1 does not have any supports or waterproof sheets under normal circumstances, so there is no problem 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, seal them with the side walls, etc. For this reason, it can only effectively be used on a small scale to prevent flooding of rivers caused by sudden heavy rain, or flooding under or above the floor caused by inland sewage water overflows, 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 waterproof device itself is dangerous.

[0009] The device of Patent Document 2 requires a large space to store many barrier plates. Furthermore, since the work of installing many barrier plates and tightening them with a pressing means must be carried out over a wide area of ​​the site or building to be enclosed, it takes a lot of time to install the flood prevention device, particularly along rivers or around factories, and dangerous work must be carried out for long periods of time in the event of an emergency when the water level rises.

[0010] 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 flooding is applied to the support poles. Also, the support parts of the support poles, which are subject to a large load, are shallow and the structure cannot withstand a large load, so the support poles must be supported from the opposite side to the water by a receiver, which is a separate member from the support poles, which creates the problem of time-consuming installation.

[0011] In the case of the structure described in Patent Document 4, since there are no guardrails or fences on the bridges over rivers to allow vehicles and pedestrians to pass over them, it is not possible to install flood walls, and therefore the structure cannot be used to prevent flooding on rivers with many bridges, such as small rivers and irrigation canals in urban areas.

[0012] 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 under high water pressure.

[0013] In addition, in the case of the structure described in Patent Document 6, while the posts and waterproof sheet are already designed to be robust and watertight, 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 that the zipper gets caught when the waterproof sheet is raised and cannot be closed.

[0014] The present invention has been made in consideration of the above-mentioned points, and its purpose is to enable roads and passageways used by vehicles and pedestrians to be passable under normal circumstances, but to quickly install waterproof walls including those sections in the event of a sudden rise in water level, thereby preventing flooding of the site or building to be protected. [Means for solving the problem]

[0015] In order to achieve the above object, in this invention, in the section leading to the road or passageway, a waterproof sheet is stored under normal circumstances so that the person 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.

[0016] 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.

[0017] According to the above configuration, under normal circumstances, when vehicles or people pass through the passage leading to the entrance of the site or building, the waterproof sheet stored in the sheet storage groove is covered with the lid, so that it does not obstruct the passage. Then, when flooding occurs, the waterproof sheet is first pulled up in an area that is not a 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. 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, the meaning of "site" includes not only the site of a building such as a house or factory, but also the wall part of a river, a lake, a coastal embankment, and a bank without embankment.

[0018] In the second invention, in the first 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.

[0019] According to the above configuration, the support poles are erected outside the passage area, so they do not impede passage. In addition, since the support poles are installed on the side of the object to be protected rather than the waterproof sheet fixing part, the waterproof sheet is stretched in an inclined state from the top end of the support poles toward the waterproof sheet fixing part. In addition, a 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 poles is reduced.

[0020] 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.

[0021] 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 lift up the waterproof sheet and open the lid, and the lifting unit is set to the usage position and the waterproof sheet is fixed to the top of the support, completing a continuous waterproof wall including the road leading to the bridge, making it possible to waterproof the embankment. Here, the term "embankment" generally refers to a structure made of earth and stone or concrete that is built along a river bank, lake bank, or coast to prevent flooding of rivers and lakes and 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.

[0022] 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.

[0023] 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, when flooding occurs, 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 and 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 to the use position and the waterproof sheet is fixed to the upper part of the support, so that the periphery of the site or building has corners that are bent at the parts of the support that are located at the corners of the site or building in a plan view, completing a continuous waterproof wall. Therefore, the waterproof sheet can be very quickly and easily covered to appropriately cover the parts of the site or building that need protection and prevent flooding by simply pulling it up from the sheet storage groove without having to carry it from a storage place.

[0024] 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 pillar is a fixed support pillar not having the lifting part, When flooded, the waterproof sheet is pulled up and the upper part is fixed to the fixed pole.

[0025] According to the above configuration, if the part that does not obstruct passage is a fixed support without a lifting part, there is no need to provide a lifting part for all the supports, resulting in a simple and inexpensive configuration, and in the event of flooding, the waterproof sheet can be simply pulled up and fixed to the fixed supports, so there is no need to bring in supports and the installation of the waterproof sheet is easy. In addition, the fixed supports can also be used as a fence to cover a site or building.

[0026] 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 lift portion and configured to move up and down together with the lift portion.

[0027] According to the above configuration, when in use, the lid rises and opens together with the lifting part when the drive part is operated, so there is no need to open or remove the lid by hand. When storing, the lid is lowered by the lifting part and closed again when the waterproof sheet is folded, making storage easy.

[0028] In a seventh aspect of the present invention, in any one of the first to sixth aspects of the present invention, 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.

[0029] According to the above configuration, when the drive unit is driven to raise the lifting unit, the waterproof sheet is lifted simultaneously with the lid unit, and 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.

[0030] In an eighth aspect of the present invention, in any one of the first to sixth aspects of the present invention, The lid portion is configured to be lifted by the waterproof sheet that is pulled out by the lifting portion.

[0031] According to the above configuration, when the lifting section is raised, the lid section is automatically lifted along with the waterproof sheet, so there is no need to open the lid section manually, making it extremely easy to install the waterproof wall.

[0032] In a ninth aspect of the present invention, in any one of the first to sixth aspects of the present invention, 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.

[0033] According to the above-mentioned configuration, the waterproof sheet is supported by the beam members that are integral with the waterproof sheet, so that the upper end of the waterproof sheet is less likely to bend and the strength is increased compared to when there are no beam members, and the height of the waterproof wall can be increased. In addition, since the beam members are supported by multiple supports, the load applied to the waterproof sheet can be dispersed.

[0034] In a tenth aspect of the present invention, in any one of the first to sixth aspects of the present invention, A pipe member or a sealed 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.

[0035] According to the above configuration, by pulling the wire, the pipe member or sealed portion through which the wire passes is pulled up, and the waterproof sheet on one side is pulled up. Therefore, even if the waterproof sheet is heavy, the waterproof wall can be easily and reliably installed. In addition, since the wire is passed 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.

[0036] In an eleventh aspect of the present invention, in any one of the first to tenth aspects of the present invention, The lower end of the waterproof sheet is fixed to the side of the sheet storage groove opposite the site or building.

[0037] According to 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, so the waterproof sheet is stable and easy to store. In addition, since the waterproof sheet is fixed to the outside of the pole when viewed from the site or building, rainwater that falls in the area surrounded 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 surrounded by the waterproof sheet.

[0038] The 12th flood prevention method is: 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 area including roads or pathways leading to said site or building and used by vehicles or people; 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 parts not including roads or passageways, 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.

[0039] 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. When flooded, 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, and 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 is spaced from the sheet fixing part throughout the waterproof wall, the waterproof sheet is easy to pull up, and even after it is pulled up, it extends diagonally toward the upper part of the support, making the waterproof sheet stable and easy to store.

[0040] 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.

[0041] According to the above configuration, when the lifting section is raised during use, the lid section also rises and opens at the same time, so there is no need to open the lid section manually, making it extremely easy to install the waterproof wall.

[0042] 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.

[0043] 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 its strength is increased compared to when there is no reinforcing member, and the height of the waterproof wall can also be increased.

[0044] 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.

[0045] 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.

[0046] In a sixteenth aspect of the present invention, in any one of the twelfth to fifteenth aspects of the present invention, 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.

[0047] According to the above-mentioned configuration, the waterproof sheet is supported by the beam members that are integral with the waterproof sheet, so that the upper end of the waterproof sheet is less likely to bend and the strength is increased compared to when there are no beam members, and the height of the waterproof wall can be increased. In addition, since the beam members are supported by multiple supports, the load applied to the waterproof sheet can be dispersed.

[0048] In a seventeenth aspect of the present invention, in any one of the twelfth to sixteenth aspects of the present invention, 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.

[0049] According to the above configuration, by pulling the wire, the pipe member or sealed portion through which the wire passes is pulled up, and the waterproof sheet on one side is pulled up. Therefore, even if the waterproof sheet is heavy, the waterproof wall can be easily and reliably installed. In addition, since the wire is passed 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. Effect of the Invention

[0050] As described above, according to the present invention, under normal circumstances, it is possible to enter and exit the premises or building without the waterproof sheet getting in the way, and in the event of flooding, the parts of the premises or building to be protected that need protection can be quickly covered with the waterproof sheet without having to carry a waterproof sheet from another location, thereby easily preventing flooding. [Brief description of the drawings]

[0051] [Figure 1A] FIG. 1 is a perspective view showing a stored state of a flood prevention system according to a first embodiment of the present invention. [Figure 1B] FIG. 1B is an enlarged perspective view corresponding to a portion IB of FIG. 1A. [Figure 1C] 1C is a cross-sectional view taken along line IC-IC in FIG. 1B. [Figure 1D] 1C is an enlarged perspective view taken along a cross section corresponding to line IC-IC in FIG. 1B. [Figure 1E] FIG. 1D is a partially enlarged cross-sectional view of FIG. [Figure 1F] 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 in use. [Figure 1G] FIG. 1C is an enlarged perspective view corresponding to the portion IG of FIG. 1F. [Figure 1H] FIG. 2 is an enlarged cross-sectional view showing the support pillars, the cover, and their surroundings when the flood prevention system according to the first embodiment of the present invention is in use. [Figure 2A]FIG. 4 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. [Figure 2B] FIG. 2B is an enlarged perspective view corresponding to a portion IIB of FIG. 2A. [Figure 2C] FIG. 2C is a cross-sectional view taken along line IIC-IIC in FIG. 2B. [Figure 2D] FIG. 4 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. [Figure 2E] FIG. 2E is an enlarged perspective view corresponding to a portion IIE in FIG. 2D. [Figure 3A] FIG. 11 is a perspective view showing a stored state of a flood prevention system according to a second embodiment of the present invention. [Figure 3B] FIG. 3B is an enlarged perspective view corresponding to a portion IIIB in FIG. 3A. [Figure 3C] FIG. 3C is a cross-sectional view taken along line IIIC-IIIC in FIG. 3B. [Figure 3D] FIG. 3C is an enlarged perspective view taken along a cross section corresponding to line IIIC-IIIC in FIG. 3B. [Figure 3E] FIG. 3D is an enlarged cross-sectional view of the lower part of FIG. 3C. [Figure 4A] FIG. 4 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. [Figure 4B] FIG. 4B is an enlarged perspective view corresponding to a portion IVB in FIG. 4A. [Figure 4C] FIG. 4C is a cross-sectional view taken along line IVC-IVC in FIG. 4B. [Figure 4D] FIG. 4B is an enlarged perspective view corresponding to the IVD portion of FIG. 4A. [Figure 4E] FIG. 4B is an enlarged perspective view of the IVE portion of FIG. 4A. [Figure 4F] FIG. 4F is a cross-sectional view of the IVF-IVF line in FIG. 4E. [Figure 4G] FIG. 4B is an enlarged perspective view of the IVG portion of FIG. 4A. [Figure 5A] 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. [Figure 5B] FIG. 5B is an enlarged perspective view corresponding to the VB portion of FIG. 5A. [Figure 5C] 5C is a cross-sectional view taken along the line VC-VC in FIG. 5B. [Figure 6A] 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. [Figure 6B] 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. [Figure 7A] FIG. 11 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. [Figure 7B] FIG. 11 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 being provided with a support pillar having a lifting section to which a lid section is connected all around. [Figure 8A] 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. [Figure 8B] FIG. 11 is an enlarged perspective view showing the corner supports and the waterproof sheet in the used state according to the fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0052] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0053] (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 built over 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 riverbank, lakeshore, 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.

[0054] In order to protect the opposite side of the river, which is the protected area, from flooding, the levee E is provided with a continuous sheet storage groove 2 along the levee E. The sheet storage groove 2 only needs to be provided in the area including the road R leading to the bridge B, and does not mean that the sheet storage groove 2 must be provided along the entire length of the river. Since the sheet storage groove 2 is basically provided along the river, in areas where the river bends, it may be provided so as to bend in the same way as the river, or so as to bend more gently than the river.

[0055] 1C, 1H, etc., in this embodiment, the sheet storage groove 2 has a flat bottom and a rectangular shape. Although not shown, the bottom may be inclined or a drain hole may be formed so that water accumulated in the sheet storage groove 2 can be smoothly drained.

[0056] The sheet storage groove 2 of this embodiment can be provided not only when a new embankment E is provided, but also as an additional embankment 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.

[0057] The sheet storage groove 2 includes a waterproof sheet fixing portion, and a lower end 3a of the waterproof sheet 3 that continuously covers the embankment E is fixed to its inner wall. In particular, in this embodiment, 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.

[0058] In addition, in areas where vehicles and people do not pass through, it is possible to not provide a groove 2 for storing a sheet, but to use the upper surface of the embankment E as the waterproof sheet fixing part, fix the lower end 3a of the waterproof sheet 3 with a mounting bracket 3b, and fold the waterproof sheet 3 flat and place it nearby, or store the waterproof sheet 3 in a box.

[0059] The waterproof sheet 3 is made of a sheet-like member and there are no particular restrictions on its material, thickness, etc. as long as it is waterproof and flexible; however, taking into consideration that it will be used outdoors for long periods 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.; and in order to increase waterproofness and strength against impact, so-called rubberized cloth is more preferable than a single sheet material.

[0060] A plurality of posts 4 for supporting the waterproof sheet 3 are provided in the vicinity of the sheet storage groove 2 (specifically, on the side of the embankment E opposite the river). In this embodiment, most of the posts 4 are posts with linear motion devices having 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 may be movable posts that can be inserted and removed like bollards.

[0061] In this embodiment, as shown in Figures 1B to 1E, the support column 4 with the linear motion device includes a ball shaft 4a and a support column body 4b that is provided concentrically with the ball shaft 4a and covers the ball shaft 4a. The ball shaft 4a is connected to a lifting section 4c that lifts and lowers the waterproof sheet 3, and the lifting section 4c is configured to be able to move up and down within a slit 4d formed in the support column body 4b by driving an electric motor 4e as a driving section. The driving section may be configured as an actuator driven by other fluids such as a hydraulic motor, a hydraulic cylinder, or a pneumatic cylinder, or by electricity.

[0062] The waterproof sheet 3 can be fixed at its bottom end 3a to the sheet storage groove 2, and can also be pulled up by the lifting section 4c, with its top fixed 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 may be folded in a zigzag pattern and stacked one above the other. In some cases, it may also be rolled up for storage. As described 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 method of fixing is not particularly limited.

[0063] 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 lid with no holes, but in some cases it may be configured with holes like a grating. In the case of a plate-like lid with no holes, it is preferable that the surface is uneven to prevent slipping. The lid 10 has a support opening 10a to avoid the cylindrical support 4.

[0064] In this embodiment, as shown in Fig. 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 Figs. 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. Then, 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.

[0065] In the flood control system 1, when the lifting section 3c 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.

[0066] -How to form 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.

[0067] 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 that people, bicycles, and the like do not get in the way when passing along the river.

[0068] When flooded, 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 lid 10 is opened while the waterproof sheet 3 is pulled up from the sheet storage groove 2, 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 while 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.

[0069] As a result, the beam members 6 are supported so as to straddle the multiple supports 4, and a waterproof wall 20 is continuously formed by the waterproof sheets 3, as shown in FIG. 1F.

[0070] On the other hand, when the possibility of flooding has decreased and it is time to store the waterproof sheet 3 again, the lifting section 4c is returned from the use position to the stored position, the waterproof sheet 3 is lowered from the multiple supports 4, folded and stored in the sheet storage groove 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.

[0071] 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 a case in which the beam members 6 are not present, and the height of the waterproof wall 20 can be increased. In addition, the beam members 6 are supported by multiple supports 4, so the load applied to the waterproof sheet 3 can be dispersed.

[0072] In this embodiment, the poles 4 are spaced apart from the part where the sheet is fixed (the mounting bracket 3b part), so the waterproof sheet 3 can be easily pulled up, and as shown in Fig. 1H, even after being pulled up, the waterproof sheet 3 extends obliquely toward the upper part of the poles 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 part, so the load applied to the poles 4 is also reduced.

[0073] As described above, according to this embodiment, under normal circumstances, the waterproof sheet 3 can be used to pass over the 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.

[0074] -Variations- 2A to 2E show a flood prevention system 1' according to a modified example of embodiment 1 of the present invention, which differs from embodiment 1 above in particular in the configuration of the cover part 10'. Note that in the following modified examples and embodiments, the same parts as in Figs. 1A to 1H are denoted by the same reference numerals and detailed description thereof will be omitted.

[0075] In this modification, 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 post opening 10a' is circular, as shown in Fig. 2B etc. A beam member 6 may be inserted into the upper end of the waterproof sheet 3, as in the first embodiment.

[0076] 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 with the lid 10', so that it does not hinder the passage of vehicles or people.

[0077] When the lifting portion 4c is raised, the cover portion 10' is also raised, and the upper end of the waterproof sheet 3 is also pulled up.

[0078] When the lifting section 4c rises to the use position as shown in Fig. 2E, a waterproof wall 20' is formed by the waterproof sheet 3 as shown in Fig. 2D. At this time, since the cover section 10' is located above the support pole 4, it is not leaning against the waterproof sheet 3 and does not apply a load to the support pole 4.

[0079] When the lifting section 4c is lowered to store the waterproof sheet 3, the waterproof sheet 3 is also folded. The folding method of the waterproof sheet 3 may be devised so that it is folded automatically.

[0080] In this manner, in this modified example as well, the waterproof wall 20' can be formed quickly and easily to prevent flooding from the river.

[0081] (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.

[0082] - Flood prevention system configuration - A flood prevention system 101 according to the second embodiment of the present invention is provided with a sheet storage groove 102 including a waterproof sheet fixing portion that is continuously dug in a polygonal shape (rectangular shape in this embodiment) in a plan view.

[0083] 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 or the like as an evacuation site, surrounding farmland to prevent the occurrence of diseases in agricultural crops due to flooding or inundation, etc. If other waterproof structures such as block walls are installed, it is sufficient to surround only the parts where those structures are not installed.

[0084] For example, as shown in Fig. 4A, the sheet storage groove 102 is provided in a rectangular shape so as to surround the building P, but it may be provided in another polygonal shape to match the shape of the site A of the building P. As shown in Figs. 3C and 3E, a waterproof sheet 103 that, when pulled up, forms a waterproof wall 120 (shown in Fig. 4A) that is a continuous polygon in plan view, is stored in the sheet storage groove 102 so as to be folded. Although not shown in detail, when folding the waterproof sheet 103, it is folded so that the waterproof sheet 103 can be appropriately pulled out, particularly at the corners. The folding is performed appropriately depending on the angle of the corners, the thickness of the waterproof sheet 103, etc.

[0085] 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 during flooding.

[0086] 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 suspended from the upper parts. The number of supports 104, 104' may be more or less than this.

[0087] 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 concentrically disposed about the ball shaft 104a and covers the ball shaft 104a, as in the above-described embodiment 1. A lifting unit 104c that lifts 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 driving unit, so that the waterproof sheet 103 can move up and down within a slit 104d (shown in FIG. 3B) formed in the support body 104b.

[0088] As shown in Fig. 4B, similarly 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.

[0089] 3E, a 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 to be protected by the sheet storage groove 102. The waterproof sheet 103 is stored in the sheet storage groove 102 in a manner that wraps around the entire groove.

[0090] In this embodiment, as shown in Fig. 3A, the pillars other than the pillars 104 around the entrance 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 a number of fixed beams to serve as a fence surrounding the building P. When flooded, the waterproof sheet 103 is pulled up and the upper part is fixed to the fixed pillars 104'.

[0091] 4D and 4E, in the fixed pole 104', a sealed portion 103c is provided at the upper end of the waterproof sheet 103, 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.

[0092] As shown in Fig. 4D, an engagement recess 107 is formed at the upper end of the fixed support 104' in the straight section, and as shown in Fig. 4G, an engagement recess 107' having 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 engages with these engagement recesses 107, 107', so that the waterproof sheet 103 is suspended from the beam member 106.

[0093] When in use (when flooded), as shown in Figs. 4B, 4C and 4F, the waterproof sheet 103 is pulled up so as to be inclined upward toward the upper part of the posts 104, 104'.

[0094] 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 supports 104, 104', so that a continuous waterproof wall 120 is formed by the waterproof sheet 103.

[0095] -Waterproofing method- Next, a flood prevention method according to this embodiment will be described.

[0096] As shown in Fig. 3A, when flood prevention system 101 is not in use, such as during normal times (ordinary times), waterproof sheets 103 are stored in sheet storage grooves 102 in and around passage G on the side of entrance / exit D, and are covered with lids 110. Additionally, no supports 104 are provided around entrance / exit D of building P. This provides a good appearance and does not impede entry or exit to building P. Meanwhile, the other fixed supports 104' are always installed in an upright position, and serve as a fence.

[0097] When using the device (when submerged in water), first, the lid 110 is removed from the fixed pole 104'. For example, the lid 110 is placed near the fixed pole 104'.

[0098] 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. As 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 as to be inclined toward the upper side of the fixed posts 104', as shown in Figure 4F.

[0099] This work is first carried out within the range of the fixed support 104'. This allows people to enter and exit the building P until the building P is completely covered.

[0100] Next, the electric motor 104e of the support 104 around the passage leading to the entrance D of the building P is driven. For example, if the electric motor 104e is driven by sending a signal from a mobile communication device such as a smartphone to a control panel (not shown), the lifting unit 104c can be safely operated from a safe position.

[0101] 4B, the lid 110 is pushed up by the pulled-up waterproof sheet 103. When the lifting / lowering part 104c starts to rise, as shown in an enlarged view in FIG. 4B, the waterproof sheet 103 is fixed to the upper part of the support 104.

[0102] In this way, waterproof wall 120 having continuous sloping side walls with a rectangular cross section can be completed quickly without carrying supports 104, 104' and waterproof sheet 103 from another storage location, with corners bent at fixed supports 104' in a plan view around site A or building P, as shown in Fig. 4A. Note that a pattern or the like may be drawn on the outer peripheral surface of waterproof wall 120 to prevent the appearance from being impaired.

[0103] 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 having a polygonal shape in a plan view that continuously covers the periphery of the site A or building P.

[0104] Furthermore, since the waterproof sheet 103 is supported via the beam members 106 that span the upper parts of the multiple supports 104, 104', the strength is increased and the height of the waterproof wall 120 can also be increased.

[0105] Furthermore, it is desirable to leave at least a width for vehicles to pass through the pillars 104 on and around the passage G. 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.

[0106] 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 can be easily pulled up, and even after being pulled up, the waterproof sheet 103 extends obliquely toward the upper parts of the posts 104 and the fixed posts 104', so that the waterproof sheet 103 is stable and easy to store. Also, rainwater that falls within the area enclosed by the waterproof sheet 103 can be drained into the sheet storage groove 102.

[0107] 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 parts of the site A or building P that need to be protected can be quickly and safely covered with the waterproof sheet 103 to prevent flooding, without the need to transport the supports 104, 104' or the waterproof sheet 103 from another location.

[0108] In addition, in this embodiment, minor flooding that does not qualify as "flooding above floor level or flooding exceeding 45 cm above 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.

[0109] In the above-mentioned second embodiment, the waterproof wall 120 is provided in a rectangular shape in plan view, but it may also include a curved shape such as a circle, an ellipse, or an oval in plan view. In addition, when 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 perimeter. In such a case, the sheet storage groove 102 and the support posts 104, 104' may be arranged according to the shape. Furthermore, when a part is recessed in plan view, the support posts 104, 104' may be arranged at the corner part on the opposite side to the site or building to be protected (outside the waterproof sheet 103). In this 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.

[0110] -Variations- 5A to 5C show a flood prevention system 101' according to a modified example of embodiment 2 of the present invention, and differs from embodiment 2 above in particular in the configuration of the cover part 110'. Note that in the following modified examples and embodiments, the same parts as those in FIGS. 3A to 4G are given the same reference numerals and detailed description thereof will be omitted.

[0111] In this modification, the lid 110' is configured to move up and down together with the lifting part 104c. The lid 110' moves up and down together with the lifting part 104c, so the post opening 110a' is circular. A beam member 6 may be inserted into the upper end of the waterproof sheet 103, as in the second embodiment.

[0112] In this modified example, in a stored state (not shown), the waterproof sheet 103 is stored in the sheet storage groove 102 and covered with the lid 110', so that it does not impede the passage of vehicles or people.

[0113] When the lifting section 104c is raised, the cover section 110' is also raised, and the upper end of the waterproof sheet 103 is also pulled up.

[0114] 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, since the lid section 110' is on the upper side of the support 104, it is not leaning against the waterproof sheet 103 and does not apply a load to the support 104.

[0115] When the lifting / lowering 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.

[0116] In this manner, in this modified example as well, the waterproof wall 120' can be formed quickly and easily to prevent flooding from the river.

[0117] (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'.

[0118] -Flood prevention system configuration- As shown in FIG. 6B, a flood prevention system 201 according to the third embodiment of the present invention also includes a sheet storage groove 102 having a waterproof sheet fixing portion that is continuously dug into a rectangular shape in a plan view, similar to the second embodiment.

[0119] In this embodiment, pillars 104 having lifting and lowering parts 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 parts 210' corresponding to the pillars 104 at the corners may have a shape different from that of the other lid parts 110, and the pair of lid parts 210' at the corners may open as the lifting and lowering part 104c rises.

[0120] In this embodiment, under normal circumstances, as shown in FIG. 6A, all of the posts 104 and waterproof sheets 103 are stored and covered with lids 110, 210', so that it looks good and passage is possible not only along passage G but all around.

[0121] In the event of flooding, first, the lifting sections 104c of all of the pillars 104 except for 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.

[0122] 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 lifted up.

[0123] As a result, as shown in FIG. 6B, a waterproof wall 220 is formed continuously by the waterproof sheet 103 in the same manner as in the second embodiment.

[0124] Therefore, even in this embodiment, under normal circumstances, one can enter and exit the site A or building P through the passage G without the waterproof sheet 103 or the supports 104 getting in the way, and in the event of flooding, the parts of the site A or building P that need to be protected can be quickly covered with the waterproof sheet 103 to easily prevent flooding, without having to carry the supports 104 or waterproof sheet 103 from another location.

[0125] -Variations- 7A and 7B show a waterproof 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 part 110'.

[0126] In this modification, 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 post 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 modification, the lid 210'' at the corner is particularly L-shaped and is moved up and down by a single lifting section 104c.

[0127] In this modified example, in a stored state (not shown), the waterproof sheet 103 is stored in the sheet storage groove 102 and covered with the lid 110', so that it does not impede the passage of vehicles or people.

[0128] When the lifting section 104c is raised, the lid sections 110', 210'' are also raised, and the upper end of the waterproof sheet 103 is also pulled up.

[0129] When the lifting section 104c rises to the use position, a waterproof wall 220' is formed by the waterproof sheet 103, as shown in Fig. 7B. At this time, the lid sections 110', 210'' are located above the support pole 104 and are not leaning against the waterproof sheet 103, so no load is applied to the support pole 104.

[0130] When the lifting / lowering section 104c is lowered to store the waterproof sheet 103, the waterproof sheet 103 is also folded. The folding method of the waterproof sheet 103 may be devised so that it is folded automatically.

[0131] In this manner, in this modified example as well, the waterproof wall 220' can be formed quickly and easily to prevent water from entering the building P and the site A.

[0132] (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 303c at the upper end of a waterproof sheet 303. FIG.

[0133] The wire 306 passes continuously through the sealed portion 303c of the waterproof sheet 303 (which may be a pipe member inserted into the sealed portion) so as to straddle the multiple supports 304.

[0134] Although not shown, pulleys may be provided on the upper portions of at least some of the multiple support columns 304. The wire 306 may be connected to an electrically or hydraulically driven winch via the pulleys.

[0135] The wire 306, including its straight and corner portions, is engaged by being fitted into the engaging recesses 307, 307' at the upper ends of the posts 304, thereby making it difficult for the wire 306 to come loose, but the wire 306 itself may be movable in its axial direction.

[0136] 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.

[0137] In this way, the waterproof wall can be easily and reliably installed even with a heavy waterproof sheet 303. In addition, since the wire 306 is passed through a 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.

[0138] It should be noted that the above-described embodiments are essentially preferred examples, and are not intended to limit the scope of the present invention, its applications, or uses.

[0139] (Other embodiments) The present invention may be configured as follows with respect to the above embodiment.

[0140] 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.

[0141] In that case, if a storage space for the lifting unit 4c, 104c is provided, the installation space for the support column 4, 104 can be reduced, and the cover unit 10, 110 can be made smaller, which is advantageous. It is advisable to secure a space for passing electric wires connected to the electric motor 4e, 104e from the seat storage groove 2, 102 to the support column 4, 104.

[0142] 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. [Explanation of symbols]

[0143] 1,1',101,101',201,201',301 Flood control system 2,102 Seat storage groove 2a Lid recess 3,103,303 Tarpaulin 3a,103a bottom 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 Post 306 Wire Site A B Bridge section D Entrance / Exit E. Embankment F fence G aisle P Building R road

Claims

1. 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 portion that can be opened and closed to cover the sheet storage groove portion; 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 provided separately from the lid unit and configured to drive 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, When flooded, the lifting section is raised from the storage position by the drive section, the lid section is opened to pull up the waterproof sheet from the sheet storage groove section, and the lifting section is moved to a usage position so that an upper portion of the waterproof sheet is fixed to the plurality of posts. A flood prevention system characterized by:

2. 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 passage.

2. The flood control system according to claim 1.

3. 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 3. A flood prevention system according to claim 1 or 2.

4. 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 flooded, the waterproof sheet is pulled up and bent at the portion of the support pillar at the corner of the site or building, and fixed to the upper part of the support pillar, so that a continuous waterproof wall is formed by the waterproof sheet.

3. A flood prevention system according to claim 1 or 2.

5. In the portion where there is no road or passage, the support pillar is a fixed support pillar not having the lifting part, In the event of flooding, the waterproof sheet is pulled up and the upper part is fixed to the fixed pole.

3. A flood prevention system according to claim 1 or 2.

6. The lid is fixed to the lifting section and configured to move up and down together with the lifting section.

3. A flood prevention system according to claim 1 or 2.

7. 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.

3. A flood prevention system according to claim 1 or 2.

8. The lid portion is configured to be lifted by the waterproof sheet that is pulled out by the lifting portion.

3. A flood prevention system according to claim 1 or 2.

9. 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.

3. A flood prevention system according to claim 1 or 2.

10. A pipe member or a sealed portion is provided on the upper portion of the waterproof sheet, A wire is passed through the pipe member or the sealed portion, The waterproof sheet is suspended from the pole via the wire.

3. A flood prevention system according to claim 1 or 2.

11. The lower end of the waterproof sheet is fixed to the opposite side of the sheet storage groove from the site or building.

3. A flood prevention system according to claim 1 or 2.

12. 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 lifting section is raised by a drive section provided separately from the lid section, the lid section is opened, and the waterproof sheet is pulled up and supported on the upper part of the support pole, thereby forming a waterproof wall that continuously covers the site or building with the waterproof sheet. A waterproofing method comprising:

13. The lid portion is connected to the lifting portion, When the lifting section is raised, the lid section also rises.

13. The method of claim 12.

14. The lid portion is connected to the upper end of the waterproof sheet to serve 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.

14. The method of claim 13.

15. The lid is lifted by the waterproof sheet that is lifted by the lifting unit.

13. The method of claim 12.

16. 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 tops of a plurality of posts, thereby forming a continuous waterproof wall using the waterproof sheet.

13. The method of claim 12.

17. A pipe member or a bag-sealing portion is provided on the upper portion of the waterproof sheet, Pass a wire through the pipe member or the sealed portion, The waterproof sheet is suspended from the support via the wire.

13. The method of claim 12.

18. The cover portion is formed with an opening for a support so as to avoid the support.

3. A flood prevention system according to claim 1 or 2.

19. The cover portion is configured to be movable up and down together with the lifting portion so as to avoid the support inside the support opening.

20. The flood control system according to claim 18.

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