Floating bag body flap gate and waterproof method using the same

Abstract

The floating bag body flap gate (1) generates buoyancy in the expansion member (10) when rainwater (W) enters the side ditch (2) and the water level (H) rises. With the expansion member fixing part (3) as the fulcrum, the expansion member rotates and stands up to float, forming a waterproof wall. By maintaining a high weir height through the bag structure of the expansion member and mooring at the fixing part, when the rainwater level fills the side ditch, the center of gravity (O) of the expansion member filled with gas (A) is located outside the inner side (S1) side surface position of the side ditch site. And when the level of the invading rainwater rises above the side ditch, a tensile load is generated on the free end part (11a) of the base end part (11) that is not fixed at the fixing part. Due to the elastic restoring force caused by the tensile load, the expansion member is pulled back in the direction of the outside of the site (S2). When the rainwater level drops to a state where it fills the side ditch, the center of gravity of the expansion member is located outside the inner side surface position of the side ditch site, so that the expansion member is automatically stored in the side ditch without power.

Description

Technical Field

[0001] The present invention relates to a floating bag body flap gate and a waterproofing method using the same.

Background Art

[0002] Efforts for basin water control are being promoted mainly for specific urban rivers by countries and local governments. However, conventional measures such as raising the height of river levees require enormous time and costs and can only be carried out for rivers with a considerably high risk.

[0003] On the other hand, due to abnormal weather caused by global warming, floods due to the occurrence of linear precipitation bands occur somewhere every year, and it is not surprising that floods occur in rivers and water channels anywhere in the country.

[0004] In particular, public facilities such as hospitals, welfare facilities, and government offices, and large-scale facilities such as large shopping centers are facilities that help the lives of disaster victims. If their functions are lost due to disasters, the situation becomes more serious. Therefore, there is a strong demand for devices to prevent the facilities from being flooded.

[0005] Conventionally, as a means to prevent the loss of functions due to flooding of such facilities, measures have been taken to attach sandbags, water bags, water stop plates, etc. to the entrances of buildings.

[0006] However, in large facilities, there are many buildings and entrances. To attach sandbags, water bags, water stop plates, etc. to all of them, a large number of people and a lot of time are required. Especially in recent heavy rains, flooding may occur in a short time of several tens of minutes. There is no time to attach sandbags, water bags, water stop plates, etc. to all the entrances, and it is also difficult to secure personnel.

[0007] On the other hand, considering the risk information of weather forecasts, it may be possible to attach sandbags, water bags, water stop plates, etc. to the entrances in advance if there is any risk. However, in most cases, flooding does not occur even if they are actually attached, and attaching them will interfere with the operations of hospitals, government offices, and the business of shopping centers. Therefore, it is also difficult to install them in advance considering the risk.

[0008] As a means of solving the above problems in the installation of sandbags, water bags, water stop plates, etc. at the entrance and exit, a floating flap gate has been proposed and partially implemented (for example, Patent Documents 1 and 2).

[0009] The floating flap gate is an automatic rising and falling waterproof gate installed at the entrance and exit of a building. When water floods into the entrance of the building, buoyancy is generated on the rising and falling door body, causing it to rise and the door body to become a waterproof wall.

[0010] Door stops are provided on both sides of the door body, and a seal member for waterproofing is attached.

[0011] Normally, although the door body made of a rigid metal has an air chamber inside, its weight is heavy, and the sliding resistance with the door stop due to the above seal member is also large. Since it cannot stand up only by the buoyancy of the door body itself, a counterweight is suspended inside the door stop at the end of the door body to assist in standing up.

[0012] In addition, a stopper and a mooring member are provided so that the standing door body with weight does not fall over beyond 90 degrees.

[0013] With the above configuration, there is no need to manually install and remove sandbags, water bags, water stop plates, etc. every time as in the conventional case.

Prior Art Documents

Patent Documents

[0014]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0015] However, such a waterproof device has a very complex hinge structure for raising and lowering a rigid and heavy door body, requiring high-precision processing. In addition, in order to prevent water leakage at the hinge part, it is necessary to separately attach a waterproof sheet, but an additional structure is required to prevent water leakage due to sagging of the sheet rubber at the joint between the waterproof sheet and the door body, resulting in very high costs.

[0016] Furthermore, in large-scale facilities, it is difficult to install it at all entrances and exits exceeding 100. Moreover, even if it is installed at all entrances and exits, there is a problem that emergency vehicles, official vehicles, etc. parked in the parking lot will be submerged, hindering the recovery.

[0017] Therefore, instead of the entrances and exits of individual buildings, an automatic rising and falling type waterproof device that covers the entire site of the facility at once and does not require prior installation is required.

[0018] In response to such requirements, if the above-mentioned conventional floating flap gate is to be installed, it is necessary to connect a plurality of door bodies made of rigid metal, so an additional sealing structure at the connection part and the installation of a plurality of door stops and counterweights are required, which becomes extremely costly to cover the perimeter of a facility with a large site.

[0019] The present invention solves the above problems of the prior art, proposes an automatic rising and falling type waterproof device that covers the entire site of the facility at once and does not require prior installation, and further proposes a bag type flap gate that is extremely simple, low-cost, and highly reliable compared to the conventional floating flap gate.

Means for Solving the Problems

[0020] In order to achieve the above object, the first invention is directed to a floating bag flap gate for preventing flooding of a site due to heavy rainstorms. The floating bag flap gate a side groove or a water storage tank installed around the site for preventing flooding, and An expansion member fixing part continuously installed inside the site of a side ditch or a water storage tank, It is composed of an expansion part filled with gas inside and an expansion member in the shape of a long bag having a base end part continuously and watertightly fixed to the expansion member fixing part. When rainwater intrudes into the side ditch or the water storage tank and the water level rises, buoyancy is generated in the expansion member, and the expansion member stands up while rotating, so that a floating waterproof wall is formed. The high weir height is maintained by the bag structure of the expansion member and the mooring at the expansion member fixing part. In a state where the water level of the intruding rainwater fills the side ditch or the water storage tank, the center of gravity of the expansion member filled with gas is located outside the inner side surface position of the site of the side ditch or the water storage tank. Moreover, when the water level of the intruding rainwater rises above the side ditch or the water storage tank, a tensile load is generated in the free base end part of the expansion member that is not fixed by the expansion member fixing part among the base end parts of the expansion member. Due to the elastic restoring force of the free base end part caused by the tensile load, the expansion member is pulled back in the direction outside the site, and when the water level of the rainwater drops to the water level that fills the side ditch or the water storage tank, the center of gravity of the expansion member is located outside the inner side surface position of the site of the side ditch or the water storage tank, so that the expansion member is configured to be automatically stored in the side ditch or the water storage tank without power.

[0021] According to the above configuration, the floating flap gate does not have a rigid door body like the conventional ones, and since a lightweight expansion member filled with gas forms a waterproof wall, it does not have a high-rigidity hinge part that requires high workability to support a heavy rigid door body, nor does it require an additional seal member that requires high-precision processing and installation to prevent rainwater leakage at the base end part. Also, an urging mechanism such as a counterweight for floating a heavy rigid door body is not required. Also, a stopper member and a mooring member provided so that the heavy rigid door does not fall to the opposite side after rising are not required. Furthermore, a door stop provided at both left and right ends of the heavy rigid door body and a seal member provided to prevent rainwater W leakage from the sliding part between the door body and the door stop are not required.

[0022] The second invention is the first invention, wherein having a corner of the side groove or the water storage tank that bends in a direction surrounding at least one location of the site, the expansion member is configured to stand up while rotating simultaneously with the straight portion also at the corner to continuously form a waterproof wall and to be automatically stored in the side groove or the water storage tank, at the corner, a vulcanization joint or a sandwich joint with a long and narrow plate material is made such that the length of one side in the longitudinal direction of the expansion member becomes longer from the base end portion toward the tip end portion, the base end portion is continuously fixed to the expansion member fixing portion across the corner.

[0023] According to the above configuration, the expansion member does not receive an excessive tensile load during the installation state in the side groove or the water storage tank and the undulating process, and although the expansion portion is compressed during the undulating process to the fully standing state, the gas at the corner and the expansion member near the tip move as a whole from the corner toward the central position, so that even when the expansion member is fully stood up and compressed, there is no occurrence of a decrease in the weir height due to bending or large wrinkles at the corner of the expansion member, and the continuous waterproof wall including the corner is erected and automatically stored.

[0024] A third invention is, in the second invention, when the bending angle on the inner side of the site of the side groove or the water storage tank at the corner is α, the joint angle β on the base end side of the sandwich joint at the corner of the expansion member is (360-α) / 2 - 22.5 ≦ β ≦ (360-α) / 2 + 22.5 and is set within the range of the configuration.

[0025] When the joint angle β is less than (360 - α) / 2 - 22.5, the tensile load generated in the longitudinal direction during the erection of the stored expansion member increases, and there is a concern about damage due to the elongation of the expansion member. Also, when the joint angle β exceeds (360 - α) / 2 + 22.5, no tensile load is generated during erection, but the compression amount near the tip of the expansion member at maximum erection becomes too large, and there is a concern that wrinkles will occur near the tip and a stable weir height cannot be maintained. On the other hand, according to the above configuration, such problems do not occur, and the expansion and collapse can be performed without trouble, and the weir height can be maintained during erection.

[0026] In the fourth invention, in the first invention, It has a corner of the side groove or water storage tank that bends in a direction surrounding at least one place of the site, At the corner, it stands up while rotating simultaneously with the straight part to continuously form a waterproof wall, and is configured to be automatically stored in the side groove or water storage tank, The end face of the expansion member butted in the longitudinal direction and a flexible rubber sheet for corner protection are sandwiched and jointed by a plate material.

[0027] According to the above configuration, since a flexible rubber sheet at an appropriate angle is connected to the end face of the expansion member butted in the longitudinal direction across the corner, the expansion member and the flexible rubber sheet do not receive an excessive tensile load during the installation state in the side groove or water storage tank and the undulating process. During the process of undulating to the fully erected state, the flexible rubber sheet deforms according to the undulating angle, so when two joint plates arranged in the longitudinal direction stand up and line up at the corner in the fully erected state, there is no occurrence of a decrease in the weir height due to bending or large wrinkles in the expansion member and the flexible rubber sheet at the corner, and the continuous waterproof wall including the corner is erected and automatically stored. Thereby, even at the corner of the site, a waterproof wall can be continuously installed with an extremely simple structure, and the site can be inexpensively protected from rainwater.

[0028] In the fifth invention, in the first invention, The bendable free base end length Lf is 20% or more and 150% or less of the shortest winding distance Lmin from the end of the expansion member fixing part to the inner side ground surface of the side groove or the water storage tank.

[0029] When the free base end length Lf exceeds 150% of the shortest winding distance Lmin and becomes extremely long, the elastic restoring force of the base end 11 may disappear and the expansion member may not be automatically stored. Also, when the free base end length Lf is less than 20% of the shortest winding distance Lmin, the expansion member may be pulled from the expansion member fixing part and the standing height of the expansion member may become low. However, according to the above configuration, the elastic restoring force of the base end can be maintained and the expansion member can be automatically stored, and the lowering of the standing height of the expansion member can be suppressed.

[0030] In the sixth invention, in the fifth invention, The free base end length Lf is a length of 70% or more and 100% or less of the shortest winding distance Lmin.

[0031] According to the above configuration, stable automatic storage can be achieved and a high weir height can be maintained.

[0032] In the seventh invention, in the fifth or sixth invention, An inclined part is provided inside the site of the side groove, and in the fully standing state of the expansion member when the water level rises to the maximum, the free base end length Lf is set at a position where the bottom of the expansion member is placed on the inclined part. When the water level drops, the expansion member rolls down the inclined part by its own weight, so that when the rainwater level drops to the level that fills the side groove or the water storage tank, the center of gravity of the expansion member is located outside the inner side surface position of the side groove or the water storage tank, and the expansion member is configured to be automatically stored in the side groove or the water storage tank without power.

[0033] According to the above configuration, in addition to the elastic restoring force of the free base end, the self - weight of the expansion member due to the inclined part can also be utilized, so that the expansion member can be more easily and automatically stored without power.

[0034] In the eighth invention, in any one of the first to seventh inventions, the expansion part has a hollow structure, and the integrally formed base end part has a solid structure, with the base end part protruding from the expansion part in a state where the expansion part is filled with gas.

[0035] According to the above configuration, the risk of gas leakage due to insufficient tightening at the expansion member fixing part is eliminated, and the attachment becomes easy.

[0036] In the ninth invention, in any one of the first to eighth inventions, the expansion part has a hollow structure, and the integrally formed base end part has a solid structure, and further has a solid-structured tip part integrally formed, with the tip part protruding from the expansion part in a state where the expansion part is filled with gas, and configured such that the tip part is at a position higher than the expansion part in a state where the maximum water level is reached.

[0037] According to the above configuration, while raising the maximum weir height, the rigidity of the tip part is increased to prevent a partial decrease in the weir height due to wrinkles or bending of the expansion part.

[0038] In the tenth invention, in any one of the first to ninth inventions, the expansion part and the base end part of the expansion member are composed of a rubber material integrally formed without a joint.

[0039] According to the above configuration, the base end part has a configuration protruding from the expansion part, and damage to the expansion member can be prevented without generating excessive shear force at the base end part root position.

[0040] In the eleventh invention, in the tenth invention, the expansion part has a reinforcing cloth embedded over the entire inner circumference.

[0041] According to the above configuration, it can withstand a higher air pressure.

[0042] In the 12th invention, in the 10th invention, A reinforcing cloth is continuously embedded from the inflating portion to the base end portion.

[0043] According to the above configuration, when a higher weir height is required, the total water pressure applied to the inflating member by the invading rainwater becomes very large. Therefore, even when a large tensile load is generated at the base end portion of the inflating member, it is possible to prevent the reinforcement of the base end portion and the breakage at the root of the base end portion. By embedding the reinforcing cloth up to the tip portion, the rigidity of the tip portion is increased, and it is possible to prevent the tip portion from falling and overtopping due to the branches and leaves of the trees flowing together with the rainwater.

[0044] In the 13th invention, in any one of the 1st to 12th inventions, The inflating member has a gas insertion port communicating with the inflating portion, and a hose is connected to the gas insertion port so that gas can be filled.

[0045] According to the above configuration, when there is a decrease in gas pressure over time, it is possible to increase the pressure easily and quickly.

[0046] In the 14th invention, in any one of the 1st to 13th inventions, The inflating member is in the form of a single sheet, and the base end portions corresponding to both ends of the sheet are overlapped and simultaneously tightened and fixed by the inflating member fixing portion to form a hollow inflating portion. By putting a support container for holding gas such as a plurality of foams or a hollow frame body into the inflating portion, the shape of the inflating portion is maintained, and further, a flat surface by the inflating member is formed on the upper surface of the side groove or the water storage tank.

[0047] According to the above configuration, in the installed state, a flat surface by the inflating member can be formed on the upper surface of the side groove, so that it is possible to effectively prevent people and objects from falling and dropping into the side groove.

[0048] In the 15th invention, in the 14th invention, When the maximum water level is nearly reached and the expansion member stands up greatly, a protrusion is provided at the lower part of the expansion member and a stopper is provided on the outer side surface of the site of the side ditch or the water storage tank so that the center of gravity of the expansion member does not become inside the inner side surface position of the site of the side ditch or the water storage tank.

[0049] According to the above configuration, by making the protrusion abut against the stopper to stabilize the standing position of the expansion member, when the maximum water level is nearly reached and the expansion member stands up greatly, the center of gravity of the expansion member is kept outside the inner side surface position of the site of the side ditch or the water storage tank. Thus, when the water level of rainwater drops, the expansion member is automatically and surely stored inside the side ditch or the water storage tank without power.

[0050] In the 16th invention, in any one of the 1st to 15th inventions, the expansion member fixing part is provided at the upper part of the inner side surface of the site of the side ditch or the water storage tank.

[0051] According to the above configuration, the length of the base end part can be made as short as possible, and it becomes easy to configure so that the expansion member is automatically stored in the side ditch or the water storage tank without power when the rainwater recedes.

[0052] In the 17th invention, in any one of the 1st to 16th inventions, a protective member is provided which has a fulcrum on the ground on the outer side of the site of the side ditch or the water storage tank, is provided to cover the side ditch or the water storage tank in normal times, stands up when the expansion member stands up, allows rainwater to permeate and blocks driftwood, and prevents the driftwood from colliding with the expansion member. Pushed up by the floating of the expansion member due to the intrusion of rainwater, the protective member stands up to form a protective wall, and due to the lowering of the expansion member accompanying the lowering of the water level, the protective member falls down by its own weight, so that the expansion member and the protective member are configured to automatically return to the original state before the rainwater intrudes without power.

[0053] According to the above configuration, during normal times, vehicles and people can pass over the protective member, so the expansion member is less likely to be damaged. When the expansion member expands, it is lifted by the expansion member to form a protective wall that prevents floating logs from colliding with the expansion member. When the water level drops, it returns to its original state without power. Also, since rainwater can pass through, excessive pressure is not generated on the protective member, and the expansion member is not crushed. Therefore, it can be made lightweight and low-cost.

[0054] In the 18th invention, in the 17th invention, The fulcrum position and length of the protective member are set such that the tip position of the protective member exceeds the outer peripheral tangent of the expansion member in a state where the expansion member is fully erected before the rainwater reaches the maximum water level.

[0055] According to the above configuration, when the water level drops and the expansion member is automatically stored in the side groove, the tip of the protective member is not caught by the expansion member, and the protective member can also be closed automatically without power.

[0056] In the 19th invention, in the 17th or 18th invention, The protective member is a grating made of a lightweight material such as wood or resin.

[0057] According to the above configuration, since the weight of the protective member is light and it floats in water, it does not become a resistance to the expansion member, and the protective member can be easily lifted. Also, in the case of wood, it is excellent in landscape as a cover for the side groove during normal times, and it also leads to CO2 reduction because it is a biomass material.

[0058] In the 20th invention, in the 1st or 17th invention, A metal cover having a fulcrum outside the side groove site is attached to the vehicle passage part crossing the side groove or water storage tank, Biasing means such as a counterweight or a hydraulic cylinder is provided to assist in lifting the vicinity of the tip of the metal cover inside the side groove site when the expansion member stands up.

[0059] According to the above configuration, during normal times, since it is a metal cover with high rigidity, even large-sized vehicles can pass through. On the other hand, when there is a risk of flooding, the metal cover may be removed in advance. However, although it has high rigidity, it is heavy, requires heavy machinery, and takes time and manpower. Therefore, by providing biasing means such as a counterweight or a hydraulic cylinder to assist the standing of the metal cover that can be opened and closed when the expansion member stands up, it can be easily opened and closed when the expansion member stands up and falls down.

[0060] In the 21st invention, in the 20th invention, the metal cover is permeable to rainwater such as gratings, and when it stands up, it blocks large driftwood as a protective member to prevent large driftwood from colliding with the expansion member.

[0061] According to the above configuration, when the metal cover stands up, it can block large driftwood as a protective member to prevent large driftwood from colliding with the expansion member.

[0062] In the 22nd invention, A waterproof method using a floating bag flap gate for preventing flooding of the site due to heavy rain is targeted. The waterproof method includes a side groove or a water storage tank installed around the site to prevent flooding, and an expansion member fixing part continuously installed inside the side groove or the water storage tank on the inner side of the site, and preparing a floating bag flap gate composed of an expansion part filled with gas inside and an expansion member in the shape of a long bag having a base end part continuously and watertightly fixed to the expansion member fixing part, when rainwater invades the side groove or the water storage tank and the water level rises, buoyancy is generated in the expansion member, and the expansion member stands up while rotating to float and form a waterproof wall, in a state where the invading rainwater fills the side groove or the water storage tank, the center of gravity of the expansion member filled with gas is located outside the inner side surface position of the side groove or the water storage tank on the inner side of the site, Moreover, when the water level of the infiltrating rainwater rises above the side ditch or the water storage tank, a tensile load is generated on the free end portion of the base end portion of the expansion member that is not fixed by the expansion member fixing portion, and an elastic restoring force of the free end portion due to the tensile load is generated, so that the expansion member is pulled back in the direction outside the site. When the water level of the rainwater drops to the level that fills the side ditch or the water storage tank, the center of gravity of the expansion member is located outside the inner side surface position of the side ditch or the water storage tank, so that the expansion member is automatically stored in the side ditch or the water storage tank without power.

[0063] In the 23rd invention, in the 22nd invention, On the floating bag body flap gate, a fulcrum is provided on the ground outside the site of the side ditch or the water storage tank, and it is usually provided so as to cover the side ditch or the water storage tank. When the expansion member stands up, it rises and rainwater permeates through and blocks driftwood, and a protective member for preventing the driftwood from colliding with the expansion member is further provided. Pushed up by the floating of the expansion member accompanying the intrusion of rainwater, the protective member stands up to form a protective wall, and As the expansion member descends with the drop in the water level, the protective member falls down by its own weight, so that the expansion member and the protective member automatically return to the original state before rainwater intrusion without power.

Effect of the Invention

[0064] As described above, according to the present invention, a bag-type flap gate that is extremely simple, low-cost, and highly reliable can be obtained with respect to the conventional floating bag body flap gate.

Brief Explanation of the Drawings

[0065]

Figure 1A

Figure 1B

Figure 1C

Figure 1D

Figure 2A

Figure 2B

Figure 2C

Figure 3A

Figure 3B

Figure 3C

Figure 4A

Figure 4B

Figure 4C

Figure 5

Figure 6A

Figure 6B

Figure 7A

Figure 7B

Figure 8A

Figure 8B

Figure 9A

Figure 9B

Figure 9C

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16A

Figure 16B

Figure 17A

Figure 17B

Figure 18A

Figure 18B

Figure 19

Figure 20A

Figure 20B

Figure 20C

Figure 20D

Mode for Carrying Out the Invention

[0066] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0067] (Embodiment 1) -Configuration of the floating bag flap gate- FIG. 1A, FIG. 1B, FIG. 1C and FIG. 1D show a floating bag flap gate 1 according to an embodiment of the present invention. The floating bag flap gate 1 includes a side ditch 2 or a water storage tank installed around a site to prevent flooding, an expansion member fixing portion 3 continuously installed on the inside S1 of the site of the side ditch 2 or the water storage tank, and an airtight expansion portion 12 filled with gas A inside and a long bag-shaped expansion member 10 having a base end portion 11 continuously and watertightly fixed to the expansion member fixing portion 3.

[0068] The size of the side ditch 2 or the water storage tank installed around the site is appropriately set according to the size of the facility and the flood risk of the land, such as 1 m wide × 1 m deep or 2 m wide × 2 m deep. The side ditch 2 or the water storage tank is usually formed of a concrete wall.

[0069] In the case of a low area where there is a flood risk throughout the site, the side ditch 2 or the water storage tank is installed so as to surround the entire site. However, when a part of the site is high and the flood risk is low, etc., it is not necessary to surround the entire site, and it may be installed within the necessary range around the site. In FIG. 1A etc., a building B protected from flooding is illustrated.

[0070] As shown enlarged in FIG. 5, the expansion member fixing portion 3 is configured to sandwich the expansion member 10 with a metal plate and tighten it with bolts or the like, for example. One side metal plate 3c is embedded in the side wall concrete with the anchor bolt 3a protruding. A separate metal plate 3d has a plurality of through holes at the same pitch as the anchor bolt 3a and is a metal plate about 1 m long. The metal plate 3c embedded in the side wall concrete and the separate metal plate 3d are formed with uneven surfaces that can be engaged to sandwich the expansion member 10 and tightened with bolts and / or nuts 3b, so that the expansion member 10 can be firmly fixed and sealed.

[0071] The expansion member fixing portion 3 is continuously installed on the inside S1 of the site of the side ditch 2 or the water storage tank. Usually, it is installed on the upper part of the side wall of the side ditch 2, but it may be installed on the ground near the side wall.

[0072] In FIG. 1A, the expansion member fixing portion 3 is provided at the upper part of the inner side S1 surface of the side groove 2 or the water storage tank site. As a result, the expansion member 10 can be efficiently erected and laid down well with its short base end portion 11 by rotating approximately with the expansion member fixing portion 3 as a fulcrum.

[0073] On the other hand, as shown in FIG. 8A, the expansion member 10, which is in a bag shape in advance, has a hollow expansion portion 12 and a solid base end portion 11, and the base end portion 11 is fixed to the expansion member fixing portion 3 and tightened.

[0074] In any case, through holes (not shown) are opened in the base end portion 11 at the same pitch as the anchor bolts 3a of the expansion member fixing portion 3, the through holes of the expansion member 10 are passed through the anchor bolts 3a, and a separate metal plate 3d is fitted and tightened with nuts 3b. The separate metal plates 3d are installed continuously with almost no gap.

[0075] The expansion member 10 is usually manufactured with a length of 100 to 200 m. However, when the length around the site S to be surrounded exceeds this, an endless joint may be made by a vulcanization joint or a fitting joint that is usually performed.

[0076] When the side groove 2 or the water storage tank is installed so as to cover the entire site S, it becomes an endless bag body joined to the expansion member 10 without an end face. However, as described above, when a part of the land in the site S is high, etc., and the side groove 2 or the water storage tank does not cover the entire circumference, the expansion member fixing portion 3 should also be installed on the abutting wall of the side groove 2 or the water storage tank, and the end face of the bag body should be fixed in an airtight state in the same way.

[0077] At what height of the abutting wall the expansion member fixing portion 3 is provided can be selected according to the installation constraints.

[0078] The expansion member 10 is usually a long bag body made of rubber, and there are two types: a flat sheet-like one before being attached to the expansion member fixing portion 3 and a pre-bag-shaped one.

[0079] The rubber material is a material that combines flexibility, airtightness, watertightness, and strength, and is optimal as the material for the expansion member 10. As the rubber material, ethylene-propylene rubber is most preferred in terms of the balance of weather resistance, heat resistance, abrasion resistance, flexibility, strength, fatigue resistance, airtightness, watertightness, price, etc., but other synthetic rubbers, natural rubbers, etc. can also be used.

[0080] In the case of a flat sheet shape, both ends of the sheet are folded back and overlapped, and the overlapped portion at both ends (base end portion 11) is sandwiched between the expansion member fixing portions 3 and tightened to form a long bag shape. The portion sandwiched between the expansion member fixing portions 3 is the base end portion 11, and the other bag-shaped portion filled with the gas A is the expansion portion 12.

[0081] In any case, since the floating bag flap gate 1 using the long bag body can utilize the expansion and contraction of the rubber, there is no sliding with the door stop like the conventional flap gate, and no special sealing structure is required, so it is simple and highly reliable.

[0082] As shown in FIGS. 1B and 1C, when rainwater intrudes into the side groove 2 or the water storage tank and the water level H rises, buoyancy is generated in the lightweight expansion member 10, and the expansion member 10 rotates around the expansion member fixing portion 3 as a fulcrum and stands up, so that it easily floats and a waterproof wall is formed. It is configured to maintain a high weir height by the bag structure of the expansion member 10 and the mooring at the expansion member fixing portion 3. Although not shown in detail, on the upper end side of the outer side S2 of the side groove 2, a guiding groove or a guiding hole communicating with the side groove 2 may be provided so that rainwater W can easily flow into the bottom side of the side groove 2.

[0083] Also, as shown in FIG. 1C, in a state where the water level H of the intruding rainwater W fills the side groove 2 or the water storage tank, the center of gravity O of the expansion member 10 filled with the gas A is located above the side groove 2.

[0084] Furthermore, as shown in FIG. 1D, when the water level H of the infiltrating rainwater W rises beyond the side ditch 2 or the water storage tank, a tensile load is generated on the free base end portion 11a of the base end portion 11 of the expansion member 10 that is not fixed by the expansion member fixing portion 3. At this time, the center of gravity O of the expansion member 10 may be located inside (on the side of the building B) rather than the inner side surface position of the site S of the side ditch 2 or the water storage tank. When the elastic restoring force of the free base end portion 11a due to the tensile load is generated, when the water level H of the rainwater W drops to the level that fills the side ditch 2 or the water storage tank, the expansion member 10 is pulled back in the direction of the outside of the site S2, and the center of gravity O of the expansion member 10 is located outside the inner side surface position of the site S1 of the side ditch 2 or the water storage tank, so that the expansion member 10 is configured to be automatically stored in the side ditch 2 or the water storage tank without power.

[0085] - Method of Using the Floating Bag Body Flap Gate - Hereinafter, with reference to FIGS. 1A, 1B, 1C, and 1D, the change in state will be described.

[0086] First, in the installed state, as shown in FIG. 1A, the expansion member 10 is stored inside the side ditch 2. In the present embodiment, the curved upper surface of the expansion portion 12 may be exposed above the side ditch 2.

[0087] When rainwater W gradually infiltrates into the side ditch 2, as shown in FIG. 1B, buoyancy is generated on the expansion member 10 and it begins to float, and the expansion member 10 rotates around the expansion member fixing portion 3 as a fulcrum and stands up. As described above, the rainwater W may flow below the expansion portion 12 through a guiding groove or a guiding hole (not shown).

[0088] The inflow of rainwater W into the side ditch 2 increases when the amount of rainwater W increases and the drainage capacity is insufficient. In the case of the side ditch 2 with a drainage channel, it is advisable to adjust the drainage volume so that the water level H naturally drops as the rainwater W decreases. On the other hand, in the case of the side ditch 2 without a drainage channel, it is advisable to provide a drain plug or the like in advance to drain the rainwater W from the side ditch 2 when the rainwater W decreases.

[0089] In addition, if the side groove 2 is utilized as a water storage tank, rainwater W during heavy rain can be temporarily stored, which also helps prevent internal water flooding caused by increased water volume in rainwater pipes and water channels, making it more effective.

[0090] When the water level H of the invading rainwater W fills the side groove 2 or the water storage tank, as shown in Fig. 1C, the center of gravity O of the expansion member 10 filled with gas A is located outside (above the side groove 2) by a distance (X1) from the inner side S1 surface position of the site of the side groove 2 or the water storage tank.

[0091] Furthermore, when the water level H rises further and reaches near the maximum water level, as shown in Fig. 1D, the expansion member 10 stands up completely to form a waterproof wall, and a very large total water pressure is generated on the side surface of the expansion member 10. At this time, due to the water pressure, the center of gravity O of the expansion member 10 filled with gas A may be located inside by a distance (X2) from the inner side S1 surface position of the site of the side groove 2 or the water storage tank. However, it is desirable that the distance (X2) is not too large.

[0092] To prevent the expansion member 10 from rolling in the direction of the inner side S1 of the site due to the large water pressure on the side wall of the expansion member 10, a large tensile load is generated at the free end portion 11a of the expansion member 10. Here, since an elastic material is used for the expansion member 10, the tensile load generated by the water pressure becomes an elastic restoring force that pulls the expansion member 10 back in the direction of the outer side S2 of the site.

[0093] Next, as the water level H drops from the maximum water level H, the total water pressure of the rainwater W decreases, and the expansion member 10 is pulled back in the direction of the outer side S2 of the site by the elastic restoring force of the free end portion 11a.

[0094] Furthermore, when the water level H drops further and the water level H fills the side groove 2 or the water storage tank, as shown in Fig. 1C, the center of gravity O of the expansion member 10 is configured to be located at a distance (X1) outside the inner side S1 surface position of the site of the side groove 2 or the water storage tank.

[0095] Thereby, the expansion member 10 is automatically stored in the side groove 2 or the water storage tank without power and returns to the installation state shown in Fig. 1A.

[0096] Although not shown in detail, when using the side ditch 2 as a water storage tank, it is advisable to install a normal piping route for discharging rainwater W from inside the facility to a rainwater pipe or a water supply channel and a piping route for storing it in the water storage tank, and to make it possible to change the route according to the situation. In addition, a drain plug for discharging the rainwater W stored in the water storage tank to a rainwater pipe or a water supply channel may be provided.

[0097] It is desirable to pre-fill the bag body of the expansion member 10 with a gas A such as air. If the gas A is filled after the risk of flooding occurs, it takes time to send air in with a pump (not shown), so it is impossible to cope with heavy rain suddenly.

[0098] Therefore, it is desirable to fill with air as much as possible usually, and when a flooding risk occurs, additional filling (fillable in a short time) is performed by a pump, a compressor, etc. not shown as necessary. A mechanism for maintaining the pressure of the gas A at a necessary level may be installed.

[0099] -Function and effect- As described above, in this embodiment, when actual external water flooding or internal water flooding occurs and rainwater W accumulates in the side ditch 2 or the water storage tank, the expansion member 10 gradually stands up due to the buoyancy of the water. Unlike the conventional highly rigid metal door body, the expansion member 10 is very light and has no sliding resistance with the hinge part or the door stop, so it can be easily stood up without a biasing mechanism.

[0100] Furthermore, when the water level H rises and reaches near the maximum water level H, the expansion member 10 is about to roll under a large pressure from the inside S1 of the site due to the water pressure of the rainwater W, but the tension load of the base end portion 11 of the expansion member 10 receives the pressure and a stable water level H can be maintained. Therefore, a stopper member or a mooring member like a conventional flap gate is not required either.

[0101] On the other hand, when the water level H drops, along with the decrease in the pressure received by the expansion member 10, the expansion member 10 returns to the side of the side ditch 2 in the direction from the inside S1 of the site to the outside S2 of the site by the elastic restoring force of the free base end portion 11a of the expansion member 10 which is an elastic material.

[0102] In this embodiment, since the center of gravity O of the expansion member 10 is on the side of the side groove 2 when the water level H is near the full water level of the side groove 2 or the water storage tank, as the water level H further decreases, the expansion member 10 is stored in its original position by its own weight, and a waterproof wall is automatically formed without power during flooding without the intervention of a person, and it returns to its original state automatically without power when the flooding subsides.

[0103] Thus, the floating bag flap gate 1 according to the present invention does not have a rigid door body like a conventional floating flap gate, and since the lightweight expansion member 10 filled with the gas A forms a waterproof wall, it does not have a high-rigidity hinge portion that requires high workability to support a heavy rigid door body, nor does it require an additional seal member that requires high-precision processing and installation to prevent leakage of rainwater W at the rubber hinge portion.

[0104] Also, a biasing mechanism such as a counterweight for lifting a heavy rigid door body is not required.

[0105] Also, a stopper member or a mooring member provided to prevent the heavy rigid door from falling to the opposite side after rising is not required.

[0106] Furthermore, a door stop provided at both left and right ends of the heavy rigid door body and a seal member provided to prevent leakage of rainwater W from the sliding portion between the door body and the door stop are not required.

[0107] As described above, the floating bag flap gate 1 of the present invention does not require all of the rigid door body, high-rigidity hinge portion, additional seal member for the hinge portion, biasing mechanism, mooring member, door stop, and both-side seal members that were required for conventional floating flap gates, and is composed only of the extremely simple and lightweight expansion member 10, so it is low-cost and highly reliable.

[0108] In the present embodiment, in a state where the water level H of the invading rainwater W exceeds the side ditch 2 or the water storage tank, the center of gravity O of the expansion member 10 filled with the gas A is located outside the inner side S1 side surface position of the side ditch 2 or the water storage tank. Therefore, as shown in FIG. 5, the bendable free end portion length Lf is from the end of the expansion member fixing portion 3 (the start of the free end portion 11a) to the upper end (ground position) of the inner side S1 side surface of the side ditch 2 or the water storage tank. It is set to a length equal to or slightly shorter than the minimum winding distance Lmin (for example, 20% or more and 150% or less). When the water is full, the maximum tensile load is generated at the free end portion 11a, and it winds with a high surface pressure along the minimum winding distance Lmin. Therefore, in order to prevent breakage of the free end portion 11a, it is important that there is no sharp portion within the winding range. Therefore, when the free end portion 11a winds around the metal plate 3d of the expansion member fixing portion 3 or the corner portion at the upper end of the side ditch 2, arc or chamfering processing is performed on the corner portion.

[0109] When the total water pressure generated on the side wall of the expansion member 10 decreases with the decrease in the water level H and falls below the full water state of the side ditch 2, the total water pressure in the lateral direction disappears. For this reason, when the free end portion length Lf becomes longer than the minimum winding distance Lmin (for example, exceeds 150%), the elastic recovery force of the base end portion 11 disappears at this point. When this elastic recovery force disappears, the center of gravity O of the expansion member 10 may not be outside the inner side S1 side surface of the side ditch 2, and the expansion member 10 may not be automatically stored. Therefore, it is not preferable to set the free end portion length Lf extremely long with respect to the minimum winding distance Lmin.

[0110] On the other hand, when the free end portion length Lf is extremely shorter than the minimum winding distance Lmin (for example, less than 20%), there is a problem that the expansion member 10 is pulled from the expansion member fixing portion 3 and the standing height of the expansion member 10 becomes low.

[0111] Therefore, it is desired that the free end portion length Lf is not extremely shorter than the minimum winding distance Lmin.

[0112] The length Lf of the free group end is preferably 20% or more and 150% or less, more preferably 70% or more and 100% or less of the shortest winding distance Lmin, so that stable automatic storage can be achieved and a high weir height can be maintained.

[0113] - Modification example 1 of the corner part - By the way, since the conventional floating flap gate uses a rigid door body, a waterproof door cannot be installed at the corner 620 of the facility site. As a configuration for solving this problem in part, as described in Japanese Patent No. 669668, a corner flap gate in which a plurality of door bodies are combined is installed at the corner 620, and a corner door body connected by a hinge structure is folded in the standing direction of the door body when water enters and floats. A floating flap gate has been proposed. However, a hinge or seal structure with a more complex structure is required for the conventional floating flap gate, and a very high processing accuracy is required to ensure long-term reliability as a waterproof device, resulting in a very costly waterproof device.

[0114] In Modification example 1 of the corner part, as shown in FIGS. 2A to 2C, the expansion member 610 housed in the corner 620 of the side groove 2 or the water storage tank has a joint made by a vulcanization joint 616 such that the length of one side in the longitudinal direction becomes longer from the base end portion 611 toward the tip end portion 613 at that corner.

[0115] The vulcanization joint 616 shown in FIG. 2A is a joint method in which a sheet-like unvulcanized rubber or paste rubber is attached between two vulcanized expansion members 610, sandwiched by a small vulcanization press, and bonded using the cross-linking reaction of the unvulcanized rubber while applying heat and pressure to the joint portion. More preferably, the adhesion surface is buffed in advance to roughen it, paste rubber dissolved in a solvent is applied, and then an unvulcanized rubber sheet is attached and heat pressing is performed.

[0116] When ensuring higher adhesive strength, the joint positions of the laminated reinforcing cloth (not shown) are shifted, and a sheet-like unvulcanized rubber is embedded between the respective reinforcing cloths and vulcanized, or an additional reinforcing cloth is embedded to reinforce the joint portion.

[0117] The joined expansion member 610 is, as shown in Fig. 2B, at the corner 620 of the side groove 2 or the water storage tank, and the base end 611 is continuously fixed to the expansion member fixing part 3 across the corner 620.

[0118] With such a configuration, the joint by the vulcanization joint 616 is made so that the length of one side in the longitudinal direction increases from the base end 611 toward the tip end 613, and since the base end 611 is continuously fixed to the expansion member fixing part 3 across the corner 620, the expansion member 610 can undulate without receiving an excessive tensile load during the installation state in the side groove 2 or the water storage tank and the undulation process.

[0119] Also, although the expansion part 612 is compressed during the process of undulating to the fully erected state, as the gas at the corner 620 and the expansion member 610 near the tip move as a whole from the corner 620 toward the central position, as shown in Fig. 2C, even when the expansion member 610 is fully erected and compressed, no bending or significant wrinkle occurs at the corner 620 to cause a decrease in the weir height, and the continuous waterproof wall including the corner 620 stands up and is automatically stored.

[0120] -Deformation example 2 of the corner- In the deformation example 2 of the corner, as shown in Figs. 3A to 3C, the expansion member 610' housed in the corner 620 of the side groove 2 or the water storage tank is joined by being sandwiched between long and narrow plate materials 617 so that the length of one side in the longitudinal direction increases from the base end 611 toward the tip end 613 at that corner.

[0121] The sandwich joint with the long and narrow plate material 617 shown in Fig. 3A sandwiches the joint part of the expansion member 610' butted in the longitudinal direction with two metal plates at once and tightens it with bolts 618, thereby firmly joining the expansion members 610' butted in the longitudinal direction and sealing the expansion part 612 at once.

[0122] Although not shown in detail, a conduction pipe may be embedded between two long and narrow plate materials 617 as necessary, and the expansion part 612 of the expansion member 610' butted in the longitudinal direction may be made conductive.

[0123] At the base end portion 611, since freedom in the vertical and horizontal directions of the expansion member is required, the long and narrow plate material 617 is not used for clamping, and a water stop sheet is attached to prevent rainwater leakage.

[0124] The expansion member 610' joined in this way is, as shown in FIG. 3B, at the corner portion 620 of the side groove 2 or the water storage tank, and the base end portion 611 is continuously fixed to the expansion member fixing portion 3 across the corner portion 620.

[0125] With such a configuration, a clamping joint is made with the long and narrow plate material 617 so that the length of one side in the longitudinal direction increases from the base end portion 611 toward the tip end portion 613, and the base end portion 611 is continuously fixed to the expansion member fixing portion 3 across the corner portion 620. Thus, the expansion member 610' can be raised and lowered without receiving an excessive tensile load during the installation state in the side groove 2 or the water storage tank and the raising and lowering process.

[0126] Further, although the expansion part 612 is compressed during the process of rising and falling to the fully upright state, the gas at the corner portion 620 and the expansion member 610' near the tip end move as a whole from the corner portion 620 toward the central position. Thus, as shown in FIG. 3C, even when the expansion member 610' is fully upright and compressed, bending or a significant wrinkle does not occur at the corner portion 620 to cause a decrease in the weir height, and a continuous waterproof wall including the corner portion 620 stands up and is automatically stored.

[0127] - Numerical Limitation in Modification Examples 1 and 2 of the Corner Portion - When the bending angle on the inner side of the site of the side groove 2 or the water storage tank at the corner portion 620 is α, the joint angle β on the base end side of the vulcanization joint 616 or the clamping joint with the long and narrow plate material 617 at the corner portion 620 of the expansion members 610, 610' is set within the range of the following mathematical formula.

[0128] (360-α) / 2 - 22.5 ≤ β ≤ (360-α) / 2 + 22.5…(1) When the joint angle β is less than (360-α) / 2 - 22.5, the tensile load generated in the longitudinal direction during the erection of the stored expansion members 610, 610' increases, and there is a concern about damage due to the elongation of the expansion members 610, 610'.

[0129] Also, when the joint angle β exceeds (360-α) / 2 + 22.5, no tensile load is generated during erection, but the compression amount near the tip of the expansion members 610, 610' at the maximum erection becomes too large, and there is a concern that wrinkles will occur near the tip and a stable weir height cannot be maintained.

[0130] On the other hand, if the range of the joint angle is within the range of formula (1), the above problems will not occur, and the expansion and collapse can be performed without trouble, and the weir height can be maintained during erection.

[0131] For example, when the bending angle α on the inner side of the site of the side groove 2 or the water storage tank at the corner 620 is 90°, the appropriate joint angle is 112.5 ≤ β ≤ 157.5.

[0132] - Modification example 3 of the corner - In this modification example, as shown in Fig. 4A, the expansion member 610'' butted in the longitudinal direction at the corner 620 is cut at approximately 90°, and is joined by being sandwiched between the end faces butted in the longitudinal direction of the flexible rubber sheet 619'' for corner protection.

[0133] The expansion member 610’’ that abuts in the longitudinal direction of the corner is cut at γ = approximately 90° and joined to the flexible rubber sheet 619’’ by the joint plate material 617’’. However, since the base end portion 611 is positionally restricted by the expansion member fixing portion 3, when the expansion portion 612 expands by filling it with gas, the tip of the joint plate material tilts slightly toward the expansion member side. Therefore, it is more preferable to set the cut angle γ to be slightly larger than 90° (for example, γ = 110°) so that the joint plate material 617’’ stands up vertically at the maximum standing position. Also, the angle ε of the corner portion of the flexible rubber sheet 619’’ is preferably approximately 90°, but it is more preferable to set it to be slightly larger than 90° (for example, ε = 120°) so as not to receive a large tensile load during the rising process. Incidentally, when the cut angle γ of the expansion member 610’’ is, for example, γ = 100° as described above, since there is no problem during the rising process, the angle ε of the flexible rubber sheet 619’’ may be ε = 90°.

[0134] The flexible rubber sheet 619’’ is preferably fan-shaped when flat so that the height becomes uniform when the expansion member 610’’ stands up to the maximum. Also, it is preferable to devise the shape so that the maximum water level does not decrease when the expansion member 610’’ stands up to the maximum.

[0135] When the expansion member 610’’ stands up to the maximum, the lateral load due to the water pressure is borne by the entire expansion member 610’’ that abuts in the longitudinal direction. Therefore, a large load is not applied to the flexible rubber sheet 619’’. However, in order to obtain a stable deformed state, it is preferable to use a rubber sheet with a relatively high bending rigidity. The hardness and thickness of the rubber sheet for imparting rigidity can be set as appropriate.

[0136] The joint plate material 617’’ sandwiches the expansion member 610'' and the flexible rubber sheet 619’’ at the same time and is tightened with bolts 618 or the like. Through holes (not shown) for the bolts 618 are previously formed in the expansion member 610’’ and the flexible rubber sheet 619’’.

[0137] As a result, the airtightness of the expansion part 612 can be maintained, and the expansion member 610'' and the flexible rubber sheet 619'' are firmly connected without separating from each other.

[0138] The joint plate material 617'' covers up to the expansion part 612 and is sandwiched. Since the base end part 611 is tightened by the expansion member fixing part 3 together with the flexible rubber sheet 619'', there is no strength problem. However, since there is a risk of water leakage between the flexible rubber sheet 619'' and the base end part 611, the water stop sheet 621'' is attached across the base end part 611 and the flexible rubber sheet 619'' with a room temperature adhesive or the like as necessary.

[0139] The expansion member 610'' and the flexible rubber sheet 619'' joined in this way are, as shown in Fig. 4B, at the corner part 620 of the side groove 2 or the water storage tank, the base end part 611 is continuously fixed to the expansion member fixing part 3 straddling the corner part 620, and in the installed state, the flexible rubber sheet 619'' at the corner part 620 is in a state of being bent in the compression direction. The water stop sheet 621'' is attached to the corner of the base end part 611 as necessary.

[0140] With such a configuration, the flexible rubber sheet 619'' can undulate without receiving an excessive tensile load during the undulation process.

[0141] Also, the end face of the expansion member 610'' butted in the longitudinal direction and the flexible rubber sheet for corner protection are sandwiched and joined by a plate material, and since the flexible rubber sheet 619'' at the appropriate angle (for example, 110°) is connected to the end face of the expansion member 610'' butted in the longitudinal direction straddling the corner part 620, the expansion member 610'' and the flexible rubber sheet 619'' do not receive an excessive tensile load during the installation state and the undulation process to the side groove 2 or the water storage tank.

[0142] Furthermore, as the flexible rubber sheet 619’’ deforms according to the undulation angle during the process of undulating to the fully upright state, as shown in Fig. 4C, when the two joint plates 617’’ arranged longitudinally in the fully upright state stand up side by side, the expansion member 610’’ and the flexible rubber sheet 619’’ at the corner 620 do not experience a decrease in the weir height due to bending or large wrinkles, and a continuous waterproof wall including the corner 620 is erected and automatically stored.

[0143] Also, by making the corner 620 a separate flexible rubber sheet 619’’, only the flexible rubber sheet 619’’ needs to be replaced at the corner of the expansion member 610’’ that is particularly vulnerable to large distortion and damage, so repair during deterioration over time is also easy, leading to a reduction in maintenance costs.

[0144] Note that the flexible rubber sheet 619’’ may be flat or may be a sheet pre-processed into a bellows shape. When using a rubber sheet processed into a bellows shape, it is more preferable to set the angle ε of the flexible rubber sheet 619’’ to be slightly smaller than 90 degrees (for example, ε = 60°). Since elongation due to the bellows structure can be expected, even if the angle ε of the rubber sheet is slightly smaller than 90°, the bellows will not open and receive a large tensile load during undulation, and the bellows in the portion sandwiched between the two joint plates 617’’ arranged longitudinally in the fully upright state will close to effectively form a waterproof wall.

[0145] With the above configuration, at the corner, it stands up while rotating simultaneously with the straight part to continuously form a waterproof wall, and a waterproof wall can be continuously installed with an extremely simple structure, becoming a waterproof device that is automatically stored in the side groove or water storage tank, and can inexpensively protect the site from rainwater.

[0146] - Modification Example 1 of the Inner Side Surface of the Site of the Side Groove - In this modification example, as shown in Figs. 6A and 6B, an inclined portion S3 is provided by chamfering the inner side of the site of the side groove.

[0147] Then, as shown in Fig. 6B, in the fully upright state of the expansion member 10 when rainwater has risen to the maximum water level, the free base end length Lf is set at a position where the bottom of the expansion member 10 rests on the inclined portion S3.

[0148] As a result, when the water level drops, the expansion member 10 rolls down the inclined portion S3 by its own weight, so that when the rainwater level drops to the level that fills the side ditch 2 or the water storage tank, the center of gravity of the expansion member 10 is located outside the inner side surface position of the site of the side ditch 2 or the water storage tank, and the expansion member 10 is configured to be automatically stored in the side ditch 2 or the water storage tank without power.

[0149] In this modified example, in addition to the elastic restoring force of the free base end portion, the own weight of the expansion member due to the inclined portion can also be utilized, so that the expansion member can be more easily and automatically stored without power.

[0150] - Modification Example 2 of the Inner Side Surface of the Site of the Side Ditch - In this modified example, as shown in Figs. 7A and 7B, an expansion member fixing portion 3' may be provided at the upper end portion of the side ditch 2, and an inclined portion S3 may be provided on the upper surface of the expansion member fixing portion 3'.

[0151] As shown in Fig. 7B, in the fully upright state of the expansion member 10 when rainwater has risen to the maximum water level, the free base end length Lf is set at a position where the bottom of the expansion member 10 rests on the inclined portion S3. As a result, the same operational effects as those of Modification Example 1 of the inner side surface of the site of the side ditch can be obtained.

[0152] - Configuration of the Expansion Member - In the expansion member 10 of Embodiment 1, as shown in Fig. 8A, the expansion portion 12 has a hollow structure, and the integrally formed base end portion 11 has a solid structure. Then, as shown in Fig. 8B, with the expansion portion 12 filled with gas A, the base end portion 11 protrudes from the expansion portion 12.

[0153] This eliminates the risk of gas A leakage due to insufficient tightening at the expansion member fixing portion 3 and facilitates installation.

[0154] - Modification Example 1 of the Expansion Member - Figures 9A to 9C and 10 show Modification 1 of the expansion member according to Embodiment 1 of the present invention, and are different from Embodiment 1 in that the expansion member 110 has a tip portion 113. In each of the following modifications and embodiments, the same parts as those in FIGS. 1A to 8B are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

[0155] As shown in FIG. 9A, the expansion member 110 has a hollow structure for the expansion portion 12, a solid structure for the integrally formed base end portion 11, and a solid structure tip portion 113 integrally formed therewith.

[0156] In this case, as shown in FIG. 9B, with the expansion portion 12 filled with gas A, the base end portion 11 protrudes from the expansion portion 12, and the tip portion 113 protrudes from the expansion portion 12.

[0157] As a result, as shown in FIG. 9C, in a state where the maximum water level H is reached, the tip portion 113 comes to a position higher than the expansion portion 12, thereby increasing the maximum weir height, and by increasing the rigidity of the tip portion 113, it is possible to prevent a partial decrease in the weir height due to wrinkles or bending of the expansion portion 12.

[0158] Also, as shown in the enlarged view of FIG. 10, in Modification 1, the expansion portion 12, the base end portion 11, and the tip portion 113 of the expansion member 110 are made of a rubber material integrally formed without joints.

[0159] By simultaneously vulcanizing (usually press vulcanizing) the expansion portion 12, the base end portion 11, and the tip portion 113, they can be integrally formed without joints. By integrally forming without joints using a rubber material, the base end portion 11 and the tip portion 113 are configured to protrude from the expansion portion 12, and damage to the expansion member 110 can be prevented without generating excessive shear force at the root position of the base end portion 11.

[0160] - Modification 2 of the expansion member - As Modification 2 of the expansion member, as shown in FIG. 11, a reinforcing cloth 114 may be embedded over the entire inner circumference of the expansion portion 12.

[0161] When the height of the weir is low and the pressure of the gas A filled inside the expansion part 12 is small, it can be made of a single rubber material as shown in Fig. 10. However, when a higher weir height is required, by embedding the reinforcing cloth 114 along the entire circumference of the inner part of the expansion part 12 as shown in Fig. 11, it can withstand a higher air pressure. The reinforcing cloth 114 may be a knitted cloth or a bamboo blind, but a woven cloth is preferred.

[0162] Also, as the material of the reinforcing cloth 114, polyamide fiber having both strength and elongation is most preferred, but synthetic fibers such as polyester and natural fibers such as cotton can also be used.

[0163] The cloth structure and number of layers of the reinforcing cloth 114 are appropriately selected according to the weir height and water pressure. In the case of a single layer, a seamless bag woven cloth is preferred.

[0164] - Deformation Example 3 of the Expansion Member - On the other hand, in deformation example 3 of the expansion member, the expansion member 110 has two layers of reinforcing cloth 114. Three or more layers of the reinforcing cloth 114 may be provided.

[0165] As shown in Fig. 12, in the case of two layers, by shifting the butting position J1 of the first layer and the butting position J2 of the second layer, the required strength can be maintained.

[0166] - Deformation Example 4 of the Expansion Member - As shown in Fig. 13, the reinforcing cloth 114 may be continuously embedded from the base end portion 11 side to the base end portion 11 in the expansion part 12.

[0167] When a higher weir height is required, since the total water pressure applied to the expansion member 110 by the invading rainwater W becomes very large, a large tensile load is generated at the base end portion 11 of the expansion member 110. In order to reinforce the base end portion 11 and prevent breakage at the root of the base end portion 11, it is preferable to embed a continuous reinforcing cloth 114 from the expansion part 12 to the base end portion 11.

[0168] Although not shown, a reinforcing cloth 114 may be provided from the tip end portion 113 side to the tip end portion 113 in the inflatable portion 12, or the reinforcing cloth 114 may be provided not only on the base end portion 11 side but also on the tip end portion 113 side in the inflatable portion 12.

[0169] - Modification Example 5 of the Inflatable Member- Also, as shown in FIG. 14, by embedding the reinforcing cloth 114 almost entirely up to the tip end portion 113, the rigidity of the tip end portion 113 can be increased, and it is possible to prevent the tip end portion 113 from falling and overtopping due to the branches and leaves of trees flowing together with the rainwater W. In particular, if the reinforcing cloth 114 is embedded entirely from the base end portion 11 to the inflatable portion 12 and the tip end portion 113, all of the base end portion 11, the inflatable portion 12, and the tip end portion 113 may be reinforced.

[0170] - Modification Example 6 of the Inflatable Member- Furthermore, as shown in FIG. 15, the inflatable member 10 may be provided with a gas insertion port 12a communicating with the airtight inflatable portion 12, and the hose 20 may be connected so that the gas A can be filled with a compressor 21 or the like. Thereby, it can be pressurized when there is a decrease in the pressure of the gas A over time.

[0171] (Embodiment 2) FIGS. 16A and 16B show an inflatable member 210 according to Embodiment 2 of the present invention, which is mainly different from Embodiment 1 in that the configuration of the inflatable portion 212 is different.

[0172] In the present embodiment, the inflatable member 210 is in the form of a single sheet, and the base end portions 11 corresponding to both ends of the sheet are overlapped and simultaneously tightened and fixed by the inflatable member fixing portion 3 to form a hollow inflatable portion 212.

[0173] And a support container 212a for holding the gas A, such as a plurality of foams or a hollow resin frame, is provided inside the inflatable portion 212.

[0174] With this solid support container 212a, the shape of the inflatable portion 212 can be maintained, and a flat surface 212b by the inflatable member 210 can be formed on the upper surface of the side groove 2 or the water storage tank.

[0175] In this embodiment, in the installation state shown in FIG. 16A, a flat surface 212b can be formed on the upper surface of the side groove 2 by the expansion member 210, so that the fall and drop of people and objects into the side groove 2 can be effectively prevented.

[0176] As shown in FIG. 16B, when the expansion part 212 stands up greatly near the maximum water level H, the standing expansion part 212 can block the rainwater W in the same manner as in the first embodiment.

[0177] (Embodiment 3) FIGS. 17A and 17B show Embodiment 3 of the present invention, which is different from the above Embodiment 2 mainly in that a stopper portion 314 for the expansion portion 312 is provided.

[0178] Also in this embodiment, a support container 312a is provided inside the expansion portion 312 as in the second embodiment. As shown in FIG. 17B, when the expansion member 310 stands up greatly near the maximum water level H, a protruding portion 312c is provided at the lower part of the expansion member 310 so that the center of gravity O of the expansion member 310 does not become inside the side groove 2 or the inner side S1 surface position of the site of the water storage tank. On the other hand, a stopper portion 314 that contacts the protruding portion 312c is provided on the outer side S2 surface of the side groove 2 or the site of the water storage tank. As shown in FIG. 17A, a gap is maintained between the protruding portion 312c and the stopper portion 314 so that the rainwater W can flow in.

[0179] In this way, when a flat surface 312b is formed on the upper surface of the expansion member 310, the expansion portion 312 immediately rests on the ground after the expansion member 310 stands up and is not stable like the cylindrical expansion member 10, so that only by adjusting the free base end length Lf, the center of gravity O of the expansion member 310 at the time of standing may not be stable.

[0180] Therefore, when using the expansion member 310 with a flat upper surface, in addition to adjusting the free base end length Lf, the protruding portion 312c may be brought into contact with the stopper portion 314 to stabilize the standing position of the expansion member 310.

[0181] As a result, when the expansion member 310 stands up greatly near the maximum water level H, the center of gravity O of the expansion member 310 is located outside by a distance X1 from the inner side S1 surface position of the side ditch 2 or the storage tank site, so that when the water level H of the rainwater W drops, the expansion member 310 is automatically and surely stored inside the side ditch 2 or the storage tank without power.

[0182] In this embodiment, since the stopping portion 314 is provided, if the expansion member fixing portion 303 is on the upper part of the inner side S1 surface of the side ditch 2 or the storage tank site, it may be vertically attached like the expansion member fixing portion 3 of FIG. 1A, or may be horizontally attached as shown in FIG. 17A of this embodiment.

[0183] (Embodiment 4) FIGS. 18A, 18B and 19 show Embodiment 4 of the present invention, which is different from Embodiment 1 above in that it has a protective member 415.

[0184] In this embodiment, as shown in FIG. 18A, the protective member 415 has a fulcrum 415a on the ground outside the site S2 of the side ditch 2 or the storage tank, and is usually provided so as to cover the side ditch 2 or the storage tank. It is desirable to recess a protective member housing recess 415b for housing the protective member 415 so that the upper surface of the protective member 415 and the ground are substantially flush with each other at the periphery of the side ditch 2.

[0185] As shown in FIG. 18B, it is pushed up by the floating of the expansion member 10 accompanying the intrusion of the rainwater W, and the protective member 15 stands up to form a protective wall. On the other hand, due to the elastic restoring force and self-weight of the expansion member 10 accompanying the drop of the water level H, and the protective member 415 falling down by its own weight, the expansion member 10 and the protective member 415 are configured to automatically return to the original state before the rainwater W intrudes.

[0186] In this way, by providing the protective member 415, it is possible to prevent a large driftwood from directly colliding with the expansion member 10, and usually it serves as a lid for the side ditch 2 or the storage tank, preventing people from falling and enabling walking.

[0187] In addition, since the fulcrum 415a of the protective member 415 is on the ground outside the site S2 of the side ditch 2 or the water storage tank, it does not rise beyond 90°, and no stopper or mooring member like a conventional flap gate is required.

[0188] Moreover, the protective member 415 has a structure that allows water to permeate, and it is not easily subjected to the load in the direction of the inside of the site S due to water pressure. Therefore, the structure of the fulcrum 415a does not require a high-strength and high-precision one like a conventional flap gate, and a simple hinge is sufficient.

[0189] As shown in FIG. 19, with the expansion member 10 rising to the maximum water level H, the position and length of the fulcrum 415a of the protective member 415 are set so that the tip position of the protective member 415 exceeds the outer peripheral tangent position of the expansion part 12.

[0190] Thereby, when the water level H drops and the expansion member 10 is automatically stored in the side ditch 2, the tip of the protective member 415 is not caught by the expansion member 10, and the protective member 415 can be closed without power and automatically.

[0191] The protective member 415 may be composed of a plate-shaped grating made of a lightweight material such as wood or resin. By making the protective member 415 a grating made of a lightweight material such as wood or resin, it is light in weight and floats on water, so it does not become a resistance to the expansion member 10 and can be easily lifted. Also, in the case of wood, it is excellent in landscape as a lid for the side ditch 2 in normal times and also leads to CO2 reduction because it is a biomass material.

[0192] The grating is preferably formed by arranging wood or resin material in a vertical and horizontal grid pattern, but it may also be formed by using wood or resin material only in the width direction and connecting the wood or resin material with a thin metal material in the length direction. In any case, it is preferable that the wood or resin material in the width direction is spanned across both ends of the side ditch 2 and people can walk on the grating.

[0193] As described above, by installing the protective member 415, the risk of damage to the inflatable member 10 caused by driftwood or the like is eliminated, and the highly reliable floating bag flap gate 1 is realized. In addition, during normal times, the protective member 415 serves as a cover for the side ditch 2 or the water storage tank, allowing people to pass safely.

[0194] (Embodiment 5) Figures 20A, 20B, 20C, and 20D show Embodiment 5 of the present invention, which is different from Embodiment 1 in that it has a metal cover 515 as a protective member.

[0195] In this embodiment, a plate-shaped metal cover 515 having a fulcrum on the outside S2 of the site of the side ditch 2 is attached to the vehicle passage portion R that crosses the side ditch 2 or the water storage tank. When the inflatable member 10 stands up, a counterweight 530 and biasing means such as a hydraulic cylinder are provided to assist in lifting the vicinity of the tip of the metal cover 515 on the inside S1 of the site of the side ditch 2 upward. In order to eliminate the step between the metal cover 515 and the road surface, a slope 516 having a smooth inclined surface may be provided.

[0196] In order to prevent flooding around the site, an entrance / exit is required for vehicle passage. For the passage of extra-large vehicles, lightweight gratings made of wood or the like cannot withstand the vehicle weight, so a highly rigid metal cover 515 is required for the passage portion.

[0197] When there is a risk of flooding, the metal cover 515 may be removed in advance, but a heavy machine is required and it takes time and personnel. Therefore, a metal cover that can be opened and closed is provided in the vehicle passage portion R, and biasing means such as a counterweight 530 and a hydraulic cylinder that assist in standing up are provided when the inflatable member 10 stands up, so that it can be easily opened and closed when the inflatable member 10 stands up and falls down.

[0198] Since the fulcrum of the metal cover 515 is on the outside S2 of the site of the side ditch 2 or the water storage tank, it does not rise more than 90°, a stopper is not required, and it automatically closes without power when the water level H drops.

[0199] As a more specific configuration, a hinge is provided at the fulcrum 515a of the metal cover 515, and for example, a suspension ring is provided at the tip 515b of the metal cover 515. A wire rope 532 is hung on the suspension ring and pulled upward. The wire rope 532 may be wound around a pulley 531 provided above the suspension ring, and a weight may be suspended therefrom to serve as a counterweight 530.

[0200] The weight of the counterweight 530 and the pressure of the hydraulic cylinder are such that the metal cover 515 does not lift normally. When rainwater W enters the side groove 2 and buoyancy is generated in the expansion member 10 and it starts to stand up, the weight of the weight and the hydraulic pressure may be appropriately set so that the metal cover 515 can be easily lifted by the upward pushing force from below the metal cover 515 by the expansion member 10.

[0201] In the method of pulling up the tip 515b of the metal cover 515 upward, the force required to open the metal cover 515 is the largest load at the initial stage when the metal cover 515 is in the horizontal position. When the metal cover 515 is opened to a certain extent and an angle is formed, the required force decreases. However, in the method of pulling up in a substantially vertical upward direction with the wire rope 532, as the metal cover 515 forms an angle, the wire rope 532 also changes from vertical to oblique, and the force to open the metal cover 515 decreases even with the same weight. Therefore, the balance between the two is achieved, and the metal cover 515 can be gradually opened with a small force without opening vigorously. When the angles of the wire rope 532 and the metal cover 515 become the same, no more force acts to open it. By appropriately setting the height of the pulley 531, the opening degree of the metal cover 515 can be arbitrarily adjusted. Therefore, as a biasing method, this embodiment is effective.

[0202] The metal cover 515 preferably allows rainwater W such as grating to pass through. Thereby, when the metal cover 515 stands up, large driftwood can be blocked as a protective member, and a collision of large driftwood against the expansion member 10 can be prevented.

[0203] Of course, only the parts where vehicle passage is necessary can be made of metal gratings with a counterweight 530 (which also serves as a metal cover 515 and a protective member), and the other parts can be made of lightweight gratings such as wood as the protective member 415.

[0204] As described above, by using the expansion member 10 and the protective member 415 (metal cover 515) in combination, a simple, inexpensive, safe, and highly reliable floating bag flap gate 1 that covers the entire site is realized. Moreover, by providing a metal cover in the vehicle passage part R, a highly versatile flap gate that allows the passage of heavy machinery and the like is realized.

[0205] 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.

Explanation of Reference Numerals

[0206] 1 Floating bag flap gate 2 Side ditch 3, 3’ Expansion member fixing part 3a Anchor bolt 3b Nut 3c Metal plate on one side 3d Separate metal plate 10, 110, 210, 310, 610, 610’ Expansion member 11, 611 Base end part 11a Free base end part 12, 212, 312, 612 Expansion part 12a Gas insertion port 20 Hose 21 Compressor 113, 613 Tip part 114 Reinforcing cloth 212a Support container 212b Flat surface 303 Expansion member fixing part 312a Support container 312b Flat surface 312c Protrusion 314 Stopping part 415 Protective member 415a fulcrum 415b protective member housing recess 515 metal cover (protective member) 515a fulcrum 515b tip 530 counterweight 531 pulley 532 wire rope 616 vulcanized joint 617, 617’’ joint plate 618 bolt 619’’ flexible rubber sheet 620 corner 621’’ water stop sheet A gas B building O center of gravity R vehicle passage part S1 inside the site S2 outside the site W rainwater

Claims

1. A floating bag flap gate that prevents flooding of a site due to sudden heavy rain, A drain or water tank installed around the site to prevent flooding; An expansion member fixing portion continuously installed on the site side of a gutter or a water tank; The inflatable portion is filled with gas, and the inflatable member has a long bag-like shape and a base end that is continuously and watertightly fixed to the inflatable member fixing portion. When rainwater enters a gutter or a water tank and the water level rises, buoyancy occurs in the expansion member, and the expansion member stands up while rotating, rising to the surface to form a waterproof wall. A high dam height is maintained by the bag structure of the expansion member and the anchoring at the expansion member fixing part. When the water level of the infiltrating rainwater is filled with the gutter or the water tank, the center of gravity of the gas-filled expansion member is located outside the side position of the gutter or the water tank on the site side, When the water level of the invading rainwater rises above the side gutter or the water tank, a tensile load is generated in the free base end of the base end of the expansion member that is not fixed by the expansion member fixing part, and the elastic restoring force of the free base end caused by the tensile load is generated, so that the expansion member is pulled back toward the outside of the site. When the water level of the rainwater drops to a level that fills the side gutter or the water tank, the center of gravity of the expansion member is located outside the side surface position of the side gutter or the water tank on the inside of the site, so that the expansion member is stored in its original position by its own weight, and the expansion member is automatically stored in the side gutter or the water tank without power. A floating bag flap gate characterized by the above.

2. The corner of the gutter or water tank is bent in a direction surrounding at least one part of the site, The expansion member is configured to rotate and rise at the corners simultaneously with the straight portion to continuously form a waterproof wall, and to be automatically stored in the gutter or water tank, At the corner portion, a vulcanization joint or a sandwich joint with a long thin plate material is formed so that the length of one side of the expansion member in the longitudinal direction becomes longer from the base end portion toward the tip end portion, The base end is continuously fixed to the expansion member fixing portion across the corner portion.

2. The floating bag flap gate of claim 1.

3. When the bending angle of the side gutter or water tank at the corner on the inside of the site side is α, The joint angle β at the base end side of the sandwich joint at the corner of the expansion member is (３６０－α)／２－２２．５ ≦ β ≦ (３６０－α)／２＋２２．５ is set within the range 3. The floating bag flap gate of claim 2.

4. The corner of the gutter or water tank is bent in a direction surrounding at least one part of the site, The corners are also configured to rotate and rise simultaneously with the straight sections to form a continuous waterproof wall, and are automatically stored in the gutter or water tank. The end faces of the expansion members that are butted together in the longitudinal direction are joined by sandwiching a flexible rubber sheet for protecting the corners between plates.

2. The floating bag flap gate of claim 1.

5. The length Lf of the bendable free base end is 20% or more and 150% or less of the shortest winding distance Lmin from the end of the expansion member fixing part to the ground on the side of the site of the gutter or water tank.

2. The floating bag flap gate of claim 1.

6. The free base end length Lf is a length that is 70% or more and 100% or less of the minimum winding distance Lmin.

6. The floating bag flap gate of claim 5.

7. A floating bag flap gate for preventing flooding of a site due to sudden heavy rain, A drain or water tank installed around the site to prevent flooding; An expansion member fixing portion continuously installed on the site side of a gutter or a water tank; The inflatable portion is filled with gas, and the inflatable member has a long bag-like shape and a base end that is continuously and watertightly fixed to the inflatable member fixing portion. When rainwater enters a gutter or a water tank and the water level rises, buoyancy occurs in the expansion member, and the expansion member stands up while rotating, rising to the surface to form a waterproof wall. A high dam height is maintained by the bag structure of the expansion member and the anchoring at the expansion member fixing part. When the water level of the infiltrating rainwater is filled with the gutter or the water tank, the center of gravity of the gas-filled expansion member is located outside the side position of the gutter or the water tank on the site side, Furthermore, when the water level of the inflowing rainwater rises above the gutter or water tank, a tensile load is generated at the free base end of the base end of the expansion member that is not fixed by the expansion member fixing part, and the elastic restoring force of the free base end caused by the tensile load is generated, causing the expansion member to be pulled back toward the outside of the site, and when the water level of the rainwater drops to a level that fills the gutter or water tank, the center of gravity of the expansion member is positioned outside the side position of the gutter or water tank on the inside of the site, so that the expansion member is automatically stored in the gutter or water tank without the need for power. The length Lf of the bendable free base end is 20% or more and 150% or less of the shortest winding distance Lmin from the end of the expansion member fixing part to the ground on the side of the site of the gutter or water tank, A slope is provided on the site side of the gutter, and the free base end length Lf is set at a position where the bottom of the expansion member rests on the slope when the water level rises to its maximum and the expansion member is in a completely upright state, When the water level drops, the expansion member rolls down the slope under its own weight, so that when the rainwater level drops to a level that fills the side gutter or water tank, the center of gravity of the expansion member is positioned outside the side surface position on the inside of the site of the side gutter or water tank, and the expansion member is automatically stored in the side gutter or water tank without power. A floating bag flap gate characterized by the above.

8. The expansion portion has a hollow structure, and the base end portion integrally formed with the expansion portion has a solid structure, When the expansion section is filled with gas, the base end portion protrudes from the expansion section.

3. The floating bag flap gate according to claim 1 or 2.

9. The expansion portion has a hollow structure, and the base end portion integrally formed with the expansion portion has a solid structure, Further, the tip portion has a solid structure formed integrally therewith, The tip portion protrudes from the inflatable portion when the inflatable portion is filled with gas, When the maximum water level is reached, the tip is higher than the expanded portion.

3. The floating bag flap gate according to claim 1 or 2.

10. The expansion portion and the base end portion of the expansion member are made of a seamless integrated rubber material.

3. The floating bag flap gate according to claim 1 or 2.

11. The inflatable portion has a reinforcing fabric embedded in it along the entire inner periphery.

11. The floating pouch flap gate of claim 10.

12. A reinforcing fabric is embedded continuously from the expanding portion to the base end portion.

11. The floating pouch flap gate of claim 10.

13. The inflatable member has a gas inlet port that communicates with the inflatable portion, and a hose is connected to the gas inlet port to enable gas to be filled therein.

11. The floating pouch flap gate of claim 10.

14. A floating bag flap gate for preventing flooding of a site due to sudden heavy rain, A drain or water tank installed around the site to prevent flooding; An expansion member fixing portion continuously installed on the site side of a gutter or a water tank; The inflatable portion is filled with gas, and the inflatable member has a long bag-like shape and a base end that is continuously and watertightly fixed to the inflatable member fixing portion. When rainwater enters a gutter or a water tank and the water level rises, buoyancy occurs in the expansion member, and the expansion member stands up while rotating, rising to the surface to form a waterproof wall. A high dam height is maintained by the bag structure of the expansion member and the anchoring at the expansion member fixing part. When the water level of the infiltrating rainwater is filled with the gutter or the water tank, the center of gravity of the gas-filled expansion member is located outside the side position of the gutter or the water tank on the site side, Furthermore, when the water level of the inflowing rainwater rises above the gutter or water tank, a tensile load is generated at the free base end of the base end of the expansion member that is not fixed by the expansion member fixing part, and the elastic restoring force of the free base end caused by the tensile load is generated, causing the expansion member to be pulled back toward the outside of the site, and when the water level of the rainwater drops to a level that fills the gutter or water tank, the center of gravity of the expansion member is positioned outside the side position of the gutter or water tank on the inside of the site, so that the expansion member is automatically stored in the gutter or water tank without the need for power. The expansion member is a sheet-like member, and base ends of the sheet are overlapped with each other and simultaneously fastened and fixed by the expansion member fixing portion to form a hollow expansion portion, By placing a support container for holding gas, such as a plurality of foam bodies or a hollow frame body, in the expansion section, the shape of the expansion section is maintained, and further, a flat surface is formed on the upper surface of the side gutter or water tank by the expansion members. A floating bag flap gate characterized by the above.

15. A protrusion is provided at the bottom of the expansion member so that the center of gravity of the expansion member will not be located inside the side surface position of the side gutter or water tank on the site side when the expansion member rises up significantly due to the water level approaching the maximum water level, and a stopper is provided with which the protrusion can come into contact on the side surface of the side gutter or water tank on the site side.

15. The floating pouch flap gate of claim 14.

16. The expansion member fixing portion is provided on the upper part of the side surface of the drain or water tank on the site side.

3. The floating bag flap gate according to claim 1 or 2.

17. A protective member is provided which has a fulcrum on the ground outside the site of the gutter or water tank and is normally installed to cover the gutter or water tank, and which stands up when the expansion member is erected, allowing rainwater to pass through while blocking driftwood, thereby preventing driftwood from crashing into the expansion member. When rainwater enters the expansion member, the expansion member is pushed up and rises to form a protective wall, The expansion member descends in response to a drop in the water level, causing the protective member to collapse under its own weight, so that the expansion member and the protective member automatically return to their original state before the rainwater entered without the need for power.

3. The floating bag flap gate according to claim 1 or 2.

18. The fulcrum position and length of the protective member are set so that the tip position of the protective member exceeds the outer circumferential tangent of the expansion member when the rainwater reaches the maximum water level and the expansion member is fully erected.

20. The floating pouch flap gate of claim 17.

19. The protective member is a grating made of a lightweight material such as wood or resin.

20. The floating pouch flap gate of claim 17.

20. A floating bag flap gate for preventing flooding of a site due to sudden heavy rain, A drain or water tank installed around the site to prevent flooding; An expansion member fixing portion continuously installed on the site side of a gutter or a water tank; The inflatable portion is filled with gas, and the inflatable member has a long bag-like shape and a base end that is continuously and watertightly fixed to the inflatable member fixing portion. When rainwater enters a gutter or a water tank and the water level rises, buoyancy occurs in the expansion member, and the expansion member stands up while rotating, rising to the surface to form a waterproof wall. A high dam height is maintained by the bag structure of the expansion member and the anchoring at the expansion member fixing part. When the water level of the infiltrating rainwater is filled with the gutter or the water tank, the center of gravity of the gas-filled expansion member is located outside the side position of the gutter or the water tank on the site side, Furthermore, when the water level of the inflowing rainwater rises above the gutter or water tank, a tensile load is generated at the free base end of the base end of the expansion member that is not fixed by the expansion member fixing part, and the elastic restoring force of the free base end caused by the tensile load is generated, causing the expansion member to be pulled back toward the outside of the site, and when the water level of the rainwater drops to a level that fills the gutter or water tank, the center of gravity of the expansion member is positioned outside the side position of the gutter or water tank on the inside of the site, so that the expansion member is automatically stored in the gutter or water tank without the need for power. A metal cover with a fulcrum on the outside of the drain site is attached to the vehicle passageway crossing the drain or water tank. When the expansion member is erected, a biasing means such as a counterweight or a hydraulic cylinder is provided to assist in lifting the tip of the metal cover located on the side of the gutter site upward. A floating bag flap gate characterized by the above.

21. The metal cover is permeable to rainwater, such as a grating, and is configured to block large driftwood as a protective member when erected, preventing the large driftwood from crashing into the expansion member.

21. The floating pouch flap gate of claim 20.

22. A waterproofing method using a floating bag flap gate to prevent flooding of a site due to sudden heavy rain, A drain or water tank installed around the site to prevent flooding; An expansion member fixing portion continuously installed on the site side of a gutter or a water tank; A floating bag flap gate is provided, the floating bag flap gate being configured with a long bag-shaped expanding member having an expanding portion filled with gas and a base end portion continuously and watertightly fixed to the expanding member fixing portion; When rainwater enters the gutter or water tank and the water level rises, buoyancy is generated in the expansion member, and the expansion member stands up while rotating, so that it rises and forms a waterproof wall, When the water level of the infiltrating rainwater fills the gutter or the water tank, the center of gravity of the gas-filled expansion member is located outside the side surface position of the gutter or the water tank on the inside of the site, Furthermore, when the water level of the invading rainwater rises above the drain or water tank, a tensile load is generated in the free base end of the base end of the expansion member that is not fixed by the expansion member fixing part, and an elastic restoring force is generated in the free base end due to the tensile load, which pulls the expansion member back toward the outside of the site. When the rainwater level drops to a level that fills the gutter or water tank, the center of gravity of the expansion member is located outside the side surface position of the gutter or water tank within the site, so that the expansion member is stored in its original position by its own weight, and the expansion member is automatically stored in the gutter or water tank without power. A waterproofing method using a floating bag flap gate.

23. The floating bag flap gate is provided with a fulcrum on the ground outside the site of the gutter or water tank, and is normally provided to cover the gutter or water tank. A protective member is further provided which stands up when the expansion member is raised, allows rainwater to pass through, blocks driftwood, and prevents driftwood from crashing into the expansion member. When rainwater enters the expansion member, the expansion member is pushed up and rises to form a protective wall, When the expansion member descends in response to a drop in the water level, the protective member falls under its own weight, and the expansion member and the protective member automatically return to their original state before the rainwater entered without the need for power.

23. A waterproofing method using the floating bag flap gate of claim 22.

Images