JP7573791B1 - Waterproofing structure - Google Patents

Abstract

The device includes an attachment portion (3) provided along the embankment (10), and an expansion member (2) whose base end (2a) is fixed to one side of the attachment portion and which can be changed in shape from a flat folded state to an expanded state in which it inflates by pumping air into it, and which prevents the outflow of water when the water level rises above the top surface of the embankment when in the expanded state, the expansion member being made of a long expandable member that extends along the embankment and having a base end and an expansion member main body (2b) that is continuous with the base end and which is filled with air and inflates to have a curved surface when in the expanded state, and which has a flat surface in the folded state, and at least in a portion including a bridge portion (B) of a road (R) that intersects with the embankment, the attachment portion does not protrude above the surface of the road, allowing vehicles to run on the attachment portion.

Description

The present invention relates to a waterproof structure equipped with an expansion member made of an expandable material and a waterproof method using the same.

Conventionally, a flood control structure using a flexible long bag body has been known, which comprises multiple pairs of anchoring means that are embedded in a row at a specified interval along the length of a levee constructed to protect against the flooding of rivers and lakes and the intrusion of seawater onto land, in pairs on the top surface of the levee along the length of the levee, flexible long bag bodies that are placed on the top surface of the levee along the length of the levee and expand and stand when a fluid is supplied to them and collapse when the fluid is discharged, and a number of flexible connecting members that can be moored to the anchoring means arranged in a row (see, for example, Patent Document 1).

Also, as in Patent Document 2, an inflatable waterproof fence device is known in which a waterproof fence storage box with an opening/closing lid is installed on the ground in a waterproof area such as the embankment of a river or lake or in a residential area, and a waterproof fence made of a rubber bag that can be expanded and contracted in the vertical direction by injecting and discharging fluid is stored in this storage box, and by supplying fluid to this waterproof fence, the opening/closing lid opens and the waterproof fence is raised and extended.

Japanese Unexamined Patent Publication No. 64-21111 Patent No. 3656769

However, conventional waterproof fences are generally designed to be installed along rivers, and cannot prevent flooding including road sections over bridges, meaning they cannot be used to prevent flooding in rivers with many bridges, such as small rivers in urban areas. Similarly, they cannot be used to waterproof areas of buildings and premises, particularly areas where vehicles and people pass, including entrances, in the event of a risk of river flooding or inundation of sewer systems due to sudden rainfall.

The present invention has been made in consideration of these points, and its purpose is to make it possible to effectively prevent flooding, including in road sections crossed by bridges and around entrances and exits to buildings or sites.

In order to achieve the above objective, the invention provides an expansion member and its mounting part that are arranged without significant steps on the road or passageway leading to the bridge or entrance/exit.

Specifically, the waterproof structure of the first aspect of the invention comprises:
An attachment section provided along the embankment;
an expansion member having a base end fixed to one side of the mounting portion, capable of changing its shape from a flat folded state to an expanded state by inflating it by pumping air into it, and preventing the outflow of water when the water level rises above the upper surface of the embankment in the expanded state;
The expansion member is
a longitudinal inflatable member extending along said bank;
The base end portion,
an expansion member body that is continuous with the base end portion and is filled with air in the expanded state to expand so as to have a curved surface;
In the folded state, the surface is flat and plate-like,
In at least the portion including the road that intersects with the embankment and leads to the bridge portion, the mounting portion is contained in a recess for installing an expansion member formed on the upper surface of the road and does not protrude above the surface of the road, and is configured to allow vehicles and people to pass over the mounting portion and the expansion member contained in the recess for installing the expansion member.

According to the above configuration, the mounting portion accommodated in the recess for installing the expansion member does not protrude from the road surface, so even if it is installed in front of a bridge, it does not interfere with vehicle travel. The expansion member is easy to install because only the base end is fixed to the mounting portion. In addition, since the expansion member is expanded by air, it is easier to expand than liquid, and it is easy to return to its original state because it can be returned to a flat, folded state. Note that the term "embankment" generally refers to a structure made of earth and stone or concrete that is installed along a river bank, lake bank, or coast to prevent flooding of rivers and lakes and intrusion of seawater, but it also includes the wall of a bank that does not have an embankment, such as a small river flowing through an urban area. In addition, "flat plate-like" means not only a completely flat plate-like shape, but also a plate-like shape with unevenness formed on the surface for anti-slip purposes, drainage, etc. In addition, "not protruding from the surface" means that it is not limited to a completely flat state, but does not have any protrusions that would interfere with the passage of cars or people.

The waterproof structure of the second invention comprises:
A mounting portion provided along a building or site having a passageway leading to an entrance and exit for vehicles and people;
an expansion member having a base end fixed to one side of the mounting portion, capable of changing its shape from a flat folded state to an expanded state by supplying air thereinto, and preventing the outflow of water at a raised water level in the expanded state;
The expansion member is
a length of inflatable member along the building or site;
The base end portion,
an expansion member body that is continuous with the base end portion and is filled with air in the expanded state to expand so as to have a curved surface;
In the folded state, the surface is flat and plate-like,
In at least the portion including the passageway leading to the entrance/exit, the mounting portion is accommodated in a recess for installing an expansion member formed on the upper surface of the passageway and does not protrude above the surface of the passageway, and is configured to allow vehicles and people to pass over the mounting portion and the expansion member accommodated in the recess for installing the expansion member.

According to the above configuration, the building and site are waterproofed by expanding the expansion member when there is a risk of inundation of water in the sewer system due to river flooding or sudden rainfall. Under normal circumstances, the mounting part to which the expansion member is attached in the passageway leading to the entrance does not protrude above the surface of the passageway, allowing vehicles and people to pass over the mounting part and the expansion member. The expansion member is easy to install, as only the base end is fixed to the mounting part. In addition, since the expansion member is expanded by air, it is easier to expand than liquid, and it is easy to return to its original state by simply returning it to its flat, folded state.

In a third aspect of the present invention, in the first or second aspect of the present invention,
In at least the portion including the road intersecting the embankment leading to the bridge portion or at least the portion including the passage leading to the entrance/exit, the expansion member at least in the folded state is covered with a cover member, and the cover member covering the expansion member in the folded state does not protrude above the surface of the road or passage, allowing vehicles and people to pass over the cover member.

According to the above configuration, the expansion member is covered with the cover member, so the expansion member is less likely to be damaged and its durability is improved compared to when vehicles pass directly over the expansion member. In addition, the cover member does not protrude from the surface of the road or passageway, so it does not interfere with the travel of vehicles.

In a fourth aspect of the present invention, in the first or second aspect of the present invention,
The expansion member installation recess is formed so that the periphery of the mounting portion is deep and the periphery of the expansion member is shallow.

According to the above configuration, the load applied to the expansion member can be supported by the bottom surface of the recess for installing the expansion member, and the mounting portion can be configured so as not to protrude.

In a fifth aspect, in the fourth aspect,
The mounting portion is covered with a three-dimensional mounting portion cover so as to fill the gap inside the expansion member installation recess, and is configured to allow vehicles and people to pass over the mounting portion cover and the expansion member.

According to the above configuration, the mounting portion is covered by a three-dimensional mounting portion cover that fills the gap inside the recess for installing the expansion member, so that it is reliably protected and unevenness is reduced, making it less likely to get in the way when the vehicle is traveling, etc.

In a sixth aspect of the present invention, in the first or second aspect of the present invention,
A plurality of the expansion members have connecting portions at their longitudinal ends.

According to the above configuration, expansion members of a predetermined length can be connected to each other by the connecting parts, making it possible to install the expansion members over long distances along embankments, buildings or sites.

In a seventh aspect, in the sixth aspect,
The connecting portion is made of multiple metal plates, which sandwich the longitudinal ends of the multiple expansion members, and the connecting portion is covered with a connecting portion cover to reduce unevenness and prevent water from leaking from the connecting portion.

According to the above configuration, by making the connecting part out of a highly rigid metal plate, the expansion member is firmly connected, and by covering the surrounding area with a connecting part cover, not only is unevenness reduced, but water can be prevented from leaking out of the connecting part during expansion.

In an eighth aspect, in the sixth aspect,
A communication pipe extending in the longitudinal direction is provided inside the connecting portion, and communicates between adjacent expansion members in the longitudinal direction.

According to the above configuration, adjacent expansion members in the longitudinal direction are connected to each other, so that multiple expansion members can be expanded simultaneously with one blower and evacuated with one vacuum pump after expansion.

In a ninth aspect, in the sixth aspect,
At the connection portion, the longitudinal ends of the expansion member are connected in a sealed manner.

According to the above configuration, it is also possible to connect adjacent expansion members in the longitudinal direction in a sealed manner without changing the cross-sectional area.

In a tenth aspect, in the sixth aspect,
The connecting portion is composed of a strip-shaped member, and the strip-shaped member is bonded to the adjacent expansion members in a state in which it straddles and covers the longitudinal ends of the expansion members, thereby connecting the expansion members.

According to the above configuration, by connecting adjacent expansion members in the longitudinal direction with a band-shaped member, the cross-sections of the expansion members when expanded at the connecting portion can be maintained almost uniformly, so that water does not flow into the connecting portion.

In an eleventh aspect, in the second aspect,
A plurality of the expansion members are also connected at the corners of the building or site.

According to the above configuration, by expanding the expansion member, water does not flow into the corners of a building or site.

In a twelfth aspect, in the first or second aspect,
An anti-slip structure is provided on a portion of the expansion member that becomes the upper surface in the folded state.

With the above configuration, people, vehicles, etc. can pass through the expansion member safely without slipping.

In a thirteenth aspect, in the twelfth aspect,
The anti-slip structure has an uneven surface.

The above configuration provides a simple anti-slip effect.

In a fourteenth aspect, in the thirteenth aspect,
The uneven surface serves as a drainage groove.

With the above configuration, water does not accumulate on the surface of the expansion member, making driving easier.

In a fifteenth aspect, in the fourteenth aspect,
The drainage groove traverses the entire width of the expansion member.

With the above configuration, water on the surface of the expansion member is easily discharged to the outside of the expansion member.

In a sixteenth aspect, in the fourteenth aspect,
The drainage grooves intersect the lengthwise and widthwise directions of the expansion member.

With the above configuration, water on the surface of the expansion member is more effectively drained outside the expansion member.

In a seventeenth aspect, in the fourteenth aspect,
The drainage groove has a woven structure.

The above configuration provides a higher anti-slip effect.

In an eighteenth aspect, in the third aspect,
The cover member has holes through which water can pass.

With the above configuration, water does not accumulate on the surface of the cover member when folded, and water pressure is easily released when inflated, reducing the load on the inflatable member.

In a nineteenth aspect, in the eighteenth aspect,
The cover member is made of a grating member.

The above configuration results in a cover member that is easy to obtain and has high rigidity.

In a twentieth aspect, in the third aspect,
The cover member has a fulcrum on the water side,
When the expansion member expands, the pressure vessel is pushed by the expanded expansion member and rises upward toward the side opposite to the water.

According to the above configuration, the cover member does not hinder the expansion of the expansion member, and there is no need to open the cover member.

In a twenty-first aspect, in the third aspect,
The cover member is divided into two in the width direction of the expansion member,
The cover member is divided into two parts, each of which has a fulcrum on the water side and the opposite side,
The cover member divided into two parts is normally flat,
The expansion member is configured to open like a double door when expanded.

With the above configuration, the mass of each cover member is kept low, making it easy to handle, and the expansion member automatically pushes it up to open like a double door. Furthermore, the height of the free end of the cover member does not become too high when it expands, so even if someone is left on the bridge side, they can straddle the cover member.

In a twenty-second aspect, in the third aspect,
The cover member is configured to contact a surface of the expansion member and to support a load applied to the cover member by the expansion member.

According to the above configuration, the cover member does not need to support the vehicle's own weight alone, making the cover member lighter, and it is easier to ensure the height of the expansion member when inflated compared to when the cover member must support the water pressure acting on a heavy cover member.

In a twenty-third aspect, in the third aspect,
The cover member is configured to be removable.

According to the above configuration, by removing the cover member before inflation, the expansion member is not pushed by the cover member which is subjected to water pressure when flooded.

In a twenty-fourth aspect, in the third aspect,
The cover member covers the expansion member in the folded state but does not cover the mounting portion,
The cover member and the mounting portion are configured to allow vehicles and people to pass over them.

With the above configuration, the size of the cover member can be reduced, and by making the mounting portion highly rigid with few irregularities, vehicles can pass through easily.

In a twenty-fifth aspect, in the first or second aspect,
The expansion member is reinforced with a woven fabric.

According to the above configuration, the woven fabric reinforcement allows the shape to be maintained when high-pressure air is introduced and allows the material to withstand large water pressure.

In a twenty-sixth aspect, in the first or second aspect,
The rigidity of the sheet member above the air chamber in the inflatable member is greater than the rigidity of the sheet member below the air chamber.

With the above configuration, the rigidity of the upper side is high, which prevents the expansion member from floating up under normal conditions and causing unevenness.

In a twenty-seventh aspect, in the first or second aspect,
The thickness of the sheet member above the air chamber in the inflatable member is greater than the thickness of the sheet member below the air chamber.

According to the above configuration, the upper side that faces the water when expanding is thick, so the expansion member is less likely to break even if it is hit by wood or stones.

In a twenty-eighth aspect, in the first or second aspect,
The inflatable member includes a sheet of ethylene propylene rubber.

The above configuration provides high weather resistance and heat resistance, so it will not deteriorate even if exposed to direct sunlight for a long period of time.

In the twenty-ninth invention,
A groove, protrusion or hollow portion extending in the longitudinal direction is provided on the inner surface of the expansion member, and the groove, protrusion or hollow portion is configured to guide the air in the expansion member to a hole portion that can communicate with the outside of the expansion member when exhausted.

According to the above configuration, when the expansion member returns from the expanded state to a flat state, the air inside the expansion member is easily discharged to the outside of the expansion member through the grooves, protrusions or hollow portions.

A flood prevention method according to the 30th aspect of the present invention comprises:
an expansion member installation process for recessing an expansion member installation recess that is deeper than the surface of the road by a predetermined depth in a section including a road that intersects with the embankment and leads to a bridge section, attaching an attachment part along the embankment to the water side of the expansion member installation recess, and fixing a base end of an expansion member made of a flat, folded, inflatable member having a flat surface to the attachment part;
a cover member installation process in which a cover member step is recessed on the periphery of the expansion member installation recess to a depth approximately equal to the thickness of the plate-shaped cover member below the surface of the road, and the cover member is fixed to the cover member step in an openable and closable manner so that the cover member does not protrude above the surface of the road and covers at least the expansion member;
and a flood prevention process for, when the water level rises, sending air into the inside of the expansion member body of the expansion member, causing it to inflate with its base end fixed to the mounting portion, thereby preventing the outflow of water whose water level has risen above the top surface of the embankment.

According to the above configuration, since it is only necessary to fix at least the base end of the flat-plate-like folded expansion member, the expansion member can be easily attached. In addition, since it is only necessary to pump air into the expansion member to expand it, it takes less time than when liquid is pumped into it, and it is easy to return it from the expanded state to the flat-plate-like folded state. Furthermore, since it is only necessary to fix at least the base end of the expansion member, it is easy to ensure the height of the expansion member, and water leakage can be effectively prevented. In addition, since the expansion member is covered by the cover member, the expansion member is less likely to be damaged and its durability is improved compared to when vehicles, etc. pass directly over the expansion member. Furthermore, since the cover member does not protrude from the surface of the road or passage, it does not interfere with the travel of vehicles, etc. In addition, if the mounting portion is not covered by the cover member, it is sufficient to make the mounting portion have a shape with few projections and recesses so that vehicles and people can pass through it. The cover member may be removed before the expansion member is inflated, or it may be pushed up by the expanding expansion member.

The flood prevention method of the 31st invention comprises:
an expansion member installation process for recessing an expansion member installation recess that is deeper than the surface of the passage by a predetermined depth in a building or site having a passage leading to an entrance through which vehicles and people enter and exit, attaching an attachment part along the water side of the expansion member installation recess along the building or site, and fixing a base end of an expansion member made of a flat, folded, inflatable member having a flat surface to the attachment part;
a cover member installation process in which a cover member step is recessed on the periphery of the expansion member installation recess to a depth approximately equal to the thickness of a plate-shaped cover member that is deeper than the surface of the passage, and the cover member is fixed to the cover member step in an openable and closable manner so that the cover member does not protrude beyond the surface of the passage and covers at least the expansion member;
and a flood prevention process for, when the water level rises, sending air into the inside of the expansion member body of the expansion member, causing it to inflate with its base end fixed to the mounting portion, thereby preventing the outflow of water whose level has risen above the surface of the passage.

According to the above configuration, the building and site are waterproofed by expanding the expansion member when there is a risk of inundation of the sewer system due to river flooding or sudden rainfall. Under normal circumstances, the mounting part to which the expansion member is attached in the passageway leading to the entrance does not protrude from the surface of the passageway, so vehicles and people can pass over the mounting part and the expansion member. In addition, since the expansion member is covered by the cover member, the expansion member is less likely to be damaged and its durability is improved compared to when vehicles, etc. pass directly over the expansion member. Furthermore, since the cover member does not protrude from the surface of the road or passageway, it does not interfere with the travel of vehicles, etc. If the mounting part is not covered by the cover member, it is sufficient to make the mounting part have a shape with fewer projections and recesses so that vehicles and people can pass over it. The cover member may be removed before the expansion member is expanded, or it may be pushed up by the expanding expansion member.

In a thirty-second aspect, in the thirtieth or thirty-first aspect,
In the expansion member installation step, the expansion member installation recess is recessed so that the periphery of the mounting portion is deep and the periphery of the expansion member is shallow,
In the cover member installation step, the cover member is installed so that at least the weight of the cover member on the side opposite to the water is supported by the expansion member.

According to the above configuration, the weight of the cover member can be supported by the expansion member with a simple configuration, and since there is no need for the cover member alone to support the weight of the vehicle, etc., the cover member can be made lighter, and it is easier to ensure the height of the expansion member when expanded compared to when it is necessary to support the water pressure acting on a heavy cover member.

As explained above, according to the present invention, the mounting portion and the expansion member do not protrude above the surface of the embankment or site, making it easier for vehicles and people to pass over them and preventing flooding including in the road section over which the bridge is built and around the passages leading to the site or building entrances.

1 is a plan view showing a waterproof structure according to a first embodiment of the present invention in a folded state. FIG. FIG. 2 is an enlarged cross-sectional view taken along line IIA-IIA in FIG. 1 . FIG. 2B is an enlarged cross-sectional view of part IIB of FIG. 2A. FIG. 2B is an enlarged plan view corresponding to a portion IIB of FIG. 2A. FIG. 2B is a cross-sectional view equivalent to FIG. 2A when inflated. FIG. 2 is an enlarged cross-sectional view taken along line IVA-IVA in FIG. 1. FIG. 4B is an enlarged cross-sectional view equivalent to FIG. 4A in the case of a removable cover member. FIG. 4B is a cross-sectional view equivalent to FIG. 4A when inflated. FIG. 5B is an enlarged cross-sectional view equivalent to FIG. 5A in the case of a removable cover member. FIG. 2 is a diagram showing an outline of a blower system of a waterproof structure. FIG. 11 is a plan view showing a waterproof structure according to a second embodiment of the present invention in a folded state. FIG. 8 is an enlarged cross-sectional view taken along line VIIIA-VIIIA in FIG. 7 . 8A according to a modified example having a different shape of the mounting portion. FIG. FIG. 8B is an enlarged cross-sectional view of a road portion, equivalent to FIG. 8A. FIG. 8C is an enlarged cross-sectional view of the road portion, equivalent to FIG. 8B. FIG. 8B is a cross-sectional view equivalent to FIG. 8A when inflated. 8 is an enlarged cross-sectional view taken along line XX of FIG. 7. FIG. 11 is a cross-sectional view equivalent to FIG. 10 when inflated. 13 is a plan view showing a connection portion cover that covers the connection portion and its surroundings. FIG. 13 is an enlarged cross-sectional view taken along line XIII-XIII of FIG. 12. 14 is an enlarged cross-sectional view taken along line XIV-XIV of FIG. 13. FIG. 11 is a perspective view showing a waterproof structure according to a third embodiment of the present invention in a folded state. 4 is an enlarged perspective view showing the expansion member and its surroundings in a folded state. FIG. 4 is an enlarged cross-sectional view showing the expansion member and its surroundings in a folded state. FIG. 16 is an enlarged cross-sectional view taken along line XVIIA-XVIIA of FIG. 15 . An enlarged cross-sectional view of line XVIIB-XVIIB in Figure 17A. FIG. 11 is a perspective view showing an expanded state of a waterproof structure according to a third embodiment of the present invention. 19 is an enlarged perspective view showing the expansion member in an expanded state and its surroundings at part XIXA in FIG. 18 . 19 is an enlarged cross-sectional view showing the expansion member in an expanded state and its surroundings at part XIXA in FIG. 18 . 13 is an enlarged perspective view showing the expansion member and its surroundings in a folded state when there is no recess for installing the expansion member. FIG. 13 is an enlarged cross-sectional view showing the expansion member and its surroundings in a folded state when there is no recess for installing the expansion member. FIG. 13 is an enlarged cross-sectional view showing an expansion member and its surroundings in a folded state in another case where there is no recess for installing the expansion member. FIG. 13 is an enlarged cross-sectional view showing an expansion member and its surroundings in a folded state in yet another case in which there is no recess for installing the expansion member. FIG. 13 is an enlarged perspective view showing an expansion member and its surroundings in an expanded state when there is no recess for installing the expansion member; FIG. 13 is an enlarged cross-sectional view showing an expansion member and its surroundings in an expanded state when there is no recess for installing the expansion member. FIG. 13 is a plan view showing a connection portion cover that covers the connection portion at the corner portion and its surroundings. FIG. 23 is an enlarged cross-sectional view taken along line XXIII-XXIII of FIG. 22. FIG. 11 is a plan view showing an expanded state of a waterproof structure according to a fourth embodiment of the present invention. An enlarged cross-sectional view of line XXV-XXV in Figure 24. 26 is an enlarged cross-sectional view taken along line XXVI-XXVI of FIG. 24.

Each embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1)
-Waterproof structure-
1 to 6 show a flood control structure 1 according to a first embodiment of the present invention, which includes an attachment portion 3 provided on a river levee 10 so as to extend along the levee 10. The attachment portion 3 may be provided in a straight line, or may be bent or curved in accordance with the river.

The term "levee" generally refers to a structure made of earth, stone, or concrete built along a riverbank, lakeshore, or coast to prevent rivers or lakes from flooding or seawater from entering the area, but it also includes the walls of banks that do not have any raised earth, such as those of small rivers flowing through urban areas.

In this embodiment, at least the embankment 10 is recessed with an expansion member installation recess 12 that is deeper than the upper surface 10a by a predetermined depth. Then, as shown in Figures 2A and 3, a cover member step 13 is recessed from the upper surface 10a of the embankment 10 to the periphery of this expansion member installation recess 12, with a depth equivalent to the thickness of the plate-shaped cover member 5. The cover member step 13 is formed so as to be parallel on the river side and the road R side. As a result, the depth of the expansion member installation recess 12 is slightly deeper than the combined depth of the thickness of the cover member 5 and the thickness of the mounting portion 3, and in this embodiment, the bottom surface 12a is approximately horizontal. The shape of the bottom surface 12a is not limited to this, as will be described later.

2A and 3, the base end 2a of the expansion member 2 is fixed to the mounting part 3 so as to be sandwiched between the bottom surface 12a of the expansion member installation recess 12. The expansion member 2 can be changed in shape from the flat folded state shown in FIG. 1A to an expanded state (see FIG. 3) in which air is pumped into the inside, and in the expanded state, the water W at a level higher than the upper surface 10a of the embankment 10 can be prevented from flowing out. The shape of the mounting part 3 is not limited to this, but the mounting part 3 is fixed by an anchor bolt 4 to the river side of the expansion member installation recess 12 recessed into the upper surface 10a of the embankment 10. The mounting part 3 and the anchor bolt 4 are preferably made of stainless steel, which is resistant to rust. Although not shown, the mounting part 3 may be sandwiched by a receiving member and a pressing member, which have complementary irregularities.

In this embodiment, at least in the portion of the road R that intersects with the embankment 10 leading to the bridge portion B, the mounting portion 3 does not protrude above the surface of the road R, and is configured so that vehicles can travel on the mounting portion 3.

The expansion member 2 is made of a long rubber member that runs along the embankment 10. As shown in FIG. 2B, this rubber member is made of a multi-layered member and has a base end 2a and an expansion member body 2b that expands to have a curved surface. For example, two canvas layers 31 are covered with an inner cover rubber 32 and an outer cover rubber 33. The upper and lower members may have a release agent on the surface of the air chamber where the inner cover rubber 32 comes into contact, so that they can easily separate when expanded.

The length of the base end 2a may be long, and there may be a plate-shaped non-inflatable portion between the mounting portion 3 and the expansion member main body 2b. Although not shown in detail, for example, the base end 2a at a predetermined position is provided with an intake port 2c for taking in air from a blower (shown only in FIG. 6). This configuration is not particularly limited, but this intake port 2c may be, for example, a cylindrical member, and may be in communication with the inside of the expansion member main body 2b (expansion section core body) in a sealed manner.

2B, the thickness t1 of the sheet members (external cover rubber 33, two canvas layers 31, and inner cover rubber 32) above the air chamber in the expansion member 2 may be configured to be greater than the thickness t2 of the sheet members (external cover rubber 33, two canvas layers 31, and inner cover rubber 32) below the air chamber (t1>t2). With this configuration, the thickness t1 of the upper side that faces the water when inflated is thick, so that the expansion member 2 is less likely to break even if it is hit by wood or stones.

The rigidity of the sheet members (external cover rubber 33, two canvas layers 31, and internal cover rubber 32) above the air chamber in the expansion member 2 may be configured to be greater than the rigidity of the sheet members (external cover rubber 33, two canvas layers 31, and internal cover rubber 32) below the air chamber. In this embodiment, the rigidity of the upper sheet members is increased by increasing the thickness of the upper external cover rubber 33, but the rigidity may also be increased by changing the material. The greater rigidity of the upper side prevents the expansion member from floating up under normal conditions by being held down by its own weight, thereby preventing the occurrence of unevenness.

The expansion member 2 may include a sheet of ethylene propylene rubber. This provides high weather resistance and heat resistance, so it will not deteriorate even if exposed to direct sunlight for a long period of time.

The expansion member 2 may also be reinforced with woven fabric. By being reinforced with woven fabric, it can maintain its shape when high-pressure air is introduced and can withstand large water pressure.

2A and 4A, in the folded state, the expansion member 2 is stored in the expansion member installation recess 12 in the form of a plate with a substantially flat surface. In this embodiment, the mounting portion 3 and the entire expansion member 2 in the folded state are covered with a flat cover member 5 in a continuous longitudinal area including the bridge portion B of the road R that intersects with the embankment 10. The cover member 5 that covers the expansion member 2 in the folded state does not protrude above the surface of the road R, allowing vehicles and people to pass over the cover member 5. It is preferable that the cover member 5 is flat, but some unevenness may be acceptable. As in the second embodiment described below, the cover member 5 may be provided only in the portion including the bridge portion B of the road R that intersects with the embankment 10.

As shown in Figure 1, the cover member 5 must have holes through which water can pass. This is to prevent water from pooling on the surface of the cover member 5 when folded, and to make it easier to release the water pressure of water flowing in from the river when inflated.

In this embodiment, the cover member 5 is made of a lattice-shaped grating member. A grating member has a high proportion of holes, allowing water to pass through easily, and is easy to obtain and provides a highly rigid cover member 5.

As shown in Figure 3, the cover member 5 has a fulcrum (hinge portion 5a) on the water side of the mounting portion 3, and is configured to be pushed by the expanded expansion member 2 when the expansion member 2 expands, rising upward toward the land side. The hinge portion 5a is firmly fixed to the cover member step portion 13 by bolts (not shown) or the like.

In this embodiment, the cover member 5 does not hinder the expansion of the expansion member 2, and since it has a grating structure, it is not slippery.

As shown in Fig. 4A, the expansion member 2 may have a hollow pipe 7 with multiple through holes penetrating the inside. This makes it easier to exhaust air from the expansion member 2 through the pipe 7.

This hollow portion does not have to be a pipe material 7, and may be a groove portion (not shown) extending in the longitudinal direction of the expansion member 2. In short, the groove portion, protrusion portion, or hollow portion may be configured so that the air in the expansion member 2 is guided to a hole portion (not shown) that can communicate with the outside of the expansion member 2 when exhausting. The protrusion portion may be, for example, a string-shaped member arranged on the surface in a lattice pattern to form projections and recesses. This makes it easier for the air inside the expansion member 2 to be discharged to the outside of the expansion member through the groove portion, protrusion portion, or hollow portion when returning from the expanded state to the flat state after use.

As shown in Figure 12, a connecting portion 115 is provided to connect multiple expansion members 2 extending along the embankment 10. Since there is a limit to the maximum length of the expansion members 2 when manufacturing and transporting them, it is necessary to line up and connect multiple expansion members 2 in the longitudinal direction.

In this way, the connecting parts 115 can connect the expansion members 2 of a predetermined length to each other, making it possible to install the expansion members 2 over long distances along the embankment 10. The shape of the connecting parts 115 is determined so as to ensure the passage of air through the communication pipes 2d, etc.

12 to 14, for example, the connecting part 115 is made of a pair of metal plate-like members that sandwich the longitudinal ends of the expansion member 2 in the closed state and are fastened with bolts or the like to prevent air from leaking out of the expanded expansion member 2. By making the connecting part 115 out of a highly rigid metal plate in this way, the expansion member 2 is firmly connected.

As shown in Figure 14, the connecting portion 115 is recessed and is covered with a band-shaped connecting portion cover 116 to prevent water from entering through the recessed portion.

As shown in Figures 3 and 5, the expansion member 2 is configured to expand in an expanded state with the base end 2a fixed to the mounting portion 3, thereby preventing the outflow of river water W.

The flood control structure 1 of this embodiment has a blower system 20 as shown in Fig. 6. The blower system 20 is provided, for example, on the upper surface 10a of the embankment 10 and includes a blower 21 driven by an electric motor, a switching valve 22 and a switching lever 23 for switching between supplying and exhausting air from the blower 21, a pressure gauge 24, an electric air supply valve 25, and a control panel 26 for controlling these. In an emergency, a supply hose 27 from the blower 21 is connected to an air intake 2c provided at a predetermined location on the base end 2a of the expansion member 2.

The control panel 26 may monitor the value of the pressure gauge 24 and automatically adjust the blower 21 to maintain a constant pressure.

Although not shown, a vacuum pump may be further provided to forcibly remove the air from within the membrane of the expansion member 2 when the risk of flooding is eliminated. By creating negative pressure with the vacuum pump rather than opening to the atmosphere, the upper and lower sheets of the membrane can be brought into close contact with each other, returning the expansion member 2 to a flat state. At this time, the hollow portion and groove portion described above allow efficient exhaustion.

The control panel 26 may be equipped with a receiver 28 capable of receiving official disaster danger information. In this way, when disaster danger information is issued, the blower 21 can be automatically switched on to inflate the expansion member 2 and create a waterproof wall.

The control panel 26 may monitor the water level of a river or the like using a sensor and/or camera 29, and when a desired water level is reached, the blower 21 may be automatically switched on to inflate the expansion member 2 and create a waterproof wall.

A camera 29 may be provided to photograph the top surface of the expansion member 2, and after confirming that no one is on the expansion member 2, the control panel 26 may switch on the blower 21 to inflate the expansion member 2 and create a waterproof wall.

The control panel 26 may be configured to generate an alarm or the like on a buzzer or speaker 30 provided near the expansion member 2 before switching on the blower 21.

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

First, in the expansion member installation process, as shown in Figures 1, 2A, and 4A, an expansion member installation recess 12 is recessed on the road R side of the fence 11 of the river embankment 10, and is deeper than the upper surface 10a by a predetermined depth. The mounting part 3 is attached along the embankment 10 on the water side of this expansion member installation recess 12, and the base end 2a of the expansion member 2 is fixed by the mounting part 3. Specifically, as shown in Figures 2A and 4A, an expansion member installation recess 12 is recessed at a predetermined distance from the riverside in an embankment 10 made of an existing or new concrete structure, etc., and the expansion member 2 in a folded state is placed in this expansion member installation recess 12, the mounting part 3 is placed on top of the base end 2a, and the anchor bolt 4 is tightened. Although not shown, it is desirable to provide a drainage hole or the like in an appropriate position in the expansion member installation recess 12 so that water does not accumulate.

Next, in the cover member installation process, a cover member step 13 is recessed around the periphery of the expansion member installation recess 12, the depth of which is approximately equal to the thickness of the plate-shaped cover member 5, below the top surface of the embankment 10. The cover member step 13 may be provided together with the expansion member installation recess 12. The hinge portion 5a of the cover member 5 is then fixed to the river side of the cover member step 13, and the cover member 5 covers the expansion member 2 so that it does not protrude above the top surface 10a of the embankment 10. The side of the cover member 5 opposite the hinge portion 5a rests on the cover member step 13 on the road R side. In this state, the cover member 5 has the rigidity to support the weight of a vehicle or the like.

In this way, vehicles and the like pass over the cover member 5 to travel across the bridge section B during normal times as shown in Figure 4A, so the expansion member 2 is less likely to be damaged and its durability is improved compared to when vehicles and the like pass directly over the expansion member 2. In addition, because the cover member 5 does not protrude from the surface of the road R, it does not interfere with the travel of vehicles and the like.

Next, in the flood prevention process, when the water level of the river rises, air is sent into the interior of the expansion member 2 from the intake 2c, as shown in Figure 6. Specifically, after connecting the supply hose 27 from the blower 21 to the air intake 2c of the expansion member 2, the control panel 26 is operated to start the blower 21 and send air into the expansion member main body 2b.

As a result, as shown in Figure 3, the expansion member body 2b of the expansion member 2 expands with the base end 2a fixed to the mounting part 3, pushing up the cover member 5. Since the cover member 5 is made of a grating member with many holes, the cover member 5 is not too heavy, and the cover member 5 is not subjected to excessive water pressure from water flowing in from the river.

If the water level rises further, the expansion member body 2b in the expanded state prevents the outflow of water W whose level has risen above the upper surface 10a of the embankment 10. In this state, the expansion member 2 expands with the base end 2a firmly fixed, so a fence solely to support the expansion member 2 is not necessary, and the strength can be increased, making it easier to ensure height.

In this way, the expansion member 2 of this embodiment can be expanded by pumping air into the expansion member 2, which takes less time than pumping liquid into it, and even when it is folded again, hollow parts and grooves such as pipe material 7 are provided inside the expansion member 2, so it is easy to return it from the expanded state to a flat state.

In addition, the mounting portion 3 is hidden under the cover member 5 and is installed so as not to protrude above the surface of the road R, so that even if it is installed in front of a bridge, it does not interfere with vehicle travel.

Therefore, the flood control structure 1 of this embodiment can effectively prevent flooding, including the road portion crossed by bridge section B.

--Modifications--
4B and 5B show a case where the cover member 5 is not attached so as to be openable and closable by the hinge portion 5a but is removable.

In this modified example, when flooding occurs, it is necessary to lift and remove the cover member 5 before inflating the expansion member 2, but removing it has the advantage that the expansion member will not be pushed by the cover member, which receives water pressure when flooded. In addition, there is no need to make the cover member into a water-permeable shape such as a grating, and it can be made into a simple plate-like member without holes.

For example, one idea is to use the cover material as a waterproof wall, but this would result in a heavy, thick waterproof wall due to the large water pressure that would be applied to it, and even if air was pumped into the expansion member, the dam height would be low. In order to raise the dam height, very high air pressure would be required, which would put excessive force on the expansion member, making it prone to damage. To prevent damage, the expansion member would need to be made strong and thick, which has the disadvantage of being very heavy and costly.

Moreover, constructing a waterproof wall over a long distance along a river would require covering materials over a long distance, which is not realistic. Creating a waterproof wall using multiple covering materials also has the disadvantage that it is difficult to seal between the covering materials, which allows water to leak through the gaps in the waterproof wall, making it impossible to provide complete waterproofing.

In this modified example, the cover member 5 is removable and the expansion member 2 alone forms a waterproof wall, so the above-mentioned drawbacks do not occur. In any of the embodiments, the cover member may be removable rather than supported so as to be openable and closable by a hinge portion.

(Embodiment 2)
7 to 11 show a waterproof structure 101 according to a second embodiment of the present invention, which differs from the first embodiment in particular in the configurations of cover members 105 and 106. In the following embodiment, the same parts as those shown in Figures 1 to 6 are designated by the same reference numerals and detailed descriptions thereof will be omitted.

In this embodiment, the recess 112 for installing the expansion member is recessed so that its depth gradually becomes shallower from the water side (river side) toward the opposite side, as shown in Figures 8A, 8C, and 9 to 11.

In this embodiment, the cover members 105, 106 are provided only on the road R portion leading to the bridge portion B, and the cover members 105, 106 are not provided in other portions. The cover members 105, 106 are not necessarily required in other portions, especially in areas where vehicles do not pass frequently.

As shown in Figures 10 and 11, a cover member step 113 is recessed on the river side of the expansion member installation recess 112 where the cover members 105, 106 are provided. A cover member step 113 is also recessed on the side opposite the shallow river, but the expansion member installation recess 112 may also serve as the cover member step 113. The cover members 105, 106 are divided into two in the width direction of the expansion member 2. The two divided cover members 105, 106 each have a fulcrum (hinge portions 105a, 106a) on the water side and the land side, and the hinge portions 105a, 106a are fixed by the cover member step 113.

As shown in Figure 10, the two divided cover members 105, 106 are flat under normal conditions, and as shown in Figure 11, they are configured to open like a double door when the expansion member 2 is expanded.

As shown in Figure 10, the cross section of the recess 112 for installing the expansion member is formed so as to gradually become shallower as it moves away from the river, and the undersides of the cover members 105, 106 are configured to contact the surface of the expansion member 2 and the load applied to the cover members 105, 106 is supported by the expansion member 2.

In this embodiment, as shown in Fig. 8A, in the areas where there are no cover members 105, 106, the mounting portion 3 is sealed with a three-dimensional rubber sheet cover 114 as a mounting portion cover, filling any gaps. In this way, the mounting portion 3 is completely covered with the three-dimensional rubber sheet cover 114, so it is reliably protected and is less likely to get in the way when the vehicle is traveling. The mounting portion cover does not have to be made of rubber, but may be made of resin, etc.

In addition, even on the road leading to bridge section B as shown in Figure 8C, it is possible to allow vehicles and pedestrians to pass through without providing a cover member as shown in Figure 8A.

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

First, as shown in Figure 9, in the expansion member installation process, the expansion member installation recess 112 is recessed so that its depth gradually decreases from the water side to the opposite side. As described above, at least the expansion member installation recess 112 should be formed so that it is deep around the mounting portion 3 and shallow around the expansion member 2.

As shown in Figure 11, in the cover member installation process, cover member step portions 113 are recessed on the river side and land side of the expansion member installation recess 112. Cover members 105, 106 are installed so that the weight of the side of cover member 105 facing away from the water and the weight of cover member 106 facing the river are supported from below by expansion member 2.

The hinge portion 105a of the cover member 105 on the river side is fixed to the cover member step portion 113 on the river side, and the hinge portion 106a of the cover member 106 on the road R side is fixed to the cover member step portion 113 on the road R side.

In areas not covered by the cover members 105, 106, the unevenness of the mounting portion 3 would be exposed if left as is, but as shown in Figure 8A, the mounting portion 3 is covered with a rubber sheet cover 114 that matches these unevenness. This improves the appearance and prevents water from accumulating around the mounting portion 3, making it less likely to deteriorate. If there is not much vehicle traffic, the recess 112 for installing the expansion member may not be formed, and the expansion member 2 and mounting portion 3 may protrude slightly from the upper surface 10a of the embankment 10, as shown in Figures 20A to 21B described below.

In particular, it is desirable to provide an anti-slip structure on the portion of the expansion member 2 that is not covered by the cover members 105 and 106 and that becomes the upper surface in the folded state. This allows people, motorcycles, etc. to pass safely without slipping.

The anti-slip structure is, for example, as shown enlarged in Figures 2B and 2C, composed of an uneven surface including rectangular convex portions 34 and concave portions 35 surrounding them. This allows for a simple structure to provide an anti-slip effect.

It is preferable that the recesses 35 in the uneven surface serve as drainage grooves. This will prevent water from accumulating on the surface of the expansion member 2, improving the anti-slip effect and making driving easier.

It is desirable that the recess 35 serving as a drainage groove crosses the entire width of the expansion member 2. This makes it easier for water on the surface of the expansion member 2 to be drained to the outside of the expansion member 2.

The recesses 35 serving as drainage channels may intersect the lengthwise and widthwise directions of the expansion member 2. In this way, water on the surface of the expansion member 2 can be more effectively drained out of the expansion member 2.

Although not shown, the drainage groove may have a woven structure, which provides a better anti-slip effect.

As in the first embodiment, when the water level of the river rises during the flood prevention process, air is sent into the interior of the expansion member 2 from the intake port 2c as shown in Figure 6. The operation thereafter is the same as in the first embodiment except that only the cover members 105, 106 provided on the road R portion open like a double door, so a detailed explanation is omitted. Note that, as shown in Figure 9, the side of the rubber sheet cover 114 opposite the river deforms together with the expansion member 2, so the expansion of the expansion member 2 is not hindered.

In this way, in this embodiment, the weight of the cover members 105, 106 can be supported by the expansion member 2 with a simple configuration, and since there is no need for the cover members 105, 106 alone to support the vehicle's weight, etc., the cover members 105, 106 can be made lighter, and it is easier to ensure the height of the expansion member 2 when expanded compared to when the water pressure acting on the heavy cover members 105, 106 must be supported.

In this embodiment, the mass of each of the two divided cover members 105, 106 is reduced, and the height of the free ends of the cover members 105, 106 when inflated is not too high. Therefore, even if a person is left behind on the bridge B side, the person can straddle the cover members 105, 106.

As described above, according to this embodiment, the mounting portion 3 and the expansion member 2 do not protrude beyond the upper surface 10a of the embankment 10, making it easier to travel on it and preventing flooding, including the road R portion over which the bridge is built.

Therefore, according to this embodiment, in areas of bridge section B where automobiles pass, the expansion member 2 is covered by the cover members 105, 106, allowing vehicles to pass, whereas in areas other than bridge section B where vehicles do not pass, the cover members 105, 106 can be omitted, and instead the mounting section 3 is covered by the rubber sheet cover 114, so that the mounting section 3 does not get in the way.

--Modifications--
The recess 112 for installing the expansion member is not limited to the inclined cross-section shown in Figure 8A, but rather, as shown in Figure 8B, the recess 112' for installing the expansion member may be formed so that it is deep around the mounting portion 103' and shallow around the expansion member 2.

In this case, for example, the shape of the mounting portion 103' itself may be shaped to reduce the unevenness of the recess 112' for installing the expansion member.

Even in this modified example, the mounting portion 103' and the expansion member 2 do not protrude from the surface 10a of the embankment 10, so they do not interfere with the passage of people, bicycles, etc. passing along the embankment.

Naturally, as shown in Figure 8D, the present modified example may also be configured for a road R leading to bridge section B.

(Embodiment 3)
12 to 14 show a third embodiment of the present invention, and in particular the connecting portion 115 of the expansion member 2 will be described in detail, however, this connecting portion 115 can be applied to both the first and second embodiments.

That is, the expansion members 2 that are connected in the longitudinal direction are connected so as to be sandwiched in a closed state by the connecting parts 115 made of metal fittings or the like. Then, as shown in Figure 14, that part becomes concave, making it easier for water to enter.

For this reason, in this embodiment, the connecting part 115 is covered with a band-shaped connecting part cover 116 made of rubber or the like. The base end side of the connecting part cover 116 is attached to the expansion member installation recess 112 by a connecting part cover attachment part 117 similar to the attachment part 3. By configuring it in this way, as shown in Figure 13, it is possible to prevent incoming water from flowing in through the connecting part 115 and its surroundings.

(Embodiment 4)
15 to 21B show a waterproof structure 201 according to a fourth embodiment of the present invention, which differs from the first and second embodiments in that the object to be protected is a building P and its site A.

As shown in Figure 15, a building P or site A has an entrance/exit D through which vehicles and people enter and exit, and a passageway G leading to the entrance/exit D is used by vehicles and people. As shown in Figures 16A to 17B, in this embodiment, in the portion other than the passageway G leading to the entrance/exit D, the mounting part 3 is housed in an expansion member installation recess 212 formed on the upper surface of site A (passageway G) and does not protrude above the surface of site A, allowing vehicles and people to pass over the mounting part 3 and the expansion member 202 housed in the expansion member installation recess 212.

17A and 17B, in this embodiment, at least in the passage G portion leading to the entrance/exit D, the mounting portion 3 and the entire expansion member 202 in the folded state are covered with the cover member 5, and the cover member 5 covering the expansion member 2 in the folded state does not protrude above the surface of the site A (passage G), allowing vehicles and people to pass over the cover member 5. It is preferable that the cover member 5 is flat, but some unevenness may be acceptable, especially in cases where the volume of vehicle and pedestrian traffic is low.

In this embodiment, the expansion member 202 is not covered by the cover member 5 in areas other than the passage G, but necessary areas for people or vehicles to pass through, etc. may be configured to be covered by the cover member.

16A and 16B, the expansion member 202 and the mounting portion 3 are exposed over most of the circumference that is not covered by the cover member 5, but it is preferable that the expansion member 202 before expansion is housed in the expansion member installation recess 212. In this case, as shown in FIG. 16B, the mounting portion 3 may protrude slightly from the surface of the expansion member 202.

Furthermore, in areas other than the passageway G where there is not much vehicle traffic, as shown in Figures 20A to 21B, a recess 212 for installing the expansion member may not be formed, and the expansion member 202 and the mounting portion 3 may protrude above the top surface of the site A.

Naturally, in cases where pedestrians and bicycles are the main users and heavy vehicles rarely pass through, a configuration in which no recess 212 for installing an expansion member is formed, as shown in Figures 20A to 21B, may also be acceptable, even in the passage G portion.

In this case, for example, as shown in Fig. 20C, the end of the expansion member 202 can be covered with a mounting member 203' so that it is smooth. Similarly, the opposite end can be covered with a tip fixing member 208' that can open around a hinge portion 205' when the expansion member 202 expands.

20D, for example, the mounting member installation recess 212'' may be recessed, the base end of the expansion member 202'' may be sandwiched against the bottom surface, and the mounting member 203'' may be used to cover the recess so that the surface is smooth and allows vehicles to pass through. In this case, too, the opposite end may be covered with a tip fixing member 208' that can be opened around the hinge portion 205' when the expansion member 202 is expanded.

Although not shown, the perimeter of building P and site A is often covered with block walls or the like. In such cases, it is sufficient to cover only the parts that are not covered with block walls or the like with expansion member 202. Also, when it is desired to cover a large site A with a waterproof wall, there may be differences in the height of site A. In this case, it is sufficient to cover only the low parts of site A that are expected to be flooded with expansion member 202.

In order to protect the building P and its site A, the expansion member 202 is connected in a bent state at a certain angle (90° in this embodiment) as shown in Figures 22 and 23.

As shown in Figure 22, the connecting portion 115 of the expansion member 2 covering the corner of the site A connects a pair of intersecting expansion members 202 at, for example, 90°, and at least the upper side is covered by a connecting portion cover 116. As also shown in Figure 23, the base end side of the connecting portion cover 116 is fixed to the surface of the site A by a connecting portion cover mounting portion 117. Therefore, as in the above embodiment 3, when the expansion member 202 expands, the connecting portion cover 116 also rises up, making it possible to block water that tries to flow in.

In this manner, in this embodiment, under normal circumstances, the mounting portion 3 for attaching the expansion member 202 does not protrude above the surface of the site A, at least in the passageway G through which vehicles and people pass, so that vehicles and people can pass over the mounting portion 3 and the expansion member 202.

In this embodiment, the expansion member 202 is covered with the cover member 5 in the passage G portion where cars and people frequently pass, so the expansion member 202 is less likely to be damaged and its durability is improved compared to when vehicles and the like pass directly over the expansion member 202. In addition, the cover member 5 does not protrude from the surface of the site A, so it does not interfere with the travel of vehicles and the like.

In the event of a risk of inland water flooding in the sewer system due to river flooding or sudden rainfall, the building P and site A are waterproofed by expanding the expansion member 202, as shown in Figures 18 to 19B.

In this embodiment, as shown in Figures 22 and 23, the expansion member 202 is properly connected at the corners of site A, so that by expanding the expansion member 202, water does not flow into the corners of building P or site A.

Thus, even in this embodiment, the mounting portion 3 and the expansion member 202 do not protrude above the surface of the site A, making it easy for vehicles and people to pass over them, and flooding can be effectively prevented, including in the passage G leading to the entrance and exit.

(Embodiment 5)
Figures 24 and 25 show a waterproof structure 301 of embodiment 5 of the present invention, which differs from the above-mentioned embodiments in that, when inflated, the cross-sectional area of the expansion member 302 is maintained, in other words, the expansion member 302 is not closed but is connected to each other by a belt-shaped member 316.

The connecting portion is composed of a band-shaped member 316, which is glued so as to straddle and cover the longitudinal ends of adjacent expansion members 302, thereby connecting the expansion members 302.

In this embodiment, the expansion member 302 is not closed at the connecting portion 115 as in the above-mentioned embodiments, and therefore, as shown in Fig. 25, the change in the cross section of the expansion member 302 is suppressed at the connecting portion by the band-shaped member 316. Note that, as shown in Fig. 26, in any of the embodiments, the mating surface of the expansion member 302 may not have air entering therein and the plate-shaped portion may protrude.

In this embodiment, adjacent expansion members 302 in the longitudinal direction are connected to each other by a band-shaped member 316, so that the cross-sections of the expansion members 302 when expanded at the connecting portions can be kept almost uniform, making it difficult for water to flow into the connecting portions.

In this embodiment, the mounting portion 3 and the expansion member 302 are housed in the expansion member installation recess 312, so that they do not protrude from the surrounding area, making it easy for vehicles and people to pass through. As described above, the mounting portion 3 may be covered with the cover members 5, 105, 106 or the rubber sheet cover 114.

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

In each of the above embodiments, the cover member covers not only the expansion member but also the mounting portion, but it may cover only the expansion member without covering the mounting portion. In this case, the size of the cover member can be reduced. In this case, if the mounting portion is made of a highly rigid material with few irregularities, vehicles and people can pass over the cover member and the mounting portion.

In each of the above embodiments, an attachment portion 3 as shown in Fig. 2A etc. is provided. Although not shown in detail, an attachment portion may be provided in which the base end of an expansion member around which a rod is wound is sandwiched between a receiving member inserted into the anchor bolt and a pressing member. In this case, the rod-shaped rod is less likely to deform than a rubber member, so that the base end is less likely to come loose when a tensile load is applied.

In the above embodiment 1, the target is river flooding, but if the flood control structure 1, 101 is installed on a levee (including a seawall) facing a lake or the sea, it can of course also be applied to protection against small-scale tsunamis, high waves caused by typhoons, high tides, etc.

In the above embodiment, the expansion members 2, 202, 302 are rubber members, but as long as they can be folded and have a certain degree of rigidity, they may also be expandable members such as PVC sheets or tarpaulins.

The expansion members 2, 202, 302 may have a pattern on their surface to improve their appearance both when stored and when inflated.

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.

1. Water-resistant structure
2 Expansion member
2a Base end
2b Expansion member body
2c Air intake
2d Connecting pipe
3. Mounting section
4 Anchor bolts
5 Cover member
5a Hinge part
7 Pipe material
10 Embankment
10a Top surface
11. Fence
12 Recess for installing expansion member
12a Bottom
13 Cover member step
20 Blower system
21 Blower
22 Switching valve
23 Switching lever
24 Pressure gauge
25 Electric air intake valve
26 Control Panel
27 Supply hose
31 Canvas layer
32 Inner cover rubber
33 Outer cover rubber 101 Waterproof structure 103' Mounting portion 105, 106 Cover member 105a, 106a Hinge portion 112, 112' Recess for installing expansion member 113 Step portion for cover member 114 Rubber sheet cover (mounting portion cover)
115 Connection part 116 Connection part cover 117 Connection part cover mounting part 201 Waterproof structure 202, 202″ Expansion member 203′, 203″ Mounting member 205′ Hinge part 208′ Tip fixing member 212, 212″ Recess for mounting expansion member 301 Waterproof structure 302 Expansion member 312 Recess for mounting expansion member 316 Belt-shaped member
A. Site
B Bridge section
D Entrance/Exit
Aisle G
R Road
W Water

Claims (24)

An attachment section provided along the embankment;
an expansion member having a base end fixed to one side of the mounting portion, capable of changing its shape from a flat folded state to an expanded state by pumping air into it, and in the expanded state, contacting water whose level has risen above the top surface of the embankment to prevent the water from flowing out;
The expansion member is
a longitudinal inflatable member extending along said bank;
The base end portion,
an expansion member body that is continuous with the base end portion and is filled with air in the expanded state to expand so as to have a curved surface;
In the folded state, the upper surface is a flat plate-like shape,
A flood control structure characterized in that, in at least a portion including a road that intersects with the embankment and leads to the bridge portion, the mounting portion is accommodated in a recess for installing an expansion member formed on the upper surface of the road, so that the upper surface of the road or the embankment, the upper surface of the mounting portion or the upper surface of the mounting portion cover arranged above the mounting portion, and the upper surface of the exposed portion of the expansion member main body in the folded state are at approximately the same height, and so that vehicles and people can pass over the mounting portion and the expansion member accommodated in the recess for installing the expansion member. A mounting portion provided along a building or site having a passageway leading to an entrance and exit for vehicles and people;
an expansion member having a base end fixed to one side of the mounting portion, capable of changing its shape from a flat folded state to an expanded state by supplying air thereinto, and contacting water at a raised water level in the expanded state to prevent the water from flowing out;
The expansion member is
a length of inflatable member along the building or site;
The base end portion,
an expansion member body that is continuous with the base end portion and is filled with air in the expanded state to expand so as to have a curved surface;
In the folded state, the upper surface is a flat plate-like shape,
A flood prevention structure characterized in that, in at least a portion including the passage leading to the entrance/exit, the mounting portion is accommodated in a recess for installing an expansion member formed on the upper surface of the passage, such that the upper surface of the passage, the upper surface of the mounting portion or the upper surface of a mounting portion cover arranged above the mounting portion, and the upper surface of the exposed portion of the expansion member main body in the folded state are at approximately the same height, and the mounting portion and the expansion member accommodated in the recess for installing an expansion member are configured to allow vehicles and people to pass over them. 3. The waterproof structure according to claim 1, wherein the recess for installing the expansion member is formed so that the recess is deep around the mounting portion and shallow around the expansion member. The water prevention structure described in claim 3, characterized in that the mounting portion is covered by the three- dimensional mounting portion cover inside the expansion member installation recess so as to fill any gaps, and is configured to allow vehicles and people to pass over the mounting portion cover and the expansion member. 3. The waterproof structure according to claim 1, wherein the plurality of expansion members have connecting portions at their longitudinal ends. The water prevention structure described in claim 5, characterized in that the connecting portion is made of a plurality of metal plates, and the longitudinal ends of the plurality of expansion members are sandwiched between the plurality of metal plates, and the connecting portion is covered with a connecting portion cover to reduce unevenness and prevent water from leaking from the connecting portion. 6. The waterproof structure according to claim 5 , wherein a communication pipe extending in the longitudinal direction is provided inside the connecting portion, so that adjacent expansion members in the longitudinal direction are in communication with each other. 6. The waterproof structure according to claim 5 , wherein the longitudinal ends of the expansion members are connected in a sealed state at the connecting portions. The water prevention structure described in claim 5, characterized in that the connecting portion is composed of a band-shaped member, and the band-shaped member is bonded in a state in which it covers and straddles the longitudinal ends of adjacent expansion members, thereby connecting the expansion members . 3. The flood control structure according to claim 2, wherein a plurality of the expansion members are connected also at corners of the building or site. 3. The waterproof structure according to claim 1, wherein an anti-slip structure is provided on a portion of the inflatable member that becomes an upper surface in the folded state. The waterproof structure according to claim 11 , characterized in that the anti-slip structure has an uneven surface. The flood prevention structure according to claim 12 , characterized in that the uneven surface forms a drainage groove. 14. A flood control structure as claimed in claim 13 , characterized in that the drainage groove traverses the entire width of the expansion member. The flood prevention structure according to claim 13 , characterized in that the drainage grooves intersect the lengthwise and widthwise directions of the expansion member. The flood control structure according to claim 13, characterized in that the drainage groove has a woven structure. 3. The waterproof structure according to claim 1, wherein the expansion member is reinforced with a woven fabric. 3. The waterproof structure according to claim 1, wherein the rigidity of the sheet member above the air chamber in the inflatable member is greater than the rigidity of the sheet member below the air chamber. 3. The waterproof structure according to claim 1, wherein a thickness of the sheet member above the air chamber in the inflatable member is greater than a thickness of the sheet member below the air chamber. 3. The waterproof structure according to claim 1, wherein the inflatable member includes a sheet of ethylene propylene rubber. A waterproof structure as described in claim 1 or 2, characterized in that a groove, protrusion or hollow portion extending in the longitudinal direction is provided on the inner surface of the expansion member, and the groove, protrusion or hollow portion is configured to guide the air in the expansion member to a hole portion that can communicate with the outside of the expansion member when exhausted. An attachment section provided along the embankment;
an expansion member having a base end fixed to one side of the mounting portion, capable of changing its shape from a flat folded state to an expanded state by pumping air into it, and in the expanded state, contacting water whose level has risen above the upper surface of the embankment to prevent the water from flowing out;
The expansion member is
a longitudinal inflatable member extending along said bank;
The base end portion,
an expansion member body that is continuous with the base end portion and is filled with air in the expanded state to expand so as to have a curved surface;
In the folded state, the upper surface is a flat plate-like shape,
A flood control structure characterized in that, at least in the portion including the road that intersects the embankment and leads to the bridge, the upper surface of the road or the embankment, the upper surface of the mounting part or the upper surface of the mounting part cover arranged above the mounting part, and the upper surface of the exposed part of the expansion member body in the folded state are at approximately the same height, and the structure is configured to allow vehicles and people to pass over the mounting part and the expansion member. A mounting portion provided along a building or site having a passageway leading to an entrance and exit for vehicles and people;
an expansion member having a base end fixed to one side of the mounting portion, capable of changing its shape from a flat folded state to an expanded state by supplying air thereinto, and contacting water at a raised water level in the expanded state to prevent the water from flowing out;
The expansion member is
a length of inflatable member along the building or site;
The base end portion,
an expansion member body that is continuous with the base end portion and is filled with air in the expanded state to expand so as to have a curved surface;
In the folded state, the upper surface is a flat plate-like shape,
A flood prevention structure characterized in that, in at least a portion including the passage leading to the entrance/exit, the upper surface of the passage, the upper surface of the mounting part or the upper surface of the mounting part cover arranged above the mounting part, and the upper surface of the exposed part of the expansion member main body in the folded state are at approximately the same height, and the structure is configured to allow vehicles and people to pass over the mounting part and the expansion member. The portion between the upper surface of the exposed end of the expansion member body in the folded state and the upper surface of the road or the passage is covered with a tip fixing member.
24. A waterproof structure according to claim 22 or 23.