Flood prevention structure and flood prevention method

Abstract

The flood control structure (1) comprises an attachment section (3) provided along a river embankment (10), and an expansion member (2) whose base end (2a) is fixed to the attachment section (3) and which is shape-changeable from a folded state to an expanded state by pumping air into it, and which, when expanded, prevents the outflow of water (W) whose water level rises above the upper surface (10a) of the embankment (10). The expansion member (2) is made of a long, expandable member that extends along the embankment 10, and has a base end (2a) fixed to the attachment section (3) and an expansion member main body (2b) that is filled with air and expands to have a curved surface when in the expanded state. In the expanded state, the inflowing water (W) pushes against the expansion member main body (2b), and the attachment section (3) on the river or sea side is subjected to a tensile load.

Description

[Technical Field]

[0001] The present invention relates to a water-resistant structure provided with an inflatable member and a water-resistant method using the same. [Background technology]

[0002] Conventionally, a flood prevention structure using flexible long bags has been known (see, for example, Patent Document 1), which comprises multiple pairs of anchoring means embedded in rows at predetermined intervals along the length of a levee constructed to protect against river flooding and seawater intrusion onto land, flexible long bags placed on the top surface of the levee along the length of the levee and which expand and stand when fluid is supplied and collapse when fluid is discharged, and a plurality of flexible connecting members that can be moored to the anchoring means arranged in rows.

[0003] Also, for example, as disclosed 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 a river embankment or 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 the storage box, and by supplying fluid to the waterproof fence, the opening / closing lid opens, causing the waterproof fence to stand up and extend. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 64-21111 [Patent Document 2] Patent No. 3656769 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the waterproof structure of Patent Document 1, a large number of flexible connecting members cover the entire top surface of the long bag body, which makes it look unsightly under normal conditions, and the protrusions get in the way, and there are also problems in that the height of the long bag body cannot be increased when inflated.

[0006] Furthermore, in the inflatable waterproof fence device of Patent Document 2, the height of the waterproof fence is greater than the width of the pair of mounting parts, and the fence must be installed so as not to place excessive load on the mounting parts, which poses the problem of requiring large-scale equipment.

[0007] The present invention was made in consideration of these points, and its purpose is to provide a protective gear that is not in the way and looks good when folded, and that expands greatly when inflated to prevent water from entering. [Means for solving the problem]

[0008] In order to achieve the above object, in the present invention, only the base end of the expansion member is fixed to the embankment.

[0009] Specifically, the flood prevention structure of the first invention comprises: a mounting portion provided along a river or sea embankment; an expansion member whose base end is fixed to the mounting part, whose shape can be changed from a flat folded state to an expanded state by inflating it by supplying air therein, and which prevents the outflow of water whose level has risen above the top surface of the embankment when in the expanded state; The expansion member is a long inflatable member along the bank; The base end portion; an expansion member body that is filled with air and expands to have a curved surface in the expanded state, In the expanded state, the expansion member body is pushed by water overflowing the upper surface of the embankment, and the mounting portion on the river or sea side is subjected to a tensile load.

[0010] According to the above configuration, when the expansion element is in a flat, folded state, it looks good without any protrusions, and when it is in an inflated state, only the base end is fixed to the mounting part, making it easy to install. Furthermore, since the expansion element is inflated by air, it is easier to inflate than liquid, and it can be easily restored to its original state by simply returning it to its flat, folded state. Furthermore, since the tensile load is borne by the mounting part, it is easier to support the load, eliminating the need for fence members to support the expansion element itself, and simplifying the structure. Note that the term "embankment" generally refers to a structure made of earth, stone, or concrete built along a riverbank or coast to prevent river flooding or seawater intrusion, but it also includes the wall of a bank without any embankment, such as a small river flowing through an urban area.

[0011] In the second invention, in the first invention, The expansion member is In the folded state, the surface is a flat plate, and the expansion member is placed on the upper surface of the embankment and configured to be walkable on the expansion member; In the expanded state, the device is configured to expand with its base end fixed to the mounting portion, thereby preventing water from flowing out of the river.

[0012] According to the above configuration, when folded, the surface becomes a flat plate, allowing people to walk on it without getting in the way, and the softness inherent to rubber makes it easy for pedestrians to walk on. Furthermore, because the expansion member body expands with the base end fixed, a fence to support the expansion member is not necessarily required, and the height can be easily ensured.

[0013] In the third invention, in the second invention, The portion of the expansion member that becomes the upper surface in the folded state is provided with an anti-slip structure.

[0014] According to the above configuration, walking or running on the inflatable member in the folded state is safe and non-slip.

[0015] In a fourth aspect of the present invention, in the first aspect of the present invention, The mounting portion is disposed along the river or sea-facing inner surface of the levee, The expansion member is a connecting portion that connects the mounting portion and the expansion member main body, In the folded state, the levee is disposed along the river or sea-facing inner surface thereof, In the expanded state, the suction port rises as the water level of the river rises, The connecting portion can be bent and inverted onto the upper surface of the bank.

[0016] According to the above configuration, in the folded state, the mounting part and the expansion member main body are positioned on the river or sea side of the inner surface of the embankment, so it looks good and does not get in the way when walking or running on the embankment. Furthermore, when inflated, the connecting part bends and flips over onto the top surface of the embankment, so the gradual rise in the water level can be seen at a glance. Furthermore, the length of the connecting part can be adjusted, so there is a high degree of freedom in the position of the mounting part.

[0017] In the fifth invention, in the first invention, The mounting portion is An anchor bolt embedded in the upper surface of the embankment; a receiving member that is inserted into the anchor bolt and that contacts the upper surface of the embankment; The anchor bolt is inserted into a pressing member that, together with the receiving member, clamps and holds the base end of the expansion member.

[0018] In the sixth invention, in the fourth invention, The mounting portion is An anchor bolt embedded in the river or sea side inner surface; a receiving member that is inserted into the anchor bolt and that contacts the river or sea side inner surface; The anchor bolt is inserted into a pressing member that, together with the receiving member, clamps and holds the base end of the expansion member.

[0019] According to these configurations, the base end of the expansion member is sandwiched between the receiving member and the pressing member and prevented from coming out, so that the base end is prevented from coming out even if it is subjected to a tensile load by the flowing-in water.

[0020] In the seventh invention, in the fifth or sixth invention, The base end of the expansion member, around which a rod-shaped member is wound, is sandwiched between the receiving member and the pressing member.

[0021] According to the above configuration, the bar-shaped rod is less likely to deform than the expandable member, and therefore the base end portion is less likely to come off when a tensile load is applied.

[0022] In the flood prevention method of the eighth invention, an installation step of attaching a mounting portion to a river bank along an upper surface of the bank and fixing a base end of an expansion member made of a flat, folded, plate-like expansion member having a flat surface to the mounting portion; and a flood prevention step of, when the water level of the river rises, sending air into the inside of the expansion member body of the expansion member, and inflating the expansion member with the base end fixed to the mounting part, thereby preventing the outflow of water whose water level has risen above the upper surface of the levee, The inflatable member in the collapsed state can be walked on.

[0023] According to the above configuration, the installation of the inflatable member is easy because it is only necessary to fix at least the base end of the inflatable member in the flat, folded state. Furthermore, since the inflatable member can be inflated by pumping air into it, it takes less time than pumping liquid into it, and it is easy to return it from the inflated state to the flat, folded state. Furthermore, since it is only necessary to fix at least the base end of the inflatable member, it is easy to ensure the height of the inflatable member, and water leakage can be effectively prevented. Moreover, in the folded state, it is possible to walk on it, so it does not get in the way, and the inherent softness of rubber makes it easy for pedestrians to walk on it.

[0024] In the flood prevention method of the ninth aspect of the present invention, an installation step of attaching a mounting portion to a river bank along the river or sea-facing inner surface of the bank and fixing a base end of an expansion member made of an expandable member in a folded state to the mounting portion; The structure includes a flood prevention process in which, when the water level of the river rises, air is sent into the inside of the expansion member body of the expansion member, causing it to inflate with its base end fixed to the mounting part, so that the connecting part connecting the mounting part and the expansion member body bends and inverts onto the top surface of the embankment, thereby preventing the outflow of water whose water level has risen above the top surface of the embankment.

[0025] According to the above configuration, the installation of the inflatable member is easy because it is only necessary to fix at least the base end of the inflatable member in the folded state. Furthermore, since the inflatable member can be inflated by pumping air into it, it takes less time than pumping liquid into it, and it is easy to return it from the inflated state to the folded state. Furthermore, when installed on the river- or sea-facing inner surface of the levee, the inflatable member is not present on the top surface of the levee, which looks good and does not get in the way when walking or running along the levee. When inflated, the connecting portion bends and flips over onto the top surface of the levee, allowing the gradual rise in the water level to be seen at a glance. [Effects of the Invention]

[0026] As described above, according to the present invention, in the folded state, the bag is not in the way and looks good, and in the expanded state, it expands greatly and can prevent water from entering. [Brief explanation of the drawings]

[0027] [Figure 1A] 1 is a cross-sectional view showing a folded state of a waterproof structure according to a first embodiment of the present invention. [Figure 1B] 1 is a cross-sectional view showing an expanded state of a waterproof structure according to a first embodiment of the present invention. [Figure 1C] 1 is a cross-sectional view showing how water is prevented from leaking out of the waterproof structure according to the first embodiment of the present invention. [Figure 2] 1 is an enlarged cross-sectional view showing a mounting portion and its surroundings according to the first embodiment of the present invention. [Figure 3] 1 is a diagram showing an outline of a blower system of a waterproof structure according to a first embodiment of the present invention. [Figure 4A] FIG. 3 is a cross-sectional view showing a waterproof structure according to a first modification of the first embodiment of the present invention in a folded state. [Figure 4B] FIG. 3 is a cross-sectional view showing an expanded state of a waterproof structure according to a first modification of the first embodiment of the present invention. [Figure 5A] FIG. 4 is a cross-sectional view showing a normal state of a waterproof structure according to a second modification of the first embodiment of the present invention. [Figure 5B] FIG. 10 is a cross-sectional view showing a waterproof structure according to a second modification of the first embodiment of the present invention in a folded state. [Figure 5C] FIG. 10 is a cross-sectional view showing an expanded state of a waterproof structure according to a second modification of the first embodiment of the present invention. [Figure 6A] FIG. 6 is a cross-sectional view showing a waterproof structure according to a second embodiment of the present invention in a folded state. [Figure 6B] FIG. 6 is a cross-sectional view showing an expanded state of a waterproof structure according to a second embodiment of the present invention. [Figure 6C] FIG. 10 is a cross-sectional view showing an expanding member of a waterproof structure according to a second embodiment of the present invention floating on the surface of high-water levels. [Figure 6D] FIG. 10 is a cross-sectional view showing the state in which the expanding member of the waterproof structure according to the second embodiment of the present invention floats on the water surface at a higher water level. [Figure 6E] FIG. 10 is a cross-sectional view showing an expanding member of a flood prevention structure according to a second embodiment of the present invention floating on a water surface higher than the front of the embankment. [Figure 6F] FIG. 4A is a cross-sectional view of a waterproof structure according to a first modified example of the second embodiment of the present invention. [Figure 6G] FIG. 4A is a cross-sectional view of a waterproof structure according to a second modification of the second embodiment of the present invention. [Figure 7A] FIG. 10 is a cross-sectional view showing a waterproof structure according to a third modification of the second embodiment of the present invention in a folded state. [Figure 7B] FIG. 10 is a cross-sectional view showing an expanded state of a waterproof structure according to a third modification of the second embodiment of the present invention. [Figure 7C] FIG. 10 is a cross-sectional view showing how an expanding member of a waterproof structure according to a third modification of the second embodiment of the present invention floats on the surface of high-water levels. [Figure 7D] FIG. 10 is a cross-sectional view showing how an expanding member of a waterproof structure according to a third modification of the second embodiment of the present invention floats on the water surface at a higher water level. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, each embodiment of the present invention will be described with reference to the drawings.

[0029] (Embodiment 1) -Waterproof structure- 1A to 1C show a flood control structure 1 according to a first embodiment of the present invention, which includes a mounting portion 3 attached to a river levee 10 so as to extend along the levee 10. The mounting portion 3 may be provided in a straight line, or may be bent or curved to fit the river.

[0030] As shown enlarged in Fig. 2A, a base end 2a of the expansion member 2 is fixed to the mounting part 3. This expansion member 2 can be changed in shape from the flat folded state shown in Fig. 1A to an expanded state (see Fig. 1B) in which it expands by pumping air into the interior, and in the expanded state, it can prevent the outflow of water W whose level has risen above the upper surface 10a of the embankment 10.

[0031] The expansion member 2 is a long rubber member that extends along the embankment 10. While not shown in detail, this rubber member is a multilayer member and includes a base end 2a and an expansion member main body 2b that expands to form a curved surface. The base end 2a includes a reinforcing core, an outer core layer, and a cover rubber. The expansion member main body 2b includes an expansion section core, a reinforcing core, an outer core layer, and a cover rubber. Each rubber layer is provided with canvas or a core material for reinforcement. The expansion section core may be filled with filler rubber to prevent air leakage. Furthermore, a release agent may be applied to the expansion section cores to facilitate separation during expansion. The base end 2a may be long, and a plate-shaped, non-expanding connecting portion (e.g., connecting portion 402d in FIG. 7A) may be provided between the mounting portion 3 and the expansion member main body 2b. Although not shown in detail, the base end 2a is provided with an intake 2c for taking in air from a blower (shown only in FIG. 3). Although the configuration is not particularly limited, the intake port 2c may be, for example, a cylindrical member that is in airtight communication with the interior of the expansion member main body 2b (expansion portion core body). Also, a non-expanding fin-shaped joint portion (for example, joint portion 402e in FIG. 7D) may be provided on the side opposite the base end portion 2a of the expansion member 2.

[0032] As shown in FIG. 1A, the expansion member 2 is plate-shaped in the folded state, and is placed on the river-side upper surface 10a of the levee 10, allowing people to walk on the expansion member 2.

[0033] On the other hand, the expansion member 2 is configured to expand in an expanded state with the base end portion 2a fixed to the attachment portion 3, thereby preventing the outflow of water W from the river.

[0034] The portion of the expansion member 2 that becomes the upper surface in the folded state is provided with an anti-slip structure such as an uneven surface, which prevents pedestrians M from slipping when walking or running on the expansion member 2 in the folded state, making it safe.

[0035] As shown in Figure 2A, the mounting portion 3 includes an anchor bolt 4 embedded in the upper surface 10a of the embankment 10, a receiving member 3a inserted through the anchor bolt 4 and in contact with the upper surface 10a of the embankment 10, and a retaining member 3b inserted through the anchor bolt 4 and, together with the receiving member 3a, clamping and holding the base end portion 2a of the expansion member 2.

[0036] The base end 4a of the anchor bolt 4 is bent in an L-shape to prevent it from coming loose. It is desirable that the anchor bolts 4 are embedded in the concrete 5 so that the direction of extension of the bent base end 4a is in line with the tensile load during flooding. The anchor bolts 4 are installed in a row at specified intervals along the levee 10. The anchor bolts 4 are suitably made of stainless steel, which is resistant to rust.

[0037] If the receiving member 3a and the pressing member 3b are provided with projections and recesses of complementary shapes, it is advantageous because when the base end portion 2a is clamped and fastened, the base end portion 2a is less likely to come off.

[0038] The flood prevention structure 1 of this embodiment has a blower system 20 shown in Fig. 3. This blower system 20 is provided, for example, on the upper surface 10a of the embankment 10, and includes, for example, 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 inflatable member 2.

[0039] -Flood prevention methods- Next, a flood prevention method according to this embodiment will be described.

[0040] First, in the installation process, the mounting parts 3 are attached to a river levee 10 along the levee 10. Specifically, as shown in FIG. 2A , anchor bolts 4 are embedded at predetermined intervals into an existing or new levee 10. As described above, the anchor bolts 4 are embedded into concrete 5 so that the direction in which their bent base ends 4a extend is in line with the tensile load during flooding. Only the tips of the anchor bolts 4 protrude from the surface of the concrete 5.

[0041] Then, the base end 2a of the expansion member 2, which is in a flat, folded state and has a flat surface, is fixed to the mounting part 3. Specifically, the tip of the anchor bolt 4 is passed through a through hole (not shown) of the receiving member 3a so that the flat surface of the receiving member 3a abuts against the upper surface of the concrete 5.

[0042] Next, the tip is inserted through the through hole (not shown) of the base end 2a of the expansion member 2, and then through the through hole (not shown) of the holding member 3b, and the base end 2a is sandwiched between the holding member 3b and the receiving member 3a.

[0043] Next, the fastening nut 4b is inserted into the tip of the anchor bolt 4 and tightened with a predetermined tightening torque. In this way, it is only necessary to fix at least the base end portion 2a of the expansion member 2 in the folded state, so that the expansion member 2 can be easily attached.

[0044] At this time, as shown in Fig. 1A, the inflatable member 2 is spread out in a plate-like state so as to be as flat as possible on the upper surface 10a of the embankment 10. In this folded state, it looks good and pedestrians M can walk on it. Therefore, the inflatable member 2 does not get in the way, and the softness inherent to rubber makes it easy for pedestrians M to walk or run on it.

[0045] 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 through the intake port 2c, as shown in Figure 3. Specifically, after connecting the supply hose 27 from the blower 21 to the air intake port 2c of the expansion member 2, the control panel 26 is operated to start the blower 21, and air is sent into the expansion member main body 2b.

[0046] Then, as shown in FIG. 1B, the expansion member main body 2b of the expansion member 2 expands with the base end portion 2a fixed to the attachment portion 3.

[0047] If the water level rises further, as shown in Figure 1C, the expanded expansion member body 2b 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 to support the expansion member 2 is not necessarily required, and the increased strength makes it easier to ensure height.

[0048] In this way, the expansion member 2 of this embodiment can be expanded by simply pumping air into it, which takes less time than pumping liquid into it, and even when it is folded again, it is easy to return it from the expanded state to a flat state.

[0049] Furthermore, in this embodiment, the base end 2a of the expansion member 2 is sandwiched between the receiving member 3a and the holding member 3b and prevented from coming out, so that the base end 2a is prevented from coming out even if it is subjected to a tensile load by the flowing-in water W.

[0050] Therefore, the waterproof structure 1 according to this embodiment is less obtrusive and looks good when folded, and expands greatly when inflated to prevent water W from entering.

[0051] -Modification 1 of Embodiment 1- 4A and 4B show a waterproof structure 101 according to a first variation of the first embodiment of the present invention, which differs from the first embodiment in that the shape of the expansion member 102 in the folded state (wound state) is different. In the following variations and the second embodiment, the same parts as those in Figs. 1A to 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

[0052] In the floodproof structure 101 according to this modification, the expansion member 102 is not flat when folded, but is rolled up. This configuration is suitable for locations where the installation space is narrow and it is not possible to place a flat expansion member 2 as in the first embodiment. When the expansion member 102 is inflated, it automatically opens due to air pressure.

[0053] In this modified example, the pedestrian M cannot walk on the expansion member 102, but can walk beside it.

[0054] Therefore, the expansion member 102 of this modified example may be installed only in a partial area of ​​the embankment 10.

[0055] -Modification 2 of Embodiment 1- 5A to 5C show a flood control structure 201 according to a second modification of the first embodiment of the present invention, which differs from the first embodiment in that the installation position is in front of bridge A and the resulting configuration is different.

[0056] In this modified example, since the location is just before bridge A over which automobiles C and the like pass, it cannot be permanently installed like the expansion member 2 in embodiment 1 above. Therefore, as shown in Figure 5A, the mounting portion 3 is housed in a gutter G, and when the water level rises, the cover L of the gutter G is opened and the base end portion 2a of the expansion member 202 is attached to the mounting portion 3, as shown in Figure 5B.

[0057] Then, even if the water level rises and becomes higher than bridge A, as shown in Figure 5C, water W will not flow into the front side of bridge A.

[0058] For example, the portion of the embankment 10 other than the portion in front of the bridge A may be configured as the flood control structure 1 of the first embodiment, with only the portion in front of the bridge A having the configuration of this modified example.

[0059] With the configuration of this modified example, the mounting portion 3 does not get in the way even in areas where automobile C passes, and the expansion member 202 is not damaged. However, since it takes time and effort to transport the expansion member 202 and fix it to the mounting portion 3, it is advisable to keep the area as small as possible.

[0060] (Embodiment 2) 6A to 6E show a waterproof structure 301 according to a second embodiment of the present invention, which differs from the first embodiment in that the attachment position of the attachment portion 3 is different.

[0061] In this embodiment, in the installation process, the receiving member 3a of the mounting part 3 is provided so as to contact the river-side inner surface 10b of the embankment 10. In addition, the expansion member 2 is arranged along the river-side inner surface 10b of the embankment 10 in the folded state, and in the expanded state, rises as the water level of the river rises and can be inverted onto the upper surface 10a of the embankment 10.

[0062] As shown in FIG. 6A, the mounting portion 3 and the expansion member 2 in the folded state are usually not on the upper surface 10a of the embankment 10, so that it looks good and does not get in the way.

[0063] Next, in the flood prevention step, in the expanded state shown in FIG. 6B, the expanded expansion member 2 is initially located closer to the river than the levee 10.

[0064] As shown in FIG. 6C, as the water level rises, the expansion member 2 also rises, so that pedestrians M and the like can easily see that the water level is rising.

[0065] As shown in Figure 6D, if the water level rises further, it becomes clear that the water level is quite dangerous.

[0066] Furthermore, as shown in FIG. 6E, when the water level rises further, the expansion member 2 is inverted onto the upper surface 10a of the embankment 10, and the height can be maintained, so that the outflow of the water W can be effectively prevented.

[0067] -Modification 1 of Embodiment 2- FIG. 6F shows a flood control structure 301' according to a first modification of the second embodiment of the present invention, in which the shape of the embankment 10' differs from that of the above-described embodiments.

[0068] That is, the width of the upper surface 10a' of the embankment 10' is narrow. In other words, this modified example is advantageous when the width is too narrow to ensure sufficient space for installing the flat-plate-shaped expansion member 2.

[0069] In this case, too, only the base end 2a of the expansion member 2 is fixed to the mounting part 3 provided on the river-side inner surface 10b', so even if the width of the upper surface 10a' of the embankment 10' is narrow, there is no problem, and the tensile load applied to the base end 2a can be supported by the mounting part 3, thereby preventing the intrusion of water W.

[0070] -Modification 2 of Embodiment 2- FIG. 6G shows a flood prevention structure 301'' according to a second modification of the second embodiment of the present invention, in which the shape of the embankment 10'' is different from that of the above-described embodiments.

[0071] That is, the inner surface 10b'' of the levee 10'' facing the river is inclined, and the width of the upper surface 10a'' is also narrow.

[0072] In this modification as well, the tensile load applied to the base end portion 2a can be supported by the attachment portion 3, so that the intrusion of water W can be effectively prevented.

[0073] -Modification 3 of Embodiment 2- 7A to 7D show a waterproof structure 401 according to a second modification of the second embodiment of the present invention, which differs from the above-described embodiments mainly in that the inflatable member 402 is below the water surface when folded.

[0074] That is, in this modified example, a large-area plate-shaped connecting portion 402d is formed between the base end portion 402a, which is clamped by the mounting portion 3, and the expansion portion 402b, and the expansion portion 402b is connected to the tip side of the connecting portion 402d.

[0075] As shown in FIG. 7D, a fin-shaped (strip-shaped) joint portion 402e that does not allow air to enter may be provided on the tip side of the expansion portion 402b.

[0076] This modified example is intended for relatively small waterways into which stones, rocks, etc. are unlikely to flow, and a mounting portion 3 and an expansion member 402 are also provided on the opposite side.

[0077] As shown in FIG. 7A, at least a portion of the expansion member 402 is normally hidden below the water surface, providing a good appearance.

[0078] When inflated, the inflated inflatable portion 402b floats on the water surface as shown in FIG. 7B.

[0079] 7C, the expansion section 402b gradually rises as the water level of the river water W rises, allowing the pedestrian M to tell at a glance that the water level is rising.

[0080] Then, as shown in FIG. 7D, when the water level rises above the upper surface 10a of the levee 10, the expansion portion 402b inverts and rides onto the upper surface 10a of the levee 10, preventing the river water W from overflowing.

[0081] In this way, in this modification as well, the tensile load applied to the base end portion 2a can be supported by the attachment portion 3, so that the intrusion of water W can be effectively prevented.

[0082] (Other embodiments) The present invention may be configured as follows in relation to the above embodiment.

[0083] That is, in the above embodiment, the mounting portion 3 shown in Fig. 2A is provided. Although not shown in detail, a mounting 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, and therefore the base end is less likely to come off when a tensile load is applied.

[0084] In the above embodiment, the target is river flooding, but if the flood control structure 1 is installed on a levee (including a seawall) facing the sea, it can of course also be applied to protection from small tsunamis, high waves caused by typhoons, high tides, etc.

[0085] In the above embodiment, the expansion member 2 is a rubber member, but it may be an expandable member such as a vinyl chloride sheet or tarpaulin as long as it can be folded or rolled and has a certain degree of rigidity.

[0086] The expansion member 2 may have a pattern on its surface to improve its appearance both when stored and when inflated.

[0087] It should be noted that the above-described embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or uses. [Explanation of symbols]

[0088] 1. Flood prevention structure 2 Expansion member 2a,2a' proximal end 2b Expansion member body 2c Air intake 3,3' Mounting part 3a, 3a' Receiving member 3b, 3b' holding member 3c' Rod 3d' Vis 4.4' anchor bolt 4a proximal end 4b Fastening nut 5. Concrete 10,10',10'' embankment 10a,10a',10a'' Top surface 10b, 10b', 10b'' River side inner surface 20 Blower System 21 Blower 22 Switching valve 23 Switching lever 24 Pressure gauge 25 Electric air supply valve 26 Control Panel 27 Supply hose 101 Flood prevention structure 102 Expansion member 201 Flood prevention structure 202 Expansion member 301, 301', 301'' flood prevention structure 401 Flood prevention structure 402 Expansion member 402a Proximal end 402b Expansion section 402d Connection part 402e Joint Bridge A C car G gutter W water

Claims

1. An attachment part provided along a levee; 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 expanded state, the expansion member body is pushed by water that exceeds the upper surface of the embankment, and the mounting portion that is closer to the water than the expansion member body is subjected to a tensile load. A waterproof structure characterized by:

2. The expansion member is In the folded state, the surface is a flat plate-like shape, and the inflatable member is placed on the upper surface of the embankment and configured to be walkable on the inflatable member; In the inflated state, the inflatable device is inflated with the base end fixed to the mounting portion to prevent water from leaking out. A waterproof structure as claimed in claim 1.

3. The portion of the expansion member that becomes the upper surface in the folded state is provided with an anti-slip structure.

3. The waterproof structure according to claim 2.

4. An attachment portion provided along the embankment; an expansion member having a base end fixed to the mounting portion, capable of changing its shape from a flat folded state to an expanded state by inflating it by supplying air therein, and capable of preventing the outflow of water at a water level higher than 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 filled with air and expands to have a curved surface in the expanded state; In the expanded state, the expansion member body is pushed by water over the top surface of the embankment, and the mounting portion on the water side is subjected to a tensile load, The mounting portion is disposed along the water side inner surface of the embankment, The expansion member is A connecting portion that connects the mounting portion and the expansion member main body, In the folded state, the barrier is disposed along the water side inner surface of the embankment, In the expanded state, it rises as the water level rises, The connecting portion can be bent and inverted onto the upper surface of the embankment. A waterproof structure characterized by:

5. The mounting portion is An anchor bolt embedded in the upper surface of the embankment; A receiving member that is inserted through the anchor bolt and contacts the upper surface of the embankment; a pressing member that is inserted through the anchor bolt and that, together with the receiving member, clamps and holds the base end of the expansion member.

2. The waterproof structure according to claim 1.

6. A mounting portion provided along the embankment; an expansion member having a base end fixed to the mounting portion, capable of changing its shape from a flat folded state to an expanded state by inflating it by supplying air therein, and capable of preventing the outflow of water at a water level higher than 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 filled with air and expands to have a curved surface in the expanded state; In the expanded state, the expansion member body is pushed by water over the top surface of the embankment, and the mounting portion on the water side is subjected to a tensile load, The mounting portion is disposed along the water side inner surface of the embankment, The expansion member is A connecting portion that connects the mounting portion and the expansion member main body, In the folded state, the barrier is disposed along the water side inner surface of the embankment, In the expanded state, it rises as the water level rises, The connecting portion can be bent and inverted onto the upper surface of the embankment, The mounting portion is An anchor bolt embedded in the water side inner surface; A receiving member that is inserted through the anchor bolt and contacts the water side inner surface; a pressing member that is inserted through the anchor bolt and that, together with the receiving member, clamps and holds the base end of the expansion member. A waterproof structure characterized by:

7. The base end of the expansion member, around which a rod-shaped rod is wound, is sandwiched between the receiving member and the pressing member.

7. A waterproof structure according to claim 5 or 6.

8. An installation process comprising: attaching a mounting part to a levee along an upper surface of the levee, and fixing a base end of an expansion member consisting of an expandable member in a folded, flat-plate shape having a flat surface to one side of the mounting part; and a flood prevention process for preventing the outflow of water whose level has risen above the upper surface of the embankment when the water level rises by feeding air into the inside of the expansion member body of the expansion member and inflating it with its base end fixed to one side of the mounting portion, so that the expansion member body is pushed by water that has risen above the upper surface of the embankment and the mounting portion that is on the water side of the expansion member body is subjected to a tensile load. It is possible to walk on the expansion member in the folded state. A waterproofing method comprising:

9. An installation process for attaching a mounting part to a levee along the water side inner surface of the levee and fixing a base end of an expansion member consisting of an expandable member in a folded state to the mounting part; and a flood prevention process in which, when the water level rises, air is pumped into the inside of the expansion member body of the expansion member, and the expansion member is inflated with the base end fixed to the attachment part, so that a connecting part connecting the attachment part and the expansion member body is bent and inverted onto the upper surface of the embankment, thereby preventing the outflow of water whose water level has risen above the upper surface of the embankment. A waterproofing method comprising:

10. The base end is fixed only to the water side of the mounting portion.

2. The waterproof structure according to claim 1.

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