JP2007113261A - Water stop institution equipped with standing-up posture securing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water stop institution equipped with a standing-up posture securing mechanism capable of solving such a problem that the water stop institution is going to be pushed down to a lower water level side, of realizing a storage type water stop institution having a large closable width by preventing the incursion of a Tsunami with higher waves and of enlarging an area capable of being protected by the stop water institution. <P>SOLUTION: A fulcrum is provided in the vicinity of the end section of an arm with the length capable of ensuring approximately the same height as that of a cut-off plate at least in a standing state, the other fulcrum is also provided in the vicinity of the basic bottom section of the cut-off plate in the standing state, it is combined with the fulcrum on the arm to mount the arm in a movable manner, at the same time, a tie section is provided in the vicinity of the end section separated from an oscillating fulcrum of the arm, and the water stop institution is equipped with a cut-off plate standing-up posture securing mechanism having such a constitution that the tie section provided to the arm is made to tie in with a chain connecting with an anchor provided to a spot slightly separated from a side exposed to a high water level of the cut-off plate from the neighborhood of the top section of the cut-off plate in a standing-up state or on a rope. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to water-stopping facilities such as retractable breakwaters, seawalls, and sluices provided in preparation for abnormal water level rise.

The area around the Japanese archipelago belongs to an area where earthquakes are very frequent, and is often attacked by tsunamis caused by earthquakes with the ocean floor as the epicenter. In addition, storm surges, mainly caused by typhoon pressure drop and blowing winds, may be affected. While the Japanese archipelago is thought to be approaching a period of high seismic activity, there is concern that global warming will not stop and storm surge damage will increase. There are many differences between tsunamis and storm surges if compared in detail, but for coastal areas in Japan it is necessary to consider that the high water level caused by the tsunami exceeds the high water level caused by the storm surge because of disaster prevention. It can be said that the facility also serves as a water stop facility for storm surges. In the following, unless otherwise specified, the term “tsunami etc.” is used to include storm surges.

In order to prevent damage from tsunamis and storm surges, it is effective to install water-stopping facilities such as dikes and sluices that can withstand tsunamis and storm surges along the coast. However, conventional water-stop facilities are designed to withstand the impact of tsunami by making the water-stop facilities such as breakwaters large, heavy, and solid, so there is a large amount of concrete, debris, metal, etc. Construction had to be done using materials, and construction required a long period of time and a large amount of construction costs. The adverse effects on the natural environment and fisheries were serious and not desirable from the viewpoint of the landscape. In addition, in order to minimize the obstacles to the navigation and water flow of the ship, it was necessary to open the water channel, and it was not possible to construct a perfect water stop facility for disaster prevention.

For this reason, in order to solve the above-mentioned problems, water-stopping facilities using sac bodies and membrane-like members, etc., and water-stopping facilities such as a form in which retractable water-stopping plates are deployed have been proposed. Compared to facilities constructed using a large amount of concrete, debris, metal, etc., the water stop facility is lighter and more flexible. Except for the system that accepts only at the base of the water, each part of the water-stopping facility is anchored by a method of providing anchors at appropriate locations on the seabed or land.

Major parts of the water-stopping facility, because heavy loads are applied to the water-stopping plates, water-stopping piles, water-stopping membranes, and sac of water-stopping facilities that are exposed to high water levels when a tsunami strikes. The water stop plate, water stop pile, water stop film, and sac constituting the body are displaced and the function of the water stop facility is impaired. For this reason, it was difficult to construct a retractable water stop facility with a large closable width that could prevent a tsunami with a large wave height from entering.
JP 09-273130 A JP2003-342938 JP2004-1000023 JP 2004-116130 A JP 2005-105775 A JP-A-2005-207220 Masahiko Oya et al. “Knowing and Preventing Natural Disasters” Kokon Shoin 1996 Nikkei Sangyo Shimbun article (listed on page 17 of October 5, 2005)

The problem to be solved by the invention is that water-stop facilities using water-stop plates, water-stop piles, water-stop membranes, and sac bodies receive large loads due to high water levels and flow impacts caused by tsunamis and storm surges, and low By solving the problem of being pushed down to the land side, which is the water level side, it is possible to prevent the entry of tsunamis with large wave heights and to realize a retractable water stop facility with a large width that can be closed. It is to expand the area that can be protected by construction.

In order to achieve the above-mentioned object, the present invention provides a length that can secure at least a height that is at least equal to the height of the standing water stop plate in a water stop facility of the type in which the standing water stop plate is erected. A fulcrum is provided near the end of the arm, and a fulcrum is also provided near the base of the standing waterstop, and this is combined with the fulcrum on the arm to attach the arm freely, and from the swing fulcrum of the arm An anchor provided in the vicinity of the distant end, and provided at a point slightly apart on the side exposed to the high water level of the water stop plate from the vicinity of the top of the standing water stop plate. It is set as the water stop facility provided with the water stop board standing posture holding mechanism of the structure connected to the chain | strand or the rope.

In addition, in a water stop facility of the type that makes steel pipe water stop piles that are levitated by buoyancy, a fulcrum is provided at least near the end of the brace that exceeds the height of the water stop pile that is levitated from the sea floor. A fulcrum is also provided near the bottom of the waterstop pile, and this is combined with a fulcrum on the arm to attach the arm so that it can swing freely, and a connecting part is provided near the end away from the arm sway. A structure in which the connecting part provided on the arm is connected to a chain or a rope that connects the anchor provided at a slightly distant point on the side exposed to the high water level of the water-stopping pile from the vicinity of the top of the floating water-stopping pile The water stop facility is equipped with a standing posture maintenance mechanism.

In a water stop facility of the type that deploys a flexible water stop film, a fulcrum is provided near the end of the arm tree that is at least as high as the height of the water stop plate in the deployed state. A fulcrum is also provided near the base of the water curtain, and this is combined with a fulcrum on the arm and the arm is swingably attached, and a connecting part is provided near the end away from the swing fulcrum of the arm. The water stop that is attached to the chain or rope that connects the anchor provided at the top of the water stop membrane in the unfolded state to the anchor located at a slightly distant side that is exposed to the high water level of the water stop membrane A water-stop facility equipped with a membrane standing posture holding mechanism.

In the water stop facility of the type that expands by filling the sac with fluid and expanding it, a fulcrum is provided near the end of the arm tree with a length that can secure at least a height equal to the height of the sac in the expanded state, A fulcrum is also provided in the vicinity of the base of the capsular body in the deployed state, and this is combined with a fulcrum on the arm and the arm is swingably attached, and a connecting part is provided near the end away from the swing fulcrum of the arm, A sac body in which the joint part provided on this arm is attached to a chain or rope that connects the anchor provided at a slightly distant point on the side exposed to the high water level of the sac body from the vicinity of the top of the sac body in the expanded state The water stop facility is equipped with a standing posture maintenance mechanism.

In a water stop facility of the type that attaches a floating body to a flexible water stop film and deploys the water stop film by the buoyancy of the floating body, it is at least equal to the height of the floating body added to the height of the water stop curtain in the deployed state A fulcrum is provided near the end of the arm that is long enough to secure the height, and a fulcrum is also provided near the base of the deployed stationary curtain, and this is combined with the fulcrum on the arm to attach the arm freely. A connecting part is provided in the vicinity of the end away from the swing support point of the arm tree, and the connecting part provided on the arm tree is slightly separated from the vicinity of the top of the floating body in the unfolded state and exposed to the high water level of the water blocking film. The water stop facility is provided with a standing posture holding mechanism for a water stop film attached to a chain or a rope that connects to an anchor provided at a certain point.

The water stopping facility provided with the standing posture holding mechanism of the present invention solves the problem that the water stopping facility tends to be pushed down to the land side that is the low water level side, and increases the stability of the water stopping facility, thereby increasing the wave height. A retractable water stoppage facility that can prevent tsunamis from entering and has a large width that can be closed. In addition, it was possible to prevent the entry of tsunamis with large wave heights, which had been difficult in the past, and realized a retractable water stop facility with a large width that can be closed. Expanded.

The best mode for carrying out the present invention will be described with reference to the drawings. In the following explanation, the term “offshore” is used for the side receiving the high water level that is approached by the tsunami against the waterstop facility, and the term “land” is used for the opposite side.

FIG. 1 is a cross-sectional view of a water stop facility of a type in which a swing standing water stop plate according to claim 1 of the present invention is set up. The figure shows a state where the swing standing water stop plate 1 of the water stop facility is blocking the high water level 24, and the left side of the figure is the offshore side. The water stop facility shown in the figure is provided with a fulcrum 4 in the vicinity of the end 3 of the arm 2 having a length that can secure at least a height equal to the height of the water stop plate in the standing state, and in the vicinity of the base 5 of the water stop plate in the standing state. Also, a fulcrum 6 is provided, and this is combined with a fulcrum on the arm and the arm is swingably attached, and a connecting portion 8 is provided near the end 7 away from the swing fulcrum of the arm, and the connection provided on this arm Standing posture of a water stop plate attached on a chain or rope 13 that connects an anchor 12 provided at a point 11 slightly off the water stop plate 10 from the top vicinity 9 of the water stop plate in a standing state. A holding mechanism is provided. In addition, “slightly off-shore point” refers to a point on the offshore side immediately below the brace connecting part at the time of standing the waterstop, but toward the offshore side, the effect and economics, Considering the error when installing the anchor and the expansion or contraction of the chain or rope, it is a point that naturally becomes a limited range.

Figure 1 shows a tsunami breakwater constructed offshore as an example of a waterstop facility that can be retracted in the event of an abnormality accompanied by a rise in water level. The same structure can be applied to the tsunami sluice gate. Also, in the figure, the arm is an independent bar-shaped member, but for example, by combining a plurality of arms in a ladder shape and laying down side by side, the impact on the arms can be distributed to the plurality of arms, and the stability of the arms itself It is also possible to make it easier to obtain. Since the anchor must receive the main part of the impact received by the water stopping facility, it is necessary to prepare an appropriate one for the impact. Needless to say, sufficient fixation procedures are necessary. In the figure, the swing fulcrum provided on the arm and the swing fulcrum of the water stop plate are coaxial.

FIG. 11 is a cross-sectional view of a water stop facility of the type in which a swing standing type water stop plate is set up like FIG. 1, but unlike the present invention, it does not have a water stop plate standing posture holding mechanism. is there. In this case, an anchor provided at a point slightly off the offshore side 10 of the water stop plate from the line 14 connecting the rocking fulcrum of the water stop plate and the connection point near the top of the water stop plate and the vicinity 9 of the water stop plate. The angle 15 formed by the line connecting 12 is small, and the load applied to the chain connecting the top portion 9 of the waterstop plate and the anchor 12 or the rope 13 or the anchor itself is large. This load is known to have a minimum value at 90 degrees, but in FIG. 1, the load applied to the chain, the rope 13 or the anchor itself can be reduced by taking this angle large. Further, in FIGS. 1 and 11, the swing fulcrum of the water stop plate and the vertical position of the anchor are the same, but since the depth usually increases toward the offshore side, The angle between the line 14 connecting the connection point near the top of the water stop plate and the anchor 12 provided at a point slightly off the water stop plate 10 from the top 9 near the water stop plate becomes smaller and smaller. Although the load applied to the chain or rope 13 or the anchor itself increases, the one shown in FIG. 1 can absorb the shock applied to the chain or the rope 13 or the anchor itself by converting it into the compression direction of the brace (arrow direction 16 in the figure). In addition, when the swing fulcrum provided on the brace and the swing fulcrum of the water stop plate are coaxially connected or firmly connected to each other, the arrow is a force that pushes down the water stop facility. The water stop facility has no water stop plate standing posture holding mechanism Stable compared to the water facility is greatly increased.

FIG. 2 is a cross-sectional view of a water stop facility of the type in which the swing standing type water stop plate according to claim 1 of the present invention is set up. The figure shows a state where the swinging standing water stop plate 1 of the water stop facility is folded during a normal time, and the left side of the figure is the offshore side 10. In the water stop facility shown in the figure, the arm 2 is stored between the water stop plate on the side of the water stop plate, but it may be placed below the water stop plate to be folded or on the offshore side.

FIG. 3 is a cross-sectional view of a water stop facility of a type in which a steel pipe water stop pile 17 is levitated by buoyancy according to claim 2 of the present invention. In the figure, the steel pipe still water pile of the water stop facility is blocking the high water level 24, and the left side of the figure is the offshore side. In the water stop facility of the type in which a steel pipe water stop pile that is levitated by the buoyancy in FIG. 3 is provided, a fulcrum 4 is provided in the vicinity of the end of the arm 2 having a length exceeding at least the height of the water stop pile floating from the sea floor 18. A supporting point is also provided near the bottom of the water-stopped pile in the floating state, and this is combined with the supporting point on the arm and the arm is swingably attached, and the connecting part is near the end away from the swinging supporting point of the arm A chain or a rope 13 connecting the anchor provided on the arm to the anchor 12 provided at a slightly distant point on the side exposed to the high water level of the water-stopping pile from the vicinity of the top of the water-stopping pile in the floating state. It has a water-stopping pile standing posture holding mechanism configured to be attached to the top.

The example shown in Fig. 3 is a tsunami breakwater constructed in the offshore sea as an example of a water-stop facility constructed of steel pipe water-stop piles that float by buoyancy in the event of an abnormal water level rise. The same structure can be applied to the seawall and tsunami sluice provided. Also, in the figure, the arm is an independent bar-shaped member, but for example, by combining a plurality of arms in a ladder shape and laying down side by side, the impact on the arms can be distributed to the plurality of arms, and the stability of the arms itself It is also possible to make it easier to obtain. Since the anchor must receive the main part of the impact received by the water stopping facility, it is necessary to prepare a suitable one for the impact, and against the impact applied to the bottom of the water stopping pile near the bottom of the water stopping pile. Needless to say, sufficient fixation procedures are necessary. In the figure, the swing fulcrum provided on the arm is provided at the upper end of the water stop pile outer cylinder 19 near the base of the water stop pile, but if the shock acting on the swing support point of the arm can be received, the vicinity You may provide in other places.

FIG. 12 is a cross-sectional view of a water stop facility of a type in which a steel pipe water stop pile 17 that is lifted by buoyancy in the event of an abnormality is formed as in FIG. 3, but unlike the present invention, the water stop pile standing posture holding mechanism It does not have In this case, since the large force which pushes down the water stop pile to the land side acts on the water stop pile which receives the high water level 24, the water stop pile is displaced as shown in the figure, and the outside of the water stop pile An excessive force concentrates on the upper part of the tube 19. In the case of FIG. 12, in order to avoid the displacement of the water stop pile and excessive force concentrated on the top of the water stop pile outer cylinder, the thickness of the water stop pile or the water stop pile outer cylinder upper part is increased to increase the strength, It is necessary to take a lot of overlapping parts between the outer pile and the pile at the time of ascent. As a result, there is a disadvantage that the construction cost increases due to the problem that the floating height of the water-stopping pile cannot be increased and the use of a thick material for the water-stopping facility. In the water stop facility of the present invention shown in Fig. 1, the water stop pile standing posture holding mechanism will receive the impact caused by the tsunami, etc., so that the amount of floating of the water stop pile can be increased and the water stop can be stopped without sacrificing the strength. The thickness of the water pile and the outer cylinder of the water-stop pile can be reduced, and there is an advantage that a water-stop facility in the form of a water-stop pile can be economically constructed so that the floating height of the water-stop pile can be increased.

In order to provide a water stop facility of a type that raises a steel pipe water stop pile that floats by buoyancy in the event of an abnormality, as shown in FIG. 4, the water stop pile outer cylinder 19 protrudes from the seabed, The mound 20 is provided in a shape to cover the part, and the strength of the water-stopping pile 17 is increased even when a long steel pipe water-stopping pile is used by providing a water-stopping facility equipped with the water-stopping pile standing posture holding mechanism of the present invention. It can be secured sufficiently. Conventionally, it has been considered difficult to install a water stop facility at a deep point, but this enables construction and shortens the construction period because excavation work associated with the installation of the water stop facility can be reduced. The advantage of being able to do so was born.

FIG. 5 is a cross-sectional view of a water stop facility of the type in which the flexible water stop film 21 according to claim 3 of the present invention is developed. The figure shows a state where the flexible water stop film of the water stop facility is blocking the high water level 24, and the left side of the figure is the offshore side. In the water stop facility shown in the figure, a fulcrum 4 is provided in the vicinity of the end of the arm 2 having a length that can secure at least a height equal to the height of the water stop curtain in the unfolded state. A fulcrum 6 is provided, and this is combined with a fulcrum on the brace so that the brace can be swingably mounted, and a connecting part is provided near the end away from the swinging fulcrum of the brace. There is provided a standing posture holding mechanism for the water curtain attached to a chain or a rope 13 that is connected to an anchor 12 provided at a position slightly off the water curtain from the vicinity of the top of the deployed water curtain. .

FIG. 6 is a cross-sectional view of a water stop facility of a type that expands by filling the bladder 22 with fluid and inflating it according to claim 4 of the present invention. The figure shows a state in which the sac of the water stop facility is blocking the high water level 24, and the left side of the figure is the offshore side. In the water stop facility shown in the figure, a fulcrum 4 is provided in the vicinity of the end of the arm 2 having a length that can secure at least a height equal to the height of the capsular body in the expanded state, and the fulcrum 6 is also provided in the vicinity of the base portion of the capsular body in the expanded state. This is combined with a fulcrum on the arm, and the arm is swingably attached, and a connecting part is provided near the end away from the swinging fulcrum of the arm, and the connecting part provided on the arm is in a deployed state. The sac body has an upright posture holding mechanism that is connected to a chain or rope 13 that connects to an anchor 12 provided at a point slightly off the sac from the top of the sac.

FIG. 7 is a cross-sectional view of a water stop facility of a type in which a floating body 23 is attached to the flexible water stop film 21 according to claim 5 of the present invention, and the water stop film is developed by the buoyancy of the floating body. . The figure shows a state where a flexible water-stopping film to which a floating body of a water-stopping facility is attached blocks the high water level 24, and the left side of the figure is the offshore side. The water stop facility shown in the figure is provided with a fulcrum 4 near the end of the arm 2 having a length that can secure at least a height equal to the height of the floating body added to the height of the water curtain in the deployed state. A fulcrum 6 is also provided near the base of the water curtain, and this is combined with a fulcrum on the arm to attach the arm so that it can swing freely, and a connecting part is provided near the end away from the swing fulcrum of the arm, The connecting part provided on the brace is attached on the chain or rope 13 connecting the anchor 12 provided at a point slightly off the water curtain from the vicinity of the top of the incidental attached to the upper part of the deployed water curtain. Equipped with a standing posture holding mechanism for the water curtain.

FIG. 5 shows a water-stop facility of the type in which the flexible water-stop film according to claim 3 of the present invention is deployed, and the sac body according to claim 4 of the present invention is filled with fluid. FIG. 6 showing a water stop facility of a type that expands by expanding, and a floating body attached to the flexible water stop film according to claim 5 of the present invention, and the water stop film is developed by the buoyancy of the float 7 in which the water stop facility of the type which performs is pushed down to the land side where the water stop facility becomes the low water level side 25 by the high water level 24 such as a tsunami, The sac is pulled upward by the standing posture holding mechanism, and the height of the water curtain and sac that receive the high water level from the offshore side is always maintained. These water-stopping facilities and water-stopping facilities using sac bodies can also be installed at deep water points where construction was impossible in the past, as shown in FIG. As shown by 9, it can also be adopted at points where the water depth increases toward the offshore side 10.

  FIG. 10 is a perspective view of one embodiment of the water stop facility of the present invention. The tsunami breakwater shown in the figure is erected by the water flow at the tip of the tsunami, and hits the high water level 24 due to the tsunami from the left side of the figure. Inflow of high water level to the land side is blocked. Further, during normal times, the waterstop plate 1 is stored in a sloping manner as shown in FIG. 2 so that the tidal current and navigation of the ship are not hindered. The number of anchors and chains or ropes that are connected to the offshore side will be appropriately increased or decreased depending on the power of the expected tsunami and the situation of the installation site, and the length, weight, Make the shape suitable.

The water stop facility of the present invention can be applied as a tsunami sluice gate provided at a tsunami breakwater or a river mouth in addition to a tsunami breakwater, and also as a disaster prevention facility against storm surges.

FIG. 3 is a cross-sectional view of the water stop facility according to claim 1 of the present invention when the water stop plate stands. FIG. 3 is a cross-sectional view of the water stop facility according to claim 1 of the present invention when the water stop plate is stored. It is sectional drawing at the time of the still water pile floating of the still water facility of Claim 2 of this invention. It is sectional drawing at the time of a water stop pile rising of the water stop facility of Claim 2 of this invention what made the water stop pile outer cylinder protrude from a seabed, and provided the mound in the form which covers a protrusion part. It is sectional drawing at the time of the water stop curtain expansion | deployment of the water stop facility of Claim 3 of this invention. It is sectional drawing at the time of the capsule expansion | deployment of the water stop facility of Claim 4 of this invention. It is sectional drawing at the time of the water stop curtain expansion | deployment of the water stop facility of Claim 5 of this invention. It is sectional drawing at the time of a water curtain deployment of what provided the mound in the water stop facility of this invention. It is sectional drawing at the time of the expansion | deployment which installed the water stop facility of this invention in the point of the deep water depth. It is a perspective view at the time of expansion | deployment installed in the point with the large width which should close the water stop facility of this invention. It is sectional drawing at the time of the water stop board expansion | deployment of the water stop facility which does not have a standing posture maintenance mechanism. It is sectional drawing at the time of the water stop pile floating of the water stop facility which does not have a standing posture maintenance mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water stop plate 2 Arm 3 End part of arm 4 Arm support 4 Standing water base 6 Standing near the base 7 End away from the swinging arm 8 Joint 9 Water stop 10 offshore side 11 offshore side 12 anchor 13 chain or rope 14 line connecting the rocking fulcrum of the waterstop and the connecting point near the top of the waterstop 15 arrow indicating the angle 16 Arrows indicating the force in the compression direction 17 Steel pipe still water pile 18 Sea bottom 19 Water stop pile outer cylinder 20 Mound 21 Flexible water stop curtain 22 Pouch 23 Floating body 24 Water surface at high water level 25 Water surface at low water level

Claims (5)

In a water stop facility of the type that stands a rocking standing water stop plate, a fulcrum is provided in the vicinity of the end of the arm tree with a length that can secure at least a height equal to the height of the water stop plate in the standing state. A fulcrum is also provided near the base of the water stop plate, and this is combined with a fulcrum on the arm, so that the arm can be swingably attached, and a connecting portion is provided near the end away from the swing fulcrum of the arm. The connecting part provided on the chain is connected to the anchor on the side of the standing water stop plate from the vicinity of the high water level of the water stop plate, or to the anchor on the side of the rope. Water stop facility with a water stop plate standing posture holding mechanism. In a water-stop facility of the type of standing steel pipe water-stop piles that are levitated by buoyancy, a fulcrum is provided at least near the end of the brace that exceeds the height of the water-stop pile in the floating state from the seabed, A fulcrum is also provided near the base of the pile, and this is combined with a fulcrum on the arm so that the arm can swing freely, and a connecting part is provided near the end away from the swing fulcrum of the arm, and this arm is provided. Still water with a structure that connects the anchored part to a chain or a rope connecting the anchor provided at a slightly distant point on the side exposed to the high water level of the still water pile from the vicinity of the top of the standing still water pile A water stop facility with a pile standing posture retention mechanism. In a water-stop facility of the type that deploys a flexible water-stop film, a fulcrum is provided near the end of the arm tree that is at least as high as the height of the standing water curtain, and A fulcrum is also provided near the base of the water curtain, and this is combined with a fulcrum on the arm and the arm is swingably attached, and a connecting portion is provided near the end away from the swing fulcrum of the arm. A waterproofing membrane in which the provided connecting part is attached to a chain or rope that connects an anchor provided at a slightly distant point on the side exposed to the high water level of the waterproofing film from near the top of the deployed waterproofing film. Water stop facility with a standing posture maintenance mechanism. In a water stop facility of the type that expands by filling the sac with fluid and expanding, a fulcrum is provided near the end of the arm tree that is at least as long as the height of the sac in the expanded state. A fulcrum is also provided near the base of the capsular body in a state, and this is combined with a fulcrum on the arm and the arm is swingably attached, and a connecting part is provided near the end away from the swing fulcrum of the arm. The sac of the sac that is attached to the chain or rope that connects the anchors provided on the arms to the anchors provided at a slightly distant point on the side exposed to the high water level of the sac from the vicinity of the top of the sac in the expanded state A water stop facility with a standing posture holding mechanism. In a water-stop facility where a floating body is attached to a flexible waterproof film and the waterproof film is deployed by the buoyancy of the floating body, at least the height equal to the height of the floating body added to the height of the deployed waterproofing curtain A fulcrum is provided in the vicinity of the end of the arm tree with a length that can be secured, a fulcrum is also provided near the standing base of the standing curtain, and this is combined with the fulcrum on the arm tree so that the arm tree can be swung freely. A connecting part is provided near the end away from the swinging fulcrum of the arm, and the connecting part provided on this arm is slightly separated from the top of the unfolded floating body to the side exposed to the high water level of the water blocking film. A water stop facility with a standing posture holding mechanism for a water stop film attached to a chain or a rope connecting an anchor provided at a point.