JPH108433A - Temporarily constructed water cut-off structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cut-off structure which is just installed without special fixing work. SOLUTION: A temporarily constructed water cut-off structure comprises a pair of flexible bag bodies 10, 20, wherein the respective bag bodies 10 are provided with water supply and discharge openings 11, 21 and with exhaust ports 21, 22, and the opposite surfaces of the bag bodies 10, 20 are separably connected to each other by band-like members 13, 23. When a water flow (w) works on the water cut-off bag body 10, though the bag body is about to roll clockwise, it receives the force of rolling counter-clockwise to prevent rolling of the water cut-off bag body 10, because the supporting bag body 20 is connected to the member body 10 through the band-like members 13, 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure used for temporarily dividing a river or the like or stopping water.

[0002]

2. Description of the Related Art Sandbags have been used for stopping water in rivers and the like for a long time. Needless to say, the production of sandbags requires a lot of time and labor, and the workability is very poor.

[0003]

Therefore, Japanese Patent Application Laid-Open No. 56-85012 discloses a flexible membrane fixed to an inflatable and contractible bag body, and the bag body is installed on a riverbed so that the flexible membrane is attached to the riverbed. Means have been proposed for embedding or fixing with stakes or weights, and expanding by supplying fluid into the bag body to block the water.

[0004] Such a bag is easy to transport when contracted, and when laying it, it is only necessary to fix the flexible membrane connected to the bag. It is extremely cheap by comparison.

[0005] However, when the ground of the riverbed is soft, fixing is difficult, and the fixing operation itself is troublesome.

[0006] Therefore, an object of the present invention is to eliminate the fixing work and to enable water stoppage only by installation.

[0007]

[MEANS FOR SOLVING PROBLEMS] In order to solve the above-mentioned problems, first,
The waterproof structure according to the invention of the present invention employs an airtight flexible bag, and has a tubular configuration whose width when inflated is about twice the height.

[0008] An elastic sheet can be fixed to the bottom surface of the bag body.

A water-stopping structure according to a second aspect of the present invention comprises an air-tight, inflatable and contractible water-stopping bag and a supporting bag, and the surfaces facing each other in the length direction of the bag are mutually opposed. The connection configuration was adopted.

[0010] The pair of bags can be connected to be separable.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a temporary waterproof structure 1 is provided with an airtight flexible bag 2 provided with a supply / discharge port 3 for fluid (mainly water) and an exhaust port 4. In the state where the fluid is supplied from the supply / discharge port 3 and expanded, it has a cylindrical shape, a substantially elliptical cross section, and preferably a semi-cylindrical bottom. The relationship between the height H and the width W is such that the latter is about twice as large as the former, ie, W ≧ 2H.

As the material of the bag 2, a synthetic rubber sheet in which a rubberized cloth or a woven cloth is embedded can be used.
Further, if the elastic sheet 5 such as a urethane sheet is fixed to the bottom surface, the watertightness with respect to the riverbed can be improved (the flowing water does not pass), and at the same time, the grip with respect to the riverbed can be improved.

As described above, when the bag 2 is a single body, the water depth h of the water flow is about 1/2 of the height of the bag 2, that is, h ≦ １ ／ H.
The degree is the rolling limit of the bag 2, and it has been experimentally confirmed that even if the width W of the bag 2 is 2H or more, the rolling limit cannot be increased. Of course, this is the case where the bags 2 are used alone, and is different from the case where the bags 2 are arranged in a U-shape and their respective ends are connected as shown in FIG. Are not connected at the ends as will be described later). Therefore, it is possible to provide a means capable of locking only the end of the wrapper 2 or mooring it to another fixed object. For example, a rope or a band may be connected to both ends. A small piece provided with a hole to which a rope or the like can be connected may be provided at an appropriate position on the bag body 2. Note that connecting such a rope or the like is convenient even when the bag body 2 is stretched over a river or the like.

FIGS. 3 and 4 show another embodiment. As shown in the figure, the waterproof structure 1 includes a pair of large and small airtight flexible bags 10 and 20, which are connected to each other in the longitudinal direction. Of course, the supply and discharge ports 11 and 21 of the fluid and the exhaust port 1
1 and 2 are provided in the same manner as in FIG. 1 and have a cylindrical shape in a state where the fluid is supplied and expanded, and have a substantially oval cross section, but may have another shape.

The bags 10 and 20 are formed by connecting flexible band members 13 and 23 fixed to the side surfaces of the respective bags by, for example, a slide fastener 14. As a connection method, for example, as shown in FIG. 5, the eyelets provided on each of the band-shaped members 13 and 23 may be knitted with the string 14a. As described above, it is preferable that the bag bodies 10 and 20 are connected so as to be separable. However, the band members 13 and 23 may be integrated so that they cannot be separated. The connection part is a bag 10
It is preferable that the surface of the bag body 20 facing the center of the bag body 20 is opposed, and the interval between the bag bodies 10 and 20 is selected in consideration of the operation of the bag body 20 described later. The lengths of the bags 10 and 20 to be connected do not have to be the same.

An elastic sheet 15 such as urethane can be fixed to the bottom surface of the bag 10. A similar sheet may be fixed to the bag 20. This is to enhance water tightness and friction.

The bags 10 and 2 connected as described above
No. 0 is installed with the bag body 10 on the upstream side. At this time, the water flow w acts on the left side of the bag body 10 as shown in FIG. 4 and tries to roll the bag body 10 clockwise, but the bag body 20 is connected by the belt-shaped members 13 and 23. And tries to roll counterclockwise. That is, since the bag 20 tries to roll in the direction opposite to the bag 10, the bag 20 first comes into pressure contact with the downstream side surface (the surface facing the bag 20), and the bag 20 bites below it. The rolling of the bag 10 is prevented by the action of the wedge.

Accordingly, it is not necessary to make the bag 20 so large, and it is sufficient if the height of the bag 10 is about half the height of the bag 10, but of course, it may be smaller.

FIG. 6 shows an example of the usage. This example shows an example in which a part of the river A is dammed and construction is performed in the section B. The bag 20 is located inside the construction section B at right angles to the water flow, and Structures 1-1 and 1-
2 in parallel with each other, and in the same direction as the water flow, the structure 1-
Structure 1-3 for waterproofing so as to connect the ends of 1 and 1-2
Is installed. In this case, the bag body 10 is connected to the structures 1-1, 1-
The bag 20 is closely attached to the second bag 10, but a short bag 20 is connected so as not to hinder the close contact. And
If the water in section B is discharged, the riverbed will be exposed.

As described above, a rope or a band can be connected to the bags 10 and 20 or a locking means for connecting the rope or the band can be provided.

As shown in FIG. 7 and FIG.
Or, a flexible joint sheet 6 is wound around and fixed to the entire periphery of the end portion of 10, and a water-tight fastener 7 is attached to the edge so that a plurality of bags 2 or 10 can be connected in the length direction. Is also good.

[0023]

As described above, according to the first aspect of the present invention, the width of the flexible bag is set to be about twice the height of the flexible bag, so that the bag can be rolled by itself for a certain amount of water flow. Therefore, means for fixing the bag body is not required, and the workability of installation is remarkably improved.

According to the second aspect of the present invention, since the pair of large and small bags are connected in the longitudinal direction, the supporting bag tends to roll in the opposite direction to the waterproof bag receiving the flowing water. As a result, the water-stopping bag is prevented from rolling, and the work of fixing the bag to the riverbed becomes unnecessary, and the installation workability is excellent. In addition, since two bags are installed adjacent to each other, the water-stopping bag is installed. High effect.

[Brief description of the drawings]

FIG. 1 is a perspective view of a structure showing an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a plan view of a structure showing another embodiment of the present invention.

FIG. 4 is a front view of the above.

FIG. 5 is an enlarged plan view showing a connection portion between a pair of bag bodies.

FIG. 6 is a plan view showing an installation example.

FIG. 7 is a perspective view showing connection means at an end of the bag body.

FIG. 8 is a front view showing a state where the bags are connected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1-1, 1-2, 1-3 Water stop structure 2 Flexible bag 3 Supply / discharge port 4 Exhaust port 5 Elastic sheet 6 Joint sheet 7 Watertight fastener 10 Flexible bag 11 Supply / discharge port DESCRIPTION OF SYMBOLS 12 Exhaust port 13 Flexible band member 14 Slide fastener 14a String 15 Elastic sheet 20 Flexible bag 21 Supply / discharge port 22 Exhaust port 23 Flexible band member A River B Construction section H Height h Water depth W Width w Water flow

Claims (4)

[Claims] 1. A temporary water-stop structure having a tubular shape, which is made of an air-tight flexible bag and whose width when inflated is about twice its height. 2. The temporary waterproof structure according to claim 1, wherein an elastic sheet is fixed to a bottom surface of the bag body. 3. A temporary water-stop structure comprising a pair of airtight, inflatable and contractible bags, the surfaces of which are opposed to each other in the longitudinal direction thereof being connected to each other. 4. The temporary waterproof structure according to claim 3, wherein the pair of bags are connected so as to be separable.