JPH034686B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to sandbags filled with super absorbent resin.

Generally, sandbags are used as an emergency measure to prevent disasters such as the failure or overflow of river embankments due to floods, the intrusion of inflowing earth and sand, and the collapse of embankments and slopes due to rainwater. A bag of the same strength and size is manually filled with earth and sand (mainly sand), and the bag is closed by tightly tying the inlet.

Conventional sandbags are constructed as described above, and during normal times, only the bags are prepared, and when a disaster such as the one described above is predicted or occurs, the bags are rushed to the disaster area and are used to protect the area from devastation. Under poor weather conditions, bags are filled with sand, the input port is closed, and the sandbags are piled up.

[Problems to be solved by the invention] In the conventional sandbags described above, the bags are manually filled with soil and sand, the input port is closed, and the sandbags are formed under the poor conditions of disaster areas. In terms of securing manpower and procuring large amounts of soil, it is difficult to make a large number of sandbags in a short period of time in a disaster area, and there are problems with the original function of sandbags, which are used for emergency prevention of disasters. Ta.

[Means for solving the problem] The sandbag according to the present invention is a bag made of a material that has a certain strength and has small holes for water to pass through, and is filled with a superabsorbent resin and earth and sand in a predetermined ratio. Sandbags made of sandbags are connected in a band shape at predetermined intervals.

In addition, a method of using a sandbag according to another invention of the present invention is to arrange the band-shaped sandbags of the present invention as described above, place a conventional sandbag filled with earth and sand on the connection part thereof, and combine the resin sandbag with the conventional sandbag in this way. It is made by stacking sandbags filled with sand in parallel.

[Function] In a normal state, the sandbag according to the present invention is made up of bags partially filled with a superabsorbent resin and connected in a band shape through a connecting portion of a predetermined width. These relatively lightweight sandbags are transported to disaster areas, filled with earth and sand, and then made to absorb water and expand into resin to form sandbags.

In addition, in another invention of the present invention, in a case where the sandbag according to the present invention and a conventional sandbag filled with earth and sand are combined and stacked, the weight of the stacked sandbag itself becomes large, and it resists water pressure etc. It becomes a stable and immovable sandbag.

[Embodiment] FIG. 1 is an explanatory diagram of a sandbag showing an embodiment of the present invention. In the figure, 1 is a sandbag;
2 is the opening of the bag 1, 3 is the side of the bag 1, and 4 is the bottom of the bag 1, which is partially filled with a super absorbent resin from the opening 2 and then temporarily closed. The dimensions of the sandbag bag 1 are usually about 25 to 30 cm at the bottom and 60 to 70 cm at the sides, and the material of the bag is permeable to water and has the strength to withstand loads from above and from the surroundings when stacked as sandbags. However, use a super absorbent resin that absorbs water and does not leak even if it gels. Therefore, any woven fabric made of natural fibers or artificial fibers that satisfies such conditions in terms of yarn and fabric structure can be used.
It can also be used by stacking thermoplastic resin sheets such as polyethylene, polypropylene, etc. and heat sealing the sides 3 and bottom 4 to form a bag. The bag is provided with holes so small that they will not leak even if the superabsorbent resin filled in the bag absorbs water and turns into a gel. The most suitable material in terms of strength is a woven fabric made of slit yarn made by slitting a stretched thermoplastic resin film or sheet such as polypropylene, which allows water to pass through well and prevents leakage of gelled superabsorbent resin. .

The amount of superabsorbent resin to be filled is determined so that the water-absorbed resin fills the empty space of the earth and sand that is put into the sandbag. For example, if the internal volume of a sandbag is V, the volume of earth and sand is V0, and the water absorption capacity of resin is A times,
The amount x of the resin satisfies x≧V−V0/A.

Naturally, if the amount of sediment V0 is increased,
The amount of resin x needs to be small, and if the amount of earth and sand V0 is made smaller, the amount of resin x will increase. When using sandbags containing this resin alone, the amount of sand should be increased to resist hydraulic water flow, and as described later, when used in combination with conventional sandbags, the amount of resin should be increased. Depending on the situation, the amount of sediment may be zero.

These sandbags are connected in a band shape at predetermined intervals as shown in FIG. In addition, when it is made into a band shape, the connection part 5 between the bags 1 and 1 may be short, but
As shown in FIG. 2, the connecting portion 5 is made long so that when stacking other sandbags, another sandbag can be placed on top of the connecting portion 5. Manufactured sandbags are in sheet form when the superabsorbent resin does not absorb water, so they can be stored by stacking them as they are, or if they are in band form, they can be stored rolled up as shown in Figure 3. .

The superabsorbent resin to be filled is structurally a slightly cross-linked electrolyte polymer with ionic groups, and absorbs hundreds to thousand times the weight of the superabsorbent resin itself. It is a polymer that can be retained, and there are synthetic and semi-synthetic products, but any of them can be used. but,
In order to be used in sandbags, the properties of superabsorbent resin such as water absorption amount, water absorption rate, gel strength, and durability must meet the usage conditions of sandbags. High speed and high gel strength are particularly required.

Examples of synthetic superabsorbent resins that satisfy these conditions include polyacrylate-based products, saponified polyacrylonitrile-based products, acrylic acid-vinyl alcohol copolymer-based products,
Semi-synthetic products include starch-acrylic acid graft polymers.

The bulk density of such a super absorbent resin before water absorption is
Although the size is about 0.4 g/cm and 0.1 mm or less, the bulk density becomes approximately 1 g/cm due to water absorption. The bulk density of the soil is approximately 1.8 g/cm.

Stacking sandbags adds weight, so they need to be strong. Therefore, when the vinyl alcohol absorbs moisture and expands in volume, the vinyl alcohol is stretched and aligned, forming a block polymer structure and creating a three-dimensional structure that resembles a crosslinking material. Super absorbent resin based on acid-vinyl alcohol copolymer is suitable for sandbags.

The band-shaped sandbags thus formed are transported to the disaster area, where they are filled with a predetermined amount of earth and sand and mixed with superabsorbent resin. Since the amount of earth and sand to be filled is smaller than that of conventional sandbags, the amount of manpower, time, and amount of earth and sand required to form the sandbags are significantly smaller than in the past.

Then, by applying water artificially or by natural rainfall, the superabsorbent resin inside the bag rapidly absorbs several hundred to 1,000 times its own amount of water and gels, forming a pillow-shaped sandbag. It is formed. Note that once the water is retained in the gelled superabsorbent resin, it becomes irreversible, so even if a load from a sandbag or the like placed above it is applied to the sandbag, the gel will not return to water and be released.

In order to use the sandbags formed as described above as sandbags on a river embankment, etc., they are placed in a predetermined location by arranging or stacking them. As for the method of stacking the sandbags, only the sandbags of the present invention may be arranged in one row or in multiple rows, but a conventional sandbag filled with earth and sand is placed on the connection part 5 of the arranged sandbags of the present invention, and the sandbags of the present invention and conventional sandbags are stacked. Sandbags may be combined and stacked in multiple layers.

FIG. 4 shows a band-shaped sandbag A of the present invention which is expanded by absorbing water, and a conventional sandbag B filled with earth and sand is placed on top of the fabric or sheet of the connection part 5. Fig. 5 shows a multi-layered stack of sandbags that is a combination of A and B above. As described above, when the sandbag A of the present invention is stacked in combination with the conventional sandbag B, the weight of the entire stack of stacked sandbags increases, which can sufficiently resist water pressure from the lateral direction and rapidly In this way, such a stack of sandbags is formed, and the function of the sandbag of the present invention is effectively exhibited.

[Effects of the Invention] The sandbag according to the present invention is made by placing a predetermined amount of super absorbent resin in a bag made of a material that has a certain height and has pores for water to pass through, and then placing the bags at predetermined intervals. It is constructed by connecting in a band shape. When using these sandbags, the band-shaped sandbags are brought to the site and filled with a predetermined amount of earth and sand, and then water is poured over them to make the resin inside the sandbags absorb and gel, and the pillow-shaped sandbags are then lined up. A conventional sandbag filled with earth and sand is placed on the connection part, and in this way, the band-shaped sandbag and the conventional sandbag filled with earth and sand are stacked and used in parallel. As a result, the following excellent effects were achieved.

(1) Pillow-shaped sandbags are formed by transporting sheet-shaped sandbags to the site, filling them with a small amount of earth and sand, and sprinkling water on them, which reduces the amount of manpower, time, and amount of soil required to form sandbags compared to conventional sandbags. Comparatively speaking, it costs less.

(2) Lighter and easier to handle than conventional sandbags.

(3) By combining and stacking the sandbags of the present invention and conventional sandbags, it is possible to construct sandbags with high strength that can resist river water pressure and the like.

[Brief explanation of drawings]

FIGS. 1 to 3 are explanatory diagrams of an embodiment of the present invention,
4 and 5 are explanatory diagrams of another embodiment of the present invention. In the figure, 1 is a sandbag bag, 2 is an inlet, 3 is a side of the bag 1, 4 is a bottom of the bag 1, and 5 is a connection part.

Claims (1)

[Scope of Claims] 1. A sandbag made of a material having a predetermined strength and water permeability and filled with a super absorbent resin and earth and sand mixed in a predetermined ratio is placed at a predetermined interval. A sandbag characterized by being constructed by opening and connecting them in the form of a band. 2. Sandbags constructed by connecting sandbags made of a material with a specified strength and water permeability and filled with highly water-absorbent resin and earth and sand in a band shape at specified intervals. A method of using sandbags, characterized by placing sandbags filled with earth and sand on the joints of the sandbags and stacking them.