JP2005256279A - Sandbag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sandbag which is easy to construct and less environmentally destructive. <P>SOLUTION: The sandbag is made up of an outer bag 2 formed by sewing foundation cloth like a bag, an inner bag 3 formed of an impermeable biodegradable sheet into the form of a hermetically sealed bag, and housed in the outer bag 2, a high water-absorbing material 6 formed of a high water-absorbing polymer, and housed in the inner bag 3, a water feeding port 4 from which water is fed into the inner bag 3, and air vent holes 4b formed in the water feeding port 4, for discharging air in the inner gab 3 to the outside. By virtue of this formation, a number of the sandbags can be produced in a short period of time only by feeding water into the inner bag in the field, and the sandbags are broken up by biodegradation due to secular change under the natural environment even if they are left after use thereof, which eliminates a fear of environment destruction even if they are not recovered. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sandbag that is easy to construct and has little damage to the environment.

Conventionally, a waterproof wall was constructed at the site where the flood occurred, and the tarpaulins provided to prevent the slopes and piles of sand that were being built from collapsing due to rainwater, etc. were fixed so that they would not be blown by the wind. Sandbags are used for this purpose, and many of these sandbags are manufactured by filling earth-and-sand at a construction site in a bag-like material made of natural materials such as hemp or scientific product materials.
Recently, a sandbag substitute using a superabsorbent polymer has been proposed (for example, Patent Document 1).

The sandbag substitute described in Patent Document 1 is a bag-like material in which a gel material made of a powdery or granular superabsorbent polymer is encapsulated in a bag-like material formed of a water-permeable resin sheet. It is configured to obtain a sandbag substitute that can be used as a sandbag by allowing the gel material to absorb water sprayed from the outside and gel the gel material in the bag.
JP 2003-82633 A

However, sandbags made by filling bags with earth and sand at the construction site require a lot of time and effort to seal the openings so that earth and sand do not leak after filling the bags with earth and sand. Therefore, there is a problem that sandbags are not made in time for floods that require an emergency, resulting in an increase in flood damage.
In addition, the sandbags made by filling the bag-like material with earth and sand weigh about 20kg, so when building a water barrier by stacking many sandbags, it takes a lot of time and labor, and the construction efficiency is poor. There is also a problem.
Furthermore, in order to prevent the slope from collapsing during construction, sandbags are piled up on the slope as a retaining ring, or in the case of sandbags that are fixed so that the waterproof sheet covering the slope and piled earth and sand does not fly away with the wind It is difficult to work because you have to climb a slope or a pile of sand and sand with a sandbag, and the sandbag used for the water barrier, a sandbag piled up to prevent the slope from collapsing, or waterproof The sandbag used to prevent the sheet from flying in the wind needs to be collected after use, so it takes a lot of time and labor for the collection work, and the bag is made of a chemical product material. In the case of existing sandbags, if they are left without being collected, there are problems such as causing environmental destruction.

On the other hand, sandbags using superabsorbent polymer polymers as gel materials are light before the gel material absorbs water, so there are few problems like sandbags made by filling bags with earth and sand at the construction site. In addition, the function as a sandbag can be maintained in places where the gel material is constantly immersed in water, such as a water barrier, but, for example, a pile of sandbags or slopes to prevent the slope during construction from collapsing. In the case of a sandbag that is fixed so that the covered waterproof sheet does not fly away with the wind, as the moisture absorbed in the gel material evaporates, the weight decreases and the function as a sandbag decreases, so it cannot be used for a long period of time. There's a problem.
In addition, since the gel material made of the highly water-absorbing polymer is made into an aqueous solution by salt, the gel material that absorbs water from the outside of the bag-like material as described in Patent Document 1 prevents seawater. When used as a sandbag, the gel material becomes an aqueous solution due to salinity in the seawater and is washed away from the bag-like material, so that the function as a sandbag cannot be obtained, and flooding due to melted snow generated in snowy areas etc. In this case, if salt that has been sprayed in large quantities to melt the snow is mixed in the melted water, the gel material will become an aqueous solution due to the salt content in the thawed water as in the case of seawater, and will be washed away from the bag. There are problems such as not being able to obtain the functions of

  The present invention has been made to improve such conventional problems, and an object of the present invention is to provide a sandbag that is easy to construct and has little damage to the environment.

  The sandbag of the present invention is formed in a bag shape of a sealed structure with an outer bag formed by sewing a base fabric made of a natural material into a bag shape, and a water-impermeable biodegradable sheet, and in the outer bag. An inner bag accommodated, a superabsorbent material made of a superabsorbent polymer polymer accommodated in the inner bag, a water inlet for injecting water into the inner bag, and a water inlet provided in the inner bag, It is comprised from the air vent hole which discharges | emits air.

With the above configuration, a large amount of sandbags can be produced in a short time by pouring water into the inner bag of the sandbag body at the construction site where the water blocking wall is constructed. In the case of sandbags that can be kept to a minimum, and the waterproof sheet covering the slopes and sediments is fixed so that they do not fly by the wind to prevent the slopes and piles of sand and sand from collapsing due to rain, etc. Since the sandbag body is transported to the seat fixing position without pouring water, and the inner bag is poured into the inner bag at the fixing position, the sandbag can be transported without requiring any effort even on slopes. It is not necessary to carry out hard work such as climbing the slope with a heavy sandbag.
In addition, when water is poured into the inner bag, air accumulated in the inner bag is not discharged from the air vent hole and remains in the inner bag, so that the weight of the sandbag is insufficient or the sandbag collapses due to the elasticity of the remaining air. Since it does not become easy and the moisture in the inner bag does not evaporate even if it is used for a long time, the function as a sandbag does not deteriorate, and it also stops flooding caused by seawater and snowmelt water. Even when used as a water wall, the function as a sandbag does not deteriorate because seawater and snowmelt do not enter the inner bag.
Moreover, outer bags made of natural materials and inner bags made of biodegradable sheets are less likely to generate pollutants when incinerated. Because it returns, there is little fear of destroying the environment even if it is not collected.

  The sandbag of the present invention is formed in a bag shape of a sealed structure with an outer bag formed by sewing a base fabric made of a natural material into a bag shape, and a water-impermeable biodegradable sheet, and in the outer bag. It is comprised from the accommodated inner bag, the highly water-absorbing material which consists of a highly water-absorbing polymer polymer accommodated in the inner bag, and the water inlet which inject | pours water into an inner bag.

With the above configuration, a large amount of sandbags can be produced in a short time by pouring water into the inner bag of the sandbag body at the construction site where the water blocking wall is constructed. In the case of sandbags that can be kept to a minimum, and the waterproof sheet covering the slopes and sediments is fixed so that they do not fly by the wind to prevent the slopes and piles of sand and sand from collapsing due to rain, etc. Since the sandbag body is transported to the seat fixing position without pouring water, and the inner bag is poured into the inner bag at the fixing position, the sandbag can be transported without requiring any effort even on slopes. It is not necessary to carry out hard work such as climbing the slope with a heavy sandbag.
In addition, since the water in the inner bag does not evaporate even if it is used for a long time, the function as a sandbag does not deteriorate, and the outer bag made of natural materials and the inner bag made of biodegradable sheet are incinerated. Even if it is disposed of, there is little generation of pollutants, and even if it is left as it is, it decomposes and returns to the soil in the natural environment over time, so there is little fear of destroying the environment even if it is not collected.

  The sandbag of the present invention is provided with an annular handle or handle hole used for transporting the sandbag body to the outer bag or connecting the sandbag bodies.

  With the above configuration, the sandbags can be easily transported and stacked, and a stronger water blocking wall and the like can be obtained by connecting the sandbags using a handle and a handle hole.

According to the sandbag of the present invention, a large amount of sandbag can be produced in a short time by pouring water into the inner bag of the sandbag body at the construction site, and when the water is poured into the inner bag, the air accumulated in the inner bag The sandbag is not discharged from the air vent hole and remains in the inner bag. Therefore, the weight of the sandbag is not insufficient, and the elasticity of the remaining air does not easily cause the sandbag to collapse. Since the water in the bag does not evaporate, the function as a sandbag does not deteriorate.
In addition, outer bags made of natural materials and inner bags made of biodegradable sheets are less likely to generate pollutants even if incinerated, and even if left untreated, they decompose in the natural environment after aging and become soil. Because it returns, there is little fear of destroying the environment even if it is not collected.

A first embodiment of the present invention will be described in detail with reference to the drawings.
1 is a plan view of a sandbag, FIG. 2 is a plan view of the same part, FIG. 3 is a sectional view taken along the line AA in FIG. 1, FIG. 4 is a sectional view taken along the line BB in FIG. FIG. 6 is a sectional view taken along the line CC of FIG. 5, and FIGS. 7 and 8 are explanatory views of modifications.
A sandbag body 1 shown in FIGS. 1 and 2 includes a rectangular outer bag 2 made of a natural material and an impermeable inner bag 3 made of a biodegradable material.
The outer bag 2 is made by cutting a single base fabric made of natural material such as hemp or cotton into a rectangular shape and folding it in two so as to overlap each other, or overlaying two woven fabrics that have been cut into a rectangular shape in advance. In addition, the periphery is sewn with a sewing machine or the like, and is sewn in a bag shape. The seam 2a is sewn on the entire circumference except for a part of the upper left corner portion from which the water injection port 4 protrudes.
When one woven fabric is folded in half, the sewing of the side that becomes the fold may be omitted.

A handle 5 is provided at the upper side corner of the outer bag 2 by sewing a string-like object in an annular shape, and the handle 4 carries the sandbag body 1 and connects the plurality of sandbag bodies 1 to each other. Etc. can be easily performed.
The inner bag 3 accommodated in the outer bag 2 of the sandbag body 1 is formed in a rectangular shape that is slightly smaller than the outer bag 2 so that the outer peripheral edge does not overlap the seam 2 a sewing the peripheral portion of the outer bag 2. In addition, before the entire circumference of the outer bag 2 is sewn, it is accommodated in the outer bag 2 in advance.
The inner bag 3 is formed of a biodegradable material that is decomposed by microorganisms and bacteria after a predetermined period, for example, one year, even when the used sandbag body 1 is left unattended.
As the biodegradable material used for the inner bag 3, an impermeable biodegradable sheet made of a biodegradable starch resin made from corn is used.

Since the biodegradable sheet made of biodegradable starch resin is thermoplastic, the entire circumference excluding the attachment portion 3a of the water inlet 4 after cutting the biodegradable sheet previously formed into a film shape into a predetermined size Is sealed with a sealing means such as heat seal, or a biodegradable sheet previously formed into a tube shape is cut into a predetermined length, and the cut portion is sealed with a sealing means such as heat seal to form a bag. ing.
The cylindrical water injection port 4 attached to the water injection port attachment part 3a of the inner bag 3 is formed by forming a biodegradable sheet of the same material as the inner bag 3 into a tube shape. As shown in FIG. 5, one end side from the water mouth attaching portion 3 a is inserted into the inner bag 3, and the other end side protruding outside the inner bag 3 is not sewn on the upper left corner of the outer bag 2. As shown in FIG.1 and FIG.2, it protrudes to the outer side of the outer bag 2 from the part 2b, and can inject water in the inner bag 3 from the front-end | tip.

The substantially intermediate portion of the water inlet 4 is hermetically welded to the inner bag 3 so that the inner peripheral surface is not in close contact with the inner bag 3 when the periphery of the inner bag 3 is sealed with a sealing means such as heat seal. One or a plurality of air vent holes 4b are formed inside the welded portion 4a of the water port 4, that is, inside the inner bag 3.
These air vent holes 4b are formed before the water injection port 4 is attached to the inner bag 3, and are provided, for example, at two locations in the circumferential direction of the water injection port 4. The water injection ports 4 are shown in FIG. As shown by the phantom line, the air vent hole 4b is blocked by the peripheral wall where the air vent hole 4b is not provided, and the water injected into the inner bag 3 is thereby removed from the air vent hole 4b. It is designed not to leak to the outside.

On the other hand, in the inner bag 3 of the sandbag main body 1, an appropriate amount of a superabsorbent 6 made of a powdery or granular superabsorbent polymer is stored in the inner bag 3 so as to have a preset expansion amount.
The superabsorbent 6 made of a superabsorbent polymer is a well-known polymer compound having a molecular structure insolubilized by increasing the crosslinking density of the water-soluble polymer, and absorbs water in a short time when contacted with water. It expands and gels the entire water. If the gelation is insufficient, the sandbag shape becomes unstable due to the fluidity of the water, so that it tends to collapse when stacked.

The high water absorption material 6 has a water absorption rate that varies depending on various conditions of water used, for example, conditions such as impurities dissolved in water and conditions such as temperature. The predetermined weight of the high water absorption material 6 is set in advance.
Specifically, for example, when the sandbag weight is 20 kg, the weight of the superabsorbent 6 that sufficiently absorbs 20 liters of water is set to a predetermined predetermined weight that can be accommodated. The weight is determined by the characteristics of the selected polymer, so it is not suitable for stacking, etc., and in places where sandbag shape stability is not required, such as construction sites close to flat ground, The water absorbing material 6 may not be included.
In addition, the form of the superabsorbent material 6 made of the superabsorbent polymer is not limited to a powder form or a granular form, and may be a scale form or a fiber form.

Next, the operation of the sandbag constructed as described above will be described.
The purpose of using sandbags is to build up a water barrier by stacking many sandbags in the event of a flood due to heavy rainfall. The tarpaulin covering the slope to prevent it from collapsing is fixed so that it does not fly with the wind, and the tarpaulin covering the earth and sand is prevented from collapsing due to rainfall. It is often used as a weight to fix so that it does not fly.

When building a water barrier with sandbags in the event of a flood, transport the unfilled sandbag body 1 to the flood site and insert a water pipe such as a hose connected to a water source such as tap water into the water inlet 4 Water is poured into the inner bag 3 of the sandbag body 1.
The water injected into the impervious inner bag 3 is almost entirely absorbed by the superabsorbent material 6 made of a superabsorbent polymer polymer previously accommodated in the inner bag 3, and the water is absorbed in the inner bag 3. As the material 6 starts to expand, the air confined in the inner bag 3 at this time is discharged to the outside of the sandbag body 1 through the air inlet 4 from the air vent 4b opened in the water inlet 4. Therefore, the superabsorbent polymer 6 is expanded to fill the inner bag 3 and air does not accumulate in the sandbag body 1.
When the sandbag body 1 expands to a predetermined size, when the water injection is stopped and the water supply pipe is pulled out from the water injection port 4, the water injection port 4 is crushed and overlapped as shown by the phantom line in FIG. Since the air vent hole 4b is closed by the inner wall without 4b and the water injection port 4 is sealed, the highly water-absorbing material 6 and water in the inner bag 3 do not leak out.

After making a large amount of sandbags as described above, the water barrier can be constructed in a short time by holding the handles 5 and stacking the sandbags in a short time. If there is a possibility that the water will be lost, a stronger water blocking wall can be constructed by connecting the handles 5 to each other.
In the case of a sandbag that is fixed so that the waterproof sheet covering the slope and the sand is not blown by the wind to prevent the slope and piled sand from collapsing due to rain, etc., the sandbag body 1 up to the fixing position of the waterproof sheet The sandbag body 1 that is not watered is light in weight, so it can be easily transported without requiring labor even on an inclined surface such as a slope. It is not necessary to carry out difficult work such as climbing slopes.
After transporting the sandbag body 1 to the fixing position of the waterproof sheet, water is poured into the inner bag 3 from the water inlet 4 to produce the sandbag. Even if there are many places where the waterproof sheet is fixed, the waterproof sheet can be fixed in a short time. Can be done.
It should be noted that the movement of the sandbag body 1 and the handle connecting the sandbag bodies 1 may be of course a handle hole formed in the outer bag 2.

On the other hand, many sandbags that became unnecessary due to the flood water were transported to a place where they would not get in the way, but the superabsorbent 6 that had absorbed water became an aqueous solution by adding salt and decomposed by ultraviolet rays. In the case of the high water-absorbing material 6 having the property, the sandbag main body 1 is simply broken and the high water-absorbing material 6 is simply left in the inner bag 3 so that it can be treated easily.
In addition, the outer bag 2 made of natural materials and the inner bag 3 made of biodegradable sheets are less likely to generate pollutants even if they are incinerated. Because it is returned to the soil, there is little concern about destroying the environment even if it is not collected.
Similarly, sandbags used for fixing tarpaulins and sandbags used to prevent landslides can be left alone and disassembled over time to return to the soil, destroying the environment without any particular recovery. There is little worry to do.

  7 and 8 show a modification of the water injection port 4 provided in the sandbag body 1, and as shown in FIG. 7, the short side corner of the sandbag body 1 is parallel to the long side. The water injection port 4 may be provided, or as shown in FIG. 8, the water injection port 4 may be provided in a substantially central portion on the short side of the sandbag body 1, and there is no particular limitation as long as it is a position where water injection is easy.

On the other hand, FIG. 9 to FIG. 11 show a second embodiment. Next, the second embodiment will be described.
The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The sandbag body 1 shown in FIGS. 9 to 11 also includes an outer bag 2 and an inner bag 3 accommodated in the outer bag 2, and the inner bag 3 has a water inlet 4 for injecting water into the inner bag 3. It is the same as that of the said 1st Embodiment that the high water absorption material 6 which is provided and the high water absorption high molecular polymer 6 is accommodated in the inner bag 3 is contained.
The only difference from the first embodiment is that the air inlet hole 4b is not formed in the water inlet 4, and almost no air is accumulated inside the sandbag body 1 that has been stored for a long time in the folded state. In this case, even if water is injected from the water injection port 4, air does not accumulate in the inner bag 3, so there is no practical problem even if the water injection port 4 does not have the air vent hole 4 b.

The inner bag 3 does not use a biodegradable sheet as the material of the inner bag 3 when it is assumed that used sandbags are collected. Material may be used.
In addition, if a material that decomposes into a material that does not cause environmental pollution, such as an acrylic acid polymer metal salt, is adopted as the material of the super absorbent material 6, there is less concern about destroying the environment even if it is not collected. When the type having the property of being decomposed by ultraviolet rays is adopted for the super absorbent material 6, the inner bag 3 may be colored to reduce the ultraviolet transmittance.

It is a top view of the sandbag which becomes the 1st Embodiment of this invention. It is the top view which notched some sandbags which become the 1st Embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is an enlarged view near the water inlet provided in the inner bag which comprises the sandbag which becomes the 1st Embodiment of this invention. It is sectional drawing which follows the CC line of FIG. It is a top view which shows the modification of the sandbag which becomes the 1st Embodiment of this invention. It is a top view which shows the modification of the sandbag which becomes the 1st Embodiment of this invention. It is a top view of the sandbag which becomes the 2nd Embodiment of this invention. It is a top view of the outer bag which comprises the sandbag which becomes the 2nd Embodiment of this invention. It is a top view of the inner bag which comprises the sandbag which becomes the 1st Embodiment of this invention.

Explanation of symbols

1 sandbag body 2 outer bag 3 inner bag 4 water inlet 5 handle

Claims (3)

  An outer bag formed by sewing a base fabric made of a natural material into a bag shape, and an inner bag formed in a sealed bag shape by an impermeable biodegradable sheet and housed in the outer bag A water-absorbing material made of a highly water-absorbing polymer contained in the inner bag, a water injection port for injecting water into the inner bag, and the air in the inner bag provided in the water injection port A sandbag comprising an air vent hole for discharging air.   An outer bag formed by sewing a base fabric made of a natural material into a bag shape, and an inner bag formed in a sealed bag shape by an impermeable biodegradable sheet and housed in the outer bag And a sandbag comprising: a superabsorbent material made of a superabsorbent polymer accommodated in the inner bag; and a water inlet for injecting water into the inner bag. The sandbag according to claim 1 or 2, wherein the outer bag is provided with an annular handle or a handle hole used when carrying the sandbag body or connecting the sandbag bodies.

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