JP2013200191A - Inner bag for sandbag and sandbag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impermeable inner bag for sandbag eliminating any possibility of breakage due to impurities in soil, having an opening part with a favorable opening property, retaining the open state thereof, and facilitating soil filling work, and to provide a sandbag including the same.SOLUTION: An inner bag 2 for sandbag is formed of an impermeable sheet-like body into a bottomed cylindrical shape with an opening part in the upper part, the impermeable sheet-like body being formed by superposing a thermoplastic synthetic resin layer at least on one surface of a cloth-like body that is formed by using a striate body composed of a uniaxially-stretched thermoplastic synthetic resin, for a warp and a weft. A sandbag 1 is configured by storing the inner bag 2 for sandbag in a thermoplastic-synthetic-resin outer bag 3 having an openable opening part.

Description

  TECHNICAL FIELD The present invention relates to an inner bag for sandbags and a sandbag, and more particularly, to an inner bag for sandbags used for a double-structured sandbag including an inner bag having impermeability in an outer bag, and a sandbag including the same. Regarding bags.

  In general, sandbags are used for, for example, the purpose of stopping leachate by filling and stacking earth and sand. In recent years, large sandbag bags that use a flexible large container-like bag having a suspension belt and perform work of filling, transporting and stacking earth and sand using work machines such as heavy machinery are also used. As a large sandbag bag, there is known a double bag structure of an outer bag and an inner bag, in which the inner bag is filled with earth and sand (Patent Document 1).

  By the way, in order to fill and temporarily store contaminated earth and sand such as earth and sand containing radioactive substances, a large sandbag having such a double structure is used. The sandbag bags filled with contaminated earth and sand will be stored in a temporary storage area until they are transferred to the intermediate storage facility. The period until it is transferred to the intermediate storage facility is expected to be about 5 years at the maximum, and during that time, the contaminated sediment inside can be reliably stored, and the contaminated water does not exude outside as well as the sediment itself. It is necessary to do so.

  For this reason, the outer bag is made of a bag made of a tough and flexible cloth-like body formed by using a filament made of thermoplastic synthetic resin as warp and weft. Because it is necessary to make it impermeable to prevent the contaminated water from exuding to the outside as well as the outer bag when it is filled with earth and sand, a flexible polyethylene bag formed of a polyethylene film in a bag shape is required. It is used.

Japanese Patent Laid-Open No. 11-190015

  However, conventional sandbag bags using polyethylene bags as inner bags have the following problems.

  Various materials are mixed in the earth and sand filled in the inner bag, and in some cases, materials with sharp surfaces such as glass, metal pieces, and wood pieces are also mixed. For this reason, when the earth and sand are filled into the inner bag, these contaminants may come into contact with the inner surface of the inner bag and the inner bag may be damaged. .

  In general, sandbag bags having a double structure are brought into the work site with the inner bag set in the outer bag. For this reason, when starting the filling operation, after opening the opening of the outer bag to the upper side to expose the inner bag, the opening of the inner bag is also opened to the upper side in the same manner to fill the earth and sand. It is necessary to be able to work easily.

  However, the inner bag made of a polyethylene bag is a so-called flexible bag and is not self-supporting. For this reason, it is often stored in the outer bag in a curled and deflated state.Before performing the filling operation, first locate the opening of the inner bag in the outer bag, and then remove the earth and sand. In order to facilitate filling, an operation for opening and opening the opening of the inner bag is required.

  In addition, since the opening of the polyethylene bag is often in poor contact with the opening, it takes time to open the work, and in addition to a large sandbag, the size of the inner bag is 1000 mm or more in both length and width. Therefore, in order to inflate the inner bag, it is necessary to send air into the inside from the opening using a blower, which is troublesome and requires a blower for each filling work place. was there.

  Moreover, since the polyethylene bag is flexible and has no stiffness, it is difficult to maintain the opening state of the opening, and even if it is opened once, it easily bends and returns to a deflated state, and the work at the time of earth and sand filling The property was also extremely bad.

  In particular, in order to quickly process an extremely large amount of contaminated earth and sand, it is necessary to quickly fill the sandbags one after another. For this reason, the inner bag for sandbag bags and the sandbag bag which can perform filling operation | work smoothly and do not have a possibility of leaching of contaminated water have been desired.

  Therefore, the present invention has no risk of breakage due to contaminants in the earth and sand, the opening of the opening is good and the opening state can be maintained, and the earth and sand filling operation is extremely smooth. It is an object of the present invention to provide an impervious inner bag for sandbag that can be performed.

  In addition, the present invention has no risk of breakage due to contaminants in the earth and sand, the opening of the opening is good and the opening state can be maintained, and the earth and sand filling operation is extremely smooth. It is an object of the present invention to provide a sandbag bag having an impermeable inner bag that can be provided in the outer bag.

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

(Claim 1)
A sandbag with a double structure is formed by being housed in an outer bag, and is an inner bag for a sandbag that is filled with earth and sand.
Using a water-impermeable sheet-like body in which a thermoplastic synthetic resin layer is laminated on at least one surface of a cloth-like body formed by using a linear body made of a uniaxially stretched thermoplastic synthetic resin for warp and weft An inner bag for sandbag bags, which is formed in a bottomed cylindrical shape having an opening at the top.

(Claim 2)
The inner bag for sandbag bags according to claim 1, wherein the thermoplastic synthetic resin layer of the sheet-like body is disposed at least on the outer surface.

(Claim 3)
The sandbag bag inner bag according to claim 1 or 2, wherein the sheet-like body is formed by laminating a thermoplastic synthetic resin layer on both surfaces of the cloth-like body.

(Claim 4)
The inner bag for sandbag bags according to claim 1, 2 or 3, wherein the overlapping portions of the end portions of the sheet-like body are heat-sealed.

(Claim 5)
The sandbag body according to any one of claims 1 to 4, wherein the filament is formed of any one of a polyolefin-based synthetic resin, a polyamide-based synthetic resin, or a polyester-based synthetic resin. bag.

(Claim 6)
The inner bag for sandbag bags according to any one of claims 1 to 5, wherein the striate body is a flat yarn.

(Claim 7)
The said linear body is 50-10000 dtex, a thread width of 0.3-30 mm, and the numbers of warps and wefts driven are respectively 3-90 / 吋. Inner bag for sandbag bags.

(Claim 8)
The thermoplastic resin layer is formed of any one of a polyolefin-based synthetic resin, a polyamide-based synthetic resin, a polyester-based synthetic resin, a polyvinyl chloride-based synthetic resin, or a polyvinylidene chloride-vinyl copolymer-based synthetic resin. The inner bag for sandbag bags according to any one of claims 1 to 7.

(Claim 9)
An outer bag made of a thermoplastic synthetic resin whose upper part can be opened, and an inner bag for a sandbag bag according to any one of claims 1 to 8, which is housed in the outer bag and filled with earth and sand. A sandbag bag featuring.

(Claim 10)
The sandbag according to claim 9, wherein the inner bag is formed to have a size larger than that of the outer bag.

  According to the present invention, there is no fear of damage due to contaminants in the earth and sand, the opening of the opening is good and the opening state can be maintained, and the earth and sand filling operation is extremely smooth. An impervious inner bag for sandbag that can be provided can be provided.

  Further, according to the present invention, there is no risk of damage due to contaminants in the earth and sand, the opening property of the opening is good, and the opening state can be maintained, so that the earth and sand filling operation is extremely possible. It is possible to provide a sandbag bag provided with an impermeable inner bag that can be smoothly carried in the outer bag.

Exploded perspective view of sandbag according to the present invention Top view of cloth body Sectional drawing which shows an example of a sheet-like object Sectional drawing which shows another example of a sheet-like object (A)-(c) are sectional views of the striatum The figure explaining the formation method of the inner bag for sandbag bags concerning this invention Diagram explaining the work of filling sandbags with earth and sand (A) (b) is a figure explaining the operation | work which fills sandbags with earth and sand. The perspective view which shows the other aspect of the inner bag for sandbag bags concerning this invention The perspective view which shows the further another aspect of the inner bag for sandbag bags which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view of a sandbag according to the present invention.

  The sandbag 1 has a double structure of an inner bag 2 and an outer bag 3 that houses the inner bag 2 therein. The inner bag 2 is a bag-like body for filling the inside with earth and sand, and is formed in a bottomed cylindrical shape. The outer bag 3 is a bag-like body that covers the outer side of the inner bag 2 filled with earth and sand, mainly for protecting and transporting the inner bag 2, and has a bottomed cylindrical shape similar to that of the inner bag 2. Is formed.

  The shape of the inner bag 2 and the outer bag 3 is not limited to a cylindrical shape, and for example, both may be formed into a bottomed rectangular tube shape. Here, the inner bag 2 has a circular bottom portion 21a, a bottomed cylindrical inner bag body 21 having an opening 23 in the upper portion, and a lid portion integrally connected to the upper end of the inner bag body 21. 22 is shown. The inner bag main body 21 and the lid portion 22 are integrally formed of a water-impermeable sheet-like body 4.

  Hereinafter, the sheet-like body 4 will be described.

  As shown in FIGS. 2 to 4, the sheet-like body 4 has a thermoplastic synthetic resin layer on at least one surface of a cloth-like body 41 formed by linearly-stretched thermoplastic synthetic resin linear bodies 41 a and 41 b. By being formed by laminating 42, it has a so-called stiffness as well as an impermeable function. As a result, the inner bag 2 is a flexible bag-like body, but has shape retention and self-supporting properties.

  As shown in FIGS. 2 and 3, the cloth-like body 41 can be a woven cloth woven using uniaxially stretched linear synthetic resin-made linear resin bodies 41 a and 41 b as warps and wefts. . The weaving method is generally a plain weave, but may be a twill weave. Moreover, the knitted fabric knitted using the linear body made from a thermoplastic synthetic resin may be sufficient. 2 and 3 show a plain-woven cloth-like body 41. FIG.

  In addition, as shown in FIG. 4, the cloth-like body 41 includes a large number of linear bodies 41b arranged in one direction, and a large number of linear bodies 41a arranged in a direction perpendicular to the linear bodies 41b. It is good also as the cross-bonded cloth (soft) which joined.

  As the linear bodies 41a and 41b made of a thermoplastic synthetic resin, flat yarns, split yarns, monofilaments, multifilaments, spun yarns of short fibers, etc. made of a uniaxially stretched thermoplastic synthetic resin can be used. A flat yarn can be preferably used.

  As shown in FIG. 5 (a), the linear bodies 41a and 41b may be a single-layer body composed of a single layer of the base layer 40a. Also, as shown in FIG. The bonding layer 40b may be laminated on one side, or the bonding layer 40b may be laminated on both sides of the base layer 40a as shown in FIG. 5C.

  As the thermoplastic synthetic resin constituting the base layer 40a in such a single layer or laminate, a resin having a large stretching effect, generally a crystalline resin, is used. High density polyethylene, medium density polyethylene, polypropylene, ethylene / propylene Polyolefin synthetic resins such as copolymers, ethylene / α-olefin copolymers, polyamide synthetic resins such as nylon, and polyester synthetic resins such as polyethylene terephthalate, polybutylene terephthalate, polylactic acid, and polybutylene succinate. be able to.

Of these, polyolefin copolymers such as polyethylene and polypropylene are preferred from the viewpoint of processability and economy. As the polyethylene, high density polyethylene is preferable, and as the high density polyethylene, the density is 0.930 to 0.970 g / cm ³ , preferably 0.940 to 0.960 g / cm ³ , and the MFR (melt flow rate) is 0.00. It is preferably 1 to 10.0 g / 10 minutes, more preferably 0.1 to 5.0 g / 10 minutes. As the polypropylene, the density is 0.890 to 0.920 g / cm ³ , preferably 0.900 to 0.915 g / cm ³ , and the MFR is 0.1 to 10.0 g / 10 minutes, preferably 0.1 to 5. The thing of 0 g / 10 minutes is preferable.

  The bonding layer 40b is formed in a linear shape after the filaments 41a and 41b are woven as shown in FIGS. 2 and 3, or after the filaments 41a and 41b are cross-bonded as shown in FIG. It joins between the bodies 41a and 41b, or joins with a thermoplastic resin layer 42, which will be described later, laminated on the cloth-like body 41, and has a lower melting point than the synthetic resin constituting the base layer 40a, and heat fusion A synthetic resin having excellent properties is used.

  Specifically, high pressure method low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, polyolefin such as ethylene / propylene copolymer, polyethylene terephthalate, polyester such as polybutylene terephthalate, nylon 6, nylon 66, etc. A synthetic resin having a melting point lower than that of the synthetic resin constituting the base layer 40a is selected from synthetic resins such as polyamide, acrylic resin, and polyvinyl chloride synthetic resin.

  Various additives can be added to the synthetic resin used as the base layer 40a or the bonding layer 40b depending on the purpose. Specifically, organic phosphorus-based, thioether-based antioxidants; hindered amine-based light stabilizers; benzophenone-based, benzotriazole-based, benzoate-based ultraviolet absorbers; anti-static agents; bisamide-based, wax-based, Dispersants such as organic metal salts; lubricants such as amides and organic metal salts; flame retardants such as bromine-containing organic, phosphoric acid and antimony trioxide; organic pigments; inorganic pigments; inorganic fillers and organic fillers An inorganic or organic antibacterial agent such as a metal ion type.

  These additives are appropriately combined and blended in any process for producing the material composition of the base layer 40a and the bonding layer 40b. The blending of the additive may be prepared by mixing at a predetermined ratio using a kneading device such as a conventional known twin screw extruder, Banbury mixer, kneader, mixing roll, and melt-kneading the mixture. A so-called master batch having a high concentration may be prepared and used after being diluted.

  When the laminated body of the base layer 40a and the joining layer 40b is used as the linear bodies 41a and 41b, as a means for molding a laminated film that becomes a molding material, a film that becomes the base layer 40a and a film that becomes the joining layer 40b are formed in advance. Then, a means for forming a multilayer using a dry laminating method or a thermal laminating method, a method of coating a synthetic resin to be the bonding layer 40b on the surface of the film to be the base layer 40a, a bonding layer to the film to be the previously formed base layer 40a The method can be appropriately selected from known means such as extrusion lamination of 40b or extrusion molding as a laminated film by a multilayer coextrusion method. Among these, in terms of ease of molding, cost, and adhesiveness between each layer of the product, a method of obtaining a laminated body of the base layer 40a and the bonding layer 40b in a single step by a multilayer coextrusion method is preferable.

  Moreover, as a means to extend | stretch and make the filaments 41a and 41b, in the case of a single layer body, it can carry out by a well-known method, and in the case of a laminated body, after extending | stretching the film used as the base layer 40a to a uniaxial direction The synthetic resin to be the bonding layer 40b may be laminated and slit into a tape shape, or before slitting the laminated film in which the base layer 40a and the bonding layer 40b are laminated, or after being slit, the uniaxial direction It can also be obtained by stretching. The draw ratio is usually about 3 to 20 times.

  The thickness of the filaments 41a and 41b is preferably in the range of 50 to 10000 dt (decitex), and the yarn width is preferably in the range of 0.3 to 30 mm.

  In addition, it is preferable that the number of driven filaments 41a and 41b is 3 to 90 / cm for each of the warp and the weft.

  The thermoplastic synthetic resin layer 42 laminated on at least one side of the cloth-like body 41 formed by the linear bodies 41a and 41b closes the gap between the linear bodies 41a and 41b of the cloth-like body 41 and is a sheet. At the same time as imperviousness is imparted to the body 4, so-called stiffness is imparted to the flexible cloth body 41 having flexibility. Thereby, the impermeable sheet-like body 4 having a firmness as a whole can be obtained. Therefore, by forming the inner bag 2 with such a sheet-like body 4, it does not become deflated and curled even when stored in the outer bag 3 like a conventional polyethylene bag, and has a bottomed cylindrical shape. It is possible to obtain an impermeable bag-like body having a shape retaining property and a self-supporting property that can maintain the shape of the product and can stand on its own.

  As a resin used as the thermoplastic synthetic resin layer 42, polyolefin synthetic resins such as low density polyethylene, linear low density polyethylene, polypropylene, ethylene / propylene copolymer, ethylene / α-olefin copolymer, Polyamide synthetic resins such as nylon, polyethylene terephthalate, polybutylene terephthalate, polyester synthetic resins such as polylactic acid, polybutylene succinate, polyvinyl chloride synthetic resins, and polyvinylidene chloride-vinyl copolymer synthetic resins may be used. it can.

  As a combination of the synthetic resin used for the filaments 41a and 41b and the synthetic resin used for the thermoplastic synthetic resin layer 42, a similar synthetic resin or a different synthetic resin may be used. From the viewpoint of obtaining the same, it is preferable to use a combination of synthetic resins of the same type, for example, both using a synthetic polyolefin resin.

  The method of laminating the thermoplastic synthetic resin layer 42 on the cloth-like body 41 can be performed by known means. For example, the cloth-like body 41 and the thermoplastic synthetic resin layer 42 are stacked and thermocompression bonded using a hot roll. A method, a method of extruding and laminating the thermoplastic synthetic resin layer 42 in the form of a film on the cloth-like body 41, a method of adhering the thermoplastic synthetic resin layer 42 with an adhesive such as a hot melt agent, and the like can be employed.

  If the thickness of the thermoplastic synthetic resin layer 42 is too thick, the inner bag 2 becomes too rigid and the handling becomes worse, and if it is too thin, it becomes difficult to express the shape retaining property and the self-supporting property and the workability becomes worse. 15 to 700 μm, preferably 15 to 500 μm, and more preferably 15 to 400 μm.

  In this manner, the thermoplastic synthetic resin layer 42 is laminated and integrated with the cloth-like body 41 to form the water-impermeable sheet-like body 4. As shown in FIGS. 3A and 4A, the sheet-like body 4 is not limited to the one in which the thermoplastic synthetic resin layers 42 are laminated on both surfaces of the cloth-like body 41, respectively. 4 (b), the thermoplastic synthetic resin layer 42 may be laminated only on one side of the cloth-like body 41, and the thermoplastic synthetic resin layer 42 is laminated on at least one side of the cloth-like body 41. It only has to be done.

  Next, an example of a method of forming the inner bag 2 using the sheet-like body 4 is shown in FIG.

  The bottom part 21a of the inner bag main body 21 is formed by processing the sheet-like body 4 into a circular shape. On the other hand, the cylindrical side peripheral wall 21b and the lid portion 22 of the inner bag main body 21 are formed by rounding one rectangular sheet-like body 4 into a cylindrical shape. In the drawing, for convenience of explanation, the inner bag body 21 and the lid portion 22 are distinguished from each other by a boundary line. However, in actuality, both are formed by a single sheet-like body 4. There is no distinction because they are one-piece.

  The sheet-like body 4 forming the side peripheral wall 21b and the lid portion 22 of the inner bag main body 21 is formed in a cylindrical shape by joining the overlapping portions after overlapping the end portions. And the bottom part 21a is attached to the lower end edge, and both the superposition | polymerization parts are heat-sealed similarly, and the bottomed cylindrical inner bag 2 which has the opening part 23 in the upper part as a whole is formed.

  As a method for joining the polymerized portions, in addition to heat sealing for thermally welding the thermoplastic synthetic resin layers 42, welding by high frequency welding or ultrasonic welding, adhesion by a liquid adhesive or hot melt adhesive, adhesion by an adhesive tape, etc. Can be adopted. Of these, heat sealing is preferred because it can be simply and reliably joined.

  The code | symbol 100 in FIG. 6 has shown the junction part. By joining the overlapped portions by these methods, a penetrating portion by a sewing thread is not formed in the sheet-like body 4 as in the case of sewing, so there is no possibility that contaminated water will ooze out from the joining portion. In particular, when the joining portion 100 is formed by welding such as heat sealing, the inner bag 2 expands by filling with earth and sand and the peeling force is parallel to the joining surface because it is strong against the peeling force parallel to the joining surface. Will not peel off even if it works.

  When the sheet-like body 4 is the one in which the thermoplastic synthetic resin layer 42 is laminated only on one side of the cloth-like body 41 as shown in FIGS. 3B and 4B, the thermoplastic synthetic resin layer It is preferable to arrange so that the 42 side becomes the outer surface side of the inner bag 2. Since the thermoplastic synthetic resin layer 42 is a part that imparts a substantially water-impermeable function to the sheet-like body 4, the thermoplastic synthetic resin layer 42 is filled with earth and sand by being disposed on the outer surface side of the inner bag 2. In doing so, the thermoplastic synthetic resin layer 42 and earth and sand are prevented from coming into direct contact with each other, and the thermoplastic synthetic resin layer 42 can be prevented from being damaged.

  When the sheet-like body 4 formed by laminating the thermoplastic synthetic resin layer 42 only on one side of the cloth-like body 41 is heat-sealed, the bonding between the cloth-like body 41 and the thermoplastic synthetic resin 42 Therefore, in order to ensure high sealing performance, the thermoplastic synthetic resin layer 42 is partially laminated on the surface of the cloth-like body 41 overlapped with the one thermoplastic synthetic resin layer 42, so that the joining portion Is preferably bonded between the thermoplastic synthetic resin layers 42.

  When the sheet-like body 4 is one in which the thermoplastic synthetic resin layers 42 are laminated on both surfaces of the cloth-like body 41 as shown in FIGS. 3 (a) and 4 (a), the inner and outer sides of the inner bag 2 Since the thermoplastic synthetic resin layers 42 are disposed on both sides, the inner bag 2 can have a high water-impervious function, and the inner surface of the inner bag 2 has irregularities due to the texture of the cloth-like body 41. Since it is blocked by the resin layer 42, contaminants in the earth and sand are not caught on the inner surface, and the earth and sand slide well and can be filled smoothly.

  The outer bag 3 that houses the inner bag 2 is formed in a bottomed cylindrical shape having an opening 34 in the upper portion by a cloth-like body made of thermoplastic synthetic resin. When the inner bag 2 has a rectangular tube shape, the outer bag 3 is preferably formed in a rectangular tube shape.

  The outer bag 3 includes an outer bag body 31 having a bottom 31a, a cylindrical lid portion 32 sewn on the upper end of the outer bag body 31, and a plurality of suspension belts 33. It is of a structure generally known as an outer bag.

  The outer bag body 31 and the lid 32 are both plain weave, twill weave, etc., using a linear body made of a thermoplastic synthetic resin uniaxially stretched like the cloth-like body 41 used for the inner bag 2 for warp and weft. A cross-bonded fabric (soft fabric) in which a large number of woven fabrics and a large number of striated bodies are arranged side by side in one direction, and a number of striated bodies are arranged side by side in the direction perpendicular thereto, and the intersections are joined. ) Or the like. By these cloth-like bodies, the outer bag body 31 is formed in a bottomed cylindrical shape, and in the case of the lid portion 32, it is formed in a cylindrical shape, and the lid portion 32 is sewn to the upper end 31b of the outer bag body 31 so as to be integrated. It has become.

  The lid portion 32 is for sealing the upper portion of the outer bag main body 31 with a lid, and a binding string 32 a for binding the mouth at the time of sealing is sewn on the outer peripheral surface of the lid portion 32. The opening portion 34 of the outer bag 3 is formed by the upper end opening of the lid portion 32.

  The suspension belt 33 is sewn along the vertical direction on the outer peripheral surface of the outer bag main body 31. Two adjacent suspension belts 33 project from the upper portion of the outer bag body 31 and are integrally connected to form a loop portion 33a. The loop portion 33a can be hooked on a hook or the like of a work machine during transportation. In addition, it can be hooked on a frame or the like for opening the opening 34 when the earth and sand are filled.

  At the bottom 31a of the outer bag 3, each end of the suspension belt 33 is folded to form a small loop portion 33b, and a single rope 35 is bridged and tightened across each loop portion 33b. As a result, the load applied to the bottom 31a can be supported from below.

  The sandbag 1 having a double structure is configured by housing an inner bag 2 in an outer bag 3. Here, the size of the inner bag 2 is slightly larger than the size of the outer bag 3. As shown in the drawing, when the inner bag 2 and the outer bag 3 are both cylindrical, the diameter of the inner bag 2 is 2 to 20% larger than the diameter of the outer bag 3. When the inner bag 2 and the outer bag 3 are both rectangular tubes, the length of one side of the inner bag 2 is 2 to 20% larger than that of the outer bag 3. Further, the inner bag 2 is preferably formed so that the inner bag 2 is 2 to 20% higher than the outer bag 3.

  Specifically, as shown in the figure, when both the inner bag 2 and the outer bag 3 are bottomed cylindrical shapes, the diameter of the inner bag 2: φ1300 mm, the height of the inner bag main body 21 portion: 1200 mm, the lid portion 22 The height of the part: 1000 mm, the diameter of the outer bag 3: φ1100 mm, the height of the part of the outer bag body 31: 1100 mm, and the height of the part of the lid part 32: 900 mm.

  Thus, by forming the size of the inner bag 2 slightly larger than the size of the outer bag 3, when the inner bag 2 is filled with earth and sand, the force that causes the inner bag 2 to expand laterally is increased. The inner bag 2 itself can be prevented from being subjected to a substantial load. Further, even when the sandbags 1 filled with earth and sand are stacked in multiple stages, the outer bag 3 can receive the force that the inner bag 2 tries to expand in the lateral direction due to the load. There is no load. For this reason, durability of the inner bag 2 can be maintained over a long period of time.

  When the sandbag 1 is filled with earth and sand, for example, as shown in FIG. 7, first, the sandbag 1 containing the inner bag 2 is prepared in the outer bag 3, and the loop 33a of the suspension belt 33 is connected to the loop 33a. The hook F is hooked and supported, and the opening 34 of the outer bag 3 and the opening 23 of the inner bag 2 are opened to the outside to form a filling port. At this time, the inner bag 2 is flexible and has a so-called stiffness, and is self-supporting while retaining a certain bottomed cylindrical shape inside the outer bag 3. As described above, there is no need to inflate the inner bag 2 with a blower, the opening 23 can be easily opened without being in close contact with each other, and the shape can be easily opened because it has excellent shape retention and self-supporting properties. Can be maintained.

  Next, the inner bag 2 is filled with earth and sand by a heavy machine or the like, but the sheet-like body 4 constituting the inner bag 2 is formed using the linear bodies 41a and 41b made of a uniaxially stretched thermoplastic synthetic resin. Since it has the cloth-like body 41, even if it contacts with the contaminants in the earth and sand, it is hard to tear and there is no possibility that the inner bag 2 will be damaged.

  When the inner bag 2 is filled with earth and sand, as shown in FIG. 8A, the opening portion 23 is formed by squeezing the lid portion 22 of the inner bag 2 and tying it in a purse-like shape using a tie string 24 as necessary. Seal. Thereafter, as shown in FIG. 8 (b), the lid portion 32 of the outer bag 3 is similarly squeezed and sealed in a purse-like shape with a tie string 32a, whereby the sandbag 1 filled with earth and sand is obtained. Since the entire inner bag 2 including the lid portion 22 is formed of the water-impermeable sheet-like body 4, it is difficult for rainwater to enter and there is no possibility that contaminated water will ooze out.

  Therefore, there is no possibility that the inner bag 2 is damaged during the filling of the earth and sand, the opening of the opening 23 is also good, the opening state can be easily maintained, and the earth and sand filling operation is performed very smoothly. Will be able to.

  The lid portion 22 of the inner bag 2 described above is formed integrally with the inner bag body 21 by the single sheet-like body 4, but the inner bag body 21 and the lid portion 22 may be separate. In the case of a separate body, for example, the sheet-like body 4 of the inner bag body 21 has a thermoplastic synthetic resin layer 42 on both sides of the cloth-like body 41 as shown in FIGS. 3 (a) and 4 (a). By using the sheet-like body 4 of the lid portion 22 having the thermoplastic synthetic resin layer 42 on one side of the cloth-like body 41 as shown in FIGS. 3B and 4B, the lid The portion 22 may be made more flexible than the inner bag body 21 to improve the sealing performance.

  In order to further improve the sealing property, a flexible polyethylene sheet similar to the conventional one can be used only for the lid portion 22. Even in this case, since the inner bag main body 21 has shape retention and self-supporting properties, the openability is better than that of the conventional inner bag made of a polyethylene sheet.

  Furthermore, when the inner bag main body 21 and the lid portion 22 are separated, as shown in FIG. 9, the lid portion 22 is formed in a so-called hat shape and sealed by covering the upper portion of the inner bag main body 21. You may do it. In this case, the lid portion 22 may be prevented from being detached by binding the inner bag main body 21 and the lid portion 22 with a strap (not shown) or by tightening the periphery of the lid portion 22.

  Furthermore, as shown in FIG. 10, the lid portion 22 is formed in a plurality of tongue pieces along the upper end opening of the inner bag body 21, so that it is folded inward after filling with the earth and sand, and the opening of the inner bag body 21 After that, the hat-shaped lid portion 22 shown in FIG. 9 may be further covered and further sealed.

1: sandbag bag 2: inner bag 21: inner bag body 21a: bottom part 22: lid part 23: opening part 24: tied string 3: outer bag 31: outer bag body 31a: bottom part 31b: upper end 32: lid part 32a: tied String 33: Suspension belt 33a: Loop part 34: Opening part 35: Rope 4: Sheet-like body 40a: Base layer 40b: Bonding layer 41: Cloth-like body 41a, 41b: Linear body 42: Thermoplastic synthetic resin layer 100: Heat Seal part F: Hook

Claims (10)

A sandbag with a double structure is formed by being housed in an outer bag, and is an inner bag for a sandbag that is filled with earth and sand.
Using a water-impermeable sheet-like body in which a thermoplastic synthetic resin layer is laminated on at least one surface of a cloth-like body formed by using a linear body made of a uniaxially stretched thermoplastic synthetic resin for warp and weft An inner bag for sandbag bags, which is formed in a bottomed cylindrical shape having an opening at the top.   The inner bag for sandbag bags according to claim 1, wherein the thermoplastic synthetic resin layer of the sheet-like body is disposed at least on the outer surface.   The sandbag bag inner bag according to claim 1 or 2, wherein the sheet-like body is formed by laminating a thermoplastic synthetic resin layer on both surfaces of the cloth-like body.   The inner bag for sandbag bags according to claim 1, 2 or 3, wherein the overlapping portions of the end portions of the sheet-like body are heat-sealed.   The sandbag body according to any one of claims 1 to 4, wherein the filament is formed of any one of a polyolefin-based synthetic resin, a polyamide-based synthetic resin, or a polyester-based synthetic resin. bag.   The inner bag for sandbag bags according to any one of claims 1 to 5, wherein the striate body is a flat yarn.   The said linear body is 50-10000 dtex, a thread width of 0.3-30 mm, and the numbers of warps and wefts driven are respectively 3-90 / 吋. Inner bag for sandbag bags.   The thermoplastic resin layer is formed of any one of a polyolefin-based synthetic resin, a polyamide-based synthetic resin, a polyester-based synthetic resin, a polyvinyl chloride-based synthetic resin, or a polyvinylidene chloride-vinyl copolymer-based synthetic resin. The inner bag for sandbag bags according to any one of claims 1 to 7.   An outer bag made of a thermoplastic synthetic resin whose upper part can be opened, and an inner bag for a sandbag bag according to any one of claims 1 to 8, which is housed in the outer bag and filled with earth and sand. A sandbag bag featuring. The sandbag according to claim 9, wherein the inner bag is formed to have a size larger than that of the outer bag.

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