Rescue net device

Abstract

To provide a rescue net device which improves the strength and shape stability of a net material as a whole and makes it easier for victims to climb up by himself / herself.SOLUTION: A rescue net device includes a fiber net material 20 with diamond-shaped mesh 23, strands S of the net material 20 are arranged in the inclination direction of an inclined plane 41, and a hybrid structure is presented in which multiple core threads 21 bent in a zigzag shape are combined with multiple sheath threads 22 wound around the core threads 21, and diamond-shaped mesh 23 is arranged in the inclination direction of the inclined plane 41.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a rescue net device to be installed in reservoirs, regulating reservoirs, waterways, etc. (hereinafter collectively referred to as "reservoirs"). [Background technology]

[0002] Every year, there are a number of accidents involving people falling into reservoir ponds. In particular, the slopes of reservoir ponds are often covered with synthetic rubber or synthetic resin waterproof sheets or flat block revetments, making the slopes of such ponds slippery. In view of this situation, various rescue net devices have been proposed to enable victims to climb out of a building by themselves.

[0003] Patent Document 1 discloses a rescue net device that includes a fiber net material and a plurality of weights that are attached to the bottom of the net material. Explaining with reference to FIG. 6, a conventional net material 50 is a net material in which warp strands 51 and weft strands 52 are crossed and knitted into a lattice shape, with mesh 53 having square (rectangular) meshes. When laying the net material 50 on the slope of a reservoir, the strands 51 of the net material 50 are laid vertically, and then the upper side of the net material 50 is fixed to the slope by driving piles or anchor pins into the slope.

[0004] It has also been proposed to use metal materials such as wire mesh as the material for the net. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2003-336241 A [Patent Document 2] Japanese Patent Application Publication No. 3-284498 Summary of the Invention [Problem to be solved by the invention]

[0006] Conventional rescue net devices using fiber netting materials have the following problems. <1> Most fiber netting materials 50 are made of soft fiber material, so when laid on the slope of a reservoir, the net surface easily conforms to the contours of the slope and sticks to it. Therefore, not only is it difficult for a victim to grab the netting material with their hands, but also it is difficult for their feet to get caught in the mesh when they try to get their toes caught while wearing shoes. <2> As shown in FIGS. 6(B) and 6(C), when an attempt is made to grip the fiber net material 50, the square mesh 53 is unlikely to deform in the contracting direction. Therefore, not only is it difficult for a victim to grab hold of the net material 50 with their hands, but the victim must also crawl up the slope on all fours with both their hands and feet on the slope. When on all fours, it is difficult to put strength into your hands and you cannot brace your feet as well as you can when standing, making it difficult to climb a slope. Furthermore, the crawling position not only makes you tired easily, but also lowers the victim's viewpoint, making it difficult to accurately assess the situation, which increases psychological anxiety. <3> When a victim grabs hold of the net material 50 and climbs up, the victim's weight is applied to a specific one of the wire strands 51, and the victim is supported through the specific one of the wire strands 51. Therefore, the load borne by the longitudinal strands 51 constituting the net material 50 is large. <4> Because the fiber net material 50 is lightweight, multiple workers must throw weights 54 made of sandbags, chains, etc. attached to the bottom of the net material 50 into the reservoir, and the installation work of the net material 50 requires a lot of time and effort.

[0007] The conventional rescue net device having a metal net material has the following problems. <1> Metallic netting materials are heavy and difficult to transport and handle. <2> Metal netting has a smooth wire surface, which can easily cause hands and feet to slip when climbing up. <3> Because it is made of metal, the deformation and displacement when grabbing the wire mesh is small, and the user must crawl up on all fours. <4> Because the facility is located near water such as a reservoir, the metal netting material is susceptible to corrosion.

[0008] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a rescue net device which can solve the above problems. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the present invention provides a rescue net device for reservoirs, which comprises a fiber net material that is laid on a slope and has a diamond-shaped mesh made by crossing multiple strands arranged diagonally, and multiple anchors that fix the upper edge of the net material to the shoulder of the embankment, wherein the strands of the net material have sufficient rigidity to maintain the diamond-shaped mesh shape, the net material is laid on the slope with the diamond-shaped mesh aligned in the direction of the slope, and is configured to allow the diamond-shaped mesh to expand and contract in both the left-right and vertical directions when a victim grasps the strands surrounding the mesh. In another embodiment of the present invention, the mesh of the net material has a longitudinal diamond shape. In another embodiment of the invention, the netting material is knitted using a raschel stitch. In another form of the invention, the strand of netting material has a hybrid structure that combines a plurality of core threads arranged in a zigzag pattern along the inclination direction of the slope with a plurality of sheath threads wound around the core threads. In another embodiment of the present invention, the stiffness of the core yarns is higher than that of the sheath yarns. In another embodiment of the present invention, the core yarn constituting the strand is a monofilament yarn, and the sheath yarn wound around the core yarn is a multifilament yarn. Effect of the Invention

[0010] The rescue net device according to the present invention has at least one of the following advantages. <1> In the present invention, the diamond-shaped mesh of the net material is laid in a vertically elongated state, which allows the mesh to deform in both the left-right and vertical directions when a victim grasps the net material. Therefore, compared to conventional net materials with square mesh, the net material has better elastic deformation properties in the left-right and vertical directions. <2> Because the net material allows for expansion and contraction deformation in both the left-right and vertical directions, it is not only easier to grasp with the hands, but also makes it possible for the victim to move the net material away from the slope when climbing up the slope. In particular, even if both the left and right sides of the net material are fixed to the slope, the net material can be separated from the slope. This allows victims to climb up the netting in a standing position. <3> If a victim climbs in an upright position, it is easier to put strength into their hands and they can brace themselves with both feet compared to a crawling position. Not only does this make the victim less likely to get tired, but it also improves the victim's viewpoint, improving visibility and allowing them to accurately assess the situation, eliminating any increased anxiety the victim may feel. Overall, compared to conventional textile or metal netting materials, the netting makes it easier for disaster victims to climb and is significantly safer when climbing. <4> Since a core thread is woven inside the strands that make up the net material, the straightness of the strands is increased, improving the shape stability of the net material. Therefore, when the net material is laid on an undulating slope, gaps are likely to form between the net material and the slope. The gaps formed between the net material and the slope not only make it easier to grab the net material with your hands, but also make it easier to hook the toes of your feet into the mesh. <5> In the present invention, the diamond-shaped mesh of the net material is laid in a vertical position, so that the load is distributed and supported by the strands above the strand directly grasped with the fingers, thereby reducing the load borne by the entire net material. <6> The surface of the strands that make up the netting material is covered with a sheath yarn knitted with needle loops or the like using multifilament yarn, which has a larger surface area than monofilament yarn, so that the frictional resistance of the surface of the netting material is large. Therefore, not only can the net material be effectively prevented from slipping on the waterproof sheet laid on the slope, but slipping can also be effectively prevented when a disaster victim walks on the net material. <7> A hard, highly rigid core thread is woven inside the strands that make up the netting material, giving the entire netting material appropriate rigidity and weight. Therefore, the deployed shape can be maintained by the rigidity and weight of the net material, without the need for a dedicated weight at the bottom of the net material. <8> Since the net material is made of fiber, it is more corrosion-resistant and easier to handle than metal net materials. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a rescue net device according to the present invention laid on the slope of a reservoir; [Diagram 2] In the explanatory diagram of the netting material, (A) is a model diagram of a core thread with some parts omitted, and (B) is a model diagram of a netting material that combines multiple core threads and sheath threads. [Diagram 3] An explanatory diagram of the deformability of the diamond-shaped mesh of the net material. (A) is a model diagram of the mesh before deformation, and (B) is a model diagram of the mesh during deformation. [Figure 4] Illustration of disaster victims climbing uphill [Diagram 5] Illustrative diagram of load transfer in net material [Figure 6] An explanatory diagram of a conventional net material with square mesh. (A) is a plan view of the net material. (B) is a model diagram of the mesh (square mesh) before deformation. (C) is a model diagram of the mesh (square mesh) after deformation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rescue net device according to the present invention will now be described in detail with reference to the drawings.

[0013] <1> Overview of rescue net equipment Referring to Figure 1, the rescue net device 10 of the present invention is a device that is laid on the slope 41 of a reservoir 40 and comprises a fiber net material 20 and a plurality of anchors 30 for fixing the net material 20 to the slope 41.

[0014] <2> Net material (Figure 2) The net material 20 has a plurality of strands S intersecting at an angle with a certain distance therebetween, forming longitudinally elongated diamond-shaped meshes 23 between the intersecting strands S. The strands S constituting the net material 20 have sufficient rigidity to maintain the diamond shape of the mesh 23. In this example, the strand S is knitted with multiple types of filaments having different rigidity and diameters, and presents a hybrid structure combining multiple core yarns 21 that form the skeleton of the net material 20 and multiple sheath yarns 22 that are wound around the core yarns 21.

[0015] Referring to Figure 2, the strands S constituting the net material 20 will be described. The strands S constituting the net material 20 are composed of a rigid monofilament core yarn 21 and a multifilament sheath yarn 22 braided so as to wrap around the core yarn 21. The core yarn 21 has a higher rigidity than the sheath yarn 13 . The net material 20 can be knitted, for example, by raschel knitting.

[0016] <2.1> Core yarn The reason for using a rigid monofilament yarn for the core yarn 21 is to give the net material 20 an appropriate rigidity to improve the straightness of the strands S that make up the net material 20 and to suppress deformation of the net material 20 due to expansion and contraction.

[0017] The material of the core thread 21 is appropriately selected depending on the application, and for example, chemically synthesized fibers such as polyester, polyethylene, polypropylene, etc. can be used.

[0018] The core yarn 21 has a length that spans the entire length of the net material 20 (from the shoulder portion to the toe portion), and is bent and woven in a zigzag shape along the vertical direction of the net material 20. The core yarns 21 are knotted with sheath yarns 22 of multifilament yarn at the intersections of the core yarns 21 and at the butt joints of the bent portions of the core yarns 21.

[0019] As shown in FIG. 2, in this example, the bending length (distance of the inflection point) L 1 The length of one side of mesh 23 is L 2 The bending length L of the core yarn 21 is set to twice the length L of the core yarn 21. 1 is the side length L of mesh 23 2 or the length of one side of the mesh 23 L 2 The dimensions may be set to three or more times the above. The net material 20 has a bending length L of the core thread 21. 1 The overall force dispersion of the net material 20 increases in proportion to the length of the net material 20.

[0020] <2.2>Sheath thread The sheath yarn 22 is made of a multifilament yarn, and for example, a separate and independent sheath yarn 22 is wound around each core yarn 21 by chain stitch. The reason for using a bundle of multifilament yarns for the sheath yarn 22 is to increase the surface area and thereby increase the frictional resistance on the surface of the net material 20, thereby effectively preventing the net material 20 from slipping on the waterproof sheet 42 laid on the slope and when a disaster victim walks on the net material 20.

[0021] The material of the sheath thread 22 is appropriately selected depending on the purpose. The material of the sheath yarn 22 may be, for example, a chemical fiber yarn such as a polyester yarn or a polyamide yarn (nylon yarn).

[0022] For comparison, let us assume that the strand S is formed by using a small-diameter monofilament yarn for the sheath yarn 22. When a small-diameter monofilament is used for the sheath yarn 22, the rigidity of the strand S itself increases, but the frictional resistance of the strand S decreases, making the net material more slippery.

[0023] <2.3> Mesh The shape of the mesh 23 of the net material 20 will be described with reference to FIG. FIG. 3(A) shows a model diagram of the mesh before deformation, and FIG. 3(B) shows a model diagram of the mesh 23 after deformation.

[0024] Conventional fiber netting materials have square mesh, but in the present invention, the mesh 23 of the netting material 20 has a vertically elongated diamond shape.

[0025] As shown in Figure 3(A), a vertically elongated rhombus is one in which all sides are of equal length, the angles of the apex a and the bottom c of the mesh 23 are acute angles (same angle), and the angles of the left and right b and d of the mesh 23 are obtuse angles (same angle). The core yarn 21 has a length that spans the entire length of the net material 20 (from the shoulder portion to the toe portion), and is bent and woven in a zigzag shape along the vertical direction of the net material 20. The acute and obtuse angles of the mesh 23 can be appropriately selected.

[0026] The interior angles (acute and obtuse angles) of the mesh 23 can be set arbitrarily by adjusting the bending angle of the core yarn 21 when knitting the net material 20.

[0027] The mesh 23 of the net material 20 is made into a vertically elongated diamond shape in order to improve the load distribution by the net material 20 toward the slope shoulder, to make it easier for a disaster victim to grasp multiple strands S at the same time when grabbing the net material 20 with their hands, and to allow the net material 20 to expand and contract in the left-right and vertical directions, thereby separating the net material 20 from the slope.

[0028] <3> Fixing means The fixing means is for fixing the net material 20 and is composed of a plurality of anchors 30. In addition, a steel bar (not shown) inserted through the mesh 23 on the upper side of the net material 20 may be fixed with an anchor 30.

[0029] [How to install the net material] A method for installing the net material 20 will be described with reference to FIG.

[0030] The net material 20 is rolled up and carried to the site of the reservoir 40.

[0031] After one end of the net material 20 is fixed to the top end of the reservoir 40 with an anchor 30, the roll-shaped net material 20 is unrolled toward the toe of the slope. When the net material 20 is deployed, the net material 20 rolls down along the slope 41 by utilizing its own weight. When laying the net material 20 on the slope 41, the diamond-shaped mesh 23 is laid along the inclination direction of the slope 41.

[0032] A hard core thread 21 having high rigidity is woven inside the strands S constituting the net material 20, giving the entire net material 20 appropriate rigidity and weight. Therefore, even without providing a dedicated weight at the bottom of the net material 20, the deployed shape can be maintained by the rigidity and weight of the net material 20. In this way, the net material 20 can be easily deployed by a small number of workers.

[0033] [Characteristics of rescue net devices] The characteristics of the rescue net device 10 will now be described.

[0034] <1> Shape stability of the net material (non-conforming to slope undulations) Conventional fiber netting materials have the characteristic that the entire net is made of a soft material with a uniform structure, making it easy for the netting material to conform to the undulating surfaces of slopes and stick to them.

[0035] In contrast, in the present invention, a hard and rigid core yarn 21 is woven as an insertion yarn inside the strands S that make up the net material 20, which increases the straightness of the strands S that make up the net material 20. Not only is the strength of the net material 20 improved overall, but the shape stability of the net material 20 is also improved due to its own rigidity. Therefore, when the net material 20 is laid on an undulating slope 41, it becomes difficult for the net material 20 to follow the undulations of the slope 41, and gaps are likely to form between the net material 20 and the slope 41.

[0036] The size of the gap formed between the net material 20 and the slope 41 is an important factor when grabbing the net material 20 with the hands or trying to hook the toes of the feet into the mesh 23; the larger the gap between the net material 20 and the slope 41, the easier it is to grab the net material 20 with the hands and to hook the toes of the feet into the mesh 23.

[0037] <2> Number of strands grabbed As shown in FIG. 6, the conventional square-mesh fiber netting material 50 has small deformability of the mesh 53 in the left-right and vertical directions, so when the netting material 50 is grasped with one hand, the number of strands is about one warp strand 51. Therefore, the load is concentrated on one part of the victim's hand, causing great pain to the victim's hand, making it difficult for the victim to climb up the square-mesh fiber net material 50.

[0038] In contrast, in the present invention, as shown in Figures 3(B) and (C), the mesh 23, which has a vertically elongated diamond shape, has great deformability in the left-right direction, making it possible to grasp two or more strands S with one hand. Therefore, compared to a square-mesh fiber net, the load on the victim's 43 hands is distributed, reducing pain in the hands (Figure 5).

[0039] <3> Contraction and deformation of net material As shown in Figures 6(B) and (C) , the conventional square-mesh fiber net material 50 does not deform in the left-right or vertical directions when the net material is grasped with the fingers, so that the shape of the mesh 53 remains square. In other words, in the conventional square-mesh fiber net material 50, as shown in Figs. 6(B) and (C), the mesh 53 does not deform significantly in the left-right direction. This is because the mesh 53 having a square shape has little deformation allowance.

[0040] In contrast, in the present invention, as shown in Figures 3(B) and (C), when two strands S surrounding mesh 23B in the center of the drawing are grasped, the angle between the top a and bottom c of mesh 23B becomes smaller, and the angles b and d of mesh 23B on the left and right sides become wider, causing the shape of mesh 23B in the center of the drawing to shrink and deform toward the left and right, while at the same time the diamond shape of mesh 23B in the center of the drawing is elongated vertically.

[0041] The separate meshes 23A and 13C adjacent to each other on the left and right allow expansion deformation in the left and right direction toward the central mesh 23B. Similarly, the other meshes adjacent to the separate meshes 23A and 13C also undergo a chain of expansion deformation in the left and right direction. In this way, the net material 20 has better elasticity and deformability in the left-right and vertical directions compared to conventional net materials with square mesh, making it easier for victims to grasp the net material 20 with their hands.

[0042] <4> Victim's posture when climbing Since the net material 20 has room for expansion and contraction in the left-right and vertical directions, when a victim 43 grabs and pulls the net material 20, the net material 20 floats up and separates from the slope 41. Even if both the left and right sides of the net material 20 are fixed to the inclined surface 41, the net material 20 can be grasped at a position away from the inclined surface 41. Therefore, as shown in FIG. 4, a victim 43 can climb up a slope 41 while standing. In other words, it is as if the victim 43 could climb up safely using the rescue rope material hanging down the slope 41. When victim 43 climbs uphill, standing upright allows him / her to put more strength into his / her hands and feet, and not only does it make victim 43 less tired, but it also improves his / her viewpoint because it increases his / her visibility, allowing him / her to accurately assess the situation, and reduces his / her sense of anxiety.

[0043] <5> Load transmission range Conventional netting materials with square mesh are designed to support the weight of a disaster victim through a single warp strand held by the hand, and the load borne by each warp strand that makes up the netting material is large. In other words, conventional netting materials with square mesh have a very narrow range in which the weight of the victim can be distributed.

[0044] In contrast, as shown in FIG. 5, in the present invention, the diagonal strands S that make up the net material 20 have continuity throughout the entire net, so that the load is not supported only by the two strands S that are directly grasped by the hands, but is also distributed and supported by the strands S above the two strands S that are directly grasped by the hands. That is, in the net material 20 in which the mesh 23 has a vertically elongated diamond shape, the weight of the victim 43 is distributed over a wider range. If the range over which the weight of the victim 43 is distributed is increased, the load on the upper edge of the net material 20 that fixes the net material 20 is also reduced.

[0045] <6> Non-slip net material Conventional fiber netting materials with square mesh have low friction resistance because they are made from soft fiber materials. Therefore, when the waterproof sheets or netting materials laid on slopes get wet, the netting materials become slippery, making it difficult for disaster victims to walk.

[0046] In contrast, the surfaces of the oblique strands S constituting the net material 20 are covered with sheath yarns 22 of multifilament yarns, and the frictional resistance of the net material 20 is increased. Therefore, not only can the net material 20 be effectively prevented from slipping on the PVC waterproof sheet 42 laid on the slope 41, but slipping can also be prevented when a disaster victim walks on the net material 20. [Explanation of symbols]

[0047] 10. Rescue net device 20. Net material S... Strand 21... Core yarn 22...Sheath thread 23. Mesh (vertical diamond) 30. Anchor 40. Reservoir 41. Slope of the reservoir 42...Waterproof sheet 43. Victims

Claims

1. A rescue net device for a reservoir comprising a fiber net material laid on a slope and made of a crossed plurality of strands arranged diagonally so as to form a diamond shape, and a plurality of anchors for fixing the upper edge of the net material to the slope of a bank, The strands of the netting material have sufficient rigidity to maintain a diamond-shaped mesh shape, The net material is laid on a slope with the diamond-shaped mesh aligned along the slope direction of the slope, The mesh is configured to allow the mesh to expand and contract in the left-right and vertical directions when a victim grasps the strands around the mesh, Rescue net device.

2. 2. The rescue net device according to claim 1, wherein the mesh of the net material is in the shape of a vertically elongated diamond.

3. 2. A rescue net device according to claim 1, wherein the net material is knitted by raschel knitting.

4. The rescue net device as described in claim 1, characterized in that the strand of net material has a hybrid structure combining a plurality of core threads arranged in a zigzag shape along the inclination direction of the slope and a plurality of sheath threads wound around the core threads.

5. 5. A rescue net device according to claim 4, wherein the stiffness of said core yarns is higher than that of said sheath yarns.

6. 5. A rescue net device according to claim 4, characterized in that the core yarn constituting the strand is a monofilament yarn, and the sheath yarn wound around the core yarn is made of a multifilament yarn.

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