JP2017071922A - Shed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shed capable of easily having target shock tolerance at low cost with a shock relief part capable of improving shock cushioning and shock dispersion in a well-balanced state.SOLUTION: A shed has: a roof part 12 covering a passage, provided along a slope S of a mountain, thereabove; and a shock relief part 14 installed on the roof part 12 and cushioning a shock applied to the roof part 12 when a slope falling body is received. The shock relief part 14 is provided with a first net structure layer 22 and a first cushioning body layer 24, and the first net structure layer 22 has a net 28 spread opposite the roof part 12. The first net structure layer 22 is arranged above the first cushioning body layer 34, and receives the slope falling body on its upper surface. The first net structure body layer 22 can have its shock dispersing and shock cushioning properties adjusted by providing a rope 26, a cushioning device 34 and a long-sized member 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shed for protecting mountain roads and railway tracks from falling rocks and landslides.

  In order to improve the impact resistance of the shed, various techniques have been conventionally proposed. For example, as disclosed in Patent Document 1, there is a protective structure in which one or more layers of nets are installed above a roof that covers an upper part of a passage provided along a slope of a mountain. Each mesh body is stretched between a plurality of support columns erected on the upper surface of the roof, and each mesh body and the roof are arranged at intervals. In addition, a plurality of support wires (wire rope, piano wire, etc.) that support the lower surface of each net are provided, and are installed between a pair of support columns. Each supporting wire is provided with a buffer overlapping portion, and the buffer overlapping portion is configured to slide by friction due to a tensile force applied to the supporting wire.

  Moreover, as disclosed in Patent Document 2, there was a rock fall shelter in which an inclined body inclined at a predetermined angle from a mountain side to a valley side was installed on a roof structure covering the upper side of the passage. As the inclined body, a structure is described in which a plurality of inclined support columns are arranged on a roof structure and a net is stretched thereon.

  In addition, as disclosed in Patent Document 3, there is a lock shed in which a plurality of block bodies made of foam having cushioning properties are laid on the upper surface of a roof covering the upper side of a passage. As a fixing means for preventing displacement of a plurality of block bodies, a structure in which the uppermost surface and side surfaces are covered with a net is described.

JP-A-8-74215 Japanese Utility Model Publication No. 3-62109 JP-A-4-289305

  When a rock fall or the like is received on the upper surface of the shed, if the impact of the rock fall or the like is concentrated on a specific portion, it is necessary to absorb the strong shock only at the specific portion. If it does so, the whole shed must be made into a structure with very high shock-absorbing property so that it may receive rockfall etc. in any part, and cost will become high. Therefore, in order to secure a sufficient impact resistance and reduce the cost, it is preferable that the structure has a structure in which a strong impact applied to a specific portion is dispersed around and efficiently absorbed in a wide area.

  In general, protective nets have shock-absorbing properties that absorb the impact by deforming so that the parts that have fallen on the slopes are recessed, and impact dispersibility that distributes the impact by the nets pulling in the in-plane direction. ing. For example, if the net material is made of a soft material such as synthetic resin or thin metal wire, or if the net is made larger to make it easier to stretch, it will be more easily deformed when it receives falling objects on the slope, and its impact cushioning will be relatively high. Become. On the other hand, when the net is easily deformed, since the force with which the net pulls in the in-plane direction becomes weak, the impact dispersibility becomes relatively low, and the impact tends to concentrate on a part. There are various places where sheds are installed, and the types and sizes of falling objects on the slope and the energy of impacts that are assumed are different, so it is possible to set a good balance between shock cushioning and shock dispersion for each installation location. Become important. However, designing and producing an optimal net for each installation location is time consuming and costly, so it is practically difficult to adjust the shock buffering and shock dispersibility only by changing the specifications of the net.

  In the case of the protective structure of Patent Document 1, since the lower surface of the mesh body is supported by a plurality of support wires, impact dispersibility may be improved by the cooperation of the mesh body and the support wires. is there. However, since it is not described whether or not the net and the supporting wire are connected to each other, the magnitude of the effect is unclear. If the mesh body and the support wire are not connected to each other, for example, if a falling rock having a size that fits in the space between the support wires is received at a portion where there is no support wire, the support wire will be impacted. It is considered that it hardly contributes to the dispersion of. Also in the case of the rock fall shelter of Patent Document 2, since the lower surface of the net is supported by a plurality of inclined support columns, the impact dispersibility may be improved by the cooperation of the net and the inclined support columns. Since it is not described whether or not the net and the inclined column are connected to each other, the magnitude of the effect is unclear in the same manner as described above. As described above, the structures of Patent Documents 1 and 2 do not improve the impact dispersibility depending on the size of the falling rocks or the position where the falling rocks are received, and the impacts tend to concentrate on a specific part such as a net.

  In addition, it is difficult to achieve sufficient shock buffering against falling rocks using only a protective net, and the structures of Patent Documents 1 and 2 are unsuitable for large-scale sheds with very large impact energy. It is.

  In the lock shed of Patent Document 3, a plurality of block bodies made of foam having cushioning properties are laid on the upper surface of the roof, and the impact cushioning properties of each part are excellent, but the foam has low impact dispersibility, The impact tends to concentrate on the parts that have fallen rocks. Therefore, the block bodies must be stacked in multiple stages to ensure shock-absorbing properties, which increases the size of the shed and the cost. The net covering the uppermost layer of the block body is a fixing means for preventing the position deviation of the block body, and is not a net stretched firmly like the net body of Patent Documents 1 and 2, Both impact dispersibility and impact buffering are small, and it hardly affects the impact resistance of the shed.

  The present invention has been made in view of the above-described background art, and a shed capable of easily and cost-effectively realizing a required impact resistance by an impact relaxation portion that can improve impact cushioning and impact dispersibility in a well-balanced manner. The purpose is to provide.

  The present invention includes a roof portion that covers an upper portion of a passage provided along a slope of a mountain, an impact mitigation portion that is installed on the roof portion and softens an impact applied to the roof portion when a slope fall object is received. The impact mitigating portion is provided with one or more net structure layers and one or more buffer layers that overlap each other, and each of the net structure layers includes the roof portion. A first net structure layer that is the uppermost layer in the net structure layer is a first layer that is the uppermost layer in the buffer layer. It is a shed that is disposed above the one buffer layer and receives the sloping fallen object on its upper surface.

  The lower surface of the first net structure layer is supported on the upper surface of the first buffer layer. Alternatively, the first net structure layer is disposed with a space above the first buffer layer. In the latter case, the impact relaxation portion is provided with a second net structure layer that is the net structure layer between the first net structure layer and the first buffer layer, The first net structure layer may be arranged with a space above the second net structure layer.

  The impact relaxation portion includes a third net structure layer that is the net structure layer that supports the lower surface of the first buffer layer, and the buffer that supports the lower surface of the third net structure layer. A second buffer layer that is a body layer is provided.

  At least one of the net structure layers has a plurality of long members that are higher in rigidity than the net and can be deformed when subjected to an impact of a sloping falling object, and the plurality of long members are predetermined to each other. Preferably, a plurality of locations are fixed to the net of the net structure layer, and the amount of elongation of the net is limited in the length direction of the long member.

  In addition, the present invention provides a roof portion that covers an upper portion of a passage provided along a slope of a mountain, and an impact mitigation that is installed on the roof portion and softens an impact applied to the roof portion when a slope fall object is received. Each of which is provided with one or more net structure layers disposed so as to overlap each other, and each of the net structure layers is opposed to the roof portion. The net structure layer has at least one net structure layer having a plurality of elongate members that are higher in rigidity than the net and can be deformed when subjected to an impact of a falling object on the slope, The plurality of elongate members are arranged in parallel at predetermined intervals, a plurality of locations are fixed to the net of the net structure layer, and the extension amount of the net is limited in the length direction of the elongate member. Shed.

  At least one of the net structure layers has a plurality of ropes stretched in parallel with a predetermined distance from each other, and the net of the net structure layer is fixed to the rope at a plurality of locations, It is preferable that the net stretch is limited in the length direction of the rope. In this case, a rope tensioning device for tensioning the rope is installed on the upper surface of the roof portion, and the rope tensioning device includes: a substrate portion placed on the upper surface of the roof portion; You may make it comprise with a pair of rope support part which stands in a predetermined position and to which the edge part of the said rope is fixed. It is preferable that the board portion of the rope tensioning device includes a lattice body in which a plurality of rod members are connected in a lattice shape, and an auxiliary net that covers the upper surface of the lattice body. Moreover, it is preferable that the said board | substrate part of the said rope tensioning apparatus is mounted in the upper surface of the said roof part via an elastic sheet. Furthermore, it is preferable that the rope is stretched through a frictional sliding shock absorber that restricts the tensile force applied to the rope from being a certain level or more.

  The at least one net structure layer may be configured such that the constituent members of the net structure are embedded in a reinforcing material.

  The shed according to the present invention has a unique impact mitigation part on the roof part, according to the type and size of the fallen object, the energy of the assumed impact, etc. Can be set in a well-balanced manner.

  For example, an impact mitigation part that combines a net structure layer and a buffer layer is suitable for a large-scale shed that requires high impact resistance, and improves the impact cushioning and impact dispersibility of the impact mitigation part in a balanced manner. Therefore, it is possible to secure a high impact resistance as a whole shed and to suppress the cost.

  In addition, a simple impact relieving part constituted only by a net structure layer is suitable for a relatively small shed. The net structure layer is provided with a predetermined long member, and by further combining a rope and a shock absorber, the shock buffering and shock dispersibility of each net structure layer can be easily adjusted. Therefore, it is possible to set the impact buffering property and the impact dispersibility of the impact relaxation portion in a well-balanced manner, ensuring a certain amount of impact resistance as a whole shed, and significantly reducing the cost.

It is sectional drawing which shows 1st embodiment of the shed of this invention. It is a top view which shows the structure of the net structure layer of the shed of 1st embodiment. It is a top view which shows the buffer device of the shed rope of 1st embodiment. It is sectional drawing which shows 2nd embodiment of the shed of this invention. It is sectional drawing which shows 3rd embodiment of the shed of this invention. It is sectional drawing which shows 4th embodiment of the shed of this invention. It is sectional drawing which shows 5th embodiment of the shed of this invention. It is sectional drawing which shows 6th embodiment of the shed of this invention. It is sectional drawing which shows 7th embodiment of the shed of this invention. It is a top view which shows the structure of the rope tensioning apparatus of the shed of 7th embodiment. It is sectional drawing which shows 8th embodiment of the shed of this invention. It is sectional drawing which shows 9th embodiment of the shed of this invention. It is sectional drawing which shows 10th embodiment of the shed of this invention.

  Hereinafter, a plurality of embodiments of a shed according to the present invention will be described with reference to the drawings. The shed of each embodiment is installed in a passage (road, railroad track, etc.) provided along the slope S of the mountain, and protects the passage from falling rocks, landslides, avalanches and the like.

  As shown in FIG. 1, the shed 10 according to the first embodiment is installed on the roof portion 12 that covers the upper side of the passage, and is added to the roof portion 12 when slope fallen objects such as falling rocks are received. And an impact mitigating portion 14 for reducing the impact.

  The roof portion 12 is provided on a plurality of main girders 16 arranged at predetermined intervals in the length direction of the passage, and the main girder 16 is supported by a support wall 18 at one end on the slope S side. One end of each side is individually supported by a plurality of support columns 20. The roof portion 12 has a double structure in which a cast-in-place concrete layer 12b is laminated on a floor slab layer 12a. The floor slab layer 12a bridges a plurality of precast concrete floor slabs on a main girder 16. The in-situ concrete layer 12b is formed by placing concrete on the floor slab layer 12a.

  The impact relaxation portion 14 is provided with a first net structure layer 22 and a first buffer layer 24 that are stacked one above the other, and the first net structure layer 22 is located above the first buffer layer 24. It is arranged with a space in between, and it receives sloping fallen objects on its upper surface.

  As shown in FIGS. 1 and 2, the first net structure layer 22 includes a plurality of ropes 26, a net 28, and a plurality of long members 30. The rope 26 is, for example, a stranded wire such as a steel wire or a stainless steel wire, and extends along a rope support portion 32a that is a retaining wall erected along the slope S side end of the top surface of the roof portion 12 and an end on the valley side. And a rope support portion 32b, which is a retaining wall that is erected, is stretched in parallel with a predetermined interval. The end of each rope 26 on the valley side is fixed to the rope support portion 32b via a shock absorber 34. As shown in FIG. 3, the shock absorber 34 has a U-shaped coupling tool 34a, and the U-shaped coupling tool 34a is engaged and fixed to a coupling part 32c attached to the rope support part 32b. At both ends of the U-shaped coupler 34a, a clamping member 34b that slidably clamps a portion slightly inside the end of the rope 26 is provided, and the end of the rope 26 engages with the clamping member 34b and slides. A stopper 34c for stopping the movement is attached. When the shock absorber 34 receives a fallen object on the slope and the tensile force applied to the rope 26 exceeds a predetermined value, the rope 26 frictionally slides in the holding member 34b to buffer the impact.

  The net 28 is a so-called protective net. For example, a synthetic resin net formed by weaving a fiber such as polyethylene having excellent weather resistance against ultraviolet rays, a wire net formed by braiding a wire, or a steel wire is used. A wire mesh or the like that is arranged in a grid and welds the intersections to form a mesh is suitable. The net 28 is fixed to the rope 26 and stretched, and a plurality of places are fixed to the rope 26, whereby the amount of elongation of the net 28 is limited in the length direction of the rope 26.

  The long member 30 has a higher rigidity than the net 28 and is a member that can be deformed when a sloping fall object is received. For example, a narrow metal plate or the like is preferable. The plurality of long members 30 are arranged in parallel in a lattice pattern with a predetermined interval therebetween, and a plurality of locations are fixed to the net 28, and the amount of elongation of the net 28 is limited in the length direction of the long member 30.

  The order of stacking the plurality of ropes 26, the nets 28, and the plurality of long members 30 is arbitrary. However, if importance is attached to the ease of construction, the long members 30 are attached to the ropes 26 after the ropes 26 are stretched. It is preferable to fix a plurality of locations by laying a net 28 on the surface.

  The first buffer layer 24 is provided with a foam block 36 made of, for example, foamed polystyrene, foamed urethane, EVA (ethylene-vinyl acetate copolymer resin) foam or the like on the upper surface of the roof portion 12 to improve weather resistance. It is formed by covering with a protective member 38 for the purpose. As the protective member 38, for example, a thin cloth mold made by injecting concrete into a bag-shaped inner side and curing may be used, or a sheet material having excellent light shielding properties may be used. The first buffer layer 24 has an excellent impact buffering property and does not have to have a very high impact dispersibility.

  Next, the impact resistance of the shed 10 against falling rocks will be described. As described above, the shed preferably has a structure in which a strong impact applied to a specific portion is dispersed around and efficiently absorbed in a wide area in order to secure a sufficient impact resistance and to suppress the cost.

  The net 28 of the first net structure layer 22 has a shock absorption property in which a portion subjected to falling rocks is deformed to absorb the shock, and a shock dispersibility in which the net 28 is pulled in the in-plane direction to disperse the shock. It has. The rope 26 is fixed at a plurality of locations on the net 28 to limit the amount of elongation of the net 28, thereby improving impact dispersibility. Further, the shock absorber 34 improves the shock buffering property by frictional sliding of the end portion of the rope 26 being sandwiched. The long member 30 is fixed to a plurality of locations of the net 28 and restricts the amount of elongation of the net 28, thereby improving impact dispersibility. The long member 30 has higher rigidity than the net 28 and can be deformed when subjected to impacts such as falling rocks, and it is important that the long member 30 be deformed integrally with the nets 28 when subjected to falling rocks. It is preferable to use a metal material that has high toughness and can be elastically deformed and plastically deformed.

  As described above, the impact dispersibility and shock buffering property of the first net structure layer 22 are adjusted by adjusting the rigidity and mesh size of the material of the net 28, adjusting the number and tension of the ropes 26, By adjusting the number of devices 34 and frictional sliding characteristics, or by adjusting the number and rigidity of the long members 30, variable adjustment can be easily performed. In addition, the space between the first net structure layer 22 and the first buffer layer 24 effectively exhibits a buffering function due to the deformation of the first net structure layer 22. The shock dispersibility and shock buffering property of the net structure layer 22 can be variably adjusted by adjusting the distance between the first net structure layer 22 and the first buffer layer 24.

  In the case of the shed 10, the first net structure layer 22 is preferably set so that the impact dispersibility is more important than the impact buffering property. Then, the first buffer layer 24 efficiently absorbs the impact force that is widely dispersed and moderately weakened by the first net structure layer 22 in a wide area by its excellent impact buffering property. As described above, the first net structure layer 22 and the first buffer layer 24 cooperate to significantly reduce the impact applied to the concrete roof portion 12.

  As described above, the shed 10 has the unique impact mitigating portion 14 on the roof portion 12, and mitigates the impact according to the type and size of the fallen object such as falling rocks, the energy of the assumed impact, and the like. The impact buffering property and impact dispersibility of the portion 14 can be set with a good balance.

  In particular, since the impact relaxation part 14 combines the first net structure layer 22 and the first buffer layer 24, it is suitable for a large-scale shed that requires high impact resistance. Since the shock buffering property and the impact dispersibility can be improved in a well-balanced manner, a high impact resistance can be ensured and the cost can be reduced as a whole shed.

  Next, 2nd, 3rd, and 4th embodiment of the shed of this invention is described based on FIGS. Here, the same components as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted. The shed 40 of the second embodiment has an impact mitigating portion 42 different from the above, and the impact mitigating portion 42 has a space below the first net structure layer 22 that receives falling rocks as shown in FIG. A second net structure layer 44 is provided in a space, and a first buffer layer 24 is provided in a space below the second net structure layer 44. In this case, the second net structure layer 44 may have the same configuration as that of the first net structure layer 22, and, for example, the number of the ropes 26 and the long members 30 may be reduced or omitted, and the shock buffering. You may make it the structure which attached importance to the property.

  The shed 46 of the third embodiment has an impact mitigating portion 48 similar to the impact mitigating portion 42 of the shed 40, and the impact mitigating portion 48 is a first net structure that receives rock fall or the like as shown in FIG. A second net structure layer 44 is provided with a space below the layer 22, and the lower surface of the second net structure layer 44 is supported by the upper surface of the first buffer layer 24. In this case, the amount of deformation of the second net structure layer 44 is limited when it receives an impact. For example, the tension of the net 28 or the rope 26 is increased or the number of the long members 30 is increased. Therefore, it is preferable to have a structure with improved impact dispersibility.

  The shed 50 of the fourth embodiment has an impact mitigating portion 52 different from the above, and the impact mitigating portion 52 has a space below the first net structure layer 22 that receives falling rocks as shown in FIG. A first buffer layer 24 is provided, the lower surface of the first buffer layer 24 is supported on the upper surface of the third net structure layer 54, and the lower surface of the third net structure layer 54 is The upper surface of the second buffer layer 56 is supported. In this case, the amount of deformation of the third net structure layer 54 is limited when it receives an impact. For example, the tension of the net 28 or the rope 26 is increased or the number of the long members 30 is increased. Therefore, it is preferable to have a structure with improved impact dispersibility.

  According to the sheds 40, 46 and 50, the same effect as the shed 10 can be obtained, and further, the net structure layer and the buffer layer are increased. Can be improved.

  Next, fifth and sixth embodiments of the shed according to the present invention will be described with reference to FIGS. Here, the same components as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted. The shed 58 of the fifth embodiment has an impact relaxation portion 60 similar to the impact relaxation portion 14 of the shed 10, and the impact relaxation portion 60 is a lower surface of the first net structure layer 22 as shown in FIG. 7. Is supported on the upper surface of the first buffer layer 24. Further, the shed 62 of the sixth embodiment has an impact relaxation portion 64 similar to the impact relaxation portion 52 of the shed 50, and the impact relaxation portion 64 is, as shown in FIG. 8, the first net structure layer 22. The lower surface of the first buffer layer 24 is supported by the upper surface of the first buffer layer 24.

  The sheds 58 and 62 are suitable for a snow shed installed in a snowy cold region. In the snow shed, snow accumulates on the impact relaxation portion and a steady load is applied. However, since the sheds 58 and 62 support the first net structure layer 22 with the first buffer layer 24, the first net structure It is possible to prevent a constant stress from being applied to the layer 22. The first net structure layer 22 of the impact relaxation portions 60 and 64 has a limited deformation amount when subjected to an impact. For example, the tension of the net 28 and the rope 26 is increased, or the long member 30 is increased. It is preferable to increase the impact dispersibility by increasing the number of

  Next, a seventh embodiment of the shed according to the present invention will be described with reference to FIGS. Here, the same components as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted. The shed 66 according to the seventh embodiment has the impact relieving portion 14 that is substantially the same as that of the shed 10, but instead of the rope support portions 32a and 32b for laying the rope 26, the rope tensioning shown in FIG. There is a difference that a device 68 is provided.

  The rope tensioning device 68 includes a base plate portion 70 placed on the upper surface of the roof portion 12, and a pair of rope support portions 72a and 72b that are erected at predetermined positions on the base plate portion 70 and to which the ends of the rope 26 are fixed. It consists of and. For example, as shown in FIG. 10, the substrate 70 has a structure in which the upper surface of a lattice body 70a in which rod members having a certain rigidity are connected in a lattice shape is covered with an auxiliary net 70b. The rope support portion 72a has a structure in which the upper end portions of a plurality of support members 72a-1 erected at the end portion on the slope S side of the substrate portion 70 are connected by a beam material 72a-2. Similarly, the rope support portion 72b has a structure in which the upper end portions of a plurality of support members 72b-1 erected on the end portion on the valley side of the substrate portion 70 are connected by a beam material 72b-2. The rope tensioning device 68 is placed on the upper surface of the roof portion 12, the first buffer layer 24 is laid between the rope support portion 72a and the rope support portion 70b on the upper surface of the substrate portion 70, and further the first A first net structure layer 22 is provided above the buffer layer 24.

  As shown in FIG. 1, the rope support portions 32 a and 32 b of the shed 10 have a structure in which the lower end portion is embedded in the upper surface of the roof portion 12, and can be easily provided when the roof portion 12 itself is newly installed. However, it is not suitable when it is attached to the existing roof portion 12. However, if the rope tensioning device 68 is used, the rope support portions 72a and 72b can be easily provided regardless of whether the roof portion 12 is newly installed or existing.

  Since the rope tensioning device 68 is a lightweight structure in which the base plate portion 70 is composed of the lattice body 70a and the auxiliary net 70b, the rope tensioning device 68 can be easily transported to a site in a mountainous area or installed on the roof portion 12. . In addition, after receiving the impact of the fallen object on the slope, the board portion 70 has a highly rigid surface composed of the lattice body 70a and the auxiliary net 70b, so that the impact force transmitted through the impact relaxation portion 14 is further increased. Can be dispersed. Further, the auxiliary net 70b is deformed so as to sink into the opening of the lattice body 70a, whereby a certain shock absorbing effect is obtained. In addition, when mounting the board | substrate part 70 on the upper surface of the roof part 12, you may mount via elastic sheets, such as an EVA resin foam sheet, for example, when the upper surface of the roof part 12 is not flat, etc. It is.

  Next, an eighth embodiment of the shed according to the present invention will be described with reference to FIG. Here, the same components as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted. The shed 74 of the eighth embodiment has an impact relaxation portion 76 similar to the impact relaxation portion 60 of the shed 58, and the impact relaxation portion 76 is a first structure having a structure different from that of the first net structure layer 22. The net structure layer 78 is provided.

  The first net structure layer 78 has the same rope 26, net 28 and long member 30 as the first net structure layer 22, and these are entirely embedded in a reinforcing material 80 such as concrete. It is characterized by being fixed integrally. According to the first net structure layer 78, the rope support portions 32 a and 32 b and the rope tensioning device 68 are installed on the upper surface of the roof portion 12 by filling and reinforcing the rope 26 in the reinforcing member 80 in a pulled state. There is an advantage that work can be omitted. Further, even if the reinforcing member 80 is damaged due to falling rocks or the like above a certain level, the other portions of the rope 26, the net 28, and the long member 30 are held and fixed by the reinforcing member 80. And shock-absorbing properties. Furthermore, after the breakage, the first net structure layer 78 can be easily repaired by replenishing and hardening the reinforcing member 80 to the broken portion.

  Next, ninth and tenth embodiments of the shed according to the present invention will be described with reference to FIGS. Here, the same components as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted. The shed 82 of the ninth embodiment has an impact mitigating portion 84 that simplifies the impact mitigating portion 14 of the shed 10, and the impact mitigating portion 84 has a space above the roof portion 12 as shown in FIG. It is comprised only by the 1st net structure layer 22 arrange | positioned. The shed 86 of the tenth embodiment has an impact relaxation portion 88 that simplifies the impact relaxation portion 42 of the shed 40, and the impact relaxation portion 88 is spaced from each other above the roof portion 12, as shown in FIG. It is comprised only by the 1st and 2nd net structure layer 22 and 44 arrange | positioned at intervals.

  The shock mitigating portions 84 and 88 of the sheds 82 and 86 are suitable for a comparatively small-scale shed because the buffer layer is omitted and only the net structure layer is formed. The net structure layers 22 and 44 are provided with the long member 30 and further combined with the rope 26 and the shock absorber 34 to easily adjust the shock buffering and shock dispersibility of the net structure layers 22 and 44. it can. Therefore, it is possible to set the impact buffering property and the impact dispersibility of the impact relaxation portion in a well-balanced manner, ensuring a certain amount of impact resistance as a whole shed, and significantly reducing the cost.

  The shed according to the present invention is not limited to the above-described embodiment. For example, the configurations of the roof portion 12, the main beam 16, the support wall 18, and the support column 20 may be replaced with other known configurations. .

  The structure of the net structure layer is not limited as long as it has a net stretched so as to face at least the roof, and the number and length of ropes and shock absorbers for adjusting the impact dispersibility and shock cushioning of the net. The number of scale members can be changed for each net structure layer, and can be omitted as necessary. The arrangement of the ropes and the long members may be any of right angle, parallel, and diagonal with respect to the passage, and may be arranged in a lattice shape or a rhombus shape. The structure for tensioning the rope is not limited to the structure using the rope support portions 32a and 32b and the rope tensioning device 68. For example, an anchor with one end of the rope attached to the slope S is fixed. May be.

  The buffer layer is not limited to materials such as foamed polystyrene, foamed urethane, and EVA foam as described above, and other materials such as rubber chips, waste tires, and sand can be used as long as they have excellent shock buffering properties. Different materials can be selected for each buffer layer. Further, the same material (for example, a block of foamed polystyrene) may be stacked in a plurality of stages to form one buffer material layer, or different materials (for example, a block of foamed polystyrene and an EVA foam sheet) may be stacked to form one buffer layer. It may be a buffer layer. Furthermore, you may arrange | position an impact dispersion board (for example, the grid | lattice-like frame etc. which have the rigidity more than fixed) between stacking.

10, 40, 46, 50, 58, 62, 66, 74, 82, 86 Shed 12 Roof portion 14, 42, 48, 52, 60, 64, 76, 84, 88 Impact mitigating portion 22, 78 First net Structure 24 First buffer layer 26 Rope 28 Net 30 Long member 34 Buffer device 44 Second net structure layer 54 Third net structure layer 56 Second buffer layer 68 Rope stretching device 70 Substrate Portion 70a Grid 70b Auxiliary net 72a, 72b Rope support 80 Reinforcement S Slope

Claims (13)

A shed comprising a roof portion covering an upper part of a passage provided along a slope of a mountain, and an impact mitigation portion which is installed on the roof portion and softens an impact applied to the roof portion when a slope fall object is received. In
The impact mitigating portion is provided with one or more net structure layers and one or more buffer layers that overlap each other, and each net structure layer is stretched so as to face the roof portion. The first net structure layer having a net and being the uppermost layer in the net structure layer is higher than the first buffer layer being the uppermost layer in the buffer layer. The shed is characterized by receiving sloping fallen objects on its upper surface.   The shed according to claim 1, wherein the first net structure layer has a lower surface supported by an upper surface of the first buffer layer.   The shed according to claim 1, wherein the first net structure layer is disposed with a space above the first buffer layer.   The impact relaxation portion is provided with a second net structure layer that is the net structure layer between the first net structure layer and the first buffer layer. The shed according to claim 3, wherein the net structure layer is disposed with a space above the second net structure layer.   The impact relaxation portion includes a third net structure layer that is the net structure layer that supports the lower surface of the first buffer layer, and the buffer that supports the lower surface of the third net structure layer. The shed according to any one of claims 1 to 3, further comprising a second buffer layer which is a body layer.   At least one of the net structure layers has a plurality of long members that are higher in rigidity than the net and can be deformed when subjected to an impact of a sloping falling object, and the plurality of long members are predetermined to each other. The plurality of locations are fixed in parallel to the net of the net structure layer, and the amount of elongation of the net is limited in the length direction of the long member. The stated shed. A shed comprising a roof portion covering an upper part of a passage provided along a slope of a mountain, and an impact mitigation portion which is installed on the roof portion and softens an impact applied to the roof portion when a slope fall object is received. In
The impact relaxation portion is provided with one or more net structure layers disposed so as to overlap each other, and each net structure layer has a net stretched so as to face the roof portion, At least one of the net structure layers has a plurality of long members that are higher in rigidity than the net and can be deformed when subjected to an impact of a falling object on the slope, and the plurality of long members are predetermined to each other. A shed which is arranged in parallel at intervals, and a plurality of places are fixed to the net of the net structure layer, and an extension amount of the net is limited in a length direction of the long member.   At least one of the net structure layers has a plurality of ropes stretched in parallel with a predetermined distance from each other, and the net of the net structure layer is fixed to the rope at a plurality of locations, The shed according to any one of claims 1 to 7, wherein an extension amount of the net is limited in a length direction of the rope.   A rope tensioning device for tensioning the rope is installed on the top surface of the roof portion, and the rope tensioning device is placed on a top surface of the roof portion and at a predetermined position of the substrate portion. The shed according to claim 8, comprising a pair of rope support portions that are erected and to which ends of the ropes are fixed.   The shed according to claim 9, wherein the substrate portion of the rope tensioning device includes a lattice body in which a plurality of rod members are connected in a lattice shape, and an auxiliary net that covers an upper surface of the lattice body.   The shed according to claim 9 or 10, wherein the substrate portion of the rope tensioning device is placed on an upper surface of the roof portion via an elastic sheet.   The shed according to any one of claims 8 to 11, wherein the rope is stretched via a frictional sliding shock absorber that restricts a tensile force applied to the rope from being constant.   The shed according to any one of claims 1 to 12, wherein at least one of the net structure layers has the constituent member of the net structure embedded in a reinforcing material.

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