JP7142304B1 - Gabions and slope protection methods - Google Patents

Abstract

An object of the present invention is to suppress deterioration due to frost heave, thereby ensuring protection of slopes and the like. A gabion containing a laminated body (200) in a net-like frame is installed on a slope or the like. The laminate 200 is composed of a first permeable layer 210, a heat insulating layer 220, and a second permeable layer 230 laminated in this order from the ground. The first water permeable layer 210 allows water to pass through in a direction intersecting the stacking direction of the laminate 200 . The heat insulating layer 220 is made of a material having higher heat insulating properties in the stacking direction than other layers. The second permeable layer 230 allows water to pass through in a direction crossing the lamination direction, and has a larger mass than the first permeable layer 210 . [Selection drawing] Fig. 4

Description

Application of Article 30, Paragraph 2 of the Patent Act [Published] February 26, 2021 [Online] The 61st Geotechnical Society Hokkaido Branch Annual Technical Report Meeting, sponsored by the Geotechnical Society Hokkaido Branch [ Release date] December 3, 2021 [Publication location] Konbukariishi, Urahoro-cho, Tokachi-gun, Hokkaido

TECHNICAL FIELD The present invention relates to a gabion that secures protection of a slope, etc., and a slope protection method using the gabion.

In cold regions such as Hokkaido, it is known that slopes and surface layers of soil structures are deformed or collapsed when the frozen soil thaws in winter. As a countermeasure, there is a method of protecting the slope by installing a gabion such as a futon basket on the ground, as in the construction method described in Patent Document 1.

JP-A-61-137922

However, even if the gabion protects the slope, the gabion itself deteriorates as the strength of the soil behind the gabion (back soil) decreases, as described below. It may not be possible to secure enough. When the cold weather intensifies, the ground behind the gabions gathers underground water and freezes while forming frost columns (ice lenses). This ice lens causes a frost heaving phenomenon in which the ground surface is lifted, and the gabions are lifted together. After that, during the thawing period, the frozen backsoil thaws and presents a state containing a lot of water. As a result, the back soil tends to move downward due to the inclination of the slope, and the gabion also moves at the same time, thereby deforming the gabion. And by repeating this every year, the deformation of the gabion becomes larger and deteriorates, resulting in a decline in the function of protecting the slope.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gabion that suppresses deterioration due to frost heave, thereby ensuring protection of a slope, and a method for protecting the slope.

The gabion of the present invention includes a net-like frame and a laminate housed in the frame, and the laminate is arranged in a direction intersecting the stacking direction of the laminate in order from the side closest to the ground. A first water-permeable layer that allows water to pass through, a heat-insulating layer made of a material that has higher heat insulation in the stacking direction of the laminate than other layers, and a water-permeable layer in a direction that intersects the stacking direction of the laminate. and a second permeable layer having a larger mass than the first permeable layer.

According to the invention, an insulating layer is provided within the gabion. For this reason, frost heaving is less likely to occur on the ground where the gabions are installed. Therefore, deterioration of gabions, slopes, etc. due to frost heave is suppressed. Therefore, the protection of slopes and the like is ensured. A first permeable layer is provided at a position closer to the ground than the heat insulating layer. If there is no first permeable layer, it may be difficult for inflow water to drain through the gabion to the slope surface. In contrast, in the present invention, since the first permeable layer is provided between the heat insulating layer and the ground, the water seeping out from the ground is easily discharged through the first permeable layer.

In the present invention, the frame body has a columnar shape defined by side walls, a ceiling wall and a bottom wall, and the reinforcing member extending along the side walls from the ceiling wall toward the bottom wall is the It is preferably provided on the frame. When the gabion is transported, the frame is distorted by its own weight, and such deformation may reduce the function of the gabion to protect the slope. On the other hand, since the reinforcement member suppresses the deformation of the gabion, the function of the gabion is less likely to deteriorate.

In the present invention, at least two reinforcing members are provided so as to face each other in a direction perpendicular to the stacking direction, one end of which is fixed to one of the two reinforcing members, and the other end is fixed to the other. It is preferred to have a wide stop bar. According to this, the deformation of the gabion is further suppressed by the width-stopping bars. Therefore, the function of the gabion is less likely to deteriorate.

In the present invention, a first arm extending along one side wall of the frame from the ceiling wall to the bottom wall of the frame, and a side wall opposite to the one side wall from the ceiling wall to the bottom wall of the frame. and a connecting portion extending along the bottom wall from the bottom wall side end of the first arm to the bottom wall side end of the second arm. It is preferable that a hanging metal fitting is provided, and that the hanging metal fitting is supported by the frame so as to be rotatable with respect to the frame around the connecting portion. According to this, when transporting the gabion, it can be suspended by a crane or the like using the suspension fitting. At this time, since the hanging metal fitting rotates around the connecting portion, the frame body can be in a state of being obliquely inclined with respect to the hanging metal fitting. Therefore, it is easy to install a gabion on a slope such as a slope.

According to another aspect of the present invention, there is provided a method for protecting a slope, in which a plurality of gabions are moved to the middle of the slope while being suspended by a suspension device using the suspension fittings, so that the gabions are closely spaced. Arrange them on the slope so that they are adjacent to each other. According to this, the gabion can be installed halfway up the slope using a suspension device such as a crane.

In the present invention, the gabion is provided with a pressure-receiving plate installed so as to sandwich the bottom wall of the frame body between the ground and the ground. is preferably fixed to According to this, damage to the rock bolt due to frost heave is suppressed by using the gabion and the rock bolt of the present invention together.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view which shows the state which installed the gabion which concerns on the 1st Embodiment of this invention on the slope. Figure 2 is a perspective view of the single gabion of Figure 1; FIG. 3 is a perspective view of the gabion of FIG. 2 with some components removed; FIG. 3 is a cross-sectional view of the gabion of FIG. 2 taken along line IV-IV; FIG. 2 is a flow chart showing a series of steps for producing the gabion of FIG. 1 and installing it on a slope; FIG. 6 is a perspective view of a mold used in the process of FIG. 5; FIG. 5 is a schematic front view including a partial cross-section of a gabion according to a second embodiment of the present invention; FIG. 11 is a schematic front view including a partial cross-section of a gabion according to a third embodiment of the present invention;

<First embodiment>
A gabion 1 according to a first embodiment, which is one embodiment of the present invention, and a slope protection method using the same will be described with reference to FIGS. 1 to 5. FIG.

The gabion 1 is a material for civil engineering having a general rectangular parallelepiped shape as shown in FIGS. As shown in FIG. 1, a plurality of gabions 1 are laid on the slope so as to be closely adjacent to each other without any gaps, thereby protecting the slope. The gabion 1 is fixed to anchor pins 11 driven into the ground from the slope. Also, the gabions 1 are tightly connected to each other by connectors 12 .

Each gabion 1, as shown in FIG. 2, has a frame 100, a laminate 200 (see FIG. 4), and a hanger 300. As shown in FIG. Note that FIG. 2 omits the illustration of the structure on the other side of the mesh that should originally appear through the mesh. Hereinafter, as shown in FIG. 2, the width direction of the gabion 1 in plan view is the left-right direction, the longitudinal direction of the gabion 1 in plan view is the front-rear direction, and the direction orthogonal to both the left-right direction and the front-rear direction is the up-down direction. (Lamination direction referred to in the invention). Such directions are set for the convenience of explanation, and do not necessarily indicate the directions when the gabion 1 is used. The gabion 1 may be manufactured according to the shape, height, geology, etc. of the slope, in addition to those specified by JIS (Japanese Industrial Standard). For example, the size of the gabion 1 in the vertical direction is 0.3m to 0.4m, the size in the lateral direction is 1m, and the size in the longitudinal direction is 1.0m or 2.0m.

The frame 100 is a member having a general rectangular parallelepiped (or quadrangular prism) shape that defines the outer shape of the gabion 1 . Note that the shape of the frame 100 may have a general columnar shape other than a rectangular parallelepiped, such as a circular column, an elliptical column, a triangular column, a pentagonal column, or the like. The frame 100 has a frame main body 120 and reinforcing members 151 , 152 , 161 and 162 . The frame main body 120 is a rectangular parallelepiped made up of a left side wall 121, a right side wall 122, a front side wall 123, a rear side wall 124, a ceiling wall 125 and a bottom wall 126 (hereinafter sometimes collectively referred to as "wall portions 121 to 126"). is a box-shaped member of The walls 121 to 126 respectively form six sides of a rectangular parallelepiped. Each wall consists of a straight iron wire 120a and a mesh iron wire 120b. The iron wires forming these may be plated with zinc, aluminum, or the like for rust prevention or the like. The iron wire 120 a extends along each side of the rectangular parallelepiped and forms the framework of the frame body 120 . Conventionally known shapes such as rhombuses, round holes, and tortoise shells are applied to the mesh shape of the iron wire 120b. The wire diameter of the iron wire is, for example, 5.0 mm for the iron wire 120a and 3.2 mm for the iron wire 120b.

As shown in FIGS. 2 and 3, the reinforcing members 151, 152, 161 and 162 are straight iron wire members having both ends fixed to 120a. An iron wire thicker than the iron wire 120a (for example, a wire diameter of 6.0 mm) is used for these reinforcing members. The reinforcement member 151 extends vertically along the left side wall 121 from the ceiling wall 125 toward the bottom wall 126 in the middle of the left side wall 121 in the front-rear direction. The reinforcement member 152 extends vertically along the right side wall 122 from the ceiling wall 125 toward the bottom wall 126 in the middle of the right side wall 122 in the front-rear direction. The reinforcing members 151 and 152 face each other in the left-right direction. The reinforcing member 161 extends vertically along the front wall 123 from the ceiling wall 125 toward the bottom wall 126 in the middle of the front wall 123 in the left-right direction. The reinforcing member 162 extends vertically along the rear wall 124 from the ceiling wall 125 toward the bottom wall 126 in the middle of the rear wall 124 in the left-right direction. The reinforcing members 161 and 162 face each other in the front-rear direction.

Left and right width stop bars 170 are fixed to the reinforcing members 151 and 152 . The left and right width retaining bars 170 are made of, for example, reinforcing bars with a wire diameter of 6.0 mm, and are thicker and stronger than the iron wires 120 a forming the framework of the frame body 120 . The left and right width retaining bars 170 are arranged in the vicinity of the upper surface of the heat insulating layer 220 to be described later with respect to the vertical direction, and are fixed to the reinforcing member 151 by bending one end thereof. Similarly, the other end is bent and hooked to the reinforcing member 152 and fixed. Front and rear width stoppers 180 are fixed to the reinforcing members 161 and 162 . The front and rear width fixing bars 180 are made of the same reinforcing bars as the left and right width fixing bars 170 . The front-to-rear width retaining bar 180 is arranged in the vicinity of the upper surface of the heat insulating layer 220 to be described later in the vertical direction, and is fixed to the reinforcing member 161 by bending one end thereof and hooking it. Similarly, the other end is bent and hooked to the reinforcing member 162 and fixed.

As shown in FIG. 4, the layered body 200 is formed by stacking a first permeable layer 210, a heat insulating layer 220, and a second permeable layer 230 vertically. Each layer extends along both the front-back direction and the left-right direction. Note that each layer may spread in a direction that is inclined with respect to the front-rear and left-right directions as long as the direction intersects the vertical direction. The laminate 200 has substantially the same shape and dimensions as the space within the frame 100 and is accommodated within the frame 100 . The first permeable layer 210 is a layer having a drainage function. The first permeable layer 210 allows water to pass along the direction in which the layer extends, thereby allowing water to pass through the gabion 1 . For the first water permeable layer 210, a water permeable sheet or the like made of synthetic resin nonwoven fabric or the like is used. For example, "Guri-Sheet" (Takironshiaisivir Co., Ltd.) is used. A PBD material used in a PBD (plastic board drain) construction method may be used.

The heat insulating layer 220 is a layer having a heat insulating function. The heat insulating layer 220 is made of a material that has a higher heat insulating property in the vertical direction than the first water permeable layer 210 and the second water permeable layer 230 . For the heat insulating layer 220, for example, solid heat insulating material such as styrene foam and urethane foam, which are materials for construction or civil engineering, are used. Other insulating materials such as foam concrete or foam glass may be used.

The second permeable layer 230 is a layer having a drainage function. The second permeable layer 230 allows water to pass along the direction in which the layer extends. For the second permeable layer 230, filling materials used in conventional gabions such as futon baskets may be used, or other materials may be used. For example, a coarse-grained material, gravel, or crushed stone obtained by adjusting gravel, recycled aggregate, or the like to have an appropriate particle size distribution may be used. A mixture of such coarse-grained material and gravel, gravel, or crushed stone may also be used. When these materials are used as the filling material for the second water-permeable layer 230, non-woven fabric is spread over the left and right width stopping bars 170 and the front and rear width stopping bars 180, and the filling material is placed thereon. good. This suppresses the outflow of the filling material. The second permeable layer 230 is a layer having a larger mass than the first permeable layer 210 and serves to provide the gabion 1 with the function of a heavy stone with good drainage.

The first permeable layer 210, the heat insulating layer 220, and the second permeable layer 230 are arranged in the order of the first permeable layer 210, the heat insulating layer 220, and the second permeable layer 230 from the side closer to the ground. As for the thickness (size in the vertical direction) of these layers, the first permeable layer 210 is the smallest, the heat insulating layer 220 is the second smallest, and the second permeable layer 230 is the largest. For example, the first permeable layer 210 is 5 mm, the heat insulating layer 220 is 5 cm, 10 cm, or 15 cm, the second permeable layer 230 is 25 cm, and the height (vertical size) of the entire gabion 1 is about 30 cm to 40 cm. Become.

The sling fitting 300 includes a front sling fitting 310 and a rear sling fitting 320, as shown in FIGS. The hanging metal fitting 300 is made of, for example, an iron wire with a wire diameter of 8.0 mm. The front suspension metal fitting 310 has a first arm portion 311 , a second arm portion 312 and a connecting portion 313 . The first arm portion 311 is arranged such that the tip bent leftward into an inverted U shape protrudes upward from the ceiling wall 125 . The first arm portion 311 extends vertically along the left side wall 121 toward the bottom wall 126 from the front end slightly forward of the middle of the left side wall 121 in the front-rear direction. Both ends of the connecting portion 313 in the left-right direction are connected to the lower ends of the first arm portion 311 and the second arm portion 312, respectively. The connecting portion 313 extends from the lower end of the first arm portion 311 to the lower end of the second arm portion 312 along the bottom wall 126 in parallel with the front wall 123 . The second arm portion 312 is arranged such that the tip bent rightward into an inverted U shape protrudes upward from the ceiling wall 125 . The second arm portion 312 extends vertically along the right side wall 122 toward the bottom wall 126 from the tip portion slightly forward of the middle of the right side wall 122 in the front-rear direction. A spiral body 400 that is a coiled iron wire is wound around the connecting portion 313 from the left end to the right end. This spiral body 400 is also wound around the mesh iron wire 120b. As a result, the front hanging metal fitting 310 is supported by the frame main body 120 so as to be rotatable in the direction A in FIG.

The rear hanging metal fitting 320 has a first arm portion 321 , a second arm portion 322 and a connecting portion 323 . The first arm portion 321 is arranged such that the tip bent leftward into an inverted U shape protrudes upward from the ceiling wall 125 . The first arm portion 321 extends vertically along the left side wall 121 toward the bottom wall 126 from the tip portion slightly behind the center of the left side wall 121 in the front-rear direction. Both ends of the connecting portion 323 in the left-right direction are connected to the lower ends of the first arm portion 321 and the second arm portion 322, respectively. The connecting portion 323 extends from the lower end of the first arm portion 321 to the lower end of the second arm portion 322 along the bottom wall 126 in parallel with the front wall 123 . The second arm portion 322 is arranged such that the tip bent rightward into an inverted U shape protrudes upward from the ceiling wall 125 . The second arm portion 322 extends vertically along the right side wall 122 toward the bottom wall 126 from the tip portion slightly behind the center of the right side wall 122 in the front-rear direction. A helical body 400 that is a coiled iron wire is wound around the connecting portion 323 from the left end to the right end. This spiral body 400 is also wound around the mesh iron wire 120b. As a result, the rear suspension metal fitting 320 is supported by the frame main body 120 so as to be rotatable in the direction B in FIG.

The steps of manufacturing and installing the gabion 1 will be described below with reference to FIG. The fabrication of the gabion 1 is carried out on the flat ground below the planned construction position on the slope. First, the bottom wall 126, the left side wall 121, the right side wall 122, the front side wall 123 and the rear side wall 124 of the frame 100 constituting the walls of the gabion 1 are placed on a flat surface. (step S1). At this stage, the side walls 121-124 already have the reinforcing members 151, 152, 161 and 162 attached thereto. Also, the hanging hardware 300 is already attached to the bottom wall 126 . Next, on the bottom wall 126, a drainage material (permeable sheet or the like) forming the first water permeable layer 210 and a heat insulating material forming the heat insulating layer 220 are installed (step S2). Next, the side walls 121 to 124 are erected and joined together, and a formwork 50 (see FIG. 6) for rolling compaction is placed outside the side walls 121 to 124 (step S3). The formwork 50 is configured by connecting and fixing four iron plates 51 to each other. A flat plate member made of other material such as wood may be used instead of the iron plate 51 . An eyebolt 52 is fixed to the upper end of the iron plate 51 . The eyebolts 52 are used for carrying the formwork 50 .

Next, the left and right width stopping bars 170 and the front and rear width stopping bars 180 are arranged on the upper surface of the heat insulating layer 220 and fixed to the reinforcing members 151, 152, 161 and 162. A non-woven fabric for preventing the outflow of is installed (step S4). Next, the filling material forming the heat insulating layer 220 is put on the nonwoven fabric (step S5). Here, every time an amount of filling material corresponding to a predetermined thickness (for example, 15 cm) is thrown in, the filling material is subjected to rolling compaction. The formwork 50 installed in step S3 prevents the sidewalls 121 to 124 from bulging outward greatly when the filling material is rolled.

Next, the ceiling wall 125 forming the upper part of the gabion 1 is attached to the upper ends of the side walls 121 to 124, and the formwork 50 is removed (step S6). Thus, the gabion 1 is completed. Next, using a crane or a backhoe, the completed gabion 1 is placed in a horizontal posture (that is, the ceiling wall 125 and the bottom wall 126 are aligned in the horizontal direction). While hanging the gabion 1 on the slope, the gabion 1 is transported to a yard (relay point) installed in the vicinity of the planned construction position on the slope (step S7). Next, the suspension wire used in the previous step is used in another wire so that the inclination of the gabion 1 corresponds to the slope slope (that is, the ceiling wall 125 and the bottom wall 126 slope along the slope). The gabion 1 is replaced with a hanging wire and hung on the hanging fitting 300, and the gabion 1 is transported from the yard to the site where construction is planned, and the gabion 1 is installed on the slope (step S8). Here, as described above, since the front hanging metal fitting 310 and the rear hanging metal fitting 320 are rotatable around the connecting portions 313 and 323, the gabion 1 can be hung by using the hanging metal fitting 300 and an appropriate hanging wire. can be properly tilted. By repeating steps S1 to S8, a plurality of gabions 1 are installed on the slope so as to be closely adjacent to each other. Then, the gabions 1 are tied together using the couplings 12, and the anchor pins 11 are driven in at a rate of one per 2 square meters of the slope to fix the gabion 1 to the anchor pins 11 (step S9).

According to the present embodiment described above, the heat insulating layer 220 is provided inside the gabion 1 . Therefore, frost heaving is less likely to occur on the ground on which the gabion 1 is installed. Therefore, the deterioration of the gabion 1 and the slope due to frost heave is suppressed. Therefore, the protection of slopes and the like is ensured. Also, the first permeable layer 210 is provided at a position closer to the ground than the heat insulating layer 220 . Without the first permeable layer 210 , it may be difficult to drain through the gabion 1 . On the other hand, in this embodiment, since the first permeable layer 210 is provided between the heat insulating layer 220 and the ground, the water seeping out from the ground is easily discharged through the first permeable layer 210 .

In addition, when the gabion 1 is transported, the frame is distorted by its own weight, and such deformation may reduce the function of the gabion 1 to protect the slope. On the other hand, the reinforcing members 151, 152, 161 and 162 are provided on the frame 100, thereby suppressing the deformation of the gabion 1. Therefore, the function of the gabion 1 is less likely to deteriorate. Furthermore, the deformation of the gabion 1 is further suppressed by the left and right width stoppers 170 and the front and rear width stoppers 180 . Therefore, the function of the gabion 1 is less likely to deteriorate.

Further, when transporting the gabion 1, it can be suspended by a crane or the like using the front suspension fitting 310 and the rear suspension fitting 320. At this time, since the front hanging metal fitting 310 and the rear hanging metal fitting 320 rotate around the connecting portions 313 and 323, the frame body 100 can be in a state of being obliquely inclined with respect to these hanging metal fittings. Therefore, it is easy to install the gabion 1 even on a slope such as a slope.

<Second embodiment>
A structure 500 according to a second embodiment, which is another embodiment of the present invention, will be described with reference to FIG. The structure 500 is constructed by combining a gabion 1' with a lock bolt 510. As shown in FIG. The gabion 1' has a through hole 500a formed in the center of the gabion 1 according to the first embodiment in a plan view, which vertically penetrates the frame 100 and the laminated body 200, and the other elements are the gabion. 1 in common. Note that the vertical direction in this embodiment is along the direction perpendicular to the slope, and the direction going deep into the ground is defined as the downward direction.

The lock bolt 510 has a rod 511 , a pressure receiving plate 512 and a fixture 513 . The rod 511 is a metal rod member having a male thread formed on its surface. The rod 511 penetrates through the through hole 500a of the gabion 1', is embedded in the ground, and is fixed to the ground by grout or the like. The upper end of the rod 511 protrudes above the gabion 1'. In addition, the inner surface of the through hole 500a may be reinforced by arranging a metallic cylindrical member or the like. The pressure-receiving plate 512 is a flat plate member made of metal and is arranged on the upper surface of the frame 100 . As a result, the pressure receiving plate 512 sandwiches the gabion 1' (bottom wall (bottom wall 126) of the frame 100) between itself and the slope. The fixture 513 is composed of a nut, a plate, or the like having a female screw portion that engages with the male screw portion of the rod 511 . The fixture 513 is attached to the rod 511 by engaging the female threaded portion of the fixture 513 with the male threaded section. The fixture 513 is tightened against the pressure receiving plate 512 from above. As a result, the pressure receiving plate 512 is pressed downward against the gabion 1'. The rock bolt 510 holds the slope stably by pressing the slope with the pressure receiving plate 512 through the gabion 1'.

As described above, in this embodiment, the gabion 1' to which the present invention is applied and the lock bolt 510 are used together. Since the gabion 1' suppresses frost heave on the slope, damage to the rock bolts 510 due to frost heave is suppressed.

<Third Embodiment>
A structure 600 according to a third embodiment, which is still another embodiment of the present invention, will be described with reference to FIG. The structure 600 is configured by combining the lock bolt 510 according to the second embodiment with the gabion 1''. The gabion 1'' has a through-hole 600a formed vertically through the ceiling wall (ceiling wall 125) of the frame 100 and the laminate 200 in the center of the gabion 1 according to the first embodiment in plan view. , and the other elements are common to the gabion 1. Note that the vertical direction in this embodiment is along the direction perpendicular to the slope, and the direction going deep into the ground is defined as the downward direction.

The entire upper structure of the lock bolt 510 according to this embodiment is arranged in the through hole 600a. The pressure-receiving plate 512 is arranged at the position of the heat-insulating layer 220 and the second permeable layer 230 in the vertical direction, and sandwiches the bottom wall (bottom wall 126) of the frame 100 with the slope. The fixture 513 is tightened against the pressure receiving plate 512 from above. As a result, the pressure receiving plate 512 is pressed downward against the surface of the slope. Since the pressure receiving plate 512 presses the slope surface, the lock bolt 510 can stably hold the slope surface.

As described above, in this embodiment, the gabion 1 ″ to which the present invention is applied and the lock bolt 510 are used together. Since the gabion 1 ″ suppresses frost heave on the slope, damage to the rock bolt 510 due to frost heave is suppressed.

<Modification>
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope described in the Means for Solving the Problems. It is possible.

For example, the first water permeable layer 210 according to the above embodiment allows water to pass along the direction in which the layer spreads (for example, the direction orthogonal to the stacking direction). On the other hand, instead of the first permeable layer 210, a permeable layer that allows water to pass along a direction that is inclined with respect to the direction in which the layer spreads may be used. In this way, the first permeable layer only needs to ensure the function of discharging water to the downward side of the slope surface by allowing water to pass in the direction intersecting the stacking direction.

Further, in the above-described embodiment, the gabion 1 is provided with the reinforcing members 151, 152, 161 and 162, and the left and right width stopping bars 170 and the front and rear width stopping bars 180. As shown in FIG. On the other hand, if a desired strength can be secured, some or all of these reinforcing members and width-stopping bars need not be provided. Alternatively, more reinforcing members and width stopping bars than in the above-described embodiments may be provided.

Further, in the above-described embodiment, the gabion 1 is produced on the flat ground under the slope, but it may be produced on the planned construction site on the slope or in the vicinity thereof.

In the above-described embodiment, one of the applications of the gabion 1 is assumed to be protection of slopes. you can

1, 1′, 1″ Gabion 100 Frame 120 Frame main body 121 to 126 Walls 151, 152, 161, 162 Reinforcement member 170 Left and right width fixing bars 180 Front and rear width fixing bars 200 Laminate 210 First water permeable layer 220 Thermal insulation Layer 230 Second water permeable layer 300 Suspension fitting 510 Rock bolt

Claims (6)

a mesh frame;
and a laminated body housed in the frame,
The laminate is, in order from the side closest to the ground,
a first water permeable layer capable of passing water in a direction intersecting with the stacking direction of the laminate;
a heat insulating layer made of a material having higher heat insulating properties in the stacking direction of the laminate than other layers;
A gabion characterized by comprising a second permeable layer capable of passing water in a direction intersecting with the lamination direction of the laminate and having a mass larger than that of the first permeable layer. The frame has a columnar shape defined by side walls, a ceiling wall and a bottom wall,
2. A gabion according to claim 1, wherein said frame is provided with reinforcing members extending along said side walls from said ceiling wall toward said bottom wall. At least two reinforcing members are provided so as to face each other in a direction perpendicular to the stacking direction,
3. A gabion according to claim 2, characterized in that it comprises a width tie bar having one end fixed to one of said two reinforcing members and the other end fixed to the other. A first arm extending along one side wall of the frame from the ceiling wall to the bottom wall of the frame, and a first arm extending along the side wall opposite to the one side wall from the ceiling wall to the bottom wall of the frame. and a hanging fitting having two arms and a connecting portion extending along the bottom wall from the end of the first arm on the bottom wall side to the end of the second arm on the bottom wall side. and
The gabion according to any one of claims 1 to 3, characterized in that the hanger is supported by the frame so as to be rotatable with respect to the frame around the connecting portion. . A plurality of gabions according to claim 4 are moved to the middle of the slope while being suspended by a suspension device using the hanging hardware, and arranged on the slope so that the gabions are closely adjacent to each other. A slope protection method characterized by: The gabion is provided with a pressure plate installed so as to sandwich the bottom wall of the frame and the ground,
6. The method for protecting a slope according to claim 5, wherein a lock bolt is driven into the ground and one end of said lock bolt is fixed to said pressure plate.

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