JP7211585B2 - Slope stabilization structure and slope stabilization method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a slope stabilization structure and a slope stabilization method, and more particularly to a slope stabilization structure and a slope stabilization method for preventing slippage and collapse of natural slopes and slopes.

Natural slopes and slopes such as cutting and filling (hereinafter collectively referred to as “slopes”) are susceptible to surface slides and slope failures because the ground becomes loose during periods of heavy rainfall. Concerned. Therefore, when constructing roads, railways, and other buildings around mountains, it is necessary to take measures to prevent slips and slope failures.

Many of the slopes of the ground are generally composed of a mobile layer (surface layer) 1 to several meters from the surface, which is easily weathered by rain, and an immovable layer (deep layer) such as bedrock that exists below. , a slope failure occurs in this moving layer.

Slope failures are mainly divided into two patterns. One is a phenomenon in which the mobile layer slides down the slope along the boundary surface (slip surface) between the mobile layer and the immovable layer and collapses, so-called surface slip. is. The other is a local collapse phenomenon in which a part of the surface layer falls off while the boundary surface is maintained, that is, so-called hollowing out.

Conventionally, as a slope stabilizing structure to prevent slope failure, generally, a grid-like slope frame made of concrete, mortar, etc. is formed on the slope, and anchors are placed at each intersection of the grid. used (for example, Patent Document 1).

In recent years, as a slope stabilization structure that does not use concrete or mortar sills, a net is laid on the entire surface of the slope for stabilization, and the net is attached to the slope by multiple anchors that are placed at intervals. A fixing structure is known (for example, Patent Document 2).

Furthermore, as a simpler construction method, a non-frame construction method that does not use a slope frame or a net is known. In the non-frame construction method, anchors are placed on a slope at appropriate intervals, a plate is attached to the heads of the anchors, and the heads of adjacent anchors are connected with wire ropes (for example, Patent Document 3). ).

In the conventional slope stabilization structure described above, multiple anchors are fixed to the immovable layer, and the anchors are connected to each other with a concrete frame or wire rope to constrain their movement. to prevent large-scale collapse of slopes.

JP-A-07-102574 Japanese Patent Application Laid-Open No. 2001-11863 JP-A-2002-173939

However, in the case of the slope structure and the structure using the net covering the slope, it was necessary to cut down standing trees on the natural slope, which led to the extension of the construction period. Furthermore, when concrete or mortar is cast on site, there is a problem that the construction period is longer and the construction cost increases.

On the other hand, the non-frame construction method using wire ropes does not require cutting trees or pouring concrete on site, so it is possible to shorten the construction period and reduce construction costs.

However, it is a structure in which anchors are connected with wire ropes, and there is no slope frame or net to hold down the ground slope, so there is a problem that local collapse of the slope in the surface layer cannot be sufficiently prevented.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. The purpose is to provide a chemical engineering method.

In order to achieve the above object, the slope stabilization structure according to claim 1 comprises:
a plurality of band-shaped nets laid in parallel at predetermined intervals on the slope so as to extend at least in the horizontal direction;
a plurality of anchors that are spaced apart in the direction of elongation of the web strip and pass through the web strip;
a plate attached to the head of the anchor for tensioning and fixing the band-like mesh against the slope from above;
a rod-shaped body arranged between the adjacent plates so as to overlap the strip-shaped net body and extending in the width direction of the strip-shaped net body ;
The rod-like body is separate from the belt-like mesh and has higher rigidity than the wires forming the meshes of the belt-like mesh. It is characterized by being attached to the side part .
Further, the invention according to claim 2 is the slope stabilization structure according to claim 1,
A rope-shaped or rod-shaped reinforcing member attached to the side part of the belt-shaped net body and extending in the extension direction of the belt-shaped net body,
The rod-shaped body has higher rigidity than the reinforcing member, and both ends of the rod-shaped body are attached to the reinforcing member.
Further, the invention according to claim 3 is the slope stabilization structure according to claim 1 or 2,
The band-like mesh is formed of wires made from hard steel wire rods.

According to this configuration, it is possible to prevent surface layer slippage of the slope by means of the plurality of anchors extending to the immovable layer. In addition, the surface layer is pressed down by a plurality of band-shaped net bodies that extend at least in the horizontal direction and are arranged side by side with a gap fixed to the slope by these anchors and plates, so that a part of the surface layer falls off. Collapse can be prevented. As a result, compared to the conventional non-frame construction method that uses wire ropes instead of frames, it is possible to hold down slopes over a wider area and appropriately prevent local collapse.

In addition, since it is configured to hold down the slope with a belt-shaped mesh body, compared to the conventional law frame structure that forms the law frame using concrete or mortar, the construction period is shortened and the construction cost is reduced. Furthermore, weight reduction can be achieved. In addition, even if there are standing trees on the natural slope, the band-shaped net body can be laid while avoiding the standing trees, so there is no need to cut down the standing trees. The construction period can be shortened and the construction cost can be reduced.
Further, according to this configuration, by maintaining the width dimension of the belt-shaped net by the rods, for example, the shape of the belt-shaped net is destroyed by the influence of wind and rain, and the pressing force of the mesh frame on the slope is reduced. can be prevented.

The invention according to claim 4 is the slope stabilization structure according to any one of claims 1 to 3 ,
A mesh frame in which the plurality of belt-shaped mesh bodies are laid in a grid pattern on a slope,
The anchors are positioned at intersections of the belt-like mesh.

According to this configuration, by laying the strip-like net bodies that extend linearly in a regular lattice pattern, the pressing force of the net-like frame necessary for preventing the surface layer from collapsing can be uniformly applied to the slope.

The invention according to claim 5 is the slope stabilization structure according to claim 4 ,
It is characterized by comprising a continuous loop-shaped reinforcing member attached to the side portion of the belt-like mesh body forming the grid opening of the mesh frame and surrounding the grid opening.

According to this configuration, the band-like net body is reinforced by the reinforcing member, the maximum tensile load of the net-like frame is increased, and the effect of suppressing local collapse of the slope can be enhanced. In addition, since the reinforcing member is attached to the side portion of the band-shaped net body, the tensile force of the reinforcing member can be effectively exerted upon local collapse.

The invention according to claim 6 is the slope stabilization structure according to any one of claims 1 to 5,
The plate is characterized in that it has at least one projection projecting from the lower surface and penetrating the mesh of the band-like mesh in the installed state.

According to this configuration, when an external force is applied to the belt-like net body and the belt-like net body is about to move, the protrusions provided on the plate are caught by the belt-like net body, and the movement of the belt-like net body is suppressed. It is possible to prevent the belt-like mesh from being dislocated.

In addition, the slope stabilization construction method according to claim 7,
A step of driving a plurality of anchors so that a plurality of rows of anchors arranged at intervals in the horizontal direction are formed on the slope at predetermined intervals in the vertical direction;
A step of laying a plurality of band-shaped net bodies in a parallel state at intervals on a slope so as to overlap at least the rows of the anchors and extend in the horizontal direction;
a step of attaching a plate to the head of the anchor and tensioning and fixing the band-shaped net body to the slope from above;
Before or after attaching the plate to the anchor, a rod-shaped body extending in the width direction of the strip-shaped net is overlapped with the laid strip-shaped net and arranged between the adjacent plates. a step of installing;
including
The rod-like body is separate from the belt-like mesh and has higher rigidity than the wires forming the meshes of the belt-like mesh. It is characterized by being attached to the side part .
Further, the invention according to claim 8 is the slope stabilization method according to claim 7,
A rope-shaped or rod-shaped reinforcing member extending in the extension direction of the strip-shaped net is attached to the side part of the strip-shaped net,
The rod-shaped body has higher rigidity than the reinforcing member, and both ends of the rod-shaped body are attached to the reinforcing member.

According to this configuration, it is possible to prevent surface layer slippage of the slope by means of the plurality of anchors extending to the immovable layer. In addition, the surface layer is pressed down by a plurality of band-shaped net bodies that extend at least in the horizontal direction and are arranged side by side with a gap fixed to the slope by these anchors and plates, so that a part of the surface layer falls off. Collapse can be prevented. As a result, compared with the conventional non-frame construction method using wire ropes, it is possible to enhance the effect of holding down the slope and appropriately prevent local collapse. In addition, it is possible to shorten the construction period, reduce the construction cost, and reduce the weight compared to the conventional law frame structure that forms the law frame using concrete or mortar. In addition, even if there are standing trees on the natural slope, the band-shaped net body can be laid while avoiding the standing trees, so there is no need to cut down the standing trees. The construction period can be shortened and the construction cost can be reduced.

Further, the invention according to claim 9 is the slope stabilization method according to claim 7 or 8 ,
The belt-shaped net is laid on a slope in a grid pattern, and the anchors are driven so as to be positioned at intersections of the belt-shaped net.

According to this configuration, by laying the strip-like net bodies that extend linearly in a regular lattice pattern, the pressing force of the net-like frame necessary for preventing the surface layer from collapsing can be uniformly applied to the slope.

According to the slope stabilization structure and the slope stabilization construction method of the present invention, it is possible to appropriately prevent the local collapse of the slope while shortening the construction period and reducing the construction cost.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows typically 1st Embodiment of the slope stabilization structure of this invention. The top view of a slope stabilization structure. FIG. 3 is an enlarged plan view of a main portion of FIG. 2; FIG. 3 is a sectional view taken along line IV-IV of FIG. 2; The perspective view explaining suppression of the local collapse by slope stabilization structure. The top view of the slope stabilization structure of 2nd Embodiment. 7 is a cross-sectional view taken along line VII-VII of FIG. 6; The perspective view which shows typically the slope stabilization structure of 3rd Embodiment. (a) A diagram showing another example of the mounting position of the reinforcing member, (b) is an enlarged view of the area surrounded by b in (a). (a) is a plan view showing another example of the plate, and (b) is a cross-sectional view taken along line bb of (a). The figure which shows the arrangement|positioning relationship of the plate shown in FIG. 9, and a strip|belt-shaped net body. The perspective view which shows the other example of a plate.

(First embodiment)
FIG. 1 is a perspective view schematically showing a first embodiment of a slope stabilization structure, FIG. 2 is a plan view of the slope stabilization structure, and FIG. 3 is an enlarged plan view of a main part of FIG. be. The slope stabilizing structure 10 is applied to slopes including natural slopes and slopes such as cuts and embankments to prevent collapse of the slopes. example.

The slope stabilization structure 10 includes a mesh frame 12 in which a plurality of belt-shaped mesh bodies 20 are laid in a grid pattern on a slope 80, and anchors 50 such as rock bolts positioned at intersections of the belt-shaped mesh bodies 20. , and a plate 52 attached to the head of the anchor 50 to fix the intersection of the webbing 20 against the ramp 80 . A reinforcing member 30 and a rod-shaped body 40 are attached to the band-shaped net body 20 .

The belt-like mesh 20 is formed by forming a mesh having a large number of meshes into a belt-like shape having a predetermined width and extending in one direction. The belt-like net body 20 has a predetermined width dimension so that a plurality of meshes are arranged in the width direction.

In the present embodiment, the band-shaped net body 20 is formed by weaving metal wires. For this wire, for example, a wire made from a hard steel wire specified in JIS G 3506, such as a hard steel wire (JIS G 3521) or a galvanized steel wire (JIS G 3548) can be used. A wire made from a hard steel wire rod is less likely to be plastically deformed than a wire made from a soft steel wire rod defined in JIS G 3505, and has high tensile strength and elasticity. The wire used has a wire tensile strength of 400 N/mm ² to 2,000 N/mm ² , preferably 1,000 N/mm ² to 2,000 N/mm ² . The diameter φ of the hard steel wire forming the wire is in the range of 2.6 mm to 4.0 mm, preferably 3.0 mm or more. The wire is preferably anti-corrosion treated, and an advantageous anti-corrosion treatment is to first plate the surface of the hard steel wire with Zn/Al, followed by a coating of saturated polyester (PET). be done. Other anti-corrosion treatments are also applicable. Moreover, the wire is not limited to a metal wire. For example, a wire made of carbon fiber, glass fiber, aramid fiber, or the like, or a highly corrosion-resistant resin wire can be used. Furthermore, a geogrid may be used as the band-like mesh 20 . When using a geogrid, it is laid along the slope 80 in a substantially planar manner.

The band-like mesh 20 of the present embodiment has rhombic meshes, and the size of the meshes is, for example, 50 to 150 mm in diagonal length on one side (the shorter one in FIG. 3) and 50 to 150 mm on the other side (the shorter one in FIG. (longer) can have a diagonal length of 50 to 200 mm. In addition, the mesh shape of the band-shaped mesh body 20 is not limited to this, and may be polygonal such as triangular, circular or elliptical. Moreover, it is good also as a mesh shape which combined these shapes.

A plurality of band-like net bodies 20 extend in the vertical direction (the vertical direction of the slope 80) and the horizontal direction (the direction substantially perpendicular to the vertical direction), and are laid in a rectangular lattice to form the mesh frame 12. Moreover, the band-shaped net body 20 is laid so as to pass between the standing trees 82 . As shown in FIG. 3(a), the vertically elongated belt-shaped mesh 21 and the horizontally elongated belt-shaped mesh 22 each have a rhombus-shaped mesh, and the long side of the rhombus-shaped mesh Each of the belt-like nets 21 and 22 is formed so that the diagonal line of the vertical line is the direction in which a high tensile force acts when a slope failure occurs. The direction is the horizontal direction in the horizontally elongated belt-like mesh 22 . Twisted binding portions 25 are formed at the ends of the shorter diagonal lines of the rhombus meshes located on the sides of the belt-like mesh 20, as shown in FIG. 3(b). , the annular portions of the two binding portions 25A and 25B are connected.

The size of one grid of the mesh frame 12 (i.e., the distance between the widthwise central positions of two adjacent longitudinal belt-shaped mesh bodies 21, and the distance between the widthwise central positions of two adjacent horizontal belt-shaped mesh bodies 22) distance) can be set as appropriate, and can be, for example, about 1 m to 3 m.

Note that the mesh frame 12 may have a structure in which the surface is coated with mortar or concrete.

A reinforcing member 30 and a rod-shaped body 40 are attached to each band-shaped net body 20 . The reinforcing member 30 is rope-shaped or rod-shaped, and is attached to at least one side portion of the band-shaped net body 20 so as to extend in the extension direction of the net body 20 . In this embodiment, as shown in FIG. 3, rope-like reinforcing members 30 are attached to both side portions of the band-shaped net body 20 .

The reinforcing member 30 can be formed of the same wire as the wire that constitutes the band-shaped net body 20 . In the present embodiment, the reinforcing member 30 is made of hard steel wire having a diameter larger than that of the wires forming the band-shaped net body 20 . The diameter φ of the hard steel wire forming the reinforcing member 30 is preferably in the range of 6.0 mm to 11 mm. The diameter may be the same as or smaller than that of the wires of the band-shaped net body 20, but by increasing the diameter, a higher tensile strength can be obtained. The reinforcement portion 30 is attached in a wavy entwined state so as to pass through the meshes of the band-shaped net body 20.例文帳に追加Although not shown, the reinforcing member 30 may be connected to the band-shaped net body 20 at a plurality of locations in the extending direction with a separate wire rod at predetermined intervals.

It is preferable that the reinforcing member 30 is stretched over the band-shaped net body 20 without slack. Here, "stretched without loosening" means that in a normal state in which the reinforcing member 30 is attached to the belt-shaped net body 20 and no tensile force is generated due to an external action such as a slope failure, the wire rope 30 does not have a tensile force. There is almost no or slight tensile force acting, and when a slope failure occurs, it is stretched to the extent that the tensile force acts immediately.For example, under normal conditions, the tensile stress of the reinforcing member 30 can be set to be zero or 5% or less of the breaking stress.

The rods 40 are for maintaining the width dimension of the belt-shaped net body 20 , extend in the width direction of the belt-shaped net body 20 , and have both ends attached to the side portions of the belt-shaped net body 20 . The rod-shaped body 40 can be made of, for example, a metal material or a resin material, and preferably has higher rigidity than the reinforcing member 30 . The attachment structure of both ends of the rod-shaped body 40 includes, for example, a structure in which a wire rod is passed through a through hole formed in the rod-shaped body 40 and tied to the band-shaped net body 20 or the reinforcing member 30, or a groove is formed in both ends of the rod-shaped body 40, A structure or the like in which the band-shaped net body 20 or the reinforcing member 30 is fitted in the groove can be adopted.

Anchors 50 are positioned at each intersection of the webbing 20 and extend to a lower non-moving layer 88 of the slip surface 85 in the ground, as shown in FIG.

The plate 52 is a plate material having a through-hole through which the anchor 50 is inserted, and is screwed onto the head of the anchor 50 in a state in which the vertically elongated belt-shaped net body 21 and the horizontally elongated belt-shaped net body 22 are sandwiched between the plate 52 and the slope 80 . It is fixed to the slope 80 by a nut 54 which The plate 52 can be formed of, for example, a steel plate, a resin plate in which a reinforcing material is embedded, or the like. In the illustrated example, a plate 52 having a smaller area than the crossing portion is installed approximately in the center of the crossing portion of the band-shaped net body 20, but the size of the plate 52 is not limited to this. It may be set to a size that covers almost the entire area. Although not shown, a cap covering the head of the anchor 50 and the nut 54 may be provided.

As shown in FIG. 3( a ), in the present embodiment, rods 40 are provided at the intersections of the vertically long belt-shaped net 21 and the horizontally long belt-shaped net 22 , and the rods 40 of the vertically long belt-shaped net 21 and the horizontally long The rods 40 of the band-shaped net body 22 are pressed against the slope 80 by the plate 52 and fixed in a crossed state.

Next, a construction method for the slope stabilization structure 10 described above will be described.

First, a plurality of anchors 50 are placed on the slope 80 at intervals so as to reach from the moving layer 86 which is the surface layer to the immovable layer 88 which is the lower layer than the sliding surface 85 . The anchors 50 are hammered so that a plurality of rows of the anchors 50 arranged at intervals in the horizontal direction (that is, rows in which the anchors 50 are arranged in the horizontal direction) are formed at predetermined intervals in the vertical direction. is set. Especially in this embodiment, the anchors 50 are arranged at predetermined intervals at intersections of the grid.

Next, a plurality of band-like net bodies 20 to which reinforcing members 30 are attached are laid in a grid pattern so that the placed anchors 50 are positioned at intersections to form the net-like frame 12 . Specifically, the vertically elongated belt-shaped net bodies 21 are laid in parallel at predetermined intervals so as to overlap the rows of the anchors 50 arranged in the vertical direction, and the horizontally elongated meshes 21 are laid in parallel so as to overlap the rows of the anchors 50 arranged in the horizontal direction. The band-like net bodies 22 are laid in parallel with a predetermined interval. The anchors 50 and the strip-shaped net body 20 are arranged so as to avoid standing trees 82 on the slope 80 , and the strip-shaped net body 20 extends between the standing trees 82 . After laying the strip-shaped net body 20, the rod-shaped body 40 can be attached to a desired location as required.

Next, the head of the anchor 50 protruding from the belt-like mesh 20 is passed through the through hole of the plate 52, and then the nut 54 is screwed to attach the plate 52 to the anchor 50. is tensioned and fixed against the slope 80 from above.

Thereafter, if necessary, mortar or concrete is sprayed onto the surface of the mesh frame 12 for coating. By performing such a coating, it is possible to obtain anticorrosive hardening of the band-shaped net body 20 .

Note that the reinforcing member 30 may be attached to the band-shaped net body 20 after laying it on the slope 80 and before or after attaching the plate 52 . Moreover, the rod-shaped bodies 40 arranged between the intersections of the mesh frame 12 may be installed after the plates 52 are attached.

Next, the operation of the slope stabilization structure 10 described above will be described.

As shown in FIG. 4 , against surface layer slip (slip indicated by white arrows) in which the moving layer 86 slides downward along the slope 80 along the sliding surface 85 , the moving layer 86 is penetrated and fixed to the immovable layer 88 . Pull-out resistance of the plurality of anchors 50, that is, shear force acting on the anchors 50 when a load acts on the downward slope 80, etc., generates a tensile force on the anchors 50 when the moving layer 86 tries to slide, This suppresses the occurrence of slippage.

As shown in FIG. 5, the surface layer is pressed down by the tensile force of the mesh frame 12 fixed to the slope 80 against the dropout of the part 87 of the moving layer 86 while the sliding surface 85 is maintained. This suppresses the occurrence of voids. In addition, the mesh frame 12 as a whole can prevent a relatively large collapse of the surface layer. can work. Furthermore, since the roots of the standing trees 82 within the mesh of the mesh frame 12 hold down the surface layer, it is possible to effectively suppress small collapses occurring within the mesh.

In this way, the slope stabilization structure 10 using the mesh frame 12 can effectively prevent both surface slippage and hollowing out, and compared to the conventional slope structure using concrete, the construction It is possible to shorten the period and reduce the construction cost. In addition, since the mesh frame 12 is formed of the band-shaped mesh body 20, it is more durable against erosion due to rain or the like than the concrete slope frame. Further, even if there is a standing tree 82 on the slope 80, the band-shaped net body 20 can be laid in a lattice shape while avoiding the standing tree 82. - 特許庁In particular, unlike a concrete frame, the belt-shaped net body 20 has high flexibility and is excellent in workability, so it is easy to avoid standing trees 82 . In addition, since there is no need to cut down the standing trees 82, compared to the conventional net structure that covers the entire slope 80 with a net, the construction period can be shortened and the construction costs can be reduced, and the standing trees 82 can be used to prevent slope failures. It is possible to

Furthermore, in the slope stabilization structure 10 of the present embodiment, by reinforcing the belt-like mesh body 20 with the rope-shaped reinforcing member 30, the maximum tensile load of the mesh frame 12 is increased, and the local collapse of the slope 80 is suppressed. can increase In addition, since the width of the belt-shaped net body 20 is maintained by the rods 40, for example, the shape of the belt-shaped net body 20 may be lost due to the influence of wind and rain, and the pressing force of the mesh frame 12 on the slope may be reduced. can be prevented.

(Second embodiment)
Next, a second embodiment of the slope stabilization structure 10 will be described with reference to FIGS. 6 and 7. FIG. In addition, in FIGS. 6 and 7, the same reference numerals are given to the parts corresponding to those in the first embodiment. Further, in the second embodiment described below, detailed description of the same configuration as that of the first embodiment will be omitted.

In the present embodiment, the strip-shaped net body 20 constituting the net-like frame 12 includes a plurality of horizontally long strip-shaped net bodies 22 extending in the horizontal direction and a plurality of first belt-shaped net bodies 22 extending in an oblique direction (a direction crossing the vertical and horizontal directions). It includes a slanted mesh strip 23 and a second slanted mesh strip 24 . The first inclined strip-shaped net body 23 and the second inclined strip-shaped net body 24 extend in directions intersecting each other, and the net-like frame 12 is formed into a substantially triangular shape by the strip-shaped net bodies 22, 23, and 24 extending in three directions. It is formed in a triangular lattice shape with a mesh.

Anchors 50 are driven at the intersections of the strip-shaped net bodies 22, 23, and 24, and a plate 52 for fixing the strip-shaped net body 20 to the slope 80 with a nut 54 is attached to the head of the anchor 50. ing.

In addition, it is possible to attach reinforcing members 30 to the side portions of each of the horizontally elongated belt-shaped nets 22, the first inclined belt-shaped nets 23, and the second inclined belt-shaped nets 24. As shown in FIG. In addition, rod-shaped bodies 40 for maintaining the width dimensions of the strip-shaped net bodies 22, 23, 24 can be appropriately installed.

In the slope stabilization structure 10 of the present embodiment, the same effect as in the first embodiment can be obtained, and the anchors 50 positioned at the intersections of the belt-shaped net bodies 20 are arranged in a zigzag pattern. It is easy to construct by avoiding standing trees 82. - 特許庁

(Third Embodiment)
Next, a third embodiment of the slope stabilization structure 10 will be described with reference to FIG. In addition, in FIG. 8, the same reference numerals are given to the parts corresponding to those in the first embodiment. Further, in the third embodiment described below, detailed description of the same configuration as that of the first embodiment will be omitted.

In the present embodiment, the belt-shaped net bodies 20 are laid in parallel with a gap in the vertical direction so as to extend in the horizontal direction of the slope 80 . A plurality of anchors 50 are arranged at intervals in the direction of elongation of the belt-shaped net body 20 while penetrating the belt-shaped net body 20, and the belt-shaped net body 20 is attached to the head of the anchor 50 using a nut 54. The plate 52 is clamped against the slope 80 from above.

Thus, even if the belt-like net body 20 does not form a frame structure and extends only in the lateral direction, the plurality of anchors 50 can prevent the slope 80 from slipping on the surface layer. Since the surface layer is pressed by the band-like mesh 20, the slope 80 can be prevented from collapsing locally. In particular, the belt-like net body 20 extending in the horizontal direction can effectively prevent a part of the surface layer from falling down the slope. It should be noted that it is possible to attach rod-shaped bodies 40 and reinforcing members 30 (not shown) to the band-shaped net body 20 .

(Modification 1)
Next, another example of the mounting position of the reinforcing member will be described with reference to FIG. As indicated by the chain double-dashed lines in FIG. 9( a ), the reinforcing member 32 of the modified example is attached in a continuous loop shape to the side portion of the belt-like mesh body 20 in a manner surrounding the grid openings 28 of the mesh frame 12 . Here, the term "continuous loop shape" means a loop shape formed by tying one or two or more string-like reinforcing members. In the illustrated example, rope-shaped reinforcing members 32 are provided in a square shape along the square lattice openings 28 . In addition, the reinforcing member 32 is made of a material having low elastic performance and being difficult to expand and contract, such as a metal material, so that the length of the loop remains substantially unchanged and the lattice openings 28 can be maintained when the reinforcing member 32 receives a required tensile force. etc. is preferably formed. As shown in FIG. 9(b), the reinforcing member 32 is attached in a wave-like entwined state so as to pass through the respective meshes of the vertically elongated belt-shaped mesh 21 and the horizontally elongated belt-shaped mesh 22. As shown in FIG. Although not shown, it is also possible to attach the reinforcing member 32 to the mesh frame 12 having the triangular lattice openings shown in the second embodiment so as to surround the lattice openings. . The reinforcement members 32 are installed along the grid openings 28 after the mesh frame 12 is laid.

By arranging the reinforcing member 32 in such a manner as to surround the grid opening 28 , it is possible to prevent the width of the belt-shaped net body 20 from narrowing when a tensile force acts on the belt-shaped net body 20 . Although not shown, the slope stabilization structure 10 can be configured to include both the reinforcing member 32 of this modified example and the reinforcing member 30 of the first embodiment.

(Modification 2)
Next, another example of the plate will be described with reference to FIGS. 10 and 11. FIG. The plate 60 of this modification includes a plate body 62 made of a substantially cross-shaped flat plate, a through hole 64 formed in the center of the cross, and a plurality of projections 66 projecting from one surface of the plate body 62. Prepare. One or more protrusions 66 are preferably provided in each of the extensions 63 extending in four directions from the central portion of the plate body 62. In this modification, each extension 63 has three protrusions 66. formed.

The plate 60 is installed so that the surface on which the protrusions 66 are provided is the lower surface (that is, the surface facing the slope 80 ), and the head of the anchor 50 is inserted through the through hole 64 . As shown in FIG. 11 , each protrusion 66 is arranged to penetrate the meshes of the superimposed vertically elongated belt-shaped mesh bodies 21 and horizontally elongated belt-shaped mesh bodies 22 at the intersections of the meshed frame 12 . The plate 60 can be made of metal material or resin material.

In this plate 60, when an external force is applied to the strip-shaped mesh 20 and the strip-shaped mesh 20 is about to move, for example, the relative positions of the vertical strip-shaped mesh 21 and the horizontal strip-shaped mesh 22 are displaced, the plate-shaped mesh 20 may not move. The protrusions 66 are caught by the wires forming the belt-shaped net body 20 and engage with it, so that the movement of the belt-shaped net body 20 is restrained. This makes it possible to prevent the belt-shaped net body 20 from being displaced.

(Modification 3)
Next, still another example of the plate will be described with reference to FIG. The plate 60 of this modified example includes a plate body 62, a through hole 64, and a plurality of protrusions 66 similar to those described in the second modified example. It has a tubular body 67 protruding from the surface opposite to the surface) and communicating with the through hole 64 , and a plurality of ribs 68 provided on the upper surface of the plate body 62 . The rib 68 is provided on each extending portion 63 , protrudes from the upper surface of the plate body 62 , and has a plate shape extending from the cylindrical body 67 of the plate body 62 toward the tip of the extending portion 62 . The height of the rib 68 is formed so as to increase from the distal end of the extending portion 63 toward the proximal end.

In the plate 60 of this modified example, the plate 60 is fixed to the slope by screwing the nut 54 onto the top of the cylindrical body 67 while the head of the anchor 50 is inserted through the through hole 64 and the cylindrical body 67. be. The cylindrical body 67 and ribs 68 of the plate 60 may be made of the same material as the plate body 62 and the protrusions 66, or may be made of a different material. For example, the plate body 62 and the protrusions 66 can be made of a resin material, and the cylindrical body and the ribs 68 can be made of a metal material. It is possible to prevent the metal wires forming the body 20 from contacting and rubbing against the plate body 62 and peeling off the coating layer of the wires.

In addition, in the plate 60 of Modified Examples 2 and 3, the plate body 62 may be formed not in a cross shape but in a substantially rhombic shape as indicated by the imaginary line 69 in FIG. 12 . By increasing the area of the plate body 62 in this way, the pressing force of the plate 60 can be increased, and the slope protection effect can be enhanced.

It should be noted that the present invention is not limited to the above-described embodiments and modifications, and can be modified in various ways without departing from the scope of the invention.

For example, the mesh frame 12 is not limited to the belt-like mesh 20 laid out in the shape of a square grid or a triangular grid, but may be laid out in the shape of other polygonal grids.

REFERENCE SIGNS LIST 10 slope stabilization structure 12 mesh frame 20 belt-like mesh 30, 32 reinforcing member 40 bar 50 anchor 52, 60 plate 54 nut 80 slope 82 standing tree 85 sliding surface 88 nonmoving layer

Claims (9)

a plurality of band-shaped nets laid in parallel at predetermined intervals on the slope so as to extend at least in the horizontal direction;
a plurality of anchors that are spaced apart in the direction of elongation of the web strip and pass through the web strip;
a plate attached to the head of the anchor for tensioning and fixing the band-like mesh against the slope from above;
a rod-shaped body arranged between the adjacent plates so as to overlap the strip-shaped net body and extending in the width direction of the strip-shaped net body ;
The rod-like body is separate from the belt-like mesh and has higher rigidity than the wires forming the meshes of the belt-like mesh. A slope stabilization structure, characterized in that it is attached to a side part . A rope-shaped or rod-shaped reinforcing member attached to the side part of the belt-shaped net body and extending in the extension direction of the belt-shaped net body,
The slope stabilizing structure according to claim 1, wherein the rod-shaped body has higher rigidity than the reinforcing member, and both ends of the rod-shaped body are attached to the reinforcing member. The slope stabilizing structure according to claim 1 or 2, wherein the band-like net body is formed of wires made from hard steel wire rods. A mesh frame in which the plurality of belt-shaped mesh bodies are laid in a grid pattern on a slope,
The slope stabilization structure according to any one of claims 1 to 3 , wherein the anchors are positioned at intersections of the belt-like mesh. 5. The slope stabilization of claim 4 , further comprising a continuous loop reinforcing member attached to the sides of said mesh strips forming grid openings of said mesh frame and surrounding said grid openings. structure. The slope stabilizing structure according to any one of claims 1 to 5, wherein the plate has at least one projection projecting from the bottom surface and penetrating the mesh of the belt-like mesh in an installed state. . A step of driving a plurality of anchors so that a plurality of rows of anchors arranged at intervals in the horizontal direction are formed on the slope at predetermined intervals in the vertical direction;
A step of laying a plurality of band-shaped net bodies in a parallel state at intervals on a slope so as to overlap at least the rows of the anchors and extend in the horizontal direction;
a step of attaching a plate to the head of the anchor and tensioning and fixing the band-shaped net body to the slope from above;
Before or after attaching the plate to the anchor, a rod-shaped body extending in the width direction of the strip-shaped net is overlapped with the laid strip-shaped net and arranged between the adjacent plates. a step of installing;
including
The rod-like body is separate from the belt-like mesh and has higher rigidity than the wires forming the meshes of the belt-like mesh. A slope stabilization construction method characterized by being attached to a side part . A rope-shaped or rod-shaped reinforcing member extending in the extension direction of the strip-shaped net is attached to the side part of the strip-shaped net,
8. The slope stabilization construction method according to claim 7, wherein the rod-shaped body has a rigidity higher than that of the reinforcing member, and both ends of the rod-shaped body are attached to the reinforcing member. 9. The slope stabilization work according to claim 7 or 8 , wherein the belt-shaped net is laid on the slope in a grid pattern, and the anchors are driven so as to be positioned at intersections of the belt-shaped net. law.

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