Rockfall prevention structure on slopes

Abstract

To provide a structure for guiding falling rocks on a slope, capable of protecting various facilities by safely and surely guiding falling rocks on the slope downward, and moreover, capable of being easily constructed at low cost. [Solution] A rockfall guide structure 10 for a slope is constituted by a cylindrical body 1 having multiple holes in the body, a fixing member for fixing the cylindrical body 1 to a slope S with one opening 2 of the cylindrical body 1 positioned near a rockfall source A on the slope S and the other opening 3 positioned below the slope, and a bottom cover 5 for closing the other opening 3 of the cylindrical body 1 in an openable and closable manner.

Description

[Technical field]

[0001] The present invention relates to a rockfall guide structure for a slope, and more particularly to a rockfall guide structure for a slope that guides falling rocks generated at a rockfall source on a slope down the slope. [Background technology]

[0002] Conventionally, measures to prevent rockfalls on natural slopes such as mountainsides have included rockfall prevention measures to prevent rockfalls from occurring at the rockfall source, and rockfall protection measures to wait for falling rocks at the rockfall source and stop their movement or guide them downward or to the side.

[0003] The pocket rock net method, a representative example of a rockfall protection measure, is a method that can protect against rockfalls from above a slope by creating an opening (pocket) at the top that serves as an entrance for falling rocks and covering the lower part of the slope with a wire mesh (rock net) (see, for example, Patent Document 1 below).

[0004] However, because this pocket-type rock net method was basically a measure constructed downslope near roads and other facilities to be protected, for example, when the source of falling rocks was located high up on the slope, the opening height and width of the pocket had to be large in order to reliably capture the falling rocks that fly down the slope while spreading out in the direction of the width of the slope, with considerable kinetic energy from above.In addition, the area of ​​the rock net that guides the captured falling rocks down the slope had to be large, which posed the drawback of significantly increasing construction costs.

[0005] In addition, the pillars that maintain the opening of the pocket must be sturdy enough to withstand direct hits from rocks falling from high up, and shock mitigation equipment must be installed, which not only increases construction costs but also makes the construction work difficult. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3222949 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above-mentioned drawbacks of conventional measures to prevent rockfall on slopes, and has as its object to provide a rockfall guide structure for slopes which can safely and reliably guide falling rocks down the slope to protect various facilities such as roads, even when the source of the rockfall is located at a high point on the slope, and which can be easily constructed at low cost. [Means for solving the problem]

[0008] The present invention relates to a rockfall guide structure for guiding rocks falling from a rockfall source on a slope down the slope, the rockfall guide structure comprising a cylindrical body having openings at both ends and a number of holes in a body, one opening of the cylindrical body being positioned near the rockfall source and the other opening being positioned below the slope. The cylindrical body is placed on the inclined surface. The device is characterized in that it is equipped with a fixing member that fixes the cylindrical body to the slope in an open state, and a bottom cover that closes the other opening of the cylindrical body in an openable and closable manner, and the rocks taken in from the one opening of the cylindrical body are allowed to fall inside the cylindrical body having the hole, and the kinetic energy of the rocks is absorbed while they are guided to the other opening of the cylindrical body.

[0009] The present invention is also characterized in that it includes a guide for guiding falling rocks generated at the rockfall source to the one opening of the cylindrical body.

[0010] In the present invention, the cylindrical body is made of a mesh body having a large number of meshes. Effect of the Invention

[0011] According to the rockfall guidance structure for slopes of the present invention, falling rocks generated at the rockfall source can be captured into one opening of the cylindrical body before the rocks spread out in the width direction of the slope with great kinetic energy and fly down the slope, and there is no need to make the one opening of the cylindrical body sturdy enough to withstand the impact of a large rockfall or to attach impact mitigation equipment, and the structure can be easily constructed at low cost.

[0012] In addition, rocks taken in through one opening of the cylindrical body can be allowed to fall within the cylinder and reliably guided to the other opening of the cylindrical body where they can be accumulated, and there is no need to significantly extend the installation length in the slope width direction to accommodate the spreading of rocks in that direction, which also makes construction easy and low cost.

[0013] In addition, because the cylindrical body has many holes, the kinetic energy of the falling rocks can be gradually absorbed by collisions with the edges of each hole, while being guided to the other openings of the cylindrical body, and then stopped safely and securely by the bottom lid. Therefore, it is not necessary to make the other openings of the cylindrical body or the bottom lid sturdy enough to receive falling rocks with large kinetic energy, or to attach shock mitigation equipment, which also allows for easy construction at low cost. [Brief description of the drawings]

[0014] [Figure 1] 1 is a partial perspective view of a cylindrical body in a rockfall guiding structure for a slope according to the present embodiment. FIG. [Diagram 2] FIG. 2 is an overall side view of the slope rockfall guiding structure of the present embodiment. [Diagram 3] FIG. 2 is an overall bird's-eye view of the slope rockfall guidance structure of the present embodiment. [Figure 4] FIG. 2 is a partial side view showing the rock removal operation of the slope rockfall guiding structure of this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] As shown in Figures 1 to 3, the rockfall guidance structure 10 for slopes in this embodiment is composed of a cylindrical body 1 with openings (2, 3) at both ends, a fixing member 4 for fixing the cylindrical body 1 to a slope S such as a mountainside, a bottom cover 5 for closing the lower opening 3 of the cylindrical body 1 in an openable and closable manner, and a guide 6 for guiding falling rocks to the upper opening 2 of the cylindrical body 1.

[0016] As shown in FIG. 1, the cylindrical body 1 has a first opening 2 and another opening 3 at both ends in the longitudinal direction, and has many holes 11, 11, ... in the body. The cylindrical body 1 of this embodiment is made of a metal mesh body having many meshes, and has a long rectangular tube shape with an opening height of about 1 m and an opening width of about 1 m. Metal reinforcing frames 21, 31 are provided at the opening edges of the first opening 2 and the other opening 3. In addition to the metal mesh body, the cylindrical body 1 can be made of any suitable material, such as expanded metal, a mesh surface material formed by joining steel wires together in a vertical and horizontal lattice pattern, or a synthetic resin mesh body. The cylindrical body 1 may be made by connecting a plurality of cylinders made of these various materials in series as necessary.

[0017] The fixing members 4 in this embodiment are composed of fasteners 41 fixed to the outer surface of the cylindrical body 1 and well-known anchors (not shown), and a plurality of fixing members 4 are provided at predetermined intervals on the reinforcing frame (21·31) and trunk of the cylindrical body 1. Note that a well-known wire rope may also be used as the fixing members 4.

[0018] The bottom cover 5 in this embodiment is made of a square steel plate, and is attached to the reinforcing frame 31 of the other opening 3 of the cylindrical body 1 via a hinge 51 so as to be openable and closable. The reinforcing frame 31 is provided with a well-known fastening means (not shown) consisting of a removable plug pin or the like, which can fasten the bottom cover 5 in the closed state. In addition to the steel plate, the bottom cover 5 can be made of any suitable material, such as a metal mesh, a synthetic resin mesh, expanded metal, or a mesh-like surface material formed by joining steel wires together in a vertical and horizontal lattice pattern.

[0019] 2, the guide 6 of this embodiment is composed of a support 61 fixed to the slope S, and a surface material 62 made of a mesh body provided between the support 61 and the reinforcing frame 21 of the first opening 2 of the cylindrical body 1. The guide 6 is installed in a funnel shape to guide rocks falling from the rockfall source A to the first opening 2 of the cylindrical body 1 without receiving the rocks. In addition to the mesh body, the surface material 62 of the guide 6 can be appropriately made of, for example, expanded metal, a mesh-like surface material made of steel wires joined together in a vertical and horizontal lattice pattern, or a plate material without holes.

[0020] As shown in FIG. 2 and FIG. 3, the rockfall guide structure 10 for a slope of the present embodiment has one opening 2 of a cylindrical body 1 located near a rockfall source A on a slope S, and another opening 3 located below the slope. The cylindrical body 1 is placed on the inclined surface S. In this state, the cylindrical body 1 is fixed to a slope S and a guide 6 is installed in one of the openings 2, whereby the structure is installed on a slope S where there is a risk of rockfall accidents.

[0021] In the slope fall guide structure 10 of this embodiment, when a rockfall occurs at the rockfall source A, the fallen rock is guided by the guide 6 into one opening 2 of the cylindrical body 1, the captured fallen rock falls inside the cylindrical body 1, and is guided to another opening 3 provided with a bottom cover 5 below the slope, where it is accumulated inside the cylinder. In this way, facilities B such as a road below the slope are protected.

[0022] As shown in Fig. 4, the bottom cover 5 of the other opening 3 of the cylindrical body 1 is opened as necessary to appropriately discharge the fallen rocks R accumulated inside the cylinder, thereby performing maintenance work such as rock removal. Note that the rockfall guiding structure 10 for a slope of this embodiment can also be used in combination with an existing well-known rockfall protection retaining wall W or rockfall protection fence F, as shown in Figs. 2 and 3.

[0023] Thus, according to the slope falling rock guidance structure 10 of this embodiment, the first opening 2 of the cylindrical body 1 is located near the rockfall source A of the slope S, so that a rockfall generated at the rockfall source A can be captured into the first opening 2 of the cylindrical body 1 before the rockfall spreads in the slope width direction with a large kinetic energy and jumps down the slope. Therefore, it is not necessary to make the first opening 2 of the cylindrical body 1 and the guide 6 sturdy enough to withstand a large rockfall impact like the supports of the conventional pocket-type rock net construction method or rockfall protection fence, or to attach impact mitigation equipment, and construction can be easily performed at low cost.

[0024] Moreover, according to the slope falling rock guide structure 10 of this embodiment, the falling rocks taken in from one opening 2 of the cylindrical body 1 are allowed to fall inside the cylindrical body 1, so that the falling rocks can be reliably guided to a predetermined place on the slope where the other opening 3 of the cylindrical body 1 is located while controlling the direction of the falling rocks, and can be accumulated there. Therefore, unlike the conventional pocket-type rock net construction method and rockfall protection fence, there is no need to take a large installation extension in the slope width direction to accommodate the spread of falling rocks in the slope width direction, and this also makes it easy to install at low cost. In addition, since the falling rocks can be reliably accumulated in the predetermined place, maintenance work such as stone removal can be performed safely and easily.

[0025] Furthermore, according to the rockfall guidance structure 10 for a slope of this embodiment, the cylindrical body 1 has many holes 11, so that rockfalling inside the cylindrical body 1 can be repeatedly collided with the hole edges of each hole 11, and the kinetic energy of the rockfall can be gradually absorbed while being guided to the other opening 3 of the cylindrical body 1, where it can be safely and securely stopped by the bottom cover 5. Therefore, it is not necessary to make the other opening 3 and bottom cover 5 of the cylindrical body 1 sturdy enough to receive rockfalls with large kinetic energy like conventional rockfall protection retaining walls or rockfall protection fences, or to attach impact mitigation equipment, which also allows for easy construction at low cost.

[0026] In addition, according to the slope rockfall guidance structure 10 of this embodiment, the cylindrical body 1 has a large number of holes 11, so that the condition inside the cylinder can be safely and easily visually observed from the outside of the cylindrical body 1 through each hole 11, and fallen rocks accumulated inside the cylinder can be safely excavated from the outside of the cylindrical body 1 through each hole 11 using a rock drill or the like, so that maintenance work such as stone removal can be performed safely and easily.

[0027] In addition, according to the slope falling rock guide structure 10 of this embodiment, the cylindrical body 1 is made of a mesh body having many meshes, so it is relatively light and can be curved relatively easily in the longitudinal direction. Therefore, the degree of freedom of installation on the slope S is high, and for example, as shown in Fig. 3, the cylindrical body 1 can be easily installed along the stream or valley of the slope S depending on the situation, and the workability is excellent.

[0028] Furthermore, according to the structure for guiding falling rocks on a slope 10 of this embodiment, the fallen rocks accumulated inside the cylindrical body 1 can be securely held inside the cylinder. Therefore, if necessary, the slope S can be stabilized by accumulating the fallen rocks in part or all of the longitudinal direction of the cylindrical body 1 with the bottom cover 5 closed. In other words, the structure for guiding falling rocks on a slope 10 of this embodiment can also be used as a stabilization measure for the slope, like a well-known gabion. The stabilization of the slope by the cylindrical body 1 that contains the fallen rocks is particularly effective when a pile of fallen rocks has already formed along the stream or valley of the slope where rockfall prevention measures are required.

[0029] Although the falling rocks guide structure 10 for a slope according to the present embodiment has been described above, the present invention can be embodied in other embodiments.

[0030] For example, in the above embodiment, as shown in Fig. 2, one opening 2 of the cylindrical body 1 is located near the rockfall source A located at a high point on the slope S, and the other opening 3 is located at the bottom of the slope S, but the present invention is by no means limited to this, and for example, the one opening 2 of the cylindrical body 1 may be located near the rockfall source A located in the middle of the slope S. In addition, it is sufficient for the other opening 3 of the cylindrical body 1 to be located lower than the one opening 2, and it may be located not only at the bottom of the slope S, but also in the middle of the slope, such as in a gently sloping portion of the slope.

[0031] In the above embodiment, the inner diameter and cross-sectional shape of the cylindrical body 1 are uniform over the entire length, but for example, the diameter of the first opening 2 and the other opening 3 of the cylindrical body 1 may be made larger than that of the trunk, or the opening shape may be made different from that of the trunk. Various design modifications are possible depending on the rockfall conditions of the slope S and the rockfall source A.

[0032] The present invention may be embodied in various other forms that include improvements, modifications, and variations based on the knowledge of a person skilled in the art, without departing from the spirit of the present invention. In addition, the present invention may be embodied in a form in which any of the invention-specifying matters is replaced with other techniques within the scope of the same action or effect, and an invention-specifying matter that is integrally configured may be composed of multiple members, or an invention-specifying matter that is composed of multiple members may be embodied in a form in which it is integrally configured. [Explanation of symbols]

[0033] 10. Rockfall prevention structures on slopes 1. Cylindrical body 11 Hole 2. One opening (of a cylindrical body) 3. Other openings (of a cylindrical body) 4 Fixing member 5 Bottom lid 6 Guide S slope A. Rockfall source

Claims

1. A rockfall guide structure that guides rockfalls generated at a rockfall source on a slope down the slope, A cylindrical body having openings at both ends and a large number of holes in a body portion; a fixing member for fixing the cylindrical body to the slope in a state where one opening of the cylindrical body is positioned near the rockfall source and the other opening is positioned below the slope, and the cylindrical body is placed on the slope; a bottom cover for closing the other opening of the cylindrical body in an openable and closable manner; Equipped with A rockfall guiding structure for a slope, characterized in that falling rocks taken in through one opening of the cylindrical body are allowed to fall within the cylindrical body having the hole, and are guided to the other opening of the cylindrical body while absorbing the kinetic energy of the falling rock.

2. 2. The rockfall guiding structure for a slope according to claim 1, further comprising a guide for guiding falling rocks generated at the rockfall source to the first opening of the cylindrical body.

3. 3. A rockfall guide structure for a slope according to claim 1 or 2, characterized in that the cylindrical body is made of a mesh body having a large number of meshes.

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