Rock fall guiding structure for slope

Abstract

To provide a rock fall guiding structure for a slope, which can protect various facilities by safely and surely guiding rock falls on the slope downward, and which can be easily constructed at a low cost.SOLUTION: This rock fall guiding structure 10 for the slope is composed of a cylindrical body 1 having a large number of hole parts in a trunk part, a fixing member for fixing the cylindrical body 1 to the slope S in a state of positioning one opening part 2 of this cylindrical body 1 in the vicinity of a rock fall generation source A of the slope S and positioning the other opening part 3 under the slope, and a bottom cover 5 for openably closing the other opening part 3 of the cylindrical body 1.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a rockfall guidance structure for slopes, and more particularly to a rockfall guidance structure for slopes 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 been taken, including 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 typical example of a rockfall protection measure, is a method that responds to 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, this pocket-type rock net construction method was basically a measure to be constructed on the downslope near roads and other facilities to be protected. Therefore, for example, if the source of falling rocks is located high up on the slope, the falling rocks will fly down the slope, carrying considerable kinetic energy from high up, and will spread out in the direction of the slope width. In order to reliably capture these falling rocks in the pocket, the opening height and width of the pocket must be made large. In addition, the area of ​​the rock net that guides the captured falling rocks down the slope must also be large, which has the drawback of significantly increasing construction costs.

[0005] In addition, the supports that maintain the opening of the pocket must be made sturdy enough to withstand direct hits from falling rocks from high places, and shock-absorbing 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 against falling rocks on slopes, and aims to provide a rockfall guide structure for slopes that can safely and reliably guide falling rocks down the slope to protect various facilities such as roads, even when the source of the falling rocks is located high up on the slope, and that can be easily constructed at low cost. [Means for solving the problem]

[0008] The present invention is a rockfall guidance structure that guides falling rocks generated at a rockfall source on a slope down the slope, and is characterized by comprising a cylindrical body with openings at both ends and a number of holes in its body, a fixing member that fixes the cylindrical body to the slope with one opening of the cylindrical body positioned near the rockfall source and the other opening positioned below the slope, and a bottom cover that closes the other opening of the cylindrical body in an openable and closable manner, and that causes falling rocks taken in through the one opening of the cylindrical body to fall within the cylindrical body having the holes, and guides the falling rock to the other opening of the cylindrical body while absorbing the kinetic energy of the falling rock.

[0009] The present invention is also characterized by including a guide for guiding falling rocks generated at the rockfall source to the first opening of the cylindrical body.

[0010] In addition, the present invention is characterized in that the cylindrical body is made of a mesh body having a large number of meshes. [Effects of the Invention]

[0011] According to the rockfall guidance structure for slopes of the present invention, rocks falling from the rockfall source can be captured into one opening of the cylindrical body before they 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 large rockfalls or to install impact mitigation equipment, so the structure can be easily constructed at low cost.

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

[0013] In addition, because the cylindrical body has many holes, the kinetic energy of falling rocks can be gradually absorbed by collisions with the edges of each hole, and the rocks can be guided to other openings in the cylindrical body and safely and securely stopped by the bottom cover. Therefore, it is not necessary to make the other openings in the cylindrical body or the bottom cover sturdy enough to receive falling rocks with large kinetic energy, or to install impact mitigation equipment, which also makes construction easy and low cost. [Brief explanation of the drawings]

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

[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 a second opening 3 at each end in the longitudinal direction, and a number of holes 11, 11, ... in the body. The cylindrical body 1 of this embodiment is made of a metal mesh with multiple meshes and has a long, rectangular cylindrical shape with an opening height of approximately 1 m and an opening width of approximately 1 m. Metal reinforcing frames 21, 31 are provided at the edges of the first opening 2 and the second opening 3. As a material for the cylindrical body 1, in addition to the metal mesh, other suitable materials may be used, such as expanded metal, a mesh-like surface material formed by joining steel wires together in a vertical and horizontal grid pattern, or a synthetic resin mesh. The cylindrical body 1 may also be constructed by connecting multiple cylinders made of these various materials in series, as needed.

[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 multiple fixing members 4 are provided at predetermined intervals on the reinforcing frame (21, 31) and trunk of the cylindrical body 1. Note that well-known wire ropes may also be used as fixing members 4.

[0018] The bottom cover 5 of this embodiment is made of a square steel plate and is attached to a reinforcing frame 31 of the other opening 3 of the cylindrical body 1 via a hinge 51 so as to be able to open and close. The reinforcing frame 31 is also provided with a well-known fastening means (not shown) consisting of a detachable insert pin or the like, which allows the bottom cover 5 to be fastened in the closed state. In addition to 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 grid 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 material 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 falling rocks generated at the rockfall source A to the first opening 2 of the cylindrical body 1 without intercepting them. Note that, in addition to the mesh material, the surface material 62 of the guide 6 can be made of, for example, expanded metal, a mesh-like surface material made of steel wires joined together in a vertical and horizontal grid pattern, a plate material without holes, or the like, as appropriate.

[0020] As shown in Figures 2 and 3, the rockfall guidance structure 10 for slopes of this embodiment is constructed on slopes S where there is a risk of rockfall accidents by positioning one opening 2 of the cylindrical body 1 near the rockfall source A on the slope S and positioning the other opening 3 below the slope, fixing the cylindrical body 1 to the slope S, and installing a guide 6 at one opening 2.

[0021] When a rock falls from rockfall source A, the rockfall guiding structure 10 for slopes of this embodiment guides the falling rock with guide 6 and takes it into one opening 2 of cylindrical body 1, where it falls inside cylindrical body 1 and is guided to another opening 3 provided with bottom cover 5 below the slope, where it accumulates inside the cylinder. In this way, facilities B such as roads below the slope are protected.

[0022] 4, the bottom cover 5 of the other opening 3 of the cylindrical body 1 is opened as needed to discharge the fallen rocks R accumulated inside the cylinder as needed, 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.

[0023] As described above, according to the rockfall guiding structure 10 for slopes of this embodiment, the first opening 2 of the cylindrical body 1 is located near the rockfall source A on 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 width direction of the slope with great kinetic energy and jumps down the slope. Therefore, it is not necessary to make the first opening 2 of the cylindrical body 1 or the guide 6 sturdy enough to withstand the impact of a large rockfall, like the supports of a conventional pocket-type rock net construction method or a rockfall protection fence, or to attach impact mitigation equipment, and construction can be done easily and at low cost.

[0024] Furthermore, with the rockfall guiding structure 10 for slopes of this embodiment, falling rocks taken in through one opening 2 of the cylindrical body 1 are allowed to fall within the cylindrical body 1, so that the direction of the falling rocks is controlled while they are reliably guided to a predetermined location on the slope where the other opening 3 of the cylindrical body 1 is located, and they can be accumulated there. Therefore, unlike conventional pocket-type rock net construction methods and rockfall protection fences, there is no need to extend the installation length in the slope width direction to accommodate the spread of falling rocks in the slope width direction, which also makes construction easy and inexpensive. Furthermore, because fallen rocks can be reliably accumulated in a predetermined location, maintenance work such as rock removal can be carried out safely and easily.

[0025] Furthermore, according to the rockfall guidance structure 10 for slopes of this embodiment, the cylindrical body 1 has many holes 11, so that rocks falling inside the cylindrical body 1 can be repeatedly collided with the hole edges of each hole 11, and the kinetic energy of the falling rocks can be gradually absorbed while being guided to the other opening 3 of the cylindrical body 1, and can be safely and securely stopped by the bottom cover 5. Therefore, it is not necessary to make the other opening 3 of the cylindrical body 1 or the bottom cover 5 sturdy enough to receive falling rocks 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] Furthermore, 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 seen 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 carried out safely and easily.

[0027] Furthermore, according to the rockfall guidance structure 10 for slopes of this embodiment, the cylindrical body 1 is made of a mesh body with many meshes, so it is relatively light and can be bent relatively easily in the longitudinal direction. Therefore, it has a high degree of freedom in installation on the slope S, and for example, as shown in Figure 3, it is easy to install the cylindrical body 1 along the stream or valley of the slope S depending on the situation, and it has excellent workability.

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

[0029] Although the rockfall guiding structure 10 for slopes according to this embodiment has been described above, the present invention can also be implemented 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 a 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 a rockfall source A located in the middle of the slope S. Furthermore, it is sufficient that the other opening 3 of the cylindrical body 1 is located below 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 one opening 2 and the other opening 3 of the cylindrical body 1 may be larger than that of the trunk portion, or the opening shape may be different from that of the trunk portion. 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 forms, including improvements, modifications, and variations based on the knowledge of a person skilled in the art, without departing from the spirit of the invention. Furthermore, within the scope of producing the same action or effect, any of the features specifying the invention may be substituted with other technology, and an integrally configured feature of the invention may be composed of multiple components, or an integrally configured feature of the invention consisting of multiple components may be embodied. [Explanation of symbols]

[0033] 10 Rockfall guidance structures on slopes 1. Cylindrical body 11 Hole 2. One opening (of the cylindrical body) 3. Other openings (of the 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 its body; 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; a bottom cover that closes the other opening of the cylindrical body in an openable and closable manner; Equipped with A rockfall guidance structure for slopes, characterized in that falling rocks taken in through one opening of the cylindrical body are dropped within the cylindrical body having the hole, and the kinetic energy of the falling rocks is absorbed while being guided to the other opening of the cylindrical body.

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

3. 3. A rockfall guidance structure for slopes according to claim 1 or 2, wherein the cylindrical body is made of a mesh body having a large number of mesh holes.

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