JP6017840B2 - Rolling stone fixing structure and rolling stone fixing method - Google Patents

Description

  The present invention relates to a boulder fixing structure and a boulder fixing method, and more particularly to a boulder fixing structure and a boulder fixing method that suppress the falling of a boulder on a slope.

  Conventionally, in order to prevent slipping of gravel, stones, rocks and floating rocks partially exposed from the slope (generally referred to as “rollstone” in the present invention) buried on the slope (same as the slope), the slope is meshed. As a covered net-type rock fall prevention method that covers the body, a vertical wire with the upper end fixed to the slope and a horizontal wire with the left and right ends fixed to the slope are combined vertically and horizontally, and formed by the vertical wire and the horizontal wire. The whole mesh is covered with a net (wire net), and a vertical wire and a horizontal wire are held at a crossing portion by a connecting metal fitting with a certain holding force (for example, see Patent Document 1). .

JP 2000-265420 A (page 2-3, FIG. 1)

In the invention disclosed in Patent Document 1, when the impact force greater than the holding friction force is applied to the net by the falling rock, the holding portion of the vertical wire and the horizontal wire moves, so that the vertical wire and the horizontal wire are stretched. Although the impact force is absorbed and the falling rock can be dropped to the lower part of the slope without breaking the net, there are the following problems.
(A) In other words, the present invention does not suppress the occurrence of falling rocks themselves, but drops the falling rocks in the gap between the net and the slope. Since the force is applied to the mesh body, an excessively strong mesh body, a horizontal wire, and the like are required, and the cost is increased.
(Ii) In addition, when covering a relatively narrow area of the slope with a net, the vertical and horizontal wires are short, and the amount of extension when impact force is applied to the net is small, so it is not expected to absorb the impact force. .
(U) Also, since the lower end of the vertical wire is not fixed to the slope, falling rocks that fall through the gap between the mesh body and the slope are deposited at the end of the slope, and a part of it falls onto the road, etc. There is.

  The present invention solves such a problem and can be applied without being affected by the size of the slope on which the net body is laid. By catching falling rocks (floating stones) at an early stage, the impact force applied to the mesh body can be kept small, and a part of the boulder does not roll off to the road etc. from the end of the mesh body and The purpose is to provide a fixed stone method.

(1) The boulder fixing structure according to the invention includes a net laid in a net laying range of a slope where a boulder exists;
A lock bolt for a net fixed at a position below the slope from the rolling stone so as to substantially follow the shape of the rolling stone,
A net bearing pressure plate that is installed on the rock bolt for the net and presses the lower part of the roll of the net toward the slope,
A wire lock bolt that surrounds the boulder and the net lock bolt, and is fixed to at least four corners of the net laying range;
A vertical wire and a horizontal wire arranged in a substantially rectangular shape or a substantially cross-girder shape around the net laying range;
A wire bearing plate that is installed on the lock bolt for the wire and presses the intersection of the vertical wire and the horizontal wire toward the slope,
A wire clip connecting the net and the vertical wire;
A wire clip connecting the net and the lateral wire;
Have
(2) Further, a net laid in the net laying range of the slope where the boulders exist, a net lock bolt fixed at a position below the slope from the boulders, and the net lock bolt, A net bearing pressure plate that presses against the slope, the boulders and the net lock bolts, wire lock bolts fixed to at least four corners of the net laying range, and substantially around the net laying range. A vertical wire and a horizontal wire arranged in a rectangular shape or a substantially cross-beam shape, a wire bearing plate that is installed on the lock bolt for the wire and presses the intersection of the vertical wire and the horizontal wire toward the slope, A wire clip that connects the net and the vertical wire, and a wire that connects the net and the horizontal wire Has a lip, the,
A plurality of the lock bolts for the net are arranged along the shape of the lower side of the slope of the boulder, with a substantially arc-like shape spaced apart from each other.

(3) Further , the boulder fixing structure according to the present invention includes a net laid in a net laying range of a slope where the boulders exist, a net lock bolt fixed at a position below the slope from the boulder, and the net. A support plate for a net that is installed in the lock bolt for the net and presses the net toward the slope; a lock bolt for the wire that surrounds the boulder and the lock bolt for the net and is fixed to at least four corners of the net laying range; A vertical wire and a horizontal wire arranged around the net laying range in a substantially rectangular shape or a substantially cross-beam shape, and installed on the lock bolt for the wire, and a crossing portion of the vertical wire and the horizontal wire on the slope A pressure bearing plate for pressing toward the wire, a wire clip connecting the net and the vertical wire, the net and the horizontal It includes a wire clip that connects the ear, and
The vertical wire is folded at a folding position, which is a position of a predetermined length from the end, the overlapping range is gripped by a wire clip, and a locking hole is formed at the folding position, and the horizontal wire is Folded at the folding position, which is a position of a predetermined length from the end, and the overlapping range is gripped by the wire clip, and a locking hole is formed at the folding position,
The wire locking bolt penetrates the locking hole of the vertical wire and the locking hole of the horizontal wire.
(4) Moreover, the boulder fixing structure according to the present invention includes a net laid in a net laying range of a slope where a boulder exists, a net lock bolt fixed at a position below the slope from the boulder, and the net. A support plate for a net that is installed in the lock bolt for the net and presses the net toward the slope; a lock bolt for the wire that surrounds the boulder and the lock bolt for the net and is fixed to at least four corners of the net laying range; A vertical wire and a horizontal wire arranged around the net laying range in a substantially rectangular shape or a substantially cross-beam shape, and installed on the lock bolt for the wire, and a crossing portion of the vertical wire and the horizontal wire on the slope A pressure bearing plate for pressing toward the wire, a wire clip connecting the net and the vertical wire, the net and the horizontal It includes a wire clip that connects the ear, and
The net support plate is a substantially arc-shaped flat plate, a bottom plate in which a through hole through which the net lock bolt passes is formed, and an upper plate formed along a side edge of the bottom plate having a smaller radius of curvature. And
The bottom plate and the upper plate are continuous by a curved surface having a substantially arc-shaped cross section,
A reinforcing plate is provided to be fixed to the bottom plate and the upper plate across the bottom plate and the upper plate.

(5) The boulder fixing method according to the present invention includes a step of fixing a lock bolt for a net at a position below the slope from the boulder so as to substantially follow the shape of the boulder on the slope where the boulder exists,
Fixing the lock bolt for wire at each of the four corners of the net laying range surrounding the boulder and the lock bolt for the net on the slope;
Laying a net in the net laying range;
A step of arranging a vertical wire and a horizontal wire in a substantially rectangular shape or a substantially cross-girder shape around the net laying range;
Installing a net bearing pressure plate on the net lock bolt, and pressing the lower part of the roll of the net toward the slope;
Installing a pressure bearing plate for the wire on the lock bolt for the wire, and pressing an intersection of the vertical wire and the horizontal wire toward the slope;
Connecting the net and the vertical wire by a wire clip, and connecting the net and the horizontal wire by a wire clip, respectively;
Have

(I) In the boulder fixing structure according to the present invention, the net that covers the boulder is pressed against the slope at a position below the slope from the boulder on the slope. In addition to restraining, even if a boulder occurs, it can catch the boulder in the early stage of sliding. Therefore, the impact force applied to the net can be kept small. Moreover, since the lower edge of the slope of the net is pressed against the slope by the horizontal wire, part of the rolling stone does not roll onto the road or the like from the end of the net.
(Ii) Further, since the net is pressed against the slope along the shape of the lower side of the boulder, the occurrence of the boulder can be effectively suppressed, and the boulder can be received effectively.

(Iii) Since the lock bolt for the wire passes through the locking hole of the vertical wire and the locking hole of the horizontal wire, the vertical wire and the horizontal wire cross each other reliably, and the respective end portions cannot move. Is positioned.
(Iv) Further, since the net bearing plate includes a bottom plate and an upper plate that are continuous by a curved surface, and a reinforcing plate that couples both, the load of the rolling stone can be reliably received, and the load concentrated on the net. In this way, it is possible to reliably receive the load of the boulder, and to promote the fallen leaves and sediment accumulation. Therefore, the reliability of the boulder fixing structure is ensured, and it contributes to environmental conservation by returning to the natural beauty by promoting greening.
(V) Furthermore, since the boulder fixing method according to the present invention includes the above-described steps, each step is simple and can be performed quickly, so that the work period can be shortened.

BRIEF DESCRIPTION OF THE DRAWINGS The top view and sectional drawing of a side view which show typically the boulder fixing structure which concerns on Embodiment 1 of this invention. The top view and sectional drawing of a side view which show the support plate for net | networks of the boulder fixed structure shown in FIG. Sectional drawing of the side view which expands and shows the structure of the rock bolt for net | networks of the crush fixed structure shown in FIG. Sectional drawing of the side view which shows the lock washer, lock nut, and cap of the boulder fixed structure shown in FIG. The top view and sectional drawing of a side view which show the support plate for wires of the boulder fixed structure shown in FIG. Sectional drawing of the side view which expands and shows the structure of the rock bolt for wires of the boulder fixed structure shown in FIG. 1, and the support plate for wires. The left-right side view and top view which show the wire clip of the boulder fixed structure shown in FIG. The top view which shows the vertical wire and horizontal wire of the boulder fixed structure shown in FIG. The flowchart explaining the boulder fixing method concerning Embodiment 2 of this invention.

[Embodiment 1]
1 to 8 are diagrams for explaining a rolling stone fixing structure according to Embodiment 1 of the present invention. FIG. 1 (a) is a plan view schematically showing, and FIG. 1 (b) is a sectional view in side view. FIG. 2A is a plan view showing a part of the structural member (net bearing plate), and FIG. 2B is a side sectional view of the structural member (net bearing plate). 3 is a side sectional view showing an enlarged structure of a part (the lock bolt for the net and the support plate for the net), and FIG. 4A is a sectional view in the side view showing a part of the structural member (lock washer). 4 (b) is a side sectional view showing a part of the constituent member (lock nut), FIG. 4 (c) is a side sectional view of the part of the constituent member (cap), and FIG. a) is a plan view showing a part of the structural member (wire support plate), FIG. 5B is a sectional view in side view showing the part of the structural member (wire support plate), 6 is a side sectional view showing an enlarged structure of a part (wire lock bolt and wire support plate), FIG. 7A is a left side view showing a part of the constituent member (wire clip), and FIG. 7 (b) is a plan view showing a partial constituent member (wire clip), FIG. 7 (c) is a right side view showing the partial constituent member (wire clip), and FIG. 8 is a partial constituent member (vertical wire). It is a top view which expands and shows a horizontal wire.
Each figure is drawn schematically, and in particular, in order to facilitate understanding, even components that are in partial contact with each other are drawn with a gap therebetween, so the mutual sizes and the like are illustrated. The form is not limited.

(Rolling stone fixing structure)
1 (a) and 1 (b), a boulder fixing structure 100 is for a net 1 laid on a slope 900 where a boulder 800 exists and a net fixed to a position below the slope 800 of the slope 900 from the boulder 800. Locking bolts 2a, 2b and 2c, net supporting bolts 3a, 3b and 3c which are installed on the net locking bolts 2a, 2b and 2c and press the net 1 toward the inclined surface 900, and the boulder 800 and the net locking bolt 2a 2b and 2c are surrounded and fixed to the four corners (indicated as “I, B, C, and D” in FIG. 1) of a substantially rectangular range (hereinafter referred to as “net laying range”) 901 of the slope 900. It has the lock bolts 4a, 4b, 4c, 4d for wires, and the vertical wires 6a, 6b and the horizontal wires 7a, 7b arranged in a substantially rectangular shape or a substantially cross-beam shape.

The wire lock bolt 4a is provided with a wire support plate 5a that presses the intersection of the vertical wire 6a and the horizontal wire 7a toward the inclined surface 900. The wire lock bolt 4b includes the vertical wire 6b and the horizontal wire. A wire pressure plate 5b that presses the intersection with the wire 7a toward the slope 900 is installed, and the wire lock bolt 4c is for the wire that presses the intersection between the vertical wire 6b and the horizontal wire 7b toward the slope 900. A support plate 5c is installed, and a wire support plate 5d that presses the intersection of the vertical wire 6a and the horizontal wire 7b toward the inclined surface 900 is installed on the wire lock bolt 4d.
Further, the net 1 and the vertical wires 6a and 6b are coupled to each other by the coupling coil 8 and the net 1 and the lateral wires 7a and 7b are coupled to each other.

In addition, in the following description, about the common content, description of the code | symbol suffix "a, b, c, d" is abbreviate | omitted.
Further, for convenience of explanation, the case where there is one boulder 800 in the net laying range 901 is shown, but the present invention is not limited to this, and there are a plurality of boulders 800 in the net laying range 901. At this time, the lock bolt 2 for nets is installed under the slope of each boulder 800.
Moreover, the lock bolt 4 for wires and the support plate 5 for wires are not limited to what pushes the cross | intersection part of the vertical wire 6 and the horizontal wire 7 to the inclined surface 900, The middle of the vertical wire 6 or the horizontal wire 7 is inclined. You may press against 900. At this time, the number of wire lock bolts 4 is five or more.
Furthermore, the vertical wire 6 and the horizontal wire 7 are not limited to a pair, respectively, and may include three or more vertical wires 6 and horizontal wires 7 arranged in a ladder shape or a lattice shape.

(Supporting plate for net)
In FIG. 2, the net support plate 3 is a box having an opening on one side, and includes a bottom plate 31 that is a substantially arc-shaped flat plate, and a side edge (a concave side of the bottom plate 31 having a smaller curvature radius). The upper plate 32 formed along the edge), the lower plate 33 formed along the side edge having the larger curvature radius of the bottom plate 31 (the convex side edge), the bottom plate 31, the upper plate 32, and the lower plate End plates 34 and 35 for joining the end edges of the side plate 33 are provided.
The bottom plate 31 and the upper plate 32 are continuous via a curved surface 36 having an arcuate cross section, and the bottom plate 31 and the lower plate 33 are continued via a curved surface 39 having an arcuate cross section. A bolt hole 37 through which the net lock bolt 2 passes is formed in the approximate center of the bottom plate 31, and drain holes 38 a and 38 b for draining are formed in the corners of the bottom plate 31. In addition, when joining the baseplate 31 and the lower side board 33 which each consist of a separate board | plate material, formation of the curved surface 39 may be abbreviate | omitted.

At this time, the reason why the net support plate 3 is formed in the box is to reliably receive the load of the boulder 800 through the net 1 when the boulder 800 is about to rise or start to slide down. That is, the end plates 34 and 35 function as reinforcing plates that prevent the upper plate 32 from falling down on the lower side of the slope.
In addition, the bottom plate 31 and the upper plate 32 are continuous via the curved surface 36 having an arc cross section. When the net support plate 3 receives the load of the rolling stone 800, the net 1 has the bottom plate 31 and the upper plate 32. This is because the area of the boundary is widened so that no concentrated load is applied to the net 1.
In addition, since the net support plate 3 suppresses the dissipation of the fallen leaves and earth and sand that have been blown (dropped) onto the net 1 and the net support plate 3 by the upper plate 32 and the lower plate 33, Deposition is promoted. Therefore, since the humus is piled up on the boulder fixing structure 100 at a relatively early time after the boulder fixing structure 100 is installed, the boulder fixing structure 100 is covered with vegetation, and the natural beauty is restored by promoting greening. Contribute to environmental conservation.

In the present invention, the net 1 is slanted at a position close to the boulder 800 on the lower side of the boulder 800 for the purpose of pressing the boulder 800 against the slant 900 before the boulder 800 is lifted or in the initial stage of the fall of the boulder 800. Therefore, the net lock bolt 2 and the net support plate 3 are not limited to the above-described configuration.
For example, if the boulder 800 is small and light, the net lock bolt 2 may be less than three. On the other hand, if the boulder 800 is large and heavy, or if a plurality of boulders 800 are gathered in one place, the net Increase the number of lock bolts 2 to 4 or more.
Further, when the number of the vertical wires 6 is three or more and the vertical wires 6 pass over the rolling stone 800, the net support plate 3 may press the vertical wires 6 together. Further, when it is not necessary to reinforce the net bearing plate 3, the end plates 34 and 35 may be removed, and when it is not necessary to promote the accumulation of fallen leaves, the upper plate 32 and the lower plate 33 may be removed. It may be removed. Furthermore, the bottom plate 31 may be rectangular or circular instead of a substantially arc-shaped flat plate.
Further, the net 1 may come into contact with the inclined surface 900 (if it is held) or float up from the inclined surface 900 at a position in contact with the net support plate 3.

(Lock bolt for net)
In FIG. 3, the net lock bolt 2 is a rod or tube having a male screw (or spiral protrusion) 21 formed on the outer surface, and is disposed in a lock bolt installation hole 910 formed in the inclined surface 900. It is fixed by a grout material (cement milk) 920 so that it cannot be pulled out. In addition, although the excavation bit 29 is fixed to the lower end of the lock bolt 2 for nets, and it is a self-drilling type to dig while forming the lock bolt installation hole 910, the present invention is not limited to the self-drilled type, The net lock bolt 2 may be inserted into the formed lock bolt installation hole 910.

The net lock bolt 2 fixed to the inclined surface 900 passes through the net of the net 1 and the bolt hole 37 of the net support plate 3. A square washer 22, a cap washer 23, and an inner spherical surface of the cap washer 23 are formed on the bottom plate 31 of the net bearing plate 3 and have a through hole through which the net lock bolt 2 passes. A lock nut 24 having a slidable outer spherical surface 24b is disposed at 23d, and the lock nut 24 is screwed into the lock bolt 2 for the net. That is, since the inner spherical surface 23d and the outer spherical surface 24b slide, even if the net lock bolt 2 and the bottom plate 31 of the net support plate 3 are not vertical, the lock nut 24 is provided with the square washer 22. And the cap washer 23 can be pressed against the slope 900 side.
Further, a cap 25 that covers the upper end of the net lock bolt 2 and the lock nut 27 is installed, and a rust preventive material 26 is enclosed in the cap 25.

4A, the cap washer 23 has a substantially cylindrical shape having an inner surface 23a through which the lock bolt 2 for a net can pass, and a bottom surface 23b that is a circular plane, and a male screw 23c formed on the outer surface. And an inner spherical surface 23d formed on the inner surface.
In FIG. 4B, the lock nut 24 is a cylindrical body having a female screw 24a that is screwed into the male screw 21 of the net lock bolt 2. On the outer surface, the lock nut 24 has an inner spherical surface 23d of the cap washer 23. And a slidable outer spherical surface 24b, and a hexagonal section gripping portion 24c gripped by a rotary tool (such as a spanner).
In FIG. 4C, the cap 25 is a cylindrical body having a female screw 25a that is screwed into the male screw 23c of the cap washer 23, and is gripped by a flat bottom surface 25b and a rotary tool (such as a spanner). Are formed in the grip portion 25c having a substantially polygonal cross section (a flat surface is formed at a diagonal position on the outer surface of the cylinder), the dome portion 25d in which the cylindrical portion and the ceiling portion are coupled, and the ceiling portion of the dome portion 25d. The injection hole 25e (see FIG. 3) and a plug 25f having a male screw screwed into the female screw 24a formed in the injection hole 25e are provided. An annular recess is formed on the bottom surface 25b, and a seal ring 25g is disposed in the recess.

(Supporting plate for wire)
In FIG. 5, the wire support plate 5 is a rectangular flat plate formed into a L-shaped cross section (bending), and includes a bottom plate 51 in which a bolt hole 57 through which the wire lock bolt 4 passes is formed. The bottom plate 51 includes an upper plate 52 that is continuous via a curved surface 56 having a circular arc in cross section.
That is, the wire support plate 5 is the same as that obtained by removing the lower plate 33, the end plates 34 and 35, and the drain holes 38a and 38b from the net support plate 3. The net support plate 3 is reinforced by the end plates 34 and 35 in order to reliably receive the load of the boulder 800 through the net 1, but the load of the boulder 800 directly acts on the wire support plate 5. Therefore, installation of a member for reinforcement is omitted, and the manufacturing cost is kept low. Note that a curved surface having a circular arc in section may be formed on the side edge 59 of the bottom plate 51 in accordance with the curved surface 39 of the net bearing plate 3.
The upper plate 52 is not disposed only on the upper surface of the inclined surface 900 with respect to the bottom plate 51, but is disposed on the lower surface of the inclined surface than the bottom plate 51, or at a predetermined angle with respect to the maximum inclined line of the inclined surface 900. It is arranged diagonally with a. Of course, it is also possible to install the net support plate 3 in place of the wire support plate 5.

In addition, the formation point of the support plate 5 for wires is not limited, For example, you may cut and form the steel material of a cross-sectional L-shape, and it does not need to provide the curved surface 56 at this time. The bottom plate 51 is not limited to a rectangular shape, and may be a circular flat plate, and the upper plate 52 may be installed at a string position (a position other than the outer periphery).
And since the pressure plate 5 for wires is equipped with the upper side plate 52, since the accumulation of deciduous leaves is promoted like the pressure plate 3 for nets, natural beauty is restored by the promotion of greening. Contribute. If there is no request for environmental protection, the upper plate 52 may be removed.

(Lock bolt for wire)
In FIG. 6, since the wire lock bolt 4 has the same structure as the net lock bolt 2, the same reference numerals as those of the net lock bolt 2 are used, and the description thereof is omitted.
The lock bolt 2 for the net presses the net 1 by installing the support plate 3 for the net, whereas the lock bolt 4 for the wire has the vertical wire by installing the support plate 5 for the wire. 6 and the horizontal wire 7 are pressed against each other (however, when a position other than the end of the vertical wire 6 or the horizontal wire 7 is pressed), the crossing portion between the two may not be pressed).
Note that the vertical wire 6 or the horizontal wire 7 may come into contact with the inclined surface 900 (when held) or float up from the inclined surface 900 at a position where the vertical wire 6 or horizontal wire 7 contacts the pressure bearing plate 5 for wire.

(Wire clip)
7 (a), (b) and (c), the wire clip 9 is formed with male screws 91a and 91b at both ends, respectively, a U-shaped member 90 having a pocket 92, a male screw 91a, Nuts 93a and 93b screwed into 91b, a pressing member 94 in which a through hole (not shown) through which male screws 91a and 91b can freely pass, and protrusions 95a, 95b, 95c and 95d provided in the pressing member 94 And a holding groove 96a formed by the protrusion 95a and the protrusion 95b, and a holding groove 96b formed by the protrusion 95c and the protrusion 95d.
Hereinafter, for the common contents, description of the subscripts “a, b, c, d” is omitted.

Therefore, by arranging a pair of wire portions in the pocket 92 and the grip groove 96 and tightening the nut 93 to press the pressing member 94 against the wire portion, the pair of wire portions are gripped in a state in which they are difficult to move relative to each other. Is done.
A part of the folding range 62 and a part of the overlapping range 63 of the vertical wire 6 are pushed into the pocket of the U-shaped member 90 and are gripped by the pocket and the holding member 94 by rotating the nut 93. Is done. The same applies to the horizontal wire 7.

(Vertical wire / Horizontal wire)
In FIG. 8, a vertical wire 6 and a horizontal wire 7 each have a predetermined strength, and are formed by twisting a plurality of strands (for example, an outer diameter of 12 mm).
The vertical wire 6 is folded at a position (hereinafter referred to as “folding position”) 62 having a predetermined length from the end portion 61, and a folding range 63 that is a range between the end portion 61 and the folding position 62 is a folding position. It is gripped by the wire clip 9 that is overlapped with the overlapping range 64 on the main body side (same as the side opposite to the end portion 61) rather than 62 and that is disposed at a predetermined interval. At this time, a locking hole 65 is formed at the turn-back position 62.
Similarly, a locking hole 75 is formed in the horizontal wire 7, and the folding range 73 and the overlapping range 74 are held by the wire clip 9.

The wire lock bolt 4 passes through the locking hole 65 of the vertical wire 6 and the locking hole 75 of the horizontal wire 7. That is, the vertical wire 6 and the horizontal wire 7 intersect at the locking hole 65 and the locking hole 75, and the crossing portion is positioned by the wire lock bolt 4, reliably contacts, and moves along the slope 900. Positioned impossible. Further, the intersection is pushed in the direction of the inclined surface 900 by the wire support plate 5 (see FIG. 6).
In addition, the formation point of the locking hole 65 is not limited, the folding hole 65 is formed by pressing the folding position 62 of the vertical wire 6 against the wire lock bolt 4 and bending it so that it is wound. Thereafter, the folding range 63 and the overlapping range 64 may be gripped by the wire clip 9, or the wire clip 9 is previously installed and the locking hole 65 is formed, and the locking hole 65 is formed. May be put on the lock bolt 4 for wire. The same applies to the horizontal wire 7.

(Net)
The outer diameter / strength (chemical composition, etc.) and mesh size (opening) of the steel wire forming the net 1 depend on the weight / quantity of the boulder 800, the slope of the slope 900, the area where the net 1 is laid, etc. (For example, a rhombus wire mesh in which a 50 mm square opening is formed by a steel wire having an outer diameter of 4 mm).
The net 1 and the vertical wire 6 are coupled by a coupling coil 8 (see FIG. 8). The coupling coil 8 is formed of, for example, a steel wire having an outer diameter of 4 mm, and has an outer diameter of 70 mm and a length of 300 mm. Such dimensions are appropriately selected depending on the shape of the net 1 and the vertical wire 6. It is. Further, the coupling coils 8 may be installed at intervals or may be installed so as to overlap each other. The present invention does not limit the coupling means between the net 1 and the vertical wire 6 to the coupling coil 8. The same applies to the connection between the net 1 and the horizontal wire 7.

(Function and effect)
Since the boulder fixing structure 100 has the above-described configuration, the net bearing plate 3 is installed on the lower side of the slope of the boulder 800 and close to the boulder 800, so that the boulder 800 is prevented from being lifted and the boulder 800 slides down. Even when starting, the sliding can be prevented at an early stage of sliding. Therefore, since the impact force applied to the net 1 can be suppressed and damage due to sliding or rubbing of the rolling stone 800 can be suppressed, it is not necessary to make the net 1 excessively high in strength, and the material cost can be suppressed. At the same time, the reliability of the structure increases.
In addition, the lower end portion of the net 1 is coupled to the horizontal wire 7b pressed against the inclined surface 900 by the wire support plate 5 (the locking holes 75 at both ends are locked to the wire lock bolt 4). 8, even if the boulder 800 slides down to the lower end of the net 1 (near the horizontal wire 7 b), it will dive between the net 1 and the slope 900 and become a road or the like. It doesn't roll out.
Further, since the upper plate 32 and the lower plate 33 are provided on the net bearing plate 3, and the upper plate 52 is provided on the wire bearing plate 5, respectively, the loss of fallen leaves and earth and sand can be suppressed. The deposition of is promoted. Therefore, since the humus is piled up on the boulder fixing structure 100 at a relatively early time after the boulder fixing structure 100 is installed, the boulder fixing structure 100 is covered with vegetation, and the natural beauty is restored by promoting greening. Contribute to environmental conservation.

[Embodiment 2]
FIG. 9 is a flowchart for explaining a boulder fixing method according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and a part of the description is omitted.
In FIG. 9, a boulder fixing method 200 is a method for constructing the boulder fixing structure 100 (see FIG. 1) described in the first embodiment. First, on the slope 900 where the boulder 800 exists, the shape of the boulder 800 is obtained. The net locking bolts 2a, 2b, and 2c are fixed to a position close to the rolling stone below the rolling stone 800 so as to substantially follow (S1).
Further, the wire lock bolts 4a, 4b, 4c, and 4d are fixed to the four corners (indicated by “I, B, C, and D” in FIG. 1) of the net laying range 901 surrounding the boulder 800 (S2).
A net 1 having an area capable of covering the net laying range 901 is prepared, and the net 1 is mounted on the slope 900 with the meshes near the upper edge thereof penetrating the lock bolts 4a and 4b for wires on the upper side of the slope. (S3).
Then, the vertical wire 6a and the horizontal wire 7a are locked to the wire lock bolt 4a, and the vertical wire 6b and the horizontal wire 7a are locked to the wire lock bolt 4b, respectively (S4).
Therefore, the wire support plates 5a and 5b are installed on the wire lock bolts 4a and 4b, and the lateral wire 7a on the upper side of the slope is pressed against the slope 900 (S5).
Further, the net 1 in the suspended state is pulled down to the lower side of the rolling stone 800 so that the net lock bolt 2 is penetrated, and the net support pressure plate 3 is installed on the net lock bolt 2. The lower part of the 1 boulder 800 is pressed toward the slope 900 (S6).

Further, the net 1 is pulled down so that the mesh lock bolts 4c and 4d on the lower side of the slope are penetrated (S7).
Therefore, the vertical wire 6b and the horizontal wire 7b are locked to the wire lock bolt 4c, and the vertical wire 6a and the horizontal wire 7b are locked to the wire lock bolt 4d, respectively (S8).
Then, the wire support plates 5c and 5d are installed on the wire lock bolts 4c and 4d, and the vertical wires 6a and 6b and the horizontal wire 7b are pressed against the inclined surface 900 (S9).
Further, the net 1 and the vertical wire 6 and the net 1 and the horizontal wire 7 are respectively coupled by the coupling coil 8 (S10).

The above shows a basic flow, and the order of each process (step) is appropriately changed (the front and rear are switched) or repeated. For example, the coupling between the net 1 and the vertical wire 6 and the coupling between the net 1 and the horizontal wire 7 by the coupling coil 8 may be performed in a plurality of times during the respective steps.
The installation of the wire support plates 5a and 5b on the upper side of the slope and the installation of the wire support plates 5c and 5d on the lower side of the slope are not performed simultaneously after all the wire support plates 5 at the four corners are installed. This is because if the net support plate 3 is installed, the net 1 may be damaged by a tensile force.

  Further, when the wire lock bolt 4 is fixed at a position other than the four corners, such as when the slope 900 is undulated, the net extends from the upper side of the slope to the midway of the slope where the wire lock bolt 4 is fixed. 1 is pulled down, the wire bearing plate 5 is installed at the position, the net 1 and the vertical wire 6 are pressed against the slope, and then the net 1 is moved to a position where the wire lock bolt 4 is fixed further below the slope. Is pulled down, the wire bearing plate 5 is installed at the position, and the operation of pressing the net 1 and the vertical wire 6 against the slope is repeated.

  Since the present invention has the above-described configuration, it can suppress the occurrence of rolling stones, and can effectively prevent sliding down in the early stage of sliding, so that it can be widely installed on slopes under various conditions and a rolling stone preventing construction method. Can be widely used as.

DESCRIPTION OF SYMBOLS 1 Net 2 Net lock bolt 3 Net bearing plate 4 Wire lock bolt 5 Wire bearing plate 6 Vertical wire 7 Horizontal wire 8 Coupling coil 9 Wire clip 21 Male screw 22 Square washer 23 Cap washer 23a Inner surface 23b Bottom surface 23c Male screw 23d inner spherical surface 24 lock nut 24a female screw 24b outer spherical surface 24c gripping portion 25 cap 25b bottom surface 25c gripping portion 25d dome portion 25e injection hole 25f plug 25g seal ring 26 rust prevention material 29 excavation bit 31 bottom plate 32 upper plate 33 lower plate 34 end Plate 35 End plate 36 Curved surface 37 Bolt hole 38 Water drain hole 39 Curved surface 51 Bottom plate 52 Upper plate 56 Curved surface 57 Bolt hole 59 Side edge 61 End portion 62 Folding position 63 Folding range 64 Overlap range 65 Locking hole 73 Folding range 4 Overlapping Range 75 Locking Hole 90 U-Shaped Member 91 Male Thread 92 Pocket Part 93 Nut 94 Pressing Member 95 Protrusion 96 Holding Groove 100 Rolling Stone Fixing Structure 200 Rolling Stone Fixing Method 800 Rolling Stone 900 Slope 901 Net Laying Range 910 Rock Bolt Installation Hole 920 Grout material (cemented milk)

Claims (5)

A net laid in the net laying range of the slope where the boulders exist,
A lock bolt for a net fixed at a position below the slope from the rolling stone so as to substantially follow the shape of the rolling stone,
A net bearing pressure plate that is installed on the rock bolt for the net and presses the lower part of the roll of the net toward the slope,
A wire lock bolt that surrounds the boulder and the net lock bolt, and is fixed to at least four corners of the net laying range;
A vertical wire and a horizontal wire arranged in a substantially rectangular shape or a substantially cross-girder shape around the net laying range;
A wire bearing plate that is installed on the lock bolt for the wire and presses the intersection of the vertical wire and the horizontal wire toward the slope,
A wire clip connecting the net and the vertical wire;
A wire clip connecting the net and the lateral wire;
Rolling stone fixing structure. A net laid in the net laying range of the slope where the boulders exist, a net lock bolt fixed at a position below the slope from the boulders, and a net lock bolt, the net facing the slope. A pressure bearing plate for pressing the net, the rock and the lock bolt for the wire surrounding the rock and the lock bolt for the net, and a substantially rectangular or substantially girder around the net laying range. A vertical wire and a horizontal wire arranged in a shape, a wire support plate that is installed on the lock bolt for the wire and presses an intersection of the vertical wire and the horizontal wire toward the slope, the net, and the vertical wire A wire clip for connecting a wire, a wire clip for connecting the net and the lateral wire, Has,
A plurality of the rock bolts for nets are arranged along the shape of the lower side of the slope of the boulder, with a substantially arc-like shape spaced apart from each other. A net laid in the net laying range of the slope where the boulders exist, a net lock bolt fixed at a position below the slope from the boulders, and a net lock bolt, the net facing the slope. A pressure bearing plate for pressing the net, the rock and the lock bolt for the wire surrounding the rock and the lock bolt for the net, and a substantially rectangular or substantially girder around the net laying range. A vertical wire and a horizontal wire arranged in a shape, a wire support plate that is installed on the lock bolt for the wire and presses an intersection of the vertical wire and the horizontal wire toward the slope, the net, and the vertical wire A wire clip for connecting a wire, a wire clip for connecting the net and the lateral wire, Has,
The vertical wire is folded at a folding position, which is a position of a predetermined length from the end, the overlapping range is gripped by a wire clip, and a locking hole is formed at the folding position, and the horizontal wire is Folded at the folding position, which is a position of a predetermined length from the end, and the overlapping range is gripped by the wire clip, and a locking hole is formed at the folding position,
The locking bolt wire, rolling stones fixed structure you characterized by penetrating the engagement hole of the locking holes the transverse wires of the longitudinal wire. A net laid in the net laying range of the slope where the boulders exist, a net lock bolt fixed at a position below the slope from the boulders, and a net lock bolt, the net facing the slope. A pressure bearing plate for pressing the net, the rock and the lock bolt for the wire surrounding the rock and the lock bolt for the net, and a substantially rectangular or substantially girder around the net laying range. A vertical wire and a horizontal wire arranged in a shape, a wire support plate that is installed on the lock bolt for the wire and presses an intersection of the vertical wire and the horizontal wire toward the slope, the net, and the vertical wire A wire clip for connecting a wire, a wire clip for connecting the net and the lateral wire, Has,
The net support plate is a substantially arc-shaped flat plate, a bottom plate in which a through hole through which the net lock bolt passes is formed, and an upper plate formed along a side edge of the bottom plate having a smaller radius of curvature. And
The bottom plate and the upper plate are continuous by a curved surface having a substantially arc-shaped cross section,
Rolling stone fixing structure you characterized by comprising a reinforcing plate fixed the bottom plate and straddling said on side plates and the bottom plate and the upper plate. In the slope where the boulders exist, fixing the lock bolt for the net at a position below the slope from the boulders so as to substantially follow the shape of the boulders;
Fixing the lock bolt for wire at each of the four corners of the net laying range surrounding the boulder and the lock bolt for the net on the slope;
Laying a net in the net laying range;
A step of arranging a vertical wire and a horizontal wire in a substantially rectangular shape or a substantially cross-girder shape around the net laying range;
Installing a net bearing pressure plate on the net lock bolt, and pressing the lower part of the roll of the net toward the slope;
Installing a pressure bearing plate for the wire on the lock bolt for the wire, and pressing an intersection of the vertical wire and the horizontal wire toward the slope;
Connecting the net and the vertical wire by a wire clip, and connecting the net and the horizontal wire by a wire clip, respectively;
A boulder fixing method.

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