JPH09184116A - Construction method of snowslide/falling stone guard fence and the fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the amount of surplus soil to be treated as for the construction of a concrete foundation for a snowslide/falling stone guard fence and reduce the amount of excavation itself. SOLUTION: When constructing concrete foundations 16 and 17 for a main post 14 and a support post 15 for a falling stone guard fence 11, a plurality of arc-shaped corrugated sheets 28 are connected in the circumferential direction at the positions where foundation holes 18 and 19 for a slope face 1 are to be bored, thereby assembling a cylinder-shaped form 29. While being excavated, the cylinder-shaped form 29 is lowered gradually and then concrete is placed as the concrete foundations 16 and 17. A weir board 33 is spanned between the exposed areas exposed from each slope face of the concrete foundation of the main post 14 which adjoins in the transverse direction of the slope face 1. The weir board 33 is spanned between the concrete foundations 17 of the support posts 15 as well. Both ends of the weir board 33 are mounted on the outside surface of the cylinder-shaped form 29 on the valley side of the slope face. The foundation holes 18 and 19 are filled up with the discharged soil when excavated in the crest side of the slope face of the weir board 33. The discharged soil is used as a filling, thereby reducing the amount of surplus soil to be treated to a satisfactory extent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an avalanche / fall rock protection fence used for avalanche protection fence or a rock fall protection fence for preventing avalanche, and an avalanche / fall rock protection fence.

[0002]

2. Description of the Related Art Conventional avalanche installed on slopes such as mountains
As shown in FIG. 7, a rockfall protection fence is generally provided with a fence post 2 that is installed in the lateral direction of the slope 1 (direction orthogonal to the paper surface in FIG. 7) and a front surface of the fence post 2 (the slope). The fence pillar 2 is generally composed of a main pillar 4 on the mountain side of the slope and a pillar 5 on the slope valley side of the main pillar 4, Both the main pillar 4 and the pillar 5 are fixed to concrete foundations 6 and 7. Conventionally, when constructing the concrete foundations 6 and 7, the foundation holes 8 and 9 are excavated, and the box-shaped formwork is assembled in the foundation holes 8 and 9 using the plate-like formwork material. Place concrete on the
Form a concrete foundation. In addition, concrete foundations include individual foundations that are provided individually for each main pillar or support, continuous foundations that continuously provide foundations for each main pillar that is aligned in the lateral direction of the slope, main foundations for one fence pillar, and foundations for pillars. There is an integrated foundation, etc. that is provided integrally.

[0003]

The excavated soil when excavating the foundation holes 8 and 9 is partially backfilled around the concrete foundations 8 and 9, but the rest is transported to another land and discarded. Processing is required. This waste soil treatment is complicated and expensive. In addition, since the foundation holes 8 and 9 are usually excavated without earth retaining, the work space for assembling the formwork is required in the formwork construction method of assembling the box-shaped formwork with the flat plate formwork material. It is necessary to excavate a large foundation hole, and a large amount of labor is required for foundation hole excavation work.

The present invention has been made in order to solve the above-mentioned problems, and it requires a minimum work site, a small amount of excavation itself, and particularly an avalanche / fall rock protection fence that requires a small amount of residual soil to be treated. The purpose is to provide a construction method and an avalanche / fall rock protection fence.

[0005]

[Means for Solving the Problems] In the avalanche / fall rock protection fence construction method of the present invention for solving the above problems, each of the concrete foundations of the fence columns provided at intervals in the lateral direction of the slope is exposed from the slope. It is characterized by bridging the weir plate between the exposed parts and embanking the discharged soil generated by excavation of the foundation hole on the mountain side part of the weir plate.

According to a second aspect of the present invention, in the method for constructing an avalanche / fall rock protection fence according to the first aspect, a cylindrical form made by connecting a plurality of arc-shaped steel form members in a circumferential direction is installed at a base position, The cylindrical formwork is lowered while excavating the inside of the cylindrical formwork, and the foundation hole for the concrete foundation is excavated and the formwork is constructed.

According to a third aspect of the present invention, in the method for constructing an avalanche / fall rock protection fence according to the second aspect, an end portion of the weir plate is an arc-shaped steel form material on an outer surface on the slope side of the arc-shaped steel form material. It is characterized in that it is fixed to the connection part of each other.

A fourth aspect of the present invention is characterized in that an arc-shaped corrugated sheet or an arc-shaped runner plate is used as the arc-shaped steel mold material of the second or third aspect.

The avalanche / rockfall protection fence according to claim 5 is formed by using a cylindrical form made of arc-shaped steel form material provided in a foundation hole provided at intervals in the lateral direction of the slope. It is characterized in that it comprises a concrete foundation of a fence and a weir plate spanned between exposed portions of the concrete foundations arranged in the lateral direction of the slope, which are exposed from the slope.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG. 1 to 3, reference numeral 11 denotes an avalanche / fall rock protection fence (hereinafter referred to as a rock fall protection fence) according to the method of the present invention. This rockfall protection fence 11 is provided in front of the fence pillars 12 which are installed at intervals in the lateral direction of the slope 1 (direction orthogonal to the paper surface in FIG. 1: left-right direction in FIG. 2). 2) is a structure in which a plurality of wall members 13 made of, for example, H-section steel are horizontally attached, and the fence column 12 includes a main column 14 made of, for example, H-section steel on the slope side, and the main column 14. The pillar 15 is also made of H-shaped steel and is supported from the slope side (right side in FIG. 1), and the bottom connecting member 20 is made of H-shaped steel and connects the bottom portions of the main pillar 14 and the pillar 15. The main pillars 14, the pillars 15, and the bottom connecting member 20 are all bolted to each other. Further, the joint between the wall member 13 and the main pillar 14 is also a bolt joint. Then, the base plates 21 and 22 are welded and fixed to the lower ends of the main pillars 14 and the pillars 15, and the base plates 21 and 22 are fixed to the concrete foundations 16 and 17 with anchor bolts.
And the column 15 is fixed to the concrete foundations 16 and 17. Further, as shown by a chain double-dashed line, a cushioning member 23 such as a rubber tire may be provided on the front surface of the wall material 13.

Explaining the construction procedure of the concrete foundations 16 and 17, first, as shown in FIGS. 5 and 6, a predetermined foundation position on the slope 1 is excavated to form a flat surface 2
Make a recess 27 to the extent that 7a can be obtained.
A plurality of arcuate corrugated sheets 28 are circumferentially connected to each other on the flat surface 27a to assemble a cylindrical form 29. The corrugated sheets 28 are joined to each other by bolting the overlapping portions of adjacent ones. Then, while excavating the inside of the cylindrical form 29, the cylindrical form 29 is gradually lowered to be sunk to a depth required for the form of the concrete foundation. In this case, since the cylindrical formwork 29 serves as an earth retaining structure, and a work space for assembling the formwork is not required outside the formwork, FIG.
As shown in, the size of the foundation holes 18 and 19 may be slightly larger than the diameter of the cylindrical form 29, and the amount of excavation can be minimized. In the illustrated example, the cylindrical form 29 is formed by one step of the corrugated sheet, but if a deeper foundation hole is required, it is formed by two or more steps.

Then, concrete is poured into the cylindrical form 29. The anchor bolts of the base plates 21 and 22 are previously arranged at predetermined positions and embedded in the concrete foundations 16 and 17. Further, with respect to the concrete foundation 16 side of the main pillar 14, since a pulling force acts at the time of receiving rockfall, the lock anchor 30 is obliquely driven through the through hole opened in the cylindrical form 29 as shown in the drawing, and this state Place concrete in. Then, a small gap around the cylindrical form 29 is backfilled with the soil discharged during excavation. By using the lock anchor 30, the concrete foundation 16 can be downsized.

Next, a weir plate 33 is laid between the exposed portions of the concrete foundations 16 and 17 exposed from the slope, and the soil discharged from the excavation of the foundation hole in the mountain side portion of the weir plate 33 is shown in FIG. Embankment as shown in FIG. As shown, the embankment 34 has a generally triangular cross section. In FIG. 3, the area of the embankment 34 is shown by hatching (in this case, no cross section is meant). In this way, since the discharged soil at the time of excavating the foundation hole is treated as the embankment 34 between the fence columns 12, depending on the conditions such as the size of the concrete foundation and the exposed height of the concrete foundation, the residual soil treatment is completely unnecessary. Will or will be a little. In this case, the embankment 34 between the adjacent main pillars 14 or between the pillars 15 is continuous with the concrete foundations 16 and 17 and has the appearance of a part of the structure of a rockfall protection fence, which is natural.

In the embodiment, expanded metal is used as the barrier plate 33, and mounting angle members 35 welded and fixed to both ends thereof are bolted together with the overlapping portions of the corrugated sheets 28 to form a cylindrical mold. It is attached to the frame 29. Moreover, as shown in FIG. 3, from the viewpoint of strength,
The barrier plate 33 has a curved shape that bulges toward the slope in the center between the adjacent main columns 14 or between the columns 15.

Next, the main pillar 14 and the pillar 1 of the fence pillar 12
5 base plates 21 and 22 for concrete foundation 1
Fix with 6 and 17 anchor bolts. Next, wall material 1
When 3 is attached to the main pillar 14 and the cushioning member 23 is attached, the construction work is completed. In addition, it is recommended that the steel parts of the rockfall protection fence be assembled in the factory as much as possible and the on-site assembly be reduced.

In the embodiment, the expanded metal is used as the barrier plate, but the invention is not limited to this, and a wire mesh, a simple steel plate or other various materials can be used. In short, it is enough to support the embankment. In the embodiment, the base plates 21 and 22 welded and fixed to the lower ends of the main pillars 14 and the pillars 15 are fixed to the concrete foundations 16 and 17, but the main pillars and the pillars may be embedded in the concrete foundation.

In the embodiment, the corrugated sheet is used as the arc-shaped steel form material forming the cylindrical form, but the liner plate is curved in an arc shape having the connecting flanges on the four sides of the corrugated steel plate. Of course, it is also possible to use.

Further, in this embodiment, the steel cylindrical formwork 2 is used.
Although the concrete foundation is constructed by using No. 9, the present invention can be applied to the case where the concrete foundation is constructed by a box-shaped formwork using a simple plate-like formwork material. In this case, it is advisable to embed the mounting brackets that fix the ends of the dam plate in the concrete foundation.

[0019]

According to the present invention, a weir plate is bridged between exposed portions exposed from the slope of a concrete foundation for fences,
Since the soil discharged from the excavation of the foundation hole is filled on the slope side of the weir plate, the residual soil that must be transported to another place does not occur at all or is significantly reduced.
Construction is simplified and construction costs are reduced.

Further, according to claim 2, a cylindrical formwork made of an arcuate steel formwork material such as an arcuate corrugated sheet is assembled at the base hole position and lowered to a predetermined position while excavating, Since it is a formwork of concrete foundation, the size of the foundation hole is minimum, that is, the amount of excavation is minimal.
The work of excavation work is greatly reduced.

According to the third aspect, it is easy to attach the dam plate to the concrete foundation, and it is also easy to give sufficient strength to the load applied to the dam plate.

[Brief description of the drawings]

1 shows an embodiment of a method for constructing an avalanche / rockfall protection fence according to the present invention, and is a cross-sectional view of an avalanche / rockfall protection fence installed on a slope.

FIG. 2 is a right side view showing only the structure in FIG.

FIG. 3 is a plan view showing the main body of the protective fence in FIG.

4 is a cross-sectional view taken along the line AA in FIG. 3 (however, the protective fence main body is shown).

FIG. 5 is a diagram illustrating a procedure for installing a steel cylindrical formwork in the avalanche / rockfall protection fence construction method described above.

FIG. 6 is a plan view of FIG. 5;

[Fig. 7] Fig. 7 is a cross-sectional view of an avalanche / rockfall protection fence installed on a slope for explaining a conventional method for constructing an avalanche / rockfall protection fence.

[Explanation of symbols]

 11 Rockfall Protection Fence (Avalanche / Rockfall Protection Fence) 12 Fence Pillar 13 Wall Material 14 Main Pillar 15 Pillar 16,17 Concrete Foundation 18,19 Foundation Hole 20 Bottom Connecting Material 21,22 Base Plate 27 Recess 27a Flat Surface 28 Corrugated Sheet ( Arc-shaped steel form material) 29 Cylindrical form 33 Weir plate 34 Fill embankment 35 Angle

Claims (5)

[Claims] 1. A weir plate is bridged between exposed portions of the concrete foundations of fences provided at intervals in the lateral direction of the slope and exposed at the respective slopes, and foundation holes are excavated in the mountain side portion of the dam plate. A method for constructing an avalanche / fall rock protection fence that is characterized by embankment of discharged soil generated by 2. A cylindrical form which comprises a plurality of arc-shaped steel form members connected in the circumferential direction is installed at a base position, and the inside of the cylindrical form is excavated while the cylindrical form is being excavated. 2. The method for constructing an avalanche / fall rock protection fence according to claim 1, wherein the foundation hole for the concrete foundation is excavated, and the formwork is performed by lowering. 3. An end portion of the barrier plate is fixed to a connecting portion between the arc-shaped steel form members on the outer surface of the arc-shaped steel form member on the slope side. Avalanche / fall rock protection fence construction method described. 4. The method for constructing an avalanche / fall rock protection fence according to claim 2, wherein an arc corrugated sheet or an arc runner plate is used as the arc steel mold frame material. 5. A concrete foundation of a fence post formed by using a cylindrical formwork made of an arcuate steel formwork material provided in a foundation hole provided at intervals in the lateral direction of the slope, and a slope face. An avalanche / fall rock protection fence, comprising: a weir plate that is bridged between exposed portions of the concrete foundations that are lined up in the lateral direction.