JP2005314907A - Small check dam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small check dam 1 for preventing disasters such as an avalanche of sand and stone, having a simple structure, easy in carrying and construction, and having sufficient strength against impact of the avalanche of sand and stone, by using a lightweight and inexpensive material. <P>SOLUTION: This small check dam 1 for preventing disasters of the avalanche of sand and stone, has an upstream wall 2, a downstream wall 3, and an infilling structure 4 constructed between the upstream wall 2 and the downstream wall 3. The upstream wall 2 has a plurality of upstream side reinforcements 5, and an upstream side wall surface 7 composed of upstream side expanded metal 6 inserted into a plurality of these upstream side reinforcements 5. The downstream wall 3 has a plurality of downstream side reinforcements 8, a downstream side wall surface 11 composed of downstream side expanded metal 9 inserted into a plurality of these downstream side reinforcements 8, and a sucking-out preventive material 10 installed on the downstream side expanded metal 9. The infilling structure 4 is constructed by stacking a net material 12 laid between the upstream wall 2 and the downstream wall 3, and an infilling layer 14 composed of infilling sediment 13 packed on this net material 12 in a multilayer shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is constructed in mountainous fields, rivers, hillside slopes, etc., in order to prevent debris flows, landslides, etc. that are likely to occur especially during rainfall, etc., in mountains, rivers, hillside slopes, etc. Debris flow prevention dam (hereinafter referred to as “Tanimeko”, also referred to as “double wall dam” because it has an upstream wall and a downstream wall).

Conventionally, there has been known a debris flow disaster prevention weir that blocks landslides, landslides, debris flows, and the like that occur on inclined surfaces such as hillside slopes (see Patent Document 1). A dam constructed by filling concrete into a pipe is known (see Patent Document 2). Furthermore, a sabo dam constructed by assembling steel members is known (see Patent Documents 3 and 4).
JP 2001-207431 A JP-A-7-3749 JP 57-29717 A JP 2002-327424 A

  In the conventional dam, when the dam body uses materials such as concrete, a steel frame, and a sheet pile, there are the following problems. In other words, when these materials are used, the transportation of the materials is difficult, and heavy equipment is required for the construction, the work becomes large, the transportation costs and the construction costs increase, and there are many mountainous areas where transportation and workability are poor. It is difficult to construct on site.

  In particular, a concrete frame requires heavy machinery for concrete filling work, and the work itself takes time. When a steel frame or sheet pile is used, the assembly work (fixing work with bolts, etc.) takes time and the workability is poor.

  Furthermore, dams using materials such as the above-mentioned concrete, steel frames, sheet piles, etc. are poor in variations, such as not having a structure in which a vegetation mat, thinning material, etc. can be attached to the wall surface. These dams do not necessarily match the mountainous landscape. Other dams have a structure that uses a free frame, but the structure of the wall surface and the selection of materials are relatively free, but the cost is high. Furthermore, in the case of using a free frame, the strength is not sufficient against external forces such as debris flow impact force.

  In order to solve the above-mentioned problems, the present invention is a valley stopper provided with an upstream wall, a downstream wall, and a filling structure constructed between the upstream wall and the downstream wall, and the upstream wall Is a plurality of upstream rebars that are fixed upright at fixed intervals in a direction crossing the flow of debris flow, and an upstream side that is inserted into the upstream rebar and arranged upstream or downstream of the upstream rebar An upstream side wall surface made of expanded metal or a seine net, and the downstream wall is inserted into the downstream side reinforcing bars, and a plurality of downstream side reinforcing bars fixed upright at regular intervals in a direction crossing the debris flow. And a downstream side wall surface made of a downstream expanded metal or a mesh net disposed on the upstream side or downstream side of the downstream side reinforcing bar, and the filling structure is laid between the upstream wall and the downstream wall. A filling layer comprising a cocoon mesh material and an stuffing material packed on the mesh material. Providing Tanitomeko, characterized in that those that are built stacked layers.

  The upstream side expanded metal or mesh and the downstream side expanded metal or mesh have an upper and lower end portion that is folded in one direction or folded in one direction and then folded in the opposite direction. The cross section is formed in a substantially U shape, and the upper and lower ends are inserted and attached to the upstream and downstream reinforcing bars.

  One or more laying nets are laid in the upstream / downstream direction between the upstream wall and the downstream wall, and at least the upstream end or the downstream end of the netting material is inserted into the upstream rebar or the downstream rebar. It is attached by.

  The wall surface material which consists of a thinning material or a board was attached to the outer side of the said downstream side wall surface.

  As the filling material, it is preferable to use earth, sand, gravel or soil cement.

The valley stop work according to the present invention produces the following effects.
(1) Since the upstream wall and downstream wall of the valley stop work according to the present invention can be attached simply by inserting the expanded metal or the seine net into the upstream rebar and the downstream rebar,
A. Easy to install,
B. There is no need for bolts or other parts for mounting,
C. Costs can be reduced compared to wall surfaces using steel sheet piles.

(2) The main body of the valley stop of the present invention does not use expensive steel frames, sheet piles, heavy concrete panels, etc., and is inexpensive and lightweight, such as reinforcing bars, expanded metal, and braided materials. Because it can be constructed with materials that are easy to transport, and the filling material can be used regardless of the type of earth and sand generated at the construction site,
A. Easy to transport materials,
B. There is no need for heavy machinery for transportation,
C. Material costs and transportation costs can be reduced,
D. Expenses required for the disposal of generated earth and sand (waste materials, etc.) at the site are no longer required
E. It can be carried into mountainous areas where it is relatively difficult to access, and construction is also possible.

(3) The valley stop construction of the present invention, as described above, is constructed of a lightweight material such as a reinforcing bar, an expanded metal, a braided net, etc., but the expanded metal is composed of a plurality of upstream reinforcing bars and downstream reinforcing bars. Or, because the wall surface made of a cocoon net is supported from the downstream side or the upstream side, sufficient strength can be exerted against external forces such as debris flow collisions and earth pressure of filling materials (filled soil sand, etc.). it can.

(4) Since the expanded metal, the suck-out preventing material, the netting material and the like are used, the entire structure becomes light, but the strength can be sufficiently exhibited as described above, and the outflow of the filling material can be prevented.

(5) Since the main body of the valley stop work of the present invention does not use a sheet pile or a concrete panel, the vegetation mat, thinning material, Options such as attaching wall materials made of materials such as boards (eg, decorative panels, tin plates, etc.) are possible, so it can be actively adapted to mountainous landscapes as needed.

  The best mode for carrying out the valley stop work according to the present invention will be described with reference to the drawings based on the embodiments.

  Fig.1 (a) is sectional drawing of the whole structure of the valley stop work concerning this invention, FIG. 2 is a perspective view explaining the whole structure of the valley stop work concerning this invention. 1 (a) and 2, the basic structure of the valley stop 1 according to the present invention includes an upstream wall 2, a downstream wall 3, and a filling structure constructed between the upstream wall and the downstream wall. 4 is provided.

  The upstream wall 2 includes an upstream side wall surface 7 including a plurality of upstream reinforcing bars 5 and a plurality of upstream expanded metals 6 inserted into (inserted into) the plurality of upstream reinforcing bars 5. A downstream side wall 11 composed of a downstream expanded metal 9 inserted into (inserted through) the plurality of downstream reinforcing bars 8, and a suck-out preventing member 10 attached to the downstream expanded metal 9. I have.

  In addition, although the upstream wall 2 and the downstream wall 3 were comprised with the upstream side expanded metal 6 and the downstream side expanded metal 9, you may utilize a seine net instead of an expanded metal. In this embodiment, as described above, a configuration using expanded metal will be described.

  The filling structure 4 is made up of a padding material 12 laid between the upstream wall 2 and the downstream wall 3 and a padding sand 13 which is a filling material packed on the padding material 12. The layer 14 is constructed by stacking multiple layers.

  Hereinafter, the configuration of each part of the valley stop 1 according to the present invention will be described in more detail with reference to FIGS. The upstream wall 2 is an upstream side wall surface composed of a plurality of upstream reinforcing bars 5 having a large diameter (meaning a larger diameter than the downstream reinforcing bars 8; for example, a diameter of 38 mm) and a plurality of upstream expander metals 6. 7.

  The plurality of upstream rebars 5 cross a direction crossing the flow of the debris flow, that is, a stream (mountain slope surface, river slope, etc. when built on a river slope, rivers, etc., hereinafter, a stream will be described as an example). It is arranged upright at regular intervals in the direction. The upstream rebar 5 may be erected directly on the ground of a swamp, but when a concrete foundation 15 (abandoned concrete) is placed on the ground of a swamp, a triangle from the outer periphery is placed on the ground concrete 15 Stand up and support using the support material and diagonal material.

  The length of the upstream rebar 5 may be selected as appropriate in consideration of the topography to be constructed and the natural environment, for example, the gradient of the upstream and downstream surfaces. In the present embodiment, long reinforcing bars (for example, 2 m) and short reinforcing bars (for example, 1 m) are alternately shifted and incorporated, but they may all have the same length.

  The upstream side expanded metal 6 is processed into a U-shaped cross section as shown in FIG. That is, the upstream side expanded metal 6 has upper and lower end portions 16 and 16 that are folded in one direction, and has a U-shaped cross section as a whole. The upstream side expanded metal 6 is attached by inserting (inserting) the folded upper and lower end portions 16 and 16 into the upstream side reinforcing bar 5 so as to be disposed on the upstream side of the upstream side reinforcing bar 5. . Since the upstream side expanded metal 6 is supported from the downstream side by the upstream side reinforcing bars 5, even if the debris flow collides, it is not displaced, deformed, or destroyed.

  In this embodiment, the upstream side expanded metal 6 is provided on the upstream side so as to be inserted into the upstream side reinforcing bar 5. However, it may be provided on the downstream side. It can be fixed using the pressure of a certain paddy earth 13. In this case, as shown in FIG. 1 (b), the upstream side expanded metal 6 has upper and lower end portions 16 ′ and 16 ′ that are folded in one direction and then folded in the opposite direction. It is good also as a structure by which the cross section was formed in the U-shape. Thereby, it does not get caught at the time of work from the outside, and it becomes double, so that the force to press the screen material 12 increases.

  Thus, the upstream wall 2 of the present invention has a simple structure in which the upstream side expanded metal 6 is inserted and attached to the upstream side reinforcing bar 5. Therefore, the construction is simple, and parts such as bolts for mounting are unnecessary, and the cost can be reduced as compared with a conventional structure using a steel frame or a steel sheet pile. Nevertheless, since the wall surface is supported from the downstream side by a plurality of large-diameter rebars, sufficient strength against debris flow can be exhibited.

  The downstream wall 3 has a downstream rebar 8 having a smaller diameter (for example, a diameter of 25 mm) than the plurality of upstream rebars 5, a downstream side wall surface 11 made of a plurality of downstream expanded metals 9, and a sucking prevention member 10. It is composed of

  The plurality of downstream reinforcing bars 8 are erected at a constant interval in the direction crossing the flow of the debris flow, that is, in the direction crossing the ridges, like the upstream reinforcing bars 5. The downstream rebar 8 may be erected on the ground in the same way as the upstream rebar 5, but it can be raised from the outer periphery to the solidified concrete 15 (abandoned concrete) using a triangular support or diagonal material. You may stand upright.

  The downstream expanded metal 9 is similar to the upstream expanded metal 6 and has an upper and lower end portions 16 and 16 that are folded in one direction and has a cross section processed into a substantially U shape as a whole. The upper and lower ends 16 and 16 of the downstream expanded metal 9 are attached so as to be inserted into (through) the downstream reinforcing bar 8 so as to be in contact with the upstream surface of the downstream reinforcing bar 8. It is inserted and attached to the upstream rebar and the downstream rebar.

  In addition, although the downstream side expanded metal 9 is provided in the upstream side so that it may be inserted in the upstream side reinforcing bar 8, you may provide in the downstream side, and if it does in this way, the filling soil sand 13 which is a filling material. Can be fixed using the pressure of In this case, as shown in FIG. 1B, the downstream side expanded metal 9 has upper and lower end portions 16 ′ and 16 ′ that are folded in one direction and then folded in the opposite direction. It is good also as a structure by which the cross section was formed in the U shape. Thereby, it does not get caught at the time of work from the outside, and it becomes double, so that the force to press the screen material 12 increases.

  The suck-out preventing member 10 is attached to the downstream side expanded metal 9 by temporarily fastening it with a wire or the like from the upstream side. When the filling earth sand 13 is packed, the sucking prevention material 10 is pressed by the downstream expanded metal 9 by the filling earth sand 13 and does not fall off.

  Since the downstream wall 3 of the present invention has a simple structure in which the downstream side expanded metal 9 can be attached to the downstream side reinforcing bar 8 just like the upstream wall 2, the construction is simple, Parts such as bolts are unnecessary, and the cost can be reduced as compared with a conventional structure using a steel frame or steel sheet pile. Moreover, since the downstream side wall surface 11 is supported by the plurality of downstream rebars 8 from the downstream side, sufficient strength can be exerted even against the earth pressure of the filled earth sand 13.

  Note that the length of the downstream reinforcing bar 8 may be appropriately selected in consideration of the topography, environment, and the like to be constructed, similarly to the upstream reinforcing bar 5. In the present embodiment, similarly to the upstream rebar 5, long rebars (for example, 2 m) and short rebars (for example, 1 m) are alternately shifted and incorporated, but they may all have the same length.

  The nets that make up the netting material 12 (which is a net for burning firewood, also called “wire mesh”) are placed with a slightly thick number of wires at right angles in the vertical and horizontal directions (the vertical lines are called “vertical lines”). , The number line placed on the side is called "horizontal line"), and it is formed by welding the intersection.

  The lowermost netting materials 12u and 12d are laid directly on the ground of the swamp, or when the root concrete 15 is placed on the ground of the swollen, it is laid on the ground concrete 15. The upstream end of the mesh 12 is fixed so as to pass the upstream rebar 5. Further, the downstream end 12 of the mesh is fixed so as to pass the downstream reinforcing bar 8.

  The seine material 12 is laid between the upstream rebar 5 and the downstream rebar 8 in a necessary length in the upstream / downstream direction. The length of the laying and the mode of laying differ depending on the scale of the valley stop 1 and the installation environment. For example, when the valley stop 1 is thin (when the upstream and downstream dimensions of the valley stop 1 are small), it can be laid from the upstream rebar 5 to the downstream rebar 8 with a single braid 12 in the upstream / downstream direction. It is.

  Alternatively, two mesh members 12 are laid and a mesh member 12 having an upstream end attached to the upstream rebar 5 and a mesh member 12 having a downstream end attached to the downstream rebar 8 as shown in FIG. However, the aspect laid so that it may overlap in the center part of an upstream / downstream direction may be sufficient.

  When the valley stop 1 is thick (when the upstream and downstream dimensions of the valley stop 1 are large), a plurality of mesh members 12 are connected to each other in the upstream / downstream direction and laid from the upstream reinforcing bar 5 to the downstream reinforcing bar 8. In this case, the upstream end of the upstream mesh member 12 is attached to the upstream reinforcing bar 5, and the downstream end of the downstream mesh member 12 is attached to the downstream reinforcing bar 8. In addition, it is good also as an aspect which does not lay the netting material 12 in the center part of an up-down direction.

  It is good also as a structure which attached to the outer side (downstream side) of the downstream side wall surface 11 the wall surface material formed with the thinning | timber thinning material, a board (for example, a decorative panel, a tin plate, etc.). Specifically, in the case of thinned wood, the thinned wood is placed horizontally and stacked so as to abut against the downstream reinforcing bar 8, the clamp is placed on the thinned wood, and this clamp is inserted into the downstream reinforcing bar 8 and attached. Alternatively, a wall made of thinned material is constructed outside the downstream side wall surface 11 by fastening using other fasteners, fastening steel wires, or the like. Thinned wood may be placed vertically instead of horizontally. Thus, if the thinned material is attached to the outside of the downstream side wall surface 11, the landscape is also excellent. In addition, about the attachment structure of the thinned material, it describes in detail in Unexamined-Japanese-Patent No. 2003-342060 etc. which concern on this application.

  In the present embodiment, an example in which the medium-filled sand 13 is used as the medium-filling material has been described. However, as the medium-filled material, gravel, soil cement, or the like can be used in addition to the sand and sand. Since soil cement does not need to separate earth and sand when mixing with cement, it leads to improvement in workability, and the strength is improved as compared with that obtained by rolling a general padded soil. In addition, purchased materials such as earth and sand generated at the construction site, crusher orchid, granulated stone (powder with adjusted particle size) can be used.

(Construction method)
If necessary, rooting concrete 15 is placed on the ground to be constructed. Then, the plurality of upstream rebars 5 and downstream rebars 8 are each supported on a solidified concrete 15 with a triangular support piece or the like at a predetermined interval in the transverse direction. Or you may drive directly on the ground.

  The upstream end of the first-layer upstream mesh member 12u is attached through the upstream rebar 5. Further, the downstream end of the downstream mesh member 12 d is attached through the downstream reinforcing bar 8. In this embodiment, two pieces of seine material, that is, upstream seine material 12u and downstream seine material 12d are used, and are configured to overlap each other at the central portion 17 of the valley stop 1.

  A plurality of upstream expanded metals 6 are inserted into the upstream rebar 5 in the transverse direction, and the first-layer upstream side wall surface 7 is disposed on the upstream side of the upstream rebar 5. Similarly, a plurality of downstream expanded metals 9 are inserted into the downstream reinforcing bar 8 in the transverse direction, and the first-layer downstream side wall surface 11 is disposed upstream of the downstream reinforcing bar 8.

  Facing the upstream side of the downstream side expanded metal 9, the sucking prevention material 10 is attached with a wire. The first layer of paddy earth sand 13 is placed on the sash nets 12u and 12d laid on the ground (this concrete base when the reinforced concrete 15 is cast). And this inside-filled earth and sand 13 is rolled and hardened.

  On the first layer of paddy earth sand 13, a second layer of braided net material 12 is fixed and laid by passing the upper end and lower end of the second layer through the upstream rebar 5 and the downstream rebar 8. A plurality of upstream expanded metals 6 and downstream expanded metals 9 are inserted into the upstream reinforcing bar 5 and the downstream reinforcing bar 8, respectively, so that the upstream side wall surface 7 and the downstream side wall surface 11 of the second layer are inserted. Place. Facing the upstream side of the downstream expanded metal 9, the sucking prevention material 10 is attached with a wire. Then, the padded sand 13 is placed on the second layer of the netting material 12, and is compacted by rolling.

  In this way, the seine material 12, the upstream side wall surface 7, the downstream side wall surface 11, and the suction prevention material 10 of each layer toward the upper layer are arranged and attached in sequence, and the bottom soil is formed as a multi-layer structure including the padded sand 13 Construct Work 1

  As mentioned above, although the best form for carrying out the valley stop work concerning the present invention was explained based on an example, the present invention is not limited to such an example, and is described in a claim. It goes without saying that there are various embodiments within the scope of technical matters.

  As described above, the valley stop work according to the present invention can be easily assembled because it can be attached and assembled by inserting the wall surface and the mesh made of expanded metal into the upstream and downstream reinforcing bars, respectively. Moreover, since the earth and sand generated at the construction site can be used as a filling material, it is most suitable as a valley stop constructed in mountainous areas, rivers, hillside slopes, etc., where the material is carried in and the construction environment is relatively poor. Of course, it can also be applied as a normal reinforced soil retaining wall.

(A) is sectional drawing explaining the whole valley stop construction concerning this invention, (b) is a modification. It is a perspective view explaining the whole valley stop construction concerning the present invention.

Explanation of symbols

1 Valley stop
2 upstream wall
3 Downstream wall
4 Filling structure
5 Reinforcing bar
6 Upstream expanded metal
7 Upstream side wall
8 Downstream rebar
9 Downstream expanded metal
10 Anti-suction material
11 Downstream side wall
12 Netting material
13 Filled earth and sand
14 Filling layer
15 Root concrete
16, 16 'Expanded metal upper and lower ends
12u, 12d Bottom netting material
17 Central part of the valley stop

Claims (5)

A trough stop comprising an upstream wall, a downstream wall, and a filling structure constructed between the upstream wall and the downstream wall,
The upstream wall is arranged on the upstream side or the downstream side of the upstream reinforcing bar that is inserted into the upstream reinforcing bar, and a plurality of upstream reinforcing bars that are fixed upright at regular intervals in a direction crossing the flow of debris flow. Having an upstream side wall surface made of upstream expanded metal or netting,
The downstream wall includes a plurality of downstream rebars that are erected and fixed at regular intervals in a direction crossing the debris flow, and a downstream that is inserted into the downstream rebar and disposed upstream or downstream of the downstream rebar. And a downstream side wall surface made of side expanded metal or a mesh.
The filling structure is constructed by stacking a plurality of filling layers comprising a mesh material laid between the upstream wall and the downstream wall and a filling material packed on the mesh material. Valley stop construction characterized by being.   The upstream side expanded metal or mesh and the downstream side expanded metal or mesh have an upper and lower end portion that is folded in one direction or folded in one direction and then folded in the opposite direction. The valley stop construction according to claim 2, wherein the section is formed in a U-shape, and the upper and lower end portions are attached by being inserted into the upstream side reinforcing bar and the downstream side reinforcing bar.   One or more laying nets are laid in the upstream / downstream direction between the upstream wall and the downstream wall, and at least the upstream end or the downstream end of the netting material is inserted into the upstream rebar or the downstream rebar. The valley stop construction according to claim 1 or 2, characterized by being attached by.   The valley stopper according to claim 1, 2, or 3, wherein a wall material made of a thinned material or a plate is attached to the outside of the downstream side wall surface.   The valley stopper according to claim 1, 2, 3, or 4, wherein the filling material is earth, sand, gravel or soil cement.