JPH1060866A - Erosion control dam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dam which has a large energy absorption and which is relatively easy in terms of construction and repair work. SOLUTION: A erosion control dam is provided on both ends of a location which is desired to prevent earth and sand or driftwood in a mountain torrent and a river and so forth where anchor mounts 20 are erected and buried in a concrete structure 11. In this case, a plurality of Jaw anchor bolts are fixed by two rows with a specified spacing in the vertical direction and with the desired spacing in the longitudinal direction. Cables 30A are stretched between the responding Jaw anchor bolts on both sides, which allows a plurality of cables 30A to be erected on the front side with a spacing in the vertical direction and permits a plurality of cables to be erected on the rear side substantially in the horizontal direction in a similar manner. A plurality of spacing holding materials 40A and 40B extending in the vertical direction are mounted on the cable 30A on the front and the cable on the rear side respectively with a desired spacing on both sides and respondingly with the longitudinal direction. The spacing holding materials 40A and 40B responding to the longitudinal direction are connected to each other with a plurality of connecting materials 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a mountain stream where debris flow and driftwood are generated,
It relates to sabo dams installed in rivers.

[0002]

2. Description of the Related Art Conventional sabo dams include a buttress screen dam and a steel slit dam. Each of these sabo dams is constructed by assembling steel materials (H-section steel, angle iron, steel pipe, etc.) vertically and horizontally and standing on a concrete foundation.

[0003] In such a conventional sabo dam, the steel itself absorbs energy such as debris flow through plastic deformation and has no elasticity. A large amount of steel is required because of the necessity of strong assembly. The workability is not good because of its heavy weight. Moreover, when it is locally deformed or damaged, it is difficult to repair it. Since there is almost no elasticity, there are problems such as low absorption energy.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a sabo dam which has a large absorbed energy and is relatively easy to construct and repair.

The sabo dam according to the present invention has the following structure. Anchor stands are erected at the left and right ends of places where mountainous streams, rivers and other soils, driftwood, etc. are to be prevented, and buried in concrete structures. A plurality of anchor members are fixed to these anchor bases at predetermined intervals in the vertical direction and in two rows at intervals in the front-rear direction, and a part of the anchor members protrudes from the concrete structure. Cables are respectively stretched between the anchor members corresponding to the left and right.
As a result, a plurality of cables are installed on the front side at an interval in the vertical direction, and a plurality of cables are similarly installed on the rear side in a substantially horizontal direction. A plurality of spacing members extending in the vertical direction are attached to the front cable and the rear cable, respectively, at intervals in the left-right direction and corresponding to the front and rear. The spacing members corresponding to the front and rear are mutually connected by a plurality of connecting members.

When this sabo dam is installed across a mountain stream or river, the front-back direction means a direction connecting upstream and downstream, and the left-right direction means a direction connecting both banks.

[0007] Left and right anchor tables (concrete structures)
If the distance between them is long, one or more intermediate supports are erected between them, preferably on a concrete foundation. Cables are fixed to the front and rear surfaces of this intermediate support, respectively.

[0008] The concrete structure may be provided with a projection for protecting the anchor member from driftwood or the like.

Further, if necessary, a net is provided on at least one of the plurality of front cables and the plurality of rear cables.

According to the expected energy of debris flow, driftwood, etc., the structure and size of anchor pedestal, concrete structure, intermediate support, thickness and number of cables, dimensions and number of spacing members and connecting members, etc. It is set appropriately.

According to the present invention, a plurality of cables are respectively installed on the front and rear sides of the sabo dam to form a double structure. In addition, a plurality of spacing members are attached to the plurality of cables, and the corresponding spacing members are connected by connecting members. Therefore, the front and rear cables, the spacing member attached thereto, and the connecting member for connecting the spacing member constitute a so-called thick elastic body, so that the absorbed energy becomes very large.

[0012] Compared to the conventional sabo dam assembled with steel materials, it is light in weight and excellent in workability.

Since the cable is attached to the anchor member, assembly and repair are easy.

An anchor member is fixed to an anchor base in advance, and the anchor base is embedded in a concrete structure. The anchor member can be provided at an accurate position, and the cable installation position is also accurate. Construction is easy.

[0015]

1 to 3 show an embodiment of the present invention.

Sabo dams are installed across streams such as mountain streams and rivers. Concrete structures 10 are provided on both banks such as rivers and on riverbeds. Concrete structures10
If this is divided into each part, it consists of a wall 11 installed on both banks and a foundation 12 provided on the riverbed. Wall
11 has a portion 13 projecting in the flow direction, and a recess 14 is formed between these projecting portions 13. The projecting portion 13 is for preventing driftwood, falling rocks, and the like from hitting the later-described jaw anchor bolts 23A and 23B and the turnbuckle 31 to protect them. The protrusion 13 may be provided only on the upstream side, or the protrusion 13 may not be provided. The wall 11 is slightly higher on the shore side than the protruding portion 13 (the raised portion is indicated by reference numeral 15). This is the non-overflow area. The area between the walls 11 on both sides is the overflow section (water passage section).

An anchor base 20 is embedded in the wall 11. The anchor base 20 is assembled from an angle steel material. The anchor base 20 is composed of four columns 21 and a horizontal cross member 22 connecting these columns 21, and the columns 21 and the horizontal members 22.
Are fixed by welding.

The anchor base 20 has a jaw anchor bolt 23
A and 23B are provided in two rows at predetermined intervals in the vertical direction. Holes are formed in the support 21 of the anchor base 20, and jaw anchor bolts 23A and 23B pass through these holes, and a nut 24 is fastened to the rear ends of the bolts 23A and 23B. If necessary, a reinforcing plate is fixed to a portion of the support 21 where a hole is to be formed.

Further, a wire mesh retaining rod 25 is fixed to the support 21 on the upstream side of the anchor base 20.

The distal end portions of the jaw anchor bolts 23A and 23B including the jaw portion and the wire netting bar 25 are exposed from the concrete in the concave portion 14 of the wall portion 11.

In the overflow section, an intermediate column 20 is erected on the base section 12. The intermediate support 20 is an H-beam.

Wire ropes (steel cables) 30A, 30B are attached to two rows of jaw anchor bolts 23A, 23B on the upstream side and the downstream side (referred to as front side and rear side, respectively) protruding from the wall portion 11 on both right and left banks. Are erected in the direction crossing the flow of rivers and the like. That is, both ends of the front wire rope 30A are connected to the front jaw anchor bolt 23A via the turnbuckle 31, and a strong initial tension is applied to the turnbuckle 31. These wire ropes 30A are fixed to the front side surface of the intermediate support 20 by U-bolts 25, respectively. Similarly, both ends of the rear wire rope 30B are connected to the rear jaw anchor bolt 23B via the turnbuckle 31, and a strong initial tension is applied to the turnbuckle 31. The wire ropes 30 are fixed to the rear side surface of the intermediate column 20 by U-bolts 25, respectively. The lowermost wire ropes 30A and 30B are located at a height almost in contact with the upper surface of the base portion 12.

On the front and rear surfaces of the sabo dam, a plurality of spacing members (H-section steels) 40A, 40B extending vertically are attached to the wire ropes 30A, 30B at equal intervals between the intermediate columns 20. That is, the front spacing material
The front surface 40A is fixed to the wire rope 30A using a U-bolt 45 on the front surface, and the rear spacing member 40B is fixed to the wire rope 30B using the U-bolt 45 on the rear surface. These spacing members 40A and 40B are wire ropes.
The upper and lower intervals of 30A and 30B are always kept constant.
The wire ropes 30A and 30B are horizontally spaced,
Since A and 40B extend in the vertical direction and are provided at appropriate intervals, a strong grid-like surface for receiving debris flow, driftwood, and the like is formed. Spacing material 40A,
40B is not fixed to the base portion 12 but floats in the air.

A front spacing member 40A and a rear spacing member
40B corresponds to the front and rear, respectively. The spacing members 40A and 40B corresponding to these front and rear portions are connected by a connecting member (H-shaped steel) 41 and fixed to each other. A plurality of connecting members 41 are provided at intervals above and below.

The front and rear spacing members 40A and 40B are connected to the connecting member 41.
The front and rear wire ropes 30A and 30B are attached to the front and rear wire ropes 30A and 30B, respectively.
B, the front and rear spacing members 40A and 40B and the connecting member 41 constitute a kind of elastic body having a large width in the front and rear direction (the wire rope has elasticity in the front and rear direction), and can absorb a large amount of energy. Becomes

This sabo dam blocks large debris flows and driftwood. Normally, water, sand, small pebbles, etc. are allowed to pass. By changing the distance between the wire ropes and the distance between the spacing materials,
The size of the gravel to be passed can be adjusted.

Since the wire ropes 30A and 30B are used, the weight of the material constituting the sabo dam is relatively light.
Good workability.

Since the wire ropes 30A and 30B can be loosened and detached from the jaw anchor bolts 23A and 23B, respectively, and the spacing members 40A and 40B can also be detached, so that even if some of them are damaged, Repair is easy.

As described above, since the jaw anchor bolts 23A and 23B are mounted on the anchor base 20 in advance, the mounting positions of the jaw anchor bolts 23A and 23B are accurate, and the wire ropes 30A and 30B can be installed accurately.

[0030] If necessary, wire mesh 50
Is attached. The wire netting 50 is attached to the wire rope 30A and the wire net retaining bar 25 by using a coupling coil 51 (or a wire band). A wire mesh may be provided on the rear surface of the sabo dam.

When the width of a river or the like is narrow, the intermediate support 20 need not always be provided.

Conversely, as shown in FIG. 4, the intermediate column 20 may be made stronger. The intermediate support 20 is composed of two front and rear supports 21A and 21B made of H-shaped steel and a plurality of cross members 22 connecting these two supports. The front wire rope 30A is fixed to the front surface of the front column 21A, and the rear wire rope 30B is fixed to the front surface of the rear column 21B of the column 21B by U-bolts 25, respectively. According to such a structure, the distance between the front and rear ropes 30A and 30B becomes wider, and larger energy can be absorbed.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a sabo dam.

FIG. 2 is an enlarged perspective view showing an anchor base.

FIG. 3 is an enlarged perspective view showing a part of a sabo dam.

FIG. 4 is a perspective view showing another example of the intermediate support.

[Explanation of symbols]

 10 Concrete structure 11 Wall 12 Base 13 Projection 14 Depression 20 Intermediate support 30A, 30B Wire rope (cable) 40A, 40B Spacing material 41 Connecting material 50 Wire mesh

Claims (4)

[Claims] Claims: 1. Anchor stands are erected in a concrete structure at the left and right ends of a place where sediment such as a mountain stream, a river and the like, driftwood, etc. are to be prevented, and a plurality of anchor stands are provided. Anchor members are fixed in two rows at predetermined intervals in the vertical direction and at intervals in the front-rear direction,
Cables are installed between the anchor members corresponding to the left and right sides, and a plurality of spacing members extending in the vertical direction are spaced apart in the left and right direction on each of the plurality of front cables and the plurality of rear cables. A sabo dam that is attached to the front and rear, and is connected to each other by a plurality of connecting members. 2. The sabo dam according to claim 1, wherein an intermediate support is erected between the left and right anchor stands, and the cables are fixed to the front and rear surfaces of the intermediate support, respectively. 3. The sabo dam according to claim 1, wherein a protrusion for protecting the anchor member is provided on the concrete structure. 4. The sabo dam according to claim 1, wherein at least one of the plurality of front cables and the plurality of rear cables is meshed.