JPH08302653A - Weir for timber sent afloat down river - Google Patents

Abstract

PURPOSE: To prevent damage caused by timbers which are sent afloat by collecting effectively to a timber storing basin, which is provided near a weir, through utilization of the flowing water without allowing the timbers to pass the weir. CONSTITUTION: A weir for timbers sent afloat down a river oriented in the river flow direction, wherein combteeth-form constituent pieces 1a of a weir body 1 are dislocated downward aslant one by one at a certain spacing with respect to the river width. Among the constituent pieces 1a, the one located at the downstream termination is embodied as a side wall 1b which is formed along the river width and has a some greater length, and the embankment on the side with this constituent piece 1a is widened outward so that a timber storing basin 5 is formed. A timber storing weir 6 to check timbers and store in the basin 5 is formed from comb-form component parts 6a installed at a certain spacing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driftwood weir for preventing damage to driftwood in rivers and the like.

[0002]

2. Description of the Related Art Conventionally, weirs and erosion control dams have been used for debris flow. Sabo dams should be built especially where gravel movement is strong, and it is necessary to deposit gravel on the upstream side to stabilize the riverbed at a gentle gradient. A secondary dam was set up to prevent scouring on the downstream side. In addition, many erosion control dams, which are not so expensive in a steep mountain stream, were installed in a staircase pattern to calm the entire river.

[0003]

However, the above-mentioned conventional weirs and erosion control dams have the following drawbacks. (B) Conventional dams and erosion control dams are for debris flow, and are not effective structures for driftwood. (B) Driftwood occurs when the water level rises, so the conventional weirs and sabo dams had the drawback that the driftwood would pass over it. With the passage of this driftwood, there were cases where driftwood caught on the piers, etc., causing an increase in water and even greater damage.

The present invention has been made in view of the above points, and an object of the present invention is to efficiently use running water in a storage pond provided in the vicinity of the weir without passing the driftwood by the weir. It is to provide driftwood weirs to the public to collect and prevent damage from driftwood.

[0005]

Means for Solving the Problems The driftwood weir according to the present invention is
Comb-shaped component pieces (1a) of the main body weir (1) oriented in the flow direction of the river are installed at predetermined intervals with respect to the river width, and are sequentially shifted downward, and the downstream side of the component pieces (1a). The component piece (1a) located at the terminal end is formed on the long side wall body (1b) along the river width, and the embankment on the component piece (1a) side located at the downstream end is expanded to the outside and the reservoir (5 ) Is formed, and the storage tree weir (6) for retaining driftwood in the storage reservoir (5) is formed by comb tooth-shaped components (6a) installed at predetermined intervals.

[0006]

In the main weir (1), the driftwood generated by the increase in water is guided by the comb-teeth-shaped component pieces (1a) which are sequentially installed at predetermined intervals with respect to the river width and are slanted downwardly. Driftwood can be taken from the main stream into the storage pond (5) using the running water of the river. The mainstream water flows downstream, evenly between the constituent pieces (1a). Since the reservoir (5) is provided with a storage weir (6) in the downstream portion, only driftwood is retained, and excess water flows into the main stream by the storage weir (6). Therefore, the driftwood in the main stream can be smoothly taken into the storage pond (5), damage to the driftwood can be prevented, and the processing of the driftwood can be collected in one place in the storage pond (5). It is possible and the subsequent processing becomes easy.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. The main weir (1) is provided obliquely to the flow of the river so that the driftwood flows into the storage pond (5), and the running water passes downstream. That is, the component pieces (1a) constituting the main body weir (1) are arranged in a stepping stone shape, and each component piece (1a)
a) are installed so that they are sequentially shifted obliquely downward. The upstream end of each component (1a) is formed in a curved shape in order to reduce the resistance of water or the like. The comb-shaped component pieces (1a) are arranged at predetermined intervals with respect to the river width so as to be sequentially slanted downward. The reason is that the driftwood generated by increasing water hits the component pieces (1a). It is for the purpose of being smoothly introduced into the storage pond (5) described later from the main stream by utilizing the flowing water of the river. An arrow (3) indicates a route direction of the driftwood reservoir (5). And
Water in the main stream of the river is divided into pieces (1
Flows to the downstream side through a).

Among the component pieces (1a), the component piece (1a) located at the downstream end is a long side wall body (1b) along the river width.
To form. At the outer position corresponding to the side wall body (1b), the bank is extended outward to form a storage pond (5). Then, a driftwood is blocked in the storage reservoir (5), and a storage weir (6) is installed so that excess water flows to the downstream side of the main stream. The storage weir (6) is formed by comb-like (stepping stone) constituent members (6a) installed at a predetermined interval.

Due to the use of the driftwood weir having the above structure, the driftwood hits the main body weir (1) by the force of the running water, and along the main weirs (1) arranged obliquely, the driftwood flows into the reservoir (5) together with the running water. The carried driftwood is retained in the storage weir (6) and stays in the storage pond (5), and excess running water is returned to the main stream of the river by the arrow (4).

[0010]

As can be seen from the above description, the driftwood weir of the present invention has the comb-teeth-shaped constituent pieces (1a) of the main weir (1) oriented in the flow direction of the river at a predetermined interval with respect to the river width. The component pieces (1a) located at the downstream end of the component pieces (1a) are sequentially shifted diagonally downward, and the component piece (1a) located at the downstream end is formed on the long side wall body (1b) along the river width and located at the downstream end. Reservoir weir (6) which expands the embankment on the side of the component piece (1a) to form a reservoir tree (5) and blocks driftwood in the reservoir reservoir (5)
Is a comb-shaped component (6a) installed at a predetermined interval
Since it is formed by the method, there is no need to pass the driftwood through the weir as in the past, and as a result, damage such as the driftwood being caught on the piers is eliminated.

Further, the driftwood is a comb-tooth-shaped component piece (1
While being guided by a), the driftwater can be smoothly taken into the storage pond (5) from the main stream by utilizing the running water of the river. The mainstream water will flow downstream between the constituent pieces (1a) and the like. Since the reservoir (5) is provided with a storage weir (6) in the downstream portion, only driftwood is retained, and excess water flows into the main stream by the storage weir (6). Therefore, the driftwood in the mainstream can be smoothly taken into the storage pond (5), damage to the driftwood can be prevented, and the processing of driftwood can be collected in one place in the storage pond (5). It is possible and the subsequent processing becomes easy.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of the present invention.

[Explanation of symbols]

 1 main weir 1a constituent piece 1b side wall 2 arrow of flow direction of main stream of river 3 arrow of path to reservoir of driftwood 4 arrow of running water route with driftwood 5 reservoir 6 reservoir of weir 6a constituent members

Claims (1)

[Claims] 1. Main body weir (1) oriented in the flow direction of a river
The comb-tooth-shaped component pieces (1a) are sequentially installed diagonally downward with respect to the river width, and the component piece (1a) located at the downstream end of the component pieces (1a) has the river width. It is formed on the long side wall body (1b) along the side wall, and the embankment on the side of the component piece (1a) located at the downstream end is expanded outward to form a storage pond (5), and the storage pond (5) is formed on the storage pond (5). The storage tree weir (6) for retaining the driftwood is formed of comb-shaped constituent members (6a) installed at predetermined intervals.