JP2999170B2 - Dam sediment treatment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating sediment of a dam.

[0002]

After the dam has been constructed, sediment accumulates over the years. Therefore, the sediment must be excavated and removed to maintain the function of the dam. However, there is no place to dispose of the earth and sand generated by the excavation, and the processing cost is high.

[0003]

According to the present invention, as a means for solving the above-mentioned conventional problems, a river (1) downstream of a dam (2) is provided.
Weirs (3 ) are set up in the wide section (1A) to divide the sediment dump (4),
該土sand dumps (4) to have a configuration allowed to deposit drilled a dam (2) sedimentation, high and flood than normal water level L ₁ of the river (1) the height of the weir (3) set to be lower than the water level L ₂
And, flood upon該土sand dumps (4) to the dam sediment treatment method and dams to flow down to the sand S are downstream deposition (2) downstream
River (1) A step (3A) is set up in the wide area (1A)
A) and dig a dam (2) sediment in the sedimentation area (4A).
A Te sedimentary allowed to configure, sedimentation field high-stage portion (4A)
The height of the sedimentation area (4A) as the normal water level L _{1 of the} river.
Set lower than high and flooding when the water level L ₂ than floods
Sometimes the sediment deposited in the sedimentation site (4A) flows down
There is provided a dam sediment treatment method of.

[0004]

FIG. 1 and FIG. 2 show an embodiment of the present invention. In FIG. 1, (2) is a dam provided in the river (1), and a wide section (1A) of the river (1) near the dam (2) is selected downstream of the dam (2). In (1A), a weir (3) consisting of concrete, snake basket, futon basket, cobblestone, etc. will be provided to divide the sediment dump (4).

[0005] The sediment dump (4) is located in the wide area (1A) of the river (1).
And the height of the weir (3) is set at the normal water level L _{1 of the} river (1) as shown in FIG.
Higher than, also set lower than the water level L ₂ of the flood (at small flood).

[0006] In the above configuration, the earth and sand deposited on the dam (2) is excavated and removed, and the earth and sand S generated by the excavation is accumulated on the earth and sand accumulation site (4).

In normal times (water level L ₁ ), the water of the river (1) is jumped by the weir (3) as shown by the thick arrow in FIG. At the time of a small flood (water level L ₂ ) or more, the water in the river (1) crosses the weir (3) as shown by the thin arrow in FIG. 1 and entrains the sediment S deposited on the sedimentation site (4). And flow downstream.

[0008] In this way, the sediment S deposited on the sedimentation site (4) is naturally discharged into the river (1) during the flood and flows down. Impact on rivers is reduced.

FIG. 3 shows another embodiment of the present invention.
In this embodiment, a step (3A) is used instead of the weir (3) of the previous embodiment.
Is formed, and the high step is used as a sedimentation area (4A). The step (3
A) may be artificial or naturally formed. Even in this embodiment, at normal times (water level L ₁ ), the water of the river (1) is interrupted by the step (3A) and flows outside thereof.
At the time of a small flood (water level L ₂ ) or more, the vehicle climbs over the step (3A) and flows down along with the sediment S deposited at the sedimentation site (4A).

[0010]

According to the present invention, as described above, the sediment generated by the excavation of the dam sediment is naturally removed only at the time of the flood, so that no human labor is required and the influence of the sediment on the river is small. .

[Brief description of the drawings]

 1 and 2 show an embodiment of the present invention.

FIG. 1 is a partially omitted plan view.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view corresponding to AA in FIG. 1 of another embodiment of the present invention.

[Explanation of symbols]

 1 River 1A Wide section 2 Dam 3 Weir 3A Step 4,4A Sedimentation site S Sediment

Claims (2)

(57) [Claims] 1. A provided weir defines a sedimentation field rivers Hirohaba portion of the dam downstream, a configuration that allowed to deposit drilled dams sediment in該土sand dumps, the height of the weir of river set lower than high and flooding when water levels than normal water level, dam sedimentation processing method for causing to flow down sediment downstream that is deposited該土sand dumps during floods (2) A step is provided in a wide portion of a river downstream of a dam to make the soil
Compile the deposition area, Excavation of dam sediment at the sedimentation site
It is a configuration that can be stacked, Sand deposit
The height of the sedimentation pit is higher than the normal
water Lower than the water level during the flood, and
Downstream of piled earth and sand Characterized by flowing down
Mud treatment method