JPH1046556A - Sediment inflow preventive device on dam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove sediment flowing into a dam by blocking it on the upstream side of the dam by providing a weir having a channel of roughly the same width of a river in the neighbourhood of the inflow side of the river communicated to the dam and doubly providing inclined grooves furnished with sediment removing mechanisms on both sides of the weir. SOLUTION: A little longer weir 1 having a channel 1a roughly equal in width to a river A is provided in the neighbourhood on the inflow side of the river A communicated to a dam D. Additionally, inclined grooves 4, 4 inclined at a specified inclination from the upper side of the river toward the lower side of the river and furnished with sediment removal mechanisms 8 to remove sediment B are doubly provided on both sides of the weir 1. Thereafter, a group of the sediment B flowing with liquid separated by a pier 2 is sequentially transferred to removal conveyors 5, 5 of the sediment removal mechanisms 8, dropped on a delivery conveyor 7 separately provided from a reversing position on an upper end of the removal conveyor 5 and delivered to a sediment accumulation site provided in the transfer direction of the delivery conveyor 7. Consequently, it is possible to block and remove the sediment flowing into the dam on the upstream side of the dam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to an improvement of the prior application of Japanese Patent Application No. 7-28687, in which the amount of water stored in the dam is close to the design by blocking and eliminating earth and sand flowing into the dam at the upstream side of the dam. It is intended to be able to maintain the condition, to simplify the structure, and to improve the ability to remove earth and sand.

[0002]

2. Description of the Related Art Conventionally, in existing dams, the amount of sediment inflow over the years is far greater than the amount of dredging and is almost untouched. When droughts drought during power demand, water savings were plagued like an annual event.

[0003]

Conventionally, as described above, since the amount of sediment flowing into the dam far exceeds the amount of dredging, the amount of sediment flowing into the dam is reduced as much as possible, so that the water is already stored. Due to the drastic reduction in volume, the rehabilitation of existing dams, even those at risk, is eagerly awaited. The present invention
Between the outlet of the river flowing into the dam and the entrance of the dam, a relatively long weir having a flow path of substantially the same width as the river and having a relatively long weir in the flow direction of the river is provided. An eaves type that has a slope with a sediment removal mechanism that removes the sediment that flows through the weir and removes it outside the weir, and prevents it from rising by the turbulent flow at the time of rising water at the jetty on the inflow side of the weir By providing the protruding edge, it is an object to surely prevent and remove the earth and sand which are swept away by the turbid current at the time of increasing the water by the weir.

[0004]

The weir constructed as described above has a water level higher than the normal water level, so that the flowing water rises to the height of the eave-shaped ridge of the weir, and climbs over the eave-shaped rim. It flows into the flow path, flows down the flow path, and flows out to the dam. At this time, any fine earth and sand mixed in the running water flows along the riverbed by its own weight, so naturally it collides with the jetty of the weir and flows along the wall surface of the jetty while being distributed to the left and right by the jetty. It flows into the inclined groove communicating with the terminal, is successively transferred by fluid pressure onto the removing conveyor of the earth and sand removing mechanism provided in the inclined groove and inclined upward in the transport direction, and another transfer is performed from the upper end of the removing conveyor. It is transferred to the conveyor and carried out to the sediment collection site via the unloading conveyor, and this process is intermittently operated every few hours or every few days during normal times, and is continuously operated for 24 hours when water is increased, so that sediment flows into the dam. Is definitely blocked.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings. The weir (1) shown in FIGS. 1 and 2 is located near the inflow side of a river (A) flowing into a dam (D). A long weir (1) having a flow path (1a) substantially equal to the river width of the river (A) is formed, and a jetty (2) upstream of the weir (1) for diverting the flow of the river (A) ) Is formed and an eave-shaped ridge (3) is formed above the pier (2) to prevent floating of earth and sand (B) that is pushed up on the wall surface of the pier (2) due to turbidity when the water is increased.

As shown in FIGS. 1 and 2, the inclined grooves (4, 4) are inclined upward at a predetermined inclination angle from the upper stream to the lower stream along both sides of the weir (1). At the lower end of (4), holes (6, 6) for accommodating one end of an exclusion conveyor (5) for carrying out earth and sand (B) are formed, and the exclusion conveyor (5, 5) The jetty (2)
The sediment (B) group, which flows together with the fluid, is sequentially transferred and dropped from the reversing position of the upper end of the removal conveyors (5, 5) onto a separately provided carry-out conveyor (7, 7). Sediment removal mechanism (8, 8) to be carried out to a sediment collection site (not shown) provided in the transfer direction of (7, 7)
Is configured.

As shown in FIGS. 1 and 2, a guard (9) is provided between the end of the river (A) and the jetty (2).
It is installed firmly by concrete with a required interval (T), and when the river (A) rises, the guard (9) prevents the rock (C) pushed by the turbid current. In these rocks (C), the slopes (4,
4) to prevent destruction and damage of the reject conveyors (5, 5). When the flow returns to normal, these rocks (C) are removed by a shovel (not shown),
It is configured to be prepared next.

[0008]

Since the present invention is configured as described above, it has the following effects.

At a portion where the dam and the river flowing into the dam are connected, there is a jetty having a substantially V-shaped flat cross section, a width almost equal to the river width, and a long groove shape in the flow direction of the river. Since the weir having the flow path is provided, the sediment and the rock which are going to flow into the dam can be reliably captured regardless of whether the river rises or in normal times.

At the protruding end of the weir, earth and sand and mud which are swept away by the flow of water and muddy water are guided to diagonal grooves provided on both sides of the weir via a jetty provided on the upstream side of the weir, and provided on the diagonal groove. Since the transfer is made to the reject conveyor, sediment and mud flowing due to the turbid flow can be reliably captured.

The slopes provided on both sides of the weir are formed so that the slopes of the slopes are gradually increased in the direction of flow of the water. It prevents any incoming sediment and mud from climbing over the weir and flowing into the flow path of the weir.

A guard is provided on the upstream side of the weir to prevent the rock from flowing down, so that the rock that is swept away at the time of rising water may collide with the jetty of the weir, or climb on the elimination conveyor in the slope. In addition, breakage of the jetty and the reject conveyor can be reliably prevented.

[0013] By installing the weir according to the present invention, not only can the newly installed dam maintain the planned amount of water storage at the time of design, but also a sudden decrease in the amount of water storage in the existing dam can be stopped.
In addition, by eliminating the accumulated sediment by the conventional water discharge, it is possible to reliably prevent the precious water from being wasted and the downstream river or coast from being polluted by a large amount of the released sediment and mud.

The weir according to the present invention has good elimination efficiency of earth and sand in spite of its structural simplicity, and its construction cost is very low. Therefore, it is possible to prevent a decrease in the amount of stored water due to the accumulation of sediment every time the water is increased, and it is also possible to eliminate wasteful cost of dredging that is repeatedly performed.

[Brief description of the drawings]

FIG. 1 is a partially omitted plan view of a weir according to the present invention.

FIG. 2 is a side sectional view of the ZZ line in FIG. 1 partially omitted;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weir 2 Jetty 3 Eave-shaped ridge 4 Sloping groove 5 Exhaust conveyor 6 Hole 7 Unloading conveyor 8 Sediment removal mechanism 9 Guard A River B Sediment C Rock D Dam

Claims (2)

[Claims] 1. A flow path (1a) in the vicinity of the inflow side of a river (A) leading to a dam (D), substantially equal to the river width of the river (A).
A weir (1) having a weir is provided, and on both sides of the weir (1),
An apparatus for preventing inflow of sediment in a dam, comprising a slope (4, 4) provided with a sediment removing mechanism (8, 8) for removing soil (B). 2. A weir (1) according to the first aspect, comprising a jetty (2) for distributing earth and sand (B) flowing to the inflow side of the river to the left and right, and a turbulent flow at the time of increasing water on an upper portion of the jetty (2). An apparatus for preventing inflow of sediment in dams, comprising an eave-shaped ridge (3) for preventing rising soil (B) from flowing into a flow path (1a) of a weir (1).