JP3806325B2 - Sand removal method by overturning weir - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sand removal method using a tipping weir that can be installed in a river or the like, can store river water at a predetermined water level, and can remove sediment or the like accumulated in a depression.
[0002]
[Prior art]
Conventionally, the overturning weir 1 installed in a form crossing a river will be described with reference to FIGS. 4 (A, A ′) (B, B ′) showing a cross section and FIG. 4 (C) showing a right side.
The falling weir 1 shown in FIG. 4 (A) is made of a rectangular plate, and is attached to a rotating shaft 2 that can be slidably rotated on a bearing body 10 provided on the river bed at an appropriate interval. The rotational friction of the rotating shaft 2 is reduced. Therefore, as shown in FIG. 4C, a through hole 18 is formed between the rotating shaft 2 and the river bed 19.
Further, on the upstream side of the rotating shaft 2, a water stop body (rubber plate or the like) that can be placed and contacted on the rotating shaft 2 via a support 9 fixed to a concrete slab 13 installed on the river bed. 8 is provided, and the waterstop 8 prevents downstream discharge from the through hole 18 formed in the lower portion of the rotating shaft 2.
[0003]
Then, the rotating shaft 2 is rotated via a driving body (not shown), and the overturning weir 1 is set at a predetermined angle on the downstream side to store river water at a predetermined water level.
In addition, an S-shaped sand discharge chute 5 that increases the flow speed is provided downstream of the overturning weir 1, and the water overflowing the overturning weir 1 increases the flow speed with the sand discharge chute 5 to the river bed. The sediment deposited in the depression 3 in which concrete is placed is discharged downstream.
Therefore, at the time of flooding, the overturning weir 1 is inclined to the downstream side and falls into the depression 3 as shown in FIG.
[0004]
Further, as another measure for removing sediment and the like deposited on the downstream side of the overturning weir 1, as shown in FIG. 4 (B, B ′), the downstream side of the overturning weir 1 shown in FIG. In some cases, a current plate 6 is installed. In addition, this baffle plate 6 is installed in the position which does not become obstructive when the falling weir 1 falls down on the downstream side.
A part of the water flow including earth and sand overflowing the overturning weir 1 is conveyed to the downstream side via the rectifying plate 6, and a part of the water flow is entangled upstream of the rectifying plate 6, and the depression 3 The sediment is transported downstream.
[0005]
[Problems to be solved by the invention]
If the sand discharge chute 5 shown in FIG. 4 (A) is provided on the downstream side of the overturning weir 1, driftwood or the like may close the inlet of the sand discharge chute 5 and cause a decrease in the sand discharge function. Further, when the falling weir 1 is fallen over, the sand discharge chute 5 is also fallen down, so the depression 3 needs to be formed deeply, and the deep depression 3 makes it easier to deposit.
In addition, when the rectifying plate 6 shown in FIG. 4B is installed, the effect is exhibited if the overflow of the overturning weir 1 flows down on the rectifying plate 6, but the overflow flow is small. Since it flows down to the upstream side of the current plate 6, it is easy to deposit and also easily deposits in the lower part of the current plate 6.
As described above, since the overturning weir 1 shown in FIGS. 4A and 4B has a problem in removing sediments and the like deposited in the depressions 3, the present invention easily falls over the sediments and sediments deposited in the depressions. A method of sand removal by a weir is provided.
[0006]
[Means for Solving the Problems]
The sand discharging method by the overturning weir of claim 1 has the following configuration, and the overturning weir is installed in a river and attached to a rotating shaft for storing river water. In addition, a waterstop body that can be placed in contact with the rotating shaft is provided, and a concave portion is formed on the rotating shaft.
[0007]
And at the time of storage, a water stop body maintains mounting contact in a fall dam, and a fall dam is inclined. The falling weir is prevented from leaking from the rotating shaft by the waterstop, and when the river water is stored at a predetermined water level, the falling weir is inclined from the vertical state to the downstream angle (β).
On the other hand, when discharging sediment deposited in the depression formed on the downstream side of the overturning weir, by tilting the overturning weir from the vertical state to the upstream side angle α1, the waterstop is inserted into the concave portion. It is a stream of water that drains vigorously through the formation through-hole, and transports sediment sediment to the depression downstream of the overturning weir.
Therefore, during a flood, the falling weir can fall into a depression so as not to obstruct running water.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
An embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the components etc. which have the same function as the past.
The rectangular tipping weir 1 made of a steel plate material with flat front and back surfaces is installed in a state of crossing the river, and is placed on the bearing body 10 provided on the river bed at an appropriate interval. Since it is attached to a rotating shaft 2 made of iron or the like that can rotate, the rotational friction of the rotating shaft 2 is reduced.
Further, as shown in FIG. 4C, a through hole 18 is formed between the bearing body 10 and the lower portion of the rotating shaft 2 between the bearing body 10 and the river bed 19.
[0009]
Further, on the upstream side of the rotating shaft 2, a flexible water stop body that can be placed on and contacted to the rotating shaft 2 via a support 9 fixed to a concrete slab 13 installed on the river bed. (Rubber plate or the like) 8 is provided, and the waterstop 8 is in close contact with the rotating shaft 2, thereby preventing downstream discharge.
Further, the overturning weir 1 is positioned on the upstream side and the downstream side by the rotation of the rotation shaft 2 by a driving body (not shown), and will be described in detail later. By setting to β), a predetermined water level can be stored.
[0010]
Next, the sand discharging method using the overturning weir will be described with reference to FIG.
(1) Storage of a predetermined water level (FIG. 2 (A))
When maintaining a predetermined water level, the rotating shaft 2 is rotated clockwise through a driving body (not shown), and the overturning weir 1 is set at a predetermined angle (β) on the downstream side. Depending on the height (inclination angle β) of the overturning weir 1, the water can be stored at a predetermined water level (FIG. 2A).
Further, the water stop body 8 such as a flexible rubber plate maintains the mounted state on the rotation shaft 2, and the water stop body 8 and the rotation shaft 2 are in a closed state, and a through hole formed in the lower portion of the rotation shaft 2. Leakage from 18 is prevented, and sand or the like does not bite into the gap between the rotation shaft 2 and the bearing body 10, so that the rotation shaft 2 can be rotated smoothly.
On the other hand, during a flood, the overturning weir 1 can be further inclined to the downstream side, and the overturning weir 1 can fall down into the depression 3 so as not to obstruct running water (FIG. 2 (B)).
[0011]
(2) Removal of accumulated sand, etc. (Fig. 2 (C))
As described above, when the falling weir 1 is maintained at the angle β and the water level is maintained, sediment or the like is accumulated in the downstream portion of the falling weir 1 (the depression 3 in which concrete is placed on the river bed).
Therefore, occasionally, the rotation shaft 2 is rotated counterclockwise via a driving body (not shown), and the overturning weir 1 is set at a predetermined angle (α) on the upstream side.
Due to the inclination of the overturning weir 1 to the upstream side, the overflow flows down over the overturning weir 1 at a high speed and transports the sediment in the downstream part (indentation 3) of the overturning weir 1 to the downstream side. As shown in FIG. 2B, the overturning weir 1 can fall into the depression 3.
[0012]
As described above, in the sand discharging method using the overturning weir 1 according to the present invention, the water level can be maintained by inclining the overturning weir 1 at an appropriate angle (β) on the downstream side. In addition, by inclining at an angle α, the sediment or the like deposited in the depression 3 can be removed by overflow.
[0013]
(Second Embodiment)
Next, FIGS. 3A and 3B show other configurations for removing sediments and the like accumulated in the depressions 3, and the same components in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
In the present embodiment, the configuration different from the first embodiment is that when the overturning weir 1 is set at a predetermined angle (α1) on the upstream side, the rotating shaft 2 at the location where the waterstop 8 is located, The recess 15 is formed.
The recess 15 rotates the rotating shaft 2 (the falling weir 1) counterclockwise at a predetermined angle (α1), and when the water stop 8 and the recess 15 coincide, It is formed in the size which cannot stop running water with 2.
[0014]
In order to store a predetermined water level by using the overturning weir 1 having this configuration, the rotating shaft 2 is watched via a driving body (not shown) in the same manner as the overturning weir 1 shown in the first embodiment. The tipping weir 1 is set at a downstream angle (β) (FIG. 3A).
At this time, the flexible waterstop 8 is maintained in the closed state while being placed on the rotating shaft 2, and leakage from the through hole 18 formed in the lower portion of the rotating shaft 2 is prevented and the rotating body 2 is rotated. Since sand or the like does not bite into the gap between the moving shaft 2 and the bearing body 10, the rotating shaft 2 can be smoothly rotated.
[0015]
Further, when removing the accumulated sand or the like, the overturning weir 1 is set at the upstream angle (α1) (FIG. 3B).
At this time, the water blocking body 8 is inserted into the recess 15 formed in the rotating shaft 2 so that running water cannot be blocked, and the water is discharged from the through hole formed in the recess 15 vigorously.
The flowing water generated vigorously toward the downstream is discharged through the through-hole 18 formed between the lower part of the rotating shaft 2 and the river bed 19, and the sediment in the downstream part (the depression 3) of the overturning weir 1. Is transported downstream. That is, the flowing water that flows immediately above the river bed 19 becomes a horizontal flow with respect to the deposit, and the deposit can be more reliably conveyed downstream.
[0016]
As described above, the tipping weir 1 is set at the upstream angle (α1), and the sediment 2 deposited in the depression 3 is discharged downstream with the discharged water from the recess 15, and then the rotating shaft 2 is turned clockwise. The flexible waterstop 8 is placed on the rotating shaft 2 even if it is operated so as to be rotated in the direction (downward dam 1 downstream side) to maintain a predetermined water level. The waterstop 8 is pressed by water pressure and is brought into close contact with the rotating shaft 2 to prevent leakage.
[0017]
In the first and second embodiments, the falling weir 1 is inclined to the upstream side at an angle α or α1, and the sediment deposited in the depression 3 is removed, but both states are possible. You may comprise. Moreover, in the said embodiment, although it is the structure which uses a rubber plate etc. for the water stop body 8, it may be comprised by the flexible rotating body which can rotate even if sand etc. bite.
In addition, the said hollow 3 is the concept also including the case where a river bed is flat besides showing the location dug down low from a river bed, In this case, a fall weir will fall on a river bed. Further, the present invention is a method for removing sediment deposited downstream of a tipping weir , and is not limited to the above embodiment as long as it meets this purpose.
[0018]
【The invention's effect】
In the sand discharging method using the overturning weir according to claim 1, when the overturning weir is at a predetermined angle upstream from the vertical state, a through hole is formed by the water stop and the concave portion formed in the bearing body, and the water flow from the through hole Thus, the sediment deposited in the depression formed downstream of the falling weir can be conveyed downstream.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a tipping weir of a first embodiment.
FIGS. 2A, 2B, and 2C are diagrams during operation of the overturning weir of the first embodiment.
FIGS. 3A and 3B are diagrams during operation of the overturning weir of the second embodiment.
FIGS. 4A, 4B, and 4B are cross-sectional views showing a state where a conventional falling weir is adjusted and the depression is in a depressed state, and FIG. 4C is a left side view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Falling weir 2 Rotating shaft 8 Water stop body 10 Bearing body

Claims (1)

An overturn weir installed on a rotating shaft that is installed in a river and stores river water,
A recess in the pivot shaft provided with a mounting contactable water stopping body to said rotation axis,
At the time of storage , the waterstop maintains the placing contact with the overturning weir and tilts the overturning weir from the vertical state to the downstream angle (β),
When discharging sediment deposited in the depression formed on the downstream side of the overturning weir, the waterstop is drained by inserting the water blocking body into the recess by tilting the overturning weir from the vertical state to the upstream angle (α1). A method of sand removal by a tipping weir, characterized by enabling .

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