JP4102919B2 - Method of dredging sediments in reservoirs - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is related to a dredging how the sediment in reservoirs.
[0002]
[Prior art]
In general, there is almost no flow of water in the dam lake, so sediments such as fine-grained soil called floating road and floating sand that have flowed along with muddy water accumulate on the bottom of the lake. When this amount of sediment is increased, the amount of stored water decreases and the original function of the dam cannot be exhibited, so dredging is performed by various methods.
[0003]
[Problems to be solved by the invention]
However, the wash road with an average particle size of about 0.017 mm and suspended sand with a particle size of 0.15 to 0.25 mm are deposited as a thin layer over the entire lake bottom, so the dredging area becomes wide. There was a problem that efficient dredging was not possible.
[0004]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a method capable of efficiently dredging sediment sediment in a reservoir such as a dam lake.
[0005]
In order to solve the above problems, the method for dredging sediment in the reservoir according to the present invention includes a lateral dike protruding in a lateral direction so as to block a part of the inflow slope road upstream of the inflow slope road into which water flows. And a longitudinal dike constructed along the inflow slope from the tip of the horizontal dike to the bottom of the lake, and the muddy water containing earth and sand is transferred to a certain part of the reservoir by the dike It is characterized in that the soil and sand are discharged after being poured into a certain location and accumulated at this fixed location. Further, it is included that the guide channel is formed to be gradually wider from the upstream side to the downstream side. In addition, it includes that certain places in the reservoir are easy to accumulate sediment. In addition, a sediment accumulation part is formed at a certain location of the reservoir, and the sediment accumulation part is constructed so that it crosses the outflow outlet at an appropriate distance from the tip of the longitudinal dike and the sediment accumulation area near the outflow outlet. Including that formed by the dam. In addition, the discharge of the earth and sand, the suction port of the discharge pipe is installed in the sediment accumulated in a fixed place, the discharge port is installed below the suction port, and at least one suction pipe is connected to the suction port The suction pipe includes an outer cylinder and a rotatable inner cylinder inserted into the outer cylinder, and includes a scissor device in which a hole that opens and closes by rotation of the inner cylinder is opened in the outer cylinder. Further, the inner cylinder includes rotation by driving means. In addition, it includes that the suction pipe is radially attached to the suction port. In addition, the suction port and the drive means are covered with a suction cover.
[0007]
Since muddy water containing earth and sand such as wash road and floating sand flows into the reservoir such as dam lake through the earth and sand guide channel, the earth and sand such as wash road and floating sand is not in the predetermined place of the reservoir, that is, the entire reservoir, It can be accumulated in a certain place. Moreover, by accumulating earth and sand at a certain place of the reservoir, it is possible to perform an efficient dredging work and to accumulate earth and sand at a place where the most efficient dredging work can be performed. It is possible to accumulate earth and sand such as wash load and floating sand that have flowed into the reservoir together with muddy water in the sediment accumulation area. In addition, the channel formed gradually wider toward the downstream side can gradually flow muddy water toward the downstream side, like a natural river. In addition, a dam provided near the outlet of the guide channel can prevent diffusion of earth and sand such as wash load and suspended sand. In addition, the moving range of the suction pipe can be reduced, and efficient dredging can be performed within this small moving range. By rotating the inner cylinder, it is possible to adjust the position of the suction port and the opening degree. The location for removing the accumulated soil can be arbitrarily changed by the radial suction pipe, and the discharge efficiency can be increased.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a dredging method for sedimentary sediment in a reservoir according to the present invention and a dredging device will be described with reference to the drawings. First, the dredging method for sedimentary sediment (hereinafter referred to as dredging method) in the reservoir will be described, and then the dredging device for sedimentary sediment (hereinafter referred to as dredging device) in the reservoir will be described. In the embodiments, the same components are described with the same reference numerals, and only different components are described with different reference numerals. In the following embodiments, a description will be given targeting a dam lake as a reservoir.
[0009]
As shown in FIGS. 1 and 2, the dredging method of the present invention allows muddy water 6 to flow from an earth and sand guiding channel (hereinafter referred to as a guiding channel) 3 formed in a water inflow slope channel 2 in a dam lake 1. The contained sand and sand 7 such as wash load and floating sand is collected in a sediment accumulation unit (hereinafter referred to as a collection unit) 5 near the outlet 4 and discharged by the dredging device 8.
[0010]
The diversion channel 3 includes a horizontal dike 9 provided on the upstream side of the inflow slope 2 and a vertical dike 10 built on the inflow slope 2 from the tip of the horizontal dike 9 to the bottom of the lake. It is configured. The horizontal dike 9 and the vertical dike 10 are constructed by accumulated soil discharged from the lake bottom, and the former blocks a part of the inflow slope 2 from the right bank (toward the downstream side) to the left bank. In this way, the latter is constructed so that the conduit 3 gradually becomes wider from the front end of the lateral diversion dike 9 to the bottom of the lake. A silt protector 10b is formed on the submerged dike portion 10a from the submerged portion of the longitudinal dike 10 to the tip portion.
[0011]
In the same way as natural rivers, the channel 3 formed in this way is gradually and slowly muddy water (hereinafter simply referred to as muddy water) 6 containing earth and sand 7 such as wash load and suspended sand from the upstream side to the downstream side. The flow stops near the outflow port 4 corresponding to the river mouth, and the earth and sand 7 settles where this flow stops.
[0012]
Further, although the guide channel 4 is formed on the left bank side in FIG. 1, whether it is formed on the left or right side is determined in consideration of the hydraulic characteristics and topographic characteristics of the dam lake 1. Furthermore, when the water depth of the inflow slope 2 is shallow, it is also possible to form the guide channel 3 with only the silt protector 10b or only with the longitudinal dike 10.
[0013]
The accumulation unit 5 includes a sediment accumulation area (hereinafter referred to as an accumulation area) 11 and a dam 12. Thus, the dam 12 formed around the accumulation area 11 forms a recess surrounding the earth and sand 7 such as a wash load and floating sand near the outlet 4. Therefore, the turbid water 6 separated from the large stone by the diversion bank 13 flows into the accumulation area 11 from the channel 3 and is not diffused to the other by the dam 12.
[0014]
On the other hand, in the dredging device 8, the discharge pipe 14 is installed from the accumulation part 5 of the dam lake to the bypass tunnel 16 through the auxiliary tunnel 15, the suction port 17 is installed in the earth and sand 7 of the accumulation unit 5, and the discharge port 18 is bypassed. It is a siphon type installed in the tunnel 16. Further, a radial branch pipe 19 is connected to the suction port 17, and a suction pipe 21 is connected to the branch pipe 19 via a connecting pipe 20, and the tip of the suction pipe 21 is supported by a cradle 22. The branch pipe 19 and a part of the connecting pipe 20 are covered with a suction cover 23 that protects a motor and the like to be described later from water, and the suction pipe 21 projects radially from the suction cover 23.
[0015]
The suction pipe 21 includes an outer cylinder 24 fixed by a cradle 22 and a suction cover 23 and an inner cylinder 25 inserted into the outer cylinder 24, and the inner cylinder 25 is connected to the connecting pipe 20. The connecting pipe 20 is provided with an automatic valve 26 so that the earth and sand 7 can be sucked from an arbitrary suction pipe 21 by opening and closing. For example, in FIG. 3, when a large amount of earth and sand 7 is accumulated on the front side (right side) of the accumulation unit 5, the automatic valve 26 of the front connection pipe 20 is opened and the automatic valve in the rear connection pipe 20 is opened. 26 is closed. On the other hand, when a large amount of earth and sand 7 is accumulated on the rear side (left side) of the accumulation unit 5, the above is reversed. By such opening / closing operation of the automatic valve 26, the earth and sand 7 can be sucked from an arbitrary place.
[0016]
In addition, as shown in FIG. 7, the outer cylinder 24 is provided with sediment suction holes 27 so as to form spirals at appropriate intervals, whereas the inner cylinder holes 28 are linear with appropriate intervals. Is open. A bearing 30 sealed with a dust seal 29 is provided between the inner cylinder 25 and the outer cylinder 24 and between the inner cylinder 25 and the connecting pipe 20, and a gear 33 of a motor 32 installed on the outer cylinder 24 is provided. The inner cylinder 25 can be rotated by meshing with the gear 31 on the outer periphery of the inner cylinder. Therefore, the rotation of the inner cylinder 25 by the driving of the motor 32 can adjust the position variation and the opening degree of the sediment suction hole 27.
[0017]
Therefore, the earth and sand 7 accumulated in the accumulating unit 5 is sucked up by the siphon effect and discharged to the bypass tunnel 16 through the discharge pipe 14. In this case, when the automatic valve 26 is opened and closed in accordance with the accumulation state of the sand and sand 7 as described above, dredging that is efficient and has a high mud content can be performed. Furthermore, the variation of the position of the suction hole 27 by the rotation of the inner cylinder 25 and the adjustment of the opening degree, for example, by sequentially opening and sucking from the hole 27 on the front end side of the suction pipe 21 to the rear end side, the mud content is reduced. You can make a higher level of dredging.
[0018]
In the present embodiment, three dredging devices 8 are installed, but this is not limited to three, and may be more or less.
[0019]
Further, the suction pipe 21 is not limited to the radial arrangement as described above, but may be one, and may be arranged as shown in FIGS. 9 and 10 according to the accumulation state of the earth and sand 7. These dredging devices 34 and 35 are different in the arrangement of the suction pipe 21, and other than this, the dredging devices 34 and 35 have the same configuration as the dredging device 8 described above, and are dredged in the same manner.
[0020]
Further, in the present embodiment, accumulation of earth and sand 7 is performed in the guiding channel 3, but this accumulation is not limited to the guiding channel 3, and can also be performed by, for example, a pipe (not shown).
[0021]
Moreover, although the accumulation | storage part 5 was formed in the dam 12, it can also be formed in the natural hollow part using the topography of the dam lake 1. FIG. Furthermore, by arbitrarily changing the installation location of the above-described guide passage 3 and pipe, a location where the dredging work of the earth and sand 7 can be efficiently performed, for example, a location where the dredging device 8 can be easily installed, It can also be accumulated in simple places.
[0022]
【The invention's effect】
Since muddy water flows into the reservoir through the guide channel, earth and sand such as wash load and floating sand can be accumulated at a predetermined location of the reservoir, that is, at a certain location rather than the entire reservoir.
[0023]
By accumulating earth and sand such as wash roads and suspended sand at a certain location in the reservoir, it is possible to perform efficient dredging work at one place and to accumulate earth and sand at the most efficient dredging work place. it can.
[0024]
Wash load and floating sand that have flowed into the reservoir along with muddy water can be accumulated in the accumulation area.
[0025]
The guide channel formed gradually wider toward the downstream side can gradually flow muddy water toward the downstream side, like a natural river.
[0026]
Sediment diffusion can be prevented by a dam provided near the outlet of the conduit.
[0027]
The moving range of the suction pipe can be reduced, and efficient dredging can be performed in this small moving range.
[0028]
By rotating the inner cylinder, it is possible to adjust the position of the suction port and the opening degree.
[0029]
With the radial suction pipe, it is possible to arbitrarily change the target position for removing the accumulated soil, and the discharge efficiency can be increased.
[0030]
By using the accumulated soil discharged from the bottom of the reservoir, the longitudinal dike and the dam are built, so that the accumulated soil can be used effectively.
[Brief description of the drawings]
FIG. 1 is a plan view of a dredging device installed on a dam lake.
FIG. 2 is a cross-sectional view of FIG.
FIG. 3 is a plan view of a dredging device installed in a dam lake.
4 is a cross-sectional view of FIG. 3. FIG.
5A is a cross-sectional view of a branch pipe connected to a discharge pipe, and FIG. 5B is a plan view of the branch pipe.
FIG. 6 is a cross-sectional view of the suction pipe.
7A and 7B are plan views of an outer cylinder and an inner cylinder.
FIG. 8 is a partially omitted cross-sectional view of the suction pipe.
FIG. 9 is a plan view of another dredging device installed in the dam lake.
FIG. 10 is a plan view of another dredging device installed in a dam lake.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dam lake 2 Inflow slope path 3 Conduction flow path 4 Outlet 5 Accumulation part 6 Muddy water 7 Sediment 8, 34, 35 Dredging device 9 Lateral dike 10 Longitudinal dike 10a Submerged dike part 10b Silt protector 11 Accumulation area 12 Weir 13 Branch dike 14 Discharge pipe 15 Auxiliary tunnel 16 Bypass tunnel 17 Suction port 18 Discharge port 19 Branch pipe 20 Connecting pipe 21 Suction pipe 22 Receiving base 23 Suction cover 24 Outer cylinder 25 Inner cylinder 26 Automatic valve 27, 28 Hole 29 Dust seal 30 Bearing 31, 33 Gear 32 Motor

Claims (8)

A horizontal dike projecting laterally so as to block a part of the inflow slope road upstream of the inflow slope road into which water flows, and along the inflow slope road from the tip of the horizontal dike to the lake bottom Form a water channel composed of a longitudinal dike that has been built, and pour muddy water containing earth and sand into a certain location of the reservoir through this water channel, collect the sediment at this certain location, and then discharge this sediment. A method for dredging sediments in a reservoir characterized by The method for dredging sediment in the reservoir according to claim 1 , wherein the conduit is formed so as to be gradually wider from the upstream side to the downstream side. The method for dredging sedimentary sediment in a reservoir according to claim 1 or 2 , characterized in that a certain portion of the reservoir is a place where sediment is easily collected. A sediment accumulation part is formed at a certain location of the reservoir, and the sediment accumulation part is built so as to cross the exit at an appropriate distance from the sediment accumulation area in the vicinity of the exit and the tip of the longitudinal dike. The method for dredging sedimentary sediment in a reservoir according to any one of claims 1 to 3 , wherein the method is formed by a dam. Discharge of sediment, inlet of the discharge tube is installed in the soil, which is integrated in a fixed position, the discharge port below the suction plug mouth is installed, the suction pipe of at least one in the suction port features are connected, intake pipe is an outer cylinder composed of a rotatable inner cylinder which is inserted thereto, that the hole opened and closed by rotation of the inner cylinder is performed in the dredging device comprising an opening in the outer tube The method for dredging sediment in the reservoir according to claim 1. 6. The method for dredging sediment in the reservoir according to claim 5 , wherein the inner cylinder is rotated by driving means. The method for dredging sediment in the reservoir according to claim 5 or 6 , wherein suction pipes are attached radially to the suction port. 8. The method for dredging sediment in the reservoir according to claim 7 , wherein the suction port and the driving means are covered with a suction cover.

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