Desilting facility under water storage condition of river reservoir

Abstract

The utility model discloses a desilting facility under the water storage condition of a river reservoir, which comprises an original dam, a transverse cofferdam for transversely cutting off a river is built on the upstream of the original dam, a dam for transversely cutting off the river is built on the upstream of the transverse cofferdam, and a water area between the transverse cofferdam and the original dam is a water storage area of the reservoir. A water area between the dam and the transverse cofferdam is a desilting area, a desilting pipe is built at the bottom of the water storage area in a buried mode, an upstream pipe opening of the desilting pipe penetrates through the transverse cofferdam and then is located in the desilting area, a downstream pipe opening of the desilting pipe is connected with a water drainage facility of an original dam, and a clear water pipe is built in the desilting area. An upstream pipe opening of the clear water pipe is connected to the dam, and a downstream pipe opening of the clear water pipe penetrates through the transverse cofferdam and then is located in the water storage area. The device effectively solves the contradictory problems of water storage in the flood season and sand discharge and desilting of an empty reservoir, and water resources can be fully utilized.

Description

Technical Field

[0001] This utility model belongs to the field of water conservancy engineering technology, and in particular relates to a sediment removal facility under the condition of river reservoir water storage. Background Technology

[0002] The conventional method for sediment discharge in existing reservoirs is to operate with empty reservoirs during the flood season, allowing all incoming water and sediment to flow freely. This means that the reservoirs cannot effectively store and supply water during sediment discharge, resulting in a waste of water resources. Utility Model Content

[0003] In view of the problems existing in the prior art, the purpose of this utility model is to provide a sediment removal facility under the condition of river reservoir water storage.

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] A sediment removal facility for a river reservoir includes an existing dam, a transverse cofferdam upstream of the existing dam that transversely blocks the river, a dam upstream of the transverse cofferdam that transversely blocks the river, the water area between the transverse cofferdam and the existing dam being the reservoir's storage area, and the water area between the dam and the transverse cofferdam being a sedimentation area. A sediment removal pipe is buried underground at the bottom of the storage area. The upstream outlet of the sediment removal pipe passes through the transverse cofferdam and is located within the sedimentation area. The downstream outlet of the sediment removal pipe is connected to the water release facility of the existing dam. A clear water pipe is constructed within the sedimentation area. The upstream outlet of the clear water pipe is connected to the dam. The downstream outlet of the clear water pipe passes through the transverse cofferdam and is located within the storage area. A sluice gate is installed on the dam at the upstream outlet of the clear water pipe.

[0006] Preferably, the clear water pipe is constructed along the riverbank on one side of the sedimentation zone, and a longitudinal cofferdam is constructed within the sedimentation zone to separate the sedimentation zone from the clear water pipe.

[0007] Preferably, the sluice gate is a diversion gate.

[0008] The beneficial effects of this utility model are:

[0009] Compared with existing technologies, the advantages of this utility model are:

[0010] This invention introduces clean water during the non-flood season into the water storage area by burying sand discharge pipes in the water storage area and constructing clean water pipes in the sedimentation area. During the flood season, the river water with high sand content is directly discharged into the downstream river channel, avoiding the accumulation of silt in the water storage area. This eliminates the need to empty the water storage area for dredging, effectively solving the contradiction between water storage during the flood season and the need for emptying the reservoir for sand discharge and dredging, and making full use of water resources. Attached Figure Description

[0011] Figure 1 This is a plan view of the present invention;

[0012] Figure 2 This is a longitudinal sectional view of the water storage area and sedimentation area of ​​this utility model. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1-2 This utility model provides a technical solution: a sediment removal facility for a river reservoir, comprising an existing dam 1, a transverse cofferdam 2 constructed upstream of the existing dam 1 to transversely block the river, a dam 3 constructed upstream of the transverse cofferdam 2 to transversely block the river, the water area between the transverse cofferdam 2 and the existing dam 1 being the reservoir's water storage area 4, and the water area between the dam 3 and the transverse cofferdam 2 being the sedimentation area 5, a sediment removal pipe 6 being buried at the bottom of the water storage area 4, the upstream end of the sediment removal pipe 6 passing through the transverse cofferdam 2 and located within the sedimentation area 5, the downstream end of the sediment removal pipe 6 being connected to the water release facility 11 of the existing dam 1, a clear water pipe 7 being constructed within the sedimentation area 5, the upstream end of the clear water pipe 7 being connected to the dam 3, the downstream end of the clear water pipe 7 passing through the transverse cofferdam 2 and located within the water storage area 4, and a sluice gate 8 being installed on the dam 3 at the upstream end of the clear water pipe 7.

[0015] Specifically, a transverse cofferdam 2 is constructed at a suitable location between the existing dam 1 and the end of the reservoir area, generally at the upstream 1 / 3 of the entire reservoir area. The cofferdam fill material can be sourced from nearby reservoir sediment with added solidifying agent, dividing the entire reservoir into a sedimentation zone 5 and a water storage zone 4. A clear water pipe 7 is constructed on one side of the sedimentation zone 5, with a diameter determined by hydrological calculations, generally not exceeding 1.5 meters. The upstream outlet of the clear water pipe 7 is located at the upstream tail of the reservoir. To ensure water intake for the clear water pipe 7, a dam 3 and a sluice gate 8 are constructed at a narrow section of the river at the tail of the reservoir that facilitates water diversion, allowing upstream water to enter the clear water pipe 7 later. The buried sediment discharge pipe 6 within the water storage zone 4 is generally implemented after the reservoir is emptied. Its diameter is determined by hydrological calculations, generally 2-3 meters. The upstream outlet of the sediment discharge pipe 6 is located within the sedimentation zone 5, and its downstream outlet connects to the existing reservoir's discharge facility 11, discharging water into the downstream river channel. For the implementation of the sand drainage pipe 6, reinforced concrete structure is preferred. When the excavation is difficult, the pipe jacking method can also be used.

[0016] During the non-flood season, when the river water has low sediment content and the river water is relatively clear, the sluice gate 8 is opened, and the river water enters the downstream reservoir 4 directly through the clear water pipe 7 for normal water storage operation. When the river is turbid and the river water has high sediment content during the flood season, the sluice gate 8 is closed, and the river water overflows the dam 3 and enters the empty sedimentation zone 5, realizing empty reservoir sediment discharge. The river water containing sediment passes through the sedimentation zone 5 and washes away the sediment carried by the previous siltation. The sediment is discharged from the reservoir through the buried sediment discharge pipe 6 and the original reservoir's water release facilities 11, reducing sediment accumulation in the reservoir area.

[0017] This utility model introduces clean water during the non-flood season into the water storage area 4 by burying a sand discharge pipe 6 in the water storage area 4 and constructing a clear water pipe 7 in the sedimentation area 5. During the flood season, the river water with high sand content is directly discharged into the downstream river channel, avoiding the accumulation of silt in the water storage area 4. This eliminates the need to empty the water storage area 4 for dredging, effectively solving the contradiction between water storage during the flood season and the need for emptying the reservoir for sand discharge and dredging, and making full use of water resources.

[0018] Furthermore, the clear water pipe 7 is constructed along the riverbank on one side of the sedimentation zone 5. A longitudinal cofferdam 9 is constructed in the sedimentation zone 5 to separate the sedimentation zone 5 from the clear water pipe 7, thereby isolating the dust and silt in the sedimentation zone 5, preventing the clear water pipe 7 from being covered, and facilitating maintenance.

[0019] Furthermore, the sluice gate 8 is a diversion gate, which facilitates the intake of water into the clear water pipe 7.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sediment removal facility for river reservoirs under water storage conditions, characterized in that, The reservoir includes an existing dam (1), a transverse cofferdam (2) that blocks the river is built upstream of the existing dam (1), a dam (3) that blocks the river is built upstream of the transverse cofferdam (2), the water area between the transverse cofferdam (2) and the existing dam (1) is the reservoir's storage area (4), the water area between the dam (3) and the transverse cofferdam (2) is the sedimentation area (5), a sediment discharge pipe (6) is buried at the bottom of the storage area (4), and upstream of the sediment discharge pipe (6) After passing through the transverse cofferdam (2), the pipe is located in the sedimentation zone (5). The downstream outlet of the discharge pipe (6) is connected to the water release facility (11) of the original dam (1). A clear water pipe (7) is built in the sedimentation zone (5). The upstream outlet of the clear water pipe (7) is connected to the dam (3). The downstream outlet of the clear water pipe (7) passes through the transverse cofferdam (2) and is located in the water storage zone (4). A sluice gate (8) is set on the dam (3) at the upstream outlet of the clear water pipe (7).

2. The sediment removal facility under river reservoir impoundment conditions according to claim 1, characterized in that, The clear water pipe (7) is built along the riverbank on one side of the sedimentation zone (5), and a longitudinal cofferdam (9) is built in the sedimentation zone (5) to separate the sedimentation zone (5) from the clear water pipe (7).

3. The sediment removal facility under river reservoir impoundment conditions according to claim 1, characterized in that, The sluice gate (8) is a diversion gate.

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