Permanent-temporary combined hierarchical sand interception and water drainage structure and method

Abstract

The present invention discloses a permanent and temporary combined layered sand interception and water discharge structure, which includes a dam body. A slope-type layered water inlet is arranged on the upstream slope surface of the dam body. A three-way gate chamber is arranged at the bottom of the slope-type layered water inlet. A downstream control gate is arranged at the bottom of the upstream slope surface of the dam body. A buried pipe under the dam is arranged between the three-way gate chamber and the downstream control gate. The present invention also discloses a permanent and temporary combined layered sand interception and water discharge method, which includes the following steps: selecting a construction area; building a temporary diversion building structure; successively building the dam body and the slope-type layered water inlet; after the construction of the dam body and the slope-type layered water inlet is completed, sand interception and water discharge are realized. The permanent and temporary combined layered sand interception and water discharge structure and method can realize normal diversion during the construction period. By combining the water discharge through the buried pipe under the dam and the segmented sedimentation of sediment in the slope-type layered water inlet, the efficiency of the sand interception and water discharge facilities in sedimenting sediment in water and discharging clear water after sediment deposition of sediment is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sand interception and water discharge, and relates to a permanent and temporary combined layered sand interception and water discharge structure, and also relates to a permanent and temporary combined layered sand interception and water discharge method. Background Art

[0002] The sand interception dam is mainly used to intercept the sediment in the river channel during the flood season and discharge clear water, reduce the sediment deposition in the downstream river channel, improve the downstream ecological environment, and at the same time, silting can be carried out to create land in the upstream. At present, during the construction of the sand interception dam, the diversion flood is mainly discharged through a tunnel or a buried pipe under the dam, and later, the water is discharged through a water release tower in a dragon head-up manner. Due to reasons such as the generally large load of the water release tower and the large amount of foundation treatment work, the project time is long and the project investment is relatively high.

[0003] In summary, the existing technology has the problems of long construction time and low efficiency in using a water release tower for drainage during sand interception and water discharge. Summary of the Invention

[0004] The purpose of the present invention is to provide a permanent and temporary combined layered sand interception and water discharge structure, which solves the problems of long construction time and low efficiency in using a water release tower for drainage during sand interception and water discharge in the existing technology.

[0005] Another purpose of the present invention is to provide a permanent and temporary combined layered sand interception and water discharge method.

[0006] The technical solution adopted by the present invention is that the permanent and temporary combined layered sand interception and water discharge structure includes a dam body. A number of slope-type layered water inlets are arranged on the upstream slope surface of the dam body. A second hoist is arranged at the top of the slope-type layered water inlet. A three-way gate chamber is arranged at the bottom of the slope-type layered water inlet. The slope-type layered water inlet is communicated with the eight-shaped wall water inlet through the three-way gate chamber. A downstream control gate is arranged at the bottom of the upstream slope surface of the dam body. A buried pipe under the dam is arranged between the three-way gate chamber and the downstream control gate.

[0007] The characteristics of the present invention also lie in that:

[0008] The slope-type layered water inlets are arranged parallel to the upstream slope surface of the dam body, and a number of slope-type layered water inlets are arranged parallel to each other.

[0009] The slope-type layered water inlet includes a water inlet trough body. The cross-section of the water inlet trough body is "U"-shaped. The bottom of the water inlet trough body is attached to the slope surface on the upstream side of the dam body. A number of gates are arranged in the water inlet trough body.

[0010] A number of gates are respectively connected to the second hoist. Both sides of the gate are movably connected to the water inlet trough body through L-shaped plates. The L-shaped plates are oppositely arranged on the inner wall at the top of the water inlet trough body.

[0011] A number of trash racks are arranged at the top inside the water inlet trough body. Both sides of the trash rack are respectively connected to the L-shaped plate. A number of trash racks are arranged in parallel;

[0012] The two bottom sides of the water inlet tank body are respectively in contact with the backfilled earthwork, and the top end face of the backfilled earthwork is on the same plane as the upstream slope surface of the dam.

[0013] The three-way sluice chamber includes a bottom plate. The two ends on the upper side of the bottom plate are respectively in contact with the bottom of the inlet of the splayed wall and the bottom of the buried pipe under the dam. A breast wall is arranged at one end close to the inlet of the splayed wall on the upper side of the bottom plate. One side of the breast wall is in contact with the top of the inlet of the splayed wall, and an arc-shaped partition is arranged on the other side in contact. The two ends of the breast wall and the arc-shaped partition are respectively fixedly connected to the side walls, and the side walls are oppositely arranged at the two ends on the upper side of the bottom plate; a blocking gate is movably arranged in the breast wall, and the blocking gate is respectively connected to the first hoist and the second hoist.

[0014] The bottom plate, side walls, breast wall, and arc-shaped partition cooperate to form a sealed cavity, and the openings of the sealed cavity are respectively communicated with the slope-type stratified water inlet, the inlet of the splayed wall, and the buried pipe under the dam.

[0015] Another technical solution adopted by the present invention is a method for combining permanent and temporary use for stratified sand interception and water discharge, including the following steps:

[0016] Step 1: Select the construction area of the structure for combining permanent and temporary use for stratified sand interception and water discharge, and clean the topsoil of the construction area.

[0017] Step 2: Build a temporary diversion building structure.

[0018] Step 3: Successively build the dam body and the slope-type stratified water inlet, and install the downstream control sluice and the second hoist.

[0019] Step 4: After the dam body and the slope-type stratified water inlet are built, sand interception and water discharge are realized through the coordinated use of the inlet of the splayed wall, the three-way sluice chamber, the slope-type stratified water inlet, the buried pipe under the dam, the downstream control sluice, and the second hoist.

[0020] The characteristics of another technical solution of the present invention also lie in:

[0021] The temporary diversion building structure includes a three-way sluice chamber, an inlet of the splayed wall, and a buried pipe under the dam.

[0022] Step 2 includes the following steps: First, build the three-way sluice chamber. After the three-way sluice chamber is built, build the inlet of the splayed wall and the buried pipe under the dam. After the inlet of the splayed wall and the buried pipe under the dam are built, the construction of the temporary diversion building structure is completed.

[0023] Step 4 includes the following steps: After the dam body and the slope-type stratified water inlet are constructed, close the downstream control gate. The dam body stores the water flow, and all the gates in the slope-type stratified water inlet are opened, while the uppermost gate is closed. The slope-type stratified water inlet precipitates the sediment in the water flow. After the sediment accumulation amount in front of the closed gate in the slope-type stratified water inlet reaches the set value, close another gate below this gate, and so on until all the gates are closed. After the water quality index of the water stored by the dam body reaches the set value, open the downstream control gate to discharge clear water and lower the water level of the water stored upstream of the dam body.

[0024] The water quality indexes include sediment content, turbidity, and suspended solid concentration.

[0025] The beneficial effects of the present invention are as follows: The present invention first constructs a temporary diversion building structure, enabling normal diversion during the construction period of the permanent-temporary combined stratified sand interception and water discharge structure, and reducing the engineering construction volume. After the permanent-temporary combined stratified sand interception and water discharge structure is constructed, sediment in the water is precipitated in several slope-type stratified water inlets, and several gates are arranged at intervals in the slope-type stratified water inlet to divide it into several sections. During the sediment deposition process, the gates are closed successively from top to bottom, maximizing the sediment deposition amount of the dam body. After the water quality index of the stored water volume reaches the set value, open the downstream control gate to slowly discharge clear water. The present invention combines the method of discharging water through buried pipes under the dam and the method of segmentally depositing sediment in the slope-type stratified water inlet, effectively improving the efficiency of the sediment interception and water discharge facility in depositing sediment in the water and discharging clear water after sediment deposition. Description of the Drawings

[0026] Figure 1 is the top view of the permanent-temporary combined stratified sand interception and water discharge structure of the present invention;

[0027] Figure 2 is the cross-sectional view of the permanent-temporary combined stratified sand interception and water discharge structure of the present invention;

[0028] Figure 3 is the structural schematic diagram of the slope-type stratified water inlet in the permanent-temporary combined stratified sand interception and water discharge structure of the present invention;

[0029] Figure 4 is the structural schematic diagram of the three-way gate chamber in the permanent-temporary combined stratified sand interception and water discharge structure of the present invention;

[0030] Figure 5 is the cross-sectional view of the three-way gate chamber in the permanent-temporary combined stratified sand interception and water discharge structure of the present invention.

[0031] In the figure, 1 is the slope-type stratified water inlet; 1-1 is the water inlet tank body; 1-2 is the L-shaped plate; 1-3 is the gate; 1-4 is the trash rack; 1-5 is the backfill soil; 2 is the three-way gate chamber; 2-1 is the bottom plate; 2-2 is the side wall; 2-3 is the breast wall; 2-4 is the arc-shaped partition; 2-5 is the plugging gate; 2-6 is the first hoist; 3 is the splayed-wall water inlet; 4 is the buried pipe under the dam; 5 is the downstream control gate; 6 is the second hoist; 7 is the dam body. Specific embodiments

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] The permanent-temporary combined stratified sand interception and water discharge structure includes a dam body 7. A number of slope-type stratified water inlets 1 are arranged on the upstream slope surface of the dam body 7. A second hoist 6 is arranged at the top of the slope-type stratified water inlet 1, and a three-way gate chamber 2 is arranged at the bottom of the slope-type stratified water inlet 1. The slope-type stratified water inlet 1 is communicated with the splayed-wall water inlet 3 through the three-way gate chamber 2. A downstream control gate 5 is arranged at the bottom of the upstream slope surface of the dam body 7, and a buried pipe 4 under the dam is arranged between the three-way gate chamber 2 and the downstream control gate 5.

[0034] The slope-type stratified water inlet 1 is arranged parallel to the upstream slope surface of the dam body 7, and a number of slope-type stratified water inlets 1 are arranged in parallel.

[0035] The slope-type stratified water inlet 1 includes a water inlet tank body 1-1. The cross-section of the water inlet tank body 1-1 is in a "U" shape. The bottom of the water inlet tank body 1-1 is attached to the upstream slope surface of the dam body 7. A number of gates 1-3 are arranged in the water inlet tank body 1-1. A number of gates 1-3 are respectively connected to the second hoist 6. Both sides of the gate 1-3 are movably connected to the water inlet tank body 1-1 through L-shaped plates 1-2. The L-shaped plates 1-2 are oppositely arranged on the inner wall of the top of the water inlet tank body 1-1. A number of trash racks 1-4 are arranged on the inner top of the water inlet tank body 1-1. Both sides of the trash rack 1-4 are respectively connected to the L-shaped plates 1-2. A number of trash racks 1-4 are arranged in parallel. Both sides of the bottom of the water inlet tank body 1-1 are respectively attached to the backfill soil 1-5. The top end face of the backfill soil 1-5 is on the same plane as the upstream slope surface of the dam body 7.

[0036] The three-way gate chamber 2 includes a bottom plate 2-1. The two ends on the upper side of the bottom plate 2-1 are respectively attached to the bottom of the splayed-wall water inlet 3 and the bottom of the buried pipe 4 under the dam. A breast wall 2-3 is arranged at one end close to the splayed-wall water inlet 3 on the upper side of the bottom plate 2-1. One side of the breast wall 2-3 is attached to the top of the splayed-wall water inlet 3, and an arc-shaped partition 2-4 is attached to the other side. Both ends of the breast wall 2-3 and the arc-shaped partition 2-4 are fixedly connected to the side walls 2-2. The side walls 2-2 are oppositely arranged at both ends on the upper side of the bottom plate 2-1. A plugging gate 2-5 is movably arranged in the breast wall 2-3. The plugging gate is respectively connected to the first hoist 2-6 and the second hoist 6.

[0037] The bottom plate 2-1, side wall 2-2, breast wall 2-3, and arc-shaped partition 2-4 cooperate to form a sealed cavity, and the openings of the sealed cavity are respectively connected to the slope-type stratified water inlet 1, splayed wall water inlet 3, and buried pipe 4 under the dam.

[0038] The permanent-temporary combined stratified sand detention and water discharge method includes the following steps:

[0039] Step 1: Select the construction area of the permanent-temporary combined stratified sand detention and water discharge structure, and clean the topsoil of the construction area.

[0040] Step 2: Build a temporary diversion building structure.

[0041] The temporary diversion building structure includes a three-way gate chamber 2, splayed wall water inlet 3, and buried pipe 4 under the dam.

[0042] First, build the three-way gate chamber 2. After the three-way gate chamber 2 is completed, build the splayed wall water inlet 3 and the buried pipe 4 under the dam. After the splayed wall water inlet 3 and the buried pipe 4 under the dam are completed, the construction of the temporary diversion building structure is completed.

[0043] Step 3: Successively build the dam body 7 and the slope-type stratified water inlet 1, and install the downstream control gate 5 and the second hoist 6.

[0044] Step 4: After the dam body 7 and the slope-type stratified water inlet 1 are built, the sand detention and water discharge are realized through the cooperation of the splayed wall water inlet 3, three-way gate chamber 2, slope-type stratified water inlet 1, buried pipe 4 under the dam, downstream control gate 5, and the second hoist 6.

[0045] After the dam body 7 and the slope-type stratified water inlet 1 are built, close the downstream control gate 5. The dam body 7 stores the water flow. All the gates 1-3 in the slope-type stratified water inlet 1 are opened, and the uppermost gate 1-3 is closed. The sediment in the flowing water is precipitated in the slope-type stratified water inlet 1. After the sediment accumulation amount in front of the closed gate 1-3 in the slope-type stratified water inlet 1 reaches the set value, close another gate 1-3 below this gate 1-3, and so on until all the gates 1-3 are closed. After the water quality index of the water stored by the dam body 7 reaches the set value, open the downstream control gate 5 to discharge the clear water and lower the water level of the water stored upstream of the dam body 7.

[0046] The water quality index includes sediment concentration, turbidity, and suspended solid concentration.

[0047] Embodiment 1

[0048] This embodiment proposes a permanent-temporary combined stratified sand detention and water discharge structure, as Figure 1 and Figure 2As shown in the figure, it includes a dam body 7. A number of slope-type stratified water inlets 1 are arranged on the upstream slope surface of the dam body 7. A second hoist 6 is arranged at the top of the slope-type stratified water inlet 1. A three-way gate chamber 2 is arranged at the bottom of the slope-type stratified water inlet 1. The slope-type stratified water inlet 1 is connected to the splayed-wall water inlet 3 through the three-way gate chamber 2. A downstream control gate 5 is arranged at the bottom of the upstream slope surface of the dam body 7. A buried pipe under the dam 4 is arranged between the three-way gate chamber 2 and the downstream control gate 5.

[0049] Embodiment 2

[0050] This embodiment proposes a permanent and temporary combined stratified sand interception and water discharge structure. As Figure 1 and Figure 2 shown in the figure, it includes a dam body 7. A number of slope-type stratified water inlets 1 are arranged on the upstream slope surface of the dam body 7. A second hoist 6 is arranged at the top of the slope-type stratified water inlet 1. A three-way gate chamber 2 is arranged at the bottom of the slope-type stratified water inlet 1. The slope-type stratified water inlet 1 is connected to the splayed-wall water inlet 3 through the three-way gate chamber 2. A downstream control gate 5 is arranged at the bottom of the upstream slope surface of the dam body 7. A buried pipe under the dam 4 is arranged between the three-way gate chamber 2 and the downstream control gate 5.

[0051] The slope-type stratified water inlet 1 is arranged parallel to the upstream slope surface of the dam body 7, and a number of slope-type stratified water inlets 1 are arranged parallel to each other. Combining Figure 3 shown in the figure, the slope-type stratified water inlet 1 includes a water inlet trough body 1-1. The cross-section of the water inlet trough body 1-1 is in a "U" shape. The bottom of the water inlet trough body 1-1 is attached to the slope surface on the upstream side of the dam body 7. A number of gates 1-3 are arranged in the water inlet trough body 1-1.

[0052] Embodiment 3

[0053] This embodiment proposes a permanent and temporary combined stratified sand interception and water discharge structure. As Figure 1 and Figure 2 shown in the figure, it includes a dam body 7. A number of slope-type stratified water inlets 1 are arranged on the upstream slope surface of the dam body 7. A second hoist 6 is arranged at the top of the slope-type stratified water inlet 1. A three-way gate chamber 2 is arranged at the bottom of the slope-type stratified water inlet 1. The slope-type stratified water inlet 1 is connected to the splayed-wall water inlet 3 through the three-way gate chamber 2. A downstream control gate 5 is arranged at the bottom of the upstream slope surface of the dam body 7. A buried pipe under the dam 4 is arranged between the three-way gate chamber 2 and the downstream control gate 5.

[0054] The slope-type stratified water inlet 1 is arranged parallel to the upstream slope surface of the dam body 7, and a number of slope-type stratified water inlets 1 are arranged parallel to each other. Combining Figure 3As shown in the figure, the slope-type stratified water inlet 1 includes a water inlet tank body 1-1. The cross-section of the water inlet tank body 1-1 is in a "U" shape. The bottom of the water inlet tank body 1-1 is attached to the slope surface on the upstream side of the dam body 7. A number of gates 1-3 are arranged in the water inlet tank body 1-1. The number of gates 1-3 are respectively connected to the second hoist 6. Both sides of the gates 1-3 are movably connected to the water inlet tank body 1-1 through L-shaped plates 1-2. The L-shaped plates 1-2 are oppositely arranged on the inner wall of the top of the water inlet tank body 1-1. A number of trash racks 1-4 are arranged on the inner top of the water inlet tank body 1-1. Both sides of the trash racks 1-4 are respectively connected to the L-shaped plates 1-2. The number of trash racks 1-4 are arranged in parallel. The bottom parts on both sides of the water inlet tank body 1-1 are respectively attached to the backfill soil 1-5. The top end surface of the backfill soil 1-5 is on the same plane as the slope surface on the upstream side of the dam body 7.

[0055] Embodiment 4

[0056] This embodiment proposes a permanent and temporary combined stratified sand interception and water discharge structure. As Figure 1 and Figure 2 shown, it includes a dam body 7. A number of slope-type stratified water inlets 1 are arranged on the slope surface on the upstream side of the dam body 7. A second hoist 6 is arranged on the top of the slope-type stratified water inlet 1. A three-way gate chamber 2 is arranged at the bottom of the slope-type stratified water inlet 1. The slope-type stratified water inlet 1 is communicated with the splayed wall water inlet 3 through the three-way gate chamber 2. A downstream control gate 5 is arranged at the bottom of the slope surface on the upstream side of the dam body 7. A buried pipe 4 under the dam is arranged between the three-way gate chamber 2 and the downstream control gate 5.

[0057] The slope-type stratified water inlet 1 is arranged parallel to the slope surface on the upstream side of the dam body 7. The number of slope-type stratified water inlets 1 are arranged in parallel. Combining Figure 3 shown, the slope-type stratified water inlet 1 includes a water inlet tank body 1-1. The cross-section of the water inlet tank body 1-1 is in a "U" shape. The bottom of the water inlet tank body 1-1 is attached to the slope surface on the upstream side of the dam body 7. A number of gates 1-3 are arranged in the water inlet tank body 1-1. The number of gates 1-3 are respectively connected to the second hoist 6. Both sides of the gates 1-3 are movably connected to the water inlet tank body 1-1 through L-shaped plates 1-2. The L-shaped plates 1-2 are oppositely arranged on the inner wall of the top of the water inlet tank body 1-1. A number of trash racks 1-4 are arranged on the inner top of the water inlet tank body 1-1. Both sides of the trash racks 1-4 are respectively connected to the L-shaped plates 1-2. The number of trash racks 1-4 are arranged in parallel. The bottom parts on both sides of the water inlet tank body 1-1 are respectively attached to the backfill soil 1-5. The top end surface of the backfill soil 1-5 is on the same plane as the slope surface on the upstream side of the dam body 7.

[0058] Combining Figure 4 and Figure 5As shown in the figure, the three-way sluice chamber 2 includes a bottom plate 2-1. The two ends of the upper side of the bottom plate 2-1 are respectively in contact with the bottom of the eight-sided wall water inlet 3 and the bottom of the buried pipe 4 under the dam. A breast wall 2-3 is arranged at one end of the upper side of the bottom plate 2-1 close to the eight-sided wall water inlet 3. One side of the breast wall 2-3 is in contact with the top of the eight-sided wall water inlet 3, and an arc-shaped partition plate 2-4 is arranged on the other side in contact. The two ends of the breast wall 2-3 and the arc-shaped partition plate 2-4 are respectively fixedly connected to the side walls 2-2. The side walls 2-2 are oppositely arranged at the two ends of the upper side of the bottom plate 2-1. A blocking gate 2-5 is movably arranged in the breast wall 2-3, and the blocking gate is respectively connected to the first hoist 2-6 and the second hoist 6. The bottom plate 2-1, the side walls 2-2, the breast wall 2-3, and the arc-shaped partition plate 2-4 cooperate to form a sealed cavity, and the openings of the sealed cavity are respectively communicated with the slope-type stratified water inlet 1, the eight-sided wall water inlet 3, and the buried pipe 4 under the dam.

[0059] Example 5

[0060] This embodiment proposes a method for combining permanent and temporary use for stratified sand interception and water discharge, including the following steps:

[0061] Step 1: Select the construction area of the structure for combining permanent and temporary use for stratified sand interception and water discharge, and clean the topsoil of the construction area;

[0062] Step 2: Build a temporary diversion building structure;

[0063] Step 3: Build the dam body 7 and the slope-type stratified water inlet 1 in sequence, and install the downstream control gate 5 and the second hoist 6;

[0064] Step 4: After the dam body 7 and the slope-type stratified water inlet 1 are built, use the cooperation of the eight-sided wall water inlet 3, the three-way sluice chamber 2, the slope-type stratified water inlet 1, the buried pipe 4 under the dam, the downstream control gate 5, and the second hoist 6 to achieve sand interception and water discharge.

[0065] Example 6

[0066] This embodiment proposes a method for combining permanent and temporary use for stratified sand interception and water discharge, including the following steps:

[0067] Step 1: Select the construction area of the structure for combining permanent and temporary use for stratified sand interception and water discharge, and clean the topsoil of the construction area;

[0068] Step 2: Build a temporary diversion building structure;

[0069] The temporary diversion building structure includes the three-way sluice chamber 2, the eight-sided wall water inlet 3, and the buried pipe 4 under the dam;

[0070] First, build the three-way sluice chamber 2. After the three-way sluice chamber 2 is built, build the eight-sided wall water inlet 3 and the buried pipe 4 under the dam. After the eight-sided wall water inlet 3 and the buried pipe 4 under the dam are built, the construction of the temporary diversion building structure is completed;

[0071] Step 3: Successively construct the dam body 7 and the slope-type stratified water inlet 1, and install the downstream control sluice 5 and the second hoist 6;

[0072] Step 4: After the dam body 7 and the slope-type stratified water inlet 1 are constructed, sand interception and water discharge are achieved through the coordinated use of the splayed wall water inlet 3, the three-way sluice chamber 2, the slope-type stratified water inlet 1, the buried pipe under the dam 4, the downstream control sluice 5 and the second hoist 6;

[0073] After the dam body 7 and the slope-type stratified water inlet 1 are constructed, close the downstream control sluice 5. The dam body 7 stores the water flow. All the gates 1-3 in the slope-type stratified water inlet 1 are opened, and the uppermost gate 1-3 is closed. The sand in the flowing water is precipitated in the slope-type stratified water inlet 1. After the sediment accumulation amount in front of the closed gate 1-3 in the slope-type stratified water inlet 1 reaches the set value, close another gate 1-3 below this gate 1-3, and so on until all the gates 1-3 are closed; after the water quality index of the water flow stored by the dam body 7 reaches the set value, open the downstream control sluice 5 to discharge clear water and lower the water level of the water flow stored upstream of the dam body 7;

[0074] The water quality index includes sediment content, turbidity, and suspended solid concentration.

[0075] In the embodiment of the present invention, the slope-type stratified water inlet 1 is located on the upstream slope of the dam body 7 and is arranged perpendicular to the dam axis, mainly providing a sand-blocking function during the operation period; the water inlet tank body 1-1 is the main load-bearing and water-passing building. Anti-slip platforms are arranged on the bottom plate in the water inlet tank body 1-1 at intervals of 5m to 10m. There are notches at the top of the side wall of the water inlet tank body 1-1. It adopts a reinforced concrete structure, and the concrete strength grade is not lower than C30; the L-shaped plate 1-2 is arranged in the notch of the side wall of the water inlet tank body 1-1 and is connected to the tank body by means of embedded steel bars welding. Its main function is to prevent stress concentration from damaging the tank body and at the same time reduce the friction force when the gate 1-3 is opened and closed; the gate 1-3 is arranged above the L-shaped plate 1-2. As the reservoir sedimentation amount increases, the gates 1-3 are lowered one by one to block sand. The thickness of the gate is not less than 30cm, the width is not greater than the net width of the water inlet tank body 1-1 and not less than 30cm, and it adopts a reinforced concrete structure, and the concrete strength grade is not lower than C30; the trash rack 1-4 is arranged at the top of the side wall of the water inlet tank body 1-1 and also above the gate 1-3, with a gap of not less than 5cm between them, mainly preventing dead branches and fallen leaves in the reservoir area from entering the water inlet and blocking the operation of the structure. It is mainly composed of circular stainless steel pipes and is connected to the water inlet tank body 1-1 by means of embedded steel bars welding; the backfill soil 1-5 is to backfill the excavated tank bodies formed on both sides during the construction of the water inlet tank body 1-1 with the original soil, and its function is to keep the dam body smooth.

[0076] The three-way sluice chamber 2 is arranged at the toe of the slope on the upstream side of the dam body 7, and its structure is in the form of a three-way pipe; the bottom slab 2-1 is arranged at the bottom of the overall structure of the three-way sluice chamber 2, which is a rectangular plate structure and is constructed with reinforced concrete. The concrete strength grade is not lower than C30. The elevation of the bottom slab 2-1 is 30 cm to 50 cm lower than the bottom slabs of the splayed wall water inlet 3 and the buried pipe 4 under the dam, forming a water cushion, which plays a certain energy dissipation role in the initial stage of the operation period to protect the bottom slab 2-1; the side walls 2-2 are symmetrically arranged on both sides above the bottom slab 2-1 and are integrally cast-in-place with the bottom slab 2-1, and are made of reinforced concrete structure. The concrete strength grade is not lower than C30; the breast wall 2-3 is arranged above the upstream side inside the side wall 2-2, and its main function is to block water and at the same time provide support for the plugging gate 2-5. It is made of reinforced concrete structure, and the concrete strength grade is not lower than C30; the arc-shaped partition plate 2-4 is arranged above the downstream side inside the side wall 2-2 to guide the water flow at the water inlet. It is made of reinforced concrete structure, and the concrete strength grade is not lower than C30; the plugging gate 2-5 is arranged upstream of the three-way sluice chamber 2 and can be selected to be closed and plugged after the main project construction is completed. It is made of reinforced concrete structure, and the concrete strength grade is not lower than C30; the first hoist 2-6 provides power for the plugging gate 2-5 to slowly close the gate and prevent the structure from being damaged.

[0077] The splayed wall water inlet 3 is arranged upstream of the three-way sluice chamber 2, and its main function is to guide the water flow into the buried pipe 4 under the dam. It is made of reinforced concrete structure, and the concrete strength grade is not lower than C25; the buried pipe 4 under the dam is arranged downstream of the three-way sluice chamber 2, and its main functions are diversion during the construction period and water discharge during the operation period. Its external shape is trapezoidal, and the trapezoid is mainly for facilitating the compaction of the dam backfill. It is made of reinforced concrete structure, and the concrete strength grade is not lower than C30; the downstream control gate 5 is arranged at the end of the buried pipe 4 under the dam, and is mainly used to control the flow rate and water pressure, so that the whole structure discharges water under pressure, control the downstream discharge flow, and provide conditions for the sedimentation of the turbid water in the reservoir area; the second hoist 6 is arranged on the top of the slope-type stratified water inlet 1 and is fixed on the top platform to facilitate the smooth sliding of the control gate 1-3.

[0078] During the construction period of the permanent-temporary combined stratified sand interception and water discharge structure in the embodiment of the present invention, the temporary diversion building structure conducts normal diversion. After the construction period is completed, the plugging gate 2-5 can be selected to be lowered; during the operation period after the permanent-temporary combined stratified sand interception and water discharge structure is built, before the flood comes, the downstream control gate 5 is closed, and the permanent-temporary combined stratified sand interception and water discharge structure intercepts floods and sand, and sediments for two to three days, increasing the sedimentation in front of the dam. Subsequently, the downstream control gate 5 is slowly opened to discharge clear water, and the reservoir water level drops; when the elevation of the sedimentation in front of the dam reaches less than 1 m from the top of another gate 1-3 below, the adjacent gate 1-3 below is closed, and so on until all the gates 1-3 are lowered, and the sand interception dam reaches the designed capacity, and then it is processed according to the relevant specification requirements in the later stage.

[0079] The present invention adopts a permanent-temporary combined layered sand interception and water discharge structure, cancels the construction of a water discharge tower, solves the problem of sharing a water discharge pipe during construction period diversion and water discharge during operation period, reduces the construction period, and lowers the project investment.

Claims

1. The permanent-temporary combined layered sand interception and water drainage structure is characterized in that It includes a dam body (7). A number of slope - type layered water inlets (1) are arranged on the upstream slope surface of the dam body (7). A second hoist (6) is arranged at the top of the slope - type layered water inlet (1). A three - way gate chamber (2) is arranged at the bottom of the slope - type layered water inlet (1). The slope - type layered water inlet (1) is connected to a splayed - wall water inlet (3) through the three - way gate chamber (2). A downstream control gate (5) is arranged at the bottom of the upstream slope surface of the dam body (7). A buried pipe under the dam (4) is arranged between the three - way gate chamber (2) and the downstream control gate (5); The slope - type layered water inlet (1) includes a water inlet trough body (1 - 1). The cross - section of the water inlet trough body (1 - 1) is in a "U" shape. The bottom of the water inlet trough body (1 - 1) is fitted with the upstream slope surface of the dam body (7). A number of gates (1 - 3) are arranged in the water inlet trough body (1 - 1).

2. The permanent and temporary combined layered sand interception and water drainage structure according to claim 1, wherein The slope - type layered water inlet (1) is arranged parallel to the upstream slope surface of the dam body (7). A number of the slope - type layered water inlets (1) are arranged parallel to each other.

3. The permanent-temporary combined layered sand interception and water drainage structure according to claim 1, characterized in that, A number of the gates (1 - 3) are respectively connected to the second hoist (6). Both sides of the gate (1 - 3) are movably connected to the water inlet trough body (1 - 1) through L - shaped plates (1 - 2). The L - shaped plates (1 - 2) are oppositely arranged on the inner wall of the top of the water inlet trough body (1 - 1).

4. The permanent-temporary combined layered sand interception and water drainage structure according to claim 3, characterized in that, A number of trash racks (1 - 4) are arranged at the inner top of the water inlet trough body (1 - 1). Both sides of the trash rack (1 - 4) are respectively connected to the L - shaped plate (1 - 2). A number of the trash racks (1 - 4) are arranged in parallel; Both bottom sides of the water inlet trough body (1 - 1) are respectively fitted with backfilled earthwork (1 - 5). The top end face of the backfilled earthwork (1 - 5) is on the same plane as the upstream slope surface of the dam body (7).

5. The permanent and temporary combined layered sand-blocking and water-draining structure according to claim 4 is characterized in that: The three - way gate chamber (2) includes a bottom plate (2 - 1). Both ends on the upper side of the bottom plate (2 - 1) are respectively fitted with the bottom of the splayed - wall water inlet (3) and the bottom of the buried pipe under the dam (4). A breast wall (2 - 3) is arranged at one end of the upper side of the bottom plate (2 - 1) close to the splayed - wall water inlet (3). One side of the breast wall (2 - 3) is fitted with the top of the splayed - wall water inlet (3), and an arc - shaped partition plate (2 - 4) is fitted on the other side. Both ends of the breast wall (2 - 3) and the arc - shaped partition plate (2 - 4) are fixedly connected to the side walls (2 - 2). The side walls (2 - 2) are oppositely arranged at both ends on the upper side of the bottom plate (2 - 1); A blocking gate (2 - 5) is movably arranged in the breast wall (2 - 3). The blocking gate is respectively connected to the first hoist (2 - 6) and the second hoist (6).

6. The permanent and temporary combined layered sand interception and water drainage structure according to claim 5, wherein, The bottom plate (2 - 1), the side walls (2 - 2), the breast wall (2 - 3), and the arc - shaped partition plate (2 - 4) cooperate to form a sealed cavity. The openings of the sealed cavity are respectively connected to the slope - type layered water inlet (1), the splayed - wall water inlet (3), and the buried pipe under the dam (4).

7. Method for combining permanent and temporary structures for layered sand interception and water drainage, characterized in that, Based on the permanent - and - temporary - combined layered sand - retaining and water - discharging structure described in claim 3, it includes the following steps: Step 1: Select the construction area of the permanent - and - temporary - combined layered sand - retaining and water - discharging structure, and clean the topsoil of the construction area; Step 2: Build a temporary diversion building structure; Step 3: Construct the dam body (7) and the slope-type stratified water inlet (1) in sequence, and install the downstream control sluice (5) and the second hoist (6). Step 4: After the construction of the dam body (7) and the slope-type stratified water inlet (1) is completed, sand interception and water discharge are achieved through the coordinated use of the splayed-wall water inlet (3), the three-way lock chamber (2), the slope-type stratified water inlet (1), the buried pipe under the dam (4), the downstream control sluice (5) and the second hoist (6).

8. The permanent-temporary combined layered sand trapping and water drainage method according to claim 7, characterized in that The temporary diversion building structure includes the three-way lock chamber (2), the splayed-wall water inlet (3), and the buried pipe under the dam (4). Step 2 includes the following steps: First, construct the three-way lock chamber (2). After the construction of the three-way lock chamber (2) is completed, construct the splayed-wall water inlet (3) and the buried pipe under the dam (4). After the construction of the splayed-wall water inlet (3) and the buried pipe under the dam (4) is completed, the construction of the temporary diversion building structure is completed.

9. The permanent-temporary combined layered sand interception and water drainage method according to claim 7, wherein, Step 4 includes the following steps: After the construction of the dam body (7) and the slope-type stratified water inlet (1) is completed, close the downstream control sluice (5). The dam body (7) stores the water flow. All the gates (1-3) in the slope-type stratified water inlet (1) are opened, and the uppermost gate (1-3) is closed. The sediment in the flowing water is precipitated in the slope-type stratified water inlet (1). After the sediment accumulation amount in front of the closed gate (1-3) in the slope-type stratified water inlet (1) reaches the set value, close the other gate (1-3) below this gate (1-3), and so on until all the gates (1-3) are closed. After the water quality index of the water flow stored by the dam body (7) reaches the set value, open the downstream control sluice (5) to discharge the clear water and reduce the water level of the water flow stored upstream of the dam body (7). The water quality index includes sediment content, turbidity, and suspended solid concentration.

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