Water inlet and outlet structure of reservoir basin

Abstract

The invention relates to the field of water conservancy and hydropower engineering construction, in particular to a reservoir basin water inlet and outlet structure achieving compact arrangement between a side type water inlet and outlet and a backfill concrete layer, the reservoir basin water inlet and outlet structure comprises a reservoir basin and the side type water inlet and outlet, a digging and filling boundary is arranged in the reservoir basin, and the backfill concrete layer is arranged on one side of the digging and filling boundary; the reservoir basin comprises a reservoir basin asphalt concrete panel, the backfill concrete layer is arranged below the reservoir basin asphalt concrete panel, a backfill concrete layer impermeable layer is arranged on the surface of the backfill concrete layer, and the side water inlet and outlet is formed in the backfill concrete layer so that the interior of the reservoir basin can be communicated with the outside. The construction method is particularly suitable for construction of the water inlet and outlet of the reservoir basin.

Description

Technical Field

[0001] The present invention relates to the field of water conservancy and hydropower engineering construction, and particularly to a structure of the inlet and outlet of a reservoir basin. Background Art

[0002] A reservoir basin is an artificial reservoir structure for storing water energy in a pumped-storage power station, and is the core facility for the power station to achieve energy storage and conversion. Among them, the reservoir basin can store water energy, store water during the low electricity consumption period, and generate electricity during the peak period, so as to realize peak shaving and valley filling of the power grid. It can also rely on the transformation of natural terrain, such as valleys and basins, for artificial excavation and construction, reducing the dependence on natural water sources, and is particularly suitable for areas without natural rivers but with a terrain difference.

[0003] Among them, taking a pumped-storage power station as an example, there is usually no natural inflow of water in the upper reservoir of the pumped-storage power station, and the reservoir has poor sealing conditions. The asphalt concrete facing has excellent anti-seepage performance and anti-seepage reliability, is convenient for construction, has a high level of mechanization, and has good operation and maintenance conditions, so it is often favored and applied to the anti-seepage structure of the reservoir basin or the semi-reservoir basin surface. The side-type inlet and outlet is generally built on the shore, which is convenient for connecting with the reservoir bank, and the layout of transportation and gates is relatively convenient. The flow direction of the water flow in the inlet and outlet section changes little, the flow velocity distribution during outflow is relatively easy to be adjusted evenly, the head loss is generally small, the hydraulic conditions are simple, and the construction of the water conveyance channel is convenient. At present, the inlet and outlet of domestic pumped-storage power stations, especially large pumped-storage power stations, mostly adopt the side type.

[0004] In engineering practice, the anti-seepage bottom of the full reservoir basin or semi-reservoir basin is divided by the excavation and filling demarcation line. On one side of the excavation and filling demarcation line, stone slag is required for backfilling to obtain a backfilled concrete layer, which can reduce engineering waste slag, do not set up a slag yard separately, thereby reducing the impact on the ecological environment. At the same time, it can also reduce the anti-seepage area, reduce the leakage risk, facilitate maintenance, and save the project cost. However, after the above-mentioned backfilled concrete layer is completed, the existence of the backfilled concrete layer will affect the layout positions of the asphalt concrete facing of the reservoir basin and the inlet and outlet, and sometimes even make it difficult to arrange the inlet and outlet. Secondly, the anti-seepage types between the backfilled concrete layers are different. If the relevant layout connection types and construction methods are not properly solved, it will seriously restrict the combination of this engineering layout, and even pose potential hazards to the safety and benefits of the project. Therefore, how to handle the position layout relationship and anti-seepage treatment among the reservoir basin, the backfilled concrete layer, and the side-type inlet and outlet has become a technical problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a structure of the inlet and outlet of a reservoir basin that realizes a compact layout between the side-type inlet and outlet and the backfilled concrete layer.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a reservoir basin inlet and outlet structure, including a reservoir basin and a side inlet and outlet. The reservoir basin includes a cut-and-fill demarcation line, and one side of the cut-and-fill demarcation line is a backfilled concrete layer; the reservoir basin includes a reservoir basin asphalt concrete panel, the backfilled concrete layer is arranged below the reservoir basin asphalt concrete panel, a seepage prevention layer of the backfilled concrete layer is arranged on the surface of the backfilled concrete layer, and the side inlet and outlet is arranged in the backfilled concrete layer to connect the inside of the reservoir basin and the outside.

[0007] Further, the side inlet and outlet includes a trash rack section and an adjustment section, and the trash rack section and the adjustment section are arranged on the bedrock or the foundation of the backfilled concrete layer in the reservoir basin.

[0008] Further, the side inlet and outlet includes a diversion channel section, the diversion channel section is communicated with the trash rack section, and at least a part of the diversion channel section is arranged on the side of the cut-and-fill demarcation line facing the backfilled concrete layer.

[0009] Further, it includes an inverse slope section and side slope sections arranged on both sides of the inverse slope section, and the inverse slope section and the side slope sections are arranged on the side of the diversion channel section away from the trash rack section.

[0010] Further, asphalt concrete panel structures are arranged on the inverse slope section, the side slope sections and the diversion channel section.

[0011] Further, it includes a drainage gallery, and the drainage gallery includes a reservoir bank drainage gallery, a reservoir bottom drainage gallery, a connecting drainage gallery and an inlet and outlet bottom drainage gallery. The reservoir bank drainage gallery, the reservoir bottom drainage gallery, the connecting drainage gallery and the inlet and outlet bottom drainage gallery form a closed annular structure.

[0012] Further, the reservoir basin asphalt concrete panel includes a reservoir bank asphalt concrete panel, the backfilled concrete layer includes a reservoir bank backfilled concrete layer, the reservoir bank backfilled concrete layer is arranged below the reservoir bank asphalt concrete panel, and the reservoir bank drainage gallery is arranged in the reservoir bank backfilled concrete layer.

[0013] Further, the reservoir bank asphalt concrete panel is obliquely arranged with the horizontal plane, and the reservoir bank drainage gallery is communicated with the lowest point of the reservoir bank asphalt concrete panel through a drainage hole.

[0014] Further, the reservoir basin asphalt concrete panel includes a reservoir bottom asphalt concrete panel, the backfilled concrete layer includes a reservoir bottom backfilled concrete layer, the reservoir bottom backfilled concrete layer is arranged below the reservoir bottom asphalt concrete panel, and the inlet and outlet bottom drainage gallery is arranged in the reservoir bottom backfilled concrete layer.

[0015] Further, the slope ratio of the reservoir bank asphalt concrete panel is 1:1.7.

[0016] The beneficial effects of the present invention are as follows: First, for the backfill concrete layer provided in the reservoir basin and the layout requirements of the side-type inlet and outlet, in this solution, the side-type inlet and outlet is arranged within the backfill concrete layer, thus eliminating the influence of the existence of the backfill concrete layer on the layout of the side-type inlet and outlet, making the layout relationship between the backfill concrete layer and the side-type inlet and outlet in the reservoir basin more compact. This layout solution can also be applied to some reservoir basins with relatively small volumes. Second, after arranging the side-type inlet and outlet within the backfill concrete layer, the parts with different anti-seepage types and different anti-seepage requirements, such as the reservoir basin and the backfill concrete layer, are optimized accordingly, enabling the asphalt concrete panel of the reservoir basin and the anti-seepage layer of the backfill concrete layer to play their respective anti-seepage effects and ensuring the anti-seepage requirements of the facilities. Third, by providing a closed annular drainage corridor to collect and drain the seeping water flow, it collaborates with the aforementioned anti-seepage measures to achieve a better overall anti-seepage effect. Fourth, in the case of limited layout conditions, it is allowed that at least a part of the diversion channel section is arranged on the side of the excavation and filling demarcation line facing the backfill concrete layer, that is, it is allowed that the diversion channel section straddles the excavation and filling demarcation line. Thus, without affecting the layout of the side-type inlet and outlet, the side-type inlet and outlet can be compactly arranged in the reservoir basin, further enhancing the layout of the side-type inlet and outlet in the small reservoir basin scenario and thus meeting the layout requirements in the small reservoir basin scenario. The present invention is particularly applicable to the construction of the inlet and outlet of the reservoir basin. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the reservoir basin, side-type inlet and outlet, and drainage corridor of the present invention.

[0018] Figure 2 is a schematic diagram of the diversion channel section, trash rack section, adjustment section, diffusion section, and connection tunnel section of the side-type inlet and outlet of the present invention.

[0019] Figure 3 is a schematic diagram of a closed annular structure formed by the reservoir bank drainage corridor, reservoir bottom drainage corridor, connecting drainage corridor, and bottom drainage corridor of the inlet and outlet.

[0020] Figure 4 is Figure 1 the sectional view taken along A-A in

[0021] Figure 5 is Figure 1 the sectional view taken along B-B in

[0022] Figure 6 is Figure 5 the enlarged view in the direction A of

[0023] The markings in the figure are: the reservoir bank asphalt concrete panel 11, the reservoir bottom asphalt concrete panel 12, the reservoir dam 13, the excavation and filling demarcation line 14, the trash rack maintenance passage 15, the side-type water inlet and outlet 2, the diversion canal section 21, the trash rack section 22, the adjustment section 23, the adjustment section 24, the connection tunnel section 25, the gate shaft section 26, the reverse slope section 27, the side slope section 28, the side slope section of the trash rack section 29, the drainage gallery 3, the reservoir bank drainage gallery 31, the reservoir bottom drainage gallery 32, the connecting drainage gallery 33, the bottom drainage gallery of the water inlet and outlet 34, the copper sheet water stop 341, the reservoir bank backfill concrete layer 41, the reservoir bottom backfill concrete layer 42, the drainage holes 8, and the anti-seepage lap zone 321. Detailed implementation manners

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] As Figures 1 to 6 shown is an embodiment of the water inlet and outlet structure of the reservoir basin. Figure 1 In this, the outer periphery of the reservoir basin is the reservoir dam 13. The reservoir dam 13 is an overall closed ring, and the area inside the reservoir dam 13 is the area of the reservoir basin for storing water. In the area of the reservoir basin close to the reservoir dam 13, the reservoir bank asphalt concrete panel 11 is provided. In the area of the reservoir basin close to the bottom of the center of the reservoir basin, the reservoir bottom asphalt concrete panel 12 is provided. Due to construction needs in the reservoir basin, there will be an excavation and filling demarcation line 14. Among them, Figure 1 for the right part area of the excavation and filling demarcation line 14, it is the backfill concrete layer. Correspondingly, as Figure 4 shown, the area of the backfill concrete layer close to the reservoir dam 13 is the reservoir bank backfill concrete layer 41, and the area of the backfill concrete layer close to the area of the reservoir basin close to the bottom of the center of the reservoir basin is the reservoir bottom backfill concrete layer 42. Among them, the reservoir bank asphalt concrete panel 11 and the reservoir bottom asphalt concrete panel 12 are located above the backfill concrete layer. The reservoir bank asphalt concrete panel 11 and the reservoir bottom asphalt concrete panel 12 can be successively subdivided into an asphalt mastic sealing layer, an asphalt concrete anti-seepage layer, and an asphalt concrete leveling and bonding layer from the surface layer.

[0026] As Figures 1 to 4 shown, the side-type water inlet and outlet 2 successively includes a diversion canal section 21, a trash rack section 22, an adjustment section 23, an adjustment section 24, a connection tunnel section 25, and a gate shaft section 26. The side-type water inlet and outlet 2 is a reinforced concrete structure. As Figure 2As shown in the figure, most of the diversion canal section 21 is arranged in the backfill concrete layer on the right side of the excavation and filling demarcation line 14, and the remaining trash rack section 22, adjustment section 23, adjustment section 24, connection tunnel section 25 and gate shaft section 26 are all located on the right side of the excavation and filling demarcation line 14. For the situation where the diversion canal section 21 partially crosses the excavation and filling demarcation line 14, the diversion canal section 21 can adopt a flexible asphalt concrete structure. The tall concrete buildings such as the trash rack section 22 and the adjustment section 23 are arranged on the bedrock or the foundation of the backfill concrete layer. The reinforced concrete lapping position between the reservoir bank asphalt concrete panel 11 and the reservoir bottom asphalt concrete panel 12 and the side-type water inlet and outlet 2 is arranged on the top of the drainage gallery 3. The trash rack maintenance passage 15 is arranged above the trash rack section 22, the adjustment section 23 and the adjustment section 24.

[0027] As Figures 1 to 4 shown, the drainage gallery 3 includes a reservoir bank drainage gallery 31, a reservoir bottom drainage gallery 32, a connection drainage gallery 33 and a water inlet and outlet bottom drainage gallery 34. The reservoir bank drainage gallery 31, the reservoir bottom drainage gallery 32, the connection drainage gallery 33 and the water inlet and outlet bottom drainage gallery 34 form a closed annular structure. The reservoir bank drainage gallery 31 is arranged in the reservoir bank backfill concrete layer 41, and the water inlet and outlet bottom drainage gallery 34 is arranged in the reservoir bottom backfill concrete layer 42. The reservoir bottom drainage gallery 32 is respectively arranged on both sides of the reservoir bank drainage gallery 31, and the connection drainage gallery 33 is respectively arranged on the water inlet and outlet bottom drainage gallery 34. The reservoir bottom drainage gallery 32 and the connection drainage gallery 33 on the same side are connected. By making the main concrete structure of the side-type water inlet and outlet 2 all located on the hard rock foundation, the drainage gallery 3 crosses the excavation and filling demarcation line 14 at the bottom of the reservoir basin, and the lapping of different anti-seepage types occurs at the top of the gallery system to ensure the reliability and safety of the key lapping.

[0028] The specific composition of the bank asphalt concrete panel 11 and the bottom asphalt concrete panel 12 can be successively subdivided from top to bottom into an asphalt mastic sealing layer, an asphalt concrete anti-seepage layer, an asphalt concrete leveling and bonding layer, and cushion materials. After the concrete structure pouring construction below the maintenance passage 15 of the intake and outlet trash racks is completed, in order to facilitate the construction of the cushion materials and the bank asphalt concrete, the missing terrain of the bank is backfilled with concrete to a slope ratio of 1:1.7. A bank drainage gallery 31 is pre-buried in the bank backfill concrete. The bank drainage gallery 31 is of a precast flat-top shape to ensure the lap of the bank asphalt concrete and the layout of its asphalt sand wedge bodies. A bank backfill concrete layer 41 is provided below the bank asphalt concrete panel 11. To ensure the smooth construction of the intake and outlet chamber section and avoid cross-interference, the natural slope is preferably excavated at a slope ratio of 1:0.5. The bank backfill concrete layer 41 and the bottom backfill concrete layer 42 can be successively subdivided from top to bottom into an asphalt mastic sealing layer, an asphalt concrete anti-seepage layer, a polyester grid, an asphalt concrete thickening layer, an asphalt sand wedge body, an asphalt concrete leveling and bonding layer, and cushion materials. The bank drainage gallery 31 is connected to the lowest point of the bank asphalt concrete panel 11 through a drainage hole 8 to achieve the corresponding drainage effect. As Figure 2 shown, the reverse slope section 27 and the side slope section 28 are arranged on the side of the diversion channel section 21 far from the trash rack section 22. The slope ratios of the asphalt concrete panels of the reverse slope section 27 and the side slope section 28 are the same as those of the reinforced concrete panels of the side slopes of the trash rack section.

[0029] Construction method for the inlet / outlet structure of the reservoir basin, including the following steps: S1. According to the designed contour of the excavation structure, complete the excavation of the reservoir basin and the reserved inlet / outlet on the reservoir basin; S2. According to the overall structure design, complete the concrete structure pouring of the part below the trash rack maintenance passage 15 of the side inlet / outlet 2, and embed the copper sheet water stop 341; S3. Prefabricate the reservoir bank drainage gallery 31; S4. According to the reservoir bank anti-seepage design, successively complete the construction of the reservoir bank backfill concrete layer 41, the reservoir bank drainage gallery 31 and the drainage holes 8, and complete the filling of the reservoir bank bedding material, the asphalt concrete leveling and bonding layer, the triangular asphalt wedge, the polyester grid, the asphalt concrete thickening layer and the asphalt concrete anti-seepage layer pouring or laying; S5. According to the overall structure design, complete the concrete structure pouring of the part above the trash rack maintenance passage of the inlet / outlet; S6. According to the layout axis of the remaining drainage galleries, complete the excavation of the rock trench of the reservoir bottom drainage gallery 32, the connecting drainage gallery 33 and the bottom drainage gallery 34 of the inlet / outlet; S7. Reservoir bottom foundation treatment, that is, use the reservoir bottom backfill concrete layer 42 for the missing part of the terrain; S8. Complete the pouring of the reservoir bottom drainage gallery 32, the connecting drainage gallery 33 and the bottom drainage gallery 34 of the inlet / outlet, and embed the copper sheet water stop and the drain pipe; S9. Reservoir bottom stone filling, the filling area is filled with backfill slag, transition material and bedding material from bottom to top, the excavation area is filled with bedding material, and the area near the drainage gallery 3 is assisted by a rolling machine and manually rolled; S10. Pour the reinforced concrete panels of the side slopes of the trash rack section and the adjustment section of the inlet / outlet; S11. Grind the overlapping parts of the asphalt concrete and the reinforced concrete, and arrange the plastic water stop, and coat the contact surface with emulsified asphalt at 0.2 kg / m 2 , and use plastic filler at the end of the overlapping part; S12. Complete the pouring or laying of the asphalt concrete leveling and bonding layer, the triangular asphalt wedge, the polyester grid, the asphalt concrete thickening layer and the asphalt concrete anti-seepage layer on the reservoir bottom; S13. Coat the asphalt mastic sealing layer on the water-facing side.

Claims

1. A water inlet and outlet structure of a reservoir basin, comprising a reservoir basin and a side water inlet and outlet (2), wherein the reservoir basin includes a cut-and-fill boundary line (14), and one side of the cut-and-fill boundary line (14) is a backfill concrete layer; characterized in that: The reservoir basin comprises an asphalt concrete panel of the reservoir basin, a backfill concrete layer is arranged below the asphalt concrete panel of the reservoir basin, a backfill concrete layer anti-seepage layer is arranged on the surface of the backfill concrete layer, and a side water inlet and outlet (2) is arranged in the backfill concrete layer to connect the interior of the reservoir basin with the outside.

2. The water inlet and outlet structure of the basin according to claim 1, characterized in that: The side water inlet and outlet (2) comprises a trash rack section (22) and an adjustment section (23), wherein the trash rack section (22) and the adjustment section (23) are arranged on the bedrock or backfill concrete layer in the reservoir basin.

3. The water inlet and outlet structure of the basin according to claim 2, characterized in that: The side water inlet and outlet (2) comprises a channel section (21), the channel section (21) is connected to the trash rack section (22), and at least a part of the channel section (21) is arranged on the side of the cut-and-fill boundary line (14) facing the backfill concrete layer.

4. The water inlet and outlet structure of the basin according to claim 3, characterized in that: It comprises a reverse slope section (27) and side slope sections (28) arranged on both sides of the reverse slope section (27); the reverse slope section (27) and the side slope section (28) are arranged on the side of the diversion channel section (21) away from the trash rack section (22).

5. The water inlet and outlet structure of the basin according to claim 4, characterized in that: The reverse slope section (27), the side slope section (28) and the diversion channel section (21) are all provided with asphalt concrete panel structures.

6. The water inlet and outlet structure of the basin according to any one of claims 1 to 5, characterized in that: The invention comprises a drainage gallery (3), wherein the drainage gallery (3) comprises a reservoir bank drainage gallery (31), a reservoir bottom drainage gallery (32), a connecting drainage gallery (33) and an inlet and outlet bottom drainage gallery (34), wherein the reservoir bank drainage gallery (31), the reservoir bottom drainage gallery (32), the connecting drainage gallery (33) and the inlet and outlet bottom drainage gallery (34) form a closed annular structure.

7. The water inlet and outlet structure of the basin according to claim 6, characterized in that: The reservoir basin asphalt concrete panel comprises a reservoir bank asphalt concrete panel (11), the backfill concrete layer comprises a reservoir bank backfill concrete layer (41), the reservoir bank backfill concrete layer (41) is arranged below the reservoir bank asphalt concrete panel (11), and the reservoir bank drainage gallery (31) is arranged in the reservoir bank backfill concrete layer (41).

8. The water inlet and outlet structure of the basin according to claim 7, characterized in that: The reservoir bank asphalt concrete panel (11) is arranged obliquely to the horizontal plane, and the reservoir bank drainage gallery (31) is connected to the lowest point of the reservoir bank asphalt concrete panel (11) through a drainage hole (8).

9. The water inlet and outlet structure of the basin according to claim 6, characterized in that: The reservoir basin asphalt concrete panel comprises a reservoir bottom asphalt concrete panel (12), the backfill concrete layer comprises a reservoir bottom backfill concrete layer (42), the reservoir bottom backfill concrete layer (42) is arranged below the reservoir bottom asphalt concrete panel (12), and the drainage gallery (34) at the bottom of the water inlet and outlet is arranged in the reservoir bottom backfill concrete layer (42).

10. The water inlet and outlet structure of the basin according to claim 6, characterized in that: The slope ratio of the reservoir bank asphalt concrete panel (11) is 1:1.7.

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