Integral structure of vertical shaft flood discharge tunnel and blow-off pipe bulkhead gate shaft of pumped storage power station

Abstract

The invention provides a pumped storage power station vertical shaft spillway tunnel and blow-off pipe bulkhead gate shaft integral structure, which belongs to the technical field of water conservancy and hydropower engineering, and comprises a diversion tunnel, a blow-off pipe, a blow-off pipe bulkhead gate shaft, a vertical shaft spillway tunnel and a recession tunnel, the blow-off pipe comprises a straight section and a turning section, and the turning section is arranged close to the vertical shaft flood discharge tunnel; the plane axis of the diversion tunnel, the plane axis of the linear section and the plane axis of the vertical shaft spillway tunnel coincide, and the diversion tunnel and the vertical shaft spillway tunnel share a water recession tunnel; the blow-off pipe bulkhead gate shaft and the vertical shaft spillway tunnel are arranged in a combined mode in the downstream direction, and the blow-off pipe bulkhead gate shaft and the vertical shaft spillway tunnel are arranged adjacently. The concrete work amount of a blow-off pipe water inlet building is reduced; the diversion tunnel can adopt a temporary water inlet tower, so that the excavation and concrete construction workload before closure is reduced, the closure construction period is shortened, the length of a traffic bridge at the top of a water inlet building can be effectively shortened, and the construction difficulty is reduced.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy and hydropower engineering technology, and more specifically, it relates to an integrated structure of a vertical shaft flood discharge tunnel and a water discharge pipe maintenance gate well of a pumped storage power station. Background Technology

[0002] During normal operation of a pumped-storage power station, the total water volume of the upper and lower reservoirs must not exceed the regulating capacity of the first reservoir. Excess water is primarily released through discharge pipes located at lower elevations within the reservoir. Therefore, discharge pipes at lower elevations are essential and frequently used spillway facilities in the lower reservoir of a pumped-storage power station, serving functions such as flood discharge, air venting, and releasing ecological flows. On the other hand, to ensure project safety and facilitate operation and management, free-flowing surface orifices without gate control are typically installed as flood discharge facilities at the upper elevation of the reservoir. To save investment and reduce surface disturbance, free-flowing surface orifices generally employ a vertical shaft spillway design combined with a diversion tunnel. In summary, the spillway structures of the lower reservoir of a pumped-storage power station typically adopt a vertical shaft spillway + internal discharge pipe layout.

[0003] To enable the opening and closing control and maintenance of the discharge pipe during operation, a dedicated inlet structure is required. In conventional layouts, the discharge pipe inlet structure is usually combined with the diversion tunnel and inlet tower, as shown in the attached diagram. Figure 1 As shown. During the construction period, the emergency maintenance gate of the discharge pipe can be used to block water for the internal tunnel renovation work; after the diversion tunnel is sealed, the intake tower and emergency maintenance gate can continue to function, and the discharge pipe can also perform its corresponding functions. This arrangement requires less reconstruction and engineering work after the gate is closed, and it also saves one diversion tunnel sealing gate, achieving a permanent and temporary combination of civil engineering and metal structure at the intake of the diversion and flood discharge structures. However, this arrangement still has the following disadvantages: (1) In order to ensure the normal opening and closing of the emergency maintenance gate during operation, the top elevation of the intake tower is generally consistent with the top elevation of the dam. At the same time, the layout of the maintenance stairwell must also be considered, resulting in a large size of the intake tower and a large amount of excavation and concrete construction work before the diversion. (2) The intake tower is generally arranged in a shore tower type. The intake tower platform crosses the inlet of the vertical shaft flood discharge tunnel and is connected to the dam top platform. The required length of the dam top traffic bridge is relatively long, and the construction of the traffic bridge on the top of the intake tower is relatively difficult. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated structure for the vertical shaft spillway tunnel and the maintenance gate well of the water discharge pipe of a pumped storage power station, so as to solve the technical problems such as the large amount of concrete work and the difficulty of construction of traffic bridges in the existing combination of water discharge pipe inlet and diversion tunnel water intake tower.

[0005] To achieve the above objectives, the present invention provides an integrated structure for a pumped storage power station's vertical shaft spillway and discharge pipe maintenance gate well, comprising: a diversion tunnel, a discharge pipe, a discharge pipe maintenance gate well, a vertical shaft spillway, and a drainage tunnel; the discharge pipe includes a straight section and a turning section, the turning section being located close to the vertical shaft spillway; the plane axis of the diversion tunnel, the plane axis of the straight section, and the plane axis of the vertical shaft spillway coincide, and the diversion tunnel and the vertical shaft spillway share the drainage tunnel; the discharge pipe maintenance gate well and the vertical shaft spillway are arranged in a combined manner along the flow direction, and the discharge pipe maintenance gate well and the vertical shaft spillway are arranged adjacent to each other.

[0006] Furthermore, the straight section includes a water inlet section, a partial water pipe body section, and a gradually extending water pipe section. The turning section connects the partial water pipe body section and the gradually extending water pipe section. The gradually extending water pipe section is buried in the bottom slab of the drainage tunnel, and the water inlet section is connected to the reservoir water.

[0007] Furthermore, the turning section includes a planar turning section and a vertical turning section that are connected to each other. One end of the planar turning section is connected to the partial drain pipe body section, and one end of the vertical turning section is connected to the gradual extension section of the drain pipe.

[0008] Furthermore, the turning angle of each turning segment is less than 45°.

[0009] Furthermore, the diversion tunnel includes a diversion tunnel inlet tower, a sealing gate, a diversion tunnel opening and closing machine room, and a permanent plug for the diversion tunnel. The inlet of the discharge pipe is buried in the diversion tunnel inlet tower and connected to the reservoir water. The permanent plug for the diversion tunnel is poured and sealed between the diversion tunnel and the maintenance gate well of the discharge pipe after the diversion is completed.

[0010] Furthermore, the water discharge pipe maintenance gate well includes a gate well opening and closing machine room and a stairwell, and the water discharge pipe maintenance gate well is a square well shaft.

[0011] Furthermore, the vertical shaft flood discharge tunnel includes an inlet annular overflow weir, a vertical shaft section, and an energy dissipation well connected sequentially from top to bottom.

[0012] Furthermore, the vertical shaft flood discharge tunnel also includes a slope section connecting the vertical shaft section and the drainage tunnel.

[0013] Compared with the prior art, the present invention has the following technical effects: The present invention discloses an integrated structure of a vertical shaft spillway and a maintenance gate shaft for a pumped storage power station. The plane axis of the diversion tunnel, the plane axis of the straight section of the discharge pipe, and the plane axis of the vertical shaft spillway coincide. The maintenance gate shaft and the vertical shaft spillway are arranged in a flow-direction combination, which reduces the amount of concrete work for the water intake structure of the discharge pipe. Furthermore, the maintenance gate shaft and the vertical shaft spillway are arranged adjacent to each other, and a temporary intake tower can be used for the diversion tunnel, which reduces the amount of excavation and concrete construction work before the diversion, shortens the diversion period, and can also effectively shorten the length of the traffic bridge on the top of the water intake structure, reducing the construction difficulty. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the structure combining a conventional water inlet pipe structure and a diversion tunnel water inlet tower, provided as background information for this invention. Figure 2 A schematic plan view of the overall structure of the vertical shaft spillway tunnel and the maintenance gate well of the water discharge pipe of a pumped storage power station provided in an embodiment of the present invention; Figure 2 The direction of the middle arrow indicates the direction of the water flow; Figure 3 This is a cross-sectional schematic diagram of the overall structure of the vertical shaft spillway tunnel and the maintenance gate well of the water discharge pipe of a pumped storage power station, provided in an embodiment of the present invention.

[0016] In the figure, the attached figures are labeled as follows: 1-Diversion tunnel, 11-Diversion tunnel intake tower, 12-Blocking gate, 13-Diversion tunnel gatehouse, 14-Diversion tunnel permanent plug; 2-Water discharge pipe, 21-Water discharge pipe inlet section, 22-Water discharge pipe body section, 221-Plane turning section, 222-Vertical turning section, 23-Water discharge pipe gradual extension section; 3-Water discharge pipe maintenance gate well, 31-Gate well gatehouse, 32-Staircase well; 4-Vertical shaft flood discharge tunnel, 41-Inlet annular overflow weir, 42-Vertical shaft section, 43-Energy dissipation well, 44-Slope section; 5-Drainage tunnel. Detailed Implementation

[0017] To make the technical problem to be solved, the technical solution, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0018] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0019] This invention provides an integrated structure for the vertical shaft spillway tunnel and the maintenance gate well of the water discharge pipe in a pumped storage power station, such as... Figure 2 , Figure 3 As shown, it includes: a diversion tunnel 1, a discharge pipe 2, a discharge pipe maintenance gate well 3, a vertical shaft flood discharge tunnel 4, and a drainage tunnel 5. The discharge pipe 2 includes a straight section and a turning section, with the turning section located close to the vertical shaft flood discharge tunnel 4; the plane axis of the diversion tunnel 1, the plane axis of the straight section of the discharge pipe 2, and the plane axis of the vertical shaft flood discharge tunnel 4 coincide, and the diversion tunnel 1 and the vertical shaft flood discharge tunnel 4 share the drainage tunnel 5; the discharge pipe maintenance gate well 3 and the vertical shaft flood discharge tunnel 4 are arranged in a combined manner along the flow direction, and the discharge pipe maintenance gate well 3 and the vertical shaft flood discharge tunnel 4 are arranged adjacent to each other.

[0020] In a conventional water inlet structure combined with a diversion tunnel and water tower, such as Figure 1 As shown, the top elevation of the water discharge pipe maintenance gate well (accident maintenance gate well) and the diversion tunnel intake tower is the same as the dam crest elevation, which makes the diversion tunnel intake tower large in size and the amount of excavation and concrete construction before the dam closure a large workload. In addition, the distance between the water discharge pipe maintenance gate well and the vertical spillway tunnel is far, and the distance between the water discharge pipe maintenance gate well and the dam crest platform is also far, which makes the length of the dam crest traffic bridge long, and the construction of the traffic bridge is a large workload and difficult.

[0021] In this embodiment, see Figure 2 , Figure 3 By combining the maintenance gate well 3 of the discharge pipe and the vertical spillway tunnel 4 in a flow-direction arrangement, and placing them adjacent to each other, the following advantages are achieved: First, it is unnecessary to set the intake tower 11 of the diversion tunnel at the same elevation as the dam crest. Only a temporary intake tower 11 needs to be set up to meet the temporary diversion function during construction. This significantly reduces the size of the intake tower 11, reduces the amount of excavation and concrete construction work before the dam closure, and shortens the closure period, thus ensuring the closure schedule is met. Second, it significantly reduces the distance between the maintenance gate well 3 of the discharge pipe and the dam crest platform, shortens the length of the traffic bridge on the top of the intake structure, reduces construction difficulty and workload, and offers the advantage of convenient construction. In addition, the vertical shaft flood discharge tunnel 4 and the water discharge pipe maintenance gate well 3 are arranged in a longitudinal (i.e., in the direction of flow) manner. The structural concrete of the vertical shaft flood discharge tunnel 4 and the water discharge pipe maintenance gate well 3 can be poured simultaneously after one excavation, which reduces the amount of concrete work for the water discharge pipe inlet structure and has the advantage of small project volume.

[0022] In this embodiment, the plane axis of the diversion tunnel 1, the plane axis of the discharge pipe 2 (except for the horizontal turning section), and the plane axis of the vertical shaft flood discharge tunnel 4 coincide. Furthermore, the plane axis of the diversion tunnel 1 also coincides with the plane axis of the drainage tunnel 5. This simple structural arrangement not only shortens the installation period of the discharge pipe 2 in the permanent plug and the construction period of the structural concrete reconstruction after the diversion tunnel 1 is closed, but also makes the flood discharge flow smoother during operation and simplifies related hydraulic issues.

[0023] In one embodiment, the straight section of the discharge pipe 2 includes a discharge pipe inlet section 21, a portion of the discharge pipe body section 22, and a gradually extending discharge pipe section 23. The turning section of the discharge pipe 2 connects the portion of the discharge pipe body section 22 and the gradually extending discharge pipe section 23. The gradually extending discharge pipe section 23 is buried in the bottom slab of the drainage tunnel 5, and the discharge pipe inlet section 21 is connected to the reservoir water. The turning section of the discharge pipe 2 is part of the discharge pipe body section 22. By setting a section of the discharge pipe 2 near the vertical shaft flood discharge tunnel 4 as a turning section, the vertical shaft flood discharge tunnel 4 can be avoided.

[0024] In one embodiment, the bend in the drain pipe 2 includes an interconnected planar bend section 221 and a vertical bend section 222. One end of the planar bend section 221 communicates with a portion of the drain pipe body 22, and one end of the vertical bend section 222 communicates with a gradually elongated drain pipe section 23. See also Figure 2 In this embodiment, two planar turning segments 221 are provided; see also Figure 3 One vertical turning section 222 is provided. By setting a planar turning section 221, the water discharge pipe 2 avoids the vertical shaft flood discharge tunnel 4 in the horizontal plane. The vertical turning section 222 is used to connect the water discharge pipe slow-length section 23 and the planar turning section 221 at different elevations.

[0025] In one embodiment, the turning angle of the bend is less than 45°, which makes the water flow smoother and reduces the vibration of the drain pipe 2.

[0026] In one embodiment, the diversion tunnel 1 includes a diversion tunnel inlet tower 11, a sealing gate 12, a diversion tunnel gate operating room 13, and a permanent plug 14. The inlet of the discharge pipe 2 is buried inside the diversion tunnel inlet tower 11 and connected to the reservoir water. The permanent plug 14 is poured and sealed between the diversion tunnel 1 and the discharge pipe maintenance gate well 3 after the diversion is completed. See also Figure 2 , Figure 3In this embodiment, the discharge pipe 2 consists of a discharge pipe inlet section 21, a discharge pipe body section 22, and a gradually extending discharge pipe section 23. The turning section is part of the discharge pipe body section 22. The discharge pipe inlet section 21 is buried inside the diversion tunnel intake tower 11 on the backwater side of the sealing gate 12 and is connected to the reservoir water. In this embodiment, the diversion tunnel intake tower 11 is a temporary structure that is put into use during the construction period. After the construction is completed, the water flow is blocked by lowering the sealing gate 12 through the diversion tunnel opening and closing machine room 13 at the top of the tower, and a permanent plug 14 is poured to seal it to prevent water leakage from the reservoir.

[0027] In one embodiment, the water discharge pipe 2 is provided with a water discharge pipe maintenance gate well 3. The water discharge pipe maintenance gate well 3 includes a gate well opening and closing machine room 31 located at the top and a stairwell 32 located inside. The water discharge pipe maintenance gate well 3 is a square well cylinder. The water discharge pipe maintenance gate well 3 is used to realize the opening and closing control and maintenance functions of the water discharge pipe 2 during operation.

[0028] In one embodiment, the vertical shaft flood discharge tunnel 4 includes an inlet annular overflow weir 41, a vertical shaft section 42, and an energy dissipation well 43 connected sequentially from top to bottom, wherein the vertical shaft section 42 is a circular shaft.

[0029] In one embodiment, the vertical shaft spillway 4 further includes a slope section 44 connecting the vertical shaft section 42 and the drainage tunnel 5. That is, the vertical shaft spillway 4 in this embodiment consists of an inlet annular overflow weir 41, a vertical shaft section 42, an energy dissipation well 43, and a slope section 44, as shown below. Figure 3 As shown, the stability of the structure can be improved by setting the slope section 44.

[0030] The integrated structure of the vertical shaft spillway tunnel and the maintenance gate well of the discharge pipe in an embodiment of the present invention can better solve the problems of large engineering workload, difficult construction of traffic bridge, and complex construction that exist in the existing combination of discharge pipe inlet and diversion tunnel intake tower, and has the following advantages: (1) Small amount of work: The vertical shaft flood discharge tunnel 4 and the water discharge pipe maintenance gate well 3 are arranged in a longitudinal manner, which reduces the amount of concrete work of the water discharge pipe inlet structure; (2) Ensure the diversion period: The diversion tunnel 1 adopts a temporary water intake tower, which reduces the amount of excavation and concrete construction work before diversion and shortens the diversion period; (3) Convenient construction: It effectively shortens the length of the traffic bridge on the top of the water intake structure, reducing the difficulty and workload of construction.

[0031] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. The integrated structure of the vertical shaft spillway tunnel and the maintenance gate well of the water discharge pipe of a pumped storage power station, characterized in that, include: The system includes a diversion tunnel, a discharge pipe, a discharge pipe maintenance gate well, a vertical shaft flood discharge tunnel, and a drainage tunnel. The discharge pipe comprises a straight section and a turning section, with the turning section located close to the vertical shaft flood discharge tunnel. The plane axis of the diversion tunnel, the plane axis of the straight section, and the plane axis of the vertical shaft flood discharge tunnel coincide. The diversion tunnel and the vertical shaft flood discharge tunnel share the drainage tunnel. The discharge pipe maintenance gate well and the vertical shaft flood discharge tunnel are arranged in a combined manner along the flow direction, and are arranged adjacent to each other.

2. The integrated structure of the vertical shaft spillway tunnel and water discharge pipe maintenance gate well of the pumped storage power station as described in claim 1, characterized in that, The straight section includes a water inlet section, a partial water pipe body section, and a gradually extending water pipe section. The turning section connects the partial water pipe body section and the gradually extending water pipe section. The gradually extending water pipe section is buried in the bottom slab of the drainage tunnel. The water inlet section is connected to the reservoir water.

3. The integrated structure of the vertical shaft spillway tunnel and water discharge pipe maintenance gate well of the pumped storage power station as described in claim 2, characterized in that, The turning section includes a planar turning section and a vertical turning section that are connected to each other. One end of the planar turning section is connected to the part of the drain pipe body, and one end of the vertical turning section is connected to the gradual extension section of the drain pipe.

4. The integrated structure of the vertical shaft spillway tunnel and water discharge pipe maintenance gate well of the pumped storage power station as described in claim 1, characterized in that, The turning angles of all the turning sections are less than 45°.

5. The integrated structure of the vertical shaft spillway tunnel and water discharge pipe maintenance gate well of the pumped storage power station as described in claim 1, characterized in that, The diversion tunnel includes a diversion tunnel inlet tower, a sealing gate, a diversion tunnel opening and closing machine room, and a permanent plug for the diversion tunnel. The inlet of the discharge pipe is buried in the diversion tunnel inlet tower and connected to the reservoir water. The permanent plug for the diversion tunnel is poured and sealed between the diversion tunnel and the maintenance gate well of the discharge pipe after the diversion is completed.

6. The integrated structure of the vertical shaft spillway tunnel and water discharge pipe maintenance gate well of the pumped storage power station as described in claim 1, characterized in that, The water discharge pipe maintenance gate well includes a gate well opening and closing machine room and a stairwell, and the water discharge pipe maintenance gate well is a square well shaft.

7. The integrated structure of the vertical shaft spillway tunnel and water discharge pipe maintenance gate well of the pumped storage power station as described in claim 1, characterized in that, The vertical shaft flood discharge tunnel includes an inlet annular overflow weir, a vertical shaft section, and an energy dissipation well, which are connected sequentially from top to bottom.

8. The integrated structure of the vertical shaft spillway tunnel and water discharge pipe maintenance gate well of the pumped storage power station as described in claim 7, characterized in that, The vertical shaft flood discharge tunnel also includes a slope section connecting the vertical shaft section and the drainage tunnel.

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