A combined arrangement method for a drop spillway and a discharge pipe inspection gate shaft in a pumped storage power station

Abstract

The present invention relates to the technical field of water conservancy and hydropower engineering, and particularly to a method for jointly arranging a drop spillway and a discharge pipe inspection gate shaft in a pumped storage power station. The method comprises the following steps: constructing a circular shaft with its centerline located on the axis of a water withdrawal tunnel, and forming a drop spillway; constructing a square shaft with its centerline located on the axis of a diversion tunnel and a discharge pipe, and coaxially arranging the discharge pipe and the diversion tunnel, and forming a discharge pipe inspection gate shaft; arranging a plurality of diversion piers on the top of an inlet weir of the drop spillway, so that the tail curve of the diversion pier is in the shape of an arc, and the side of the square shaft close to the drop spillway is also in the shape of an arc, serving as a diversion pier of the drop spillway; providing a turn on the axis of the diversion tunnel, and providing a plug in front of the turn section, so that the rear section of the turn is coaxial with the water withdrawal tunnel; and providing a turning angle of the axes of the diversion tunnel and the discharge pipe less than 30 degrees.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy and hydropower engineering, and in particular to a method for jointly arranging a drop spillway and a discharge pipe maintenance gate shaft of a pumped storage power station. Background Art

[0002] A pumped storage power station consists of three main parts: the upper and lower reservoirs, and the water diversion and power generation system. The operation and scheduling of the lower reservoir's discharge structure must meet multiple functional requirements, including flood discharge, emptying, balancing the upper and lower reservoir water levels, and ensuring ecological flow. At the same time, diversion tunnels must be arranged during the construction period to provide dry land conditions for the structures. To meet these functional requirements, the lower reservoir usually requires the following three types of discharge structures:

[0003] (1) Diversion tunnel: Its main function is to divert water during the construction period. Therefore, its inlet and outlet elevations are generally low. During the operation period, the inlet is often not in operation condition due to high water head, siltation, etc.

[0004] (2) Drop spillway: Its main function is to discharge large-volume floods (including water from the upper reservoir during power generation). It consists of a vertical drop shaft and a water discharge tunnel. It has a high inlet elevation and a large discharge capacity, and can control the water level around the normal water level.

[0005] (3) Discharge pipe: It has a relatively small discharge capacity and is mainly used to discharge ecological flow and empty the lower reservoir, while also having a flood discharge function.

[0006] To achieve the functions of opening and closing control and maintenance of the three types of discharge structures mentioned above, water inlet structures need to be arranged for the three types of discharge structures. In traditional design schemes, a water inlet structure is usually arranged for each type of discharge structure in a relatively concentrated area, and most of them are tower (well) type. However, this scheme has the following problems:

[0007] (1) Difficulty in layout: The inlets of various discharge structures are usually arranged in a concentrated manner, and their axes need to avoid each other, making the layout design difficult;

[0008] (2) Large engineering workload: Each type of water discharge structure is equipped with its own water inlet tower (well), and the number of buildings is large. In addition, in order to achieve traffic on the top of the tower (well), additional traffic bridges, roads, etc. are required, which is a large engineering workload;

[0009] (3) Construction is difficult: Each type of drainage structure generally requires its own traffic passage, construction platform and equipment. The construction layout plan of each building is complex to coordinate and the construction is difficult. Summary of the Invention

[0010] In order to solve the problems of great difficulty in arranging the discharge structure of the lower reservoir of a pumped storage power station, large engineering workload, and great construction difficulty, the present invention provides a method for jointly arranging the drop spillway and the discharge pipe inspection gate shaft of a pumped storage power station.

[0011] The technical objectives of the present invention are achieved through the following technical solutions: a method for jointly arranging a drop spillway and a discharge pipe inspection gate shaft of a pumped storage power station, wherein a circular shaft is constructed so that its center line is located on the axis of the water withdrawal tunnel, and the circular shaft is a drop spillway;

[0012] A square vertical shaft is constructed so that its center line is located on the axis of the diversion tunnel and the discharge pipe. The discharge pipe is arranged coaxially with the diversion tunnel. The square vertical shaft is a gate shaft for the discharge pipe;

[0013] A plurality of diversion piers are arranged on the top of the inlet weir of the drop-flow spillway, so that the tail curve of the diversion pier is arc-shaped, and the side of the square vertical shaft close to the drop-flow spillway is also arc-shaped, serving as a diversion pier of the drop-flow spillway;

[0014] The axis of the diversion tunnel is provided with a turn, and a plug is provided in front of the turn section, and the section after the turn is coaxial with the water withdrawal tunnel;

[0015] The axis turning angle of the diversion hole and the drain pipe is less than 30°.

[0016] In a preferred solution, the drop flow spillway is composed of three parts in the vertical direction, namely a practical weir inlet section, a drop flow section and an energy dissipation well section, and the bottom plate of the inlet section adopts a practical weir curve.

[0017] In a preferred solution, an inspection flat plate door well is provided in the drain pipe inspection door shaft, the inspection flat plate door well is opened and closed by a gate opening and closing machine at the top, and a flat plate gate well vent is provided in the inspection flat plate door well.

[0018] In a preferred solution, the end of the drop section of the drop spillway is connected to a water withdrawal tunnel, the water withdrawal tunnel is converted from a diversion tunnel, and a vent is provided at the top of the inlet section.

[0019] In a preferred solution, the drain pipe is composed of five parts along the axial direction of the diversion tunnel: an inlet and an upper flat section, a gradual section, a gate well section, a lower bend section, and a gentle slope section.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention proposes a method for combining a drop spillway and a drainpipe inspection gate shaft for a pumped-storage power station. This method simplifies the layout by combining the drainpipe inspection gate shaft with the drop spillway, reducing the three wells (towers) in the traditional layout to two. This reduces the degree of mutual influence, makes tower (well) siting more flexible, and significantly reduces the difficulty of layout.

[0022] 2. The present invention proposes a method for jointly arranging a drop spillway and a discharge pipe inspection gate shaft for a pumped-storage power station. This method requires minimal engineering effort: the number of intake towers (wells) is reduced from three to two, the amount of earthwork excavation is significantly reduced, and some projects also avoid the need for traffic bridges and roads.

[0023] 3. Simple construction: Avoid laying out a separate drainage pipe inspection portal. The diversion tunnel water inlet tower is generally at a low elevation, while the vertical shaft is usually excavated in the surrounding rock. Both are relatively simple to construct; and the two are generally far apart, so the construction will not interfere with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a plan view of the present invention.

[0025] Figure 2 This is a cross-sectional view of the drain pipe maintenance flat panel door groove along the center axis of the present invention.

[0026] Figure 3 for Figure 2 Cross-section view in the aa direction.

[0027] Figure 4 for Figure 2 Cross-section along the bb direction.

[0028] Figure 5 It is a cross-sectional view along the central axis of the drop-flow spillway retreat tunnel of the present invention.

[0029] In the above drawings: circular wellbore 1, inlet section 11, drop section 12, energy dissipation well section 13, square vertical shaft 2, maintenance flat gate well 21, gate opening and closing machine 22, flat gate well vent 23, water withdrawal tunnel 3, vent 31, diversion tunnel 4, axis 41, plug 42, discharge pipe 5, inlet and upper flat section 51, gradual section 52, gate well section 53, lower bend section 54, gentle slope section 55, inlet weir 111, diversion pier 112. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred embodiments of the present invention are described below in conjunction with specific embodiments. However, it should be understood that the drawings are only for illustrative purposes and cannot be understood as limiting this patent; in order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the positional relationships described in the drawings are only for illustrative purposes and cannot be understood as limiting this patent.

[0031] As an embodiment of the present invention, see the attached Figure 1-Figure 3 , provides a method for jointly arranging a drop spillway and a discharge pipe inspection gate shaft of a pumped storage power station, wherein a circular shaft 1 is constructed, and its centerline is located on the axis of a water withdrawal tunnel 3 for the convenience of inspection and other functions. The circular shaft 1 is a drop spillway;

[0032] A square shaft 2 is constructed. To reduce the amount of work, ensure smooth water flow and other functions, its center line is located on the axis of the diversion tunnel 4 and the discharge pipe 5. The discharge pipe 5 is arranged coaxially with the diversion tunnel 4. The square shaft 2 is a gate shaft for the discharge pipe.

[0033] A plurality of diversion piers 112 are provided on the top of the inlet weir 111 of the drop spillway, so that the tail curve of the diversion pier 112 is arc-shaped. The side of the square shaft 2 close to the drop spillway is also arc-shaped, serving as a diversion pier of the drop spillway, thereby ensuring the symmetry of the diversion pier of the drop spillway and improving the water flow conditions during flood discharge. At the same time, the arc transition is adopted, so that the water flow can be discharged smoothly through the drop spillway.

[0034] The axis 41 of the diversion tunnel 4 is provided with a bend, and a plug 42 is provided before the bend section, and the section after the bend is coaxial with the water withdrawal tunnel 3;

[0035] The turning angle of the axis 41 of the diversion hole 4 and the drain pipe 5 is less than 30°, preferably 15°, 12°, 8°, 23°, 19°, 29°, etc.

[0036] As a preferred embodiment of the present invention, the drop flow spillway is composed of three parts in the vertical direction, namely a practical weir inlet section 11, a drop flow section 12 and an energy dissipation well section 13. The bottom plate of the inlet section 11 adopts a practical weir curve.

[0037] As a preferred embodiment of the present invention, a maintenance flat gate well 21 is set in the drain pipe maintenance gate shaft. The maintenance flat gate well 21 is opened and closed by a gate opening and closing machine 22 at the top. A flat gate well vent 23 is set in the maintenance flat gate well 21.

[0038] As another preferred embodiment of the present invention, the end of the drop section 12 of the drop spillway is connected to the water withdrawal tunnel 3, and the water withdrawal tunnel 3 is converted from the diversion tunnel 4. In order to ensure smooth ventilation during the opening and closing process, a vent 31 is provided at the top of the inlet section 11.

[0039] In some preferred embodiments, the drain pipe 5 is composed of five parts along the axial direction of the diversion tunnel 4: an inlet and upper flat section 51, a gradual section 52, a gate well section 53, a downward bend section 54, and a gentle slope section 55.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for the combined arrangement of a drop spillway and a discharge pipe inspection gate shaft in a pumped storage power station, characterized in that: Constructing a circular shaft (1) so that its centerline is located on the axis of the water withdrawal tunnel (3), wherein the circular shaft (1) is a drop-flow spillway; A square vertical shaft (2) is constructed so that its center line is located on the axis of the diversion tunnel (4) and the discharge pipe (5), the discharge pipe (5) and the diversion tunnel (4) are arranged coaxially, and the square vertical shaft (2) is a gate shaft for inspecting the discharge pipe; A plurality of diversion piers (112) are arranged on the top of the inlet weir (111) of the drop-flow spillway, so that the tail curve of the diversion pier (112) is in the shape of an arc, and the side of the square shaft (2) close to the drop-flow spillway is also in the shape of an arc, serving as a diversion pier of the drop-flow spillway; The axis (41) of the diversion tunnel (4) is provided with a turn, and a plug (42) is provided in front of the turn section, and the section after the turn is coaxial with the water withdrawal tunnel (3); The turning angle of the axis (41) of the diversion hole (4) and the drain pipe (5) is less than 30°.

2. The method for jointly arranging a drop spillway and a discharge pipe inspection gate shaft of a pumped storage power station according to claim 1, characterized in that: The drop-flow spillway is composed of three parts in the vertical direction, namely a practical weir inlet section (11), a drop-flow section (12) and an energy dissipation well section (13). The bottom plate of the inlet section (11) adopts a practical weir curve.

3. A combined arrangement method of a drop spillway and a drain pipe inspection gate shaft for a pumped storage power station according to claim 1, characterized in that: A maintenance flat plate gate well (21) is provided in the drain pipe maintenance gate vertical shaft. The maintenance flat plate gate well (21) is opened and closed by a gate opening and closing machine (22) at the top. A flat plate gate well vent (23) is provided in the maintenance flat plate gate well (21).

4. The method for jointly arranging a drop spillway and a discharge pipe inspection gate shaft of a pumped storage power station according to claim 2, characterized in that: The end of the drop section (12) of the drop spillway is connected to a water withdrawal tunnel (3), the water withdrawal tunnel (3) is rebuilt from a diversion tunnel (4), and a vent (31) is provided at the top of the inlet section (11).

5. The method for jointly arranging a drop spillway and a discharge pipe inspection gate shaft of a pumped storage power station according to claim 1, characterized in that: The discharge pipe (5) is composed of five parts along the axial direction of the diversion tunnel (4): an inlet and an upper flat section (51), a gradual section (52), a gate well section (53), a lower curved section (54), and a gentle slope section (55).

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