Overlapped arrangement structure of overflow dam and power plant

Abstract

The utility model discloses an overlap type arrangement structure of an overflow dam and a power plant in the field of hydraulic engineering, which comprises the overflow dam and the power plant located in the overflow dam, the overflow surface of the overflow dam is provided with a plant top gate capable of entering the power plant, the downstream end of the overflow dam is close to the bottom of a stilling pool, and the overflow surface of the overflow dam is close to the bottom of the stilling pool. The draft tube of the power plant is arranged in the differential type nose ridge, and a water outlet of the draft tube is flush with the bottom of the stilling pool. The power plant is arranged in the overflow dam, so that the power plant and the overflow dam form a whole, the length of a dam section can be effectively reduced, the overflow structure and a plant power generation system have the same water flow characteristic, and water conservancy development of a narrow river valley is facilitated; the overflow water and the tail water can overflow reasonably while not influencing each other, and the synergistic effect of combining underflow energy dissipation and flip flow energy dissipation is achieved.

Description

Technical Field

[0001] The utility model relates to the field of water conservancy projects, in particular to an overlapping arrangement structure of an overflow dam and a power plant. Background Art

[0002] At present, when designing the dam structure, most hydropower plants need to set up an overflow dam section to discharge the water that is higher than the overflow weir top after the river is cut off, and at the same time set up a plant dam section, and arrange power generation equipment in this dam section for power generation. The conventional structural layout is to arrange the power plant and related facilities in other water retaining dam sections except the overflow dam section. The two structural arrangements are staggered in plane, and a separate traffic structure is required to enter the plant for maintenance. This structure is generally set in a wider river channel, but when the dam is arranged in a narrow river valley or in a complex terrain, the traditional plane staggered arrangement will be difficult due to insufficient plane width, and the facade space cannot be fully utilized. For narrow river valleys, the current conventional practice is to set some structures or equipment in the mountains on both sides of the valley, but this method is costly. Utility Model Content

[0003] In order to overcome the above-mentioned deficiencies of the existing dam structure, the technical problem to be solved by the utility model is to provide an overlapping arrangement structure of the overflow dam and the power plant building which can improve the space utilization of the dam.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] The overlapping arrangement structure of the overflow dam and the power plant includes an overflow dam arranged in the overflow section of the dam body and a power plant located in the dam body, wherein the power plant is located inside the downstream end of the overflow dam, and a water inlet pressure steel pipe connecting the upstream side of the dam body and the power plant is provided inside the overflow dam, a building top gate for entering the power plant is provided on the overflow surface of the overflow dam, an energy dissipation pool is provided on the outer side of the bottom of the downstream end of the overflow dam, the downstream end of the overflow dam is close to the bottom of the energy dissipation pool, and a differential nose sill is provided at this end, and the tailwater pipe of the power plant is provided in the differential nose sill, and its outlet is flush with the bottom of the energy dissipation pool.

[0006] Furthermore, the overflow dam faces the center of the river valley, and a crest gate is provided between the upstream end of the overflow dam and the side walls of the dam body on both sides thereof.

[0007] Furthermore, the water inlet of the water inlet pressure steel pipe is close to the top of the overflow dam, and a maintenance gate and a working gate are provided in the water inlet.

[0008] Furthermore, the power plant includes a main plant for installing a generator set and an auxiliary plant as a control room. The auxiliary plant and the main plant are arranged according to the direction of water flow, and the top gate of the plant is set on the top of the main plant.

[0009] Furthermore, the energy dissipation pool is enclosed by an energy dissipation pool bottom plate and energy dissipation pool side walls on both sides of the energy dissipation pool bottom plate.

[0010] The beneficial effects of the utility model are as follows: by directly arranging the power plant building inside the overflow dam, the power plant building and the overflow dam form a whole, which saves the plane space of the dam body and makes full use of the vertical space, which can effectively reduce the length of the dam section, thereby saving costs, shortening the construction period, and being beneficial to the water conservancy development of narrow river valleys; this overlapping arrangement method can make the overflow dam section face the center of the river valley, and the overflow structure and the power generation system of the power plant building have the same water flow characteristics, which can optimize the problem of poor water flow conditions when the power plant in the traditional dam is located in other water retaining dam sections; the tailwater pipe of the power plant building is arranged in the differential nose sill at the downstream end of the overflow dam, so that the overflow water and the tailwater can reasonably overflow without affecting each other, thereby achieving the synergistic efficiency effect of combining bottom flow energy dissipation and diversion flow energy dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a main cross-sectional view of the structure of the utility model;

[0012] Figure 2 It is a side view of the structure of the utility model.

[0013] Marked in the figure are, 1-overflow dam, 2-power plant, 3-water inlet pressure pipe, 4-stilling pool, 5-tailwater pipe, 6-dam side wall, 7-differential nose sill, 11-overflow surface, 12-weir top gate, 21-plant top gate, 22-main plant, 23-auxiliary plant, 31-water inlet, 32-maintenance gate, 33-working gate, 41-stilling pool bottom plate, 42-stilling pool side wall. DETAILED DESCRIPTION

[0014] The utility model is further described below in conjunction with the accompanying drawings.

[0015] It should be noted that if there are directional indication terms in the present invention, such as up, down, left, right, front, and back directions and orientation terms, they are for the purpose of facilitating the description of the relative position relationship between components, and are not for the absolute position of the related components or the position relationship between components. They are only used to explain the relative position relationship and movement of the components in a certain posture. If the specific posture changes, the directional indication will also change accordingly. If there are terms related to quantity in the present invention, such as "multiple", "multiple", "several", etc., they specifically refer to two or more.

[0016] like Figure 1 , Figure 2 As shown, the overlapping arrangement structure of the overflow dam and the power plant building of the utility model comprises an overflow dam 1 arranged in the overflow section of the dam body and a power plant building 2 located in the dam body, wherein the power plant building 2 is located inside the downstream end of the overflow dam 1, and a water inlet pressure steel pipe 3 connecting the upstream side of the dam body and the power plant building 2 is provided in the overflow dam 1, and a building top gate 21 for entering the power plant building 2 is provided on the overflow surface 11 of the overflow dam 1, and an energy dissipation pool 4 is provided on the outer side of the bottom of the downstream end of the overflow dam 1, and the downstream end of the overflow dam 1 is close to the bottom of the energy dissipation pool 4, and a differential nose sill 7 is provided at this end, and the tailwater pipe 5 of the power plant building 2 is arranged in the differential nose sill 7, and its outlet is flush with the bottom of the energy dissipation pool 4.

[0017] The solution of the utility model is suitable for dams with large vertical space, ensuring that there is enough height space between the overflow surface 11 of the downstream section of the overflow dam 1 and the bottom of the dam body to arrange the power plant 2. In order to save space, the top of the power plant 2 can be arranged as close to the overflow surface 11 of the overflow dam 1 as possible, which may result in insufficient space on the top of the plant for maintenance. Therefore, a plant top gate 21 can be set on the overflow surface 11, and the power plant 2 can be directly entered through the plant top gate 21 when maintenance is required. In addition, in order to reduce the scouring of the downstream side of the dam body by the water flow, it is generally necessary to set up an energy dissipation pool. Traditional dams usually need to set up two energy dissipation pools. After the utility model overlaps the overflow dam 1 and the power plant 2, the water flow discharged from the overflow surface 11 and the tailwater discharged from the tailwater pipe 5 of the power plant 2 enter the same energy dissipation pool 4, which can reduce the number of energy dissipation pools and reduce the scouring range of the downstream river channel. At the same time, the utilization rate and efficiency of energy dissipation measures are maximized.

[0018] In order to reduce the scouring of the stilling pool 4 by the water flow discharged from the overflow dam 1, the downstream end of the overflow dam 1 can be set close to the bottom of the stilling pool 4. At the same time, in order to avoid the mutual influence between the water flow discharged from the overflow dam 1 and the water flow discharged from the tailwater pipe 5, a differential nose sill 7 is provided at the downstream end of the overflow dam 1, and then the tailwater pipe 5 of the power plant 2 is set on the differential nose sill 7, and the outlet of the tailwater pipe 5 is made flush with the bottom of the stilling pool 4. In this way, the water flow discharged from the overflow dam 1 can form a diversion flow when passing through the differential nose sill 7, thereby leaving space for the tailwater below, so that the tailwater can be discharged along the bottom of the stilling pool 4, and will not interfere with the water flow discharged from the overflow dam 1, thereby improving the smoothness of the tailwater drainage, and at the same time achieving the synergistic effect of combining bottom flow energy dissipation and diversion flow energy dissipation.

[0019] When designing the dam body, it is best to make the overflow dam 1 face the center of the river valley, so that the water flow discharged from the overflow surface 11 and the water flow entering the water inlet pressure steel pipe 3 have the best and same characteristics, thereby optimizing the problem of poor water flow conditions when the powerhouse in the traditional dam is located in other water retaining dam sections. In addition, in order to control the discharge volume and discharge timing of the overflow dam 1, a crest gate 12 is provided between the upstream end of the overflow dam 1 and the dam body side walls 6 on both sides thereof.

[0020] For the design of the metal penstock 3, in order to increase the water flow drop, the water inlet 31 of the water inlet penstock 3 is preferably close to the top of the overflow dam 1. For easy inspection and maintenance, an inspection gate 32 and a working gate 33 are provided in the water inlet 31.

[0021] In order to make better use of space, when designing the power plant 2, the power plant 2 can be divided into a main plant 22 for installing the generator set and an auxiliary plant 23 as a control room, and the auxiliary plant 23 and the main plant 22 are arranged according to the direction of water flow. In this way, the space at the downstream end of the overflow dam 1 can be better utilized, and the rationality of the layout of the power plant 2 can be increased. At the same time, this arrangement can also lengthen the overflow dam 1 along the direction of water flow, reduce the single-width flow on the overflow surface, and achieve better energy dissipation effect.

[0022] As for the structure of the energy dissipation pool 4, the solution adopted by the utility model is that the energy dissipation pool 4 is enclosed by an energy dissipation pool bottom plate 41 and energy dissipation pool side walls 42 on both sides of the energy dissipation pool bottom plate 41. A convex structure is provided at one end of the energy dissipation pool bottom plate 41 away from the overflow dam 1, thereby enclosing a trough-shaped area with the energy dissipation pool side walls 42 on both sides and the overflow dam 1 to form the energy dissipation pool 4.

[0023] In summary, the utility model directly sets the power plant 2 inside the overflow dam 1 so that the power plant 2 and the overflow dam 1 form a whole, which saves the plane space of the dam body and makes full use of the vertical space, which can effectively reduce the length of the dam section, thereby saving costs, shortening the construction period, and is conducive to the water conservancy development of narrow river valleys; this overlapping arrangement method can make the overflow dam section face the center of the river valley, and the overflow structure and the power generation system of the power plant have the same water flow characteristics, which can optimize the problem of poor water flow conditions when the power plant in the traditional dam is located in other water retaining dam sections. At the same time, the power generation tail water and the overflow water can share a stilling pool 4, which can not only reduce the scouring range of the downstream river channel, but also maximize the utilization rate and efficiency of the energy dissipation measures, and optimize the energy dissipation coordination relationship; in addition, the tail water pipe 5 of the power plant 2 is set in the differential nose sill 7 at the downstream end of the overflow dam 1, so that the overflow water and the tail water can reasonably overflow without affecting each other, so as to achieve the synergistic effect of combining bottom flow energy dissipation and diversion flow energy dissipation. The utility model realizes that an integral dam section satisfies the purposes of power generation, overflow, maintenance and coordinated energy dissipation simultaneously by reasonably arranging the power plant 2, the overflow dam 1, the differential nose sill 7 and the tailwater pipe 5, and has good practicality and application value.

Claims

1. An overlapping arrangement structure of an overflow dam and a power plant, comprising an overflow dam (1) arranged at the overflow section of a dam body and a power plant (2) located inside the dam body, characterized in that: The power plant (2) is located inside the downstream end of the overflow dam (1). A water inlet pressure steel pipe (3) is provided inside the overflow dam (1) to connect the upstream side of the dam body with the power plant (2). A plant top gate (21) is provided on the overflow surface (11) of the overflow dam (1) to allow access to the power plant (2). An energy dissipation pool (4) is provided on the outer side of the bottom of the downstream end of the overflow dam (1). The downstream end of the overflow dam (1) is close to the bottom of the energy dissipation pool (4) and a differential nose sill (7) is provided at this end. The tailwater pipe (5) of the power plant (2) is arranged in the differential nose sill (7), and its outlet is flush with the bottom of the energy dissipation pool (4).

2. The overlapping arrangement structure of the overflow dam and the power plant building according to claim 1, characterized in that: The overflow dam (1) faces the center of the river valley, and a crest gate (12) is provided between the upstream end of the overflow dam (1) and the dam body side walls (6) on both sides thereof.

3. The overlapping arrangement structure of the overflow dam and the power plant building according to claim 1 is characterized in that: The water inlet (31) of the water inlet pressure steel pipe (3) is close to the top of the overflow dam (1), and a maintenance gate (32) and a working gate (33) are arranged in the water inlet (31).

4. The overlapping arrangement structure of the overflow dam and the power plant building according to claim 1 is characterized in that: The power plant (2) comprises a main plant (22) for installing a generator set and an auxiliary plant (23) serving as a control room. The auxiliary plant (23) and the main plant (22) are arranged in a water flow direction. The plant top gate (21) is arranged on the top of the main plant (22).

5. The overlapping arrangement structure of the overflow dam and the power plant building according to claim 1 is characterized in that: The energy dissipation pool (4) is enclosed by an energy dissipation pool bottom plate (41) and energy dissipation pool side walls (42) on both sides of the energy dissipation pool bottom plate (41).

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