Water inlet front retaining wall structure for surface water taking of hydropower station

Abstract

The utility model discloses a water inlet front retaining wall structure for surface water taking of a hydropower station, which belongs to the technical field of water conservancy and hydropower engineering and comprises a plurality of retaining wall sections connected in sequence. A retaining wall formed by the retaining wall sections is located on the upstream side of the intake tower, and the retaining wall sections at the two ends and the mountain and / or the intake tower form a closed area. According to the water inlet front retaining wall structure for surface water taking of the hydropower station, the problems that in an existing reservoir front retaining wall surface water taking measure with the small water level amplitude, the retaining wall structure is complex in process, long in construction period and high in investment are solved.

Description

Technical Field

[0001] This utility model belongs to the field of water conservancy and hydropower engineering technology, specifically relating to a retaining wall structure in front of the water intake for surface water intake in hydropower stations. Background Technology

[0002] In hydropower station projects, especially in temperature-stratified reservoirs, the temperature of the water released during power generation has a significant impact on fish reproduction during the breeding season. From an environmental perspective, measures should be taken to mitigate the temperature of the released water, and surface water should be drawn as much as possible. A commonly used measure is the stacked beam gate stratified water intake system. While this system allows for flexible adjustment of the water intake range, it involves frequent opening and closing operations, is inconvenient to operate, and requires significant investment. It is not economically viable for reservoirs with small water level fluctuations (i.e., a small difference between the normal storage level and the dead water level). For reservoirs with small water level fluctuations, a front-mounted retaining wall stratified water intake system can be used. This system is simple to arrange, requires no opening and closing facilities, is easy to operate, and requires less investment.

[0003] The utility model patent "Structure for Releasing Surface Water from a Reservoir" (Publication No.: CN203049553U, Publication Date: 2013-07-10) proposes the use of a buttress-type front retaining wall to release surface water from a reservoir. This front retaining wall structure has a complex process, a relatively long construction period, and a relatively high project investment. Utility Model Content

[0004] The purpose of this utility model is to provide a retaining wall structure for the inlet of a hydropower station for surface water intake, which solves the problems of complex retaining wall structure, long construction period and high investment in the existing surface water intake measures for reservoirs with small water level fluctuations.

[0005] The technical solution adopted by this utility model is a retaining wall structure in front of the water intake for surface water intake of a hydropower station, including a number of retaining wall sections 1 connected in sequence; the retaining wall formed by the number of retaining wall sections 1 is located on the upstream side of the water intake tower 5, and the retaining wall sections 1 at both ends form a closed area with the mountain 6 and / or the water intake tower 5.

[0006] The features of this utility model also include:

[0007] Structural joint 2 is set between adjacent retaining wall sections 1, and structural joint 2 is filled with cement mortar.

[0008] The retaining wall section 1 is a gravity retaining wall, including a retaining wall foundation 11, on which a wall body 12 is cast. The cross-section of the wall body 12 is an isosceles trapezoid. The distance from the connection between the two sides of the wall body 12 and the retaining wall foundation 11 to the edge of the retaining wall foundation 11 is equal.

[0009] The retaining wall foundation 11 is set on the bottom plate 7 of the water diversion channel. Several vertical reinforcing bars are pre-embedded on the bottom plate 7 of the water diversion channel. The retaining wall foundation 11 is connected and fixed to the bottom plate 7 of the water diversion channel through several vertical reinforcing bars.

[0010] The retaining wall foundation 11 is embedded in the bottom plate 7 of the water diversion channel. Several horizontal reinforcing bars are pre-embedded in the contact surface between the bottom plate 7 of the water diversion channel and the retaining wall foundation 11. The retaining wall foundation 11 is connected and fixed to the bottom plate 7 of the water diversion channel through several horizontal reinforcing bars.

[0011] Several pressure pipes 3 are installed inside the bottom of the wall 12 along the direction of water flow. The pressure pipes 3 include forward pressure pipes 32 and reverse pressure pipes 31, which are arranged at intervals.

[0012] Both the forward pressure pipe 32 and the reverse pressure pipe 31 are equipped with flap valves 4 on their inlet sides; the flap valve 4 of the forward pressure pipe 32 is located on the downstream side of the retaining wall section 1, and the flap valve 4 of the reverse pressure pipe 31 is located on the upstream side of the retaining wall section 1.

[0013] The elevation of retaining wall section 1 is lower than the dead water level of the hydropower station.

[0014] The upstream and downstream sides of the top of retaining wall section 1 are both arc-shaped.

[0015] The beneficial effects of this utility model are:

[0016] This utility model relates to a retaining wall structure in front of the water intake of a hydropower station's surface water intake. It adopts a gravity retaining wall as the retaining wall in front of the surface water intake of a reservoir with a small water level fluctuation. This type of retaining wall structure is simple, easy to construct, requires less investment, and is economical. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the inlet retaining wall structure of the present invention for surface water intake in hydropower stations, which forms a closed area with the mountain and the water intake tower;

[0018] Figure 2 This is a schematic diagram of the connection structure of the retaining wall section of the retaining wall structure in front of the water intake for surface water intake in hydropower stations according to this utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the retaining wall structure in front of the water intake for surface water intake in hydropower stations, which forms a closed area with the mountain.

[0020] Figure 4 This is a schematic diagram of the structure of the inlet retaining wall structure for surface water intake in hydropower stations, which forms a closed area with the water intake tower.

[0021] Figure 5 This is a schematic diagram of the cross-sectional structure of the retaining wall section of the retaining wall structure in front of the water intake for surface water intake in hydropower stations according to this utility model.

[0022] Figure 6 This is a schematic diagram of the stacked connection between the inlet retaining wall structure of the present invention for surface water intake in hydropower stations and the bottom plate of the water diversion channel;

[0023] Figure 7 This is a schematic diagram of the embedding connection of the bottom plate of the water intake channel in the inlet retaining wall structure for surface water intake in hydropower stations, which is a feature of this utility model.

[0024] In the diagram: 1. Retaining wall section; 11. Retaining wall foundation; 12. Wall body; 2. Structural joint; 3. Flat pressure pipe; 31. Reverse flat pressure pipe; 32. Positive flat pressure pipe; 4. Flap gate; 5. Water intake tower; 6. Mountain; 7. Water diversion channel bottom slab. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] This utility model relates to a gravity retaining wall structure for the inlet of a hydropower station's surface water intake. Figure 1 As shown, it includes several retaining wall sections 1 connected in sequence. Each retaining wall section 1 is generally set to 10-15m according to construction requirements and project needs. For example... Figure 2 As shown, structural joints 2 are provided between adjacent retaining wall sections 1, and the structural joints 2 are filled with cement mortar to ensure the stability, continuity, and sealing of the entire retaining wall structure. The entire retaining wall structure is divided into several retaining wall sections 1 for ease of construction. The retaining wall formed by several retaining wall sections 1 is located upstream of the water intake tower 5. The overall retaining wall structure can be connected to the water intake tower 5 at one end and to the mountain 6 at the other end, forming a structure like... Figure 1 The enclosed area shown; or it can be connected to the mountains on both sides at both ends to form a shape like... Figure 3 The enclosed area shown; or it can be connected to both ends of the water inlet tower 5 to form a closed area as shown; Figure 4 The enclosed area shown.

[0027] like Figure 5 As shown, retaining wall section 1 includes a retaining wall foundation 11, on which a wall body 12 is cast integrally. The retaining wall foundation 11 and the wall body 12 are cast as one piece. The cross-section of the wall body 12 is an isosceles trapezoid, meaning that the inclination angles of its front and back faces are the same, as shown in the figure. Figure 5 Angle a is marked; the distance from the connection point between the two sides of the wall 12 and the retaining wall foundation 11 to the edge of the retaining wall foundation 11 is equal, such as... Figure 5 The marked distance b. The symmetrical shape of retaining wall section 1 is beneficial to the stability of the retaining wall structure. The upstream and downstream sides of the top of retaining wall section 1 are both arc-shaped, and the arcs connect smoothly with the wall surface and back. The arc-shaped design of the top of retaining wall section 1 ensures good water flow conditions and low head loss. The elevation of retaining wall section 1 is lower than the dead water level of the hydropower station.

[0028] There are two ways to fix the retaining wall foundation 11 to the bottom plate of the water diversion channel 7:

[0029] Firstly, the retaining wall foundation 11 is set on the bottom plate 7 of the water diversion channel. Several vertical reinforcing bars are pre-embedded on the bottom plate of the water diversion channel, and the retaining wall foundation 11 is connected and fixed to the bottom plate of the water diversion channel through several vertical reinforcing bars.

[0030] Secondly, the retaining wall foundation 11 is embedded in the bottom plate 7 of the water diversion channel. Several horizontal reinforcing bars are pre-embedded in the contact surface between the bottom plate 7 of the water diversion channel and the retaining wall foundation 11. The retaining wall foundation 11 is connected and fixed to the bottom plate 7 of the water diversion channel through several horizontal reinforcing bars.

[0031] Several pressure-equalizing pipes 3 are installed at the bottom of the retaining wall 12 along the water flow direction. The pressure-equalizing pipes 3 include forward pressure-equalizing pipes 32 and reverse pressure-equalizing pipes 31, which are arranged alternately. The water flow in the forward pressure-equalizing pipes 32 flows from the upstream reservoir to the inlet, while the water flow in the reverse pressure-equalizing pipes 31 flows from the inlet to the upstream reservoir. Both the forward pressure-equalizing pipes 32 and 31 are equipped with flap valves 4 on their inlet sides; the flap valve 4 of the forward pressure-equalizing pipes 32 is located on the downstream side of the retaining wall section 1, and the flap valve 4 of the reverse pressure-equalizing pipes 31 is located on the upstream side of the retaining wall section 1.

[0032] The main function of the pressure equalization pipe 3 is to control the head difference between the upstream and downstream of the upstream retaining wall structure, ensuring the overall stability of the upstream retaining wall structure during impoundment and emergency maintenance venting. Taking the upstream retaining wall structure itself, which can withstand a head difference of up to 1m, as an example: the forward pressure equalization pipe 32 is used when filling the downstream inlet of the upstream retaining wall with water, and the reverse pressure equalization pipe 31 is used for emergency venting during dam emergency maintenance. During normal operation of the power station, the head difference between the upstream and downstream of the upstream retaining wall is 0.25m. At this time, the flap valve 4 of the pressure equalization pipe 3 is normally closed. When the head difference between the upstream side (upstream reservoir side) and the downstream side (near the inlet side) is 0.5m, the flap valve 4 gradually opens. When the head difference increases to 1m, the flap valve 4 fully opens, and the water flows from the side with the higher head to the side with the lower head. When the head difference is less than 1m, the flap valve 4 gradually closes, and when the head difference is 0.5m, the flap valve 4 is completely closed. During the impoundment and maintenance of the hydropower station, the rate of change of the overall water level in the reservoir is controlled by the amount of water discharged. Combined with the pressure pipes 3 on both sides of the retaining wall, the head difference between the front and rear sides of the retaining wall is controlled to not exceed its own limit.

[0033] The construction process of the retaining wall structure in front of the water intake of a hydropower station, which is based on this utility model, is as follows:

[0034] (1) Construction process of the pre-construction retaining wall with the foundation on the bottom slab of the water diversion channel

[0035] During construction, the bottom slab 7 of the water diversion channel is poured first. Before pouring the bottom slab 7, vertical reinforcing bars are pre-installed at the location of the front retaining wall structure. One end of the reinforcing bar extends into the bottom slab 7, and the other end extends into the bottom of the front retaining wall structure. Then, the retaining wall sections 1 are poured in layers and sections on the bottom slab 7, and the structural joints 2 between the retaining wall sections 1 are filled. The two ends of the front retaining wall structure are connected to the water intake tower 5 and / or the mountain 6 to form a closed area.

[0036] (2) Construction process of the retaining wall with the foundation in the bottom slab of the water diversion channel

[0037] During construction, the bottom slab 7 of the water diversion channel on the upstream and downstream sides of the front retaining wall is poured first. Before pouring the bottom slab 7, the bottom slab 7 is divided into upstream and downstream sections by the front retaining wall structure. Horizontal reinforcing bars are pre-embedded on the downstream side of the upstream section and the upstream side of the downstream section. One end of the horizontal reinforcing bar extends into the bottom slab 7, and the other end extends into the retaining wall foundation 11 of the front retaining wall structure. Then, the retaining wall section 1 is poured in layers and sections within the reserved position of the front retaining wall structure on the bottom slab 7, and the structural joints 2 between the retaining wall sections 1 are filled. The two ends of the front retaining wall structure are connected to the water intake tower 5 and / or the mountain 6 to form a closed area.

[0038] This utility model relates to a retaining wall structure for the intake of surface water in hydropower stations. It blocks the low-temperature water from the lower layers of the reservoir, allowing surface water to pass through the top of the wall into the water diversion channel, thereby raising the temperature of the downstream water by drawing in the high-temperature surface water. The retaining wall structure is simple to construct, has a short construction period, and requires relatively little investment.

[0039] Example 1

[0040] This embodiment provides a retaining wall structure in front of the water intake for surface water intake in hydropower stations, such as... Figure 1 As shown, it includes several retaining wall sections 1 connected in sequence, each section being 10-20m long; the retaining wall formed by these sections 1 is located upstream of the water intake tower 5, with one end of each section 1 connected to the water intake tower 5 and the other end connected to the mountain 6, forming a structure as shown. Figure 1 The enclosed area is shown. Structural joint 2 is provided between adjacent retaining wall sections 1, and structural joint 2 is filled with cement mortar. The elevation of retaining wall section 1 is lower than the dead water level of the hydropower station.

[0041] Example 2

[0042] This embodiment provides a retaining wall structure in front of the intake for surface water intake in a hydropower station, comprising several sequentially connected retaining wall sections 1, each 15m long; the retaining wall formed by the several retaining wall sections 1 is located upstream of the intake tower 5, and the retaining wall sections 1 at both ends are connected to the mountain 6, forming a retaining wall with the intake tower 5 as shown in the figure. Figure 3 The enclosed area is shown. Structural joint 2 is provided between adjacent retaining wall sections 1, and structural joint 2 is filled with cement mortar. The elevation of retaining wall section 1 is lower than the dead water level of the hydropower station.

[0043] Example 3

[0044] This embodiment provides a retaining wall structure in front of the intake for surface water intake in a hydropower station, including several retaining wall sections 1 connected in sequence, each section being 10-20m long; the retaining wall formed by the several retaining wall sections 1 is located upstream of the intake tower 5, and the retaining wall sections 1 at both ends are connected to form a structure as shown in the figure. Figure 4 The enclosed area is shown. Structural joint 2 is provided between adjacent retaining wall sections 1, and structural joint 2 is filled with cement mortar. The elevation of retaining wall section 1 is lower than the dead water level of the hydropower station.

[0045] Example 4

[0046] This embodiment provides a retaining wall structure in front of the water intake for surface water intake in hydropower stations, such as... Figure 1 As shown, it includes several retaining wall sections 1 connected in sequence; the retaining wall formed by the several retaining wall sections 1 is located upstream of the water intake tower 5, with one end of the retaining wall section 1 connected to the water intake tower 5 and the other end connected to the mountain 6, forming a structure as shown. Figure 1 The enclosed area is shown. Structural joint 2 is provided between adjacent retaining wall sections 1, and structural joint 2 is filled with cement mortar. The elevation of retaining wall section 1 is lower than the dead water level of the hydropower station.

[0047] The retaining wall section 1 includes a retaining wall foundation 11, on which a wall body 12 is cast. The wall body 12 has an isosceles trapezoidal cross-section. The distances from the connection points between the two sides of the wall body 12 and the retaining wall foundation 11 to the edge of the retaining wall foundation 11 are equal. The retaining wall foundation 11 is set on the bottom slab 7 of the irrigation canal, such as... Figure 6 As shown, several vertical reinforcing bars are pre-embedded in the bottom slab of the water diversion channel, and the retaining wall foundation 11 is connected and fixed to the bottom slab of the water diversion channel through several vertical reinforcing bars. The upstream and downstream sides of the top of the retaining wall section 1 are both arc-shaped.

[0048] Example 5

[0049] This embodiment provides a retaining wall structure in front of the intake for surface water intake in a hydropower station, including several retaining wall sections 1 connected in sequence; the retaining wall formed by the several retaining wall sections 1 is located upstream of the intake tower 5, and the retaining wall sections 1 at both ends are connected to the mountain 6, forming a structure with the intake tower 5 as follows: Figure 3 The enclosed area is shown. Structural joint 2 is provided between adjacent retaining wall sections 1, and structural joint 2 is filled with cement mortar. The elevation of retaining wall section 1 is lower than the dead water level of the hydropower station.

[0050] The retaining wall section 1 includes a retaining wall foundation 11, on which a wall body 12 is cast. The wall body 12 has an isosceles trapezoidal cross-section. The distances from the connection points between the two sides of the wall body 12 and the retaining wall foundation 11 to the edges of the retaining wall foundation 11 are equal. The retaining wall foundation 11 is embedded in the bottom slab 7 of the water diversion channel. Several horizontal reinforcing bars are pre-embedded in the contact surface between the bottom slab 7 of the water diversion channel and the retaining wall foundation 11. The retaining wall foundation 11 is connected and fixed to the bottom slab 7 of the water diversion channel by several horizontal reinforcing bars. The upstream and downstream sides of the top of the retaining wall section 1 are both arc-shaped.

[0051] Example 6

[0052] This embodiment provides a retaining wall structure in front of the intake for surface water intake in a hydropower station, including several retaining wall sections 1 connected in sequence; the retaining wall formed by the several retaining wall sections 1 is located upstream of the intake tower 5, and the retaining wall sections 1 at both ends are connected to the mountain 6, forming a structure with the intake tower 5 as follows: Figure 3 The enclosed area is shown. Structural joints 2 are provided between adjacent retaining wall sections 1, and structural joints 2 are filled with cement mortar. The elevation of retaining wall section 1 is lower than the dead water level of the hydropower station.

[0053] The retaining wall section 1 includes a retaining wall foundation 11, on which a wall body 12 is cast. The wall body 12 has an isosceles trapezoidal cross-section. The distances from the connection points between the two sides of the wall body 12 and the retaining wall foundation 11 to the edges of the retaining wall foundation 11 are equal. The retaining wall foundation 11 is embedded in the bottom slab 7 of the water diversion channel. Several horizontal reinforcing bars are pre-embedded in the contact surface between the bottom slab 7 of the water diversion channel and the retaining wall foundation 11. The retaining wall foundation 11 is connected and fixed to the bottom slab 7 of the water diversion channel by several horizontal reinforcing bars. The upstream and downstream sides of the top of the retaining wall section 1 are both arc-shaped.

[0054] Several pressure pipes 3 are installed inside the bottom of the wall 12 along the direction of water flow, such as Figure 2 As shown, the pressure equalization pipe 3 includes a forward pressure equalization pipe 32 and a reverse pressure equalization pipe 31, which are arranged at intervals. Both the forward pressure equalization pipe 32 and the reverse pressure equalization pipe 31 are equipped with flap valves 4 on their inlet sides; the flap valve 4 of the forward pressure equalization pipe 32 is located downstream of the retaining wall section 1, and the flap valve 4 of the reverse pressure equalization pipe 31 is located upstream of the retaining wall section 1.

Claims

1. A retaining wall structure in front of the water intake for surface water intake in a hydropower station, characterized in that, It includes several retaining wall sections (1) connected in sequence; the retaining wall formed by the several retaining wall sections (1) is located on the upstream side of the water intake tower (5), and the retaining wall sections (1) at both ends form a closed area with the mountain (6) and / or the water intake tower (5).

2. The inlet retaining wall structure for surface water intake in a hydropower station according to claim 1, characterized in that, A structural joint (2) is provided between adjacent retaining wall sections (1), and the structural joint (2) is filled with cement mortar.

3. The inlet retaining wall structure for surface water intake in a hydropower station according to claim 1 or 2, characterized in that, The retaining wall section (1) is a gravity retaining wall, including a retaining wall foundation (11), on which a wall body (12) is cast. The cross section of the wall body (12) is an isosceles trapezoid. The distance from the connection between the two sides of the wall body (12) and the retaining wall foundation (11) to the edge of the retaining wall foundation (11) is equal.

4. The inlet retaining wall structure for surface water intake in a hydropower station according to claim 3, characterized in that, The retaining wall foundation (11) is set on the bottom plate (7) of the water diversion channel. Several vertical reinforcing bars are pre-embedded on the bottom plate (7) of the water diversion channel. The retaining wall foundation (11) is connected and fixed to the bottom plate (7) of the water diversion channel through several vertical reinforcing bars.

5. The inlet retaining wall structure for surface water intake in a hydropower station according to claim 3, characterized in that, The retaining wall foundation (11) is embedded in the bottom plate (7) of the water diversion channel. Several horizontal reinforcing bars are pre-embedded in the contact surface between the bottom plate (7) of the water diversion channel and the retaining wall foundation (11). The retaining wall foundation (11) is connected and fixed to the bottom plate (7) of the water diversion channel through several horizontal reinforcing bars.

6. The inlet retaining wall structure for surface water intake in a hydropower station according to claim 3, characterized in that, Several pressure pipes (3) are installed inside the bottom of the wall (12) along the direction of water flow. The pressure pipes (3) include a forward pressure pipe (32) and a reverse pressure pipe (31), and the forward pressure pipes (32) and the reverse pressure pipes (31) are arranged at intervals.

7. The inlet retaining wall structure for surface water intake in a hydropower station according to claim 6, characterized in that, Both the forward pressure pipe (32) and the reverse pressure pipe (31) are equipped with flap valves (4) on their inlet sides; the flap valve (4) of the forward pressure pipe (32) is located on the downstream side of the retaining wall section (1), and the flap valve (4) of the reverse pressure pipe (31) is located on the upstream side of the retaining wall section (1).

8. The inlet retaining wall structure for surface water intake in a hydropower station according to claim 1, characterized in that, The elevation of the retaining wall section (1) is lower than the dead water level of the hydropower station.

9. The inlet retaining wall structure for surface water intake in a hydropower station according to claim 1, characterized in that, The upstream and downstream sides of the top of the retaining wall section (1) are both arc-shaped.

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