Differential type stilling well structure for large water level fall and poor side slope geological condition

Abstract

The utility model belongs to the technical field of water conservancy projects, and particularly relates to a differential type stilling well structure used for large water level fall and poor side slope geological conditions, which comprises an inlet, a well body, a bottom plate and an outlet which are sequentially connected along the water flow direction, the well body is of a vertical or inclined cylindrical or box-shaped structure, the inlet is communicated with the upper part of the well body, and the bottom plate is communicated with the outlet. The bottom plate is arranged at the bottom of the well body and communicated with the outlet, the inlet and the outlet are arranged in a staggered mode on the horizontal projection plane, a unique water flow path is formed through inlet and outlet staggered and well type construction, and sufficient disturbance energy dissipation of water flow in each stage of stilling well can be achieved without depending on a large building. The problems that in a traditional scheme, energy dissipation is insufficient, the structural size is large, stability is difficult, and the manufacturing cost is high are solved.

Description

Technical Field

[0001] This utility model belongs to the field of water conservancy engineering technology, specifically relating to a differential stilling well structure for use in areas with large water level differences and poor slope geological conditions. Background Technology

[0002] In the field of water conservancy and hydropower engineering, projects often involve drainage flowing down slopes. In such cases, energy dissipation treatment of the drainage flow must be implemented based on topographical and geological conditions. A reasonable energy dissipation structure is crucial for ensuring the technical feasibility and socio-economic benefits of the project.

[0003] The engineering challenges are particularly significant when drainage structures face design scenarios with high drainage heads and poor slope geological conditions. Traditional conventional design schemes have many drawbacks in dealing with such situations: on the one hand, to meet energy dissipation requirements, the structure size is often too large, increasing the difficulty of construction and resource consumption; on the other hand, the energy dissipation effect of the water flow is insufficient, requiring further energy dissipation measures at the water outlet before discharge, which not only prolongs the engineering process but also increases the project cost. In addition, under poor slope geological conditions, the stability of large structures is difficult to guarantee effectively, further exacerbating the risks and complexity of the project. Therefore, for special working conditions with large water level differences and poor slope geological conditions, there is an urgent need for a new type of energy dissipation structure that can achieve sufficient energy dissipation, ensure structural stability, reduce the size of the structure, and lower the project cost. Utility Model Content

[0004] The purpose of this invention is to provide a differential stilling well structure for use in areas with large water level differences and poor slope geological conditions, in order to solve the problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a differential stilling well structure for areas with large water level differences and poor slope geological conditions, comprising an inlet, a well body, a bottom plate, and an outlet connected sequentially along the water flow direction. The well body is a vertical or inclined cylindrical or box-shaped structure. The inlet is connected to the upper part of the well body, and the bottom plate is located at the bottom of the well body and connected to the outlet. The inlet and outlet are staggered on the horizontal projection plane.

[0006] Preferably, the plurality of energy dissipation wells are arranged in a stepped manner along the slope elevation direction, the horizontal spacing between adjacent energy dissipation wells is smaller than the arrangement spacing of conventional energy dissipation structures, and the vertical height difference between adjacent energy dissipation wells is smaller than the arrangement height difference of conventional energy dissipation structures.

[0007] Preferably, a step is provided between adjacent stilling wells, with one end of the step connecting to the outlet of the upstream stilling well and the other end connecting to the inlet of the downstream stilling well.

[0008] Preferably, the cross-sectional shape of the outlet is rectangular, circular, or other polygonal, and the outlet size matches the inlet size of the downstream connecting structure.

[0009] The beneficial effects of this utility model are as follows: the structure forms a unique water flow path through the staggered inlet and outlet and well-type construction, which can achieve sufficient disturbance and energy dissipation of water flow in each stage of stilling well without relying on large buildings, thus solving the problems of insufficient energy dissipation, large structural size, difficulty in stabilization and high cost in traditional solutions; due to the small size of a single stilling well and the optimized layout principle, its own stability is easily satisfied, which can reduce the size of the building structure under the slope, eliminate the end stilling pool, simplify the water flow and downstream connection process, and at the same time have the advantages of simple structure and convenient construction, which can significantly reduce project costs and improve economic and social benefits. Attached Figure Description

[0010] Figure 1 This is a plan view of the present invention;

[0011] Figure 2 This is a longitudinal sectional view of the present invention;

[0012] Figure 3 This is a plan view of a single energy dissipation well in this utility model;

[0013] Figure 4 This is a cross-sectional view of a single energy dissipation well in this utility model. Detailed Implementation

[0014] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0015] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixed connection," and "fixed connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings and preferred embodiments.

[0018] like Figure 1 As shown, a differential stilling well structure is used for situations with large water level differences and poor slope geological conditions. The stilling well is a reinforced concrete structure. A single stilling well includes an inlet 1, a well body 2, a bottom plate 3, and an outlet 4 connected sequentially along the water flow direction. All parts are integrally cast with reinforced concrete.

[0019] Inlet 1 is located on the upper part of the upstream side of the well body. It is a rectangular or circular opening that connects to the upstream water flow channel (such as a drainage ditch, box culvert, or steps) to guide the water flow into the well body.

[0020] Well body 2 is a vertical or inclined cylindrical or box-shaped structure (as shown in Figure 3), forming a hollow cavity inside. The cross-sectional shape of the cavity is rectangular, circular or polygonal, and its height is determined according to the design head, usually 3-5 meters.

[0021] The base plate 3 is horizontally set at the bottom of the well body, with a thickness of 0.5-1 meter. It is used to support the well body structure and guide the water flow to the outlet. A guide channel (not shown) can be set on the base plate to optimize the water flow direction.

[0022] Outlet 4 is located at the bottom of the downstream side of the well body and is connected to the bottom plate. Its cross-sectional shape matches that of the inlet (such as rectangular or circular). The outlet elevation is lower than that of the inlet, forming a water level difference.

[0023] The inlet 1 and outlet 4 are arranged in a staggered manner on the horizontal projection plane (as shown in Figure 1), that is, the center of the inlet and the center of the outlet are not on the same straight line. The staggered distance is determined according to the water flow rate and energy dissipation requirements, usually 1-3 meters, forming a differential structure of "inlet and outlet plane staggered".

[0024] Multiple stilling wells (such as stilling wells A, B, C, D, E, and F, see Figure 1-2) are arranged in a stepped manner from top to bottom along the slope elevation direction. The arrangement of adjacent stilling wells follows the principle of "small spacing and small elevation difference".

[0025] Horizontal spacing: The horizontal projection spacing between adjacent stilling wells is 5-10 meters, which is smaller than the arrangement spacing of conventional energy dissipation structures (the conventional spacing is usually 15-20 meters).

[0026] Vertical elevation difference: The elevation difference between the bottom surfaces of adjacent stilling wells is 3-5 meters, which is smaller than the elevation difference of conventional energy dissipation structures (the conventional elevation difference is usually 8-10 meters).

[0027] Adjacent stilling wells are connected by steps (as shown in Figure 3 and ). Figure 4 As shown, the steps are constructed of reinforced concrete, with one end connecting to the outlet 4 of the upstream stilling well and the other end connecting to the inlet 1 of the downstream stilling well. The slope of the steps is determined according to the geological conditions of the slope, typically 1:2-1:3, to ensure smooth water flow.

[0028] A circumferential drainage ditch (as shown in Figure 2, "Platform Drainage Ditch") is installed around the stilling well to collect groundwater from the slope and direct it downstream, thus preventing groundwater from eroding the foundation of the stilling well. The contact surface between the well body and the slope is coated with an impermeable coating to prevent water from seeping into the foundation.

[0029] This structure is suitable for drainage scenarios in water conservancy and hydropower projects with poor slope geological conditions (such as residual slope soil layers and weathered rock layers) and large water level differences (total drop can reach more than 50 meters), such as spillway slope drainage and reservoir venting pipe slope energy dissipation. Through the differential arrangement of multi-stage stilling wells, the energy of high-speed water flow can be consumed step by step, avoiding the problems of excessive size and insufficient energy dissipation of traditional single-stage energy dissipation structures. At the same time, it reduces the requirements for the geological bearing capacity of the slope and improves the safety and economy of the project.

[0030] This structure utilizes a differential stilling well design, allowing for thorough energy dissipation of water flow as it descends and flows down the slope. The stability of each stilling well is also ensured, reducing the size of structures below the slope and facilitating connection between the downstream and upstream ends of the flow path. The energy dissipation of the differential stilling well structure has two aspects: first, it utilizes its well-like structure to form a small stilling basin, where the flowing water first undergoes vertical tumbling within the stilling well, achieving vertical energy dissipation; second, the staggered inlet and outlet positions of the stilling wells allow for horizontal tumbling within the stilling wells, achieving horizontal energy dissipation. Because the stilling well structure is arranged on the slope with small spacing and minimal elevation difference, each stilling well is relatively small, its stability is easily met, and the water flow can effectively dissipate energy in each stage of the stilling well. Compared to conventional designs, this method effectively dissipates energy at each stage of the slope (stilling well + step). Therefore, when designing the structural dimensions of structures below the slope, the energy dissipation of the water flow does not need to be overly considered, resulting in relatively smaller structural dimensions and eliminating the need for a stilling basin at the end. Because the water flow velocity is controlled, the connection between the end of the flow path and the downstream area is also convenient. This patented structure features a simple design and convenient construction process, solving the problem of energy dissipation in water flow under conditions of large water level differences and poor geological conditions, and can bring considerable economic and social benefits to the project operation.

[0031] It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A differential stilling well structure for use in areas with large water level differences and poor slope geological conditions, characterized in that, It includes an inlet, a well body, a bottom plate, and an outlet connected sequentially along the water flow direction. The well body is a vertical or inclined cylindrical or box-shaped structure. The inlet is connected to the upper part of the well body, and the bottom plate is located at the bottom of the well body and connected to the outlet. The inlet and outlet are staggered on the horizontal projection plane.

2. The differential stilling well structure according to claim 1, characterized in that, The multiple stilling wells are arranged in a stepped manner along the slope elevation direction. The horizontal spacing between adjacent stilling wells is smaller than the arrangement spacing of conventional energy dissipation structures, and the vertical height difference between adjacent stilling wells is smaller than the arrangement height difference of conventional energy dissipation structures.

3. The differential stilling well structure according to claim 2, characterized in that, A step is provided between adjacent stilling wells, with one end of the step connecting to the outlet of the upstream stilling well and the other end connecting to the inlet of the downstream stilling well.

4. The differential stilling well structure according to any one of claims 1-3, characterized in that, The cross-sectional shape of the outlet is rectangular, circular, or other polygonal, and the outlet size matches the inlet size of the downstream connecting structure.

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