A dam back type power plant building foundation gallery anti-seepage drainage structure

Abstract

The utility model provides a dam behind formula power plant building foundation corridor anti -infiltration drainage structure, the anti -infiltration drainage structure is in the predetermined range of structure transverse joint both sides between generator set, and the foundation corridor adopts the prefabricated corridor, the outer surface of prefabricated corridor is laid with a layer of inverted U type's anti -infiltration geomembrane structure that structure transverse joint, and the both ends of anti -infiltration geomembrane structure extend outward and are respectively buried in the peripheral concrete of the adjacent cast -in -situ corridor of prefabricated corridor both sides, the utility model can effectively intercept the possible seepage in structure transverse joint, and the seepage is concentrated and is led to the drainage ditch in the corridor bottom, ensures that there is relatively dry suitable operation, the environment of overhauling in the corridor.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy and hydropower engineering technology, specifically to a seepage prevention and drainage structure for the foundation corridor of a dam-type power plant. Background Technology

[0002] In hydropower projects, the foundation corridor of a power plant downstream of a dam is usually constructed using cast-in-place methods. Waterstops are installed around the perimeter of the corridor at the transverse joints. Due to the complex and numerous waterstop arrangements at the transverse joints of the power plant downstream of the dam, the reinforcing bars around the corridor are cut off by the waterstop plates, requiring the installation of reinforcing bars and stirrups. The overall reinforcement arrangement is dense and complex. In actual construction, the waterstop plates are often damaged due to construction reasons, or the concrete is not poured densely in the later stages, resulting in leakage channels near the waterstop plates. The seepage water eventually seeps into the foundation corridor of the power plant through the structural transverse joints. In some corridors, the seepage volume is large, forming "water curtain caves", which seriously affects the operation and maintenance environment inside the corridor. Measures such as chemical grouting to seal the transverse joints are usually used for sealing, or secondary waterproofing membranes are used to cover and drain the water inside the corridor, or multiple copper waterstop plates are installed around the corridor in the early design stage.

[0003] Because tracing the leakage channels after the project is completed is complex, if the sealing treatment, such as chemical grouting of the transverse joints, is not done properly, the seepage may be forced to the upper operating floors, posing a safety hazard to the power station's operation. At the same time, water stains will appear after local water seepage in the concrete, and the seepage may cause the decoration materials to fall off, affecting the appearance of the power station. If a secondary waterproofing membrane is considered to cover the drainage, the seepage will usually seep into the surrounding concrete, forming water stains. Therefore, this method may require extensive secondary waterproofing, which is costly. If more water-stop copper plates are added to the outside of the corridor for double protection in the early design stage, it will have a greater impact on the on-site steel reinforcement preparation and concrete pouring construction, which may result in poorer concrete pouring quality around the water-stop plates and make it easier for leakage channels to form. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a seepage prevention and drainage structure for the foundation corridor of a dam-type power plant. This invention can effectively intercept and drain potential leakage water from the transverse joints of the structure, concentrating the leakage water and directing it to the drainage ditch at the bottom of the prefabricated corridor, ensuring a relatively dry and suitable operating and maintenance environment within the corridor.

[0005] This utility model provides a seepage prevention and drainage structure for the foundation corridor of a dam-type power plant. The seepage prevention and drainage structure is located within a predetermined range on both sides of the transverse joint between the generator units. The foundation corridor is a prefabricated corridor. The outer surface of the prefabricated corridor is covered with an inverted U-shaped seepage prevention geomembrane structure across the transverse joint of the structure. The two ends of the seepage prevention geomembrane structure extend outward and are respectively embedded in the surrounding concrete of the adjacent cast-in-place corridor on both sides of the prefabricated corridor.

[0006] In one embodiment, the impermeable geomembrane structure includes an intermediate impermeable layer and protective layers on both sides.

[0007] In one embodiment, inside the prefabricated corridor, a water-swellable sealing strip is provided at the transverse joint of the structure on the bottom slab of the prefabricated corridor.

[0008] In one embodiment, drainage ditches are provided on both sides of the bottom slab inside the precast corridor. The drainage ditches are connected to the structural transverse joints at the bottom of the precast corridor in the horizontal direction and to the drainage ditches in the adjacent cast-in-place corridor in the vertical direction.

[0009] In one embodiment, the top of the drainage ditch inside the prefabricated corridor is covered with a cover plate.

[0010] In one embodiment, flexible waterproofing material is provided across the structural transverse joints of the inner surfaces of the side walls and the top arch of the prefabricated corridor.

[0011] The beneficial effects of the seepage prevention and drainage structure for the foundation corridor of a dam-type power plant provided by this utility model are as follows:

[0012] This utility model is applicable to foundation corridors of similar structures in downstream power plants and water conservancy and hydropower projects, and is particularly suitable for seepage prevention and drainage construction at structural transverse joints, possessing good adaptability and promotional value. By setting prefabricated corridors on both sides of the structural transverse joints, and combining them with impermeable geomembranes, water-stopping materials, and drainage systems, a highly efficient seepage prevention and drainage system can be formed.

[0013] This structure can effectively intercept water leakage at the horizontal joints of the structure and guide it to the drainage ditch at the bottom of the prefabricated corridor for rapid discharge. This ensures that the interior of the corridor maintains a relatively dry operating and maintenance environment, prevents water leakage from polluting the internal structural surface, and maintains the overall aesthetics.

[0014] This utility model adopts a combination of blocking and dredging. In the event that the water-stopping plate sealing solution fails, drainage measures are added to guide the seepage water out through the drainage ditch. This avoids the possibility that secondary sealing solutions such as chemical grouting may force the seepage water into the upper operating layer of the plant, or that adding water-stopping plates in the early stage may affect the construction and make the leakage channel more likely to form. Compared with the later full-section waterproof membrane sealing solution in the corridor, the amount of engineering work is less.

[0015] This utility model has a simple structure, mature construction method, and flexible layout of prefabricated corridors, which can effectively improve on-site construction efficiency and accelerate the construction progress of the main concrete of the power station. At the same time, the structure has low investment cost, high construction reliability, and has significant economic and practical advantages. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A typical longitudinal section schematic diagram of the seepage prevention and drainage structure of the foundation corridor of the dam-type power plant provided in the embodiment of this utility model;

[0018] Figure 2 A typical cross-sectional schematic diagram of the seepage prevention and drainage structure of the foundation corridor of the downstream power plant provided in this embodiment of the utility model.

[0019] Attached reference numerals: 1-Precast gallery; 2-Cast-in-place gallery; 3-Structural transverse joint; 4-Waterstop; 5-Imperible geomembrane structure; 6-Drainage ditch; 7-Flexible waterstop material; 8-Cover plate; 9-Water-swellable waterstop strip. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present utility model. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present utility model.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0022] like Figures 1 to 2 As shown, a seepage prevention and drainage structure for the foundation corridor of a dam-type power plant is provided. The seepage prevention and drainage structure is located within a predetermined range on both sides of the structural transverse joint 3 between the generator units. The foundation corridor is a precast corridor 1. The outer surface of the precast corridor 1 is covered with an inverted U-shaped seepage prevention geomembrane structure 5 that spans the structural transverse joint 3. The two ends of the seepage prevention geomembrane structure 5 extend outward and are respectively embedded in the surrounding concrete of the cast-in-place corridor 2 adjacent to the precast corridor 1.

[0023] In this embodiment, a prefabricated corridor 1 is used on both sides of the structural transverse joint 3 within a range of not less than 1m to provide support for the laying of the impermeable geomembrane structure 5, and the thickness of the prefabricated corridor structure does not exceed 30cm.

[0024] The impermeable geomembrane structure 5 includes an intermediate impermeable layer and protective layers on both sides. In this embodiment, the intermediate impermeable layer is a plastic film, and the protective layers on both sides are geotextiles. The impermeable geomembrane structure 5 is laid close to the outer surface of the precast corridor 1. The two ends of the impermeable geomembrane structure 5 extend outward and are respectively buried in the surrounding concrete of the adjacent cast-in-place corridors 2 on both sides of the precast corridor 1, with a length of not less than 50cm.

[0025] Inside the prefabricated corridor 1, a water-swellable sealing strip 9 is provided at the structural transverse joint 3 of the bottom plate of the prefabricated corridor 1.

[0026] Drainage ditches 6 are provided on both sides of the inner bottom slab of the precast corridor 1. The drainage ditches 6 are connected to the structural transverse joints 3 at the bottom of the precast corridor 1 in the horizontal direction and to the drainage ditches in the adjacent cast-in-place corridor 2 in the longitudinal direction. If the external waterstop 4 of the precast corridor 1 is damaged or the concrete is not poured densely, resulting in a seepage channel and water seepage, the seepage water will be discharged downward along the impermeable geomembrane structure 5 on the outside of the structural transverse joint 3 to the structural transverse joint 3 at the bottom of the precast corridor 1. Then, through the obstruction of the water-swellable waterstop strip 9 and the flexible waterstop material 7, the seepage water will be discharged to the drainage ditches 6 on both sides of the bottom of the precast corridor 1, preventing the seepage water from flowing directly out from the top of the precast corridor 1.

[0027] The top of the drainage ditch 6 inside the prefabricated corridor 1 is covered with a cover plate 8 to prevent water from spraying into the corridor when the seepage pressure at the horizontal joint is too high.

[0028] Flexible water-stopping material 7 is installed across the structural transverse joints 3 on the inner surfaces of the side walls and the inner surface of the arch of the prefabricated corridor 1 to further ensure that seepage water exits from the drainage ditch of the prefabricated corridor 1. In this embodiment, the flexible water-stopping material 7 is a 1.5mm EVA composite waterproof board.

[0029] This utility model utilizes a prefabricated corridor 1 as a supporting structure. An impermeable geomembrane structure 5 is added at the transverse joint 3 of the structure. If there is a seepage channel around the corridor, it can be blocked in advance by the impermeable geomembrane structure 5 to prevent water from seeping out of the inner surface of the corridor and forming water stains. Combined with the transverse joint structure to provide a drainage path, the seepage water can be drained to the drainage ditch 6 at the bottom of the prefabricated corridor 1. This simplifies the solution of setting multiple external water-stop plates to ensure the water-stopping effect and makes construction more convenient. Therefore, this utility model structure was designed.

[0030] Based on the description and drawings of this utility model, those skilled in the art can easily manufacture or use the seepage prevention and drainage structure of the foundation corridor of the downstream power plant of this utility model, and can produce the positive effects described in this utility model.

[0031] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0032] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model 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 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.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A seepage prevention and drainage structure for the foundation corridor of a dam-type power plant, characterized in that: Within a range of no less than 1m on both sides of the transverse joint between the generator sets, the foundation corridor adopts a precast corridor; the outer surface of the precast corridor is covered with an inverted U-shaped impermeable geomembrane structure across the transverse joint of the structure, and the two ends of the impermeable geomembrane structure extend outward and are respectively embedded in the surrounding concrete of the adjacent cast-in-place corridor on both sides of the precast corridor.

2. The seepage prevention and drainage structure of the foundation corridor of the downstream power plant as described in claim 1, characterized in that: The impermeable geomembrane structure includes an intermediate impermeable layer and protective layers on both sides.

3. The seepage prevention and drainage structure of the foundation corridor of the downstream power plant as described in claim 1, characterized in that: Inside the prefabricated corridor, a water-swellable sealing strip is installed at the transverse joint of the structure on the bottom slab of the prefabricated corridor.

4. The seepage prevention and drainage structure of the foundation corridor of the downstream power plant as described in claim 1, characterized in that: The precast gallery has drainage ditches on both sides of the inner bottom slab. The drainage ditches are connected to the structural transverse joints at the bottom of the precast gallery in the horizontal direction and to the drainage ditches in the adjacent cast-in-place gallery in the vertical direction.

5. The seepage prevention and drainage structure of the foundation corridor of the downstream power plant as described in claim 4, characterized in that: The top of the drainage ditch inside the prefabricated corridor is covered with a cover plate.

6. The seepage prevention and drainage structure of the foundation corridor of the downstream power plant as described in claim 1, characterized in that: Flexible water-stopping material is installed across the structural joints on the inner surfaces of the side walls and the top arch of the prefabricated corridor.

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