Lateral water inlet / outlet arrangement type of pumped storage power station on deep covering layer
By adopting a combination of slope sections and foundation structures on a thick overburden layer, combined with concrete raft slabs and cast-in-place pile structures, the problem of insufficient foundation bearing capacity was solved, the stability and safety of the side inlet/outlet of the pumped storage power station were achieved, the amount of engineering work was reduced, and a new design concept was provided.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA BEIJING ENG CORP
- Filing Date
- 2025-05-07
- Publication Date
- 2026-04-17
AI Technical Summary
How to improve the bearing capacity of the foundation of the side inlet/outlet of a pumped storage power station on a thick overburden layer, ensure structural stability, and avoid uneven settlement affecting safety.
The structure adopts a combination of slope section, inlet/outlet structure and foundation structure, including concrete raft slab structure, foundation concrete and cast-in-place pile structure under slab, which are combined into a whole. The slope section is reinforced by stable slope and fully weathered vertical slope. The cast-in-place pile structure under slab is arranged below gate well and trash rack section to reduce the amount of excavation and replacement concrete work.
It improves the bearing capacity of the foundation, ensures the overall stability of the inlet/outlet structure, reduces the amount of excavation and concrete replacement work, provides a new layout to adapt to deep overburden conditions, and ensures the safety and stability of the project.
Smart Images
Figure CN224133676U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an arrangement of inlet / outlet water, specifically to an arrangement of side-type inlet / outlet water inlet for a pumped storage power station on a thick overburden layer. Background Technology
[0002] Pumped storage power stations, as a relatively mature form of energy storage, have seen rapid expansion in construction scale. The inlet and outlet are components of the water conveyance system of a pumped storage power station. Currently, the site selection for the inlet and outlet of pumped storage power stations generally avoids soft strata to prevent the adverse effects of insufficient foundation bearing capacity on the overall stability of the inlet and outlet. However, due to the special and complex nature of the terrain and geological conditions, as well as the overall layout, for side-mounted inlets and outlets of pumped storage power stations that can only be located on thick overburden layers, how to improve the foundation bearing capacity and ensure structural stability to enable side-mounted inlets and outlets to adapt to the conditions of thick overburden layers is a key issue that needs to be addressed. Utility Model Content
[0003] To address the shortcomings of existing technologies, this utility model provides an arrangement of side-type inlet / outlet ports for pumped storage power stations on thick overburden layers. This arrangement is applicable to thick overburden layers and can ensure the overall stability of the side-type inlet / outlet structure of pumped storage power stations and avoid uneven settlement that could affect safety.
[0004] The technical solution adopted in this utility model is as follows:
[0005] This utility model provides an arrangement of the side inlet / outlet of a pumped storage power station on a thick overburden layer, including: a slope section, the main structure of the inlet / outlet and the foundation structure;
[0006] The slope section is arranged on the upstream side of the main body of the inlet / outlet structure; the foundation structure is arranged at the lower part of the main body of the inlet / outlet structure; wherein, the main body of the inlet / outlet structure includes a gate well structure (7), a diffusion section (8), an adjustment section (9) and a trash rack section (10) arranged sequentially from upstream to downstream; the foundation structure includes a concrete raft structure (1), foundation concrete (2) and a slab-mounted pile structure (3); the foundation concrete (2) is laid at the bottom of the main body of the inlet / outlet structure, and the concrete raft structure (1) is laid at the bottom of the foundation concrete (2); the slab-mounted pile structure (3) is arranged at the bottom of the concrete raft structure (1) and at the two ends of the main body of the inlet / outlet structure; the concrete raft structure (1), the foundation concrete (2) and the slab-mounted pile structure (3) are combined into a whole.
[0007] Preferably, the under-slab cast-in-place pile structure (3) is arranged below the foundation surface of the gate well structure (7) and the trash rack section (10).
[0008] Preferably, the under-slab grouting pile structure (3) is evenly arranged at certain intervals within the influence range of the gate well structure (7), the adjustment section (9), and the trash rack section (10) above it.
[0009] Preferably, the concrete thickness of the concrete raft structure (1) is 15cm to 50cm.
[0010] Preferably, the slope section includes a concrete-filled slope protection pile structure (4), a stable slope (5), and a fully weathered vertical slope (6);
[0011] The stable slope (5) is arranged on the upstream side of the main body of the inlet / outlet structure, and the slope of the stable slope (5) gradually decreases from upstream to downstream; the bottom of the stable slope (5) is provided with the fully weathered vertical slope (6); a row of concrete-filled slope protection piles (4) are arranged in the direction of the boundary between the stable slope (5) and the fully weathered vertical slope (6).
[0012] Preferably, the slope ratio of the stable slope (5) is between 1:2.5 and 1:3.
[0013] The side-type inlet / outlet arrangement of a pumped storage power station on a thick overburden layer provided by this utility model has the following advantages:
[0014] This utility model provides a side-mounted inlet / outlet arrangement for a pumped storage power station on a thick overburden layer. It solves the engineering problems caused by insufficient foundation bearing capacity and uneven settlement in thick overburden layers, reduces the amount of excavation and concrete replacement work, and ensures the safety and stability of the excavation slope and the overall structure of the inlet / outlet. It provides a new arrangement for the side-mounted inlet / outlet of a pumped storage power station on a thick overburden layer, and provides a new design concept for similar projects. It has certain application value. Attached Figure Description
[0015] Figure 1 This utility model provides a structural layout diagram of a side-type inlet / outlet arrangement for a pumped storage power station with a thick overburden layer.
[0016] Wherein: 1—concrete raft structure; 2—foundation concrete; 3—under-slab cast-in-place pile structure; 4—concrete cast-in-place slope protection pile structure; 5—stabilized slope; 6—fully weathered vertical slope; 7—gate well structure; 8—diffusion section; 9—adjustment section; 10—trash rack section. Detailed Implementation
[0017] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0018] This utility model provides a side-mounted inlet / outlet arrangement for a pumped storage power station on a thick overburden layer. It solves the engineering problems caused by insufficient foundation bearing capacity and uneven settlement in thick overburden layers, reduces the amount of excavation and concrete replacement work, and ensures the safety and stability of the excavation slope and the overall structure of the inlet / outlet. It provides a new arrangement for the side-mounted inlet / outlet of a pumped storage power station on a thick overburden layer, and provides a new design concept for similar projects. It has certain application value.
[0019] See Figure 1 This utility model provides an arrangement of the side inlet / outlet of a pumped storage power station on a thick overburden layer. It is particularly suitable for situations where the side inlet / outlet of a pumped storage power station can only be arranged on a thick overburden layer due to the special and complex nature of the terrain and geological conditions and the influence of the overall layout. The arrangement includes: slope section, main structure of inlet / outlet and foundation structure.
[0020] A slope section is arranged on the upstream side of the main inlet / outlet structure; a foundation structure is arranged at the bottom of the main inlet / outlet structure; the main inlet / outlet structure includes a gate well structure 7, a diffuser section 8, an adjustment section 9, and a trash rack section 10 arranged sequentially from upstream to downstream; the gate well structure 7 is located on the upstream or downstream side of the inlet / outlet structure; the foundation structure includes a concrete raft slab structure 1, foundation concrete 2, and cast-in-place pile structure 3; foundation concrete 2 is laid at the bottom of the main inlet / outlet structure, and concrete raft slab structure 1 is laid at the bottom of foundation concrete 2; cast-in-place pile structure 3 is arranged at the bottom of concrete raft slab structure 1, corresponding to both ends of the main inlet / outlet structure; concrete raft slab structure 1, foundation concrete 2, and cast-in-place pile structure 3 are integrated into a whole. The cast-in-place pile structure 3 is located below the foundation surface of gate well structure 7 and trash rack section 10. Specifically, the cast-in-place piles 3 are evenly distributed at certain intervals within the influence range of the gate well structure 7, the adjustment section 9, and the trash rack section 10 above them. The concrete thickness of the concrete raft structure 1 is 15cm to 50cm.
[0021] The slope section includes a concrete-filled retaining pile structure 4, a stable slope 5, and a fully weathered vertical slope 6;
[0022] The stable slope 5 is located on the upstream side of the main inlet / outlet structure, and its slope gradually decreases from upstream to downstream; the slope ratio of the stable slope 5 is between 1:2.5 and 1:3. A fully weathered vertical slope 6 is set at the bottom of the stable slope 5; a row of concrete-filled retaining pile structures 4 is arranged at the boundary between the stable slope 5 and the fully weathered vertical slope 6.
[0023] This utility model provides an arrangement of side-type inlet / outlet for a pumped storage power station on a thick overburden layer, which has the following design features:
[0024] 1. The foundation structure consists of, from top to bottom, foundation concrete 2, concrete raft slab structure 1, and cast-in-place pile structure 3. The cast-in-place pile structure 3 is located below the foundation surface of gate well structure 7 and trash rack section 10. The concrete raft slab structure 1, the cast-in-place pile structure 3, and the foundation concrete 2 are integrated into a whole.
[0025] 2. The slope sections, from highest to lowest, are: stable slope 5, fully weathered vertical slope 6, and concrete-filled retaining pile structure 4. The stable slope 5 has a gentle slope with a slope ratio between 1:2.5 and 1:3, and the slope is relatively stable. The fully weathered vertical slope 6 has a very large slope and poor geological conditions, making it prone to slope slippage and instability. Therefore, the fully weathered vertical slope 6 is reinforced with concrete-filled retaining pile structure 4.
[0026] According to general practice, when the inlet / outlet is located on a thick overburden layer, the slope ratio of the excavation side needs to be reduced and the foundation needs to be replaced with concrete. This results in an increase in the amount of concrete excavation and replacement, a larger land area, and adverse effects on the ecological environment and construction period, thus limiting the choice of inlet / outlet layout for pumped storage power stations.
[0027] This utility model differs from the typical arrangement of side-type inlet / outlet for pumped storage power stations on thick overburden layers. Instead of excessively slowing down the excavation slope ratio of the stable slope, it sets up a fully weathered vertical slope at the bottom of the stable slope and reinforces the support with a concrete-filled slope protection pile structure. This reduces the amount of excavation work, ensures slope stability, and effectively solves the problem of excessive excavation and replacement concrete volume when arranging inlets and outlets on thick overburden layers.
[0028] In this invention, a slab-supported pile structure is arranged below the gate well structure and the trash rack section, and a concrete raft slab structure is poured above the slab-supported pile structure. The concrete raft slab structure is integrated with the slab-supported pile structure and the foundation concrete as a whole, which improves the bearing capacity of the foundation and solves the engineering problem caused by insufficient bearing capacity of the deep overburden foundation.
[0029] The following is a detailed description of a large-scale project that adopted the technical solution of this utility model, with reference to the accompanying drawings: The side inlet / outlet of the reservoir of a certain project is arranged on a thick overburden layer. The bearing capacity of the foundation at the trash rack section and gate well structure of the inlet / outlet is insufficient. According to the general arrangement, the amount of concrete to be excavated and replaced is too large, and there is a risk of instability of the inlet / outlet structure.
[0030] Therefore, the side-type inlet / outlet arrangement of this utility model is adopted, such as... Figure 1 As shown, a cast-in-place pile structure 3 is arranged below the gate well structure 7 and the trash rack section 10. The cast-in-place pile structure 3 at the gate well structure 7 has a pile diameter of 1.2m, a pile length of 35m, and a row spacing of 3m; the cast-in-place pile structure 3 at the trash rack section 10 has a pile diameter of 1.2m, a pile length of 15m, and a row spacing of 5m. A 50cm thick concrete raft slab structure 1 is poured on top of the cast-in-place pile structure 3 and is integrated with the cast-in-place pile structure 3 and the foundation concrete 2 to ensure the bearing capacity requirements of the foundation.
[0031] The main structure of the inlet / outlet is arranged from upstream to downstream as follows: gate well structure 7, diffuser section 8, adjustment section 9, and trash rack section 10. The upstream stable slope 5 of the inlet / outlet has an excavation slope ratio of 1:1.25. The fully weathered vertical slope 6 is reinforced with concrete-filled slope protection pile structure 4, with a pile diameter of 1.2m and a pile length of 25m.
[0032] The conventional foundation replacement concrete method is generally suitable for foundation treatment of shallow soft soil layers or uneven soil layers. When the thickness of the strongly weathered layer is greater than 30m, the average reaction force and the maximum reaction force increase with the increase of the replacement concrete thickness. The simple replacement concrete foundation cannot meet the bearing capacity requirements of the foundation. Therefore, this utility model can meet the arrangement of the side inlet / outlet of the pumped storage power station on the thick overburden layer, ensuring the overall safety and stability of the inlet / outlet structure. It provides a new arrangement type for the side inlet / outlet of the pumped storage power station on the thick overburden layer, provides a new idea for similar projects, and has certain promotion and application value.
[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. An arrangement of side-type water intake / outlet for pumped storage power station on deep overburden, characterized in that, include: Slope section, inlet / outlet structure and foundation structure; The slope section is arranged on the upstream side of the main inlet / outlet structure; The foundation structure is arranged at the lower part of the main body of the inlet / outlet structure; wherein, the main body of the inlet / outlet structure includes a gate well structure (7), a diffusion section (8), an adjustment section (9) and a trash rack section (10) arranged sequentially from upstream to downstream; the foundation structure includes a concrete raft structure (1), foundation concrete (2) and a slab-mounted pile structure (3); the foundation concrete (2) is laid at the bottom of the main body of the inlet / outlet structure, and the concrete raft structure (1) is laid at the bottom of the foundation concrete (2); the slab-mounted pile structure (3) is arranged at the bottom of the concrete raft structure (1) and at the two ends of the main body of the inlet / outlet structure; the concrete raft structure (1), the foundation concrete (2) and the slab-mounted pile structure (3) are combined into a whole.
2. The layout of the side-type water inlet / outlet of the pumped storage power station on deep overburden layer according to claim 1, characterized in that, The slab-mounted pile structure (3) is arranged below the foundation surface of the gate well structure (7) and the trash rack section (10).
3. The layout of the side-type water inlet / outlet of the pumped storage power station on deep overburden layer according to claim 1, characterized in that, The under-slab cast-in-place pile structure (3) is evenly arranged at certain intervals within the influence range of the gate well structure (7), the adjustment section (9), and the trash rack section (10) above it.
4. The layout of the side-type water inlet / outlet of the pumped storage power station on deep overburden layer according to claim 1, characterized in that, The concrete thickness of the concrete raft structure (1) is 15cm to 50cm.
5. The layout of the side-type water inlet / outlet of the pumped storage power station on deep overburden layer according to claim 1, characterized in that, The slope section includes a concrete-filled slope protection pile structure (4), a stable slope (5), and a fully weathered vertical slope (6); The stable slope (5) is arranged on the upstream side of the main body of the inlet / outlet structure, and the slope of the stable slope (5) gradually decreases from upstream to downstream; the bottom of the stable slope (5) is provided with the fully weathered vertical slope (6); a row of concrete-filled slope protection piles (4) are arranged in the direction of the boundary between the stable slope (5) and the fully weathered vertical slope (6).
6. The arrangement of the side type water inlet / outlet of the pumped storage power station on deep overburden layer according to claim 5, characterized in that, The slope ratio of the stable slope (5) is between 1:2.5 and 1:3.