A structure of a drainage pump station outlet pool foundation pit fat groove backfill combined with a diaphragm wall

Abstract

The utility model discloses a structure that drainage pump station outlet pool foundation pit fertilizer groove backfill and diaphragm wall are combined, including outlet pool and diaphragm wall, the fertilizer groove is formed between the outlet pool and diaphragm wall, the inside filling solidified soil of fertilizer groove is provided with the flood control wall at the top of diaphragm wall and solidified soil, the side of outlet pool outer wall is close to solidified soil and is provided with the foam board, and the waterstop is set to the junction part of outlet pool side wall and solidified soil. The utility model solves the defect that cement soil mixing pile diaphragm wall and outlet pool pool wall are difficult to be connected into a whole effectively in the prior art, and the structure of the utility model forms complete and reliable anti -infiltration system, and the anti -infiltration performance and safety stability of project are improved.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit construction and seepage prevention technology in water conservancy projects, specifically to a structure that combines backfilling of the foundation pit of a drainage pumping station outlet pool with a seepage prevention wall. Background Technology

[0002] Pumping stations are common irrigation and drainage structures in water conservancy projects, playing a vital role in water resource regulation. Drainage pumping stations, in particular, are crucial in addressing regional flooding, serving as essential facilities to protect areas from flooding disasters. Within the safety zone of flood storage and detention areas, drainage pumping stations are the only channel for draining rainwater and floodwater from the area to the outside, making them irreplaceable in ensuring drainage safety within the safety zone and protecting the lives and property of the people.

[0003] The outlet pool of a drainage pumping station in a water conservancy project is generally located inside the dike. Floodwater is discharged into the river through a culvert downstream of the outlet pool. When land use is limited, the pumping station's outlet pool is connected to a flood control wall to jointly resist river floods. Due to the functional requirements of the project, a complete and reliable seepage prevention system is needed to prevent water from seeping through the connection between the outlet pool and the flood control wall, as well as the foundation, thus avoiding seepage damage.

[0004] Flood control wall foundations typically employ cement-soil mixing piles as seepage barriers to increase seepage paths and prevent foundation damage from seepage. During the construction of pump station outlet pools, the excavated trenches require backfilling, but traditional backfill materials such as sand, gravel, and lime-soil lack seepage-proof properties. Furthermore, the cement-soil mixing pile seepage barrier foundation is difficult to effectively connect with the pool wall, hindering the combined seepage prevention function and severely impacting the overall seepage control performance and safety stability of the project.

[0005] Since the pump station's outlet pool and flood control wall are connected and need to work together to resist river floods, a complete and reliable seepage prevention system is required to prevent flood infiltration. Traditional backfill materials lack seepage prevention properties. The seepage prevention wall and the outlet pool wall cannot be effectively combined to form an integrated seepage prevention structure. Utility Model Content

[0006] To address the shortcomings of existing technologies where cement-soil mixing pile anti-seepage walls and outlet pool walls are difficult to effectively connect into a whole, this utility model provides a structure that combines backfilling of the drainage pump station outlet pool foundation pit with an anti-seepage wall, thereby forming a complete and reliable anti-seepage system and improving the anti-seepage performance and safety stability of the project.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] A structure combining backfilling of a drainage pumping station outlet pit with a seepage barrier wall includes an outlet pit and a seepage barrier wall. A trough is formed between the outlet pit and the seepage barrier wall. The trough is filled with solidified soil. A flood control wall is installed on top of the seepage barrier wall and the solidified soil. A foam board is installed on the outer wall of the outlet pit near the seepage barrier wall. Waterstops are installed at the connection points between the side wall of the outlet pit and the solidified soil or the flood control wall.

[0009] Preferably, the impermeable wall and the solidified soil are located below ground level, while the flood control wall is located above ground level.

[0010] Preferably, the foam board is made of closed-cell polyethylene foam board.

[0011] Preferably, the waterstop is a copper sheet in a W-shape, and the waterstop is vertically fixed to the side wall of the outlet pool and the solidified soil or flood control wall.

[0012] Preferably, a keyway is provided at the end of the seepage barrier wall, and the keyway has a trapezoidal cross section to ensure that the liquid solidified soil penetrates deep into the keyway.

[0013] Preferably, the seepage barrier wall is in the form of cement-soil mixing piles.

[0014] The beneficial effects of this utility model are:

[0015] This invention utilizes solidified soil, which possesses excellent seepage prevention properties, solving the problem of traditional backfill materials lacking such properties. The solidified soil exhibits good fluidity and self-compacting properties, allowing it to fully contact and tightly bond with the cement-soil mixing pile seepage barrier wall and the outlet pool wall during backfilling, forming a complete seepage prevention system and significantly improving the project's seepage prevention performance. This invention is also convenient to construct, employing pumping for backfilling, resulting in high construction efficiency and eliminating the need for complex construction equipment, thus shortening the project duration and reducing construction costs. Attached Figure Description

[0016] Figure 1 This is a transverse cross-sectional view of the underground part of the drainage pump station outlet pool foundation pit backfill and seepage prevention wall as described in this utility model.

[0017] Figure 2 This is a transverse cross-sectional view of the above-ground portion of the drainage pump station outlet pool foundation pit backfill and anti-seepage wall as described in this utility model.

[0018] Figure 3 This is a longitudinal cross-sectional view of the combination of backfilling and anti-seepage wall in the foundation pit of the drainage pumping station of this utility model.

[0019] Figure 4 This is a longitudinal cross-sectional view of the backfill trench in front of the drainage pump station outlet pool foundation pit, which combines backfilling with the anti-seepage wall, as described in this utility model.

[0020] Attached reference numerals: 1-Outlet pool, 2-Temporary support, 3-Fertilizer tank, 4-Flood control wall, 5-Imperible wall, 6-Solidified soil, 7-Water stop, 8-Foam board, 9-Keyway. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, the embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solution of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0022] like Figures 1-4 As shown, a structure combining backfilling of a drainage pumping station outlet pit with an anti-seepage wall is disclosed. The structure includes an outlet pit 1 and an anti-seepage wall 5. The anti-seepage wall 5 is constructed using cement-soil mixing piles. A trench 3 is formed between the outlet pit 1 and the anti-seepage wall 5. A keyway 9 with a trapezoidal cross-section is provided at the end of the anti-seepage wall 5. The trench 3 is filled with solidified soil 6, ensuring that the liquid solidified soil 6 penetrates deep into the keyway 9. A flood control wall 4 is installed on top of the anti-seepage wall 5 and the solidified soil 6. The anti-seepage wall 5 and the solidified soil 6 are located below ground level, while the flood control wall 4 is located above ground level. A foam board 8 is installed on the outer wall of the outlet pit 1 near the solidified soil 6. A waterstop 7, made of copper sheet in a W-shape, is installed at the connection between the side wall of the outlet pit 1 and the solidified soil 6 or the flood control wall 4. The waterstop 7 is vertically fixed to the side wall of the outlet pit 1 and the solidified soil 6. A foam board 8 is provided on the outer wall of the water outlet pool 1 near the solidified soil 6. The foam board 8 is made of closed-cell polyethylene foam plastic board.

[0023] The following description uses a specific drainage pumping station as an example to illustrate the features of this utility model. However, all descriptions are for illustrative purposes only and should not be construed as limiting the scope of this utility model in any way.

[0024] like Figures 1-4 As shown, a drainage pumping station project within the safety zone of a flood detention area, due to land constraints, requires connecting the pumping station's outlet pool to the flood control wall to jointly resist river floods, and a complete and reliable seepage prevention system must be formed to prevent leakage and seepage damage. The specific implementation steps are as follows.

[0025] (1) First, temporary support 2 for the foundation pit is carried out, using steel sheet pile support. Then, the foundation pit is excavated. In practical applications, the excavation depth is determined according to the location of the water outlet pool. In the preferred embodiment, the excavation depth H is 13m. Next, the reinforcement is tied and the formwork is installed. Waterstop 7 is installed at the connection between the side wall of the water outlet pool 1 and the flood control wall 4 or the solidified soil 6.

[0026] The waterstop 7 is a W-shaped copper sheet with a thickness t1 of 0.8 mm and a width b of 42 cm. Concrete pouring and curing are then carried out.

[0027] To prevent the liquid solidified soil from adhering to the side wall of the outlet pool 1, which would cause changes in the stress on the outlet pool 1 and affect its structural safety, foam board 8 is pasted on the outer side wall of the outlet pool 1.

[0028] The foam board 8 is a closed-cell polyethylene foam board with a thickness t2 of 2cm. After construction, a trough 3 is formed around the water outlet pool 1.

[0029] (2) Construct the seepage prevention wall 5 on the outside of the temporary support 2.

[0030] The seepage barrier 5 adopts the form of cement-soil mixing piles. The cement content of the mixing piles is 15%, the pile diameter is 0.6m, the pile spacing is 0.4m, the minimum thickness of the sleeve part is 0.4m, and the seepage barrier 5 is adjacent to the outer edge of the temporary support 2.

[0031] (3) Clean the fertilizer tank 3, removing debris, loose soil and water to ensure that the inside of the fertilizer tank 3 is clean and free of debris. Remove the temporary support 2, remove the soil outside the vertical support to expose the seepage prevention wall 5 of the cement-soil mixing pile, roughen the end of the seepage prevention wall 5 of the cement-soil mixing pile, and set the keyway 9 to ensure that the liquid solidified soil and the seepage prevention wall 5 of the cement-soil mixing pile can be well bonded.

[0032] The keyway 9 has a trapezoidal cross-section with a depth d of 10cm, an upper opening width b1 of 20cm, and a lower opening width b2 of 10cm.

[0033] (4) Prepare mud slurry using the soil excavated from the engineering foundation pit, and control the mud slurry unit weight to be not less than 13 kN / m³. 3 The curing agent is mixed with the mud to prepare liquid solidified soil, and the mixing time is not less than 5 minutes. The density after solidification is controlled to be no more than 19 kN / m³. 3 The curing agent includes an activator, cement, and mineral powder, and the mass ratio of the activator, cement, and mineral powder is 1:1:3; the mass content of the curing agent in the liquid solidified soil is between 10% and 15%.

[0034] The prepared liquid solidified soil is injected into fertilizer tank 3 using a pumping device. During the injection of liquid solidified soil, the backfilling in fertilizer tank 3 is ensured to rise synchronously to prevent uneven backfilling heights from causing movement and deformation of the effluent pool 1. The backfilling height difference is no greater than 0.5m. To prevent the effluent pool 1 from floating, the backfilling is carried out in layers, with each layer controlled to a thickness of 1-2m.

[0035] The pumping distance of the mud should not exceed 300m, the gravity flow distance should not exceed 30m, the drop height at the pump outlet should not exceed 1m, and the time from mixing the solidified material to completing the pouring should not exceed 4 hours.

[0036] (5) Five hours after the backfilling is completed, cover the top surface with soil and water for curing. The curing period is 7 days. After curing, the quality inspection of the backfill of the fertilizer trench 3 shall be carried out in accordance with the specifications and standards for anti-seepage walls.

[0037] (6) After the liquid solidified soil is cured, it becomes solidified soil 6. The top of solidified soil 6 and the anti-seepage wall 5 are connected to the foundation of the flood control wall 4 to increase the foundation seepage path.

[0038] The overall seepage prevention system formed by this project has a permeability coefficient of less than 1×10⁻⁶. -7 The flow rate (cm / s) meets design requirements. The copper waterstop 7 effectively connects the liquefied solidified soil to the effluent pool 1, blocking the leakage path at their junction. The liquefied solidified soil and the anti-seepage wall 5 of the cement-soil mixing pile are tightly bonded, with no leakage observed, effectively ensuring the safety and stability of the project.

[0039] In this embodiment, an innovative method was used to prepare liquid solidified soil by mixing excavated soil with a solidifying agent, reducing the cost of transporting excavated soil. The liquid solidified soil has high fluidity, effectively filling and compacting the fertilizer tank 3 area. By attaching closed-cell polyethylene foam boards to the sidewalls of the effluent tank 1, the structure of the effluent tank 1 is effectively separated from the backfill structure, preventing stress changes in the effluent tank 1. The copper waterstop 7 effectively blocks seepage between the liquid solidified soil and the structural joints of the sidewalls of the effluent tank 1. Roughening the cement-soil mixing piles and setting keyways 9 achieves an effective combination of the fertilizer tank 3 backfill and the anti-seepage wall 5, forming a complete and reliable anti-seepage system, significantly improving the project's anti-seepage performance and safety stability.

[0040] The above description is only used to detail the specific embodiments of this utility model, but the technical solution proposed by this utility model is not limited to the above methods. All equivalent modifications and variations made by those skilled in the art to the technology proposed by this utility model without departing from the basic principles of this technology should be covered within the scope of the claims of this utility model.

Claims

1. A drainage pump station water outlet pool foundation pit fat groove backfill and anti-seepage wall combined structure, characterized in that, It includes an outlet pool (1) and a seepage barrier wall (5), a fertilizer trough (3) is formed between the outlet pool (1) and the seepage barrier wall (5), the fertilizer trough (3) is filled with solidified soil (6), a flood control wall (4) is provided on the top of the seepage barrier wall (5) and the solidified soil (6), a foam board (8) is provided on the side of the outer wall of the outlet pool (1) near the solidified soil (6), and a water stop (7) is provided at the connection between the side wall of the outlet pool (1) and the solidified soil (6) or the flood control wall (4).

2. The drainage pumping station water outlet pool foundation pit fat groove backfill and anti-seepage wall combined structure according to claim 1, characterized in that, The seepage barrier (5) and the solidified soil (6) are located below ground level, while the flood control wall (4) is located above ground level.

3. The structure of the foundation pit of the outlet pool of the drainage pumping station, fat groove backfill and anti-seepage wall combination according to claim 1, characterized in that, The foam board (8) is made of closed-cell polyethylene foam board.

4. The sump foundation trench backfill combined with anti-seepage wall structure of a drainage pump station water outlet pool according to claim 1, characterized in that, The waterstop (7) is a copper sheet in the shape of a W. The waterstop (7) is vertically fixed to the side wall of the outlet pool (1) and the solidified soil (6) or the flood control wall (4).

5. The sump foundation trench backfill combined with anti-seepage wall structure of a drainage pump station water outlet pool according to claim 1, characterized in that, A keyway (9) is provided at the end of the seepage barrier (5). The keyway (9) adopts a trapezoidal cross section to ensure that the liquid solidified soil (6) penetrates into the keyway (9).

6. The sump foundation trench backfill combined with anti-seepage wall structure of a drainage pump station water outlet pool according to claim 1, characterized in that, The seepage prevention wall (5) is in the form of cement-soil mixing piles.

Images