Underground water interception system for high underground water level area

Abstract

The utility model discloses an underground water interception system for a high underground water level area, which comprises a concrete cushion layer arranged at the lower part of a structural bottom plate and provided with an extension section upwards along a foundation pit slope; the waterproof clay is located between the foundation pit slope and the structural outer wall, and a plain concrete coping is arranged at the top of the waterproof clay; the waterproof interlayer is arranged on the side, close to the waterproof clay, of the structural bottom plate and the structural outer wall in a full-length mode, one part of the waterproof interlayer is arranged between the concrete cushion layer and the structural bottom plate, the other part of the waterproof interlayer is arranged on the outer side of the structural outer wall, and a horizontal construction joint is reserved in the position, above the structural bottom plate, of the structural outer wall; the water stop steel plate is vertically arranged in the structural outer wall at the horizontal construction joint; the plastic water pipe is vertically arranged in the waterproof clay and the plain concrete coping, the lower end of the plastic water pipe extends into the top of the concrete cushion layer, and the upper end of the plastic water pipe is connected with the water tank through a first drainage pipe. The structure can effectively intercept underground water seeping between the structural outer wall and the foundation pit slope, and structural erosion accidents are avoided.

Description

Technical Field

[0001] This utility model relates to the field of groundwater construction technology, specifically to an underground water interception system for areas with high groundwater levels. Background Technology

[0002] In foundation pit engineering in areas with high groundwater levels, the conventional construction methods for addressing groundwater include dewatering during the excavation stage, underground anti-buoyancy engineering, and underground waterproofing. For dewatering during the excavation stage, a closed-loop waterstop curtain is typically constructed along the pit's edge, followed by dewatering within the pit and construction of the underground main structure. For anti-buoyancy engineering of the basement, anti-uplift piles or anti-buoyancy anchors are generally used to resist the buoyancy force exerted by groundwater on the basement floor. For underground waterproofing, a combination of waterproofing measures (such as waterproof membranes, waterproof coatings, waterstop steel plates, rubber expansion waterstop strips, and rubber expansion waterstop tapes) is typically employed to prevent groundwater damage to the main structure.

[0003] Because underground waterproofing is a concealed project, groundwater continues to seep into the aquifer even after the foundation pit is backfilled, and the direction and volume of seepage are uncertain. In areas with high groundwater levels, groundwater can seep directly into the basement floor and exterior walls through the trench between the basement exterior walls and the waterproof curtain, causing erosion of the underground structure and posing a significant safety hazard. Utility Model Content

[0004] The purpose of this invention is to provide an underground water interception system for areas with high groundwater levels, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides an underground water interception system for areas with high groundwater levels, comprising: a concrete cushion layer, which is located under the structural base slab and extends upward along the slope of the foundation pit to intercept groundwater seeping into the impermeable clay; impermeable clay, which is located between the foundation pit slope and the structural exterior wall, and is topped with plain concrete; a waterproof barrier layer, which is installed along the entire length of the structural base slab and the structural exterior wall near the impermeable clay, with a portion located between the concrete cushion layer and the structural base slab, and another portion located on the outside of the structural exterior wall, where a horizontal construction joint is provided above the structural base slab; a water-stop steel plate, which is vertically installed in the structural exterior wall at the horizontal construction joint; and a plastic water pipe, which is vertically installed within the impermeable clay and the plain concrete capping, with the lower end of the plastic water pipe extending into the top of the concrete cushion layer and the upper end connected to a water tank via a first drainage pipe.

[0006] In a preferred embodiment, the well pipe is further comprising a sand-free concrete pipe, which is vertically disposed within a waterproof clay and plain concrete capping layer. The sand-free concrete pipe extends to the top of the concrete cushion layer, and a submersible pump is disposed at the bottom of the sand-free concrete pipe. A second drain pipe is disposed inside the sand-free concrete pipe, with its lower end connected to the submersible pump and its upper end connected to a water tank.

[0007] In a preferred embodiment, the lower end of the plastic water pipe is wrapped with geotextile, and a valve is installed at the upper end of the plastic water pipe, which is kept in a normally open state.

[0008] In a preferred embodiment, the outside of the sand-free concrete well casing is wrapped with a filter screen.

[0009] In a preferred embodiment, the lower half of the waterstop steel plate is located in the structural exterior wall below the horizontal construction joint, and the upper half of the waterstop steel plate is located in the structural exterior wall above the horizontal construction joint, with the concave surfaces formed by the folded edges at both ends of the waterstop steel plate facing the waterproof interlayer.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This invention involves placing a concrete cushion layer under the structural base slab and extending it upwards along the foundation pit slope. When groundwater seeps through the foundation pit slope towards the structural base slab and exterior walls, the portion of the concrete cushion layer extending along the slope intercepts the groundwater within these areas, allowing it to be discharged into a water tank via plastic pipes. A sand-free concrete well pipe can be used for long-term monitoring of the groundwater level outside the exterior walls. When the groundwater level is high, the groundwater is filtered through a screen and enters the sand-free concrete well pipe. At this point, a submersible pump within the well pipe can be activated to pump the groundwater into the water tank. This invention effectively intercepts groundwater seeping between the exterior walls and foundation pit slope, preventing structural erosion. It is highly adaptable, saves on later maintenance costs, and the water tank can also serve as a fire emergency water tank and a domestic water tank. The collected groundwater can be used for both fire emergency water and domestic water, making it green, low-carbon, and environmentally friendly, aligning with sustainable development design principles. Attached Figure Description

[0012] Figure 1 This is a structural cross-sectional view of the underground water interception system in a high groundwater level area according to this utility model;

[0013] Figure 2 This is a top view of the structure of the sand-free concrete well pipe in this utility model.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1-Concrete cushion layer, 2-Structural base slab, 3-Structural exterior wall, 4-Plain concrete coping, 5-Horizontal construction joint, 6-Waterstop steel plate, 7-Structural waterproof layer, 8-Geotextile, 9-Plastic water pipe, 10-Valve, 11-Sand-free concrete well pipe, 12-Filter screen, 13-Submersible pump, 14-Drainage pipe 1, 15-Drainage pipe 2, 16-Water tank, 17-Waterproof clay, 18-Foundation pit slope. Detailed Implementation

[0016] The technical solutions in the embodiments of this utility model will be clearly and completely described below. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0017] Example 1

[0018] like Figures 1 to 2 As shown, the underground water interception system for areas with high groundwater levels of this utility model includes: a concrete cushion layer 1, a plain concrete capping 4, a water-stop steel plate 6, a waterproof partition layer 7, a plastic water pipe 9, a sand-free concrete well pipe 11, a submersible pump 13, a first drainage pipe 15, a water tank 16, and a water-resistant clay 17. The concrete cushion layer 1 is located under the structural base slab 2 and has an extension section extending upwards along the foundation pit slope 18 to intercept groundwater seeping into the water-resistant clay 17. The water-resistant clay 17 is located between the foundation pit slope 18 and the structural outer wall 3, and a plain concrete capping 4 is provided on top of the water-resistant clay 17. The waterproof partition layer 7 is installed along the entire length of the structural base 2 and the structural outer wall 3 on the side close to the water-resistant clay 17. Part of the waterproof partition layer 7 is located between the concrete cushion layer 1 and the structural base slab 2, and another part of the waterproof partition layer 7 is located on the outside of the structural outer wall 3 to prevent groundwater from eroding the structural outer wall 3 and the structural base slab 2. A horizontal construction joint 5 is provided above the structural base slab 2 in the structural exterior wall 3, and a water-stop steel plate 6 is vertically installed in the structural exterior wall 3 at the horizontal construction joint 5. A plastic water pipe 9 is vertically installed in the waterproof clay 17 and plain concrete capping 4, with the lower end of the plastic water pipe 9 extending into the top of the concrete pad 1 and the upper end connected to the water tank 16 through the first drainage pipe 15.

[0019] Furthermore, the sand-free concrete well pipe 11 is vertically installed within the impermeable clay 17 and the plain concrete capping 4. The sand-free concrete well pipe 11 extends to the top of the concrete cushion layer 1, and a submersible pump 13 is installed at the bottom of the sand-free concrete well pipe 11. A second drainage pipe 14 is installed inside the sand-free concrete well pipe 11, with its lower end connected to the submersible pump 13 and its upper end connected to the water tank 16. The outside of the sand-free concrete well pipe 11 is wrapped with a filter screen 12 to filter groundwater seeping into the impermeable clay 17 and prevent soil particles from entering the sand-free concrete well pipe 11 and clogging it.

[0020] Furthermore, the lower end of the plastic water pipe 9 is wrapped with geotextile 8, and a valve 10 is installed at the upper end of the plastic water pipe 9, with the valve 10 kept in a normally open state.

[0021] Furthermore, the lower half of the waterstop steel plate 6 is located in the structural exterior wall 3 below the horizontal construction joint 5, and the upper half of the waterstop steel plate 6 is located in the structural exterior wall 3 above the horizontal construction joint 5. The concave surface formed by the folded edges at both ends of the waterstop steel plate 6 faces the waterproof barrier layer 7, which is used to delay the seepage path of groundwater.

[0022] Example 2

[0023] The working principle of this utility model is described below:

[0024] When groundwater seeps through the foundation pit slope 18 towards the structural base slab 2 and the structural exterior wall 3, the portion of the concrete cushion layer 1 extending along the foundation pit slope 18 can intercept the groundwater within the structural base slab 2 and the foundation pit slope 18, and discharge it into the water tank 16 through the plastic water pipe 9. The sand-free concrete well pipe 11 can be used for long-term monitoring of the groundwater level outside the structural exterior wall 3. When the groundwater level is high, groundwater enters the sand-free concrete well pipe 11 after being filtered by the filter screen 12. At this time, the submersible pump 13 in the sand-free concrete well pipe 11 can be activated to pump the water and discharge it into the water tank 16. On the other hand, a waterproof layer 7 is installed along the entire length of the structural base slab 2 and the structural exterior wall 3 near the waterproof clay 17, and a water-stop steel plate 6 is vertically installed at the horizontal construction joint 5 of the structural exterior wall 3 to effectively prevent groundwater from entering the interior of the structural exterior wall 3. This utility model can effectively intercept groundwater seeping into the area between the outer wall 3 of the structure and the slope 18 of the foundation pit, thus preventing structural erosion accidents. It has strong applicability and saves on later maintenance costs. At the same time, the water tank 16 can also serve as a fire emergency water tank and a daily water tank. The collected groundwater can be used for both fire emergency water and daily water use. It is green, low-carbon and environmentally friendly, and conforms to the design concept of sustainable development.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A subsurface drainage system for high groundwater areas, characterized by: The application relates to a concrete cushion (1) arranged under a structure bottom plate (2) and provided with an extension section upwards along a foundation pit slope (18) for intercepting underground water seepage into water-resistant clay (17); the water-resistant clay (17) is arranged between the foundation pit slope (18) and a structure outer wall (3), and a plain concrete coping (4) is arranged on the top of the water-resistant clay (17); a waterproof partition (7) is arranged on the structure bottom plate (2) and the structure outer wall (3) near the water-resistant clay (17), one part of the waterproof partition (7) is arranged between the concrete cushion (1) and the structure bottom plate (2), and the other part is arranged outside the structure outer wall (3), and a horizontal construction joint (5) is arranged on the structure bottom plate (2) above the structure outer wall (3); a water-stop steel plate (6) is vertically arranged in the structure outer wall (3) at the horizontal construction joint (5); a plastic water pipe (9) is vertically arranged in the water-resistant clay (17) and the plain concrete coping (4), the lower end of the plastic water pipe (9) extends into the top of the concrete cushion (1), and the upper end of the plastic water pipe (9) is connected with a water tank (16) through a first drain pipe (15). The application further comprises a sand-free concrete well pipe (11) vertically arranged in the water-resistant clay (17) and the plain concrete coping (4), the sand-free concrete well pipe (11) extends into the top of the concrete cushion (1), and a submersible pump (13) is arranged at the bottom of the sand-free concrete well pipe (11), a second drain pipe (14) is arranged in the sand-free concrete well pipe (11), the lower end of the second drain pipe (14) is connected with the submersible pump (13), and the upper end of the second drain pipe (14) is connected with the water tank (16). The lower end of the plastic water pipe (9) is wrapped with geotextile (8), a valve (10) is arranged at the upper end of the plastic water pipe (9), and the valve (10) is kept in an open state. The sand-free concrete well pipe (11) is wrapped with a filter screen (12) outside. The lower half of the water-stop steel plate (6) is arranged in the structure outer wall (3) below the horizontal construction joint (5), the upper half of the water-stop steel plate (6) is arranged in the structure outer wall (3) above the horizontal construction joint (5), and the concave surface formed by the folded edges of the water-stop steel plate (6) faces the waterproof partition (7). ​ 2. The underground water interception system for high water table areas as claimed in claim 1 wherein: ​ 3. The underground water interception system for high water table areas as claimed in claim 2 wherein: ​ 4. The underground water interception system for high water table areas as claimed in claim 3 wherein: ​ 5. The underground water interception system for high water table areas as claimed in claim 1 wherein: ​

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