A silty base drainage ditch
By excavating trapezoidal grooves on the soil surface and setting up three-dimensional mesh blind pipes and filter layers, combined with water collection wells and water pumps, the problem of poor drainage in deep foundation pits with silty soil was solved, achieving effective drainage and improving the stability of the foundation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA CONSTR SECOND ENG BUREAU LTD
- Filing Date
- 2025-06-05
- Publication Date
- 2026-05-26
AI Technical Summary
Poor drainage of the silty foundation of deep foundation pits can lead to the inability to effectively and timely remove seepage water from the pit slopes, which can cause the foundation layer to float and shift, threatening the safety of scaffolding and other facilities.
Trapezoidal grooves are excavated on the soil surface, and three-dimensional mesh blind pipes and filter layers are installed. Combined with a water collection well and a water pump, water is introduced into the water collection well through the blind pipes and then pumped out. The outside of the blind pipes is wrapped with geotextile to prevent clogging. The filter layer is made of sand and gravel, and a concrete cushion layer prevents surface water from seeping into the ground.
It enables organized drainage of silty foundations in deep foundation pits, reduces the risk of soil erosion, and improves foundation stability. It is suitable for the construction of drainage ditches for silty foundations in deep foundation pits.
Smart Images
Figure CN224281338U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of foundation pit drainage technology, and in particular to a drainage ditch with a silty base. Background Technology
[0002] For deep foundation pit engineering, drainage of the foundation base often involves setting up a ring-shaped masonry drainage ditch and sump well along the bottom of the foundation pit slope. The construction process is complicated and the drainage is easily blocked by dust and garbage in the foundation pit. At the same time, in the case of deep foundation pit with silty foundation, it is not possible to drain the seepage water from the foundation pit slope in a timely and effective manner, which can easily cause the foundation pit cushion layer to float, resulting in cracks and displacement, thereby threatening the scaffolding and temporary facilities above the cushion layer. Utility Model Content
[0003] To address the aforementioned problems, this utility model discloses a drainage ditch with a silty base. A trapezoidal groove is excavated on the soil surface, and a filter layer is installed within the groove. Blind pipes, forming a three-dimensional mesh, are interspersed within the filter layer. Water from the soil seeps into the filter layer and then into the blind pipes.
[0004] Water collection wells are spaced apart on the groove, and water pumps are installed inside the water collection wells. The end of the blind pipe extends into the water collection well. Water enters the water collection well through the blind pipe, and the water pump operates to extract the water.
[0005] Preferably, the outer side of the blind pipe is wrapped with geotextile, and the geotextile is wrapped in at least two layers. This prevents water from carrying mud and sand into the blind pipe and causing blockage.
[0006] Preferably, the slope of the blind pipe is not less than 3‰. The water collection well is located at the lower end of the blind pipe, facilitating the smooth flow of water into the well.
[0007] Preferably, the filter layer is made of sand and gravel. This facilitates water permeability. The filter layer is laid in two stages: after the first stage, a blind pipe is placed before the second stage.
[0008] Preferably, a concrete pad is laid on the upper surface of the filter layer. The concrete pad prevents surface water from seeping into the ground. The slope of the concrete pad is not less than 3‰, and water on the concrete pad can flow into the collection well.
[0009] Preferably, a water pipe is fixedly connected to the output end of the water pump, and a well cover is provided on the upper end of the water collection well. The edge of the well cover has an opening, and the water pipe extends from the opening. When the water pump operates, it sends the water collected in the water collection well away through the water pipe.
[0010] Preferably, the water collection well is cylindrical in shape, with a wall thickness of not less than 30 mm, an inner diameter of not less than 300 mm, and a depth of not less than 500 mm.
[0011] Preferably, the water collection well and the well cover are prefabricated components, both made of concrete or steel. The use of prefabricated components facilitates reuse after subsequent excavation.
[0012] The beneficial effects of this utility model are as follows: This utility model adopts a buried blind pipe in combination with a water collection well, which can effectively solve the problem of organized drainage of the silty soil foundation of deep foundation pits, reduce the risk of soil erosion, and greatly improve the stability of the foundation. It is suitable for the construction of drainage ditches for the silty soil foundation of deep foundation pits. Attached Figure Description
[0013] Figure 1 This is a partial three-dimensional schematic diagram of the present invention;
[0014] Figure 2 This is a cross-sectional schematic diagram of the water collection well of this utility model;
[0015] Figure 3 This is a schematic diagram of the slope (α) of the blind pipe of this utility model.
[0016] List of reference numerals in the attached diagram:
[0017] 1. Blind pipe; 2. Geotextile; 3. Filter layer; 4. Soil layer; 5. Concrete cushion layer; 6. Manhole cover; 7. Sump; 8. Water pump; 9. Water pipe. Detailed Implementation
[0018] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.
[0019] like Figures 1 to 3 As shown, a silty base drainage ditch has a trapezoidal groove excavated on the surface of soil layer 4, specifically with a trapezoidal cross-sectional profile. A filter layer 3 is installed in the groove, and water in soil layer 4 seeps into the filter layer 3. Blind pipes 1 are interspersed inside the filter layer 3, and water flows into the blind pipes 1. The blind pipes 1 are three-dimensional meshes made of a filter membrane made of corrosion-resistant fiber and modified polyethylene interwoven together, and the diameter is no more than 200 mm.
[0020] Water collection wells 7 are spaced apart on the groove. Water pumps 8 are installed inside the water collection wells 7. When the water pumps 8 work, they drain the water in the water collection wells 7. The end of the blind pipe 1 extends into the water collection well 7, that is, water seeps into the blind pipe 1 and enters the water collection well 7. At the same time, the length of the blind pipe 1 extending into the water collection well 7 is not less than 50mm. In addition, the through hole of the blind pipe 1 and the side wall of the water collection well 7 is interference fit.
[0021] The blind pipe 1 is wrapped with geotextile 2, and the number of geotextile 2 wrapping layers is not less than two. The geotextile 2 is installed to prevent sand and gravel from entering the blind pipe 1 and causing blockage.
[0022] The slope α of blind pipe 1 is not less than 3‰, which facilitates the flow of water into collection well 7.
[0023] Filter layer 3 is composed of sand and gravel. Specifically, it is a mixture of 10-30mm graded pebbles and 2-5mm graded sand.
[0024] A concrete pad 5 is laid on the upper surface of the filter layer 3 to prevent water from seeping down the soil surface.
[0025] A water pipe 9 is fixedly connected to the output end of the water pump 8. A well cover 6 is installed on the upper end of the water collection well 7. An opening is provided on the edge of the well cover 6, and the water pipe 9 extends out from the opening. When the water pump 8 is started, water is pumped out through the water pipe 9.
[0026] The water collection well 7 is cylindrical in shape, with a wall thickness of not less than 30mm, an inner diameter of not less than 300mm, and a depth of not less than 500mm.
[0027] The water collection well 7 and the well cover 6 are prefabricated components, both made of concrete or steel. The prefabrication method facilitates rapid construction, and the prefabricated water collection well 7 and well cover 6 can be collected and reused during subsequent dismantling.
[0028] The technical means disclosed in this utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.
Claims
1. A drainage ditch with a silty base, wherein a trapezoidal groove is excavated on the surface of the soil layer (4), characterized in that, A filter layer (3) is provided in the groove, and a blind tube (1) is interspersed inside the filter layer (3), and the blind tube (1) is a three-dimensional mesh. Water collection wells (7) are spaced apart on the groove, and water pumps (8) are installed inside the water collection wells (7). The end of the blind pipe (1) extends into the water collection wells (7).
2. The silty-based drainage ditch according to claim 1, characterized in that: The blind tube (1) is wrapped with geotextile (2) on the outside, and the number of layers of geotextile (2) is not less than two.
3. A silty-based drainage ditch according to claim 1, characterized in that: The slope α of the blind pipe (1) is not less than 3‰.
4. A silty-based drainage ditch according to claim 1, characterized in that: The filter layer (3) is sand and gravel.
5. A silty-based drainage ditch according to claim 1, characterized in that: The upper surface of the filter layer (3) is covered with a concrete pad layer (5).
6. A silty-based drainage ditch according to claim 1, characterized in that: The output end of the water pump (8) is fixedly connected to a water pipe (9), and the upper end of the water collection well (7) is covered with a well cover (6). The edge of the well cover (6) is provided with an opening, and the water pipe (9) extends out from the opening.
7. A silty-based drainage ditch according to claim 1, characterized in that: The water collection well (7) is cylindrical in shape, with a wall thickness of not less than 30 mm, an inner diameter of not less than 300 mm, and a depth of not less than 500 mm.
8. A silty-based drainage ditch according to claim 1, characterized in that: The water collection well (7) and the well cover (6) are prefabricated components, both made of concrete or steel.