Pipeline foundation pit dewatering structure for loose sand stratum
By adopting a combined precipitation structure that tilts out of the pit and inside the pit in the loose sandy soil strata, the problem of difficulty in excavating trenches under high groundwater levels is solved, and synchronous precipitation outside and inside the pit is achieved, which improves precipitation efficiency and construction efficiency and reduces costs.
Patent Information
- Application Number
- CN202421605501.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-08
AI Technical Summary
Under high groundwater conditions, loose sandy soil strata are difficult to form, resulting in difficulty in excavating trenches. The existing precipitation structure requires water stop curtains and pipe wells to precipitate, which is relatively expensive.
A combined precipitation structure that tilts outward and inside the pit is adopted, including support piles and well point precipitation components. The staggered well point precipitation components are used to achieve synchronous precipitation outside and inside the pit, avoiding the setting of a water stop curtain.
Synchronous precipitation outside and inside the pit is achieved, without the need to set up a water stop curtain, which improves precipitation efficiency, simplifies the structure, and saves construction costs and construction periods.
Smart Images
Figure CN222796487U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of drainage of foundation pits, in particular to a pipeline foundation pit drainage structure in a loose sandy soil layer. Background Art
[0002] Loose sand is often difficult to form during trench excavation due to its lack of cohesion. When there is a high groundwater level, the seepage force along the slope will often cause the fine sand and soil particles to suspend or move, making it impossible to form the trench. At the same time, after excavation to the designed elevation, the runoff at the bottom of the trench will also make it impossible to form the bottom of the trench.
[0003] The most mature and widely used trench excavation construction method for high groundwater level sandy soil strata is steel sheet pile support. In addition to setting support piles, it is also necessary to set up a closed water-stop curtain and dewatering in the pit. The surrounding area also needs to be supplemented by pipe well dewatering. The depth of pipe well dewatering is not restricted, but the cost is often high. Utility Model Content
[0004] In view of the deficiencies of the above-mentioned prior art, the utility model provides a dewatering structure for a pipeline foundation pit in a loose sandy soil stratum. Based on the traditional dewatering structure, the dewatering structure is improved by adopting a combined dewatering structure inclined toward the outside and inside of the pit to achieve synchronous dewatering outside and inside the pit without the need to set up a water-stop curtain.
[0005] The utility model provides a technical solution: a loose sandy soil stratum pipeline foundation pit dewatering structure, comprising supporting piles and well-point dewatering components, wherein the supporting piles are respectively arranged in a group along the two outer sides of the foundation pit, and each group is equidistantly arranged with a plurality of supporting piles, and the well-point dewatering components are respectively arranged in a group along the two sides inside the foundation pit, and each group is provided with a plurality of well-point dewatering components, and the two groups of well-point dewatering components are arranged in a staggered manner, and the plurality of well-point dewatering components in the same group are connected together by connecting pipes, and a water pump is arranged at the end of each connecting pipe for pumping out the accumulated water inside and outside the foundation pit, and each of the well-point dewatering components comprises a well-point pipe inclined toward the outside of the pit, a vertical well-point pipe and a well-point pipe inclined toward the inside of the pit, and the top of the vertical well-point pipe is connected to the well-point pipe inclined toward the outside of the pit and the well-point pipe inclined toward the inside of the pit through a tee to form a well-point dewatering component.
[0006] Furthermore, the vertical well point pipe is located inside the foundation pit, close to the support piles, the well point pipe inclined outward from the pit has an outward inclination angle of 15-20 degrees, and the well point pipe inclined inward from the pit has an inward inclination angle of 15-20 degrees.
[0007] Furthermore, the three well point pipes are all made of PVC pipes with a diameter of 30-50 mm. Each well point pipe includes an upper solid pipe and a lower filter pipe. The filter holes at the filter pipe have a diameter of 10-20 mm. The filter holes are arranged in a plum blossom shape with a spacing of 50-70 mm. The filter pipe is wrapped with two layers of non-woven geotextile.
[0008] Furthermore, the well point pipe is 8-10 m long and the filter pipe is 2-3 m long.
[0009] Furthermore, the horizontal spacing of the well point dewatering components is 10-20m, the net spacing of the support piles is not less than 30cm, and the support piles are steel pipe piles or cast-in-place piles.
[0010] Furthermore, a sump is provided at the bottom of the foundation pit, and a PVC flower pipe for drainage is laid in the sump, and drainage is carried out through a dragon suction device.
[0011] Furthermore, the water collection pit is opened along both sides of the foundation pit, and a water collection well is excavated and arranged every 20-40m along the groove direction of the foundation pit. A dragon water suction device is arranged in the water collection well, and the water collected by the PVC flower pipe is drained into the water collection well through the dragon water suction device.
[0012] Furthermore, the diameter of the PVC flower pipe is 150-200 mm.
[0013] Beneficial effects of the utility model:
[0014] (1) Through the well point dewatering components tilted toward the outside and inside of the pit, synchronous dewatering is achieved outside and inside the pit without the need to set up a water-stop curtain;
[0015] (2) A water collection pit is set at the bottom of the foundation pit. When there is a lot of water at the bottom of the pit on rainy days, it can be drained through the PVC flower pipes and the dragon water suction equipment, which greatly improves the precipitation efficiency;
[0016] (3) The structure is simple and can effectively solve the drainage problem in loose sandy soil layers with high groundwater levels, improve on-site construction efficiency and quality, and save construction time. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the foundation pit excavation section of the utility model;
[0018] Figure 2 It is the layout plan of the utility model;
[0019] In the figure: 1—support piles, 2—well point dewatering assembly, 201—well point pipe inclined toward the outside of the pit, 202—vertical well point pipe, 203—well point pipe inclined toward the inside of the pit, 3—foundation pit, 4—connecting pipe, 5—collecting pit, 6—PVC flower pipe, 7—groundwater level. DETAILED DESCRIPTION
[0020] The present invention is further described below in conjunction with specific implementation methods, wherein the accompanying drawings are only used for exemplary descriptions and represent only schematic diagrams rather than actual drawings, and should not be understood as limiting the present invention. In order to better illustrate the specific implementation methods of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. Based on the specific implementation methods of the present invention, all other specific implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0021] In the description of the present invention, it should be noted that the terms "front", "rear", "upper" and "lower" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0022] like Figure 1 and Figure 2 A loose sandy soil stratum pipeline foundation pit dewatering structure shown in the figure includes supporting piles 1 and well point dewatering components 2, wherein the supporting piles 1 are respectively arranged in a group along the two outer sides of the foundation pit 3, and each group is equidistantly arranged with a plurality of supporting piles 1, and the well point dewatering components 2 are respectively arranged in a group along the two sides inside the foundation pit 3, and each group is provided with a plurality of well point dewatering components 2, and the two groups of well point dewatering components 2 are staggered, and the plurality of well point dewatering components 2 in the same group are connected together by connecting pipes 4, and a water pump is provided at the end of each connecting pipe 4 for pumping out the accumulated water inside and outside the foundation pit, and each of the well point dewatering components 2 includes a well point pipe 201 inclined toward the outside of the pit, a vertical well point pipe 202 and a well point pipe 203 inclined toward the inside of the pit, and the top of the vertical well point pipe 202 is connected to the well point pipe 201 inclined toward the outside of the pit and the well point pipe 203 inclined toward the inside of the pit through a tee to form a well point dewatering component 2.
[0023] The vertical well point pipe 202 is located inside the foundation pit 3, close to the support pile 1, the well point pipe 201 inclined outward from the pit has an outward inclination angle of 15-20 degrees, and the well point pipe 203 inclined inward from the pit has an inward inclination angle of 15-20 degrees.
[0024] The three well point pipes are all made of PVC pipes with a diameter of 30-50mm. Each well point pipe includes a solid pipe at the top and a filter pipe at the bottom. The filter holes at the filter pipe have a diameter of 10-20mm. The filter holes are arranged in a plum blossom shape with a spacing of 50-70mm. The filter pipe is wrapped with two layers of non-woven geotextile. The length of the well point pipe is 8-10m, and the length of the filter pipe is 2-3m.
[0025] The horizontal spacing between the well point dewatering components 2 is 10-20m, the net spacing between the support piles 1 is not less than 30cm, and the support piles 1 are steel pipe piles or cast-in-place piles.
[0026] A water collection pit 5 is provided at the bottom of the foundation pit 3, and a PVC flower pipe 6 for drainage is laid in the water collection pit 5, and drainage is carried out through a dragon water suction device. Specifically, the water collection pit 5 is respectively opened along both sides of the inside of the foundation pit 3, and a water collection well is excavated and arranged every 20-40m along the groove direction of the foundation pit 3. A dragon water suction device is provided in the water collection well, and the water collected by the PVC flower pipe 6 is drained into the water collection well through the dragon water suction device. The diameter of the PVC flower pipe 6 is 150-200mm.
[0027] During the specific construction of the utility model, support piles 1 are first constructed on both outer sides of the foundation pit 3, and the support piles 1 are arranged at a certain interval. Then, the well point dewatering components 2 are constructed, so that the three well point pipes are respectively vertically in the pit, inclined to the outside of the pit, and inclined to the inside of the pit. The well point dewatering components 2 are located on both sides of the inside of the foundation pit 3, and the two sides are staggered. 75-100mm PVC solid pipes are used to connect the well point dewatering components 2 on both sides of the foundation pit, and an integral drainage system is formed on both sides of the foundation pit. The water of the entire drainage system is discharged by the set water pump. The excavation depth of the foundation pit is 4-5m. After the foundation pit 3 is excavated to the bottom of the pit, a sump 5 is opened, and PVC flower pipes 6 are laid in the sump 5 for drainage.
[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A loose sandy soil stratum pipeline foundation pit dewatering structure, characterized by: The invention comprises support piles (1) and well point dewatering components (2), wherein the support piles (1) are arranged in a group along the two outer sides of the foundation pit (3), and each group is provided with a plurality of support piles (1) at equal intervals; the well point dewatering components (2) are arranged in a group along the two inner sides of the foundation pit (3), and each group is provided with a plurality of well point dewatering components (2); the two groups of well point dewatering components (2) are arranged in a staggered manner, and the plurality of well point dewatering components (2) in the same group are connected together by a connecting pipe (4), and each connecting pipe (4) is connected to the well point dewatering component (2) in the same group. A water pump is provided at the end of the connecting pipe (4) for pumping out the accumulated water inside and outside the foundation pit. Each of the well point dewatering components (2) comprises a well point pipe (201) inclined toward the outside of the pit, a vertical well point pipe (202) and a well point pipe (203) inclined toward the inside of the pit. The top of the vertical well point pipe (202) is connected to the well point pipe (201) inclined toward the outside of the pit and the well point pipe (203) inclined toward the inside of the pit through a tee to form a well point dewatering component (2).
2. The loose sandy soil stratum pipeline foundation pit dewatering structure according to claim 1 is characterized by: The vertical well point pipe (202) is located inside the foundation pit (3), close to the support pile (1), the well point pipe (201) inclined outside the pit has an outward inclination angle of 15-20 degrees, and the well point pipe (203) inclined inside the pit has an inward inclination angle of 15-20 degrees.
3. The loose sandy soil stratum pipeline foundation pit dewatering structure according to claim 1 is characterized by: The three well point pipes are all made of PVC pipes with a diameter of 30-50mm. Each well point pipe includes a solid pipe at the top and a filter pipe at the bottom. The filter holes at the filter pipe have a diameter of 10-20mm. The filter holes are arranged in a plum blossom shape with a spacing of 50-70mm. The filter pipe is wrapped with two layers of non-woven geotextile.
4. The loose sandy soil stratum pipeline foundation pit dewatering structure according to claim 3 is characterized by: The length of the well point pipe is 8-10m and the length of the filter pipe is 2-3m.
5. The loose sandy soil stratum pipeline foundation pit dewatering structure according to claim 1 is characterized by: The horizontal spacing between the well point dewatering components (2) is 10-20m, the net spacing between the support piles (1) is not less than 30cm, and the support piles (1) are steel pipe piles or cast-in-place piles.
6. The loose sandy soil stratum pipeline foundation pit dewatering structure according to claim 1 is characterized by: A water collection pit (5) is provided at the bottom of the foundation pit (3), and a PVC flower pipe (6) for drainage is laid in the water collection pit (5), and drainage is carried out through a dragon suction device.
7. The loose sandy soil layer pipeline foundation pit dewatering structure according to claim 6 is characterized by: The water collection pit (5) is opened along both sides of the inside of the foundation pit (3), and a water collection well is excavated and arranged every 20-40m along the groove direction of the foundation pit (3). A dragon water suction device is arranged in the water collection well, and the water collected by the PVC flower pipe (6) is drained into the water collection well through the dragon water suction device.
8. The loose sandy soil stratum pipeline foundation pit dewatering structure according to claim 6, characterized in that: The diameter of the PVC flower tube (6) is 150-200 mm.