Deep foundation pit elevator foundation pit dewatering well structure
By setting up a precipitation well and a blind drainage ditch at the bottom on the outside of the deep foundation pit elevator foundation pit, the problem of water in the elevator foundation pit cannot be discharged in time is solved, and efficient foundation pit precipitation effect is achieved, ensuring the construction quality and construction period.
Patent Information
- Application Number
- CN202422085268.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-27
AI Technical Summary
In the prior art, water in the deep foundation pit elevator foundation pit cannot be discharged in time, resulting in delays in construction quality and construction period.
Precipitation wells are arranged outside the main body of the foundation pit, and a blind drainage ditches connected to the well pipe are set up around the bottom of the foundation pit. The foundation pit is precipitated by well point precipitation, and the water filter layer is filled on the outside of the well pipe, and the well pipe extends through the reinforcement to the inside of the foundation pit.
It realizes effective discharge of large-area water levels in the foundation pit, ensures drying of the pit bottom and cushion layer, ensures construction quality and shortens construction period.
Smart Images
Figure CN223135167U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building foundation pit dewatering, in particular to a dewatering well structure for an elevator foundation pit in a deep foundation pit. Background Art
[0002] According to the on-site construction requirements of a deep foundation pit, dewatering wells are usually installed outside or inside the foundation pit. However, due to the diverse changes in the flow direction of underground water, if only dewatering wells are set, the water in the elevator foundation pit cannot be drained in time. Summary of the Utility Model
[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a dewatering well structure for an elevator foundation pit in a deep foundation pit, which can effectively drain the water in the elevator foundation pit.
[0004] To achieve the above technical effects, the utility model provides a dewatering well structure for an elevator foundation pit in a deep foundation pit, including foundation soil and a foundation pit main body arranged in the foundation soil. The dewatering well structure for the elevator foundation pit in the deep foundation pit includes:
[0005] A cushion layer arranged at the bottom of the foundation pit main body, a reinforcement member is built on the slope of the foundation pit main body, a dewatering well is arranged in the foundation soil outside the foundation pit main body, a well pipe communicating with the inside of the foundation pit main body is arranged in the dewatering well, a drainage blind ditch is arranged around the bottom of the foundation pit main body below the cushion layer, and the drainage blind ditch is communicated with the well pipe.
[0006] Preferably, a filter layer is filled outside the well pipe in the dewatering well.
[0007] Preferably, the reinforcement member is bricks built on the surface of the slope.
[0008] Preferably, the well pipe passes through the reinforcement member and extends into the inside of the foundation pit main body.
[0009] Due to the adoption of the above technical solution, the technical effects obtained by the utility model are as follows:
[0010] In the deep foundation pit dewatering work, by arranging dewatering wells outside the foundation pit main body and adopting the well point dewatering method for foundation pit dewatering, in addition to ensuring that the water level of a large area inside the foundation pit meets the requirements, drainage blind ditches communicated with the well pipes are arranged around the bottom of the foundation pit to achieve the foundation pit drainage effect, ensure the dryness of the bottom of the pit and the cushion layer, and create conditions for subsequent waterproof operations, that is, ensure the quality and save the construction period. Brief Description of the Drawings
[0011] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.
[0012] Figure 1 This is the precipitation well structure of the deep foundation pit elevator foundation pit in the embodiment of the present utility model.
[0013] The corresponding relationship of the reference numerals in the accompanying drawings is as follows:
[0014] 1 - Foundation pit main body; 2 - Foundation soil; 3 - Precipitation well; 4 - Well pipe; 5 - Filter layer; 6 - Reinforcement member; 7 - Cushion layer; 8 - Drainage blind ditch. Specific implementation manners
[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.
[0016] Please refer to Figure 1 As shown, the embodiment of the present utility model provides a precipitation well structure for a deep foundation pit elevator foundation pit, including foundation soil 2 and a foundation pit main body 1 provided in the foundation soil 2. The foundation pit main body 1 has a 45° slope. The precipitation well structure for the deep foundation pit elevator foundation pit includes a cushion layer 7 provided at the bottom of the foundation pit main body 1. A reinforcement member 6 is provided on the slope of the foundation pit main body 1. A precipitation well 3 is provided in the foundation soil 2 outside the foundation pit main body 1. A well pipe 4 communicating with the inside of the foundation pit main body 1 is provided in the precipitation well 3. Drainage blind ditches 8 are provided around the bottom of the foundation pit main body 1 below the cushion layer 7, and the drainage blind ditches 8 are communicated with the well pipe 4. It should be noted that in this embodiment, the cushion layer 7 is filled with gravel and has a thickness of 150 mm. The size of the drainage blind ditch 8 is 300 mm * 300 mm (width * height). After the excavation of the foundation pit main body 1 is completed, the drainage blind ditch 8 is dug in time. After the drainage blind ditch 8 is backfilled with gravel, a layer of geotextile is laid. The drainage blind ditch 8 slopes 3% towards the precipitation well 3. Preferably, before the precipitation well 3 is set, the precipitation well 3 needs to be calculated first. Considering that the exact value of the aquifer thickness H cannot be obtained, when calculating the total pumping volume of the elevator foundation pit using the unconfined uncompleted well formula, there are missing conditions. Therefore, the effective aquifer thickness needs to be obtained using the Marzarin formula, and then the number of precipitation wells 3 is calculated.
[0017] Furthermore, in this embodiment, a water filtration layer 5 is filled outside the well pipe 4 in the precipitation well 3. The water filtration layer 5 is built and compacted with gravel having a diameter of about 20 mm to 40 mm. Preferably, the well pipe 4 passes through the reinforcement member 6 and extends into the interior of the foundation pit main body 1. In this embodiment, the reinforcement member 6 is red bricks built on the slope surface, with a building thickness of 240 mm. The bottom is 250 mm above the bottom soil of the foundation pit main body 1. After completion of the building, plastering is carried out with 1:2 cement mortar, and the plastering thickness is 20 mm.
[0018] Furthermore, after the construction of the precipitation well 3 is completed, well sealing treatment needs to be carried out in the later stage. Specifically, when constructing the foundation raft of the basement main body, a water stop wing ring should be welded to the wall of the precipitation well. The water stop wing ring is welded with a circular steel ring. The diameter of the steel ring is the same as that of the steel pipe. The wing ring is 60 mm wide and 4 mm thick, and is welded on both sides. The welding position is 30 - 40 cm above the bottom of the large-area raft to prevent groundwater from surging up along the well wall. A rubber water stop strip is installed at the position of the wing ring and the well pipe, and at the same time, the waterproof coiled material is pasted to the wing ring part.
[0019] After the concrete of the elevator foundation pit of the foundation raft of the foundation pit is poured to the top of the elevator foundation pit, the concrete elevation is higher than the groundwater elevation. Wait for about 1 hour or so, organize personnel to enter the foundation pit, and plug the precipitation wells in the pit. The precipitation wells are plugged by pouring concrete into the steel pipes. When the precipitation of the precipitation wells stops, dry cement is used for paving the bottom. After backfilling the cement, concrete equivalent to that of the raft foundation is poured into the well pipe. When the concrete is poured to the position of the well pipe orifice, a 4-mm-thick blind plate is used for sealing welding to ensure the waterproof effect. After the blind plate sealing welding is completed, a 20 * 30-mm expansion rubber water stop strip is added in a circle under the blind plate, and the whole well pipe is poured into the raft foundation along with the overall concrete.
[0020] Parts not involved in the present utility model are the same as or can be implemented by using the prior art. Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.
Claims
1. A dewatering well structure for an elevator pit in a deep foundation pit, comprising foundation soil and a pit main body arranged in the foundation soil, characterized in that, The dewatering well structure of the deep foundation pit elevator pit includes a cushion layer provided at the bottom of the foundation pit main body, a reinforcement member is provided on the slope of the foundation pit main body, a dewatering well is provided in the foundation soil outside the foundation pit main body, a well pipe communicating with the inside of the foundation pit main body is provided in the dewatering well, drainage blind ditches are provided around the bottom of the foundation pit main body below the cushion layer, and the drainage blind ditches are communicated with the well pipe.
2. The deep foundation pit elevator pit dewatering well structure according to claim 1, characterized in that: A filter layer is filled outside the well pipe in the dewatering well.
3. The deep foundation pit elevator pit dewatering well structure according to claim 1, characterized in that: The well pipe passes through the reinforcement member and extends into the inside of the foundation pit main body.
4. The deep foundation pit elevator pit dewatering well structure according to claim 1, characterized in that: The reinforcement member is bricks laid on the surface of the slope.