CN218933180U - Combined precipitation well structure - Google Patents
Combined precipitation well structure Download PDFInfo
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- CN218933180U CN218933180U CN202223396794.7U CN202223396794U CN218933180U CN 218933180 U CN218933180 U CN 218933180U CN 202223396794 U CN202223396794 U CN 202223396794U CN 218933180 U CN218933180 U CN 218933180U
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Abstract
The utility model belongs to the technical field of pipe well filtering devices, and discloses a combined dewatering well structure which comprises a sand-free concrete filter pipe, a bridge-type filter pipe and a sand pebble filter layer; the sand-free concrete filter pipe is arranged in the fine-grained soil layer, the bridge-type filter pipe is arranged in the coarse-grained soil layer, and the sand pebble filter material layer is arranged between the sand-free concrete filter pipe and the fine-grained soil layer and between the bridge-type filter pipe and the coarse-grained soil layer. The utility model has safe and reliable structure, can well solve the problems of low precipitation efficiency and engineering cost waste of a single pipe well structure in coarse-grained soil and fine-grained soil interbed strata, can also ensure the safety and quality of foundation pit engineering, and can be used for precipitation construction of oversized and ultra-deep foundation pit engineering with high ground water level.
Description
Technical Field
The utility model belongs to the technical field of pipe well filtering devices, and particularly relates to a combined dewatering well structure.
Background
With the continuous development of urban underground space development and utilization technology, ultra-deep and ultra-large foundation pit projects are more and more, when the engineering geological conditions and hydrogeological conditions of the foundation pit projects are complex, in the ultra-large and ultra-deep foundation pit projects which are rich in underground water, especially under the influence of underground bearing water, foundation pit dewatering and drainage are guarantees of foundation pit construction safety and quality, and especially in stratum where coarse-grained soil and fine-grained soil are mutually layered, it is important to take targeted dewatering measures in combination with engineering geological and hydrogeological characteristics.
At present, most of common foundation pit dewatering adopts pipe well dewatering, and the pipe well dewatering has the characteristics of large descending depth and large water pumping and draining amount. Usually, foundation pit dewatering is carried out before foundation pit engineering excavation in a water-rich stratum, the water level is reduced to 0.5m below the excavation surface of the foundation pit, and then soil is excavated.
The method comprises the following steps of (1) applying for No. CN202220472312.2, wherein the method comprises a precipitation well body arranged in a well hole and a fine stone hydrophobic layer buried between the precipitation well body and the inner wall of the well hole; the precipitation well body is including the dense mesh net, wire net and the steel skeleton that set gradually, and the dense mesh net is located the precipitation well and is close to the one side of fine stone hydrophobic layer, reduces the likelihood that precipitation well body lateral wall was stopped up, but this precipitation well longitudinal structure is comparatively single, if fail to carry out the precipitation well structural design of pertinence according to geological feature, often can have precipitation difficulty or increase construction cost's problem. For example, in a stratum where coarse-grained soil and fine-grained soil are layered, if only a single pipe well structure is adopted, not only a good dewatering effect cannot be achieved, but also engineering cost is wasted due to low dewatering efficiency, and engineering accidents can be caused when serious.
Disclosure of Invention
The utility model aims to provide a combined dewatering well structure, which adopts a combined pipe well structure in the vertical direction according to stratum conditions, improves dewatering efficiency, saves engineering cost, and simultaneously can ensure the safety and quality of foundation pit engineering.
The technical scheme adopted by the utility model is that the combined dewatering well structure comprises a sand-free concrete filter pipe, a bridge-type filter pipe and a sand pebble filter layer; the sand-free concrete filter pipe is arranged in the fine-grained soil layer, the bridge-type filter pipe is arranged in the coarse-grained soil layer, and the sand pebble filter material layer is arranged between the sand-free concrete filter pipe and the fine-grained soil layer and between the bridge-type filter pipe and the coarse-grained soil layer.
Preferably, the pipe wellbore diameter is 300-400 mm larger than the bridge filter diameter.
Preferably, the length of the sand-free concrete filter pipe is the same as the thickness of the fine soil layer, and the length of the bridge filter pipe is the same as the thickness of the coarse soil layer.
Preferably, the outer wall of the sand-free concrete water filtering pipe is coated with a nylon filter screen and geotextile.
Preferably, when the sand-free concrete water filter pipe is positioned at the bottommost part of the stratum, a bottom hole plug is arranged at the bottom of the sand-free concrete water filter pipe, and the bottom hole plug is made of the same material as the sand-free concrete water filter pipe.
Preferably, the top and bottom of the bridge type water filter pipe are provided with clamping supports, and the clamping supports are fixedly connected with the bridge type water filter pipe.
Preferably, the clamping support is connected with the bridge type water filtering pipe in a welding mode.
Preferably, the sandy pebble filter layer is 2-3 mm of gravel, and the gravel is uniformly distributed.
The utility model has the beneficial effects that:
compared with the common foundation pit dewatering well structure with single longitudinal structure, the combined dewatering well structure is safe and reliable, the sand-free concrete water filtering pipe is arranged in the fine-grained soil layer, and the bridge type water filtering pipe is arranged in the coarse-grained soil layer, so that the problems of low dewatering efficiency and engineering cost waste of the single pipe well structure in the coarse-grained soil and fine-grained soil interbed stratum can be well solved, meanwhile, the safety and quality of foundation pit engineering can be guaranteed, and the combined dewatering well structure can be used for dewatering construction of ultra-large and ultra-deep foundation pit engineering with high groundwater level and used for coarse-grained soil and fine-grained soil interbed stratum.
Drawings
FIG. 1 is a schematic cross-sectional view of a combined dewatering well according to the present utility model.
FIG. 2 is a schematic diagram of a bridge filter according to the present utility model.
The meaning of each mark in the above figures is: 1. the sand-free concrete filter pipe comprises a sand-free concrete filter pipe body, a clamping support body, a bridge type filter pipe body, a bridge type filter hole body, a sand pebble filter material layer, a pipe well hole, a well bottom plug and a well bottom plug.
Detailed Description
The utility model will be described in detail below with reference to the drawings and the detailed description.
The combined dewatering well structure of the utility model, please refer to fig. 1, comprises a sand-free concrete filter pipe 1, a bridge filter pipe 3 and a sand pebble filter layer 5.
The sand-free concrete water filter pipe 1 is buried in a fine-grained soil stratum according to geological conditions, the outer wall of the sand-free concrete water filter pipe 1 adopts a nylon filter screen and geotechnical cloth to carry out two-layer package filtration, and the arrangement of the nylon filter screen and the geotechnical cloth can prevent soil bodies in fine-grained soil from flowing into the sand-free concrete water filter pipe 1, so that the filtering effect is improved. When the sand-free concrete water filter pipe 1 is positioned at the bottommost part of a stratum, a bottom plug 7 is arranged at the bottom of the sand-free concrete water filter pipe 1, the material of the bottom plug 7 is consistent with that of the sand-free concrete water filter pipe 1, and the bottom plug 7 can isolate the soil body at the bottom of a pipe well from entering the sand-free concrete water filter pipe 1.
According to geological conditions, the bridge type water filtering pipe 3 is buried in the coarse-grained soil stratum, referring to fig. 2, the bridge type water filtering pipe 3 is provided with the clamping support 2 and the bridge type water filtering holes 4, the bridge type water filtering holes 4 are arranged at intervals, the bridge type water filtering holes 4 have the advantages of uniform water inflow and high water permeability, and the construction period is saved while the dewatering effect is improved. The top and the bottom of bridge type drainage pipe 3 all are provided with card and hold in the palm 2, and card holds in the palm 2 and bridge type drainage pipe 3 adoption welded connection becomes a whole, is convenient for be connected with no sand concrete drainage pipe 1 from top to bottom, guarantees the wholeness of tube well structure.
The sand-free concrete filter pipe 1 and the fine-grained soil stratum and the bridge-type filter pipe 3 and the coarse-grained soil stratum are filled with the sand-gravel filter layers 5, gravel with good roundness of 2-3 mm is adopted in the sand-gravel filter layers 5, the sand-gravel filter layers are continuously and gradually and evenly put in along the edge of a well hole in a rotating mode in a single direction, the filled sand-gravel filter layers 5 are guaranteed to be more uniform, and the situation that the height difference of the upper ends of annular gravel layers is large is avoided.
The lengths of the sand-free concrete filter pipe 1 and the bridge filter pipe 3 can be adjusted according to stratum conditions. Therefore, the pipe well structure can be better adapted to geological conditions, the bridge type water filtering pipe 3 is arranged in coarse-grained soil, the non-sand concrete pipe 1 is arranged in fine-grained soil, and the dewatering efficiency of the dewatering well is improved.
The diameter of the pipe well bore 6 is 300-400 mm larger than that of the bridge type water filtering pipe 3, so that the sand-free concrete water filtering pipe 1 and the bridge type water filtering pipe 3 can be conveniently installed in a descending mode after the construction of the pipe well bore 6 is completed.
The combined dewatering well structure is safe and reliable, the sand-free concrete water filter pipe 1 and the bridge-type water filter pipe 3 are arranged in the well hole 6, and the sand-free concrete water filter pipe 1, the bridge-type water filter pipe 3 and the well hole 6 are filled with the sand-pebble filter material layer 5, so that the problems of low dewatering efficiency and engineering cost waste of a single well structure in a coarse-grained soil and fine-grained soil interbedded stratum can be well solved, the safety and quality of foundation pit engineering can be ensured, and the combined dewatering well structure can be used for dewatering construction of ultra-large and ultra-deep foundation pit engineering with high ground water level and coarse-grained soil and fine-grained soil strata.
Claims (8)
1. The combined dewatering well structure is arranged on a coarse soil layer and is characterized by comprising a sand-free concrete water filtering pipe, a bridge type water filtering pipe and a sand pebble filtering layer; the sand-free concrete filter pipe is arranged in the fine-grained soil layer, the bridge-type filter pipe is arranged in the coarse-grained soil layer, and the sand pebble filter material layer is arranged between the sand-free concrete filter pipe and the fine-grained soil layer and between the bridge-type filter pipe and the coarse-grained soil layer.
2. The modular dewatering well structure of claim 1, wherein the pipe well bore diameter is 300-400 mm greater than the bridge filter diameter.
3. The modular dewatering well structure of claim 1, wherein the length of the sand-free concrete filter is the same as the thickness of the fine soil layer and the bridge filter is the same as the thickness of the coarse soil layer.
4. The modular dewatering well structure of claim 1, wherein the outer wall of the sand-free concrete filter is coated with nylon filter screen and geotextile.
5. The modular dewatering well structure of claim 1, wherein when the sand-free concrete filter is positioned at the bottommost portion of the formation, a bottom hole plug is positioned at the bottom of the sand-free concrete filter, and the bottom hole plug is made of the same material as the sand-free concrete filter.
6. The modular dewatering well structure of claim 1, wherein the top and bottom ends of the bridge filter are provided with a clamp, the clamp being fixedly connected to the bridge filter.
7. The modular dewatering well structure of claim 6, wherein the clip is welded to the bridge filter.
8. The combination dewatering well structure according to any one of claims 1-7, wherein the sandy pebble filter layer is 2-3 mm gravel, which is evenly distributed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223396794.7U CN218933180U (en) | 2022-12-19 | 2022-12-19 | Combined precipitation well structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223396794.7U CN218933180U (en) | 2022-12-19 | 2022-12-19 | Combined precipitation well structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218933180U true CN218933180U (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223396794.7U Active CN218933180U (en) | 2022-12-19 | 2022-12-19 | Combined precipitation well structure |
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| Country | Link |
|---|---|
| CN (1) | CN218933180U (en) |
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2022
- 2022-12-19 CN CN202223396794.7U patent/CN218933180U/en active Active
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