CN217651830U - A precipitation tubular well for subway station foundation ditch - Google Patents
A precipitation tubular well for subway station foundation ditch Download PDFInfo
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- CN217651830U CN217651830U CN202221392879.5U CN202221392879U CN217651830U CN 217651830 U CN217651830 U CN 217651830U CN 202221392879 U CN202221392879 U CN 202221392879U CN 217651830 U CN217651830 U CN 217651830U
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Abstract
A downcast pipe well for subway station foundation ditch to control the sand content of pumping effectively, avoid peripheral ground too big settlement or crack to appear, and simple structure, construction convenience. The underground water-filtering-type underground water-filtering-well structure comprises a water-lowering well arranged outside a foundation pit and a concrete water-filtering pipe extending along the axis in the water-lowering well, wherein clay is filled and compacted at a certain depth from the ground to form a closed section, a filtering material is filled below the closed section, a water inlet section is formed between the terminal of the closed section and the lower port of the concrete water-filtering pipe, the lower port of the concrete water-filtering pipe is closed by a plunger, and a sand-settling section is formed between the water inlet section and the bottom of the water-lowering well; the lower part of the water inlet section crosses the bottom surface line of the foundation pit to a certain depth, and the outer peripheral wall of the concrete water filter pipe in the range of the water inlet section L2 is wrapped with a nylon net.
Description
Technical Field
The utility model relates to a civil engineering, in particular to downcast pipe well for subway station foundation ditch.
Background
At present, domestic subway is developing fast, and the subway station that is located urban district adopts underground station more, and the station foundation ditch degree of depth is darker, for guaranteeing the dry construction condition of foundation ditch, and the foundation ditch adopts to set up the stagnant water curtain stagnant water more or adopts to set up precipitation well and reduces the ground water level. In a sandy gravel stratum, a pit outer pipe well is mostly adopted for lowering the underground water level in a foundation pit.
Disclosed in utility model patent specification of publication number CN 214883779U is a downcomer well and downcomer well structure, this downcomer well device includes: the downcomer component comprises a connecting pipe, and the connecting pipe is inserted in the construction layer along a first direction and is communicated with a cement downcomer arranged in the construction layer; the plugging cover plate component comprises a grouting pipe, wherein at least part of the grouting pipe penetrates through the connecting pipe and is communicated with the cement downcomer pipe; wherein, the slip casting pipe can be simultaneously to cement precipitation pipe and connecting pipe slip casting in order to shutoff cement precipitation pipe. The blocking cover plate component forms a blocking layer in a mode of simultaneously grouting to the cement precipitation pipe and the connecting pipe through the grouting pipe, so that the grouting time is shortened, the forming time of the blocking layer is shortened, the blocking efficiency is improved, and the blocking difficulty of the precipitation pipe well is further reduced.
The existing dewatering well has the defects of complex structure and inconvenient construction, and the common dewatering well is easy to bring out fine sand in a pebble soil layer in the dewatering process, so that the ground surrounding a foundation pit is settled, and great potential safety hazards are brought to the foundation pit construction.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a downcast pipe well for subway station foundation ditch is provided to control the sand content of drawing water effectively, avoid peripheral ground too big settlement or crack to appear, and simple structure, construction convenience.
The utility model provides a technical scheme that its technical problem adopted as follows:
the utility model discloses a precipitation well for subway station foundation ditch, including setting up at the precipitation well in the foundation ditch outside, along the concrete strainer pipe that its axis extends in the precipitation well, characterized by: in the precipitation well, clay is filled and compacted at a certain depth from the ground to form a closed section, filter materials are filled below the closed section, a water inlet section is formed between the terminal of the closed section and the lower end of the concrete water filter pipe, the lower end of the concrete water filter pipe is closed by a plunger, and a sand setting section is formed between the water inlet section and the bottom of the precipitation well; the lower part of the water inlet section crosses the bottom surface line of the foundation pit to a certain depth, and the outer peripheral wall of the concrete water filter pipe in the range of the water inlet section L2 is wrapped with a nylon net.
The utility model has the advantages that the sand content of pumped water can be effectively controlled, and the excessive settlement or cracks on the surrounding ground can be avoided; the dewatering pipe well is simple in structure, convenient to construct and low in engineering cost.
Drawings
The specification includes the following three drawings:
fig. 1 is a schematic structural view of a downcomer well for a subway station foundation pit of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a sectional view of a concrete strainer in a downcomer well for a subway station foundation pit.
The figures show the components and corresponding references: the water filter comprises a closed section L1, a water inlet section L2, a sand setting section L3, a concrete water filter pipe 10, a nylon net 11, a water permeable hole 12, clay 20, a filter material 30, a plunger 40, the ground D and a foundation pit bottom surface J.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Referring to fig. 1 and 2, the utility model discloses a precipitation well for subway station foundation ditch, including setting up at the precipitation well in the foundation ditch outside, along the concrete strainer 10 of its axis extension in the precipitation well. In the precipitation well, a closed section L1 is formed by filling and tamping clay 20 downwards at a certain depth from the ground D, a filter material 30 is filled below the closed section L1, a water inlet section L2 is formed between the terminal of the closed section L1 and the lower end opening of the concrete strainer 10, the lower end opening of the concrete strainer 10 is closed by a plunger 40, and a sand setting section L3 is formed between the water inlet section L2 and the bottom of the precipitation well. The lower part of the water inlet section L2 crosses the foundation pit bottom surface line J by a certain depth, and the outer peripheral wall of the concrete water filter pipe 10 in the range of the water inlet section L2 is wrapped with a nylon net 11.
Referring to the embodiment shown in fig. 1, the closed section L1 has a length from the ground surface D to 3m below the ground surface. The length of the water inlet section L2 is from the closed section L1 to a distance below a foundation pit bottom surface line J, a nylon net 11 with the aperture of 40 meshes is coated outside the concrete strainer 10, and a filter material 30 with the particle size of 2-8 mm is backfilled in the range of the water inlet section L2, wherein the filter material 30 meets the grading requirement. The length of the sand setting section L3 is 3m, the main function is sand setting, and the plunger 40 can adopt a closed cement pipe.
Referring to fig. 3, the pipe wall of the concrete strainer 10 is distributed with water permeable holes 12, and the ratio of the sum of the areas of the water permeable holes 12 to the surface area of the pipe wall of the water inlet section L2 is 4-8%.
Referring to fig. 1, the utility model discloses a work progress of precipitation well for subway station foundation ditch as follows:
1. construction preparation, namely determining the well position of the dewatering pipe well;
2. the drilling machine is positioned, the hole is drilled to the designed depth, and the hole is cleaned;
3. installing a concrete water filter pipe 10, wherein water permeable holes are formed in the concrete water filter pipe 10 according to the water inlet area ratio, and a nylon net 11 is wrapped on the concrete water filter pipe 10 within the range of a water inlet section L2;
4. the sealing joint at the bottom end of the concrete water filter pipe 10 is required to be firm to prevent sand return;
5. a filter material 30 is filled between the well wall and the concrete water filter pipe 10 between the starting end of the water inlet section L2 and the well bottom;
6. filling clay 20 from the ground D to the starting end of the water inlet section L2 and tightly sealing to form a closed section L1;
7. sinking a submersible pump in the concrete water filter pipe 10, and trying to pump water to check whether the well pipe leaks water or whether the water pump rotates reversely;
8. monitoring normal water pumping;
9. and after the precipitation construction is finished, backfilling the precipitation well and restoring the ground.
The above is only used for illustrating the principles of the dewatering well for the subway station foundation pit, not to limit the utility model to the specific structure and the application range, so all the corresponding modifications and equivalents that may be utilized all belong to the patent scope applied by the utility model.
Claims (3)
1. The utility model provides a precipitation well for subway station foundation ditch, including set up at the precipitation well in the foundation ditch outside, along concrete strainer pipe (10) that its axis extends in the precipitation well, characterized by: in the precipitation well, a closed section (L1) is formed by filling rammed clay (20) downwards from the ground (D) to a certain depth; a filter material (30) is filled below the closed section (L1), a water inlet section (L2) is formed between the terminal of the closed section (L1) and the lower port of the concrete strainer (10), the lower port of the concrete strainer (10) is closed by a plunger (40), and a sand setting section (L3) is formed between the water inlet section (L2) and the bottom of the precipitation well; the lower part of the water inlet section (L2) crosses the foundation pit bottom surface line (J) by a certain depth, and the outer peripheral wall of the concrete water filter pipe (10) is wrapped with a nylon net (11) in the range of the water inlet section (L2).
2. The dewatering well for the foundation pit of the subway station as claimed in claim 1, wherein: the pipe wall of the concrete water filter pipe (10) is distributed with water permeable holes (12), and the ratio of the area of each water permeable hole (12) to the pipe wall surface area of the water inlet section (L2) is 4-8%.
3. The dewatering well for the foundation pit of the subway station as claimed in claim 1, wherein: the aperture of the nylon net (11) is 40 meshes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221392879.5U CN217651830U (en) | 2022-06-02 | 2022-06-02 | A precipitation tubular well for subway station foundation ditch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221392879.5U CN217651830U (en) | 2022-06-02 | 2022-06-02 | A precipitation tubular well for subway station foundation ditch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217651830U true CN217651830U (en) | 2022-10-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221392879.5U Active CN217651830U (en) | 2022-06-02 | 2022-06-02 | A precipitation tubular well for subway station foundation ditch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217651830U (en) |
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2022
- 2022-06-02 CN CN202221392879.5U patent/CN217651830U/en active Active
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