CN108824465B - Foundation pit engineering dewatering construction structure and construction method - Google Patents
Foundation pit engineering dewatering construction structure and construction method Download PDFInfo
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- CN108824465B CN108824465B CN201810943574.0A CN201810943574A CN108824465B CN 108824465 B CN108824465 B CN 108824465B CN 201810943574 A CN201810943574 A CN 201810943574A CN 108824465 B CN108824465 B CN 108824465B
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- precipitation
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- 238000010276 construction Methods 0.000 title claims abstract description 50
- 238000001556 precipitation Methods 0.000 claims abstract description 47
- 239000004576 sand Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- 239000002689 soil Substances 0.000 claims description 19
- 230000009189 diving Effects 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 description 10
- 238000009412 basement excavation Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000005442 atmospheric precipitation Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
Abstract
A foundation pit engineering dewatering construction structure and a construction method comprise the following steps: the system comprises a first well pipe, a second well pipe, a water-resisting layer, a submersible pump, a deep well pump, a precipitation header pipe and a switch valve; the deep-well pump is connected with the dewatering header pipe through the switch valve respectively; the first well pipe is arranged at a first depth and the second well pipe is arranged at a second depth greater than the first depth; the second well pipe is set to be a first pipe diameter, and the first well pipe is set to be a second pipe diameter larger than the first pipe diameter; a space between the first well pipe and the second well pipe forms an annular passage, and a water-resisting layer is arranged in the annular passage; the space below the water-resisting layer is filled with sand; the submersible pump is disposed in the annular passage between the first well pipe and the second well pipe. By the construction structure and the construction method, the number of the distributed wells can be reduced, the construction cost is reduced, and the construction cost is saved.
Description
Technical Field
The invention designs a construction structure and a construction method of an underground foundation of a building engineering.
Background
With the high-speed development of economic construction in China, in order to more fully utilize land, on one hand, high-rise and super high-rise buildings are continuously increased, and on the other hand, people also increasingly utilize underground spaces to build large-scale municipal works such as underground parking lots, large subway stations, underground transformer substations, underground shopping malls, underground civil defense works and the like. No matter the construction of the deep foundation of the high-rise building or the utilization of the underground space, large-scale underground excavation needs to be carried out, and the rapid development of foundation pit engineering is promoted.
In the foundation pit engineering construction process, the foundation pit dewatering technology plays very important effect to the assurance of engineering quality, and the foundation pit dewatering often is an important factor of deciding the success or failure of deep foundation pit engineering. The foundation pit dewatering method is to reduce the underground water level through a well point. The underground water treatment is very important in the construction process of the foundation pit dewatering, collapse and address damage caused by the sand flowing phenomenon can possibly occur if the foundation pit dewatering is not made, and meanwhile, the safety of an adjacent building can be influenced due to the fact that the soil body of the internal foundation pit is greatly displaced.
When carrying out concrete design to foundation ditch precipitation, divide into two parts according to the geological survey result to the aquifer usually: the first layer aquifer is more shallow, for the dive aquifer, the stratum mainly comprises silt and silt, need carry out the drainage when foundation pit precipitation: the second floor is the confined aquifer of deeper, mainly comes from atmospheric precipitation and domestic water's seepage supply, forms the foundation ditch gushing suddenly when excavation of foundation ditch reaches certain degree of depth and need adopt to carry out the decompression precipitation to the confined aquifer.
Among the prior art, to the precipitation of foundation ditch usually adopt and set up the mode of dredging well and step-down well respectively at dive aquifer and confined aquifer, use the well of dredging to dredge the aquifer of dive before the foundation ditch excavation, after the foundation ditch excavation reached the confined aquifer, carry out the decompression through the step-down well to the confined aquifer until foundation ditch intensity accord with the condition. However, the method causes a large number of well pipes in the foundation pit engineering, the construction cost is high, the construction operation process is prolonged, and the construction is inconvenient.
In order to solve the technical problems, the invention patent of 200710041603 provides an improved foundation pit dewatering construction structure, which combines a dewatering well and a depressurization well into a whole, a controllable water stop device is arranged in a well pipe, the controllable water stop device is closed when a diving aquifer is dewatered, and a submersible pump is used for draining water; when a confined aquifer is excavated, the controllable water stop device is started, the submersible pump is taken out, and the deep-well pump is arranged at the bottom for pressure reduction and precipitation. By the method, the number of the distributed wells can be reduced, the construction cost is reduced, and the construction cost is saved. However, in the invention, a controllable water stopping device needs to be arranged in the pipe well to prevent the diving aquifer from pumping water and pumping water to the confined aquifer, the arrangement is complicated, the state of the controllable water stopping device needs to be switched in the process of draining and pressure reduction, the opening and closing are inconvenient, and the submersible pump and the deep well pump need to be replaced.
Disclosure of Invention
The invention provides an improved soft soil foundation layered dewatering construction structure and a construction method, which can realize the combination of a dredging well and a pressure reducing well, and simultaneously do not need to be provided with a controllable water stopping device and replace a submersible pump and a deep well pump.
As an aspect of the present invention, there is provided a soft soil foundation layered precipitation construction structure, including: the system comprises a first well pipe, a second well pipe, a water-resisting layer, a submersible pump, a deep well pump, a precipitation header pipe and a switch valve; the submersible pump and the deep well pump are respectively connected with the dewatering header pipe through switch valves; the first tubular is disposed at a first depth and the second tubular is disposed at a second depth greater than the first depth; the second well pipe is set to be a first pipe diameter, and the first well pipe is set to be a second pipe diameter larger than the first pipe diameter; the second well pipe is arranged in the first well pipe and is concentric with the first well pipe; the space between the first well pipe and the second well pipe forms an annular passage, and the water-resisting layer is arranged in the annular passage; the space below the water-resisting layer is filled with sand; the submersible pump is arranged in the annular passage between the first well pipe and the second well pipe; the deep well pump is arranged in the second well pipe.
Preferably, soft soil foundation layering precipitation construction structures are used for foundation ditch precipitation construction.
Preferably, the first depth corresponds to a depth of a ground-based diving aquifer; the second depth corresponds to a depth of a ground bearing aquifer.
Preferably, the depth of the water-resisting layer is arranged between the diving aquifer and the foundation confined aquifer.
Preferably, the second well pipe comprises a first part and a second part, the first part is a part lower than the water-resisting layer, and the pipe wall of the first part is provided with water through holes; the second part is a part higher than the water-resisting layer, and the pipe wall of the second part is set to be in a sealing state.
Preferably, the pipe wall of the first well pipe is provided with water through holes.
Preferably, the cross-sectional area of the first well pipe is 2 to 3 times of the cross-sectional area of the second well pipe.
Preferably, a first bottom disc surrounding the outer wall of the second well pipe is arranged at the bottom of the second well pipe, and a second bottom disc surrounding the outer wall of the first bottom disc is arranged at a specific position on the first bottom disc; the outer diameters of the first chassis and the second chassis are the same as the pipe diameter of the first well pipe.
As another aspect of the present invention, there is provided a precipitation construction method for the soft soil foundation layered precipitation construction structure, including the steps of: (1) setting a soft soil foundation layered dewatering construction structure; (2) before the foundation pit is excavated, a submersible pump is started to carry out drainage dewatering on a submersible aquifer through a first well pipe; (3) excavating the foundation pit, and after the foundation pit is excavated to the depth required to be depressurized, lowering water to the confined aquifer intermittently through the second well pipe according to the excavation progress, and controlling the underground water level; (4) and finishing excavation of the foundation pit, enabling the structural strength to meet the requirement, and finishing dewatering construction.
Drawings
Fig. 1 is a schematic view of a soft soil foundation layered precipitation construction structure according to an embodiment of the present invention.
Fig. 2 is a schematic view of a soft soil foundation layered precipitation construction structure according to a preferred embodiment of the present invention.
Fig. 3 is a schematic view of another preferred embodiment of the present invention of a stratified precipitation construction of a soft soil foundation.
Detailed Description
In order to more clearly illustrate the technical solutions of the present invention, the present invention will be briefly described below by using embodiments, and it is obvious that the following description is only one embodiment of the present invention, and for those skilled in the art, other technical solutions can be obtained according to the embodiments without inventive labor, and also fall within the disclosure of the present invention.
The soft soil foundation layered precipitation construction structure of the embodiment of the invention, as shown in fig. 1, comprises: a first well pipe 10, a second well pipe 20, a water barrier 30, a submersible pump 40, a deep well pump 50, a precipitation main 60 and on-off valves 70, 80. The first well pipe 10 is used for draining water contained in a diving aquifer before foundation pit construction, and is a circular pipeline, a water through hole is formed in the pipe wall, and the depth is the position of a middle layer of the diving aquifer and a confined aquifer. The first well pipe 10 is filled with a filter material, which may be sand.
The second well pipe 20 is used for depressurization of a confined aquifer, and the bottom thereof is disposed in the confined aquifer. The second well pipe 20 is a circular pipe, is arranged in the first well pipe 10, and is arranged concentrically with the first well pipe 10, and the cross-sectional area of the first well pipe 10 is 2-3 times of the cross-sectional area of the second well pipe 20, so that a precipitation passage 11 for dewatering a submerged aquifer is formed between the first well pipe 10 and the second well pipe 20. The top of the second well pipe 20 is identical to the first well pipe 10, and the depth of the second well pipe 20 is greater than the depth of the first well pipe 10 and is disposed in a pressurized water-containing layer. The bottom of the second well pipe 20 is provided with a water barrier layer 23, and the water barrier layer 23 may be a clay impermeable layer, for example.
A water barrier 30 is provided on the bottom of the first casing 10 and outside the outer ring of the second casing 20, and the depth of the water barrier 30 is set between a diving aquifer and a confined aquifer. The water barrier 30 may be provided as a clay barrier, for example.
The second well pipe 20 comprises a first part 21 and a second part 22, wherein the first part 21 is a part lower than the water-resisting layer 30, and the pipe wall of the first part is provided with water through holes for introducing water of a confined aquifer; the second section 22 is a section above the water barrier 30, the walls of which are arranged in a sealed condition. The second well pipe 20 forms a precipitation channel 24 for a confined aquifer.
The submersible pump 40 is arranged in the annular precipitation channel 11 between the first well pipe 10 and the second well pipe 20 for draining the water contained in the submerged aquifer of the foundation pit. The submersible pump 40 communicates with the precipitation manifold 60 through the on-off valve 70. The deep well pump 50 is arranged in the precipitation channel 24 in the second well pipe 20 for precipitating the confined aquifer. The deep well pump 50 communicates with the precipitation manifold 60 through a switch valve 80.
The soft soil foundation layered precipitation construction structure provided by the embodiment of the invention can be used for arranging the filter material layer in the precipitation channel so as to filter precipitation before the submersible pump 40 or the deep well pump 50.
The construction method of the soft soil foundation layered precipitation construction structure comprises the following steps: (1) paying off and positioning; (2) laying a precipitation header pipe; (3) flushing a high-pressure water gun into a first depth and a first pipe diameter by water, wherein the first pipe diameter is 10 pipe diameters of a first well pipe, and the first depth is 20 pipe diameters of a second well pipe; (4) paving a waterproof layer 23; (5) arranging the second well pipe 20 in the center, and filling coarse sand outside the second well pipe 20 in a layering manner to the position of the middle layer of the diving aquifer and the confined aquifer; (6) laying a water-resisting layer 30 at the middle layer position outside the second well pipe 20; (7) the first well pipe 10 is arranged in the middle of the water-resisting layer 30, preferably, a fixed layer with a certain thickness can be filled in the water-resisting layer 30, and the first well pipe 10 is fixed on the fixed layer; (8) the outside of the first well pipe 10 is filled with grit in layers until the top of the first well pipe 10 is approached, and preferably, a seal section can be arranged on the top of the first well pipe 10; (9) a deep well pump 50 is arranged in the second well pipe 20; (10) arranging a submersible pump 40 in an annular precipitation channel between the first well pipe 10 and the second well pipe 20; (11) connecting a first well pipe 10 and a second well pipe 20 by using bent pipes respectively; (12) connected to the precipitation mains via on-off valves 70 and 80 respectively.
The precipitation construction method of the soft soil foundation layered precipitation construction structure comprises the following steps: (1) setting a soft soil foundation layered dewatering construction structure; (2) before excavation of a foundation pit, starting a submersible pump 40 to carry out dewatering precipitation on a submerged aquifer through a first well pipe 10; (3) excavating the foundation pit, starting a deep well pump 50 to intermittently reduce water to the confined aquifer through a second well pipe 20 according to the excavation progress after the foundation pit is excavated to the depth needing pressure reduction, and controlling the underground water level; (4) and finishing excavation of the foundation pit, enabling the structural strength to meet the requirement, and finishing dewatering construction.
Through the arrangement of the embodiment of the invention, the separate treatment of the diving water and the confined water is realized in the same pipe well, and meanwhile, a controllable water stopping device is not required to be arranged, the diving water and the confined water are not influenced mutually in the precipitation process, and the replacement of a diving pump and a deep well pump is not required.
In a preferred embodiment of the invention, as can be seen in fig. 2, a first bottom plate 25 surrounding the outer wall of the second well pipe 20 is provided at the bottom thereof, and a second bottom plate 26 surrounding the outer wall thereof is provided at a specific position on the first bottom plate 25; the first bottom disc 25 and the second bottom disc 26 may be fixed to the second well pipe 20 by a threaded connection. The first and second bottom discs 25, 26 have the same outer diameter as the pipe diameter of the first well pipe 10. Through such setting, can carry out the precipitation at the dive aquifer, fixed second well casing 20 avoids it to appear offset and influences the foundation ditch precipitation.
In a further preferred embodiment of the present invention, referring to fig. 3, the water barrier 30 comprises a left side portion 31 and a right side portion 32, the submersible pump 40 is disposed on the left side portion 31, and the heights of the left side portion 31 and the right side portion 32 of the water barrier 30 are set such that the height of the right side portion 32 is higher than the height of the left side portion 31, so that the water in the precipitation channel 24 can reach the position of the submersible pump 40 sufficiently, and the drainage of the submersible pump 40 is further promoted.
The invention has been described above with reference to specific exemplary embodiments. It will be apparent to those skilled in the art that appropriate substitutions or modifications may be made without departing from the scope of the invention. The exemplary embodiments are merely illustrative, and not restrictive of the scope of the invention, which is defined by the appended claims.
All documents referred to herein are incorporated by reference into this application as if each were individually incorporated by reference. Furthermore, it should be understood that after reading the above disclosure of the present invention, the scope of the present invention is not limited to the above embodiments, and those skilled in the art can make various changes or modifications to the present invention without departing from the principle of the present invention, and these equivalents also fall within the scope of the present invention as defined by the appended claims.
Claims (3)
1. The utility model provides a soft soil foundation layering precipitation construction structures, includes: the system comprises a first well pipe, a second well pipe, a water-resisting layer, a submersible pump, a deep well pump, a precipitation header pipe and a switch valve; the submersible pump and the deep well pump are respectively connected with the dewatering header pipe through switch valves; the first tubular is disposed at a first depth and the second tubular is disposed at a second depth greater than the first depth; the second well pipe is set to be a first pipe diameter, and the first well pipe is set to be a second pipe diameter larger than the first pipe diameter; the first well pipe is used for dewatering precipitation of a diving aquifer; the second well pipe is used for carrying out precipitation on a confined aquifer; the pipe wall of the first well pipe is provided with a water through hole; the second well pipe comprises a first part and a second part, the first part is a part lower than the water-resisting layer, and the pipe wall of the first part is provided with a water through hole; the second part is a part higher than the water-resisting layer, and the pipe wall of the second part is set in a sealing state; the first depth corresponds to a depth of a ground-based submersible aquifer; the second depth corresponds to a depth of a ground bearing aquifer; the second well pipe is arranged in the first well pipe and is concentric with the first well pipe; the space between the first well pipe and the second well pipe forms an annular passage, and the water-resisting layer is arranged in the annular passage; the depth of the waterproof layer is arranged in the middle layer between the diving aquifer and the foundation confined aquifer; the space below the water-resisting layer is filled with sand; the submersible pump is arranged in the annular passage between the first well pipe and the second well pipe; the deep-well pump is arranged in the second well pipe; a first base plate surrounding the outer wall of the second well pipe is arranged at the bottom of the second well pipe, and a second base plate surrounding the outer wall of the first base plate is arranged at a specific position on the first base plate; the outer diameters of the first chassis and the second chassis are the same as the pipe diameter of the first well pipe.
2. A soft soil foundation layering precipitation construction structure of claim 1, characterized in that: the soft soil foundation layering precipitation construction structure is used for foundation pit precipitation construction.
3. A soft soil foundation layered precipitation construction method for performing precipitation construction by the soft soil foundation layered precipitation construction structure according to any one of claims 1 to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810943574.0A CN108824465B (en) | 2017-04-16 | 2017-04-16 | Foundation pit engineering dewatering construction structure and construction method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710246596.7A CN106894429B (en) | 2017-04-16 | 2017-04-16 | Base pit engineering soft soil foundation is layered dewatering construction structure and construction method |
| CN201810943574.0A CN108824465B (en) | 2017-04-16 | 2017-04-16 | Foundation pit engineering dewatering construction structure and construction method |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710246596.7A Division CN106894429B (en) | 2017-04-16 | 2017-04-16 | Base pit engineering soft soil foundation is layered dewatering construction structure and construction method |
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| Publication Number | Publication Date |
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| CN108824465A CN108824465A (en) | 2018-11-16 |
| CN108824465B true CN108824465B (en) | 2020-12-08 |
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| CN201810943574.0A Active CN108824465B (en) | 2017-04-16 | 2017-04-16 | Foundation pit engineering dewatering construction structure and construction method |
| CN201710246596.7A Active CN106894429B (en) | 2017-04-16 | 2017-04-16 | Base pit engineering soft soil foundation is layered dewatering construction structure and construction method |
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| CN113957917B (en) * | 2021-11-11 | 2023-03-31 | 同济大学 | Taiji type internal partition wall one-hole multi-channel mixing well |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3338909B2 (en) * | 1994-01-19 | 2002-10-28 | 清水建設株式会社 | Layered pumping well |
| CN100480475C (en) * | 2007-06-04 | 2009-04-22 | 上海地矿工程勘察有限公司 | Controllable one-well lamina precipitation construction method |
| CN100516380C (en) * | 2007-06-07 | 2009-07-22 | 上海交通大学 | Method for lowering water by combining phreatic water in footing groove with artesian aquifer - well stratifications |
| CN101363228A (en) * | 2008-05-23 | 2009-02-11 | 上海广联建设发展有限公司 | Tube well for simultaneously dewatering and decompressing and technology thereof |
| CN102518141B (en) * | 2011-12-19 | 2013-12-25 | 同济大学 | Deep foundation pit dewatering and decompressing combination well controlled in subsection manner |
| CN203768924U (en) * | 2014-02-19 | 2014-08-13 | 中亿丰建设集团股份有限公司 | Tubular well used for simultaneously draining and decompressing precipitation |
| CN203729314U (en) * | 2014-02-28 | 2014-07-23 | 华南理工大学 | Anti-floating relief well |
| CN205444219U (en) * | 2015-12-29 | 2016-08-10 | 上海广联环境岩土工程股份有限公司 | Precipitation tubular well that decompression was held concurrently to foundation ditch dry out |
| CN206090597U (en) * | 2016-09-28 | 2017-04-12 | 上海广联环境岩土工程股份有限公司 | Haplopore multitube tubular well |
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| CN106894429B (en) | 2019-03-01 |
| CN106894429A (en) | 2017-06-27 |
| CN108824465A (en) | 2018-11-16 |
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