CN112523239A - Foundation pit gas lift reverse circulation dewatering device and method - Google Patents
Foundation pit gas lift reverse circulation dewatering device and method Download PDFInfo
- Publication number
- CN112523239A CN112523239A CN202011502080.2A CN202011502080A CN112523239A CN 112523239 A CN112523239 A CN 112523239A CN 202011502080 A CN202011502080 A CN 202011502080A CN 112523239 A CN112523239 A CN 112523239A
- Authority
- CN
- China
- Prior art keywords
- pipe
- water
- hollow pipe
- hollow
- foundation pit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 92
- 239000010813 municipal solid waste Substances 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 238000001556 precipitation Methods 0.000 claims description 28
- 230000000694 effects Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 7
- 238000005086 pumping Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000009430 construction management Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005370 electroosmosis Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
- B01D29/54—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
Abstract
The invention discloses a foundation pit gas lift reverse circulation dewatering device and a method, wherein the top of a hollow cylindrical steel pipe is provided with a water outlet which is communicated with the inside and the outside of the hollow pipe, and the water outlet is used for being connected with a water outlet pipe; a plurality of through holes communicated with the outside are uniformly distributed on the bottom wall of the hollow pipe; a trash rack is arranged outside the bottom of the hollow pipe and communicated with the through hole; the lower part of one side of the hollow pipe is communicated with an air inlet pipe, an air outlet of the air inlet pipe is positioned in the hollow pipe and faces to the bottom wall of the hollow pipe, and an air inlet of the air inlet pipe is positioned outside the hollow pipe and is communicated with an air compressor; a water stop gasket is arranged between the air outlet of the air inlet pipe and the bottom wall of the hollow pipe, and the water stop gasket is laid on the bottom wall of the hollow pipe in a separable mode and covers all the through holes. The invention is energy-saving and environment-friendly, and effectively realizes foundation pit dewatering.
Description
Technical Field
The invention relates to the technical field of subway construction, in particular to a foundation pit gas lift reverse circulation dewatering device and a foundation pit gas lift reverse circulation dewatering method.
Background
In the excavation process of the foundation pit of the subway station, in order to ensure that the foundation pit can be constructed under a dry condition and prevent the problems of instability of a side slope, basic quicksand, uplift of the pit bottom, piping at the pit bottom, reduction of the bearing capacity of a foundation and the like, precipitation work is necessary preparation work before excavation of the foundation pit. It is generally required that the water line must be lowered to a position 1m below the excavation face of the foundation pit. The current foundation pit dewatering method mainly comprises the following steps: open ditch with water collecting well dewatering, light well point dewatering, jet well point dewatering, electroosmosis well point dewatering, deep well point dewatering, etc. The deep well point dewatering process is simple and is widely applied. The effectiveness of well-point precipitation depends on three factors: 1. the structural design and construction of the pipe well can ensure certain permeation, prevent mud and sand outside the well from entering the pipe well to block the pipe well and a water pump, and ensure long-term effective utilization of the pipe well; 2. the special person is responsible for pumping water, so that the water pump is prevented from being burnt dry, and the continuous and efficient pumping operation is ensured; 3. and attention is paid to protecting the pipe well in the earthwork excavation process, and the pipe well is prevented from being invalid due to the fact that muck falls into the pipe well.
The main immersible pump that uses of current well casing precipitation pump drainage mode has the main problem:
1. a large amount of rock debris and mud blocks exist in the well forming process, the depth of a water well is large, mud is large in the well forming process, sundries such as the rock debris and the mud blocks at the bottom of the well cannot be completely cleaned by a common deep water well pump, a pipe well is easily blocked in the using process, and the seepage of underground water into the well pipe and the water pumping utilization rate are reduced.
2. In the prior well pipe precipitation, a submersible pump is adopted to pump and discharge accumulated water in a well, and people are required to continuously watch the well by means of manual control (starting/stopping the submersible pump), otherwise, the water pump is easy to idle after the water in the well is pumped to be dry, so that the damage is caused; in addition, the wires are randomly connected and pulled in the construction site, which affects the safety of operators and the civilized construction management.
3. The energy consumption is big, to very large-scale foundation ditch, will set up dozens of precipitation wells in the place, and single well intraductal precipitation all need dispose an independent water pump, if need continuously draw water, and power consumption is great.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a foundation pit gas lift reverse circulation dewatering device and a foundation pit gas lift reverse circulation dewatering method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a foundation pit gas lift reverse circulation dewatering device comprises a hollow pipe, wherein the top of the hollow pipe is provided with a water outlet which is communicated with the inside and the outside of the hollow pipe, and the water outlet is used for being connected with a water outlet pipe; a plurality of through holes communicated with the outside are uniformly distributed on the bottom wall of the hollow pipe; a trash rack is arranged outside the bottom of the hollow pipe and communicated with the through hole; the lower part of one side of the hollow pipe is communicated with an air inlet pipe, an air outlet of the air inlet pipe is positioned in the hollow pipe and faces to the bottom wall of the hollow pipe, and an air inlet of the air inlet pipe is positioned outside the hollow pipe and is communicated with an air compressor; and a water stop gasket is arranged between the air outlet of the air inlet pipe and the bottom wall of the hollow pipe, and the water stop gasket is laid on the bottom wall of the hollow pipe in a separable mode and covers all the through holes.
Furthermore, in the device, the area of each through hole is 0.004 square meters.
Furthermore, in the above device, the water stop gasket is made of a plastic material.
Further, among the above-mentioned device, utilize the air supply hose intercommunication the air inlet and the air compressor machine of intake pipe, the one end that the air supply hose is close to the air compressor machine is equipped with the pneumatic electromagnetic switch of normal close.
Further, in the device, the hollow pipe is a hollow cylindrical steel pipe.
Further, the device also comprises a stopping device, and the stopping device is positioned above the water stop gasket.
The invention also provides a method for utilizing the foundation pit gas lift reverse circulation dewatering device, which specifically comprises the following steps:
after the water outlet is connected with the water outlet pipe, the foundation pit gas-lift reverse circulation dewatering device is integrally arranged in the dewatering well pipe until the foundation pit gas-lift reverse circulation dewatering device reaches the bottom of the dewatering well pipe; when the air compressor is not started to add air, the water-stopping gasket is in a loosened state, the pressure in the hollow pipe is far smaller than that in the precipitation well pipe, accumulated water outside the hollow pipe sequentially passes through the dirt blocking grating and the through hole under the action of pressure difference, and the water-stopping gasket is jacked and enters the hollow pipe to form a water column until the pressure inside and outside the hollow pipe is balanced;
after the air compressor is started to add air, the air flow enters the hollow pipe, the air flow and the water column form a water-air mixture in the hollow pipe, and the water-air mixture flows to the outside of the hollow pipe under the action of pressure difference, so that the water is pumped out along the water outlet and the water outlet pipe;
after drawing water and accomplishing, stop the air compressor machine, be in the state of unclamping once more after the pressure effect that the stagnant water gasket loses atmospheric pressure, hollow tube internal pressure is less than precipitation well pipe internal pressure far away this moment, and hollow tube outside ponding enters the inside water column that forms of hollow tube once more under the effect of pressure differential, until the inside and outside pressure balance of hollow tube, draws water once more.
The invention has the beneficial effects that: the invention provides pneumatic power by using the air compressor, can directly replace a water pump used in the existing well pipe dewatering, thoroughly changes the existing pumping mode, effectively enables the water level in the dewatering well to be within 40cm of the well bottom, enables the depth of the dewatering well to be only 1-2m deeper than the excavation depth of the foundation pit, enables the water level of the foundation pit to be lower than the excavation surface, and solves the problems of high labor cost, large energy consumption and the like of the existing pumping mode. In addition, in the process of gas lift reverse circulation use, the rock debris with large particle size is isolated outside the hollow pipe through the dirt blocking grating and cannot enter the hollow pipe in a turbulent manner, and after debris such as rock debris with small particle size, mud blocks and the like enter the hollow pipe, the rock debris with small particle size is directly discharged out of the pipeline along with slurry discharge through the gas lift effect and is cleaned, so that well pipes are not easy to block. The invention is energy-saving and environment-friendly, and can be beneficial to civilized construction management of a precipitation construction site.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a usage status of the apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
The embodiment provides a foundation pit gas lift reverse circulation precipitation device, which comprises a hollow pipe 1, wherein a water outlet 2 for communicating the inside and the outside of the hollow pipe 1 is arranged at the top of the hollow pipe 1, and the water outlet 2 is used for connecting a water outlet pipe; a plurality of through holes 3 communicated with the outside are uniformly distributed on the bottom wall of the hollow pipe 1; a trash rack 4 is arranged outside the bottom of the hollow pipe 1, and the trash rack 4 is communicated with the through hole 3; the lower part of one side of the hollow pipe 1 is communicated with an air inlet pipe 5, an air outlet of the air inlet pipe 5 is positioned in the hollow pipe 1 and faces the bottom wall of the hollow pipe 1, and an air inlet of the air inlet pipe 5 is positioned outside the hollow pipe 1 and is communicated with an air compressor 6; be equipped with stagnant water gasket 7 and backstop device 8 between the gas outlet of intake pipe 5 and the diapire of hollow tube 1, stagnant water gasket 7 is laid separately on the diapire of hollow tube 1 and cover all through-holes 3, backstop device 8 is located stagnant water gasket 7's top.
In this embodiment, the stop means 8 comprises two intersecting steel cables fixed about 5cm above the water stop gasket 7.
In this embodiment, the hollow tube 1 is a hollow cylindrical steel tube.
The working principle of the foundation pit gas lift reverse circulation dewatering device is as follows: as shown in fig. 2, after the water outlet is connected to the water outlet pipe 100, the whole foundation pit gas-lift reverse circulation precipitation device is placed in the precipitation well pipe 200 until it reaches the bottom of the precipitation well pipe 200. When the air compressor 6 is not started to add air, the water stop gasket 7 is in a loosening state, the pressure in the hollow pipe 1 is far smaller than the pressure in the precipitation well pipe 200, accumulated water in the outer side of the hollow pipe 1 sequentially passes through the trash rack 4 and the through hole 3 under the action of pressure difference, the water stop gasket 7 is jacked and enters the hollow pipe 1 to form a water column until the pressure in the hollow pipe 1 is balanced with the pressure in the outside.
When the air compressor is not started to add air, the water pressure inside and outside the hollow pipe is consistent, and the water pressure is the external atmospheric pressure. After the air compressor is started to add air, a large amount of gas instantly flows into the hollow pipe, the air flow and the water form a water-gas mixture, meanwhile, the pressure in the pipe is increased, and the water-gas mixture is pushed by the high-pressure high-speed air flow to be sprayed out along the water outlet and the water outlet pipe.
After drawing water and accomplishing, stop the air compressor machine, the stagnant water gasket loses the effect of atmospheric pressure and is in the state of loosening once more, and hollow tube internal pressure is less than precipitation well pipe internal pressure far away this moment, and hollow tube outside ponding enters the inside water column that forms of hollow tube once more under the effect of pressure differential, and until the inside and outside pressure balance of hollow tube, the above-mentioned process of can repeating once more is drawn water.
The trash rack can block broken stones with large particle sizes from entering the hollow pipe, so that water outlets are prevented from being blocked, and the water stop gasket can prevent gas from leaking outwards from the through holes.
The stop device 8 is used for controlling the loosening distance of the water stop gasket 7 and preventing the water stop gasket from excessively deviating from the original position under the upward jacking force of accumulated water on the outer side.
In this embodiment, each through hole 3 has an area of 0.004 square meter.
In this embodiment, the water stop gasket 7 is made of a soft plastic material.
In this embodiment, an air supply hose 9 is used to communicate the air inlet of the air inlet pipe 5 with the air compressor 6, and one end of the air supply hose 9 close to the air compressor 6 is provided with a normally closed pneumatic electromagnetic switch 10. The normally closed pneumatic electromagnetic switch is used for conducting or preventing high-pressure airflow from entering the hollow pipe.
In particular toThe air supply pressure of the air compressor is 0.8-1Mpa, and the air supply quantity required by the single foundation pit air lift reverse circulation precipitation device is 1-2m3/min。
In this embodiment, the radius of the hollow pipe is 0.1m, the height is 0.8m, the shape and size of the top surface of the trash rack is matched with the bottom wall of the hollow pipe, and the height of the trash rack is 0.2 m.
In practical application, aiming at excavation of a foundation pit, a construction site can be provided with a plurality of dewatering wells for dewatering simultaneously, so that all dewatering well pipes in the foundation pit can provide high-pressure air through a unified air compressor, the working states of all the dewatering well pipes are controlled through different normally closed pneumatic electromagnetic switches, and meanwhile, all pumping and draining water at a water outlet enters a sedimentation tank and other water treatment and slurry treatment pipelines through pipelines to be used as circulating water for construction, circulating slurry making water for diaphragm wall construction and the like for cyclic utilization.
Various corresponding changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.
Claims (7)
1. The foundation pit gas lift reverse circulation dewatering device is characterized by comprising a hollow pipe (1), wherein a water outlet (2) communicated with the inside and the outside of the hollow pipe (1) is formed in the top of the hollow pipe (1), and the water outlet (2) is used for being connected with a water outlet pipe; a plurality of through holes (3) communicated with the outside are uniformly distributed on the bottom wall of the hollow pipe (1); a trash rack (4) is arranged outside the bottom of the hollow pipe (1), and the trash rack (4) is communicated with the through hole (3); the lower part of one side of the hollow pipe (1) is communicated with an air inlet pipe (5), an air outlet of the air inlet pipe (5) is positioned in the hollow pipe (1) and faces the bottom wall of the hollow pipe (1), and an air inlet of the air inlet pipe (5) is positioned outside the hollow pipe (1) and is communicated with an air compressor (6); be equipped with stagnant water gasket (7) between the gas outlet of intake pipe (5) and the diapire of hollow tube (1), stagnant water gasket (7) are laid separately on the diapire of hollow tube (1) and cover all through-holes (3).
2. The foundation pit gas lift reverse circulation precipitation device according to claim 1, wherein the area of each through hole (3) is 0.004 square meter.
3. The foundation pit gas lift reverse circulation precipitation device according to claim 1, characterized in that the water-stop gasket (7) is made of plastic material.
4. The foundation pit gas lift reverse circulation precipitation device according to claim 1, characterized in that an air inlet of the air inlet pipe (5) is communicated with the air compressor (6) through an air supply hose (9), and one end, close to the air compressor (6), of the air supply hose (9) is provided with a normally closed pneumatic electromagnetic switch (10).
5. The foundation pit gas lift reverse circulation precipitation device according to claim 1, characterized in that the hollow pipe (2) is a hollow cylindrical steel pipe.
6. The foundation pit gas lift reverse circulation precipitation device according to claim 1, characterized in that a stop device (8) is further included, and the stop device (8) is positioned above the water stop gasket (7).
7. A method of using the foundation pit gas lift reverse circulation precipitation device of any one of the preceding claims, characterized in that:
after a water outlet is connected with a water outlet pipe (100), integrally placing the foundation pit gas-lift reverse circulation precipitation device into the precipitation well pipe (200) until the foundation pit gas-lift reverse circulation precipitation device reaches the bottom of the precipitation well pipe (200); when the air compressor (6) is not started to add air, the water-stopping gasket (7) is in a loosened state, the pressure in the hollow pipe (1) is far less than the pressure in the precipitation well pipe (200), accumulated water outside the hollow pipe (1) sequentially passes through the trash rack (4) and the through hole (3) under the action of pressure difference, and the water-stopping gasket (7) is jacked up and enters the hollow pipe (1) to form a water column until the pressure inside and outside the hollow pipe (1) is balanced;
after an air compressor (6) is started to add air, airflow enters the hollow pipe (1), and airflow and water columns form a water-air mixture in the hollow pipe (1) and flow to the outside of the hollow pipe (1) under the action of pressure difference, so that the airflow and the water columns are pumped out along the water outlet and the water outlet pipe;
after drawing water and accomplishing, stop air compressor machine (6), stagnant water gasket (7) are in the state of unclamping again after losing the pressure effect of atmospheric pressure, and hollow tube (1) internal pressure is less than precipitation well pipe internal pressure far away this moment, and hollow tube (1) outside ponding gets into the inside water column that forms of hollow tube (1) again under the effect of pressure differential, until hollow tube (1) inside and outside pressure balance, draws water once more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011502080.2A CN112523239A (en) | 2020-12-18 | 2020-12-18 | Foundation pit gas lift reverse circulation dewatering device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011502080.2A CN112523239A (en) | 2020-12-18 | 2020-12-18 | Foundation pit gas lift reverse circulation dewatering device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112523239A true CN112523239A (en) | 2021-03-19 |
Family
ID=75001339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011502080.2A Pending CN112523239A (en) | 2020-12-18 | 2020-12-18 | Foundation pit gas lift reverse circulation dewatering device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112523239A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215086A (en) * | 2021-11-29 | 2022-03-22 | 上海渊丰地下工程技术有限公司 | Multistage negative pressure gas lift type dewatering well |
| CN114233382A (en) * | 2021-11-29 | 2022-03-25 | 上海渊丰地下工程技术有限公司 | Negative pressure gas lift type dewatering pipe well |
-
2020
- 2020-12-18 CN CN202011502080.2A patent/CN112523239A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215086A (en) * | 2021-11-29 | 2022-03-22 | 上海渊丰地下工程技术有限公司 | Multistage negative pressure gas lift type dewatering well |
| CN114233382A (en) * | 2021-11-29 | 2022-03-25 | 上海渊丰地下工程技术有限公司 | Negative pressure gas lift type dewatering pipe well |
| CN114215086B (en) * | 2021-11-29 | 2023-03-14 | 上海渊丰地下工程技术有限公司 | Multistage negative pressure gas lift type dewatering well |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107653931B (en) | Saline-alkali soil transformation system and method | |
| CN112523239A (en) | Foundation pit gas lift reverse circulation dewatering device and method | |
| CN113279421B (en) | Vacuum dewatering process for deep foundation pit | |
| CN214089939U (en) | Foundation pit gas lift reverse circulation precipitation device | |
| CN105256818A (en) | One pump-multi well deep foundation pit tube well synchronous pumping and drainage drawdown device | |
| CN205205843U (en) | Synchronous pump drainage precipitation device of many well depths of pump foundation ditch tubular well | |
| CN210714529U (en) | Tunnel foundation pit dewatering well washing device | |
| CN210315385U (en) | Small-bore deep well three-pipe gas drive drainage and seepage device | |
| CN110374124B (en) | Subway construction drainage system | |
| CN210315444U (en) | Water leakage collecting well suitable for underground powerhouse of pumped storage power station | |
| CN207228283U (en) | Hydroelectric power plant's seepage from powerhouse drainage system | |
| CN216108848U (en) | A energy-conserving integration sewage pump station for crossing a river | |
| CN206956917U (en) | A kind of automatically cleaning pumping plant base for collecting sludge certainly | |
| CN215630060U (en) | Reusable precipitation well casing | |
| CN211922678U (en) | Multi-through-hole dewatering device applied to foundation pit | |
| CN211006723U (en) | Drainage structures of precipitation well | |
| CN105604076A (en) | Vacuum pump water-discharging device suitable for tunnel excavation | |
| CN208776335U (en) | Submersible type waterworks | |
| CN214884049U (en) | Efficient medium and low permeability formation fluid exploitation device | |
| CN214614103U (en) | Steel plate supporting and dewatering integrated system | |
| CN211421153U (en) | Automatic collecting and discharging device for water leakage of side wall of foundation pit | |
| CN206486900U (en) | A kind of use air compressor machine and water pump concentrate the tube well dewatering system drawn water | |
| CN219732050U (en) | Precipitation device of foundation pit local shallow layer self-priming pump | |
| CN214423392U (en) | Novel well point dewatering device | |
| CN214033963U (en) | Stifled row combines watertight fittings suitable for underground structure engineering |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |