CN115110557A - Pneumatic negative pressure water pumping method - Google Patents
Pneumatic negative pressure water pumping method Download PDFInfo
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- CN115110557A CN115110557A CN202210632334.5A CN202210632334A CN115110557A CN 115110557 A CN115110557 A CN 115110557A CN 202210632334 A CN202210632334 A CN 202210632334A CN 115110557 A CN115110557 A CN 115110557A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 208
- 238000005086 pumping Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000203 mixture Substances 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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- Environmental & Geological Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention discloses a pneumatic negative pressure water pumping method, and particularly relates to the technical field related to negative pressure water pumping. According to the pneumatic negative pressure water pumping method, only the air compressor is used as a single power source to generate positive pressure power and negative pressure power, and high-pressure gas is used for generating negative pressure through the vacuum generator, so that the water tank can normally work without water, multiple devices are not needed to participate, noise pollution can be greatly reduced, the water drainage speed is high, the pneumatic negative pressure water pumping method is suitable for water pumping and water drainage work of dewatering wells at different depths, and the application range of the pneumatic negative pressure water pumping method is greatly improved.
Description
Technical Field
The invention relates to the technical field related to negative pressure water pumping, in particular to a pneumatic negative pressure water pumping method.
Background
The conventional foundation pit dewatering and dewatering system mostly adopts a submersible pump to pump water, a vacuum pump pumps the water, negative pressure is applied to the interior of a well to accelerate water in a stratum to flow into the well, or an air compressor is adopted to form a water-vapor mixture in the well and then the water is pumped out by the vacuum pump to form a combined pumping system. Both of them need separate vacuum pump to provide negative pressure source for extracting gas and water-vapor mixture in precipitation well. The vacuum pump generally adopts a jet vacuum pump, water in a circulating water tank generates certain pressure and flow velocity after acting through the circulating water pump, the water with certain pressure and flow velocity enters a water collecting chamber of a water injector, the water is injected through a plurality of Laval nozzles on a pore plate, the formed high-speed jet flow enables a mixing chamber of the injector to generate vacuum, pumped media enter the mixing chamber of the injector under the action of vacuum, are fully mixed with high-speed water flow in the mixing chamber and are discharged into the circulating water tank after the speed reduction and the pressure increase of a Venturi tube, non-condensable gas is separated out, the condensable gas overflows from an overflow port of the water tank, and the action is repeatedly performed.
Because the jet flow type vacuum pump needs to extract gas or water-vapor mixture in the well independently, the jet flow type vacuum pump also has obvious defects in actual construction: 1. the jet-type vacuum pump needs to be connected with a circulating water tank with a larger capacity, water adding operation is needed in the construction process, and the jet-type vacuum pump cannot operate after water shortage; 2. after the jet type vacuum pump is started for a long time, circulating water is heated after being circulated for many times, so that the stability of the whole equipment is influenced after the temperature of the equipment rises; 3. the jet type vacuum pump has limited effective depth, and the effective depth meets the bottom in the process of pumping water from a deeper dewatering well; 4. need multiple equipment to participate in the drainage precipitation well, if immersible pump and air compressor machine participate in jointly, single equipment can not work, and the unable integrated concentrated installation of equipment, many small-size air compressors produce the ambient noise.
In view of the above, the present invention provides a pneumatic negative pressure water pumping method.
Disclosure of Invention
The invention mainly aims to provide a pneumatic negative pressure water pumping method which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
the pneumatic negative pressure water pumping method is characterized by comprising two working states, namely a negative pressure water pumping working condition and a positive pressure water drainage working condition, wherein the negative pressure water pumping working condition and the positive pressure water drainage working condition repeatedly and circularly operate to realize continuous water pumping;
the negative pressure water pumping operation working condition comprises the following specific steps:
s11, the air compressor is powered on, the pressurized air is input into a large air storage tank for storage, and the high-pressure air enters a small air storage tank and an air pressure vacuum generator through pipelines respectively;
s12, the small air storage tank sends the high-pressure air into a water-air mixer in the dewatering well in a multipath manner through a positive pressure connecting pipeline, so that water and air are mixed to form a water-air mixture;
s13, the air pressure vacuum generator uses the high-pressure air conveyed by the small air storage tank to suck out the air in the pressure water storage tank, and negative pressure is formed in the pressure water storage tank;
s14, connecting the water outlet end of the water-gas mixer with a pressure water storage tank through a negative pressure connecting pipeline, and sucking the water-gas mixture in the water-gas mixer into the pressure water storage tank under the condition that negative pressure is generated in the pressure water storage tank;
s15, pumping out the water in the precipitation well, and lowering the water level to achieve the purpose of pumping water;
the positive pressure drainage operation condition comprises the following specific steps:
s21, when the water level in the pressure water storage tank exceeds the limited height, closing the air pressure vacuum generator;
s22, sending the high-pressure gas in the small gas storage tank into the pressure water storage tank, so that the pressure in the pressure water storage tank is increased, and the water in the pressure water storage tank is discharged from a drainage pipeline under the high-pressure condition to finish the drainage work;
and S23, when the water level in the pressure water storage tank is reduced to a high level or is completely discharged, stopping conveying the high-pressure gas into the pressure water storage tank, starting the air pressure vacuum generator, pumping the gas in the pressure water storage tank out by the air pressure vacuum generator to form negative pressure, and returning to the negative pressure pumping operation condition.
Preferably, the positive pressure connecting pipeline is provided with a plurality of groups and is communicated with the air inlet end of the water-air mixer and the air outlet end of the message air storage tank, and each group of positive pressure connecting pipelines is provided with a first electromagnetic valve in a matched manner.
Preferably, the negative pressure connecting pipelines are provided with a plurality of groups and communicated with the water-gas mixer and the pressure water storage tank, and each group of negative pressure connecting pipelines is provided with a one-way electromagnetic valve in a matching way.
Preferably, the pressure water storage tank is also provided with a drainage pipeline for draining water outside, and the drainage pipeline is provided with a second electromagnetic valve for controlling the on-off of the drainage in a matching manner.
Preferably, a pressure detector for detecting the pressure intensity in the pressure water storage tank in real time is arranged at the top of the pressure water storage tank.
Preferably, the output end of the air compressor is connected with the air inlet end of the large air storage tank through a pipeline, the air outlet end of the large air storage tank is connected with the air inlet end of the air pressure vacuum generator and the air inlet end of the small air storage tank through pipelines respectively, and the small air storage tank is connected with the pressure water storage tank through a connecting pipeline.
Preferably, a third electromagnetic valve is arranged on a pipeline between the small air storage tank and the pressure water storage tank in a matched mode.
Preferably, a high-level water level sensor and a low-level water level sensor are arranged in the pressure water storage tank.
Compared with the prior art, the invention has the following beneficial effects:
1. the pneumatic negative pressure water pumping method adopts high-pressure gas to generate negative pressure through the vacuum generator, so that the water tank can work normally even if no water exists.
2. The pneumatic negative pressure water pumping method only uses a single power source of the air compressor to generate positive pressure power and negative pressure power, the compressed air provides power, energy loss caused by height difference is overcome, and the whole equipment is high in stability.
3. The pneumatic negative pressure water pumping method adopts active drainage, has high drainage speed, is suitable for the water pumping and drainage work of dewatering wells with different depths, and has larger application range.
4. The pneumatic negative pressure water pumping method disclosed by the invention has the advantages that the power unit is single, a plurality of devices are not required to participate, the noise pollution can be greatly reduced, and the devices are simple and quick to install.
Drawings
FIG. 1 is a schematic view of the operating conditions of the present invention for negative pressure pumping;
FIG. 2 is a schematic view of the positive pressure drainage operation of the present invention;
fig. 3 is a schematic view of the installation position of the water-gas mixer of the present invention.
In the figure: 1. an air compressor; 2. a large gas storage tank; 3. a small gas storage tank; 4. a pressure water storage tank; 5. a pneumatic vacuum generator; 6. a third electromagnetic valve; 7. a first electromagnetic valve; 8. a one-way electromagnetic valve; 9. a second electromagnetic valve; 10. a negative pressure connecting pipeline; 11. a positive pressure connecting pipeline; 12. a pressure detector; 13. a high level water level sensor; 14. a low level water sensor; 15. a water-gas mixer; 16. a dewatering well.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments.
As shown in fig. 1-3, the pneumatic negative pressure water pumping method disclosed in the present invention mainly comprises an air compressor 1, a large air storage tank 2, a small air storage tank 3, a pressure water storage tank 4, an air pressure vacuum generator 5, and a water-air mixer 15 disposed in a dewatering well 16;
the air compressor 1 is used for generating high-pressure air, the output end of the air compressor 1 is connected with the air inlet end of the large air storage tank 2 through a pipeline and used for sending the high-pressure air generated by the air compressor 1 into the large air storage tank 2 for storage, the air outlet end of the large air storage tank 2 is connected with the air inlet end of the air pressure vacuum generator 5 and the air inlet end of the small air storage tank 3 through pipelines respectively, so that the small air storage tank 3 can be used for temporarily storing high-pressure air, in practice, air pressure detection equipment can be arranged in the large air storage tank 2 and the small air storage tank 3, when the pressure in the large air storage tank 2 and the small air storage tank 3 is reduced to a certain degree, an alarm is given out, and the air compressor 1 is started to compress the air and restore the pressure in the large air storage tank 2 and the small air storage tank 3;
in the invention, only a unique air compressor 1 is independently adopted as a power source, and a plurality of devices are not required to participate, so that the noise pollution can be greatly reduced, and the devices can be intensively installed.
The top of the pressure water storage tank 4 is provided with a pressure detector 12 for detecting the pressure in the pressure water storage tank 4 in real time, which is used for monitoring the pressure in the pressure water storage tank 4 in real time so as to protect the pressure water storage tank 4 and prolong the service life of the pressure water storage tank 4, and in addition, the pressure water storage tank 4 is also internally provided with a high-level water level sensor 13 and a low-level water level sensor 14 which are used for detecting the water level height in the pressure water storage tank 4;
in addition, in the invention, the small air storage tank 3 is connected with the pressure water storage tank 4 through a connecting pipeline, and the connecting pipeline is provided with a third electromagnetic valve 6 in a matching way, which is used for controlling the on-off of the pipeline between the small air storage tank 3 and the pressure water storage tank 4, when the small air storage tank is opened, the high-pressure air stored in the small air storage tank 3 can be conveyed into the pressure water storage tank 4 to increase the pressure in the pressure water storage tank 4, so that the water in the pressure water storage tank 4 is discharged through a drainage pipeline.
The air pressure vacuum generator 5 is fixedly arranged outside the pressure water storage tank 4, the air in the pressure water storage tank 4 is extracted by the aid of high-pressure air auxiliary work of conveying of the small air storage tank 3, negative pressure can be formed in the pressure water storage tank 4, multiple groups of negative pressure connecting pipelines 10 are fixedly connected to the outside of the pressure water storage tank 4, each group of negative pressure connecting pipelines 10 are provided with a first electromagnetic valve 7 in a matched mode, the negative pressure connecting pipelines 10 are connected with a water-steam mixer 15 arranged in a dewatering well 16, water in the dewatering well 16 is sucked in a negative pressure state in the pressure water storage tank 4, and the purpose of pumping water is achieved.
Furthermore, the water-gas mixer 15 is connected with the water-gas mixer 15 through the positive pressure connecting pipeline 11, the small air storage tank 3 sends high-pressure air into the water-gas mixer 15 in the dewatering well 16 in a multi-path mode through the positive pressure connecting pipeline 11, so that water and gas are mixed to form a water-gas mixture, the quality is reduced, and the subsequent pumping is facilitated.
The pneumatic negative pressure water pumping method of the invention is further disclosed in the following with reference to specific embodiments.
Example 1
The embodiment mainly discloses a negative pressure water pumping operation condition of the pneumatic negative pressure water pumping method, which comprises the following specific steps:
s11, switching on the power supply of the air compressor 1, inputting the pressurized air into the large air storage tank 2 for storage, and enabling the high-pressure air to enter the small air storage tank 3 and the air pressure vacuum generator 5 through pipelines respectively;
s12, the small air storage tank 3 sends the high-pressure air into the water-gas mixer 15 in the dewatering well 16 in a multipath manner through the positive pressure connecting pipeline 11, so that the water and the gas are mixed to form a water-gas mixture, and the quality of the water body is reduced;
s13, starting the air pressure vacuum generator 5, sucking out air in the pressure water storage tank 4 by using high-pressure air conveyed by the small air storage tank 3, and forming negative pressure in the pressure water storage tank 4; in the process, the pressure in the pressure water storage tank 4 is detected in real time by a pressure detector 12 arranged at the top of the pressure water storage tank 4 so as to protect the pressure;
specifically, the pressure detector 12 may be set to a highest pressure threshold according to the design specification of the pressure water storage tank 4, when the pressure in the pressure water storage tank 4 reaches or exceeds the highest pressure threshold, an alarm is given, and at this time, the third electromagnetic valve 6 disposed between the pressure water storage tank 4 and the small air storage tank 3 may be closed, so as to ensure that the pressure water storage tank 4 is not damaged;
s14, connecting the water outlet end of the water-air mixer 15 with the pressure water storage tank 4 through the negative pressure connecting pipeline 10, and sucking the water-air mixture in the water-air mixer 15 into the pressure water storage tank 4 under the condition that negative pressure is generated in the pressure water storage tank 4;
s15, the water in the dewatering well 16 is pumped out, the water level is lowered, the purpose of pumping water is achieved,
the embodiment has the advantages that: negative pressure power can be generated only by using a single power source of the air compressor, and the energy loss caused by the height difference is overcome by providing power through compressed air; the active drainage is adopted, the drainage speed is high, the water and the air are separated, and the water pumping amount is convenient to measure; the whole pumping device has a single power unit, is convenient to install and reduces noise pollution. High-pressure gas is adopted to generate negative pressure through a vacuum generator, and the water tank can work normally even if no water exists.
Example 2
The embodiment mainly discloses a positive pressure drainage operation condition of the pneumatic negative pressure water pumping method, which comprises the following specific steps:
s21, when the water level in the pressure water storage tank 4 exceeds the limited height, the air pressure vacuum generator 5 is closed, and simultaneously the third electromagnetic valve 6 arranged between the pressure water storage tank 4 and the small air storage tank 3 is opened, the first electromagnetic valve 7 and the one-way electromagnetic valve 8 are closed, and the second electromagnetic valve 9 for draining water is opened;
specifically, the height of the water level in the pressure water storage tank 4 is detected by a high level sensor 13 and a low level sensor 14 which are arranged inside the pressure water storage tank, and the above-mentioned limited height is the actual detection height of the high level sensor 13.
S22, sending the high-pressure gas in the small gas storage tank 3 into the pressure water storage tank 4, so as to increase the pressure in the pressure water storage tank 4, and after the second electromagnetic valve 9 is opened, discharging the water in the pressure water storage tank 4 from a water discharge pipeline under the high-pressure condition, thus finishing the water discharge work;
s23, when the water level in the pressure water storage tank 4 is reduced to a high level or is completely discharged, stopping conveying high-pressure gas into the pressure water storage tank 4, starting the air pressure vacuum generator 5, pumping the gas in the pressure water storage tank 4 out by the air pressure vacuum generator 5 to form negative pressure, and returning to the negative pressure water pumping operation working condition;
specifically, the low level sensor 14 may be installed at the bottom of the pressure water storage tank 4, and is specifically configured to detect the lowest water level in the pressure water storage tank 4, and monitor the lowest water level in real time, that is, the actual water level detected by the low level sensor 4 is the lowest height of the above-mentioned water level.
As can be seen from the above description of embodiment 1 and embodiment 2, the pneumatic negative pressure water pumping method disclosed in the present invention can be repeatedly and circularly operated between the negative pressure water pumping working condition and the positive pressure water drainage working condition, so as to ensure that water in the dewatering well 16 is pumped out, and the free switching between the two operating conditions can be realized by using the same set of equipment.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The pneumatic negative pressure water pumping method is characterized by comprising two working states, namely a negative pressure water pumping working condition and a positive pressure water drainage working condition, wherein the negative pressure water pumping working condition and the positive pressure water drainage working condition are repeatedly and circularly operated to realize continuous water pumping;
the negative pressure water pumping operation working condition comprises the following specific steps:
s11, switching on a power supply of the air compressor (1), inputting the pressurized air into a large air storage tank (2) for storage, and respectively introducing the high-pressure air into a small air storage tank (3) and an air pressure vacuum generator (5) through pipelines;
s12, the small air storage tank (3) sends high-pressure air into a water-air mixer (15) in a dewatering well (16) in a multi-path mode through a positive pressure connecting pipeline (11) to mix water and air to form a water-air mixture;
s13, the air pressure vacuum generator (5) sucks air in the pressure water storage tank (4) by using high-pressure air conveyed by the small air storage tank (3) to form negative pressure in the pressure water storage tank (4);
s14, connecting the water outlet end of the water-gas mixer (15) with the pressure water storage tank (4) through a negative pressure connecting pipeline (10), and sucking the water-gas mixture in the water-gas mixer (15) into the pressure water storage tank (4) under the condition that negative pressure is generated in the pressure water storage tank (4);
s15, pumping out the water in the dewatering well (16), and lowering the water level to achieve the purpose of pumping water;
the positive pressure drainage operation condition comprises the following specific steps:
s21, when the water level in the pressure water storage tank (4) exceeds the limited height, the air pressure vacuum generator (5) is closed;
s22, high-pressure air in the small air storage tank (3) is sent into the pressure water storage tank (4), so that the pressure in the pressure water storage tank (4) is increased, water in the pressure water storage tank (4) is discharged from a drainage pipeline under a high-pressure condition, and the drainage work is finished;
and S23, when the water level in the pressure water storage tank (4) is reduced to a high level or is completely discharged, stopping conveying high-pressure gas into the pressure water storage tank (4), starting the air pressure vacuum generator (5), pumping out the gas in the pressure water storage tank (4) by the air pressure vacuum generator (5) to form negative pressure, and returning to the negative pressure water pumping operation working condition.
2. The pneumatic negative pressure water pumping method according to claim 1, characterized in that: the positive pressure connecting pipeline (11) is provided with a plurality of groups and is communicated with the air inlet end of the water-air mixer (15) and the air outlet end of the message air storage tank, and the positive pressure connecting pipeline (11) of each group is provided with a first electromagnetic valve (7) in a matched mode.
3. The pneumatic negative pressure water pumping method according to claim 1, characterized in that: the negative pressure connecting pipelines (10) are provided with a plurality of groups and communicated with the water-gas mixer (15) and the pressure water storage tank (4), and each group of negative pressure connecting pipelines (10) is provided with a one-way electromagnetic valve (8) in a matching way.
4. The pneumatic negative pressure water pumping method according to claim 1, characterized in that: and a drainage pipeline for draining is further arranged outside the pressure water storage tank (4), and a second electromagnetic valve (9) for controlling the on-off of drainage is arranged on the drainage pipeline in a matched manner.
5. The pneumatic negative pressure water pumping method according to claim 1, characterized in that: and a pressure detector (12) for detecting the pressure intensity in the pressure water storage tank (4) in real time is arranged at the top of the pressure water storage tank (4).
6. The pneumatic negative pressure water pumping method according to claim 1, characterized in that: the air compressor is characterized in that the output end of the air compressor (1) is connected with the air inlet end of the large air storage tank (2) through a pipeline, the air outlet end of the large air storage tank (2) is connected with the air inlet end of the air pressure vacuum generator (5) and the air inlet end of the small air storage tank (3) through pipelines respectively, and the small air storage tank (3) is connected with the pressure water storage tank (4) through a connecting pipeline.
7. The pneumatic negative pressure water pumping method according to claim 6, characterized in that: and a third electromagnetic valve (6) is arranged between the small air storage tank (3) and the pressure water storage tank (4) in a matched manner.
8. The pneumatic negative pressure water pumping method according to claim 1, characterized in that: and a high-level water level sensor (13) and a low-level water level sensor (14) are arranged in the pressure water storage tank (4).
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| CN202210632334.5A CN115110557B (en) | 2022-06-07 | 2022-06-07 | Pneumatic negative pressure pumping method |
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| CN202210632334.5A CN115110557B (en) | 2022-06-07 | 2022-06-07 | Pneumatic negative pressure pumping method |
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| CN115110557A true CN115110557A (en) | 2022-09-27 |
| CN115110557B CN115110557B (en) | 2023-11-03 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10290978A (en) * | 1997-04-18 | 1998-11-04 | Hitachi Plant Eng & Constr Co Ltd | Soil pollution purifying method and device therefor |
| JP2006341214A (en) * | 2005-06-10 | 2006-12-21 | Asahi Techno:Kk | Vacuum type aw method |
| CN204530731U (en) * | 2015-01-05 | 2015-08-05 | 上海长凯岩土工程有限公司 | Super pressure inhales associating pumping system |
| CN110644464A (en) * | 2018-09-06 | 2020-01-03 | 连云港港口工程设计研究院有限公司 | Vacuum preloading drainage device with remote monitoring function |
| CN110939151A (en) * | 2019-12-27 | 2020-03-31 | 上海长凯岩土工程有限公司 | Water-vapor mixing system of super pressure-suction combined pumping system and working method thereof |
| CN113202122A (en) * | 2021-04-30 | 2021-08-03 | 中铁六局集团有限公司 | Foundation pit dewatering construction method based on super pressure suction combined pumping system |
| CN113293785A (en) * | 2021-06-15 | 2021-08-24 | 中铁一局集团(广州)建设工程有限公司 | Positive and negative pressure combined dewatering well structure with self-cleaning function and construction method |
-
2022
- 2022-06-07 CN CN202210632334.5A patent/CN115110557B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10290978A (en) * | 1997-04-18 | 1998-11-04 | Hitachi Plant Eng & Constr Co Ltd | Soil pollution purifying method and device therefor |
| JP2006341214A (en) * | 2005-06-10 | 2006-12-21 | Asahi Techno:Kk | Vacuum type aw method |
| CN204530731U (en) * | 2015-01-05 | 2015-08-05 | 上海长凯岩土工程有限公司 | Super pressure inhales associating pumping system |
| CN110644464A (en) * | 2018-09-06 | 2020-01-03 | 连云港港口工程设计研究院有限公司 | Vacuum preloading drainage device with remote monitoring function |
| CN110939151A (en) * | 2019-12-27 | 2020-03-31 | 上海长凯岩土工程有限公司 | Water-vapor mixing system of super pressure-suction combined pumping system and working method thereof |
| CN113202122A (en) * | 2021-04-30 | 2021-08-03 | 中铁六局集团有限公司 | Foundation pit dewatering construction method based on super pressure suction combined pumping system |
| CN113293785A (en) * | 2021-06-15 | 2021-08-24 | 中铁一局集团(广州)建设工程有限公司 | Positive and negative pressure combined dewatering well structure with self-cleaning function and construction method |
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| CN115110557B (en) | 2023-11-03 |
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