CN105442624A - Gas pumping-injecting interactive type foundation pit precipitation system and precipitation method thereof - Google Patents
Gas pumping-injecting interactive type foundation pit precipitation system and precipitation method thereof Download PDFInfo
- Publication number
- CN105442624A CN105442624A CN201511003391.3A CN201511003391A CN105442624A CN 105442624 A CN105442624 A CN 105442624A CN 201511003391 A CN201511003391 A CN 201511003391A CN 105442624 A CN105442624 A CN 105442624A
- Authority
- CN
- China
- Prior art keywords
- well
- gate valve
- gas
- precipitation unit
- note
- 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.)
- Withdrawn
Links
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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a gas pumping-injecting interactive type foundation pit precipitation system and a precipitation method thereof, relates to the technical field of civil engineering construction, and aims to improving dewatering efficiency of a low-permeability soil layer. The system comprises at least two pumping-injecting interactive precipitation units, wherein each pumping-injecting interactive precipitation unit comprises a well tube, a filter tube, a precipitation tube, a gas pumping gate valve, a gas injecting gate valve and a vacuum pump which are sequentially connected in series from top to bottom, wherein a submersible pump and a liquid level meter are arranged in the filter tube; the upper-end tube opening of the well tube is sealed by a well lid; the vacuum pump is connected to a gas hole in the well lid by virtue of the gas pumping gate valve; a high-pressure gas source is connected to the gas hole in the well lid by virtue of the gas injecting gate valve; each pumping-injecting interactive precipitation unit is used as a strong vacuum tube well for precipitating a foundation pit soil body; and when water yield of each pumping-injecting interactive precipitation unit is obviously reduced, each pumping-injecting interactive precipitation unit is converted into a gas injecting well for use. The system and the method provided by the invention are especially suitable for precipitation of the low-permeability soil layer.
Description
Technical field
The present invention relates to civil engineering technology, particularly relate to the technology that a kind of gas takes out the interactive foundation pit dewatering system of note and precipitation method thereof.
Background technology
For providing dry to deep-foundation pit engineering and the construction environment of safety, adopting the method for precipitation to reduce excavation soil layer is very necessary with the groundwater table in the aquifer that base plate of foundation pit pressure-bearing Shuitu may be caused to gush.At soft clay area deep-foundation pit engineering because cutting depth is dark, the water level in general employing pipe well reduction aquifer or water content.
But the change of soft clay area soil nature greatly, and when being positioned near at the bottom of aquifer at the bottom of excavation of foundation pit face or excavation scope aquifer is thinner or there is local lens body, tube well dewatering is difficult to play its effect completely, easily forms aquitard at part.Simultaneously for hypotonicity soil layer, the drainage influence basin of dewatering well is little, and it is large that soil moisture in layer reduces difficulty, and corresponding pipe well spacing is less, will affect soil excavation, strengthens the problems such as pipe well protection difficulty.
Adopt the mode adding vacuum can improve drainage effect to a certain extent, but for hypotonicity soil layer, along with continuing of adding that vacuum draws water, the permeability of dewatering well periphery soil layer sharply diminishes, and affects dewatering well water yield, closely and directly affects drainage efficiency.
Summary of the invention
For the defect existed in above-mentioned prior art, technical problem to be solved by this invention is to provide a kind of gas that can improve hypotonicity soil layer drainage efficiency and takes out the interactive foundation pit dewatering system of note and precipitation method thereof.
In order to solve the problems of the technologies described above, a kind of gas provided by the present invention takes out the interactive foundation pit dewatering system of note, it is characterized in that: comprise at least two and take out the mutual precipitation unit of note;
The described mutual precipitation unit of note of taking out comprises well casing, chimney filter, sediment tube, filter, to bleed gate valve, gas injection gate valve, vacuum pump, described well casing, chimney filter, sediment tube is all perpendicular to be put in the soil layer of foundation ditch, and chimney filter is positioned at below excavation of foundation pit face, the upper end mouth of pipe of chimney filter docks with the lower end mouth of pipe of well casing, the lower end mouth of pipe of chimney filter docks with the upper end mouth of pipe of sediment tube, described filter envelopes chimney filter, the tube wall of sediment tube and the bottom tube wall of well casing, the soil body of foundation ditch and well casing, chimney filter, an annular space is formed between the outer tube wall of sediment tube, in this annular space, backfill filtrate forms filter material layer, and the backfill face capping of this filter material layer has clay sealing layer, submersible pump is provided with in chimney filter, content gauge, the upper end mouth of pipe of well casing is closed by a well lid, well lid offers a pore,
The pore on well lid received by the air inlet port of described gate valve of bleeding, and the extract opening of vacuum pump is received in the gas outlet of gate valve of bleeding;
The air inlet port of described gas injection gate valve connects high-pressure air source, and the pore on well lid is received in the gas outlet of gas injection gate valve.
Gas provided by the present invention takes out the precipitation method noting interactive foundation pit dewatering system, it is characterized in that:
First each is taken out the mutual precipitation unit of note, as strong vacuum tube well, precipitation is carried out to soil mass of foundation pit, and the water yield noting mutual precipitation unit is taken out to each monitor;
If each takes out the water yield noting mutual precipitation unit be less than the water yield lower limit preset, then will take out the mutual precipitation unit of note and be divided into two groups, wherein one group for vacuumizing group, another group is gas injection group, vacuumize in group each take out the mutual precipitation unit of note, as strong vacuum tube well, precipitation carried out to soil mass of foundation pit, each in gas injection group is taken out the mutual precipitation unit of note and is injected gases at high pressure as gas injection well to soil mass of foundation pit, utilizes the underground water that gases at high pressure promote in soil mass of foundation pit;
After taking out note mutual precipitation unit being divided into two groups, if the quantity noting mutual precipitation unit of taking out vacuumized in group is greater than the vacuum well amount threshold preset, and each vacuumizing in group is taken out the water yield noting mutual precipitation unit and is less than the water yield lower limit preset, then the part vacuumized in group is taken out the mutual precipitation unit of note and proceeds to gas injection group, make to vacuumize in group each take out the water yield noting mutual precipitation unit and can maintain more than the water yield lower limit preset;
When taking out the mutual precipitation unit of note as strong vacuum tube well use, the gate valve of bleeding in this unit is opened, and the gas injection gate valve in this unit is closed, utilize the gas in vacuum pump extraction well casing, and utilize submersible pump to extract the water collected in chimney filter out;
Take out note mutual precipitation unit when using as gas injection well, the gate valve of bleeding in this unit is closed, and the gas injection gate valve in this unit is opened, in well casing, inject gases at high pressure by high-pressure air source.
Gas provided by the invention takes out the interactive foundation pit dewatering system of note and precipitation method thereof, can use respectively taking out the mutual precipitation unit of the note gas injection well that is converted to gradually according to water yield in Precipitation Process, gas-powered underground water is utilized to collect excretion to the mutual precipitation unit of note of taking out used as strong vacuum tube well, hypotonicity soil layer drainage efficiency can be improved, solve dewatering well and be difficult to the problem of drainage at hypotonicity soil layer, locally aquifer.
Accompanying drawing explanation
Fig. 1 be the gas of the embodiment of the present invention take out note interactive foundation pit dewatering system in take out the structural representation noting mutual precipitation unit.
Detailed description of the invention
Illustrate below in conjunction with accompanying drawing and embodiments of the invention are described in further detail; but the present embodiment is not limited to the present invention; every employing analog structure of the present invention and similar change thereof, all should list protection scope of the present invention in, the pause mark in the present invention all represent and relation.
As shown in Figure 1, a kind of gas that the embodiment of the present invention provides takes out the interactive foundation pit dewatering system of note, it is characterized in that: comprise at least two and take out the mutual precipitation unit of note;
The described mutual precipitation unit of note of taking out comprises well casing, chimney filter, sediment tube, filter, to bleed gate valve, gas injection gate valve, vacuum pump, described well casing, chimney filter, sediment tube is all perpendicular to be put in the soil layer of foundation ditch, and chimney filter is positioned at below excavation of foundation pit face, the upper end mouth of pipe of chimney filter docks with the lower end mouth of pipe of well casing, the lower end mouth of pipe of chimney filter docks with the upper end mouth of pipe of sediment tube, described filter envelopes chimney filter, the tube wall of sediment tube and the bottom tube wall of well casing, the soil body of foundation ditch and well casing, chimney filter, an annular space is formed between the outer tube wall of sediment tube, in this annular space, backfill filtrate forms filter material layer, and the backfill face capping of this filter material layer has clay sealing layer, submersible pump is provided with in chimney filter, content gauge, the upper end mouth of pipe of well casing is closed by a well lid, well lid offers a pore,
The pore on well lid received by the air inlet port of described gate valve of bleeding, and the extract opening of vacuum pump is received in the gas outlet of gate valve of bleeding;
The air inlet port of described gas injection gate valve connects high-pressure air source, and the pore on well lid is received in the gas outlet of gas injection gate valve.
The gas that the embodiment of the present invention provides takes out the precipitation method noting interactive foundation pit dewatering system, and it is characterized in that, concrete steps are as follows:
Each is taken out the mutual precipitation unit of note, as strong vacuum tube well, precipitation is carried out to soil mass of foundation pit, and the water yield noting mutual precipitation unit is taken out to each monitor;
If each takes out the water yield noting mutual precipitation unit be less than the water yield lower limit preset, then will take out the mutual precipitation unit of note and be divided into two groups, wherein one group for vacuumizing group, another group is gas injection group, vacuumize in group each take out the mutual precipitation unit of note, as strong vacuum tube well, precipitation carried out to soil mass of foundation pit, each in gas injection group is taken out the mutual precipitation unit of note and is injected gases at high pressure as gas injection well to soil mass of foundation pit, utilizes the underground water that gases at high pressure promote in soil mass of foundation pit;
After taking out note mutual precipitation unit being divided into two groups, if the quantity noting mutual precipitation unit of taking out vacuumized in group is greater than the vacuum well amount threshold preset, and each vacuumizing in group is taken out the water yield noting mutual precipitation unit and is less than the water yield lower limit preset, then the part vacuumized in group is taken out the mutual precipitation unit of note and proceeds to gas injection group, make to vacuumize in group each take out the water yield noting mutual precipitation unit and can maintain more than the water yield lower limit preset;
When taking out the mutual precipitation unit of note as strong vacuum tube well use, gate valve of bleeding in this unit is opened, and the gas injection gate valve in this unit is closed, utilize the gas in vacuum pump extraction well casing, and utilize submersible pump to extract the water collected in chimney filter out, well casing periphery is made to form precipitation funnel, gravity water in soil layer constantly flows into well casing under gravity and negative pressure of vacuum effect, because chimney filter is positioned at below excavation of foundation pit face, the lasting maintenance of the vacuum in well casing can be guaranteed, filter material layer, clay sealing layer and filter can guarantee that well casing all has water guide function to the aquifer at different depth place, content gauge can guarantee that submersible pump can use always under water level, guarantee the application life of submersible pump, also can control the water level in well casing simultaneously,
Take out note mutual precipitation unit when using as gas injection well, the gate valve of bleeding in this unit is closed, and the gas injection gate valve in this unit is opened, in well casing, inject gases at high pressure by high-pressure air source.
Claims (2)
1. gas takes out the interactive foundation pit dewatering system of note, it is characterized in that: comprise at least two and take out the mutual precipitation unit of note;
The described mutual precipitation unit of note of taking out comprises well casing, chimney filter, sediment tube, filter, to bleed gate valve, gas injection gate valve, vacuum pump, described well casing, chimney filter, sediment tube is all perpendicular to be put in the soil layer of foundation ditch, and chimney filter is positioned at below excavation of foundation pit face, the upper end mouth of pipe of chimney filter docks with the lower end mouth of pipe of well casing, the lower end mouth of pipe of chimney filter docks with the upper end mouth of pipe of sediment tube, described filter envelopes chimney filter, the tube wall of sediment tube and the bottom tube wall of well casing, the soil body of foundation ditch and well casing, chimney filter, an annular space is formed between the outer tube wall of sediment tube, in this annular space, backfill filtrate forms filter material layer, and the backfill face capping of this filter material layer has clay sealing layer, submersible pump is provided with in chimney filter, content gauge, the upper end mouth of pipe of well casing is closed by a well lid, well lid offers a pore,
The pore on well lid received by the air inlet port of described gate valve of bleeding, and the extract opening of vacuum pump is received in the gas outlet of gate valve of bleeding;
The air inlet port of described gas injection gate valve connects high-pressure air source, and the pore on well lid is received in the gas outlet of gas injection gate valve.
2. gas according to claim 1 takes out the precipitation method noting interactive foundation pit dewatering system, it is characterized in that:
First each is taken out the mutual precipitation unit of note, as strong vacuum tube well, precipitation is carried out to soil mass of foundation pit, and the water yield noting mutual precipitation unit is taken out to each monitor;
If each takes out the water yield noting mutual precipitation unit be less than the water yield lower limit preset, then will take out the mutual precipitation unit of note and be divided into two groups, wherein one group for vacuumizing group, another group is gas injection group, vacuumize in group each take out the mutual precipitation unit of note, as strong vacuum tube well, precipitation carried out to soil mass of foundation pit, each in gas injection group is taken out the mutual precipitation unit of note and is injected gases at high pressure as gas injection well to soil mass of foundation pit, utilizes the underground water that gases at high pressure promote in soil mass of foundation pit;
After taking out note mutual precipitation unit being divided into two groups, if the quantity noting mutual precipitation unit of taking out vacuumized in group is greater than the vacuum well amount threshold preset, and each vacuumizing in group is taken out the water yield noting mutual precipitation unit and is less than the water yield lower limit preset, then the part vacuumized in group is taken out the mutual precipitation unit of note and proceeds to gas injection group, make to vacuumize in group each take out the water yield noting mutual precipitation unit and can maintain more than the water yield lower limit preset;
When taking out the mutual precipitation unit of note as strong vacuum tube well use, the gate valve of bleeding in this unit is opened, and the gas injection gate valve in this unit is closed, utilize the gas in vacuum pump extraction well casing, and utilize submersible pump to extract the water collected in chimney filter out;
Take out note mutual precipitation unit when using as gas injection well, the gate valve of bleeding in this unit is closed, and the gas injection gate valve in this unit is opened, in well casing, inject gases at high pressure by high-pressure air source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511003391.3A CN105442624A (en) | 2015-12-29 | 2015-12-29 | Gas pumping-injecting interactive type foundation pit precipitation system and precipitation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511003391.3A CN105442624A (en) | 2015-12-29 | 2015-12-29 | Gas pumping-injecting interactive type foundation pit precipitation system and precipitation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105442624A true CN105442624A (en) | 2016-03-30 |
Family
ID=55553219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511003391.3A Withdrawn CN105442624A (en) | 2015-12-29 | 2015-12-29 | Gas pumping-injecting interactive type foundation pit precipitation system and precipitation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105442624A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106049518A (en) * | 2016-07-08 | 2016-10-26 | 廊坊市仁达岩土工程有限公司 | Improved vacuum dewatering system and control method thereof |
| CN107587529A (en) * | 2017-09-13 | 2018-01-16 | 吉林大学 | Gas-water pressure balanced type underground anti-seepage sealing technique and equipment used |
| CN108316325A (en) * | 2018-04-18 | 2018-07-24 | 上海兴怡基础工程有限公司 | A kind of vacuum deep well drinking-water pipe |
| CN110878557A (en) * | 2019-12-05 | 2020-03-13 | 上海勘察设计研究院(集团)有限公司 | Layered bidirectional drainage method and device for foundation pit dewatering |
| CN111721918A (en) * | 2020-06-29 | 2020-09-29 | 浙江工业大学 | Air-containing belt saturated soil body vertical shaft combined vacuum method precipitation test device and method |
| CN113026786A (en) * | 2021-05-25 | 2021-06-25 | 上海建工集团股份有限公司 | Air pressure circulating type precipitation monitoring method |
| CN114134918A (en) * | 2021-11-10 | 2022-03-04 | 上海建工四建集团有限公司 | Use method of full-automatic control type vacuum deep well device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1213726A (en) * | 1997-10-07 | 1999-04-14 | 孙五奇 | High effective dredging strengthening method of soft foundation |
| JP3451382B2 (en) * | 1994-06-27 | 2003-09-29 | 東洋建設株式会社 | Underground water discharge method and drainage device |
| CN201610552U (en) * | 2010-02-08 | 2010-10-20 | 上海广联建设发展有限公司 | Strong vacuum unwatering downcomer well |
| CN203007963U (en) * | 2013-01-08 | 2013-06-19 | 中铁上海工程局有限公司 | Ultra-high vacuum double-pipe drained well at low-permeability silt clay course |
| CN104264699A (en) * | 2014-09-30 | 2015-01-07 | 冯克俊 | Negative pressure air jet deep well dewatering device of foundation pit |
| CN205444217U (en) * | 2015-12-29 | 2016-08-10 | 上海广联环境岩土工程股份有限公司 | Interactive foundation pit dewatering system of annotating is taken out to gas |
-
2015
- 2015-12-29 CN CN201511003391.3A patent/CN105442624A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3451382B2 (en) * | 1994-06-27 | 2003-09-29 | 東洋建設株式会社 | Underground water discharge method and drainage device |
| CN1213726A (en) * | 1997-10-07 | 1999-04-14 | 孙五奇 | High effective dredging strengthening method of soft foundation |
| CN201610552U (en) * | 2010-02-08 | 2010-10-20 | 上海广联建设发展有限公司 | Strong vacuum unwatering downcomer well |
| CN203007963U (en) * | 2013-01-08 | 2013-06-19 | 中铁上海工程局有限公司 | Ultra-high vacuum double-pipe drained well at low-permeability silt clay course |
| CN104264699A (en) * | 2014-09-30 | 2015-01-07 | 冯克俊 | Negative pressure air jet deep well dewatering device of foundation pit |
| CN205444217U (en) * | 2015-12-29 | 2016-08-10 | 上海广联环境岩土工程股份有限公司 | Interactive foundation pit dewatering system of annotating is taken out to gas |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106049518A (en) * | 2016-07-08 | 2016-10-26 | 廊坊市仁达岩土工程有限公司 | Improved vacuum dewatering system and control method thereof |
| CN106049518B (en) * | 2016-07-08 | 2017-11-07 | 廊坊市仁达岩土工程有限公司 | A kind of improved vacuum precipitation system and its control method |
| CN107587529A (en) * | 2017-09-13 | 2018-01-16 | 吉林大学 | Gas-water pressure balanced type underground anti-seepage sealing technique and equipment used |
| CN107587529B (en) * | 2017-09-13 | 2019-04-30 | 吉林大学 | Gas-water pressure balanced type underground anti-seepage sealing technique and equipment used |
| CN108316325A (en) * | 2018-04-18 | 2018-07-24 | 上海兴怡基础工程有限公司 | A kind of vacuum deep well drinking-water pipe |
| CN110878557A (en) * | 2019-12-05 | 2020-03-13 | 上海勘察设计研究院(集团)有限公司 | Layered bidirectional drainage method and device for foundation pit dewatering |
| CN110878557B (en) * | 2019-12-05 | 2022-08-02 | 上海勘察设计研究院(集团)有限公司 | Layered bidirectional drainage method for foundation pit dewatering |
| CN111721918A (en) * | 2020-06-29 | 2020-09-29 | 浙江工业大学 | Air-containing belt saturated soil body vertical shaft combined vacuum method precipitation test device and method |
| CN113026786A (en) * | 2021-05-25 | 2021-06-25 | 上海建工集团股份有限公司 | Air pressure circulating type precipitation monitoring method |
| CN113026786B (en) * | 2021-05-25 | 2021-08-10 | 上海建工集团股份有限公司 | Air pressure circulating type precipitation monitoring method |
| CN114134918A (en) * | 2021-11-10 | 2022-03-04 | 上海建工四建集团有限公司 | Use method of full-automatic control type vacuum deep well device |
| CN114134918B (en) * | 2021-11-10 | 2023-08-08 | 上海建工四建集团有限公司 | Use method of full-automatic control type vacuum deep well device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105442624A (en) | Gas pumping-injecting interactive type foundation pit precipitation system and precipitation method thereof | |
| CN205444215U (en) | Gas drive foundation pit dewatering system | |
| CN204255690U (en) | Piston type underground water sampler | |
| CN204724575U (en) | A kind of two-phase extracting repair system for soil and groudwater remediation | |
| CN102733371B (en) | Closed direct-sucking sectional vacuum preloading foundation treatment method | |
| CN104358267A (en) | Vacuum tube well precipitation and disposal method for rapidly restoring in-situ water and soil in polluted place | |
| CN105332384A (en) | Super pressure suction joint pumping system and operating method thereof | |
| CN209182122U (en) | A kind of experimental rig of microorganism gelling Stabilization of Loess sample | |
| CN201785761U (en) | Water-gas separation integrated tube well | |
| CN105401587A (en) | Water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and water descending method of water descending system | |
| CN105525606A (en) | Novel vacuum preloading air-exhaust drainage system | |
| CN112281883B (en) | Precipitation system and operation method thereof | |
| CN212904866U (en) | Vertical shaft combined vacuum precipitation test device containing closed gas-bag saturated soil body | |
| CN104612649A (en) | Method and device for fracturing and permeability and yield increasing of coal-bed gas well of low-pressure and low permeability reservoir by means of chemical permeability increasing | |
| CN103615014B (en) | A kind of dewatering device of soft soil foundation pit and using method thereof | |
| CN205444217U (en) | Interactive foundation pit dewatering system of annotating is taken out to gas | |
| CN206438525U (en) | A kind of construction of hydro project well-points dewatering | |
| CN210788579U (en) | Pile-pumping-injection combined remediation device for contaminated soil | |
| CN205444216U (en) | Depth well foundation pit dewatering system on compound stratum of large -scale foundation ditch | |
| CN103934250A (en) | Device and method for extracting landfill gas and leachate in domestic waste heap simultaneously | |
| CN102733810B (en) | Impermeable sealing method for vertical well of underground water-sealed cavern oil storage | |
| CN204627660U (en) | A kind of negative pressure gas pumping device | |
| CN203284787U (en) | Composite pipe well precipitation system | |
| CN102535399B (en) | Decompression device of under-membrane reverse pressure of impermeable geo-membrane at reservoir bottom of plain reservoir | |
| CN205348204U (en) | Light well point precipitation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160330 |
|
| WW01 | Invention patent application withdrawn after publication |