CN101787702A - Effective vacuum dewatering method - Google Patents
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- CN101787702A CN101787702A CN201019063046A CN201019063046A CN101787702A CN 101787702 A CN101787702 A CN 101787702A CN 201019063046 A CN201019063046 A CN 201019063046A CN 201019063046 A CN201019063046 A CN 201019063046A CN 101787702 A CN101787702 A CN 101787702A
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Abstract
The invention discloses an effective vacuum dewatering method, relates to the technical field of underground engineering dewatering and aims to solve the technical problems of small pumping radius and low water outlet rate in the prior art. The method is characterized in that: a filter is sleeved on, and a water inlet communicated with the filter is formed on a pipe wall on a bottom section pipe section of a well pipe of a dewatering well; a suction pump is arranged in the well pipe and a water sucking port of the suction pump is higher than the water inlet of the well pipe; a liquid level controller is arranged in the well pipe to control the operation of the suction pump; the top end of the well pipe is sealed by a well cover in an air leakage preventing mode; a vacuum pump is arranged on a ground surface; a vacuum pipe which is communicated with an air suction port of the vacuum pump and the cavity of the well pipe is arranged on the well cover; through holes on the well cover are sealed in an air leakage preventing mode; and the vacuum pump is used for exhausting air from the well pipe, so that the inside of the well pipe is in a high vacuum negative pressure state. The method can shorten water pumping running period and improve water outlet rate.
Description
Technical field
The present invention relates to the technology of underground construction precipitation, particularly relate to a kind of technology of effective vacuum dewatering method.
Background technology
In the underground engineering construction process in high water level area, often adopt the method for precipitation to reduce soil moisture in layer, thereby improve the construction safety of soil solidifying intensity, reduction artesian water jacking force, guarantee underground construction.Wherein, tube well dewatering is the widest a kind of precipitation method of range of application, has the wide characteristics in big, the suitable stratum of precipitation depth, is applicable to that transmission coefficient is 10
-4～10
2The m/d order of magnitude, stratum water yield are 10
-1～10
3m
3The various stratum of/d order of magnitude.
Traditional tube well dewatering all relies on action of gravity that underground water is compiled in pipe well, and the water that collects in the pipe well is discharged by suction pump.This precipitation mode does not possess the effect that the water of hydration of making is broken away from soil particle gravitation, can only extract a spot of gravity water out, and is relatively poor for the dewatering effect of the little clay of transmission coefficient, silty clay, clay silt layer.Along with the development of technology, tube well dewatering has been introduced the supplementary means of negative pressure of vacuum, has quickened underground water and has compiled in well, has improved drainage efficiency and dewatering effect.
But, in the existing vacuum precipitation method, because the sealing of downcomer well construction is difficult to be guaranteed, there is tangible technical weak link in the pipe well structure, can not form and remain powerful negative pressure gravitation relation between well casing inner chamber and the precipitation target zone, negative pressure of vacuum is only about 0.06MPa in the well casing of precipitation initial operating stage, the precipitation later stage in service only can maintain 0.04MPa or lower, therefore negative pressure of vacuum gravitation is not enough in whole pump process breaks away from soil particle so that be difficult to the water of hydration of pump drainage, and its water outlet effect is still undesirable; Be that just there is above-mentioned defective in disclosed a kind of concentric circles double-bushing vacuum deep well well point in the patent of invention of ZL200610118379.1 for example in the patent No., especially for main object---the saturated viscous soil horizon and the mealiness soil layer of drainage precipitation, the tube well dewatering water rate of this invention is not high, the radius of influence that draws water is little, the operation of drawing water is long in time limit, can not reach the desired target that reduces precipitation target zone water content significantly of drainage precipitation purpose.
Summary of the invention
At the defective that exists in the above-mentioned prior art, it is big that technical problem to be solved by this invention provides a kind of radius of influence that draws water, operation duration of drawing water is short, can realize the effective vacuum dewatering method of high water rate in little saturated viscous soil horizon of transmission coefficient and mealiness soil layer.
In order to solve the problems of the technologies described above, a kind of effective vacuum dewatering method provided by the present invention is characterized in that concrete steps are as follows:
1) sheathed strainer on the end of precipitation well well casing section tube coupling tube wall, and on the end of well casing section tube coupling tube wall, offer the water inlet that is communicated with strainer;
2) be drilled with the precipitation hole slot on ground, the drilling diameter of hole slot is greater than the design external diameter of strainer;
3) end section tube coupling with well casing lifts in the hole slot that is drilled with, and is placed on the hole slot center, adjunction well casing tube coupling one by one on the end of well casing section tube coupling then, until the well casing bottom arrive set the hole at the bottom of absolute altitude;
Wherein, the top section tube coupling tube wall of well casing is provided with pipe well recoil hole flushing, and this pipe well recoil hole flushing is with a Valve leakageproofing hermetic seal;
4) between well casing and the hole slot wall, insert filtrate between strainer and the hole slot wall;
5) suction pump is installed in well casing, and is made its water sucking mouth be higher than the water inlet of well casing;
6) in well casing, insert fluid level controller, and the control liquid level of fluid level controller is set according to the height of suction pump water sucking mouth;
7) the well casing top is sealed with a well lid anti-gas-leak, on well lid, offer the gutter that through hole is drawn the cable of the power line of fluid level controller, suction pump and connected the suction pump outfall, at floor mounted one vacuum pump, the vacuum tube of a connected well tube cavity is installed on well lid;
Wherein, the through hole on the well lid all adopts the anti-gas-leak sealing;
Wherein, the power line of fluid level controller is connected with the automatic switch of suction pump;
8) carry out clean-out service by pipe well recoil hole flushing, the valve sealing of hole flushing that after clean-out service finishes pipe well recoiled, and above filtrate, insert roof clay or clay ball;
9) air entry of vacuum tube and vacuum pump is connected;
10) open vacuum pump well casing is bled, make to present the condition of high vacuum degree negative pressure state in the well casing;
11) open when water level in the well casing rises to when setting high water level fluid level controller control suction pump, extract the water that compiles in the well casing out well casing, reduce to when setting low water stage fluid level controller control suction pump when water level in the well casing and close; Repeat this step, finish until the precipitation operation.
Further, in the described step 1, the section of prolonging strainer on also sheathed on the well casing tube wall above the strainer.
Further, in the described step 1, the bottom of the section of prolonging vacuum tube is provided with at least one closed air inlet on setting up the section of prolonging vacuum tube, be described in the inboard of the last section of prolonging strainer.
Further, in the described step 9, with on the air entry of the section of prolonging vacuum tube and vacuum pump also connect in the lump.
Further, in the described step 7, a vacuum meter is installed also on the vacuum tube on the well lid.
Further, in the described step 11, when the filtrate silting, in well casing, injects water under high pressure by pipe well recoil hole flushing and clean filtrate, or the clear water water level in well casing injects pressure-air cleaning filtrate when eligible in well casing.
Effective vacuum dewatering method provided by the invention, precipitation well well casing top is sealed with a well lid anti-gas-leak, and a vacuum tube is installed on well lid, vacuum pump is by the air in the vacuum tube extraction well casing when implementing precipitation, make and present the condition of high vacuum degree negative pressure state in the well casing, force water of hydration to break away from the adhesion of soil particle thereby produce powerful gravitation, water of hydration is compiled to pipe well rapidly together in company with gravity water; And because the water inlet of well casing is located at end section, thereby created condition for forming the water body packing, and can in drainage precipitation overall process, remain the negative pressure of vacuum that is not less than 0.08MPa, not only having quickened gravity water compiles to pipe well, and to also having good separating power with the stronger water of hydration of soil particle adhesion, thereby improved soil layer water rate and water outlet efficient, especially in little saturated viscous soil horizon of transmission coefficient and mealiness soil layer, water rate can have been improved 5～20 times; In addition, also obviously enlarged the radius of influence that draws water of this structure pipe well; Reaching under the prerequisite that reduces precipitation target zone water-content indicator, shortening the duration of the operation of drawing water.
Description of drawings
Fig. 1 is the schematic diagram of the effective vacuum dewatering method of the embodiment of the invention.
The specific embodiment
Below in conjunction with description of drawings embodiments of the invention are described in further detail, but present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
As shown in Figure 1, a kind of effective vacuum dewatering method that the embodiment of the invention provided is characterized in that,
Concrete steps are as follows:
1) sheathed strainer 2 on the end of precipitation well well casing 1 section tube coupling tube wall, and on the end of well casing 1 section tube coupling tube wall, offer the water inlet 3 that is communicated with strainer 2;
Wherein, according to the needs of the limiting time of drawing water in advance before base pit engineering border antiseepage environment and the excavation of foundation pit, also can be on sheathed on the well casing tube wall above the strainer 2 section of prolonging strainer, and can set up the section of prolonging vacuum tube in the inboard of the last section of prolonging strainer;
Wherein, the bottom of the section of prolonging vacuum tube is provided with at least one closed air inlet on;
Wherein, the type of strainer 2 can select bag net circular hole chimney filter strainer, (bag net) bridge-type chimney filter strainer or (bag net) circular hole chimney filter to twine a strainer etc. according to precipitation soil layer physical characteristic index;
2) be drilled with the precipitation hole slot on ground, the drilling diameter of hole slot greater than the design external diameter 300mm of strainer 2 or more than, the hole quality control criterion should meet the design document requirement;
3) end section tube coupling with well casing 1 lifts in the hole slot that is drilled with, and is placed on the hole slot center by device in holding up, adjunction well casing tube coupling one by one on the end of well casing 1 section tube coupling then, until the well casing bottom arrive set the hole at the bottom of absolute altitude;
Wherein, the top section tube coupling tube wall of well casing 1 is provided with pipe well recoil hole flushing, and this pipe well recoil hole flushing is with a Valve leakageproofing hermetic seal;
4) between well casing 1 and the hole slot wall, insert filtrate between strainer 2 and the hole slot wall;
5) suction pump 5 is installed in well casing 1, and is made its water sucking mouth be higher than the water inlet 3 of well casing 1;
6) in well casing 1, insert fluid level controller 6, and the control liquid level of fluid level controller 6 is set according to the height of suction pump 5 water sucking mouths;
7) well casing 1 top is sealed with a well lid anti-gas-leak, on well lid, offer the gutter that through hole is drawn the cable of the power line of fluid level controller 6, suction pump 5 and connected suction pump 5 outfall, at floor mounted one vacuum pump, the vacuum tube 7 of one connected well tube cavity is installed on well lid, and a vacuum meter is installed on vacuum tube 7;
Wherein, the through hole on the well lid all adopts the anti-gas-leak sealing;
Wherein, the power line of fluid level controller 6 is connected with the automatic switch of suction pump 5;
8) carry out clean-out service by pipe well recoil hole flushing, the valve sealing of hole flushing that after clean-out service finishes pipe well recoiled, and above filtrate, insert roof clay or clay ball;
9) vacuum tube 7 and the air entry of vacuum pump are connected, if in the apolegamy during section of prolonging vacuum tube, with on the also connection in the lump of air entry of the section of prolonging vacuum tube and vacuum pump;
10) open vacuum pump well casing 1 is bled, make to present the condition of high vacuum degree negative pressure state in the well casing, force water of hydration to break away from the adhesion of soil particle, water of hydration is compiled to well casing rapidly together in company with gravity water thereby produce powerful gravitation;
Wherein, the well casing internal pressure shows by vacuum meter, and the well casing internal pressure that shows when vacuum meter rises to when setting negative pressure value within a short period of time, illustrate comprise well casing vacuum system in order;
11) fluid level controller 6 control suction pumps 5 are opened when water level in the well casing 1 rises to the setting high water level, extract the water that compiles in the well casing 1 out well casing, and fluid level controller 6 control suction pumps 5 cut out when water level in the well casing 1 is reduced to the setting low water stage; Repeat this step, finish until the precipitation operation;
In the step 11 of the embodiment of the invention, when the filtrate silting, in well casing, injects water under high pressure by pipe well recoil hole flushing and clean filtrate, or the clear water water level in well casing injects pressure-air cleaning filtrate when eligible in well casing.
The embodiment of the invention at initial operating stage if water yield obviously greater than the water yield of conventional tube well construction, confirm that then underground water and the seepage flow between the well casing in the precipitation target zone have been in unimpeded state, the negative pressure in the well casing has produced the negative pressure graviational interaction to the body of groundwater in the stratum; If the precipitation operation in earlier stage, when vacuum meter continued to demonstrate condition of high vacuum degree, the water yield that is pooled in the well casing was very big, can judge that then the dewatering effect of pipe well manifests; Precipitation moves early stage, although still keep very high vacuum negative pressure condition in the well casing, the water yield that comes together in the well casing can reduce gradually, illustrates that the water content of the precipitation target zone soil body reduces gradually, belongs to normal phenomenon.
In the embodiment of the invention, with the well casing be the center around the dynamic water level curve of decline dynamic water level curve ratio traditional vacuum pipe well precipitation method in the soil layer mild.
Claims (6)
1. effective vacuum dewatering method is characterized in that concrete steps are as follows:
1) sheathed strainer on the end of precipitation well well casing section tube coupling tube wall, and on the end of well casing section tube coupling tube wall, offer the water inlet that is communicated with strainer;
2) be drilled with the precipitation hole slot on ground, the drilling diameter of hole slot is greater than the design external diameter of strainer;
3) end section tube coupling with well casing lifts in the hole slot that is drilled with, and is placed on the hole slot center, adjunction well casing tube coupling one by one on the end of well casing section tube coupling then, until the well casing bottom arrive set the hole at the bottom of absolute altitude;
Wherein, the top section tube coupling tube wall of well casing is provided with pipe well recoil hole flushing, and this pipe well recoil hole flushing is with a Valve leakageproofing hermetic seal;
4) between well casing and the hole slot wall, insert filtrate between strainer and the hole slot wall;
5) suction pump is installed in well casing, and is made its water sucking mouth be higher than the water inlet of well casing;
6) in well casing, insert fluid level controller, and the control liquid level of fluid level controller is set according to the height of suction pump water sucking mouth;
7) the well casing top is sealed with a well lid anti-gas-leak, on well lid, offer the gutter that through hole is drawn the cable of the power line of fluid level controller, suction pump and connected the suction pump outfall, at floor mounted one vacuum pump, the vacuum tube of a connected well tube cavity is installed on well lid;
Wherein, the through hole on the well lid all adopts the anti-gas-leak sealing;
Wherein, the power line of fluid level controller is connected with the automatic switch of suction pump;
8) carry out clean-out service by pipe well recoil hole flushing, the valve sealing of hole flushing that after clean-out service finishes pipe well recoiled, and above filtrate, insert roof clay or clay ball;
9) air entry of vacuum tube and vacuum pump is connected;
10) open vacuum pump well casing is bled, make to present the condition of high vacuum degree negative pressure state in the well casing;
11) open when water level in the well casing rises to when setting high water level fluid level controller control suction pump, extract the water that compiles in the well casing out well casing, reduce to when setting low water stage fluid level controller control suction pump when water level in the well casing and close; Repeat this step, finish until the precipitation operation.
2. method according to claim 1 is characterized in that: in the described step 1, and the section of prolonging strainer on also sheathed on the well casing tube wall above the strainer.
3. method according to claim 2 is characterized in that: in the described step 1, the bottom of the section of prolonging vacuum tube is provided with at least one closed air inlet on setting up the section of prolonging vacuum tube, be described in the inboard of the last section of prolonging strainer.
4. method according to claim 3 is characterized in that: in the described step 9, with on the air entry of the section of prolonging vacuum tube and vacuum pump also connect in the lump.
5. method according to claim 1 is characterized in that: in the described step 7, a vacuum meter is installed also on the vacuum tube on the well lid.
6. method according to claim 1, it is characterized in that: in the described step 11, when the filtrate silting, in well casing, injects water under high pressure by pipe well recoil hole flushing and clean filtrate, or the clear water water level in well casing injects pressure-air cleaning filtrate when eligible in well casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201019063046A CN101787702A (en) | 2010-02-08 | 2010-02-08 | Effective vacuum dewatering method |
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|---|---|---|---|
| CN201019063046A CN101787702A (en) | 2010-02-08 | 2010-02-08 | Effective vacuum dewatering method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002959A (en) * | 2010-12-21 | 2011-04-06 | 上海广联建设发展有限公司 | Draining device of underground structure foundation and layout method thereof |
| CN102051886A (en) * | 2011-01-24 | 2011-05-11 | 惠州市水电建筑工程有限公司 | Light well point drainage construction technology |
| CN103031850A (en) * | 2013-01-08 | 2013-04-10 | 中铁上海工程局有限公司 | Low-permeability sludge claypan ultra-vacuum dual-pipe unwatering well and construction technology |
| CN103276740A (en) * | 2013-05-29 | 2013-09-04 | 上海广联建设发展有限公司 | Combined type tube well dewatering system |
| CN104060621A (en) * | 2013-09-03 | 2014-09-24 | 中国建筑第四工程局有限公司 | Construction method for super vacuum dewatering well and well tube structure used in construction method |
| CN104420476A (en) * | 2013-08-27 | 2015-03-18 | 中建四局第一建筑工程有限公司 | Method and device using home-made small tube well to lower underground water level |
| CN106988329A (en) * | 2017-02-28 | 2017-07-28 | 中国十七冶集团有限公司 | A kind of ultra-large type piping lane groove construction precipitation system |
| CN108708385A (en) * | 2018-07-26 | 2018-10-26 | 河南省水利第工程局 | Integral type orients vacuum well point pipe |
| CN108930279A (en) * | 2017-05-27 | 2018-12-04 | 中国二十冶集团有限公司 | Deep foundation pit precipitation pipe well excavates rear enclosed method |
| CN110132650A (en) * | 2019-04-30 | 2019-08-16 | 同济大学 | A kind of contaminated site underground water gang of wells method of sampling |
| CN110318661A (en) * | 2019-04-24 | 2019-10-11 | 武汉一冶建筑安装工程有限责任公司 | Dewatering well construction method |
| CN110485448A (en) * | 2019-08-20 | 2019-11-22 | 中交第二公路工程局有限公司 | Automatic monitored control system and its application method for shield launching section end well precipitation |
| CN112012790A (en) * | 2020-09-02 | 2020-12-01 | 中铁第一勘察设计院集团有限公司 | Groundwater seepage control method for water-rich soft plastic loess tunnel based on drainage of dewatering well |
| CN114733890A (en) * | 2022-03-17 | 2022-07-12 | 湖南新九方科技有限公司 | Underground water restoration and monitoring channel structure for landfill area |
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2010
- 2010-02-08 CN CN201019063046A patent/CN101787702A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102002959B (en) * | 2010-12-21 | 2015-09-09 | 上海广联建设发展有限公司 | Underground structure substrate water draw-off and distribution method thereof |
| CN102002959A (en) * | 2010-12-21 | 2011-04-06 | 上海广联建设发展有限公司 | Draining device of underground structure foundation and layout method thereof |
| CN102051886A (en) * | 2011-01-24 | 2011-05-11 | 惠州市水电建筑工程有限公司 | Light well point drainage construction technology |
| CN102051886B (en) * | 2011-01-24 | 2012-08-15 | 惠州市水电建筑工程有限公司 | Light well point drainage construction technology |
| CN103031850A (en) * | 2013-01-08 | 2013-04-10 | 中铁上海工程局有限公司 | Low-permeability sludge claypan ultra-vacuum dual-pipe unwatering well and construction technology |
| CN103276740A (en) * | 2013-05-29 | 2013-09-04 | 上海广联建设发展有限公司 | Combined type tube well dewatering system |
| CN104420476A (en) * | 2013-08-27 | 2015-03-18 | 中建四局第一建筑工程有限公司 | Method and device using home-made small tube well to lower underground water level |
| CN104420476B (en) * | 2013-08-27 | 2016-05-18 | 中建四局第一建筑工程有限公司 | A kind of method and device that utilizes self-control tubule well lowering of watertable |
| CN104060621A (en) * | 2013-09-03 | 2014-09-24 | 中国建筑第四工程局有限公司 | Construction method for super vacuum dewatering well and well tube structure used in construction method |
| CN106988329A (en) * | 2017-02-28 | 2017-07-28 | 中国十七冶集团有限公司 | A kind of ultra-large type piping lane groove construction precipitation system |
| CN108930279B (en) * | 2017-05-27 | 2021-01-15 | 中国二十冶集团有限公司 | Method for sealing deep foundation pit downcast pipe well after excavation |
| CN108930279A (en) * | 2017-05-27 | 2018-12-04 | 中国二十冶集团有限公司 | Deep foundation pit precipitation pipe well excavates rear enclosed method |
| CN108708385A (en) * | 2018-07-26 | 2018-10-26 | 河南省水利第工程局 | Integral type orients vacuum well point pipe |
| CN108708385B (en) * | 2018-07-26 | 2024-01-19 | 河南省水利第一工程局 | Integrated directional vacuum well point pipe |
| CN110318661A (en) * | 2019-04-24 | 2019-10-11 | 武汉一冶建筑安装工程有限责任公司 | Dewatering well construction method |
| CN110132650A (en) * | 2019-04-30 | 2019-08-16 | 同济大学 | A kind of contaminated site underground water gang of wells method of sampling |
| CN110132650B (en) * | 2019-04-30 | 2021-11-09 | 同济大学 | Sampling method for underground water well group in polluted site |
| CN110485448A (en) * | 2019-08-20 | 2019-11-22 | 中交第二公路工程局有限公司 | Automatic monitored control system and its application method for shield launching section end well precipitation |
| CN112012790A (en) * | 2020-09-02 | 2020-12-01 | 中铁第一勘察设计院集团有限公司 | Groundwater seepage control method for water-rich soft plastic loess tunnel based on drainage of dewatering well |
| CN114733890A (en) * | 2022-03-17 | 2022-07-12 | 湖南新九方科技有限公司 | Underground water restoration and monitoring channel structure for landfill area |
| CN114733890B (en) * | 2022-03-17 | 2024-04-09 | 湖南新九方科技有限公司 | Underground water restoration and monitoring channel structure in landfill area |
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Open date: 20100728 |