CN101215833A - Gas injection type vacuum precipitation method - Google Patents
Gas injection type vacuum precipitation method Download PDFInfo
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- CN101215833A CN101215833A CNA2008100326585A CN200810032658A CN101215833A CN 101215833 A CN101215833 A CN 101215833A CN A2008100326585 A CNA2008100326585 A CN A2008100326585A CN 200810032658 A CN200810032658 A CN 200810032658A CN 101215833 A CN101215833 A CN 101215833A
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Abstract
The invention relates to a gas-filled vacuum dewatering method and a device, which uses a gas-filling system to fill gas to soil mass to accelerate vacuum dewatering as a new method of groundwork treatment. The method comprises: finishing the ground; installing a traditional vacuum dewatering system; simultaneously installing the gas-filling system, that is, connecting a gas-filling pipe, a gas-filling mouth and a filling head of each gas-filling point, inserting the above parts into soil mass in the middle position between well pipes, then connecting all gas-filling pipes and gas-supplying devices through soft pipes; starting vacuum pump, gas-supplying device, and starting the vacuum water drawing of the well pipe, the gas-filling pipe starts to fill pressure gas; during the gas filling, gradually raising gas filling pressure according to vacuum draining conditions; processing gas-filling vacuum dewatering till no water is discharged and closing all vacuum pumps and gas-supplying devices. The invention has simple implement technique, low construction cost and larger dewatering depth compared with the prior vacuum dewatering method, and is suitable for underground dewatering of each kind of groundwork.
Description
Technical field
The present invention relates to a kind of underground water precipitation technology, particularly a kind of pressure gas injection system that is used to strengthen drainage efficiency belongs to technical field of civil engineering.
Background technology
In recent years, riverine, coastal each metropolis economy and infrastructure are flourish, and further urban development planning arranged, engineering construction scales such as harbour, airport, road enlarge day by day, the land-based area land used more and more can not be satisfied the demand, the mud that dredging is come out is used for the land-based area of sea reclamation or structure bunder, and this has become the important means of land development.But the sand of hydraulic reclamation or mud on the beach, water content height, soil property are relatively poor, if not treated, generally are difficult to satisfy the requirement of engineering construction to ground.The geotechnical engineering problems relevant with barged-in fill is more and more outstanding, and key problem is effective processing of barged-in fill.
The reinforcement measure of barged-in fill ground mainly contains methods such as two an ash method, deep-mixed pile, piling prepressing, vacuum preloading, precipitating, pre-pressing, electric drainage, vacuum-dewatering associating dynamic compaction.But, because the soil property of barged-in fill ground is often very poor, fixed performance is bad, directly using method precipitation such as vacuum, electric osmose all is difficult to prove effective, use two an ash method, also effect is undesirable for deep-mixed pile, so general employing large tracts of land preloading or vacuum method in using, but its draining is slower, and consolidation time needs 1～3 year.Therefore, if can further effectively solve the precipitation problem of soft foundation, so in conjunction with cheap, speed of application is fast, consolidation effect is the dynamic compaction of characteristics well, can reach good effect so that ground is handled.As seen, in ground was handled, precipitation method was most important.Simultaneously, in base pit engineering and other underground construction, also need precipitation method efficiently, with the reduction of erection time.
Precipitation method has a lot, mainly contains light well point precipitation, vacuum-dewatering, eductor well point precipitation, electric osmose well-points dewatering and tube well dewatering, and wherein vacuum-dewatering is used very general.Vacuum-dewatering is based on the light well point precipitation system, sets up the vacuum pump of a high capacity in system, carries out the drainage system that falls that work raises the efficiency by an equalizer (moisture separator).The vacuum pump capacity is not less than 100L/s, system vacuum Du Keda 65kPa～90kPa, and also the someone is referred to as high vacuum, even in the lower clay of transmission coefficient, also can accelerate phreatic seepage flow by the new water table gradient that forms.For the stronger sand foundation of permeability, the efficient of vacuum-dewatering is very high, but along with the infiltrative reduction of ground, its precipitation efficiency also will reduce greatly.How to improve precipitation efficiency, this has become one of major issue in the ground processing.For this reason, the present invention adopts to the inner injection pressure gas of ground, under the double action of bigger gas pressure and vacuum well point pipe negative pressure, can improve the seepage flow water table gradient in the soil body greatly, and drainage efficiency is significantly improved, thereby the precipitation duration also obviously shortens.
Summary of the invention
Traditional vacuum precipitation method mainly is applicable to the sandy subgrade that water permeability is stronger, and for the ground of other soil property, its precipitation time is long, efficient is very low.The present invention sets up a kind of device that is used for to inside soil body injection pressure gas on traditional vacuum precipitation method basis, a kind of new method that can significantly improve drainage efficiency, shorten the vacuum-dewatering time is provided.
Efficient precipitation purpose of the present invention is to be achieved through the following technical solutions:
Gas injection type vacuum precipitation method, by realizing precipitation: carry out vacuum by the well point pipe on one side and draw water to the inner injection pressure gas of foundation soil body, on one side by gas injection device injection pressure gas, the two forms the seepage field of high gradient in the precipitation zone, force water in soil to shift, thereby reach forced drainage purpose fast to the vacuum well point pipe.
Gas injection type vacuum precipitation method of the present invention is: the unsaturated soil that forms big zone around the air injection opening, after stopping gas injection, water in soil moves to the lower of non-saturated region, groundwater table will decline to a great extent, be starkly lower than pipe bottom, vacuum well point, its groundwater table reduces the degree of depth also apparently higher than traditional vacuum precipitation method.
Gas injection device of the present invention is made up of feeder, air injection pipe, air injection opening and injection head, and air injection pipe, air injection opening and injection head are connected the back in turn and insert in the soil body, and air injection pipe is inserted the status requirement decision of the degree of depth of the soil body by air injection opening.The position of air injection opening should be lower than pipe bottom, well point, 0.2～2.0 times of the desirable well point of its depth difference tube pitch.Air injection pipe is installed in the center between the pipe of well point.The air injection opening diameter is less than air injection pipe, the injection head at two ends, and the soil body stops up the injecting hole of air injection opening in gas injection device injection soil body process to avoid " middle thin, two pluckings ".The material of air injection pipe, air injection opening and injection head can be hard metal or rigid plastics.
Compare with traditional vacuum precipitation method, simple to operate, the easy construction of the present invention, and have following outstanding advantage:
1). the present invention can quicken the drainage efficiency of water in soil, shortens the precipitation time of ground.Processing method of the present invention, key is to inside soil body injection pressure gas, by the high gradient field of bigger gas pressure and vacuum well point pipe negative pressure formation seepage flow, improves the speed that water in soil moves to the well point pipe greatly, shorten precipitation time, improved precipitation efficiency.
2). precipitation depth of the present invention is bigger.Because air injection pipe of the present invention bottom is lower than pipe bottom, vacuum well point, will around air injection opening, form the unsaturated soil in big zone in the gas injection process, so, after gas injection type vacuum precipitation finishes, the above underground water in pipe bottom, well point can flow to this non-saturated region under action of gravity, precipitation depth will be apparently higher than traditional vacuum-dewatering degree of depth.
3). the present invention has enlarged the suitable ground scope of vacuum-dewatering.For the clay soil ground, traditional vacuum-dewatering efficient is very low.Adopt gas injection type vacuum precipitation method of the present invention, then its suitable soil property scope can expand the clay soil ground to.
4). the invention process is easy, cost is low.Because the main device of the present invention is a gas injection system, the air injection pipe diameter is less, and it is buried underground and convenient disassembly, and the gas flow that needs in the gas injection and little, so in general, several air compressor machines just can satisfy the requirement of construction.
Description of drawings
The operating principle figure of Fig. 1 gas injection type vacuum precipitation method.
Groundwater table schematic diagram after Fig. 2 gas injection type vacuum precipitation has just finished.
The air injection opening of a Fig. 3 gas injection system and injection schematic diagram.
The plan-position schematic diagram of Fig. 4 air injection pipe and well point pipe.
The specific embodiment
The present invention is on the basis of traditional vacuum precipitation method, sets up a kind of device that is used for to inside soil body injection pressure gas, forms a kind of novel gas injection type vacuum precipitation method.This processing method has only been set up gas injection system on original vacuum-dewatering system-based, so its enforcement is comparatively convenient.Shown in Fig. 1～3, wherein have: 1. feeder; 2. air injection pipe; 3. air injection opening; 4. injection head; 5. vacuum pump; 6. manage the well point; 7. filter screen; 8. ground.
Precipitation system among the present invention mainly is made up of two parts: gas injection system and traditional vacuum-dewatering system.The vacuum-dewatering system mainly is made up of vacuum pump 5, well point pipe 6, filter screen 7, and gas injection system mainly is made up of feeder 1, air injection pipe 2, air injection opening 3 and injection 4.Air injection pipe is hard material (as metal pipe material, plastic pipe, a composite pipe), adopts the more piece splicing, and diameter is less, is generally 1.5～3.0cm, and for the bigger ground of the degree of depth, the air injection pipe diameter can suitably strengthen.As shown in Figure 3, air injection opening (white segment) and injection head (gray segments) are dismountable, and air injection pipe, air injection opening and injection head join in turn, and the injection head is beneficial to gas injection device and inserts the soil body.An injection diameter is identical with air injection pipe, total length is 3～10 times of air injection pipe diameter, and air injection opening is the pipe that tube wall is drilled with injecting hole, the pipe diameter is 0.5～0.8 times of air injection pipe diameter, the air injection opening total length is 3～7 times of air injection pipe diameter, aperture 0.5～the 2.0mm of injecting hole, the injecting hole spacing is got 5～20 times of aperture.Because the air injection opening diameter is all littler than air injection pipe, the injection head at two ends, so middle thin, two pluckings, this can be avoided, and the soil body stops up the injecting hole of air injection opening in gas injection device injection soil body process.Air injection pipe is inserted the status requirement decision of the degree of depth of the soil body by air injection opening.Because gas up walks easily, so in burying underground, the air injection opening position should be lower than pipe bottom, well point, 0.2～2.0 times of the desirable well point of its depth difference tube pitch.The purpose of gas injection system is to improve vacuum-dewatering efficient, so air injection pipe and well point pipe are staggeredly arranged (as Fig. 4) in the plane, air injection pipe is installed in the center between the pipe of well point.
Fig. 1 has illustrated the operating principle of gas injection type vacuum precipitation system.When pressed gas was injected into inside soil body, gas can occupy native mesopore to diffusion all around in soil, and the water in the soil is pushed at a distance.The figure Oxford gray is partly represented moisture more zone in the soil layer.Because there has been bigger negative pressure the well point near the pipe bottom, so inject the easier past well point of the gas of soil body tube side, force the water in soil of this section to move to the well point pipe fast simultaneously to diffusion, realize quick draining.If suitably increase gas injection pressure, the soil body also may produce splitting so, radial microscopic checks occurs, and this will strengthen the water permeability of the soil body, quickens water in soil and moves to the well point pipe, thereby improved drainage efficiency.Simultaneously, because continuously to inside soil body injection pressure gas, so certainly will form the unsaturated soil zone in big zone near air injection opening, this will very help the increase of foundation strength.
Fig. 2 has illustrated gas injection type vacuum precipitation just to finish groundwater table situation soon.When gas injection finishes, in the above soil body in pipe bottom, well point, also there is a part of water in soil, under action of gravity, will flow to formed unsaturation zone in the gas injection process, and then make phreatic line between the pipe of well point, form a trench, water level further reduces, and this obviously is better than the traditional vacuum dewatering effect.After traditional vacuum-dewatering just finished, water level did not have big reduction, and the water level between the pipe of well point is apparently higher than the water level at well point pipe place, so its water level reduces the degree of depth will be starkly lower than the novel precipitation depth that gas injection type vacuum precipitation method reached.
The gas injection pressure maximum value can not puncture overburden layer, otherwise the gas that injects makes pressed gas can't hold in soil if break through soil layer, the effect of gas injection failure so.Therefore, determining of gas injection pressure need be determined maximum gas injection pressure in conjunction with field trial according to soil layer property, groundwater table and air injection opening position in engineering.When lacking test, 1.2～5 times of the native mesopore water pressure at the general desirable air injection opening degree of depth of the gas injection pressure in gas injection process place, get low value in the time of the beginning gas injection, increase force value in the gas injection process gradually, when pipe water outlet in well point seldom the time, can increase gas injection pressure and improve drainage speed.
Concrete implementation step of the present invention is as follows:
1). smooth place;
2). traditional vacuum-dewatering system is installed;
3). when the vacuum-dewatering system is installed, can carry out the installation of gas injection system: the air injection pipe, air injection opening and the injection head that connect each gas injection point, and in the insertion of the center between the pipe of the well point soil body, afterwards all air injection pipe are connected with flexible pipe with feeder;
4). start vacuum pump and feeder, well point pipe beginning vacuum is drawn water, and air injection pipe begins injection pressure gas;
5). in the gas injection process, progressively improve gas injection pressure according to the vacuum drainage situation;
6). carry out gas injection type vacuum precipitation, till not having current to discharge, close vacuum pump and feeder.
Claims (10)
1. a vacuum precipitation method is characterized in that gas injection system also being installed to soil body injection pressure gas when traditional vacuum-dewatering system is installed, impels water in soil to shift to the vacuum well point pipe.
2. the method for claim 1 is characterised in that this processing method comprises following steps:
1) smooth place;
2) traditional vacuum-dewatering system is installed;
3) when the vacuum-dewatering system is installed, gas injection system is installed: connect air injection pipe, air injection opening and the injection head of each gas injection point in turn, insert in the soil body, afterwards all air injection pipe are connected with flexible pipe with feeder;
4) start vacuum pump and air injection device, well point pipe beginning vacuum is drawn water, and air injection pipe begins injection pressure gas;
5) in the gas injection process, progressively improve gas injection pressure according to the vacuum drainage situation;
6) carry out gas injection type vacuum precipitation, gas injection pressure is brought up to peak till not having current to discharge, close vacuum pump and air injection device.
3. method as claimed in claim 1 or 2 is characterized in that gas injection pressure need determine maximum gas injection pressure in conjunction with field trial according to soil layer property, groundwater table and air injection opening position in engineering.
4. method as claimed in claim 3 is characterized in that, the gas injection pressure in the gas injection process is got 1.2～5 times of native mesopore water pressure at air injection opening degree of depth place, gets low value in the time of the beginning gas injection, increases force value in the gas injection process gradually to peak; When pipe water outlet in well point seldom the time, then increase gas injection pressure and improve drainage speed.
5. realize the gas injection system of claim 1 or 2 described methods, it is characterized in that comprising feeder, air injection pipe, air injection opening and injection head, air injection pipe, air injection opening and injection head are connected the back in turn insert in the soil body.
6. gas injection system as claimed in claim 5 is characterized in that the status requirement decision of the degree of depth of the air injection pipe insertion soil body by air injection opening, and the air injection opening position is lower than pipe bottom, well point, and the depth difference bottom manage air injection opening and well point is got 0.2～2.0 times of well point tube pitch.
7. gas injection system as claimed in claim 5 is characterized in that air injection pipe is installed in the center between the pipe of well point; Preferred air injection pipe network is evenly distributed among the managed network of well point.
8. gas injection system as claimed in claim 5 is characterized in that air injection pipe, the injection head of air injection opening diameter less than two ends, and the soil body stops up the injecting hole of air injection opening in gas injection device injection soil body process to avoid to form the structure of " middle thin, two pluckings ".
9. gas injection system as claimed in claim 5, the external diameter that it is characterized in that the injection head is identical with the air injection pipe external diameter, be between 1.5～3.0cm, an injection total length is 3～10 times of air injection pipe diameter, air injection opening is the pipe that tube wall is drilled with injecting hole, and the pipe diameter is 0.5～0.8 times of air injection pipe external diameter, and the air injection opening total length is 3～7 times of air injection pipe external diameter, aperture 0.5～the 2.0mm of injecting hole, the injecting hole spacing is 5～20 times of aperture.
10. gas injection system as claimed in claim 5 is characterized in that the material that constitutes air injection pipe, air injection opening and injection head comprises hard metal or rigid plastics.
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| CNA2008100326585A CN101215833A (en) | 2008-01-15 | 2008-01-15 | Gas injection type vacuum precipitation method |
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| CNA2008100326585A CN101215833A (en) | 2008-01-15 | 2008-01-15 | Gas injection type vacuum precipitation method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101851914A (en) * | 2010-06-09 | 2010-10-06 | 天津大学 | Method for regulating and controlling ventilating transformation and quickly reinforcing dredger fill in vacuum |
| CN103061324A (en) * | 2013-01-28 | 2013-04-24 | 河海大学 | Underground-inflated liquefied foundation treating device and construction method |
| CN103437338A (en) * | 2013-08-28 | 2013-12-11 | 东南大学 | Reinforcing dredger fill foundation construction method combining drainage well and air pressure splitting |
| CN103866757A (en) * | 2014-04-10 | 2014-06-18 | 宜兴市良旭焊接瓷件有限公司 | Soil dehydration desiccation or solidification method |
| CN104452740A (en) * | 2014-11-21 | 2015-03-25 | 淮海工学院 | Method for reinforcing and treating liquefied sandy soil foundation |
| CN105220678A (en) * | 2015-09-15 | 2016-01-06 | 浙江开天工程技术有限公司 | A kind of processing method of soil body sclerosis |
| 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 |
| CN106677156A (en) * | 2016-12-27 | 2017-05-17 | 吴慧明 | Method for conducting disturbance treatment on soft soil foundation through aerosol |
| CN109837919A (en) * | 2019-01-06 | 2019-06-04 | 许增荣 | The technology of liquid in gas injection drive row Rock And Soil |
| CN110984117A (en) * | 2019-11-25 | 2020-04-10 | 浙江大学 | Device and method for soft soil foundation treatment |
| CN113089637A (en) * | 2021-02-23 | 2021-07-09 | 中铁十九局集团第三工程有限公司 | Water pumping device and water pumping system for soil solidification |
| CN113431019A (en) * | 2021-06-03 | 2021-09-24 | 上海市基础工程集团有限公司 | A pressurization gas injection device for quick drainage of soil body |
| CN113463673A (en) * | 2021-05-27 | 2021-10-01 | 中铁十九局集团第三工程有限公司 | High vacuum system combined densification method foundation treatment method and device |
| CN114411689A (en) * | 2021-12-24 | 2022-04-29 | 河海大学 | Self-tunneling gas injection anti-liquefaction treatment device for building foundation and construction method |
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2008
- 2008-01-15 CN CNA2008100326585A patent/CN101215833A/en active Pending
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101851914A (en) * | 2010-06-09 | 2010-10-06 | 天津大学 | Method for regulating and controlling ventilating transformation and quickly reinforcing dredger fill in vacuum |
| CN103061324A (en) * | 2013-01-28 | 2013-04-24 | 河海大学 | Underground-inflated liquefied foundation treating device and construction method |
| CN103437338A (en) * | 2013-08-28 | 2013-12-11 | 东南大学 | Reinforcing dredger fill foundation construction method combining drainage well and air pressure splitting |
| CN103437338B (en) * | 2013-08-28 | 2015-05-06 | 东南大学 | Reinforcing dredger fill foundation construction method combining drainage well and air pressure splitting |
| CN103866757A (en) * | 2014-04-10 | 2014-06-18 | 宜兴市良旭焊接瓷件有限公司 | Soil dehydration desiccation or solidification method |
| CN103866757B (en) * | 2014-04-10 | 2015-10-14 | 宜兴市良旭焊接瓷件有限公司 | The method of soil water desorption mummification or solidification |
| CN104452740A (en) * | 2014-11-21 | 2015-03-25 | 淮海工学院 | Method for reinforcing and treating liquefied sandy soil foundation |
| CN105220678A (en) * | 2015-09-15 | 2016-01-06 | 浙江开天工程技术有限公司 | A kind of processing method of soil body sclerosis |
| 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 |
| 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 |
| CN106677156A (en) * | 2016-12-27 | 2017-05-17 | 吴慧明 | Method for conducting disturbance treatment on soft soil foundation through aerosol |
| CN106677156B (en) * | 2016-12-27 | 2018-12-11 | 吴慧明 | A method of disturbance treatment being carried out to soft soil foundation using aerosol |
| CN109837919A (en) * | 2019-01-06 | 2019-06-04 | 许增荣 | The technology of liquid in gas injection drive row Rock And Soil |
| CN110984117A (en) * | 2019-11-25 | 2020-04-10 | 浙江大学 | Device and method for soft soil foundation treatment |
| US11085161B2 (en) | 2019-11-25 | 2021-08-10 | Zhejiang University | Device and method for treating soft soil foundations |
| CN113089637A (en) * | 2021-02-23 | 2021-07-09 | 中铁十九局集团第三工程有限公司 | Water pumping device and water pumping system for soil solidification |
| CN113463673A (en) * | 2021-05-27 | 2021-10-01 | 中铁十九局集团第三工程有限公司 | High vacuum system combined densification method foundation treatment method and device |
| CN113431019A (en) * | 2021-06-03 | 2021-09-24 | 上海市基础工程集团有限公司 | A pressurization gas injection device for quick drainage of soil body |
| CN114411689A (en) * | 2021-12-24 | 2022-04-29 | 河海大学 | Self-tunneling gas injection anti-liquefaction treatment device for building foundation and construction method |
| CN114411689B (en) * | 2021-12-24 | 2022-11-11 | 河海大学 | Self-tunneling gas injection anti-liquefaction treatment device for building foundation and construction method |
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Open date: 20080709 |