CN102116022B - Method for treating soft foundation through overpressure vacuum densification - Google Patents
Method for treating soft foundation through overpressure vacuum densification Download PDFInfo
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- CN102116022B CN102116022B CN2011100069094A CN201110006909A CN102116022B CN 102116022 B CN102116022 B CN 102116022B CN 2011100069094 A CN2011100069094 A CN 2011100069094A CN 201110006909 A CN201110006909 A CN 201110006909A CN 102116022 B CN102116022 B CN 102116022B
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Abstract
The invention provides a method for treating soft foundation through overpressure vacuum densification. The technology comprises the following contents: arranging a pressure boosting system and utilizing an air compressor to directly convey high-pressure air to pressure boosting tubes via ducts, wherein the pressure boosting system is formed by arranging certain quantity of microporous pressure boosting tubes with certain depth among longitudinal drainage boards; and rubber sealing membranes are sleeved outside the pressure boosting tubes; and while carrying out vacuum preloading on the soft foundation, adopting the pressure boosting system to laterally boost pressure on the soft soil to ensure the water molecules in the soil body to flow directionally to speed up soil body solidification. By using the method, the preloading effect of vacuum combined with surcharge preloading under 80-120kPa can be achieved. By utilizing the technology, solidification is speeded up, the solidification effect is improved and the rapid, efficient, energy-saving and environment-friendly construction process is realized.
Description
Technical field
The present invention relates to a kind of superpressure vacuum-densified flexible foundation treatment method, mainly be applicable to weak soil or super soft ground, belong to the geotechnical engineering field.
Background technology
Along with China adds December calendar year 2001
WTO , the foreign economic rapid growth, China's coastal port has welcome a brand-new developing period, and large-scale Scale Sea Reclamation Project and littoral zone exploration project are flourish.Dalian, Tianjin, Jiangsu, Zhejiang and Guangdong etc. are coastal all at reclaiming land around sea on a large scale.Mostly these areas are the mud matter class weak soil of high-moisture, high-compressibility.The economic construction of China's high speed development is badly in need of wanting subgrade treatment technologies quick, efficient, energy-saving and environmental protection.In the eighties mid-term in last century, the technique of soft soil foundation treatment that grows up is through the development of nearly two more than ten years and constantly perfect.Develop into vacuum combined stack-load, the vacuum combined worker's methods such as water treatment, low position vacuum preloading, directly discharging type vacuum prepressing of covering from single vacuum method.Make it in practical applications, obtain success, and be widely used in the treatment of soft foundation engineering of Scale Sea Reclamation Project.
Find through practical application,, also have bigger limitation though conventional vacuum preloading law technology is a kind of effective soft foundation processing technology.For handling the soft base of the degree of depth less than 15m, consolidation process need consume a large amount of medium coarse sand bed courses, needs a large amount of electric energy of consumption and need the long construction period.Handle the soft base that the degree of depth surpasses 15m, because the linear loss of vacuum, the deep is difficult to obtain effective consolidation effect again, and the processing time is often longer, has satisfied not the needs of engineering practical application.Therefore, research and development subgrade a kind of fast, efficient, energy-saving and environmental protection is handled the active demand that new technology is the existing market development.The present invention has quickened the directed flow of hydrone in the soil body through adopting supercharging technology, has accelerated soil solidifying, has shifted to an earlier date the duration, has saved electric energy.Also improved the consolidation effect that deep soft foundation is handled simultaneously.
Summary of the invention
The present invention relates to a kind of superpressure vacuum-densified flexible foundation treatment method, this method has been quickened the directed flow of hydrone in the soil body, has accelerated soil solidifying.
For realizing above-mentioned purpose, mainly increased the foundation soil body pressurization system in the scheme that the present invention adopts.
This pressurization system be between the longitudinal drainage plate according to strata condition, design the quantity of pressure inlet, the degree of depth that pressure inlet plugs, the position and the supercharging frequency of supercharging.Pressure inlet adopt steel pipe or
PVC Pipe is processed, and sidewall is by triangular arrangement
Φ 3-5mmCircular hole, tube wall segmentation overcoat rubber sealing film.Pressure inlet is gone into through the intubate machine transplanting of rice.The sealing of pressure inlet bottom, top links to each other with conduit, and conduit adopts
Φ 8-10mmWired hose, conduit gather the back and directly are connected with air compressor machine through going out film device.Gases at high pressure are transferred in the pressure inlet through conduit during work, through the expansion of pressure inlet outer rubber film, weak soil are produced the side direction supercharging, and the pressure inlet internal pressure is controlled at
0～40kPa, the level of rubber membrane is managed internal pressure to displacement and is changed to
0～10cmUnder the lateral pressure extruding, make the hydrone directed flow in the soil body, quicken soil solidifying.
The concrete steps of this method are: on the ground that will handle, lay establishment cloth or geotextiles; If vertical plastic draining board; The level that is provided with is to drainage system; Pressurization system is set; The shop vacuum diaphragm; Utilize air compressor machine supercharging in pressurization system; Utilize the water of vacuum pump eliminating level in drainage system.
Pressurization system is that the pressure inlet sidewall is porose, wall overcoat rubber sealing film at the pressure inlet of vertically arranging some, certain depth between plastic draining board.
The sealing of pressure inlet bottom, top links to each other with conduit, and conduit gathers the back and directly is connected with air compressor machine through going out film device.
Can use in this invention medium coarse sand bed course in traditional vacuum preloading as level to drainage system and vacuum transmission system; Also can the transverse drainage plate be responsible for the drainage system of forming; At this moment; The transverse drainage plate is a level to the plastic draining board of arranging two overlapping placements as an interface channel, and the longitudinal drainage wrench that directly both sides is set sandwiches above-mentioned level between the plastic draining board of two overlapping placements of arranging, adopts nailing to fix; The outside is twined the filter membrane parcel again, and transverse drainage plate two ends directly are connected with main filter pipe.
Owing to adopted supercharging technology to strengthen soil body pressure reduction among the present invention, can reach vacuum combined stack-load
80～120kPaThe precompressed effect, realize surcharge preloading, accelerate soil solidifying, the reduction of erection time is near
40%The invention technology mainly is applicable in the weak soil or super soft ground engineering in the building projects such as harbour, iron fall, highway, water conservancy, airport.
Description of drawings
Fig. 1:Organigram of the present invention.
Among the figure: 1, vacuum extractor 2, high-pressure pump 3, level are to drainage system 4, pressure inlet and rubber membrane 5, diaphragm seal 6, the person in charge 7, vertical plastic draining board 8, transverse drainage plate.
The specific embodiment
Certain engineering adopts superpressure vacuum-densified flexible foundation treatment method following: the layout level is to plastic draining board and chimney filter drainage system or the sand bedding course drainage system is set, and the filter membrane aperture design does
80～100 μ m , reinforcement depth 29m, top 6m adopts pressurization system, and micropore supercharging 40kPa reaches 110kPa, maximum settlement amount 2.68m through bearing capacity after 90 days consolidation process.
Concrete constructing operation step is following:
⑴, through machinery the field is flattened, planeness reaches 5 ‰.
⑵, laying one deck woven cloth; If handle ultra-soft foundation, then arrange the 200-300g geotextiles, utilize the plastic foam of filter membrane parcel to enclose low bank between fields as manual work.
⑶, carry out longitudinal drainage plate construction, according to geological conditions calculate confirm to set plastic draining board spacing, the degree of depth and employed band drain specifications and models.The plastic draining board protruded length is confirmed according to spacing, is generally 40～60cm, and wrench and parcel filter cloth require complete, concordant, and must not having into, the mud phenomenon occurs.
⑷, level be to the setting of drainage system, adopts thickness 4.0 ± 0.2mm, width 100 ± 2mm, vertical water-flowing amount>=60cm
3/ s, transmission coefficient>=5 * 10
-3Cm/s, effective aperture are (with O
98Meter) two overlapping placements of wide cut plastic draining board of 80～100 μ m are as the transverse drainage plate; The transverse drainage plate is positioned between two row's longitudinal drainage plates; The longitudinal drainage wrench that both sides are exposed folds up between overlapping wide cut plastic draining board; Wrench is placed relatively, and the outside is fixed itself and transverse row water body with nailing, and the parcel filter membrane makes it to form an integral body in the transverse drainage plate outside.In the both side ends of transverse drainage plate, link to each other with being responsible for connector, form a level to drainage system.
⑸, pressurization system setting.Be between the longitudinal drainage plate according to strata condition, design goes out the quantity of pressure inlet, the degree of depth that pressure inlet plugs, the position and the supercharging frequency of supercharging.Pressure inlet adopts steel pipe or pvc pipe to process, and sidewall is by triangular arrangement Φ 5mm circular hole, tube wall segmentation overcoat rubber sealing film.Pressure inlet is gone into through the intubate machine transplanting of rice.The sealing of pressure inlet bottom, top links to each other with conduit, and conduit adopts Φ 10mm wired hose, and conduit gathers the back and directly is connected with air compressor machine through going out film device.Gases at high pressure are transferred in the pressure inlet through conduit during work, through the expansion of pressure inlet outer rubber film, weak soil are produced the side direction supercharging, and the pressure inlet internal pressure is controlled at 40kPa, and the level of rubber membrane is managed internal pressure to displacement and is changed to 0～8cm.Under the lateral pressure extruding, make the hydrone in the soil body produce directed flow.
⑹, laying diaphragm seal, the diaphragm seal quality adheres to specification, in factory's heat seal one-shot forming.With the diaphragm seal of prior compression moulding, divide two-layer laying, to consider that sedimentation causes the deformation requirements to film during the film of shop.The two layers of plastic film all should be imbedded and press backfill compacting in the unconcerned ditch.
⑺, peace jet pump, vacuum suction.Arrange jet vacuum pump by designing requirement, turn on pump carries out vacuum suction.Reach 110kPa, maximum settlement amount 2.68m through bearing capacity after 90 days consolidation process.
Claims (3)
1. a superpressure vacuum-densified flexible foundation treatment method is characterized in that, may further comprise the steps: on the ground that will handle, lay establishment cloth or geotextiles; If vertical plastic draining board; Level is set to drainage system at the foundation surface that will handle; Pressurization system is set; The shop vacuum diaphragm; Utilize air compressor machine supercharging in pressurization system; Utilize the water of vacuum pump eliminating level in drainage system; Level is medium coarse sand bed course, transverse drainage plate and is responsible for the drainage system of forming to drainage system; The transverse drainage plate is a level to the plastic draining board of arranging two overlapping placements as an interface channel; The longitudinal drainage wrench that directly both sides is set sandwiches above-mentioned level between the plastic draining board of two overlapping placements of arranging; The employing nailing is fixed; The outside is twined the filter membrane parcel again, and transverse drainage plate two ends directly are connected with main filter pipe.
2. method according to claim 1 is characterized in that, pressurization system is that the pressure inlet sidewall is porose, wall overcoat rubber sealing film at the pressure inlet of vertically arranging some, certain depth between plastic draining board.
3. method as claimed in claim 2 is characterized in that, the sealing of pressure inlet bottom, and top links to each other with conduit, and conduit gathers the back and directly is connected with air compressor machine through going out film device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100069094A CN102116022B (en) | 2011-01-13 | 2011-01-13 | Method for treating soft foundation through overpressure vacuum densification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100069094A CN102116022B (en) | 2011-01-13 | 2011-01-13 | Method for treating soft foundation through overpressure vacuum densification |
Publications (2)
| Publication Number | Publication Date |
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| CN102116022A CN102116022A (en) | 2011-07-06 |
| CN102116022B true CN102116022B (en) | 2012-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100069094A Expired - Fee Related CN102116022B (en) | 2011-01-13 | 2011-01-13 | Method for treating soft foundation through overpressure vacuum densification |
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| CN102707034B (en) * | 2012-05-31 | 2014-07-09 | 东南大学 | Indoor model testing device and testing method employing air-pressure splitting vacuum preloading method |
| CN103015400B (en) * | 2013-01-11 | 2015-07-15 | 谭再坤 | Efficient quick method for treating separated directly-connected vacuum preloaded foundation |
| CN103074883B (en) * | 2013-01-11 | 2016-01-06 | 温州大学 | Active piling prepressing united consolidated subsoil method |
| CN103074884A (en) * | 2013-01-11 | 2013-05-01 | 温州大学 | Deep decompression anatonosis type vacuum preloading foundation treatment method |
| CN103061324A (en) * | 2013-01-28 | 2013-04-24 | 河海大学 | Underground-inflated liquefied foundation treating device and construction method |
| CN103388330B (en) * | 2013-07-31 | 2015-09-23 | 河海大学 | Pump-drainage type vacuum prepressing reinforcement soft base method |
| CN103866759B (en) * | 2014-02-18 | 2017-02-08 | 上海大学 | Method for reinforcing soft soil foundations by combining booster-type vacuum pre-compression and electro-osmosis |
| CN104264656B (en) * | 2014-09-26 | 2016-11-30 | 福建省建研工程顾问有限公司 | Vacuum preloading downward stabilization by drainage soft soil foundation method |
| CN104631427B (en) * | 2015-01-05 | 2017-05-24 | 温州大学 | Surface processing method of plastic drainage plate in deep pressurization system |
| CN104652412B (en) * | 2015-01-05 | 2017-07-04 | 温州大学 | A kind of method of the compound vacuum preloading soft soil foundation of deep layer |
| CN104631428B (en) * | 2015-01-05 | 2017-01-25 | 温州大学 | Partial deep layer pressurizing type vacuum preloading soft soil foundation processing method |
| CN104818707B (en) * | 2015-04-17 | 2017-03-01 | 盐城工学院 | Application cotton stalk consolidation and solidification dredging silt, the method for new barged-in fill |
| CN105649002A (en) * | 2015-12-29 | 2016-06-08 | 上海强劲地基工程股份有限公司 | Rapid treatment system and rapid treatment method for soft soil foundation |
| CN105603963A (en) * | 2016-02-29 | 2016-05-25 | 中交天津港湾工程研究院有限公司 | Flat belt lateral swelling combined vacuum pre-pressing foundation processing device and method |
| CN105735239B (en) * | 2016-03-21 | 2017-12-19 | 温州大学 | Three-dimensional supercharged vacuum precompressed processing method |
| CN106284277A (en) * | 2016-08-22 | 2017-01-04 | 南京新都地下工程研究院有限公司 | A kind of air sac pressing draining combined vacuum precompressed foundation reinforcement method |
| CN107806083B (en) * | 2017-09-22 | 2024-05-14 | 广州市盛洲地基基础工程有限公司 | Soft soil foundation reinforcement treatment water collection strong drainage device |
| CN108104104A (en) * | 2017-12-29 | 2018-06-01 | 浙江工业大学 | Method for reinforcing soft soil foundation through fluctuation pressurization type vacuum preloading |
| CN111549753B (en) * | 2020-04-30 | 2021-06-04 | 同济大学 | Vacuum preloading foundation treatment system and method combining transverse pressurization in hole |
| CN114197442B (en) * | 2021-11-29 | 2023-09-22 | 中交（天津）生态环保设计研究院有限公司 | Environment-friendly efficient dehydration drying method for dredging ultra-soft soil |
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| JP3785567B2 (en) * | 2001-03-13 | 2006-06-14 | 太平商工株式会社 | Consolidation promotion method for landfill soft viscous soil layer |
| CN101033609A (en) * | 2007-03-27 | 2007-09-12 | 天津大学 | Method of reinforcing soft soil foundation by gas extrusion drainage and used gasbag |
| CN101418566A (en) * | 2008-09-26 | 2009-04-29 | 宜兴市鑫泰土工材料有限公司 | Method for processing soft land base/tail slag/lake silt by supercharging preconsolidation at vacuum |
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2011
- 2011-01-13 CN CN2011100069094A patent/CN102116022B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3785567B2 (en) * | 2001-03-13 | 2006-06-14 | 太平商工株式会社 | Consolidation promotion method for landfill soft viscous soil layer |
| CN101033609A (en) * | 2007-03-27 | 2007-09-12 | 天津大学 | Method of reinforcing soft soil foundation by gas extrusion drainage and used gasbag |
| CN101418566A (en) * | 2008-09-26 | 2009-04-29 | 宜兴市鑫泰土工材料有限公司 | Method for processing soft land base/tail slag/lake silt by supercharging preconsolidation at vacuum |
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| CN102116022A (en) | 2011-07-06 |
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Owner name: HEIBEI SHENGGANG ENGINEERING SURVEY DESIGN CO., LT Free format text: FORMER OWNER: REDLAND (BEIJING) GEOTECHNICAL TECHNOLOGY CO., LTD. Effective date: 20130305 |
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Effective date of registration: 20130305 Address after: 061001 No. 6 Jiefang West Road, canal zone, Hebei, Cangzhou Patentee after: Hebei Sheng Hong Engineering Survey Design Co., Ltd. Address before: 100024, No. 308 West Zhuang village, Huai, Huairou District, Beijing, Beizhen Patentee before: China Hong Kong Foundation (Beijing) geotechnical Technology Co., Ltd. |
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