CN102220755B - Overpressure vacuum dewatering combined dynamic consolidation foundation treatment method - Google Patents
Overpressure vacuum dewatering combined dynamic consolidation foundation treatment method Download PDFInfo
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- CN102220755B CN102220755B CN201110094989A CN201110094989A CN102220755B CN 102220755 B CN102220755 B CN 102220755B CN 201110094989 A CN201110094989 A CN 201110094989A CN 201110094989 A CN201110094989 A CN 201110094989A CN 102220755 B CN102220755 B CN 102220755B
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Abstract
The invention provides an overpressure vacuum dewatering combined dynamic consolidation foundation treatment method, which comprises the following steps that: a pressurizing system is arranged, namely a certain number of micropore pressurizing tubes with a certain depth are arranged among longitudinal drainage well points, rubber sealing films are sleeved outside the pressurizing tubes, and high-pressure air is transmitted to the pressurizing tubes directly by an air compressor through a guide pipe; a vacuum dewatering system is arranged, namely a set of dewatering and drainage system provided with a vacuum pump for improving efficiency is arranged in a light-weight well point and tube well dewatering system additionally, wherein the air displacement of the vacuum pump is more than or equal to 100L/s, and the vacuum degree of the system is between 65 and 90kPa; and in a dynamic consolidation system, dynamic consolidation is performed by selecting pounders with different energy according to the dewatering conditions of strata, the moisture content of soil and permeability. Soft soil is pressurized laterally by the pressurizing system while the vacuum dewatering is performed, so that water molecules in soil bodies flow directionally to accelerate the consolidation of the soil bodies. By the method, the pressurization effect of vacuum combined loading of between 80 and 120kPa can be achieved, dewatering can be accelerated, the consolidation effect can be improved, and the construction process is quick, high-efficiency, energy-saving and environment-friendly.
Description
Technical field
The present invention relates to a kind of superpressure vacuum-dewatering associating forced ramming foundation treating method thereof, mainly be applicable to the higher silt of groundwater table, silty clay, sand foundation, more be applicable to the composite soil ground that is mixed with mud matter class soil in the sand, 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.Liaoning, Hebei, Shandong, Jiangsu, Fujian and Guangdong etc. are coastal all at reclaiming land around sea on a large scale.These areas are aleuritic texture soil mostly and are the mud matter class weak soil of high-moisture, high-compressibility.Through dredging aleuritic texture soil is made ground with the mixed hydraulically-filled large tracts of land of carrying out the rear of mucky soil, this hydraulic reclamation soil layer, groundwater table is high, water content is big, soil property is relatively poor.If without processing, be difficult to satisfy the requirement of engineering construction to land used.The geotechnical engineering problems relevant with barged-in fill is more and more outstanding, and key issue is the processing fast and effectively to barged-in fill.
The economic construction of China's high speed development is badly in need of wanting barged-in fill foundation treatment technologies quick, efficient, energy-saving and environmental protection; Blowing filling soft soil foundation mainly adopts vacuum method, vacuum combined stack-load, the vacuum combined job practicess such as water treatment, low position vacuum preloading, directly discharging type vacuum prepressing, superpressure vacuum-densified method of covering; In the reinforcing of soft (surpassing) subgrade is used, obtained success, and be widely used in the treatment of soft foundation engineering of Scale Sea Reclamation Project.
Silty clay and the sand higher for groundwater table mix the mucky soil ground, and the middle precipitation of mainly taking at present rams by force, the high-vacuum densification technical finesse.But along with increasing of mud matter content, particularly mud content surpass at 30% o'clock, effect and processing time that this method is handled have all received bigger restriction, if adopt displacement this moment, then duration and expense have all 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, the time of having accelerated vacuum-dewatering, improved the consolidation effect of composite soil, and realized quick, efficient, energy-conservation and environmental protection to the hydraulic reclamation treatment of soft foundation.
Summary of the invention
The present invention relates to a kind of superpressure vacuum-dewatering associating forced ramming foundation treating method thereof, this method has been quickened the directed flow of hydrone in the soil body, the time of having accelerated vacuum-dewatering.
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: the ground that needs are handled carries out simple and easy smooth; If the longitudinal drainage well point connects to gutter each draining well point employing level; Pressurization system is set; Utilize air compressor machine supercharging in pressurization system; Utilize vacuum pump to get rid of the water in the pipe of well point; Show that at ground the strong energy of ramming that rams of utilization carries out dynamic consolidation.Pressurization system is between the longitudinal drainage well point, to arrange the pressure inlet of some, certain depth, and the pressure inlet sidewall is porose, wall overcoat rubber sealing film.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.
The longitudinal drainage well point is light well point or pipe well well point, connects a cover vacuum pump and improves precipitation efficiency, and the vacuum pump capacity is not less than
100L/s, vacuum does
65～90kPa
Suction pump can also be installed in pipe well; And make its water sucking mouth be higher than the water inlet of pipe well, pressure bladder with a well seal cover, is established in well lid week in the pipe well top; At floor mounted one vacuum pump; On well lid, install the vacuum tube of a connection vacuum pump suction gas port and pipe well inner chamber additional, utilize vacuum pump that pipe well is bled then, make to present vacuum negative pressure condition in the pipe well.
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 use the transverse drainage plate and 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:Superpressure vacuum organigram.
Fig. 2:The vacuum tube well organigram.
Among the figure: 1, vacuum extractor, 2, high-pressure pump, 3, the pipe well linkage; 4, pressure inlet and rubber membrane, 5, vacuum well point (pipe well) precipitation device, 6, groundwater table; 7, unidirectional gas valve, 8, the sealing valve, 9, sealed well lid; 10, air duct, 11, drainage pipe, 12, for water pump.
The specific embodiment
, pressurization system arranges
Pressurization system is provided with.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 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.
, vacuum well-point dewatering arranges
According to the construction characteristic of vacuum well-point dewatering, technological controlling parameter, technological process main points should be passed through field trial before large-area construction, adjust inappropriate design parameters, confirm best construction technology.Should confirm following parameters after the type testing:
1. the spacing of vacuum tube and the degree of depth;
2. vacuum-dewatering and rammer pass by force;
3. every time vacuum-dewatering time, single-rammer energy and ramming volume are controlled index;
4. grid spacing and rammer are all over the intermittent time;
5. effective reinforcement depth;
6. ground is handled the physical mechanical property index comparative analysis of forward and backward each soil layer.
Crosscheck mesh before vacuum tube is arranged and whether meet technical requirements, and with giant towards Xian, whether observe current unimpeded.Filter screen must be changed if any breakage.The insertion of vacuum tube answers the holding position correct, vertically assigns.To conscientiously clean behind the tube drawing, remove the obstruction of intubate the inside, in time change filter screen, guarantee that the dialysis performance of intubate is good.
Carry out vacuum pump, the maintenance of suction pump, tracked machine, road roller and maintenance guarantee that conscientiously performance reaches optimum state in the unit operation.
、
Vacuum tube well hole diameter 300mm, lower end 3～4m are bag net floral tube with holes, and well head exceeds the face of land 0.3～0.5m, and with drilling into well, the outer thick medium coarse sand of backfill 5～10cm of well casing adopts 1～2 inch submersible pump to draw water.The pipe well mouth should adopt sealed well lid, adopts vacuum plant to carry out vacuumizing in the pipe well, makes pipe well reach 65～90kPa negative pressure of vacuum effect.
, dynamic consolidation construction
The hammering number and the settling amount of conscientious each strong tamping point of detection record guarantee that leak source does not much hit.By the construction technology of dynamic compaction, working specification is carried out.Construction period should measure groundwater table, after actual groundwater table satisfies the requirement of design precipitation, just can begin strong rammer.
Strong hammer ram is answered held stationary, and the square frame center should be aimed at by strong hammer ram bottom center, guarantee tamping point accurately, the position, hole that does not allow to misplace with hammering tilts.Guarantee every strong rammer energy, the amount of bombarding and sink that surveying record whenever hits and each strong tamping point hit number.Abnormal conditions such as appearance amount of bombarding and sink or tamping pit side direction protuberance are excessive should in time be analyzed reason and handle.
Point rams stopping criterion: beat the number that hits of foot suggestion when single-point adds up the amount of bombarding and sink less than controlling depth, strong crater depth stops strong rammer when surpassing controlling depth, when blow ramming volume is obviously greater than a preceding blow behind the identical energy, stops strong rammer.
Control every all over the intermittent time of ramming, pushing away the equality inter process by force.Should be again to point in the construction as inclined to one side hammer takes place.Ram in the process by force as the askew hammer of appearance, could continue construction after should leveling up.The ponding of in strong process of ramming, in time getting rid of strong tamping pit and place.
Whenever hit ramming volume through measuring the change calculations of peen face height.Need continue to keep precipitation in the process of dynamic consolidation construction, every all over after rammer finishes to treat pore pressure dissipation 70～80% by force, the place is pushed away flat by bulldozer.Next is arranged with last all over tamping point and becomes blossom type to arrange all over tamping point.
Claims (5)
1. a superpressure vacuum-dewatering associating forced ramming foundation treating method thereof is characterized in that may further comprise the steps: the ground that needs are handled carries out simple and easy smooth; If the longitudinal drainage well point connects to gutter each draining well point employing level; Pressurization system is set, and pressurization system is between the longitudinal drainage well point, to arrange the pressure inlet of some, certain depth, and the pressure inlet sidewall is porose, wall overcoat rubber sealing film; Utilize air compressor machine supercharging in pressurization system; Utilize vacuum pump to get rid of the water in the pipe of well point; Carry out dynamic consolidation at the strong energy of ramming that rams of foundation surface utilization.
2. the method for claim 1 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.
3. the method for claim 1 is characterized in that, the longitudinal drainage well point is light well point or pipe well well point, connects a cover vacuum pump and improves precipitation efficiency, and the vacuum pump capacity is not less than
100L/s, vacuum does
65～90kPa
4. method as claimed in claim 3 is characterized in that, suction pump is installed in pipe well; And make its water sucking mouth be higher than the water inlet of pipe well, pressure bladder with a well seal cover, is established in well lid week in the pipe well top; At floor mounted one vacuum pump; On well lid, install the vacuum tube of a connection vacuum pump suction gas port and pipe well inner chamber additional, utilize vacuum pump that pipe well is bled then, make to present vacuum negative pressure condition in the pipe well.
5. the method for claim 1 is characterized in that, rams the dynamic consolidation system by force, according to stratum precipitation event, soil property water content and permeability, selects for use the different-energy hammer ram to carry out dynamic consolidation earlier.
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| CN201110094989A CN102220755B (en) | 2011-04-15 | 2011-04-15 | Overpressure vacuum dewatering combined dynamic consolidation foundation treatment method |
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| CN201110094989A CN102220755B (en) | 2011-04-15 | 2011-04-15 | Overpressure vacuum dewatering combined dynamic consolidation foundation treatment method |
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| CN102220755B true CN102220755B (en) | 2012-08-29 |
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|---|---|---|---|---|
| CN102587348B (en) * | 2012-03-22 | 2015-02-25 | 上海市城市建设设计研究总院 | Pressurizing and dewatering rod device |
| CN102767174A (en) * | 2012-07-17 | 2012-11-07 | 沈卫清 | Dynamic and static water-discharging vibration method |
| CN102953369A (en) * | 2012-09-07 | 2013-03-06 | 谷孝建 | Soft soil foundation treatment method |
| 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 |
| 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 |
| CN104929102A (en) * | 2015-04-23 | 2015-09-23 | 上海交通大学 | Silt rheology vacuum vibration combined dewatering system and method |
| CN105178283A (en) * | 2015-08-21 | 2015-12-23 | 四川九鼎智远知识产权运营有限公司 | Dynamic consolidation and drainage construction method for mucky soil |
| 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 |
| CN105926579B (en) * | 2016-06-29 | 2017-11-14 | 武汉南方旭域科技工程有限公司 | A kind of adding pressure type sleeve pipe impact drain consolidation system and method |
| CN106049413B (en) * | 2016-08-02 | 2018-03-30 | 唐山工业职业技术学院 | A kind of composite power drain consolidation system and construction method applied to deep layer foundation in saturated soft soil |
| CN106869108A (en) * | 2017-03-28 | 2017-06-20 | 广州市万厚投资有限公司 | A kind of reinforced soft soil ground processes vacuum low-level prepressing device |
| CN107034873B (en) * | 2017-06-08 | 2019-02-12 | 南京工业大学 | The method for processing foundation of the multidirectional precompressed of combined vacuum is squeezed in a kind of side |
| CN108411890A (en) * | 2018-02-09 | 2018-08-17 | 上海港湾基础建设（集团）股份有限公司 | A kind of improved subgrade static(al) draining concretion method |
| CN112921949B (en) * | 2021-01-18 | 2022-06-10 | 江苏鑫泰岩土科技有限公司 | Ultra-low water level dynamic compaction system and method |
| CN113605361A (en) * | 2021-08-21 | 2021-11-05 | 中铁一局集团(广州)建设工程有限公司 | High-vacuum compaction deep silt foundation reinforcing structure and construction method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664245A (en) * | 2005-04-01 | 2005-09-07 | 东南大学 | Operation method for consolidating soft soil foundation by pneumatic flerry vacuum preloading method |
| KR20100059205A (en) * | 2008-11-26 | 2010-06-04 | (주)지구환경전문가그룹 | Construction method using suction sand bag |
-
2011
- 2011-04-15 CN CN201110094989A patent/CN102220755B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664245A (en) * | 2005-04-01 | 2005-09-07 | 东南大学 | Operation method for consolidating soft soil foundation by pneumatic flerry vacuum preloading method |
| KR20100059205A (en) * | 2008-11-26 | 2010-06-04 | (주)지구환경전문가그룹 | Construction method using suction sand bag |
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