CN1127595C - 'High-vacuum compacting method' for quickly treaitng soft foundation - Google Patents
'High-vacuum compacting method' for quickly treaitng soft foundation Download PDFInfo
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- CN1127595C CN1127595C CN 01127046 CN01127046A CN1127595C CN 1127595 C CN1127595 C CN 1127595C CN 01127046 CN01127046 CN 01127046 CN 01127046 A CN01127046 A CN 01127046A CN 1127595 C CN1127595 C CN 1127595C
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000002689 soil Substances 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000013632 homeostatic process Effects 0.000 claims abstract description 8
- 238000005056 compaction Methods 0.000 claims description 6
- 238000000280 densification Methods 0.000 claims description 6
- 238000007667 floating Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 16
- 238000009490 roller compaction Methods 0.000 abstract 2
- 239000004576 sand Substances 0.000 description 13
- 239000000843 powder Substances 0.000 description 10
- 239000004927 clay Substances 0.000 description 7
- 238000012545 processing Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000013019 agitation Methods 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 210000000476 body water Anatomy 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
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- 239000007924 injection Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
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- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The present invention relates to a soft foundation treating method, particularly to a rapid high-vacuum compacting method. The method is characterized in that a high-vacuum well point dewatering method and a vibratory roller compaction method or a heavy tamping method are used to reduce the water content of treated soil body to increase the consistency of the soil body. The high-vacuum well point dewatering method is characterized in that a plurality of rows of vacuum pipes are inserted into soft foundations needing to be treated; a vacuum pump and an automatic homeostasis cylinder are additionally arranged on the basis of well point equipment; the automatic homeostasis cylinder is respectively connected with the vacuum pump, a total water collecting pipe of the well point equipment and a drain pump; the soft soil foundation is pumped to contain certain water content in a vacuum mode. The vibratory roller compaction method or the heavy tamping method is characterized in that when the water content of soil bodies needing to be treated reaches a value, impact and vibration equipment tamps the soil bodies needing to be treated to certain consistency. The present invention has short construction period, low construction cost and high bearing capacity after treatment.
Description
Technical field:
The present invention relates to a kind of large tracts of land subgrade method for processing foundation.
Background technology:
Large tracts of land subgrade ground is handled, and common method has three kinds: first kind is the pile foundation method: routine powder spray piling, agitation pile, pile foundations such as lime pile, vibrosinking pile.This processing method construction cost height, construction period are long; Second kind is consolidation: platen press is given in skewer plastic plate+vacuum or preloading.This processing method construction cost height, the construction period is long, handles lower (the general 8T/m of back supporting capacity
2About); The third is a dynamic compaction.Dynamic compaction need be dispatched by main equipment, the measure such as insert of coarse aggregate, and construction cost is bigger.
Summary of the invention:
The object of the present invention is to provide a kind of construction period weak point, lower, the higher novel flexible foundation treatment method of processing back supporting capacity of construction cost.
The object of the present invention is achieved like this: a kind of Fast "High Vacuum Densification Method" Soft Ground Treatment Method is to adopt the high vacuum well-points dewatering to add the water content that vibroroller cmpacting or dynamic compaction method reduce the processed soil body, to improve the compactness of the soil body.
Above-mentioned high vacuum well-points dewatering is promptly adopted: skewer is gone into several vacuum pumping pipes on the need soft soil foundation treatment, each vacuum tube connects the total header of well point equipment, equipment total header in well point connects a homeostasis tube, and the homeostasis tube links to each other with drainage pump with vacuum pump respectively, and vacuum is drawn water; The drainage pump dynamic equilibrium synchronous working of vacuum pump and well point equipment reaches the water content that high power reduces the soil body fast, and making needs to handle the optimum moisture content that the soil body reaches best compactness; Vibroroller cmpacting or strong the rammer are promptly adopted: need handle the soil body through vacuum draw water reach certain water content in, adopt and hit the equipment of shaking and hit the real soil body that needs to handle and reach best compactness.
Compare with existing processing method, characteristics such as the present invention handles large tracts of land subgrade ground to be had fast, cheapness: process cycle 5-7 days, a construction in month reaches hundreds thousand of squares, can satisfy the unconventional requirement of key project duration, reduces to only more than 10 yuan for every square metre nearly 200 yuan by agitation pile.Adopt this method subgrade through behind 7 days construction periods, bearing capacity of foundation soil is from 6T/m
2Bring up to 18T/m
2N
63.5The mark injection is 16～18m; N10＞50 are hit; The ground modulus of resilience＞60MPa, the average penetration resistance of preceding 0～2m of constructing is 1.39MPa, and 2～3m is 1.69MPa, and after the construction, the average specific penetration resistance of 0～2m is increased to 7.03MPa, and 2～3m is 4.28MPa.The construction achievement of obvious this technology is tangible.
Description of drawings:
Fig. 1 is surge drum of the present invention and vacuum pump, well point equipment, drainage pump connection diagram.
The specific embodiment:
Below the present invention is described in further detail:
The present invention is a kind of Fast "High Vacuum Densification Method" Soft Ground Treatment Method, adopt the high vacuum well-points dewatering to add the water content that vibroroller cmpacting or dynamic compaction method reduce the processed soil body, making needs to handle the compactness (the different soil bodys, different optimum moisture contents, different best compactness) that the soil body reaches optimum moisture content.
Design principle of the present invention is six big key elements: the one, and the water content of the processed soil body of employing high vacuum forcibly changing, making needs to handle the optimum moisture content that the soil body reaches best compactness.The 2nd, when need are handled the soil body and reached optimum moisture content, adopts and special large-scalely hit real equipment and hit the real soil body that needs to handle and reach best compactness.The 3rd, according to the natural frequency of the need processing soil body, adjust and hit vibration frequency (less than soil body frequency 10～15%), make the closely knit resonance of the processed soil body strengthen the closely knit degree of depth.The 4th, the correct super interstitial hydraulic pressure extinction time of the processed soil body that calculates, per pass hit the soil body that shakes preliminary fixed recovery time, are strictly on guard against the formation of " spring soil ".The 5th, according to transmission coefficient, the water content of the different soil bodys, correct optimal vacuum pressure, vacuum tolerance, the balance parameters of forcing to adjust water content that calculate.The 6th, according to the degree of depth of the need processing soil body, the correct needed power of shaking of hitting of close soil body stress diffusion of hitting of calculating.
The high vacuum well-points dewatering is promptly adopted: skewer is put several vacuum pumping pipes (the different soil bodys, different array pitch, spacing, the degree of depth) in the need soft soil foundation treatment, and each vacuum tube connects the total header of well point equipment; On former light well point Equipment Foundations, add and put a high-power vacuum pump (design parameters is 750mmHg, 50 liters/second of vacuum tolerance) and a homeostasis tube.Surge drum is the cylinder of a diameter 700, high 1.2m.The tube crown center is opened an aspirating hole, links to each other with vacuum pump by tube connector, and the stack shell both sides are the symmetrical connector of opening two 63mm far from end 200mm place, and one connects the total header of light well point equipment, a High Pressure Drain pump (displacement 50/m who connects BY3
3Hour), at the axis of guide of the electric welding of inner bottom part center 15mm, a high 60cm of tube, the motion that 500mm, a high 800mm (there is 30mm through-core hole at the center) be installed on the axle floating drum of living.This floating drum utilizes buoyancy function to regulate vacuum pump and the mutual dynamic fit work of High Pressure Drain pump.Take out light well point water storage capability when too big when vacuum pump, water level raises in the surge drum, and under the effect of the float buoyancy of living, the floating drum of living rises, and vacuum pump top aspirating hole is closed, and vacuum pump stops worker's usefulness, and high-pressure pump BY3 accelerates draining; When water level was reduced to certain water level in the surge drum, the floating drum of living fell voluntarily, and vacuum pump works on, and so just constantly circulation makes the continuous dynamic equilibrium work in high-pressure pump gap of vacuum pump and well point equipment.Reach the water content of the high power rapid adjustment soil body like this.The connected mode of surge drum and light well point, vacuum pump, high-pressure hydraulic pump such as Fig. 1.
Vibroroller cmpacting or strong rammer the: when need are handled the soil body and reached optimum moisture content, adopts the large-scale equipment of shaking that hits to hit the real soil body of processing that needs and reach best compactness.
Concrete application example is exemplified below:
Example 1: the somewhere geological condition is: the top layer is the powder fine sand of hydraulic reclamation then, and particle directly accounts for 85% for the content of 0.075mm, and containing mud is 5～10%, about the thick 2～2.5m of hydraulic fill sand, handles preceding water content more than 50%, is in liquefaction, the about 4T/M of bearing capacity
2(people walk about difficulty).(2～2.5m) is former looser farmland (clay), and bearing capacity is about 8T/m under the hydraulic fill sand
2According to the Container Yard designing requirement, surface load is 15T/m
2, and require the top layer to handle the crust layer that homogeneous thickness of formation surpasses 3.5m through ground.According to tabling look-up, the transmission coefficient of this powder fine sand is 10
-4Cm/s, the optimum moisture content of best compactness is 10～11%, according to the crust layer more than the designing requirement formation 3.5m, arrange the 3.5m vacuum tube for this reason, precipitation slope according to this powder fine sand dropdown curve is about 15～20 °, the array pitch of vacuum tube should be 5～6m as calculated, but in actual the use, in order to accelerate the duration, the actual arrangement array pitch is 12～13m, the water content of middle 5～6m is controlled at vacuum tube work and utilizes road roller to squeeze interstitial water at middle 5～6m static pressure after 36 hours to flow to two limit vacuum tubes, and plays the purpose of control water content.
Hitting shakes adopts deadweight 22.7T, hit the power 450KN that shakes, frequency at the adjustable vibratory roller of 0～30HZ (according to the about 25HZ of the best closely knit frequency of this powder fine sand soil body, theoretical when road roller hits vibration frequency less than soil body frequency 10～15% according to compacting, when hitting the power of shaking when being 450KN, the darkest degree of depth that influences of test the best is 3.5m, this moment, the compactness at 3.5m place surpassed more than 90% the super 12T/m of bearing capacity
2More than).
Concrete construction technology is as follows:
1, water jetting is arranged vacuum tube, and array pitch 12～13m, pipe be apart from 2m, buried depth 3.5m, and (not irritating sand) connects the total header of well point equipment (the about 150m of pipe range).
2, connect vacuum pump, surge drum, high-pressure hydraulic pump, the total header of well point equipment.
3, adjust vacuum (greater than 500mmHg).Adjusting rate of air sucked in required＞40～45 liter/second gets final product.Vacuum was drawn water 36 hours, and the road roller of employing＞12T makes interstitial water to vacuum tube chain agent water middle 5～6m place static pressure one time.
4, vacuum was drawn water 72 hours, adopted special 22.7T road roller, and frequency is transferred at 10～15HZ, and speed of travel second gear (5 kilometers/hour) hits repeatedly back and forth and shakes one time.
5, disappeared 80% or more about 24 hours according to the super interstitial hydraulic pressure of powder fine sand, and preliminary fixed about 24 hours of this soil body, hitting shakes for this reason at every turn rolled the interval 24 hours, and the same hitting of reciprocating frequence speed shaken two times back and forth.
6, analyze powder fine sand optimum moisture content (as water content＞12%, continue vacuum-dewatering,, adopt the evenly artificial water-sprinkling in top layer) as water content＜10%.When water content is 10～11%, adopt the adjustment soil body to hit the about 22HZ of vibration frequency (less than soil body frequency 10～15%), third gear walking (2.5 kilometers/hour) is hit the power of shaking and is transferred to 450KN, by being off time 24 hours modes, fights back shake three times (3 days).
7, treat last all over after finishing 7 days, adopting that load plate, mark pass through etc. carries out detections such as bearing capacity, compactness, and bearing capacity reaches 18T/m
2(super design 15T/m
2Requirement).
Owing to adopt " High vacuum compacting method " per 400,000 m
2The ground treatment construction phase all in 2 months, has been satisfied tight requirement of duration of a project, and reduced price is also lower, only more than 10 yuan/m
2
Example 2: somewhere (380,000 m
2) blast is thick is 2～2.3m (particle diameter 0.075mm accounts for 85%, water content about 50%), the peasant is in order to breed fish at that time, carries out disturbance with dredge pump former with eliminating, and (this layer depth is all greater than 6m, and bearing capacity is 4～6T/m only to make the noisy following mud matter of the 2～2.3m silty clay of hydraulic reclamation
2, water content 60%), according to designing requirement, after ground was handled, top layer 0～2m design bearing capacity was 15T/m
2, 2～4m bearing capacity is greater than 12T/m
2Propose to adopt " High vacuum compacting method " to carry out ground handles for this reason.Because top layer 0～2m, 2～4m are the different soil property of the two classes (transmission coefficient of the soil body: powder fine sand 10
-4Cm/s, mud matter silty clay 10
-6M/s, the super interstitial hydraulic pressure extinction time of soil body difference: about 20 hours of powder fine sand disappears more than 85%, about 72 hours of mud matter silty clay; The optimum moisture content difference of the best compactness of the soil body: the powder fine sand is 10%, and mud matter silty clay is 26%, preliminary fixed asynchronism(-nization) behind the soil disturbance, the powder fine sand is about 1 day, about 7 days of mud matter silty clay).For this reason, according to the two-layer different soil body, two keys (optimum moisture content control, the control of best compactness) of catching bearing capacity to improve, wherein the most difficult is the control of optimum moisture content, for this reason, according to two layers of different soil body, adopt the layering facture to carry out ground and handle, hit the close soil body, consider that 2～4m is a mud matter silty clay, form " spring soil " in order to prevent the road roller vibration, hit the real dynamic compaction that adopts, concrete construction technology is as follows:
1, the 2.5m vacuum tube is inserted in surperficial 2m water content control, and array pitch 10m pipe is apart from 4m, and vacuum 700mmHg vacuumized 48 hours, pulled out vacuum tube.
2, first pass rams by force immediately, energy 800KN (ramming heavy 12T, diameter 2.5m), and 3.5 * 4m is arranged in the position, hole, every some blow, bulldozer pushes away position, flat hole, 2～3 days time, allows super interstitial hydraulic pressure disappear substantially.
3,2～3m water content control, cloth 5m vacuum tube, spacing 3.5m blossom type arranges that vacuum 750mmHg vacuumizes (water content surpasses 26%, proper extension).
4, satisfying first pass and second time interval seven days, when 2～4m soil body water content reaches optimum moisture content, when pulling out vacuum tube, second time strong rammer immediately, energy 1350KN, position, hole a 3.5 * 4m (staggering) with first pass, every two is hit.
Above processing method after testing, ground after treatment, surperficial 2m reaches 15T/m
2, 2～4m reaches 12T/m
2Designing requirement.380,000 squares of large tracts of land are used and should " High vacuum compacting method " be constructed for this reason.
Claims (3)
1, a kind of Fast "High Vacuum Densification Method" Soft Ground Treatment Method is characterized in that adopting the high vacuum well-points dewatering to add the water content that vibroroller cmpacting or dynamic compaction method reduce the processed soil body, to improve the compactness of the soil body.
2, a kind of Fast "High Vacuum Densification Method" Soft Ground Treatment Method according to claim 1, it is characterized in that the high vacuum well-points dewatering promptly adopts: skewer is gone into several vacuum pumping pipes on the need soft soil foundation treatment, each vacuum tube connects the total header of well point equipment, equipment total header in well point connects a homeostasis tube, the homeostasis tube links to each other with drainage pump with vacuum pump respectively, and vacuum is drawn water; Vibroroller cmpacting or strong the rammer are promptly adopted: when need are handled the soil body and reached certain water content, adopt and hit the equipment of shaking and hit the real soil body that needs to handle and reach certain compactness.
3, a kind of Fast "High Vacuum Densification Method" Soft Ground Treatment Method according to claim 2, it is characterized in that homeostasis tube cylinder top center offers an aspirating hole, link to each other with vacuum pump, the cylindrical shell both sides are set up an aspirating hole separately, connect total header of well point equipment and drainage pump respectively, cylindrical shell inner bottom surface center fixture one axis of guide is nested with a floating drum alive on the axis of guide.
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|---|---|---|---|
| CN 01127046 CN1127595C (en) | 2001-07-28 | 2001-07-28 | 'High-vacuum compacting method' for quickly treaitng soft foundation |
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| CN 01127046 CN1127595C (en) | 2001-07-28 | 2001-07-28 | 'High-vacuum compacting method' for quickly treaitng soft foundation |
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| CN1330189A CN1330189A (en) | 2002-01-09 |
| CN1127595C true CN1127595C (en) | 2003-11-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293263C (en) * | 2004-11-25 | 2007-01-03 | 徐士龙 | Method of soft ground treatment using high vacuum variable energy cross tampering |
| CN100375819C (en) * | 2005-12-30 | 2008-03-19 | 叶吉 | Method for treating soft foundation by double control power consolidation |
| CN100392194C (en) * | 2005-10-09 | 2008-06-04 | 南京工业大学 | Forced draining mixed mode dynamic consolidation method |
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|---|---|---|---|---|
| CN100359100C (en) * | 2005-12-29 | 2008-01-02 | 徐士龙 | Method for treating soft foundition by fast 'high vacuum impacting dense, pile base' compound method |
| CN100422447C (en) * | 2006-03-03 | 2008-10-01 | 中交第四航务工程局有限公司 | Technique for quickly reinforcing soft soil foundation |
| CN100582377C (en) | 2006-12-01 | 2010-01-20 | 上海港湾软地基处理工程有限公司 | Method for treating soft foundation by fast 'informationized high vacuum densification' |
| CN100532729C (en) * | 2007-06-28 | 2009-08-26 | 刘汉龙 | High vacuum well-points dewatering groundwork treatment method by shallow ramming compaction and deep blasting compaction |
| CN102116019A (en) * | 2009-12-31 | 2011-07-06 | 上海港湾软地基处理工程(集团)有限公司 | Method for rapidly treating soft foundation through high vacuum densification |
| CN102691290B (en) * | 2012-06-15 | 2014-07-09 | 河海大学 | Anti-silting drainage body device and method thereof |
| CN103122631A (en) * | 2013-02-01 | 2013-05-29 | 叶吉 | Soft soil foundation preloading stamping reinforcement method |
| CN104790373B (en) * | 2015-05-06 | 2017-07-28 | 中化岩土集团股份有限公司 | The closely knit method of immersed tube exciting |
| CN106192981B (en) * | 2016-07-08 | 2018-04-03 | 河海大学 | A kind of Dewatering dynamic compaction integrated device and its application method |
| CN108978629A (en) * | 2018-08-21 | 2018-12-11 | 中铁第五勘察设计院集团有限公司 | A kind of sand pile joint High vacuum compacting method treatment of soft foundation structure |
| CN108978625A (en) * | 2018-08-21 | 2018-12-11 | 中铁第五勘察设计院集团有限公司 | A kind of sand pile joint High vacuum compacting method construction of soft soil treatment engineering method |
-
2001
- 2001-07-28 CN CN 01127046 patent/CN1127595C/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293263C (en) * | 2004-11-25 | 2007-01-03 | 徐士龙 | Method of soft ground treatment using high vacuum variable energy cross tampering |
| CN100392194C (en) * | 2005-10-09 | 2008-06-04 | 南京工业大学 | Forced draining mixed mode dynamic consolidation method |
| CN100375819C (en) * | 2005-12-30 | 2008-03-19 | 叶吉 | Method for treating soft foundation by double control power consolidation |
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| Publication number | Publication date |
|---|---|
| CN1330189A (en) | 2002-01-09 |
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Assignee: Shanghai Gangwan Soft Foundation Treatment Engineering Co., Ltd. Assignor: Xu Shilong Contract fulfillment period: 2008.6.30 to 2013.6.30 Contract record no.: 2008310000024 Denomination of invention: 'High-vacuum compacting method' for quickly treaitng soft foundation Granted publication date: 20031112 License type: Exclusive license Record date: 20080909 |
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Free format text: EXCLUSIVE LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.6.30 TO 2013.6.30 Name of requester: SHANGHAI GANGWAN SOFT BASE TREATMENT ENGINEERING Effective date: 20080909 |
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Effective date of registration: 20170621 Address after: 201507, Shanghai, Jinshan District Town, East China Sea, eight groups Patentee after: Shanghai harbor infrastructure (Group) Co., Ltd. Address before: 214400 No. 106, building 4, Chengjiang village, Jiangsu, Jiangyin Patentee before: Xu Wang |
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| CP03 | Change of name, title or address | ||
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Address after: 201507 Shanghai Jinshan District, Caojing Town, Ting Wei Road, 3316, 1, two, 207 rooms. Patentee after: Shanghai Bay infrastructure construction (Group) Limited by Share Ltd Address before: 201507 eight Caojing Town, Jinshan District, Shanghai Patentee before: Shanghai harbor infrastructure (Group) Co., Ltd. |
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