CN1420239A - Method for reinforcing soft foundation by vacuum drainage and prepressing - Google Patents
Method for reinforcing soft foundation by vacuum drainage and prepressing Download PDFInfo
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- CN1420239A CN1420239A CN 02135018 CN02135018A CN1420239A CN 1420239 A CN1420239 A CN 1420239A CN 02135018 CN02135018 CN 02135018 CN 02135018 A CN02135018 A CN 02135018A CN 1420239 A CN1420239 A CN 1420239A
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- soft foundation
- vacuum
- prepressing
- water discharging
- discharging body
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A method for reinforcing the soft foundation by vacuum drainage and prepressing includes excavating the sealed ditch along the boundary of the soft foundation to be reinforced, spreading a sand layer, driving the water-draining bodies as vertical drainage channel into the foundation at intervals, burying the pipeline connected to vacuumizing equipment in said sand layer, and spreading an air-permeable film. Its advantages are simple structure, low cost and high effect.
Description
Belong to technical field
The present invention relates to a kind of method of reinforcing soft foundation by vacuum drainage and prepressing.
Background technology
At present, vacuum preloading is widely used in reinforcing soft soil (mud, mucky soil, weak clay) ground, it is stable that vacuum can reach the above also maintenance of 75kPa under the vacuum diaphragm, vacuum is very dark to the transmission of ground depths by the water discharging body (sand wick or plastic draining board) that is arranged in the ground, and vacuum depends primarily on well resistance size along depth attenuation's speed.
When the ground internal memory in continuity preferably during pervious layer (layer of sand, layer of gravel), particularly pervious layer is when water body is communicated with on every side, under vacuum action, extract a large amount of underground water (gas) out from pervious layer, consume a large amount of vacuum energies, the weak soil layer that vacuum is difficult to below pervious layer effectively transmits, the vacuum preloading failure.
In order to reduce the harm of pervious layer to vacuum preloading, usually verify the spatial distribution scope of ground inner water penetrating layer earlier, utilize deep-mixed pile, steel sheet pile, grouting around in the place that has pervious layer, the sealing that the method for moulding etc. is carried out the soil layer deep is inserted in high-pressure rotary spraying method or grooving, purpose is to form waterproof of man to cut off vacuum preloading zone and the contact of underground water (gas) on every side, reduces the harm of pervious layer to vacuum preloading.Above-mentioned the whole bag of tricks cost height, the engineering time is long, thereby has seriously limited the range of application of vacuum preloading.
Summary of the invention
The object of the present invention is to provide a kind of simple in structurely, it is convenient to implement, and cost is low, and can reduce the method for pervious layer to the reinforcing soft foundation by vacuum drainage and prepressing of vacuum preloading harm effectively.
For achieving the above object, the method of a kind of reinforcing soft foundation by vacuum drainage and prepressing of the present invention, on the periphery of the soft foundation that desire is reinforced, offer the sealing ditch earlier, and on this ground, lay certain thickness sand cushion, on this ground, squeeze into water discharging body then at a certain distance as vertical drain, again air-locked film is laid on sand cushion and the sealing ditch, the output of this water discharging body is in sand cushion, in sand cushion, also be embedded with simultaneously the pipeline with holes that is connected with vacuum extractor, squeeze in pervious layer one section of water discharging body in the ground and be arranged with sealing shroud, the sealing cover extends in the pervious layer weak soil layer up and down.The sealing shroud that is enclosed within on the water discharging body extends to 1-2 rice in the weak soil layer.The present invention compares with original technology has following characteristics.
1. original technology is by being provided with the hydraulic connection of waterproof of man cut-out and pervious layer around the whole place that reinforces in desire; The present invention directly installs sealing shroud on water discharging body, cut off the hydraulic connection with pervious layer.
2. original Technology Need is construction drainage body and waterproof of man respectively, needs to increase in addition construction machinery, and the construction period is longer, and sealing shroud can be provided with water discharging body among the present invention, does not need to increase other construction machineries, does not increase the duration substantially.
3. the waterproof of man cost in original technology is higher, for the highway soft foundation of reinforcing the about 60m of width, if permeable bed thickness 3m, bottom surface buried depth 9.5m, along the about 1600-2000 unit/m of the cost of highway direction waterproof of man, and the about 540 yuan/m of the cost of sealing shroud among the present invention is about 30% of original cost.
4. the water in the permeable body (gas) must be found time in original technology back and cause could be with the weak soil layer transmission of vacuum under pervious layer after certain vacuum, need like this to consume than macro-energy and certain hour, the present invention directly carries vacuum in the weak soil layer of permeable body lower floor by sealing shroud vertical row water body, need not consume above-mentioned energy, accelerate the duration simultaneously.
Description of drawings
Fig. 1 is the structural representation of the concrete a kind of embodiment of the present invention;
Fig. 2 is the structural representation of another embodiment of the present invention.
Specific embodiments
As Fig. 1, shown in 2, the method of a kind of reinforcing soft foundation by vacuum drainage and prepressing of the present invention, on the periphery of the soft foundation that desire is reinforced, offer sealing ditch 5 earlier, and on this ground, lay certain thickness sand cushion 9, on this ground, squeeze into water discharging body 1 then at a certain distance as vertical drain, again air-locked film is laid on the sand cushion 9, imbed in the sealing ditch 5, the output of this water discharging body 1 is in sand cushion 9, in sand cushion 9, also be embedded with the pipeline 10 that is connected with vacuum extractor 4, determine the spatial distribution scope of pervious layer 7 according to prospecting, determined to install the length and the installation site of sealing shroud 2 thus.Sealing shroud 2 is installed on water discharging body 1 then, and with water discharging body 1 fixing (colligation or bonding), sealing shroud 2 stretches into the length L of the weak soil layer 6 of pervious layer 7 upper and lowers should be in the 1-2m scope.As shown in Figure 2, when pervious layer 7 tops did not have weak soil layer 6, pervious layer 7 tops, vacuum preloading district were provided with the thick artificial weak soil floor 8 of one deck 1-2m.Artificial weak soil layer 8 is provided with before water discharging body 1 construction.
Claims (2)
1, a kind of method of reinforcing soft foundation by vacuum drainage and prepressing, on the periphery of the soft foundation that desire is reinforced, offer sealing ditch (5) earlier, and on this ground, lay certain thickness sand cushion (9), on this ground, squeeze into water discharging body (1) then at a certain distance as vertical drain, again air-locked film is laid on sand cushion (9) and the sealing ditch (5), the output of this water discharging body (1) is in sand cushion (9), in sand cushion (9), also be embedded with the pipeline (10) that is connected with vacuum extractor (4), it is characterized in that: the water discharging body of squeezing in the ground (1) is with sealing shroud (2) at pervious layer (7) section place, and sealing cover (2) extends in pervious layer (7) the weak soil layer (6) up and down.
2, the method for a kind of reinforcing soft foundation by vacuum drainage and prepressing according to claim 1 is characterized in that: the sealing shroud (2) that is enclosed within on the water discharging body (1) extends to the interior 1-2 rice of weak soil layer (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02135018 CN1420239A (en) | 2002-10-24 | 2002-10-24 | Method for reinforcing soft foundation by vacuum drainage and prepressing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02135018 CN1420239A (en) | 2002-10-24 | 2002-10-24 | Method for reinforcing soft foundation by vacuum drainage and prepressing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1420239A true CN1420239A (en) | 2003-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02135018 Pending CN1420239A (en) | 2002-10-24 | 2002-10-24 | Method for reinforcing soft foundation by vacuum drainage and prepressing |
Country Status (1)
| Country | Link |
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| CN (1) | CN1420239A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314859C (en) * | 2004-09-10 | 2007-05-09 | 任再永 | Vacuum net water suction method and special water drainage board |
| CN100340721C (en) * | 2005-04-01 | 2007-10-03 | 东南大学 | Operation method for consolidating soft soil foundation by pneumatic flerry vacuum preloading method |
| CN100480472C (en) * | 2006-06-09 | 2009-04-22 | 华南理工大学 | Quick reinforcing method and reinforcing device for super soft weak soil |
| CN101542044B (en) * | 2006-11-27 | 2011-07-06 | 金东恒 | Drainage system using water drainable and permeable member for soil improvement of soft ground and soil improvement method for soft ground using the same |
| CN101016740B (en) * | 2007-03-05 | 2011-11-30 | 武亚军 | Multiple pressurizing fast consolidated compacting soft earth foundation treatment method |
| CN102459774A (en) * | 2009-04-16 | 2012-05-16 | 安德鲁·尼姆齐克 | Method for injecting surface water into the ground |
| CN102776877A (en) * | 2012-08-22 | 2012-11-14 | 吉林大学 | Stepped vacuum drainage consolidation method for ultra-soft soil foundation |
| CN104005401A (en) * | 2014-06-12 | 2014-08-27 | 天津大学 | Vacuum preloading solidification drainage channel |
| CN104264559A (en) * | 2014-09-24 | 2015-01-07 | 上海市政工程设计研究总院（集团）有限公司 | Vacuum preloading roadbed processing device and vacuum preloading roadbed construction method |
| CN104727299A (en) * | 2015-02-17 | 2015-06-24 | 中交一航局第四工程有限公司 | Vacuum preloading film pressing groove extension construction method |
-
2002
- 2002-10-24 CN CN 02135018 patent/CN1420239A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314859C (en) * | 2004-09-10 | 2007-05-09 | 任再永 | Vacuum net water suction method and special water drainage board |
| CN100340721C (en) * | 2005-04-01 | 2007-10-03 | 东南大学 | Operation method for consolidating soft soil foundation by pneumatic flerry vacuum preloading method |
| CN100480472C (en) * | 2006-06-09 | 2009-04-22 | 华南理工大学 | Quick reinforcing method and reinforcing device for super soft weak soil |
| CN101542044B (en) * | 2006-11-27 | 2011-07-06 | 金东恒 | Drainage system using water drainable and permeable member for soil improvement of soft ground and soil improvement method for soft ground using the same |
| CN101016740B (en) * | 2007-03-05 | 2011-11-30 | 武亚军 | Multiple pressurizing fast consolidated compacting soft earth foundation treatment method |
| CN102459774A (en) * | 2009-04-16 | 2012-05-16 | 安德鲁·尼姆齐克 | Method for injecting surface water into the ground |
| CN102776877A (en) * | 2012-08-22 | 2012-11-14 | 吉林大学 | Stepped vacuum drainage consolidation method for ultra-soft soil foundation |
| CN102776877B (en) * | 2012-08-22 | 2015-03-25 | 吉林大学 | Stepped vacuum drainage consolidation method for ultra-soft soil foundation |
| CN104005401A (en) * | 2014-06-12 | 2014-08-27 | 天津大学 | Vacuum preloading solidification drainage channel |
| CN104264559A (en) * | 2014-09-24 | 2015-01-07 | 上海市政工程设计研究总院（集团）有限公司 | Vacuum preloading roadbed processing device and vacuum preloading roadbed construction method |
| CN104727299A (en) * | 2015-02-17 | 2015-06-24 | 中交一航局第四工程有限公司 | Vacuum preloading film pressing groove extension construction method |
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| C06 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |