CN1055978C - Low-vacuum prepressurizing process for reinforcing and raising soft soil foundation - Google Patents
Low-vacuum prepressurizing process for reinforcing and raising soft soil foundation Download PDFInfo
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- CN1055978C CN1055978C CN 97100652 CN97100652A CN1055978C CN 1055978 C CN1055978 C CN 1055978C CN 97100652 CN97100652 CN 97100652 CN 97100652 A CN97100652 A CN 97100652A CN 1055978 C CN1055978 C CN 1055978C
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Abstract
The present invention relates to a low position vacuum prepressurizing method for consolidating and raising soft soil foundations, particularly to a technological method for consolidating soft soil foundations and raising the height by dredger fill. A duplex water filtering pipe network is embedded in soft soil foundations, dredger fill is filled in a cofferdam of the soft soil foundations, and a sealing water collecting well is used for pumping water and exhausting gas; negative pressure is generated in the water filtering pipe network, and the soft soil foundations and dredger fill bodies are forced to release water to the water filtering pipe network and are consolidated; when the surface layers of the dredger fill bodies are cracked, plastic films are covered on the surfaces, the water is continuously pumped, and the gas is continuously exhausted until the soft soil foundations reach the design height and meet the consolidating requirements. The present invention has the advantages of easy construction, energy consumption saving, high low position vacuum degree, good consolidating effect and short period.
Description
The present invention relates to the process of a kind of vacuum prepressing reinforcement soft soil base, particularly relating to a kind of is the process that the vacuum pre-press reinforcing of vacuum seal layer is raised soft foundation with the serous fluid of dredger fill.
The process of reinforcing soft ground has a variety of, particularly after the World War II, reinforces on the theoretical basis at Tai Shaji, reinforced soft soil ground technology such as load precompressed, lime pile, pellicle, sand drain and electric osmose occurred.After nineteen fifty-two W.Kjcunlan had initiated the vacuum preloading new technology, sand drain vacuum preloading and plastics sheet pile vacuum preloading equal vacuum ground preloading technology had successively appearred.1985, the engineers and technicians of China Science Institute of the First Voyage Engineering Bureau, Ministry of Communicat invented the new technology (CN85108820A) of the plastic plate stake vacuum prepressing reinforcement soft soil base of swimming, and made that vacuum reaches more than the 80KPa under the film.1986, the engineers and technicians of this research institute have proposed the process (CN86107233B) of combined vacuum and surcharge preloading reinforcing soft ground again, and this process is used preloading stack on vacuum preloading under the film and the film, and consolidation effect is brought up to more than the 100KPa.
Compare with other vacuum pre-press reinforcing method, the process of combined vacuum and surcharge preloading reinforcing soft ground can obtain better consolidation effect.But also there are some obvious defects in this process itself and have limited using and implementing of this process to a great extent.At first, the vacuum seal technology in this process is quite complicated, is unfavorable for large-area construction especially, and sealing effectiveness also is difficult to guarantee.In this process, vacuum system utilizes plastic sheeting to seal, and it is large stretch of that the plastic sheeting of fritter needs heat seal, and the plastic sheeting of stabilization zone periphery also need be pressed and be put in the groove that excavates in advance.In construction and precompressed process, plastic sheeting also breaks easily and cause gas leakage, so often need to lay multi-layer sealed film and on diaphragm seal, set up the water seal layer.In case and diaphragm seal breaks, then not only can influence sealing effectiveness, and can increase moisturizing and draining energy consumption greatly.Secondly, in this process, the vertical not direct and horizontal filtration pipe overlap joint of plastic draining sheet pile that inserts in the soft foundation, but through the sand cushion transmission, the horizontal filtration pipe in the sand cushion is connected with centrifugal pump with the jet pump of drawing ground, finishes and make pressure water.Obviously, this making presses the efficient and the rate of pressure rise of pressure transmission system all very low, and it is very high to make the pressure energy consumption.In addition, in this reinforcement means, the construction that is used for transmitting the sand cushion of vacuum has certain requirement for soft foundation top layer bearing capacity, mould the shape ultra-soft foundation for large tracts of land stream, reaching this requirement for bearing capacity needs drainage 200-300 days at least, the reinforcing cycle of the soft foundation that certainly will extend greatly.
Purpose of the present invention promptly is the sealing technology of vacuum system in the process of above-mentioned vacuum prepressing reinforcement soft soil base and makes the in addition suitable improvement of formation of pressing pressure transmission system, to improve consolidation effect and significantly to reduce and reinforce energy consumption, effectively shorten the reinforcing cycle simultaneously and make strengthening construction more convenient.
To achieve these goals, the present invention replaces the sealant of plastic sheeting as vacuum system with serous fluid of dredger fill; The compound filter pipe net of pre-buried low level and construct the sealing collecting well in the soft foundation below the hydraulic reclamation soil body at the tail end of filter pipe net; Utilize submersible pump and vacuum pump by the collecting well exhaust of drawing water, make and cause negative pressure in the compound filter pipe net and to make the soft foundation and the hydraulic reclamation soil body force to release water in compound filter pipe net fixed.
In the present invention, not only can obtain good sealing effectiveness as the sealant of vacuum system, and utilize the flowability of serous fluid of dredger fill that sealing technology is greatly simplified, therefore be particularly suitable for the large tracts of land reinforcing soft ground with certain thickness serous fluid of dredger fill.In the compound filter pipe net of low level of the present invention, vertical plastic draining sheet pile and the horizontal filtration pipe net that inserts soft foundation directly overlaps, can effectively reduce the vacuum transmission loss, significantly improve rate of pressure rise, can realize gas-water separation, effectively reduce the precompressed energy consumption by the exhaust of drawing water of sealing collecting well.The hydraulic reclamation soil body after fixed can remedy soft foundation because of releasing the fixed sedimentation loss that causes of water, raising its elevation, and adjustable desilting and epeirogenetic get both.Therefore, the present invention will be specially adapted on a large scale reinforced soft soil ground and utilize serous fluid of dredger fill to raise the reclaiming land around sea or the depression epeirogenetic engineering of its elevation.Be described in further detail below in conjunction with the technical characterictic of specific embodiment low position vacuum preloading reinforced soft soil ground method of the present invention.
Accompanying drawing 1 and accompanying drawing 2 are respectively the vertical view and the sectional view of compound filter pipe net and sealing collecting well.
1 accompanying drawing 2 with reference to the accompanying drawings, the main processes of low position vacuum preloading reinforced soft soil ground method of the present invention is, cofferdam 2 is constructed in periphery at the soft foundation 1 that needs reinforcement and raise, on the soft foundation 1 in cofferdam 2 pre-buried compound filter pipe net and the tail end of filter pipe net construct the sealing collecting well 3; Then, in cofferdam 2, be blown into serous fluid of dredger fill with the sealing filter pipe net and utilize submersible pump 4 and vacuum pump 5 by collecting well 3 exhaust of drawing water, make cause negative pressure in the compound filter pipe net and make soft foundation 1 and the hydraulic reclamation soil body 6 to force to release water in compound filter pipe net fixed; In case of necessity, treat the hydraulic reclamation soil body 6 top layers dry and cracked after again at its surface coverage plastic sheeting 7 and continue the exhaust of drawing water, reach design altitude and reinforce requirement until the soft foundation 1 and the hydraulic reclamation soil body 6.
Compound filter pipe net among the present invention can be made of first-level pipeline network, secondary pipeline and plastic draining sheet pile battle array.Secondary pipeline 8 can adopt the double-walled pvc pipe, and horizontal laying is on soft foundation 1, and its pipe tail feeds collecting well 3.First-level pipeline network can be arranged in parallel by many dual damascene filter pipes 9 and constitute, and dual damascene filter pipe 9 is uniformly distributed in the both sides in diode road 8 and pegs graft with secondary pipeline 8, and pipe is outer can be swathed non-woven geotextile and enclose back-up sand filtering layer 10.Plastic draining sheet pile battle array is by multi-disc plastic draining sheet pile 11 evenly distributed formation, each plastic draining sheet pile 11 is vertical insert in the soft foundation 1 of first-level pipeline networks below and with two filter line filter pipes 9 overlap joints of first-level pipeline network.
Practice shows, when adopting the soft last foundation consolidation process of low position vacuum preloading of the present invention to reinforce the soft foundation of 500,000 square metres of areas, only need construct a corral weir in the stabilization zone periphery.Compound filter pipe net lay finish after, in the cofferdam, be blown into serous fluid of dredger fill continuously, only need compound filter pipe net was all sealed in 10 days; Vacuum system after the sealing only need be drawn water exhaust 5-6 days, can reach the above condition of high vacuum degree of 90KPa.After tested, only about the low 2KPa of vacuum than the sealing collecting well, the vacuum transmission loss of visible system is minimum for the vacuum of vacuum system distal-most end.Practice shows that also the serous fluid of dredger fill sealant that 1.2-1.5 rice is thick can make the above condition of high vacuum degree 80-100 of system held 80KPa days; After vacuum ground preloading in 100 days, the soft degree of consolidation that goes up foundation soil can reach 85%, and the degree of consolidation of the hydraulic reclamation soil body also can reach 80%, and the reinforcing cycle is very short, and consolidation effect is considerable.Reinforce energy consumption and also economize very much, 7.5 kilowatts dynamical system can be born 10,000 square metres stabilization zone.
Claims (2)
1, a kind of low position vacuum preloading reinforced soft soil ground method is characterized in that constructing the cofferdam in the soft foundation periphery of raising that needs reinforcement, pre-buried compound filter pipe net and construct the sealing collecting well at the tail end of filter pipe net on the soft foundation in the cofferdam; In the cofferdam, be blown into serous fluid of dredger fill with seal compound filter pipe net and utilize submersible pump and vacuum pump by the collecting well exhaust of drawing water, make cause negative pressure in the compound filter pipe net and make soft foundation and the hydraulic reclamation soil body to force to release water in compound filter pipe net fixed; Treat barged-in fill body surface layer dry and cracked after again at barged-in fill surface covered with plastic film and continue the exhaust of drawing water, reach design altitude and reinforce requirement until the soft foundation and the hydraulic reclamation soil body.
2, low position vacuum preloading reinforced soft soil ground method according to claim 1 is characterized in that described compound filter pipe net is made of the secondary pipeline that interconnects, first-level pipeline network and plastic draining sheet pile battle array; The secondary pipeline is the double-walled pvc pipe, and horizontal laying is on soft foundation, and its pipe tail feeds collecting well; First-level pipeline network is arranged in parallel by many dual damascene filter pipes and constitutes, be uniformly distributed in both sides, diode road and peg graft with the secondary pipeline, plastic draining sheet pile battle array is by evenly distributed formation of multi-disc plastic draining sheet pile, and each plastic draining sheet pile vertically inserts in the soft foundation of first-level pipeline network below and with first-level pipeline network and overlaps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97100652 CN1055978C (en) | 1997-03-07 | 1997-03-07 | Low-vacuum prepressurizing process for reinforcing and raising soft soil foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97100652 CN1055978C (en) | 1997-03-07 | 1997-03-07 | Low-vacuum prepressurizing process for reinforcing and raising soft soil foundation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1158932A CN1158932A (en) | 1997-09-10 |
| CN1055978C true CN1055978C (en) | 2000-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 97100652 Expired - Fee Related CN1055978C (en) | 1997-03-07 | 1997-03-07 | Low-vacuum prepressurizing process for reinforcing and raising soft soil foundation |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101302757B (en) * | 2008-03-07 | 2010-06-09 | 张伯谦 | Method for quickly processing heavy layer soft soil foundation |
| CN101824818B (en) * | 2010-05-10 | 2012-11-28 | 天津市海岸带工程有限公司 | Method for consolidating hydraulically-filled soft clay in hydraulic filling process by using vacuum preloading method |
| CN102108711A (en) * | 2010-11-29 | 2011-06-29 | 天津大学 | Large-size head cover loaded type shallow foundation component and self-strengthening method thereof |
| CN102199923A (en) * | 2011-03-14 | 2011-09-28 | 江苏省淮河入海水道工程管理处 | Bottom water drainage system of open type underwater concrete detection device |
| CN102296589A (en) * | 2011-06-02 | 2011-12-28 | 浙江大学 | Foundation drainage method of well point water-drawing control group pipe siphon |
| CN103352458B (en) * | 2013-07-02 | 2016-01-13 | 南京瑞迪建设科技有限公司 | Controllable type negative pressure of vacuum well high-efficiency water-absorbing concretion method under film |
| CN106840086B (en) * | 2017-02-22 | 2023-04-18 | 天津城建大学 | Quick consolidation soft soil test device of ultralow position vacuum preloading method |
| CN107268364A (en) * | 2017-06-20 | 2017-10-20 | 天津大学 | The construction method that mud bag builds road is filled on reclaimed ground |
| CN107338711A (en) * | 2017-06-20 | 2017-11-10 | 中交天津港湾工程研究院有限公司 | A kind of construction method that road is built on soft soil foundation |
| CN110230313A (en) * | 2019-04-28 | 2019-09-13 | 中国市政工程华北设计研究总院有限公司 | Low Low Level drains vacuum pre-pressed soft soil foundation processing method |
| CN112709190A (en) * | 2020-12-25 | 2021-04-27 | 浙江省围海建设集团股份有限公司 | Dam reinforcement control method |
| CN113152499A (en) * | 2021-03-19 | 2021-07-23 | 国网河北省电力有限公司邢台供电分公司 | Cofferdam backfill reinforced foundation and construction method |
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1997
- 1997-03-07 CN CN 97100652 patent/CN1055978C/en not_active Expired - Fee Related
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| CN1158932A (en) | 1997-09-10 |
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