CN106284277A - A kind of air sac pressing draining combined vacuum precompressed foundation reinforcement method - Google Patents
A kind of air sac pressing draining combined vacuum precompressed foundation reinforcement method Download PDFInfo
- Publication number
- CN106284277A CN106284277A CN201610736809.XA CN201610736809A CN106284277A CN 106284277 A CN106284277 A CN 106284277A CN 201610736809 A CN201610736809 A CN 201610736809A CN 106284277 A CN106284277 A CN 106284277A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention relates to a kind of air sac pressing draining combined vacuum precompressed foundation reinforcement method.The present invention program is laying sand bedding course on ground, draining board is squeezed in ground, upper end communicated drainage pipe, drain pipe connects vacuum pump, squeezes into air bag, upper end connection gas tube in ground, gas tube connects inflator pump, starting vacuum pump to be discharged by water in draining board, start inflator pump and make airbag inflation extrusion soil, the soil body produces consolidation under the effect of vacuum pressure and gasbag pressure.The negative pressure of the malleation and draining board that instant invention overcomes Water penetrative flexible pipe connects, and reduces drainage effect on the contrary, the defect such as Water penetrative flexible pipe easily blocking in weak soil.Economical and effective of the present invention, saving the duration, be applicable to soil layer of different nature, consolidation effect is notable, is the reinforcement means of the economical and efficient of a kind of soft soil foundation.
Description
Technical field
The invention belongs to Soft Soil Subgrade Treatment Techniques field, particularly to a kind of air sac pressing draining combined vacuum precompressed ground
Base reinforcement means.
Background technology
Along with infrastructure constructions such as large-scale highway, high-speed railway, airport and harbours, to soft soil base sedimentation
Deformation control requires more and more higher, needs soft soil foundation is carried out consolidation process.Drainage industry is that a kind of cost is relatively low
Method for processing foundation, extensively applies in engineering.Vacuum method is the one of drainage industry, needs on the weak soil ground reinforced
Bury vertical drain in base underground, then lay sand bedding course on surface, then make to be reinforced soil in sand bedding course surface laying vacuum diaphragm
Body and atmospheric isolation, diaphragm seal edge carries out pile things on process, by the drainage pipeline buried underground in sand bedding course, uses vacuum pumping true
Empty so that it is forming negative pressure under film, gas and pore water in ground are drawn out of, and reach the purpose of soil solidifying.
Owing to vacuum method uses the principle of negative pressure of vacuum, its maximum pressure not can exceed that atmospheric pressure, in engineering
Typically can reach the negative pressure of 80～85kPa.If consolidation pressure to be further added by, then need by modes such as preloading joint preloadings real
Existing.
Before making the present invention, Chinese patent (200810156787.5) " supercharging vacuum preconsolidation soft soil foundation/tail
The method of slag/lake silt " method that discloses processing soft land base/tail slag/lake silt by supercharging preconsolidation at vacuum,
Belong to soft soil foundation/mine tailings/lake silt construction method, by some row's plastic drainings of horizontal arrangement in the soil body/slag/mud
Intralaminar part evacuation, simultaneously to the part soil body/slag/mud between plastic draining board by permeable pressure inlet uniform-pressurizing,
General employing Water penetrative flexible pipe carries out supercharging, and pressure is air pressure or water pressure, injects in the soil body by gas or water, increases in the soil body
The additional stress in face, makes foundation soil body be reinforced.But the method has the disadvantage that (1) injects gas or the water of the soil body
Directly contact formation malleation with the soil body, this pressure can not be too big, and typically at tens kPa, otherwise air pressure or hydraulic pressure easily puncture
The soil body, makes the malleation of Water penetrative flexible pipe connect with the negative pressure of draining board, and vacuum pressure weakens, and reduces drainage effect on the contrary.(2) increase
The distance of pressure pipe and draining board can not be the least, the most easily makes air pressure or the water pressure breakdown soil body, but draining board distance is too big again
Can not play good drainage effect, this is a contradiction.(3) in weak soil, Water penetrative flexible pipe easily blocks, and does not has supercharging
Effect.
Summary of the invention
It is an object of the invention to overcome drawbacks described above, it is provided that a kind of air sac pressing draining combined vacuum precompressed foundation stabilization
Method.
The technical scheme is that
A kind of air sac pressing draining combined vacuum precompressed foundation reinforcement method, it is mainly characterized by, including following
Technical step:
(1) on ground, sand bedding course is laid；
(2) squeezing into draining board in ground, upper end communicated drainage pipe, drain pipe connects vacuum pump；
(3) squeezing into air bag in ground, upper end connection gas tube, gas tube connects inflator pump；
(4) starting vacuum pump to be discharged by water in draining board, start inflator pump and make airbag inflation extrusion soil, the soil body is in vacuum
Consolidation is produced under the effect of pressure and gasbag pressure.
Sand bedding course is laid diaphragm seal.
Air bag is divided into multiple inflation storehouse, each inflation storehouse to arrange a gas tube from top to bottom, each inflation storehouse inflation
Pressure is different.
In air bag, each inflation storehouse pressure increases the most successively, and in air bag, the inflation storehouse air pressure of bottom is maximum.
Advantages of the present invention and effect are:
(1) using airbag boost air, gasbag pressure can accurately control, and pressure is up to more than 1MPa, such that it is able to make the soil body
Consolidation pressure greatly increases, and overcomes traditional vacuum ground preloading pressure and not can exceed that the defect of atmospheric pressure.
(2) gas separates with the soil body, and air pressure will not puncture the soil body, does not interferes with the drainage effect of vacuum preloading.
(3) owing to have employed air bag, the distance between draining board and air bag can be the least without making gas enter draining
Plate, the least draining consolidation rate of distance is the fastest.
(4) air bag pressurization is used, it is therefore prevented that the defect that tradition water-permeable pipe pressurization is easily blocked by mud.
(5) vacuum pressure makes the soil body form the trend of inwardly retraction, gasbag pressure make the soil body produce outwardly against trend,
Both bring out the best in each other, and make the soil body produce bigger consolidation stress, accelerate consolidation rate.
(6) air bag and gas tube are common rubber and plastic or other material, low price, and the letter of air bag construction technology
Single, easy to operate.
(7) air bag is separated into multiple gas storage storehouse, can apply different pressure at different depth.
Economical and effective of the present invention, saving the duration, be applicable to soil layer of different nature, consolidation effect is notable, is at a kind of
The reinforcement means of the economical and efficient of reason soft soil foundation.
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in detail.Protection scope of the present invention not with
Detailed description of the invention is limited, but is defined in the claims.
Accompanying drawing explanation
The cross-sectional view of Fig. 1 present invention.
The horizontal layout schematic diagram of Fig. 2 present invention.
In figure, each label represents that corresponding component names is as follows:
(plastics) draining board 1, air bag 2, diaphragm seal 3, sand bedding course 4.
Detailed description of the invention
As shown in Figure 1, 2:
First lay sand bedding course 4 at foundation surface, in ground, set plastic draining board 1 subsequently, and in ground, squeeze into gas
Capsule 2, then fix a drainpipe (omit in figure and be not drawn into, be common equipment) is connected with plastic draining board 1, installs gas tube
(omit in figure and be not drawn into, be common equipment) is connected with air bag 2, and drain pipe (is omitted in figure be not drawn into vacuum pump, be conventional
Equipment) it is connected, gas tube is connected with inflator pump (omit in figure and be not drawn into, be common equipment), lays close on the surface of sand bedding course 4
Sealer 3, opens vacuum pump evacuation and opens inflator pump and inflate air bag 2, and the soil body is in vacuum pressure and the effect of air bag 2 pressure
Lower generation consolidation is reinforced.
In the present invention in application process, concrete employing techniques below step realizes:
(1) arrange place and lay the thick sand bedding course 4 of one layer of 30cm-50cm, sand bedding course 4 one aspect play leveling place,
Improve the effect of top layer bearing capacity, on the other hand as the drainage channel of level.
(2) according to design require preset plastic draining board 1 and the position of air bag 2, plastic draining board 1 the most square or
Triangular arrangement, air bag 2 is positioned at center equidistant with each plastic draining board 1.
(3) utilizing sheeting machine to set plastic draining board 1, plastic draining board 1 construction depth meets design requirement, plastic draining
Earth's surface 30～50cm is exposed at plate 1 top, in order to be connected with horizontal drain pipe.
(4) arranging air bag 2 in ground, air bag 2 stretches out earth's surface 20～30cm.The construction method of air bag 2 is divided into two kinds: right
In super soft grounds such as blowing-filling sludges, air bag 2 is enclosed within wooden stick or sticking plaster, wooden stick or sticking plaster are inserted directly into ground
In, air bag 2 and then wooden stick or sticking plaster enter ground, then extract wooden stick or sticking plaster is reused, and ground stayed by air bag 2
In；For the ground that soil layer is harder, air bag 2 being inserted in a steel duct, steel tube end part arranges shoe, and air bag 2 is with shoe even
Connecing, steel pipe is squeezed under the protection of shoe the Foundation Design degree of depth, then extracts steel pipe, air bag 2 is stayed in ground.
(5) horizontal drain pipe is arranged in ground on the scene, and horizontal drain pipe is consistent with plastic draining board 1 spacing, horizontal drain pipe
Being pooled to drain header, drain header connects vacuum pump, every 1000m2-1500m2Arrange a vacuum pump.
(6) level inflation pipe is arranged in ground on the scene, and level inflation pipe is consistent with air bag 2 spacing, and level inflation pipe is arranged
Three way cock, one end of joint is connected with air bag 2, and air bag 2 is tight in joint colligation, prevents gas leakage；The other two ends of joint are even
The flat gas tube of water receiving；Level inflation pipe is connected to inflator pump after being collected by inflation supervisor.
(7) on horizontal drain pipe and gas tube, lay one layer of geotextiles, geotextiles is laid two-layer diaphragm seal 3, will
Drainage system and gas charging system cover diaphragm seal 3 times, and then diaphragm seal 3 indentation sealing ditch is backfilled clay and be compacted, so
Can make to be reinforced the soil body to be closed and maintain vacuum pressure；
(8) start vacuum pump evacuation 1～2 hours, be then turned on inflator pump and air bag 2 is inflated.Vacuum pressure is from level
Drain header is delivered to horizontal drainage branch, then is delivered to plastic draining board 1, and spreads in ground.Air pressure is then by inflation
Pipe injects air bag 2, and air bag 2 expansion extrusion soil produces additional stress.
(9), after vacuum pump and inflator pump open a period of time simultaneously, can close inflator pump a period of time, the most reinflated,
So repeatedly being interrupted inflation, make foundation soil receive the effect of pulsating stress, consolidation effect is more preferable；
(10) carry out on-the-spot every monitoring, draw settlement-time relation curve, until settlement stability meets unloading condition
After, stop inflation, use vacuum preloading to continue to reinforce a period of time, make soil body retraction fill up the hole that air bag 2 is formed.
Described the blowing pressure is typically 20～1000kPa, and the blowing pressure is less than the soil pressure in soil body horizontal direction.
Owing to the horizontal earth pressure of ground different depth is different, the deepest soil pressure of the ground degree of depth is the biggest, therefore air bag 2
Can be separated into multiple inflation storehouse from top to bottom, each inflation storehouse is filled with the gas of different pressures, and the deepest the blowing pressure of the degree of depth is the biggest,
With equilibrium level soil pressure.
Claims (4)
1. an air sac pressing draining combined vacuum precompressed foundation reinforcement method, it is characterised in that include techniques below step:
(1) on ground, sand bedding course is laid；
(2) squeezing into draining board in ground, upper end communicated drainage pipe, drain pipe connects vacuum pump；
(3) squeezing into air bag in ground, upper end connection gas tube, gas tube connects inflator pump；
(4) starting vacuum pump to be discharged by water in draining board, start inflator pump and make airbag inflation extrusion soil, the soil body is at vacuum pressure
Consolidation is produced with under the effect of gasbag pressure.
A kind of air sac pressing draining combined vacuum precompressed foundation reinforcement method the most according to claim 1, it is characterised in that
Sand bedding course is laid diaphragm seal.
A kind of air sac pressing draining combined vacuum precompressed foundation reinforcement method the most according to claim 1, it is characterised in that
Described air bag is divided into multiple inflation storehouse, each inflation storehouse to arrange a gas tube from top to bottom, each inflation storehouse the blowing pressure
Different.
A kind of air sac pressing draining combined vacuum precompressed foundation reinforcement method the most according to claim 3, it is characterised in that
In described air bag, each inflation storehouse pressure increases the most successively, and in air bag, the inflation storehouse air pressure of bottom is maximum.
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| CN201610736809.XA CN106284277A (en) | 2016-08-22 | 2016-08-22 | A kind of air sac pressing draining combined vacuum precompressed foundation reinforcement method |
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| CN201610736809.XA CN106284277A (en) | 2016-08-22 | 2016-08-22 | A kind of air sac pressing draining combined vacuum precompressed foundation reinforcement method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107034873A (en) * | 2017-06-08 | 2017-08-11 | 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 |
| CN107100161A (en) * | 2017-05-23 | 2017-08-29 | 天津大学 | A kind of vacuum bellows fluid injection is pressurized joint grouting and reinforcing super soft ground processing system |
| CN107190726A (en) * | 2017-05-23 | 2017-09-22 | 天津大学 | A kind of fluid injection pressure charging system handled for super soft ground |
| CN107217661A (en) * | 2017-05-23 | 2017-09-29 | 浙江省水利水电勘测设计院 | A kind of Soft Ground Improved By Vacuum Preloading ruggedized construction of base expanding and base expanding Pressure water discharging joint inflation drainage |
| CN107268567A (en) * | 2017-05-23 | 2017-10-20 | 天津大学 | The fluid injection of vacuum bellows is pressurized joint grouting and reinforcing super soft ground processing method |
| CN107268568A (en) * | 2017-05-23 | 2017-10-20 | 天津大学 | The fluid injection of vacuum bellows is pressurized joint grouting and reinforcing super soft ground fluid injection supercharging device |
| CN107673581A (en) * | 2017-11-21 | 2018-02-09 | 中交第二航务工程勘察设计院有限公司 | The pillar mud drying equipment and application method that a kind of suction pressure combines |
| CN108894207A (en) * | 2018-07-27 | 2018-11-27 | 湖南宏禹工程集团有限公司 | The method of extrusion drainage device and reinforcing soft ground for reinforcing soft ground |
| CN110130315A (en) * | 2019-05-09 | 2019-08-16 | 同济大学 | In conjunction with air bag hole in pneumatic radial precompressed vacuum drainage panel assembly and drainage system |
| CN110593248A (en) * | 2019-09-10 | 2019-12-20 | 盐城工学院 | Method for promoting rapid dehydration of dredged fluid mud based on straw fermentation |
| CN111827248A (en) * | 2020-03-26 | 2020-10-27 | 同济大学 | System and method for air bag expansion pressurization and vacuum-electroosmosis composite dewatering and dewatering in hole |
| CN112030935A (en) * | 2020-08-31 | 2020-12-04 | 广东劲拓建设工程有限公司 | Method for treating piping of deep foundation pit |
| CN112279484A (en) * | 2020-10-19 | 2021-01-29 | 上海市城市建设设计研究总院（集团）有限公司 | Vacuum combined pressurizing sludge and slurry rapid dewatering device |
| CN111549753B (en) * | 2020-04-30 | 2021-06-04 | 同济大学 | Vacuum preloading foundation treatment system and method combining transverse pressurization in hole |
| CN112962573A (en) * | 2021-02-23 | 2021-06-15 | 江苏筑港建设集团有限公司 | Soft foundation reinforcement treatment structure and method combining surcharge preloading and vacuum preloading |
| 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 |
| CN115126009A (en) * | 2022-06-10 | 2022-09-30 | 河海大学 | Device for reducing relative compactness of saturated sandy soil field and construction method |
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| 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 |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107268568A (en) * | 2017-05-23 | 2017-10-20 | 天津大学 | The fluid injection of vacuum bellows is pressurized joint grouting and reinforcing super soft ground fluid injection supercharging device |
| CN107100161A (en) * | 2017-05-23 | 2017-08-29 | 天津大学 | A kind of vacuum bellows fluid injection is pressurized joint grouting and reinforcing super soft ground processing system |
| CN107190726A (en) * | 2017-05-23 | 2017-09-22 | 天津大学 | A kind of fluid injection pressure charging system handled for super soft ground |
| CN107217661A (en) * | 2017-05-23 | 2017-09-29 | 浙江省水利水电勘测设计院 | A kind of Soft Ground Improved By Vacuum Preloading ruggedized construction of base expanding and base expanding Pressure water discharging joint inflation drainage |
| CN107268567A (en) * | 2017-05-23 | 2017-10-20 | 天津大学 | The fluid injection of vacuum bellows is pressurized joint grouting and reinforcing super soft ground processing method |
| 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 |
| CN107034873A (en) * | 2017-06-08 | 2017-08-11 | 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 |
| CN107673581A (en) * | 2017-11-21 | 2018-02-09 | 中交第二航务工程勘察设计院有限公司 | The pillar mud drying equipment and application method that a kind of suction pressure combines |
| CN107673581B (en) * | 2017-11-21 | 2024-01-23 | 中交第二航务工程勘察设计院有限公司 | Suction-compression combined column type sludge drying equipment and use method |
| CN108894207A (en) * | 2018-07-27 | 2018-11-27 | 湖南宏禹工程集团有限公司 | The method of extrusion drainage device and reinforcing soft ground for reinforcing soft ground |
| CN110130315A (en) * | 2019-05-09 | 2019-08-16 | 同济大学 | In conjunction with air bag hole in pneumatic radial precompressed vacuum drainage panel assembly and drainage system |
| CN110593248A (en) * | 2019-09-10 | 2019-12-20 | 盐城工学院 | Method for promoting rapid dehydration of dredged fluid mud based on straw fermentation |
| CN111827248A (en) * | 2020-03-26 | 2020-10-27 | 同济大学 | System and method for air bag expansion pressurization and vacuum-electroosmosis composite dewatering and dewatering in hole |
| CN111549753B (en) * | 2020-04-30 | 2021-06-04 | 同济大学 | Vacuum preloading foundation treatment system and method combining transverse pressurization in hole |
| CN112030935A (en) * | 2020-08-31 | 2020-12-04 | 广东劲拓建设工程有限公司 | Method for treating piping of deep foundation pit |
| CN112279484A (en) * | 2020-10-19 | 2021-01-29 | 上海市城市建设设计研究总院（集团）有限公司 | Vacuum combined pressurizing sludge and slurry rapid dewatering device |
| CN112962573A (en) * | 2021-02-23 | 2021-06-15 | 江苏筑港建设集团有限公司 | Soft foundation reinforcement treatment structure and method combining surcharge preloading and vacuum preloading |
| 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 |
| CN115126009A (en) * | 2022-06-10 | 2022-09-30 | 河海大学 | Device for reducing relative compactness of saturated sandy soil field and construction method |
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