CN109295969A - The construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation - Google Patents
The construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation Download PDFInfo
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- CN109295969A CN109295969A CN201810975126.9A CN201810975126A CN109295969A CN 109295969 A CN109295969 A CN 109295969A CN 201810975126 A CN201810975126 A CN 201810975126A CN 109295969 A CN109295969 A CN 109295969A
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- Prior art keywords
- drain bar
- vacuum
- different length
- soft soil
- short
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Classifications
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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
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0053—Production methods using suction or vacuum techniques
Abstract
The invention discloses the construction technologies of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation, it is characterised in that includes the following steps: that (1) is first inserted into short plastic draining board in the blowing-filling sludge of upper layer, is laid with horizontal pipe network, carries out short-term vacuumize process；(2) using the mechanical long plastic draining board of inserting piling, be laid with horizontal pipe network, long drain bar carry out the long drain bar of classification vacuum processing (3) carry out it is intermittent vacuumize with plenum alternate treatment, accelerate the discharge of water in weak soil, short slab persistently carries out vacuum consolidation.Shorten 20% or more than conventional vacuum preloading method using the duration after this method, the degree of consolidation is high, and settlement after construction is small, and highly-safe, price is low.
Description
Technical field
The present invention relates to a kind of method of Soft Ground, especially one kind to be applicable in coastal, riparian area reclamation by pumping filling
The soft soil consolidation of the low bearing capacity formed, belongs to the technical field of Soft Ground.
Background technique
The soft soil foundation of coastal area is essentially divided into the barged-in fill on upper layer and the depositional organic matter clay of lower layer.Barged-in fill
Essentially mud and muddy soft soil, with water content height, poor permeability, intensity is low, personnel and machinery can not directly march into the arena
Feature, the high saturability of lower layer's depositional organic matter clay, low-intensity are low.Traditional vacuum preloading method reinforces beach soft soil foundation process
In, it needs first to carry out natural drying to top barged-in fill or is laid with sand bedding course, so that top barged-in fill is able to bear board-plugging device and march into the arena
The load that construction generates.But it natural drying and is laid with sand bedding course and needs to consume longer time and a large amount of sandstone material, and after
Drain bar, which is set, during phase reinforcing soft soil is easy to produce earth pillar and in blocking up, needs that longer time is spent to carry out true around drain bar
Empty ground preloading.
The duration is reinforced in order to shorten, quickly crust layer is formed in earth's surface and marches into the arena construction convenient for personnel and machinery, this engineering method general
The economic spacing of the drain bar of upper layer barged-in fill is set as 0.4m, and to lower layer's depositional organic matter clay, since drain bar is constructed
There are smear zones, set 0.7 ~ 1.2m for draining plate spacing, avoid spacing setting is too small each drain bar is made to smear area overlapping, cause
Making the discharging consolidation rate of lower layer's soil body reduces.The Soft Ground later period carries out series turbocharging and vacuum preloading using long slab
Alternate treatment is effectively relieved the formation of earth pillar around stifled and drain bar of drain bar, shortens the time of vacuum preloading processing.
Beach soft soil foundation is difficult to reach preferable consolidation effect and be added using the conventional vacuum method processing of tradition
Gu the duration is longer, and uses different length drain bar series turbocharging technique of soft soil foundation treatment, pre- using long short slab, small spacing, vacuum
The method of pressure and pressurization alternate treatment can improve around drain bar that earth pillar is formed and drain bar is in stifled, effectively shorten vacuum preloading when
Between and improve the treatment effect of vertical different depth weak soil, there is promotional value.
Summary of the invention
Above-mentioned technical problem present in present invention aims to solve the prior art provides a kind of soft for coastal area
The construction method of soil processing, in the vacuum method, different length drain bar point spacing is set, and is carried out to the soil body of different depth
Processing, can not only reduce engineering construction cost, but also can be shortened the engineering construction period, improve the returns of investment of engineering.
To achieve the above object, the present invention is achieved by the following technical solutions:
The construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation, it is characterised in that include the following steps:
1) it is first inserted into short plastic draining board in the blowing-filling sludge of upper layer, is laid with horizontal pipe network, carries out short-term vacuumize process；
2) using the long plastic draining board of mechanical inserting piling, drain bar upper end is embedded under the soil body of surface layer no less than 50cm.It is laid with horizontal tube
Net carries out lower layer's soil body to vacuumize reinforcing；
3) vacuum fractionation load is carried out with long drain bar, classification load is 20kPa, 40kPa, 60kPa, 80kPa；
4) intermittent vacuumize is carried out using long drain bar to handle with plenum, accelerate the discharge of water in weak soil, while short row
Water plate persistently carries out vacuumize process.
The beneficial effects of the present invention are:
1, top blowing-filling sludge is carried out with short drain bar to be handled, drain bar arrangement is carried out using small spacing, accelerates top
The rate of consolidation of mud forms shallow-layer " crust layer " in the short time, marches into the arena construction convenient for machinery, avoiding machinery, mud goes out up to one's neck in
It now damages, improves personnel and mechanical safety in work progress.
2, it is handled using the drain bar of different length, does not have to choose identical length for top and the bottom soil layer drain bar
The unified spacing with arrangement, chooses different length respectively and arranges the spacing of economical rationality, not only save material, but also improve soil
The rate of consolidation of body, shortens the duration.
3, the long drain bar system later period is vacuumized and is pressurized alternate treatment, circulate operation, promote water in the soil body to
Drain bar gathers, and avoids drain bar silting, accelerates drainage rates, and the duration can shorten 20%.
4, short drain bar arrangement takes small spacing to arrange, barged-in fill surface layer does not need to be laid with sand bedding course, saves material, especially
It is the area less in sandstone material, reduces construction cost.
Detailed description of the invention
Fig. 1 is the schematic cross-sectional view of the compound vacuum method soft soil foundation of different length drain bar of the invention；
Fig. 2 is the pipeline distribution schematic diagram of the compound vacuum method soft soil foundation of different length drain bar of the invention.
In figure: 1- geotechnique works out cloth；The short drain bar of 2-；3- non-woven geotextile；4- vacuum diaphragm；5- seals press mold ditch；6- is short
Drain bar pipe network；7- vacuum control check valve；8- pressurization check valve；9- three-way connection；10- vacuum pump；11- booster pump；12- long draining
Plate；13- long drain bar pipe network；14- vacuum control check valve；15- vacuum pump；16- butterfly plate connector.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
Shown in reference picture 1, Fig. 2, a kind of different length drain bar of the invention is pressurized at compound vacuum pre-pressed soft soil foundation
Manage constructing device, drain bar, horizontal drainage pipeline, vacuum pump, pressurization including two kinds of different lengths being inserted in soft soil foundation
Pump.Fig. 2 is the arrangement of pipe network in horizontal drainage system.Length drain bar is all made of monoblock type drain bar, the choosing of horizontal drainage pipeline
Use wired hose.
The construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation, the steps include:
1) preparation of construction
First carry out vacuumizing for upper layer blowing-filling sludge.Preparation of construction first to draining in hydraulic fill foundation, and sets up pontoon bridge, uses
Cystosepiment is laid between each construction subregion, is 2 ~ 3m in the spacing of the batten of cystosepiment two sides insertion 5m long, batten, then use iron
Cystosepiment together with batten binding, is allowed to be combined into entirety by line, can meet personnel's walking and transport of materials
It is required that；
2) it is laid with geotechnological woven cloth
One layer of 150g/m is laid on blowing-filling sludge surface2Geotechnological woven cloth 1, certain bearing capacity is provided, so that construction personnel
It can walk on surface reluctantly and prevent mud from entering horizontal drainage system；
3) the short drain bar of inserting piling and the horizontal pipe of short drain bar system are laid
Throughout reason distinguish draw a block of cells carry out examination insert, according to try insert depth and distribution adjustment block of cells, determine cutting length；So
The short drain bar 2 of spacing inserting piling of design requirement is pressed afterwards；Horizontal wire hose 6 is placed into designated position as required, wired hose 6 it
Between keep being parallel to each other, spacing is connected among wired hose 6 and drain bar 2 with butterfly plate connector 16 by design requirement arrangement in Fig. 2
It connects；
4) non-woven geotextile and vacuum diaphragm are laid with
3 one layers of non-woven geotextile are laid with, the vacuum diaphragm 4 with protection for sealing, geotextiles 3 are required using not less than 250g/m2
Non-woven geotextile；Then two-layer pvc vacuum diaphragm 4 is layed in place earth's surface, stabilization zone surrounding respectively stretches out 2 m or so；
Sealing press mold ditch 5 is carried out after the completion of being laid with；
5) short drain bar system vacuumizes
Top blowing-filling sludge is carried out after the completion of sealing vacuumizes reinforcing.Vacuumize process is carried out using vacuum pump 15.It opens true
Empty check-valves 14 carries out vacuum examination and takes out, checks leakproofness；Leakproofness, which reaches, to be evacuated to 80kPa or more for vacuum after requirement and surely carries, directly
To upper layer reclaimed ground bearing capacity reach scene selection plate machinery construction requirement after termination of pumping；
6) the long drain bar of inserting piling and the horizontal pipe of long drain bar system are laid
Upper layer blowing-filling sludge reaches construction machinery and marches into the arena after requirement, carries out the laying of long drain bar 12 and horizontal pipe 13.By setting
Desired spacing inserting piling drain bar 12 is counted, drain bar upper end is embedded under the soil body of surface layer no less than 50cm；Horizontal pipe 13 uses steel
Silk hose, is placed into designated position as required, keeps being parallel to each other between wired hose, and spacing is arranged by design requirement；
7) non-woven geotextile and vacuum diaphragm are laid with
3 one layers of non-woven geotextile are laid with, to protect the vacuum diaphragm 4 for sealing, is then laid with two-layer pvc vacuum diaphragm 4
In place earth's surface, stabilization zone surrounding respectively stretches out 2 m or so；Sealing press mold ditch 5 is carried out after the completion of being laid with；
8) it is classified pressurized treatment
Long drain bar carries out 4 grades of vacuum fractionation processing.Pressurization check valve 8 and booster pump 11 are closed, vacuum control check valve 7 and true is opened
Sky pump 10.Long drain bar 12 is connected to pumped vacuum systems.It is first evacuated to 20kPa surely to carry 3 days, then is evacuated to 40kPa and surely carries 5 days, then
It being evacuated to 60kPa surely to carry 10 days, finally be evacuated to >=80kPa reduces after surely carrying 65 ~ 70 days to displacement, all average settlements are down to 30 ~
50mm；
9) it vacuumizes and pressurized treatment
The soil body in entire processing depth bounds is vacuumized with long drain bar and pressurized treatment.It is dropped to all average settlements
It to 30 ~ 50mm, is pressurized with long slab, opens pressurization check valve 8 and booster pump 11, close vacuum control check valve 7 and vacuum
Pump 10.Pressure control of constructing is in 20kPa hereinafter, being once pressurized daily, pressurization time is about 2 hours.Vacuum degree when pressurization
Stop pressurization when being reduced to 70kPa, closes pressurization check valve 8 and booster pump 11.Long drain bar system is gone into pumping very by being pressurized
Sky closes pressurization check valve 8 and booster pump 11, reopens vacuum control check valve 7 and vacuum pump 10, carry out vacuumizing place again
Reason, continues to be evacuated to 80kPa or more, the such plenum of long drain bar system and evacuation cycle.Short drain bar 2 continue into
Row vacuumize process opens vacuum control check valve 14 and vacuum pump 15, vacuumizes and continue to be decreased to less than 10mm to all average settlements, or
When reaching basement process requirement, vacuumizes and pressurization terminates.
Claims (6)
1. the construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation, it is characterised in that including walking as follows
It is rapid:
(1) it is first inserted into short plastic draining board in the blowing-filling sludge of upper layer, is laid with horizontal pipe network, carries out short-term vacuumize process；
(2) using the long plastic draining board of mechanical inserting piling, drain bar upper end is embedded under the soil body of surface layer no less than 100cm, is laid with horizontal
Pipe network；
(3) classification vacuumize process is carried out using long drain bar；
(4) using long drain bar carry out it is intermittent vacuumize and plenum, accelerate the discharge of water in weak soil, short slab is persistently taken out very
Sky, vacuum pressure maintain 80kPa or more.
2. the construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation as described in claim 1, special
Sign is: vacuumize process in step (1) is short-term processing, and upper layer barged-in fill is handled and reaches construction machinery to intensity and marches into the arena
It is required that.
3. the construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation as described in claim 1, special
Sign is: in step (2) drain bar plug needs and etc. (1) middle or short term vacuumize completions, the upper layer soil body reach it is certain by force
It is carried out after degree, and is laid with horizontal drainage pipeline, then be successively laid with woven cloth, geotextiles, vacuum diaphragm and be sealed processing.
4. the construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation as described in claim 1, special
Sign is: step (3) carries out classification vacuumize process with long drain bar, alleviates drain bar periphery earth pillar and is formed and in blocking up, divided
Grade vacuum load is 20kPa, 40kPa, 60kPa, 80kPa.
5. the construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation as described in claim 1, special
Sign is: step (4) carries out in the vacuum consolidation later period, starts executive chairman's drain bar according to settlement observation value and vacuumizes and be pressurized friendship
For processing, the alternately time is vacuumized and is pressurized according to the determination for the treatment of region vacuum degree observation, short slab is persistently vacuumized
Processing, vacuum pressure maintain 80kPa or more.
6. the construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation as described in claim 1, special
Sign is: settlement observation and lateral deformation observation is carried out while carrying out step (4), until meeting construction settlement amount or weak soil
Stop Combined Treatment when the design requirement of consolidation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810975126.9A CN109295969A (en) | 2018-08-24 | 2018-08-24 | The construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation |
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| CN201810975126.9A CN109295969A (en) | 2018-08-24 | 2018-08-24 | The construction technology of different length drain bar series turbocharging vacuum pre-pressed soft soil foundation |
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| CN109295969A true CN109295969A (en) | 2019-02-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216143A (en) * | 2021-03-24 | 2021-08-06 | 宁波大学 | Composite pile and construction method thereof |
| CN113605359A (en) * | 2021-08-13 | 2021-11-05 | 中冶集团武汉勘察研究院有限公司 | Multilayer complex soft soil foundation rapid dewatering consolidation construction structure and construction method |
| CN115419045A (en) * | 2022-10-24 | 2022-12-02 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for reinforcing soft soil foundation by combining post-grouting type composite foundation and booster-type vacuum preloading |
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| CN105862712A (en) * | 2016-04-21 | 2016-08-17 | 中交第三航务工程局有限公司江苏分公司 | Method of strengthening non-sand vacuum preloading soft soil foundation |
| CN106223308A (en) * | 2016-08-26 | 2016-12-14 | 上海建工集团股份有限公司 | A kind of vacuum combined water that covers loads pre-pressing system and construction method thereof |
| CN106677158A (en) * | 2017-03-01 | 2017-05-17 | 杭州亿东岩土工程有限公司 | Recent quick uniform treatment method and structure for blown filled muck shallow strata |
| CN107419717A (en) * | 2017-06-19 | 2017-12-01 | 龙元建设集团股份有限公司 | It is pressurized compound vacuum pre-pressed soft soil foundation processing constructing device and technique |
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Patent Citations (4)
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| CN105862712A (en) * | 2016-04-21 | 2016-08-17 | 中交第三航务工程局有限公司江苏分公司 | Method of strengthening non-sand vacuum preloading soft soil foundation |
| CN106223308A (en) * | 2016-08-26 | 2016-12-14 | 上海建工集团股份有限公司 | A kind of vacuum combined water that covers loads pre-pressing system and construction method thereof |
| CN106677158A (en) * | 2017-03-01 | 2017-05-17 | 杭州亿东岩土工程有限公司 | Recent quick uniform treatment method and structure for blown filled muck shallow strata |
| CN107419717A (en) * | 2017-06-19 | 2017-12-01 | 龙元建设集团股份有限公司 | It is pressurized compound vacuum pre-pressed soft soil foundation processing constructing device and technique |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216143A (en) * | 2021-03-24 | 2021-08-06 | 宁波大学 | Composite pile and construction method thereof |
| CN113605359A (en) * | 2021-08-13 | 2021-11-05 | 中冶集团武汉勘察研究院有限公司 | Multilayer complex soft soil foundation rapid dewatering consolidation construction structure and construction method |
| CN113605359B (en) * | 2021-08-13 | 2022-06-21 | 中冶集团武汉勘察研究院有限公司 | Multilayer complex soft soil foundation rapid dewatering consolidation construction structure and construction method |
| CN115419045A (en) * | 2022-10-24 | 2022-12-02 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for reinforcing soft soil foundation by combining post-grouting type composite foundation and booster-type vacuum preloading |
| CN115419045B (en) * | 2022-10-24 | 2023-06-09 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for reinforcing soft soil foundation by post grouting type combined supercharging type vacuum preloading |
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Application publication date: 20190201 |