CN103924579A - Construction method of vacuum pre-pressing foundation processing low-mixing-amount cement-soil mixed sealing wall - Google Patents

Construction method of vacuum pre-pressing foundation processing low-mixing-amount cement-soil mixed sealing wall Download PDF

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Publication number
CN103924579A
CN103924579A CN201410160678.6A CN201410160678A CN103924579A CN 103924579 A CN103924579 A CN 103924579A CN 201410160678 A CN201410160678 A CN 201410160678A CN 103924579 A CN103924579 A CN 103924579A
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China
Prior art keywords
cement
construction
sealing
vacuum
envelope
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Pending
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CN201410160678.6A
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Chinese (zh)
Inventor
罗云峰
吴洁妹
刘加峰
李耀良
邓治纲
李伟
赵欣
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Shanghai Foundation Engineering Group Co Ltd
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Shanghai Foundation Engineering Group Co Ltd
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Priority to CN201410160678.6A priority Critical patent/CN103924579A/en
Publication of CN103924579A publication Critical patent/CN103924579A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a construction method of a vacuum pre-pressing foundation processing low-mixing-amount cement-soil mixed sealing wall. Two rows of double-shaft 700-mm cement-clay mixed piles are adopted for the sealing wall, the overlapping width is 200 mm, the length of the piles is 10 m, the cement mixing amount is five percent, the bentonite mixing amount is 0.8 percent, the Na2CO3 mixing amount is five percent of the weight of the bentonite, and the ratio of water to cement ranges from 1.9 to 2.0. When the sealing wall is constructed, the pile position deviation of the cement-clay mixed piles is smaller than or equal to 50 mm, and the verticality of the cement-clay mixed piles is smaller than one percent. The construction method can effectively solve the problems that sealing performance required by multi-block and high-standard handling of vacuum pre-pressing of a large-area soft soil foundation is poor, and when adjacent blocks of the sealing wall bear two-way seepage, permeation, sinking and fracture are caused easily, and it is guaranteed that the sealing effect of the sealing wall can meet the requirement for vacuum degree under a membrane. Moreover, on the premise that the sealing performance and the vacuum degree requirement are guaranteed, the cement using amount of the mixed piles can further be reduced, and resources and construction cost can be saved.

Description

Soft Ground Improved By Vacuum Preloading is processed the construction method of low-dosage Soil-cement envelope wall
Technical field
The present invention relates to the Soft Ground Improved By Vacuum Preloading processing Soil-cement envelope wall that a kind of building operations is used, especially a kind of large area high request Soft Ground Improved By Vacuum Preloading is processed the construction method of low-dosage Soil-cement envelope wall.
Background technology
The Jie Erman of geological institute of method Shi You Sweden imperial family of vacuum preloading is taught in nineteen fifty-two and proposes, successively on the U.S., Japan and other places, start application, but because sealing problem is at that time failed fine solution, be difficult for obtaining and keeping required vacuum, so this method does not have large scale application.Domesticly at the end of the fifties and the beginning of the sixties, start the laboratory test research to vacuum preloading, but fail to obtain great progress.Until carried out field trial at Tianjinxingang and obtained success for 1980.After the eighties in 20th century, vacuum method starts to be applied to engineering practice gradually.The problem of vacuum preloading sealing is to control an a crucial factor of vacuum preloading effect, the envelope wall adopting at present exists quality controllability not high, be mainly reflected in that each material volume proportioning is too high, cement consumption is large, become the wall uniformity, verticality and the more difficult control of overlap joint, sealing effect is bad, and when carry out large-area soft ground multi-tiling, high standard while processing adjacent block envelope wall bear two-way seepage flow and easily produce infiltration depression problems of crack.Shanghai engineering adopts vacuum preloading technique, ground processing area approximately 1,400,000 m 2, under the special geological environment of China especially For Soft Foundation in Shanghai, build and still belong to the first time.Engineering ground area is large, short its actual engineering time of duration is time one year only, target settling amount is high, and maximum target settling amount reaches 900mm, existing Paleochannel region, construction plant, You You normal sedimentation district is also distributed with a large amount of bright, dark creeks, engineering geological conditions is complicated, and in place, the soft base degree of depth is darker, and superficial part scope exists local pervious layer, in overlarge area like this place, in the so short duration, carry out vacuum preloading construction, strengthening quality is controlled difficulty.Because some defects of existing envelope wall make, vacuum pre-press reinforcing technology is wide at site area, engineering quantity is large, the duration is short, target settling amount also requires the application in some high object of construction production to be restricted.Therefore, be necessary further to explore more effectively large area high request Soft Ground Improved By Vacuum Preloading and process envelope wall technology, significant to consolidation effect and the range of application of raising vacuum preloading.
Summary of the invention
The present invention be to solve large-area soft ground vacuum preloading multi-tiling, high standard processing requirements envelope wall quality controllability is not high, sealing performance is bad and adjacent block envelope wall bears two-way seepage flow and easily produces infiltration depression problems of crack, guarantee that the sealing effectiveness of envelope wall can meet the requirement of vacuum under film, and provide a kind of Soft Ground Improved By Vacuum Preloading to process the construction method of low-dosage Soil-cement envelope wall.
For achieving the above object, technical scheme of the present invention is: a kind of Soft Ground Improved By Vacuum Preloading is processed the construction method of low-dosage Soil-cement envelope wall, be characterized in: envelope wall adopts the cement clay agitation pile of two row's twin shaft 700mm, lap width 200mm, the long 10m of stake, cement mixed weight 5%, swell soil incorporation is 0.8%, Na 2cO 3incorporation is 5% of swell soil weight, and water/binder ratio is 1.9~2.0.
Envelope wall cement mixing content when bright, dark creek changes the section of filling out construction is increased to 6%, and increases stir process one time.During envelope wall construction, the pile position deviation of cement clay agitation pile is less than or equal to 50mm, and verticality is less than 1%.
The invention has the beneficial effects as follows:
(1) the present invention can effectively solve large-area soft ground vacuum preloading multi-tiling, high standard processing requirements envelope wall quality controllability is not high, sealing performance is bad and adjacent block envelope wall bears two-way seepage flow and easily produces infiltration depression problems of crack, guarantees that the sealing effectiveness of envelope wall can meet the requirement of vacuum under film.
(2) the present invention is guaranteeing can also to reduce agitation pile cement consumption under the prerequisite that sealing and vacuum require, and economizes on resources and saves construction cost (traditional agitation pile cement mixing content is more than 10%, and cement mixing pile cement mixing content of the present invention is 5%).
The specific embodiment
Below in conjunction with concrete embodiment, further set forth the present invention.Should be understood that these embodiments are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
A kind of Soft Ground Improved By Vacuum Preloading is processed the construction method of low-dosage Soil-cement envelope wall, specifically comprise: envelope wall adopts the cement clay agitation pile of two row's twin shaft 700mm, lap width 200mm, the long 10m of stake, cement mixed weight 5%, cement is P.C32.5 level portland cement, swell soil incorporation is 0.8%, Na2CO3 incorporation is 5% of swell soil weight, and water/binder ratio (containing swell soil) is 1.9~2.0.Envelope wall cement mixing content when bright, dark creek changes the section of filling out construction is increased to 6%, and increases stir process one time.
Stake machine level during envelope wall construction, mixer is vertical, guarantees stake position accurately, guarantees that stake machine supports firm, requires pile position deviation to be less than or equal to 50mm, and verticality is less than 1%.The quantity that envelope wall material volume is controlled with every barrel of required each material of slurries amount controls, slurries preparation will strictly be undertaken by proportioning, the slurries holding time preparing can not be long, slurries will constantly stir in mortar mixer, until send before slurry, in construction implementation process, the time is stirred in strict control slurry flow and spray.
Application implementation example of the present invention:
Shanghai engineering adopts vacuum preloading technique, ground processing area approximately 1,400,000 m 2under the special geological environment of China especially For Soft Foundation in Shanghai, build and still belong to the first time, engineering is located in typical soft soil areas, Shanghai, engineering ground area is large, short its actual engineering time of duration is time one year only, target settling amount is high, existing Paleochannel region, construction plant, You You normal sedimentation district is also distributed with a large amount of bright, dark creeks, engineering geological conditions is complicated, and in place, the soft base degree of depth is darker, and superficial part scope exists local pervious layer, in overlarge area like this place, in the so short duration, carry out vacuum preloading construction, strengthening quality is controlled difficulty.
By low-dosage Soil-cement envelope wall of the present invention, being applied to this project Soft Ground Improved By Vacuum Preloading processes in construction, under film, vacuum observed result shows, vacuum in large-area construction process guarantees good, from adding that vacuum load started each stabilization zone and reached design load 80kPa in one week, and in consolidation time, the vacuum design load of remaining stabilization zone kept stable.More than the time span that each district vacuumizes has all reached 45d.The degree of consolidation of each stabilization zone has all reached more than 85%, and ground settlement average has all reached the requirement of design object sedimentation value.On-the-spot every data show, each block has all reached designing requirement within the predetermined duration, shows that it is obvious in this engineering, using the effect of Vacuum Preloading Method for Consolidation of Soft Soil Foundation of the present invention.

Claims (3)

1. Soft Ground Improved By Vacuum Preloading is processed a construction method for low-dosage Soil-cement envelope wall, it is characterized in that: envelope wall adopts the cement clay agitation pile of two row's twin shaft 700mm, lap width 200mm, the long 10m of stake, cement mixed weight 5%, swell soil incorporation is 0.8%, Na 2cO 3incorporation is 5% of swell soil weight, and water/binder ratio is 1.9~2.0.
2. Soft Ground Improved By Vacuum Preloading according to claim 1 is processed the construction method of low-dosage Soil-cement envelope wall, it is characterized in that: described envelope wall cement mixing content when bright, dark creek changes the section of filling out construction is increased to 6%, and increases stir process one time.
3. Soft Ground Improved By Vacuum Preloading according to claim 1 is processed the construction method of low-dosage Soil-cement envelope wall, it is characterized in that: during described envelope wall construction, the pile position deviation of cement clay agitation pile is less than or equal to 50mm, and verticality is less than 1%.
CN201410160678.6A 2014-04-22 2014-04-22 Construction method of vacuum pre-pressing foundation processing low-mixing-amount cement-soil mixed sealing wall Pending CN103924579A (en)

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Publication number Priority date Publication date Assignee Title
CN104876489A (en) * 2015-05-15 2015-09-02 中铁十一局集团第四工程有限公司 Cement-bentonite slurry preparation and preparation method thereof
CN104891893A (en) * 2015-05-13 2015-09-09 河海大学 Coastal soft foundation soil solidifying and reinforcing material and application thereof
CN106592572A (en) * 2016-10-21 2017-04-26 温州大学 Air pressure split foundation strengthening treatment structure and method adopting air pressure split foundation strengthening treatment structure

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104891893A (en) * 2015-05-13 2015-09-09 河海大学 Coastal soft foundation soil solidifying and reinforcing material and application thereof
CN104876489A (en) * 2015-05-15 2015-09-02 中铁十一局集团第四工程有限公司 Cement-bentonite slurry preparation and preparation method thereof
CN106592572A (en) * 2016-10-21 2017-04-26 温州大学 Air pressure split foundation strengthening treatment structure and method adopting air pressure split foundation strengthening treatment structure

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