CN101514549A - Method using intermediate mixing piles for treating three-layer soft foundation - Google Patents
Method using intermediate mixing piles for treating three-layer soft foundation Download PDFInfo
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- CN101514549A CN101514549A CNA2009100261087A CN200910026108A CN101514549A CN 101514549 A CN101514549 A CN 101514549A CN A2009100261087 A CNA2009100261087 A CN A2009100261087A CN 200910026108 A CN200910026108 A CN 200910026108A CN 101514549 A CN101514549 A CN 101514549A
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Abstract
The invention discloses a method using intermediate mixing piles for treating a three-layer soft foundation. The method is characterized in that the intermediate mixing piles are arranged on the three-layer soft foundation with the upper part and the lower part being medium-compressibility soil and the middle part being a soft soil layer, wherein, the intermediate mixing pile consists of an upper small pile and a lower small pile with smaller diameters, and a middle expansion head with larger diameter; the upper and the lower small piles are arranged in the medium-compressibility soil at the upper part and the lower part of the soft foundation; and the middle expansion head is arranged in the soft soil layer in the middle of the soft foundation. A composite foundation with two replacement ratios is formed by the intermediate mixing piles through the diameter variation of the pile body, particularly, the pile body with higher replacement ratio is arranged in the soft soil layer at the middle part with poor engineering mechanical properties, and the pile body with lower replacement ratio is arranged in the hard soil layer at the upper part and the lower part with good engineering mechanical properties, thereby carrying out targeted treatment on different soil layers of the three-layer soft foundation and achieving the purpose of saving the engineering cost.
Description
Technical field
The invention belongs to technical field of civil engineering, is that a kind of top, bottom of being applicable to is that middle compression soil, centre are the processing method of the three-layer soft foundation of weak soil layer, relates in particular to the method for shape agitation pile processing three-layer soft foundation in a kind of the use.
Background technology
Cement mixing method is one of effective ways of reinforcing soft ground, it is to utilize cement as curing compound, by the deep mixer tool while creeping in the weak soil jet cement slurries or cement flour, and on the spot weak soil and curing compound are forced to stir, by the physics chemical action between curing compound and the weak soil, form that intensity is higher, globality, cement-soil cylinder that water stability is good.At present, the cement mixing method of using on the engineering mostly is the uniform section agitation pile greatly, and promptly the pile body diameter of single pile is identical.The individual layer weak soil is proper relatively uniformly for clay distribution for the uniform section agitation pile, wherein the pile body replacement ratio is one of mixing pile composite foundation main design contents, and the weak soil character that generally is reinforced is poor more, and it is high more that replacement ratio is got, weak soil character is good more, and it is low more that replacement ratio is got.But for the multilayer soft foundation that stratification distributes, adopt traditional uniform section agitation pile to mean that promptly the different multistrata foundation of soil mass property selects identical pile body replacement ratio for use, from the reinforcement mechanism of composite foundation, this is inappropriate.
Reason owing to historical accumulation, the three-layer soft foundation that exists the weak soil layer to mediate in China many local (as the areas, Xuzhou), top is medium or low compressibility is native, the centre is the weak soil layer of high-compressibility, bottom middle compression soil, and the bottom is only the bearing stratum of low compressibility.When reinforcing this three-layer soft foundation with cement mixing method, the soil layer of top, bottom, only need the low pile body rate of putting to put, and middle high-compressibility soil layer needs higher pile body replacement ratio, if adopt traditional uniform section cement mixing method, because middle weak soil is main compression layer, whole stabilization zone must adopt higher pile body replacement ratio, certainly will cause the engineering waste.
The present invention is directed to the weak soil layer and be positioned at middle three-layer soft foundation, proposed the method for the middle shape agitation pile processing of central pile body section expansion.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of top, bottom of being used for is the method that the use shape agitation pile of middle compression soil, middle three-layer soft foundation for the weak soil layer is handled, the present invention can improve the Measures for Making Ground and Foundation effect, thereby reduces processing cost.
Technical scheme: the shape agitation pile is handled the method for three-layer soft foundation in a kind of use:
Be chosen in top, bottom and be middle compression soil, middlely be shape agitation pile in arranging on the three-layer soft foundation of weak soil layer, the shape agitation pile is made up of the bigger middle part enlarged footing of diameter small upper, bottom paxilla and diameter in described, the paxilla of top, bottom is arranged in the middle compression soil layer of top, bottom, in the weak soil layer in the middle of the middle part enlarged footing is arranged at.
Middle shape agitation pile is crossed the pile body diameter variation, formation has the composite foundation of 2 kinds of replacement ratios, in the relatively poor weak soil layer of middle engineering mechanics property, adopt higher pile body replacement ratio, adopt lower pile body replacement ratio in the hardpan preferably in top, bottom engineering mechanics property, different soil in the three-layer soft foundation is handled pointedly, reached the purpose of saving construction costs.
Compared with prior art, the present invention can save 20～30% foundation treatment engineering cost under the prerequisite that reaches the same treatment effect.
Description of drawings
Fig. 1 is the sectional drawing that middle shape agitation pile is handled three-layer soft foundation.
Fig. 2 is the single pile construction flow chart of middle shape agitation pile.
Wherein have: hardpan 1; Weak soil layer 2; Paxilla 3; Enlarged footing 4; Stirring vane 5.
The specific embodiment
Embodiment 1
The shape agitation pile is handled the method for three-layer soft foundation in a kind of the use:
Be chosen in top, bottom and be the middle compression soil layer, middlely be shape agitation pile in arranging on the three-layer soft foundation of weak soil layer, the shape agitation pile is made up of the bigger middle part enlarged footing of diameter small upper, bottom paxilla and diameter in described, the paxilla of top, bottom is arranged in the middle compression soil layer of top, bottom, in the weak soil layer in the middle of the middle part enlarged footing is arranged at.
In the present embodiment,
In the shape agitation pile adopt quincunx lay out pile or square lays out pile, and adopt blade extension type mixing pile machine pile.
Present embodiment with scalable be the stirring vane construction pile of 2 kinds of different-diameters, in hardpan, stirring vane is punctured into the paxilla diameter, stirs with the blade of paxilla diameter; In the weak soil layer, stirring vane is stretched to the enlarged footing diameter, stirs with the blade of enlarged footing diameter.Its construction sequence is specific as follows:
A, mixing pile machine are in place, mixing pile machine drill bit stake position;
B, start mixing pile machine, stirring vane is punctured into the paxilla diameter, and mixing pile machine sinks, and stirs simultaneously and sprays curing compound, arrives hardpan bottom surface, top design elevation up to stirring vane;
C, stirring vane are stretched to the enlarged footing diameter, and mixing pile machine sinks, and stir simultaneously and spray curing compound, weak soil layer bottom surface design elevation in the middle of stirring vane arrives;
D, stirring vane keep the enlarged footing diameter, and mixing pile machine promotes, and stir simultaneously and spray curing compound, arrive hardpan bottom surface, top design elevation up to stirring vane;
E, stirring vane keep the enlarged footing diameter, and mixing pile machine sinks, and stir simultaneously and spray curing compound, arrive weak soil layer bottom surface design elevation up to stirring vane;
F, stirring vane are punctured into the paxilla diameter, and mixing pile machine sinks, and stir simultaneously and spray curing compound, arrive hardpan bottom surface, bottom design elevation up to stirring vane;
G, stop to spray curing compound, stirring vane keeps the paxilla diameter, and mixing pile machine promotes simultaneously and stirs, weak soil layer bottom surface design elevation in the middle of stirring vane arrives;
H, stirring vane are stretched to the enlarged footing diameter, and mixing pile machine promotes simultaneously and stirs, and reaches hardpan bottom surface, top absolute altitude up to stirring vane;
I, stirring vane are punctured into the paxilla diameter, and mixing pile machine promotes simultaneously and stirs, and arrive the face of land or more than the design elevation 0.5 meter up to stirring vane, finish the single pile construction.
The present invention selects a test site, this test site is that top, bottom are that middle compression soil layer, centre are the three-layer soft foundation of weak soil layer, top 3.5m is the hardpan of middle compression, and 3.5m～7.5m is the weak soil layer, and 7.5m～13m is the hardpan of middle compression.The paxilla diameter of the middle shape agitation pile of site operation is 0.5m, and the enlarged footing diameter is 0.9m, and the diameter of enlarged footing and the diameter ratio of paxilla are 1.8, the little pile length in top is 3.5m, middle part enlarged footing diameter is 4.0m, and the little pile length in bottom is 5.5m, and middle shape mixing pile composite foundation pile spacing is 1.8m.The agitation pile curing compound is a cement paste, and cement mixed weight is 13%, and the water/binder ratio of cement paste is 0.57.
Unit volume curing agent ratio in order to ensure enlarged footing and paxilla is consistent substantially, when the variable cross-section mixing pile construction, should adjust sinking, the hoisting velocity of mixing pile machine, the number of times and the speed of injection curing compound.
In described top, bottom is middle compression soil layer, middle in the three-layer soft foundation of weak soil layer, and the soil body void ratio of middle weak soil layer is greater than 1, compression coefficient a
1-2Greater than 0.5MPa
-1, modulus of compressibility E
1-2Less than 3MPa, undrained shear strength c
uLess than 30kPa.The soil body void ratio of top, bottom hardpan is less than 1, compression coefficient a
1-2Less than 0.4MPa
-1, modulus of compressibility E
1-2Greater than 6MPa, undrained shear strength c
uGreater than 60kPa.
The place is shown clearly, carries out stake position setting-out according to design drawing, and mixer sinking and hoisting velocity are 0.8 meter/minute during the paxilla construction, and mixer sinking and hoisting velocity are 0.6 meter/minute during the enlarged footing construction.Whitewashing speed remains unchanged during construction, and spray pressure is 0.3MPa, and paxilla sprays 1 cement paste, and enlarged footing sprays 3 cement pastes.The following (see figure 2) of single pile job practices of concrete middle shape agitation pile:
A, mixing pile machine are in place, mixing pile machine drill bit stake position;
B, start mixing pile machine, stirring vane is punctured into the paxilla diameter, and mixing pile machine sinks, and stirs simultaneously and sprays curing compound, arrives hardpan bottom surface, top design elevation up to stirring vane;
C, stirring vane are stretched to the enlarged footing diameter, and mixing pile machine sinks, and stir simultaneously and spray curing compound, weak soil layer bottom surface design elevation in the middle of stirring vane arrives;
D, stirring vane keep the enlarged footing diameter, and mixing pile machine promotes, and stir simultaneously and spray curing compound, arrive hardpan bottom surface, top design elevation up to stirring vane;
E, stirring vane keep the enlarged footing diameter, and mixing pile machine sinks, and stir simultaneously and spray curing compound, arrive weak soil layer bottom surface design elevation up to stirring vane;
F, stirring vane are punctured into the paxilla diameter, and mixing pile machine sinks, and stir simultaneously and spray curing compound, arrive hardpan bottom surface, bottom design elevation up to stirring vane;
G, stop to spray curing compound, stirring vane keeps the paxilla diameter, and mixing pile machine promotes simultaneously and stirs, weak soil layer bottom surface design elevation in the middle of stirring vane arrives;
H, stirring vane are stretched to the enlarged footing diameter, and mixing pile machine promotes simultaneously and stirs, and reaches hardpan bottom surface, top absolute altitude up to stirring vane;
I, stirring vane are punctured into the paxilla diameter, and mixing pile machine promotes simultaneously and stirs, and arrive the face of land or more than the design elevation 0.5 meter up to stirring vane, finish the single pile construction.
Finish other single pile constructions in the place according to above a～i step.
On-the-spot excavation and get that core, mark are used to test and the result of the laboratory test research of core shows: middle shape cement-soil stirs upper, middle, and lower part can be combined into a complete integral body, and pile body is complete even.Near the test site, set up conventional agitation pile processing section, 0.5 meter in stake footpath, stake is long 13 meters, 1.4 meters of pile spacings, cement mixed ratio is 13%, water/binder ratio is 0.57, middle shape agitation pile processing section is identical with the engineering geological conditions of conventional agitation pile processing section, the mixing pile construction of two processing sections finished after 1 month, filled 4 meters high banketing in the above respectively, carried out ground settlement observation simultaneously, during settlement stability in the sedimentation value of shape agitation pile processing section be 83mm, the sedimentation of conventional agitation pile processing section is 95mm, and the treatment effect of shape agitation pile was identical substantially with conventional agitation pile during this showed.But under the situation that processing area equates, middle shape agitation pile has been saved 25.4% cement consumption than conventional agitation pile.
Claims (5)
1, the method for shape agitation pile processing three-layer soft foundation in a kind of the use, its feature is as follows:
Be chosen in top, bottom and be the middle compression soil layer, middlely be shape agitation pile in arranging on the three-layer soft foundation of weak soil layer, the shape agitation pile is made up of the bigger middle part enlarged footing of diameter small upper, bottom paxilla and diameter in described, the paxilla of top, bottom is arranged in the middle compression soil layer of top, bottom, in the weak soil layer in the middle of the middle part enlarged footing is arranged at.
2, the shape agitation pile is handled the method for three-layer soft foundation in the use according to claim 1, and the shape agitation pile adopts quincunx lay out pile or square lays out pile in it is characterized in that.
3, the method for shape agitation pile processing three-layer soft foundation in the use according to claim 1 is characterized in that adopting blade extension type mixing pile machine pile.
4, the method for shape agitation pile processing three-layer soft foundation in the use according to claim 1, it is characterized in that described in the job practices of shape agitation pile be: with scalable be the stirring vane of the 2 kinds of different-diameters pile of constructing, in hardpan, stirring vane is punctured into the paxilla diameter, stirs with the blade of paxilla diameter; In the weak soil layer, stirring vane is stretched to the enlarged footing diameter, stirs with the blade of enlarged footing diameter.
5, the method for shape agitation pile processing three-layer soft foundation in the use according to claim 1 is characterized in that the job practices of described middle shape agitation pile is:
A, mixing pile machine are in place, mixing pile machine drill bit stake position;
B, start mixing pile machine, stirring vane is punctured into the paxilla diameter, and mixing pile machine sinks, and stirs simultaneously and sprays curing compound, arrives hardpan bottom surface, top design elevation up to stirring vane;
C, stirring vane are stretched to the enlarged footing diameter, and mixing pile machine sinks, and stir simultaneously and spray curing compound, weak soil layer bottom surface design elevation in the middle of stirring vane arrives;
D, stirring vane keep the enlarged footing diameter, and mixing pile machine promotes, and stir simultaneously and spray curing compound, arrive hardpan bottom surface, top design elevation up to stirring vane;
E, stirring vane keep the enlarged footing diameter, and mixing pile machine sinks, and stir simultaneously and spray curing compound, arrive weak soil layer bottom surface design elevation up to stirring vane;
F, stirring vane are punctured into the paxilla diameter, and mixing pile machine sinks, and stir simultaneously and spray curing compound, arrive hardpan bottom surface, bottom design elevation up to stirring vane;
G, stop to spray curing compound, stirring vane keeps the paxilla diameter, and mixing pile machine promotes simultaneously and stirs, weak soil layer bottom surface design elevation in the middle of stirring vane arrives;
H, stirring vane are stretched to the enlarged footing diameter, and mixing pile machine promotes simultaneously and stirs, and reaches hardpan bottom surface, top absolute altitude up to stirring vane;
I, stirring vane are punctured into the paxilla diameter, and mixing pile machine promotes simultaneously and stirs, and arrive the face of land or more than the design elevation 0.5 meter up to stirring vane, finish the single pile construction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100261087A CN101514549B (en) | 2009-04-01 | 2009-04-01 | Method using intermediate mixing piles for treating three-layer soft foundation |
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| CN2009100261087A CN101514549B (en) | 2009-04-01 | 2009-04-01 | Method using intermediate mixing piles for treating three-layer soft foundation |
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| CN101514549B CN101514549B (en) | 2011-05-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922149A (en) * | 2010-08-20 | 2010-12-22 | 徐守田 | Construction method and construction equipment for one-step molded hole digging pile protecting wall |
| CN103774644A (en) * | 2014-01-13 | 2014-05-07 | 东南大学 | Construction method for drainage cement mixing pile |
| CN108487270A (en) * | 2018-06-15 | 2018-09-04 | 华东交通大学 | A kind of friction pile and construction method |
| CN110080286A (en) * | 2019-04-23 | 2019-08-02 | 广东省交通规划设计研究院股份有限公司 | Supporting construction |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1029488C (en) * | 1994-04-01 | 1995-08-09 | 张俊生 | Composite treatment for foundation and piles |
| CN100336982C (en) * | 2004-12-23 | 2007-09-12 | 东南大学 | Nail type cement soil stirring pile operation method |
| CN1274912C (en) * | 2004-12-23 | 2006-09-13 | 东南大学 | Pile forming operation method for bi-directional stirring piles |
-
2009
- 2009-04-01 CN CN2009100261087A patent/CN101514549B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922149A (en) * | 2010-08-20 | 2010-12-22 | 徐守田 | Construction method and construction equipment for one-step molded hole digging pile protecting wall |
| CN101922149B (en) * | 2010-08-20 | 2011-09-07 | 徐守田 | Construction method and construction equipment for one-step molded hole digging pile protecting wall |
| CN103774644A (en) * | 2014-01-13 | 2014-05-07 | 东南大学 | Construction method for drainage cement mixing pile |
| CN103774644B (en) * | 2014-01-13 | 2015-08-26 | 东南大学 | A kind of construction method of drainage cement mixing method |
| CN108487270A (en) * | 2018-06-15 | 2018-09-04 | 华东交通大学 | A kind of friction pile and construction method |
| CN110080286A (en) * | 2019-04-23 | 2019-08-02 | 广东省交通规划设计研究院股份有限公司 | Supporting construction |
| CN110080286B (en) * | 2019-04-23 | 2022-04-19 | 广东省交通规划设计研究院集团股份有限公司 | Supporting structure |
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