CN103572768A - Cement-mixed pile closed retaining wall foundation structure for tank foundations and treatment method thereof - Google Patents
Cement-mixed pile closed retaining wall foundation structure for tank foundations and treatment method thereof Download PDFInfo
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- CN103572768A CN103572768A CN201210273560.5A CN201210273560A CN103572768A CN 103572768 A CN103572768 A CN 103572768A CN 201210273560 A CN201210273560 A CN 201210273560A CN 103572768 A CN103572768 A CN 103572768A
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Abstract
The invention discloses a cement-mixed pile closed retaining wall foundation structure for tank foundations and a treatment method thereof. The structure comprises a round closed cement retaining wall around a tank foundation and a plurality of geotextile layers. The round closed cement retaining wall is larger than a storage tank in diameter. The multiple geotextile layers are spread between the tank foundation and the cement retaining wall. A plurality of sand-gravel cushions are spread among the geotextile layers. The invention further provides a treatment method based on the cement-mixed pile closed retaining wall foundation structure for tank foundations. The cement-mixed pile closed retaining wall foundation structure for tank foundations and the treatment method thereof have the advantages that on one hand, the soil mass under treatment can be partly limited, and lateral deformation of the soil mass is reduced; on the other hand, the closed continuous cement-mixed pile retaining wall can prevent pore water in the soil mass under treatment from permeating out and dispersing and can form a water separation curtain, so that consolidation settlement of soft soil is reduced.
Description
Technical field
The present invention relates to a kind of tank foundation cement mixing pile sealing barricade foundation structure and processing method thereof.
Background technology
Storage tank is a kind of use special equipment very widely, and the annual big or small storage tank of building of China is not known its number, and wherein major part concentrates on again on soft soil along the coast, needs scope to be processed very large.And build storage tank on soft foundation, conventionally need to carry out ground processing, could meet intensity, stable and settlement request.Existing processing method take discharging consolidation as main combination granular pile form compound foundation the most conventional, as preloading (or water-filling, vacuum preloading) preloading, broken (sand) stone mar method etc., also have with the method for mixing cement and soil into pile, CFG stake methods (being cement, flyash Sand Pile Method) etc. are considered the single compound foundation method of pile soil common action, also have and on the basis in conjunction with these methods, amplify out the method that employing forced-ventilated water adds low-energy strong-ramming.
Engineering properties from soft foundation, its intensity, compressibilty and infiltration consolidation characteristics are to affect saturated soft soil as the principal element of engineering foundation condition, its core is the dissipation problem of excess pore water pressure in the soil body, thereby conventional method for processing foundation is started with from two aspects conventionally invariably: (1) soil fixed; Fixed with native permeability is relevant, also relevant with drainage pattern.(2) the direct improvement of the soil body; Adopt the modes such as displacement or chemosetting, directly change native engineering properties.
Existing these method for processing foundation meet in theory in soft foundation at working mechanism in a large amount of engineering practices.But engineering practice also shows, these processing methods often require to exist certain difference with design object on treatment effect.Main cause is that the effect that ground is processed is limited by the quality of construction quality on the one hand to a great extent, the theoretical research that is on the other hand Soft Soil-composite Foundation falls behind and engineering practice, to each of weak soil to fixed (comprising secondary consolidation) characteristic, each is to Percolation Law, and some row mechanism problem such as thixotroping recovery make clear not yet completely, thus the design object value of processing scheme often determine unreasonable.Many treated tank foundations are after work in the long duration, and sedimentation is convergence not yet in effect still.
Summary of the invention
The technical problem to be solved in the present invention be in order to overcome its treatment effect of prior art soft-soil foundation treatment method, be subject to that construction quality affects greatly, the theoretical imperfection of Soft Soil-composite Foundation, defect that settlement after construction is large, a kind of distortion that can reduce the soil body is provided, prevents tank foundation cement mixing pile sealing barricade foundation structure and processing method thereof that the pore water in the processed soil body dissipates to exosmosis.
The present invention solves above-mentioned technical problem by following technical proposals: a kind of tank foundation cement mixing pile sealing barricade foundation structure, and its feature is, it comprises:
The round sealed cement barricade that one excircle along described tank foundation is arranged, the diameter of described cement barricade is greater than the diameter of described storage tank;
One is layed in some layers of geotextiles between described tank foundation and described cement barricade, between every layer of described geotextiles, is equipped with some sand-gravel cushions.
Preferably, described cement barricade is to be formed by continuous cement mixing pile.
Preferably, the degree of depth of described cement barricade enters the impervious layer under the processed soil body.
Preferably, described cement mixing pile adopts biaxial rneader pile.
Preferably, the section of described cement mixing pile is the figure of eight.
Preferably, the section of described cement barricade is continuous overlapping or the cement mixing pile barricade section of grid type.
Preferably, the covering diameter of described some layers of geotextiles is greater than the diameter of described cement barricade.
Preferably, described storage tank is a steel tank or a reinforced concrete storage.
The present invention also provides the processing method of a kind of tank foundation cement mixing pile sealing barricade ground, and its feature is, it comprises the following steps:
S
1, along the excircle of tank foundation, arrange round sealed cement barricade, the diameter of described cement barricade is greater than described tank diameter;
S
2, described cement barricade section adopt the cement mixing pile section of continuous overlapping or grid type;
S
3, between described tank foundation and described cement barricade, lay some layers of geotextiles;
S
4, the described cement barricade degree of depth enters the impervious layer under the processed soil body;
S
5, be also equipped with some sand-gravel cushions between every layer of described geotextiles.
Preferably, described cement barricade is to be formed by continuous cement mixing pile.
Preferably, described cement mixing pile adopts biaxial rneader pile, and the section of described cement mixing pile is the figure of eight.
Preferably, step S
3in the covering diameter scope of described geotextiles be greater than the diameter of described cement barricade.
Preferably, described storage tank is a steel tank or a reinforced concrete storage.
In the present invention, above-mentioned additional technical feature or optimum condition can be combined on the basis that meets this area general knowledge, obtain each preferred embodiment of the present invention.
Positive progressive effect of the present invention is: the present invention adopts tank foundation cement mixing pile sealing barricade foundation structure, can realize the indirect processing to soft foundation under tank base scope, and do not destroy, not disturbance is reinforced the foundation soil body in scope, does not affect soil body characteristic in processing procedure.In addition, processing method of the present invention has also overcome that its treatment effect of existing soft-soil foundation treatment method is subject to that construction quality affects greatly, the theoretical imperfection of Soft Soil-composite Foundation, defect that settlement after construction is large, can effectively reduce foundation settlement, improve native supporting capacity and shear resistance, coordinate the mutual differential deformation of the soil body.
Accompanying drawing explanation
Fig. 1 is the foundation structure top view of a preferred embodiment of the present invention.
Fig. 2 is along I-I line view in Fig. 1.
Fig. 3 is the profile of the lap connection formula cement mixing pile barricade of a preferred embodiment of the present invention.
Fig. 4 is the profile of the continuous grid type cement mixing pile barricade of another preferred embodiment of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, provide preferred embodiment of the present invention, to describe technical scheme of the present invention in detail.
As shown in Figures 1 to 4, tank foundation cement mixing pile sealing barricade foundation structure provided by the invention, be take to being reinforced not the destroying of the soil body under basic scope, not disturbance is prerequisite, and in whole processing procedure, do not affect that soil body characteristic builds, this foundation structure comprises the round sealed cement barricade 2 that an excircle along tank foundation 1 is arranged, between tank foundation 1 and cement barricade 2, lay some layers of geotextiles 3, between every layer of geotextiles 3, be equipped with some sand-gravel cushions.Wherein geotextiles is ground paver well known in the art.
The sedimentation producing in order to prevent the side direction infiltration of water in soil, the diameter of cement barricade 2 is greater than the diameter of storage tank 4; The covering diameter of some layers of geotextiles 3 is greater than the diameter of cement barricade 2.
In order to guarantee the impermeable role of cement barricade 2, the degree of depth of cement barricade 2 should enter the impervious layer under the processed soil body.
As shown in Figure 3 and Figure 4, the section of cement barricade 2 of the present invention can be the cement mixing pile barricade section of continuous overlapping or grid type.
The core of foundation structure of the present invention is to adopt continuous cement mixing pile to form barricade sealing to need the soil body in process range, play on the one hand the effect to processed soil body forming section side limit, reduce the lateral deformation of the soil body, the continuous cement mixing pile barricade sealing on the other hand can play again the pore water preventing in the processed soil body and dissipate to exosmosis, form water seal curtain, thereby reduce consolidation settlement.Meanwhile, on the surface of the processed soil body, adopt the method for laying geotextiles, to improve native supporting capacity and shear resistance, coordinate the mutual differential deformation of the soil body.As a kind of embodiment, the present invention is particularly useful for steel tank, or the ground of reinforced concrete storage is processed.
Foundation structure based on above-mentioned, the present invention also provides a kind of tank foundation cement mixing pile sealing barricade method for processing foundation.The formation of this method is in the outside along tank foundation circumference, adopt cement mixing pile to construct the circular barricade of sealing continuously, and to being reinforced foundation soil body surface, lay geotextiles in round sealed barricade, do not destroy, not disturbance, do not change the existing characteristic that is reinforced the soil body under tank base.The present invention has overcome that its treatment effect of existing soft-soil foundation treatment method is subject to that construction quality affects greatly, the theoretical imperfection of Soft Soil-composite Foundation, defect that settlement after construction is large, can effectively reduce foundation settlement, improve supporting capacity and the shear resistance of the soil body, coordinate the mutual differential deformation of the soil body.
As shown in Figures 1 to 4, concrete processing method is as follows:
(1), along the excircle of tank foundation 1, arrange continuous cement mixing pile 5, form the cement barricade 2 of round sealed; The diameter of cement barricade 2 is greater than the diameter of storage tank 4;
(2), cement mixing pile 5 adopts biaxial rneader piles, section is the figure of eight, stake and stake must lap connections;
(3), cement barricade 2 width and the degree of depth are according to theoretical calculative determination; Such as, can determine according to ground soil characteristics.This part is those skilled in the art's common practise, and therefore not to repeat here.
(4), the section of cement barricade 2 can adopt the cement mixing pile 5 of continuous overlapping or various grid types.The cement mixing pile of this lap connection formula or grid type can directly utilize existing concrete stake job practices in prior art to make.
(5), the degree of depth of cement barricade 2 should enter the impervious layer under the processed soil body;
(6), on the surface of the processed soil body, adopt and lay multilayer geotextiles 3, preferably, the covering diameter scope of geotextiles 3 is greater than the diameter of cement mixing pile round sealed barricade.Between every layer of geotextiles, lay sand-gravel cushion, can improve native supporting capacity like this.
(7), the laying number of plies of geotextiles is by calculative determination; Such as, can be according to the supporting capacity of ground and deformability, and the load level of the building on ground determines it is to adopt two layers or three layers or more multi-layered.This calculating section is prior art, and therefore not to repeat here.
Tank foundation cement mixing pile sealing barricade method for processing foundation of the present invention has been constructed a kind of indirectly method for designing of passing through, the ground treatment construction skill of realization to need target foundation soil to be processed, can be used for being built in the ground processing of the base of steel tank on normal consolidation soft foundation, be particularly useful for steel tank, the Soft Ground of reinforced concrete storage.
Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is limited by appended claims.Those skilled in the art is not deviating under the prerequisite of principle of the present invention and essence, can make various changes or modifications to these embodiments, but these changes and modification all fall into protection scope of the present invention.
Claims (13)
1. a tank foundation cement mixing pile sealing barricade foundation structure, is characterized in that, it comprises:
The round sealed cement barricade that one excircle along described tank foundation is arranged, the diameter of described cement barricade is greater than the diameter of described storage tank;
One is layed in some layers of geotextiles between described tank foundation and described cement barricade, between every layer of described geotextiles, is equipped with some sand-gravel cushions.
2. tank foundation cement mixing pile sealing barricade foundation structure as claimed in claim 1, is characterized in that, described cement barricade is to be formed by continuous cement mixing pile.
3. tank foundation cement mixing pile sealing barricade foundation structure as claimed in claim 2, is characterized in that, the degree of depth of described cement barricade enters the impervious layer under the processed soil body.
4. tank foundation cement mixing pile sealing barricade foundation structure as claimed in claim 3, is characterized in that, described cement mixing pile adopts biaxial rneader pile.
5. tank foundation cement mixing pile sealing barricade foundation structure as claimed in claim 4, is characterized in that, the section of described cement mixing pile is the figure of eight.
6. tank foundation cement mixing pile sealing barricade foundation structure as claimed in claim 2, is characterized in that, the section of described cement barricade is continuous overlapping or the cement mixing pile barricade section of grid type.
7. tank foundation cement mixing pile sealing barricade foundation structure as claimed in claim 1, is characterized in that, the covering diameter of described some layers of geotextiles is greater than the diameter of described cement barricade.
8. tank foundation cement mixing pile seals barricade foundation structure as claimed in any of claims 1 to 7 in one of claims, it is characterized in that, described storage tank is a steel tank or a reinforced concrete storage.
9. a processing method for tank foundation cement mixing pile sealing barricade ground, is characterized in that, it comprises the following steps:
S
1, along the excircle of tank foundation, arrange round sealed cement barricade, the diameter of described cement barricade is greater than described tank diameter;
S
2, described cement barricade section adopt the cement mixing pile section of continuous overlapping or grid type;
S
3, between described tank foundation and described cement barricade, lay some layers of geotextiles;
S
4, the described cement barricade degree of depth enters the impervious layer under the processed soil body;
S
5, be also equipped with some sand-gravel cushions between every layer of described geotextiles.
10. tank foundation cement mixing pile sealing barricade method for processing foundation as claimed in claim 9, is characterized in that, described cement barricade is to be formed by continuous cement mixing pile.
11. tank foundation cement mixing pile sealing barricade method for processing foundation as claimed in claim 10, is characterized in that, described cement mixing pile adopts biaxial rneader pile, and the section of described cement mixing pile is the figure of eight.
12. tank foundation cement mixing pile as described in any one in claim 9 to 11 sealing barricade method for processing foundation, is characterized in that step S
3in the covering diameter scope of described geotextiles be greater than the diameter of described cement barricade.
13. tank foundation cement mixing pile sealing barricade method for processing foundation as claimed in claim 9, is characterized in that, described storage tank is a steel tank or a reinforced concrete storage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210273560.5A CN103572768B (en) | 2012-08-02 | 2012-08-02 | Cement-mixed pile closed retaining wall foundation structure for tank foundations and treatment method thereof |
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| CN201210273560.5A CN103572768B (en) | 2012-08-02 | 2012-08-02 | Cement-mixed pile closed retaining wall foundation structure for tank foundations and treatment method thereof |
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| CN103572768A true CN103572768A (en) | 2014-02-12 |
| CN103572768B CN103572768B (en) | 2015-07-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61261526A (en) * | 1985-05-15 | 1986-11-19 | Hitachi Ltd | Foundation structure for vertical type open tank |
| JPS62215728A (en) * | 1986-03-14 | 1987-09-22 | Toa Nenryo Kogyo Kk | Foundation structure of tank |
| CN100591865C (en) * | 2008-08-08 | 2010-02-24 | 江苏华东建设基础工程有限公司 | Construction method of socket water stop curtain for dual spindle soil-cement stirring mill |
| CN101793024A (en) * | 2010-03-31 | 2010-08-04 | 中交二航局第三工程有限公司 | Construction method for multi-head small-diameter deep mixing and high-pressure jet combined anti-seepage wall of foundation pit |
| CN102337748A (en) * | 2011-06-17 | 2012-02-01 | 中国石油天然气集团公司 | Two-layer manual liner anti-seepage structure for storage tank foundation and construction method for two-layer manual liner anti-seepage structure |
-
2012
- 2012-08-02 CN CN201210273560.5A patent/CN103572768B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61261526A (en) * | 1985-05-15 | 1986-11-19 | Hitachi Ltd | Foundation structure for vertical type open tank |
| JPS62215728A (en) * | 1986-03-14 | 1987-09-22 | Toa Nenryo Kogyo Kk | Foundation structure of tank |
| CN100591865C (en) * | 2008-08-08 | 2010-02-24 | 江苏华东建设基础工程有限公司 | Construction method of socket water stop curtain for dual spindle soil-cement stirring mill |
| CN101793024A (en) * | 2010-03-31 | 2010-08-04 | 中交二航局第三工程有限公司 | Construction method for multi-head small-diameter deep mixing and high-pressure jet combined anti-seepage wall of foundation pit |
| CN102337748A (en) * | 2011-06-17 | 2012-02-01 | 中国石油天然气集团公司 | Two-layer manual liner anti-seepage structure for storage tank foundation and construction method for two-layer manual liner anti-seepage structure |
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