CN103321204B - Be applicable to the processing method of the deep soft soil foundation of storage building ground floor - Google Patents
Be applicable to the processing method of the deep soft soil foundation of storage building ground floor Download PDFInfo
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- CN103321204B CN103321204B CN201310199209.0A CN201310199209A CN103321204B CN 103321204 B CN103321204 B CN 103321204B CN 201310199209 A CN201310199209 A CN 201310199209A CN 103321204 B CN103321204 B CN 103321204B
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Abstract
The present invention relates to the processing method being applicable to the deep soft soil foundation of storage building ground floor, comprise the following steps: (1) is treated Ground Treatment place and carried out smooth process; (2) according to reinforcement depth and the soil condition in place, some draining shafts are set; (3) squeeze into grouting pipe in draining shaft inside, carry out injecting treatment from bottom to top, forming reinforced cement earth sand pile, after slip casting completes, without the need to extracting grouting pipe, namely completing the process to ground.Compared with prior art, the present invention is that the Soft Ground of logistic storage building ground floor provides new practical approach, actual affected simple, and economic and technical norms have obvious advantage.
Description
Technical field
The invention belongs to civil engineering, particularly field of foundation treatment, especially relates to a kind of processing method being applicable to the deep soft soil foundation of storage building ground floor, effectively can improve the settlement issues of load-carrying capacity of soft soil foundation and minimizing ground, this invention is simple, economical reliable.Patent dependent territory wood engineering of the present invention particularly field of foundation treatment, object is to design a kind of processing method being applicable to the deep soft soil foundation of storage building ground floor, effectively can improve the settlement issues of deep soft soil foundation bearing capacity and minimizing ground.
Background technology
As the important component part of modern logistics industry, China's warehousing industry faces the vigorous market demand, especially in the deep Soft Soil Districts of riverine and coastal, especially in fast development.Logistic storage has particular/special requirement for building ground floor, and demand fulfillment Multi-layer storage rack ground under full load condition has good planeness, otherwise may cause the inclination of storing goods shelf or the fluctuation of service of dispensing goods fork truck.Therefore, the deep soft soil foundation process of logistic storage building ground floor is extremely important.
Deep soft soil foundation processing method at present for large area logistic storage building ground floor mainly contains: preloading, mixing pile composite foundation method, heavy tamping replacement method etc.See with regard to present circumstances, often kind of a method has pluses and minuses, and preloading mainly contains preloading, vacuum method and Vacuum-Surcharge Preloading Method etc.Preloading can effective soft soil foundation settlement issues, but adopts piling prepressing on duration and cost, all do not reach the economy of storage site requirements and efficient requirement for large-area storage place; Vacuum method consolidation effect is limited by the restriction of vacuum preloading load, can not meet some storage facilities for the higher requirement of bearing capacity.Cement mixing pile composite foundation reinforcing soft soil successful, the construction period is short, but costly and construction quality be difficult to control.When heavy tamping replacement method is applied to high saturated soft soil foundation, Deformation control often reaches the requirement less than logistic storage building ground floor.Therefore, at the Yangtze River Delta, area, Pearl River Delta and the deep soft soil layer of other region following the line of the sea extensive development of China, demand economical rationality, the soft-soil foundation treatment method of quick construction is the technical barrier that restriction logistic storage building ground floor is built.
Current storage terrace, generally with gently ramming in conjunction with precipitation, within treating depth 4 meters, has very large limitation.Effectively can break through to this method this limitation.Based on storage building ground floor to the feature of foundation strength and deformation requirements, this building ground floor has higher requirement to inhomogeneous deformation.The present invention proposes the feature in conjunction with multiple basement process means, adopt according to terrace load and foundation condition and draining shaft acceleration rate of consolidation is set, after meeting degree of consolidation designing requirement, the processing mode that draining shaft adopts grouting and reinforcing to form reinforced cement earth sand pile is improved to load-carrying capacity of soft soil foundation and controls soft soil base sedimentation.
By the setting of draining shaft in early stage, accelerate the rate of consolidation of foundation soil, after natural ground process reaches the requirement of design consolidation substantially, carry out bored grouting process again, to improve the modulus of compressibility of deep soil, reach the object improving load-carrying capacity of soft soil foundation and control soft soil base sedimentation distortion, and significantly can reduce the expense of basement process.Consolidation effect for each soil layer of deep weak soil also has quantitative Testing index to control, and can adopt the bearing capacity parameter of composite earth layer in Loading Test of Composite Foundation determination influence basin.Therefore, not only economic and technical norms have obvious advantage, and social benefit also clearly.
Through inquiry patent database, not yet find that in vertical drain well, grouting and reinforcing forms the patent report of reinforced cement earth sand pile process at present.Literature search finds, arranges vertical drain well and can solve the darker requirement of deep weak soil treating depth, and in vertical drain well, grouting and reinforcing forms the consolidation effect that the process of reinforced cement earth sand pile ensure that shallow-layer and deep soil simultaneously.The present invention is grout and strengthen processing in draining shaft, solves the problem that the conventional grouting and reinforcing degree of depth is restricted, and ensure that the effect of deep soft soil foundation process.
Summary of the invention
Object of the present invention is exactly the processing method providing a kind of building ground floor deep soft soil foundation of being applicable to store in a warehouse in order to overcome defect that above-mentioned prior art exists, effectively can improve load-carrying capacity of soft soil foundation and reduce the settlement issues of ground.
Object of the present invention can be achieved through the following technical solutions:
Be applicable to the processing method of the deep soft soil foundation of storage building ground floor, comprise the following steps:
(1) treat Ground Treatment place and carry out smooth process;
(2) after consolidation degree of soft soil foundation reaches designing requirement, according to reinforcement depth and the soil condition in place, some draining shafts are set;
(3) grouting pipe is squeezed in draining shaft inside, carry out injecting treatment from bottom to top, form reinforced cement earth sand pile, grouting test should carried out before formal slip casting, whether appropriate to check slip casting apparatus to be equipped with, rationally determine grouting parameter, after slip casting completes, without the need to extracting grouting pipe, namely complete the process to ground.
Described draining shaft is the common sand drain of diameter 300-500mm or the sand wick of diameter 120mm.
The spacing of described draining shaft meets the consolidation characteristics of foundation soil, construction period and later stage foundation settlement deformation requirement, the spacing between draining shaft, and when arranging by equilateral triangle cloth, sand wick is 1700-2500mm, and common sand drain is 1700-3800mm; Be 1600-2400mm according to sand wick during arranged in squares, common sand drain is 1600-3500mm.
Described grouting pipe is seamed minor-diameter steel-tube, and diameter of steel tube is 30-40mm, and grouting pipe can prefabricated or on-the-spot processing, and specification meets product and meets boring and slip casting requirement, and meets the needs of batch use.
Described grouting pipe is arranged along the center line of draining shaft, and insertion depth is not less than 6m, meets the consolidation characteristics of foundation soil, construction period and later stage foundation settlement deformation requirement.
Described grouting pipe injects ordinary Portland cement or high-early (strength) cement in draining shaft, and the cement grout of injection is progressively thickened by thin pulp, arrives design maximum cement paste water/binder ratio.
The ordinary Portland cement injected or high-early (strength) cement can also mix water reducing agent.
Compared with prior art, the present invention is according to reinforcement depth and soil condition, first the draining shafts such as sand drain are set, accelerate the rate of consolidation of soil layer, grout and strengthen processing in draining shaft simultaneously, form reinforced cement earth sand pile, ensure that the consolidation effect of shallow-layer and deep soil, solve the problem that the conventional grouting and reinforcing degree of depth is restricted.Its key problem in technology is that in vertical drain well, grouting and reinforcing forms reinforced cement earth sand pile processing mode, ensure that the consolidation effect of shallow-layer and deep soil, the problem that the conventional grouting and reinforcing degree of depth is restricted can be solved, reach the requirement of logistic storage building ground floor to Deformation control, Soft Ground for logistic storage building ground floor provides new practical approach, actual affected simple, economic and technical norms have obvious advantage.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the present invention when constructing;
Fig. 2 is the generalized section of the A-A of Fig. 1.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
Certain logistic storage building ground floor planar dimension is long 200m, wide 150m, about ground level 4.30m, and the depth of fill is 1.2m, has the silt clay that 10 ~ 20m is thick under foundation soil, and the design load that building ground floor bears is 50kPa.Processed by method for processing foundation proposed by the invention, to meet the bearing capacity requirement of this logistic storage building ground floor.
Foundation treatment mode for this logistic storage building ground floor is specific as follows:
First carry out levelling of the land, setting settlement observation reference point, then lay draining shaft (the sand material of draining shaft meets code requirement, and layout and the degree of depth meet design treatment and settlement calculation requires), carry out gently ramming in conjunction with precipitation consolidation process.After meeting the design degree of consolidation and requiring, then slip casting ductule is inserted in draining shaft inside, and ductule directly adopts the seamed steel pipe of 32mm, and position is the center of vertical drain well, and insertion depth is not less than 6m.Deposit in slip casting front scavenge pipe, from bottom to top, grouting and reinforcing step by step.After slip casting completes, after design strength to be achieved, adopt composite foundation load plate to detect, determine the bearing capacity parameter of composite earth layer in influence basin.
For problems, according to the arrangement of Fig. 1 ~ Fig. 2, the reinforced cement earth sand pile 4 including deep soft layer 1, draining shaft 2, grouting pipe 3 and formed wherein related to.Draining shaft is the common sand drain of diameter 300-500mm or the sand wick of diameter 120mm.The spacing of draining shaft meets the consolidation characteristics of foundation soil, construction period and later stage foundation settlement deformation requirement, the spacing between draining shaft, and when arranging by equilateral triangle cloth, sand wick is 1700-2500mm, and common sand drain is 1700-3800mm; Be 1600-2400mm according to sand wick during arranged in squares, common sand drain is 1600-3500mm.
After adopting draining shaft to accelerate consolidation, carry out grouting and reinforcing method for processing foundation, determine the parameters of draining shaft according to the actual conditions of engineering and geological conditions simultaneously, after the degree of consolidation meets design requirement, insert slip casting ductule in draining shaft to reinforce, satisfied effect can be reached.The present invention is that the process of the deep soft soil foundation of storage building ground floor provides new practical approach, has good economic benefit and application prospect.First levelling of the land is carried out during Specific construction, then draining shaft is laid by designing requirement, after vacuum method basement process reaches the requirement of the design degree of consolidation, draining shaft internal drilling arranges slip casting ductule, carry out grouting test, whether appropriate to check slip casting apparatus to be equipped with, rationally determine grouting parameter.Grout and strengthen processing on request.Adopt the bearing capacity parameter of composite earth layer in Loading Test of Composite Foundation determination influence basin.
Claims (4)
1. be applicable to the processing method of the deep soft soil foundation of storage building ground floor, it is characterized in that, the method comprises the following steps:
(1) treat Ground Treatment place and carry out smooth process;
(2) according to reinforcement depth and the soil condition in place, some draining shafts are set;
(3) squeeze into grouting pipe in draining shaft inside, carry out injecting treatment from bottom to top, forming reinforced cement earth sand pile, after slip casting completes, without the need to extracting grouting pipe, namely completing the process to ground;
Described grouting pipe is seamed minor-diameter steel-tube, and diameter of steel tube is 30-40mm, and described grouting pipe is arranged along the center line of draining shaft, and insertion depth is not less than 6m, meets the consolidation characteristics of foundation soil, construction period and later stage foundation settlement deformation requirement;
The spacing of described draining shaft meets the consolidation characteristics of foundation soil, construction period and later stage foundation settlement deformation requirement, and when the spacing between draining shaft is arranged by equilateral triangle cloth, sand wick is 1700-2500mm, and common sand drain is 1700-3800mm; Be 1600-2400mm according to sand wick during arranged in squares, common sand drain is 1600-3500mm.
2. the processing method being applicable to the deep soft soil foundation of storage building ground floor according to claim 1, it is characterized in that, described draining shaft is the common sand drain of diameter 300-500mm or the sand wick of diameter 120mm.
3. the processing method being applicable to the deep soft soil foundation of storage building ground floor according to claim 1, it is characterized in that, described grouting pipe injects ordinary Portland cement or high-early (strength) cement in draining shaft, and the cement grout of injection is progressively thickened by thin pulp, arrives design maximum cement paste water/binder ratio.
4. the processing method being applicable to the deep soft soil foundation of storage building ground floor according to claim 3, it is characterized in that, the ordinary Portland cement of injection or high-early (strength) cement can also mix water reducing agent.
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| CN201310199209.0A CN103321204B (en) | 2013-05-24 | 2013-05-24 | Be applicable to the processing method of the deep soft soil foundation of storage building ground floor |
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| CN201310199209.0A CN103321204B (en) | 2013-05-24 | 2013-05-24 | Be applicable to the processing method of the deep soft soil foundation of storage building ground floor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105507336A (en) * | 2015-11-27 | 2016-04-20 | 上海长凯岩土工程有限公司 | Method for forming composite foundation by using dewatering well |
| CN110593246A (en) * | 2019-10-18 | 2019-12-20 | 上海申元岩土工程有限公司 | Foundation leveling system for storage terrace settlement control and construction method thereof |
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| US4273475A (en) * | 1976-09-22 | 1981-06-16 | Raymond International Inc. | Load supporting structure |
| CN1485505A (en) * | 2003-08-29 | 2004-03-31 | 北京市城市建设工程研究院 | Slip casting lattice pipe with double plug and construction process |
| CN101591904A (en) * | 2008-05-28 | 2009-12-02 | 徐立新 | The reinforcement means of grouting following drainage prepressing type drainage body composite pile foundation |
| CN102206939A (en) * | 2011-04-26 | 2011-10-05 | 李燕青 | Method for processing soft soil foundation of high vacuum drainage filter pipe capable of being grouted |
| JP4808241B2 (en) * | 2008-09-03 | 2011-11-02 | 強化土エンジニヤリング株式会社 | Ground improvement method and ground improvement equipment |
| CN102767159A (en) * | 2012-08-02 | 2012-11-07 | 福州市规划设计研究院 | Strengthening method for existing revetments of urban river |
| CN202559340U (en) * | 2012-04-26 | 2012-11-28 | 浙江大学城市学院 | First-drainage post-preloading grouting stiff-core cement mixing pile |
-
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- 2013-05-24 CN CN201310199209.0A patent/CN103321204B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4273475A (en) * | 1976-09-22 | 1981-06-16 | Raymond International Inc. | Load supporting structure |
| CN1485505A (en) * | 2003-08-29 | 2004-03-31 | 北京市城市建设工程研究院 | Slip casting lattice pipe with double plug and construction process |
| CN101591904A (en) * | 2008-05-28 | 2009-12-02 | 徐立新 | The reinforcement means of grouting following drainage prepressing type drainage body composite pile foundation |
| JP4808241B2 (en) * | 2008-09-03 | 2011-11-02 | 強化土エンジニヤリング株式会社 | Ground improvement method and ground improvement equipment |
| CN102206939A (en) * | 2011-04-26 | 2011-10-05 | 李燕青 | Method for processing soft soil foundation of high vacuum drainage filter pipe capable of being grouted |
| CN202559340U (en) * | 2012-04-26 | 2012-11-28 | 浙江大学城市学院 | First-drainage post-preloading grouting stiff-core cement mixing pile |
| CN102767159A (en) * | 2012-08-02 | 2012-11-07 | 福州市规划设计研究院 | Strengthening method for existing revetments of urban river |
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