CN1632234A - Nail type cement soil stirring pile operation method - Google Patents

Nail type cement soil stirring pile operation method Download PDF

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Publication number
CN1632234A
CN1632234A CN 200410065863 CN200410065863A CN1632234A CN 1632234 A CN1632234 A CN 1632234A CN 200410065863 CN200410065863 CN 200410065863 CN 200410065863 A CN200410065863 A CN 200410065863A CN 1632234 A CN1632234 A CN 1632234A
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China
Prior art keywords
stirring
construction
pile
mixer
soil
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CN 200410065863
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CN100336982C (en
Inventor
刘松玉
宫能和
冯锦林
席培胜
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Nanjing Luding Stirring Pile Special Technology Co., Ltd.
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Southeast University
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Abstract

A nail type cement soil stirring pile operation method is a ground foundation processing method and is adapted for soft ground foundation treatment. The construction operation steps are as follows: a. leveling ground, the pile position of the nail type cement soil stirring pile is disposed in the form of quincunx or square shape; b. the position of the stirrer: a hoisting machine suspends the stirrer to a defined pile position and moves it to the center; c. stirring sinkage: starting the stirrer to make it cut soil from up to down along a guide frame, and starting a slurry feeding pump to inject cement slurry to the ground, the stirring vanes will rotate to stir the cement soil, the stirrer will continue moving down till to designed depth; d. hoisting and stirring: the stirrer will be hoisted and continue stirring the cement soil till to the ground surface or designed elevation more than 50 cm; repeating the steps c and d to complete the construction of the lower part pile body; e, the construction of expanding head part: when the stirrer is hoisted to the ground surface, the slurry feeding pump is first turned off, starting the flex switch for the stirring vanes to make the stirring vanes extend to designed length, and then repeating the steps c and d to complete the construction of the top expansion heat part.

Description

Nail type cement soil stirring pile operation method
Technical field
The present invention is a kind of method for processing foundation, is applicable to treatment of soft foundation, belongs to technical field of civil engineering.
Background technology
Cement mixing method is succeeded in developing as far back as Sweden, carries out laboratory experiment and mechanical development work by Metallurgical Research Institute, Department of Architecture and Water Planning And Design Institute Of Traffic Ministry in domestic 1977.In the reinforced soft soil ground engineering, succeedd first in 1980.After this in national reinforced soft soil ground engineering, promote and come, particularly the Soft Ground in highway construction.
Soft Ground in the highway construction is to guarantee the key of project link, and occupies larger proportion in the engineering total price.A large amount of engineering practices show that it is simple that the cement mixing method method has construction, fast, vibrates advantages such as little, can improve the stability of soft foundation effectively, reduce and the control settling amount.Cement mixing method has now developed into a kind of soft foundation processing method commonly used, mainly is applicable to reinforce the saturated soft clay ground.This method is to utilize cement materials such as (or lime) as curing compound, by special Mixing Machine, in the ground depths, on the spot weak soil and curing compound are forced to stir, by producing series of physical and chemical reaction between curing compound and weak soil, weak soil is hardened the cement mixing method that becomes to have globality, water stability and certain intensity.This cement mixing method is formed composite foundation with all soil of stake, thereby improves bearing capacity of foundation soil, reduces foundation settlement.
Also there are more following problems in cement mixing method in Soft Ground:
(1) the native shared effect of stake is difficult to coordinate, and bed course or geotextile reinforcement layer need be set at the stake top;
(2) pile spacing is less, and cost is higher, has influenced the large scale application of cement mixing method;
(3) pile spacing is less, has destroyed the natural structure of the soil body, and self intensity of the crust layer soil body is not fully utilized.
The present invention is primarily aimed at the problem that exists in the above-mentioned construction, and the form and the corresponding method of operation of cement mixing method are improved, and has proposed a kind of novel nail type cement soil stirring pile.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of easy construction, simple to operate, can fully coordinate the nail type cement soil stirring pile operation method of pile soil common action.
Technical scheme: the present invention mainly on the basis of analyzing cement mixing method composite foundation Stress Transfer rule, by enlarging cement mixing method stake top section, forms the cement mixing method of nail shape; Utilize the soil arching effect and the soil stress regularity of distribution, stake, soil are organically combined, guarantee its compatible deformation, and strengthen the composite foundation upper strength, reach the expansion pile spacing, save the purpose of construction costs.
This invention mainly is that conventional uniform section cement mixing method is changed over nail type cement soil stirring pile.The concrete constructing operation step of nail type cement soil stirring pile is as follows:
A, smooth place, the stake position of nail type cement soil stirring pile is adopted quincunx or square arrangement (quincunx is that any adjacent three piles constitute equilateral triangle);
B, mixer location: crane suspention mixer is to specifying stake position and centering;
C, stir: start mixer, make mixer along leading truck to incision soil, open simultaneously and send stock pump to the soil body mud of spraying water, stirring vane rotation stirring concrete earth, mixer continue to sink, up to projected depth;
D, lifting are stirred: mixer promotes, and continues stirring concrete earth simultaneously, to the face of land or the above 50cm of design elevation; Repeat above steps d, finish bottom pile body construction;
The construction at e, enlarged footing position: when treating that mixer rises to the face of land, turn off earlier and send stock pump, open the flexible switch of stirring vane, make paddle be elongated to design length, repeat above step c, the d step then, finish the construction of the enlarged footing part on top;
F, finish single pile construction.
The present invention makes similar nail shape to cement mixing method, and the top enlarged footing plays the effect of similar cushion cap in working mechanism; Enlarge pile spacing, reduce disturbance, make full use of self intensity of soil arching effect and crust layer the original state soil body; Guarantee stake, earth cooperation work, compatible deformation is avoided Non-uniform Settlement of Composite Foundation; Because self intensity of soil arching effect and crust layer obtains performance utilization, can enlarge pile spacing at double in design and construction, to save construction costs.
Beneficial effect: this worker's method easy construction, simple to operate.Its advantage mainly contains:
(1) utilizes conventional equipment processing to improve, be easy to promote;
(2) the enlarged footing part is once constructed with stake and is finished;
(3) under the effect of roadbed overlying burden, make full use of native arching action, enlarged footing partly makes pile body
(4) and the stake all native compatible deformations, reach better composite foundation effect;
(5) make full use of soil stress transfer law and enlarged footing effect, can increase exponentially pile spacing, save construction costs greatly.
Description of drawings
Fig. 1 is square piling plan.Nail type cement soil stirring pile 1 is wherein arranged, construction plant 2.
Fig. 2 is quincunx piling plan.
Fig. 3 is the nail type cement soil stirring pile construction flow chart.Stirring vane 31 is wherein arranged; Mixer drilling rod 32; Actuating unit 33; Power set 34; Bottom pile body 35; Top enlarged footing part pile body 36.
The specific embodiment
Embodiment is a certain construction section, 8 of wet shot stakes of site operation test, and stake is long 10 meters, mixes gray scale 15%, and stake is through 500mm, and top enlarged stake is through 900mm, and the variable cross-section position lays respectively at 3 meters on a top and 5 meters.
(1) smooth place;
(2) square arrangement is adopted in test pile stake position;
(3) mixer location: crane suspention mixer is to specifying stake position and centering;
(4) stir: start mixer, make mixer along leading truck to incision soil, stake is through 500mm, opens and send stock pump to the soil body mud of spraying water, the forward and reverse stirring concrete earth that rotates simultaneously of blade, mixer continue to sink, up to 10 meters degree of depth;
(5) promote stirring: mixer promotes, continues simultaneously stirring concrete earth, to the face of land;
(6) repeat (4), (5) once finish bottom pile body construction;
(7) construction at enlarged footing position: when treating that mixer rises to the face of land, turn off earlier and send stock pump, open the flexible switch of stirring vane, make paddle be elongated to the stake of design through 900mm, repeat (4) (5), (6) step then, finish the construction (construction depth at enlarged footing position is: 4 is 3 meters, and 4 is 5 meters in addition) of the enlarged footing part on top.
Result through field trial and laboratory test research shows: two parts can be combined into a complete integral body about (1) nail type cement soil stirred; (2) pile body is complete evenly; (3) can give full play to and utilize self intensity of the soil body, improve the bearing capacity of composite foundation: (4) enlarged footing is guaranteed stake, earth cooperation work, and compatible deformation is avoided Non-uniform Settlement of Composite Foundation; (5) increase pilespacing, total cost is saved about more than 30%.

Claims (1)

1, a kind of nail type cement soil stirring pile operation method is characterized in that the constructing operation step is as follows:
A, smooth place, quincunx or square arrangement is adopted in the stake position of nail type cement soil stirring pile;
B, mixer location: crane suspention mixer is to specifying stake position and centering;
C, stir: start mixer, make mixer along leading truck to incision soil, open simultaneously and send stock pump to the soil body mud of spraying water, stirring vane rotation stirring concrete earth, mixer continue to sink, up to projected depth;
D, lifting are stirred: mixer promotes, and continues stirring concrete earth simultaneously, to the face of land or the above 50cm of design elevation; Repeat above step c, d, finish bottom pile body construction;
The construction at e, enlarged footing position: when treating that mixer rises to the face of land, turn off earlier and send stock pump, open the flexible switch of stirring vane, make paddle be elongated to design length, repeat above step c, the d step then, finish the construction of the enlarged footing part on top;
F, finish single pile construction.
CNB2004100658633A 2004-12-23 2004-12-23 Nail type cement soil stirring pile operation method Active CN100336982C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2004100658633A CN100336982C (en) 2004-12-23 2004-12-23 Nail type cement soil stirring pile operation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2004100658633A CN100336982C (en) 2004-12-23 2004-12-23 Nail type cement soil stirring pile operation method

Publications (2)

Publication Number Publication Date
CN1632234A true CN1632234A (en) 2005-06-29
CN100336982C CN100336982C (en) 2007-09-12

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ID=34846557

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100366828C (en) * 2005-12-22 2008-02-06 上海交通大学 Method for construction of deep layer rotating spraying mixture pile with diffusion preventing plate
CN101838987A (en) * 2010-04-21 2010-09-22 东南大学 Operation method of piles with variable cross section for reinforcing shield end soil body
CN101514549B (en) * 2009-04-01 2011-05-11 东南大学 Method using intermediate mixing piles for treating three-layer soft foundation
CN102518127A (en) * 2012-01-13 2012-06-27 海南大学 Method for forming cement-soil pile in organic matter disseminated sand
CN102561332A (en) * 2012-02-09 2012-07-11 东南大学 Continuous variable-diameter cement-soil mixed pile forming method
CN104032731A (en) * 2014-04-29 2014-09-10 周兆弟 Plum-blossom-shaped cement soil mixing pile and forming method thereof
CN104141303A (en) * 2014-07-28 2014-11-12 厦门中平公路勘察设计院有限公司 Construction technology for nail-type cement-soil mixing pile
CN105926596A (en) * 2016-04-26 2016-09-07 浙江水利水电学院 Stirring device and method for stirring sea mud
CN111364454A (en) * 2020-03-30 2020-07-03 东南大学 Construction method of variable cross-section composite pile
CN111877386A (en) * 2020-06-28 2020-11-03 东南大学 Wedge-shaped composite pile and construction method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60115710A (en) * 1983-11-29 1985-06-22 Onoda Cement Co Ltd Improvement work of soft ground
CN2215589Y (en) * 1994-05-24 1995-12-20 沈学智 Diameter changeable agitation drill
CN1443903A (en) * 2003-04-22 2003-09-24 刘冀豪 Reducing stirring pile pile-forming process
CN1216212C (en) * 2003-11-07 2005-08-24 东南大学 Pile forming technology for nail-shaped pile

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100366828C (en) * 2005-12-22 2008-02-06 上海交通大学 Method for construction of deep layer rotating spraying mixture pile with diffusion preventing plate
CN101514549B (en) * 2009-04-01 2011-05-11 东南大学 Method using intermediate mixing piles for treating three-layer soft foundation
CN101838987A (en) * 2010-04-21 2010-09-22 东南大学 Operation method of piles with variable cross section for reinforcing shield end soil body
CN102518127A (en) * 2012-01-13 2012-06-27 海南大学 Method for forming cement-soil pile in organic matter disseminated sand
CN102561332A (en) * 2012-02-09 2012-07-11 东南大学 Continuous variable-diameter cement-soil mixed pile forming method
CN102561332B (en) * 2012-02-09 2014-01-22 东南大学 Continuous variable-diameter cement-soil mixed pile forming method
CN104032731A (en) * 2014-04-29 2014-09-10 周兆弟 Plum-blossom-shaped cement soil mixing pile and forming method thereof
CN104141303A (en) * 2014-07-28 2014-11-12 厦门中平公路勘察设计院有限公司 Construction technology for nail-type cement-soil mixing pile
CN105926596A (en) * 2016-04-26 2016-09-07 浙江水利水电学院 Stirring device and method for stirring sea mud
CN105926596B (en) * 2016-04-26 2019-04-26 浙江水利水电学院 It is a kind of for stirring the agitating device and stirring means of ooze
CN111364454A (en) * 2020-03-30 2020-07-03 东南大学 Construction method of variable cross-section composite pile
CN111877386A (en) * 2020-06-28 2020-11-03 东南大学 Wedge-shaped composite pile and construction method thereof

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Owner name: NANJING LUDING MIXING PILE SPECIAL TECHNOLOGY CO.,

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Effective date: 20090508

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Effective date of registration: 20090508

Address after: Nanjing city Ruijin Baixia District village 32-2

Patentee after: Nanjing Luding Stirring Pile Special Technology Co., Ltd.

Address before: No. four arch 2, Nanjing City, Jiangsu Province

Patentee before: Southeast University