CN102561332B - Continuous variable-diameter cement-soil mixed pile forming method - Google Patents
Continuous variable-diameter cement-soil mixed pile forming method Download PDFInfo
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- CN102561332B CN102561332B CN201210027949.1A CN201210027949A CN102561332B CN 102561332 B CN102561332 B CN 102561332B CN 201210027949 A CN201210027949 A CN 201210027949A CN 102561332 B CN102561332 B CN 102561332B
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Abstract
The invention relates to a continuous variable-diameter cement-soil mixed pile operating method. Hydraulic automatically-retractable rotary blades are started when the lowermost rotary blade enters soil, extending and retracting of the rotary blades at equal intervals are in linkage, and when the lowermost rotary blade starts retracting, retracting of the upper rotary blade is delayed correspondingly by calculating the time according to the intervals and the drilling down speed, so that diameter equality of formed piles at same pile length position can be guaranteed. The diameters of the piles between the lowermost rotary blade and the uppermost rotary blade are equal when drilling to a designed pile bottom elevation. When hoisting starts, the uppermost rotary blade retracts to have equal diameter to the pile forming diameter of the lowermost rotary blade at the position, and retracts with equal diameter to the pile forming diameter of the lowermost rotary blade in the drilling down process, and the intermediate rotary layer and the lowermost rotary blade are correspondingly delayed in retracting by calculating the time according to the intervals and the lifting speed, so that a drill bit can be lifted to a designed pile top elevation.
Description
Technical field
The present invention is a kind of method that is applicable to Soft Ground, relates to the operation format that carrys out soft soil foundation with continuous variable diameter cement mixing method, belongs to the technical field of method for processing foundation.
Background technology
China coast, the river basin soft foundation that often distributes, under the dynamic actions such as load, circulation, vehicle, foundation settlement is the principal mode of foundation failure, often causes the quality problems of speedway, railway, airport, harbour.In the whole bag of tricks of soft soil foundation, applying maximum methods is to select composite foundation, and in the reinforcement means of composite foundation, particularly, in the Soft Ground in traffic engineering, what often select is to adopt cement mixing method technology to carry out consolidated subsoil.Engineering practice shows, it is simple that the method for mixing cement and soil into pile has construction, and fast, the advantage such as disturbance is little, can improve the stability of soft foundation effectively, reduces and controls settling amount.Cement mixing method has now developed into a kind of conventional soft-soil foundation treatment method, and according to the difference of soil property water content, the reinforced material of selection is different.This method is to utilize the materials such as cement flour, cement paste or cement mortar as curing compound, the mode stirring by special Mixing Machine, in ground depths, on the spot by weak soil and reinforced material action of forced stirring, by producing a series of physical and chemical reaction between reinforced material and weak soil, weak soil is hardened into the cement mixing method with globality, water stability and some strength.This agitation pile forms composite foundation together with all soil of stake, thereby improves bearing capacity of foundation soil, reduces foundation settlement.
By a large amount of engineering practices, some problems below discovery light water earth agitation pile exists in Soft Ground:
(1) cement mixing method is to adopt the method for isometrical (same diameter) to process substantially in Soft Ground, because geology has been divided a lot of layers in the process forming, and the water content of every one deck and other indexs are all different, employing waits routing method to process, reach design bearing capacity requirement, all, by the poorest one deck intended diameter or increase reinforced material consumption, this increases reinforcement cost greatly.
(2) in cement mixing method, also there is the processing mode of reducing, but can only have two kinds of single diameters, because geology layering is more, reinforcement cost can not be dropped to minimum; Simultaneously the cement mixing method of two kinds of single diameters is sudden change in diameter variation place, when cement mixing method bearing load, can produce stress concentrate at the bonding surface of two kinds of diameters, and bonding surface is easily destroyed.
Due to the existence of upper genus problem, popularization and the use of cement mixing method technology have been affected; Also seriously restricted the range of application of cement mixing method simultaneously.
Continuous variable diameter cement mixing method form selected in processing soft soil will reduce reinforcement cost greatly, can meet and establish simultaneously
The requirement of meter strength of composite foundation.
Summary of the invention
Technical problem: the problem that the present invention exists mainly for light water earth agitation pile pile constructing process is improved, and has proposed a kind of continuous variable diameter cement soil stirring pile operation method, and the problems referred to above are resolved.
Technical scheme: the present invention is mainly continuous variable expanded diameter, each layer of rotating vane is hydraulic pressure automatic telescopic rotating vane, according to designing requirement, expanded diameter changed arbitrarily.
The expanded diameter of permanent position in going down process: when orlop rotating vane buries, open hydraulic pressure automatic telescopic rotating vane, distance between every layer of rotating vane is identical, every layer of rotating vane flexible is interlock, when orlop rotating vane starts to stretch, upper strata rotating vane, according to the distance of being separated by and the speed of lower brill, calculates the time, corresponding delay is flexible, guarantees at the long position of identical stake expanded diameter identical; Under get into the design stake end during absolute altitude, between orlop and the superiors' rotating vane, a stake footpath for distance is isometrical;
The expanded diameter of permanent position in lifting process: when starting to promote, the superiors' rotating vane is the expanded diameter in this position stretch (isometrical with it) according to orlop rotating vane, and the expanded diameter in going down process carries out isometrical flexible along orlop rotating vane, middle and orlop rotating vane basis is separated by distance and hoisting velocity, calculate the time, corresponding delay is flexible, drill bit is promoted to design stake top mark high
This invention is mainly light water earth agitation pile (isometrical) job practices to be changed over to continuous variable diameter Soil-cement execute
Work method, forms a set of new construction, and concrete operation step is as follows:
A. flatten place;
B. mixing pile machine is located: mobile mixing pile machine, by drill bit align piles position;
C. under, bore: start drilling rod rotation, restart water booster system, the chain in water booster system pressurizes to drilling rod, makes drilling rod downward along leading truck, the orlop rotating vane of drilling rod bottom drill bit is first cut soil, is buried, and buries, stirring, binder after middle and the superiors' rotating vane;
D. spray adds cement flour, cement paste or cement mortar, stirs: open material-spraying device, material spray after orlop rotating vane buries, stirs after middle rotating vane buries, and binder after the superiors' rotating vane buries, until projected depth stops material spray;
E. change expanded diameter: each layer of rotating vane is hydraulic pressure automatic telescopic rotating vane, when orlop rotating vane buries, control hydraulic pressure automatic telescopic rotating vane flexible, according to designing requirement, expanded diameter is changed,
F. guarantee the expanded diameter of permanent position: the distance between every layer of rotating vane is identical, every layer of rotating vane flexible is interlock, when orlop rotating vane starts to stretch, upper strata rotating vane is according to the distance of being separated by and the speed of lower brill, calculate the time, corresponding delay is flexible, guarantees at the long position of identical stake expanded diameter identical;
G. promote, stir: when reaching projected depth, stop material spray, water booster system is commutated simultaneously, chain starts to promote, under get into the design stake end during absolute altitude, between orlop and the superiors' rotating vane, the stake footpath of distance is isometrical, when starting to promote, according to orlop rotating vane, the expanded diameter in this position stretches isometrical with it the superiors' rotating vane, and the expanded diameter in going down process carries out isometrical flexible along orlop rotating vane, middle and orlop rotating vane basis is separated by distance and hoisting velocity, calculate the time, corresponding delay is flexible, drill bit is promoted to design stake top mark high, complete continuous variable diameter cement-soil stirring pile construction.
Beneficial effect: the method easy construction, simple to operate, its advantage mainly contains:
(1) can according to different geological conditionss, form different expanded diameters and meet requirement for bearing capacity;
(2) at the bonding surface of different-diameter, take the mode of Diameter Gradual Change, solved problem of stress concentration;
(3) owing to meeting design bearing capacity requirement by any reducing, to compare with the cement mixing method of two kinds of single diameters with isometrical, construction costs reduces greatly, and the range of application of cement mixing method is expanded;
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention.
The specific embodiment
The present invention is continuous variable expanded diameter, and each layer of rotating vane is hydraulic pressure automatic telescopic rotating vane, according to designing requirement, expanded diameter changed arbitrarily.
The expanded diameter of permanent position in going down process: when orlop rotating vane buries, open hydraulic pressure automatic telescopic rotating vane, distance between every layer of rotating vane is identical, every layer of rotating vane flexible is interlock, when orlop rotating vane starts to stretch, upper strata rotating vane, according to the distance of being separated by and the speed of lower brill, calculates the time, corresponding delay is flexible, guarantees at the long position of identical stake expanded diameter identical; Under get into the design stake end during absolute altitude, between orlop and the superiors' rotating vane, a stake footpath for distance is isometrical;
The expanded diameter of permanent position in lifting process: when starting to promote, the superiors' rotating vane is the expanded diameter in this position stretch (isometrical with it) according to orlop rotating vane, and the expanded diameter in going down process carries out isometrical flexible along orlop rotating vane, middle and orlop rotating vane basis is separated by distance and hoisting velocity, calculate the time, corresponding delay is flexible, drill bit is promoted to design stake top mark high
This invention is mainly light water earth agitation pile (isometrical) job practices to be changed over to continuous variable diameter Soil-cement execute
Work method, forms a set of new construction, and concrete operation step is as follows:
(1) leveling place;
(2) mixing pile machine location: mobile mixing pile machine, by drill bit align piles position;
(3) lower boring: start drilling rod rotation, restart water booster system, the chain in water booster system pressurizes to drilling rod, makes drilling rod downward along leading truck, the orlop rotating vane of drilling rod bottom drill bit is first cut soil, is buried, and buries, stirring, binder after middle and the superiors' rotating vane;
(4) spray reinforced material (cement flour, cement paste or cement mortar etc.), stirring: open material-spraying device, material spray after orlop rotating vane buries, stirs binder after the superiors' rotating vane buries after middle rotating vane buries, until projected depth stops material spray;
(5) change expanded diameter: when orlop rotating vane buries, open hydraulic pressure automatic telescopic rotating vane (each layer of rotating vane is hydraulic pressure automatic telescopic rotating vane), according to designing requirement, expanded diameter is changed arbitrarily.
(6) guarantee the expanded diameter of permanent position: the distance between every layer of rotating vane is identical, every layer of rotating vane flexible is interlock, when orlop rotating vane starts to stretch, upper strata rotating vane is according to the distance of being separated by and the speed of lower brill, calculate the time, corresponding delay is flexible, guarantees at the long position of identical stake expanded diameter identical;
(7) promote, stir: when reaching projected depth, stop material spray, water booster system is commutated simultaneously, chain starts to promote, under get into the design stake end during absolute altitude, between orlop and the superiors' rotating vane, the stake footpath of distance is isometrical, when starting to promote, the superiors' rotating vane is the expanded diameter in this position stretch (isometrical with it) according to orlop rotating vane, and the expanded diameter in going down process carries out isometrical flexible along orlop rotating vane, middle and orlop rotating vane basis is separated by distance and hoisting velocity, calculate the time, corresponding delay is flexible, drill bit is promoted to design stake top mark high,
(8) complete continuous variable diameter cement-soil stirring pile construction.
Claims (1)
1. a continuous variable-diameter cement-soil mixed pile forming method, is characterized in that the method comprises the following steps:
A. flatten place;
B. mixing pile machine is located: mobile mixing pile machine, by drill bit align piles position;
C. under, bore: start drilling rod rotation, restart water booster system, the chain in water booster system pressurizes to drilling rod, makes drilling rod downward along leading truck, the orlop rotating vane of drilling rod bottom drill bit is first cut soil, is buried, and buries, stirring, binder after middle and the superiors' rotating vane;
D. spray adds cement flour, cement paste or cement mortar, stirs: open material-spraying device, material spray after orlop rotating vane buries, stirs after middle rotating vane buries, and binder after the superiors' rotating vane buries, until projected depth stops material spray;
E. change expanded diameter: each layer of rotating vane is hydraulic pressure automatic telescopic rotating vane, when orlop rotating vane buries, control hydraulic pressure automatic telescopic rotating vane flexible, according to designing requirement, expanded diameter is changed,
F. guarantee the expanded diameter of permanent position: the distance between every layer of rotating vane is identical, every layer of rotating vane flexible is interlock, when orlop rotating vane starts to stretch, upper strata rotating vane is according to the distance of being separated by and the speed of lower brill, calculate the time, corresponding delay is flexible, guarantees at the long position of identical stake expanded diameter identical;
G. promote, stir: when reaching projected depth, stop material spray, water booster system is commutated simultaneously, chain starts to promote, under get into the design stake end during absolute altitude, between orlop and the superiors' rotating vane, the stake footpath of distance is isometrical, when starting to promote, according to orlop rotating vane, the expanded diameter in this position stretches isometrical with it the superiors' rotating vane, and the expanded diameter in going down process carries out isometrical flexible along orlop rotating vane, middle and orlop rotating vane basis is separated by distance and hoisting velocity, calculate the time, corresponding delay is flexible, drill bit is promoted to design stake top mark high, complete continuous variable diameter cement-soil stirring pile construction.
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| CN201210027949.1A CN102561332B (en) | 2012-02-09 | 2012-02-09 | Continuous variable-diameter cement-soil mixed pile forming method |
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| CN201210027949.1A CN102561332B (en) | 2012-02-09 | 2012-02-09 | Continuous variable-diameter cement-soil mixed pile forming method |
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| CN102561332B true CN102561332B (en) | 2014-01-22 |
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| CN103132512B (en) * | 2013-03-22 | 2014-12-10 | 东南大学 | Layering mixing pile machine for reinforcing soft soil foundations |
| CN103437349B (en) * | 2013-08-26 | 2015-10-28 | 中冶天工集团有限公司 | The construction method of steel concrete perfusion shaped pile |
| CN108316292B (en) * | 2018-02-08 | 2020-02-07 | 中交第二航务工程局有限公司 | Construction method for cement mixing pile group |
| 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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| CN101413263A (en) * | 2008-09-27 | 2009-04-22 | 余安南 | Rotary enlarging reducing cone spiral tray concrete filling pile and pile-forming apparatus and construction method |
| CN101649612A (en) * | 2008-08-14 | 2010-02-17 | 刘全林 | Method for forming variable-diameter cement-soil stirring piles |
| 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 |
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| CN1120102A (en) * | 1995-01-06 | 1996-04-10 | 张荣久 | Variable-diameter cast-in-situ pile and its manufacture technology |
| JPH11209970A (en) * | 1998-01-23 | 1999-08-03 | Nittoc Constr Co Ltd | Synthetic pile constructing excavator-agitator |
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| JP2005061216A (en) * | 2004-11-30 | 2005-03-10 | Takenaka Komuten Co Ltd | Slime disposer for excavating pile hole expanded in diameter in part |
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