CN103215964A - Method of industrial systematic treatment of foundation through prestressed concrete solid pre-formed piles - Google Patents
Method of industrial systematic treatment of foundation through prestressed concrete solid pre-formed piles Download PDFInfo
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- CN103215964A CN103215964A CN2013101626361A CN201310162636A CN103215964A CN 103215964 A CN103215964 A CN 103215964A CN 2013101626361 A CN2013101626361 A CN 2013101626361A CN 201310162636 A CN201310162636 A CN 201310162636A CN 103215964 A CN103215964 A CN 103215964A
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Abstract
The invention discloses a method of industrial systematic treatment of a foundation through prestressed concrete solid pre-formed piles. The prestressed concrete solid pre-formed piles are hit, pressed or vibrated and punched into foundation soil which needs to be processed through factory batch prefabrication and professional construction equipment. Through the functions of replacement, compaction and the like on the foundation soil by the pre-formed piles, the piles and soil around the piles are combined to form the composite foundation, and accordingly the functions of improving the bearing capacity of the foundation, deformation of the foundation and permeability properties are played. The prestressed concrete solid pre-formed piles serve as pile materials of the processing of the foundation, and the piles have the advantages of being low in construction cost, good in pile material property, suitable for factory mass production, small in production investment, high in efficiency, good in product quality and the like. Compared with existing foundation processing methods such as a vibroflotation method, a sand-gravel pile method, a cement-flyash-gravel pile method and a compaction soil-cement pile method, the method has the advantages of being reliable in construction quality, rapid to construct, environment-friendly, low in cost and the like. The method is a technology creation which is suitable for industrialization, specialization and product, and energy-saving and environment-friendly.
Description
Technical field:
The present invention relates to a kind of method of using the solid preformed pile industrial system of prestressed concrete Ground Treatment, belong to the construction technical field of construction.
Background technology:
At present, existing method for processing foundation mainly contains: method for processing foundation such as vibroflotation method, sand-gravel pile method, CFG method, rammed-cement-soil pile, dynamic compaction etc.It mainly is to adopt method pile holes in foundation soil such as vibration, impact, boring, by modes such as backfill, compacting, stirrings sand, stone, cement, flyash, lime and compound thereof etc. are inserted a hole again, form composite foundation with inter-pile soil by the pile body that filler constituted.These method for processing foundation have following shortcoming:
1, specialized, integrated degree is low, can not satisfy the developing direction of present batch production, the integration of industry.
2, the strength of the mixing pile that is formed by various fillers is low, pile quality is poor.
3, construction site management complexity, long construction period, labour intensity is big, and efficiency of construction is low.
4, environmental pollution is serious, produces pollutants such as a large amount of noises, sewage sludge, dust in the work progress.
5, ground treatment effect different restricted bigger because of soil condition, will be according to soil condition, select different processing methods and construction technology for use as sand, silt, silty clay, plain fill, miscellaneous fill, mucky soil etc., quality control is difficult in the work progress.
6, calculation model for design complexity, how by the empirical data estimation, less economical.
7, after ground was handled, foundation deformation was big, causes the superstructure settling amount big.
Summary of the invention:
The objective of the invention is to overcome the deficiency of above-mentioned prior art and a kind of scalable, easy construction is provided, does not have environment pollution, reliable in quality, batch production production, embody the method for the solid preformed pile Ground Treatment of high efficiency application prestressed concrete of big integration of industry construction, its ground treatment effect is good, short construction period, good economy performance has very strong promotion prospect.
Purpose of the present invention can reach by following measure: a kind of method of using the solid preformed pile industrial system of prestressed concrete Ground Treatment, it is characterized in that comprising the steps: that (1) makes: in factory, use pretensioned prestressing technology, make the solid preformed pile of prestressed concrete, the solid preformed pile of prestressed concrete is done skeleton by prestressing force master muscle and stirrup, concreting and making, all between 150 centimetres-450 centimetres, the single-unit stake is long between 3 meters-20 meters for the diameter of section of preformed pile, the length of side or equivalent diameter, the length of side; (2) transportation: preformed pile reaches designing requirement by stream curing to concrete strength in factory, after the pile quality passed examination, preformed pile is transported to each building site; (3) construction: at building-site, require behind the measurement and positioning of stake site according to design drawing, the solid preformed pile of prestressed concrete is beaten, pressed or shake with professional construction equipment to be flushed in the foundation soil that needs to handle, form composite foundation by engineers and technicians.
In order to realize that further purpose of the present invention, the pile spacing between the described preformed pile are 2-10 times of stake bore dia (or equivalent diameter), the stake position is arranged as equilateral triangle, square or rectangle between the preformed pile.
In order further to realize that purpose of the present invention, the cross section of described prestressed concrete pile are square, rectangle or circle.
In order further to realize that purpose of the present invention, the bearing capacity of described composite foundation are the stack of the bearing capacity of the bearing capacity of inter-pile soil and preformed pile, the characteristic value of foundation bearing capacity of the bearing capacity of composite foundation is calculated by following design formulas:
The present invention can produce following good effect compared with the prior art:
1, prestressed concrete pile of the present invention adopts batch production to make, the production efficiency height, and good product quality, product price is low, save the area, energy-conserving and environment-protective, small investment.
2, the present invention adopts prestressed concrete pile to be because the prestressed pile cost is low, and the pile body anti-bending strength is good, is convenient to transportation, and the construction breakage rate is low.
3, the present invention uses the solid preformed pile of prestressed concrete as displacement, compacted, the material that strengthens foundation soil, by pile quality is stable, intensity is high, construction is convenient, and the composite foundation high treating effect formed of inter-pile soil.
4, the present invention is a kind of job practices of the integration of industry, integrates each professional division, and the efficient height is saved manually, and labor strength is low, and is easy to utilize.
Description of drawings:
Fig. 1 is that schematic diagram is arranged in a kind of position of the present invention;
Fig. 2 is that schematic diagram is arranged in another kind of stake of the present invention position;
Fig. 3 is the solid preformed pile ground of prestressed concrete of the present invention processing profiles figure.
The specific embodiment:
Below the specific embodiment of the present invention is elaborated:
A kind of method of using the solid preformed pile industrial system of prestressed concrete Ground Treatment, it comprises the steps: that (1) makes: use pretensioned prestressing technology in factory, make the solid preformed pile of prestressed concrete, the solid preformed pile of prestressed concrete is done skeleton by prestressing force master muscle and stirrup, concreting and making, the diameter of section of preformed pile, the length of side or equivalent diameter, the length of side are all between 150 millimeters-450 millimeters, the economy of the preformed pile of the major diameter or the long length of side has just obviously reduced, and the single-unit stake is long between 3 meters-20 meters; The prestressed concrete pile cross section can be shapes such as square, rectangle, circle, plays filling, displacement, compacted, the effect that strengthens in foundation soil; (2) transportation: preformed pile reaches designing requirement by stream curing to concrete strength in factory, after the pile quality passed examination, by professional carrier preformed pile is transported to each building site, carrier by specialty can reduce the loss of stake in transportation, reduce cost of transportation, raise the efficiency.(3) construction: at building-site, require behind the measurement and positioning of stake site according to design drawing by engineers and technicians, with professional construction equipment such as diesel type pile driver, Static pressure pile driver, vibrating hammer etc., the solid preformed pile of prestressed concrete beaten, presses or shake to be flushed in the foundation soil that needs to handle form composite foundation.(4) preformed pile Ground Treatment technical requirements: the pile spacing of preformed pile is 2-10 a times of stake bore dia (or equivalent diameter), and this mainly is to consider compacted and replacement result according to the difference of soil condition; The stake position arranges it can is modes (referring to Fig. 1, Fig. 2) such as equilateral triangle, square or square type, and wherein 1 is preformed pile, and 2 is inter-pile soil; The stake of squeezing into is long can calculate according to parameters such as foundation soil bearing capacity, stake footpath size, pile spacings; Also the method that can do experiment by the scene is beaten test pile earlier, and it is definite test pile to be carried out mode such as load test again.
Preformed pile Ground Treatment principle: by the preformed pile squeezed into to the displacement of foundation soil, effect such as compacted, make preformed pile 1, inter-pile soil 2 and foundation soil 3 form composite foundation (referring to Fig. 3), thereby play the effect that improves bearing capacity of foundation soil, improves foundation deformation and penetration property.The bearing capacity of composite foundation is mainly provided by two aspects, and the one, provide by inter-pile soil compacted, improvement, the 2nd, provide by collateral resistance, the end resistance of preformed pile in soil.
The characteristic value of foundation bearing capacity of the solid preformed pile Ground Treatment of prestressed concrete can be estimated by following principle: the one, provide bearing capacity by inter-pile soil, inter-pile soil improves through compacted, the more original bearing capacity of displacement of stake, and the value of this bearing capacity can provide by the load test or the empirical data at scene; The 2nd, provide by the collateral resistance and the end resistance of preformed pile in each layer soil, this bearing capacity also can calculate by on-the-spot load test or empirical formula.The stack of the bearing capacity of inter-pile soil and the bearing capacity of preformed pile is exactly the bearing capacity of composite foundation.
The design formulas of deriving according to above-mentioned principle is as follows:
Embodiment 1: certain building design basis bottom surface land requires characteristic value of foundation bearing capacity to be not less than 350k at the heavy farinose argillic horizon of first floor
PaAnd this layer characteristic load bearing capacity f
AkBe 140k
Pa, through this bed thickness of geological mapping
Be 4 meters, the pile side resistance characteristic value that can provide (
) be 24k
Pa, its following each layer soil is respectively second layer silty clay, bed thickness
Be 2 meters, the pile side resistance characteristic value that provides (
) be 32.5k
PaThe 3rd layer of clay silt, bed thickness
Be 2 meters, the pile side resistance characteristic value that provides (
) be 32.5k
PaThe 4th layer of flour sand, bed thickness
Be 3 meters, the pile side resistance characteristic value that provides (
) be 30k
PaThe layer 5 clay silt, bed thickness
Be 2.5 meters, the pile side resistance characteristic value that provides (
) be 35k
PaThe layer 6 fine sand, bed thickness
Be 2 meters, the pile side resistance characteristic value that provides (
) be 35k
PaThe layer 7 silty clay, bed thickness
Be 4 meters, the end resistance characteristic value that provides (
) be 500k
Pa
For satisfying the requirement for bearing capacity of design, adopt the prestressing force precast square pile of length of side 300mm, pile spacing is set at 1.6 meters (pile spacing of present embodiment preformed pile is 5.33 times of stake bore dia (or equivalent diameter)), and stake is passed through one to six layer of native bearing course at pile end land on the layer 7 farinose argillic horizon.300 millimeters of the length of sides of preformed pile.
As calculated, A
P=0.09m
2, u
p=1.2m, A=2.56m
2, α=1, n=6,
The long L=of stake
=
+
+
+
+
+
=15.5 meters, adopting single-unit stake stake long is 15.5 meters
So, the prefabricated length of side is 300 millimeters in precast yard, and the single-unit prestressed concrete square pile that stake is long 15.5 meters is when treating the concrete strength of pile maintenance to designing requirement, be transported to the building site by professional carrier, get to the underground composite foundation that forms by professional pile sinking equipment by the interval of 1.6 meters of pile spacings.
Implementation column 2(Comparative Examples): for satisfying the requirement for bearing capacity of the building design among the embodiment 1, adopt the CFG (a kind of common method for processing foundation) of diameter 400mm, pile spacing is set at 1.6 meters, and the bearing course at pile end land are at silty clay
On the layer.
As calculated, A
P=0.1256m
2, u
p=1.256m, A=2.56m
2, α=1, n=6, the long L=of stake
=15.5 meters
[0026]Comparing embodiment 1 and embodiment 2 adopt the job practices of this patent to need the preformed pile of 300 diameters just can reach the bearing capacity effect that CFG produced of 400 diameters, and easy construction, fast, environmental protection, energy-conservation.This patent efficiency of construction is 3-5 times of CFG, reduction of erection time greatly.CFG market comprehensive cost is by 600 yuan/m
3Calculate, every kpa bearing capacity needs 0.1256x15.5x600/389.9=2.99 unit/kpa, and this patent preformed pile is by 800 yuan/m
3Calculate, every kpa bearing capacity needs 0.09x15.5x800/374.58=2.97 unit/kpa, and by relatively visible same cost, this patent easy construction, quick, environmental protection, duration are short.
Embodiment 3: certain building design basis bottom surface land is at fill stratum
, require characteristic value of foundation bearing capacity to be not less than 1000k
PaAnd this layer characteristic load bearing capacity f
AkBe 111k
Pa, through this bed thickness of geological mapping (
) be 3.5 meters, the pile side resistance characteristic value that can provide (
) be 12k
Pa, its following each layer soil is respectively mucky soil
, bed thickness (
) be 7 meters, the pile side resistance characteristic value that provides (
) be 10.5k
PaIn close powder fine sand
, bed thickness (
) be 4 meters, the pile side resistance characteristic value that provides (
) be 24.5k
PaClosely knit medium sand
, bed thickness (
) be 6 meters, the pile side resistance characteristic value that provides (
) be 43k
PaClosely knit gravelly sand
, bed thickness (
) be 15 meters, the pile side resistance characteristic value that provides for (
) 64.5k
PaThe end resistance characteristic value that provides (
) be 510k
Pa
For satisfying the requirement for bearing capacity of design, adopt the prestressing force precast square pile of length of side 350mm, pile spacing is set at 1 meter (pile spacing of present embodiment preformed pile is 2.9 times of stake bore dia (or equivalent diameter)), and the bearing course at pile end land are at closely knit gravel layer
Interior 5 meters.
As calculated, A
P=0.1225m
2, u
p=1.4m, A=1m
2, α=1, n=5,
The long L=of stake
=
+
+
+
+
=3.5+7+4+6+5=25.5 rice (stake is long to be 25.5 meters, adopts two joint stakes, 12.5 meters at a joint, 13 meters at another joint).
So, the prefabricated length of side is 350 millimeters in precast yard, the prestressed concrete square pile that stake is long 12.5 and 13 meters, when treating the concrete strength of pile maintenance to designing requirement, be transported to the building site by professional carrier, press 1 meter of pile spacing, two joint stakes are got to the underground composite foundation that forms by professional pile sinking equipment after pile extension connects.
Embodiment 4: certain building design basis bottom surface land is at powder soil horizon
, require characteristic value of foundation bearing capacity to be not less than 250k
PaAnd this layer characteristic load bearing capacity f
AkBe 98k
Pa, through this bed thickness of geological mapping (
) be 2 meters, the pile side resistance characteristic value that can provide (
) be 13.5k
Pa, its following each layer soil is respectively mud
, bed thickness (
) be 3 meters, the pile side resistance characteristic value that provides (
) be 10.5k
PaThe powder fine sand
, bed thickness (
) be 2.5 meters, the pile side resistance characteristic value that provides (
) be 20.5k
PaMedium sand
, bed thickness (
) be 4 meters, the pile side resistance characteristic value that provides (
) be 39k
PaClosely knit gravelly sand
, bed thickness (
) be 9 meters, the pile side resistance characteristic value that provides (
) be 64.5k
Pa
For satisfying the requirement for bearing capacity of design, adopt the prestressing force precast square pile of length of side 250mm, pile spacing is set at 1.2 meters (pile spacing of present embodiment preformed pile is 4.8 times of stake bore dia (or equivalent diameter)), the single pile stake is long 10 meters, do on-the-spot original position load test, obtaining characteristic load bearing capacity through test is the requirement for bearing capacity that 300Kpa. can satisfy the 250kpa of this building designing requirement.
So, the prefabricated length of side is 250 millimeters in precast yard, and the prestressed concrete square pile that stake is long 10 meters is when treating the concrete strength of pile maintenance to designing requirement, be transported to the building site by professional carrier, get to the underground composite foundation that forms by professional pile sinking equipment by 1.2 meters of pile spacings.
Embodiment 5(Comparative Examples): the comparative example 4, adopt CFG to handle same ground,, need 400 diameters through on-the-spot original position load test, the long 12 meters stake of stake just can reach the length of side 250 of this patent, the ground treatment effect of the prestressing force preformed pile that stake is long 10 meters.Adopt every stake of this patent processing method to save 0.1256x12x600-0.0625x10x800=404.32 unit as calculated.Economic effect is obvious.
Embodiment 6: adopt pre-stress fibre plastics muscle (FRP muscle; Fiber Reinforced Polymer) and general fibre plastics muscle make the skeleton of this patent concrete pile, substitute traditional cage of reinforcement, further strengthen the economic performance of this patent.Fiber reinforced plastics bar (FRP muscle) is that a kind of mechanical property is superior, and cheap new material adopts the stake reduction cost 10%～20% of this patent concrete pile of its making than reinforcement fabrication, and economic performance is obvious.
Above embodiment is described preferred implementation of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that the common engineers and technicians in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (4)
1. method of using the solid preformed pile industrial system of prestressed concrete Ground Treatment, it is characterized in that comprising the steps: that (1) makes: in factory, use pretensioned prestressing technology, make the solid preformed pile of prestressed concrete, the solid preformed pile of prestressed concrete is done skeleton by prestressing force master muscle and stirrup, concreting and making, all between 150 centimetres-450 centimetres, the single-unit stake is long between 3 meters-20 meters for the diameter of section of preformed pile, the length of side or equivalent diameter, the length of side; (2) transportation: preformed pile reaches designing requirement by stream curing to concrete strength in factory, after the pile quality passed examination, preformed pile is transported to each building site; (3) construction: at building-site, require behind the measurement and positioning of stake site according to design drawing, the solid preformed pile of prestressed concrete is beaten, pressed or shake with professional construction equipment to be flushed in the foundation soil that needs to handle, form composite foundation by engineers and technicians.
2. a kind of method of using the solid preformed pile industrial system of prestressed concrete Ground Treatment according to claim 1, it is characterized in that between the described preformed pile pile spacing for the 2-10 of stake bore dia or equivalent diameter doubly, the stake position is arranged as equilateral triangle, square or rectangle between the preformed pile.
3. a kind of method of using the solid preformed pile industrial system of prestressed concrete Ground Treatment according to claim 1, the cross section that it is characterized in that described prestressed concrete pile are square, rectangle or circle.
4. a kind of method of using the solid preformed pile industrial system of prestressed concrete Ground Treatment according to claim 1, the bearing capacity that it is characterized in that described composite foundation is the stack of the bearing capacity of the bearing capacity of inter-pile soil and preformed pile, and the characteristic value of foundation bearing capacity of the bearing capacity of composite foundation is calculated by following design formulas:
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101626361A CN103215964A (en) | 2013-05-07 | 2013-05-07 | Method of industrial systematic treatment of foundation through prestressed concrete solid pre-formed piles |
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|---|---|---|---|
| CN2013101626361A CN103215964A (en) | 2013-05-07 | 2013-05-07 | Method of industrial systematic treatment of foundation through prestressed concrete solid pre-formed piles |
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105887941A (en) * | 2015-01-20 | 2016-08-24 | 黄新福 | Pile foundation pile length measuring and calculating method |
| CN106337430A (en) * | 2016-09-05 | 2017-01-18 | 中交四航局第二工程有限公司 | Underwater composite foundation reinforcement treatment method |
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| DE3529430A1 (en) * | 1985-08-16 | 1987-05-07 | Hirsch Josef Dipl Ing Fh | Precast reinforced-concrete piles of assembled individual parts of annular cross-section which are prestressed and grouted after placing by means of suction flushing, deadweight and applied load |
| CN1107194A (en) * | 1994-03-16 | 1995-08-23 | 沙祥林 | Three-dimension high-strength composite foundation |
| CN1224786A (en) * | 1998-12-17 | 1999-08-04 | 何世鸣 | Composite foundation with short piles and its construction process |
| CN1563584A (en) * | 2004-04-09 | 2005-01-12 | 南京大学 | Method for treating soft base of high-grade highway of agitation pile made from concrete soil cement |
-
2013
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Patent Citations (4)
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|---|---|---|---|---|
| DE3529430A1 (en) * | 1985-08-16 | 1987-05-07 | Hirsch Josef Dipl Ing Fh | Precast reinforced-concrete piles of assembled individual parts of annular cross-section which are prestressed and grouted after placing by means of suction flushing, deadweight and applied load |
| CN1107194A (en) * | 1994-03-16 | 1995-08-23 | 沙祥林 | Three-dimension high-strength composite foundation |
| CN1224786A (en) * | 1998-12-17 | 1999-08-04 | 何世鸣 | Composite foundation with short piles and its construction process |
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| Title |
|---|
| 中华人民共和国住房和城乡建设部: "《JGJ79-2012建筑地基处理技术》", 13 August 2012 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105887941A (en) * | 2015-01-20 | 2016-08-24 | 黄新福 | Pile foundation pile length measuring and calculating method |
| CN106337430A (en) * | 2016-09-05 | 2017-01-18 | 中交四航局第二工程有限公司 | Underwater composite foundation reinforcement treatment method |
| CN106337430B (en) * | 2016-09-05 | 2018-09-04 | 中交四航局第二工程有限公司 | A kind of underwater composite foundation stabilization treatment method |
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Application publication date: 20130724 |