CN100336649C - Method of manufacturing prestressed high strength concrete hollow square pile centrifugal, steam, maintenance method - Google Patents
Method of manufacturing prestressed high strength concrete hollow square pile centrifugal, steam, maintenance method Download PDFInfo
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- CN100336649C CN100336649C CNB2004100407175A CN200410040717A CN100336649C CN 100336649 C CN100336649 C CN 100336649C CN B2004100407175 A CNB2004100407175 A CN B2004100407175A CN 200410040717 A CN200410040717 A CN 200410040717A CN 100336649 C CN100336649 C CN 100336649C
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Abstract
The present invention relates to a foundation pile for the base treatment of construction engineering foundations, such as industrial and civil buildings, highways, railways, harbors, etc., particularly a hollow square pile formed by centrifugal forming and steam curing. The present invention is formed by the processes of centrifugal forming (including three stages-low speed, medium speed and high speed) and steam curing (including autoclave steam curing if necessary). The two processes can shorten the time of molding and curing (the curing time is shortened to 3 days from 28 days of natural curing for delivering out of a factory) to build foundation for enhancing production efficiency, enhance concrete strength and the stability of product quality, and greatly enhance land utilization rate and production efficiency. The whole production processes of the present invention from concrete proportioning to the centrifugal forming are automatically controlled by a microcomputer, which realizes production automation, and enhances the quality of products and production benefit.
Description
Technical field: the present invention relates to a kind ofly be used for industry and handle with architectural engineering foundations such as civil buildings, highway, railway, harbour and use foundation pile, particularly a kind of centrifugal forming that utilizes, steam-cured hollow square pile.Dependent territory wood building engineering field.
Background technology: usually need to make of armored concrete the foundation pile of ground in native water architectural engineering, with pile press machine stake being pressed into becomes foundation pile after underground, allows the top carrying building of foundation pile.When particularly building large-scale or high-rise on the ground of geological structure more complicated, adopting foundation pile to strengthen the basis is present requisite means.Foundation pile can be divided into hollow pile and solid pile by its structure at present; Can be divided into prefabricated and bored concrete pile by the preparation method branch; By being divided into regular reinforcement and deformed bar with steel; Divide by the moulding mode and can be divided into artificial moulding and centrifugal forming etc.China has all stipulated corresponding standard to design, production, the application of this class stake.For example: " Code for design of building " (GB50007-2002) and " pretensioned prestressed concrete pipe pile " (GB13476-1999) etc.But employed precast square pile (no matter solid or hollow) all is to adopt artificial formwork moulding by casting, natural curing to form in the civil construction project ground at home.The defective of this mode of production is: the one, and labor strength is big, and production efficiency is low, and the production cycle is long, is difficult to form large-scale production; The 2nd, the concrete leakiness of building, there is pore the centre, the quality instability, product strength is not high relatively; The 3rd, it is big to take production site, natural curing time long (being no less than 28 days by 97G361 atlas regulation), waste land resource and contaminated environment; The 4th, waste of raw materials is big, the production cost height.
Summary of the invention: the defective that the objective of the invention is to overcome above-mentioned prior art; invent the prestress high intensity concrete hollow square pile that a kind of mode that adopts centrifugal forming and steam curing is made; thereby realize automation, the large-scale production of whole pile foundation stake; reach high-strength concrete, the application of economic arrangement of reinforcement in foundation pile of building; to reach energy-saving and cost-reducing; environmental protection, steady quality is reliable, and remarkable in economical benefits improves.
The objective of the invention is to finish like this: the method for prestress high intensity concrete hollow square pile is made in a kind of centrifugal process steam curing, it is characterized in that whole pile centrifugal forming and carries out steam curing, and its technology comprises:
A, preparatory stage: make steel reinforcement cage, proportioning is made concrete, cleared up centrifugal mold and be coated with separation layer in accordance with regulations;
B, installation steel reinforcement cage: be put in the centrifugal mold steel reinforcement cage of making and the location;
C, mechanical cloth: the concrete for preparing is injected centrifugal mold with mechanical system;
D, matched moulds: close up centrifugal mold, and be fixed with the locating locking bolt from the outside with centrifugal mold, the assurance centrifugal mold can not be opened when rotating;
E, usefulness stretch-draw machine stretch-draw prestressing force rod iron are to increase its prestressing force;
F, centrifugal forming: will fill raw-material centrifugal mold and lift on the centrifuge, start centrifuge and quicken gradually by low speed, middling speed, at a high speed order, under centrifugal action, concrete in the centrifugal mold is (the realization concrete density is more manually poured into a mould and increased substantially) around the center of circle is got rid of laterally with the centrifugal mold axis, finally forms the hollow square pile of square-outside and round-inside or the hollow pile of other profile.
G, steam curing: the whole centrifugal mold that will be enclosed with hollow pile is put into the steam curing pond, injects water vapour maintenance a few hours;
H, the demoulding: open the locating locking bolt of centrifugal mold outside, slough centrifugal mold, take out the hollow pile of moulding;
I, pile: hollow pile was deposited in the open-air atmosphere after natural curing 3-7 days, can dispatches from the factory through being up to the standards.
Described steam curing comprises general water vapour maintenance and autoclave steam maintenance, and general water vapour curing time is approximately 5-9 hour; Best 7 hours.
Described autoclave steam maintenance is: the whole centrifugal mold that will be enclosed with hollow pile is put into autoclave, under high temperature, high pressure and water vapour acting in conjunction, maintenance through about 10-14 hour, (operating pressure in the autoclave is 1MPa, concrete strength＞C80, high temperature are 180 ℃).
The centrifugal forming stage has two stages at least, then slowly runs the eccentric phase: centrifugal rotational speed is 208 rev/mins; Time is 5-20 minute; The high speed rotating eccentric phase; Centrifugal rotational speed is 1400 rev/mins; Time is 5-20 minute; But the centrifugal forming stage preferably includes three phases, and the eccentric phase that then slowly runs, middling speed are rotated eccentric phase and high speed rotating eccentric phase; The centrifugal rotational speed that middling speed is rotated the eccentric phase is 860 rev/mins; Time is 5-20 minute;
The shape of cross section of hollow pile of the present invention is the hollow geometry of square-outside and round-inside.
Described each centrifugal mold of above-mentioned technology is formed, also can the several piece template be formed jointly by two templates usually, and finally the length of each centrifugal mold meets design requirement and gets final product.
When the present invention made whole hollow pile, owing to adopt whole of centrifugation to produce once, the prefabricated pile body concrete after the moulding was evenly closely knit, and the centre does not have the space, constant product quality, intensity height; Steam curing process shortens the production cycle greatly, reduces to take production site and natural curing to the pollution of surrounding environment, reduces labor strength and production cost; Automation, the large-scale production of whole pile foundation stake reach high-strength concrete, the application of economic arrangement of reinforcement in foundation pile of building, can reach energy-saving and cost-reducing, environmental protection, and steady quality is reliable.
Description of drawings: further specify below in conjunction with accompanying drawing, but protection domain is not limited to embodiment---hollow square pile also comprises the hollow pile of other shape.
Fig. 1 makes the method process chart of prestress high intensity concrete hollow square pile for a kind of centrifugal process steam curing of the present invention.
The specific embodiment:
The embodiment of the invention 1: making cross section is the hollow geometry of interior round foreign side, the outside length of side of stake is 200mm-2000mm, hollow pile body is long to be 6-15m (deciding according to the design needs), and its pile body is made up of raw material such as end plate, cuff, prestressed steel bar, stirrup and high-grade (more than the C60) concrete.Manufacture craft is: a rolls steel reinforcement cage on demand, proportioning is made concrete, cleared up centrifugal mold and be coated with separation layer (centrifugal mold length makes in advance according to designing requirement) in accordance with regulations; B, the steel reinforcement cage of making is put in the centrifugal mold and the location; C, the concrete for preparing is distributed in the centrifugal mold with machinery; D, close up centrifugal mold, and be fixed with the locating locking bolt, guarantee that centrifugal mold can not open when high speed rotating from the outside with centrifugal mold; E, usefulness stretch-draw machine stretch-draw prestressing force rod iron are to increase its prestressing force; F, elder generation are by the mode that slowly runs, and (centrifugal rotational speed is 208 rev/mins to start motor; Time is 10 minutes) allow whole centrifugal mold rotate, under centrifugal action, the concrete of centrifugal mold middle part presses to the centrifugal mold outside, and the middle part forms hollow shape gradually; Use the middling speed rotating manner again, the starter motor centrifugal rotational speed is 860 rev/mins; Time is 8 minutes), pile body outside concrete is more closely knit, and the middle part is more hollow; Start the high speed rotating mode at last; (centrifugal rotational speed is 1400 rev/mins to motor; Time is 20 minutes), whole pile body concrete is evenly closely knit, and intermediate hollow portion diameter is equal substantially; G, the whole centrifugal mold that will be enclosed with hollow pile are put into the steam curing pond, inject water vapour maintenance 7 hours (can use the autoclave steam test maintenance in case of necessity); H, open the locating locking bolt of centrifugal mold outside, take out the hollow pile of moulding; I, hollow pile is deposited in open-air atmosphere natural curing a couple of days after, through dispatching from the factory after the assay was approved.
Manufactured goods of the present invention---hollow square pile, in pile driving process, because the native reaction force for pile crown of base, a part of basic soil pours in the hollow tube chamber, and it has reduced the crowded ground effect of foundation pile on the one hand, has increased the accuracy of pile; Strengthened the rubbing surface of foundation pile with base soil on the other hand, under the certain condition of coefficient of friction, rubbing surface is big more, and frictional force is also big more, thereby increases substantially the foundation bearing capacity of single stake.Because the hollow square pile concrete that adopts technology of the present invention to make is evenly closely knit, also increase the bearing capacity of single hollow pile greatly simultaneously, the final quantity of using foundation pile that reduces.
Claims (7)
1, the method for prestress high intensity concrete hollow square pile is made in a kind of centrifugal process steam curing, it is characterized in that whole pile centrifugal forming and carries out steam curing, and its technology comprises:
A, preparatory stage: make steel reinforcement cage, proportioning is made concrete, cleared up centrifugal mold and be coated with separation layer in accordance with regulations;
B, installation steel reinforcement cage: be put in the centrifugal mold steel reinforcement cage of making and the location;
C, mechanical cloth: the concrete for preparing is injected centrifugal mold with mechanical system;
D, matched moulds: close up centrifugal mold, and be fixed with the locating locking bolt from the outside with centrifugal mold, the assurance centrifugal mold can not be opened when rotating;
E, usefulness stretch-draw machine stretch-draw prestressing force rod iron are to increase its prestressing force;
F, centrifugal forming: start centrifuge and allow whole centrifugal mold rotate, under centrifugal action, the concrete of centrifugal mold middle part gets rid of around the centrifugal mold outside, and the middle part forms hollow shape;
G, steam curing: the whole centrifugal mold that will be enclosed with hollow pile is put into the steam curing pond, injects water vapour maintenance a few hours;
H, the demoulding: open the locating locking bolt of centrifugal mold outside, slough centrifugal mold, take out the hollow pile of moulding;
I, pile: hollow pile was deposited in open-air atmosphere after 3～7 days, through dispatching from the factory after the assay was approved;
The centrifugal forming stage has two stages at least, then slowly runs the eccentric phase: centrifugal rotational speed is 208 rev/mins, and the time is 5-20 minute; The high speed rotating eccentric phase: centrifugal rotational speed is 1400 rev/mins, and the time is 5-20 minute.
2, the method for prestress high intensity concrete hollow square pile is made in a kind of centrifugal process steam curing according to claim 1, it is characterized in that described steam curing comprises water vapour maintenance and autoclave steam maintenance, and the water vapour curing time is 5-9 hour.
3, the method for prestress high intensity concrete hollow square pile is made in a kind of centrifugal process steam curing according to claim 1 and 2, it is characterized in that described autoclave steam maintenance is: the whole centrifugal mold that will be enclosed with hollow pile is put into autoclave steam maintenance device, under high temperature, high pressure and water vapor acting, maintenance 10-14 hour, operating pressure in the autoclave is 1MPa, concrete strength＞C80, high temperature are 180 ℃.
4, the method for prestress high intensity concrete hollow square pile is made in a kind of centrifugal process steam curing according to claim 1, it is characterized in that there is three phases in the centrifugal forming stage, then slowly run eccentric phase, middling speed rotated eccentric phase and high speed rotating eccentric phase, and the centrifugal rotational speed that middling speed is rotated the eccentric phase is 860 to change minute; Time is 5-20 minute.
5, the method for prestress high intensity concrete hollow square pile is made in a kind of centrifugal process steam curing according to claim 1, it is characterized in that described each centrifugal mold is made of jointly the several piece template.
6, the method for prestress high intensity concrete hollow square pile is made in a kind of centrifugal process steam curing according to claim 1 and 2, it is characterized in that the shape of cross section that adopts above-mentioned technology to make hollow pile is the hollow body of square-outside and round-inside shape.
7, the method for prestress high intensity concrete hollow square pile is made in a kind of centrifugal process steam curing according to claim 2, it is characterized in that the water vapour curing time is 7 hours.
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| CNB2004100407175A CN100336649C (en) | 2004-09-16 | 2004-09-16 | Method of manufacturing prestressed high strength concrete hollow square pile centrifugal, steam, maintenance method |
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| CNB2004100407175A CN100336649C (en) | 2004-09-16 | 2004-09-16 | Method of manufacturing prestressed high strength concrete hollow square pile centrifugal, steam, maintenance method |
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| CN100336649C true CN100336649C (en) | 2007-09-12 |
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Cited By (3)
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| CN105666646A (en) * | 2016-02-23 | 2016-06-15 | 初明进 | Concrete hollow square pile production process |
| CN105690557A (en) * | 2016-02-23 | 2016-06-22 | 初明进 | Production technique for hollow square concrete pile |
| CN105751359A (en) * | 2016-02-23 | 2016-07-13 | 初明进 | Production process of concrete hollow square pile |
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| CN102979086B (en) * | 2012-12-17 | 2013-09-04 | 青岛兴河建材有限公司 | Prestressed concrete square pile and manufacturing method thereof |
| CN103223694A (en) * | 2013-03-29 | 2013-07-31 | 南通中技桩业有限公司 | Technology for producing novel prestressing hollow square pile |
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| CN105751358A (en) * | 2016-02-23 | 2016-07-13 | 初明进 | Production process of concrete hollow square pile |
| CN105751357A (en) * | 2016-02-23 | 2016-07-13 | 初明进 | Production process of concrete hollow square pile |
| CN105729622A (en) * | 2016-02-23 | 2016-07-06 | 初明进 | Production process of concrete hollow square pile |
| CN107584633A (en) * | 2017-09-29 | 2018-01-16 | 汕头市宏基混凝土构件有限公司 | A kind of autoclave condensation water is applied to the method for concrete tubular pile production |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105666646A (en) * | 2016-02-23 | 2016-06-15 | 初明进 | Concrete hollow square pile production process |
| CN105690557A (en) * | 2016-02-23 | 2016-06-22 | 初明进 | Production technique for hollow square concrete pile |
| CN105751359A (en) * | 2016-02-23 | 2016-07-13 | 初明进 | Production process of concrete hollow square pile |
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| CN1597286A (en) | 2005-03-23 |
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