CN101886388B - Pretensioned prestressed concrete polygonal pile and production method thereof - Google Patents
Pretensioned prestressed concrete polygonal pile and production method thereof Download PDFInfo
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- CN101886388B CN101886388B CN201010214287XA CN201010214287A CN101886388B CN 101886388 B CN101886388 B CN 101886388B CN 201010214287X A CN201010214287X A CN 201010214287XA CN 201010214287 A CN201010214287 A CN 201010214287A CN 101886388 B CN101886388 B CN 101886388B
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Abstract
The invention discloses a pretensioned prestressed concrete polygonal pile, which is characterized by comprising a reinforcing cage, wherein a polygonal pile body which is poured by concrete and combined with the reinforcing cage into a whole is arranged outside the reinforcing cage; the polygonal pile body is provided with at least five edges; the center of the polygonal pile body is provided with a central round hole which passes through the whole polygonal pile body; the two ends of the polygonal pile are respectively provided with polygonal end plates; and the two ends of the reinforcing cage are fixedly connected with the polygonal end plates. The invention aims to overcome the defects in the prior art, and provides the pretensioned prestressed concrete polygonal pile which has the advantages of high single pile bearing capacity, high horizontal bend-resistant bearing capacity, high shear resistance, high shock resistance, small loss under construction, material saving, light dead weight, convenient stacking, and difficult damage during lifting, transporting and transferring. The invention also aims to provide a method for producing the pretensioned prestressed concrete polygonal pile.
Description
Technical field
The present invention relates to a kind of Pretensioned prestressed concrete polygonal pile, the invention still further relates to a kind of production method of Pretensioned prestressed concrete polygonal pile.
Background technology
In the middle of the construction work at present there being much employed precast concrete pile foundation, mainly contains the solid side's stake of concrete, concrete hollow square pile, prestressed concrete pipe pile, precast concrete castinplace pile etc.Its main performance shows as follows:
The solid side's stake of precast concrete friction area is big, the bearing capacity performance is good, but it is bigger to exist deadweight, is prone to crack, fracture easily in lifting, transportation, the construction transhipment, and it is too much to consume materials such as concrete, steel when manufacturing.
Castinplace pile receives weather effect bigger; Rainy day can't construct, the construction period can't guarantee; Because castinplace pile, these two kinds of stakes of solid side stake are directly concrete to be filled in the prefabricated reinforcing bar, through natural curing moulding or vibration moulding, its concrete strength generally is lower than C40.The pile concrete resistance to compression and the impervious ability of this explained hereafter are relatively poor, have problems such as durability is relatively poor.Pile quality can not get guaranteeing, and the waste national resources.
There are two kinds of stakes to plant in the market, are respectively prestressed concrete pipe pile and pre-stressed concrete hollow square stake through centrifugal forming.The prestressed concrete pipe pile manufacturing technology of centrifugal forming is very ripe, through the rotation at a high speed on centrifuge of centrifugal pipe die, concrete material is moved along the outer edge moulding of pipe die inner chamber and as high speed centrifugation, is centrifuged into concrete tubular pile at last.Reliable through pile quality behind the centrifugal forming, have the high advantage of concrete strength of pile, but the pile tube smooth outer surface; Size is little; Little with the frictional force of the soil body when under equivalent diameter, making friction pile and using, the single pile bearing capacity of foundation soil that provides is lower, and owing to the bending resistance of thin-wall pipe pile is not high; In many engineerings, be measure all, thereby improved construction costs to enlarge the pile tube external diameter.
Though the prestressed concrete square pile of centrifugal forming is higher than pile tube with the frictional force on ground and bearing capacity; But still the problem that exists some to solve; Low like reinforcement ratio, concrete material four limits that distribute are more, and are middle less; And reinforcing bar skewness, different because of gravity when centrifugal forming, it is relatively poor that four jiaos concrete is difficult to centrifugal closely knit, its mechanical property tension, resistance to compression, bending resistance.
Summary of the invention
The objective of the invention is in order to overcome weak point of the prior art; Provide that a kind of bearing capacity of single pile is high, horizontal anti-bending bearing capacity is good, shear behavior is high, shock resistance is strong; Loss is few in the building, material-saving, from heavy and light, stack convenient, survivable Pretensioned prestressed concrete polygonal pile when hanging stake, transportation, transhipment;
Another object of the present invention provides a kind of method of this method prestressed concrete polygonal pile.
In order to achieve the above object, the present invention adopts following scheme:
A kind of Pretensioned prestressed concrete polygonal pile; It is characterized in that comprising the reinforcing bar cage; At described reinforcing bar cage peripheral hardware the polygon pile body that is formed and be combined into one with the reinforcing bar cage by concrete spouting is arranged, described polygon pile body is at least pentagon, is provided with the center hole that runs through whole polygon pile body at described polygon pile body center; On described polygonal pile two ends, be respectively equipped with the polygon end plate, described reinforcing bar cage two ends are fixedly connected with described polygon end plate.
Aforesaid a kind of Pretensioned prestressed concrete polygonal pile is characterized in that described polygon pile body is the hexagon pile body, and described polygon end plate is a hexagonal plate.
Aforesaid a kind of Pretensioned prestressed concrete polygonal pile; It is characterized in that in its cross section hexagon of described hexagon pile body, having the right angle of two symmetries; Be equipped with stress on other four angles and eliminate circular arc, on described hexagonal plate, be provided with the right angle corresponding with the hexagon pile body.
Aforesaid a kind of Pretensioned prestressed concrete polygonal pile is characterized in that described arc angle θ is 30～120 °, arc radius R5～50mm.
Aforesaid a kind of Pretensioned prestressed concrete polygonal pile is characterized in that described reinforcing bar cage comprises a plurality of main reinforcements, is welded with spiral stirrup on described main reinforcement.
Aforesaid a kind of Pretensioned prestressed concrete polygonal pile is characterized in that described main reinforcement two ends are provided with connector, and its head of said connector is greater than the diameter of main reinforcement.
Aforesaid a kind of Pretensioned prestressed concrete polygonal pile; It is characterized in that being provided with a plurality of combination bore at described polygon end plate; Described combination bore comprises a screw stretch-draw hole and a heavy muscle hole; Between described screw stretch-draw hole and heavy muscle hole, be provided with the muscle groove, its head of main reinforcement inserts screw stretch-draw orifice ring and after passing the muscle groove, is connected on the heavy muscle.
A kind of production method of Pretensioned prestressed concrete polygonal pile, it may further comprise the steps:
A) earlier that corresponding polygonal pile mold cleaning is clean, coat interleaving agent;
B) the reinforcing bar cage is hung in polygonal lower mold body; The polygon end plate that connects the shirt rim is installed on the reinforcing bar cage two ends, and elder generation penetrates in the screw stretch-draw hole rotating polygon end plate with the main reinforcement head of reinforcing bar cage during installation; Again main reinforcement is packed in the heavy muscle hole; At last mounted reinforcing bar cage one end is connected with fixed head, the other end fixes with the stretch-draw anchor slab, with stretching screw two ends is coupled together respectively at last;
C) the polygon lower mold body with first-class reinforcing cage hangs below concrete mixer, and the concrete material that premixing is good is put into mould; The upper die body that closes is locked the lock screw on the upper and lower mould;
D) mould of first-class screw level is in the lump put well, the reinforcing bar cage is answered limit stretch-draw in advance;
E) mould one that stretch-draw is good is put centrifuge and is carried out centrifugal forming, after the moulding the surplus pulp-water of inwall is toppled over totally;
F) above-mentioned mould is hung in carry out stream curing in the stream curing pond, vapor (steam) temperature is 80 ℃, and curing time is more than 4 hours, and stream curing finishes after-bay, and form removal forms finished product;
The polygonal pile load facility that g) will form finished product carries out the indirect steam maintenance, and vapor (steam) temperature is 180～210 ℃, and steam pressure is more than 0.9Mpa, and the time is 8～10 hours, promptly gets final products.
In sum, the present invention with respect to its beneficial effect of prior art is:
1, because this technology is to adopt centrifugal forming, and its pile concrete density is good, and strength grade is higher, more than C60～C80, thereby durability has improved greatly;
2, because the outside is a polygon, and its effective cross-sectional area is bigger, bearing capacity of single pile is high; Its effective length and cushion cap can correspondingly reduce when design, thereby have improved its economic performance, have practiced thrift fund greatly;
What 3, adopt owing to polygonal pile is general is the length of side of double number, and like hexagonal piles, its arrangement of reinforcement and concrete are evenly distributed, and its whole stress surface is balanced, is difficult for causing local fatigue to damage, and can further be protected than other kind service life;
4, because polygonal pile is more even on arrangement of reinforcement and concrete distribute, be much higher than other kind aspect uplift resistance, compressive resistance, the shearing resistance, in the design with use above many;
5, manufacture craft is advanced, the overall dimensions rule, and the length of side is unrestricted, adopts 150～1000mm usually, and it is produced and adopts centrifugal molding process, and pile quality is high, and pile body integrity is good, and the pile body mechanical property is good, and stake is adopted welding or mechanical connection with being connected of stake.And from heavy and light, transportation, stacking are conveniently, and be not fragile when lifting, transportation, transhipment, good economy performance;
Description of drawings
Fig. 1 is a schematic perspective view of the present invention;
Fig. 2 is a phantom drawing of the present invention;
Fig. 3 is the generalized section of main reinforcement in combination bore;
Fig. 4 is the partial schematic diagram of this Fig. 2.
The specific embodiment
Below in conjunction with the description of drawings and the specific embodiment the present invention is further described:
A kind of Pretensioned prestressed concrete polygonal pile shown in Fig. 1 to 4; Comprise reinforcing bar cage 1; Described reinforcing bar cage 1 comprises a plurality of main reinforcements 12; On described main reinforcement 12, be welded with spiral stirrup 11, described main reinforcement 12 its heads are greater than the diameter of main reinforcement 12, outside described reinforcing bar cage 1, are provided with the polygon pile body 2 that is formed and be combined into one with reinforcing bar cage 1 by concrete spouting; Described polygon pile body 2 is at least five limits; Be provided with the center hole 3 that runs through whole polygon pile body 2 at described polygon pile body 2 centers, on described polygon pile body 2 two ends, be respectively equipped with polygon end plate 4, described reinforcing bar cage 1 two ends are fixedly connected with described polygon end plate 4.
Be provided with a plurality of combination bore 42 at described polygon end plate 4 among the present invention; Described combination bore 42 comprises a screw stretch-draw hole 421 and a heavy muscle hole 422; Between described screw stretch-draw hole 421 and heavy muscle hole 422, be provided with muscle groove 423, main reinforcement 12 its heads insert and were connected on the heavy muscle hole 422 after screw stretch-draw hole 421 hoops passed muscle groove 423.
The production method of Pretensioned prestressed concrete polygonal pile of the present invention, it may further comprise the steps:
Earlier that corresponding polygonal pile mold cleaning is clean, coat interleaving agent;
The reinforcing bar cage is hung in polygonal lower mold body; The polygon end plate that connects the shirt rim is installed on the reinforcing bar cage two ends, and elder generation penetrates in the screw stretch-draw hole rotating polygon end plate with the main reinforcement head of reinforcing bar cage during installation; Again main reinforcement is packed in the heavy muscle hole; At last mounted reinforcing bar cage one end is connected with fixed head, the other end fixes with the stretch-draw anchor slab, with stretching screw two ends is coupled together respectively at last;
The polygon lower mold body of first-class reinforcing cage is hung below concrete mixer, and the concrete material that premixing is good is put into mould; The upper die body that closes is locked the lock screw on the upper and lower mould;
The mould of first-class screw level is in the lump put well, the reinforcing bar cage is answered limit stretch-draw in advance;
The mould one that stretch-draw is good is put centrifuge and is carried out centrifugal forming, after the moulding the surplus pulp-water of inwall is toppled over totally;
Above-mentioned mould hung in carry out stream curing in the stream curing pond, vapor (steam) temperature is 80 ℃, and curing time is more than 4 hours, and stream curing finishes after-bay, and form removal forms finished product, and the concrete strength of this moment can reach about 60Mpa;
The polygonal pile load facility that forms finished product is carried out the indirect steam maintenance; Vapor (steam) temperature is 180～210 ℃, and steam pressure is more than 0.9Mpa, and the time is 8～10 hours; Promptly form a kind of high-intensity concrete products, the concrete strength of this moment can reach more than the 90Mpa.
The Pretensioned prestressed concrete polygonal pile that the present invention produces is specially hollow hexagonal piles, and there is hexagonal plate at two, and the center is an open circles in the hexagonal plate, and end plate is provided with heavy muscle hole and stretch-draw hole, and thickness of slab is 18mm.Two end plates links with reinforcing cage, and reinforcing cage is made up of after roll welding the reinforcing bar of equal length.The used main muscle of reinforcing cage is a prestressed steel bar.Be used to make the prestressed centrifugally concrete hexagonal piles.The two ends plate has the parcel of the common iron plate of 2mm to play the shirt rim effect with the reinforcing cage direction, and the reinforcing cage that connects end plate is put into the hexagon mould, penetration concrete in mould; Carry out stretch-draw after closing upper and lower mould tightly, put into centrifugal forming on the centrifuge, whole centrifuging process is divided into low speed, low-medium speed, middling speed, four processes of high speed; Behind centrifugal the finishing; It is clean that moisture content after centrifugal squeezing is tilted, and gang mould is put into stream curing pond maintenance four hours together, and vapor (steam) temperature is 85 ℃; Form an outer hexagon, inner chamber is the circular centrifugal stake of hexagon.This moment, concrete strength was 65Mpa, and concrete ductility is best this moment, as must further improving concrete strength, can continue to carry out maintenance with a kind of container of high temperature high voltage resistant, was commonly called as still kettle.Pressure is adjusted into 0.95Map, and the time is 8 hours, and hexagonal piles concrete strength at this moment can reach about 95Mpa, promptly gets this product.Can dispatch from the factory after cooling and transport the building site injection to.
Pretensioned prestressed concrete polygonal pile and prestressed centrifugally concrete square pile, pile tube, hollow square pile, solid side stake that the present invention produces are contrasted, and its comparative result is as shown in the table:
| Performance | Polygonal pile L300 (300) | Offcenter squared pile L300 (180) | Pile tube Φ 300 (70) | Solid side's stake L300 | Castinplace pile Φ 300 |
| Bearing capacity of |
1 | 0.51 | 0.41 | 0.63 | 0.57 |
| |
1 | 0.4 | 0.32 | 0.52 | 0.43 |
| The pile body |
1 | 0.44 | 0.31 | 0.42 | 0.33 |
| The cushion |
1 | 0.49 | 0.55 | 0.49 | 0.55 |
| Pile body |
1 | 1 | 0.75 | 1.2 | 1.2 |
| The |
1 | 0.44 | 0.31 | 0.55 | 0.43 |
From table, can analyze, its correlated performance analysis of pretensioning prestressed concrete hexagonal piles that the present invention produces is following:
1, under the equal length of side or the equivalent diameter situation, the solid side's stake of hexagonal piles structural bearing force rate, pile tube height can be found from relevant criterion and standard, and the pile body structural bearing capacity of 300 hexagonal piles is equivalent to hollow square pile 450, is equivalent to 550 of pile tube
2, under the equal length of side or the equivalent diameter situation, hexagonal piles bearing capacity of foundation soil analogy stake, pile tube height can be found from relevant criterion and standard, and the bearing capacity of foundation soil of 300 hexagonal piles is equivalent to hollow square pile 4 and is equivalent to 550 of pile tube
3, under the equal length of side or the equivalent diameter situation; Hexagonal piles flexural strength analogy stake, pile tube height; Can find from relevant criterion and standard, the length of side is the hollow square pile that the flexural strength of the hexagonal piles of 300mm is equivalent to length of side 450mm, is equivalent to the pile tube of external diameter 550mm.
4, under the equal length of side or the equivalent diameter situation, the hexagonal piles concrete amount is littler than solid side's stake, castinplace pile;
5, under the equal length of side or the equivalent diameter situation, the hexagonal piles amount of reinforcement is littler than solid side's stake, castinplace pile.
Claims (6)
1. the production method of a Pretensioned prestressed concrete polygonal pile; Comprise reinforcing bar cage (1); Outside described reinforcing bar cage (1), be provided with the polygon pile body (2) that forms and be combined into one with reinforcing bar cage (1) by concrete spouting; Be provided with the center hole (3) that runs through whole polygon pile body (2) at described polygon pile body (2) center; On described polygon pile body (2) two ends, be respectively equipped with polygon end plate (4), described reinforcing bar cage (1) two ends are fixedly connected with described polygon end plate (4); Described polygon pile body (2) is the hexagon pile body, and described polygon end plate (4) is a hexagonal plate; It is characterized in that producing this polygonal pile may further comprise the steps:
A, earlier that corresponding polygonal pile mold cleaning is clean coats interleaving agent;
B, the reinforcing bar cage is hung in polygonal lower mold body; The polygon end plate that connects the shirt rim is installed on the reinforcing bar cage two ends, and elder generation penetrates in the screw stretch-draw hole rotating polygon end plate with the main reinforcement head of reinforcing bar cage during installation; Again main reinforcement is packed in the heavy muscle hole; At last mounted reinforcing bar cage one end is connected with fixed head, the other end fixes with the stretch-draw anchor slab, with stretching screw two ends is coupled together respectively at last;
C, the polygon lower mold body of first-class reinforcing bar cage is hung below concrete mixer, the concrete material that premixing is good is put into mould; The upper die body that closes is locked the lock screw on the upper and lower mould;
D, the mould of first-class screw level is in the lump put well, the reinforcing bar cage is answered limit stretch-draw in advance;
E, the mould that stretch-draw is good are put centrifuge and are carried out centrifugal forming, after the moulding the surplus pulp-water of inwall are toppled over totally;
F, above-mentioned mould hung in carry out stream curing in the stream curing pond, vapor (steam) temperature is 85 ℃, and curing time is 4 hours, and stream curing is intact, and form removal forms an outer hexagon, and inner chamber be centrifugal of a circular hexagon, and concrete strength is 65Mpa at this moment;
G, will form pack into the still kettle of high temperature high voltage resistant of the centrifugal stake of hexagon and carry out the indirect steam maintenance, vapor (steam) temperature is 180-210 ℃, and steam pressure is 0.95Mpa, and the time is 8 hours, and the concrete strength of hexagonal piles this moment reaches 95Mpa, promptly gets final products.
2. the production method of a kind of Pretensioned prestressed concrete polygonal pile according to claim 1; It is characterized in that in its cross section hexagon of described hexagon pile body (2), having the right angle (21) of two symmetries; Be equipped with stress on other four angles and eliminate circular arc (22), on described hexagonal plate (4), be provided with the right angle (41) corresponding with hexagon pile body (2).
3. the production method of a kind of Pretensioned prestressed concrete polygonal pile according to claim 2 is characterized in that described arc angle θ is that 30～120 °, arc radius R are 5～50mm.
4. the production method of a kind of Pretensioned prestressed concrete polygonal pile according to claim 1 is characterized in that described reinforcing bar cage (1) comprises a plurality of main reinforcements (12), is welded with spiral stirrup (11) on described main reinforcement (12).
5. the production method of a kind of Pretensioned prestressed concrete polygonal pile according to claim 4 is characterized in that described main reinforcement (12) two ends are provided with connector (121), and its head of said connector is greater than the diameter of main reinforcement (12).
6. the production method of a kind of Pretensioned prestressed concrete polygonal pile according to claim 5; It is characterized in that being provided with a plurality of combination bore (42) at described polygon end plate (4); Described combination bore (42) comprises a screw stretch-draw hole (421) and a heavy muscle hole (422); Between described screw stretch-draw hole (421) and heavy muscle hole (422), be provided with muscle groove (423), its head of main reinforcement (12) inserts and was connected on the heavy muscle hole (422) after screw stretch-draw hole (421) hoop passed muscle groove (423).
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| CN102337741A (en) * | 2011-08-17 | 2012-02-01 | 上海奥米制药装备有限公司 | Square-prismatic tube pile and processing method thereof |
| CN103498470B (en) * | 2013-09-26 | 2015-08-19 | 河海大学 | A kind of hexagon precast energy pile and preparation method thereof |
| CN112127358A (en) * | 2019-03-29 | 2020-12-25 | 天海钢棒(张家港)有限公司 | Processing method of precast concrete pile and precast concrete pile |
| CN112659352A (en) * | 2020-03-19 | 2021-04-16 | 王郁东 | Prestressed concrete cluster pipe pile processing technology |
| CN112482371B (en) * | 2020-12-18 | 2022-05-10 | 郑州大学综合设计研究院有限公司 | Anchor tensioning device for integrated tubular pile |
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