CN102852280B - The prestressing force precast beam of head shelved by a kind of band - Google Patents
The prestressing force precast beam of head shelved by a kind of band Download PDFInfo
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- CN102852280B CN102852280B CN201210291481.7A CN201210291481A CN102852280B CN 102852280 B CN102852280 B CN 102852280B CN 201210291481 A CN201210291481 A CN 201210291481A CN 102852280 B CN102852280 B CN 102852280B
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Abstract
The prestressing force precast beam of head shelved by a kind of band, including beam body be embedded in beam body as the prestress wire of main muscle, described beam body is provided with the part of stirrup and described stirrup and stretches out the upper surface of described beam body, it is characterized in that described beam-ends is provided with to shelve to take the lead, take the lead and be connected with trapeze cut, described beam body is longitudinally provided with multiple formwork through hole.The present invention adopts reinforced concrete to shelve head, easy construction, and cost is low, good integrity, and meanwhile, the beam-ends breach gradient of the present invention is big, conveniently can arrange inclined stirrup after beam installs, improve the shear behavior of beam-ends.
Description
Technical field
The present invention relates to a kind of building prefabrication beam, particularly relate to the prefabricated secondary beam of prestressing force in a kind of integral precast structure.
Background technology
Integral precast structure construction generally sets prop to undertake construction stage dead load, but when floor height is higher or bottom soil property is poor, stable or the settlement Control difficulty of prop, therefore under construction stage beam, generally prop is not set, dead load load and construction live load undertake by precast beam, and especially the head of shelving of secondary beam must is fulfilled for requirement of strength.The patent declared before this adopts channel-section steel to shelve its cost height of head and makes complexity, and beam-ends down gap place cannot arrangement of reinforcement stirrup, affect the shear behavior of beam-ends, it addition, channel-section steel width is little, poor stability during construction.Do not set pillar under a kind of construction stage beam to directly take on the prefabricated secondary beam of construction stage load and have no report.
Summary of the invention
The technical problem to be solved is in that to overcome the deficiency of above-mentioned prior art, it is provided that a kind of making is simple, cost is low, and the prestressing force precast beam of good stability during construction.
The prestressing force precast beam of head is shelved according to a kind of band provided by the invention, including beam body be embedded in beam body as the prestress wire of main muscle, described beam body is provided with the part of stirrup and described stirrup and stretches out the upper surface of described beam body, the end of described beam body is provided with to shelve and takes the lead, take the lead and be connected with trapeze cut, described beam body is longitudinally provided with multiple formwork through hole, described taking the lead stretches out beam-ends face 100-200mm, take the lead width less than beam body width 50-60mm, take the lead height 100-200mm, the trapezoidal shape hypotenuse of described breach is about 45 ° angles, notch depth 300-400mm, described take the lead in be furnished with the U-shaped reinforcing bar of some horizontal positioned and the vertical stirrup placed, U-shaped reinforcing bar stretches into certain length in beam body, described taking the lead interior is vertically embedded with anti-shear steel plate.
The prestressing force precast beam shelving head according to a kind of band provided by the invention also has following attached technical characteristic:
The end of described beam body is embedded with bent-up bar, and upper surface certain length of taking the lead is exposed in bent-up bar upper end, and two bent-up bars are connected in lower end the shape that takes the shape of the letter U.
Described prestress wire stretches out breach end face certain length, and steel strand wires end is bent into right angle crotch.
Described beam body top is also embedded with the prestress wire adopting pre-tensioning system construction.
Described prestress wire is cased with sleeve pipe at least part of steel strand wires of beam-ends, and described sleeve pipe is embedded in the end of described beam body.
First the prestressing force precast beam shelving head according to a kind of band provided by the invention compared with prior art has the advantage that, the present invention adopts reinforced concrete to shelve head, manufacture, easy construction, cost is low, good integrity, shelves safe and reliable, prop can be saved, significantly facilitate floor construction；Secondly, the beam-ends breach gradient of the present invention is big, conveniently can arrange inclined stirrup after beam installs, improve the shear behavior of beam-ends.
Accompanying drawing explanation
Fig. 1 is the axonometric chart of the present invention
Fig. 2 is the arrangement of reinforcement elevation of the present invention
Fig. 3 is the beam-ends of the present invention and arrangement of reinforcement full-page proof of taking the lead
Fig. 4 is section and the arrangement of reinforcement of the present invention
Fig. 5 is the arrangement of reinforcement section of taking the lead of the present invention
Detailed description of the invention
nullReferring to Fig. 1 to Fig. 5，A kind of band provided in the present invention is shelved in the embodiment of prestressing force precast beam of head，Including beam body 1 be embedded in beam body as the prestress wire 2 of main muscle，The part that described beam body 1 is provided with stirrup 11 and described stirrup 11 stretches out the upper surface of described beam body，The end of described beam body is provided with to shelve takes the lead 3，Take the lead and 3 be connected with trapeze cut 12，Described beam body 1 is longitudinally provided with multiple formwork through hole 13，Described taking the lead 3 stretches out beam-ends face 100-200mm，Take the lead 3 width less than beam body width 50-60mm，Take the lead height 100-200mm，The trapezoidal shape hypotenuse of described breach is about 45 ° angles，Notch depth 300-400mm，Described take the lead in be furnished with the U-shaped reinforcing bar of some horizontal positioned and the vertical stirrup placed，U-shaped reinforcing bar stretches into certain length in beam body，Described taking the lead interior is vertically embedded with anti-shear steel plate.Described shelve to take the lead 3 floow load and construction live load are delivered on girder, temporary support is set without in end, significantly facilitate construction, and trapeze cut 12 is for staying and set in the beam after making the reserved joint bar on girder can extend into whole watering, improve the globality of girder and secondary beam connection.Formwork through hole 13, for arranging the hold item of floor slab formerecting, makes the load of floor can be passed directly on precast beam without setting up landing leg hand cradle, can reduce cost by convenient construction.The described U-shaped reinforcing bar 31 being furnished with some horizontal positioned in 3 and the vertical stirrup 32 placed of taking the lead, U-shaped reinforcing bar 31 stretches into certain length in beam body, described U-shaped muscle 31 is solve the problem that the outer horizontal bar anchorage length of beam is too short, and must stretch into certain length in beam to meet anchorage length requirement.In described 3 concretes of taking the lead, vertical facilities has steel plate 33, described steel plate 33 to be the shearing strength strengthening taking the lead.Notch depth 300-400mm is the horizontal length for breach.
Referring to Fig. 2, Fig. 3, in above-described embodiment that the present invention provides, the end of described beam body is embedded with bent-up bar 4, and 3 upper surface certain lengths of taking the lead are exposed in bent-up bar 4 upper end, and two bent-up bars 4 are connected in lower end the shape that takes the shape of the letter U.Described bent-up bar 4 can as the tension reinforcement of 3 construction stages of taking the lead, again can as the anti-shear reinforcing bar of composite beam operational phase, and it is to improve the anchoring lower ends performance bending up muscle that lower end is linked to be U-shaped.
Referring to Fig. 1 to Fig. 3, in above-described embodiment that the present invention provides, described prestress wire stretches out breach 12 end face certain length, steel strand wires 2 end is bent into right angle crotch, the steel strand wires 2 of right angle crotch can guarantee that there are enough laps of splice with the reinforcing bar that stretches out on girder, improves the globality of primary-secondary beam connection.
Referring to Fig. 2, Fig. 3, in above-described embodiment that the present invention provides, described beam body top is also embedded with the prestress wire 5 adopting pre-tensioning system construction, and beam body upper steel twisted wire 5 plays antiarch when balance bottom steel strand wires 2 are put, makes precast beam top occur without crack.
Referring to Fig. 3, Fig. 4, in above-described embodiment that the present invention provides, described prestress wire 2 is cased with sleeve pipe 21 at least part of steel strand wires of beam-ends, described sleeve pipe 21 is embedded in the end of described beam body, sleeve pipe buried underground by beam end portion steel strand wires 2 can eliminate the bonding of concrete and steel strand wires, thus discharging prestressing force, this local compressive stress that not only can reduce beam-ends is concentrated, avoid beam-ends bottom that crack occurs, moreover it is possible to alleviate the compressive stress superposition of composite beam beam-ends bottom.
Claims (5)
1. the prestressing force precast beam of head shelved by a band, including beam body be embedded in beam body as the prestress wire of main muscle, described beam body is provided with the part of stirrup and described stirrup and stretches out the upper surface of described beam body, it is characterized in that the end of described beam body is provided with to shelve to take the lead, take the lead and be connected with trapeze cut, described beam body is longitudinally provided with multiple formwork through hole, described taking the lead stretches out beam-ends face 100-200mm, take the lead width less than beam body width 50-60mm, take the lead height 100-200mm, the trapezoidal shape hypotenuse of described breach is about 45 ° angles, notch depth 300-400mm, described take the lead in be furnished with the U-shaped reinforcing bar of some horizontal positioned and the vertical stirrup placed, U-shaped reinforcing bar stretches into certain length in beam body, described taking the lead interior is vertically embedded with anti-shear steel plate.
2. precast beam as claimed in claim 1, is characterized in that the end of described beam body is embedded with bent-up bar, and upper surface certain length of taking the lead is exposed in bent-up bar upper end, and two bent-up bars are connected in lower end the shape that takes the shape of the letter U.
3. precast beam as claimed in claim 1, is characterized in that described prestress wire stretches out breach end face certain length, and steel strand wires end is bent into right angle crotch.
4. precast beam as claimed in claim 1, is characterized in that described beam body top is also embedded with the prestress wire adopting pre-tensioning system construction.
5. precast beam as claimed in claim 1, is characterized in that described prestress wire is cased with sleeve pipe at least part of steel strand wires of beam-ends, and described sleeve pipe is embedded in the end of described beam body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210291481.7A CN102852280B (en) | 2012-08-16 | 2012-08-16 | The prestressing force precast beam of head shelved by a kind of band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210291481.7A CN102852280B (en) | 2012-08-16 | 2012-08-16 | The prestressing force precast beam of head shelved by a kind of band |
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| Publication Number | Publication Date |
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| CN102852280A CN102852280A (en) | 2013-01-02 |
| CN102852280B true CN102852280B (en) | 2016-07-13 |
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| CN201210291481.7A Active CN102852280B (en) | 2012-08-16 | 2012-08-16 | The prestressing force precast beam of head shelved by a kind of band |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878837B (en) * | 2015-01-30 | 2018-09-18 | 青岛九屋建筑安装有限公司 | A kind of concrete frame structure system and its assembly method |
| CN104612329A (en) * | 2015-01-30 | 2015-05-13 | 柳忠东 | Prefabricated truss beam |
| CN109914842A (en) * | 2017-12-12 | 2019-06-21 | 中冶建筑研究总院（上海）有限公司 | A kind of concrete floor structure and its reinforcement means with secondary beam |
| CN113863487B (en) * | 2021-08-26 | 2022-11-29 | 江苏华源建筑设计研究院股份有限公司 | Construction process for connecting joints of beam-end steel concrete combined notched beam and primary and secondary beams |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000144905A (en) * | 1998-11-12 | 2000-05-26 | Ohbayashi Corp | Mixed structural beam |
| CN201785941U (en) * | 2010-09-28 | 2011-04-06 | 杨峰 | Pretensioned prestressed reinforced concrete precast beam |
| CN102418400A (en) * | 2010-09-28 | 2012-04-18 | 杨峰 | Pretensioning prestressed reinforced concrete precast beam |
| CN202831390U (en) * | 2012-08-16 | 2013-03-27 | 杨众 | Prestressed precast beam with shelved head |
-
2012
- 2012-08-16 CN CN201210291481.7A patent/CN102852280B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000144905A (en) * | 1998-11-12 | 2000-05-26 | Ohbayashi Corp | Mixed structural beam |
| CN201785941U (en) * | 2010-09-28 | 2011-04-06 | 杨峰 | Pretensioned prestressed reinforced concrete precast beam |
| CN102418400A (en) * | 2010-09-28 | 2012-04-18 | 杨峰 | Pretensioning prestressed reinforced concrete precast beam |
| CN202831390U (en) * | 2012-08-16 | 2013-03-27 | 杨众 | Prestressed precast beam with shelved head |
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| CN102852280A (en) | 2013-01-02 |
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Address after: Jiangdong District Baizhang road 315000 in Zhejiang province Ningbo City Exhibition Center No. 168 28C Applicant after: Yang Zhong Applicant after: Yang Feng Address before: 315000, AUX Road, No. 757 Li RI Road, Yinzhou, Ningbo, Zhejiang, 502 Applicant before: Yang Zhong Applicant before: Yang Feng |
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