CN102852281A - Prestressed precast main beam with laying gaps - Google Patents
Prestressed precast main beam with laying gaps Download PDFInfo
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- CN102852281A CN102852281A CN2012102915326A CN201210291532A CN102852281A CN 102852281 A CN102852281 A CN 102852281A CN 2012102915326 A CN2012102915326 A CN 2012102915326A CN 201210291532 A CN201210291532 A CN 201210291532A CN 102852281 A CN102852281 A CN 102852281A
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Abstract
The invention discloses a prestressed precast main beam with laying gaps. The prestressed precast main beam with the laying gaps comprises a beam body and a prestressed steel strand as a main reinforcement embedded in the beam body. Reinforcements are arranged in the beam body. Parts of the reinforcements stretch out of an upper surface of the beam body. The prestressed precast main beam with the laying gaps is characterized in that an upper part of at least one side of the beam body is longitudinally provided with the multiple laying gaps. Compared with the existing prestressed beam without a gap, the prestressed precast main beam with the laying gaps maintains a carrying capacity in construction thereby reducing the total height of a superposed beam, and at a secondary beam laying position, joint bars and steel plates are embedded in the prestressed precast main beam so that shearing strength of new and old concrete combination surfaces is improved and main and secondary beam combination integrity is improved.
Description
Technical field
The present invention relates to a kind of building prefabricated components, relate in particular to a kind of reinforced concrete precast beam of the employing pretensioned prestressing for building.
Background technology
Traditional prefabricated girder usually adopts the back height that reduces precast beam or stays the way of breach to solve the problem of temporarily shelving of secondary beam construction stage, this method can increase the overall height of superposed beam, or the girder amount of reinforcement can be controlled by the construction stage, when especially under the construction stage beam, not establishing prop, the deck-molding of girder is large, arrangement of reinforcement is large, cause the architectural space clear height to reduce to waste with reinforcing bar, the other published a kind of patent of wearing secondary beam steel strand through hole of in girder, establishing of applicant, can reduce precast beam is put a stage at prestressing force beam stress performance, make also difficulty, a kind ofly stay the part to shelve breach not establish the prefabricated girder of wearing secondary beam steel strand through hole and be intended to address the above problem.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiency of above-mentioned prior art, and a kind of precast beam install and easy construction, prefabricated girder of prestressing force that cost is low of making things convenient for is provided.
According to a kind of prefabricated girder of the prestressing force of shelving breach that has provided by the invention, comprise that Liang Tihe is embedded in the described beam body as the prestress wire of main muscle, be provided with stirrup in the described beam body, the part of described stirrup stretches out in the upper surface of described beam body.Its top of at least one side of described beam body longitudinally is provided with some breach.The horizontal embedding some joint bars that have in the square beam body under the described breach, joint bar exposes the beam sides certain-length, is embedded with at least one anti-shear steel plate in the beam body between described joint bar and breach.
A kind ofly have the prefabricated girder of the prestressing force of shelving breach also to have following attached technical characterictic according to provided by the invention:
Described beam end of body bight is embedded with the angle steel built-in fitting, is welded with anchor bar on the angle steel.
In the described beam body joint bar be vertically place between the steel strand or the steel strand on, the end of at least one side reinforcing bar be the right angle upwards bending be embedded in the beam body side surface, the reinforcing bar outside flushes with beam sides, bar diameter less than
Described anti-shear steel plate stretches into or passes the beam body, and steel plate vertically stretches out beam body side surface certain-length, and the steel plate end is hypotenuse.
At least one side of described anti-shear steel plate is the bending of horizontal right angle, and bending part steel plate external surface is equal with the beam body side surface.
Described beam body upper notch bottom surface or and symmetrical two breach between beam top be equipped with steel strand, steel strand are constructed with pre-tensioning system.
Under breach, be embedded with U-shaped in the described beam body and hang muscle, hang the muscle upper end and expose beam upper surface certain-length.
Described prestress wire as main muscle partly overlaps sleeve pipe is arranged, and sleeve pipe is embedded in beam end.
Described beam-ends bottom is embedded with the additional anticracking power consumption reinforcing bar of certain-length, and reinforcing bar stretches out the beam-ends certain-length.
Described beam top of shelving gap position vertically is embedded with shaped steel or stiffener.
A kind ofly there is the prefabricated girder of the prestressing force of shelving breach compared with prior art to have following advantage according to provided by the invention: at first, precast beam stays the section of setting a trap to shelve breach and compares with unnotched prestressed girder, the construction stage supporting capacity of precast beam can not reduce substantially, thereby can reduce the overall height of superposed beam; Secondly, girder improves the shear strength of the old and new's concrete bonding surface at the secondary beam lay-down position by burying joint bar and steel plate underground, and the globality of primary-secondary beam combination improves; Again, the built-in process that digs out again after the pre-buried form removal of first bending of steel bar concrete anti-shear steel plate not only makes formwork support process oversimplify, and digs out the degree of roughness increase of rear the old and new's concrete bonding surface, and the normal section shear behavior of bonding surface improves; At last, because this method secondary beam is shelved good stability, allow such as design strength, can not establish temporary supporting under the beam, greatly make things convenient for floor height greatly or establish the poor building engineering construction of prop condition.
Description of drawings
Fig. 1 is front view of the present invention
Fig. 2 is arrangement of reinforcement of the present invention
Fig. 3 is section of the present invention and arrangement of reinforcement
Fig. 4 is pre-buried shear resisting board work progress figure of the present invention
The specific embodiment
Referring to Fig. 1 to Fig. 3, in a kind of embodiment that the prefabricated girder of prestressing force of shelving breach arranged that the present invention provides, comprise beam body 1 and be embedded in the described beam body prestress wire 2 as main muscle, be provided with stirrup 11 in the described beam body 1, the part of described stirrup stretches out in the upper surface of described beam body, and described beam body 1 its top of at least one side longitudinally is provided with some breach 12.The horizontal embedding some joint bars 13 that have in the square beam body under the described breach, joint bar 13 exposes the beam sides certain-length, is embedded with at least one anti-shear steel plate 14 in the beam body that described joint bar 13 and breach are 12.The primary-secondary beam junction on beam body 1 top is established breach 12 and is convenient to secondary beam and shelves, but precast beam does not reduce at stressed height of construction stage, thereby reduce the superposed beam overall height, joint bar 13 is linked to be integral body with lower rebar overlap joint and the whole concrete that waters of secondary beam, can greatly improve the overall performance of primary-secondary beam, establish anti-shear steel plate 14 and stretch in the secondary beam as increasing the normal section shear strength of the old and new's concrete bonding surface.
Referring to Fig. 1, Fig. 3, in above-described embodiment that the present invention provides, described beam body 1 upper notch, 12 bottom surfaces or and symmetrical two breach between beam top be equipped with steel strand 3, steel strand are constructed with pre-tensioning system, recurvation square and an antiarch when upper steel twisted wire 3 of avoiding breach 12 can balance bottom steel strand 2 be put make beam top the crack can not occur.
Referring to Fig. 2, in above-described embodiment that the present invention provides, partly overlapping as the prestress wire of main muscle has sleeve pipe 21, sleeve pipe 21 is embedded in beam end, the sleeve pipe 21 of beam-ends bottom part and steel strand 3 cover certain-lengths can be eliminated the bonding of concrete and steel strand 3, and discharge prestressing force, reduce beam-ends and concentrate because of the stress that prestressing force produces, reduce simultaneously the stress stack of superposed beam operational phase under the hogging moment effect.
Referring to Fig. 1, Fig. 2, in above-described embodiment that the present invention provides, the beam-ends bottom is embedded with the additional anticracking power consumption reinforcing bar 5 of certain-length, reinforcing bar 5 stretches out the beam-ends certain-length, anchor into the additional anticracking power consumption reinforcing bar 5 in the post, it is bigger than normal to solve invar twisted wire 3 cover sleeve pipes 21 rear elongation rates, and makes beam problem of cracking ahead of time under the positive bending moment effect, and the additional bar of low-yield can also enter plastic state ahead of time and increase the power consumption of beam-ends " plastic hinge " simultaneously.
Referring to Fig. 1, among the embodiment that the present invention provides, bight, described beam body 1 end is embedded with angle steel built-in fitting 4, be welded with anchor bar on the angle steel, angle steel built-in fitting 4 can with built-in fitting welding on shelving a little on the post, guarantee the stability and security of beam, this built-in fitting can also prevent beam corner crack and damage simultaneously.
Referring to Fig. 2, Fig. 3, among the embodiment that provides among the present invention, described beam top of shelving gap position vertically is embedded with shaped steel or stiffener 16, is for strengthening the compressive strength of the weak area of this resistance to compression in the construction stage.
Claims (10)
1. one kind has the prefabricated girder of the prestressing force of shelving breach, comprise that Liang Tihe is embedded in the described beam body prestress wire as main muscle, be provided with stirrup in the described beam body, the part of described stirrup stretches out in the upper surface of described beam body, it is characterized in that: its top of at least one side of described beam body longitudinally is provided with some breach.The horizontal embedding some joint bars that have in the square beam body under the described breach, joint bar exposes the beam sides certain-length, is embedded with at least one anti-shear steel plate in the beam body between described joint bar and breach.
2. prefabricated girder as claimed in claim 1 is characterized in that described beam end of body bight is embedded with the angle steel built-in fitting, is welded with anchor bar on the angle steel.
As claimed in claim 1 prefabricated girder it is characterized in that in the described beam body joint bar be vertically place between the steel strand or the steel strand on, the end of at least one side reinforcing bar be the right angle upwards bending be embedded in the beam body side surface, the reinforcing bar outside flushes with beam sides, bar diameter less than
4. prefabricated girder is characterized in that described anti-shear steel plate stretches into or pass the beam body as claimed in claim 1, and steel plate vertically stretches out beam body side surface certain-length, and the steel plate end is hypotenuse.
5. prefabricated girder is characterized in that at least one side of described anti-shear steel plate is the bending of horizontal right angle as claimed in claim 1, and bending part steel plate external surface is equal with the beam body side surface.
Prefabricated girder as claimed in claim 1 it is characterized in that described beam body upper notch bottom surface or and symmetrical two breach between beam top be equipped with steel strand, steel strand are constructed with pre-tensioning system.
7. prefabricated girder is characterized in that being embedded with U-shaped in the described beam body under breach hangs muscle as claimed in claim 1, hangs the muscle upper end and exposes beam upper surface certain-length.
8. prefabricated girder is characterized in that described prestress wire as main muscle partly overlaps sleeve pipe is arranged as claimed in claim 1, and sleeve pipe is embedded in beam end.
9. prefabricated girder is characterized in that described beam-ends bottom is embedded with the additional anticracking power consumption reinforcing bar of certain-length as claimed in claim 1, and reinforcing bar stretches out the beam-ends certain-length.
10. prefabricated girder is characterized in that described beam top of shelving gap position vertically is embedded with shaped steel or stiffener as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210291532.6A CN102852281B (en) | 2012-08-16 | 2012-08-16 | A kind of have the prestressing force precast main beam of shelving breach |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210291532.6A CN102852281B (en) | 2012-08-16 | 2012-08-16 | A kind of have the prestressing force precast main beam of shelving breach |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102852281A true CN102852281A (en) | 2013-01-02 |
| CN102852281B CN102852281B (en) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210291532.6A Active CN102852281B (en) | 2012-08-16 | 2012-08-16 | A kind of have the prestressing force precast main beam of shelving breach |
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| CN (1) | CN102852281B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104179251A (en) * | 2014-07-28 | 2014-12-03 | 南京长江都市建筑设计股份有限公司 | Connection joint of primary precast beam and secondary precast beam comprising T-shaped shear-resistant steel plate as well as connection method |
| CN105256891A (en) * | 2015-09-17 | 2016-01-20 | 东南大学 | Prefabricated concrete frame structure with high-strength bottom bars |
| CN105544736A (en) * | 2015-12-02 | 2016-05-04 | 上海欧本钢结构有限公司 | Concrete precast beam and girder connecting structure |
| CN106592865A (en) * | 2016-11-17 | 2017-04-26 | 重庆建工第三建设有限责任公司 | Fabricated type precast concrete lintel |
| CN112458925A (en) * | 2020-12-02 | 2021-03-09 | 中交路桥建设有限公司 | Segment precast beam structure and construction method for splicing and combining bridge thereof |
Citations (6)
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| JP2007023567A (en) * | 2005-07-14 | 2007-02-01 | Ohbayashi Corp | Connection structure of precast concrete beam members, and connection method for the same |
| WO2010131995A1 (en) * | 2009-05-15 | 2010-11-18 | Makarov Andrey Georgievich | Joint assembly of an interfloor connection of the elements of a three-dimensional building frame |
| CN201785941U (en) * | 2010-09-28 | 2011-04-06 | 杨峰 | Pretensioned prestressed reinforced concrete precast beam |
| CN102418401A (en) * | 2010-09-28 | 2012-04-18 | 杨峰 | Pretensioning prestressed reinforced concrete precast beam |
| CN102418400A (en) * | 2010-09-28 | 2012-04-18 | 杨峰 | Pretensioning prestressed reinforced concrete precast beam |
| CN202831386U (en) * | 2012-08-16 | 2013-03-27 | 杨众 | Prestressed prefabricating main beam with laying notches |
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2012
- 2012-08-16 CN CN201210291532.6A patent/CN102852281B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007023567A (en) * | 2005-07-14 | 2007-02-01 | Ohbayashi Corp | Connection structure of precast concrete beam members, and connection method for the same |
| WO2010131995A1 (en) * | 2009-05-15 | 2010-11-18 | Makarov Andrey Georgievich | Joint assembly of an interfloor connection of the elements of a three-dimensional building frame |
| CN201785941U (en) * | 2010-09-28 | 2011-04-06 | 杨峰 | Pretensioned prestressed reinforced concrete precast beam |
| CN102418401A (en) * | 2010-09-28 | 2012-04-18 | 杨峰 | Pretensioning prestressed reinforced concrete precast beam |
| CN102418400A (en) * | 2010-09-28 | 2012-04-18 | 杨峰 | Pretensioning prestressed reinforced concrete precast beam |
| CN202831386U (en) * | 2012-08-16 | 2013-03-27 | 杨众 | Prestressed prefabricating main beam with laying notches |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104179251A (en) * | 2014-07-28 | 2014-12-03 | 南京长江都市建筑设计股份有限公司 | Connection joint of primary precast beam and secondary precast beam comprising T-shaped shear-resistant steel plate as well as connection method |
| CN105256891A (en) * | 2015-09-17 | 2016-01-20 | 东南大学 | Prefabricated concrete frame structure with high-strength bottom bars |
| CN105256891B (en) * | 2015-09-17 | 2018-02-06 | 东南大学 | High-strength bottom muscle Precast Concrete Frame |
| CN105544736A (en) * | 2015-12-02 | 2016-05-04 | 上海欧本钢结构有限公司 | Concrete precast beam and girder connecting structure |
| CN105544736B (en) * | 2015-12-02 | 2018-08-21 | 上海欧本钢结构有限公司 | A kind of connection structure of concrete prefabricated beam and girder steel |
| CN106592865A (en) * | 2016-11-17 | 2017-04-26 | 重庆建工第三建设有限责任公司 | Fabricated type precast concrete lintel |
| CN112458925A (en) * | 2020-12-02 | 2021-03-09 | 中交路桥建设有限公司 | Segment precast beam structure and construction method for splicing and combining bridge thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102852281B (en) | 2015-12-30 |
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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 District, Ningbo, Zhejiang, 502 Applicant before: Yang Zhong Applicant before: Yang Feng |
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