CN103726448A - Prestress concrete beam construction tension process - Google Patents
Prestress concrete beam construction tension process Download PDFInfo
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- CN103726448A CN103726448A CN201310708431.9A CN201310708431A CN103726448A CN 103726448 A CN103726448 A CN 103726448A CN 201310708431 A CN201310708431 A CN 201310708431A CN 103726448 A CN103726448 A CN 103726448A
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- prestress
- concrete
- reinforcing steel
- prestressed
- concrete beam
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Abstract
The invention discloses a prestress concrete beam construction tension process which includes the steps of firstly, penetrating a prestress reinforcing steel bar into a steel die; secondly, tensioning the prestress reinforcing steel bar through a jack; thirdly, fixing the prestress reinforcing steel bar on a support pier through a clamp; fourthly, pouring concrete; fifthly, cutting off and loosening the prestress reinforcing steel bar when the strength of the concrete reach more than 75% of the design strength. By the prestress concrete beam construction tension process, prestress is uniformized effectively, and prestress loss is small.
Description
Technical field
The present invention relates to a kind of construction stretching technique of prestressed concrete beam.
Background technology
In the structure of prestressed concrete, the tension stress control of presstressed reinforcing steel, can produce directly impact to prestressed effect, and in structure, effective prestress value is excessive or too small to the stress of structure with use safety all can produce adverse influence apart from design load.
The disease of prestressed concrete beam is mainly downwarp and the cracking of beam body, the particularly downwarp of beam body, this can not display when bridge has just built up and detect and test, but in the stage of coming into operation, owing to there being the effect of traveling load, in bridge span, will produce lasting downwarp, this is all because the excessive loss of prestress causing of effective prestress unevenness is excessive, for effective prestress indication is mainly that in concrete beam, reinforcing bar is subject to the stress after stretch-draw, beam being produced, therefore the quality of prestressed stretch-draw processing quality control, can set up accurately, meet the key of the effective prestress value of designing requirement.
Summary of the invention
The technical problem to be solved in the present invention is to overcome existing defect, and a kind of construction stretching technique of prestressed concrete beam is provided.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
The construction stretching technique of a kind of prestressed concrete beam of the present invention, comprises the following steps:
(1) prestressed reinforcement is placed to fixing punching block;
(2) by jack tension presstressed reinforcing steel;
(3) by fixture, presstressed reinforcing steel is fixed on to buttress;
(4) concrete is built;
(5) until concrete strength, be about 75% when above of design strength, just can cut off, loosen reinforcing bar.
Further, before stretch-draw, check the intensity data of prestressed girder concrete test block, in order to confirm whether modulus of elasticity reaches designing requirement; Confirm requirement when whether concrete strength reaches stretch-draw, and check that template has or not sinkage.
Further, in step (2), during by jack tension presstressed reinforcing steel, adopt the mode of two ends stretch-draw to carry out.
The beneficial effect that the present invention reaches is:
The construction stretching technique of a kind of prestressed concrete beam provided by the invention, effective prestress is even, and loss of prestress is less.
The specific embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
The construction stretching technique of a kind of prestressed concrete beam of the present invention, comprises the following steps:
(1) prestressed reinforcement is placed to fixing punching block;
(2) by jack tension presstressed reinforcing steel;
(3) by fixture, presstressed reinforcing steel is fixed on to buttress;
(4) concrete is built;
(5) until concrete strength, be about 75% when above of design strength, just can cut off, loosen reinforcing bar.
Before stretch-draw, check the intensity data of prestressed girder concrete test block, in order to confirm whether modulus of elasticity reaches designing requirement; Confirm requirement when whether concrete strength reaches stretch-draw, and check that template has or not sinkage.
In step (2), during by jack tension presstressed reinforcing steel, adopt the mode of two ends stretch-draw to carry out.
The construction stretching technique of a kind of prestressed concrete beam provided by the invention, effective prestress is even, and loss of prestress is less.
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. a construction stretching technique for prestressed concrete beam, is characterized in that, comprises the following steps:
(1) prestressed reinforcement is placed to fixing punching block;
(2) by jack tension presstressed reinforcing steel;
(3) by fixture, presstressed reinforcing steel is fixed on to buttress;
(4) concrete is built;
(5) until concrete strength, be about 75% when above of design strength, just can cut off reinforcing bar.
2. the construction stretching technique of a kind of prestressed concrete beam according to claim 1, is characterized in that, before stretch-draw, checks the intensity data of prestressed girder concrete test block, in order to confirm whether modulus of elasticity reaches designing requirement; Confirm requirement when whether concrete strength reaches stretch-draw, and check that template has or not sinkage.
3. the construction stretching technique of a kind of prestressed concrete beam according to claim 1, is characterized in that, in step (2), adopts the mode of two ends stretch-draw to carry out during by jack tension presstressed reinforcing steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310708431.9A CN103726448A (en) | 2013-12-20 | 2013-12-20 | Prestress concrete beam construction tension process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310708431.9A CN103726448A (en) | 2013-12-20 | 2013-12-20 | Prestress concrete beam construction tension process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103726448A true CN103726448A (en) | 2014-04-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310708431.9A Pending CN103726448A (en) | 2013-12-20 | 2013-12-20 | Prestress concrete beam construction tension process |
Country Status (1)
| Country | Link |
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| CN (1) | CN103726448A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2773186A1 (en) * | 1997-12-31 | 1999-07-02 | Jae Man Park | Pre-stressed structural component cable re-tensioner |
| KR101140433B1 (en) * | 2011-08-11 | 2012-04-30 | 삼우건설 주식회사 | Method for fabricating prestressed steel composite girder |
| CN202323717U (en) * | 2011-10-28 | 2012-07-11 | 科达集团股份有限公司 | Cantilever type pre-stress hoop and special tensioning device thereof |
| CN102747677A (en) * | 2012-07-27 | 2012-10-24 | 中铁三局集团有限公司 | Bridge and construction method thereof |
-
2013
- 2013-12-20 CN CN201310708431.9A patent/CN103726448A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2773186A1 (en) * | 1997-12-31 | 1999-07-02 | Jae Man Park | Pre-stressed structural component cable re-tensioner |
| KR101140433B1 (en) * | 2011-08-11 | 2012-04-30 | 삼우건설 주식회사 | Method for fabricating prestressed steel composite girder |
| CN202323717U (en) * | 2011-10-28 | 2012-07-11 | 科达集团股份有限公司 | Cantilever type pre-stress hoop and special tensioning device thereof |
| CN102747677A (en) * | 2012-07-27 | 2012-10-24 | 中铁三局集团有限公司 | Bridge and construction method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 李子桥等: ""高架桥箱梁施工技术及质量检查要点"", 《建筑安全》 * |
| 袁辉等: ""大型预应力混凝土闸墩模型试验预应力加载方法研究"", 《人民珠江》 * |
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Application publication date: 20140416 |