CN1061121C - Method for construction of transverse tension prestress concrete beam - Google Patents
Method for construction of transverse tension prestress concrete beam Download PDFInfo
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- CN1061121C CN1061121C CN 95111489 CN95111489A CN1061121C CN 1061121 C CN1061121 C CN 1061121C CN 95111489 CN95111489 CN 95111489 CN 95111489 A CN95111489 A CN 95111489A CN 1061121 C CN1061121 C CN 1061121C
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- concrete
- prestressed reinforcement
- girder
- steel bar
- prestressed
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Abstract
The present invention belongs to the technical field of building construction components, which discloses a method for the construction of transverse tension prestressed concrete beams. The present invention comprises the steps that a. a common steel bar framework is bound, a main concrete beam is poured, and both ends of a prestressed steel bar extend into the main concrete beam to form a whole with a beam body, wherein the middle section of the steel bar is completely disengaged from the beam body; b. a stretching device in a direction which is vertical to the direction of an axis of the beam is arranged on the prestressed steel bar, and vertical force is applied to the prestressed steel bar, so that the concrete beam body obtains required prestressing; c. the position of the prestressed steel bar is fixed by fixing members, the stretching device is disassembled, a lower flange structural steel bar is bound, and concrete at the upper part of the lower flange is poured for the second time, so that the prestressed steel bar and the main concrete beam become a whole.
Description
The invention belongs to the building structural element technical field, relate in particular to a kind of method for construction of transverse tension prestress concrete beam.
In the prior art, prestress concrete beam is prestressed reinforcement of tensioning longitudinally all, its job practices commonly used has two kinds: a kind of is pre-tensioning system, generally only be applicable to medium and small member, its prestressing techniques is simple relatively, but require special prefabricated place, need be transported to building site and hoisted in position after member is made, its scope of application is narrow; Another kind is a post stretching, the concrete beam that is usually used in cast-in-site, when making, must finish pore-forming, clear hole, reeve, complicated prestressing techniqueses such as stretch-draw, anchoring, grouting, sealing off and covering anchorage, it is bigger that required steel using amount is strengthened in the following part of ground tackle and anchor, and plant that need be large complicated, difficulty of construction is big, the cost of production height, and efficient is low.
The object of the present invention is to provide a kind of construction technology and equipment needed thereby simple, can save material service-strong method for construction of transverse tension prestress concrete beam.
Purpose of the present invention realizes with following technical step: a. colligation plain bars skeleton, prestressed reinforcement is arranged in girder beam rib both sides on request, cast girder concrete, the two ends of prestressed reinforcement are stretched in the girder concrete becomes integral body with the beam body, and the stage casing of prestressed reinforcement and beam body break away from fully; B. the tensioning equipment of installation and beam axis normal direction on prestressed reinforcement is the counter-force pressure-bearing surface with the girder bottom surface, and prestressed reinforcement is applied vertical force and makes the beam body obtain required prestressing force; C. with the fixing position of prestressed reinforcement of fixture, the removal tensioning equipment, colligation bottom flange distributing bar is poured into a mould concrete in the groove of bottom flange for the second time, makes prestressed reinforcement and girder concrete become integral body; The installation of described tensioning equipment is to be with the pull bar of inverted concave steel parts to catch on prestressed reinforcement by two upper ends, the pull bar lower end of the upper end band steel part of falling the concavity is passed the preformed hole and the respective aperture on cross member and the reaction beam of concrete lower flange of girder edge and is fixed on the reaction beam, withstand the bottom surface of concrete beam body above the cross member, below the cross member and between the reaction beam jack is set.The pull bar that drives the upper end band steel part of falling the concavity by jack pushing tow reaction beam is descending, the position of the change in location before making prestressed reinforcement by stand under load behind the stand under load.
The good effect that the present invention has is: the present invention is the counter-force pressure-bearing surface with the girder bottom surface, prestressed reinforcement is made transverse stretching, to concrete beam body be subjected to by eccentricity pressure and reverse concentrated force produces with using stand under load prestressed double action, the calculating of 30 meters standards being striden the high-grade highway bridge girder in footpath shows, under the condition of identical prestressing force effect, transverse stretching power is equivalent to 1/10th of the vertical stretching force of conventional prestress concrete beam approximately, and prestressed reinforcement can be saved 20% (can increase nonprestressed reinforcement and satisfy ultimate strength).The present invention has saved the more necessary complicated technologies of existing prestress concrete beam technology, simplified tensioning equipment, reduced requirement to construction, can save ground tackle, bellows and part reinforcing bar, at good usability, the economy of materials and the simplification of construction three aspects have reached better unification.
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail:
Fig. 1 is an enforcement structural representation of the present invention
Fig. 2 is I-I sectional view of Fig. 1
Fig. 3 is the A district enlarged drawing of Fig. 1
Fig. 4 is I-I profile of Fig. 3
Part 1 is to water the concrete girder earlier, and part 2 is prestressed reinforcements, part 2 ' and be the position of prestressed reinforcement 2 before the stand under load, part 3 is pull bars of the upper end band steel part of falling the concavity, part 4 waters concrete in the groove of bottom flange after being, part 5 is cross members, and part 6 is reaction beams, part 7 is jack, and part 8 is fixtures, a
1Be from theoretical supporting-point to prestressed reinforcement and the distance of the burble point of concrete beam body, a
2Be distance from the burble point of prestressed reinforcement and concrete beam body to load(ing) point, a
3Be the distance of two load(ing) points, f is the distance before and after the prestressed reinforcement stand under load, and p is for setting vertical loading position
As shown in the figure, prestressed reinforcement 2 can adopt the intensity height, the steel strand that adhesive property is good, a
1.a
2.a
3And the size of f all should be calculated definite according to the desired prestressing force degree of service load, the present invention implements with following technical step: a. colligation plain bars skeleton, prestressed reinforcement 2 is arranged in girder beam rib both sides on request, pour concrete girder 1, the two ends of prestressed reinforcement are stretched in the concrete girder 1 becomes integral body with the beam body, and the stage casing of prestressed reinforcement 2 and beam body break away from fully; B., tensioning equipment with beam axis normal direction is installed in the position of the load(ing) point p of prestressed reinforcement 2, is the counter-force pressure-bearing surface with concrete girder 1 bottom surface, and prestressed reinforcement 2 is applied vertical force and makes the beam body obtain required prestressing force; C. use the fixedly position of prestressed reinforcement 2 of fixture 8, the removal tensioning equipment, colligation bottom flange distributing bar is poured into a mould concrete 4 in the groove of bottom flange for the second time, makes prestressed reinforcement 2 and concrete girder 1 become integral body; The installation of described tensioning equipment is to be with the pull bar 3 of the steel parts of falling the concavity to catch on prestressed reinforcement 2 by two upper ends, the lower end of the pull bar 3 of the upper end band steel part of falling the concavity is passed the preformed hole and the respective aperture on cross member 5 and the reaction beam 6 of concrete lower flange of girder edge and is fixed on the reaction beam 6, withstand the bottom surface of concrete girder 1 above the cross member 5, below the cross member 5 and between the reaction beam 6 jack 7 is set.The pull bar 3 that drives the upper end band steel parts of falling the concavity by jack 7 pushing tow reaction beams 6 is descending, makes prestressed reinforcement 2 by the position of the change in location before the stand under load behind the stand under load.The present invention will produce in concrete construction verification and stride the footpath is 30 meters said structure concrete simply supported girder bridge, and except that can be used for simply supported beam, its method also can be used for other building structure.
Claims (2)
1. method for construction of transverse tension prestress concrete beam, it is characterized in that: a. colligation plain bars skeleton, prestressed reinforcement (2) is arranged in girder beam rib both sides on request, pour concrete girder (1), the two ends of prestressed reinforcement are stretched in the concrete girder (1) becomes integral body with the beam body, and the stage casing and the beam body of prestressed reinforcement (2) break away from fully; B., tensioning equipment with beam axis normal direction is installed in the position of the load(ing) point p of prestressed reinforcement (2), is the counter-force pressure-bearing surface with concrete girder (1) bottom surface, and prestressed reinforcement (2) is applied vertical force and makes the beam body obtain required prestressing force; C. use the fixedly position of prestressed reinforcement (2) of fixture (8), the removal tensioning equipment, colligation bottom flange distributing bar is poured into a mould concrete (4) in the groove of bottom flange for the second time, makes prestressed reinforcement (2) and concrete girder (1) become integral body.
2. method for construction of transverse tension prestress concrete beam according to claim 1, the installation that it is characterized in that tensioning equipment is to be with the pull bar (3) of the steel parts of falling the concavity to catch on prestressed reinforcement (2) by two upper ends, pull bar (3) lower end of the upper end band steel part of falling the concavity is passed the preformed hole and the respective aperture on cross member (5) and the reaction beam (6) of concrete lower flange of girder edge and is fixed on the reaction beam (6), withstand the bottom surface of concrete beam body (1) above the cross member (5), below the cross member (5) and between the reaction beam (6) jack (7) is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95111489 CN1061121C (en) | 1995-09-08 | 1995-09-08 | Method for construction of transverse tension prestress concrete beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95111489 CN1061121C (en) | 1995-09-08 | 1995-09-08 | Method for construction of transverse tension prestress concrete beam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1127824A CN1127824A (en) | 1996-07-31 |
| CN1061121C true CN1061121C (en) | 2001-01-24 |
Family
ID=5078777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95111489 Expired - Fee Related CN1061121C (en) | 1995-09-08 | 1995-09-08 | Method for construction of transverse tension prestress concrete beam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1061121C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735653A (en) * | 2014-12-09 | 2016-07-06 | 东北林业大学 | Novel bamboo and wood continuous beam prestressing force exertion system |
| CN105220623B (en) * | 2015-10-13 | 2017-01-25 | 吉林大学 | Simply support T-beam strengthening method based on transverse tensioned prestressing, and anchor device |
| CN106592867B (en) * | 2016-12-26 | 2019-01-25 | 中国化学工程第三建设有限公司 | A kind of method of construction of reinforced beam |
| CN107034777A (en) * | 2017-04-28 | 2017-08-11 | 金梁复材（北京）科技有限公司 | A kind of multi-hole beam and rear prestressing force foot bridge |
| CN107984610B (en) * | 2017-11-22 | 2019-10-25 | 武汉大学 | A kind of prestressing force small box girder production method |
| CN112012112B (en) * | 2020-09-15 | 2022-05-03 | 中铁二十三局集团第三工程有限公司 | Construction method for asynchronous cradle of corrugated steel web cast-in-place cantilever box girder |
-
1995
- 1995-09-08 CN CN 95111489 patent/CN1061121C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1127824A (en) | 1996-07-31 |
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