CN202073027U - Creep deformation adjustment structure for railway prestressed concrete continuous bridge - Google Patents
Creep deformation adjustment structure for railway prestressed concrete continuous bridge Download PDFInfo
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- CN202073027U CN202073027U CN2011201674130U CN201120167413U CN202073027U CN 202073027 U CN202073027 U CN 202073027U CN 2011201674130 U CN2011201674130 U CN 2011201674130U CN 201120167413 U CN201120167413 U CN 201120167413U CN 202073027 U CN202073027 U CN 202073027U
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- creep deformation
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- prestressed concrete
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Abstract
A creep deformation adjustment structure for a railway prestressed concrete continuous bridge can effectively, flexibly and conveniently perform adjustment for creep deformation, and furthermore has reliable safety. The creep deformation adjustment structure for the railway prestressed concrete continuous bridge comprises a reinforced concrete box girder (10) which is composed of the following components: a top plate (11), a bottom plate (12) and web plates (13,14) at two sides. In the reinforced concrete box girder (10), external prestressed steel beams (20) are respectively provided below the top plate (11) and outside inner walls of the two web plates (13,14). Two ends of each external prestressed steel beam (20) are respectively anchored with two ends of the reinforced concrete box girder (10). One to three steel beam anchoring brackets (15) which closely abut against the inner walls of the web plates (13,14) are separately arranged over the span or along a bridge length direction, wherein each steel beam anchoring bracket (15) has a structure of an anchoring teeth block (15a).
Description
Technical field
The utility model relates to bridge, particularly a kind of creep deformation adjustment structure that is applied to Railway Prestressed Concrete continuous beam (structure just) bridge.
Background technology
Along with greatly developing of China's communication, increasing railroad bridge input is built, bridge is big with its span ability, overall performance is strong for prestressed concrete continuous beam (just structure), stressed rationally, advantage such as easy construction, the favor that has been subjected to the bridge engineering teachers has obtained developing rapidly.Yet because the characteristic properties of concrete material, beams and prestress concrete continuous (structure just) certainly exists creep deformation at Cheng Qiaohou.In recent years, the China Express Railway develop rapidly, high-speed railway has very strict requirement to bridge construction linear.Therefore, the creep deformation of structure becomes restriction large span prestressed concrete continuous beam (structure just) the bridge topmost factor that advances.The ballastless track continuous girder bridge of high-speed railway particularly, these restraining factors are particularly outstanding.In addition, to highway prestressed concrete continuous beam (structure just) bridge, creep deformation also can influence the ride comfort of bridge floor driving.Present domestic large span highway continuous rigid frame all in various degree have a span centre downwarp of creeping, and bigger to the influence of bridge floor driving ride comfort.
At present, domesticly reserve standby steel bundle at most concrete continuous beams (just structure) bridge case beam base plate basically, as the structure generation creep deformation standby steel bundle reserved of stretch-draw then.Yet employing is reserved standby bundle measure at base plate and is had following limitation, and the standby bundle of stretch-draw base plate is not obvious to the effect of the distortion of adjustment structure, and adjustment amount is very limited; Base plate is reserved standby bundle, must need to reserve standby beam hole road, therefore will influence the globality of structure; The steel bundle needs lashing before the standby bundle later stage stretch-draw of base plate, the constructing operation trouble; Because the bending at the bottom of the beam of the standby bundle of base plate, it is unfavorable to structure stress to produce radial load during stretch-draw.
The utility model content
Technical problem to be solved in the utility model provides the continuous bridge creep deformation of a kind of Railway Prestressed Concrete adjustment structure, can be effectively, flexibly and easily the creep deformation adjustment is adjusted, and also safe and reliable.
The technical scheme that its technical problem that solves the utility model adopts is as follows:
The continuous bridge creep deformation of Railway Prestressed Concrete of the present utility model adjustment structure, comprise the reinforced concrete box beam that the web by top board, base plate and both sides constitutes, it is characterized in that: is laid with external prestressing steel bundle near two web inwalls in the described reinforced concrete box beam, each external prestressing steel bundle two ends respectively with the two ends anchor connection of reinforced concrete box beam; Arrange 1-3 the steel bundle anchoring bracket near web at span centre or along suitable bridge to the interval, steel bundle anchoring bracket has tooth-shape structure.
The beneficial effects of the utility model are, adopt this structure force path simple, directly, can effectively adjust the creep deformation of structure later stage; Can regulate the creep deformation of creep arch and downwarp both direction, strengthen the flexibility of control creep deformation; Can be according to the creep deformation of progress of creeping and deflection classification adjustment structure; Avoided reserving standby beam hole road, improved the globality in cross section at the case beam; Adopt external tendon to need not lashing, only need a stretch-draw point during its stretch-draw, improved construct convenience; Can effectively solve a key issue of large span prestressed concrete continuous beam (structure just) bridge, will impel large span prestressed concrete continuous beam (just structure) bridge, particularly Long Span Railway prestressed concrete continuous beam (structure just) bridge to develop to the direction of large span more.
Description of drawings
This manual comprises following two width of cloth accompanying drawings:
Fig. 1 be the continuous bridge creep deformation of the utility model Railway Prestressed Concrete adjustment structure along bridge to the facade structures schematic diagram;
Fig. 2 is the facade structures schematic diagram of the continuous bridge creep deformation of the utility model Railway Prestressed Concrete adjustment structure direction across bridge.
Component shown in the figure, toponym and pairing mark: reinforced concrete box beam 10, top board 11, base plate 12, web 13, web 14, steel bundle anchoring bracket 15, anchoring tooth piece 15a, external prestressing steel bundle 20.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
See figures.1.and.2, the continuous bridge creep deformation of Railway Prestressed Concrete of the present utility model adjustment structure comprises the reinforced concrete box beam 10 that the web 13,14 by top board 11, base plate 12 and both sides constitutes.Described reinforced concrete box beam 10 inherences respectively are laid with external prestressing steel bundle 20 near two webs, 13,14 inboards, each external prestressing steel bundle 20 two ends respectively with the 10 two ends anchor connections of reinforced concrete box beam.Arrange 1-3 the steel bundle anchoring bracket 15 near web 13,14 inwalls at span centre or along suitable bridge to the interval, steel bundle anchoring bracket 15 has anchoring tooth piece 15a structure.
External prestressing steel bundle 20 is arranged in reinforced concrete box beam 10 inside, and 20 end anchorages of external prestressing steel bundle perhaps are anchored in end bay span centre or beam-ends as required in diaphragm top, pier top.The outer prestressed strand 20 of stretch-draw precursor is near top board 11 lower edges.During Construction of continuous beam, near the belly place steel bundle anchoring bracket 15 is set at reinforced concrete box beam 10 according to calculating.Then in external prestressing steel bundle 20 middle parts (Fig. 2 span centre position), use very heavy vertical stretch-draw external prestressing steel bundle 20 downwards when needing to adjust.
Path of Force Transfer is that external prestressing steel bundle 20 is delivered to reinforced concrete box beam 10 middle parts with vertical force by anchoring tooth piece 15a, make reinforced concrete box beam 10 vertical deformation take place to reach the purpose of adjusting the structure creep deformation, this scheme power transmission process is brief, clear and definite, therefore, can effectively adjust malformation.
Be anticorrosion, external prestressing steel bundle 20 can adopt epoxy coating strand.With reference to Fig. 2, described external prestressing steel bundle 20 two ends are anchored in pier top top board 11 respectively, or be anchored in end bay span centre base plate 12 or beam-ends top board 11 more as required, the quantity of described anchoring tooth piece 15a is 1～3, along the 15 vertical staged settings of steel bundle anchoring bracket, so that make things convenient for and adjust neatly the stretching force of external prestressing steel bundle 20 as required.
The concrete grammar of adjusting creep deformation is as follows:
One, if the creep deformation of structure later stage is the span centre downwarp, not stretch-draw external prestressing steel bundle 20 after then early stage, construction was finished only needs the anchored end of external prestressing steel bundle 20 is built in beam body inside, and fixed.When a period of time back rest body downwarp takes place shrinkage and creep, when needs adjust the beam body when linear with the 20 vertical stretch-draw of external prestressing steel bundle (with jack vertical downwards with the stretch-draw point of external prestressing steel bundle 20 downwards the top stretch make external tendon extend purpose with arrival stretch-draw), and be anchored on the anchoring tooth piece 15a of steel bundle anchoring bracket 15.This moment external prestressing steel bundle 20 tensions, the component that vertically makes progress is delivered to the girder span centre by steel bundle anchoring bracket 15 so that displacement upwards takes place girder, reaches to adjust the creep purpose of downwarp of beam body.Can be during enforcement along with the process of shrinkage and creep, big young pathbreaker's external prestressing steel bundle 20 grading tensions according to adjustment amount arrive corresponding position again.After final shrinkage and creep was finished, 20 stretch-draw of external prestressing steel bundle put in place and adopt concrete that external prestressing steel bundle 20 parcels have been reached permanent corrosion-resistant purpose in reinforced concrete box beam 10 webs 13,14 inboards along the position of external prestressing steel bundle 20.
Two, if the creep deformation of structure later stage is span centre arch, then the construction in early stage is finished the just vertical stretch-draw external prestressing steel bundle 20 in back and is anchored in minimum point shown in Figure 2, this moment structure linear absolute altitude according to there being external prestressing steel bundle 20 to do the time spent consideration.Along with the progress of shrinkage and creep, span centre beam body arch, when needs were adjusted, then vertical stretch-draw external prestressing steel bundle 20 also was anchored in time low spot, treated that contraction is crept then all to loosen external prestressing steel bundle 20 after finishing substantially, and can take off and use other bridge.Owing to loosened external prestressing steel bundle 20, made that acting on the power that vertically makes progress in the case girder span reduces, thereby make the purpose that span centre deforms and adjusts the arch of creeping to reach downwards.
The utility model can use on large span prestressed concrete continuous beam or continuous rigid frame bridge, be specially adapted to also can be applied on the high-speed railway prestressed concrete simple supported box beam structure simultaneously on the high-speed railway prestressed concrete continuous beam of linear exigent large span (structure just) bridge construction.
Some principles of the above the continuous bridge creep deformation of the utility model Railway Prestressed Concrete adjustment structure that just explains through diagrams, be not be the utility model to be confined to shown in and in described concrete structure and the scope of application, so every the corresponding modify and equivalent that might be utilized all belongs to the claim that the utility model is applied for.
Claims (3)
1. the continuous bridge creep deformation of Railway Prestressed Concrete adjustment is constructed, comprise reinforced concrete box beam (10) by web (13, the 14) formation of top board (11), base plate (12) and both sides, it is characterized in that: the inherent top board of described reinforced concrete box beam (10) (11) down and two webs (13,14) inwall respectively is laid with external prestressing steel bundle (20) outward, each external prestressing steel bundle (20) two ends respectively with reinforced concrete box beam (10) two ends anchor connection; Arrange 1-3 the steel bundle anchoring bracket (15) near web (13,14) inwall at span centre or along suitable bridge to the interval, steel bundle anchoring bracket (15) has anchoring tooth piece (15a) structure.
2. the continuous bridge creep deformation of Railway Prestressed Concrete as claimed in claim 1 adjustment structure is characterized in that: described external prestressing steel bundle (20) two ends respectively with top board (11) two ends anchor connection.
3. the continuous bridge creep deformation of Railway Prestressed Concrete as claimed in claim 1 or 2 adjustment structure, it is characterized in that: the quantity of described anchoring tooth piece (15a) is 1～3, along the vertical staged setting of steel bundle anchoring bracket (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201674130U CN202073027U (en) | 2011-05-24 | 2011-05-24 | Creep deformation adjustment structure for railway prestressed concrete continuous bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201674130U CN202073027U (en) | 2011-05-24 | 2011-05-24 | Creep deformation adjustment structure for railway prestressed concrete continuous bridge |
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| Publication Number | Publication Date |
|---|---|
| CN202073027U true CN202073027U (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201674130U Expired - Lifetime CN202073027U (en) | 2011-05-24 | 2011-05-24 | Creep deformation adjustment structure for railway prestressed concrete continuous bridge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104746427A (en) * | 2015-03-24 | 2015-07-01 | 湖南大学 | External pre-stressing anchoring structure of ultra-high performance concrete thin-wall box girder |
| CN106638274A (en) * | 2016-12-15 | 2017-05-10 | 湖南大学 | Unidirectional prestressed ultrahigh-performance concrete thin-walled box girder standard segment |
| CN114150565A (en) * | 2021-12-20 | 2022-03-08 | 中铁二院工程集团有限责任公司 | Simplified design method for steering structure of external prestressed concrete box girder |
-
2011
- 2011-05-24 CN CN2011201674130U patent/CN202073027U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104746427A (en) * | 2015-03-24 | 2015-07-01 | 湖南大学 | External pre-stressing anchoring structure of ultra-high performance concrete thin-wall box girder |
| CN106638274A (en) * | 2016-12-15 | 2017-05-10 | 湖南大学 | Unidirectional prestressed ultrahigh-performance concrete thin-walled box girder standard segment |
| CN106638274B (en) * | 2016-12-15 | 2018-04-17 | 湖南大学 | A kind of unidirectional prestressing force ultra-high performance concrete Thin-walled Box Girder standard segment |
| CN114150565A (en) * | 2021-12-20 | 2022-03-08 | 中铁二院工程集团有限责任公司 | Simplified design method for steering structure of external prestressed concrete box girder |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111214 |