CN105862601B - A kind of method that T structures bridge reduces hogging moment - Google Patents
A kind of method that T structures bridge reduces hogging moment Download PDFInfo
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- CN105862601B CN105862601B CN201610319495.3A CN201610319495A CN105862601B CN 105862601 B CN105862601 B CN 105862601B CN 201610319495 A CN201610319495 A CN 201610319495A CN 105862601 B CN105862601 B CN 105862601B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
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Abstract
The invention discloses a kind of method that T structures bridge reduces hogging moment, in the design phase, calculated according to the setting decreasing value of girder hogging moment at the counter-force design load of abutment pier bearing and main pier and push up design load, up displacement design load s is calculated according to the upper top design loadDesign；In the construction stage, according to the construction error of T structure bridge cantilever end height, the up displacement design load s is correctedDesign, obtain and actually push up shift value sIt is actual, shift value s is actually pushed up according to describedIt is actualIt is determined that actually top loading carries F, the actually top loading load F is then applied in the T structures bridge cantilever end using jack, and the T structures bridge is met the requirement of bridge linear.Present invention decreases the hogging moment of girder at bridge pier, reasonable stress, saves material；The appropriate counter-force for adding abutment pier bearing, can effectively prevent abutment pier seat empty and drop；The sagging deflections of construction middle girder are efficiently solved, improve road-ability.
Description
Technical field
The present invention relates to a kind of T structures bridge construction method, more particularly to a kind of method of T structures bridge reduction hogging moment.
Background technology
T structure bridges are a types of rigid frame bridge, have cantilever force feature, can use cantilever-construction, i.e., by main Dun Dun
The top beam body using the method section constructing structure section by section of balanced cantilever construction to both sides is pushed up, forms double cantilever knots of " T " font
Structure, then carry out the construction of bridge closure section.T structures bridge can also use the construction of construction bracket progress kingpost cantalever.
T structure bridge cantilever constructions or after removing main girder construction support, girder will produce excessive hogging moment at main pier, and main
Girder cantilever end can also produce excessive sagging deflections.If taking no action to, girder hogging moment crosses conference and causes to use at this at main pier
Steel amount and beam section are very big, more uneconomical, and excessive sagging deflections are unsatisfactory for the requirement of bridge linear, also have impact on driving and relax
Adaptive.In addition, it is too small to will also result in abutment pier support reaction, cause abutment pier seat empty, or even the disease to drop occurs.
The content of the invention
The present invention provides a kind of method of T structures bridge reduction hogging moment to solve technical problem present in known technology.
The present invention is adopted the technical scheme that to solve technical problem present in known technology：A kind of T structures bridge reduces
The method of hogging moment, in the design phase, reduced according to the setting of girder hogging moment at the counter-force design load of abutment pier bearing and main pier
Value pushes up design load on calculating, and up displacement design load s is calculated according to the upper top design loadDesign；In the construction stage,
According to the construction error of T structure bridge cantilever ends, the up displacement design load s is correctedDesign, obtain and actually push up shift value sIt is actual, root
Shift value s is actually pushed up according to describedIt is actualIt is determined that actually top loading carries F, then applied using jack in the T structures bridge cantilever end
The actually top loading carries F, and the T structures bridge is met the requirement of bridge linear.
When the T structures bridge is constructed using construction bracket, in the design phase, calculate construction bracket and withdraw the rear T
The sagging displacement y of structure bridge cantilever end2, calculate the upthrow displacement y of the T structures bridge cantilever end1=y2-sDesign, according to the T structures
The upthrow displacement y of bridge cantilever end1Determine the camber of the T structures bridge girder construction；In the construction stage, support to be onstructed is withdrawn
Afterwards, the elevation for measuring the T structures bridge cantilever end obtains hActual measurement, then calculate hActual measurement-hCalculate, obtain the construction of T structure bridge cantilever end height
Error y3, wherein hCalculateApply the grid DEM value before the upper top loading carries for T structure bridges cantilever end；Finally calculate and actually push up position
Shifting value sIt is actual=sDesign+y3。
When the T structures bridge is constructed using cantilever method, in the design phase, the sagging displacement of the T structures bridge cantilever end
Measure y2For the up displacement design load sDesign, according to the up displacement design load sDesignDetermine the T structures bridge girder construction
Camber；In the construction stage, the elevation for measuring the T structures bridge cantilever end obtains hActual measurement, then calculate hActual measurement-hCalculate, obtain the T
The construction error y of structure bridge cantilever end height3, wherein hCalculateApply the grid DEM before the upper top loading carries for T structure bridges cantilever end
Value；Finally calculate and actually push up shift value sIt is actual=sDesign+y3, obtain the up displacement.
The present invention has the advantages and positive effects of：The hogging moment of girder at bridge pier is reduced, reasonable stress, saves material
Material；The appropriate counter-force for adding abutment pier bearing, can effectively prevent abutment pier seat empty and drop；Efficiently solve construction middle girder
Sagging deflections, improve road-ability.
Brief description of the drawings
Fig. 1 is the application schematic diagram of the present invention；
Fig. 2 is using the analysis principle figure of the present invention when T structures bridge is constructed using construction bracket；
Fig. 3 is using analysis principle figure of the invention when T structures bridge uses cantilever construction.
Embodiment
In order to further understand the content, features and effects of the present invention, hereby enumerating following examples, and coordinate accompanying drawing
Describe in detail as follows：
Idea of the invention is that：After the construction of T structure bridge girders cantilever end terminates or rotator construction is in place, at kingpost cantalever end
It is applied with top loading and carries and reach predetermined design altitude, and comply with the requirement of bridge linear, main Dun Chu is eliminated with this
The counter-force of excessive hogging moment caused by girder and appropriate increase abutment pier bearing.
The concrete scheme of the present invention refers to Fig. 1~Fig. 3, a kind of method that T structures bridge reduces hogging moment, in the design phase,
Calculated according to the setting decreasing value of girder hogging moment at the counter-force design load of abutment pier bearing and main pier and push up design load, according to
The upper top design load calculates up displacement design load sDesign；In the construction stage, according to the construction error of T structure bridge cantilever ends,
Correct the up displacement design load sDesign, obtain and actually push up shift value sIt is actual, shift value s is actually pushed up according to describedIt is actualPass through
The conversion of girder rigidity determines that actually top loading carries F, is then actually pushed up described in T structures bridge cantilever end application using jack
Load F, and the T structures bridge is met the requirement of bridge linear.
The key of the present invention is that top loading carries F determination.
When the T structures bridge is constructed using construction bracket, in the design phase, it is also necessary to calculate after construction bracket withdraws
The sagging displacement y of the T structures bridge cantilever end2, calculate the upthrow displacement y of the T structures bridge cantilever end1=y2-sDesign, according to institute
State the upthrow displacement y of T structure bridge cantilever ends1Determine the camber of the T structures bridge girder construction；In the construction stage, because construction
The presence of error, up displacement design load s can be causedDesignIt is not inconsistent with actual up displacement, therefore, after support to be onstructed is withdrawn, surveys
The elevation for measuring the T structures bridge cantilever end obtains hActual measurement, then calculate hActual measurement-hCalculate, the construction error of acquisition T structure bridge cantilever end height
y3, wherein hCalculateApply the grid DEM value before the upper top loading carries for T structure bridges cantilever end；Finally calculate and actually push up shift value
sIt is actual=sDesign+y3。
When T structures bridge uses cantilever construction, the determination method that upper top loading carries F is similar with the above method, specifically, works as institute
When stating T structures bridge and being constructed using cantilever method, in the design phase, the sagging displacement y of the T structures bridge cantilever end2On described
Push up displacement design load sDesign, according to the up displacement design load sDesignDetermine the camber of the T structures bridge girder construction；Constructing
Stage, the elevation for measuring the T structures bridge cantilever end obtain hActual measurement, then calculate hActual measurement-hCalculate, obtain the T structures bridge cantilever end height
Construction error y3, wherein hCalculateApply the grid DEM value before the upper top loading carries for T structure bridges cantilever end；Finally calculate actual
Up displacement value sIt is actual=sDesign+y3, obtain the up displacement F.
Referring to Fig. 1, upper top loading carries before and after applying T structure bridge moments of flexure schematic diagram respectively as shown in curve 1 in Fig. 1 and curve 2.
It can be seen that upper top loading is carried after applying, girder hogging moment reduces at main pier, and stress is more reasonable；Meanwhile increase the branch of abutment pier bearing
Counter-force, it effectively prevent the generation of abutment pier seat empty and the phenomenon that drops.
Although the preferred embodiments of the present invention are described above in conjunction with accompanying drawing, the invention is not limited in upper
The embodiment stated, above-mentioned embodiment is only schematical, be not it is restricted, this area it is common
Technical staff is under the enlightenment of the present invention, in the case where not departing from present inventive concept and scope of the claimed protection, also
Many forms can be made, these are belonged within protection scope of the present invention.
Claims (1)
1. a kind of method that T structures bridge reduces hogging moment, it is characterised in that in the design phase, designed according to the counter-force of abutment pier bearing
The setting decreasing value of girder hogging moment calculates and pushes up design load at value and main pier, is calculated according to the upper top design load
Up displacement design load sDesign；In the construction stage, according to the construction error of T structure bridge cantilever ends, the up displacement design load is corrected
sDesign, obtain and actually push up shift value sIt is actual, shift value s is actually pushed up according to describedIt is actualIt is determined that actually top loading carries F, then use
Jack applies the actually top loading load F in the T structures bridge cantilever end, and the T structures bridge is met the requirement of bridge linear；
When the T structures bridge is constructed using construction bracket, in the design phase, calculate construction bracket and withdraw the rear T structures bridge
The sagging displacement y of cantilever end2, calculate the upthrow displacement y of the T structures bridge cantilever end1=y2-sDesign, hanged according to the T structures bridge
The upthrow displacement y at arm end1Determine the camber of the T structures bridge girder construction；In the construction stage, after support to be onstructed is withdrawn,
The elevation for measuring the T structures bridge cantilever end obtains hActual measurement, then calculate hActual measurement-hCalculate, the construction mistake of acquisition T structure bridge cantilever end height
Poor y3, wherein hCalculateApply the grid DEM value before the upper top loading carries for T structure bridges cantilever end；Finally calculate actual up displacement
Value sIt is actual=sDesign+y3。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610319495.3A CN105862601B (en) | 2016-05-13 | 2016-05-13 | A kind of method that T structures bridge reduces hogging moment |
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| CN201610319495.3A CN105862601B (en) | 2016-05-13 | 2016-05-13 | A kind of method that T structures bridge reduces hogging moment |
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| CN105862601B true CN105862601B (en) | 2017-12-12 |
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| CN110904812A (en) * | 2019-11-08 | 2020-03-24 | 中铁大桥科学研究院有限公司 | Method for reducing hogging moment of combined beam at auxiliary pier of cable-stayed bridge under live load effect |
| CN112482248A (en) * | 2020-12-04 | 2021-03-12 | 中铁北京工程局集团第二工程有限公司 | Construction method of large-span arch stiffened asymmetric-section continuous beam |
| CN114622497B (en) * | 2022-04-08 | 2023-04-25 | 西安公路研究院有限公司 | Bridge rapid rush-repair method without increasing dead weight of main beam |
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| EP1378608A1 (en) * | 2002-07-05 | 2004-01-07 | VSL International AG | Method for preparation of reciprocal pressing surfaces of segments of a construction |
| CN100465377C (en) * | 2006-12-27 | 2009-03-04 | 重庆交通大学 | Baseboard cable horizontal arrangement prestress concrete variable cross-section box girder bridge and construction method thereof |
| CN105525572A (en) * | 2014-10-24 | 2016-04-27 | 中铁十四局集团有限公司 | Method for replacing hogging moment prestressed tendons of T-shaped beams by artfully using jack |
| CN104389273B (en) * | 2014-12-04 | 2016-03-02 | 中铁二十三局集团有限公司 | Cantilever pouring continuous beam linear control method |
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