Construction method of continuous rigid frame bridge pushing closure
A construction method and technology of jacking construction, applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve problems such as failure to achieve prestressed construction effects, great adverse effects, limiting the span of continuous rigid-frame bridges, etc. Unfavorable secondary internal force, improved span, simple bridge construction effect
Active Publication Date: 2013-01-23
SHANGHAI URBAN CONSTRUCTION MUNICIPAL ENGINEERING (GROUP) CO LTD
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Problems solved by technology
In this way, during the construction of the mid-span section of the bridge, the construction effect of the tensioned mid-span prestressed steel beam is greatly affected by the unfavorable impact of the fixed support end of the pier bottom, and the ideal prestressed construction effect is often not achieved, which greatly limits The span of a continuous rigid frame bridge
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Embodiment
[0021] Embodiment: This embodiment will take the V-shaped pier rigid frame bridge as an example for specific description. Through the push-up construction of the V-shaped pier, the theoretical value of the upper arch of the mid-span beam body 2 is 27.7cm, and the side-span beam body 1 at both ends The theoretical value of the downward deflection is -32.7cm, and the longitudinal displacement from the bottom of the V-shaped pier to the middle span can reach a maximum of 10cm. In order to ensure sufficient rigidity of the side-span side soil of the cap, the soil on the side of the cap 6 and the pile foundation close to the side-span beam body 1 is firstly reinforced. The special feature of this construction method is that a movable hinge support 5 is set in the cap platform top groove 4, the lower part of the movable hinge support 5 is fixed with the cap platform top groove 4, and its upper part is connected with the pier bottom 13 fixed. After the pier 8 is pushed and moved to ...
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The invention belongs to the field of bridge engineering construction, in particular relating to a construction method of a continuous rigid frame bridge pushing closure. The detailed technical scheme is as follows: pouring a groove on the top of a bearing platform, setting up a movable hinged support to hinge the top of the bearing platform with the bottom part of a pier; closing the mid-span bridge body of the rigid frame bridge; taking the bearing platform as a backup and enabling the mid-span bridge to produce an upwarp through pushing; then downwarping the side-span bridge, and simultaneously stretching prestress steel cables of the mid-span bridge; after the deformation of the mid-span bridge body reaches the designed elevation of the mid-span bridge, locking the hinged support, and pouring concrete in the groove to solidify the pier and the bearing platform; and closing the side-span bridge. The construction method in the invention has the advantages of clear operating procedures and simple bridge structures; through the techniques of firstly closing the mid span then the side span, firstly hinging the bottom of the pier then solidifying the same, and pushing the prestressed steel cables while stretching the same, the adverse secondary internal force generated in the closure stage of the continuous rigid frame bridge is effectively eliminated, and the span of the continuous rigid frame bridge can be improved, therefore, the invention is applicable to V-shaped piers or T-shaped continuous rigid frame bridge.
Description
technical field [0001] The invention belongs to the field of bridge engineering construction, and in particular relates to a construction method for pushing and closing the top of a continuous rigid frame bridge. Background technique [0002] The conventional construction technology of rigid frame bridge is: the bottom of T-shaped pier or V-shaped pier is firmly supported on the cap. In this way, during the construction of the mid-span section of the bridge, the construction effect of the tensioned mid-span prestressed steel beam is greatly affected by the unfavorable impact of the fixed support end of the pier bottom, and the ideal prestressed construction effect is often not achieved, which greatly limits The span of a continuous rigid frame bridge. [0003] Therefore, those skilled in the art urgently need a construction method that can effectively eliminate the unfavorable secondary internal force produced in the closing process and increase the span of the continuous r...
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Inventor 周松王洪新陈立生姚青陈军炜陈斌
Owner SHANGHAI URBAN CONSTRUCTION MUNICIPAL ENGINEERING (GROUP) CO LTD