A construction method for a high-speed oblique-leg rigid-frame bridge

Abstract

The patent of the present invention discloses a construction method for a high-speed slanted-leg rigid-frame bridge, which includes the steps of: leveling the foundation according to the design plan of the stent, erecting the full slant leg support and the steel pipe column-less support for the beam body; installing the slant leg part The bottom formwork and part of the steel formwork of the beam body; simulate the construction load to preload the support, monitor and record according to the specifications, and measure the elastic deformation and inelastic deformation of the support; accurately adjust the elevation of the bottom form according to the preloading data; bind the oblique leg steel bars, install Slant leg side formwork and cover formwork; binding beam body web reinforcement, installing web inner formwork; erecting inner roof support, installing roof formwork; binding roof and wing plate reinforcement; pouring slant leg concrete, after the slant leg concrete initially set Pouring beam concrete; the present invention solves the problem that the full hall support in high-speed construction cannot guarantee road traffic, and the single steel pipe column with few supports cannot meet the problem of oblique leg construction through the combination of the full hall support of the inclined legs and the few supports of steel pipe columns.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a construction method for a high-speed oblique-leg rigid-frame bridge. Background technique [0002] When the expressway intersects with the local road, and the surface of the expressway is far lower than the surface of the local road, the design generally adopts a newly built overpass of the expressway to connect with the original local road, and most of them are rigid frame bridges with oblique legs. At present, the construction method basically adopts the method of full hall support and the method of steel pipe column with less support. [0003] Full hall support: First set up the support and pour the oblique legs; after the oblique legs are completed, continue to erect the supports on the oblique legs to pour the beam body. When pouring the beam body, the slanted leg support not only bears all the loads of the slanted leg, but also bears all the ...

AI Technical Summary

Problems solved by technology

When pouring the beam body, the slanted leg support not only bears all the loads of the slanted leg, but also bears all the loads of the upper beam structure of the slanted leg and the support formwork. deformation, resulting in construction cracks at the rigid connection between the oblique legs and the beam body; since the construction cannot be broken, it is necessary to build a doorway in the middle of the bracket, which further reduces the integrity of the bracket, and the thrust towards the middle of the oblique legs on both sides cannot be effectively reacted. force support

[0004] Steel pipe column less support method: it can solve the problem of road traffic protection and upper beam load problem well, but it will cause a lot of cutting waste of profiles in the erection of inclined leg supports, and it is difficult to apply to general construction with different inclined leg heights

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