Method for incremental launching construction of bridge

Abstract

The invention discloses a method for incremental launching construction of a bridge. The method includes the following steps: (1), setting up an incremental launching construction platform; (2), assembling multiple prefabricated bridge sections on the incremental launching construction platform to form a current bridge section; (3), utilizing the incremental launching construction platform to push the current bridge section to the tail end of a bridge section which is pushed already for assembling; (4), utilizing the incremental launching construction platform to continue to push a current bridge section which is already assembled with the bridge section which is already pushed out until a current bridge section of a portion used for maintaining bridge assembling line shape is reserved above the incremental launching construction platform, wherein minimum length of the incremental launching construction platform is equal to a sum of length of a current bridge section to be assembled and length of the bridge section, which is already pushed out, of the portion used for maintaining the bridge assembling line shape. The method guarantees bridge assembling accuracy and construction quality and has wide application range.

Description

technical field [0001] The invention relates to a road and bridge construction technology, in particular to a bridge pushing construction method. Background technique [0002] The jacking construction method is mostly used in the construction of prestressed reinforced concrete equal-section continuous girder bridges and cable-stayed bridges. Specifically, the beam body is poured or assembled section by section at the bridge head, and the jack is pushed longitudinally to make the beam body pass through the temporary sliding bearing surface on the top of each pier. The jacking construction is to set up the construction site behind the abutment, pour the beam body in sections, and use longitudinal prestressed tendons to connect the pouring segments with the completed beam body as a whole, and install steel with a length equal to the specified ratio of the jacking span in front of the beam body. Guide the beam, and then apply force through the horizontal jack to push the beam b...

AI Technical Summary

Problems solved by technology

[0003] refer to figure 1 , the length of the existing assembly platform usually only meets the assembly length requirement of one round of the main beam. After one round of ejection, there is no beam section reserved on the platform to maintain the line shape, so that the subsequent beam section cannot achieve a stress-free assembly line type; another aspect, refer to image 3 and Figure 4 , the existing force calculation method of the platform considers the force of all the fulcrums of the lower part of the beam section on the platform, but ignores the situation that some fulcrums are empty and redistributes the force of adjacent fulcrums. In this case, the The force on the adjacent local fulcrum increases, resulting in an increase in the maximum reaction force of the shifter and the platform

[0004] The reason for the above shortcomings is that the front end of the part of the main beam that has been ejected from the platform is deflected under the action of its own weight, which causes the influence of the change of the bottom line of the overall beam on the subsequent assembly of the upper beam section on the platform.

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