Jacking municipal frame bridge structure and construction method

Abstract

The invention relates to the technical field of municipal frame bridge construction, in particular to a jacking municipal frame bridge structure and a construction method. The jacking municipal framebridge structure comprises a foundation pit, the two sides of the foundation pit are each provided with a first fender post crown beam and a plurality of first fender posts, a back post is arranged atthe tail of the foundation pit, and a back post crown beam is arranged at the top of the back post; a cast-in-place frame structure bridge is arranged in the foundation pit, and a sliding piece is arranged at the bottom of the frame structure bridge. Second fender post top beams and a plurality of second fender posts are arranged on the two sides, in place, of the frame structure bridge. According to the invention, the pushing construction method is applied to the design and construction of the municipal frame-structure bridge close to the high-speed rail bridge; the problem of high-speed rail bridge pile upheaval caused by soil body unloading in construction is solved through structural balance weight, the influence of long soil body exposure time on high-speed rail bridge pile deformation is reduced through time and space timeliness, and the influence of municipal road high-speed rail bridge pile construction close to high-speed rail bridge piles on existing railway operation is effectively reduced.

Description

Technical field [0001] The invention relates to the technical field of construction of municipal frame bridges, in particular to a jacking municipal frame bridge structure and a construction method. Background technique [0002] Municipal road engineering is an important part of urban construction. The municipal frame bridge is a highway-rail overpass that passes under the highway and is close to the railway. Its main structure is a box-shaped frame. The framed bridge does not affect the normal operation of the railway during its implementation. At present, due to the rapid development of high-speed railway construction, there are more and more municipal roads underpassing high-speed railway bridge projects. During the underpassing process, there will be problems with adjacent high-speed railway bridge piles. In recent years, high-speed rail bridge deformation control requirements have become increasingly strict, and railway safety during operation must be ensured. At present, th...

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Problems solved by technology

In recent years, the requirements for the deformation control of high-speed rail bridges have become increasingly strict, and railway safety must be ensured during the operation period. At present, the existing technologies for municipal engineering adjacent to high-speed rail bridge piles are mainly open excavation, concealed excavation, and shield construction. The cost of underground excavation and shield construction It is generally high and has strict requirements on the alignment of municipal roads. The open-cut construction method can easily cause high-speed rail bridge piles to bulge when unloading soil during foundation pit excavation. Improper construction control can easily cause the amount of uplift to exceed the limit and the smoothness of the high-speed rail track to exceed the limit , affecting driving safety

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