Long-united bridge widening splicing structure and construction method thereof

Abstract

The invention relates to a long-united bridge widening splicing structure which comprises an old bridge, a new bridge and a splicing seam. The long-united bridge widening splicing structure is characterized in that transverse splicing between the old bridge and the new bridge is realized through the splicing seam, the splicing seam is formed by a continuous splicing section and a discrete splicing section, a new bridge main beam and an old bridge main beam of the continuous splicing section are connected by adopting a cast-in-situ wet joint and a horizontal partition, and a new bridge main beam and an old bridge main beam of the discrete splicing section are connected by arranging a connecting component at an interval, so that the new bridge and the old bridge which are widened form a firm integral structure. The long-united bridge widening splicing structure has the advantages of simple construction method, short construction period, avoidance of shear failure of a widened old bridge support and the like, is suitable for long-united bridge widening construction of highways of various levels, fully utilizes resources of the old bridge, meets requirements of sustainable development and building of resource-saving and environment-friendly society, and is worthy of popularization.

Description

technical field [0001] The invention relates to the technical field of construction, in particular to a widening and splicing structure of a long-connected bridge and a construction method thereof. Background technique [0002] In recent years, with the rapid development of my country's economy, my country's transportation industry has made great progress. However, due to the increasingly frequent movement of people and goods, the demand for transportation has surged. The existing scale and level of highways, especially expressways, as passageways for the flow of people and materials are becoming more and more difficult to meet the requirements of economic development. According to the "2012 Statistical Bulletin on the Development of Highway and Waterway Transportation Industry" compiled by the Planning Department of the Ministry of Communications in 2013, the average daily traffic volume of national expressways in 2012 was 21,305 vehicles, and the average daily driving vol...

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Problems solved by technology

For ordinary simply supported beam bridges, due to their small spans, the plane bending deformation of the spliced ​​overall structure caused by the difference in shrinkage and creep of old and new concrete is not obvious, and has little impact on the normal use of such bridges. However, for long-connected bridges, due to the large span and long single-connected length, under the effect of shrinkage and creep differences between old and new concrete, the plane bending deformation of the widened overall structure will be very significant, and due to The bearings used in the bridges built in the early stage are usually ordinary plate rubber bearings, which have small deformation capacity, which will lead to excessive lateral displacement of the old bridge bearings after the long-connected bridges are widened, and shear failure will occur, affecting such The normal use of the bridge, this phenomenon was also found in the survey of the Jiangsu section of the Shanghai-Nanjing Expressway after many years of splicing

[0004] At present, it is mainly to prolong the static time after the new bridge is built to solve the problem of plane bending deformation of the overall structure after the widening of the long-connected bridge, which leads to excessive lateral displacement of the old bridge support and shear failure.

However, after the new bridge is completed, it takes a long time to stand still (generally 2 to 3 years, and some even exceed 3 years). On the one hand, it will seriously prolong the construction period; There are many adverse effects on maintenance and maintenance work

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