Maintenance Consolidation Research Of Rigid-framed Arch Bridge

Along with our country economic fast development, the road volume of traffic unceasingly increases, the load of highway bridge aggravates day by day. contradictory is prominent. Because carring out the tow-hang transportation and the containerized traffic, the situation is general that the bridge's supporting capacity is insufficient, and the bridge is unceasing aging and damaged. The disease comes forth in kinds of constructed bridge, especially in some bridges which had the problem in their structure, the design theory of which is not mature, constructing experience of which is insufficient.Rigid-framed arch bridge is the scientific research achievement of the Ministry of Communications Road Research Institute, which was firstly completed from 1977 to 1978 in the Wuxi County of JiangSu Province. It was the reinforced concrete arch structure,which was one kind of new bridge developed according to truss arch bridge, rib arch and the slanting leg Just construction, belonging to the structure of ultra calm thrust force of higher mode. It has the merit of few component, lightly self-weight, simple construction, more advanced economic indicator, the artistic modeling. And it is widespreadly applied in our country, according to incomplete statistics, there have 30,000 meters' rigid-framed arch bridges. Rigid-framed arch bridge has so many merits but has many problems, its characteristic brings a fatal question, that is : it's integrity is worse, causing the insufficient transverse stability, causing the disease of the bridge structure, for example: dehiscence in the micro angle iron, the board breaking and even the perforation, caves in, cracking of the bridge floor continuing neighbor, dehiscence in the arch foot, massive dehiscences of the bridge floor, dehiscence in the host rib pitch point and the solid abdomen section, dehiscence in the area of host rib negative curved strength. Many rigid-framed arch bridges have become the danger bridges, which seriously affect the normal operation of vehicles. Therefore, the service reinforcement research of the rigid-framed arch bridge has the extremely important practical significance.This article takes LongChuang Bridge as an object in the federal highway 324 of Guangxi, main resreach about rigid-framed arch bridge is the plant disease's origining analysis, the reinforcement designs and constructing technology. And obtaining the main conclusion includes: If we inspect the plant disease situation and analysis reasonand the latent development tendency, acting the reasonable service reinforcement technology plan, simultaneously controling the construction quality, old bridges can be completely restored and enhanced their useful function after the reinforcement, meeting great volume of traffic needs which increases day by day. Comparing Reinforceing the old bridge and the newly building bridge, former both saves the investment and the time limit of a project, and can avoid the long time traffic interruption and the bad society effect, has the very big economic and social efficiency.