Study On Optimization Of Highway Bridges Broaden Splicing Technology

Along with our country transportation enterprise's development, the road volume of traffic grows unceasingly, some road original rank cannot satisfy for the using request, therefore must make the broaden transformation. At the same time, it is need for re-design the bridges on the highways and other structures, and take full advantage of widening the existing bridge. The old bridge that can not meet new standards requirement need to evaluate the identification, maintenance, strengthening and reform, go through the technical, economic comparison, and the new standards.This article reviews successful extension experiences of Shanghai and Nanjing, Shenyang-Dalian, Guangzhou-Foshan expressway, and collected the existing bridge and widening of the evaluation of information technology in the extension works, summed up the main bridge between the current broad concepts, methods, classification and characteristics, and carries on the corresponding analysis with the project example to each kind of broaden pattern, discussed the suitable condition, and also make the goal and significance of the bridge broaden research from the engineering economy, the construction technique, social impact and other aspects. And make deep research for each kind of bridge broaden design proposal and job practice, to analyzed refabricated box Liang, the prefabricated hollow plank bridge, cast-in-place reinforced concrete continual box Liang, the cast-in-place reinforced concrete rigid-frame bridge, prefabrication prestressed concrete one built-up beam several kind of bridges to conduct the analytical study separately, and also analyzed the differential settlement the influence which widens to the bridge, simultaneously to descript the concrete shrinkage which, the continuous variation the old bridge whole widened the influence which widened to the bridge .Moreover, it is established the broaden prefabrication hollow board and the prefabricated box Liang's computation model, and according to routine calculation's result, carries on mechanics examination to the broaden technical achievement in order to the numerical model and the actual situation tally. Finally, according to the bridge technical position, and to inducte proposed that reasonable widens the measure target-oriented.