Research On The Problems Of The Temporary Structures During Bridge Construction

It requires a lot of temporary structures in the bridge construction process .About these large-scale temporary structures, investing too much leads too more wasting., but these temporary structures are likely to result in the engineering accident if they design unsafely . Although the temporary structure of the bridge construction are the subsidiary structure of the bridge construction , the quality of the temporary structure affects the construction safety,the construction economy and the quality of the permanent structures. Every security the temporary structure will impact on the safety of the bridge construction . The primary content is as follows for the design of temporary structures:①At present the main method used in the temporary structure design is the allowable stress method.There is no bridge criterion for the temporary structure or these provisions is scattered in the relevant regulations ,which is lack of systematic.This thesis gives a summary and conclusion for this .②Based on the reliability theory, this thesis introduces the design reference period and discusses the limit state method used in the temporary structures.③Analysis the working conditions of the steel cofferdam and the hanging basket currently used in the temporary structure design.Point out the construction load of each woking condition and the problems we should pay attention to particularly during the construction process,introduce the allowable stress method used in a hanging basket briefly.④Point out the conservation ,the maintenance of the specific measures to be taken ,the measures to prevent the construction accident again in the reuse temporary structures such as the cable erection and the hanging basket.