Construction Technology Of Concrete Arch Bridge By Long Span Adjustable Steel Arch Frame Without Rest Pier

The no-supporting pier steel arch frame is seldom used in arch bridges construction, moreover, their spans were less than 100 m, and their highway classification and technical requirement were not strict. It was seldom reported that curvatures of arch centering before and after assembly were controlled by L-shaped machining part. Integrated construction technology of concrete arch bridge with long span steel arch frame was introduced systematically in this thesis.According to parameters of arch axis of this bridge, the arch axis of steel arch frame were set up to catenaries, 64-style military beam, L-shaped control-bar and the port triangle were used to form 139.5 meter truss arch frame with double hinges. Based on finite element theory, with computer's simulation, the elements of arch frame were verified by SAP90 program and PCSAP program, as well as were calculated by handwork.The thesis specified the cast-in-site technique in sections and loops of concrete arch bridge, the technology of connecting and the technology of linearity control during construction of main arch.Cable crane with 240m span was designed and assembled to transport material.After construction of the main arch, and reaching the designed strength, sandbags made of canvas were used to unload.Only one arch centering of arch bridge was assembled, through pre-buried slide arch centering was whole sliped to the other position after construction of one arch centering, so as to reuse arch centering.When the construction of a half arch was finished, the steel arch frame was move to another half arch position, so this steel arch frame was second used.During cast-in-site and support unloading of concrete arch bridge, it should inspect the deflection and stress of representative section of arch frame and the stress of representative section of concrete arch, thus digital-monitor went along construction, the safety of construction was ensured.By construction of the bridge, validity and feasibility of the long span steel archframe were verified, and experience and data could be supplied for the subsequent construction of homogeneous bridges.