Study Of Closure Technic For Long Span Rigid Frame Bridges With Tall And Low Pier

The technique of bridge closure stage is one of the most critical construction processes in large-span rigid frame bridge construction. Because large-span rigid frame bridge is hard to repair after the completion, closure construction is the last chance to pre-construct the linear error and reduce internal force, so long good or bad of the closure construction relate to the quality of the entire bridge. Long span rigid frame bridge with tall and low Piers is a very special one of this kind of bridge .It's structure is serious asymmetry, compared to the general structure of symmetric or asymmetric structure which can be simplified as symmetric structure for the calculation , the process of its force and coordinates is even more complex and changeable.In this paper, a long-span rigid frame bridge with tall and low piers as the construction background, including the date and information of design, construction monitoring, and other aspects of the construction of large-span rigid frame bridge with tall and low piers, the sensitivity of internal force, stress and displacement of load and non-load factors is analyzed. The main research work of this article is followed:1) Non-load factors, the method of calculation the internal force, displacement of box beam and thin-wall pier are studied. The significant impaction of the non-load is discussed.2) According to the technique of the bridge closure stage, the affection of load factors for construction of the closure stage is in discussion. Major closure working operations with its advantages and disadvantages of long-span rigid frame bridge are list. Some advice of the applicability of the various closure construction methods, key construction technology is proposed.3) According to the example bridge, closure monitoring of the whole closure stage of long-span rigid frame bridge is introduced. Base on the construction, construction monitoring and simulation results, the construction of fold-active control of internal forces and the structure liner of the construction technology and its feasibility are proposed.