.Method for connecting continuously slab concretes of multi-span preflex composite bridge and represtressed preflex composite bridge.

摘要

Steel I-girder with reinforced concrete or the same time blood seed strand or blood. Mr. Beam simple combination of steel rods joined Preflex beam or leaf Wrist rests free of two or more span a flex-beam is a hypothesis independently on each of the span bridge alternately in as after, placing an upper slab of concrete so that each span is continuous, in the prior art, each successive coupling points according to the change of successive beam structural system such that each span a continuous during construction a simple beam structural system after the switching to the continuous beam structural system with respect to the negative moment load acts because the upper concrete slab, the tensile stress is generated. In general, the upper concrete slab of continuous binding points this case is a crack in the concrete severely generated as a structure can not sufficiently resist the tensile stress is gradually weakened structural damage.; In the present invention, as shown in Figures 3 to 6 illustrate the drawing, a top slab concrete 3 before (continuous beam switching to the structural system old) steel I-beam in each pair simply bobim adjacent the continuous attachment point for placing the depending on the support fixing section P, Mr. strand or blood. the seed bar (9) after a pre-disposed to control the initial stress, the top slab of concrete (3) each span in the upper flange 8 of the girder (1) all the tensile stress caused by the negative moment of hameuroseo casting to continuous, continuous connection point P, Mr. strand or blood seed bar (9) Accordingly, the excessive tensile stress and the upper slab of concrete (3) of continuous connection point to be a burden and so as not at all due to cracks or to provide an acceptable range of the crack-free flax span composite girder bridges and leaf Wrist rests Preflex composite slab concrete girder bridge a series of coupling can be suppressed within the method.