Prestressed composite girder continuous bridge constructed by introducing prestressed concrete steel prestressed by a construction stage and compression stress to the upper structure through a partial down process

摘要

The subject innovation is to construction stages to tensile force is introduced by the tension device it serves to apply to the multi-span bridge of two or more bridges, one connecting to each other and subsequently the beam is installed at a predetermined height inside the fulcrum portion, and then installed in the branch portion and the center portion of the girder relates to a continuous bridge, and methods for their installation with a prestressed composite girder to the prestress is introduced to the compression stress on the top structure according to the strain effect and a partial fall of the prestressed composite beam including the introduction of the PS's beams and steel composite girder installation, It utilizes the testing devices by attaching the displacement gauge to the relative displacement measuring time of the fall of the prestressed composite girder to prevent deformation.; The span if an even number of spans in the first inner point portions or more than 6 span bridge of the bridge with a span of from bridge to 5 span or 5-span yisangjung odd has the higher salaries of constant height in part the first inner point portion and the center point by sequencing the prestressed composite girder adjacent to the installed and in a next adjacent compressive force introduced by means of the prestress which the anchorage is installed to the sub-side end portions in the point of the composite girders interconnected by strand fulcrum portion tension device installed by placing the slab prestressing the upper structure introduced and; Unlike conventional technology, and to promote the conventional up-down and down three bridges over the span of a high quality durable improvement in the continuous education did not apply in the process and the seamless construction, rather than performing the up-down and down process at all piers, up to five spans or 5-span conducted down only in the first inner points of the bridge portion having a span of yisangjung odd number or, in the case of an even number of from more than 6 span bridge span has a down step of carrying the descent in the first inner point portion and a middle fulcrum portion a prestress required by rough part down step of introducing the upper structure, and then as to the introduction of tensile force on the strand provided by the anchorage is installed at the center lower portion of the prestressed composite beam introducing a prestress to the upper structure by tension of said PSI steel material, the synthetic the prestressed girders Introduced by the PS in said steel material with a partial step-down as to the main feature that causes the step-by-step installation and compression force.; Further, the prestressed composite that is characterized in attaching a displacement gauge to measure displacement of the girders when lowering the prestressed composite girder by installing a quality control device to prevent the harmful stresses on the composite girder action during descent displacement meter girder continuous bridge relates to a construction method.