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病害的连续刚构桥,其主梁存在裂缝,从而削弱结构的承载能力,影响桥梁的正常使用,危及桥跨结构的安全与耐久性。桥梁加固就是要增强结构承载能力、消除构件裂缝、恢复桥梁设计高程。基于连续刚构桥高程与结构内力的耦合关系,首次提出了先恢复桥梁设计高程,然后再增强主梁承载能力的加固方案,并在此基础上创建了病害连续刚构桥高程恢复技术;针对连续刚构桥加固施工的特殊性所开发的顶推变高度钢桁架转向梁横张体外预应力索增强技术,较好地解决了体外索的实际受力与理论计算不一致的问题,简化了体外索张拉施工,实现了加固预应力索一次张拉到位的施工方法。本文构建的病害桥梁加固技术也适用于各种梁式桥的加固治理。
Continuous rigid frame bridge disease, the main beam cracks, thus weakening the carrying capacity of the structure, affecting the normal use of the bridge, endangering the safety and durability of the bridge structure. Bridge reinforcement is to enhance the carrying capacity of the structure, eliminating cracks in components, restoration of bridge design elevation. Based on the coupling between the elevation of rigid frame bridge and the internal force of the structure, this paper proposes the first reinforcement scheme that firstly restores the design elevation of the bridge and then strengthens the bearing capacity of the main beam, and on the basis of which, establishes the elevation restoration technology of the continuous rigid frame bridge. Continuous Rigid Frame Bridge Reinforced by the special nature of the development of the top of the pusher deformation height steel truss steering beam transverse external prestressed cable reinforcement technology to better solve the actual stress of the extra-corporeal cable and the theoretical calculation of inconsistent problems, simplifying the in vitro Cable tension construction, reinforced prestressed cable to achieve a construction method in place. This article builds the disease bridge reinforcement technology also applies to various beam bridge reinforcement management.