体外预应力加固混凝土桥的钢结构锚固转向体系研究

Research of Steel Structure Anchoring and Deviating System for Strengthening of Concrete Bridges by External Prestressing

体外预应力技术是一项加固既有梁桥的有效措施,而锚固转向体系是体外预应力加固技术中的重要组成部分。针对目前常用的钢筋混凝土锚固转向块的不足,提出一种新型的钢结构锚固转向体系,该体系具有对原桥跨结构的恒载影响小、联接方式可靠、后期影响小、施工快捷、体外预应力设计灵活等特点。工程实践证明,该新型钢结构锚固转向体系安全可靠,也使得体外预应力技术加固混凝土旧桥的设计更加方便、施工更加快捷,效应也非常明显。

The external prestressing technique is an effective measure for strengthening of existing concrete girder bridges whilst the anchoring and deviating system serves as an important component for the strengthening by external prestressing technique.In the light of the deficiency of the commonly-used reinforced concrete anchoring and deviating blocks,a type of new steel structure anchoring and deviating system is developed.The new system is characterized by little influence on the dead load of the original bridge span structure,reliable connection,little late period influence,quick construction and flexible design of external prestressing.Practice proves that the new system is safe and reliable and can make the design of the strengthening of old concrete bridges by the external prestressing technique more convenient and the construction quicker and the effect of strengthening by the system is also sound.