体外预应力加固混凝土桥的钢结构锚固转向体系研究

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发布时间：2021-10-22

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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。
关键词：桥梁工程；体外预应力；加固；钢结构；锚固转向体系
中图分类号：U445．72 文献标志码：A
Research of Steel Structure Anchoring and Deviating System for
Strengthening of Concrete Bridges by External Prestressing
LIUHua ，ZHULi—ming ，ZHANGJun-lei ，WANG Zhi-jUn。
(1．China Railway Major Bridge Reconnaissance& Design Institute Co．，Ltd．，W uhan 430050，China；2．China
Railway Major Bridge(Nanjing)Bridge and Tunnel Diagnosis and Remedy Co．，Ltd．，Nanjing 210061，China)
Abstract：The external prestressing technique is an effective measure for strengthening of ex—
isting concrete girder bridges whilst the anchoring and deviating system serves as an im portant
com ponent 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 pe—
riod 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 con—
crete bridges by the external prestressing technique more convenient and the construction quicker
and the effect of strengthening by the system is also sound．
Key words：bridge engineering；external prestressing；strengthening；steel structure；ancho—
ring and deviating system
1 引言
近 10年来，体外预应力技术被广泛应用于既有
旧桥的维修加固中。吴力宇Ⅲ对体外预应力技术的
优缺点、设计和防腐等方面进行了探讨；项贻强等嘲
从静、动力性能的角度研究了体外索在 T形刚构桥
加固中的应用，提出存在体外索与桥跨振动频率接
近的现象；艾军等嘲结合静载试验，对体外预应力加
固体系的理论与构造作了阐述；张嘉恒等 ‘ 详细研