（1 河南城建学院土木工程学院, 平顶山 467036； 2 郑州长建工程技术开发有限公司， 郑州 450000；3 平顶山天安煤业股份有限公司一矿， 平顶山 467000）

［摘要］平顶山天安煤业有限公司一矿选煤厂901输煤皮带走廊建于20世纪80年代，经过30多年的使用，钢桁架结构下弦及下弦节点出现严重锈蚀，杆件及节点板承载力已不满足设计要求，给生产带来严重安全隐患。经论证分析，在不影响正常生产的情况下，采用预应力钢绞线加固方法，对钢桁架进行了整体加固，以转移承载力不足的下弦杆件受力。通过理论及有限元计算分析，并经现场预应力张拉试验，预应力加固钢桁架皮带走廊方法具有高效、经济及施工方便等优点，该方法可广泛推广应用到该类型的皮带走廊加固中。

［关键词］预应力； 钢桁架； 检测； 加固

中图分类号：TU391文献标识码：A文章编号：1002-848X(2018)09-0088-04

Application research on prestressed reinforcement and testing of steel truss coal belt corridor

Zhang Fengjian1, Sang Dayong2, Zhang Jinhong3, Wei Kelun1 , Ma Zhengwei1, Liu Zhiqin1

(1 School of Civil Engineering, Henan University of Urban Construction, Pingdingshan 467036, China; 2 Zhengzhou Changjian Engineering Technology Co.,  Ltd.,  Zhengzhou 450000, China; 3 No.1 Mine Coal, Pingdingshan Tianan Coal Co.,  Ltd.,  Pingdingshan 467000, China)

Abstract:The 901 belt corridor of No.1 Mine Coal, Pingdingshan Tianan Coal Co.,  Ltd. was built in the 80′s of 20th century， after more than 30 years of use， the bottom chord and the  bottom chord  joints of the steel truss have appeared serious corrosion， the bearing capacity of the main bar and the joint plate can not meet the design requirements, which brings serious security risk to production. Without affecting the normal production, the stell truss was reinforced by the  prestressing  steel strand, and the stress of the bottom chord was greatly reduced. Through theoretical and finite element analysis, and through the field prestressed tensile test, prestressed reinforcement method of stell struss belt corridor has been proved to be very effective and has the advantages of economy and construction convenience, the method can be widely applied to the reinforcement of this type of belt corridor.

Keywords:prestress; steel truss; testing; reinforcement

*河南省科技攻关项目(142102310470)。

作者简介：张锋剑，博士，副教授，Email：zfj9608@163.com。