钢筋混凝土过渡墩盖梁开裂成因分析及加固处治  

Analysis of the causes of cracking of reinforced concrete transition pier cover beams and reinforcement treatment

作　　者：高志朋 张晋平 Gao Zhipeng;Zhang Jinping(Hubei Transportation Planning and Design Institute Co.,Ltd.,Wuhan Hubei 430051,China;Taiyuan Architectural Design and Research Institute,Taiyuan Shanxi 030002,China)

机构地区：[1]湖北省交通规划设计院股份有限公司,湖北武汉430051 [2]太原市建筑设计研究院,山西太原030002

出　　处：《山西建筑》2024年第18期144-147,152,共5页Shanxi Architecture

摘　　要：G42沪蓉高速公路湖北省境内某大桥全长668.04 m,全宽24.5 m。上构预应力混凝土T梁采用先简支后结构连续,下构桥墩盖梁横桥向长10.90 m,顺桥向宽2.20 m,悬臂长度1.75 m。19号桥墩盖梁由于混凝土保护层厚度偏厚,混凝土浇筑养生质量不佳,导致盖梁的两侧立面、底面均出现了网状裂缝,裂缝宽度超限且数量多,同时盖梁顶面出现了一条贯通的横向裂缝。结合工程实例,介绍了该桥墩盖梁加固采用的张拉预应力碳纤维板法、张拉预应力钢筋法、粘贴钢板法等加固方法。A bridge in Hubei Province of the G42 Shanghai-Chengdu Expressway is 668.04 m long and 24.5 m wide.The upper prestressed concrete T-beam adopts a simple support and then continuous structure.The horizontal bridge length of the lower bridge pier cover beam is 10.90 m,the width along the bridge is 2.20 m,and the cantilever length is 1.75 m.Due to the thick thickness of the concrete protective layer and the poor quality of concrete pouring,the mesh cracks appear on both sides of the facade and bottom surface of the cover beam.The width of the cracks exceeds the limit and the number of cracks is large.At the same time,a transverse crack appears on the top surface of the cover beam.Combined with engineering examples,this paper introduces the tensile prestressed carbon fibre plate method,tensile prestressed steel bar method,pasted steel plate method and other reinforcement methods used to strengthen the bridge pier cover beam.

关 键 词：桥墩盖梁 成因分析 张拉预应力碳纤维板 张拉应力钢筋 加固 

分 类 号：TU997[建筑科学—市政工程] U445.72[建筑科学—桥梁与隧道工程]