浅谈贝雷桁架式挂篮施工安全质量事故防治对策
2015-10-21曹鹏
曹鹏
【摘要】贝雷桁架式掛篮施工是混凝土连续梁施工中的常用工艺,由于其受施工条件限制小,工程造价相对较低等特点,被广泛使用,但是预应力混凝土连续箱梁施工过程复杂,安全质量事故仍时有发生。笔者结合亲身经历的合福铁路铜陵长江大桥项目施工经验,通过对挂篮结构组成及常见安全质量事故分析,提出相应的防治对策,以便为同类工程提供借鉴。
【关键词】贝雷桁架式挂篮;安全质量;防治对策
Abstract:Is commonly used in concrete continuous beam construction bailey truss type hanging basket construction process, due to its construction conditions, construction cost is relatively low, is widely used, but the prestressed concrete continuous box girder construction process is complex, safety and quality accidents still happen. The author combined with personal experience in the tongling Yangtze river railway bridge project construction experience, through the hanging basket structure composition and the common safety and quality accident analysis, put forward the corresponding countermeasures, so as to provide reference for similar projects.
Key words:Bailey truss type hanging basket safety quality control countermeasure
工程概况
铜陵长江大桥北引桥跨无为内堤N4~N7#墩采用(47.35+80+47.35)m变截面预应力混凝土连续箱梁,梁部结构采用单箱单室直腹板箱形截面。箱梁顶板宽12.6m,两翼悬臂长2.95m,箱体宽6.7m。连续梁施工分为0~11#节段、合龙段、边跨直线段,最重悬浇节段为4#块,重量为136.5t。连续梁节段悬浇施工共投入四套挂篮,N5#、N6#墩分两个“T”构悬浇施工,采用贝雷桁架挂篮,主桁架采用贝雷片拼装,其余结构采用型钢、钢板加工。
1、挂篮的结构组成
贝雷桁架挂篮主要由主桁系统、底模系统、吊挂系统、走行系统、平衡及锚固系统五部分组成。主桁系统由贝雷片拼装而成,挂篮总长12m;底模系统:由纵梁、纵梁铰座和前、后下横梁组成整体平台,纵梁由型钢栓接而成;吊挂系统由底平台吊挂系统、内外导梁吊挂系统及底平台临时吊挂系统组成:底平台吊挂系统由前上横梁吊挂、后翼缘板吊挂、后底板吊挂及临时吊挂组成;外模吊挂系统由外导梁、前上横梁吊挂、后翼缘板吊挂组成;内模吊挂系统由内导梁、前上横梁吊挂、后顶板吊挂组成。……
