混凝土塔柱施工外观质量控制技术  

Visual Quality Control Techniques Used to Concrete Pylon Column Construction

作　　者：韦理仁[1] 张家伦[1] 陈新[1] 

机构地区：[1]中铁大桥局集团第四工程有限公司,江苏南京210031

出　　处：《世界桥梁》2016年第2期20-24,共5页World Bridges

摘　　要：为提高城市桥梁混凝土塔柱的外观质量,以江顺大桥桥塔塔柱施工为例,对塔柱施工中混凝土外观质量控制的关键技术进行研究。结合塔柱结构特点合理进行模板分块,分块拼缝采用企口缝形式,并对圆弧倒角钢模与木模的连接进行优化处理;WISA面板与木工字背肋的连接采用反面打钉的连接方式;模板底口除了设置拉杆,还设置了预埋爬锥+精轧螺纹拉杆,起到双重收紧效果;制作桥塔塔座试验块,通过对比选择脱模剂,最终选用色拉油作脱模剂;塔柱混凝土施工中,设置与塔柱壁厚等长的方木作为内支撑,保证模板顶口宽度,模板顶口施工缝处通长水平钉设木条控制平整度。设计"洗泵循环系统",有序排放废水。通过采取以上措施,江顺大桥桥塔塔柱最终达到内实外美的目标。To improve the visual quality of concrete pylon columns of urban bridges,the construction of the pylon columns of Jiangshun Bridge was cited as an example,to study the key visual quality control techniques used during the pylon column construction.The formwork was rationally divided according to the structural characteristics of the pylon columns,the joints between every two divisions adopts tongue-and-groove joints,and the connection of the arc-chamfered steel formwork and the timber formwork was optimized.The WISA plate and the I-shaped timber back ribs were connected by nails driven from the opposite side.Besides the tie rods,there are embedded climbing cones and fining twisted steel bars installed at the base opening of the formwork,aiming to gain the twofold tightening effect.A testing block of the pylon saddle was prepared,comparison was made among different mold release agents,and the salad oil was finally chosen as the release agent.During the construction of the pylon column concrete,the timbers with length equal to the thickness of the pylon column walls were used as inner shoring,to ensure the width of the formwork top opening.The horizontal nails in the construction joints at the top opening of the formwork were backed by through-length battens to control flatness.A pump washing cycling system was designed for the ordered draining of waste water.By taking the aforementioned measures,the pylon columns of the Jiangshun Bridge were constructed to be solid columns with pleasing surfaces.

关 键 词：桥塔 混凝土结构 液压爬模施工 模板 混凝土浇筑 外观 质量控制 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]