圆角现浇箱梁侧模形式分析比选
2012-09-06张东宣恒李鑫国
张东 宣恒 李鑫国
【摘要】混凝土连续箱梁桥以其抗弯刚度大、承载力好、结构经济等优点在公路工程桥梁建设中被广泛采用。如何使该种结构形式更趋合理、外观更加完美,已成为近年来的研究发展方向。箱梁底部的棱角、腹板和翼板的交界阴角采用圆角的效果不错,有利于美观,避免了线形不顺带来的外观瑕疵。但这种对外观的高要求因施工工期及施工成本控制等因素对各工序的施工方法形成了影响,而模板施工最为关键。
【关键词】 箱梁;圆角;对比
[Abstract] concrete continuous box girder bridge with its bending stiffness and bearing capacity, structural and economic advantages of the bridge construction of highway projects has been widely adopted. How to make the structure more reasonable, more perfect appearance, has become in recent years, research and development direction. Rounded corners effect is good, beautiful, and to avoid the appearance of defects of the linear ring true brought the edges and corners of the box girder at the bottom of the web and the flange of the angle at the junction of Yin. But this appearance due to the construction schedule and construction cost control, and other factors formed on the construction methods of the various processes that affect the most critical, and template construction.
Key words: box girder; rounded; contrast
中图分类号:TU37文献标识码:A 文章编号:
在现浇箱梁模板施工中,侧模模板一般采用钢制模板或木制模板,本文拟对箱梁底部棱角、腹板和顶板的交界阴角均采用圆角形式的箱梁S型侧模模板进行设计,从施工难度、施工效果、成本分析等方面进行方案比较。
因圆角处的外观效果直接影响整体结构的美观,若圆角处采用木制模板,一是圆角木模加工难度大,二是圆角木模制作精度难以满足要求,设立支撑并浇筑混凝土时,容易变形,平顺度极难控制。故圆角处宜采用钢制模板,可按照下面三种方法根据工程实际情况综合进行选择。
1、方案一:圆角处、腹板、翼板采用整体钢制模板
模板施工示意图如下:
(1)优点:
整体侧模厂家定制,尺寸精度高,拆模后外观效果佳,因侧模整体性好,支撑点布置较简单,宜操作。
(2)缺点:
①因各工程箱梁外形设计有差异,模板重复利用率低,模板材料成本较大。
解决对策:……p>
