现浇箱梁支架设计及力学分析

2020-03-13 08:11:21郝敏洁周鹏
科技创新与应用 2020年8期

郝敏洁 周鹏

摘  要:碗扣式钢管满堂支架是一種插口式组合支架,不但拼拆迅速、省力、通用性强,且整体性好、承载力高、安全可靠,其在工程中的应用日趋广泛。结合沈阳至康平高速公路项目,通过对现浇箱梁的碗扣式支架设计、模板安装等工艺进行总结,并对支架结构进行Midas/Civil数值模拟,验算支架的安全稳定性,为同行在类似环境施工或建模计算时,提供参考与借鉴。

关键词:现浇箱梁;碗扣支架;Midas/Civil;有限元分析

中图分类号:U445         文献标志码:A         文章编号:2095-2945(2020)08-0101-05

Abstract: Full cuplock steel tubular scaffolding is advantageous not only in good integrity high, jointstrength, bearing capacity and safety, but also function and construction efficiency, its' use of cuplock steel tubular scaffolding is becoming more and more common in the construction site. Combined with Shenyang to Kangping expressway project, through summarizing the design of bowl buckle bracket and formwork installation of cast-in-place box girder, and carrying out MIDAS/Civil numerical simulation of bracket structure, checking the safety and stability of bracket, providing reference for peers in similar environment construction or modeling calculation.

Keywords: cast-in-site box girder; cuplok formwork support system; Midas/Civil; finite element analysis

1 工程概况

沈阳至康平高速公路项目六王屯1号天桥,原路为村道砂石路,路基宽5.0m,引线与高速公路的交角为66°。桥梁跨径为25+35+25m。桥面净宽7.0m,设计角度为90°,桥梁总长度为92m。上部为预应力混凝土连续箱梁,下部为柱式墩,肋板台和桩基础。桥址区工程地质条件简单,场地稳定性好,场地未液化。

1.1 材料及布置

I10工字梁水平放置在可调支架上,纵向防止设10×10cm方木,现浇箱梁模板采用1.8cm厚竹胶板。箱梁内模支撑采用碗扣式满堂支架,支架立杆纵横距离均为90cm。

桥梁正中间留门洞,高5m,宽5m,与高速公路的交角为66°,门洞与高速公路主线中心线平行。门洞左右支架间距为30cm,I20工字钢纵向铺设支架可调顶托上,间距30cm,横向铺设I20工字钢,门洞上方架设HN400*200型钢。

1.2 结构特点

碗扣式满堂支架立杆纵向间距60cm,横向按照翼缘板90cm间距铺设;支架横杆布置步距为120cm。支架剪刀撑在纵桥向均按照间距6m设置,横桥亦然。斜撑与地面夹角控制在45°~60°,在顶层和底层按相同要求设置水平剪刀撑,水平剪刀撑间距不大于4.8m。……

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