某大型条形封闭煤仓的网架安装技术

Space frame installation techniques of a large enclosed strip-shaped bunker

惠州荃湾煤炭码头建设2座大型条形封闭煤仓,单座长500 m、跨度118 m,上部展开约7.45万m^2的网架+檩条+高强压型钢板结构。网架采用正放四角锥双层三心圆柱面弧形网壳结构,主次檩条双层先后布置。结合项目特点及现场条件,为加快安装效率、提高安装精度,网架采用整体顶升工艺、分条分块顶吊工艺和高空散装工艺相结合进行安装。檩条采用地面预拼成榀、高空榀装工艺。通过对网壳上部结构进行全面、系统、全过程应力自动监测,同步进行网壳施工测量,确保安装质量和安全。可为水运工程类似项目提供范例和经验借鉴。

The Huizhou Quanwan coal terminal project constructed two large enclosed strip-shaped coal bunkers with a length of 500 m and a span of 118 m.The upper part of the bunker was deployed with a space frame of about 745 000 m^2,purlin and high-strength profiled steel plate structure.The space frame was constructed by orthogonal quadrangular pyramid double-layer three-center cylindrical arc reticulated shell,and the primary purlins and secondary purlins were arranged in two layers successively.In order to speed up the installation efficiency and improve the installation accuracy,according to the project characteristics and site conditions,the space frame structure was assembled with a combination of integral jacking,segmental jacking and bulk loading technology at high altitude.Purlins were pre-assembled on the ground into transverse segments and installed with high altitude assembly technology.In order to ensure the installation quality and safety,a comprehensive,systematic and whole process stress automatic monitoring of the upper structure of reticulated shells was carried out,and the construction survey of reticulated shells was carried out simultaneously.It can provide examples and experience for similar projects of waterway engineering.