大跨度空间管桁架分区连续累计卸载施工技术

Construction Technology of Partial Continuous Cumulative Unloading of Large-span Space Pipe Truss

马鞍山通航枢纽试验厅项目采用大跨度空间管桁架结构,桁架安装采用地面拼装、高空安装的方法进行,桁架安装时需在地面设置临时支撑。考虑工期及成本因素,桁架卸载采用"分区连续累计卸载"的施工工艺,并通过MIDAS/Gen受力软件对其安全性与可靠性进行验证。桁架卸载时通过调节千斤顶的行程实现分区内同步、区间连续卸载并全程进行测量监控。该卸载技术在节约工期及成本方面效果显著。

Maanshan navigation project adopts a large-span space pipe truss structure. The truss installation adopts the method of assembling on the ground and installing at high altitude. The truss installation needs temporary support on the ground. Considering the time limit and cost factors, the truss unloading applies the construction technology of ＇ partial continuous accumulative unloading＇ , and the safety and reliability are verified by the MIDAS/Gen software. The truss unloading is realized by adjusting the stroke of the jack to achieve synchronous unloading in the partition and continuous unloading between the partitions while monitoring the entire process. The unloading technology has obvious advantage in saving time and cost.