双层钢网架提升关键尺寸指标控制与监测技术

KEY DIMENSIONAL INDEX CONTROL AND MONITORING TECHNIQUE OF DOUBLE-LAYER STEEL GRID LIFTING

某大型单层工业厂房项目屋面结构为大跨度连跨双层钢网架结构,整体采用“地面分区拼装–分区不等位整体多段提升–分阶段补杆–整体同步卸载–按顺序依次拆除提升支架/补杆(定位)”的施工方法完成施工工作,描述基于此施工方法,如何通过对关键尺寸指标的考虑、控制和“应力–应变”监测技术的应用,安全地完成施工工作进行描述,最终确保结构整体承载满足设计要求,保证了结构安全。所描述方法和各施工阶段需要考虑的问题与解决方式可应用在大跨度屋面网架结构整体提升施工中,亦可根据项目规模不同,按此方法规律分析后指导其他类此工程施工工作。

A large single-floor industrial plant adopts wide and multi-span double-layer steel grid structure. The construction method of ground assembly, divided uneven integral lifting, compensation rod setting in different phases, integral synchronous unloading and ordered dismantlement of lifting support/compensation rod(positioning) was adopted to discuss how to satisfy the structural bearing capacity design requirements through consideration and control of key dimensional indexes and application of stress-strain monitoring technique. The integral bearing capacity of structure and structural safety were guaranteed. This method and solutions adopted at different construction phases are applicable to widespan roof grid structure integral lifting and guide construction of similar projects after analysis according to the law of this method.