利用老矿井原采用的工字钢支腿Π形梁支护所遗留的大量工字钢支腿,装配单圆弧U形钢可伸缩拱顶,实现支护的可伸缩性,避免老矿井大量工字钢支腿的上井和废弃,节约资金。根据现场提供的条件和要求,对U形钢可伸缩拱顶进行了结构设计,并根据有关标准对结构进行了仿真有限元受力分析和现场试验,开发了工字钢支腿加配U形钢可伸缩拱顶的支护方式。 The use of a large number of I-beam legs left by the original I-beam leg Π-beam support used in the old mine, assembly of a single arc U-shaped steel telescoping dome to achieve the scalability of the support, to avoid a large number of old mines I-beam leg up and abandoned, saving money. According to the conditions and requirements provided on the site, the structural design of the U-shaped steel telescopic dome was carried out. According to the relevant standards, the structure was simulated by finite element analysis and field test. The I-beam leg and the U-shaped steel Retractable dome support method.