以中美两国砌体结构技术标准为研究对象,从标准体系、逻辑结构和具体条款等方面出发,对比了中国GB 50003—2011《砌体结构设计规范》和美国ACI530—2011《砌体结构规范》的异同,阐述了两者的特点及差异,分析了各自的细致程度及对工期、造价等的影响,分析结论可为国际工程顺利开展提供技术支持和履约保障。

For the backfill hydraulic support as the key equipment for achieving integration of backfilling and coal mining simultaneously in the practical process, its characteristics will directly influence the backfill body's compression ratio. Horizontal roof gap, as a key parameter of backfilling characteristics, may impact the backfilling effect from the aspects of control of roof subsidence in advance, support stress, backfilling process and the support design. Firstly, the reason why Horizontal roof gap exists was analyzed and its definition, causes and connotation were introduced, then adopting the Pro/E 3D simulation software, three typical 3D entity models of backfill hydraulic supports were built, based on the influence of Horizontal roof gap on backfilling effect, and influence rules of four factors, i.e. support height, suspension height, suspension angle and tamping angle, were emphatically analyzed on Horizontal roof gap. The results indicate that, the four factors all have sign...

以寻找液压制动防抱死系统(ABS)的薄弱环节,及出现故障时更加快速的找到故障位置为研究目的,对液压ABS系统的组成和原理进行分析,采用故障树分析方法。以ABS系统发生故障为顶事件建造故障树,对故障树进行定性分析,找出ABS故障树的最小割集,定量分析底事件发生故障的概率及重要度,最后算出各中间事件发生故障的概率。根据各系统发生故障概率的大小,可以为ABS系统故障时的诊断及排查顺序提供合理建议,减少故障诊断过程中的不必要操作,提高了诊断效率,为系统部件的优化与改进提供一定参考价值。

在保持GZY-50型钻机的机构的基础上,将它改造成水平钻机,特别是针对它的液压系统进行改造,使之液压系统的功能满足水平钻机的要求.主要是对钻机的回转回路、提升加减压回路和辅助回路的改造来达到设计要求.