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一、前言 1983年和1984年英国国家煤炭局花费了135百万英磅用于巷道金属支架。这些费用包括拱顶、夹板、支柱、可缩性拱脚和背板等的消费。另外,在这期间巷道的开拓用了2.9百万个人班,巷道的维护工作用了2.2百万个人班。 近几年来对于支架的几种改进型式进行了现场试验,其中包括浇注水泥浆外壳、TH拱和环形支架。这些改进形式主要适用于巷道的掘进。尽管这些方法给自由固定支架的传统方法带来微小的变化,但基于这种全新的探索研究还要力争取得一定的突破。
I. Preface In 1983 and 1984, the British National Coal Administration spent 135 million pounds on aisle metal supports. These costs include vaults, plywood, pillars, retractable arches and backsheets, and more. In addition, during this period, the development of roadway used 2.9 million personal classes and the tunnel maintenance took 2.2 million personal classes. In recent years, several improvements on the stent were field tested, including the casting slurry shell, TH arch and the ring bracket. These improvements are mainly applied to tunneling. Although these methods bring slight changes to the traditional method of free-standing stents, some breakthroughs are still to be made based on this completely new exploration and study.