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一、支护改革历史背景和发展过程1964年前我局采煤工作面和采区巷道几乎全部采用木支护,坑木用量大,抗压强度低,安全状况不佳,生产效率低,严重制约了煤炭生产的发展。我局支护改革大体经历了三个发展阶段。1.支护改革的缓慢发展阶段。从1964～1977年,是摩擦式金属支柱在回采工作面推广、使用、发展的14年,同时也在巷道试验推广水泥预应力支架、梯形金属支架的阶段。直到1977年末仍有10个木支护工作面。企业坑木万吨耗高达114.3m~3,在全国统配煤矿居落后地位。
I. Historical Background and Development Process of Supporting Reform Nearly all timber support was adopted for coal mining face and roadway in mining area before 1964. Large amount of pit timber, low compressive strength, poor safety condition, low production efficiency and serious Restricted the development of coal production. Our bureau supports the reform basically went through three stages of development. 1. Support the slow development stage of reform. From 1964 to 1977, Friction Metal Pillar was promoted, used and developed in the working face for 14 years. At the same time, cement prestressed stents and trapezoidal metal stents were also applied in roadway tests. Until the end of 1977 there are still 10 wood support face. Enterprises pit wood tons consumption up to 114.3m ~ 3, coal mines in the country after the concession status.