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1986年,我局古书院矿采用HDC-π型钢梁,配以DZ-22型单体液压支柱管理高档普采面柔性顶板获得成功,不仅使金属网柔性顶板工作面的安全得到改善,还简化了工序,减轻了工人的体力劳动,实现了高产、高效,显著地提高了经济效益,年平均增产27.6万吨,平均生产提高132％,吨煤成本下降52.8％,平均增加税利876万元。目前,已在阳泉、汾西、肥城、龙口、鹤岗、新密、铜川等14个局矿得到推广应用。
In 1986, the successful use of HDC-π steel girder with the DZ-22 type hydraulic pillar to manage the high-grade generalized face flexible roof achieved the improvement of the safety of the metal mesh flexible roof work surface. Simplified the process and lightened the manual labor of the workers, achieved high output and high efficiency, and markedly improved economic benefits. The average annual output increased by 276,000 tons, the average production increased by 132%, the cost per ton of coal decreased by 52.8%, and the average increase of tax profits by 8.76 million yuan . At present, 14 Bureau mines have been popularized and applied in Yangquan, Fenxi, Feicheng, Longkou, Hegang, Xinmi and Tongchuan.