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辽宁煤矿建设局建井一处在大桥立井施工中,开始对松软岩层地压规律认识不足,建井进度缓慢,且外壁经常来压开裂。通过实践总结,逐渐掌握了软岩地压规律,改变了施工方法及井壁结构形式,从而加快了主、副、风井的建井速度,提高了工程质量。如主井注浆封水后,于1981年2月开始在松软岩层基岩施工,经过9.92个月完成立井井筒353.2米及两个水平马头门预留19米,各项经济指标完成较理想:平均月成井35.6米;最高月成井51.5米;掘进效率3.01米~3/工;砌壁效率0.69米~3/工;每米井筒成本4323元;工程优良品率占89％;全员劳动生产率1～11月为3143元(要求2937元)。
In the construction of vertical shafts in the bridge, the construction of Liaoning Mine Construction Bureau began to lack understanding of the pressure laws of loose rock formations, and the well construction progress was slow, and the outer wall often pressed and cracked. Through practical summary, we gradually grasped the law of soft rock pressure and changed the construction method and the form of shaft lining structure so as to speed up the well construction speed of the main, auxiliary and wind shafts and improve the project quality. After the main shaft was sealed with grouting water, construction of bedrock in soft rock began in February 1981, completing 353.2 meters of vertical shaft and 19 meters of two levels of Ma Taumen after 9.92 months. All economic indicators were completed satisfactorily : The average monthly well completion 35.6 meters; the highest monthly yield 51.5 meters; tunneling efficiency of 3.01 m ~ 3 / workers; wall efficiency of 0.69 m ~ 3 / workers; well cost 4323 yuan per meter; project quality products accounted for 89%; full staff Productivity 1 to November 3143 yuan (2937 yuan required).