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某矿山主井井筒钢拱圈加固方案应用实践

Application practice of steel arch ring reinforcement scheme for main shaft of a certain mine

  • 摘要: 竖井作为矿山开采的咽喉关键工程,对于企业安全高效组织生产起着至关重要的作用。以某矿山主井井筒支护为研究对象,开展了钢拱圈加固井筒支护工程实践。通过对该井筒地层岩石构造、破坏机理分析研究、稳定性评价、技术经济对比等多因素评判,最终选择了主井井筒全断面钢拱圈加喷锚网支护设计方案。采用18a号热轧槽钢制作钢拱圈,竖向层间距为1 m;拱圈间竖向联结采用12号热轧槽钢,横向间距为1 m;钢拱圈采用ϕ38 mm圆钢利用下托上压进行固定,横向间距为2 m。喷锚网支护参数为0.8 m×0.8 m~1.0 m×1.0 m,单层钢筋网铺设,喷射C20混凝土,厚度以完全包裹圈梁和网片为基准。该工程项目集中停产55天分5次共计安装74架钢拱圈,既确保了工程质量,又大幅度缩短了绝对工期,同时也保证了主井井筒的稳固性及安全运行,为该矿区工程达产达标创造了有利条件,自加固治理结束至今井筒井壁未出现开裂、变形移位现象,足以说明该加固方案应用实践取得预期效果,希望为类似条件下的立井工程加固设计和施工提供参考。

     

    Abstract: As a key project in mining operations, vertical shafts play a crucial role in the safe and efficient production organization of enterprises. This paper took the main shaft support of a certain mine as the research object and carried out the engineering practice of steel arch ring reinforcement for shaft support. Through multi-factor evaluation such as the analysis of rock structure and failure mechanism of the shaft formation, stability evaluation, and technical and economic comparison, the design scheme of a full-section steel arch ring combined with shotcrete and anchor mesh support for the main shaft was ultimately selected. The steel arch rings were made of 18a channel steel, with a vertical layer spacing of 1 m; the vertical connections between the arch rings were made of 12 channel steel, with a horizontal spacing of 1 m; the steel arch rings were fixed with ϕ38 mm round steel by lower supporting and upper pressing, with a horizontal spacing of 2 m. The parameters for shotcrete and anchor mesh support were 0.8 m × 0.8 m–1.0 m × 1.0 m. A single layer of steel mesh was laid, and C20 concrete was used. The spraying thickness was based on completely wrapping the ring beams and mesh. In this project, the production was centrally shut down for 55 days, and a total of 74 steel arch rings were installed in 5 stages, which not only ensured the engineering quality, but also greatly shortened the absolute construction period. At the same time, it ensured the stability and safe operation of the main shaft, creating favorable conditions for the project in the mining area to reach the production standards. Since the end of the reinforcement treatment, there have been no cracking, deformation, or displacement phenomena in the shaft wall, which is sufficient to demonstrate that the application practice of the reinforcement scheme achieves the expected target effects. It is hoped to provide a reference for the reinforcement design and construction of vertical shaft projects under similar conditions.

     

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