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- Keywords special thick alluvium;drilling shaft bottom;snick;optimally central angle;model test; 特厚表土层;钻井井壁底;削球式;最佳圆心角;模型试验;
- Keywords special thick alluvium;drilling shaft bottom;semiellipse rotation type;hemisphere and snick type;optimizing scheme; 超深表土;钻井井壁底;半椭圆回转式井壁底;削球式井壁底;方案优化;
- drilling shaft bottom 钻井井壁底
- All its assets is over 3 millon Yuan,RZ series of soft-rock drilling shaft are patent production of Ministry of Coal. 生产的RZ系列软岩钻杆是国家煤炭部通过技术鉴定的专利产品。
- Based on the test results, the design method of vertical bearing capacity of the retractable drilling shaft lining was obtained. 由此提出了可缩性钻井井壁竖向承载力的设计方法。
- The analyzed the features and difficulties of the support for goaf left by small coal mine in the mine shaft bottom of Shuguang Mine. 分析了曙光煤矿井底车场小煤窑遗留采空区支护的特点和难度,提出采用注浆加固、高强度锚杆、再配合预应力锚索支护方案。
- Huainan Banji coal mine introduces precasting in Main Shaft and ventilation shaft,and drilling shaft lining is precast construction in ground. 淮南板集煤矿主井与风井采用钻井法凿井,钻井井壁在地面预制施工。
- Aiming at the fractured mechanism of mine shaft lining under the condition of stratum subsiding, a new type of retractable drilling shaft lining structure was proposed. 针对地层沉降条件下煤矿立井井壁的破坏机理,提出了一种新型可缩性钻井井壁结构。
- According to practice experience expounds that in outsize mine the capital control lead line of shaft bottom should be 5 second rank,and builded onetme before putting into production. 结合自身的实践经验阐述了特大型矿井井下基本控制导线的等级应为5”级,应在矿井投产时一次建成。
- cleaning main shaft bottom falled coal system 井底清理撒煤系统
- An experimental study of mechanical characteristics of drilled shaft was carried out by resemble material. 用相似材料对钻井井壁底的力学特性进行了实验研究。
- A shaft on which a working tool is mounted, as in a dental drill. 心轴用于安装工具的蕊棒，如牙钻蕊棒
- The drilling troops mustered on the hill. 演习部队在小山上集合起来了。
- They sent the enemy ship to the bottom of the sea. 他们把敌舰击沉。
- The child was sitting on the bottom stair. 那孩子正坐在楼梯最下面的一级上。
- I intend to get to the bottom of it. 这件事我打算寻根究底。
- He was always bottom of the class in maths. 他的数学成绩在班上总是垫底。
- The workman is drilling in the wall. 工人正在墙上打孔。
- The dregs have settled at the bottom of the bottle. 渣滓都沉到瓶底了。
- Drilling is cutting a hole with a drill. 钻削就是用钻头钻一个孔。
