摘要
立井施工是一个复杂的系统工程,包括凿岩、爆破、出矸、提升、绑扎钢筋、立模、砌壁、浇筑等关键工序。从1958年施工的石嘴山矿务局立井,作为宁夏地区第一座立井(深473m),到目前施工的宁夏煤业公司羊场湾煤矿848.7m立井(净直径9.4m、净断面69.4m2),宁夏宝丰能源集团红四煤矿997m立井(净直径7m、净断面38.46m2),宁夏地区立井施工历经60年发展历程。本文以金家渠煤矿立井工程为例,探讨冻结、爆破、立模、砌壁等关键工艺,确定表土层段辅助孔冻结深度30~35m、主孔圈冻结深度482~497m,冻结圈径12.9~17.4m,冻结期间获取的各项造孔参数齐全可靠;采用2台中心抓岩机+1台电动防爆挖机,实现“两抓一挖”高效装岩目标,每循环缩减装岩时间约4h;采用金属组装“倒模”连续砌壁作业方式,将段高由当时区内最高3.5m提高至3.7m,使混凝土浇筑效率得到提升,为宁夏地区立井施工积累了宝贵经验。
Vertical shaft construction is a complex system engineering,including drilling,blasting,gangue,lifting,assembling reinforcement,formwork erection,wall building,pouring and other key processes.From the vertical shaft of Shizuishan Mining Bureau constructed in 1958,as the first vertical shaft(473 m deep)of Ningxia region,to the 848.7 m vertical shaft(9.4 m net diameter and 69.4 m2 net section)of Yangchangwan Coal Mine of Ningxia coal industry company,and the 997 m vertical shaft(7 m net diameter and38.46 m2 net section)of Hongsi coal mine of Ningxia Baofeng energy group,the vertical shaft construction in Ningxia region has experienced 60 years of development.Taking the vertical shaft engineering of Jinjiaqu Coal Mine as an example,this paper discusses the key technologies such as freezing,blasting,formwork erection and wall building,and determines the freezing depth of the auxiliary holes in the topsoil layer is30~35 m,the freezing depth of the main hole circle is 482~497 m,and the freezing circle is 12.9~17.4 m.During the freezing period,all the hole-making parameters obtained are complete and reliable;two central grab loader+one electric explosion-proof excavator are used to achieve the goal of"two grabbing and one digging"high-efficiency rock loading,reducing the rock loading time for about 4 h per cycle;the metal assembly"inverted formwork"continuous wall building operation mode is used to increase the section height from the highest 3.5 m in the area at that time to 3.7 m,which improves the concrete pouring efficiency,and accumulates valuable experience for the vertical shaft construction in Ningxia region.
作者
吕兆海
赵文华
赵长红
蒋学明
林金川
王震
刘晓辉
LYU Zhaohai;ZHAO Wenhua;ZHAO Changhong;JIANG Xueming;LIN Jinchuan;WANG Zhen;LIU Xiaohui(Ningxia Coal Industry Co.,Ltd.,CHN Energy,Yinchuan,Ningxia,750001;Ningxia Baofeng Energy Group Co.,Ltd.,Yinchuan,Ningxia,750001)
出处
《能源科技》
2020年第5期14-20,共7页
Energy Science and Technology
关键词
宁夏地区
深立井
冻结
吊盘
伞钻
大直径
Ningxia region
Deep vertical shaft
Frozen
Hanging scaffold
Umbrellas driller
Large diame⁃ter
