Application of Raise Boring Machine in Vertical Shaft Construction of Jiyi Tunnel on Menghua Railway
The Jiyi Tunnel of Menghua Railway has a total length of 15 417 m and is a high gas tunnel,with a total of 4 ventilation shafts arranged.The tunnel adopted the reverse well method to construct the vertical shaft,and combined with the specific engineering situation,used the positive circulation down-hole hammer technology for guide hole construction,the raise boring machine for hole expansion construction,and after installing the shaft frame,anchor mesh spray support was adopted,ultimately forming a vertical shaft with a diameter of 2.0 m.Practice shows that the deviation angle after the construction of the vertical shaft is relatively small,and the construction effect of the No.4 vertical shaft is good,with a deviation rate of no more than 0.2%.This project has high construction efficiency and is currently the construction practice in China with the largest depth of single well completion using the raise boring machine.
raise boring machineMenghua RailwayJiyi Tunnelvertical shaft construction
NETL
NSTL
万方数据
