Metro tunnel large-section horsehead supporting structure and construction method thereof

• Main Authors: ZHANG BIN, GAN MANQUAN, LUO WEIDONG, WU XIN, LIU JIANZHENG, GUO SHIHAO, LAN MINGLIN
• Format: Patent
• Language: Chinese; English
• Published: 01.08.2023
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

The invention discloses a metro tunnel large-section horsehead supporting structure and a construction method thereof.The metro tunnel large-section horsehead supporting structure comprises a surrounding rock supporting structure, a grating steel frame configured with a horsehead position and an anchor rod inserted into the inner side of surrounding rock, and the grating steel frame and the anchor rod are used for interfering deformation of the surrounding rock in the stress system conversion process; the temporary supporting structure is provided with a transverse supporting beam, a longitudinal supporting column and an inclined strut which are connected into the surrounding rock supporting structure and used for supporting the tunnel surrounding rock and the supporting structure. Surrounding rock of a horsehead section is adopted for advanced reinforcement, horsehead concrete is broken, and a horsehead opening is formed; a sprayed concrete leveling layer is arranged, and after initial setting of concrete, a