The invention provides a high-speed railway large-
diameter shield tunnel
overhead line system channel construction method. A channel mechanism is made and installed to a
pipe piece. A wedge-shaped ring
pipe piece is adopted as the
pipe piece. The point position for installing the pipe piece is selected according to the shield
tail clearance distance. When shield driving is conducted to the presetlength and the
stroke of a thrust oil cylinder in the position where a capping block is planned for installation is larger than the preset
stroke length, a
shield tunneling machine stops driving, andthe pipe piece is installed. After installed in place, a pipe piece block stretches out to a corresponding position, the thrust oil cylinder of a pipe piece installation
machine pushes the pipe piecetightly, pushing force of the thrust oil cylinder is higher than preset stress needed by pipe piece stabilization, and then the pipe piece installation
machine is moved away. After a pipe piece ring is separated from a shield
tail, a pipe piece connection bolt is fastened for the second time. Through the construction method, construction environment during installation of an electrical
system is improved significantly, installation construction efficiency of an electromechanical
system is improved, a tunnel structure is not damaged basically, and the structure service life is prolonged.