Abstract: Due to the fact that commonly used turnouts can no longer fully meet the operational demands of urban rail transit in China, the Chengdu Rail Transit Line 19 phase II project used No.42 special damping single slip turnout for the first time. As a long and large irregular rail component, this type of turnout increases the difficulty of lifting, transportation and laying largely. To solve the construction technical difficulties of the No.42 special damping single slip turnout, it is necessary to study the laying key technologies. A calculation model for the hoisting process of the above turnout is established, and the hoisting process is monitored and tested, as well as the flatness detection after hoisting. Results show that under the hoisting scheme, the maximum stress of the turnout component is far less than its yield strength, and the maximum displacement met the construction requirements; the displacement monitoring data of the turnout is basically consistent with the simulated displacement results; after the hoisting, in the turnout passing longitudinal direction, the maximum rail surface irregularity is located at the joint clamp position, and the irregularity of other positions is less than 1 mm, which is in accordance with the allowable deviation of turnout static laying flatness; in the turnout passing lateral direction, the maximum absolute value of rail surface irregularity is 4 mm, which is located at the wheel load position, and slightly larger than the allowable deviation of turnout static laying flatness.