Abstract:

 In order to improve the level of tunnel waterproof and drainage technology and realize the quantitative design of spray type waterproof, taking donghuayuan tunnel project of Beijing-Zhangjiakou high-speed railway as the background, this paper studies the influencing factors of the thickness of spray type waterproof coating, mainly including the engineering waterproof grade, design service life, groundwater condition, tunnel longitudinal slope direction, tunnel environment and spraying construction method, etc The quantitative design method of waterproof is based on the basic value and recommended value of spray layer thickness at different parts of the tunnel, and the thickness of waterproof layer is finally determined by weighted correction; a fully closed spraying quick setting rubber asphalt waterproof system suitable for open cut tunnel is proposed, which is "surface treatment + self waterproofing of lining structure + spraying waterproof layer, protective layer, leveling layer + joint waterproof", and has been successfully applied to the east garden Tunnel waterproof design. The tunnel automatic spraying waterproof equipment was developed, and the spraying waterproof construction automation was realized through the computer-controlled running device and spraying manipulator, which replaced the traditional manual spraying method. The practice shows that the mechanical spraying efficiency is 4 times of the manual spraying, and the qualified rate of waterproof inspection is 100%.

Key words: Beijing-Zhangjiakou high speed railway, Spraying quick setting rubber asphalt, fully enclosed waterproof, open cut tunnel, new waterproof material, waterproof design