京张高铁东花园隧道喷涂式防水设计施工技术

为提高隧道防排水技术的水平，实现喷涂式防水的定量化设计，以京张高铁东花园隧道工程为背景，研究隧道喷涂式防水喷层厚度的影响因素，主要包括工程防水等级、设计使用年限、地下水状况、隧道纵坡方向、隧道所处环境及喷涂施工方式等；提出了喷涂式防水的定量化设计方法，基于隧道不同部位喷层厚度基本值与建议值，进行加权修正最终确定防水层厚度；提出适用于明洞隧道的全封闭喷涂速凝橡胶沥青防水体系，并成功应用于东花园明洞隧道防水设计中。研发隧道自动化喷涂防水设备，通过电脑控制走行装置和喷涂机械手实现了喷涂防水施工自动化，替代传统人工喷涂方式。经实践证明，机械喷涂效率为人工喷涂的4倍，检验防水合格率达到100%。

Spray type Waterproof Design and Construction Technology of Donghuayuan Tunnel on Beijing Zhangjiakou High speed Railway

It is urgent to improve the level of tunnel waterproof and drainage technology and realize the quantitative design of spray type waterproof. As a result, taking Donghuayuan Tunnel of Beijing Zhangjiekou High speed Railway as an example, the influencing factors such as the thickness of spray type waterproof coating, including the engineering waterproof grade, design service life, groundwater condition, tunnel longitudinal slope direction, tunnel environment, spraying construction method, etc., are analyzed. The quantitative design method of waterproof is proposed, which 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 spray type quick setting rubber asphalt waterproof system suitable for open cut tunnel is proposed, which has been successfully applied to the Donghuayuan Tunnel waterproof design. The tunnel automatic spraying waterproof equipment is developed, and the spraying waterproof construction automation is realized through the computer controlled running device and spraying manipulator, which can replace the traditional manual spraying method. The practice shows that the mechanical spraying efficiency is 4 times of that of the manual spraying, and the qualified rate of waterproof inspection reaches 100%.