隧道二衬中埋式止水带安装工艺的改进及新型加劲止水带的应用

The Improvement of the Installation Technology of the Embedded Waterstop Strip for the Second Lining of the Tunnel and the Application of the New Type of Stiffening Strip

高铁隧道二衬施工时可能在材料种类及数量、施工工艺选用等因素影响下出现埋设位置不够精准、中埋式止水带线型不一等问题。郑万高铁黄家沟隧道工程,纵向止水带采用U型托夹配合支杆定位、张拉,环向止水带采用T型筋精准定位;为更好的保证工作效果,采用了新型加劲止水带。工程实践表明所采取措施有效提升了中埋式止水带设置深度、结构平顺度及位置准确度,防水效果提升而工期缩短、经济效益良好。

During the construction of the second lining of the high-speed railway tunnel,there may be some problems.These include inaccurate embedment locations and the variations in the line types of the middle embedded waterstop strip due to the influence of factors such as the type and quantity of the materials and the chosen construction technology.In the Huangjiagou Tunnel of Zhengzhou-Wanzhou High-Speed Railway,the longitudinal waterstop strip is located and stretched with U-type bracket and strut,while the annular waterstop is precisely located with T-type rib.To further enhance performance,a new type of stiffening waterstop strip is implemented.Engineering practices have demonstrated that these measures taken effectively improve the setting depth,structural smoothness and position accuracy of the middle embedded waterstop strip,leading to enhanced waterproofing effect,reduced the construction durations and favorable economic outcomes.