昆仑山隧道洞内防排水及衬砌隔热保温层施工技术

Constructing Technology Research on Water-proof/Drainage and Heat Insulation Lining in Kunlunshan Tunnel of Qinghai-Tibet Railway, Tibetan Plateau

介绍了高原多年冻土世界第一长隧道———昆仑山隧道洞内防排水及衬砌隔热保温层的设计特点 ,通过材料性能优选和工艺试验 ,选定了适宜于高原多年冻土隧道洞内防排水及衬砌隔热保温层施工的材料 ,并制定科学、合理的施工方法和工艺 ,确保昆仑山隧道工程质量 .

Kunlunshan Tunnel on Qinghai-Tibet Railway, 1686m in length, the world longest permafrost tunnel on plateau ({4 600}～{4 800} m in elevation), is situated in permafrost region. Because of its special geography, harsh nature environment and complicated geological condition, water-proof/drainage and heat insulation for the tunnel are highly demanded. However, no successful experience for water|proof/drainage and heat insulation in such tunnels can be founded both at home and abroad, since the conventional methods cannot meet the needs of the tunnel construction. Hence, it becomes a typical and key structure for the design, construction technology and quality control. In this paper, the design characteristic of water-proof/drainage and heat insulation for plateau permafrost tunnel is put forward, which is laid between the initial lining supporting and final lining supporting with a structure of !compound water-proof plate plus heat insulation plate plus compound water-proof plate'. In order to ensure good quality of the tunnel, heat insulation materials like non-woven cloth and /PVC compound water-proof plate, PU polyurethane plate, type TN-1 polyurethane adhesion agent, OP resin emulsion are selected as the lining material for water-proof/drainage and heat insulation. They are frequently tested and selected in accordance with the needs and requirements of construction of plateau permafrost tunnel. In order to get an ideal result of water-proof and heat insulation, with no nails, water-proof plates are double-seams welded with thermo-welder, and heat insulation plates are sticked together with type TN-1 polyurethane adhesion agent. As reasonable construction method and technology such as water-proof/drainage and heat insulation lining is adopted in this tunnel, the quality of tunnel construction is guaranteed.