| 摘要 |
PURPOSE: A construction method of concrete lining by dividing into top and bottom is provided to secure the stability and economical efficiency of concrete lining and to decrease the section of a tunnel by reducing the thickness of concrete lining. CONSTITUTION: The construction method of concrete lining by dividing into top and bottom comprises the steps of pre-constructing lower concrete lining(2) on the basis of a lateral wall inflection point(4) when placing concrete lining and to secure a support point of upper concrete lining(1) as a fixed support for reducing the stress occurred on the upper concrete lining, and after curing the surface of the lower concrete lining, filling up a space between a waterproof film and the lining(2) with grouting materials under pressure to secure the enough subgrade reaction factor for a plan for restraining the transformation toward an excavation plane by placing upper concrete lining.
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