How many meters can be poured in the first floor of the 2 level of the surrounding rock of the railway tunnel?
This time you need to see the construction unit of customized templates or make a template for a few meters, such as the 6 template pouring 6 meters, 12 meters is 12 meters, but not more than 12 meters or less than 6 meters, the pouring of inverted arch lining 2, or a concrete filling or the floor, according to your concrete filling or bottom layer below is conducted when a one-time pouring process is only a few meters a few meters. You can take a look at TZ204-2008 "railway tunnel construction technical guide" fifth "construction method" learning
And these kinds of excavation methods need to determine the number of excavated meters according to the grade of surrounding rock. Tunnel invert and floor is completed after the initial support (that is, shotcrete, a layer of concrete, in the excavation of rock on some hard rock without vertical spray arch thin, weak surrounding rock shall be sprayed on the vertical arch thickness in this special project map will show) for pouring 2 reinforced concrete lining when left in general is 6~12 meters
6 excavation methods of tunnel1, full section method2 step method3, three steps of the 7 step excavation method4, septal wall method (CD method)5, the intersection of the next door method (CRD method)6, double side drift method
