|
The concrete (usually with steel bar) is poured directly into the stable and solid roadbed, and the new line of ordinary sleeper and gravel bed is not used. This kind of line is clean, suitable for large volume and difficult maintenance area, especially for tunnel, underground railway, port wharf and stone road base. But its construction investment is big, if because of the construction slapdash or basement instability, concrete layer fracture, cure difficulty. China's overall Taoist route in the tunnel is more than 300 kilometers long
New Car Buying Tips--
france handball champion du monde
top tier champions
tirage au sort ligue champions
ligue des champions 2014-15
championna de france
Copyright ?1998-2017 Technews Corp, All rights reserved
|
