|
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--
how to negotiate leasing a new car
getting the best deal on a new car
new key fob for car
brand new car wrecked
5115 new car drive colorado springs
Copyright ?1998-2017 Technews Corp, All rights reserved
|
