Why is the rotary drilling rig put into the steel cage before pouring?
Because the steel bar is not properly installed first, it must be easier to put the steel cage first. The CFA method is very special, is through a hollow pipe concrete long spiral, if you pull out the long spiral after reperfusion may hole collapse, there will be holes in the soil sediment, not net, so through the middle of the air directly to the bottom of cast-in-place concrete
Because the concrete filled steel cage and buried depth of pipe is larger, the upper concrete pouring for a long time, has been the initial setting, formed on the surface of shell, concrete and steel reinforcement cage has a grip, if not timely catheter at the bottom of reinforced concrete in the bottom mentioned above, the catheter outflow will to a certain speed on the top, also driven up steel cage.
When pouring concrete to the reinforcement cage, if this time to improve the catheter, catheter at the bottom of the reinforcement cage distance is only about 1m distance, due to pouring concrete pipe after homing large impact force, promote the rebar cage floating;
