Question about rotary drilling, what about clogging of concrete in conduit inside a grouted bored pile? How about as far as possible in order to reduce economic losses?

First of all, analyze the reasons for this problem, there are only two: one is the conduit is buried too deep, and the second is the filling of too long a time to stop. To provide you with the following methods, you may wish to try, it should be said that under normal circumstances can be effective: 1, with the crane up and down back and forth to save the conduit. 2, with the digging machine gently smashed down the conduit, and then save the crane up and down. The purpose of the above is to loosen the concrete inside the conduit.3,Add a big hopper at the mouth of the conduit, which is filled with enough concrete to satisfy the 3-5 meters pile at one time, and then carry out the action similar to sealing the bottom, relying on the impact of the concrete itself, and at the same time, increase the pressure of the concrete inside the conduit, so as to make the lower concrete loosened. If the above action can't solve the blockage problem, it seems that the pile is really broken. But in general, after such treatment can solve the problem. I have been in the engineering industry for more than 20 years, specializing in playing the rotary drilling rig, but also nearly 10 years, a similar situation appeared quite a few times, mostly because of the filling is too smooth, the construction workers forget, resulting in buried pipe is too deep, and individual even more than 18 meters, but also due to the concrete supply from the party in a delayed problem, consistent with the final blockage phenomenon, but finally were successfully resolved, which is very key to determination, as long as not easily give up, and finally will have a way to solve the problem. Finally there will be a way to solve.