Control apparatus and method for buoyancy adjustment of shield tunnel segments

A control apparatus for buoyancy adjustment of shield tunnel segments, the control apparatus comprising:

• an anchor rod including an axial accommodating cavity with a rear end opening, and a first slurry channel extending forward from an inner end wall of the accommodating cavity to an outer peripheral wall of the anchor rod, wherein the anchor rod is configured to be squeezed through a tunnel segment and into a formation;
• a countersunk bolt configured to be inserted into the accommodating cavity, wherein the countersunk bolt includes a second slurry channel extending from a front end to a rear end thereof, and the second slurry channel is configured to communicate with the first slurry channel;
• a locking mechanism configured to be located in the accommodating cavity to lock the countersunk bolt in the accommodating cavity;
• and
• a threaded connection structure configured to be screwed onto the countersunk bolt and, directly or through intermediate components, configured to push against the tunnel segment.