Chimney Brushing: Methods for Cleaning and Repairing the Exterior Wall of a Buoy Marker Tube
During the chimney painting with navigation mark construction, there are two hoisting plates, each requiring only one person and capable of carrying up to 15kg of paint. Each lifting plate is suspended from the top maintenance platform, with the operator's movements controlled by ground personnel. The ground control method involves setting up a 2T guide pulley, wrapping a φ24 manila rope around the movable pulley, with the movable counterweight exceeding 200kg and at least two people controlling the rope ends. For safety, a Φ18 manila rope is set up as a safety line at the hoisting plate location, with the top fixed to the tower top maintenance platform and the bottom to the A-frame column. The operator's safety line is secured to the safety line with a movable knot, which automatically locks when subjected to sudden force. During the operation of bending the cylinder's outer wall, the workers cannot get close to the cylinder's outer wall under the force of gravity. External force should be used to bring the operator close to the outer wall for easier painting. Therefore, a sliding track with a steel wire rope must be set up at each lifting plate. A 110-meter steel wire rope is used, with the top fixed to the tower top maintenance platform and the bottom to the ladder's A-frame column. A 2-ton tensioning device is used to pull the wire rope tight, ensuring safety and adherence to the cylinder wall. During the operation, a horseshoe buckle is set up on the hoisting plate to allow the plate to slide along the wire rope, ensuring that the navigation personnel's chimney brush always stays close to the cylinder wall.