Abstract
A holding device with a chain net was used to automate the removal of wave-dissipating blocks, thereby reducing labor.
Shape of wave-dissipating blocks are more than 40. The most difficult block to be removed was shaped like a combination of two anchors. The author tried to remove a pile of the blocks in the model experiment using the holding device with a chain net. It was possible to remove the blocks successively through adequate observation of the situation, taking into account the posture change of each block during lifting to eliminate entanglement with the surrounding blocks. As a result of the trial calculation of time efficiency based on the model experiment, the removal method for anchor-shaped blocks using a holding device was more efficient than standard time efficiency for general blocks.
