1. The box body of each sub-chamber of the upper and lower parts of the welded or bolted joints, diaphragm jigger wherever with water, gas jigger wherever with water, water seepage, leakage, leakage phenomenon is strictly prohibited. Strictly prohibited between the various wind chambers string wind, string water jigger, fine grain jigger and wind, contact parts? Jigger jigger water distribution is uniform.

　　2. Installation of safety protection facilities (sprocket cover, railing, walking platform board) and noise reduction devices