Standard for clearing ground foundation of tunnel

Whether the foundation surface meets the requirements, the bottom plate is free of scum and the cave wall is free of dust. Check the station numbers of the starting and ending points of each warehouse (each warehouse 12m). Foundation cleaning requires that there are no loose stones on the foundation surface, and then clean it with a high-pressure feng shui gun until there are no slag, sundries and water. Manually cooperate with slag scraper and agricultural vehicle to transport the slag out of the hole.