The cutting work is mainly to pull the bottom work. Pulling the bottom is done in two steps. First, in the short patio excavated in the bottom column, dig the bottom roadway 5 meters above the floor of the tunnel, and then take the bottom road as the direction stone, and pull the bottom of the mine all open (expanded to the mine) Body boundary). Form a 2 m pull-out space and then pick it up. The height of the top is 2.5 to 3.0 meters. At this point, all the ore that has fallen out is transported out (released from the well-discharged well that has been dug in the bottom column). Finally, a 4.5 to 5 meter bottoming space is formed. After the entire bottoming space is formed, the reinforced concrete floor is built, and the thickness of the bottom plate is 0.8 to 1.2 meters. At this point, the cutting studio is completed and can be officially and resumed. Gate Valve,Resilient Butterfly Valve,Di Soft Seated Gate Valve,Socket Gate Valve SUZHOU YUEDA VALVE CO., LTD. , https://www.jsyuedavalve.com