The bottom level is located 2-3 meters above the transportation roadway, and the section of the bottom roadway is 1.8×2.0～2×2m2.
On the basis of the side of the Ladi, extend to the boundary of the mine to both sides of the mine. A layer of 0.3-0.5 m thick reinforced concrete shall be poured on the bottom plate of the bottoming area as the protective layer for the next stage of recovery.
(ie the second method of pulling the bottom - leaving the bottom of the column to pull the bottom method)
(2) The method of pulling the bottom can be divided into two methods: bottomless bottoming method and bottomed bottoming method:
1) Bottomless bottom method: (artificial bottom column)
â‘ without sill pull method is applied to the bottom narrow vein mining precious metals.
2 The bottoming method is to start from the transportation lane, within the scope of the mine, open the roadway, expand to the boundary of the mine, and then top up, so that the total height reaches 5-6 meters. After the ore is transported out, a 0.3-meter-thick reinforced concrete floor is laid on the bottom layer, and the flat road is manually poured on the floor. The other space is filled with the filling material, and the bottom plate of 0.2 m thick is poured.
2) The method of pulling the bottom column
On the top of the transportation roadway, there is an ore bottom column of about 2-3 meters, and the bottom column is pulled down. Mom first tunnels a cutting roadway (short lane) from the contact side of the well and connects with the ore discharge shaft to facilitate the use of the slippery well. mine. The bottom of the cutting roadway is used to form a bottoming space with a height of 2 to 2.5 meters on the basis of the bottoming roadway. Then cast a layer of reinforced concrete floor with a thickness of 0.3 to 0.5 m.
The above two methods of pulling bottom each have their own advantages and disadvantages.
The advantage of the bottomless column bottoming method is that it can eliminate the difficulty of recovering the bottom column and improve the ore recovery rate.
The disadvantages are: heavy work, heavy labor and low efficiency.
The advantage of the bottoming column bottoming method is that the efficiency is high, and the impact on the transportation work of the roadway is small when the bottom is pulled.
The disadvantage is that the loss of the bottom column is relatively large.
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