(1) Features - A V-shaped groove is formed in the longitudinal direction between the funnels. In fact, the two cutting operations of the bottoming and the funnel group are combined, and the upper and lower fan-shaped holes are simultaneously drilled.
(2) Applicable conditions - applicable to the conditions of stable rock.
(3) Advantages and disadvantages -
<Advantages>: The bottom structure is simplified, the cutting work efficiency is improved, and the blockage is small.
<Disadvantages>: The cutting of the bottom column is more, which affects the stability.
(4) Dig structure size
The size of the ore discharge port of the 1 ditch is generally 2 to 3.5 meters. This reduces the clogging factor.
2 The ore discharge port is divided into two types of distribution: single side and double side.
(5) trench construction method
1) Fighting the river from the electric ramp, then hit the neck upwards, and continue to dig to form a cutting well, and the neck and the gully pass through.
2) Fan-shaped medium-deep holes or shallow holes in the gully roadway, with the cutting well as the free surface, and the free surface of the opening trench (small vertical groove) after blasting
3) Finally, the cutting small vertical trough blasts the blasting free surface row by row, pulling the entire trench apart.
4) [Note] In the actual production, it is not the case that the trench is pulled apart once, but gradually with the mining of the upper mine. For example, the small and medium method uses this bottom structure, which is the same number of holes as the mining room blasting. Falling together to form a mine.
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