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The cutting work mainly includes: digging into the trench roadway, cutting the roadway (refer to 6 in the figure), cutting the patio, forming a trench, and cutting the vertical groove.
(1) Forming a trench into the trench roadway, the vertical upward fan-shaped medium-deep hole is drilled in the roadway, and the trench is formed in the same sub-stage blasting.
(2) Digging the cutting trough
The purpose of cutting the vertical groove is to create a free surface for the mine, and provide compensation space. There are three types of cutting vertical groove, namely: "eight" shaped vertical groove, "J" shaped groove, "well "The word vertical groove.
1) "eight" shaped vertical trough arrangement (this method is used for inclined ore bodies above medium thickness)
1 This type of vertical groove is suitable for inclined ore bodies with a thickness above and below.
2 The method of forming the vertical trough is to: at the proposed grooving, from the gully roadway, according to the predetermined grooving contour, two opposite inclined patios are drilled, and the two wells form an inverted "eight" shape, one for rock drilling The patio and the other serve as a free surface and compensation space for the blasting of the cutting trough. In the rock drilling patio, the 01-38 or YG-40 rock drill is equipped with a vertical slotted bracket, and parallel blast holes parallel to the free surface patio are drilled, and the crater is formed after the blasting.
[Attention to the problem] When constructing, pay attention to the rock drilling patio that is dug along the lower part of the ore body, and do not collapse with the upper section.
3 "eight" type trough method advantages and disadvantages
Advantages: small amount of engineering, high utilization of blastholes; small amount of waste stone cutting.
Disadvantages: The preparation work for rock drilling is large (the rock bench is to be erected); the auxiliary workload is large (the rock drill moves frequently) and the work efficiency is low. So it is not used much. (Used by Zhongtiaoshan Nonferrous Metals Co., Ltd.)
2) "J" type groove drawing method
1 Pulling method——The “Ding†type vertical trough is above the gully roadway or rock drilling roadway, the vertical gully roadway or the rock drilling roadway is used to dig the cutting roadway, and then the vertical cutting well is boring from the cutting roadway, and the cutting roadway is cut. And the cutting wells form an inverted "D" shape. A vertical upward fan-shaped medium-depth hole parallel to the cutting well is drilled in the cutting lane to cut the well as a free surface and a compensation space, and the blast holes are formed to form a cutting vertical groove.
2 main advantages and disadvantages
Advantages: rock drilling, construction, excavation, etc. are convenient; the equipment can be easily disassembled, disassembled and operated; it can be reduced, the labor of auxiliary work is small and the material consumption is reduced. Therefore, the use of such a groove method is common.
Disadvantages: There is a partial waste cutting amount.
3) "well" type drawing groove method
1 This kind of groove method is actually a combination of “D†shaped grooves, which consists of a cutting alley and a cutting patio, forming a “well†shape at a predetermined cutting groove.
2 Applicable conditions: suitable for large cutting area or large cutting volume.
(3) The relationship between the formation of the cutting trough and the falling ore
There are two cases: 1 The cutting vertical groove is formed first, and then the mining is carried out. The advantage is that the quality of the vertical groove formation can be directly observed, and the defects can be compensated in time. However, this method has high requirements for the stability of the ore rock, and can not exert the extrusion blasting conditions well, so the practice is not much used. .
2 Forming the cutting groove and the falling section of the mine. The pros and cons are the opposite of the first one, and actually use more. When the local pressure is large and the ore is not stable, it is better to use this formation.
(4) [Caution]: 1 The cutting trough should be placed in the area where the ore body is enlarged or removed, or where the stability is good. 2 should pay attention to the need for exploration and integration. 3 There should be a certain safety distance between the cutting well and the boundary of the collapsed area.
Criss-cross grooves design enhance water evacuation, effectively prevent tire lateral slip on wet road.
Central rib combined with horizontal grooves provides nice stability, excellent acceleration and brake performance at high speed.
Low levels of noise and vibration for maximum comfort.
Low rolling resistance reduces fuel consumption.
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