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E-mail : sales1@tianyuedrill.com
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ABOUT USShandong Yanggu Tianyue Drill Tools Co, Ltd. is a professional manufacturer of rock drilling tools in China. Our company has advanced heat treatment, inspection and testing, measurement , and experimental equipment
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PRODUCT CENTERThe products of our company include: T38, T45, T51, D32, H25, H28, H32, H35, as well as MF-ROD, extension rod, shank adapter, drill bit and supporting products specially used by hydraulic rock drilling machine.
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NEWSOur company integrates scientific research, design, production, and operation in one, owning 5 related patents (1 invention patent), 4 trademarks, the import and export right of self-operation, and passing ISO9001 certificati
Requirements for Drilling Holes in Rock Drilling and Blasting Operations
Release time:
2022-12-22
Another requirement on the drilled rock hole is to remain stable until it has been used for charging or other purposes. Under certain conditions, e.g. when drilling in unconsolidated material or soft rock (the area has a tendency to break out and plug the rock hole),
Boreholes are generally described by four characteristics: straightness, depth, straightness and stability.
1. Hole diameter
The diameter of the drilled hole depends on what the hole is used for. In blast hole drilling operations, there are many factors that affect hole selection. For example: the required size of rock particles after breaking the rock; the type of blasting chosen; the rock to be blasted
The "quality" requirements of the particles (the ratio of particle surface smoothness and fragmentation); the degree of surface vibration allowed in blasting operations, etc. In larger quarries or large open-pit mines, the use of large-hole blasting operations often reduces
Drilling and blasting costs per ton of rock. In downhole rock drilling operations, mining equipment is limited by the underground space. In the drilling operation of water well holes, the size of the rock hole depends on the diameter of the pipe or the diameter of the supporting equipment required by the pump.
beg. In terms of rock formation support holes, the diameter of different bolts is a decisive factor.
2. The depth of the hole
The depth of the hole is affected by rock drilling equipment, and only short drilling tools can be selected in a limited space. Short drilling tools in the form of threaded connections are very necessary for rock drilling in limited spaces. In the rock drilling operation of blasting rock holes (horizontal
or vertical hole), the depth of the drilled hole is slightly deeper than the theoretical depth or terrace height. Under some rock drilling conditions, the depth of the drill hole is required to be deep (50-70 meters or deeper), and the down-the-hole rock drilling method is generally used instead of the top hammer
Percussive rock drilling and down-the-hole drilling are more efficient in terms of energy transfer and powder discharge under deep hole conditions.
3. Straightness of the hole
The straightness of the hole is a factor that varies greatly with the rock type and natural conditions, the selected mining method and the selected mining equipment. In horizontal and inclined rock drilling, the weight of the drilling tool also affects the deflection of the hole. Drill
When drilling a deep blast hole, the drilled rock hole must be kept as straight as possible so that the charge can be charged accurately to obtain the desired blasting effect.
In certain types of rock drilling operations, deeper rock holes are often drilled, and the straightness requirements of the rock holes are extremely high, such as pipe holes or cable holes. Even the well bores are very strict so that the water pipes and pumps can be installed smoothly.
Using different types of guide equipment, such as: guide bit, guide pipe and guide rod, will improve the straightness of the hole. In addition to the offset of the rock hole itself, the direction of the drilled hole is also affected by the adjustment of the advancing beam and the opening
factors such as accuracy. So considerable precision is required in this respect. Studies have shown that more than 50% of rock hole excursions are due to unreasonable propulsion beam adjustment and poor opening.
4. Hole stability
Another requirement on the drilled rock hole is to remain stable until it has been used for charging or other purposes. Under certain conditions, e.g. when drilling in unconsolidated material or soft rock (the area has a tendency to break out and plug the rock hole),
It is very important to use drill pipe or rubber hose to run into the drilled rock hole.
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Add : No. 229, Xihu Road, Xihu Town, Yanggu County, Shandong Province
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