What are Underground Drills Called?
Underground drilling is a crucial process in various industries such as mining, oil and gas exploration, construction, and geotechnical engineering. It involves creating holes or shafts in the ground to extract resources, conduct surveys, or install infrastructure. The equipment used for this purpose is known as underground drills or drilling machines. In this article, we will explore the different types of underground drills, their working principles, and their applications. Let''s dive in!
What is Underground Drilling?
Underground drilling refers to the process of drilling holes or shafts below the Earth''s surface. It is performed to explore and extract valuable resources like minerals, ores, oil, gas, and water. Underground drilling is also necessary for geotechnical investigations, tunneling, and underground construction projects.
Types of Underground Drills
There are various types of underground drills available, each designed for specific purposes. Let''s take a closer look at some commonly used drills:
1. Jumbo Drills: Jumbo drills, also known as tunneling jumbos or roof bolters, are large drilling machines primarily used in mining and tunneling operations. They are capable of drilling holes with diameters ranging from 1 to 6 meters. Jumbo drills can also be equipped with roof bolters to reinforce tunnel roofs with bolts and meshes.
2. Longhole Drills: Longhole drills are used for drilling long, straight holes into the rock, typically for mining purposes. These drills are mounted on a carriage or a stope and are capable of drilling holes up to 200 meters deep. Longhole drills are commonly used in underground mining for extracting minerals like gold, silver, copper, and zinc.
3. Raiseboring Machines: Raiseboring machines are specialized drills used for drilling vertical or inclined shafts, also known as raises. These drills are typically used in underground mining operations to create ventilation shafts, ore passes, and for constructing underground infrastructure. Raiseboring machines can drill shafts of various diameters and depths depending on the requirements.
4. Directional Drills: Directional drills, also called horizontal drills or slant drills, are used for drilling horizontal or angled holes. They are commonly used in directional drilling applications for installing underground pipelines, cables, and utility lines. Directional drills minimize surface disruptions and are widely used in urban areas where conventional trenching methods are not feasible.
5. Jackleg Drills: Jackleg drills, also known as rock drills or leg drills, are portable drilling machines used for small-scale mining, tunneling, and construction activities. These drills are operated manually and are commonly used for drilling blast holes or anchor holes. Jackleg drills are lightweight, easy to handle, and can be used in narrow spaces.
Working Principles of Underground Drills
Underground drills operate based on different principles, depending on their design and purpose. Let''s explore a few common working principles:
1. Rotary Drilling: Rotary drilling is the most common drilling technique used in underground drilling. It involves rotating a drill bit to create a hole by cutting or crushing the rock formation. The drill bit is attached to the end of a drill string, which is powered by a rotating drill rig. This method is widely used in mining, oil and gas exploration, and geotechnical engineering.
2. Percussion Drilling: Percussion drilling, also known as hammer drilling, uses a hammering action combined with rotation to penetrate the rock formation. The drill bit impacts the rock surface with high frequency and force, breaking it into smaller pieces. This method is often used in small-scale mining and construction applications where rotary drilling may not be suitable.
3. Raiseboring: Raiseboring is a specialized drilling technique used for creating vertical or inclined shafts. It involves rotating a cutting head attached to a pilot drill string, which gradually enlarges the hole. The cuttings are removed from the hole using a slurry or other drilling fluids. Raiseboring is commonly used in mining, civil engineering, and underground construction projects.
Applications of Underground Drills
Underground drills find various applications across different industries. Some notable applications include:
1. Mining: Underground drilling is essential for mining operations to extract minerals, ores, and other valuable resources from the Earth''s crust. Drills are used for exploration, blasting, tunneling, and mine development activities.
2. Oil and Gas Exploration: Drilling rigs are used in the oil and gas industry to explore and extract hydrocarbon reserves beneath the Earth''s surface. Drills play a crucial role in creating wells and extracting oil and gas for commercial purposes.
3. Geotechnical Engineering: Geotechnical investigations require drilling to obtain soil and rock samples, assess ground conditions, and design foundations for structures. Underground drills are used to conduct geotechnical surveys and investigations.
4. Construction and Tunneling: Underground drilling is vital for constructing tunnels, underground utilities, bridges, and other infrastructure projects. Drills are used to create shafts, anchor holes, and install support systems.
5. Scientific Research: Underground drilling is employed in scientific research projects to study geological formations, earthquake monitoring, and studying the Earth''s crust. It helps scientists gain a deeper understanding of the Earth''s composition and history.
Conclusion
Underground drills play a significant role in various industries requiring the exploration, extraction, and construction beneath the Earth''s surface. They enable us to access valuable resources, conduct surveys, and implement infrastructure projects. By understanding the different types of underground drills, their working principles, and applications, we gain insight into the vital role they play in shaping our world.