What is DTH drilling?

Jun. 24, 2024

What is DTH drilling?

In the fields of geotechnical engineering, mining, and geological exploration, DTH drilling technology has become an indispensable and vital construction method with its efficient and accurate drilling performance. This article will give you a detailed concept, principle, application field, and advantages of DTH drilling technology to help you fully understand it.

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DTH drilling uses compressed air as the power and well-washing medium. It uses the energy of compressed air to convert wind energy into mechanical energy through a DTH hammer to achieve impact on the bottom of the hole. The rock at the bottom of the hole is fractured through impact rotation, with the primary method being impact, resulting in the rock breaking in volume. In air drilling, the air displacement is large, the bottom of the hole is clean, and repeated crushing is less.

Application fields of DTH drilling

DTH drilling has a wide range of applications, mainly including the following aspects:

Water well drilling: DTH drilling can be used for drilling groundwater wells, water supply systems, and water resource exploration.
Underground engineering: in underground engineering projects such as foundation engineering, hydropower stations, and tunnel construction, DTH drilling is used for drilling operations.
Geotechnical engineering: mountain-opening DTH drilling vehicles are used for geotechnical exploration, geotechnical sampling, and monitoring, which helps to understand the conditions of underground soil and rocks.
Mining work: DTH drilling technology is used in mining, exploration, and blasting work and can be used to drill blasting holes, rockfall holes, etc.

Working principle of DTH drilling

Energy transfer: the drill rig transfers energy to the DTH hammer through compressed air.
Impact and rotation: when the DTH hammer is powered by compressed air, it generates a high-frequency impact force that strikes the drill bit and transfers energy to the rock. Simultaneously, the drill rod rotates, causing the drill bit to turn within the rock.

Advantages of DTH drilling

DTH drilling has the following advantages over other drilling methods:

High efficiency: high drilling efficiency, especially in solid rock formations, the drilling speed can reach 2-5 times that of conventional drilling. Since the hammer is located directly above the drill bit, energy loss is minimal, ensuring that the drilling rate remains relatively consistent even as depth increases.
Low noise: low noise and vibration, suitable for use in cities and densely populated areas. Compared to other drilling methods, DTH drilling produces less noise and vibration, resulting in reduced environmental and social impact.
Low operating cost: the compressed air eliminates the need to purchase, transport, or treat drilling fluid and reduces the amount of drilling fluid and additives required. Additionally, since the impact force is provided by the impactor, the drill bit experiences less wear.
Wide applicability: DTH drilling technology applies to various geological conditions, such as sand, clay, and rock, and has a wide range of applicability.

Conclusion

As an efficient and safe construction method, DTH drilling plays a crucial role in engineering fields such as geological exploration, mining, and tunnel construction. Understanding and mastering the principles and application areas of DTH drilling technology is of great significance to improving engineering quality and efficiency. If you need to use DTH drilling technology in your construction project, you might as well choose a professional construction team and advanced equipment to ensure the smooth progress of the project.

Sandvik Launches New Intelligent Top Hammer Longhole ...

Oct 31, - one year ago

Sandvik Mining and Rock Solutions has introduced its newest i-series top hammer longhole drill rig, Sandvik DL422i.

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Following the launch of the Sandvik DL422iE battery electric drill in , Sandvik has now introduced its diesel counterpart, designed for underground mass mining in 4 x 4 meter or larger production drifts.

Sandvik DL422i offers the same productivity, reliability and high utilization as its BEV counterpart for operations with challenging site conditions that are not optimized for a battery electric fleet.

&#;The new DL422i expands our i-series longhole production drill offering with a traditional diesel engine layout and begins to take over the workload of its renowned predecessor, Sandvik DL421.&#; says Sami Anttila, Product Line Manager, Longhole Production Drilling.

Sandvik DL422i prioritizes automated operations, fleet connectivity, availability of data and improved hole accuracy, supported by Sandvik&#;s technical support and operator training for an improved user experience. Automated operations over shift changes enable up to 20% increased productivity and up to 10% more drilled meters in a shift.

Enabling digitalization
Sandvik DL422i is a highly intelligent and automated drill within Sandvik&#;s i-series underground drilling offering, with options for both automation and teleremote operation.

It is compatible with Sandvik&#;s Platinum level automation package, which includes one-hole and fan automation, automatic boom repositioning to the next hole, automatic stinger control, drill plan and as-drilled data management (WLAN), plus connectivity to My Sandvik remote monitoring and Sandvik DrillConnect mobile application. Later in , Sandvik DL422i will also be compatible with Sandvik&#;s teleremote drilling and tramming offering, expanding remote control from single to multiple units from a single console.

In operations with low/zero mine network connectivity, Sandvik DrillConnect mobile application can be utilized for easy and smooth drill plan transfer, comprehensive data collection and intelligent troubleshooting.

Maximum productivity and safety
Sandvik DL422i is designed to provide maximum productivity and safety and has been developed with the future of mining in mind. The control system platform allows for new technology implementation during the product lifetime, while teleremote and automated drilling allows for unmanned operation through shift changes and breaks, increasing fleet utilization.

The powerful HFST rock drill offers improved energy transfer and stability with high penetration rates and drilling capacity.

Sandvik&#;s new i-class cabin provides a safer and more comfortable working environment, with improved visibility in operation, reduced sound pressure level during drilling, adjustable drilling control panel and multi-purpose seat with back and head support. Swing out frames provide easy, safe and fast access to the main components from ground level.

Source: Sandvik

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