1. Structural Characteristics of DTH Casing Bit

As an important part of DTH drilling tools, the structural design of the DTH casing bit is centered on the needs of efficient drilling and hole wall protection, and mainly presents the following characteristics:

1. Dual-pipe Structure Design: This is the most prominent structural feature of the DTH casing bit, which consists of an outer pipe (casing pipe) and an inner pipe (drill pipe). The outer pipe is responsible for following up synchronously during the drilling process, providing support and protection for the hole wall to prevent hole wall collapse; the inner pipe is connected to the main body of the drill bit and undertakes the core task of rock breaking. The dual pipes work together to realize the synchronous progress of drilling and hole wall protection.

2. Special Bit Tooth Layout: The alloy teeth on the bit head adopt an optimized arrangement, such as spiral or staggered layout. This layout can effectively improve the rock breaking efficiency, reduce the drilling resistance, and at the same time ensure that the broken rock cuttings can be smoothly discharged through the gaps between the teeth, avoiding the impact of cuttings accumulation on the drilling speed, and is suitable for rock formations with different hardness.

3. Efficient Cuttings Discharge Channel: Special cuttings discharge channels are designed between the inner and outer pipes and on the bit head. The cross-sectional size of the channel is accurately calculated, which not only ensures the smooth discharge of cuttings and timely brings the broken rock cuttings out of the hole, but also does not weaken the overall structural strength of the drill bit due to the excessively large channel, maintaining the stability of the drilling process.

4. High-strength Connection Structure: The connection parts between the inner pipe and the bit main body, and between the outer pipe and the drilling tool system adopt high-strength thread or flange connection methods and undergo strengthening treatment. This structure can withstand the huge torque and impact force generated during the drilling process, prevent the connection parts from loosening or breaking, and ensure the long-term stable operation of the drilling tool.

2. Main Functions of DTH Casing Bit

1. Synchronous Hole Wall Protection and Drilling: When traditional drilling tools drill in loose, broken or easy-to-collapse formations, they need to drill first and then run casing pipes for hole wall protection, which is a cumbersome process and prone to hole wall collapse. However, relying on its dual-pipe structure, the DTH casing bit enables the outer pipe to follow up synchronously and support the hole wall while drilling, realizing the synchronous progress of hole wall protection and drilling, greatly shortening the construction period and reducing the risk of hole wall collapse.

2. Efficient Rock Breaking: The special tooth layout and high-strength alloy teeth enable the DTH casing bit to cut into the rock quickly and break the rock into fine cuttings. At the same time, the optimized breaking angle design reduces the breaking resistance per unit area and improves the drilling efficiency. Even in rock formations with high hardness, it can maintain a stable drilling speed.

3. Smooth Cuttings Discharge: The special cuttings discharge channel ensures that the rock cuttings can be discharged out of the hole in a timely and smooth manner. It avoids problems such as increased drilling resistance and accelerated bit wear caused by the accumulation of cuttings in the hole, maintains the continuity of the drilling process, further improves the construction efficiency, and reduces the incidence of drilling tool failures.

4. Guaranteeing Drilling Quality: Under the effect of synchronous hole wall protection, the hole wall is effectively supported, and problems such as hole diameter expansion, diameter reduction or irregular hole wall are less likely to occur, ensuring the diameter accuracy and verticality of the drill hole. At the same time, it reduces the rework caused by hole wall collapse, improves the overall project quality, and lays a solid foundation for the smooth development of subsequent projects (such as anchor installation, grouting, etc.).

3. Application Scenarios of DTH Casing Bit

1. Geological Disaster Control Projects: In the control of geological disasters such as landslides and collapses, it is often necessary to drill holes in loose and broken slope formations for the installation of support structures such as anti-slide piles and anchors. The DTH casing bit can effectively deal with such easy-to-collapse formations, complete drilling and hole wall protection synchronously, ensure the smooth construction of support structure drill holes, and guarantee the safety and stability of geological disaster control projects.

2. Mine Mining Projects: In the process of mine mining, whether it is an open-pit mine or an underground mine, a large number of drilling operations are required, such as blast holes and exploration holes. When encountering rock formations with developed joints and broken structures, the DTH casing bit can give full play to its advantages, complete the drilling quickly and efficiently, and ensure the drilling quality, providing reliable guarantee for mine blasting, resource exploration and other operations, and improving the mine mining efficiency.

3. Water Conservancy and Hydropower Projects: Links such as dam foundation treatment, anti-seepage wall construction and tunnel excavation in water conservancy and hydropower projects often involve complex formation conditions, such as sandy gravel layers and weathered rock layers. The DTH casing bit can drill efficiently in these formations, provide qualified drill holes for dam anti-seepage, tunnel support and other projects, and ensure the structural safety and normal operation of water conservancy and hydropower projects.

4. Municipal Engineering: In municipal projects such as urban subways, underground pipe corridors and foundation treatment of high-rise buildings, the construction environment is complex, and high requirements are put forward for drilling quality and construction efficiency. When the formation is loose filled soil, sand layer or broken rock layer, the DTH casing bit can effectively solve the drilling problems, reduce the impact of construction on the surrounding environment, and ensure the smooth progress of municipal projects. For example, in the foundation reinforcement drilling operation of subway stations, it can quickly complete high-quality drilling.

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