What is a primary technique in the Direct Rotary Drilling method?

In the Direct Rotary Drilling method, the primary technique involves the continuous rotation of the drill bit. This method allows for efficient penetration into the ground by maintaining a constant rotational speed while the drill bit advances through different soil and rock formations. The design of the drill bit typically includes a series of cutting edges that can effectively break up and remove material from the borehole as it rotates.

The continuous action of the rotating drill bit generates sufficient force to penetrate the earth, allowing for deeper drilling without the need for other disruptive methods. This approach is particularly effective in various geological conditions, making it a popular choice for drilling in groundwater exploration and development. By keeping the bit in constant motion, the operator can optimize drilling speed and efficiency, leading to a well-constructed borehole that is essential for effective groundwater management.

Other methods mentioned, such as using a heavy tool lifted and dropped or a chisel-shaped bit, are not primary techniques associated with Direct Rotary Drilling. They may relate to other drilling techniques but do not reflect the process utilized in this method.