Rotary drilling rigs offer a variety of drill bits, with different models, types, and sizes to suit various geological and construction environments. Below is a list of the performance and characteristics of common drill bits.#drill parts#
I. Hydraulic Grab Bucket: With the increasing prevalence of continuous wall and anti-seepage wall construction projects, rotary drilling rigs can be easily modified for operation. The hydraulic grab bucket is hydraulically driven, requiring only one hydraulic cylinder, two inlet/outlet oil pipes, and one control valve.
II. Rotary Drilling Buckets: Based on the number of teeth installed, they can be divided into cutting tooth buckets and bucket tooth buckets; based on the number of bottom plates, they can be divided into double-bottom buckets and single-bottom buckets; based on the number of openings, they can be divided into double-door buckets and single-door buckets; based on the taper of the bucket, they can be divided into conical bucket buckets and straight bucket buckets; based on the shape of the bottom plate, they can be divided into pot-bottom buckets and flat-bottom buckets. Combining these structural forms, along with variations in the presence or absence of vents and opening mechanisms, dozens of types of rotary drilling buckets can be created. Generally, double-bottom buckets are suitable for a wider range of geological formations, while single-bottom buckets are only suitable for highly cohesive soils. Double-door buckets are suitable for a wider range of geological formations, while single-door buckets are only used for large-diameter pebbles and hard clay.#drill parts#
III. Spiral Drill Bits: Conical drill bits with double ends and double screws are suitable for hard bedrock. Double-end single screw drill bits are suitable for weathered bedrock, pebbles, and permafrost. These drill bits, equipped with various cutting teeth, can be further derived into many types of drill bits through variations in tooth shape, pitch, and helix angle. Straight auger drill bits are divided into two types: bucket-tooth straight auger and cutter-tooth straight auger (double-ended, double-ended), suitable for sandy soil and poorly cemented small-diameter gravel layers; double-ended single auger, suitable for sandy soil and soil layers; and single-ended single auger, suitable for poorly cemented large-diameter pebbles, cohesive soil, and hard clay. Double-ended, triple-ended, and quadruple-ended augers are also available, suitable for hard bedrock or gravel.#drill parts#
IV. Enlarged Base Drill Bits: To increase the bearing capacity of a single pile without increasing the pile diameter or depth, design departments often use enlarged base piles. Enlarged base drilling on rotary drilling rigs requires no modifications; only an enlarged base drill bit needs to be selected. Mechanical enlarged base drill bits are commonly used. These bits are relatively simple to use and maintain. They are available in top-opening and bottom-opening types, with a four-link opening mechanism, and are used in soil layers, strong winds, moderately weathered strata, and even hard bedrock. Since rotary drilling is non-circulating, after enlarged base drilling, the slag can be removed using a slag removal bucket.
V. Percussion Drill Bits and Impact Drill Bits: Percussion drill bits and percussion drill bits are particularly effective when drilling large-diameter pebbles, large boulders, and hard bedrock in conjunction with rotary drilling. These bits are used by suspending the drill bit via the rotary drilling rig's auxiliary hook. For optimal results, the auxiliary hook must have a free rope release function to provide sufficient impact.
VI. Core Sampling Bits: Currently, there are two common types: toothed core drill bits, suitable for medium-hard bedrock and gravel, and roller cone core drill bits, suitable for hard bedrock and large boulders. Within these two main types, core drill bits are further divided into those with and without a core sampling device, depending on the difficulty of core sampling. Because roller cone core drill bits are primarily used for hard rock drilling and for drilling large annular areas, rotary drilling rigs, if equipped with the necessary resources, can also incorporate reverse circulation drilling into the drill bit to improve drilling efficiency.#drill parts#
