Choosing drill bits based on different geological conditions

by:Ronix Tools     2021-07-14
Rotary drilling rig is currently the most commonly used equipment for pile workers. Due to the different geological conditions in various places, how to choose the right drill bit has become a key issue in the piling process. Today, we will discuss how to choose a rotary drill bit after understanding the geological characteristics of the site. Soil double bottom fishing bucket: suitable for silt, fine sand, silt, silty clay, clay, some soil-like soft rocks, such as whole, strongly weathered and moderately weathered mudstone, argillaceous sandstone; it is used in the industry The widest range of drill bits. Rock-socketed double bottom fishing bucket: suitable for eggs, gravel layers, moderately weathered soft soil-like rocks, such as moderately weathered argillaceous sandstone, argillaceous conglomerate, etc. When drilling hard rocks with a high degree of weathering, such as fully weathered or strongly weathered granite, it usually needs to be used in conjunction with barrel drills and augers. Cylinder drill: Suitable for circumferential cutting of medium weathered sandstone with obvious layering (high core rate) and hard rock. In the soil layer with high degree of compaction or part of the soft rock layer, you can try to use a barrel drill to deal with the slip caused by the choice of friction electric drill pipe. Rock-socketed auger: It is suitable for breaking hard rock formations, such as pepper rock and quasi-solid solution. For some cement slurry formations, if it is impossible to drill with a double bottom bucket of the soil layer, an auger can be used to drill pebble soil with medium compaction. Double barrel drill: suitable for drilling eggs and flow stones with a particle size of 200~500mm. The double barrel drill adopts a new drilling concept 'squeeze'. In other words, the size of the broken pebble in the bucket after being squeezed out of the hole. In the design, the diameter of the outer cylinder is designed according to the diameter of the pile, and the diameter of the inner cylinder is designed according to the average particle size of the pebbles, and the inner cylinder is higher than the outer cylinder. The drilling tool has been widely used in China. Drilling efficiency and tooth loss are significantly better than other drilling tools. Soil single-bottom fishing bucket: The drill bit is similar to the double-bottom fishing bucket because it has a side entrance and the bucket door can be closed without the need for a reverse drill bit. Therefore, it is more efficient when drilling soil. The disadvantage lies in its light weight. For some hard soil layers, especially when used with friction rods, slipping may occur, which seriously affects the efficiency of drilling. Earth auger: only suitable for small pile diameter and cohesive clay layer. The advantage is that the height of the drill bit can reach 4m, which is as large as a single foot, and it can effectively avoid the problem of difficult slag removal with other electric drill bits in this type of project. It is recommended to be used within the scope of application. Double bottom single door drill: Usually, the diameter is less than 1.2m. Compared with double-bottom and double-door drilling tools, it has a larger single-side inlet, which is more conducive to the drilling of certain formations, such as pebbles with a diameter of less than 200mm. However, because the single-leaf door has an asymmetric structure, higher requirements are put forward for the design or production, otherwise the phenomenon of partial holes is prone to occur. It is recommended that this bit be used for drilling small pebble formations with a diameter less than or equal to 1.2m. Classification and use of drill teeth: Drilling gear is a part of the rotary drilling system and is in direct contact with the work object. A good drill tooth should have the characteristics of no cracks, constant fracture, wear resistance, and disassembly. There are four common types of drill teeth (above): 1. Bucket teeth: suitable for soil drilling, with sharp teeth and fast cutting speed, and cannot be used in hard formations such as pebbles and rocks. 2. Baume teeth: stronger than bucket teeth, not easy to break, suitable for large-diameter buckets, suitable for small and medium pebbles and soft rocks. 3. Sawtooth: To drill the teeth on the rock, and the wear-resistant alloy tip can provide more pressure to the rock, which is suitable for rock crushing. 4. Gear: It is suitable for drilling super hard rock and broken rock. The rotation of the gear reduces the vibration of the rock and prolongs the service life of the multi-blade alloy knife.
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