Original Title: Drill Bits of Rotary Drilling Rig (How to Select Drill Bits for Different Bottom Layers and Classification of Drill Teeth) Rotary drilling rig is the most common equipment in the current pile construction. Because the geology of each place is different, how to select the appropriate drill bit in the process of piling has become a key issue. Today, we will talk about how to select the drill bit of rotary drilling rig after understanding the geological characteristics of the site. 1 Double-bottom bailing drilling bucket for soil layer: Suitable for silt, fine sand, silt, silty clay, clay and some soil-like soft rock, such as completely, strongly and moderately weathered mudstone, argillaceous sandstone, etc.; it is the most widely used bit in the industry 。 Expand the full text 2 Rock-socketed double-bottom bailing bucket: It is suitable for pebble and gravel layer, moderately weathered soil-like soft rock, such as moderately weathered argillaceous sandstone,rock drilling tools, argillaceous conglomerate, etc. Hard rock with high degree of weathering, such as completely and strongly weathered granite, is often used with barrel drill and spiral drill bit when drilling hard rock. 3 Barrel drill: Suitable for moderately weathered sandstone with obvious stratification (high probability of coring) and ring cutting of hard rock formation. In the soil layer with high compactness or some soft rock layers, when the friction drill pipe is selected to cause slippage,dhd drill bit, the barrel drill can be used to deal with it. 4 Rock-socketed auger bit: It is suitable for the crushing of boulders, boulders and hard rock strata in the hole. For some clay strata and moderately dense pebble soil, when the double-bottom bailing bucket of the selected soil layer cannot be used for drilling, the auger bit can be used for drilling. 5 Double Barrel Drill: It is suitable for drilling in pebble and boulder layers with grain size of 200 ~ 500 mm. The double barrel drill adopts a new drilling idea of "squeezing". That is to say, the broken stones and pebbles of different sizes are taken out of the hole after being compacted in the cylinder. In the design, the diameter of the outer cylinder is designed according to the diameter of the formed pile, and the inner cylinder diameter is designed according to the average particle size of pebbles, and the inner cylinder is higher than the outer cylinder. This drilling tool has been widely used in China, and is obviously superior to other drilling tools in terms of drilling efficiency and drill tooth loss. 4 Single-bottom bailing bucket of soil layer: The function of the drill bit is similar to that of a double-bottom bailing drilling bucket, down the hole bit ,dth drill bits, and the drill bit has the advantages that the drill bit has a side soil inlet, does not need to drill back to close the bucket door, and has higher drilling efficiency for the soil layer. The disadvantage is that its weight is light, for some hard soil layers, especially when it is used with friction rod, it may slip and fail to drill, which seriously affects the drilling efficiency. 7 Soil Auger: It is only applicable to the clay layer with small pile diameter and large cohesion. The invention has the advantages that the maximum height of the drill bit can reach 4m, the single footage is large, and the problem that other drill bits are difficult to discharge slag in such projects can be effectively avoided. It is recommended to be used within the applicable scope. 8 Double-bottom single-door drilling tool: Generally, drilling tools with diameter ≤ 1.2m. Compared with the double-bottom and double-door drilling tool, it has a larger single-side soil inlet, which is more conducive to the drilling of some strata, such as the pebble stratum with a particle size of less than 200mm. However, due to the asymmetric structure of the single door, there are higher requirements for design or production, otherwise it is easy to appear the phenomenon of partial hole. This bit is recommended for pebble formation drilling with small pile diameter ≤ 1.2m Classification and use of drill teeth: Drill teeth are the components of the rotary drilling rig system that directly contact with the working object. Whether its selection, layout angle, layout spacing and other parameters are correct or not plays a decisive role in the construction efficiency. A good drill tooth should have the characteristics of no crack, no break, wear resistance, easy disassembly and assembly, etc. At present, there are four common types of drill teeth (above): 1. Bucket teeth : Suitable for drilling in soil layers, with sharp cutting edge and fast cutting speed. It cannot be used in hard strata such as pebbles and rock strata. 2. Bao'e tooth Compared with the bucket teeth, it is stronger and not easy to break. It is used for large-diameter soil buckets and is suitable for small and medium-sized pebbles and soft rocks. 3. Pick Rock drilling teeth and wear-resistant alloy points provide greater pressure on the rock, which is suitable for rock crushing. 4. Gear teeth It is suitable for drilling in super hard rock, crushing rock by rolling, reducing rock vibration by cone rotation, and prolonging the service life of multi-wear-resistant alloy cutter. END Source: Rotary drilling rig escort service We are committed to protecting the copyright of the author, the source of the content has been marked,mining dth bit, only for the dissemination and sharing of knowledge. No other commercial profit, if there is infringement, please contact us to delete. Push Return to Sohu to see more Responsible Editor:. wt-dthtools.com
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