What kind of drill bit should be used for rotary drilling rigs in different formations? It is completely clear! _ Soil layer

Original title What kind of drill bit should be used for rotary drilling rigs in different formations It is completely clear! 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 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 。 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 argillaceous conglomerate etc Hard rock with high degree of weathering such as completely and strongly weathered granite is often used with mining drill bit barrel drill and spiral drill bit when drilling hard rock 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 the barrel drill can be used to deal with it Rock-socketed auger bit Expand the full text It is applicable to the crushing of boulders boulders and hard rock strata in holes 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 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 Single-bottom bailing bucket of soil layer The function of the drill bit is similar to that of a double-bottom bailing drilling bucket 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 Tapered Rock Bit especially when it is used with friction rod it may slip and fail to drill which seriously affects the drilling efficiency 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 Double-bottom single-door drilling tool Generally drilling tools with diameter ≤ 12m 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 ≤ 12m 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 It is suitable for drilling in soil layer with sharp tooth 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 Piling World We are committed to protecting the copyright of the author the source of the content has been marked 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