Original title: The strongest rotary drilling arrangement in history, if you don't know, the construction will be in vain! This article has sorted out the characteristics and scope of application of all rotary drilling tools. You can select and use these drilling tools according to their characteristics during construction. It is strongly recommended for collection! Category I: rotary drilling bucket A: Rock-socketed sand hopper Features: The main body type is the same as the sand layer drilling bucket, but the cutting tools are different. The cutting teeth can be all adopted, and the combined teeth can also be adopted. Applicable strata: soft and hard strata and complex strata such as sandy soil layer with high water content, muddy clay, dense clay, sandy gravel layer, pebble gravel layer, shell layer, iron plate sand, high strength frozen soil, strongly ~ moderately weathered rock stratum, etc. B: bailing bucket Expand the full text Double bottom bailing bit Features: There are two bottom plates under the barrel, the upper and lower bottom plates are connected by the central suspension shaft, and they can rotate a certain angle relatively to realize the opening and closing of the soil inlet at the bottom of the bucket. For the stratum which is easy to suck and drill, the straight-through gas bit can be specially designed. Applicable strata: loose soil, sandy soil layer with high water content, muddy loam, gravel layer, loose frozen soil and other strata with loose structure and low extraction strength. φ2000 sand hopper (upper form) φ2000 Bao'e tooth sand hopper (middle and lower shape) Double-bottom sand hopper for hole cleaning Application of hole cleaning sand hopper: it is used to remove the sediment in the hole. C: Soil drilling bucket Rotary soil layer drilling bucket Features: single floor, supporting the use of wear-resistant alloy steel shovel type bucket teeth, to achieve rapid drilling. Applicable strata: silt, muddy clay, clay, plastic frozen soil, massive sandy soil, weathered soft bedrock and other strata with low strength and difficult to loosen structure after being disturbed. Type II: rotary drilling short auger bit A: Rock-socketed screw Monocone monospiral rock helix Double-flat-head single-screw rock-socketed bit Biconical monospiral rock helix Bipyramidal bispiral rock spiral φ 2500 bipyramidal bispiral rock helix Double flat-headed rock spiral Features: Helical blade can be conical head or flat head, cutting tool is bullet-shaped pick, tooth arrangement and helical blade. There are many types according to different strata. Applicable strata: hard soil layer, sandy gravel layer, strongly ~ weakly weathered rock stratum, hard frozen soil with developed joints, etc. B: Soil layer spiral Single-head single-screw soil lay screw drill bit Double-head double-screw soil layer screw bit Features: The spiral blade starts with flat head, and the spiral form can be divided into single-head single-screw, dhd drill bit , double-head single-screw and double-head double-screw, on which wear-resistant alloy steel shovel-type bucket teeth are welded. Applicable stratum: the stratum of clay, sandy soil, plastic frozen soil, etc. above the aquifer, the structure of which is not easy to be loosened and the strength of which is low after being disturbed. Type III: Rotary rock barrel drill Rock barrel drill Claw spring rock barrel drill Rock drill Rock drilling and soil extraction effect Features: The rock taking barrel is a ring-shaped barrel without bottom plate, and the cutting tool is a bullet-shaped pick welded at the lower edge of the barrel. It can be divided into rock barrel drill, rock drilling drill and claw-spring rock barrel drill. Applicable stratum: relatively hard bedrock stratum, large boulder layer and hard permafrost layer. Category IV: Special hard rock bit Rock barrel drill with centralizer Pick sand hopper with centralizer Description: Special drill bit specially designed for hard rock formation. The fifth category: body drilling bit Rotary excavation body drill bit opening status Type VI: bulldozer disc bit Pot bottom dozer bit Manually operated cone bottom dozer bit Features: There is a bulldozing plate inside the drill bit cylinder. Pressure is applied to the bulldozing mechanism above the drill bit through the pressure plate of the drilling rig. The bulldozing plate moves downward and the unloading is smooth. The bulldozing mechanism of the drill bit is divided into manual and automatic. Applicable strata: silty clay layer and other strata difficult to unload Type VII: rotary drilling under-reamed bit The under-reamed bit is mainly mechanical, which is relatively simple to use and maintain. There are up-opening and down-opening bits, and the opening mechanism is generally four-link, which is used for soil, strong wind, moderately weathered strata and even hard bedrock. Because the rotary drilling is a non-circulation drilling, the slag can be removed with a slag removal bucket after the bottom is expanded. Underreamer bit Bottom reaming state of underreaming bit Class VIII: SMW drilling tools The SMW method is used for the construction of underground continuous wall. It has the characteristics of spiral wing and mixing wing arranged alternately. With the repeated drilling and mixing, the cement slurry and soil can be fully and evenly mixed. The multi-axis drilling method is adopted. The drill pipe is a hollow pipe, and the front end of the drill bit has a discharge outlet for pressure injection of cement slurry. Its application scope and characteristics are as follows: SMW diaphragm wall can be used not only as a reliable water retaining wall, but also as a retaining wall and a supporting wall for resisting soil pressure. It adopts multi-axis drilling, with high construction efficiency, high precision of groove formation, and the reinforcement depth can reach 30-40 meters. Groove thickness up to 400-800 mm. And due to the unique stirring mechanism and the complete lapping construction method of the mutual reverse rotation among the stirring blades, And that mix is more uniform, and the strength and the anti-seepage capability of the wall are stronger. Category IX: CFG Long Auger Long auger drilling tool: The drilling tool is in the form of continuous long auger. The drill has the function of pouring concrete into the central pipe, and its top is equipped with an air release valve. The bottom of the central pipe is provided with a concrete outlet, and the outlet is provided with two valves which can be opened and closed. Before the drilling tool begins to drill the soil, the valve shall be closed to prevent soil, sand or water from entering the central pipe, and the valve shall be opened when the pump delivers concrete. Long spiral drilling tools can be divided into internal drive and external groove block drive long spiral drilling tools. Category X: Other supporting tools There are many tools related to rotary drilling, and the following is a brief introduction to the more commonly used tools: Stirring cylinder Full casing Full casing shoe Square head reducer Drill pipe extension Category 11: Cutting tools for rotary drilling A: Bucket teeth Applicable strata for bucket teeth: silt, clay, sand layer, loose soil, plastic frozen soil and loose frozen soil, a small part of gravel layer and other strata with low strength and loose structure. V19 and V20 rotary bucket teeth T25 straight teeth Type E1500 Shovel B: Pick Strata with high strength shall be used for hard soil layer, sand gravel layer, hard frozen soil, medium hard ~ hard rock stratum, weakly ~ moderately weathered rock stratum,mining drill bit, etc. U84 long pick Type BKH22 stub pick C: ZHC combination tooth Features: It is a combination of relieving teeth and cutting teeth, which are welded together. Applicable stratum: applicable to all kinds of strata, especially for the strong weathered layer with slightly loose structure and the sand and gravel layer. END Source: Foundation Engineering Return to Sohu to see more Responsible Editor:. wt-dthtools.com