Drilling bits scope

1, soft, medium hard and hard rock is generally a complete homogeneous form is appropriate diamond head; hard, hard and broken, UNEVEN, the fissures and high abrasive rock pregnant should use diamond head . 2, the matrix hardness should be based abrasive rock, crushing degree of hardness, particle size and other factors to choose from, the main factor is the degree of rock grinding and crushing. Strong rock grinding, crushing degree powerful, soft, coarse grained selection of hard matrix. On the contrary, abrasive weak, homogeneous complete, hardness, degree of fine rock particles (such as "slippery" rock) selected matrix should be soft. Such as abrasive and hardness conflict, then subject to abrasive, such as the case of strong and abrasive hardness of the rock, the carcass should use special hardware. Otherwise, wear rock matrix quickly, so that the core drilling bit to lose the ability to work. 3, the rock complex, abrasive stronger, more rigid, the choice of diamond grade should be possible, should the finer diamond size. 4, strong abrasive rock, the more crushing, coarse, use a higher concentration of the carcass. 5, soft rock, crushing, grinding and strong, rigid matrix, using an impregnated bit, then core drill bits through the water outlet cross section of the site should be large, multi-outlet should core drill bits. On the contrary, the use of small outlet core drill bits.

Selection of a drill according to the geological conditions

 use single bottom of auger core drilling bit bucket, if the diameter is too small can or bucket with dumping soil clovenfooted board core drilling bit bucket. 2, mud, sticky soil is not strong, sand, cement poor gravel layer smaller particle size, can be equipped with a double bottom core drilling biting core drilling bit bucket. 3, hard clay: use a single port into the soil (single double bottom can) auger core drilling bit bucket, bucket teeth straight or spiral. 4, permafrost: less available ice bucket teeth straight auger hopper and auger core drilling bit bucket, can be large cone ice auger, a description that auger for soil (except silt outside) are valid, but there must be no use of groundwater in the case, in order to avoid the suction effect caused by stuck. 5, cemented gravel and strongly weathered rock: be equipped with a conical double bottom auger and auger core drilling bit bucket (large diameter single-port, dual-port with a small particle size) 6, stroke bedrock: drum cutter with coring core drilling bit - Tapered auger - rotary core Drilling Tools bucket digging double bottom, straight or spiral cutter core drilling bit - rotary core drilling bit bucket digging double bottom. 7. breeze bedrock: with cone core drilling bit coring barrel - conical auger - Rotary core drills bits bucket digging double bottom should be taken if the diameter is too large grade core drilling biting process.

Drum core drill

At present, there are two common: tube cutter drill (for medium hard rock and gravel), core drill bits tube (for hard rock and large boulders). In barrel coring drill bit in two categories, and with and without coring device to take points of core devices, depending on the difficulty of coring. Because cone core drill is mainly used for hard rock drilling and drill the ring area, if the conditions can also pass on part in the installation of reverse circulation core drill bit to improve drilling efficiency. 4, belled pile diameter drill bit does not increase without increasing deep foundation piles, in order to improve the bearing capacity of single pile, the design department is often achieved through the pedestal pile, rotary drilling rig construction is expanding bottom without any changes can be construction just choose belled drill can be. Belled drill used to mechanically based, such drills are relatively simple to use and maintain, there is the open and under the open, the opening of the four-link mechanism is generally used for soil, strong winds, weathered even hard rock formations. Due to non-circulation drilling Rotary core drills bits, completion of expansion after the end of the barrel with slag slag can be.

The classification of core drill bits

Rotary core drill biting rig construction of the strata vary, technical requirements and different, just by selecting different core drill bits to meet various construction requirements, so do the matching rotary core drill biting rig core drill bit work is very important. Impact rotary core drill biting rig core drill bit matching many factors, summed up in three aspects: stratigraphy; rig functions; hole depth, the specific requirements of the aperture, Shen ballast thickness Wall measures. First, the current classification of common auger core drill bit bit common spiral auger core drill bit, rotary bucket, drum core core drill bit, core drill bit belled, GRABBING cone core drill bit and hydraulic grabs, following a brief introduction by the class. 1, the auger (1) cone: Double double spiral for hard rock. Double single screw for weathered bedrock, gravel, soil, etc. containing ice. Equipped with a variety of the above core drill bit cutter through tooth pitch, helix angle of the change can be derived from the many types of core drill bits. (2) straight auger: bucket teeth straight Lo: Double double spiral, suitable for sand, cement poor small-diameter gravel; single-headed screw, suitable for sand, soil; single head single screw for poor cementation large diameter gravel, clay soil and hard clay. Straight screw cutter: a double spiral, three and four-Lo Lo, then apply hard rock or gravel. 2, auger core drilling bit bucket teeth can be divided by the installed cutter core drill bit bucket and bucket teeth core drill bit bucket; the floor can be divided according to the number of double bottom bucket and single bottom bucket; can be divided according to the number of open double doors and single bucket open bucket; can be divided according to taper cone barrels barrels barrels of core drill biting straight core drill bit bucket and bucket; can be divided according to the lower plate shaped pot bottom of the core drill bit core drill bit bucket peaceful struggle. Above structure combined with each other, plus whether vented, change door mechanism can be combined dozens of auger core drill bit bucket. Generally applicable double bottom formation core drills bits bucket wide range, single bottom applies only to tack a strong soil, two-door core drill bit formations suitable for a wide range of fighting, fighting only for single door core drill bit large diameter and pebbles hard clay.