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The core barrels should go through the full height of the building. The width of the core barrels should not be less than 1/12 of the total height of the tube. When the tube structure is equipped with corner tubes, shear...

The core barrels is in the central part of the building. It is surrounded by elevator shafts, stairs, ventilation shafts, cable shafts, public toilets, and some equipment rooms to form the central core barrels, which for...

Inner flat type: Mainly used for outer thickening of Drill Rods. Its characteristic is that the Drill Rods has the same internal diameter and low drilling fluid flow resistance; but the outer diameter is large and it is ...

The Drill Rods is a steel pipe with a thread at the tail, which is used to connect the surface equipment of the drilling rig and the drilling and grinding equipment or bottom hole device at the bottom of the well. The pu...

drill rods for trenchless guided and directional drilling are often subjected to bending forces while being subjected to greater tensile and torsion forces. When the drill rods passes through the curved section, the dril...