1500mm double wall casing forge joint with bauer-bg screw joint match bauer-bg36 rotary drill rig

1500mm double wall casing forge joint with bauer-bg screw joint match bauer-bg36 rotary drill rig Casing oscillator use heavy duty double wall casing When pairing double-wall casing systems with a Bauer-BG 36 rotary drilling rig (or equivalent heavy class ~360 kNm torque rig), you are looking at one of the industry standard setups for full-casing bored piling in difficult, unstable, or water-bearing ground. 1. Key System Specs & Geometry Double-wall casings (DW-S standard series) feature an outer pipe and an inner pipe joined by internal vertical/spiral stiffening ribs. This design provides structural rigidity to resist crushing under soil/hydrostatic pressure and torques from high-power rigs or casing oscillators. Parameter Standard Dimensions / Spec Notes Typical Outer / Inner OD 880/800mm 1000/920mm 1200/1120 mm1500/1400 mm 2000/1880mm Match to standard casing drive adapter sizes. Total Wall Thickness 40mm to mm outer + inner + air/reinforcement gap) Prevents ovalization under high torque/crowd forces. Joint Type Conical screw connection with male/female forged/cast joint rings Reusable, high-torque transfer joints locked with casing screws/bolts. Segment Lengths 1m, 2m,3m,4m,5m 6m Combined to reach desired borehole depth. Inner Profile Flush / Continuously smooth No internal projections to catch augers or core barrels. Materials of casing joint:25CrMo, casing pipe materials:q355b 2. Rig Compatibility ( BG 36) The BG 36 (PremiumLine / KellyLine) provides up to 340-385kNm nominal torque depending on the installed rotary drive (e.g., KDK 340 K or KDK 385 S) and up to 400 kN crowd force. Casing Drive Methods: Direct Drive (Casing Drive Adapter / Twister): Driven directly via the BG 36 rotary drive (KDK) for lighter/shorter casing runs. Casing Oscillator (e.g., BV 1200 / BV 1500): For deep or long double-wall casing strings where ground friction exceeds the rig’s direct rotary limit. The BG 36 powers and manages the oscillator directly via its hydraulic system. Mast Axis Distance: The BG 36 Vario-masthead setup supports standard drill axis distances (100m to $1,400mm}$), enabling large-diameter double-wall casing installation. 3. Cutting Teeth & Bottom Accessories The starter casing (casing shoe) at the bottom of the double-wall string is fitted with heavy-duty cutting teeth to slice through obstruction layers, gravel, or hard rock sockets: Weld-on Tooth Holders: WS 39 / WS 52 style holders with replaceable pin-retained teeth (e.g., FZ or round shank chisels). Block/Weld-on Teeth: BR or BH type tungsten carbide teeth welded to the cutting ring for abrasive rock conditions. 4. Key Operational Advantages Flush Bore Hole: The flush interior eliminates internal ledges, preventing drilling tools (buckets/core barrels) from hang-up during trips in/out. Torque Transmission: The continuous double-wall skin distributes torsional load evenly, avoiding keyway tearing or localized buckling during oscillator operation. Dry/Secant Pile Accuracy: Higher verticality tolerance (<0.5) compared to single-wall casings, critical when installing secant pile walls. Tianjin huachang xingye technology co ltd