1000mm Double Cut Rock Drilling Auger Used for Bauer-Bg24 Rig for Bored Pile Foundation Work

1000mm Double cut rock drilling auger used for bauer-bg24 rig for bored pile foundation work 1000mm double cut rock auger used for bauer-bg28 for bored pile foundation work 1000mm double starter rock auger used for bauer-bg36 rig for bored pile foundation work 10000 mm Double cut Conical Rock Auger used for bauer-bg33 drill rig for bored pile foundation work Heavy Duty - Double Start Rock Auger) Tianjin huachang xingye technology co ltd Heavy Duty double start auger built-in with 30 mm round shank pick. Generally used for cutting medium-soft rock formations, high fractured medium-hard rock formation and decompressed rock formations. Double cut rock auger Main application:- Generally used for cutting medium-soft rock formation, high fractured medium-hard rock formation and decompressed strong rock (10 - 100 MPa). DCRA is recommended is un uncased bores and for bigger diameters, Features:- Kelly box: 130-150-200 - other available upon request Teeth: round shank picks B47K22H or B40K12 other available upon request. Round shank rock teeth pilot bit Wear protection: hard facing (standard) or wear stripe (optional) or tungstuds (optional) NO D TOTAL LENGTH T1/T2 P1/P2 H1 d KELLY BOX WEIGHT 1 800 2000 30/20 500/600 1200 Ø219*30 200 700 2 1000 2000 30/20 500/600 1200 Ø219*30 200 870 3 1200 2000 30/30 600/600 1200 Ø245*30 200 1210 how to choose double cut rock auger? Choosing a double-cut rock auger comes down to balancing the compressive strength of the rock with your rig's torque capacity. While a single-cut auger penetrates faster in soft ground, a double-cut auger balances the torsional forces, making it essential for keeping large-diameter holes straight in hard rock. 1. Match the Cutting Teeth to Rock Hardness The teeth are the most critical component of your selection. For rock applications, you will almost exclusively use round shank chisel teeth (bullet bits). Medium-Soft to Medium Rock (10 to 50 MPa): Look for standard bullet bits with a wider spacing. This allows larger rock fragments to pass through without clogging the flighting. Hard Rock (50 to 100+ MPa): Choose heavy-duty, narrow-spaced bullet bits with thicker tungsten carbide tips. Staggered tooth positions are vital here so each tooth cuts a concentrated, narrow track rather than trying to plow a wide furrow. 2. Evaluate the Bottom Flighting Configuration Double-cut augers have two starting flights apart, but the base construction varies depending on how hard the formation is: Double Cut / Single Flight: The base has two cutting edges to balance drilling forces, but it tapers quickly into a single flight leading up the stem. This maximizes space for large gravel, cobbles, or fractured rock pieces to lift easily. Double Cut / Double Flight: Two separate flights wrap all the way up the auger body. This layout is built for highly stable, hard rock structures because it maximizes the material transport stability, though it reduces the maximum fragment size the auger can carry. 3. Select the Right Pilot Bit The pilot bit keeps the tool centered, preventing "walking" when you first strike a hard rock ledge. RP4 (Fishtail) Pilot: Best if you are transitioning through a thick layer of soil, clay, or highly weathered rock before hitting solid strata. Box-Type Rock Pilot: Loaded with bullet bits matching the main flights. This is mandatory for direct entry into medium to hard bedrock layers. 4. Specify Plate Thickness and Wear Protection Hard rock drilling causes extreme abrasive wear on the edges of the flights (the periphery). Flight Thickness: Ensure the lead flights are at least 25mm to 30mm thick (or feature double-layered plates at the cutting edge). Hardfacing: Look for heavy tungsten carbide hardfacing welds along the outer edge of the flights. For high-abrasion formations (like sandstone or granite), choose models with wear-resistant blocks or buttons welded to the flight sides to prevent diameter shrinkage over time. A Quick Diagnostic Rule: If your rock is heavily fractured or contains large cobbles, choose a Double Cut / Single Flight to avoid jamming material between tight flights. If you are drilling into solid, high-MPa intact bedrock, choose a Double Cut / Double Flight with closely staggered bullet bits to maximize fracturing efficiency. Tianjin huachang xingye technology co ltd