How to select cfa auger tools for soilmec sr75 cfa rig ?

Continuous Flight Auger (CFA) od750mm SOILMEC SF65 CFA RIG

750mm cfa auger for soilmec sr65 drill rig

 CFA auger od750mm with soilmec cfa coupling xhd5 used on soilmec sr65 rig for Continuous Flight Auger pile

Continuous Flight Auger (CFA) mode with a 750 mm diameter auger represents a standard, high-efficiency setup for medium-to-large deep foundation piling.Technical Details for a 750 mm CFA Auger Tooling

When selecting or operating a 750 mm auger stem on the SR-65, the following tooling configurations are standard:

1. Joint & Hex Connection

Hex Joint Sizes: Typically standard SW 150 or SW 200 heavy-duty drive hexes with dual retaining safety pins.

Hollow Stem ID: Inner concrete delivery tube is usually 100mm to 125 mm 4" - 5" inside diameter to allow high-volume concrete pumping without excessive line pressure.

2. Cutting Head & Teeth Selection

Soft to Medium Soils (Clays, Silts, Sands): Flat teeth / bullet teeth combination with a standard pilot bit.

Hard Clay / Dense Gravel / Weathered Rock: Heavy-duty round shank carbide bullet teeth (e.g., 25 mm or 38/30 mm shanks) for aggressive penetration.

Bottom Plug: Flap-type or lost-cap/knock-out plug fitted at the tip to prevent soil ingress into the hollow stem during drilling.

3. Star Cleaners & Guides

Auger Cleaner: Hydraulic star/rotary cleaner mounted near the bottom of the mast, sized specifically for 750flighting to clear spoil during extraction.

Auger Guide: Lower mast guide inserts matched to 750 outer diameter to maintain verticality during collar drilling

A 750 mm Continuous Flight Auger (CFA) string equipped with Soilmec XHD5 hex couplings is a high-torque continuous auger setup commonly deployed on medium-to-large Soilmec rigs (such as the SF-55, SF-65, SF-70, SR-65, or SR-70)Technical Specifications Overview

Drilling Diameter : 750 mm

Coupling Connection: Soilmec XHD5 (Extra Heavy Duty 5-inch)

Drive Type: 190 mm Hexagonal tapered male/female joint with 2 quick-lock safety pins

Internal Concrete Shaft (Hollow Stem ID): 125 mm 5 inch) nominal bore for pumping high-slump concrete or grout

Stem Construction: Heavy-wall / double-wall central steel tube designed to absorb high torsional stress () without collar deformation

Structural & Design Features

1. Central Stem & Flights

Main Tube: Typically heavy-duty structural tube (e.g., ST52 / S355 steel, approx. 203mm to 219 mm OD with 20-40 mm wall thickness depending on depth rating).

Flighting:

Pitch: Optimized for spoil evacuation while maintaining flight strength.

Thickness: 16–20mm main flights, with thicker lead flights (25–30mm) at the starter section.

Wear Protection: Hard-faced welding on flight outer edges or tungsten-carbide strip inserts.

2. XHD5 Hex Coupling

Pin Lock System: Dual transverse safety pins prevent accidental decoupling during rotation or reverse extraction.

Sealing: Internal O-ring seals at the tapered joint prevent grout/concrete leakage under pumping pressures

3. Lead Auger / Starter Head Options

Clay / Medium Soil: Fitted with flat teeth

Hard Ground / Weathered Rock: Fitted with round shank chisel picks (e.g., B47K / B43H holders).

Bottom Valve: Spring-loaded or disposable knock-out plug at the concrete outlet bit.

1,SPECIFICATION OF CFA AUGER

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