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.

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