McLaughlin introduces innovative pipeline boring machine
The cradle boring method helps save pipeline contractors time because it’s not necessary to set up the project as a construction pit, which is often necessary with pit-launched auger boring. Instead, a trench the length of the casing is excavated and the cradle boring machine, along with the casing, are suspended in the trench using pipe-laying or side-boom equipment. This reduction in setup time can help pipeline contractors complete more bores per day.
“Cradle boring machines were widely used during the pipeline boom of the ‘60s and ‘70s as a means to install longer sections of pipeline casing in a more time-efficient manner,” says Dave Gasmovic, president of McLaughlin. “With the recent increased demand for pipeline expansion, McLaughlin re-engineered this proven machine design to include state-of-the-art safety and control features.”
The McLaughlin CBM 48 is capable of installing steel casings ranging from 10 to 48 inches (25 to 122 cm) in diameter, and casing sections up to 120 feet (36.6 m) can be installed in one pass. The ability to install longer sections of steel casing is what sets the cable boring machine concept apart from traditional pit-launched auger boring.
Powered by a 162 horsepower (121 kW) air-cooled, turbocharged Duetz diesel engine, the CBM 48 produces 170,000 ft-lbs (230,000 Nm) of auger torque. The transmission offers five forward speeds and one reverse speed, and a patented, operator-presence-control, hydraulic clutch ensures quick driveline shutdown in an emergency.
A powerful 32.5-ton (29.48 tonne) hydraulic winch pulls the machine forward in the trench and offers an innovative, adjustable winch pulling speed feature. The operator can set the winch pulling speed with the touch of a dial and adjust it to a variety of infinite speeds. This eliminates the need to feather the speed of the winch throughout the bore, helping to enhance productivity and reduce operator fatigue.
Three hydraulic chain vises hold the steel casing firmly in place to the cradle boring machine. Chains running over the casing attach to one of the hydraulic cylinders, which tighten the casing to the unit. The system monitors the cylinder pressure to ensure even pressure is maintained throughout the bore.
A centrally-mounted, fully-adjustable seat provides the operator with a clear view of the boring process and easy access to the control console, which offers joystick and switch functionality.
