Equipment and technology review: rocscience tunneling applications

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Courtesy of Rocscience Inc.

Allen Gwynnes Pumps– name resurrected

With a design and manufacturing history stretching back 150 years, Allen Gwynnes Pumps, a name long associated with the manufacture of large, performance critical pumps, is once again an active force in the market place, operating from its new head office location in Middlesbrough, UK. The company was acquired by NEI during the 1970’s, and then became part of Rolls Royce in the early 1980’s. During this time the name Allen Gwynnes Pumps was no longer in use in the market place.

Due to a reputation of ‘fit and forget’ reliability, it is believed that customers lost contact with the company during this quarter century lapse. However, Allen Gwynnes Pumps has since become part of the MMC group of companies, and is once again trading under its original name.

Allen Gwynnes Pumps supplies high performance pumps for use in power generation, tunnelling, land drainage and irrigation, quarrying, water and sewage treatment and chemical engineering, together with a wide range of general processing and industrial applications.

Eickhoff success with Milling Cutters

Founded in Bochum in 1864 Eickhoff Bergbautechnik is nowadays operating worldwide as a manufacturer of heavy-duty roadheaders of up to 120t for tunnelling and mining. Backed by decades of in-depth practical experience in cutting techniques, Eickhoff started to launch excavator-mounted, hydraulically driven milling cutters in the early 90s.

Since 1994 Eickhoff hydraulic milling cutters of the ETH series have been used for a wide variety of applications and achieved widely recognized successes around the globe. The ETH series consists of three different types: ETH 30,
ETH 50 and ETH 200; power: 100/150/270kW; weight: 1730/ 2780/7650kg. Possible fields of application include among others profiling and excavating work in tunnelling, milling of trenches down to a width of 70cm (true to profile
and without unnecessary overbreak), demolition, asphalt cutting and underwater construction down to an underwater depth of 10m.

Combinations of the Eickhoff milling cutter type ETH 30 and of the Liebherr tunnel excavator R 932 Litronic have proved to be extraordinarily successful for tunnel excavation and, more specifically, for cutting the precise tunnel profile after shotcreting. The ETH 50 is mounted on even heavier excavators. To date, the high performance potential of Eickhoff milling cutters has been proven in more than 50 tunnel projects worldwide.

In Switzerland where the ETH milling cutter series is already wellknown for its high efficiency in tunnelling, projects such Cern, Tunnel Ferden, Tunnel Gorgier, Tunnel Sévaz, Tunnel Porrentruy, Tunnel Concise, Äscher Tunnel, Lötschberg Basis Tunnel North are all applications which testify to its unique features.

Derrick DE-1000™ VFDTM Smart Centrifuge

The Derrick DE-1000TM VFDTM (Variable Frequency Drive) is a new concept in centrifuge operation and control. The centrifuge offers flexibility in system control enabling it to handle a wide range of feed slurries. Automatic load sensing and feed pump control enable automated performance optimisation. The bowl assembly can be operated between 0 and 4000RPM, which can result in an internal centrifugal acceleration of more than 3000 G’s. To accommodate low levels of agitation and rapid solids removal, the conveyer is capable of differential speeds from 1 to 100RPM.

The DE-1000TM VFDTM is mounted on a portable skid that includes a two point effluent discharge for easy setup. All rotating assembly components are manufactured from corrosion resistant 316 grade and high strength stainless steel alloy materials.

Liquid and solid bowl heads are machined from forgings while the bowl and conveyer hubs are constructed from centrifugally cast stock. The drive system consists of two explosion-proof inverter duty motors. The first is a 37.3kW motor which is directly connected to the bowl through a 1.4:1 pulley ratio. The second consists of a 7.46kW HP motor which is connected to the conveyer gear-box input pinion shaft.

Each motor is powered by a high performance pulse width modulator (PWM) AC drive with insulted gate bipolar transistor (IGBT). Each of the motor drives and other peripheral devices are controlled by an environmentally robust IBM compatible Pentium PC. The PC and all other devices communicate through a high-speed, machine level control network.

PC control offers unlimited operating flexibility while allowing long term data storage so that critical parameters can be logged into historical trends. In addition, remote monitoring and control of the centrifuge can be accomplished from an adjacent control room or from thousands of miles away. Various configurations are possible and multiple user access over simple telephone lines/LAN enables easy troubleshooting.

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