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Mine tunnel tion work is laborious. The swing shift must finish the concrete place- ment and then begin clean-up of the nest 500-ft. section of invert for the nest die's concrete. This work con- tinues throughout the night. The in- vert base must be cleaned and gravel brought in to bring it up to the specified grade and the drainage sys- tem must be installed. This work re- quires running the 550-ft. conceyor system back over the fresh concrete and its subsequent re-positioning af- ter completion of the base clean-up and preparation. l\'orking the project three shifts a day, siz clays a week, requires a work force of approxi- mately 375 men. There was considerable logistics work behind implementation of the simultaneous concreting and rail-lay- ing system. All kinds of equipment and materials were cached in cut- outs along the tunnel so as rant to interrupt the continuous production line once work began. Oil, grease, spare parts, service equipment, the 100,000 rail pads required and the 300,000 bolts were moved in. There is not much unusual about the bitching operation outside the portal. Dravo is using a C. S. Johnson plant with a 3-vd. turbine miser. It came equipped with a 1-yd. mixer when it was anticipated that the plant would be called upon for only about 15,000 yd. of mix during the excavation stage. Then Dravo got the contract for the lining work, with the result that the Johnson plant will produce closer to 100,000 yd. Installation of the electrical sys- tem, including both the 1400-volt overhead power line for the ore trains and the tram control system imbedded in the invert slab, is being accomplished under subcontract. The drainage system was designed by AMAX for a variety of water con- ditions in the tunnel. Where ooh' slight ,rater is en~:ountered, the con- tractor is removing the poor mate- rial and placing clean gravel filter blanket on the base. \Vhere much ,eater is encountered, he is install- ing 6-in. perforated drain pipe in the gravel, intended !o carry the water into catch basurs and from there to a 12-in. discharge :system. Much of the equipment on the job had to be custom-designed or modi- fied for the task. 'Lhe long conveyor, driven by hvo nudnrs, is a mortified Rotec with an ]8-in. wide trough belt capable of traveling 700 fpm. The 65-(t. piggy-back conceyor ,vas built on the job. The paving train was custom designed, as were the rigs for drilling and placing the rail pads and clips. Drivo is using 10 electric locomotives (six ASEA, hvo Jeffrey, and two Goodman) and three Plymouth diesel locomotives on the project. The plan as originally developed for constructing t}.e invert and plac- ing rail at a rapid pace has required little modification and daily produc- tion rates attest to rts success. hey personnel on the project for AMAX are: ~l. Cehrix, C. Tlorris, J. Witmer. For Craw they are: E. Opitz, project manager; H. C. Swan- son, project engineer, G. Veatch, general superiMet dent; R. \Vinner, concrete superintendent; D. Edwards, master mechanic Reprinted from Wertern Construction -September 1977, Copyright©1977 by Western Construction Magazine, Inc. BUTYL RUBBER rail pads are in place for laying of roil. This custom-designed Threader handles oll four rails simultaneously. WORKMEN TORQUE dewn The nu}s on }he bol}s holding anther clips as }he Bnal fax}ening of The rail. Rail placemen} followed contra}e werk by only a few days.