Question

Two workers must pass each other in a narrow utility tunnel wearing bulky clothing. What is the minimum clear distance of the tunnel?

Answer 1

U Vertica Vertical clearance i- maintain a minimum and other utility elevati line A minimum of 2 feet clearance between tumorral I utility lines. The actual location and tation of the existing utilities over oh under the tunnel alishment are to be determined but to design Horizontal clearance - for tunnels 72 inches and smaller diameter, maintain 15 feet horizontal clearance between outside of surrounding surface of sube face structures utilities and the outside diameter of the tunnet and tunnels greater than 72 inch diametch, determine the horizontal clearance. Typically the horizontal clearance will be greater than 15 sect Ends of tunnel : The ends of tunnel are not to be located in steep slopes, streams of drainage ditched Steep slope is defined as being 3 1 and higher othan to feet from the toe to the top of slope. Extend the ends of a tunnel at least fifteen feet begond the toe of a steep slope.