Laserfiche WebLink
without undue stoppage and to maintain line and grade <br />within the tolerances prescribed by the particular conditions <br />of the job. <br />Jetting or water sluicing methods, jetting with compressed <br />air, or boring or tunneling devices with vibrating type heads <br />that do not provide positive control of line and grade shall <br />not be allowed. <br />6. Anchors and Braces - Jacking base or deadman used to provide a <br />rigid base from which the horizontal thrusting from the jacking unit <br />is transferred to the casing. <br />The jacking base or deadman must be sufficiently strong to <br />withstand the pressures generated by the jacking unit throughout <br />the jacking operation without appreciable movement or <br />deformation. <br />7. Dewatering Equipment - Equipment used to evacuate ground and <br />surface water from jacking and receiving pit areas and along path <br />of proposed bore. <br />a) Pump - Shall be in proper operating condition and off <br />sufficient capacity to satisfactorily dewater the pit and bore <br />areas under the conditions of the particular job. <br />b) Header Line - Collector pipe connecting pump with <br />individual swing joints, risers and well points in a well point <br />dewatering system. Header line shall be straight, free from <br />large dents, kinks or cracks and sufficient in size to pass <br />anticipated flow. <br />c) Swing Joints or Half Swings - Hoses or pipes that connect <br />individual well points and risers to header line. Swing joints <br />shall be undamaged and feature a workable stop cock or <br />equivalent device for controlling air intrusion into the <br />system. <br />d) Risers - Pipes connecting well points to swing joints should <br />be reasonably straight and otherwise undamaged. <br />r] <br />1 07/03 16200 -6 03- 1438.A <br />