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09/03 16200 -5 03- 1438.A -R <br />b) Tracks shall be constructed so as to remain rigid at joints <br />and allow no appreciable flexing as power unit passes. <br />5. Jacks - Hydraulic, mechanical or manual power units providing <br />horizontal thrust for pushing casing or carrier pipe. Shall have <br />sufficient power to satisfactorily complete the proposed crossing <br />according to the manufacturers recommendations. <br />a) Hydraulic -Shall be in sound operating condition. Hoses <br />shall not be cracked or split; all couplings and fittings shall <br />be tight and entire system reasonably free from leaks. <br />Hydraulic cylinder rods should be clean and smooth to <br />prevent damage to cylinder seals. <br />b) Mechanical - Includes manual and power drivers, ratchet <br />type jacks, winch and pulley systems. All mechanical <br />jacking systems shall be in sound operating condition with <br />no broken welds, excessively worn parts, broken teeth, <br />badly bent or otherwise misaligned components. All ropes, <br />' <br />cables, clamps and other non - mechanical but essential items <br />shall be in sound condition. <br />1 <br />thrust <br />c) Other - Devices of systems for providing horizontal <br />other than those previously defined in the preceding <br />r <br />sections shall not be used unless approved for use by the <br />Department prior to commencement of work. Consideration <br />for approval will be made on an individual basis for each <br />properly permitted crossing. The proposed device or <br />system will be evaluated prior to approval or rejection on its <br />potential ability to complete the crossing satisfactorily <br />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 />' <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 hacking unit <br />' <br />is transferred to the casing. <br />09/03 16200 -5 03- 1438.A -R <br />