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S. Each length of the pipe shall have the assembly mark aligned with <br /> the pipe previously laid and held securely until enough backfill has <br /> been placed to hold the pipe in place. Joints shall not be "pulled" <br /> or"cramped." <br /> T. Before any joint is made, the pipe shall be checked to assure that <br /> a close joint with the next adjoining pipe has been maintained and <br /> that the inverts are matched and conform to the required grade. <br /> The pipe shall not be driven down to grade by striking it. <br /> U. Precautions shall be taken to prevent flotation of the pipe in the <br /> trench. <br /> V. When moveable trench bracing such as trench boxes, moveable <br /> sheeting, shoring or plates are used to support the sides of the <br /> trench, care shall be used in placing and moving the boxes or <br /> supporting bracing to prevent movement of the pipe, or <br /> disturbance of the pipe bedding and the backfill. Trench boxes, <br /> moveable sheeting, shoring or plates shall not be allowed to <br /> extend below the top of the pipe. As trench boxes, moveable <br /> sheeting, shoring or plates are moved, pipe bedding shall be <br /> placed to fill any voids created and the backfill shall again be <br /> compacted to provide uniform side support for the pipe. <br /> W. Unless otherwise approved concrete thrust blocks shall be <br /> kw installed at all fittings and other locations as directed by the <br /> Engineer. Minimum bearing area shall be as shown on the <br /> Drawings. Concrete shall be placed against undisturbed material <br /> and shall not cover joints, bolts or nuts, or interfere with the <br /> removal of any joint. Wooden side forms shall be provided for <br /> thrust blocks. <br /> X. Restrained joints shall be installed where shown on the Drawings, <br /> required by IRCDUS Standards, or as directed by the Engineer. <br /> 3.14 MARKING FOR OPEN CUT METHOD <br /> A. Number 10 stranded conductor copper trace wire shall be spiral <br /> wrapped or affixed to the top of the pipe. See trace wire Detail M- <br /> 13 for specifications regarding installation. <br /> B. Trace wire is required over all pipes. <br /> C. A 2" wide magnetic I.D. location tape is required over all pipes. <br /> Tape is to be installed 12" below proposed grade and additional <br /> tape shall be adhered directly on top of pipe if required by IRCDUS <br /> engineering. <br /> 3.15 TRENCHLESS INSTALLATION OF PRESSURE MAINS BY <br /> DIRECTIONAL BORING <br /> 3 - 9 <br />