Download Geometrically Invariant Watermarking Using Feature Points by Bas Chassery Macq PDF

By Bas Chassery Macq

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Each shoe should be properly shaped and sized to engage at least one-tenth of the pipe’s inside circumference and 100 mm wide for single joint and 150 mm for double joints. Rivets or other metallic fasteners used to hold the protective facing should be suitably countersunk to prevent contact with the pipe. During hoisting, wire slings should be of such length that the angle formed between each leg of the sling and the pipe is not less than 45 degrees. Yard concrete coated pipe should be raised or lowered to or from the stockpile, ground, or truck by means of end hooks engaging the ends of the pipe and should be carried by a wire rope or chain sling with “Spreader Bar” between lifting lines.

During transportation of pipe, tie-down cables should be inspected and retightened by the Executor during and after hauling. Extreme care should be exercised for hauling precoated pipes using suitable and approved material for padding. In transportation of yard concrete coated pipes, the bolsters of truck and trailer should have adequate bearing surface (as directed by the Engineer), to give necessary support to padding which protects the coating. 5 Hauling of Coating Materials Hauling of coating materials to right-of-way should be limited only to quantities necessary for the daily coating application.

The sides of the trench should be free of rock, loose stones, blasted debris, or other spoil likely to fall or blown around or on top of the pipe. To prevent the excavated material from falling into the trench, a strip with a minimum width of 40 cm should be left clear between the edge of the trench and the edge of the pile of excavated earth. In steep areas of hillside, before starting the work and where required, the Executor should provide suitable barricades or other similar protection in order to prevent the material from falling down the hill particularly when lines of communication, houses, services, water courses, and cultivations are found on the downslope side of the ditch.

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