pf_01916 - Laserfiche WebLink

Home

SECTION 02665 WATER SYSTEM 3.02 PREPARATION OF FOUNDATIONS FOR PIPE A. The bottom of the trench shall be shaped to conform as nearly as possible to outside of the pipe, particular care being taken to recess the trench bottom in such a manner as to relieve the bell of the pipe of all load. B. If the foundation is good firm earth, the earth shall be pared or molded to give a full support to the lower third of each pipe, and if necessary, to secure a proper bearing for thu pipe, a layer of concrete, fine gravel, or other suitable material shall be placed. This same means shall be used to secure a firm foundation in case the excavation has been made deeper than necessary. 3.03 LAYIS�G OF PIPE A. Pipe shall be laid to an 8'-0" minimum depth of cover or to oie centerline or invert depth shown on the Drawings. Mains shall be installed in a thorough, workmanlike manner, using proper fittings to suit prevailing conditions. B. The interiors of the pipes shall be thoroughly cleaned of all foreign matter before being lowered into the trench and shall be kept clean during laying operations by means of tight plugs or other approved methuds. No trench water shall be allowed to enter the pipes or fittings. At all times when work is not in progress, all open ends of pipes and fittings shall be securely closed. C. All pipe shall be visually inspected in the field for specification conformance and shall be rung with a light hammer to detect fine cracks before lowering into trench. 0. When pipes with straight and/or untapered or unbeveled ends are encountered, such ends shall be beveled smooth before assembly. Such ends may occur when pipe is Gut In the field, or when the spigot end differs from the type of pipe joint beir3 installed. When connecting to an existing pipe that has a greater wall thickness resulting in a larger outside diameter than the new pipe, the bell end of the new pipe or fitting shall be enlarged by machining and shall be considered incidental to the Contract. E. All plugs, caps, tees, branches, and bends deflecting 22-1/2 G grees or more shall be provided with thrust anchor or reaction backing against undisturbed ground with concrete bulkheads, or movement shall be prevented by attaching suitable clamps, adjustable tie rods or harness, rustproof treated. Reaction backing shall be so placed that the pipe and fitting joints will be accessible for repairs. Testing of mains shall not proceed until concrete thrust blocks or anchors have had sufficient time to attain design strength. Nigh el ly strength concrete may be used. Where friction clamps and tie rods are used for restraint, all joints within the following minimum distances shall be tied. 4 KKE1186