Specifications Part 1 - Water Supply, Sewerage and Tube Well Works

15.17.19 Temporary stoppages of work15.17.19.1open end of pipe shall be closed by a watertight plug or other means approvedby Engineer. During the period that plug is on, the contractor shall take properprecautions against floatation of the pipe owing to entry of water into thetrench.15.17.20 Testing and Commissioning(See Drawing No.-21)15.17.20.1 Testing and commissioning of pipes shall be done in accordance with therelevant specification.15.17.21 Water Tightness test.15.17.21.1 All hydraulic structures, either water supply or drainage etc., such as sewerlines, joints etc., or any other liquid containers shall have to be tested for watertightness.15.17.21.2 The contractor shall give all such hydraulic tests by making his ownarrangements for water filling and disposal of water after the test and shallrepeat this test, if necessary, until the requisite test results are obtained withoutany claim for extra cost or compensation. The water tightness test shall beconducted as specified in IS: 4127-1967.15.17.21.4 The contractor may use at the time of construction, for increasing the watertightness, approved proprietary chemicals only with the permission of theengineer to serve the purpose of the contractor to facilitate such type of workfor his own convenience and advantage.15.17.21.5 But in all such cases, the contractor will not be entitled to any extra rate. Thecontractor shall see that every effort is made to make structures and fixtureswater tight, by resorting to such chemicals and making efficient use ofproportion and grading of materials etc., as provided originally in thespecifications.15.17.22 Backfilling15.17.22.1 Trenches shall be backfilled with approved selected excavated material onlyafter the successful testing of the pipe line. The tamping around the pipe shall edone by had or other hand operated mechanical means. The water content ofthe soil shall be as near to the optimum moisture content as possible.15.17.22.2 Filling of the trench shall be carried out simultaneously on both sides of thepipe in such a manner that unequal pressure does not occur. Back filling shallbe consolidated by watering, ramming, care being taken to avoid damage tothe pipe line. In case of mild steel pipes / special, the spiders provided duringassembly and welding shall be retained until the trench is refilled andconsolidated. Where timbers are placed under the pipe line to aid alignment,these timers shall be removed before backfilling.15.17.23 Clearing of site- All surplus materials, and all tools and temporary structuresshall be removed from the site as directed by Engineer and the constructionsite left clean to the satisfaction of engineer.Reinstatement of road/footpath shall be done as per the requirements of theconcerned authority & specification of the works.Urban Administration & Development Department Page 195