Specifications Part 1 - Water Supply, Sewerage and Tube Well Works
Specifications Part 1 - Water Supply, Sewerage and Tube Well Works
Specifications Part 1 - Water Supply, Sewerage and Tube Well Works
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except those who actually ignite the fuse, shall withdraw to a safe distance of atleast 200 metres from the blasting site. Audio warning by blowing whistle shallbe given before igniting the fuse.15.3.7.2 Blasting work shall be done under careful supervision <strong>and</strong> trained personnelshall be employed. Blasting shall not be done with in 200 meters of an existingstructure, unless specifically permitted by the Engineer-in-Charge in writing.15.3.7.3 All procedures <strong>and</strong> safety precautions for the use of explosives drilling <strong>and</strong>loading of explosives drilling <strong>and</strong> loading of explosives before <strong>and</strong> after shotfiring <strong>and</strong> disposal of explosives shall be taken by the contractor as detailed inIS 4081, safety code for blasting <strong>and</strong> related drilling operation.15.4 Shoring & timbering15.4.1 General All trenches in soil more than 1.5 m deep shall be securely shored<strong>and</strong> timbered. Sal wood shall be used for shoring <strong>and</strong> timbering a trench.15.4.2 All trenches in friable or unstable rock exceeding 2 m in depth shall be securelyshored <strong>and</strong> timbered. The shoring shall extend at least 30 cm above thevertical sides. Shoring <strong>and</strong> timbering shall be carried along with the opening ofa trench.15.5 Precautions regarding measurement of earth work :15.5.1 The following work shall not be measurement separately15.5.1.1 Setting out works, profiles, etc :15.5.1.2 Site clearance, such as cleaning grass <strong>and</strong> vegetation:15.5.1.3 Unauthorized bettering or benching or excavation;15.5.1.4after measurements;15.5.1.5 Forming (or leaving) steps in sides of deep excavation <strong>and</strong> their removal aftermeasurements;15.5.1.6 Excavation for insertion of planking <strong>and</strong> strutting;15.5.1.7 Unless otherwise specified, removing slips or falls in excavations; <strong>and</strong>15.5.1.8 Bailing out or pumping of water in excavation from rains.15.6 Measurement of excavation in trenches including rock cutting15.6.1 In uniform ground areas excavation in trenches, the measurement of thecutting of trenches shall be made in cum.15.6.2 In areas were the ground is uniform, levels shall be taken before the start <strong>and</strong>after the completion of the work to determine the quantity of excavation intrenches.15.6.3 Where soft/disintegrated rock <strong>and</strong> hard rock are mixed the measurement forthe total quantity shall be made by method (18.6.1) <strong>and</strong>/or (18.6.2) givenabove. The hard rock excavated shall be stacked <strong>and</strong> measured in stack. Thequantity of the hard rock excavated shall be arrived at by applying pre-Urban Administration & Development Department Page 179
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