How to do Excavation in Trenches for Pipelines & Cables as per CPWD Norms by Civil Guruji Norms. скачать в хорошем качестве

How to do Excavation in Trenches for Pipelines & Cables as per CPWD Norms by Civil Guruji Norms.

#CivilPracticalSiteTraining #CivilGuruji #CivilEngineersTrainingInstitute How to do Excavation in Trenches for Pipelines & Cables as per CPWD Norms by Civil Guruji Norms. Like Share & Subscribe Book Your Seat, Limited Seat Left Registration Open Call :- 9111001234 Big Surprise for Civil Engineers | Live at 9:00 pm Practical Training Detail:-    • Видео   Register Now and Pay Later:- https://www.civilguruji.com/s/store/c... Download Details:- http://tiny.cc/Download-Course Branch Address : 1. DELHI - NCR Civil Guruji - 25, gate no. 1, behind kailash hospital knowledge park -1 Greater noida (201308) 2. BHOPAL Civil Guruji :- at Hind convent school Naveen Nagar, Bhopal, Madhya Pradesh 462010 3. LUCKNOW Civil Guruji :- at Prayag public school Sandaulli Umarpur ,Near Juggaur railway station road, Lucknow 225003 ABOUT THIS VIDEO In this video Er. Vivek Kumar Pandey discuss about, How to do excavation in trenches for pipeline & cables, according to CPWD Norms|With complete CPWD specification DSR details EXCAVATION IN TRENCHES FOR PIPES, CABLES ETC. AND REFILLING This shall comprise excavation not exceeding 1.5 mts in width or 10 sqm in plan and to any depth trenches for pipes. Cables etc. and returning the excavated material to fill the trenches after pipes, cables etc. are laid and their joints tested and passed and disposal of surplus excavated material upto 50 m lead. Width of Trench (a) Upto one metre depth the authorized width of trench for excavation shall be arrived at by adding 25 cm to the external diameter of pipe (not socket/ collar) cable, conduit etc. Where a pipe is laid on concrete bed/ cushioning layer, the authorized width shall be the external diameter of pipe (not socket/ collar) plus 25 cm or the width of concrete bed/ cushioning layer whichever is more. (b) For depths exceeding one metre, an allowance of 5 cm per metre of depth for each side of the trench shall be added to the authorized width (that is external diameter of pipe plus 25 cm) for excavation. This allowance shall apply to the entire depth of the trench. In firm soils the sides of the trenches shall be kept vertical upto depth of 2 metres from the bottom. For depths greater than 2 metres, the excavation profiles shall be widened by allowing steps of 50 cm on either side after every two metres from bottom. (c) Where more than one pipe, cable, conduit etc, are laid, the diameter shall be reckoned as the horizontal distance from outside to outside of the outermost pipes, cable, conduit etc. (d) Where the soil is soft, loose or slushy, width of trench shall be suitably increased or side sloped or the soil shored up as directed by the Engineer-in-Charge. It shall be the responsibility of the contractor to take complete instructions in writing from the Engineer-in-Charge regarding increase in the width of trench. Sloping or shoring to be done for excavation in soft, loose or slushy soils. CLASSIFICATION OF SOILS The earthwork shall be classified under the following categories and measured separately for each category: (a) All kind of soils: Generally any strata, such as sand, gravel, loam, clay, mud, black cotton moorum, shingle, river or nallah bed boulders, siding of roads, paths etc. and hard core, macadam surface of any description (water bound, grouted tarmac etc.), lime concrete mud concrete and their mixtures which for excavation yields to application of picks, showels, jumper, sacrifiers, ripper and other manual digging implements. (b) Ordinary rock: Generally any rock which can be excavated by splitting with crow bars or picks and does not require blasting, wedging or similar means for excavation such as lime stone, sand stone, hard laterite, hard conglomerate and un-reinforced cement concrete below ground level. If required light blasting may be resorted to for loosening the materials but this will not in any way entitle the material to be classified as ‘Hard rock’. (c) Hard rock: Generally any rock or boulder for the excavation of which blasting is required such as quartzite, granite, basalt, reinforced cement concrete (reinforcement to be cut through but not separated from concrete) below ground level and the like. (d) Hard rock (blasting prohibited): Hard rock requiring blasting as described under but where the blasting is prohibited for any reason and excavation has to be carried out by chiseling, wedging, use of rock hammers and cutters or any other agreed method.