Safer Project Execution also Reduces Costs
Innovative HDPE pipe laying method cuts time
Safer Project Execution also Reduces Costs
Innovative HDPE pipe laying method cuts time
At the project site of IT City in Mohali, L&T Water and Effluent Treatment business’s team devised a new method for laying a nine-metre, deep trunk, sewerage HDPE line. The standard method involves lowering pipes using steel shoring and shuttering to avoid soil collapse. However, in spite of using a shoring box, there is the risk of a soil collapse and collection above the shoring box. Additionally, the use of MS shoring plates requires an 18MT Crawler Crane due to its high operating radius, resulting in additional execution costs. Moreover, executing pipe jointing at a nine-metre depth can also lead to life threatening situations.
New methodology devised by the L&T team
Based on the new method devised, the cross-section was reduced, since there was no human movement inside the trench. The slopes were designed to support the weight of the soil, and a wider cross section was adopted at the manhole chambers. Secondly, six-metre long HDPE pipes were joined above ground to a length of 30 metres prior to lowering in the nine-metre-deep trench. A subcontractor was encouraged to procure a Hydraulic Butt Fusion machine, which was then used to lower the pipes. Two 14 MT Hydraulic Cranes were used to lower 30-metre pipe spools. A 25 mm PP rope was used to pull one end of the belt from the ground level to remove the cotton belts from the lowered pipeline.
Result
The new method brought in cost savings to the tune of   17.2 million, with safe operations, and no time lost to injury. Moreover, the execution time was cut down by six months, enabling the team to complete laying of 10 kilometres of pipeline in a year. The job included fusion welding of 1,200 pipes, 0.3 million m3 of earthwork excavation and construction of 300 manholes.
   
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Through Attention
   
Water Positive
Campuses
   
L&T Creates History
in Nuclear Construction
   
Cream of
The Crop
   
Safer Project Execution
Also Reduces Costs
Safety First
   
Soil for Water –
A Winner All Round
   
Re-powering
Fallow Lands
   
Digitally Driven
Schooling
   
Keeping an Eye on
Mumbai - The L&T Way
Improving Attendance Through Attention
   
Water Positive Campuses
   
L&T Creates History in Nuclear Construction
   
Cream of The Crop
   
Safer Project Execution Also Reduces Costs
Safety First
   
Soil for Water –
A Winner All Round
   
Re-powering Fallow Lands
   
Digitally Driven Schooling
   
Keeping an Eye on
Mumbai - The L&T Way
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