What keeps mega projects on track!: Detailed report
Here are key factors that ensure minimal cost and time overruns in project completion. June 2020
Some of these projects stand out for their size. Bogibeel is Asia’s second-longest road and rail bridge. Motera is the world’s largest cricket stadium seating 110,000. And so on.
These were a handful of the predominantly road, bridge, power, urban, digital infrastructure and railway projects that saw the Indian Government spend Rs.80 trillion on infrastructure between FY2008 and FY2019.
“The Lucknow Metro covering 22.87 km across 22 stations is the fastest built metro rail system in the country.” Let’s consider each of these major factors.
Several upcoming mega projects such as Mumbai’s Trans-Harbour Link and Coastal Road, some phases of Bharatmala and Sagarmala, the Diamond Quadrilateral, the bullet train and the Delhi-Mumbai Industrial Corridor are facing land acquisition issues.
“It takes a lot of time just to create work fronts, which leads to high cost implications,” observes Vipul Gakkhar, Infrastructure Consultant. He cites the Kishanganga hydropower project and a few phases of Bharatmala as mega projects that saw minimal delays because they faced minimal land acquisition and external approval issues. Phases of Bharatmala that were successful in his view, like the Rewa-Katni-Jabalpur-Lakhnadon Road, were road extension projects involving minimal land acquisition. The Kishanganga hydropower project is remotely situated in an area that was already under government control, so no extra approvals were required.
In the roads sector at least, the newer hybrid-annuity mode (HAM) of executing projects has significantly helped ease land acquisition by stipulating that the appointed date will be announced only after the government has acquired at least 80 per cent of the right of way, observes Rajeshwar Burla, Vice President, ICRA.
Burla cites some examples of projects that have benefited from this policy amendment: The four-laning of the Lucknow-Sultanpur section of NH-56 (127.4 km) completed in April 2019; the four/six-laning of the Kharar-Ludhiana section of NH-95 (76.01 km) completed in July 2019; the four-laning of the Yavatmal-Wardha section (64.93 km) completed in August 2019; and Package-3 of the Delhi-Meerut Expressway completed in September 2019.
“HAM marks a significant departure from the earlier BOT or annuity models, wherein contractors would typically start working even prior to the major acquisition of land, only to face stalls when contiguous land parcels were unavailable,” continues Burla. “Idling causes cost overruns, reduces profitability and extends project timelines.”
“The newer HAM also stipulates that if the NHAI is unable to acquire the remaining 20 per cent or so land parcels within 180 days of the appointed date, that part of the project can be descoped,” he adds. “While this is pro-project completion, it would inconvenience users and increase the completion cost to the NHAI, thus creating challenges in implementing de-scoping.”
It went on to set a record for producing more than 1.5 lakh cu m of concrete in a day and saw multiple large contractors such as L&T, Afcons, etc, work in tandem with each other.
Joshi expects two outcomes of the ongoing COVID-19 outbreak – labour scarcity and a paucity of finance – to create challenges in the execution of upcoming renewable power projects worth Rs.350-400 billion. The government must address both of these issues.
“All mega infra projects necessitate deep digging for piling, and, in that, uncertainty rules. Unprecedented factors cause cost overruns,” observes Gakkhar. Essentially, every infrastructure project is unique as there are so many project-specific challenges. Those implementing such projects do not really have a learning curve to climb as those implementing real estate do, making infra difficult to execute.
Hero Future Energies encountered hard strata during construction on acquired land for a solar power project, which made it challenging to excavate trenches needed to run cables and water pipelines for the cleaning system.
While constructing Medigadda Barrage – the largest barrage of the Kaleshwaram Lift Irrigation Project, a mega initiative to tap the flood waters of the Godavari river for drinking water and agricultural purposes, to serve more than two-thirds of the state of Telangana – L&T found that the construction of the raft foundation required ground improvement. “The geotechnical investigation revealed certain weak areas in the ground strata that required strengthening,” explains SV Desai, Senior Vice President & Head-Heavy Civil Infrastructure IC, L&T Construction. “While methods like vibro compaction, dynamic compaction or rapid impact compaction were available, they are also time-consuming and costly. After a thorough analysis, we adopted the cement stabilisation dry-and-wet method.”
Three barrages included in the project, the Medigadda, Annaram and Sundilla barrages, 19 reservoirs and 20 lifts have been executed within the estimated timelines and budget. However, by the time certain extra works are completely constructed, the total spend may exceed the original budgeted cost of Rs.804.99 billion by up to 30 per cent.
Indian contractors typically did not prioritise project planning, which is crucial for mega projects, and are highly price-conscious, hence only willing to consider upgrading technology if it lowers operational costs, observes Vinay. To some extent, the prequalification criteria established to assess the contractor’s potential performance compels them to adopt technology.
Now, Vinay sees that contractors have begun integrating technologies and Internet of Things (IoT) into a detailed project plan and adopted digitalisation during the planning stage. Some technology advancements the industry is looking forward to, according to him: Green construction technologies; wider specification of the use of modular and prefabricated construction techniques; autonomous construction, integration of drones, virtual reality, and wearables; 3D printing; and building information modelling (BIM) for better interpretation, coordination and planning.
Leaders are already making use of these technologies. A major factor in the timely construction of the Motera stadium by L&T was the effective use of precast engineering. Subrata Datta, Project Director, Motera Stadium, L&T, elaborates: “What’s unique about this stadium are the huge HY (36 m high, 15 m wide and 1 m deep) and GY columns that form the outer façade with as many as 178 structural connections weighing in excess of 285 tonne that were precast in steel moulds. Casting one such column in situ would have taken the project team at least two months; with 43 such columns to erect, that was not an option. With precast technology, the casting was reduced to just two days. The greater advantage was that the columns gained the required strength in only 10-12 days.”
The columns enjoyed all the advantages of precast technology such as standardised delivery, enhanced quality, superior aesthetics, improved safety and operational efficiency, adds Dutta. Joshi sees growing scope for drone-based technology to monitor renewable energy projects in forest and hilly areas, and for greater automation in solar plants to counter labour shortages. Technologies that helped L&T complete Medigadda Barrage in a record 24 months include automation and optimised formwork that cut the cycle time for the construction of a single pier.
All the sequential activities of cutting, bending, rolling, welding and painting to fabricate the HM radial gates involving 26,000 mt of structural steel were fully automated. Instead of a conventional 2.4 m formwork height, an optimised formwork height of 5 m was adopted to speed up execution. Later, the formwork height was raised to 7.5 m and further to 10 m to achieve a concrete pour of 4,045 cu m.
Implementing new technologies will be tricky, cautions Vinay, because it will necessitate integration across the ecosystem, rationalisation, standardisation, building digital talent, securing digital adoption, and establishing the value and return on investment.
“Our ultimate digital vision is to have a ‘connected workman’ who with his ‘wearables’ (sensors and beacons) can be tracked for location and health status, and hence play a vital role in ensuring his safety and productivity by preventing him from venturing into no-go zones, and deploying or resting him respectively,” he explains.
Vinay emphasises the need to maintain dormant equipment through the lockdown to resume work speedily thereafter. Completing pending project documentation and upgrading the skill sets of employees would also help ensure faster execution when construction resumes. Here’s to getting back to work!
Here’s a run-through of the proposed mega projects by sector:
“In future, the key is to set up true hybrid plants where the same inverter of the wind plant becomes common with the solar plant with its BOP (balance of plant) system to service wind generation and solar generation with an efficient and proportionate ratio,” he adds. “This kind of system will remain more cost-effective with higher yield to cope up the floor prices equivalent to other electricity generation mechanism.
In future, the increasing efficiency of batteries will add another dimension into such a hybrid system to make a more reliable tribrid system where energy storage facilities enable both plants to work simultaneously to generate energy – one plant to feed the grid and the other to feed storage. Thus, the intersystem curtailments will be controlled and support the grid network when demand peaks.”
Raaizada foresees the emergence of virtual power plants, technology that aggregates scattered energy-generating units on one common computerised platform. He sees a role for microgrid solutions in hybrid plants and the evolution of a packetised system where the generation of energy is scheduled on the basis of predeclared, precalculated, atomised consumption patterns from different DISCOMs and captive sources.
He also expects tariffs to be linked with energy management systems to decide how much energy should be generated from what source.
“When India embarks on offshore wind plants, which is a matter of time, contractors seeking a slice of the pie will need to acquire the skills to construct floating rigs, underwater foundation construction technologies, and material handling technologies to lift the individual components of the wind turbines,” adds Balawant Joshi, Managing Director, Idam Infrastructure Advisory. “These skills will need to be imported or acquired from the UK and Nordic nations.”
- CHARU BAHRI
To share your views on Mega Projects in India, write in at feedback@ConstructionWorld.in