Mumbai Coastal Road Project: delivering a transformational expressway to a world-level metropolis

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Projects •Mumbai Coastal Road Project: delivering a transfor...

Mumbai Coastal Road Project: delivering a transformational expressway to a world-level metropolis.

Mumbai, India

In India’s financial capital, we are contributing to a transformational project to build a new coastal road to improve public and private transport links and reduce congestion and pollution.

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Client

Municipal Corporation of Greater Mumbai (MCGM)

Timeline

Oct 2018 – Oct 2023

Environmental benefit

Reduced noise and air pollution thanks to freer flowing traffic and a new and efficient BRT system, improving inhabitants’ quality of life.

Efficient public transport and quality of life.

32%

The proportion of the project area reserved for landscaping and green spaces.

20%

The proportion of project area allocated to promenade space with lighting and street furniture.

4 to 20times less expensive

The lower cost of a BRT system compared to a light rail system with equivalent ridership.

About MCRP.

With a population of 12.4 million and fast-growing commuter traffic over the past 20 years, all in a reduced aree of 437 sq.km, Mumbai has been experiencing the downside of its remarkable and dynamic development. To improve the city’s productivity and quality of life for its inhabitants, MCGM began planning a coastal expressway to serve its northern suburbs as long ago as 2006.

The Mumbai Coastal Road Project will help decongest traffic along the west coast of Mumbai from Marine Drive to the Bandra Worli Sea Link, (BWSL) and significantly contribute to cutting transportation-related pollution.

A BRT system for fluid public transport
MCRP is also an opportunity to introduce of a bus rapid transit (BRT) system, which had also been identified as a clear need by preliminary traffic studies. The expressway will therefore have a third lane, coloured red, running along the outside edge of each carriageway. The lanes will be monitored with CCTV to ensure that buses and ambulances are the only vehicles to use this reserved infrastructure. The bur rapid transit (BRT) system will call on articulated buses with 190 to 250 passenger capacity and a minimum of four wide doors for optimal passenger alighting and boarding. Additionally, the bus stop shelters will benefit from CCTV monitoring, direct pedestrian access and real-time information on the next buses arriving for each route.

Three packages for a complete link
The project is divided up into three packages, all of which include raised sections, bridges or tunnels. Our Indian subsidiary, working in a joint venture with Cullen Grummitt & Roe (UK), was appointed by MCGM as Project Management Consultancy (PMC) on Package 2, running from Baroda Palace to the Worli end of the BWSL.

On this package, our role is to:

review designs and drawings submitted by the Contractor
supervise project implementation with a focus on compliance with drawings, technical specifications and contractual stipulations
oversee the timely delivery of the project
provide training to MCGM staff in contract management.

The challenge.

Land reclamation and sourcing.

With 25 hectares of land reclaimed from sea for the purposes of the Package 2 section, the project faced significant challenges in finding and installing the 3 million tonnes of rock with which to make up the sea wall and causeway, sometimes with rocks individually weighing up to 4 tonnes.

As PMC, our experts visited more than 100 rock sources suitable for providing reclamation and seawall material. Rock samples were rigorously tested before 30 sites were selected and deliveries scheduled to complete the project within the timeframe but also cause the least possible disturbance in this dense urban environment.

Imagine.

Foundation inspiration from Scotland.

In a first for India, the main bridge and interchange of the MCRP will be built using a monopile foundation system instead of the traditional pile group and pile cap arrangement. The monopile system is reputed to be a cost and time saving option, removing the need for temporary installations such as cofferdams, and also less intrusive to the subsea environment as it requires less excavation of the seabed.

As this foundation system had never been built before in India, the Technical Committee, which included representatives from all the stakeholders including the PMC, investigated the projects around the world on which monopile has already been implemented.

Following this study, a group travelled to Scotland to view the Clackmannanshire Bridge, the most recently-built bridge crossing the Forth estuary near Kincardine in the east of the country, which stretches 1,188 m with 26 spans, and which has been in service since 2008.
After this trip, we submitted a feasibility report to the Client concluding that the monopile foundation system could indeed be implemented on the MCRP.
We also appointed an expert to review and approve the contractor’s designs, and we have been ensuring that the monopiles have been executed on schedule, to budget and to the specified quality standards.
Result: the work programme enabled the project timeline to be cut by an impressive three months.

Achieve.

A complex bridge construction.

Several sections of MCRP include interchanges on seemingly gravity-defying raised carriageways several metres above the sea. The execution of the interchange bridge of Arm 2, featuring a 75-m radius over the sea, is one of these key challenges. Here, our task is to oversee the high-precision design and casting of segments, and to test the proposed Launching Girder / Plate Girder to ensure that the segments can be safely and securely erected over the pier cap and abutment in accordance with the design configuration.

Traffic diversion

Before starting work on the MCRP site, a temporary diversion road had to be built to channel traffic away from the construction site. Here, we ensured that all the safety precautions had been taken to minimise the effects on road and promenade users while the diversion works were taking place. We also made sure that the contractor had obtained all the necessary approvals in order to deliver this diversion road on schedule.

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