First Large-Diameter Monopiles for Bridges in India with MHWirth Reverse Circulation Drill Rigs
MHWirth pile top drill rigs drive change in the bridge construction industry: For the first time on a bridge project in India, the structure will rest on monopile foundations of up to 3.5m in diameter instead of creating four pillars per pile.
Technology provided from MHWirth was able to reduce the number of pillars from 704, down to 176 for the 2,100 m long and 34 m wide Mumbai Coastal Road Project. MHWirth RCD drilling technology reduces construction work and related costs to complete the project.
Structural foundations have a significant impact on the total project cost, especially, when projects require foundations in hard rock and/or great depths. Therefore, drilling large-diameter piles becomes more and more common practice in today’s construction industry. At the Mumbai Coastal Road project, piles driven with reverse circulation drilling (RCD) technology will have a diameter between 2.5 and 3.5 m, depending upon their position. Four MHWirth pile top drill rigs – two Wirth™ PBA 818 and two Wirth™ PBA 936 – will realize the required diameters.
“With the challenging rock conditions and such large diameters, MHWirth RCD rigs provide the best drilling performance in the market and will significantly improve cost effectiveness for our customers”, explains Nikolas Schmitz, Head of RCD & Minerals at MHWirth. ”Additionally, RCD technology operates at a very low noise level, which makes it a preferred solution for projects in environmentally sensitive and residential areas.”
For the large monopiles at the Mumbai Coastal Road project, several trial piles are currently under construction. Once finished, there will be tests on their strength and durability to ensure that the prestigious project will lay on solid foundations.
MHWirth offers six different machine models to cover a diameter range from 0.6 to 8.0 m and drilling depth of up to 500 m in various geological conditions onshore and offshore. In addition to bridge construction, the rigs are widely used for foundations of superstructures and buildings, (elevated) metros, ports, offshore windmills and platforms or reinforcement drillings for water dam restoration.
June 29, 2021