The management of construction noise and vibration using innovative mitigation methods and demonstrating that working hours could be extended whilst minimising community disruption.
Unique project considerations
Moorgate Shaft was one Crossrail’s most constrained Central London construction sites, with a range of highly sensitive commercial premises and residential dwellings surrounding the site. Due to earlier delays our client BAM Nuttall Kier JV was tasked with condensing the programme, making a difficult project even more challenging.
How we helped
We worked closely with the project team to develop a detailed understanding of the processes and plant involved. We then utilised computer noise modelling to iteratively predict and assess the noise impact of different plant configurations and schedule low-noise works during sensitive periods. The project also included the production of a 6-month ‘look-ahead’ of predicted construction noise to enable noise insulation and temporary re-housing to be planned in advance.
We obtained noise data from a particular D-walling rig that was planned to be used and undertook revised calculations of the Moorgate site using this new data. The analysis demonstrated that, combined with the rescheduling of some works, extended operation was possible without significant impacts to the surrounding areas and properties.
We utilised our strong relationships with Crossrail and the local authority to demonstrate that work hours could be extended without significant impact. The Section 61 consent was granted, and the programme length reduced.
We developed a web platform to report on the monitoring data and highlight any exceedances. The client used the platform to identify and explain the root causes of any exceedances of the Section 61 consent limit. Stakeholders were also allowed access to the report so they could review the compliance with the consent and project criteria.
The client had access to web pages detailing real-time noise levels, historical noise data and amber (warning of a potential breach) and red (indicating a breach) alerts. The amber alerts were used effectively by site staff to amend the works to help avoid breaches of the Section 61 consented noise limits.
Our work also involved re-baselining the ambient noise levels because the baseline provided by the client (using the lowest measured ambient noise levels) was not suitable for effective alerting of construction noise levels.
Section 61 consent and compliance were secured and strong stakeholder relationships were maintained. By going above and beyond compliance, Anderson Acoustics proved that work hours could be extended without significant impact on the community – reducing client cost and risk by shortening the construction time.
What the client said
“The quality of work produced was of a high standard and Anderson Acoustics provided valuable and consistent technical support to the site team. Their good relationships with Crossrail and the City of London proved invaluable when negotiating the consents for the site.”
Steve Lowder, C501 Project Manager, BAM Nuttall Kier JV
Image: Copyright, Crossrail Ltd.