Background
The Government is investing around £2.8bn through its Science Capability in Animal Health (SCAH) Programme in a 12-15 year project to create a major new research complex at the existing Weybridge science campus.
In 2022, Anderson Acoustics were commissioned by Merrick & Company to undertake an outline noise and vibration impact assessment to evaluate the potential impacts of various construction scenarios on existing and proposed buildings, as well as sensitive receptors such as animals and humans.
What we did
The primary objectives of our assessment were to:
- Identify likely noise and vibration impacts during construction phases.
- Provide guidance on suitable construction methodologies and mitigation measures.
- Assist in the planning of construction options and phasing.
Development Options
Four main development options were considered for the campus, each with varying impacts on noise and vibration. The options included different stages of construction and occupation, with some buildings being completed while others remained in the shell stage. The assessment focused on minimizing direct vibration transmission and re-radiated noise.
Sensitive Receptors
Sensitive receptors on the site included:
- Buildings housing sensitive equipment (e.g., electron microscopes).
- Animal housing facilities (e.g., buildings containing mice).
- Human occupants and staff.
Guidance Criteria
The assessment utilized various standards and guidance documents, including:
- Health Technical Memorandum 08-01 for clinical environments.
- Defra guidance for animal welfare.
- ASHRAE guidance for vibration limits in laboratories.
- Research on vibration-induced behavioral responses in mice.
Construction Methodologies
Several construction methodologies were evaluated for their noise and vibration impacts including:-
- Vibratory Column Piling (VCP)
- Vibratory Piling
- Percussive Piling
- Rotary/Continuous Flight Augur/Caisson Piling
- Push Piling
- Vibratory Compaction
- Percussive Breaking
Predicted Construction Vibrations
Vibration levels within buildings surrounding the construction works depend on several factors, including construction activity, specific plant used, and ground conditions. Due to uncertainties in initial planning stages, conservative assumptions were used to predict vibrations at receptors using a risk-based approach. Predicted levels were based on BS 5228-2:2009 methodology, with empirical correction factors applied for coupling loss from ground to building footings.
Vibration contours were created to visualize potential impacts on existing buildings, with thresholds based on ASHRAE guidance for human perception and sensitive equipment. Activities like percussive piling and vibratory compaction were predicted to exceed vibration limits for sensitive equipment, indicating these methods are not recommended.
Structure-Borne Vibration
For construction options involving “shell-out” stages, buildings should be isolated where they adjoin to prevent structural connections that could transmit vibration. Best practicable construction methodologies were recommended to minimize vibration emission and transfer, including pre-formed fixing holes, core drilling, and non-impact-based opening techniques.
Predicted Construction Noise Levels
Noise levels for high-impact activities were calculated and presented as noise contours. Predictions were based on worst-case scenarios with all plant located at the perimeter of buildings. Mitigation measures like perimeter hoarding and local screening were recommended to meet noise limits within surrounding buildings. Buildings further from construction works would benefit from additional acoustic screening.
Noise and Vibration Monitoring Options
Continuous monitoring of noise and vibration levels throughout construction is recommended to ensure compliance with agreed limits. This includes baseline monitoring and real-time alerts to guide further mitigation measures if necessary.
Conclusion
The noise and vibration impact assessment provided valuable insights into the potential effects of the redevelopment on the Defra Weybridge Campus. By identifying high-risk activities and recommending suitable construction methodologies and mitigation measures, the assessment aimed to ensure minimal disruption to sensitive receptors and maintain a conducive environment for ongoing research and operations.
This case study highlights the comprehensive approach taken by Anderson Acoustics to address noise and vibration concerns during the redevelopment of a critical research facility.
Project Progress
The Department of Environment Food and Rural Affairs has now named Mace as its programme delivery partner. Masterplans are due to be finalised shortly with most of the building work taking place from 2027 to 2032.
