Hydro Demolition in Wastewater Management
In wastewater management, maintaining structural integrity is crucial for ensuring the safety and longevity of infrastructure. This project in Dorset highlighted Total Specialist Maintenance’s (TSM) expertise in hydro demolition for a water company, addressing critical challenges posed by deteriorating concrete.
The Challenge
The structure required the removal of the top 150mm of concrete from the walls for several reasons:
- Insufficient Cover Over Reinforcement: The existing concrete cover was inadequate, exposing the reinforcement to potential corrosion and compromising the structural integrity of the tank.
- Incorrect Levels for New Tank Roof: The levels of the existing concrete did not align with the requirements for the new tank roof, necessitating precise adjustments.
- Deterioration from Hydrogen Sulfide Attack: The concrete had suffered significant deterioration due to hydrogen sulfide exposure, leading to further risks of structural failure if not addressed promptly.
The Solution
To tackle these challenges, TSM implemented a hydro demolition strategy, utilising directly employed operatives trained specifically for this technique. The process involved several critical steps:
- Removing the Top 150mm of Concrete: TSM carefully demolished the upper section of the structure walls using hydro demolition equipment. This method allowed for the precise removal of the deteriorated concrete while preserving the integrity of the remaining structure. The controlled nature of hydro demolition minimised the risk of damaging the underlying reinforcement or adjacent areas.
- Water Management: Throughout the hydro demolition process, TSM implemented effective water management strategies to control the flow and minimise environmental impact. This included using water recycling systems to ensure that excess water was properly managed and treated.
- Dust and Noise Control: TSM took measures to mitigate dust and noise during the demolition process, ensuring compliance with local regulations and maintaining a safe working environment for all personnel.
- Quality Assurance: The team performed regular inspections during the demolition process to ensure that the work met industry standards and client specifications. Feedback loops were established to address any issues in real-time.
- Preparation for Repairs: Once the top 150mm of concrete was removed, the team prepared the surface for necessary repairs and modifications. This included cleaning the exposed reinforcement and assessing any further deterioration that needed attention before the new tank roof could be installed.
Project Management Excellence
TSM’s project management team effectively coordinated all aspects of the hydro demolition process, ensuring that the work was completed efficiently and within the specified timeline. Their commitment to quality control, safety protocols, and environmental stewardship played a significant role in the successful execution of this project.
Environmental Considerations
Throughout the project, TSM prioritised environmentally friendly practices. The hydro demolition method itself is less invasive compared to traditional demolition techniques, resulting in reduced waste and lower environmental impact. Additionally, the use of water recycling systems ensured minimal disruption to the surrounding area.
