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CSMANLTD Underpinning and Basement Construction London

CSMANLTD expertise in underpinning and basement construction London has enabled us to successfully complete a wide range of challenging projects across London. Our case studies demonstrate our ability to deliver complex, high-quality solutions that enhance the stability, functionality, and value of properties. Below are some of our standout projects in underpinning and basement construction, highlighting our commitment to excellence, innovation, and client satisfaction.

Residential Basement Extension in Fulham

Project Overview: A homeowner in Fulham wanted to extend their living space by adding a basement level to their Victorian terraced house. The project required careful planning and execution to ensure the stability of the existing structure while maximizing the new space’s utility and aesthetics.

Challenges:

  • Working within the tight confines of an existing structure.
  • Ensuring the stability of the neighboring properties during excavation and construction.
  • Integrating modern amenities and design elements in a historically significant building.

Solutions:

  • Precision Underpinning: Our team used a phased underpinning approach to stabilize the existing foundation before beginning the excavation. This method ensured the safety and stability of the structure throughout the project.
  • Advanced Excavation Techniques: Utilizing state-of-the-art machinery and careful planning, we minimized disruption and efficiently excavated the new basement space.
  • Customized Design: Collaborating with the homeowner, we designed a basement that included a home theater, gym, and additional living areas, blending modern design with the home’s historical character.

Outcome: The project was completed on time and within budget, resulting in a beautifully integrated basement extension that significantly enhanced the living space and value of the property. The homeowner was delighted with the transformation, praising the seamless integration and high-quality finish.

Commercial Basement Construction in Soho

Project Overview: A commercial property in Soho required additional space for a new restaurant and bar. The client wanted to construct a basement level that would house the kitchen, storage, and additional seating, all while maintaining the building’s structural integrity and minimizing disruption to the busy area.

Challenges:

  • Excavating and constructing a basement in a densely populated, high-traffic urban area.
  • Ensuring minimal disruption to neighboring businesses and pedestrians.
  • Meeting stringent health and safety regulations for a commercial kitchen and public space.

Solutions:

  • Innovative Underpinning: We employed advanced underpinning techniques to support the existing structure while excavating the new basement. This ensured the building’s stability and minimized risk.
  • Efficient Project Management: Careful planning and scheduling allowed us to work efficiently, coordinating with local authorities and stakeholders to minimize disruption and maintain safety.
  • Compliance and Quality: Our team ensured that all aspects of the basement construction met health and safety standards, providing a safe and functional space for the new restaurant and bar.

Outcome: The new basement was successfully integrated into the commercial property, providing the client with a spacious, functional area for their restaurant and bar. The project was completed with minimal disruption to the surrounding area, and the new establishment quickly became a popular spot in Soho.

Underpinning and Basement Conversion in Hampstead

Project Overview: A family home in Hampstead required underpinning and a basement conversion to create additional living space and address foundation issues. The project involved stabilizing the existing structure and converting the damp, unused basement into a habitable area.

Challenges:

  • Addressing existing foundation issues and ensuring long-term stability.
  • Waterproofing the basement to create a dry, comfortable living space.
  • Maintaining the aesthetic and structural integrity of the property.

Solutions:

  • Comprehensive Underpinning: Our team conducted a thorough assessment of the foundation issues and used advanced underpinning techniques to stabilize and strengthen the structure.
  • Effective Waterproofing: We implemented a comprehensive waterproofing system, including tanking and drainage, to ensure the new basement space was dry and habitable.
  • Quality Finishes: The basement conversion included the creation of a new living room, bedroom, and bathroom, all finished to a high standard to match the rest of the home.

Outcome: The underpinning and basement conversion project was a success, providing the family with additional, high-quality living space and ensuring the long-term stability of their home. The new basement area is dry, comfortable, and seamlessly integrated with the rest of the property.

Large-Scale Underpinning Project in Kensington

Project Overview: A large, multi-story building in Kensington required significant underpinning work to address subsidence issues and ensure the structure’s stability. The project involved extensive planning and execution to stabilize the foundation and prevent further movement.

Challenges:

  • Addressing severe subsidence and ensuring the building’s stability.
  • Coordinating a large-scale project in a densely populated urban area.
  • Minimizing disruption to residents and nearby properties.

Solutions:

  • Detailed Assessment and Planning: Our engineers conducted a thorough assessment of the subsidence issues and developed a comprehensive underpinning plan tailored to the building’s specific needs.
  • Phased Underpinning Approach: We used a phased approach to underpin the foundation, working systematically to stabilize the structure while minimizing disruption.
  • Ongoing Monitoring: Throughout the project, we monitored the building for any signs of movement, ensuring that the underpinning work was effective and the structure remained stable.

Outcome: The large-scale underpinning project was completed successfully, stabilizing the building and preventing further subsidence. The project was managed efficiently, with minimal disruption to residents and neighboring properties. The building is now secure, with a stable foundation that ensures its longevity.

Conclusion

CSMANLTD’s expertise in underpinning and basement construction has enabled us to deliver outstanding results across a range of challenging projects. Our commitment to quality, innovation, and client satisfaction is evident in every project we undertake. Contact us today to learn how our underpinning and basement construction services can enhance the stability and value of your property.

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Innovation Showcase | Track-free travelling formwork drives pace of HS2 green tunnel work

Innovative moving formwork is helping to speed construction of High Speed 2’s Copthall Tunnel in north west London.

Copthall Tunnel is one of five green tunnels being built along Phase 1 of High Speed 2 (HS2) between London and Birmingham.

Situated between HS2’s Northolt Tunnel and the Colne Valley Viaduct, the 880m long reinforced concrete Copthall Tunnel will blend into
its natural surroundings, covered with trees and plants once construction is complete.

The project is being delivered by Skanska Costain Strabag Joint Venture, with Kilnbridge appointed to complete the reinforced concrete works. Making the tunnel a concrete reality has been possible with custom formwork travellers engineered by Peri’s specialist infrastructure team.

As the travellers were expected to be in use over an 18 month period, the main drivers influencing their design were durability, productivity and sustainability.

To support the specified construction sequence, Peri’s engineers designed two carriages which enabled the site team to cast the walls and roof slab simultaneously, ultimately accelerating the programme. These carriages comprised four units in total, two for the wall and two for the roof.

The carriages are designed to reduce material, manual labour and craneage as the main operations such as striking, positioning and travelling are completed hydraulically.

The wall forms are built from special modular steel panels. Each set is designed to build 20m long and 7.5m high walls.

The panels are suspended from a carriage which is designed using off-the-shelf components from Peri’s Variokit range, with some specially fabricated connection parts. Variokit rails provided additional support for the formwork, reducing through ties to less than half the quantity required in a traditional panel system.

“We’ve been able to save around five days per wall in comparison to traditional formwork systems, as we can complete installation and prepare the system for concreting in one day,” says Kilnbridge project manager Teresa Martin.

The internal and external formwork on the wall carriages raise, lower and retract hydraulically, eliminating crane use and reducing labour requirements and cycle time by over 80%.

The roof carriage is built from a mix of special and standard components. In addition to fully supporting the rebar and concrete load, it features hydraulic cylinders which enable the traveller to be lowered, collapsed, pushed under the carriage in front and repositioned to allow rebar fixing and pouring operations to be concurrent. 

Peri senior sales engineer Dan Biggs says: “Special steel formwork was ideal for this project as the forms can be reused up to 30 times, so there is an obvious material saving advantage in addition to time savings, as panels do not need refacing, unlike a
plywood faced system.”

Following on from the installation of the roof traveller, the next steps will be progressing the tunnel so all three elements – base slab, tunnel walls and roof slab progress concurrently without conflicting. Tunnel construction is expected to be completed by February 2025. 

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