Salisbury Square
Location: Salisbury Square, City of London, London
Client: City of London
Start Date: October, 2021
End Date: Ongoing
Location: Salisbury Square, City of London, London
Client: City of London
Start Date: October, 2021
End Date: Ongoing
CAPABILITIESCAPABILITIES
- Buildings
- Demolition
- Substructure
- Structural Engineering
- Geotechnics
- Construction Method Engineering
- Temporary Works
- Inspection and Testing
- Buildings
- Demolition
- Substructure
- Structural Engineering
- Geotechnics
- Construction Method Engineering
- Temporary Works
- Inspection and Testing
- Demolition temporary works – floor load assessment and maintenance of structural stability.
- Party wall restraint – tying back the gable of the neighbouring building to the structure behind, avoiding the need for costly and disruptive party wall propping.
- Facade Retention – Preserving the facade of the retained building to enable partial demolition and piling adjacent to the structure.
- Structural alteration – development of the method to deepen the basement and re-frame the retained building, maintaining building stability in parallel with the deep basement excavations surrounding the listed building.
- Retaining wall design – the parameters from the site investigation indicated that three levels of basement propping would be necessary for the excavation. Based on experience enhanced parameters were modelled and the wall monitored to justify less conservative parameters saving on material, cost and programme.
- Basement propping – development of multiple stages of propping to enable piling, capping beam construction and bulk excavation. The scheme allowed the basement to be constructed efficiently and the new core structures to be built without obstruction by the props.
- Demolition temporary works – floor load assessment and maintenance of structural stability.
- Party wall restraint – tying back the gable of the neighbouring building to the structure behind, avoiding the need for costly and disruptive party wall propping.
- Facade Retention – Preserving the facade of the retained building to enable partial demolition and piling adjacent to the structure.
- Structural alteration – development of the method to deepen the basement and re-frame the retained building, maintaining building stability in parallel with the deep basement excavations surrounding the listed building.
- Retaining wall design – the parameters from the site investigation indicated that three levels of basement propping would be necessary for the excavation. Based on experience enhanced parameters were modelled and the wall monitored to justify less conservative parameters saving on material, cost and programme.
- Basement propping – development of multiple stages of propping to enable piling, capping beam construction and bulk excavation. The scheme allowed the basement to be constructed efficiently and the new core structures to be built without obstruction by the props.
- Staged propping had to be coordinated to consider different obstacles during the demolition and construction phases, including coordination with existing and future structures, MOLA excavations, services, and adjacent structures.
- Different capping beam levels resulted in different prop levels, leading to a more complex solution with 20 different perimeter conditions.
- Propping had to be coordinated with other temporary works, such as Tower Crane grillages and Loading Gantries.
- Due to high loads, large sections for the propping were required, which posed logistical challenges. Members had to be divided into smaller sections, resulting in more splice connections.
- Design of retaining walls and propping to maintain the stability of the adjacent listed building whilst it was undermined and new basements formed which in-turn needed to be supported during the main bulk excavation.
- Co-ordinating the complex staging arrangement was overcome using a 4D model built in Tekla to check and avoid unacceptable clashes. This also was used by the wider project team to visualise and plan their activities.
- Staged propping had to be coordinated to consider different obstacles during the demolition and construction phases, including coordination with existing and future structures, MOLA excavations, services, and adjacent structures.
- Different capping beam levels resulted in different prop levels, leading to a more complex solution with 20 different perimeter conditions.
- Propping had to be coordinated with other temporary works, such as Tower Crane grillages and Loading Gantries.
- Due to high loads, large sections for the propping were required, which posed logistical challenges. Members had to be divided into smaller sections, resulting in more splice connections.
- Design of retaining walls and propping to maintain the stability of the adjacent listed building whilst it was undermined and new basements formed which in-turn needed to be supported during the main bulk excavation.
- Co-ordinating the complex staging arrangement was overcome using a 4D model built in Tekla to check and avoid unacceptable clashes. This also was used by the wider project team to visualise and plan their activities.
- Staged propping had to be coordinated to consider different obstacles during the demolition and construction phases, including coordination with existing and future structures, MOLA excavations, services, and adjacent structures.
SummarySummarySalisbury Square is a new purpose-built 18-courtroom legal facility, the City of London Law Courts, and an industry leading City of London police headquarters equipped to combat fraud and economic crime across the UK.
Construction required the demolition of the existing buildings and excavation of a deepened basement across the entire site.Salisbury Square is a new purpose-built 18-courtroom legal facility, the City of London Law Courts, and an industry leading City of London police headquarters equipped to combat fraud and economic crime across the UK.
Construction required the demolition of the existing buildings and excavation of a deepened basement across the entire site.Delivering valueDelivering valueThe construction of Salisbury Square required the construction of a new basement. Wentworth worked with the project team to propose viable piled wall alignments that minimised the extent of existing wall that had to be demolished. At locations this involved moving the retaining wall into the site. Working with the architectural team Wentworth enabled the formation of deeper capping beams to maintain the required internal functional area.
Wentworth carried out the piled wall design and basement propping using the observational method to engineer out a third level of propping for this 18m deep basement. The omission of this propping contributed to significant carbon, cost and programme benefits.The construction of Salisbury Square required the construction of a new basement. Wentworth worked with the project team to propose viable piled wall alignments that minimised the extent of existing wall that had to be demolished. At locations this involved moving the retaining wall into the site. Working with the architectural team Wentworth enabled the formation of deeper capping beams to maintain the required internal functional area.
Wentworth carried out the piled wall design and basement propping using the observational method to engineer out a third level of propping for this 18m deep basement. The omission of this propping contributed to significant carbon, cost and programme benefits.Key scopeKey scopeSalisbury Square is one of the largest and most complex basement excavations in Central London. Our integrated services enabled us to efficiently coordinate a range of key disciplines, while leveraging our technical expertise to promote circular economy best practices. The project involved an 18.5m deep excavation from street level across a site that sloped by 4.5m from one end to the other. It is bounded by adjacent buildings, including a listed building, and highways packed with services.
The key elements of Wentworth’s scope were:Salisbury Square is one of the largest and most complex basement excavations in Central London. Our integrated services enabled us to efficiently coordinate a range of key disciplines, while leveraging our technical expertise to promote circular economy best practices. The project involved an 18.5m deep excavation from street level across a site that sloped by 4.5m from one end to the other. It is bounded by adjacent buildings, including a listed building, and highways packed with services.
The key elements of Wentworth’s scope were:Key Challenges and SolutionsKey Challenges and Solutions - Demolition temporary works – floor load assessment and maintenance of structural stability.
- Buildings