8 Bishopsgate
Location: City of London, London
Client: Keltbray / Lend Lease / Stanhope
Location: City of London, London
Client: Keltbray / Lend Lease / Stanhope
CapabilitiesCapabilities
- Buildings
- Substructure
- Demolition
- Structural Engineering
- Construction Method Engineering
- Temporary Works
- Buildings
- Substructure
- Demolition
- Structural Engineering
- Construction Method Engineering
- Temporary Works
SummarySummary
8 Bishopsgate is a new Landmark 50-storey tower on the corner of Bishopsgate and Leadenhall Street. This EPC A-rated building is designed and built with sustainability front and centre and is currently the tallest commercial building in the UK to achieve BREEAM Outstanding.
Wentworth’ scope at 8 Bishopsgate started with the demolition of the existing Deutsche Bank building at the corner of Leadenhall and Bishopsgate and continued to the extensive basement substructure and the design and construction of the new cores.
Wentworth’ scope at 8 Bishopsgate started with the demolition of the existing Deutsche Bank building at the corner of Leadenhall and Bishopsgate and continued to the extensive basement substructure and the design and construction of the new cores.
8 Bishopsgate is a new Landmark 50-storey tower on the corner of Bishopsgate and Leadenhall Street. This EPC A-rated building is designed and built with sustainability front and centre and is currently the tallest commercial building in the UK to achieve BREEAM Outstanding.
Wentworth’ scope at 8 Bishopsgate started with the demolition of the existing Deutsche Bank building at the corner of Leadenhall and Bishopsgate and continued to the extensive basement substructure and the design and construction of the new cores.
Wentworth’ scope at 8 Bishopsgate started with the demolition of the existing Deutsche Bank building at the corner of Leadenhall and Bishopsgate and continued to the extensive basement substructure and the design and construction of the new cores.
DELIVERING VALUEDELIVERING VALUE
One of the initial challenges was enabling the core construction to get released and built in a way that allowed the steel frame to follow. In the original scheme the challenge was to get the core high enough that the steel frame wouldn’t catch the concrete work. In the event the real value came through our work to prove how high we could take the core ahead of the steel frame as the cycle times for the core construction came down from original plan and those for the steel frame went up!
Wentworth also delivered value through developing a craneage and hoist strategy with minimal changes to the permanent works.
Wentworth also delivered value through developing a craneage and hoist strategy with minimal changes to the permanent works.
One of the initial challenges was enabling the core construction to get released and built in a way that allowed the steel frame to follow. In the original scheme the challenge was to get the core high enough that the steel frame wouldn’t catch the concrete work. In the event the real value came through our work to prove how high we could take the core ahead of the steel frame as the cycle times for the core construction came down from original plan and those for the steel frame went up!
Wentworth also delivered value through developing a craneage and hoist strategy with minimal changes to the permanent works.
Wentworth also delivered value through developing a craneage and hoist strategy with minimal changes to the permanent works.
Key scopeKey scope
- Structural Assessment: Review of the stability of the cores with varying conditions of steel frame. The core is very slender in the north south direction and this means that the temporary condition was critical. This led to additional rebar in the core walls to allow the core to progress at its own pace and not be slowed by the steel frame construction.
- Temporary Works: Primarily the work associated with the tower cranes and hoists and how to allow these to climb as the core progressed.
- New Structural Elements: Co-ordination and detail checks for the embedded plates for the steel frame and also for the temporary condition. The detailing around the embedded plates in the cores was complex and we addressed critical details with staged 3D models looking at the temporary state and stability of the plates whilst we fixed the rebar around them.
- Construction Sequencing: creation of a detailed construction sequence to minimise disruption and ensure the structural integrity of the building. There was a key interface between the two cores and how high the upper
- Structural Assessment: Review of the stability of the cores with varying conditions of steel frame. The core is very slender in the north south direction and this means that the temporary condition was critical. This led to additional rebar in the core walls to allow the core to progress at its own pace and not be slowed by the steel frame construction.
- Temporary Works: Primarily the work associated with the tower cranes and hoists and how to allow these to climb as the core progressed.
- New Structural Elements: Co-ordination and detail checks for the embedded plates for the steel frame and also for the temporary condition. The detailing around the embedded plates in the cores was complex and we addressed critical details with staged 3D models looking at the temporary state and stability of the plates whilst we fixed the rebar around them.
- Construction Sequencing: creation of a detailed construction sequence to minimise disruption and ensure the structural integrity of the building. There was a key interface between the two cores and how high the upper
Key Challenges and SolutionsKey Challenges and Solutions
- The support of the tower cranes on climbing beams, pockets and restraint beams. Movement limits around the jump form rig were critical and we developed a novel solution that minimised loads at the top of the core.
- The design of a hoist tower that could be re-supported high above the foundation to allow the removal of the lower mast to enable the lift shaft works to start earlier.
- Detailed FE work on the core to examine the temporary condition linked back to the basic wind study to determine safe climbing levels for the core relative to the steel frame.
- The support of the tower cranes on climbing beams, pockets and restraint beams. Movement limits around the jump form rig were critical and we developed a novel solution that minimised loads at the top of the core.
- The design of a hoist tower that could be re-supported high above the foundation to allow the removal of the lower mast to enable the lift shaft works to start earlier.
- Detailed FE work on the core to examine the temporary condition linked back to the basic wind study to determine safe climbing levels for the core relative to the steel frame.