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40 Leadenhall Street is one of the biggest schemes to have ever received planning permission in the City of London. Reminiscent of the classic North American skyscrapers of the early 20th century, the building’s stepped design cascades down towards the River Thames, somewhat resembling Batman’s Gotham City.
The sheer scale of this iconic project presented unique challenges. We were appointed to deliver a three-level basement with complex shoring props for partial top down and traditional “blue sky” construction. The superstructure was a steel frame with composite slabs around two large cores, rising to levels 37 and 17.
Structures
A Complex Substructure
02
Detailed planning, professional execution and conscientious monitoring resulted in the safe and successful delivery of the permanent works’ excavation, propping and construction. The construction of the three-storey R.C. waterproof basement took place across four fronts.
“Blue sky” excavations were executed in the north and south cofferdams. The general basement in the northern half of the project was built in a top down manner while the southern half was built traditionally using “blue sky” methods. Twin level permanent along with temporary R.C. gantry slabs and excavator platforms to the north, east, and south elevations were connected using a suspended R.C. haul road supported on plunge columns.
Core Safety
03
Like many of the City’s new landmark office buildings, the north core of 40 Leadenhall was designed to service vast space requirements, acting as both the backbone and central nervous system for the northern portion of the structure. It also housed 16 lifts, two escape stairs and five service risers.
The core construction required us to commission one of Doka’s largest and most efficient jumpforms yet. Of utmost importance was the provision of safe and secure working areas for operational personnel and visitors. The rig was also designed to facilitate the advanced installations of lift cars, structural steel, facade elements and permanent steel stairs.
Structural Performance
04
The 37-storey north core was founded on a 2.5 m deep, 1,500 m³ waterproof reinforced concrete pile cap – one of the project’s most critical structural elements. Before casting, careful technical consideration was given to the early age thermal behaviour of this exceptionally deep element. We specified seasonally sensitive concrete mixes and bespoke reinforcing and carried out a thermal monitoring regime to ensure its structural performance.
This meticulous preparation meant the foundation was cast in a single, uninterrupted operation. The 1,500 m³ of concrete was successfully delivered using five carefully located mobile concrete pumps over a period of six-and-a-half hours. The similarly sized south core pile cap used a comparable approach.
Low Carbon Construction
05
As part of our strategic commitment to low carbon construction methodology and the elimination of diesel operated plant, we invested in the latest low carbon technology from Schwing to place all of the concrete, successfully climbing two electric placing booms ahead of the build and supplying them using fully electric static concrete pumps.
06
click to open
Core Safety
03
Like many of the City’s new landmark office buildings, the north core of 40 Leadenhall was designed to service vast space requirements, acting as both the backbone and central nervous system for the northern portion of the structure. It also housed 16 lifts, two escape stairs and five service risers.
The core construction required us to commission one of Doka’s largest and most efficient jumpforms yet. Of utmost importance was the provision of safe and secure working areas for operational personnel and visitors. The rig was also designed to facilitate the advanced installations of lift cars, structural steel, facade elements and permanent steel stairs.
Structural Performance
04
The 37-storey north core was founded on a 2.5 m deep, 1,500 m³ waterproof reinforced concrete pile cap – one of the project’s most critical structural elements. Before casting, careful technical consideration was given to the early age thermal behaviour of this exceptionally deep element. We specified seasonally sensitive concrete mixes and bespoke reinforcing and carried out a thermal monitoring regime to ensure its structural performance.
This meticulous preparation meant the foundation was cast in a single, uninterrupted operation. The 1,500 m³ of concrete was successfully delivered using five carefully located mobile concrete pumps over a period of six-and-a-half hours. The similarly sized south core pile cap used a comparable approach.
Low Carbon Construction
05
As part of our strategic commitment to low carbon construction methodology and the elimination of diesel operated plant, we invested in the latest low carbon technology from Schwing to place all of the concrete, successfully climbing two electric placing booms ahead of the build and supplying them using fully electric static concrete pumps.
06
07
07
click to open
Core Safety
03
Like many of the City’s new landmark office buildings, the north core of 40 Leadenhall was designed to service vast space requirements, acting as both the backbone and central nervous system for the northern portion of the structure. It also housed 16 lifts, two escape stairs and five service risers.
The core construction required us to commission one of Doka’s largest and most efficient jumpforms yet. Of utmost importance was the provision of safe and secure working areas for operational personnel and visitors. The rig was also designed to facilitate the advanced installations of lift cars, structural steel, facade elements and permanent steel stairs.
Structural Performance
04
The 37-storey north core was founded on a 2.5 m deep, 1,500 m³ waterproof reinforced concrete pile cap – one of the project’s most critical structural elements. Before casting, careful technical consideration was given to the early age thermal behaviour of this exceptionally deep element. We specified seasonally sensitive concrete mixes and bespoke reinforcing and carried out a thermal monitoring regime to ensure its structural performance.
This meticulous preparation meant the foundation was cast in a single, uninterrupted operation. The 1,500 m³ of concrete was successfully delivered using five carefully located mobile concrete pumps over a period of six-and-a-half hours. The similarly sized south core pile cap used a comparable approach.
Low Carbon Construction
05
As part of our strategic commitment to low carbon construction methodology and the elimination of diesel operated plant, we invested in the latest low carbon technology from Schwing to place all of the concrete, successfully climbing two electric placing booms ahead of the build and supplying them using fully electric static concrete pumps.
06
07
08
06
06
click to open
Core Safety
03
Like many of the City’s new landmark office buildings, the north core of 40 Leadenhall was designed to service vast space requirements, acting as both the backbone and central nervous system for the northern portion of the structure. It also housed 16 lifts, two escape stairs and five service risers.
The core construction required us to commission one of Doka’s largest and most efficient jumpforms yet. Of utmost importance was the provision of safe and secure working areas for operational personnel and visitors. The rig was also designed to facilitate the advanced installations of lift cars, structural steel, facade elements and permanent steel stairs.
Structural Performance
04
The 37-storey north core was founded on a 2.5 m deep, 1,500 m³ waterproof reinforced concrete pile cap – one of the project’s most critical structural elements. Before casting, careful technical consideration was given to the early age thermal behaviour of this exceptionally deep element. We specified seasonally sensitive concrete mixes and bespoke reinforcing and carried out a thermal monitoring regime to ensure its structural performance.
This meticulous preparation meant the foundation was cast in a single, uninterrupted operation. The 1,500 m³ of concrete was successfully delivered using five carefully located mobile concrete pumps over a period of six-and-a-half hours. The similarly sized south core pile cap used a comparable approach.
Low Carbon Construction
05
As part of our strategic commitment to low carbon construction methodology and the elimination of diesel operated plant, we invested in the latest low carbon technology from Schwing to place all of the concrete, successfully climbing two electric placing booms ahead of the build and supplying them using fully electric static concrete pumps.
06
07
08
09
10
Core Safety
03
Like many of the City’s new landmark office buildings, the north core of 40 Leadenhall was designed to service vast space requirements, acting as both the backbone and central nervous system for the northern portion of the structure. It also housed 16 lifts, two escape stairs and five service risers.
The core construction required us to commission one of Doka’s largest and most efficient jumpforms yet. Of utmost importance was the provision of safe and secure working areas for operational personnel and visitors. The rig was also designed to facilitate the advanced installations of lift cars, structural steel, facade elements and permanent steel stairs.
Structural Performance
04
The 37-storey north core was founded on a 2.5 m deep, 1,500 m³ waterproof reinforced concrete pile cap – one of the project’s most critical structural elements. Before casting, careful technical consideration was given to the early age thermal behaviour of this exceptionally deep element. We specified seasonally sensitive concrete mixes and bespoke reinforcing and carried out a thermal monitoring regime to ensure its structural performance.
This meticulous preparation meant the foundation was cast in a single, uninterrupted operation. The 1,500 m³ of concrete was successfully delivered using five carefully located mobile concrete pumps over a period of six-and-a-half hours. The similarly sized south core pile cap used a comparable approach.
Low Carbon Construction
05
As part of our strategic commitment to low carbon construction methodology and the elimination of diesel operated plant, we invested in the latest low carbon technology from Schwing to place all of the concrete, successfully climbing two electric placing booms ahead of the build and supplying them using fully electric static concrete pumps.
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