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Designed by the world-renowned Skidmore Owings & Merrill (SOM), this striking 36-storey canalside development is Islington’s tallest building.
Part of the City Road Basin Masterplan, the Lexicon provides 307 apartments including a private residents’ spa and lounge, 785 m² of mixed-use commercial space and 52 basement car parking spaces.
We were appointed to deliver the substructure and superstructure for this landmark building. We also managed the piling subcontract for the bearing and perimeter piles and the installation of the groundwater heating system.
Structures
Substructure
02
Substructure works included the construction of a new, single level, waterproof basement car park and swimming pool and spa facility. Challenges were presented both by the site’s small footprint as well as its location on a former historic foundry with massive concrete obstructions below the basement. Great care was required during the demolition of the existing basement space.
Superstructure
03
The 36-storey lift and stair core was constructed using a slipform rig due to the compact floorplates. Hydraulic protection screens were used to construct the ring of perimeter columns and the parallelogram-shaped floor plates.
Productivity
04
Floorplate slabs were constructed in two parts: one half cast to allow shuttering for the columns and walls to be erected, while the other half saw the floorplate falsework and reinforcement installed prior to casting. The concrete had to achieve a fast setting rate to achieve the desired early age strength and changes were made to the mix design to enable the supporting floors to carry the next slab being cast on the accelerated programme. This method meant the floors were cast at a rate of one every six days, allowing the programme to be completed several weeks ahead of schedule.
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click to open
Superstructure
03
The 36-storey lift and stair core was constructed using a slipform rig due to the compact floorplates. Hydraulic protection screens were used to construct the ring of perimeter columns and the parallelogram-shaped floor plates.
Productivity
04
Floorplate slabs were constructed in two parts: one half cast to allow shuttering for the columns and walls to be erected, while the other half saw the floorplate falsework and reinforcement installed prior to casting. The concrete had to achieve a fast setting rate to achieve the desired early age strength and changes were made to the mix design to enable the supporting floors to carry the next slab being cast on the accelerated programme. This method meant the floors were cast at a rate of one every six days, allowing the programme to be completed several weeks ahead of schedule.
05
06
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07
click to open
Superstructure
03
The 36-storey lift and stair core was constructed using a slipform rig due to the compact floorplates. Hydraulic protection screens were used to construct the ring of perimeter columns and the parallelogram-shaped floor plates.
Productivity
04
Floorplate slabs were constructed in two parts: one half cast to allow shuttering for the columns and walls to be erected, while the other half saw the floorplate falsework and reinforcement installed prior to casting. The concrete had to achieve a fast setting rate to achieve the desired early age strength and changes were made to the mix design to enable the supporting floors to carry the next slab being cast on the accelerated programme. This method meant the floors were cast at a rate of one every six days, allowing the programme to be completed several weeks ahead of schedule.
05
06
07
08
06
06
click to open
Superstructure
03
The 36-storey lift and stair core was constructed using a slipform rig due to the compact floorplates. Hydraulic protection screens were used to construct the ring of perimeter columns and the parallelogram-shaped floor plates.
Productivity
04
Floorplate slabs were constructed in two parts: one half cast to allow shuttering for the columns and walls to be erected, while the other half saw the floorplate falsework and reinforcement installed prior to casting. The concrete had to achieve a fast setting rate to achieve the desired early age strength and changes were made to the mix design to enable the supporting floors to carry the next slab being cast on the accelerated programme. This method meant the floors were cast at a rate of one every six days, allowing the programme to be completed several weeks ahead of schedule.
05
06
07
08
09
10
Superstructure
03
The 36-storey lift and stair core was constructed using a slipform rig due to the compact floorplates. Hydraulic protection screens were used to construct the ring of perimeter columns and the parallelogram-shaped floor plates.
Productivity
04
Floorplate slabs were constructed in two parts: one half cast to allow shuttering for the columns and walls to be erected, while the other half saw the floorplate falsework and reinforcement installed prior to casting. The concrete had to achieve a fast setting rate to achieve the desired early age strength and changes were made to the mix design to enable the supporting floors to carry the next slab being cast on the accelerated programme. This method meant the floors were cast at a rate of one every six days, allowing the programme to be completed several weeks ahead of schedule.
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