100 Liverpool St, London

Contract Summary

Works involved the lowering of the existing basement to both the North and South buildings. Construction of North Core to a Special finish from basement to 11th floor (13 levels). Construction of 800mm radius column, double height and single height to special finish bottom up pumped with self-compacting concrete, encasing existing 500mm square concrete encasement to steel columns.

Basement works include, hydraulic jacking to structure to lower pilecap, demolition of existing basement slab and excavation, sheet pilings, mini piling to new pilecaps, drainage. Concrete to slab, pits, beams, shear walls.

North Core special finish to all internal walls to Architects requirements where bolthole positions and board layouts are defined and change to suit various floor heights. Poured with self-compacting concrete, utilising a Peri Jump system faced with a special plywood.

800mm radius column special finish as set out by Architects. The existing retained structure has 500mm square concrete encasement to steel columns which require 800mm radius special finish concrete to be constructed around existing.  There are both single and double height columns where the double height columns are +8m high and require bottom up pumping with self-compacting concrete utilising a number of bespoke metal moulds to suit each condition. The same applies to the single height columns where self-compacting concrete is bottom up pumped utilising a number of bespoke metal moulds to suit each condition.

Realtime summary of work scope:

• Lowering of existing basement to the north and south buildings.
• Casting visual concrete trail panels for design team and client approval.
• Forming a new 800mm diameter circular columns in a special finish.
• Due to the height of these elements Realtime employed a self-compacting concrete and bottom pumped to ensure the high-quality finish.
• Bespoke metal column formers manufactured to achieve the visual finish required with pumping hatches incorporated.
• Encasement of structural steel columns with a 500mm square concrete column.
• Hydraulic jacking system of existing structure to allow the existing basement slab to be demolished and excavated to new formation level.
• Sheet piling and mini piling to the basement levels.
• Formation of new reinforced concrete pile caps, beams, and basement slab.
• Vertical elements including shear walls and columns.
• Forming a new reinforced visual concrete lift/stair core from basement level to level 11. The special concrete finish required architect agreement and all board layouts and bolt holes. Self-compacting concrete was used to ensure compaction was achieved whilst using special plywood to achieve the desired finish. Realtime used a Peri Jump system to access and construct the core walls.

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