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You are: Home Case studies Comet square

jnpgroup consulting engineers services provided:

• Geo-enviromental assessment
• Road & car park design
• Drainage design
• Foundation design
• SUD's design
• Structural design
• Post tensional slab design

Comet square

Comet Square, Hatfield - Phases 1 and 2

jnpgroup provided a comprehensive 'one stop' engineering design service on this major residential development on the former British Aerospace site in Hatfield.

Pre-purchase services included:

• Geo-environmental audit of the vendor’s reports
  

Post-purchase services included the design of:

• Access roads & car parks
• Foul & surface water drainage
• Piled foundations
• Reinforced concrete sub-structures
• Post tensioned concrete transfer slabs
• Load-bearing masonry superstructures

Working with the client and the project architect (Powell Dobson) a number of economies were identified at an early stage. This included the use of post-tensioned in-situ reinforced concrete transfer slabs at first floor level, which resulted in considerable savings in reinforcement tonnages.

Thames Water had set stringent surface water drainage discharge rate restrictions. However following negotiations with the Environment Agency soak-aways were utilised.

Phase 1 - four 4 & 5 storey blocks of flats comprising pre-cast concrete floors spanning onto load bearing masonry walls built off post-tensioned flat transfer slabs over under-croft car parking.

Comet Square Phase 1

Phase 2 - four 3 & 4 storey blocks of flats comprising pre-cast concrete floors spanning onto load bearing masonry walls built off post-tensioned flat transfer slabs over under-croft car parking, a private gym and several retail units.

Foundations comprised approximately 2200 no. Continuous Flight Auger (CFA) piles ranging from 300 to 450mm diameter, supporting reinforced concrete pile caps and ground beams.

‘Disproportionate collapse’ design allowed for local loss of vertical support by the provision of horizontal ties at upper levels, and accidental damage (debris) loading on the transfer slabs.

The project benefits from an on-site centralised sustainable ‘Combined Heat and Power’ (CHP) unit. The CHP structure comprises a light weight steel frame with mezzanine floor on in-situ reinforced concrete slabs and ground beams on CFA piles.

Comet Square Phase 2

Client: Barratt North London

Approx Value: £60m

Residential:	Phase 1: 200 units
	Phase 2: 267 units

Commercial: 44,545 sq ft of A2 & A3

Phase 1: Completed Summer 2006

Phase 2: Commenced on site February 2006