LIFT SLABS SPEED HEATHROW CAR PARK

Unbonded, prestressed lift-slabs are being used to construct a 1204 vehicle capacity car park. The main advantage of the method is its speed of concreting permitting the construction to be completed in 39 weeks. High productivity is possible by the sparsity of reinforcement in the stressed slab. The structure is divided into eight independent areas each involving 20 columns. This division allows overlapping of the successive activities. The first floor slab surface was treated with a debonding agent before casting the second floor slab directly on top. Fifty per cent post-tensioning is applied when the concrete strength reaches 12.5 n/mm2 to control crack formation. The full stressing is applied before lifting using unbonded tendons and anchorages. Automatically-synchronised jacks are used to raise the slabs. The sections are then joined together with 1 M wide in-situ concrete strips. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00107859
• Corporate Authors:

  IPC Building and Contract Journals Limited

  Surrey House, 1 Throwley Way
  Sutton, Surrey SM1 4QQ,   England 
• Publication Date: 1981-5-21

Media Info

• Features: Photos;
• Pagination: p. 22-23
• Serial:
  • CONTRACT JOURNAL
  • Volume: 301
  • Issue Number: 5301
  • Publisher: Reed Business Information, Limited
  • ISSN: 0010-7859

Subject/Index Terms

• TRT Terms: Airports; Anchorages; Bridge decks; Cast in place concrete; Concrete; Concrete structures; Construction equipment; Construction management; Cracking; Floors; Jacks (Mechanical equipment); Multistory structures; Parking garages; Posttensioning; Prestressed concrete; Reinforced concrete; Slabs; Strength of materials; Stresses; Tendons
• Uncontrolled Terms: Stressing
• Geographic Terms: United Kingdom
• Old TRIS Terms: Lift slab construction
• ITRD Terms: 1037: Airport; 3420: Anchorage; 4781: Cast in situ concrete; 5211: Cracking; 3831: Jack; 924: Multi storey parking garage; 4789: Post tensioning; 4796: Prestressed concrete; 3491: Slab; 5544: Strength (mater); 8119: United Kingdom
• Subject Areas: Aviation; Bridges and other structures; Construction; Highways; Materials; Planning and Forecasting; Terminals and Facilities; I32: Concrete; I50: Construction and Supervision of Construction; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00341907
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Dec 22 1981 12:00AM