Floor Depths – CCP Hollow Core Floor Planks are manufactured in 100mm and 150mm solid, 150mm, 200mm, 250mm and 300mm hollow core options.
Typical Sections – Below are diagrams illustrating typical sections for Hollow Core and Solid Slab options:
150mm Hollow Core
200mm Hollow Core
250mm Hollow Core
300mm Hollow Core
Enhanced Structural Performance – The use of high strength concrete combined with prestressing steel tendons offer far greater span to depth ratios than traditional flooring systems. As Quicklay Hollow Core Floor Planks are wet cast, the restrictions on wire patterns associated with extruded and slip formed methods of production with open cores are removed. Thus, span to depth ratios can be further enhanced with additional prestressing tendons.
Camber – All prestressed concrete units have a camber. The degree of camber is dependent on a variety of factors and CCP Quicklay Hollow Core Floor Planks are designed to have a camber of no greater than L/300. Variations in camber will be within the tolerances specified in BS81110, except where adjacent planks are spanning different lengths, or where there are large openings cast in. Consideration should be given to camber when selecting floor finishes.
Grouting – The joints between units will require grouting in with a minimum of C30 grade concrete with a maximum aggregate size of 10mm. Once the floor planks have been structurally grouted in, the floor will provide a diaphragm action for the structure.
Working Platform – Once the planks have been placed and grouted, an immediate working platform is created for follow-on trades. In most cases, propping is not required and so the area below the floor remains free from congestion allowing other trades to progress unhindered.
Progressive Collapse – Preformed slots can be cast in planks during manufacture for progressive collapse. For structures with five stories or more, CCP can supply and detail a “Demidec” solution with floor planks spanning continuously to act as a “strong” floor.
Installation – CCP can provide a suitably trained and qualified installation team to carry out the erection of the floors (and stairs, if required). Full site specific method statements, lift plans and risk assessments will be provided. Any overhead obstructions or suitable hard standing for a crane will be discussed with the site team prior to any installation work commencing and these requirements will form part of the method statement.
Design – Design work is carried out by CCP’s in house design team.
Drawings and Software – Once an order has been placed, CCP will issue layout drawings for the works to be carried out. These drawings show the supporting structure for the precast units, position of service holes, details of loading and floor finishes and typical sections through the floor. These drawings will be issued to all parties for approval. Manufacturing, loading and erection sequencing is carried out using the latest state of the art software to ensure that the transition from concept to outcome is as seamless as possible.
Composite Slab – Hollow Core Floor Units can be designed to act compositely with an insitu concrete topping.