In office buildings, more than half of the technical equipment and room arrangement are frequently changed.
These buildings require a functional solution for the way the installations are run, and the answer to this is to create free space under the floor thanks to the so-called. raised floors.
Two distinctive floor systems, often used in a mixed system, are poured raised floors and modular raised floors.
Poured raised floors
In cast-in-place raised floors, gypsum-cardboard panels are the formwork system element.
Poured raised floors, is a combination of plasterboards with a self-leveling floor based on anhydrite.
Layout of layers of poured raised floor:
• Support elements – Galvanized steel feet, height. 25-400 mm in axial spacing 600 mm or aerated concrete elements with a base size of 50×50 mm and height 30-100 mm.
• Formwork board – Drywall 10 mm, with increased compressive strength 6 MPa.
• Damping layer – Styrofoam board 10 mm or damping foam mat 5 mm.
• Separating layer – Polyethylene film 0,2 mm.
• Supporting plate – Screed board made of self-levelling anhydrite mass, min. 35 mm.
Advantages of a cast-in-place raised floor:
• High resistance to static and dynamic loads.
• High structural stiffness, virtually zero deflection (f = 0,2 mm).
• Minimal linear shrinkage (0,1 mm/m) and thermal – surfaces up to 800 m2 without shrinkage expansion joints.
• Possibility of mounting any partition wall structure directly on the floor surface with high-quality surface evenness.
• Non-flammable construction materials, fire resistance of the floor – F90, smoke tightness of the floor.
• Free space under the entire floor surface for installation – access to the installation on the floor is provided through freely arranged installation boxes and inspection channels covered with raised modular floor panels.
• Good acoustic properties – attenuation of airborne and material sounds by a massive, a continuous support plate on a flexible damping layer.
• Can be easily combined with other floor systems.
Modular raised floors
Modular raised floors are used everywhere, where there is a need for cabling rooms and workstations – especially, when direct access to the underfloor space is required over the entire floor area.
The raised modular floor consists of slabs 60 x 60 cm based on the posts – directly in the corners or through the grate. In both cases, the posts are permanently attached to the ceiling in modular spacing 60 x 60 cm.
Underfloor space (ranging in height from a few to 60 cm without grate, and in the case of using a grate even up to 200 cm) It is used for various types of installations: electric, phone calls, computer, alarm, water, CO, air conditioning, etc.). There may be holes in the plates, in which cassettes for mounting electrical sockets are mounted, phone calls, computer…
Advantages of the modular raised floor:
• Direct access to every place under the floor and free space under the entire floor surface for various installations.
• Possibility to place floor cassettes with various installation sockets anywhere on the floor and easy to change the position or install additional cassettes during operation.
• Dry assembly of ready-made products, easy-to-replace floor elements. m The floor can be fully loaded after 24 h from assembly.
• Possibility of finishing the upper floor surface with any flooring material.