Precast Concrete Floors—Fabricated Beam

Steel fabricated beams can be used as an integral means of support for precast concrete floors. These are an overall depth and space saving alternative compared to down-stand reinforced concrete beams or masonry walls. Only the lower steel flange of the steel beam is exposed. To attain sufficient strength, a supplementary steel plate is welded to the bottom flange of standard UC sections. This produces a type of compound or plated section that is supported by the main structural frame.

A standard manufactured steel beam with similar applications to the plated UC shown on the previous page. This purpose made alternative is used with lightweight flooring units, such as precast concrete hollow core slabs and metal section decking of the type shown on page 499.

Raised Flooring ~ developed in response to the high-tech boom of the 1970s. It has proved expedient in accommodating computer and communications cabling as well as numerous other established services. The system is a combination of adjustable floor pedestals, supporting a variety of decking materials. Pedestal height ranges from as little as 30 mm up to about 600 mm, although greater heights are possible at the expense of structural floor levels.

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Decking is usually in loose fit squares of 600 mm, but may be sheet plywood or particleboard screwed direct to closer spaced pedestal support plates on to joists bearing on pedestals. Cavity fire stops are required between decking and structural floor at appropriate intervals (see Building Regulations, A D B, Volume 2, Section 9).

Sound Insulation ~ sound can be defined as vibrations of air which are registered by the human ear. All sounds are produced by a vibrating object which causes tiny particles of air around it to move in unison. These displaced air particles collide with adjacent air particles setting them in motion and in unison with the vibrating object.

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This continuous chain reaction creates a sound wave which travels through the air until at some distance the air particle movement is so small that it is inaudible to the human ear. Sounds are defined as either impact or airborne sound, the definition being determined by the source producing the sound. Impact sounds are created when the fabric of structure is vibrated by direct contact whereas airborne sound only sets the structural fabric vibrating in unison when the emitted sound wave reaches the enclosing structural fabric.

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The vibrations set up by the structural fabric can therefore transmit the sound to adjacent rooms which can cause annoyance, disturbance of sleep and of the ability to hold a normal conservation. The objective of sound insulation is to reduce transmitted sound to an acceptable level, the intensity of which is measured in units of decibels (dB). Read More About: bolly4u

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