SU1617112A1 - Fireproof building structure - Google Patents

Abstract

The invention relates to the construction and can be used in the construction of floors of buildings and structures in rooms with aggressive environment. It allows you to increase the fire resistance while reducing structural damage during fire exposure. In the fire-resistant building structure, the inserts 2 are located under the reinforcement rods 3 in the supporting parts and in the middle part of the span. The liners 2 are made of a non-combustible heat insulating material. 1 il.

Description

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The invention relates to the construction of C can be used in the construction of floors of buildings and structures E | rooms with non-aggressive environment. I The aim of the invention is to increase C nestiness while reducing structural damage during fire exposure. The drawing shows a fragment of the arrangement of inserts in the structure.

The fire-resistant building construction contains a concrete body 1, thermal insulation liners 2 and reinforcing bars 3. The thickness of the liner sections is equal to the thickness of the protective layer of concrete and is at least 5-20 mm. The width of the liner section is determined by B, depending on the thickness of the protective layer of concrete, the diameter of the reinforcement and the thermal diffusivity of concrete, reduced to the average temperature of the protective layer.

Fire retardant liners are located in the support areas in order to prevent the reduction of the strength of reinforcement anchoring during thermal exposure, as well as

mid span of the structure in the zone of maximum bending moment and maximum stress in the reinforcement. The length of the liners corresponds to the design of 1% of the anchoring length of the reinforcement.

Any rigid non-combustible heat-insulating materials (for example, foam concrete or aerated concrete) with low thermal diffusivity are used as an inlay. Moreover, the lower the thermal diffusivity of the E. liner material, the higher its heat insulating capacity.

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Fire-resistant design is made as follows.

Fireproof inserts are placed on the bottom of the formwork. Then rebar is laid. After that, the formwork is filled with concrete. At the same time, the surface layer of thermal insulating liners adjacent to the concrete of the panel is impregnated with concrete mortar, due to which the reinforcement is protected against corrosion and ensures reliable adhesion of the liners with the concrete of the structure. Further manufacturing technology is no different from the usual, adopted at the factories of concrete products.

The use of this fire-resistant building structure allows to increase the fire limit of the design structure and reduce its damage during fire exposure, which reduces the cost of restoring buildings and structures after fires.

Claims (1)

Invention Formula Fire resistant construction, including a concrete body, reinforcement and fire retardant elements, characterized in that, in order to increase fire resistance while reducing structural damage during fire exposure, fire retardant elements are in the form of inserts of rigid non-combustible heat insulating material located in a protective layer a layer of concrete in the supporting areas and in the middle part of the span under the rods of the working reinforcement from the side of the fire impact.