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RU-2861412-C1 - STEEL-CONCRETE FLOOR

RU2861412C1RU 2861412 C1RU2861412 C1RU 2861412C1RU-2861412-C1

Abstract

FIELD: construction. SUBSTANCE: invention can be used in the manufacture of steel-concrete structures for coverings and floors of buildings and structures. In a steel-reinforced concrete floor, comprising steel beams made of thin-walled Z-shaped profiles, steel anchors and a concrete slab on steel profiled sheeting, the sheeting is laid on the formed flange of the web and on the lower flange of the Z-shaped profiles. The stamping of the Z-shaped profile is made such that in the middle of the section height on the web, a flange and a vertical section are formed. Wherein the end of the web and the flange of the sheeting at both ends abuts against the vertical section of the web of the Z-shaped profiles, which prevents leakage of liquid concrete during grouting. A continuous concrete T-section of the floor above the steel beam is provided, increasing the load-bearing capacity of the steel-concrete floor. EFFECT: increasing the load-bearing capacity of the steel-concrete floor and best ensuring the joint work of the slab with the steel beam. 2 cl, 3 dwg

Inventors

  • ZAMALIEV FARIT SAKHAPOVICH
  • Zamaliev Emil Faritovich

Dates

Publication Date
20260505
Application Date
20250520

Claims (2)

  1. 1. A steel-concrete floor comprising metal beams installed at intervals, each of which is made of bent Z-shaped sections, sheets of steel corrugated sheeting laid on the beams, on which a monolithic slab is concreted, connected to the beams by means of anchors, characterized in that Z-shaped profiles with lower and upper chords having cavities are used, the sheets of corrugated sheeting rest with one end against the vertical section of the wall and rest on its horizontal section, and with the other - on the lower chord of the Z-shaped profile, which, before installing the beams to the design elevation, are filled with concrete of increased tensile strength: polymer concrete or fiber concrete, and the upper cavities of the Z-shaped profiles are filled with monolithic concrete during the execution of the floor slab.
  2. 2. A reinforced concrete floor according to paragraph 1, characterized in that the beam anchors are formed by studs made of self-tapping screws or studs stamped from the shelves of the upper chord.

Description

The invention relates to the field of construction and can be used as load-bearing structures for roofs and ceilings of buildings and structures. A ribbed steel-reinforced concrete slab is known, which includes a metal beam and a reinforced concrete slab connected to it with anchors and steel corrugated sheeting, where at the points of contact with the beam an opening is made with notches, which is filled with concrete (see USSR a/s No. 1231171, E04C 3/20, 15.05.1986, Bulletin No. 18). The disadvantages of this solution are the incomplete closure of the ends of the opening created by the cuts, which will lead to leakage of liquid concrete during pouring, and the intermittent filling of the cavities with concrete in contact with the steel beam, which cannot ensure high strength of the reinforced concrete floor. A steel-reinforced concrete floor is known, including steel beams, anchors and monolithic concrete on steel corrugated sheets, where at one end the corrugated sheets with a slot in the wall rest against the beam wall, and the other end - with the upper chord - is supported on the beam shelf and is closed by bends of the walls, which ensures no leakage of liquid concrete and the continuity of the concrete slab above the beam (see Patent RF No. 2785159 E04B 5/40, 05.12.22, Bulletin No. 34). The disadvantage of this solution is the labor-intensive nature of manufacturing the steel corrugated sheet: the need to make a cut to fit the steel beam flange and bends to close the other end of the sheeting, and the lack of fixation of the corrugated sheet on the upper chord of the beam, which cannot ensure the high load-bearing capacity of the reinforced concrete floor. A steel-reinforced concrete beam is known - including a steel thin-walled Z-shaped profile, in which reefs and studs are stamped, on which reinforcement is placed and filled with concrete: at the upper chord with increased compressive strength, at the lower chord - with increased tensile strength (see Russian patent No. 190913 E0461/20, 16.07.2019, Bulletin No. 20). Composite-reinforced concrete beams are designed for use as floor beams. However, deck slabs can only be placed and secured to the top chord. Placing deck slabs on the top chord increases the floor height. Placing deck slabs, which primarily operate under compression, away from the middle zone of the working section results in unnecessary material consumption and cannot ensure high strength of the composite concrete floor. The disadvantages of prototypes are overcome by using a steel-concrete floor slab comprising a Z-section steel beam with horizontal and vertical web sections, anchor rods, steel corrugated sheeting (SPN), and cast-in-place concrete. The ends of the corrugated sheeting are supported on the horizontal web sections on one side and on the bottom chord on the other side of the Z-section at the zero axis of the floor beam. The end of the corrugated sheeting rests against the webs of the Z-section beams, preventing leakage of liquid concrete during the floor pouring process. Positioning the SPN at the level of the lower web flanges and the bottom chord of the steel Z-beam improves the anchorage of the decking and its overall rigidity, while positioning it at the zero axis of the beam's effective cross-section significantly increases the load-bearing capacity of the floor due to the formation of a T-section. Fig. 1 shows a fragment of a reinforced concrete floor, Fig. 2 shows a fragment of Z-shaped profiles with stamped reefs and anchors, Fig. 3 shows a support unit for corrugated sheets. The reinforced concrete floor includes a steel beam 1, corrugated sheet 2 (Fig. 1), anchors 3 (self-tapping screws - 3a) or cut studs, monolithic concrete 4 (Fig. 3). The upper chords of bent beam 1 are constructed from Z-shaped profiles and are fitted with anchors made from self-tapping screws 3a or punched studs 3b. Grooves 7 are punched in to improve adhesion to the concrete (Fig. 2). Shelves 5 and vertical sections 6 are formed in the walls of the Z-shaped profile, and grooves 7 are stamped along the edges of the upper chord to improve adhesion to the concrete. The lower cavity of the Z-shaped profile is filled with high-tensile concrete, such as polymer concrete or fiber-reinforced concrete, before the beams are installed at the design elevation. After laying out the corrugated sheet 2 along the length of the beam 1, a concrete slab 4 is made from monolithic concrete (with increased compressive strength). Supporting the ends of the corrugated sheet on the shelves of the wall of one beam and on the lower chord of another Z-shaped beam and close to the wall of the Z-shaped profile increases its overall rigidity before concreting, then makes it possible to create a solid slab over the T-shaped concrete beam, increasing the load-bearing capacity of the beam and the reinforced concrete floor as a whole.