Orthogonal-diagonal U-shaped steel and concrete composite open-web floor and manufacturing method

Abstract

The invention discloses an orthogonal-diagonal U-shaped steel and concrete composite open-web floor. An isosceles triangle mesh is arranged on the peripheries of a building floor, and a square open-web mesh which form an included angle of 45 degrees with the peripheries is arranged at the middle part of the building floor; the right-angle side dimension a of each isosceles triangle on the peripheries and the sloping side length a1 of the isosceles triangle is in a a=a1*sin45 degrees relation; the building floor is formed by connecting lower chords with upper chords through reinforced concrete shear keys; each lower chord consists of the combination of a U-shaped steel member which used as both a template and a stress steel plate and a reinforced concrete layer in a U-shaped steel member channel, so that the problem of crack developing cannot be generated on the reinforced concrete of a multi-story long-span floor with a long and narrow plane; when the novel floor structural system is used for the multi-story long-span long and narrow plane, the concrete and steel consumption of the floor can be reduced; after the span is greater than 30 meters, the crack developing of the lower chords can be effectively controlled; the thickness of the floor is reduced.

Description

technical field [0001] The present invention relates to a floor and its manufacturing method, in particular to an orthogonal oblique U-shaped steel and concrete composite hollow floor and its manufacturing method, especially for multi-layer (2-4) large-span (L y =30m-36m), long side dimension L x = (60m-72m) above the narrow and long plane (L x / L y ≥2) A method for making a U-shaped steel and concrete combined hollow floor, which belongs to the technical field of multi-storey and large-span buildings. Background technique [0002] Over the past 36 years of reform and opening up, my country's economic construction has developed rapidly, and the development of construction engineering has attracted worldwide attention. However, public and industrial buildings with large spans (Ly=30m-36m) in construction engineering are restricted by traditional structural systems (frames). 99% of them are single-storey, and a very small part is multi-storey and long-span public buildings, ...

AI Technical Summary

Problems solved by technology

Many public and industrial buildings, due to functional and technical requirements, have narrow and long floor plan, such as figure 1 As shown, the multi-storey (3 floors) long-span (Ly=31.2m) public building narrow and long (Lx / Ly=62.4 / 31.2=2>1.5) floor plan floor area 62.4m×31.2m=1947m 2 , the area of ​​the third floor is 5841m 2 (coordinates x, y); that is, when the ratio of the floor plane length direction (Lx) to the span (Ly) dimension Lx / Ly>1.5, the floor load is mainly transmitted from the direction of the short span to the supporting columns on both sides, and the length direction The gable columns at both ends bear very little floor load, which is caused by the uneven stress on the floor after the floor is narrow and long (Lx / Ly > 1.5). At this time, the internal force along the span direction is along the length of the floor The inward force (5-50 times) forms a one-way force, that is, the long direction is completely equipped with rods and reinforcement according to the structure, resulting in waste of materials

When the span of the narrow and long plane floor is when Ly>30m, cracks appear in the lower chord of the orthogonally placed reinforced concrete grid vierendeel beam, and when the U-shaped cross-section steel plate is used, the other aspect (longitudinal) internal force is extremely small, so no U-shaped Cross-section steel plate, set according to the structure (δ=6mm) is also a waste, such as figure 2 As shown, it is a U-shaped steel and concrete orthogonally placed composite hollow sandwich slab floor, grid a×a=2.4m×2.4m=5.76m 2 , a total of 338 grids, namely 338×2.4m×2.4m=1947m 2 , according to the structural layout method of application number 200610200188X, more than 90% of the floor load is transmitted by the vierendeel beam in the span direction, forming a one-way force, only 12.5% ​​of the load is transmitted in the long direction, and 87.5% of the load is transmitted in the span direction, and the force is extremely uneven. Its stiffness and comfort are also reduced

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