UA51115A - Composite reinforced concrete floor - Google Patents

Abstract

Composite reinforced concrete floor has support reinforced-concrete beams, stone-insertions and monolithic part. Support reinforced-concrete beams have reinforcement elements of changing section. Stone-insertions, placed in the middle part of the bearer of the ceiling, are made with pins. And monolithic part comprises of concrete layers of concrete of different class, this is determined by the materials epures.

Description

Description of the invention

The invention relates to construction and can be used in the construction of residential and public buildings. 2 Widely known prefabricated reinforced concrete floors, made of slabs that rest on the crossbar; monolithic ribbed ceilings with beam slabs; prefabricated - monolithic ceilings with beam slabs (1.21.

The closest to the proposed floor is a prefabricated monolithic reinforced concrete floor, which consists of load-bearing reinforced concrete beams and stones - liners and a monolithic part that fills the space between the stones - liners |ZI.

The disadvantages of the above constructions of the floor are: - high specific weight; - uneconomical use of concrete and reinforcement.

The basis of the invention is the task of improving the structure of the floor, in which, due to the peculiarities of the structural design of its elements, a reduction in the specific weight of the structure of the floor, its cost, and the cost of construction in general is achieved.

The specified task is solved by the fact that in a precast monolithic reinforced concrete floor containing load-bearing reinforced concrete beams, stones - liners and a monolithic part, according to the invention, the load-bearing reinforced concrete beams have reinforcement of variable cross-section, and are located with steps of 480 ... 800 mm, stones - the liners are located in the middle part of the floor span, made with keys, and the monolithic part consists of layers of concrete of different grades, which is determined by the epur.

The essence of the invention is explained by the drawings, where in fig. 1 shows a fragment of the longitudinal section of the floor (Fig. 1a), a diagram of materials for concrete (Fig. 16) and a diagram of materials for reinforcement (Fig. c); in fig. 2 - cross-sections of the floor.

Precast - monolithic reinforced concrete floor contains reinforced concrete beams 1 with reinforcement 2 on which stones are located -, inserts З (with keys), 4 (without keys) and a layer of monolithic concrete, sections 5. 6, 7. "

Reinforced concrete beams 1, unlike the prototype, are located with a step of 480 ... 800 mm. depending on the size of the stones - liners.

In the middle of the span (section 1 - 1), where the maximum bending moment acts, the floor is made of a supporting reinforced concrete beam 1 with reinforcement 2, on which stones are located - inserts З with pins, and a layer of monolithic concrete 5, which fills the pins and the space between the stones - 3 inserts; when reducing the "- bending moment (section 2 - 2), the floor is made of stones - inlays 4, located on the section of the supporting reinforced concrete beam 1 with reinforcement 2, which has an area smaller than in the middle of the span, and monolithic concrete 5; with a further reduction of the bending moment (section 3-3), the floor contains a load-bearing "-- reinforced concrete beam and with reinforcement 2, on which stones - liners 4 are located, and a layer of monolithic concrete 6, 3o whose strength is less than the strength of monolithic concrete 5 in sections 1 - 1 and 2 - 2: on the supporting sections o (section 4 - 4), the floor is made of a supporting reinforced concrete beam 1 with reinforcement 2, which has a cross-sectional area smaller than that of the reinforcement in sections 1 - 1, 2 - 2 and 3 - C, on which there are stones - liners 4, and a layer of monolithic concrete 7, the strength of which is less than the strength of monolithic concrete 6 (section C - 3). "

The proposed structure of the floor, in contrast to the prototype, works as follows under the action of loads: C in the middle of the span, where the largest bending moment acts, the following are included in the work: c - reinforced concrete beams with reinforcement, which has the largest cross-sectional area; z" - monolithic part; - stones - inserts that work due to keys.

When the bending moment is reduced, the following are included in the work: - reinforced concrete beams with reinforcement having a smaller cross-sectional area; i-th - monolithic part. - In the supporting sections, the floor generally works only at the expense of reinforced concrete beams.

Thus, a significant advantage of such a ceiling is a reduction in the specific weight of the ceiling structure, its cost, and the cost of construction in general. -k 70 Sources of information 1. V.M. Bondarenko, D.G. Suvorkin. Reinforced concrete and stone constructions: Textbook for students of specialized higher education institutions, "Industrial and Civil Engineering". - M.: Vyssh. Shk., 1987. - 384 p.: illustrations. 2. Baikov V.N., Sygalov Z.E. ZhBK General course. Textbook for universities. Ed. 3rd, corrected. M., Stroyizdat, 1978, 767 p. 29 Z. Calculation and design of composite small-sized beams in the stage of installation / N.V.Savytskyi, v. Yu.A. Kozhanov, S.A. Pereyaslavets, I.F. Koshman //Sb. science works of the Dnieper State Academy of Construction and Architecture!; Dn-sk- 1997 - p. 48 - 50.

Claims (1)

60 Formula of the invention Precast monolithic reinforced concrete floor, containing load-bearing reinforced concrete beams, stone-liners and a monolithic part, which is distinguished by the fact that the load-bearing reinforced concrete beams have reinforcement of variable cross-section and are located in steps of 480...800 mm, stone-liners are located in the middle part of the span overlap, because they are made with keys, and the monolithic part consists of layers of concrete of a different class, which is determined