SU1270255A1 - Prefabricated ferroconcrete floor - Google Patents

Abstract

NECKLAYED CONCRETE COVERAGE, including supporting structures, supported on them non-flying elements and pre-stressed connections, attached by means of embedded parts to the supporting structures and ends of the span elements, characterized in that, in order to reduce the material capacity, in advance, it is necessary to reduce the material-intensiveness of the prefabricated elements, which are designed to reduce material-intensiveness, previously used, in order to reduce the material capacity, previously used, in order, to reduce the material capacity, previously used, in order, to reduce the material capacity, previously used, in order, to reduce material-intensive, preformed elements, which are preformed, are preformed, and they are used to reduce material-intensive, preformed elements, previously used, in order to reduce material-intensiveness, previously used, in order, to reduce the material capacity, previously used, in order, to reduce material-intensive, preformed elements, previously used, in order to reduce material-intensiveness, preformed elements, preformed elements, which are used to reduce material-intensiveness, preformed, preformed elements, previously used, in order to reduce material-intensiveness, preformed elements, pre-stressed, preformed, which are designed to reduce the material intensity, previously used. are installed symmetrically with respect to the center of the span of the iodine by the angle directed from the longitudinal axis of the beam to the supports, the angle being determined from the relation - argtg-- -r- (n - l), 2hn + pv where n is the number of links, is located half the length of the beam; b - nshrina nlity; hn is the height of the plate; he is the height of the beam. (L GchE -vj o th O-1 01

Description

The invention relates to the construction and can be used in the manufacture of coatings and ceilings of buildings and structures.

The aim of the invention is to reduce material consumption.

In FIG. 1 shows the proposed design; in FIG. 2 is a section AA in FIG. 1; in FIG. 3 - placement of links with an odd number of panels.

Precast concrete floors include load-bearing structures in the form of beams 1 and slabs 2, forming span elements interconnected by prestressed bonds 3 located at an angle. Ties 3 are made of 15 sheet or strip steel and are directed from the longitudinal axis of the beams 1 to the supports. To fasten the ties 3 at the ends of each plate 2 'at the upper corner closest to the supports of the beams 1, embedded parts 4 of the sections of the rolling corners are installed, and in the assembled ²⁰ empty reinforced concrete beams 1, the embedded parts 5 are installed on the upper surface in the corresponding places. All connections are made on welding; longitudinal seams between the plates 2 monolithic concrete 25 mixture 6.

A positive effect is achieved due to the bending moment unloading the beam 1 from the action of the forces acting in inclined connections when acting on the overlapping operational load. At the manufacturing stage 30, all loads are perceived by beam elements. After curing the concrete mixture 6, filling the longitudinal grooves between the plates 2, under the action of the load, inclined connections 3 are included in the work, as a result of which the beams 1 perceive a smaller bending moment.

The maximum unloading moment is achieved at the angle of inclination of the bonds, determined by the formula

where η is the number of bonds located at half the length of the beam;

b is the width of the plate;

h _n is the height of the plate;

hi — beam height.

To reduce the deflection of the beam elements, a preliminary tension of inclined connections is performed (after concrete is set to monolith in the longitudinal seams of the design strength plates). In this case, the calculation of the deflections is made taking into account the forces acting in inclined connections.

The proposed device ensures the joint operation of floor slabs with a beam due to the connection of plates with a beam with diagonally directed connections. In this case, the beam, transmitting the bending moment to the bonds, is unloaded, and floor slabs are included in the work, converting the tensile strength of the bonds into the compressive force of the plate.

FIG. 2

Claims (1)

COMBINED REINFORCED-CONCRETE COVERAGE, including supporting structures, span elements supported on them and prestressed connections attached by means of embedded parts to supporting structures and ends of span elements, characterized in that, in order to reduce material consumption, prestressed connections are installed symmetrically with respect to the center of the span under fragility directed from the longitudinal axis of the beam to the supports, and the angle is determined from the relation where n is the number of bonds located at half length Alki; b is the width of the plate; hn — plate height; h ₆ is the height of the beam. (L 1270255 A1 I