SU1049636A1 - Ferroconcrete building element - Google Patents

Abstract

CONSTRUCTION REINFORCED CONCRETE ELEMENT of column type. containing longitudinal rods and transverse reinforcement in the form of metal plates with openings installed in increments of not more than half the size of the cross section of the element, characterized in that, in order to reduce labor costs in the manufacture of the element and reduce the metal intensity, the holes in the plates are made in the form of notches with variable width bent at an angle of 90 ° petals, and the length of the section of petals of greater width is equal to the pitch of the plates, and the orientation of the holes in odd and even plates along the length of the element is mutually opposite. i (lg

Description

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The invention relates to the construction and can be used in reinforced concrete elements, working in compression.

A building reinforced concrete element of the column type is known, containing longitudinal reinforcement and transverse reinforcement in the form of thin metal plates with holes, the total area of which is 15-30% of the area of the plates installed with a pitch equal to 1 / 2-1 / 3 of the transverse composition of reinforced concrete element 1.

The disadvantage of the known element is the complexity and considerable complexity of the manufacture of its reinforcement cage, which means that the plates must be strung one by one on the rods of the longitudinal reinforcement. To make the plates stable, during concreting, it is necessary to fix each plate of the building element to the bars of the longitudinal reinforcement manually, for example, with the aid of a lead wire. The use of contact-spot welding with such a carcass construction is impossible, and when electric arc welding in plates, due to their small thickness, burns occur, which reduces the load-bearing capacity of the plate.

The closest technical solution to the invention is a column-type building reinforced concrete element containing longitudinal rods, and transverse reinforcement in the form of metal plates with holes, installed with a schag not more than half the cross-sectional size of the element in which the transverse reinforcement plates have cutouts with bent petals at the points of attachment to the rods of the longitudinal reinforcement 2.

Such a solution makes it possible to somewhat reduce the labor costs for the manufacture of a reinforcing cage by using resistance spot welding. However, the labor costs are still unstable because of the welding of numerous joints, and, moreover, contact-spot welding cannot be used in cases where the longitudinal reinforcement is made of effective heat-treated steel, as welding softens it. The disadvantage of this technical solution is also the fact that the perforation of round and oval-shaped holes leads to unproductive metal losses, which can reach 15-30%.

The purpose of the invention is to reduce labor costs in the manufacture of reinforced concrete elements and a decrease in metal intensity.

The goal is achieved by the fact that in a building reinforced concrete element such as a column containing longitudinal rods and transverse reinforcement in the form

metal plates with holes installed in increments of no more than half the size of the cross section of the element, the holes in the plates are made in the form of slits of a variable width with petals bent at an angle of 90 °, the length of the section of petals of greater width equal to the pitch of the plates, and the orientation of the holes in the odd and even plates along the length of the element are mutually opposite. FIG. 1 shows a building reinforced concrete element, general view; in fig. 2 is an axonometric projection of a reinforcement cage fragment; FIG. 3 and 4 are an axonometric projection of odd and even plates, respectively; in fig. 5-8 examples of possible options for the shape and location of the holes in the plates of transverse reinforcement.

Reinforced concrete element 1 contains

Q longitudinal reinforcement 2 and uniformly distributed along the length of the element with a pitch of less than half its cross-sectional size transverse reinforcement, made in the form of odd 3 and even 4 thin metal plates with holes 5, shape

5 of which corresponds to petals 6, cut out in these plates and bent at the base at an angle of 90 °, i.e. perpendicular to plates 3 and 4. Petals 6 have a variable section width along their length and consist of a section 7 of greater width, not directly adjacent to plates 3 and 4, and a section 8 of smaller width, located at the end of the petals 6. At the same time, the length of section 7 greater width of the petals is equal to the step of installing transverse reinforcement, i.e. plate spacing

3 and 4. The holes 5 in the plates 3 and 4 may have a different shape and location on the plates, as shown in FIG. 5, 6 and FIG. 7, 8, but the orientation of the holes on the even-numbered plates 4 must be opposite to the orientation of the same holes on the odd-numbered plates 3. In addition to the holes 5, the plates 3 and 4 are provided with holes 9 for the passage of longitudinal reinforcement rods 2.

5 The assembly of the reinforcement cage of a reinforced concrete element is as follows.

Plates of transverse reinforcement alternately strung on the rods of longitudinal reinforcement 2, using holes 9. In this case, due to the specified orientation of the holes in even 3 and odd 4 plates, the petals 6 enter the DL with their narrow part; stops in the holes 5 of the plates 3 and 4 and are locking the position of all

5 (with the exception of end plates), eliminating the need for their attachment (by welding or tied) to the longitudinal rods. End plates are fixed on

Claims (1)

CONSTRUCTION REINFORCED CONCRETE ELEMENT of the column type, containing longitudinal rods and transverse reinforcement in the form of metal plates with holes installed in increments of not more than half the cross-sectional dimension of the element, characterized in that, in order to reduce labor costs in the manufacture of the element and to reduce the metal consumption, the holes in the plates are made in the form of grooves of variable width with petals bent at an angle of 90 °, and the length of the section of petals of greater width is equal to the pitch of the plates, and the orientation of the holes is odd and h tnyh plates along the length of the element are mutually opposite. Fig.! >