RU2641141C1 - Long-dimensional steel concrete element - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: long-length steel concrete element is proposed, including a concrete element with a strengthening body encompassing it from rolling profiles interconnected by transverse elements. New is that the strengthening body is connected to a concrete element for joint work with the help of transverse elements located in the concrete body connecting diagonally located corner sections.

EFFECT: increased bearing capacity, reduction of labour intensity of manufacturing and reduction of overall dimensions.

6 cl, 10 dwg

Description

The invention relates to the field of construction and can be used for the manufacture of load-bearing and non-bearing elements of building structures, mainly rod (columns, pylons, beams, braces of trusses, etc.).

A known columnar steel-reinforced concrete element containing a concrete core, four rolling profiles in the form of corners and four vertical reinforcing bars installed in it, the reinforcing bars being located closer to the outer edge of the concrete core than rolling profiles (Guide for the design of reinforced concrete structures with rigid reinforcement. A.P., Vasiliev, N.I. Katin, N.A. Egorov and others. The Research Institute of Concrete and Reinforced Concrete of the Gosstroy of the USSR (NIIIZhB) is a central research and design experimental Institute of Industrial Buildings and Structures of the Gosstroy of the USSR (TSNIIIPROMZDANIY. Stroyizdat. 1978 (the scheme of the steel-concrete element is shown in Fig. 15).

The disadvantages of this element are: firstly, the low bearing capacity of the column for the perception of bending moment due to the fact that the steel profiles are located close to the center of the section of the column, and secondly, low reliability due to the fact that between the corners of the column and concrete at significant loads, it is possible to overcome the frictional forces between the corner and concrete, as a result of which the joint work of the corner profiles and the concrete of the column is disrupted.

A steel-concrete element in the form of a column is known, including a concrete core bounded by rolling profiles, to which profiled sheets with transverse corrugations are attached by means of connecting elements, and connecting elements are made of a corner profile and attached to the rolling profiles, while the profiled sheets are attached to the shelves of the corner profile with the outside. (RF patent №2122083 C1, priority date 05/28/1997, publication date 11/20/1998, authors: Chikhladze ED, UA, Kolchunov V.I., RU and Adamyan I.R., RU).

The disadvantages of this known analogue are the high labor costs and low bearing capacity of the attachment site of the profiled sheet to the rolling profiles, as well as the significant overall dimensions of the column due to the corrugation of the corrugated sheet protruding beyond the plane of the column.

As a prototype, a steel-concrete element was adopted in the form of a reinforced column equipped with a metal reinforcing cage enclosing it from vertical corner profile elements with holes in the shelves and transverse connecting strips, the reinforcing cage being connected to the column to ensure joint operation using concrete connecting dowels located in the holes reinforcement cages and in holes coaxially made in the column, while the holes in the shelves of the elements of the reinforcement cage are arranged in rows with the same pitch and made with the possibility of the formation of connecting dowels with filler when concreting holes or when crimping perforated elements of a metal casing with clamps (RF Patent No. 2593611 C1, priority date 06/18/2015, publication date 2016, authors: Yurchenko A.A. et al., RU, prototype).

The disadvantages of the prototype are:

- firstly, low bearing capacity due to the weakening of the vertical corners of the holes; due to the inefficient arrangement of the transverse elements, namely, not in the direction of the axis of the minimum rigidity of the vertical corners; due to the low bearing capacity of the keys;

- secondly, the high complexity of manufacturing, due to the need to drill holes in vertical corners;

- thirdly, the low corrosion resistance of the transverse strips and welds of the mount due to their location outside the cage;

- fourthly, significant overall dimensions, due to the presence of protruding transverse bars for the corner shelf and reducing the usable volume of the building;

- fifthly, the high cost of the element due to the need for anti-corrosion and / or fire and / or adhesive coating on the transverse strips.

The technical problem solved by the invention is the creation of a long-length steel-reinforced concrete element with an effective reinforcement metal structure from steel rolling elements, which provides more efficient joint work with the concrete core, high load-bearing capacity, corrosion resistance, as well as labor-intensiveness in manufacturing, reduction of overall dimensions and cost of the element.

To solve a technical problem, a long-length steel-concrete element was proposed, including a concrete element with a reinforcing cage covering it from steel rolling profiles. According to the invention, it is new that the reinforcement cage is connected with a concrete element for working together with the help of transverse elements located in the concrete body connecting diagonally located corner profiles.

According to the invention, the transverse elements are made of single reinforcing rods or closed rods in the form of rectangles that are attached to diametrically located corners, in the places of internal rounding of the shelves, either by means of welded joints or by fixing with a knitting wire in the holes made in the shelves.

According to the invention, the transverse elements are made in the form of pins connecting diagonally spaced corner profiles with nuts and support plates mounted on the threaded ends of the studs, while the support plates are provided with holes for the studs and are parallel mounted in grooves made in the fastened corners at the same level.

According to the invention, the long-length steel-concrete element contains additional transverse elements on the sides of the reinforcement cage, which are welded to the shelves of the corners from the inside.

According to the invention, the diagonal transverse elements of the rods, single or in the form of closed rectangles, mounted one above the other in mutually perpendicular directions, are interconnected at the contact points located on the central axis of the element with a knitting wire.

According to the invention, at least one of the diagonal transverse elements is located in the concrete body with an inclination to the central axis of the element.

In FIG. 1 schematically depicts a section of a long-length steel-reinforced concrete element with corner rolling profiles connected by diagonal transverse reinforcing bars, general view; in FIG. 2 is a section AA in FIG. one; in FIG. 3 schematically shows a portion of a reinforcement cage with corner rolling profiles connected diagonally by transverse reinforcing bars, spatial view (concrete element not shown conventionally); in FIG. 4 is the same, in an embodiment of the diagonal transverse elements of steel plates, with additional transverse elements installed on the sides of the reinforcement cage; in FIG. 5 schematically shows two diametrically located corner profiles connected by a transverse element of reinforcing bars in the form of a closed rectangle; in FIG. 6 schematically depicts the attachment of the transverse element in the form of a closed rectangle to the corner using a knitting wire and holes in the shelves of the corner; in FIG. 7 schematically shows a section of a reinforcement cage with corner rolling profiles, diagonally connected by steel plates transverse and inclined with respect to the central axis, spatial view, (concrete element not shown conventionally); in FIG. 8 schematically depicts a section of a vertical corner at the point of attachment of a stud to it and securing it with nuts and support plates; in FIG. 9 - node I in FIG. 8; in FIG. 10 schematically shows closed rods mounted on top of each other, in mutually perpendicular directions, connected to each other at contact points (in the center of the element) by a knitting wire.

A long-length steel-concrete element, made, for example, in the form of a column, contains a concrete element 1 and a reinforcing sleeve integrally connected with it, covering the concrete element (Fig. 1). The reinforcement cage is made in the form of a spatial metal structure formed of steel corner profiles 2, interconnected by diagonally arranged transverse elements in the direction of the least stiffness of the corner.

As used transverse elements, in particular, there can be: reinforcing bars 3 (Fig. 1, Fig. 2), steel strips 4 (Fig. 4, Fig. 7), closed reinforcing bars in the form of a rectangle 5 (Fig. 3, Fig. 5, Fig. 6, Fig. 10), studs 6 (Fig. 8, Fig. 9).

The fastening of the transverse rod elements, both single 3 and closed in the form of a rectangle 5, is carried out in the places of the internal rounding of the shelves of the corners 2 using, for example, welds 7 (Fig. 5), or using a knitting wire 8, passed through holes 9 in corners 2 (Fig. 6).

The fastening of the transverse elements in the form of steel plates 4 is also carried out in places of internal rounding of the shelves of the corners using welds (Fig. 4).

The fastening of the diagonally located corner profiles 2 can be performed using the studs 6 and the nuts 10 mounted on their threaded ends, which are attracted to the thrust plates 11, which are provided with stud holes and are installed in parallel in the grooves made in the fastened corners at the same level (Fig. 8 , Fig. 9).

In addition to the transverse elements mounted horizontally, the spatial elements 12 can also be installed in the spatial metal structure of the reinforcement cage, inclined to the central axis (Fig. 7).

When the transverse elements of the rods are arranged in the form of closed rectangles one above the other in mutually perpendicular directions, nodal connections 13 are formed at the points of their contact located on the central axis of the element using a knitting wire (Fig. 10).

For additional reinforcement, the long-length bearing element comprises transverse elements 14 on the sides of the reinforcement cage, which are welded to the shelves of the corners from the inside.

The manufacture of a long-length steel-concrete element is carried out by monolithic erection with the simultaneous formation in the formwork of a reinforcement cage from rolling corners with transverse elements pre-welded to them. In this case, it is possible to use a metal cage as a permanent formwork of a concrete element. The joint work of the concrete element 1 and the elements of the reinforcement cage is ensured by the anchoring of the transverse elements in the concrete body.

Thus, the advantage of the inventive long steel element in comparison with the prototype is as follows:

- to increase the bearing capacity due to the implementation of a more effective reinforcement cage in the form of a spatial metal structure, which ensures the effective diagonal placement of transverse elements in it in the direction of the least stiffness of the corner, as well as the effective adhesion of the reinforcement cage elements to the concrete element due to the use of anchors the form of transverse elements;

- to reduce the complexity of manufacturing due to the lack of the need for drilling holes that provide adhesion of the concrete element with a clip reinforcement;

- to increase the corrosion resistance of the transverse elements and welds of their fastening due to their more rational location in the concrete body;

- in reducing overall dimensions due to the placement of transverse elements inside the contour of the corners;

- in reducing the cost of the element due to the absence of the need to use protective coatings on the transverse elements of the reinforcement cage.

Achievable technical result consists in increasing the bearing capacity, reducing the complexity of manufacturing and reducing overall dimensions.

Claims (6)

1. A long-length steel-concrete element comprising a concrete element with a reinforcing cage covering it from steel rolling profiles, characterized in that the reinforcing cage is connected with a concrete element for working together using transverse elements located in the concrete body connecting diagonally located corner profiles. 2. A long-length steel-concrete element according to claim 1, characterized in that the transverse elements are made of single reinforcing bars or closed rods in the form of rectangles that are attached to diametrically located corners in the places of the inner fillet round the shelves either by means of welded joints or by fixing the knitting wire in the holes made in the shelves. 3. The long-length steel-concrete element according to claim 1, characterized in that the transverse elements are made in the form of studs connecting diagonally located corner profiles with nuts and support plates mounted on the threaded ends of the studs, while the support plates are provided with holes for the studs and are parallel mounted in grooves made in the fastened corners at the same level. 4. A long-length steel-concrete element according to claim 1, characterized in that it contains additional transverse elements on the sides of the reinforcement cage, which are welded to the shelves of the corners from the inside. 5. A long-length steel-concrete element according to claim 1, characterized in that the diagonal transverse elements of the rods, single or in the form of closed rectangles, mounted one above the other in mutually perpendicular directions, are interconnected at contact points located on the central axis of the element knitting wire. 6. The long-length steel-concrete element according to claim 1, characterized in that at least one of the diagonal transverse elements is located in the concrete body with an inclination to the central axis of the element.

Images