HU180433B - Concrete reinforcement set from uniaxially load-bearing reticulate reinforcement members of the same width - Google Patents

Abstract

The invention relates to a series of uniaxially supporting reinforcing elements of equal width, in particular of reinforcing mats for reinforced concrete solid ceilings or the like, with an increasing within the row tensile load capacity of the longitudinal reinforcement. The invention is intended to a

Description

«

Concrete reinforcement series of single-width, single-axis, load-bearing mesh reinforcement elements <i v

2

FIELD OF THE INVENTION The present invention relates to a series of reinforcing bars of mesh reinforcing elements of equal width, uniaxially bearing, particularly for solid reinforced concrete ceilings, in which the longitudinal reinforcement of each reinforcing element has increasing tensile strength.

There are a large number of different types of mesh reinforcements which, for example, are separated from one another. they differ in the distance between the long irons and the cross irons, and in the cross-sectional dimensions of the irons. These generally have standard lengths and widths; mesh reinforcements are usually manufactured in lengths of 6 meters, with different lengths · cut, custom made or sometimes overlapped. Uncoverable waste is inevitable when cut, and in the case of individual production it is naturally more expensive and takes longer to transport. In addition, the overlap of two prefabricated mesh reinforcements requires careful assembly and assembly inspection. In practice, scaling of reinforcing bars is usually treated as a custom manufacturing assignment. The designer prepares the formwork and ironing plans in view of the load on each component. This is followed by costly and time-consuming cutting, bending and then ironing, which require careful control.

Attempts have been made to remedy these shortcomings, for example by producing 180 433 women in mesh stock, but the large number of net types that meet all requirements had to be reduced.

For example, a concrete reinforcement series of the type described in the preamble is already known from Austrian Patent 322,168. It consists of a series of successive mesh-like reinforcing elements, with the number of longitudinal irons increasing from an ironing element to an ironing element with the same width 10.

This mutual alignment of successive reinforcing elements in the series enables the elements to be arranged either densely next to each other or at a defined distance, which, however, does not exceed the maximum distance between the longitudinal irons in the reinforcing elements. This solution can be utilized over a wide range without loss of any required steel cross-section. However, depending on the distance to the adjacent element, the reinforcing element covers surfaces of different sizes, so that the reinforcement of the building element requires much more precise selection of reinforcement than has been the case up to now. Further, in the successive series, the reinforcing diameters of the reinforcing bars are chosen such that within each series the longitudinal bars have the same cross-sectional area, but with increasing cross-sectional area from series to series. This achieved that the k1

180 433 reinforcing elements with the same cross-sectional area but different numbers of reinforcements were created in different series.

For a given reference steel cross-sectional area, at least two different reinforcing elements are always available based on the reinforcement spacing. In this way, 42 different ironing elements can be used to carry out common building tasks.

Austrian Patent No. 314,162 describes two steps of reinforced concrete consisting of two overlapping webs, each of which is smaller than the span of the reinforced concrete element to be manufactured. The mesh reinforcements may have the same length or cross-sectional area and be part of a series of reinforcements. This proposal is based on the fact that 80% of the reinforcement cross-section and only 20% of the reinforcement cross-section are influenced by loads and thickness. They have also endeavored to provide the least possible number of mesh reinforcements for different spans and loads. Overlapping can reduce the number of units in the ironing sequence, but the installation itself has not been made much easier, as it has to be carried out with special care and inspection.

It is an object of the present invention to provide a series of concrete reinforcements, mainly for reinforced concrete sections of residential buildings, in particular solid reinforced concrete ceilings of different spans, which are considerably simpler and less expensive to use than known solutions.

The object of the present invention is therefore to provide a series of reinforcing elements of the type described in the introduction, which further reduces the number of reinforcing elements within the series and allows for the production of reinforced concrete ceilings without sizing and on-site cutting by simply selecting the appropriate reinforcing elements .

The object of the present invention has been solved by increasing the length of the individual reinforcing elements within the series, and the longitudinal reinforcement of each reinforcing element being substantially the same per unit surface area, approximately equally distributed. Preferably the longitudinal reinforcement is the torque! FIG.

It is desirable to have an embodiment in which the length of the successive reinforcing elements within the series is increased by about twice the minimum contact length.

The invention was based on the following considerations: According to statistics, the use of reinforced concrete is approximately 75% in the construction of residential and similar buildings. Statistical tests on such buildings have shown that the additional load on slabs and beams in the normal span range is approximately constant, fluctuating by ± 5%. However, this range of fluctuation is insignificant as it can be compensated for by the safety factor of both steel and concrete in the effective width of loads. Therefore, in such buildings, we can start with a substantially constant load, with the only determinant size being the span and the free aperture size.

A series of prefabricated beams associated with each span is already known, e.g. Austrian Patent Application No. 305,567. However, these reinforced concrete beams are all equally ironed and combined with lining bodies of different widths and heights. The desired load-bearing capacity is achieved here by varying the length of the beam and selecting the lining bodies. However, for monolithic reinforced concrete structures, this simplification cannot be used without installation instructions and careful inspection.

The longitudinal reinforcement of the va20 shingle elements of the concrete reinforcement series of the present invention is likewise primarily related to the free aperture size, i.e. the spacing, and therefore each of the ironing elements of the series is designed differently. However, the number of different reinforcing elements can be significantly reduced compared to known series. Another important advantage is that the dimensioning of the reinforcement can be completely eliminated and installation and inspection time can be minimized. Thus, using the concrete reinforcement series 30 according to the invention, it is first only necessary to determine the free aperture size, for example in the case of a monolithic slab, and accordingly select the appropriate number of reinforcing element types and place them side by side. These operations can also be performed easily and reliably by trained workers.

According to our experimental experience, it has been found advantageous to increase the length of successive reinforcing elements within the series by 20 cm for 2 to 6 meter spacing and by 25 cm for 6 to 8 meter spacing.

In our experience, the standard requirements for free aperture sizes from 2 to 8 meters include a series of 25 ironing elements of incremental length and with different lengths of ironing arrangement. However, it should be noted that as many as 90% of such construction can be completed with 15 pieces of ironing material.

It is also possible to make the series according to the invention in which the longitudinal reinforcement has the same cross-section, but the longitudinal cross-sections are of increasing cross-section within the series. In the particular embodiment of the invention for transport weight reduction and steel utilization, the longitudinal reinforcement consists of longitudinal acids of the same steel quality within a single reinforcing element, so that the longitudinal acids may have the same cross section across all reinforcing elements.

The iron fittings of the series can be as wide as two ribs of 65-width reinforced concrete slabs for sheet-shaped building blocks

180 by 433 corresponds to a specified size (50 • -90 cm).

The following table illustrates the reinforcing elements of the braided series according to the invention as an example for a free aperture size of 2 to 6 m:

Max. Additional load

N / m ² ______

Tiling ^{Drawer Free} Ceiling Thickness

1 ^FORCE , ^arrowhead '(cm) length _(10kN size _ v> ----------- ( ^m ) / m) (m) 14 16 1820

2.40 3,572.00

2.60 4,202.20

2.80 4,952.40

3.00 5.702.60

3.20 6,602.80

3.40 7,533.00

3.60 8.493.20

3.80 9.4833.40

4.00 10.623.60

4.20 11.733.80

4.40 12.994,00

4.60 14,254.20

4.80 15,574.40

5.00 17,044.60

5.20 18.514.80

5.40 20,075.00

5.60 21,725.20

5.80 23,435.40

6.00 25.115.60

6.20 26.975.80

6.40 28.956.00

As can be seen from the table, the load-bearing capacity of the reinforced concrete element made of reinforcing elements according to the invention, in this case a slab, can be different, although the design is made solely for the tensile force due to the constant load. The load-bearing capacity can be increased by leaving the reinforcement element unchanged, for example by increasing the slab thickness. According to the table, a 2 cm increase in the slab thickness results in an increase in load-bearing capacity of 500 N / m ² . Of course, the same reinforcement elements were used for the 14, 16, 18 and 20 cm slab thicknesses in the table.

Assuming a substantially constant load and choosing the longitudinal reinforcement of the reinforcing elements according to the tensile strength depending on the span (in the prior art a quadratic equation), the same width of reinforcing elements are used for different free opening sizes, i.e. spans. The number of reinforcement elements is simply obtained by dividing the length of the slab to be made by the uniform width of the reinforcement elements. The number of reinforcement pieces shown in the table corresponds to the openings used in construction practice. Thus, using the concrete reinforcement series of the present invention, the additional cost of overlapping the reinforcing elements as well as the on-site cutting and loss of concrete reinforcement can be completely eliminated. The invention will be described in more detail with reference to the drawing. In the drawing:

Figure 1 is a perspective view of an ironing member of a concrete reinforcement series according to the invention;

Figure 2 illustrates a comparative sketch of several reinforcing elements of the concrete reinforcement series of the present invention.

As shown in Fig. 1, the reinforcing element 1 forming the unit of the concrete reinforcement series consists of longitudinal irons 2 and cross-irons 3 welded therewith. The reinforcing element 1 comprises a flat mesh portion and a support portion formed by a partially bent center portion of the cross-bars 3. Each of the longitudinal irons 2 of the reinforcing element 1 comprises 8 longitudinal irons. The longitudinal reinforcement 8 is known in the art, the torque! FIG. In the drawing, the length of the ironing element 1 is denoted by reference numeral 7.

As shown in Figure 2, each reinforcement element 1 is made for a different spacing 6. The length 7 of the reinforcing elements 1 always consists of a spacing 6 to be bridged and twice the sum of the smallest contact lengths 4. The longitudinal reinforcement 8 of each of the reinforcing elements 1 of the series according to the invention is selected for the same uniform load per surface unit.

In the present case, the reinforcing elements 1 are formed with a step size of 20 cm for a spacing 6 of 2 to 6 meters and a 25 cm step for a spacing of 6 to 8 meters. This staggering is well illustrated in Figure 2, where only one line of reinforcing elements 1 is supported on one side by a common support 5.

Thus, in the concrete reinforcement series according to the invention, the increasing tensile strength of the longitudinal reinforcement 8 of the reinforcing elements 1 can be achieved by increasing the cross-section of the longitudinal bars 2 and / or by selecting better steel grades, respectively.

Claims (5)

Patent claims 1. Concrete reinforcement series of equal-width, uniaxial load-bearing reinforcing elements (1), mainly for solid reinforced concrete slabs, wherein within the series the reinforcing capacity of the individual reinforcing elements (1) is increasing, the reinforcing elements (1) having successively increasing lengths (7), and the longitudinal reinforcing elements (8) of each reinforcing element (1) being selected for a substantially uniform, uniform load per surface unit. Embodiment of the series according to claim 1, characterized in that the length (7) of the successive reinforcing elements (1) within the series is increased by about twice the minimum length of the support (4). 180 433 Embodiment of the series according to claim 2, characterized in that the length difference between the successive reinforcing elements (1) for the spacing (2) of 2 to 6 m and for the spacing of 6 to 8 m is 25 ohm. 4. Embodiment according to any one of claims 1 to 3, characterized in that the longitudinal reinforcement (8) consists of longitudinal irons (2) of the same cross section within a single reinforcement element (1), but the longitudinal reinforcement (8) . 5. A process according to any one of claims 1 to 4 5 series, characterized in that the longitudinal reinforcement (8) consists of longitudinal irons (2) of the same steel quality within an ironing element (1), but increasingly longer steel quality longitudinal irons (2) than the individual ironing elements (1) of the series. Figure 1, Figure 2 Responsible for Sales: Director of Economic and Legal Publishing 83. 32 202 Petőfi Nyomda, Kecskemét - Chief Executive Officer: István Ablaka Director -4Fig. ) 180 433