HU209171B - Pre-assembled steel insert - Google Patents

Abstract

The invention relates to a prefabricated steel insert group for the production of reinforced concrete plates and/or shells, which comprises reinforcing inserts, such as main steel inserts or distribution inserts, cut to a desired size and optionally bent, each reinforcing insert being assigned to only one load-bearing direction of the plate. The reinforcing inserts, which may have different diameters, are spaced at a distance adapted to the load, and the flexible connecting threads, which allow the insertion group to be coiled, may form a flat mesh. It is characterized in that the flexible lacing threads (2) are loosely attached to the reinforcing inserts (1), and the reinforcing inserts (1) are only attached by means of fasteners suitable for preventing them from moving apart, e.g. clips (8) or pieces of wire (9).

Description

FIELD OF THE INVENTION The present invention relates to a group of prefabricated steel inserts for the production of reinforced concrete plates and / or shells comprising cut and optionally bent reinforcing inserts, such as main reinforcing inserts or distributor inserts.

During the construction of reinforced concrete structures state-of-the-art formwork methods and high-performance concreting technologies were developed. However, the improvement and acceleration of the on-site reinforcing steel assembly is still unsolved.

Reinforcing steel assembly work requires a great deal of meticulous live work, most of which is often done outdoors, not infrequently in adverse weather conditions. As a result, the construction process of reinforced concrete structures is usually slowed down by the reinforcement of steel reinforcement, and therefore, the benefits of more advanced processes used in other work stages are not realized.

Many attempts have been made to accelerate the reinforcement of reinforcing steel, which hinders the construction work of reinforced concrete structures. Starting with the need to reduce the amount of on-site work, welded nets are widely used.

Welded nets are made of reinforcing steel fibers crossed at right angles to each other. The diameter, distribution and board size of the reinforcing steel fibers are knit and can be ordered according to the catalog. The layout and board size vary in specific steps according to module size.

However, the use of welded nets has several disadvantages. The fact that the nets are only available at certain steps in terms of reinforcing steel diameter and fiber spacing, will inevitably lead to an oversize of the structure or to the necessity of installing a large amount of spot iron. It may also be necessary to apply two layers of nets, which reduces the useful structural height and is therefore unfavorable for internal power play.

At the joints of the boards, the meshed fibers stacked on top of each other have a high structural height.

Wires of welded nets always intersect at right angles, which means that a cross-section of a welded net, e.g. can not be created for the installation of slanted bridge plates, or only with considerable surplus. They are unsuitable for radial and perimeter ironing of round plates, for ironing broken or curved plates, shells only in some cases and they are difficult to use. By using warehouse type nets, tailoring is inevitable. Cutting is a cumbersome operation requiring a target machine.

The disadvantages of using welded nets have been addressed by numerous solutions. Most of them consist of a pre-welded but custom-made mesh.

They include eg. Swiss Patent Application No. 393 962. In this case, the so-called length of the plate is adapted to the support of the plate structure. a basic mesh is used, on top of which is laid a reinforcing mesh of smaller length. The brace torque diagram thus encapsulates the torque diagram relatively accurately with the required safety.

The disadvantage of the principle, which is theoretically correct, is that it is difficult to track changes in the corresponding stresses with distributor deposits. It is also unfavorable that moving the nets and creating openings is cumbersome.

The Hungarian Patent No. 174991 discloses a good solution. With the very simple idea of placing the main iron inserts at the bottom and top of the plate mesh at both the bottom and the top of the plate, it provides the option of placing additional iron in the direction of the main application. The price of the simple solution is the reduction of the torque, which is the consequence of the opposite positioning of the iron inserts.

A further disadvantage of the invention is that both the main irons and the distributor irons can only be inserts of the same diameter and the auxiliary irons must be straight.

All these limitations diminish the positive effects of the benefits of the solution.

Hungarian patent specification No. 188,444 also attempts to realize welded mesh yet economical sheet ironing. Sheet ironing here is made up of base nets and additional inserts, which can be nets themselves. The core nets are omnidirectional or divergent and are strip shaped so that the amount of reinforcing steel corresponding to the demands can be more accurately tracked than the uniform mesh distribution.

The disadvantage of this solution is that it only slightly reduces the faults in welded mesh ironing, and only one of them improves the standard over-ironing. On the other hand, however, there is the possibility of failures that are inevitable when installing multiple mixed meshes on site.

German Patent Application DE 2 825 160 is also noteworthy. Here, the welded mesh is inserted between mine supports to hold the backfill, with the idea that the long irons are embedded in the backfill itself, thereby reinforcing it. Between the longitudinal and transverse inserts of the net there is a narrow hole, e.g. it is rabid, it gives the concrete formwork.

In one embodiment, the transverse irons are replaced by a set of metal strips and a large mesh wire mesh, which encircle the longitudinal iron, whereby the two types of mesh can be wound together with the metal strip and the longitudinal iron.

In addition to the fact that only rectangular reinforcements can be assembled with this solution, it is also disadvantageous that the metal strip and wire mesh replacing the cross-irons can have only a limited cross-section. If, on the other hand, the cross-sections are small, due to their reelability, the mine supports must be thickened. It is obvious, therefore, that in the construction industry, where the position of the supports is not determined by the capabilities of the distributor inserts, the solution described is not appropriate.

The solution disclosed in DE 2016225 is also used in the mining industry. The longitudinal iron inserts here to each other

EN 209 171 Β wide steel strips connected by a gap, the latter acting as a distribution iron and formwork at the same time.

Since the reinforcement thus formed does not provide a way of forming concrete coverings, it is necessary to consider the corrosion of steel within a short period of time. The application of the solution in the mine may be justified and economical, but it is totally unsuitable for structural purposes and for facilities with a long life.

Fogarasi-Adamik: Welded reinforcing steel frames (MK 1976.) c. XIII. Chapter 2, p. 224, provides information on wound nets permitted in Soviet practice. They have a diameter limit of 5.5 mm and are not suitable for general use.

They also have the disadvantage that they can only be rectangular reinforcement, and that the shape, diameter and distribution of the irons is bound, so the strain is not able to follow changes.

It is an object of the present invention to provide a method of forming reinforced concrete slabs or sheet-like structures and shells in which the reinforcing steel assembly process follows the rest of the operations without hindering them. The task here is to ensure that the reinforcing steel assembly can be prefabricated in a workshop, the amount of reinforcing steel is appropriate to the changes in the load over time and does not result in additional use. Make it possible to choose both the reinforcing steel diameters and the layout. Ultimately, the goal is to avoid on-site live work and allow for the construction of a slanted reinforcing steel mesh and nailing.

The inventive idea is based on the realization that prefabricated reinforcing steel assemblies can be prefabricated and easily installed on site, and that the amount of reinforced reinforcing steel installed is exactly the same as when the mesh is divided into two halves. In other words, the final mesh is made in two parts, bound together with reinforcing steel fibers in the same load-bearing direction, and thus delivered to the site. Each half mesh contains the main iron inserts, or divider inserts, or one-way inserts of the load-bearing plate.

It is also part of the realization that the interconnecting members of the reinforcing steel strands of the mesh only play a temporary role during transport, in that they must prevent the reinforcing steel from being removed from one another and do not affect the final rigidity of the structure. As a result, it is possible to hold the individual reinforcing steel strands together in a loose, articulated manner. The resulting mesh can be wound, easily transported and rolled into the form space.

In accordance with the object of the present invention, the pre-assembled insert assembly for the production of reinforced concrete plates and / or shells comprising cut and optionally bent reinforcing inserts, such as reinforcing inserts or splits, is assigned to only one load bearing direction of the plate reinforcing inserts of different diameters are spaced according to the strain, and the flexible staples that allow the bundle to be wound together form a flat mesh - so that the flexible staples are only loosely attached to the reinforcing inserts, e.g. fastened by means of staples, wire pieces.

A further feature of the pre-assembled steel insert group of the present invention may be that the flexible staple fibers are loosely attached to the reinforcing inserts, but only fasteners to prevent the reinforcing inserts from moving apart. fastened by means of staples, wire pieces.

The steel insert group pre-assembled according to the invention has several advantages.

The stresses of the structure can be flexibly followed by a set of individual requirements. There is no need to adjust to the warehouse range, multiple joints, no tailing waste, so the structure is much more economical than before.

It can be pre-assembled in the plant, easily rolled into the form space by rolling, so on-site live work is reduced to a minimum and construction speed is accelerated. Until now, problems with pre-assembled concrete steels, eg inclined plates, radial reinforcement can also be solved.

Ironing intensity, iron diameters, spacing distances can be arbitrary or even variable. By compression, even concealed beams can be formed, the structural height can be utilized at full height, which leads to further savings. Falling waste material may also be used as a fastener.

The bundled insert assembly is easy to transport to tight spaces, eg. in case of reconstruction works, slab replacement can be simply delivered to the site, so it can be used in places where the welded mesh is unusable due to the size. The rolls are movable by hand and fit in a small space.

The invention will now be described in more detail with reference to the accompanying drawings. Figures 1a-ld are examples of the design of the insert, Figures 2a-2e are the finished mesh extended, wound and then laid in the shape space, Figures 3a-3c are non-rectangular nets.

According to Fig. 1a, the reinforcing inserts 1 are joined by the flexible staple fibers 2, and the inserts 1 are fastened by a wire piece 9, preferably a binding wire, to the flexible staple fibers 2.

In the figure below, the role of the flexible corset thread 2 connecting the reinforcing inserts 1 is that of the strap, the role of the coupling element is the clamp 8.

A further example is shown in Figure ld. Here the reinforcing inserts 1 are mounted on a thin plane 6.

The top view shows the assembled insert group 3 in the figure below. The symbolically marked connection between the reinforcing pads 1 and the flexible staples 2 is shown.

The insert group 3 shown in Fig. 2a differs from the previous one in that besides the reinforced reinforcing inserts 1 and the flexible corset threads 2,

EN 209 171 Β, including a sufficient number of 11 spare irons.

In Figures 2b and 2c, the same insert group 3 is shown in a rolled up state ready for delivery. The reinforcing inserts 1 and the auxiliary irons 11 are fastened to the same flexible staples 2.

Fig. 2d shows the two insert groups 3, which are substantially perpendicular to one another and are placed in a space not marked on the drawing, ie in their final position. Each set of pads 3 is composed of reinforcing pads 1 and flexible staples 2. In addition, one of the insert groups 3 further comprises 11 additional irons.

In Fig. 2e, the two sets of inserts laid in the mold space 5 consist of reinforcing inserts 1 and flexible staples 2. They are rolled perpendicular to the mold space 5 and assembled there by means of spacers and other auxiliary means, not shown. In Fig. 2e, the plate 10 is completed by incorporating the curing mixture. The plate 10 has only a bottom reinforcement for field torque.

3a, e.g. there are 3 inserts groups forming a radial reinforcement of a circular slab. The reinforcing inserts 1 and the auxiliary irons 11, which serve to reinforce the main reinforcement, are held together by annular flexible staples 2.

The same can be seen in the roll 5 when it is wound into its mold 5 before being rolled in Fig. 3b.

Finally, Fig. 3c shows a group of inserts 3 in which the direction of the main reinforcement, i.e. the reinforcing inserts 1, forms an angle other than a right angle. One of them also has 11 spare irons. Flexible staples and fasteners are not shown here.

One of the load-bearing elements of the reinforced concrete structure is fixed transversely on the auxiliary assembly bench. The anchorage is primarily a spacer. The fastener is rope-like, e.g. tape, cord, wire, reinforcing bars do not let go, but flexible. After completing the junction joints, the assembled reinforcing steel fiber row can be rolled up in a carpet-like manner and stored and transported in a cylindrical condition. On-site iron fitting only from roller unloading and additional elements, eg. consisting of riders, fittings, fittings. Then the bound steel fibers can no longer move. Prefabricated iron fitting in the formwork is now in place with precision.

The upper ironing of the plate, after placing the lower two halves, can be similarly laid. Two auxiliary bars or spacers can be used for this operation.

The group of inserts according to the invention can be used in the construction of reinforced concrete slabs and shells for the installation of on-site or prefabricated reinforcing steel. It is particularly useful in case of large-scale formwork, mechanized concreting, as well as in the reconstruction of existing buildings, replacement of ceilings and work in tight spaces.

Claims (1)

Prefabricated steel insert group for the production of reinforced concrete slabs and / or shells comprising cut and optionally bent reinforcing inserts, such as main iron inserts or distributor inserts, each reinforcing insert being assigned to only one load bearing direction of the sheet, reinforcing inserts having different diameters are spaced apart, the flexible staples allowing the netting of the insert group to form a flat mesh, characterized in that the flexible staples (2) are loosely bonded to the reinforcing inserts (1), . They are fastened by means of clamps (8), wire pieces (9).