HUT68454A - Spacer for reinforcing irons to be embedded in concrete - Google Patents

Abstract

The spacer (10) has around rod (1) to be arranged parallel to a shuttering (2) and secured to several equidistant legs (4). The legs (4) are extruded, preferably hollow thermoplastic profile sections. The legs (4) may be secured to the rod (1) by heating the rod and inserting it into the legs (4) which partially melt. The spacer (10) is very sturdy and can very easily be placed with a comparatively smaller supporting area of the legs (4).

Description

International Publication Number: 7/0 33

BACKGROUND OF THE INVENTION The present invention relates to a spacer structure for holding a concrete reinforcing mesh in a concrete structure with a rod parallel to the formwork, to which a plurality of feet of equal length are spaced apart.

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- 2 Such a spacer device is described, for example, in DE-A-32 05 35θ. In this case, the leg is bent like iron rods with plastic lugs at the end. The troughs form feet, which protect the shuttering and prevent the formation of stains and rust on visible concrete surfaces. In this spacer structure, the lugs are molded from a single piece of plastic and are press-fitted to the iron bars. Although this spacer structure has proved its worth in practice, there has been a problem that, due to extreme external conditions, the caverns may break and water can penetrate through the resulting cracks, which will of course lead to rusting. In addition, the production of this spacer structure is even relatively costly, bearing in mind that spacers need to be manufactured in very large numbers and that it is therefore particularly important that they be produced in a cost-effective and economical manner.

A spacer device known as a rod spacer is known as a formwork accessory in which the legs are splashed onto the rod. Here the legs are hexagonal and perpendicular to the pole. Due to the need to mold the legs, this spacer structure is relatively expensive. A further disadvantage is that the legs protrude above the bar when installing the spacer, which results in unnecessary painting effort and makes it difficult to place the iron.

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- 3 Another known so-called. also a spacer strip consisting of, for example, 2.5 m of plastic U-sin. This rail is placed directly on the formwork. Sint can be made from plastic at a very reasonable cost, but the difficulty here is that it provides a very long fracture site because, as is well known, plastic does not bind to concrete intimately. A further difficulty with this spacer bar is that there is a significant risk of air bubbles forming in the rail, as the concrete cannot penetrate the rail without further delay. Attempts have been made to reduce this difficulty by creating arrows in the sidewalls of the U-shaped sin. However, these arrowheads require additional machining steps, which translates into a correspondingly increased production cost.

It is then an object of the present invention to provide a spacer of the kind described at the outset, which can be produced at a very low cost, and which greatly reduces the difficulties listed above.

The object of the present invention is solved by the legs being made up of pieces of extruded profile bars.

Thus, in the spacer structure according to the invention, the legs are made up of pieces of an extruded profile bar, i.e., by cutting it apart. Since these extruded profile bars are mainly made of plastic or similar construction material at very low cost and can be easily cut from pieces of the same length, the spacer structure of the present invention can be manufactured at a significantly lower cost than the aforementioned zigzag iron bars. or concrete blocks also referred to. The rod to which the profile pieces are fastened in accordance with the invention may be a known iron rod, which of course also has a very favorable cost effect and which is also part of the reinforcing mesh or reinforcement. In addition, the spacer structure of the present invention has the advantage that the concrete can penetrate into the pieces from multiple sides, thus preventing the formation of air bubbles. Said pieces can be produced at any length without any extra work effort. The height of the spacer structure can be kept over a wide range without the need to replace the tools used for manufacturing. With the same tools, spacers of, for example, 2 cm to 40 cm in height can be easily produced.

Because the bar is kept away from the formwork along the entire length of the legs, it can safely prevent rust from forming on visible concrete surfaces. Accordingly, the reinforcement can be applied very close to the formwork, which is desirable and advantageous from a static point of view.

Since only the legs are made of plastic or similar construction material, no fracture sites are created near the visible concrete surface. In addition, since the formation of air bubbles is greatly prevented, the distance according to the invention

- With 5 support structures, the disadvantages of poor adhesion to the plastic are minimized.

The present invention will now be described in more detail with reference to the accompanying drawings, in which:

Figure 1 is a perspective view of the formwork of the spacer structure of the present invention and a detail of the reinforcing mesh;

2-7. Fig. 6A is a perspective view of a variant of the spacer structure of the present invention;

Figure 8 is a perspective view of a further detail of a reinforced mesh web;

Figures 9 and 10 show a detail of formwork with a plurality of spacer structures according to one embodiment of the invention, in perspective; finally

Figure 11 is a top view perspective view of another embodiment of the spacer structure of the present invention in formwork.

Returning to Figure 1, there is shown a conventional formwork 2 on which a spacer 10 is placed. Between the wall formwork 2 and the spacer 10, an insulating sheet (not shown) may be provided. Usually, several parallel spacers 10 (not shown) parallel to one another are mounted on the formwork 2. For example, the spacers 10 so arranged are provided with a reinforcing mesh or grid 3, which is placed everywhere on the masonry 2 and subsequently on the corresponding concrete surface. It is at distance "A". For example, this distance "A" can be cm.

The spacer 10 consists of a rod 1 of circular cross-section and a plurality of 4 legs spaced at equal intervals. The rod 1 is preferably an iron rod having a length of, for example, 2-5 m. The outer surface of the rod 1 is preferably uneven and is provided with, for example, ribs la, which are customary for such rods. The legs of the legs 4 are sections of an extruded profile bar, where this bar is made of thermoplastic thermoplastic. However, other non-corrosive plastic-like materials may also be considered. The legs 4 are obtained by cutting said extruded profile bar transverse to its longitudinal direction. The legs 4 thus have the cut-outs 4a shown in Figure 1, which are parallel to the formwork 2. The legs are U-shaped and have a hollow profile. They are accordingly cut from a U-shaped hollow prill rod. As shown in FIG. 7, the leg 4 consists of two parallel side walls 4d interconnected by a wall 4b formed thereon. The rod 1 is pivotable in the indentations 4d up 4c. . installed. The cuttings 4c are obtained by heating the rod 1 and placing it on the walls 4d with a gentle pressure and with proper direction. The temperature of the rod 1 is selected such that the rod 1 softens the wall 4d in certain regions and penetrates the wall 4d up to the position shown in Fig. 7. Rotating the rod 1 at the same time around its longitudinal axis creates a sufficiently fixed and rotation-resistant connection. · · · · Between 1 bar and 4 feet. The protruding plastic region 4e encloses the machining 4c from above and thus also contributes. for solid bonding.

As can be seen, the legs 4 are alternately arranged, i.e. oriented, which substantially increases stability relative to an embodiment where the legs 4 are in the same direction.

It is also possible to make an embodiment (not shown) in which the cutouts 4c are made, for example, by milling and the rod 1 is inserted therein. Figure 1 shows a la. Here, the ribs - the ribs - also contribute to ensuring that the legs 4 are rotationally secured to the rod 1 as desired. It is also possible to attach the legs 4 to the rod 1 in other ways. For example, the rod 1 can be glued to the legs 4. Advantageous, however, are the attachment modes in which the legs 4 are fastened to the bar 1 in a very simple and reliable manner. In the case of the above-mentioned melting of the bar 1, it is possible to connect all 4 legs to the bar 1 in a single stroke. It will also be appreciated that in this case, a sufficiently fixed connection is obtained, and therefore this connection method is particularly preferred.

As can be clearly seen in Figure 1, the legs 4 are open at the top and side so that the concrete can quickly penetrate the walls of the legs 4 and the air can escape. For example, the distance between the legs 4 is 20 cm.

Fig. 2 shows a spacer 20 with a T-shaped leg 9θ in cross-section

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- It consists of 8 and 9b walls. The legs 9 are also cut from an extruded profile bar and the cutting surfaces 9d are perpendicular to the formwork. The rod 1 is clamped in the workpiece 9c of the wall 4b or is inserted by melting the wall 9b as described above.

Figure 5 shows this spacer 50, which also consists of legs 8 having a T-section. Here, however, the walls 8a and 8b are perpendicular to the rod 1 and the formwork. In any case, each leg 8 has a circular cut-out 8c into which the rod 1 is locked or fused. The 8 feet are open on all sides but still firm.

At the spacer 40 shown in Fig. 4, the rod 1 is provided with legs 7 which are pieces of a slender profile. The cutting surfaces 7b here are preferably located parallel to the formwork. Here, too, there is a machining 7a for the rod 1.

Figures 5 and 6 show spacers 50 and 60, respectively, in which each rod 1 is connected to U-shaped feet 5 and 6 respectively. The foot 6 is supported by a horizontally positioned wall 6c on the formwork (not shown), while the side walls 6a extend vertically and are provided with a workpiece 6d for this rod. The leg 5, on the other hand, stands on the side walls 5θ · on the formwork (not shown) and the rod 1 is located in the working wall 5c of the connecting wall 5b. A particular advantage of this embodiment is that the rod 1 has a relatively long section ♦

inserted into the leg 3 and simultaneously rotated about its longitudinal axis, a molten portion 5d is formed over a long section which connects the rod 1 to the legs 5.

9 and 10 show how spacers 50 and 60 are positioned on the formwork 2, respectively. In the embodiment of Fig. 9 ·, the legs 6 have a very large footprint, which makes this design particularly suitable for insulated formwork.

In the spacer 70 shown in Fig. 8, the rod is a plastic profile rod 71. This profile bar 71 can also be produced at low cost by extrusion and is thermoplastically connected to the legs 4. The profile 71 can also be bonded to the legs 4 or welded or ultrasonically bonded. Since it is made of 70 spacers made of extruded rods, it is considered a very inexpensive option.

If there is only a small amount of space available on a formwork to set up the aforementioned spacers, such as a corner or balcony, the spacer 80 shown in Figure 11 may be better used. It has a double bend of approx. It consists of a U-shaped rod 81, to which 4 legs are fastened as described above. The spacer 80 can be easily made from the spacer 10 of Fig. 1, while still having access to the rod 81.

Depending on the use, the middle section 81b9 · 4 9 ♦ • ·················································

Also, a leg other than the rod 31 may be disposed on deflected sections 81a. These 80 spacers can be produced at a very tedious cost and are also very stable ································································ ·

- 11 Patent claims

Claims (10)

Claims 1. Spacer structure for concreting a reinforcing mesh / 3 / with a rod / 1 / parallel to the formwork / 2 / on which several feet (4-9) are fixed, characterized in that the feet / 4-9 / extruded profile rod pieces. Spacer according to Claim 1, characterized in that the legs are / 4-9 / extruded hollow profile bars. Spacer according to Claim 1 or 2, characterized in that the legs have a U-shaped cross-section. 4. Spacer according to any one of claims 1 to 4, characterized in that the longitudinal direction of the legs / 4-9 / is in the direction of the bar / 1 / cross. 3. Spacer according to any one of claims 1 to 3, characterized in that the rod / 1 / the feet / 4, 5, 6, 8, 9 / are mounted on its side walls / 4d, 5θ> 6a, 8b, 9d /. 6. Spacer according to any one of claims 1 to 4, characterized in that the legs (4 to 9) have a working (4c, 5c, 6d, 7a, 8c, 9c) into which the rod (1) is snapped, locked or fused. 7. Spacer according to any one of claims 1 to 4, characterized in that the legs are made of thermoplastic thermoplastic material and are connected thereto by melting the rod 1 / a legs 4-9. Spacer according to Claim 1, characterized in that the legs (8, 9) have a T-shaped cross-section. 9. Spacer according to any one of claims 1 to 3, characterized in that the legs / 4 / alternate directional agua k with respect to the bar / 1 / Spacer according to Claim 1, characterized in that the rod / 1 / is a plastic profile rod / 71 /.