DE1273782B - Process for the production of bow-shaped spacers for the upper reinforcement of concrete slabs - Google Patents

Description

Process for the production of bow-shaped spacers for the upper reinforcement of concrete slabs in continuous, especially flat reinforced concrete structures, z. B. reinforced concrete slabs are used to cover the bending moments and other forces below-. and overhead reinforcement inserts required. These deposits must be laid extremely precisely, as even small deviations significantly increase the load-bearing capacity can affect.

The invention is concerned with spacers, which the location of the to secure the upper reinforcement of flat concrete structures.

Spacers of this type are on. known. Your making is but quite complex. So must in a known manufacturing process this Spacer the raw material, the wire rod, go through the following operations: 1. The rolled up wire rod is descaled and drawn so that the following Welding is possible.

2. The drawn wire is straightened and cut into bars.

3. The cut straight wire is welded to form grids.

4. These grids are cut into strips.

5. The strips are bent into baskets of which there are so many included by individual spacers.

6. Usually only at the construction site - the baskets are then used by construction workers divided into individual spacers.

For each of these operations there is at least one special one Tool needed.

The other known manufacturing processes have similar operations necessary.

Also the so-called "duck feet" or "pig's ears" that are often used (see Fig. 1) are very expensive to manufacture. They are predominantly made out though Reinforcing steel scraps are made, but their individual production is by hand with the ever increasing wage costs extremely uneconomical.

According to the invention it is now proposed that a reinforcing bar formed a helical structure by repeated, approximately right-angled bending and that the straight rod sections on one side of the helical structure be severed in the middle or that the helical structure after five straight rod sections is severed at bending points or that from one Reinforcing bar a structure with a U-shaped cross-section is bent, in which the reinforcing bar continuously in the longitudinal direction horizontally, then vertically, then at the top in the transverse direction horizontally, then vertically downwards and again in the longitudinal direction, and that the longitudinal rod sections are severed in the middle.

The economic advantages in manufacturing are surprising.

The continuous rod structures according to the invention can be, for. B. produce from a roll of wire rod in one operation. There is only one for this Machine required.

Because reinforced concrete slabs are increasingly used in residential buildings installed and thus the need for spacers annually in the millions goes, the cheaper production option is particularly economic Meaning.

The following additional advantages underline the usefulness: 1. Production can be carried out with the bending machines available in almost every iron bending shop today be made.

2. The continuous rod structures can be nested and so be stored and transported.

3. With a square shape, spacers can be used for can be cut for the respective purpose with feet of different lengths, such as the F i g. 5 and 6 show, depending on whether they are in the middle of the field (FIG. 6) or in the corners (Fig. 5) can be cut.

4. If the rod structure is not made square, but rectangular, this way, two spacers of different heights can be cut from a rod structure, like the fig. 7, 8 and 9 show. The rod structures according to the invention, for further processing as a spacer, - can also be improved by a) that they are made from ribbed rods, so that the reinforcing bars to be held up = do not slip off; b) that the rod structure with Notches are provided (see F i g.10), so that the production of the individual Do not cut the spacer with e.g. B. must be done with a bolt cutter, but can be done by breaking it off by hand; c) that they are in a dye bath or be protected against rust by plastic sintering.

Further: details = the invention .are evident from the figures, -.

F i g. 1 shows a so-called "duck foot" (or a so-called "Pig's ear"), where b denotes the support height, a the footlank; F i G. FIG. 2 shows an improved shape compared to FIG. 1, where a and b are analogous to the dimensions correspond to the execution according to Fig. 1 ;.

F i g. 3 shows a continuous rod structure from the spacers in FIG. 1; where c denotes the intended interfaces between the individual spacers; F i g. FIG. 4 shows a continuous rod structure made up of spacers from FIG. 2; d are the interfaces to obtain long feet and e are the interfaces to obtain short feet; F i g. 5 shows two separate spacers according to FIG. 2. with long feet; ". -Fig. 6 shows two spacers according to FIG. 2 with short feet; FIG. 7 shows a continuous rod structure with different side lengths f and g and the corresponding interfaces h and i; FIG. Fig. 8 shows a spacer according to Fig. 7 with the height f when cutting at the intersections i; Fig. 9 shows a spacer according to Fig. 7 with the height g when cutting at the intersections h; Fig. 10 shows a continuous rod structure with notches k for cutting by hand.

Claims (6)

Claims: 1. Method for producing bow-shaped spacers for the upper reinforcement of concrete slabs, characterized in that from one Reinforcing bar becomes a helical one through repeated, approximately right-angled bending Structure is formed and that the straight rod sections on one side of the helical The structure is severed in the middle (Fi g. 7, 8 and 9). 2. Method of manufacture of bow-shaped spacers for the upper reinforcement of concrete slabs, thereby characterized in that from a reinforcing bar by repeated, approximately right-angled Turning a spiral-like structure is formed, which every five straight Rod sections @ is severed at turning points (F i g. 4 and 5). 3. Procedure for the production of bow-shaped spacers for the upper reinforcement of concrete slabs, characterized in that a reinforcing bar is made of a U-shaped cross-section Structure is bent, in which the rebar is continuously horizontal in the longitudinal direction, then vertically, then horizontally above in the transverse direction, then vertically downwards and again is guided in the longitudinal direction, and that the longitudinal rod sections are centered be cut through (Figs. 1 and 3). 4. The method according to any one of claims 1 to 3, characterized in that the reinforcing bar at the intended separation points notched so that it can be broken off by hand at the notched points (F. i g.10). 5. According to the method. According to claim 1, 2 or 4 produced helical Structure, characterized in that the straight rod sections are of equal length. 6. According to the method according to claim 1, 2 or 4 produced helical structure, characterized in that the straight rod sections are of different lengths.