CH641518A5 - Process for producing an anchoring used as a reinforced-concrete connection - Google Patents

Description

The invention relates to a method for producing an anchoring serving as a reinforced concrete connection, consisting of several reinforcing steel bars, in which each reinforcing steel bar is initially bent approximately at right angles to form a part to be concreted into a main wall and a part to be bent out after concreting, after which the parts to be bent out the reinforcing steel bars are placed close together and the parts of the reinforcing steel bars to be concreted are placed at the desired distances from each other.

In order to be able to rationally connect concrete partition walls, concrete stairs or intermediate floors to a main concrete wall, it is known according to Swiss Patent No. 562 376, the reinforcing steel bars that have been bent at right angles and of which one part fits into the The main wall to be concreted and the other part forms two exposed legs that have to be bent out after concreting, to be laid with their exposed legs in a channel-like shell and covered with polyurethane foam. The solidified foam then forms a mass that holds the legs.

In order to be able to bend the legs out of this mass after concreting the stirrups, they have to be scraped out, which is tedious and time-consuming. In addition, the manufacturing costs are quite high.

It is the object of the invention to propose a method for producing an anchoring serving as a reinforced concrete connection and consisting of a plurality of reinforcing steel rods, in which the parts of the reinforcing steel rods which are to be bent out can be bent out easily and without loss of time after the other parts of the reinforcing steel rods have been completely concreted. The manufacturing costs of such anchoring should be kept low compared to other known manufacturing processes.

According to the invention, this object is achieved in such a way that the reinforcing steel bars bent at right angles are held in a bundle and that a thermally deformable plastic film is attached and treated with heat via the parts of the reinforcing steel bars to be bent out from the side opposite the parts to be concreted and treated until it lies tightly against the parts to be bent out and partially encloses it like a clip, after which the film is subjected to a shock-like cooling.

The anchorage produced in this way is easy to transport.

The heat treatment of the plastic film is advantageously carried out by hot air jets specifically directed at the sections of the film covering the parts of the reinforcing steel rods to be bent out.

The invention is explained in more detail below with reference to the drawings, for example. Show it:

1 shows a cross section of a bundle of reinforcing steel bars arranged on a magnetic plate with a film resting on them,

2 is a plan view of the same,

Fig. 3 shows a cross section of parts of the anchoring rods to be bent out, which were spot welded together.

The anchoring serving as a reinforced concrete connection consists of several reinforcing steel bars 5 which have been bent at approximately 90 ° to form a part to be concreted into the main wall and a part to be bent out after the anchoring has been concreted. Each reinforcing steel rod is advantageously bent into a bracket, after which the two bracket legs 5b are bent approximately at a right angle from the bracket web 5a. However, it is also possible for each reinforcing steel rod 5 to be bent only at a right angle, no bracket being formed; in this case two rows of reinforcing steel bars 5 are used.

The reinforcing steel bars 5 are put together to form a bundle, the parts of the reinforcing steel bars to be bent out lying close together and the parts of the reinforcing steel bars to be concreted being arranged at the desired distances from one another. In order to hold the bundle consisting of reinforcing steel bars, the parts of the reinforcing steel bars 5 to be bent out are placed on a magnetic plate 1 which has slots 6 into which the parts of the reinforcing steel bars to be concreted are inserted. The parts of the reinforcing steel rods 5 to be bent out are lined up closely together. The magnetic plate 1 is energized in order to hold the parts of the reinforcing steel rods 5 which are to be bent out.

In order to hold onto the bundle formed from the reinforcing steel rods, a welding process can be used instead of the magnetic plate, in which the two are close together

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parts of the reinforcing steel bars that are to be bent out are spot-welded to one another in order to hold them together. A thermally deformable plastic film 3 is then attached over the parts to be bent out of the reinforcing steel rods 5 held in this way in the bundle from the side opposite the concrete parts of the reinforcing steel rods. The plastic film is preferably a PVC film which has a thickness of at most 2 mm. It is arranged at a distance from the surface of the parts of the reinforcing steel bars 5 to be bent out or is placed directly on the parts to be bent out. The plastic film 3 is treated with heat until it lies tight against the parts to be bent out and partially encloses it. When the film 3 partially encloses the parts to be bent out, a clip effect must occur so that the film sits immovably on the parts of the reinforcing steel bars to be bent out during transport. Accordingly, the film 3 is subjected to a shock-like cooling.

The heat treatment of the film 3 can be carried out in various ways. This is most advantageously done by hot air jets directed specifically at the sections of the film 3 covering the parts to be bent out. The application of the film 3 to the parts of the reinforcing steel rods 5 to be bent out can also be caused by heat radiation, e.g. done by resistance heating elements. It can be infrared rays. The film 3 can be adapted to the parts to be bent out by a counter-pressure plate 8 during the heat treatment.

The process steps according to FIG. 1 will now be explained in more detail. The plastic film 3 is placed on its edges on an immobile 2 and a movable 2a base and held down by means of hold-down device 4. Depending on the desired width of the film 3, the movable base 2a can be moved laterally in the direction of arrow A. Due to the targeted hot air jets, the film 3 becomes

Brought to the parts of the reinforcing steel rods 5 to be bent. Depending on the distance of the film 3 from the surface of the parts to be bent out at the beginning of the heat treatment, there are various high legs (see s the full line of the film), which come into contact with a formwork board (not shown) when concreting, so that between the formwork board and Anchoring creates a cavity. If the distance between the two rows of the parts to be bent out is too large, a further base 7 can be provided between the two rows, so that the film 3 lies against it during the heat treatment and there is a support shaped in the height of the legs.

Accordingly, the film formed in this way is cooled in a shock-like manner by cooling air 15, so that it solidifies in this form. It is quite possible that a vacuum can still act on the other side of the film 3 from the magnetic plate 1.

Perforations can be provided on both sides of the sections of the film to be bent onto the parts of the reinforcing steel rods 5. Instead of the perforations, tear wires can be provided at these points. The film 3, which is torn off from the parts to be bent after the parts of the reinforcing steel rods 5 to be concreted, can be removed better and faster from the parts to be bent out in the perforations or when using the tear-off wires.

The manufacturing costs of the anchoring produced in the process steps described above are much lower than for the manufacture of the known anchors of this type. The bundle consisting of the reinforcing steel bars with the film lying thereon can be transported without any problems. After concreting has been completed, the film can be torn off along the entire length of the 35 bundles concreted in with a single crack and removed from the parts to be bent out.

1 sheet of drawings

Claims (7)

641518 PATENT CLAIMS 1. A method for producing an anchoring serving as a reinforced concrete connection, consisting of several reinforcing steel bars, in which each reinforcing steel bar is initially bent approximately at right angles to form a part to be concreted into a main wall and a part to be bent out after concreting, after which the parts to be bent out the reinforcing steel bars are placed close together and the parts of the reinforcing steel bars to be concreted are placed at the desired spacing from one another, characterized in that the reinforcing steel bars are held in a bundle and that the parts of the reinforcing steel bars held in the bundle are bent from the side opposite the parts to be concreted via the parts to be bent out thermally deformable plastic film is applied and treated with heat until it lies tightly against the parts to be bent out and partially encloses it like a clip, after which the film is subjected to a shock-like cooling. 2. The method according to claim 1, characterized in that the closely spaced parts to be bent are placed on a magnetic plate, which is energized to hold the parts to be bent together. 3. The method according to claim 1, characterized in that the closely lying parts to be bent are spot welded together to hold them together. 4. The method according to claim 1, characterized in that the heat treatment of the film is carried out by hot air jets directed at the portions of the film covering the parts to be bent out. 5. The method according to claim 1, characterized in that the heat treatment of the film is carried out by heat radiation. 6. The method according to claim 5, characterized in that the heat treatment of the film is carried out by infrared rays. 7. The method according to claim 1, characterized in that the film is held stationary during the heat and cooling treatment at its edges above the surface of the parts of the reinforcing steel bars to be bent out.