EP1046752B1 - Ground anchor - Google Patents

Description

The invention relates to a foundation anchor according to the preamble of claim 1.

For anchoring or securing buildings and Components in the floor, among other things Foundation anchor used where steel strands or cables around suitable deflection elements be performed. These arrangements are in holes introduced, the holes grouted with cement mortar and prestressed the steel strands. After use, the Strands or cables are pulled out so that only one small amount of metal remains in the ground.

A foundation anchor of this kind is in EP-A-577 421. However, this solution is relatively complex in the manufacturing process as they are specially designed prepared deflection elements required.

In US 3,650,112 anchor elements for fastening flexible traction elements Tension element in a U-shaped, placed around a deflection element Pipe is guided, which with the deflecting element is welded.

It is therefore the task of one To provide foundation anchors of the type mentioned at the beginning, which is easy to manufacture and which is nevertheless high Can absorb forces.

This task is performed by the foundation anchor Claim 1 fulfilled.

According to the invention, each deflecting element thus at least one U-shaped, rod-shaped Steel element made of reinforcing iron. The steel element is connected to the deflecting element, e.g. by welding. At least one flexible is around the deflecting element Tension element placed.

In contrast to known solutions, it can any deflecting element used, its ability improved for force absorption by the steel element becomes.

Since steel elements (e.g. reinforcing bars) and suitable welding systems available on every construction site are the preparation of such components Problems. In addition, there are the U-shaped steel elements to lie outside on the foundation anchor, so that they the thrust forces occurring efficiently in the adjacent ones Can pour cement mortar and floor.

The deflecting element is preferably a half cylinder made of metal, as it is easily made from a halved round bars can be made.

In a preferred embodiment, each Deflection element two reinforcement bars placed between which is guided at least one tension element. So serve the reinforcing iron as a force dissipation, but also for guiding the tension element.

To get the highest possible traction and a good one To achieve force distribution, several deflection elements can be used be arranged one after the other, with each Deflection element at least one tension element and a steel element is placed. To make the most efficient use of space and to achieve even force distribution, can be turned against each other be arranged.

In a preferred embodiment, the Foundation anchoring a metal tube, which axially at least over the area of the deflection element or elements extends. The metal tube is preferred corrugated in the transverse direction so that it is good after longitudinal forces can transmit outside.

The foundation anchor can be made by halving a round bar to serve as a deflecting element to serve. Then bent steel element on the round bar welded. These steps can all be done on the Construction site with existing tools and materials be performed.

Fig. 1 eine Ansicht des unteren Endes einer bevorzugten Ausführung des Gründungsankers,

Fig. 2 eine Endansicht des Gründungsankers aus Richtung A von Fig. 1, wobei unterhalb der Zeichenebene liegende Armierungseisen und Litzen nur teilweise dargestellt sind,

Fig. 3 - 6 Schnitte durch den Gründungsanker entlang den Linien B-B, C-C, D-D bzw. E-E von Fig. 6, wobei unterhalb der Zeichenebene liegende Armierungseisen und Litzen nur teilweise dargestellt sind,

Fig. 7 eine vergrösserte Ansicht von Fig. 3 und

Fig. 8 eine vergrösserte Ansicht der Spitze von Fig. 1.

Further preferred features of the invention emerge from the dependent claims and from the description which now follows with reference to the figures. Show:

1 is a view of the lower end of a preferred embodiment of the foundation anchor,

FIG. 2 shows an end view of the foundation anchor from direction A of FIG. 1, reinforcing bars and strands lying below the plane of the drawing being only partially shown, FIG.

3 - 6 sections through the foundation anchor along the lines BB, CC, DD and EE of FIG. 6, with reinforcing bars and strands lying below the plane of the drawing being only partially shown,

Fig. 7 is an enlarged view of Fig. 3 and

8 is an enlarged view of the tip of FIG. 1st

The basic structure of a preferred embodiment the foundation anchor is shown in Figs. 1-7. This Figure shows only the lower one, i.e. earth end of Foundation anchor. This end rests in a hole 1 that is grouted with cement mortar. The mortar fills everyone Cavities inside and outside the anchor.

Extend through the foundation anchor overall three U-shaped bends that serve as tension elements Strands 2, 3, 4, each in a plastic sheath is arranged so that it is later pulled out of the anchor can be. The task of these strands is that Forces from the top of the anchor, i.e. from the tension point, to transfer to the lower end.

Each strand is in a U-shaped loop each placed around a deflection element 6, 7, 8. The deflection elements are massive half cylinders in the present version made of metal, the curved side of which is at the bottom.

Around each deflection element 6, 7, 8 are also two reinforcing bars 9a, 9b, 10a, 10b and 11a, 11b, respectively. The reinforcing bars 9a, 9b, 10a, 10b and 11a, 11b are U-shaped, rod-shaped steel elements, whereby the two legs are parallel to the longitudinal axis of the anchor from the deflection elements in the direction of the upper anchor end extend. The curved part of the reinforcing iron lies on the curved surface of the respective deflecting element and is welded to it (see FIG. 7).

The task of the reinforcing iron is part of the forces acting on the deflection elements record and transfer to the environment.

7, in particular the reinforcing bars are spaced from each other. This distance is dimensioned so that the respective Strand 2, 3, 4 finds place, i.e. the reinforcing bars form side guides for the strands so that they cannot slide off the deflection elements.

The three deflection elements 6, 7, 8, the three Strands 2, 3, 4 and the reinforcing bars are against each other each rotated by 120 °. This creates the space in the hole 1 better used and the forces become even distributed.

The lowest reinforcing bars 9a, 9b are shorter than the top reinforcement bars 11a, 11b, this because the upward forces are increasing.

In a preferred embodiment, the foundation anchor is equipped with a tube 12 that from lower anchor end at least over the three deflection elements or even extends to the top of the anchor. The pipe 12 consists of metal, preferably steel, and has, as shown in Fig. 8, one in the longitudinal direction substantially sinusoidal wavy coat. It it turns out that such a coat is able also high forces in the surrounding mortar and soil derived without damaging the Rohrs is coming.

The tube 12 straps the deflection elements and thereby acts on the radial forces and their Counter explosive effect. It stabilizes the foundation anchor in the longitudinal direction, causes an even distribution of the thrust and serves to maintain the maximum Anchor diameter.

The pipe ensures that the Anchor is approximately centered in hole 1 and on all sides surrounded with a sufficiently thick mortar coat is.

The foundation anchor according to the present version can be made in a simple manner. The Deflection elements 6, 7, 8 are halved in length Round bars made and welded with the reinforcing bars. Then the strands 2, 3, 4 over the deflection elements placed and the three deflection elements are in the tube 12 inserted. The foundation anchor thus completed can now be pushed into hole 1 and with mortar be pressed. Then the strands are at the top of the anchor biased.

Claims (10)

1. Ground anchor having at least one flexible tension element (2, 3, 4), which is guided around at least one deflecting element (6, 7, 8), characterized in that around the deflecting element (6, 7, 8) at least one rod like steel element (9a, 9b, 10a, 10b, 11a, 11b), which is bended to an U-shape and is connected with the deflecting element (6, 7, 8), is laid, which is a reinforcing steel.
2. Ground anchor of one of the preceding claims, characterised in that around the deflecting element (6, 7, 8) at least two steel elements (9a, 9b, 10a, 10b, 11a, 11b), which are bended to a U-shape, are laid, between which the tension element (2, 3, 4) is arranged in such a manner that the steel elements (9a, 9b, 10a, 10b, 11a, 11b) form lateral guidances for the tension element (2, 3, 4).
3. Ground anchor of one of the preceding claims, characterised in that the deflecting element (6, 7, 8) is a half cylinder formed of metal.
4. Ground anchor of one of the preceding claims, characterised in that the at least one steel element (9a, 9b, 10a, 10b, 11a, 11b) is welded together with the deflecting element (6, 7, 8).
5. Ground anchor of one of the preceding claims, characterised in that it comprises several deflecting elements (6, 7, 8) located one after another and several tension elements (2, 3, 4), wherein around each of the deflecting elements (6, 7, 8) at least one steel element (9a, 9b, 10a, 10b, 11a, 11b) is laid.
6. Ground anchor of claim 5, characterised in that the reinforcing steels (9a, 9b), which are located at a lower end of the ground anchor, are shorter than reinforcing steels (11a, 11b) which are located at a higher position.
7. Ground anchor of one of the claims 5 or 6, characterised in that the deflecting elements (6, 7, 8) are twisted against one another.
8. Ground anchor of one of the preceding claims, characterised in that it comprises an enveloping tubing formed of metal, which extends at least over the at least one or over the several deflecting elements (6, 7, 8).
9. Ground anchor of claim 8, characterised in that the tubing is corrugated in longitudinal direction.
10. Method of manufacturing a ground anchor according to one of the preceding claims, characterised in that a round steel bar is cut into halves for manufacturing the deflecting element (6, 7, 8) and that bended, rod like steel elements (9a, 9b, 10a, 10b, 11a, 11b) are welded to the round steel bar.

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