EP2350409A1

EP2350409A1 - Method for producing a screw foundation

Info

Publication number: EP2350409A1
Application number: EP09736405A
Authority: EP
Inventors: Stephan Reisch
Original assignee: TERRAFIX GmbH
Current assignee: TERRAFIX GmbH
Priority date: 2008-11-13
Filing date: 2009-10-09
Publication date: 2011-08-03
Also published as: US20110250977A1; MX2011005065A; AU2009315881A1; DE102008043709A1; WO2010054902A1; CA2743919A1

Abstract

A method for producing a screw foundation (1) for anchoring building parts or structures in the ground, comprising the following steps: providing a tubular starting material (10) with a required length, laying a free end (12) of the tubular starting material (10) between at least two shaped elements (20), securing the tubular starting material (10) in its longitudinal direction, compressing the free end (12) of the tubular starting material (10) by moving together the at least two shaped elements (20), with the result that an at least partially tapering region (14) is formed on the free end (12) of the tubular starting material (10), and forming a screw-like or helical thread (16) on the at least partially tapering region (14).

Description

Method for producing a rotary foundation

Technical area

The invention relates to a method for producing a Drehfunklaments for anchoring components or structures in the underground.

State of the art

Rotary foundations are widely used in structural engineering for the direct anchoring of signs, masts, roofs and the like in the ground. For this purpose, rotary foundations, which are also referred to as ground anchors, a helical coarse thread, which can be screwed directly into the ground.

For the production of the rotary foundations, it is known, for example from DE 198 36 370 A1, to hammer a cylindrical tube into the desired shape. This is usually done using a conical shape, in which the cylindrical tube is hammered in the tube longitudinal direction. A tip is then welded to the tapered end of the tube thus produced. Further, another pipe section is welded to the opposite end of the pipe to achieve the desired length of the rotary foundation.

Although such rotary foundations have been proven in practice, it has been found that they are associated with a comparatively high manufacturing outlay and have weak points in terms of durability and strength.

Presentation of the invention

It is therefore an object of the present invention to provide a method of manufacturing a rotary foundation which, while minimizing weak points, enables a simple manufacturing process.

This object is achieved by a method for producing a rotary foundation according to claim 1. Particularly advantageous developments of the invention are specified in the dependent claims. The invention is based on the idea of reducing the number of process patterns acting directly on the later rotary foundation in such a way that not only a simplified process sequence but at the same time a reduced number of interfaces and thus weak areas results Against this background the inventive method has the following steps

Providing a tubular starting material having a required length, inserting a free end of the tube-forming starting material between at least two shaped bodies,

Holding the tubular starting material in its longitudinal direction, compressing the free end of the tubular starting material by moving together the at least two shaped bodies, whereby an at least partially tapered region is formed at the free end of the tubular starting material

Forming a screw or screw-like thread on the at least partially tapered region

By the use according to the invention of a plurality of movable moldings which compress the free end of the tubular starting material, it is possible to use several process steps and interfaces available in the prior art. Thus, with the method according to the invention, long turning foundations can also be produced from a single tubular starting material without additional pipe sections must be welded. As a result, an essential, static and corrosion-technical vulnerability is eliminated

In addition, the inventive method allows a comparatively low Mateπaieinsatz and a uniform wall thickness of the rotary foundations Here, even without changing the Formkorper Ausgangsmateπalien be processed with different diameters (this then only requires a longer track of the Formkorper).

Furthermore, it is possible with the inventive method mogiich, even one required for penetration and propulsion in the soil one-piece from the rohrformigen Produce starting material, so that here, too, corresponding complexity and vulnerabilities are avoided

According to a development of the method according to the invention, it is provided that the moldings are uniformly acted upon by a hydraulic press during assembly. The use of a hydraulic press allows a draughty and precise procedural sequence, the uniform distribution of the pressing force resulting in low residual stresses and thus a high load capacity of the manufactured rotary foundation beitiagt.

The number of Formkorper used for Zusammendrucken is not particularly limited in the invention According to a development of the invention, however, it is provided that at least three, preferably at least four moldings are used for Zusammendrucken the tread end of rohrformigen Ausgangsmatenals. This in turn results in a uniform deformation with low residual stresses

According to a development of the method according to the invention, it is further provided that the shaped bodies are configured and moved together in such a way that the free end of the tubular material is formed into a blunt end. Mateπaian accumulations and stress concentrations in the region of the free end can thereby be avoided that even a blunt end can easily turn into most soil

In this concept, it is particularly preferred that the free end of rohrformigen starting material is formed by the Formkorper such that it has an axial passage opening This not only facilitates screwing, but the Durchgangsoffnung also allows the outflow of (rain) water that could otherwise cause corrosion or frost damage

According to one embodiment of the invention is also provided that at least one Formkorper on its the rohrformigen starting material facing surface has at least one projection in this way, the rohrformige Ausgangsmateπai be firmly and firmly held in the longitudinal direction during the pressing process This applies regardless of the length of rohrformigen Starting material, while length changes in other detentions require each reconstruction work. The depressions in the tubular starting material which arise as a result of the at least one projection possibly are insignificant for the present application.

According to a development of the invention, it is further provided that a connection section is further formed on the tubular starting material, which is provided on the side of the tubular starting material opposite the at least sectionally tapered region. As a result, objects to be anchored can be easily and securely connected to the rotary foundation, wherein the attachment section can advantageously also be formed using collapsible shaped bodies.

The tubular starting material may in the context of the present invention have different geometries, such as a rectangular or round cross-section, and may be made of different materials. Particularly advantageous is the use of stainless steel, which combines good ductility with high corrosion resistance.

Another method according to the invention for producing a rotary foundation is the subject matter of independent claim 9. This method is based on the same idea of the invention as the method described above, in which the portions of the method steps acting directly on the later rotary foundation are to be reduced. For this purpose, the method defined in claim 9 comprises the following steps:

Providing a tubular, one-piece starting material;

Dividing the starting material into at least two main bodies each along a serrated line, whereby basic bodies are formed with at least two tine-like sections;

Deforming the tine-like portions to form a tapered portion of the body;

Connecting the tine-like sections together along at least one

Weld. In this method can be dispensed with strong deformation or compression of the starting material. The process can therefore be carried out with simple means and only a very small amount of starting material is needed. Furthermore, the later rotary foundation obtains a very uniform wall thickness, and the rotary foundation can be made in large quantities without welding additional pipe sections. This applies in particular if, according to a development of the invention, the at least one weld seam is provided in a tapering section.

Brief description of the drawings

Fig. 1 shows schematically a side view of a rotary foundation which has been manufactured by means of a method according to the invention;

Fig. 2 shows schematically a side view of a rotary foundation made by means of a method according to the invention;

Fig. 3 shows schematically a side sectional view of a rotary foundation in

Course of the method according to the invention;

Fig. 4 shows schematically moldings which in the course of the invention

Method be used;

Fig. 5 shows schematically an alternative embodiment of the method according to the invention or of a rotary foundation produced therewith.

Detailed description of preferred embodiments

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

The method according to the invention is used to produce rotary foundations 1, as illustrated by way of example in FIG. 1 and FIG. 2, each in a side view. The rotary foundations 1 are used for anchoring components or structures in the ground and can be screwed for this purpose by means of a screw or helical thread 16 in the ground. The clothing 16 is provided at least on a tapered region 14 of a starting material or basic body 10. Further, the rotary foundation 1 has, on the opposite end of the tapered portion 14, a terminal portion 30 which in the present embodiment is formed by a circumferential flange which may include, for example, through-holes (not shown) or welded-on threaded nuts (not shown).

The inventive method for producing the rotary foundation 1 will be described below with reference to Figures 3 and 4. First, a tubular starting material 10, which may be made of stainless steel, for example, is provided with a required length, wherein the tubular starting material 10 may have, for example, a rectangular or round cross section (hollow cross section). Anschϊießend the free end 12 of the rohrförmägen starting material 10 is inserted between a plurality of moldings 20, wherein the arrangement of the moldings in the present embodiment in Fig. 4 is shown schematically.

As can be seen in FIG. 4, the molded bodies 20 can be moved radially between an open position (FIG. 4 a)) and a closed position (FIG. 4 b)). Accordingly, the moldings are moved before inserting the free end 12 of the rohrformigen Ausgangsmateriais 10 in the position shown in Fig. 4a). Once the free end 12 is inserted and positioned, for example by means of a stop, the moldings 20 are moved radially together. They are uniformly acted upon by a press 22 shown schematically in FIG. 3, so that the free end 12 of the tubular starting material 10 is uniformly compressed.

In this case, the projections 24, which are each formed on a rohrformigen the starting material facing surface of the moldings 20, in the surface of the rohrformigen Ausgangsmateriais 10, so that the tubular starting material 10 is held in the longitudinal direction.

This compression of the free end 12 of the starting tubular material 10 is continued until the free end 12 obtains the desired tapered shape has, as shown for example in Fig. 3 schematically in a sectional view. The free end 12 shown in Fig. 3 thus has a blunt end 18 which defines an axial passage opening 12a.

Subsequently, the pressing force of the hydraulic press 22 is released and the moldings 20 are moved back slightly, so that the starting material 10 can be removed.

Now the screw or helical thread 16 is formed on the tapered portion 14, for example by welding corresponding thread turn!. Furthermore, the connection section 30 already described above is formed on the tubular starting material 10, for example also by welding. This completes the manufacturing process.

An alternative method according to the present invention for manufacturing a rotary foundation 1 will be described below with reference to FIG. In this method, too, a tubular, one-piece starting material 10 is provided, as has already been described above. This starting material 10 is, as shown in Fig. 5a), divided along a serrated line 42 into two main body, whereby basic body 40 are formed with two tine-like sections 44.

These tine-colored sections 44 are now deformed in such a way that they form a tapering section 14 of the basic body (compare FIG. 5b)). Now, the tine-like portions 44 are joined together along a weld 46 provided in the tapered portion 14.

Finally, although not shown in Fig. 5, a thread in the region of the tapered portion 14 and a flange portion or the like are provided, so that the production of the rotary foundation 1 is completed.

Claims

claims

1. A method for producing a rotary foundation (1) for anchoring of components or structures in the underground, comprising the steps

Providing a starting tubular material (10) of a required length,

Inserting a free end (12) of the tubular starting material (10) between at least two shaped bodies (20),

Holding the tubular starting material (10) in its longitudinal direction,

Compressing the free end (12) of the tubular Ausgangsmateriais (10) by moving together the at least two moldings (20), whereby at the free end (12) of the tubular starting material (10) an at least partially tapered region (14) is formed, and

Forming a screw-like or Schneckenartigeε thread (16) on the at least partially tapered region (14).

2. The method according to claim 1, characterized in that the shaped bodies (20) when moving together evenly by a hydraulic press (22) are acted upon.

3. The method according to claim 1 or 2, characterized in that at least three, preferably at least four moldings (20) are used for compressing the free end (12) of the tubular Ausgangsmateriais (10).

4. The method according to any one of the preceding claims, characterized in that the shaped bodies (20) are configured and moved together so that the free end (12) of the tubular Ausgangsmateriais (10) is formed into a blunt end (18).

5. The method according to claim 4, characterized in that the free end (12) of the tubular starting material is formed by the shaped body (20) such that it has an axial passage opening (12a).

6. The method according to any one of the preceding claims, characterized in that at least one shaped body (20) has on its the tubular starting material facing surface at least one projection (24}.

7. The method according to any one of the preceding claims, characterized in that the rohrformige starting material (10) has a rectangular or round cross-section,

8. The method according to any one of the preceding claims, characterized in that on the tubular starting material (10) further comprises a Anschluεsabschnitt (30) is formed on the at least partially tapered region (14) opposite side of the tubular starting material (10) is provided.

9. The method according to claim 8, characterized in that the connecting portion (30) with a tube around the Ausgangsmaieria! circumferential flange (30) is formed having through-holes and / or welded threaded nuts.

10. The method according to any one of the preceding claims, characterized in that the rohrformige Ausgangsmateriai (10) at least partially made of stainless steel.

1 1. Method for producing a rotary foundation (1) for anchoring components or structures in the subsurface, comprising the steps of:

Providing a tubular, one-piece starting material (10); Dividing the starting material (10) into at least two main bodies (40) each along a serrated line (42), whereby basic body (40) are formed with at least two tine-like sections (44);

Deforming the prong-like portions (44) to form a tapered portion (14) of the main body (40);

Connecting the Ziπkenartigen sections (44) together along at least one weld (46).

12. The method according to claim 10, characterized in that the at least one weld (46) in the tapered portion (14) is provided.