Scaffold anchors for attaching scaffolding to building components using threaded rods

Abstract

The invention relates to the fastening of scaffolding to, for example, metallic building parts, such as metal facades, by means of a scaffold anchor into which a magnet with a threaded rod can be screwed. Described is a scaffold anchor (1), comprising • a scaffold tube (2) of at least 5cm length with a scaffold tube inner side (A) and a scaffold tube end (B), • an intermediate piece (3), pressed into the scaffold tube (2), with a - Opening (3B) for a threaded bushing (4), • the threaded bushing (4), - wherein this is pressed into the intermediate piece (3) in the opening (3B), and - has a threaded opening (4B) with an internal thread for a threaded rod, and • a cover ring (5) that partially covers and secures the intermediate piece (3) towards the scaffold tube end (B); as well as a set with this scaffold anchor, the use and a method for manufacturing the scaffold anchor

Description

[0001] The invention relates to the fastening of scaffolding to, for example, metallic, magnetic building parts, such as metal facades and structures made of steel or with steel components, by means of a scaffold anchor into which a magnet with a threaded rod can be screwed.

[0002] Scaffold anchors for traditional stone facades are well-known in the state of the art. Scaffold anchors are the connecting elements between the building and the actual scaffolding network. An eyelet is drilled into the building facade, and the scaffold anchor is hooked into the eyelet using a hook welded to the outside of the scaffold anchor.

[0003] The disadvantage of known solutions is that drilling into the building surface is necessary, which is not desirable for metallic exterior facades.

[0004] In addition, such eyelets with hooks offer too much scope for the mobility of the scaffolding.

[0005] The use of magnets for fastening to metallic building facades is well known, whereby eyelets with threaded rods are screwed into the magnet and then the above-mentioned scaffold anchors with welded hooks can be used.

[0006] Other fastenings are known in the state of the art.

[0007] DE3317658A1 describes scaffold anchors consisting of a pipe with an internal thread, at one end of which an abutment in the form of a flange, an annular plate, a rod, or the like protrudes beyond the circumference of the pipe, and into which a rod is screwed, the end of which is in the form of a hook located outside the pipe. A flange is an annular disc used to connect pipelines with screws. The component, into which a threaded rod is screwed, is bolted to the pipe end by means of a flange. The risk of material fractures is high due to the small surface area for force distribution. Perforated flanges can also be prone to fracture under excessive stress due to the numerous screw holes.

[0008] Threaded bushings for screwing in threaded rods are described in many different variants.

[0009] DE10058219A1, for example, describes an anchor with a hook. The anchor has a telescopic rod, and one of its ends is screwed into a threaded bushing. Apparently, the scaffold tube of the scaffold anchor itself is a threaded bushing, so any forces act directly on this internal thread. Acting forces are not distributed to other connection points.

[0010] DE 10 2011 005 458 A1 describes, among other things, a masonry anchor in which a cylindrical body is designed as a steel tube with a receiving opening with an internal thread. A bridge element is plate- or plug-shaped. A perforated disc is firmly welded to the interior of the tube. The disadvantage here, too, is the poor distribution of the forces acting on the internal thread.

[0011] The object of the invention is to develop a simple fastening method for scaffolding in the form of a scaffold anchor. It should be suitable for use on metal building facades and thus make it possible to do without drilling holes in the metal building facade.

[0012] The forces exerted by the scaffolding and its movement should be distributed as evenly as possible within the scaffold anchor to prevent damage to the scaffold anchor. A tensile force of 300 kg (equivalent to 3,000 Newtons) should be easily withstood. Manufacturing should be simple.

[0013] The problem is solved by the features of the independent patent claims. Preferred embodiments are described in the dependent subclaims.

[0014] The invention relates to a scaffold anchor comprising • a scaffold tube of at least 5cm length with a scaffold tube inside and a scaffold tube end (preferably at least 20cm, preferably a maximum of 150cm, also 25±5cm), • an intermediate piece, pressed into the scaffold tube, with a - Opening for a threaded bushing, • the threaded bushing, - which is pressed into the intermediate piece in the opening, and - has a (through) threaded opening with an internal thread (e.g. M10 or M12) for a threaded rod, and • a closing ring that partially covers and holds the intermediate piece towards the end of the scaffolding tube.

[0015] When in use, the "scaffold tube end" points toward the facade wall, allowing a magnet with a threaded rod to be screwed into the internal thread of the threaded bushing. The "scaffold tube inside" is not the end of the scaffold tube, but rather the interior area near the center of the scaffold tube.

[0016] According to the invention, the intermediate piece is round. The threaded bushing is also preferably round, although a square or hexagonal shape, as is often available in bulk products, would also be possible. A round threaded bushing is preferred, however, because this makes it much easier to create the opening at the end of the intermediate piece for the threaded bushing. To effectively press the threaded bushing into the intermediate piece (i.e., the opening for a threaded bushing), the threaded bushing is preferably 0.1 mm to 0.5 mm wider / thicker than the opening for it.

[0017] "Partially covered" (with regard to the end ring) in the sense of the invention means that at least the following is not covered: the threaded opening of the threaded bushing, because a threaded rod, e.g. of a magnet, should be able to be screwed through it. However, it is advantageous if as much of the area of ​​the intermediate piece (and the threaded bushing) as possible is covered by the end ring. This allows the force of a fluctuating scaffold to be distributed over a larger area. This means that "partially covered" preferably corresponds to complete coverage (around the circumference of the intermediate piece) with the threaded opening of the threaded bushing left out. The result is a ring shape.

[0018] The end ring can be used to secure the scaffold tube (e.g., by welding the end ring to the end of the scaffold tube) to create a frictional connection between the scaffold tube and the end ring, as well as to the intermediate piece and threaded bushing. In any case, the connection (between the end ring and the scaffold tube) is such that a completely non-destructive separation of the two parts is impossible or very difficult. Preferably, the end ring is welded to the scaffold tube at the end of the scaffold tube. The end ring can be a single component or be integrally connected to the intermediate piece. In the latter case, the end ring is part of the intermediate piece and defines its boundaries on one side (similar to a T-beam or a circumferential widening collar of the intermediate piece).

[0019] The end ring is not perforated, as is usually the case with flanges, but is a disc with only a single opening for the passage of a threaded rod.

[0020] A threaded rod (to which, for example, a magnet is attached for attachment to magnetic exterior facades) can thus be screwed (as viewed from one end of the tube) through the threaded bushing and, if necessary, further through the intermediate piece.

[0021] The scaffold anchor according to the invention serves to provide a force-locking and form-locking connection between the threaded bushing and the scaffolding tube, so that a threaded rod, e.g. of a magnet, can be screwed into the threaded bushing.

[0022] The invention further relates to a set comprising the scaffold anchor according to the invention and a magnet with a threaded rod for connecting the magnet to the scaffold anchor (by screwing the threaded rod of the magnet into the threaded opening of the threaded bushing and, if necessary, later into the internal threaded opening of the intermediate piece).

[0023] Finally, the subject of the invention is also the use of the scaffold anchor according to the invention for fastening to metallic and magnetic building parts, facades or structures made of steel or steel components by means of a magnet (with threaded rod).

[0024] Finally, the subject matter is a method for producing a scaffold anchor comprising the steps: a) Pressing an intermediate piece, with an opening for a threaded bushing, into a scaffold tube of at least 5 cm length with the scaffold tube inside and scaffold tube end (best inserted and pressed in from the scaffold tube end), b) Pressing a threaded bushing into the opening of the intermediate piece for a threaded bushing, wherein the threaded bushing has a (through) threaded opening with an internal thread for a threaded rod, and c) Partially cover the intermediate piece towards the end of the scaffold tube with a cover ring and connect the cover ring and the scaffold tube so that it holds the intermediate piece in place.

[0025] In particular, it is also a method for producing the scaffold anchor according to the invention.

[0026] Steps a) and b) can also be swapped, so that under certain circumstances the threaded bushing is pressed into the intermediate piece first and only then the intermediate piece (with threaded bushing) is pressed into the scaffold tube.

[0027] Specifications for the scaffold anchor also concern the set, use and procedure and vice versa.

[0028] The invention advantageously makes it possible to firmly connect scaffolding to building facades. It can be used on metallic facades, and in this case, the invention eliminates the need for holes in the metallic and magnetic facade or the structure made of steel or with steel components.

[0029] Advantageously, the force exerted by the scaffolding and its movement is distributed evenly and widely within the scaffold anchor, preventing damage to the scaffold anchor. Advantageously, a tensile force of at least 300 kg (equivalent to 3000 Newtons) is withstood.

[0030] In addition, there is no mobility between the scaffold anchor and the building facade, unlike with known scaffold anchors for stone facades with eyelets and hooks.

[0031] It is advantageous that the scaffold anchor is easy to manufacture. Preferred embodiments

[0032] In a preferred embodiment, the end ring is formed integrally with the intermediate piece. The end ring is part of the intermediate piece and defines one side of it (like a T-beam or a circumferential widening collar of the intermediate piece). The advantage of this design is that this single part can be easily and quickly turned during production.

[0033] In a preferred embodiment, the end ring, intermediate piece and scaffold tube are made of aluminum.

[0034] In a preferred embodiment of the invention, the scaffold tube has an outer diameter of approximately 48mm (corresponding to 1 ½ inches) ±3mm and a wall thickness of 5mm ±0.5mm.

[0035] It is also preferred if the scaffold tube is at least 30 cm long. The scaffold tube is particularly preferably 30-120 cm long.

[0036] In a preferred embodiment of the invention, the intermediate piece pressed into the scaffold tube has a - internal threaded opening with the internal thread for the threaded rod, - and the opening for the threaded bushing is an end opening.

[0037] The internal thread of the internal threaded opening (of the intermediate piece) is logically the same internal thread as that of the threaded bushing, so that a threaded rod can be screwed through both.

[0038] This version corresponds to the exemplary partial representation in Fig. 2 and Fig. 3.

[0039] Advantage of this preferred embodiment, as in Fig. 2 and Fig. 3, is that the threaded rod can be screwed even further into the internal thread of the intermediate piece and the forces acting on the internal thread and the scaffold anchor can be distributed even further within the scaffold anchor.

[0040] The "end opening" is the opening of the intermediate piece that points toward the scaffold tube end. Similarly, the "internal threaded opening" is the opening of the intermediate piece that points toward the inside of the scaffold tube and thus away from the near end of the scaffold tube. A scaffold tube thus clearly has three areas: the scaffold tube end (in this area is the inventive intermediate piece with threaded bushing and end ring), the inside of the scaffold tube, and the second scaffold tube end, which, when in use, points away from the facade wall and toward the scaffold.

[0041] In this embodiment, the threaded bushing cannot completely penetrate the intermediate piece ( Fig. 2 / Fig. 3). Rather, it abuts against the end of the end opening, since the diameter of the internal threaded opening is clearly and reasonably smaller than the diameter of the threaded bushing (and thus also the opening for the threaded bushing).

[0042] It is particularly preferred if (as in Fig. 4) the end ring covers the scaffold tube towards the end of the scaffold tube.

[0043] In a further preferred embodiment of the invention, the threaded bushing is made of steel.

[0044] It is also a preferred design if the intermediate piece is made of aluminum.

[0045] Both designs are particularly suitable for use on scaffolding tubes and for connection by means of press-fitting.

[0046] In a further preferred embodiment of the invention, the internal thread is an M10 internal thread with a total length of 25-30 mm. These are standardized thread sizes with standardized pitches, according to known tables.

[0047] If, in a design, the internal thread is divided between both the threaded bushing and the intermediate piece, the total length refers to both internal threads. This means that both internal threads are meant: the one from any existing internal threaded opening of the intermediate piece and the one from the threaded opening of the threaded bushing according to the invention, which, according to the invention, is located closer to the scaffold tube end than the first-mentioned internal thread of the intermediate piece.

[0048] This means specifically: in a preferred embodiment, in which the intermediate piece pressed into the scaffold tube has: a - internal threaded opening with the internal thread for the threaded rod, and where the opening for the threaded bushing is an end opening, the total length refers to both, the intermediate piece and the threaded bushing, because they are located one above the other and the internal thread goes through both.

[0049] It is a preferred embodiment if the intermediate piece has a round, axially symmetrical and essentially T-shaped cross-section (as exemplified in Fig. 1a. The overall width (i.e., the widest outer diameter of the intermediate piece including the end ring) is preferably 48.3 mm (outer diameter). The thickness of the horizontal T-beam (end ring) is particularly preferred at 5 mm, and the width (in terms of the diameter of the scaffold tube) is 3.25 mm on each side of the "T" (i.e., 6.5 mm on both sides combined). All of these figures should be understood with range limits of ±10% of the respective value; even ±5% is possible.

[0050] The projections of the horizontal T-beam are to be understood as a closing ring in the form of a widening, in the manner of a collar of the intermediate piece.

[0051] An intermediate piece shaped in this way is particularly well-suited for pressing. The essentially T-shape creates a small contact area between the intermediate piece and the scaffolding tube, resulting in high contact pressure after pressing in. This reduces the likelihood of the intermediate piece accidentally coming loose under high tensile forces. This is particularly important in the area of ​​the largest diameter, namely the scaffolding tube. This is where the expansion in the metal is greatest, so that an already low contact pressure can be further reduced, which could make accidental loosening easier.

[0052] In a preferred embodiment of the invention, the end ring is a circumferential, annular widening of the intermediate piece at that of the two ends (of the intermediate piece) which points towards the scaffold tube end, and this widening has a width of at least 3 mm of the radius of the intermediate piece; particularly preferably of 4 mm ± 1 mm or even 3.25 mm, and / or a thickness (direction along the scaffold tube length) of 5 mm ± 1 mm.

[0053] "At least 3mm of the radius" means that the diameter, when viewed along the tube length, widens by at least 6mm. The widening preferably has a thickness (i.e., thickness viewed along the length of the scaffold tube) of 5mm ±1mm.

[0054] This design is particularly suitable for achieving a high contact pressure (see last design regarding T-shape).

[0055] In a further preferred embodiment of the invention (which is shown schematically in Fig. 1a is shown): - the end ring is a circumferential, annular widening of the intermediate piece at the end of the two ends which points towards the scaffold tube end (B), and this widening has a width of at least 4 mm of the radius of the intermediate piece (particularly preferably 4-6 mm), and - the threaded bushing (for example made of steel or brass) also has a circumferential widening of at least 4mm (particularly preferably 4-6mm) of the radius at the opposite end, which faces the inside of the scaffolding tube (the widening of the threaded bushing can be round or square; the same applies to the widening).

[0056] It can be seen that the opening (of the intermediate piece for the threaded bushing) is a through opening, i.e. the intermediate piece is tubular.

[0057] In addition to the above-mentioned sufficient contact pressure, the advantage of the invention is that the other widened portion, namely the one on the threaded bushing, provides additional retention of the threaded bushing within the intermediate piece. This is because the widened portion of the threaded bushing abuts the edge of the intermediate piece when pulled out, preventing it from slipping out.

[0058] The advantage of this design is that the construction is even further protected against accidental breakage.

[0059] It also corresponds to a preferred embodiment if the intermediate piece has a length of 20 mm ± 3 mm and / or (with a 5 mm thick end ring) 25 mm ± 3 mm and / or the threaded bushing has a length of 30 mm ± 3 mm. This provides an optimal balance between strength and material economy.

[0060] In a further preferred embodiment, the end ring is made of aluminum and welded to the scaffold tube at the scaffold tube end.

[0061] In a preferred embodiment, the end ring has a thickness of (3-5mm or better:) 5mm±0.5mm.

[0062] In a further preferred embodiment of the method according to the invention, for the (effective and durable) pressing of the threaded bushing into the intermediate piece in step b): The opening of the intermediate piece for the threaded bushing has a diameter of 31.8 mm ±3 mm (preferably ±2 mm), and the diameter of the threaded bushing is 0.1 mm ±0.05 mm larger. It is particularly preferred that it is exactly 0.1 mm larger.

[0063] This means that in the case of 31.8mm as the diameter of the opening of the spacer for the threaded bushing, the diameter of the threaded bushing that should be pressed in would be 31.9mm, for example.

[0064] In a likewise preferred embodiment of the method according to the invention, in step c), the end ring is welded to the scaffold tube end (using a weld seam) to connect the end ring and the scaffold tube. The width of the end ring is selected to match the wall thickness of the scaffold tube so that it can be as flush as possible with the outer wall of the scaffold tube.

[0065] In a particularly preferred variant of these two embodiments regarding the diameter, the threaded bushing is made of steel and the intermediate piece is made of aluminum. These materials have proven to be the most suitable for achieving an effective and long-lasting press-in with these diameter differences prior to press-in. Steel is harder than aluminum and is particularly suitable for a diameter difference of approximately 0.1 mm. Fig. 1a and Fig. 1b are exploded views of the scaffold anchor in one embodiment. Fig. 1a shows parts of a first preferred embodiment of the scaffold anchor 1 according to the invention. The scaffold tube 2 is not shown. Fig. Figure 1b shows the dimensions of this preferred embodiment. Fig. 1c shows the assembled state of this version with scaffold tube.

[0066] Fig. 2 shows another embodiment of the scaffold anchor 1 according to the invention according to embodiment 2 (or as a set with a magnet with threaded rod), wherein the intermediate piece 3 also has an internal threaded opening 3A with internal thread for the threaded rod, and the opening 3B for the threaded bushing 4 is an end opening.

[0067] In this version, the threaded bushing 4 is located on the end opening of the scaffold tube at scaffold tube end B. Starting from Fig. 2 is in Fig. 3 the intermediate piece 3 in the scaffold tube 2 with end ring 5 without threaded bushing 4 can be seen.

[0068] Fig. 4 shows the scaffold anchor according to the invention in an embodiment in the manner of Fig. 1c.

[0069] It is advisable to combine the different embodiments with one another, unless otherwise stated.

[0070] The invention will be explained in more detail below using several preferred embodiments. These are not intended to limit the invention. EmbodimentsEmbodiment 1 / Fig. 1a, Fig. 1b and Fig. 1c:

[0071] Example 1 is shown in detail in Fig. 1a and Fig. 1b. The intermediate piece 3 has a height (i.e., the length in the direction of the scaffold tube) of 25 mm, including the shown widening (end ring 5) (of 5 mm). The threaded bushing 4 has a length of 30 mm, of which 5 mm is allocated to a widening 4C of 5 mm.

[0072] The intermediate piece 3 thus has a widening (end side) and the threaded bushing 4 also (inside).

[0073] The internal thread in the threaded opening 4B of threaded bushing 4 is M10. Both spacer 3 and threaded bushing 4 are round. The extensions are therefore both circumferential and ring-shaped, with a ring width (when viewed along the rotation axis) of 5 mm for extension 4C and 3.25 mm for end ring 5. Example 2 / Fig. 2:

[0074] Example 2 is in Fig. 2. A neodymium magnet 6 with threaded rod 7 is screwed into a preferred embodiment of the scaffold anchor 1.

[0075] In this embodiment of the scaffold anchor, the intermediate piece 3 (here made of aluminum) pressed into the scaffold tube also has a: - internal threaded opening 3A with the internal thread for a threaded rod 7, and the opening 3B for the threaded bushing 4 is an end opening. The threaded bushing 4 is made of steel.

[0076] Both threaded bushing 4 and intermediate piece 3 have a circumferential, annular widening (4C, 5) at one end, 5 mm wide and 5 mm thick. The internal thread was an M10 internal thread.

[0077] In its finished state, the scaffold anchor from this example is Fig. 4. The threaded bushing protrudes far enough from the intermediate piece (towards the end of the scaffolding tube) that the end ring protrudes 2mm from the intermediate piece (at the end of the scaffolding tube). Stress test 3:

[0078] The scaffold anchor made of Fig. 1a or Fig. 1b was subjected to a load test with a neodymium magnet connected to a threaded rod, and a load of 327 kg (equivalent to 3270 N) was achieved. The magnet itself allows a holding force of 4,500 N (450 kg) and measures 200 mm x 60 mm x 28 mm. The threaded stud of the magnet is M10 x 25 mm. Reference symbol 1 scaffold anchor 2 scaffolding tubes 3 intermediate piece 3A Internal threaded opening (of the intermediate piece) with internal thread (for a threaded rod) 3B Opening (of the intermediate piece, for a threaded bushing) 3C Widening of the intermediate piece (circumferential ring-shaped) 4 threaded bushing 4B Threaded opening (of the threaded bushing) with internal thread (for a threaded rod) 4C Widening of the threaded bushing (circumferential) 5 end ring 6 Magnet 7 Threaded rod of the magnet 8 Weld seam (if end ring is welded to scaffold tube) A scaffold tube inside B Scaffold tube end

Claims

[1] Scaffold anchor (1), comprising • a scaffold tube (2) of at least 5cm length with a scaffold tube inner side (A) and a scaffold tube end (B), • an intermediate piece (3), pressed into the scaffold tube (2), with a - Opening (3B) for a threaded bushing (4), • the threaded bushing (4), - wherein the latter is pressed into the intermediate piece (3) in the opening (3B), and - has a threaded opening (4B) with an internal thread for a threaded rod, and • a cover ring (5) that partially covers and holds the intermediate piece (3) towards the scaffold tube end (B). [2] Scaffold anchor according to claim 1, wherein the intermediate piece (3) pressed into the scaffold tube has a - internal threaded opening (3A) with the internal thread for the threaded rod, and the opening (3B) for the threaded bushing is an end opening. [3] Scaffold anchor according to one of claims 1 or 2, wherein the threaded bushing (4) is made of steel and / or the intermediate piece (3) is made of aluminum. [4] Scaffold anchor according to one of claims 1 to 3, wherein the internal thread is an M10 internal thread with a total length of 25-30mm. [5] Scaffold anchor according to one of claims 1 to 4, wherein the intermediate piece (3) has a round, axially symmetrical and substantially T-shaped cross-section. [6] Scaffold anchor according to one of claims 1 to 5, wherein the end ring (5) is a circumferential, annular widening of the intermediate piece at that of the two ends which points towards the scaffold tube end (B), and wherein this widening has a width of at least 3 mm of the radius of the intermediate piece. [7] Scaffold anchor according to one of claims 1 or 3 to 6, wherein - the end ring (5) is a circumferential, annular widening of the intermediate piece at the one of the two ends which points towards the scaffold tube end (B), and wherein this widening has a width of at least 3 mm of the radius of the intermediate piece, and - the threaded bushing at the opposite end, which faces the inside of the scaffold tube, also has a circumferential widening (4C) of at least 4 mm radius. [8] Scaffold anchor according to one of claims 1 to 7, wherein the intermediate piece (3) has a length of 25mm±3mm and / or the threaded bushing has a length of 30mm±3mm. [9] Scaffold anchor according to one of claims 1 to 8, wherein the end ring (5) is made of aluminum and is welded to the scaffold tube (2) at the scaffold tube end (B). [10] Scaffold anchor according to one of claims 1 to 9, wherein the end ring (5), intermediate piece (3) and scaffold tube (2) are made of aluminum. [11] Scaffold anchor according to one of claims 1 to 9, wherein the scaffold tube (2) is 30-120 cm long. [12] Set comprising a scaffold anchor (1) according to one of claims 1 to 11, and a magnet (6) with threaded rod (7) for connecting the magnet to the scaffold anchor. [13] Use of a scaffold anchor (1) according to one of claims 1 to 11, for fastening to metallic and magnetic building parts, facades or structures made of steel or steel components by means of a magnet (6). [14] Method for producing a scaffold anchor (1) comprising the steps: a) Pressing an intermediate piece (3) with an opening (3B) for a threaded bushing into a scaffold tube (2) of at least 5 cm length with scaffold tube inside (A) and scaffold tube end (B), b) pressing a threaded bushing (4) into the opening (3B) of the intermediate piece for the threaded bushing, wherein the threaded bushing has a threaded opening (4B) with an internal thread for a threaded rod (7), and c) Partially cover the intermediate piece towards the end of the scaffold tube with a cover ring (5) and connect the cover ring and the scaffold tube so that it holds the intermediate piece in place. [15] Method according to claim 14, wherein for pressing the threaded bushing (4) into the intermediate piece (3) in step b): the opening (3B) of the intermediate piece for the threaded bushing has a diameter of 31.8mm ±3mm, and the diameter of the threaded bushing is 0.1mm ±0.05mm larger.

Images