Device system for attaching a cantilever arm to a tripod structure formed from construction supports

Abstract

Device system for attaching a cantilever arm to a tripod device comprising a head plate (6) and at least three telescopic support legs (11) attached thereto, wherein the system accommodates a horizontal beam (7) to be attached to the head plate (6), characterized by the combination of: a) a beam support (8) which can be detachably attached to the head plate (6) and which supports the beam (7) as a central pivot and support point, and b) at least one adapter flange (9) which connects the beam (7) decentrally to at least one of the support legs (11) in order to introduce a bending moment generated by a load on the cantilever arm as a substantially axial force into said support leg (11).

Description

Technical field

[0001] The invention relates to the field of lifting, securing, and shoring technology. It relates in particular to a modular device system with which a temporary lifting device with a cantilevered beam (cantilever arm) can be created. Such devices are required in construction, assembly work, and rescue and recovery operations, for example by fire departments or the Federal Agency for Technical Relief (THW), to lift or lower loads in hard-to-reach locations. The invention uses a tripod as its basic structure, which is formed from commercially available construction props standardized according to EN 1065, such as those used, for example, in the Bautri system. State of the art

[0002] Various mobile devices are known for lifting loads at changing locations.

[0003] One category consists of integrated mobile tripod or gantry cranes, such as those offered by Tractel, Spanco, or REID Lifting. These systems are designed as self-contained units, often made of lightweight aluminum. They feature an integrated head plate and specific, telescopic legs. The disadvantages of these systems are their high purchase price and the fact that they are proprietary, specialized equipment that is not compatible with other standard construction equipment.

[0004] A second category of devices is found in formwork construction. Here, so-called prop heads (e.g., crossheads, fork heads) are mounted on props according to EN 1065 to support horizontal formwork beams. These systems are designed exclusively for absorbing vertical compressive forces, such as those that occur during the construction of concrete slabs. They are not structurally designed to support a beam as a cantilever and absorb the resulting significant bending moments and overturning forces. Attempting to use such prop heads for a cantilever would lead to high instability and a safety risk.

[0005] A third category comprises general lifting devices such as beam clamps or girder clamps. These serve to create an anchor point on an existing horizontal beam. However, they do not solve the problem of how such a beam itself can be temporarily and safely attached as a cantilever to a mobile support structure.

[0006] Overall, the current state of the art lacks a cost-effective and flexible solution that allows the use of widely available standard construction supports, found on almost every construction site or at rescue organizations, to build a safe and load-bearing mobile cantilever crane. Object of the invention

[0007] The invention is based on the objective of creating a device system that overcomes the disadvantages of the prior art. It aims to provide a simple, safe, and cost-effective way to convert an existing tripod device, formed from commercially available construction props, into a mobile cantilever crane. This system should be capable of supporting significant loads on a lateral jib by safely transferring the resulting bending moments into the support structure. Solution to the problem and advantages

[0008] This problem is solved by a device system with the features of claim 1. Advantageous embodiments of the invention are described in the dependent claims and the further independent claims.

[0009] The solution according to the invention consists of the combination of two coordinated main components: a support bracket and at least one adapter flange.

[0010] The support bracket is attached to the central head plate of the tripod and serves as a secure support and pivot point for a horizontal beam, such as an I-profile made of steel or aluminum. It fixes the beam against slipping and lifting.

[0011] The adapter flange represents the crucial innovation for absorbing the tilting forces. It connects the horizontal beam decentrally, i.e., at a distance from the central support point, to at least one of the inclined supports of the tripod. This transforms the bending moment generated by a load at the free end of the cantilever into a primarily axial compressive or tensile force and safely transfers it into the structure of the support.

[0012] This synergistic interaction enables, for the first time, a stable and load-bearing cantilever structure based on a simple tripod support. The advantages of this solution are numerous: • Modularity and flexibility: The system is a retrofit kit and can be used with existing, standardized construction supports and beams. • Cost-effectiveness: The acquisition costs are significantly lower compared to a complete special crane. • Safety: The targeted transfer of bending moments into axial support forces creates a statically defined and safe construction. • Easy handling: The system is designed for quick assembly and disassembly at changing locations. Brief description of the drawings

[0013] The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings. These show: • Fig. 1: A perspective overall view of the device system according to the invention in the assembled state on a tripod device. • Fig. 2: A detailed side view of the support bracket mounted on the head plate with the support inserted. • Fig. 3: A top view of the support bracket to illustrate the fastening and adjustment options. • Fig. 4: A perspective view of the adapter flange as a single component. Detailed description of the exemplary implementations

[0014] Fig. Figure 1 shows the device system according to the invention in a typical application. A tripod device consists of a central head plate (6) to which three telescopic support legs (11) according to EN 1065 are attached. A support bracket (8) is mounted on the head plate (6). A horizontal beam (7), for example an IPE steel beam, is supported in this support bracket (8). The beam (7) cantilevers beyond the base of the tripod, thus forming a cantilever arm. To absorb the tilting moment caused by a load (not shown) at the free end of the beam (7), an adapter flange (9) is provided. This adapter flange (9) connects the web of the beam (7) to one of the support legs (11) via screw connections (10).

[0015] The Fig. 2 and Fig. Figure 3 shows the support bracket (8) in detail. It consists of a base plate (2), preferably designed as a U-shaped profile. The base plate (2) has a central through-hole (3) for attachment to the head plate (6) of the tripod. Additionally, elongated holes (4) are provided, which allow for fine adjustment of the bracket (8) on the head plate (6) and can serve as further attachment points. Supports (5), for example in the form of bolts or welded-on strips, are attached to the sides of the base plate (2). The lower flange of the support (7) rests on these supports (5). At least one locking element, shown here as a through-bolt with a cotter pin (7a), engages through holes in the side walls of the bracket (8) and in the web of the support (7), thus securing it positively against longitudinal displacement and unintentional lifting.

[0016] Fig.Figure 4 shows the adapter flange (9) as a single component. It is preferably made from a single piece of sheet metal, e.g., steel S355JR, bent and hot-dip galvanized. The adapter flange (9) comprises a first mounting plate (9a) with holes (12) for positive-locking bolting to a support post (11). A second mounting plate (9b) is formed at a right angle to the first, also featuring holes (13), and is designed to be placed against the web of the beam (7) and bolted to it. The buckling zone (9c) between the two plates (9a, 9b) provides the necessary stiffness for force transmission.

[0017] In an alternative embodiment, the adapter flange (9) can also be made in two parts and provided with a joint or hinge to allow variable adjustment of the angle between the mounting plates (9a, 9b). Instead of screw connections, clamping devices for attachment to the support (11) or the beam (7) are also conceivable.

[0018] To assemble the system, the support bracket (8) is first screwed onto the head plate (6) of the assembled tripod. The support beam (7) is then inserted into the bracket (8), positioned at the desired boom length, and secured with the locking element (7a). Finally, the adapter flange (9) is firmly connected to both the support beam and the corresponding construction support (11). The system is now ready to bear loads. List of reference symbols 12 Base plate (of the support bracket) 3 Central through-hole 4 elongated holes (adjustment slots) 5 1 Support (bolt, strip) 6. Head plate (of the tripod) 7 Horizontal beam (cantilever arm) 7a Securing element (bolt with cotter pin) 8 Carrier bracket 9 Adapter flange 9a First mounting plate (support side) 9b Second mounting plate (carrier side) 9c Folding area 10 screw connection (on the adapter flange) 11 Construction support (according to EN 1065) 12 holes (in plate 9a) 13 Hole (in plate 9b)

Claims

[1] Device system for attaching a cantilever arm to a tripod device comprising a head plate (6) and at least three telescopic support legs (11) attached thereto, wherein the system accommodates a horizontal support (7) to be attached to the head plate (6), characterized by the combination of: a) a support bracket (8) which can be detachably fastened to the head plate (6) and which supports the beam (7) as a central pivot and support point, and b) at least one adapter flange (9) which connects the beam (7) decentrally to at least one of the support columns (11) in order to introduce a bending moment generated by a load on the cantilever as an essentially axial force into the said support column (11). [2] Support bracket (8) for receiving a horizontal support (7) on the head plate (6) of a tripod device, with a base plate (2) which has means for attachment to the head plate (6), characterized by, that the holder (8) has lateral supports (5) for the carrier (7) and at least one locking element (7a) which secures the carrier (7) inserted into the holder against longitudinal displacement and / or lifting in a form-fitting manner. [3] Adapter flange (9) for connecting a horizontal beam (7) to a construction support (11), characterized by , that it has a first mounting plate (9a) with means for attachment to the support (11) and a second mounting plate (9b) arranged substantially at an angle to it with means for attachment to the web of the support (7). [4] Device system according to claim 1, characterized by , that the support bracket (8) is designed as an open U-profile. [5] Device system according to claim 1 or support bracket according to claim 2, characterized by , that the base plate (2) of the support bracket (8) has at least one elongated hole (4) for adjustable attachment to the head plate (6). [6] Device system according to claim 1 or support bracket according to claim 2, characterized by , that the locking element (7a) is designed as a bolt with cotter pin guided through corresponding bores in the support bracket (8) and the support (7). [7] Device system according to claim 1 or adapter flange according to claim 3, characterized by , that the adapter flange (9) is made from a single piece of bent sheet metal. [8] Device system or adapter flange according to claim 7, characterized by that the metal sheet is made of steel, stainless steel or aluminium and preferably has a corrosion-resistant coating, such as galvanizing. [9] Device system according to claim 1 or adapter flange according to claim 3, characterized by , that the connection between the first (9a) and the second (9b) mounting plate of the adapter flange (9) is designed as an adjustable joint or hinge. [10] Device system according to claim 1, characterized by , that the support structures (11) comply with the standard EN 1065. [11] Device system according to claim 1, characterized by , that the means for attaching the adapter flange (9) to the support structure (11) are designed as screw connections (10) which are guided through existing holes in the support structure (11). [12] Device system according to claim 1, characterized by , that at the free end of the cantilever arm a bracing is provided by means of a strap, chain or rope to a ground support, which is attached to the opposite support via a further adapter flange (9).

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