Method for constructing a fall arrest device and device with a fall arrest mesh

Abstract

Method for constructing a fall arrest system (2) on a support device (1) for a formwork element (22) or a precast concrete element (20), comprising the steps of: a) providing the support device (1), which has: - an arrangement of supports (3), - a first and a second crossbeam (4a, 4b) connected to the arrangement of supports (3), - a first and a second transverse stiffener, preferably a first and a second crossbar (5a, 5b), for forming a tensile and compressive rigid connection between the first and the second crossbeam (4a, 4b), b) providing a fall arrest system (6) for securing a gap (14) between the first and the second crossbeam (4a, 4b), characterized in that providing the fall arrest system (6) (step b)) comprises: a1) connecting a first end region (7a) of the fall arrest system (6) to the first transverse stiffener (5a),wherein the catch grid (6) is arranged in an intermediate position directed downwards from the first transverse stiffener (5a); a2) pivoting the catch grid (6) about a pivot axis formed by the first transverse stiffener (5a); a3) connecting a second end region (7b) of the catch grid (6) to the second transverse stiffener (5b) so that the catch grid (6) is arranged in a securing position that secures the space (14) between the first and the second yoke beams (4a, 4b).

Description

[0001] The invention relates to a method for constructing a safety catch on a support device for a formwork element or a precast concrete element, comprising the following steps: a) Providing the support device, which has an arrangement of supports, a first and a second yoke beam connected to the arrangement of supports, a first and a second transverse stiffener, preferably a first and a second crossbar, to form a tension- and compression-resistant connection between the first and the second yoke beam, and b) Providing a retaining grid to secure a gap between the first and the second yoke beam.

[0002] Furthermore, the invention relates to a method for manufacturing a precast concrete ceiling and a method for constructing a ceiling formwork.

[0003] Finally, the invention relates to a support device with a safety catch, comprising: an arrangement of supports, a first and a second yoke beam connected to the arrangement of supports, a first and a second transverse stiffener, preferably a first and a second crossbar arranged substantially perpendicular to the first and second yoke beams, a catch grid to secure a gap between the first and the second yoke beams.

[0004] When erecting formwork for a slab, formwork elements are typically arranged on a support structure consisting of vertical columns and horizontal beams, preferably designed as crossbeams and yokes. The formwork elements are usually laid out manually by one or more installers. During this process, there is a risk for the installer of falling through gaps between the formwork beams that are not yet covered with formwork elements.

[0005] When constructing a precast concrete slab, a support structure consisting of vertical columns and horizontal joists is typically used, with the precast elements preferably placed directly onto the joists. This process also requires work where one or more fitters must climb onto the support structure. The precast elements are usually placed onto the joists using a crane. However, tasks such as precisely aligning the precast elements or releasing the crane chains are carried out manually. The fitters are usually standing on a previously installed precast element. This also poses a risk of falling through the gaps between the formwork beams, which are not yet covered with precast concrete elements.

[0006] Prior art has revealed grid- and net-based safety devices or fall arrest systems to prevent falls from the support structure to the ground.

[0007] WO 2024 / 083893 A1 discloses a safety device for slab formwork comprising a grid with a projection, preferably a raised edge, on one side. The safety device is placed on top of the formwork beams so that the projection or raised edge faces upwards. When a formwork panel is placed on the beams, an edge of the panel can be brought into contact with the raised edge of the grid, thus allowing the entire assembly of formwork panel and safety device to be moved longitudinally along the beams until the panel rests on the beams. However, since the safety device is placed from above, a special method is required to prevent the installer from falling through a gap between the beams while placing the device.Even in confined spaces or corridors, the described safety device reaches its limits, as sufficient horizontal space is required to move the grates. The safety device of WO 2024 / 083893 A1 would also be unsuitable for use in the production of precast concrete slabs, since the safety device resting on the beams would obstruct the placement of the precast concrete elements onto these beams.

[0008] US Patent 2019 / 0063086 A1 discloses another known formwork system with a safety device and a method for installing formwork panels in this formwork system. During initial assembly, the safety device is hooked into a guide attached to the longitudinal beams of the formwork system.

[0009] The leadership is, as in the Figuren 1-10 The design shown is a C-shaped profile, which, however, is disadvantageously prone to contamination. Furthermore, the folding mechanism shown, which folds the guide upwards when the safety device is attached, is also susceptible to contamination and malfunctions. In all the designs shown, the guides must, disadvantageously, first be mounted to the longitudinal beams of an existing guide system before the safety device can be used. Additionally, the safety device must be repositioned each time formwork panels are placed, which means extra work.

[0010] The safety device shown in US 2019 / 0063086 A1 can be moved along the longitudinal axis of the formwork system, and in some designs, rollers are provided for this purpose. This creates the risk that the safety device could shift due to a longitudinal force (for example, caused by a worker falling or an object falling into the device), thereby creating an unsecured gap through which a worker could fall. On inclined planes, there is a risk that the grid could slip longitudinally under the influence of gravity. This prior art proposes a complex mechanism to prevent longitudinal movement, but this mechanism is susceptible to contamination and malfunctions.

[0011] WO 2019 / 069246 A1 shows a spacer element for supporting two parallel joists of a slab formwork, which are supported by slab props, as well as a fall protection system for slab formwork using the spacer element. The fall protection system includes a net that is suspended from retaining elements connected to the spacer element. Attaching the net poses a safety risk for the installer, as it requires either climbing onto the slab formwork or at least using a ladder. Furthermore, attaching the net is relatively time-consuming. The net must be attached at all four corners, requiring four work steps at four different locations per net. Additionally, the retaining elements must first be attached to the existing slab formwork before the fall protection system can be used.

[0012] A support device for formwork elements or precast concrete components is also known, which has transverse stiffeners to form a tension- and compression-resistant connection between the yoke beams. The function of the known transverse stiffeners is to provide additional stability to the entire support device. A support device with transverse stiffeners is described, for example, in EP 3 719 236 B1.

[0013] In contrast, the object of the present invention is to alleviate or eliminate at least some disadvantages of the prior art. The invention preferably aims to provide a safety catch for a support device that is equally suitable for formwork elements and precast concrete elements, contains no complex, contamination-prone, or fault-prone parts, and can be assembled simply, quickly, and safely.

[0014] This problem is solved by a method for constructing a fall arrest system according to claim 1, a method for manufacturing a precast concrete slab according to claim 5, a method for constructing a slab formwork according to claim 6, and a support device according to claim 7. Preferred embodiments of the invention are specified in the dependent claims.

[0015] According to the invention, providing the collection grid comprises the following steps: a1) Connecting a first end region of the collection grid to the first transverse stiffener, wherein the collection grid is arranged in an intermediate position directed downwards from the first transverse stiffener, preferably inclined obliquely downwards, in particular substantially vertically; a2) pivoting the collection grid about a pivot axis formed by the first transverse stiffener; and a3) connecting a second end region of the collection grid to the second transverse stiffener, so that the collection grid is arranged in a securing position that secures the space between the first and the second yoke beam.

[0016] In the context of this revelation, "vertical" refers to the direction of gravity and "horizontal" refers to a direction orthogonal to the direction of gravity.

[0017] For the purposes of this disclosure, "longitudinal direction" means a direction that runs substantially parallel to the longitudinal axes of the elongated yoke beams, and "transverse direction" means a direction that runs substantially horizontally and substantially transversely to the longitudinal axis of the yoke beams, preferably substantially orthogonal to the longitudinal direction of the yoke beams.

[0018] All directional and length specifications relating to the support device refer to the intended state of use, i.e., the assembled state of the support device.

[0019] When the yoke beams are described below, the first and second yoke beams are meant. Similarly, the cross braces refer to the first and second cross braces.

[0020] The supports are preferably arranged substantially vertically. In a preferred application, formwork supports are provided. In a preferred embodiment, the supports, preferably the formwork supports, are telescopic. In a preferred embodiment, each of the supports has a head section which is connected to the respective yoke beam.

[0021] In a preferred application, the yoke beams rest essentially horizontally on the arrangement of supports. Of course, an inclined arrangement of the yoke beams can also be provided, for example, by using supports that extend to different lengths. The location and orientation specifications must then be transferred accordingly. Each yoke beam is supported by at least two supports spaced apart along the longitudinal direction of the yoke beam.

[0022] The transverse stiffeners, preferably crossbars, are designed as tension- and compression-resistant transverse connections between the yoke beams. This means that the horizontal distance between two yoke beams is essentially fixed by the transverse connections, so that the horizontal distance between two yoke beams cannot be significantly altered by the application of a transverse force, in particular a tensile or compressive force. The opposite ends of at least one of the transverse stiffeners can be connected to the heads of two columns. Furthermore, the opposite ends of at least one of the transverse stiffeners can be connected to brackets, preferably retaining clips, which can be attached to the yoke beams between the columns. Preferably, the transverse stiffeners are arranged essentially horizontally and essentially orthogonally to the yoke beams.The support structure can also include crossbeams, which are placed transversely on the yoke beams. In contrast to the crossbeams, the cross braces are arranged at or below the level of the yoke beams. Unlike the crossbeams, the cross braces are therefore not positioned above the yoke beams. In particular, the cross braces are located below the level of any formwork elements or precast concrete components placed on top. The cross braces increase the stability of the support structure and make it possible to partially or completely eliminate the need for lateral support legs on the vertical supports. By partially or completely eliminating lateral support legs, a larger usable area is available on the ground beneath the support structure.The transverse stiffeners primarily serve as bracing elements for the formwork and essentially only bear the weight of horizontal loads during assembly, the weight of the fall protection system, and, in the event of a fall into the fall protection system, the weight of the person. Specifically, the transverse stiffeners do not bear the weight of the formwork elements and the resulting concrete structure, nor the weight of a precast concrete slab. Unlike the crossbeams, the transverse stiffeners are not designed as load-bearing components of the support structure for the concrete element being produced (i.e., the concrete structure produced with the formwork elements or the precast concrete slab). Furthermore, the transverse stiffeners ensure that the spacing between two joists remains essentially constant along their entire length.The transverse stiffeners are essentially non-deformable with respect to the operating loads, thus achieving a tensile and compressive strength transverse connection between the yoke beams.

[0023] In a preferred embodiment, the cross stiffeners are telescopically designed.

[0024] In a preferred embodiment, the cross braces are made of a different material than the yoke beams. For example, the yoke beams can be made of wood and the cross braces can be made of metal.

[0025] In a preferred embodiment, the catch grid has a greater longitudinal extent than its transverse extent. In the secured position, the longitudinal extent refers to the extent in the longitudinal direction of the yoke beams, and the transverse extent to the extent in the longitudinal direction of the transverse stiffeners. In this embodiment, when the catch grid is pivoted upwards around the first transverse stiffener, it pivots over its shorter side, i.e., its transverse side.

[0026] The safety net serves as fall protection during work where a technician needs to climb onto the support structure. During this work, the safety net, and in particular the safety net itself, is not to be accessed. Therefore, the safety net is not designed as a work platform.

[0027] During the installation of the safety net, the installer(s) remain on the ground where the supports are erected. There is no need to climb onto the still unsecured support structure in a dangerous manner. A tool, in particular a mounting pole, which may have a fork at one end, can be used to pivot the safety net. This eliminates the need for a ladder. Therefore, unlike other methods in the prior art, the safety net can be put into working order with the inventive method before the first installer even climbs onto the support structure.

[0028] Before the first end section of the collection grid is connected to the first transverse stiffener, the collection grid and the first and second transverse stiffeners are in a separate, and in particular, isolated, state. When the first end section of the collection grid is connected to the first transverse stiffener, the collection grid is arranged in an intermediate position directed downwards from the first transverse stiffener, i.e., downwards, towards the substrate. The collection grid is preferably arranged at an angle to the horizontal of between 10 and 90 degrees. The angle to the horizontal is preferably at least 20 degrees, more preferably at least 40 degrees, even more preferably at least 60 degrees, and most preferably substantially 90 degrees.

[0029] The pivoting of the collection grid includes, in particular, a pivoting upwards, whereby the aforementioned angle to the horizontal steadily decreases.

[0030] Connecting the second end section of the collection grid to the second cross brace is preferably achieved by placing the collection grid onto the upper surface of the second cross brace. In the secured position of the collection grid, the first end section is connected to the first cross brace, and the second end section is connected to the second cross brace. Preferably, the first end section of the collection grid rests on the first cross brace, and the second end section rests on the second cross brace.

[0031] In a preferred embodiment, the catch grid is arranged in the secured position below the height of the upper edge of the first and second yoke beams.

[0032] According to the prior art as defined in US 2019 / 0063086 A1, the guides had to be attached to the yoke beams before the safety grille could be mounted. The guides served only as supports for the grille and had to be specifically designed for the yoke beams to allow for mounting. In contrast, the fall arrestor according to the invention can be placed directly onto the cross braces. This requires no prior modifications to the cross braces or other parts of the support structure, nor does it require any additional components. The method according to the invention is therefore particularly easy to implement and versatile. The fall arrestor according to the invention can be combined with various designs of the support structure that include cross braces, preferably crossbars. Thus, the fall arrestor according to the invention is also particularly well-suited for retrofitting older support structures.Thanks to the synergistic function of the cross braces as both system stabilization and grid support, the fall arrest system according to the invention can be erected using a particularly simple method and requires no further components apart from the fall arrest grid and the support device. This offers economic advantages and is also advantageous in terms of logistics. Small parts cannot be forgotten or delivered to the construction site incorrectly, and the fall arrest system can also be installed or retrofitted particularly quickly. While crossbeams were present in the prior art according to US 2019 / 0063086 A1, they did not contribute to the arrangement of the grid.

[0033] In a preferred embodiment, when the collection grid is pivoted i. the first end section of the catch grid on the first cross brace is moved away from the second cross brace, ii. the second end section of the catch grid is raised above the second cross brace, iii. the first end section of the catch grid on the first cross brace is moved towards the second cross brace, and iv. the second end section of the catch grid is lowered onto the second cross brace.

[0034] The pivoting of the safety net includes, in particular, a pivoting upwards, whereby steps i to iv can be performed sequentially and / or overlapping during the pivoting motion. Alternatively, the pivoting movement can also be interrupted while one or more of steps i to iv are being performed. In principle, steps i to iv can be performed with or without overlapping movements and with or without interrupting the pivoting, as long as the safety net ultimately reaches the described locking position. Step i can also be omitted if, when the first end section of the safety net is connected to the first cross brace, the second end section of the safety net already has a sufficient distance from the second cross brace to lift the second end section of the safety net above the second cross brace.

[0035] In the prior art according to US 2019 / 0063086 A1, a type of latching mechanism was used to pivot the grille upwards, with which the guide through the pivoting grille was temporarily folded upwards to enable the pivoting movement in the first place. In the method according to the invention, however, the release of the pivoting movement is achieved particularly simply by a short displacement of the grille over the transverse stiffener. The method according to the invention does not require a complex, delicate actuating mechanism that could be susceptible to contamination or malfunctions.

[0036] In a preferred embodiment, the collection grid has at least one stop element, preferably at least one stop hook, to limit displacement of the collection grid in at least one direction.

[0037] The stop element, preferably the stop hook, is preferably fixedly connected to the safety net via a joining connection, for example, a weld, and projects downwards when the safety net is in its secured position. The stop element thus limits the displacement of the safety net in at least one direction. Preferably, two stop elements limit the displacement in two opposite directions, preferably parallel and antiparallel to the longitudinal direction. This prevents the safety net from falling when a force is applied in the longitudinal direction. Such a force in the longitudinal direction can occur, for example, if people or objects fall into the safety net from an oblique angle above. The stop element provides a particularly simple way to secure the safety net against falling.The stop element can also serve to hook the safety net onto the first cross brace when connecting the first end section of the safety net to the first cross brace. This significantly facilitates pivoting the safety net around the first cross brace. Since the stop element is preferably permanently attached to the net, it does not constitute an additional small part. All components necessary for installation are integrated into the safety net itself. Preferably, the safety net consists of only a single part, namely the safety net. Therefore, no additional small parts besides the safety net need to be taken to the construction site. This design offers particular advantages with regard to construction site logistics. Preferably, no adjustments or modifications to the support structure are necessary for installing the safety net according to the invention, so the invention offers economic advantages.

[0038] In a preferred embodiment, the stop element limits the longitudinal displacement of the collection grid beyond one of the transverse stiffeners. Longitudinal displacement of the collection grid is then only possible until the stop element abuts the transverse stiffener.

[0039] In a preferred embodiment, the stop element is welded to the collection grid.

[0040] In a particularly preferred embodiment, the stop element is a stop hook arranged at an end region of the collection grid. Preferably, the indentation of the stop hook is directed towards the grid surface.

[0041] In a preferred embodiment, the collection grid has at least four stop elements, preferably at least four stop hooks, i.e., at least two stop elements per end region. Preferably, the four stop elements are arranged at the four corners of the collection grid. In a preferred embodiment, a first pair of stop elements, preferably stop hooks, spaced apart from each other in the transverse direction, prevents the collection grid from being displaced longitudinally over the first transverse stiffener at the first end region. A second pair of stop elements, preferably stop hooks, spaced apart from each other in the transverse direction, at the second end region of the collection grid prevents the grid from being displaced longitudinally over the second transverse stiffener.The longitudinal displacement of the collection grid is limited by ensuring that the longitudinal distance between the first and second pair of stop elements is only slightly greater than the longitudinal distance between the first and second transverse stiffeners. When in place, the longitudinal movement of the collection grid is limited to the length by which the longitudinal distance between the first and second pair of stop elements exceeds the longitudinal distance between the first and second transverse stiffeners. This length is preferably between 2 and 12 cm, more preferably between 4 and 10 cm, and even more preferably between 6 and 8 cm.

[0042] In a preferred embodiment, before the collection grid is pivoted, at least one of the stop elements, preferably at least one of the stop hooks, of the collection grid is hooked onto the first transverse stiffener, preferably the first crossbar. This allows the collection grid to be pivoted upwards without the installer having to hold its entire weight during the pivoting process. A large portion of the weight of the collection grid is supported by the first transverse stiffener, preferably the first crossbar, during the pivoting action.

[0043] In a preferred embodiment, before the collection grid is pivoted, two stop elements, preferably stop hooks, spaced apart from each other in the transverse direction, are hooked onto the first transverse stiffener, preferably the first crossbar. This allows for a particularly simple and ergonomic installation of the collection grid.

[0044] The collection grid has at least one grid element. The grid element preferably has longitudinal and transverse elements arranged essentially perpendicular to each other in a horizontal plane. Two longitudinal and two transverse elements each define a grid opening. The longitudinal and transverse elements can be individual metal bars welded together, or they can be formed by a wire mesh.

[0045] In a preferred embodiment, the collection grid has at least one longitudinal stiffening element on at least one of the opposite longitudinal sides, preferably on both opposite longitudinal sides, of the grid surface. The at least one longitudinal stiffening element can, for example, be a shaped tube or a profile section. In the installed state, the longitudinal stiffening element supports the weight of the collection grid, stabilizes the collection grid, and maintains the collection grid in its intended shape. The at least one grid element is arranged between the two longitudinal stiffening elements.

[0046] In a particularly preferred embodiment, the at least one stop element is connected to the at least one longitudinal stiffening element.

[0047] In a particularly preferred embodiment, two longitudinal stiffening elements and four stop elements are provided, with one stop element being arranged at each end of the longitudinal stiffening elements.

[0048] In a preferred embodiment, at least one longitudinal stiffening element projects beyond the grid surface in the longitudinal direction. This allows several safety nets to be placed one behind the other in the longitudinal direction without their grid surfaces overlapping. The installation and removal of the multiple safety nets can therefore take place in any sequence. When two safety nets are installed one behind the other in the longitudinal direction, a gap may form between the grid elements of the two safety nets. However, this gap is preferably not so large that a person could fall through it. The longitudinal extent of the gap is preferably a maximum of 15 cm. If a person falls into the safety net, the gap can widen to up to 30 cm in the longitudinal direction, for example, due to plastic deformation of the safety net.

[0049] In a preferred embodiment, the collection grid has at least one transverse stiffening element that defines one of the opposite transverse sides of the grid surface. The transverse stiffening element is preferably a shaped tube, but can also be a profile section or a double wire. Particularly preferred are two transverse stiffening elements, preferably shaped tubes, arranged on the two opposite transverse sides of the grid element.

[0050] In a preferred embodiment, the grid surface is a rectangle bounded by the longitudinal stiffening elements and the transverse stiffening elements.

[0051] In a preferred embodiment, each support has a head section, with the transverse stiffeners connected to the head sections of the supports. Preferably, each transverse stiffener is attached to the head sections of two supports spaced apart in the transverse direction, so that the transverse stiffener forms a tensile and compressive rigid connection between the two head sections of the two supports. The yoke beams are preferably connected to the head sections of the supports and, even more preferably, rest on the head sections of the supports.

[0052] In an alternative embodiment, the cross stiffeners each have a bracket at their opposite ends for mounting on the first and second yoke beams.

[0053] In a preferred embodiment, these supports are designed as U-shaped retaining clips that can be attached at any point to two yoke beams spaced apart in the transverse direction, so that the transverse stiffening forms a tensile and compressive rigid connection between the two yoke beams.

[0054] In a preferred embodiment, the collection grid has at least one grid element made of a dimensionally stable material, preferably metal. In this context, dimensionally stable means in particular that the grid element does not deform significantly during intended use, especially as long as no impact load acts on the grid element, and in particular does not deform plastically.

[0055] The problem is also solved by a method for manufacturing a precast concrete slab according to claim 5. The method may comprise the following steps: Providing a safety catch on a support structure according to the procedure described above; and placing a precast concrete element on the support structure.

[0056] In a preferred embodiment, the precast concrete element is placed on the first and second yoke beams.

[0057] The problem is further solved by a method for constructing a slab formwork according to claim 6. The method may comprise the following steps: Providing a safety catch on a support device according to the method described above; and placing a formwork element, preferably a formwork panel, onto the support device.

[0058] In a preferred embodiment, at least two crossbeams are placed transversely on the first and second yoke beams, and the formwork element is placed on at least two adjacent crossbeams.

[0059] The problem is also solved by a support device with a fall arrestor according to claim 7. The features, technical effects and advantages described above in connection with the method for constructing a fall arrestor are correspondingly transferable to the device.

[0060] According to the invention, a first end region of the collection grid is connected to the first transverse stiffener, preferably placed on the first transverse stiffener, and a second end region of the collection grid is connected to the second transverse stiffener, preferably placed on the second transverse stiffener.

[0061] In a preferred embodiment, the collection grid has at least one stop element, preferably at least one stop hook, to limit displacement of the collection grid in at least one direction. The stop element can be designed as described above in connection with the method.

[0062] In a preferred embodiment, the collection grid has at least one longitudinal stiffening element on at least one of the opposite longitudinal sides, preferably on both opposite longitudinal sides, of the grid surface. The collection grid can be designed as described above in connection with the method.

[0063] In a particularly preferred embodiment, the at least one stop element is connected to the at least one longitudinal stiffening element.

[0064] In a particularly preferred embodiment, the longitudinal stiffening element projects beyond the grid surface in the longitudinal direction.

[0065] In a preferred embodiment, the collecting grid has at least one transverse stiffening element which limits one of the opposite transverse sides of the grid surface.

[0066] In a preferred embodiment, the supports each have a head section, with the first and second transverse stiffeners being attached to the head sections of the supports.

[0067] In an alternative embodiment, the first and second cross stiffeners each have a bracket at their opposite ends for mounting on the first and second yoke beams.

[0068] In a preferred embodiment, the collection grid has at least one grid element made of a dimensionally stable material, preferably metal.

[0069] The invention is further explained below with reference to the exemplary embodiments shown in the drawings. Fig. 1 shows a first variant of the support device according to the invention with a safety catch. Fig. 2 shows a detailed view of the first variant of the support device according to the invention with safety catch. Fig. 3 shows a collection grid of the first variant of the support device according to the invention with collection safety device. Fig. 4 shows a second variant of the support device according to the invention with a safety catch. Fig. 5 shows a detailed view of the second variant of the support device according to the invention with safety catch. Fig. 6 shows a collection grid of the second variant of the support device according to the invention with collection safety device. Fig. 7A bis Fig. 7E show the process of setting up the support device with safety catch, whereby a first catch grid of the first variant is attached to the support device. Fig. 8A bis Fig. 8E This illustrates the procedure for attaching a safety net to a support structure on which several safety nets are already installed. Variant. Fig. 9 The first variant of the support device according to the invention with safety catch is shown with a precast concrete element placed on top. Fig. 10 The first variant of the support device according to the invention with safety catch, with crossbeams and formwork elements placed on top, is shown.

[0070] The Figuren 1 bis 3 show a first variant of the support device 1 according to the invention with a safety catch 2. Fig. 1 and Fig. 2 The support device 1 has several telescopic supports 3 arranged at regular intervals on a base 15. Each support 3 has a head 12. A first yoke 4a is connected to several head 12s arranged in a line. A second yoke 4b is connected, essentially parallel to the first yoke 4a, to several head 12s arranged in a line. The first yoke 4a and the second yoke 4b are preferably designed as I-beams, preferably made primarily of wood. Opposite ends of a first transverse stiffener, in the example shown a first crossbar 5a, are reversibly and detachably attached to a first head 12a and a second head 12b, preferably suspended, so that the first transverse stiffener, here the first crossbar 5a, forms a tensile and compression-resistant connection between the first yoke 4a and the second yoke 4b.Opposite ends of a second transverse stiffener, in the example shown a second crossbar 5b, are reversibly and detachably attached to a third head section 12c and a fourth head section 12d, preferably by hooking them in such a way that the second transverse stiffener, here the second crossbar 5b, forms a tensile and compressive rigid connection between the first yoke beam 4a and the second yoke beam 4b. A safety catch 2, which has a catch grid 6, is placed on the first crossbar 5a and on the second crossbar 5b, so that the safety catch 2 covers a gap 14 extending between the first yoke beam 4a and the second yoke beam 4b.

[0071] As in Fig. 3 As can be seen, the collection grid 6 in the first variant has a first end region 7a, a second end region 7b, and a plurality of grid elements 13, which are formed by a plurality of longitudinal elements 13a and transverse elements 13b. Together, the longitudinal elements 13a and the transverse elements 13b form a grid surface 9. The grid surface 9 is bounded longitudinally by two longitudinal stiffening elements 10 and transversely by two transverse stiffening elements 11. In the example shown, both the longitudinal stiffening elements 10 and the transverse stiffening elements 11 are designed as square tubes. At each end of each longitudinal stiffening element 10, a stop hook 8 is arranged in the example shown. The indentation 16 of each stop hook 8 is oriented towards the grid surface 9. The longitudinal stiffening elements 10 project beyond the grid surface 9 in the longitudinal direction. This results, as shown in Fig. 1 and Fig. 2 It is evident that an overlap of the grid surfaces 9 of two longitudinally adjacent catch grids 6 is avoided. An exception is the first catch grid 6a, which directly adjoins a transverse wall 18. Here, an overlap 17 occurs with the longitudinally adjacent second catch grid 6b. In the assembled state of the fall arrest system 2, the first end section 7a of the catch grid 6 rests on the first crossbar 5a, and the second end section 7b of the catch grid 6 rests on the second crossbar 5b. The catch grid 6 is only placed on the crossbars 5a and 5b and is not attached to them by any other fasteners. The stop hooks 8 limit the longitudinal movement of the placed catch grid 6. In the transverse direction, the movement of the catch grid 6 is limited by the yoke beams 4a and 4b.

[0072] The Figuren 4 bis 6 Figure 1 shows a second variant of the support device 1 according to the invention with safety catch 2. The construction of the support device 1 with safety catch 2 corresponds to that of the first variant.

[0073] As in Fig. 6 As can be seen, the collection grid 6 in the second variant has a first end region 7a, a second end region 7b, and a plurality of grid elements 13, which are formed by a plurality of longitudinal elements 13a and transverse elements 13b and together form the grid surface 9. The grid surface 9 is bounded by two longitudinal stiffening elements 10 and two transverse stiffening elements 11. The longitudinal stiffening elements 10 are designed as profile tubes, the transverse stiffening elements 11 as double wire. A stop hook 8 is arranged at each of the two ends of each longitudinal stiffening element 10. The indentation 16 of each stop hook 8 faces the grid surface 9. In the second variant, the grid surface 9 extends to the end of the longitudinal stiffening elements 10. As in Fig. 4 and Fig. 5 As can be seen, this results in an overlap 17 of the grid surfaces 9 of two longitudinally adjacent catch grids 6. In the assembled state of the safety barrier 2, the first end section 7a of the catch grid 6 rests on the first crossbar 5a, and the second end section 7b of the catch grid 6 rests on the second crossbar 5b. The catch grid 6 is only placed on the crossbars 5a and 5b and is not otherwise attached to them. The stop hooks 8 limit the longitudinal movement of the placed catch grid 6. In the transverse direction, the movement of the catch grid 6 is limited by the yoke beams 4a and 4b.

[0074] Based on the Fig. 7A bis 7E The installation of a safety grid 6 at an end of the support structure 1 adjacent to a wall 18 is illustrated. A gap 14 extends between the first yoke beam 4a and the second yoke beam 4b, which is bridged by a first crossbar 5a and a second crossbar 5b ( Fig. 7A ). The catch grid 6 is suspended from the first crossbar 5a by means of two stop hooks 8, which are attached to a first end region 7a of the catch grid 6, so that the catch grid 6 hangs down essentially vertically ( Fig. 7B Using a forked mounting rod 19, the collection grid 6 is pivoted upwards, with the first crossbar 5a serving as the pivot axis. The second end section 7b of the collection grid 6 thereby approaches the second crossbar 5b ( Fig. 7C ) In order to raise the second end section 7b of the catch grid 6 over the second crossbar 5b, the catch grid 6 is moved longitudinally on the first crossbar 5a using the forked mounting rod 19, so that the second end section 7b moves away from the second crossbar 5b ( Fig. 7D ). Then the second end section 7b of the catch grid 6 is lifted above the height of the second crossbar 5b using the forked mounting rod 19 and placed on the second crossbar 5b ( Fig. 7E ).

[0075] The installation of additional collection grids 6 is in the Fig. 8A bis 8E Illustrated. This is analogous to the one in Fig. 7A bis 7E The procedure described above was followed, so reference is made to the above explanations to avoid repetition.

[0076] Fig. 7A bis 7E and Fig. 8A bis 8E show the first variant of the support device according to the invention with safety device, as shown in Fig. 1 bis 3 as illustrated, in which the collection grids 6 can be installed in any order. In the second variant of the support device with collection safety device according to the invention, as shown in Fig. 4 bis 6 As shown, due to the overlap 17 of the grid surfaces 9, the collection grids 6 cannot be installed in any order, but the installation must be started at one end of the support device 1 and continued in the longitudinal direction.

[0077] If the support device 1 serves as a support for one or more precast concrete elements 20, as in Fig. 9 As shown, the precast concrete elements 20 are placed directly onto the yoke beams 4a, 4b.

[0078] When using support device 1 for slab formwork, as in Fig. 10As shown, several crossbeams 21 are placed transversely on the yoke beams 4a, 4b, and the formwork elements 22 are then placed on these. This applies to both the first and the second variant of the support device with fall protection according to the invention. Reference symbol list:

[0079] 1 Support device 2 Safety catch 3 Supports 4a First yoke beam 4b Second yoke beam 5a First crossbar (first cross brace) 5b Second crossbar (second cross brace) 6 Catch grid 6a First catch grid 6b Second catch grid 7a First end section 7b Second end section 8 Stop hook (stop element) 9 Grid surface 10 Longitudinal stiffening element 11 Cross stiffening element 12 Head section 12a First head section 12b Second head section 12c Third head section 12d Fourth head section 13 Grid element 13a Longitudinal element 13b Cross element 14 Gap 15 Substrate 16 Recess 17 Overlap 18 Wall 19 Forked mounting rod 20 Precast concrete element 21 Crossbeam 22 Formwork element

Claims

1. Method for constructing a fall arrest system (2) on a support device (1) for a formwork element (22) or a precast concrete element (20), comprising the steps of: a) providing the support device (1), which has: - an arrangement of supports (3), - a first and a second crossbeam (4a, 4b) connected to the arrangement of supports (3), - a first and a second transverse stiffener, preferably a first and a second crossbar (5a, 5b), to form a tensile and compressive rigid connection between the first and the second crossbeam (4a, 4b), b) providing a fall arrest grid (6) to secure a gap (14) between the first and the second crossbeam (4a, 4b), characterized by the fact that The provision of the catch grid (6) (step b)) comprises: a1) connecting a first end region (7a) of the catch grid (6) to the first transverse stiffener (5a), wherein the catch grid (6) is arranged in an intermediate position directed downwards from the first transverse stiffener (5a); a2) pivoting the catch grid (6) about a pivot axis formed by the first transverse stiffener (5a); a3) connecting a second end region (7b) of the catch grid (6) to the second transverse stiffener (5b), so that the catch grid (6) is arranged in a securing position that secures the space (14) between the first and the second yoke beam (4a, 4b).

2. Method according to claim 1, characterized by the fact thatWhen pivoting the collection grid (6), i. the first end section (7a) of the collection grid (6) is moved away from the second cross-brace (5b) on the first cross-brace (5a), ii. the second end section (7b) of the collection grid (6) is raised above the second cross-brace (5b), iii. the first end section (7a) of the collection grid (6) is moved towards the second cross-brace (5b) on the first cross-brace (5a), and iv. the second end section (7b) of the collection grid (6) is lowered onto the second cross-brace (5b).

3. Method according to claim 1 or 2, characterized by the fact that Before pivoting the collection grid (6), at least one stop element (8) of the collection grid (6) is hooked onto the first transverse stiffener (5a).

4. Method according to any one of claims 1 to 3, characterized by the fact thatBefore pivoting the collection grid (6), two stop elements (8) of the collection grid (6) spaced apart in the transverse direction are hooked onto the first transverse stiffener (5a).

5. Method for manufacturing a precast concrete slab, comprising the steps of: providing a safety catch (2) on a support device (1) according to any one of claims 1 to 4; and placing a precast concrete element (20) onto the support device (1).

6. Method for constructing a slab formwork, comprising the steps of: providing a safety catch (2) on a support device (1) according to one of claims 1 to 4; and placing a formwork element (22) on the support device (1).

7. Support device (1) with safety catch (2), comprising: an arrangement of supports (3), a first and a second yoke beam (4a, 4b) connected to the arrangement of supports (3), a first and a second transverse stiffener, preferably a first and a second crossbar (5a, 5b) arranged substantially perpendicular to the first and second yoke beams (4a, 4b), a safety catch (6) for securing a space (14) between the first and the second yoke beams (4a, 4b), characterized by the fact that a first end area (7a) of the collection grid (6) is connected to the first transverse stiffener (5a) and a second end area (7b) of the collection grid (6) is connected to the second transverse stiffener (5b).

8. Support device (1) according to claim 7, characterized by the fact that the collection grid (6) has at least one stop element, preferably at least one stop hook (8), to limit a displacement of the collection grid (6) in at least one direction.

9. Support device (1) according to claim 7 or 8, characterized by the fact that the collecting grid (6) has at least one longitudinal stiffening element (10) on at least one of the opposite longitudinal sides, preferably on both opposite longitudinal sides, of the grid surface (9).

10. Support device (1) according to claims 8 and 9, characterized by the fact that that at least one stop element (8) is connected to at least one longitudinal stiffening element (10).

11. Support device (1) according to claim 9 or 10, characterized by the fact that the longitudinal stiffening element (10) extends beyond the grid surface (9) in the longitudinal direction.

12. Support device (1) according to one of claims 7 to 11, characterized by the fact that the collection grid (6) has at least one transverse stiffening element (11) which limits one of the opposite transverse sides of the grid surface (9).

13. Support device (1) according to one of claims 7 to 12, characterized by the fact thatthe supports (3) each have a head section (12), wherein the first and second transverse stiffeners (5a, 5b) are attached to the head sections (12) of the supports (3).

14. Support device (1) according to one of claims 7 to 12, characterized by the fact that The first and second cross stiffeners (5a, 5b) each have a bracket at opposite ends for mounting on the first and second yoke beams (4a, 4b).

15. Support device (1) according to one of claims 7 to 14, characterized by the fact that the collection grid (6) has at least one grid element (13) made of a dimensionally stable material, preferably metal.

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