Suspended scaffold

Abstract

The invention relates to a suspended scaffold (1) to be attached to a roof (18) of a building, which scaffold has crossbeams (5) which are provided with accessible platforms (6) and which form a working platform (4). According to the invention, the crossbeams (5) are supported on the side facing away from the roof (18) by supports (19-21) which are anchored to the building at the other end.

Description

[0001] The invention relates to a suspended scaffold to be attached to, in particular in front of, a roof, which has crossbeams provided with walkable surfaces such as planks, gratings or the like, for example 3-point crossbeams, preferably 4-point crossbeams.

[0002] In contrast to a scaffold that rests on a horizontal foundation, US 4 676 341 A discloses a scaffold that can be placed on sloping surfaces and fixed to them.

[0003] Suspended scaffolding is used where conventional scaffolding cannot be erected, for example on bridges, towers (as was the case with the towers of Cologne Cathedral), and similar structures. Grid-like 3-point trusses or, preferably, 4-point trusses are used, which are characterized by their low weight and high stability.

[0004] CN 107 035 130 A ofenbart is a very special, ring-shaped work platform enclosing a mast, which is supported against the mast by struts. Due to the exploitation of the symmetry property of such a support arrangement, transferring such a technique to other structures is hardly possible.

[0005] Erecting scaffolding around a building for work on the ridge of a pitched roof, and especially on towers like church steeples for work on the spire, is complex, time-consuming, and material-intensive. The newspaper article "The St. Matthew's Church in Löhne has a new spire" by Ulf Hanke on nw.de describes a type of suspended scaffolding that can be erected very quickly with comparatively little material.

[0006] The invention is defined by a suspended scaffold according to claim 1.

[0007] Advantageously, the suspended scaffold can be largely completed on the ground, and then moved into a working position by, for example, a crane.

[0008] However, the preferred method is to transport the suspended scaffold, possibly in pre-assembled sections, into its working position using a cableway. This position is fixed to the building and anchored to the ground. This alternative is not only more cost-effective than a crane, but also very space-saving and therefore ideally suited for, for example, narrow churchyards.

[0009] In the working position, the supports are anchored securely to the building. Naturally, sufficient load-bearing capacity of the supports must be ensured during anchoring. While anchoring the supports can, in principle, also be done in the masonry of a building, fixing them to the roof truss, especially to rafters, is preferred. The advantage is that such a rafter can be secured with carriage bolts, allowing for a pull-out-resistant fixing. In a side view, the roof pitch and the supports then form an upward-opening V.

[0010] According to the invention, for work in the area of ​​the tower top at a considerable height on the work platform, a ring-shaped guide for a crane boom is provided. Such a crane boom ensures easy material transport. Its orientation can be adapted to the respective building structure due to the ring-shaped guide.

[0011] In a conventional manner, the suspended scaffold is further secured by the measure that crossbeams are anchored to the building on the roof side with scaffold anchors, preferably to the timbers of the roof truss.

[0012] According to the invention, the trusses are designed to form a ring shape enclosing the roof or a tower top, e.g. an ellipse or a circle, or a polygon.

[0013] This allows for simple and cost-effective maintenance of, for example, the tower ornament, such as a cross, a rooster or a weather vane of a church tower, which is enclosed by the suspended scaffolding.

[0014] In its design, the structure further incorporates outriggers attached to the crossbeams at right angles, pointing away from the roof. The free ends of these outriggers are supported by the columns. For a ring-shaped structure, at least three columns are required for stability. Advantageously, the outriggers are designed like the crossbeams, preferably as four-point crossbeams. A stable connection of the outriggers to the crossbeams can then be easily achieved, as clamps from a modular system, for example, can typically be used. This measure also has the advantage of increasing the angle between the roof slope and the columns, thus enhancing the overall stability of the work platform.

[0015] The load-bearing capacity and stability of the work platform can be further increased by connecting the outriggers to the crossbeams of a second support. The first and second supports are preferably fixed directly next to or one above the other on the building side. If the second support runs parallel to the roof slope, the two supports form an upward-opening V.

[0016] It has also proven advantageous for supports to have a mounting plate connected via a hinge for fixed attachment to the building. This allows for easy adjustment to different roof pitches. The mounting plate will also be provided with holes for screwing. Particular attention is paid to ensuring that a rafter of the roof truss is provided with corresponding holes and that the screws are inserted while enclosing the mounting plate and the rafter.

[0017] Furthermore, it can be provided that the supports for connection to the outriggers are designed as 3-point crossbeams, which have an attached round tube shaft with a mounting plate at the other end. This allows for a simple and stable connection of the supports to the outriggers for appropriate width dimensions. Connecting the mounting plate to the round tube shaft via a joint is also similarly simple, as is fixing it within the 3-point crossbeam.

[0018] A turret ornament can weigh considerably, easily several hundred kilograms. Removing such a ornament is advantageous if the scaffolding has a lifting device, for example a tripod equipped at its top with a winch or, preferably, with a rigging plate and pulleys.

[0019] This ensures a very even load distribution on the suspended scaffold, for example, when removing a turret ornament located on a central axis of the scaffold. The use of a rigging plate has the advantage that the turret ornament can then be lowered to the ground via a connected cable of the inclined cableway, without having to be repositioned.

[0020] It has also proven advantageous if the tripod is supported at the outer ends of the outriggers, as the load is then immediately transferred via the supports.

[0021] For this purpose, it may be provided that grid crossbeams are connected to the outer ends of the booms, in which the legs, e.g. tripod-forming pipes, are trapped.

[0022] This transition from a leg to a grid traverse also allows for a comparatively simple, but safe transfer of the load from the tripod to the outriggers.

[0023] The essence of the invention is explained in more detail with reference to the drawing, which only schematically and not to scale depicts exemplary embodiments. The drawing shows: Fig. 1: a side view of the suspended scaffold according to the invention, Fig. 2: a top view, Fig. 3: a support and Fig. 4: a section through a preferred guide of a crane boom.

[0024] The in the Figure 1 and 2 The suspended scaffold shown 1 is used for work on a tower top 2, for example the replacement of a tower ornament 3, here in the form of a cross.

[0025] For this purpose, the suspended scaffold 1 forms a ring-shaped work platform 4 encircling the tower top 3. The work platform 4 is formed by 4-point trusses 5, which are provided with a walkable surface 6, for example made of wood. The surface 6 can project laterally beyond the trusses 5, thus increasing the working width of the work platform 4, since the width of the trusses is typically between 40 cm and 60 cm.

[0026] In the suspended scaffold 1 shown in the drawing, the work platform 4 is octagonal. Other geometries are of course possible. The octagonal design has the advantage that straight crossbeams 10, 11 can be connected by standard 135° corner connectors 12. Figure 2 hinted at.

[0027] Straight crossbeams 10, 13, 14 are extended by cantilevers 15-17, connected at a right angle and facing away from the roof 18 of the tower spire 2. The free ends of the cantilevers 15-17 are supported by first columns 19-21. At their other ends, the first columns 19-21 are anchored to the building structure, in this case to the roof truss of the tower spire 2, via indicated mounting plates 22.

[0028] The connections of the cantilevers 15-17 to the crossbeams 10,13,14 are supported by second supports 23,24, which are fixed directly adjacent to the first supports 19-21 on the roof truss of the tower top 2.

[0029] Based on the Figure 3Such a support 25 will be explained in more detail below. For connection to the cantilevers 15-17 formed by 4-point crossbeams, the support 25 has a 3-point crossbeam 26 with corresponding dimensions. At the other end, this crossbeam transitions, for example by welding, into a central round tube shaft 27. A mounting plate 29 with openings for bolting to the building structure is connected to this round tube shaft 27 via a joint 28. This allows the support 25 to be fastened even with different roof pitches.

[0030] In addition, conventional scaffold anchors 35-37 serve to secure the suspended scaffold 1. These extend here, for example, opposite the outriggers 15-17 between the crossbeams 11, 13, 14 and the framework of the tower top 2.

[0031] The suspended scaffold 1, for example, has a design for lifting the tower ornament 3 that is only partially functional. Fig. 1The lifting device 40 is depicted as a tripod, which carries a rigging plate 41 at its apex. The legs 42-44 of the lifting device 40 are supported at the outer ends of the booms 15-17. Preferably, 4-point lattice crossbeams are provided for connecting the legs 42-44 forming the lifting device 40 to the outer ends of the booms 15-17. These crossbeams accommodate the dimensions of the booms 15-17, and the legs 42-44 of the lifting device are held in place by, for example, welded or clamped tubes.

[0032] For example, to lower a removed turret ornament 3 from the work platform 4 to the ground, a rope of a cableway anchored to the ground is attached to the rigging plate 41, not shown in the drawing.

[0033] In addition, a crane boom 45 is provided for material transport, which is movable on a ring-shaped guide 46, cf. Fig. 2. In the exemplary embodiment, the guide 46 is designed as a railing by means of a round tube 50 raised above the surface 6 of the platform 4, compare Figure 4 . Roller bearings 51, each with two rollers 52,53, are movably mounted on the round tube 50.

[0034] In the embodiment of the suspended scaffold 1, four roller bearings 55, 56; 59, 60 are provided, the distance between which is determined by a profile 61 covering the guide, cf. Fig. 4 Two vertically pivotable arms 57, 58 of the crane boom 45 are connected to the central roller bearings 55, 56. Tensioning cables 62, 63 are provided between the tip of the crane boom 45 and the two outer roller bearings 59, 60, preferably adjustable in length, to change the angle of attack of the crane boom 45 relative to the horizontal.

Claims

1. A suspended scaffold stage (1) to be secured to the roof (18) of a building and having crossbeams (5) provided with walkable surfaces (6), which form a ring-shaped or polygonal work platform (4), wherein the crossbeams (5) are carried on the side facing away from the roof (18) by supports (19-21) that are fixedly anchored to the building at the other end, characterized in that a ring-shaped guide (46) for a crane boom (45) is provided on the work platform (4).

2. The suspended scaffold stage according to claim 1, characterized in that the crossbeams (5) are fixedly anchored to the roof with scaffold anchors (35-37) on the roof side.

3. The suspended scaffold stage according to one or several of the preceding claims, characterized in that booms (15-17) are connected at right angles to crossbeams (11, 13, 14) facing away from the roof (18), and first supports (19-21) reach underneath their free ends.

4. The suspended scaffold stage according to one or several of the preceding claims, characterized in that second supports (23, 24) reach underneath the connections between the booms (15-17) and crossbeams (11, 13, 14).

5. The suspended scaffold stage according to one or several of the preceding claims, characterized in that supports (25) have a mounting plate (29) for the fixed anchors connected by way of a joint (28).

6. The suspended scaffold stage according to one or several of the preceding claims, characterized in that supports (25) for connection to the booms (15-17) are designed as 3-point crossbeams (26), which at the other end have an attached round tube shaft (27) with fastened mounting plate (29) .

7. The suspended scaffold stage according to one or several of the preceding claims 3 to 6, characterized in that the suspended scaffold (1) has a lifting device (40).

8. The suspended scaffold stage according to claim 7, characterized in that legs (42-44) of the lifting device (40) are supported on outer ends of the booms (15-17).

9. The suspended scaffold stage according to one or several of the preceding claims 7 or 8, characterized in that grid crossbeams are connected at outer ends of the booms, with the legs trapped therein.

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