DE8707104U1 - Metal beams for scaffolding with two continuous piping grooves in at least one chord tube - Google Patents

Description

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Description

The invention relates to a metal truss girder for use in scaffolding construction, primarily for the construction of temporary halls and roofs as well as for bridging, suspensions and the bracing of towers.

State of the art.

Temporary roofing and tents in stationary and mobile versions are increasingly used in the construction industry, especially during repair and restoration work, to protect the building and/or workers from the effects of the weather during work.

In addition to tents, scaffolding structures are primarily used as a supporting structure, which are mostly covered with tarpaulins. As a rule, lattice girders are used as roof trusses, which are reinforced with scaffolding tubes and scaffolding couplings. In order to achieve a watertight roof, the roof skin is always arranged at the top and must not be penetrated by structural components or fastening devices. This means that the braces and bars that are essential for stability must be arranged under the roof skin, and for static reasons, as directly below the top chord as possible. Sagging of the tarpaulins between these reinforcements, and thus the formation of water pockets, cannot be avoided without attaching a solid base made of planks or metal frames made especially for this purpose (DE 3421742 Al). While the application of a plank support requires additional high labor costs, the metal frames mean additional material storage, as these can only be used for roofing. In both methods, the tarpaulins must be attached to the substructure, which requires additional effort.

For the construction of temporary roofs, primarily tents, profiles with grooves for pulling in tarpaulins with piping are known. However, these profiles are only to be used as roof supports; the reinforcement is provided by special parts that can only be used for this purpose and that only allow a limited variation in the span and the distance between the supports. The tarpaulins must be made from one piece. In the case of a tarpaulin joint, the joint can be sealed between the supports by overlapping the two tarpaulins accordingly; however, within the groove, the piping of the tarpaulins can only be butt-jointed and in practice this means a gap between the ends of the two tarpaulins through which water can penetrate into the roof.

Description.

The object of the invention is to achieve a significant rationalization in scaffolding construction, primarily in the construction of temporary roofs and halls in a modular system by

Significant savings in installation due to the simple attachment of the tarpaulins without additional fastening parts or support elements.

less material stockpiling due to the versatile use of the metal beam in different application areas, e.g. as a roof truss and as a bridging or bracing beam.

Integration of the metal support into a modular system with optimal adaptation to the respective structural conditions and use of the stiffening material with coupling-free, self-locking connections.

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When using aluminum parts, there is a significant weight saving, which also allows larger units to be manufactured by hand.

The object of the invention is a metal lattice girder made of round tubes with the diameter of the respective scaffolding system (e.g. German standard 48.3 mm or US standard 50.6 mm), <Fig.l>, preferably made of aluminum. At least one girder tube is equipped with two longitudinal grooves <Fig. 1 &ugr; 2 (1)> for pulling in tarpaulins equipped with braces. Vertical posts (rungs) are attached between two girder tubes, the length of which is such that at least two stiffening parts can be connected to each rung.

To increase the load-bearing capacity, diagonal braces can be inserted between the posts <Fig. 1>. The beam can be manufactured in different lengths, whereby the individual lengths are preferably a multiple of the grid dimension of the vertical posts and the beams are designed asymmetrically in order to maintain the grid dimension continuously when several beams are put together.

The tube diameter of the straps and posts as well as the grid dimensions are adapted to the respective scaffolding system in order to enable the use of standardized, usually existing scaffolding components with self-locking, coupling-free claw connections (horizontal, diagonal, bars). These components are connected centrally so that optimal force introduction is guaranteed.

The main components of the beam are connecting elements that can be attached underneath the lower flange, even when the tarpaulin is retracted. These connecting elements are designed in such a way that the posts and struts are directly connected to the lower flange when the tarpaulin is retracted. The position of the posts and struts is fixed by the holes in the beams arranged in a grid. <Fig. 6&iacgr; Since the local conditions

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However, if the position of the posts is often required to be precisely adjusted, these connecting elements can be used to attach another tube of the scaffolding system below the lower chord, parallel to it, to which the posts and braces can be connected steplessly. <Fig.7> This is particularly important, for example, for roofing for repair work on highways, as fixed dimensions with narrow I

Tcleranzen are specified.

When used for temporary roofs, the metal support as a roof truss is preferably installed in such a way that the belt with j keyways is at the bottom and the tarpaulin is thus drawn in at the level of the jj lower belt. <Fig. 9>. In this way, the \ required roof bracing and crossbars (7), (8) can be installed above the tarpaulin, unlike all known designs of temporary roofs, so that the tarpaulin hangs freely between the lattice girders as a kind of wide gutter (9) and water drainage is ensured without the installation of additional parts.

Pulling the tarpaulins, which are equipped with piping on both sides, into the belt tubes eliminates the need for any additional fastening material and the additional fastening of the tarpaulins to the substructure that would otherwise be necessary.

In the case of tarpaulin joints in the roof plane, sealing can be achieved by cutting out the tarpaulins with overlaps between the metal supports, but in the area of the grooves in the pipes, the only option is to butt the piping. In practice, tolerances must be taken into account here that rule out complete sealing of the roof. Only tarpaulins of a certain length can be used for each span. In the rental business, this means that a large number of tarpaulins must be kept in stock. The subject matter of the invention allows tarpaulins to be attached in two or three levels. This creates the prerequisite for tarpaulins to be butted together in an overlapping manner and, by varying the overlap width, to determine this in such a way that standard tarpaulins of certain lengths can be used. The prerequisites

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for the insertion of the tarpaulins in different levels J

can be achieved by: I

&diams;Use of metal supports with piping grooves in both |

Gird.

*Installation of a connecting piece through which the assembly "-.

of metal supports with bottom pipe with piping groove with %

Metal supports with upper belt tube with piping groove i

possible. The connecting piece is designed in such a way that in |

When assembled, f tarpaulins can be inserted at the joint. <Fig.6>&psgr;

*Assembly of metal beams of different heights, \ where the higher beams are equipped with grooves in both chord tubes and the assembly is carried out in such a way that the lower beam is arranged below the higher beam and the joint is carried out in such a way that the lower chord is flush and the upper chord is offset and can be pulled from the lower beam over the joint j into the upper beam, while tarpaulins with an overhang are pulled into the upper chord of the higher beam, which extends over the joint on both sides, which covers the s

Seals the beam and tarpaulin joint. <Fig. 5> (

*Ridge pieces on gable roofs, which allow the insertion of tarpaulins in |

a level above the top flange of the metal beams. i

Ridge pieces are generally used for gable roofs, regardless of whether metal supports with one or two chord tubes with piping grooves are used. The ridge pieces, whose construction height is generally around a third greater than that of the supports, are available in two versions.

1 Two support elements welded together at the angle of the roof pitch have a curved hole with key grooves attached above the upper chord so that both ends are open, allowing tarpaulins to be pulled in.

2 The upper and lower chords of the ridge pieces are bent in a radius corresponding to the roof pitch, while the lower chords are butt-jointed so that the piping groove runs from eaves to eaves over the ridge piece.

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the top chords of the metal supports used as roof trusses are connected to the outer posts of the ridge piece so that the top chords of the ridge piece are open.

The same procedure is used for both versions: The roof tarpaulins are pulled into the chord tubes of the supports on both sides and butt-jointed at the ridge point or, if ventilation is required, at an appropriate distance. The ridge tarpaulin is pulled into the chord tube or curved upper chord placed on the ridge piece so that the roof and ridge tarpaulins overlap widely. The ridge tarpaulins are preferably equipped with aprons on both sides, which are weighted down in the lower area with lead cords or similar, which rest on the lower tarpaulin. <Fig. 7 &ugr; 8>.

In conjunction with ridge pieces or with metal supports with a greater construction height, it is possible to arrange tarpaulins in three and one levels, which provides even greater variation when using standardized tarpaulins. <Fig.lO>.

In addition to being used as a roof truss, the metal girder can be used like any other lattice girder in normal scaffolding construction for bridging, suspension or to brace towers. These versatile applications reduce storage and allow for a quick return on investment.

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Claims (1)

· t « · Expectations. 1. Metal lattice girders for scaffolding construction, which can be assembled from one or more individual elements of different heights and can be connected to standard scaffolding components, characterized in that at least one belt tube is equipped with two longitudinal piping grooves. <Fig. 1 (1) and 2> 2. Metal truss according to claim 1, characterized in that Straps and vertical posts made of round tubes in diameter and j in the grid of the respective scaffolding system without <Fig. 1, left> or with additional diagonal bracing <Fici. 1, right> 3. Metal truss according to claim 1 and 2, characterized in that in the belts: with keder grooves, vertical holes are not only provided at the ends for the connecting bolts of two beams <Fig. 1 (?)>, but that, regardless of the beam length, further holes are arranged in the same grid at a fixed distance from these holes on one side or both sides, which also enable the connection of posts and struts when the tarpaulins are retracted. <Fig. 3 (4), (5)> 4. Metal truss according to claim 1 to 3, characterized in that Support elements of the same design with a greater height have a piping groove in both flanges and that a flange of the higher element protrudes on one side beyond the connection point with an element with a normal height, <Fig. 4> 5. Metal truss according to claim 1 to 4, characterized in that the chord tubes of the support elements for joining elements of the same height are equipped with pipe connectors on one side -2 - which are inserted into the connecting element and screwed in. <Fig. 1 (3)> b. Metal truss according to claim 1 to 4, characterized in that the elements of normal construction height are equipped with a coupling on one side in the upper chord and a pipe connector in the lower chord for connection to elements of greater construction height. <Fig. 5 (G)> 7. Metal framework beam according to claim 1 to 4, characterized in that Beam elements with a greater height with keder grooves in both chords create a bend in the lower chord, while the upper chord is bent at a radius corresponding to the angle of the bend and protrudes beyond the connection points on both sides, so that the formation of ridges for gable roofs is possible with these elements. (Fig. 6} &bull; « I «Kill » i« ·· »tint &bull;4 · tfl«·· ·