DE202015103171U1 - multi-part carrier - Google Patents

Abstract

Longitudinal, hollow-profiled carrier consisting of several support elements, which form the hollow profile of the carrier in an assembled arrangement, characterized in that the support elements (2.1 to 2.7) are formed like a frame, each frame-like support element (frame member) (2.1 to 2.7) in one piece from plate-shaped material and has at least one plate cut-out, which is bounded by a plate frame of the frame member (2.1 to 2.7).

Description

The invention relates to a longitudinally extended, hollow-profiled carrier, consisting of a plurality of support elements, which form the hollow profile of the carrier in a composite arrangement.

A carrier of this kind is from the published patent application CN 1031322649 A known. The box girder made of steel consists of two honeycomb-shaped double T-girders as well as a lid and a bottom. The honeycomb double T-beams are each composed of two parts of a conventional steel double T-beam by the double-T beam of the height h along a corresponding cutting line separated by welding and offset from each other welded together again, whereby the honeycomb structure of Double T-beam with the greater height H results. The honeycomb double T-beams, lid and bottom are welded together and form the rectangular box profile of the box girder.

Due to the hollow profile shape of the box girder and the honeycomb cutouts of the double-T girder its own weight is lower than in a carrier with the same size full cross section.

Nevertheless, the weight of such a steel box girder is so high that it is not suitable for certain structural applications, such as for lightweight constructions, such as those used in trade fair, bleachers or backdrop construction.

The invention has for its object to provide a carrier, which finds a broad application for lightweight constructions by a particularly low weight.

The object is achieved in that the support elements are frame-like, each frame-like support element (frame member) consists of one piece of plate-shaped material and has at least one plate cutout, which is bounded by a plate frame of the frame member.

The open through the generous panel cut, frame-like shape of the support elements (frame elements) in cooperation with the used thin-walled plate material creates a significant material and weight savings on these frame elements themselves, which further composed a hollow profiled carrier with a particularly favorable ratio of its mass to its cubature or its cross section. Thus, the carrier according to the invention has a low weight at the same time high flexural rigidity and load capacity.

The integral nature of the support elements (frame members) further avoids any material weakening joints that arise in conventional trusses at the intersections with possible truss braces and lead to strength losses.

An inventive hollow profile carrier with, for example, a rectangular hollow profile cross-section and open on both sides of the end is composed of at least four longitudinally extending frame elements which form the side walls of the hollow profile carrier and are joined together along their longitudinal sides.

The plate-shaped frame members are preferably connected to each other at their side edges, wherein the connection can be made cohesively and / or positively.

A cohesive connection by, for example, bonding, welding or soldering of the joints or edges of the adjacent frame elements as well as a positive connection of the edges of the adjacent frame elements by plug connections with, for example tongue and groove training, interlocking slots or dowels, each for themselves material and weight-saving compounds, which have an advantageous effect on the weight of the composite carrier.

In a further advantageous embodiment, at least one frame element is arranged extending over the hollow profile cross section of the carrier. This transversely extended frame member can be used for example as a specialist or intermediate floor and serves as an additional support element, which primarily increases the stability and torsional stiffness of the carrier according to the invention but also improves its flexural rigidity.

An inventive hollow-profile carrier with, for example, a rectangular hollow profile cross-section and end walls closed on both sides is composed of four longitudinally extending frame members and two transversely extending frame members, wherein the elongated frame members form the side walls of the hollow profile carrier and the transversely extended frame members, the end walls of the hollow profile carrier. By this arrangement, the frame members of the carrier is designed as a hollow body enclosed on all sides. By means of the end-side shelves of the hollow profile carrier several support portions of the invention are longitudinally connected to each other.

In a particularly advantageous embodiment, the frame element has a plurality of plate cutouts in such a way that a plate tray with a or a plurality of diagonally or at right angles to the plate frame extending plate strut (s) is formed.

The plate compartment ensures at the same time low weight for a particularly high flexural rigidity of the wearer and thus allows large spans, without any unwanted deflection or deformation occurs.

Furthermore, the plate compartment allows a higher load capacity of the carrier at the same time low weight.

As an advantageous feature of the one-piece plate tray over comparable trusses, which are composed of individual truss struts and have corresponding joints, a higher strength and is therefore stiffer and more durable.

Preferably, the contour transitions of the plate section are arcuate. Such contour transitions arise, for example, between two plate struts or between a plate strut and the plate frame or between two frame sections of the plate frame. Square plate cutouts are thereby avoided. Thus, the compressive and tensile stresses in the plate material of the frame elements are homogenized and the bending stiffness of the frame elements is improved, which as a result reduces the risk of breakage in the region of these contour transitions.

A further significant improvement in the beige stiffness of the carrier is achieved in that the arcuate contour transition is formed with a linearly variable radius.

Such a contour transition with a linearly increasing or linearly decreasing camber profile, in which the curvature of the curve is a continuous function of its length (also referred to as transition arc / clothoid), largely realizes a step-free transition of the rigidity conditions along the carrier.

Due to this steadily formed contour transition between the linearly extending edge and the radially extending edge of the panel cutout, the risk of breakage in the area of the contour transition is further reduced.

Preferably, the plate-shaped material of the frame member made of plywood, plywood, aluminum sheet, steel sheet or pressed cardboard. These plate-shaped materials, because of their low specific weight and relatively high strength, are particularly well suited for use with the frame member, as they promote the minimization of the wearer's own weight while maintaining its flexural rigidity.

In a favorable embodiment, it is provided that the carrier is composed of frame elements, which consist of different plate-shaped material.

The combination of frame members made of different plate material, which are assembled into a carrier, has the advantage that the most favorable plate material can be selected according to the occurring tensile, compressive or bending load of the carrier for the individual frame elements.

Particularly favorable is a combination of frame elements made of plywood and plywood, wherein the vertically, vertically arranged frame elements made of plywood and horizontally, horizontally arranged frame elements made of plywood.

This embodiment is based on the recognition that wood fibers have high resistance in the fiber direction and are therefore more resilient in the fiber direction than transverse to the fiber direction.

Plywood in which the grain directions change in the layers can therefore absorb less force in the longitudinal direction of the plate plane than plywood, since half of the layers of the plywood have a fiber direction transverse to the direction of force, which are less resilient than the layers with a fiber direction parallel to direction of force.

On the other hand, plywood only has layers with a rectified fiber layer, after which ply wood can achieve a better compressive and tensile strength in the longitudinal direction of the board plane than plywood.

On the other hand realized plywood due to the layers with changing directions of fibers better power perpendicular to the plane of the plate than plywood.

In this respect, the various properties of plywood and plywood complement each other to the effect that particularly favorable plywood for the horizontal, horizontally arranged frame elements can be used, which the pressure. or zugspannungsbelasteten upper and lower chord of the composite carrier form and plywood is favorable to use for the vertical, upright arranged frame members which receive the forces acting on the composite carrier transverse forces.

These and other features resulting from the claims, the description, the embodiments and the drawings can each be realized alone or in combination as advantageous embodiments of the invention.

The carrier according to the invention is explained in more detail below using an exemplary embodiment. The accompanying drawings show in

1 a three-dimensional view of a carrier consisting of six frame elements,

2 a detailed view of the carrier after 1 .

3 a spatial view of one 18 Frame elements existing carrier,

4 a detailed view of the carrier after 3 .

5 a detailed view (detail X off 4 ) of the plate frame of a frame member of the carrier 3 with an arcuate contour transition.

In 1 is a carrier according to the invention 1a shown according to a first embodiment. The carrier 1a consists of six frame-like supporting elements (frame elements) 2.1 . 2.2 . 2.3 which form in their enclosing arrangement the box-shaped body of the hollow profile carrier in the manner of a four-point carrier. The frame elements 2.1 . 2.2 . 2.3 consist of birch plywood, which are made in one piece from birch plywood boards, from which appropriate plate cutouts are worked out. The plate cut-outs can be milled out, for example, with a CNC milling machine, whereby the desired plate cut-outs are modeled by means of a CAD program and the data are transferred directly to the CNC milling machine.

The long side walls of the carrier 1a are made up of four equally long frame elements 2.1 . 2.2 formed, which joined together the rectangular hollow profile of the carrier 1a result. In this embodiment, the elongated frame members are made 2.1 . 2.2 made of 12 mm thick birch plywood and have a length of about 3 m.

Alternatively, in an unillustrated design, the sidewalls of the wearer 1a staggered, from different length frame elements 2.1 . 2.2 be formed (eg, 1 and 2 m long), which arranged offset to each other - in the manner of a brick dressing -, the desired total length of the side walls of the wearer 1a result.

The elongated frame elements 2.1 . 2.2 each have a plate tray with a plurality of plate cutouts, in this embodiment, the two vertically arranged frame elements 2.1 over several oppositely diagonally arranged plate struts 3 and the two horizontally arranged frame elements 2.2 over a plurality of perpendicular to the plate frame arranged plate struts 4 feature.

The plate cutouts of the vertical standing frame elements 2.1 and horizontally arranged frame elements 2.2 are designed so that in the assembled state of the carrier 1a the diagonal plate struts 3 and right-angled plate struts 4 the elongated frame elements 2.1 . 2.2 each forming crossing points.

At the two front sides of the carrier 1a are two transversely stretched frame elements 2.3 arranged as a shelf, which extend over the rectangular hollow profile cross-section and close the front side of the carrier (clearly visible in the detailed representation according to 2 ). The frontal closing shelves 2.3 according to this embodiment are made of 21 mm thick birch plywood panels.

In the shelves 2.3 in each case a substantially rectangular plate cutout is milled, that of a plate frame of the shelf 2.3 is enclosed.

All frame elements are connected to each other at the side edges by means of wooden dowels and glue.

In the plate frame of the shelves 2.3 each have four holes 5 provided, which are preferably lined with a steel bush, so that several similar carriers 1a or carrier sections 1a can be connected together in a longitudinal arrangement by means of screw.

In the present embodiment, three similar carrier sections 1a connected to a non-illustrated carrier with a span of about 9 m.

Under the use requirements in the gate construction has been shown that the construction of the carrier according to the invention 1a proves to be sufficiently stable and no visible deformation occurs on the composite beam with a span of 9 m.

The required load capacity and stability can be determined by the material chosen and / or by the selected thickness of the plate material as well as by the number and size of the plate cutouts are adapted exactly to the respective application requirements. Thus, significantly higher loads, as based on the embodiment, can be realized.

In comparison of the carrier according to the invention 1a made of plywood with a geometrically similar steel beam, the carrier 1a made of plywood at approximately the same material and manufacturing costs, only one-third of the weight of the steel beam.

In a construction of a large, multi-scene theater backdrop, which is to be positioned on a turntable with a diameter of about 15 m, including the intended for this staging in the individual scene images on a chorelike scale theater actors, it has been shown that the total load The theatrical backdrop can be significantly reduced by the use of carriers according to the invention instead of geometrically similar steel beams, so that the maximum load capacity of the hub of about 17.6 t is not exceeded despite the high staffing to still move the turntable can.

The 3 and 4 show a carrier according to the invention 1b according to a second embodiment, with respect to the carrier 1a according to the first embodiment deviating shaped frame elements 2.4 . 2.5 . 2.6 . 2.7 ,

The following is merely to the differences to the carrier 1a be received according to the first embodiment.

Matching components are given the same reference numerals.

The carrier 1b consists on the one hand of six frame elements 2.4 . 2.5 . 2.6 enclosing the body of the hollow section beam 1b form. The carrier also has 12 in the carrier 1b integrated frame elements 2.7 ,

The four elongated frame elements 2.4 . 2.5 According to this embodiment, each have a plate tray with a plurality of substantially rectangular plate cutouts, so that both the two vertically arranged frame elements 2.4 as well as the two horizontally arranged frame elements 2.5 over several perpendicular to the plate frame extending plate struts 4 feature. The right-angled plate struts 4 are compared to the diagonal plate struts 3 of the carrier 1a easier to manufacture according to the first embodiment.

The plate cutouts of the elongated frame elements 2.4 . 2.5 are formed with identical longitudinal pitch, so that in the assembled state of the carrier 1b the plate struts 4 the frame elements 2.4 . 2.5 form intersection points with each other.

At the two front sides of the carrier 1b and at the crossing points of the rectangular plate struts 4 the elongated frame elements 2.4 . 2.5 are each transversely extended frame elements 2.6 . 2.7 arranged across the rectangular hollow profile cross section of the carrier 1b extend and as frontal shelves 2.6 or integrated shelves 2.7 are formed (clearly visible in the detailed representation after 4 ).

The right-angled plate struts 4 the elongated frame elements 2.4 . 2.5 offer good mounting options for in the hollow profile cross-section of the carrier 1b integrated shelves 2.7 and enable a technologically and optically favorable integration of the shelves 2.7 ,

Through this design of the wearer 1b can be applied to the more difficult to produce diagonal plate struts 3 the frame elements 2.2 dispense with the first embodiment, the torsional stiffness and the strength of the carrier 1b are improved perpendicular to the plane of the plate. The latter reduces the risk of damage during transport and installation of the carrier 1b ,

The integrated shelves 2.7 each have a substantially rectangular plate cut-out, bordered by a plate frame.

In the two front side shelves 2.6 in each case an octagonal plate cutout is milled out.

In the frame of the two frontal shelves 2.6 each have four holes 5 provided, which are preferably lined with a steel bush to several similar carrier 1b or carrier sections 1b to be able to connect to one another in a longitudinally directed arrangement by means of screw connections.

In this embodiment, two similar carrier sections 1b connected to a non-illustrated carrier with a span of about 6 m.

The transitions of the through the milled plate cutouts of the frame elements 2.4 . 2.5 . 2.7 According to the second embodiment resulting contour are arc-shaped in a special way.

The arcuate transitions are each between a plate strut 4 and the adjoining panel frame or between two adjacent frame sections of the panel frame of a frame member 2.4 . 2.5 . 2.7 educated.

In the detail view 5 is an example of a contour transition between two frame portions of the plate frame to the outer plate cutout of one of the elongated frame members 2.4 of the carrier 1b to 3 and 4 shown.

The arcuate contour is as a transitional arch (clothoid) 6 with a radius of curvature increasing linearly up to an arc angle of 45 ° and then decreasing again linearly from 0 to 20 mm or from 20 to 0 mm.

In comparison, a circular arc-shaped transition (circular arc) 7 with a constant radius of 20 mm and a corner 8th represented with 90 ° aligned edges of the frame sections in dashed lines.

In contrast to the completely unsteady transition in the indicated corner training 8th already leads the circular arc transition 7 to a certain homogenization of the compressive or tensile stresses in the plate material of the frame elements 2.4 . 2.5 . 2.7 and thus to an improved flexural rigidity of the wearer 1b ,

In contrast to the circular arc transition 7 runs the contour of the transition arc 6 between the linear portion and the radial portion of the plate cutout without any gradation between the linearly extending edge and the radially extending edge of the plate cutout and thus completely continuous. In this way, a particularly gentle course of the change in stiffness results, whereby stress peaks are avoided and consequently the flexural rigidity of the wearer 1b to another is improved.

In a practical comparison between a carrier sections formed from the above-described invention 1b Assembled carrier with a total length of 6 m and an analogous trained carrier but with arcuate contour transitions of the plate cutouts, it has been shown that the carrier according to the invention has a small by about 15% deflection under dead load. This means in the following that the otherwise same carrier additionally provides about 20% more rigidity with negligible material and weight increase due to the special contour formation of the plate cutouts.

The invention is not limited to the above-described embodiments. From the combination of the features of the claims, the description and the drawings may result in further advantageous embodiments, which are encompassed by the invention.

LIST OF REFERENCE NUMBERS

1

Carrier, a, b

2

Supporting element, frame element, elongated .1, .2, .4, .5; transversely (shelf) .3, .6, .7

3

diagonal plate strut

4

right-angled plate strut

5

drilling

6

Transition curve

7

arc

8th

corner

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• CN 1031322649 A [0002]

Claims (9)

Elongated, hollow-profiled carrier consisting of several support elements, which form the hollow profile of the carrier in a composite arrangement, characterized in that the support elements ( 2.1 to 2.7 ) are formed like a frame, wherein each frame-like support element (frame element) ( 2.1 to 2.7 ) consists in one piece of plate-shaped material and has at least one plate cut-out, which of a plate frame of the frame element ( 2.1 to 2.7 ) is limited. Support according to claim 1, characterized in that at least one frame element ( 2.3 . 2.6 . 2.7 ) over the hollow profile cross section of the carrier ( 1a . 1b ) is arranged. Support according to claim 1 or 2, characterized in that the frame elements ( 2.1 to 2.7 ) are positively connected and / or materially connected to each other. Carrier according to one of claims 1 to 3, characterized in that the frame element ( 2.1 . 2.2 . 2.4 . 2.5 ) has a plurality of plate cutouts such that a plate tray with one or more diagonally or perpendicularly extending plate strut (s) ( 3 . 4 ) is formed. Carrier according to one of claims 1 to 4, characterized in that the contour transitions ( 6 . 7 ) of the plate section are arc-shaped. Carrier according to claim 5, characterized in that the arcuate contour transition with a linearly variable radius (transition arc) ( 6 ) is trained. Carrier according to one of claims 1 to 6, characterized in that the plate-shaped material of the frame element ( 2.1 to 2.7 ) consists of plywood, plywood, aluminum sheet, steel sheet or pressed cardboard. Carrier according to one of claims 1 to 7, characterized in that the carrier ( 1a . 1b ) of frame elements ( 2.1 to 2.7 ), which consist of different plate-shaped material. Carrier according to claim 8, characterized in that the vertically, vertically arranged frame elements ( 2.1 . 2.4 ) of plywood and the horizontal, horizontally arranged frame elements ( 2.2 . 2.5 ) consist of plywood.

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