4. 8. 2011
In this contribution is described a structural design and a solution of system attachment of supporting wheels for the given rotational platform in airplane parking in hall. In the contribution is also presented a structural modification of peripheral beams in the already realized airplane platforms with regard to their deformation.

 

In present are rotational loading platform for airplane parking realized in hall for airplane, i.e. in hangars. These airplane platforms serve mainly for airplanes parking and for an efficient manipulation with airplane in terms of effective using of hangar area. These platforms were created in Europe and are realized for example in Germany on airports Donaueschingen, Porta-Westfalica, Braunschweig, Munster-Telgte and in Swiss on airport Grenchen (Fig.1), etc.

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Submitter of this object commission of rotational platform is the German firm ALTO GENERAL AVIATION SERVICES GmbH, in Eltville. According to the project it is device with designation “Rundpardeck CS 32 000”, which can rotate around vertical axe by centre bearing and in perimeter will be supported by 30 pieces of supporting wheels.

By project will be on platform park four airplanes Falcon. Weight of one airplane is approximately 24 000 kg. Among these airplanes will be parked another four small sport airplanes with weight of one airplane approx. 2 000 kg. Construction will be realized in Antwerp in Belgium. This is the largest rotational airplane hangar platform in Europe with diameter approx. 32 m.

 

Structural design of wheel supporting system

According to the obtained drawing documentation of actual platform, drawing documentation of exist systems of supporting wheels and by requirements of contractor was realized design of systems attachment of supporting wheels for rotational airplane platform with load capacity of one wheel 30 000 kg.

The function of systems attachment of supporting wheels is holding mainly vertical loading form platform, transposed to wheels through peripheral beams with the “I”-shaped cross- section (the HEA profile), and loading form rotation of platform around the vertical axe.

In association with restricted conditions mainly relate with height of peripheral concrete base and used peripheral structural elements was needed design the supporting wheel in restricted interval dimensions.

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The system of supporting wheels is setting in horizontal and also in vertical direction by two twin bolts. Bolts twins transposed the vertical loading are designed by P363. By requirements of solution was realized static linear stress analyse of system attachment of wheels. From results of analyse and numerical calculations of some elements was for system attachment of supporting wheels designed material S355, which corresponds with design of material S355 used for peripheral beams and for other support structural elements of airplane platform.

During vertical loading of wheels systems occurs the deformation of bottom plate in two directions, it causes supplement-loading effects to other parts of system. In agreement with contractor of work started solution for support of bottom plate with closed thick wall cross-section. After setting of wheels height by bolts to place between closed cross-section and concrete base is placed sheets with suitable thickness (Fig.4).

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The design of wheels was realized, in this case, as conservative, by Hertz theory for straight line contact (Fig.5) and by recommendation of the STN 731401. The system attachment of supporting wheels is founded by complete drawing documentation for manufacturing.

Structural modification of peripheral beams

With the function of rotational platforms and their location in hall for airplane is associated structural distribution of structure elements (Fig.2, 3). In terms of distribution and using cross-sections of structural elements to arrive in exist rotational platform k deformation of bottom flanges of peripheral beams (Fig.6, 7, 8).

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To possible causes of bottom flanges deformation of peripheral beams belong:

– direct impact of wheels caused eccentricity among wheels and wall of peripheral beam (Fig.9),

– unsuitable connections between peripheral beam arcs (Fig.6),

– torsion of peripheral beam, produced their arc shape (Fig.10, 11, 12).

In reality may be occurred combination of effects from presented causes.

Peripheral beams are realized as arcs connected to circle of platform. Connections between peripheral beams and timbers, directed to centre bearing, is realized bolts joints and connections to wood floor prisms are realized sheets welded to wall of peripheral beams (Fig.13, 14).

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After study of extended documents and materials and consequent analyse was design recommendations for elimination of bottom flanges deformation of peripheral beams:

– Checking and setting of attachment systems of supporting wheels,

– Checking and setting of connections of peripheral beams arcs,

– Connections of wood prisms to peripheral beam realize welded sheets in the form transverse stiffeners from upper to bottom flange of peripheral beam, eliminate potential buckling of wall and flange from supporting wheels (Fig.15),

– On some places of peripheral beam weld longitude sheets, which on these places create from peripheral beam local closed cross-sections, eliminate torsion effects made of peripheral beam arc and timbers (Fig.10, 11, 12).

 

References

[1] Eurocode 3 (EC3) – Design of steel structures, CEN,

[2] Eurocode 1 (EC1) – Actions on structures, CEN,

[3] Steel building design: Design data, SCI, BCSA, Tata Steel, Publication P363, 2009,

[4] STN 73 1401 – Navrhovanie oceľových konštrukcií, SÚTN, 1998.

 

TEXT/PHOTO: Ján BURÁK and coll.

Reviewers

Jozef Krištofík, Ludo Betko, Oskar Ostertag

 

Systém pripevnenia nosných kolies

Tento príspevok, popisujúci konštrukčný návrh a pevnostnú analýzu sytému nosných kolies rotačných plošín pre lietadlá a konštrukčnú úpravu obvodových nosníkov plošiny, bol vypracovaný v súlade rámca projektu VEGA 1/0356/11 Inovačné procesy v konštrukcii pohonných jednotiek dopravných prostriedkov, strojov a optimalizácia materiálových tokov a logistiky za účelom úspory energie a zvýšenia spoľahlivosti pre aplikačné potreby v praxi.