DE306552C

DE306552C -

Info

Publication number: DE306552C
Application number: DENDAT306552D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

Den Gegenstand der Erfindung bildet eine Anordnung an dem Fahrwerk von fahrbaren Turmdrehkranen, durch die auch bei ,Unebenheiten der Fahrbahn eine unzulässig große Belastung einer Ecke stets mit Sicherheit vermieden werden soll.The subject of the invention forms an arrangement on the chassis of drivable Tower cranes, which also cause unevenness in the roadway an impermissibly large Loading a corner should always be avoided with certainty.

Die Erfindung beruht auf nachstehender Überlegung: Bei einem derartigen Kran verteilt sich gewöhnlich die Last auf vier Ecken.The invention is based on the following Consideration: With a crane of this type, the load is usually distributed over four corners.

ίο Es ist jedoch ohne weiteres klar, daß die Art, wie sich die Last auf die einzelnen Ecken verteilt, nicht ' sicher bestimmt ist, da ein Gegenstand nur dann statisch bestimmt unterstützt ist, wenn er auf drei Stützen ruht. ίο It is quite clear, however, that the species how the load is distributed over the individual corners is not 'definitely determined because a The object is only statically supported when it rests on three supports.

Die Fig. 1 und 2 stellen z. B. das gleiche Portal eines Portaldrehkranes im Grundriß dar. Das Gewicht Q des ganzen Kranes sei augenblicklich bei beiden Figuren an derselben Stelle vereinigt. Der dabei auftretende größte Raddruck bei A kann alsdann nach zwei Arten bestimmt werden. Er istFigs. 1 and 2 represent, for. B. shows the same portal of a gantry crane in plan. The weight Q of the entire crane is instantly combined in the same place in both figures. The greatest wheel pressure occurring at A can then be determined in two ways. He is

i. nach Fig. 1: ■, .i. according to Fig. 1: ■,.

2. nach Fig. 2:2. according to Fig. 2:

α -\-b c -\- dα - \ - b c - \ - d

e+fe + f

Nun ergibt die Berechnung nach Fig. ι kleinere Werte als diejenige nach Fig. 2. Liegt z. B. der Schwerpunkt gerade auf Mitte Portal, so ergibt sich der EckdruckThe calculation according to FIG. 1 now results in smaller values than that according to FIG. 2. Is z. B. the focus is straight on the middle Portal, this gives the corner pressure

1. nach Fig. 1 zu1. according to Fig. 1 to

2. nach Fig. 2 zu2. According to FIG. 2

' 1' 1

Man erkennt daraus, wie wichtig es ist, die Konstruktion so zu wählen/daß stets die Berechnung nach Fig. 1 zulässig erscheint. Dies ist immer dann der Fall, wenn die Linie A -C (oder B-D) nicht steif ist, sondern, wenn die Räder B und D (oder A und C) nicht aufliegen, so weit durchsinkt,; bis die freien Räder zum Tragen komm,en;" Dann verteilt sich die Last annähernd in der bei Fig. 1 angenommenen Weise auf die yier Räjler. Aber das erwähnte Nichtaufliegen!: einzelner Räder kann bei steifen Portalen sehr leicht eintreten, sobald Ungenäuigkeiten in der Lagerung der Schienen vorhanden sind. Dann muß nach Fig. 2 gerechnet werden.This shows how important it is to choose the construction in such a way that the calculation according to FIG. 1 always appears permissible. This is always the case when the line A -C (or BD) is not stiff, but rather when the wheels B and D (or A and C) are not in contact, it sinks so far; until the free wheels come into play; "Then the load is distributed over the yier wheels approximately in the manner assumed in FIG The rails are in place, then you have to calculate according to Fig. 2.

Solche steifen Portale sind nun stets bei höheren Kranen vorhanden, ζ. B. bei den sogenannten Turmkranen. Hier ist die Diagonale A-C (und B-D) wegen des hohen Turmaufbaues durchaus steif, und hier mußte also bisher immer mit einer Höchstbelastung nach Fig. 2 gerechnet werden. \,~ Such rigid portals are now always present with higher cranes, ζ. B. in the so-called tower cranes. Here the diagonal AC (and BD) is quite stiff because of the tall tower structure, and a maximum load according to FIG. 2 has always had to be expected here. \, ~

Es entstehen bei den hier auftretenden großen Drücken dadurch sehr ungünstige Verhältnisse, die besonders störend werden, wenn der Kran ζ. B. auf einer besonders herge-The high pressures occurring here result in very unfavorable conditions, which are particularly annoying when the crane ζ. B. on a particularly

LagerexenipiarCamp retirees

Claims

provided gangway works, which is then dimensioned for significantly higher pressures. Even in the case of concrete foundations, the question is of importance. _ J

The invention is intended to remedy this drawback by allowing the wheel pressures always to be calculated according to Fig. ι.

Fig. 3 shows the lower part, a tower crane ι in front, the one at the four corners by two each

ίο wheels 2 is supported. The two wheels one Corner are each stored in a balance beam 3 for the purpose of pressure compensation. This balance beam is now not, as usual, directly, but by means of a link 4 with the supporting structure connected to the tower. The · handlebars are arranged at a slight angle. So now the wheel carts do not move outwards under the pressure of the upper part, they are connected to one another by a rigid tie rod 5. This pull rod holds the wheel carts but only in equilibrium as long as both wheeled carts are equally loaded. But if the crane turns ζ. B. with the load on the left wheeled cart, it is stronger burdened than the one on the right, and the two wheeled wagons connected to one another would thus ^ with dodge to the left.

In order to limit this evasion, the tie rod 5 with the tower frame is through a spring 6 connected so that a horizontal longitudinal displacement of the pull rod against the scaffolding, as it would be done if the wheeled carts dodged, only with simultaneous compression of the spring in restricted! Dimensions is possible. This is also expediently biased so that it is a can take some load without being compressed.

If now, as a result of inaccuracies in the path and rigidity of the tower, another The wheel pressure of the most heavily loaded left corner increases while the When pressure is applied to the right corner, the load on the spring also increases; this gives after, and the left wheeled trolley deviates slightly upwards compared to the crane frame while the right wheeled cart is lowered accordingly. This is so long until the wheel pressures calculated according to FIG. 1 are approximately restored to have. '' ■

It is evident that this arrangement significantly increases security is created for both the crane and the runway. Also make up possible subsidence of the career, which cannot always be completely avoided and in which stiff crane means a danger, immediately noticeable through play of the spring and can be eliminated as they arise.

The arrangement can also be such that the spring is laid in the crane frame itself. For this purpose, the lower part of the portal is designed like a console, so that the outer struts 1 are inclined at an angle. Then either while dodging enter the roller boxes in itself sufficient ^to: or they are overlaid with their upper ends rotatably supported in the tower structure. The suspension is switched on between the lower ends of the middle 7 "diagonal struts and the horizontal connecting rod of the roller boxes.

P at en τ-claim ε. ·

. ι. Undercarriage for mobile tower cranes or the like, characterized in that the Crane frame against the wheel racks (3) by inclined, from top to bottom outwards directed handlebar (4) is supported, and that the two wheel racks each one Tower side are connected to each other by a rigid tie rod (5), the horizontal Longitudinal displacement against the tower structure is limited by a spring (6).

2. Chassis according to claim 1, characterized in that the handlebars (4) the outer diagonal struts (1) of the console-like lower crane frame part are used, the rigid tie rod is formed by its lower horizontal connecting rod and the spring (6) in the junction of the central crane frame diagonal struts and of the lower connecting rod is inserted.

1 sheet of drawings.