JPS586858Y2 - Earthquake resistant crane - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to earthquake resistance technology for a swing traveling overhead crane.

A swing traveling overhead crane is an overhead crane installed on a circular traveling rail in a cylindrical building.

Ordinary straight-travel overhead cranes can reduce the horizontal excitation force exerted by the overhead crane by sliding on straight rails during earthquakes, but swivel-travel overhead cranes Since the rails are circular, the crane receives horizontal excitation force without sliding.

For this reason, in terms of seismic resistance calculations, slewing overhead cranes are extremely heavy cranes.

The object of the present invention is to provide a swinging overhead crane that has a structure that can withstand horizontal seismic force during an earthquake.

This invention has a truss structure member extended on the side of the girder to withstand horizontal seismic force, and the truss structure member prevents torsional force from being applied to the girder, thereby reducing the unreasonable force applied to the girder. The feature is that the members of the truss structure are supported on the traveling rails of the overhead crane.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, two ends of the girder of an overhead crane are mounted on a traveling rail 3 connected in a circular manner in a cylindrical building via a traveling wheel.

A trolley 1 is mounted on the girder 2 so as to be freely movable.

This trolley 1 is equipped with a hoisting device for raising and lowering a hanging tool 6 shown in FIG.

This overhead crane rotates as the girder 2 travels on the running rail 3, and furthermore, the trolley 1 travels on the girder 2 and changes to a horizontal position, so that the cargo handling work area where the lifting equipment 6 reaches can be moved into a cylindrical building. It is possible to secure almost the entire area.

As shown in FIG. 1, a truss-shaped structural member 4 is attached to the outer side wall of the girder 2 together with a support member 7, as shown in FIG.

As shown in FIG. 1, the structural members 4 are assembled to form a polygon that is approximately inscribed in the circle formed by the traveling rail 3.

Rollers 5 oriented in the tangential direction of the circle formed by the running rail 3 are attached to the corners of these polygons, respectively.

These rollers 5 are mounted on the running rail 3 as shown in FIG.

When a horizontal seismic force due to an earthquake is applied to the girder 2 in the direction of the arrow B shown in FIG. 1, the girder 2 cannot slide in the direction of the arrow B because the traveling rail 3 is circular.
Girder 2 is swung in the direction of arrow B and tends to be distorted.

If this strain is large, it may cause damage to the girder 2.

In this embodiment, as shown in FIGS. 1 and 2, a truss-shaped structural member 4 is attached to the girder 2 to increase the horizontal rigidity of the girder 2, so that the girder 2 has high strength to withstand horizontal seismic force. There is little distortion.

If the truss-shaped structural member 4 is simply attached to the girder 2,
Due to the weight of the structural member 4, the girder 2 tends to cause trouble such as being twisted in the direction of arrow C shown in FIG. 3, so the above-mentioned trouble does not occur.

When the girder 2 of the overhead crane rotates along the traveling rail 3, the roller 5 simultaneously rolls on the traveling rail 3 and does not interfere with the turning operation.

Even when the girder 2 receives a vertical seismic force, a twisting force in the direction of arrow C in Fig. 2 tries to be applied to the girder 2, but in this example, the twisting force in the direction of arrow C caused by this vertical seismic force is applied to the girder 2. Twisting force is also eliminated by supporting the structural member 4 on the traveling rail 3 side.

Furthermore, as shown in FIG. 2, if a truss is constructed in the vertical direction by the support member 7 and the structural member 4, it can be expected that the vertical strain of the girder 2 due to the vertical seismic force can be reduced, albeit slightly.

Furthermore, compared to a structure in which a truss-like structural member is simply attached to the girder 2, in this embodiment, the twisting force in the direction of arrow C in Fig. 2 can be eliminated, so a large girder can be constructed in consideration of this twisting force. Does not cause disadvantages such as adoption.

Therefore, the seismic resistance can be improved by employing a small and lightweight girder 2 as before.

This also reduces the overall weight of the overhead crane.

As described above, according to the present invention, it is possible to improve the earthquake resistance of a swing-type overhead crane that cannot be expected to move in the direction of horizontal vibration caused by an earthquake, and moreover, by adopting means for improving earthquake resistance. This has the effect of eliminating unreasonable forces such as twisting forces that are applied to the overhead crane.

[Brief explanation of drawings]

Fig. 1 is an overall top plan view of a swing traveling overhead crane employing an embodiment of the present invention, and Fig. 2 is an A-A diagram shown in Fig. 1.
It is a 2-part sectional view taken along the arrow. 1...Trolley, 2...Girder, 3.
...Traveling rail, 4...Structural member, 5.
...Roller, 6...Hanging tool, 7...
...Supporting member.

Claims (1)

[Scope of utility model registration request] An earthquake-resistant crane in which a truss structure is provided horizontally protruding outward from the guard of the crane moving on a circular rail, wheels are provided on the truss structure, and the wheels are mounted on the circular rail.