JPH11255477A - Traveling crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a traveling crane capable of preventing a tumble in case of derailment generated by an earthquake or the like. SOLUTION: Sea-side/land-side support legs 9, 10 respectively provided with a wheel 8 capable of rolling along sea-side/land-side rails 6, 7 are provided in a running part 3 of a traveling crane 1, generally the land-side support leg 10 is formed in a pair of leg parts structure relating to a running part main unit 11, and oppositely the sea-side support leg 9 is formed in a structure of swivel leg pivotally supported capable of swiveling by a pivotal support pin 12 in parallel to each rail 6, 7 relating to the running part main unit 11. A damper means 13 constituted by low yielding point steel or the like is provided in beams 11a, 11b of the running part main unit 11, and vibration energy in a horizontal direction by an earthquake is absorbed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling crane capable of preventing the traveling crane from suffering a large-scale earthquake damage such as buckling of a traveling portion main body due to an earthquake or the like and falling over due to derailing. It is.

[0002]

2. Description of the Related Art Generally, a large traveling crane is used in a port or the like to load and unload cargo such as containers.

FIGS. 3 and 4 are schematic structural views showing a general structure of a traveling crane (container crane). FIG.
FIG. 4 is a view for explaining a state in which the traveling crane 1 comes off and collapses when an earthquake occurs, and thus the wheels 8 of the support legs 9 and 10 are disengaged from the rails 6 and 7. However, the conventional structure will be described below as a normal state.

[0004] The traveling section 3 of the traveling crane 1 is as follows. That is, on the quay 5 facing the port 4,
A seaside rail 6 and a landside rail 7 are provided, and the traveling part 3 of the traveling crane 1 has a seaside support provided with wheels 8 that can roll along the seaside rail 6 and the landside rail 7, respectively. It has a structure in which the leg 9 and the land-side support leg 10 are attached to the traveling unit main body 11.
In contrast, the sea-side support leg 9 is pivotally supported on the traveling section main body 11 by a pivot pin 12 parallel to each of the rails 6 and 7. It has a swing leg structure.

According to the above-mentioned structure, the vertical load and the horizontal load of the traveling crane 1 are supported by the land-side supporting legs 10 having the rigid leg structure, and only the vertical load of the traveling crane 1 is supported by the sea-side supporting legs 9 having the swinging leg structure. By having them support you,
When an earthquake occurs or a strong wind blows, the sea-side support leg 9 swings around the pivot pin 12, and the horizontal force due to the earthquake or wind is weakened on the sea side of the quay 5 where the foundation is weak and the strength is disadvantageous. I do not want to go to. In addition, by making the sea-side support leg 9 have a swinging leg structure, it is possible to absorb an error in the interval between the sea-side rail 6 and the land-side rail 7.

[0006]

However, the conventional traveling crane 1 as described above has the following problems.

That is, the traveling crane 1 which is a heavy object
Is the traveling unit body 11
May buckle, and when a large-scale earthquake occurs such that the legs are lifted, the traveling crane 1 projecting greatly from the quay 5 to the sea side loses its balance and leans toward the sea side. As a result, as shown in FIG.
Wheels 8 are lifted off the land side rails 7 and
When the wheel 8 of the land-side support leg 10 slides sideways and shifts in the direction away from the land-side rail 7, the distance between the lower end of the land-side support leg 10 and the sea-side support leg 9 As a result, as shown in FIG. 4, the sea-side supporting leg 9 of the swinging leg structure is tilted obliquely around the pivot pin 12, the traveling crane 1 falls down and falls into the sea, and recovery is not possible. Is it possible?
Alternatively, there is a possibility that the recovery may be costly.

In view of such circumstances, the present invention prevents a horizontal force from being applied to the sea side of a quay, which has a weak foundation and is disadvantageous in strength, while preventing a large horizontal force from acting on a traveling crane due to an earthquake or the like. It is another object of the present invention to provide a traveling crane capable of preventing a large-scale earthquake damage of the traveling crane, such as buckling of the traveling section body, derailing, or falling of the traveling crane.

[0009]

In order to achieve the above object, the present invention provides a seaside support leg movable along a seaside rail, and a landside support leg movable along a landside rail. In the traveling crane in which is mounted on the traveling section main body, a damper means for absorbing horizontal vibration energy is provided at an arbitrary position of a beam constituting the traveling section main body.

Here, the damper means is provided on a beam extending in a horizontal direction including an oblique horizontal direction in order to efficiently absorb horizontal vibration energy due to an earthquake or the like.

The damper means is specifically made of, for example, a low-yield-point steel connecting between steel frames constituting beams.

In the present invention, as a damper means, for example, a low yield point steel (extremely mild steel) for connecting a steel frame constituting a beam to a steel frame is provided on at least a beam extending in a lateral direction among the beams constituting a traveling portion main body. Therefore, if the traveling crane receives a large amount of vibration energy in the horizontal direction due to the occurrence of an earthquake, this low-yield point steel reaches the yield point earlier than the steel frame, causing plastic deformation or fracture, thereby causing the vibration energy Absorb.

Accordingly, the natural period of the vibration of the entire traveling crane is increased, the predominant period of the earthquake is separated from the natural period of the structure, and the response is reduced. As a result, the traveling unit body can be prevented from buckling, and the wheels of the sea-side support legs and the land-side support legs can be prevented from rising off the rails and falling off, thereby preventing the traveling crane from falling over and collapsing. can do.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a traveling crane according to an embodiment of the present invention.

Similar to the traveling crane 1 shown in FIGS. 3 and 4, the traveling section 3 of the traveling crane 1 is as follows. That is, a seaside rail 6 and a landside rail 7 are provided on a quay 5 facing the harbor 4, and the traveling portion 3 of the traveling crane 1 rolls along the seaside rail 6 and the landside rail 7. It has a structure in which a sea-side support leg 9 provided with a movable wheel 8 and a land-side support leg 10 are attached to a traveling unit main body 11. And the sea-side support legs 9 are
It has a swinging leg structure that is pivotally supported on the traveling unit main body 11 by pivoting pins 12 parallel to the rails 6 and 7.

In the traveling crane 1 according to the embodiment of the present invention, dampers 13 are provided on horizontal beams 11a extending in the horizontal direction which constitute the traveling portion main body 11.
When the traveling crane 1 receives large vibration energy in the horizontal direction due to an earthquake or the like, the vibration energy is absorbed by the damper unit 13.

FIG. 2 is a structural view showing an example of the damper means 13, showing a state in which the damper means 13 is attached to the horizontal beam 11a. Although the beam 11a is made of steel, the damper means 13 is formed by cutting the middle of the steel and connecting the cut steel with low yield point steel (extremely mild steel) 13a.

When the traveling crane 1 swings and deforms by receiving large vibration energy in the horizontal direction when an earthquake occurs, the low yield point steel 13a has a low yield point, so the beams 11a and 11b ( Or a vertical beam) before reaching the yield point and causing plastic deformation or fracture, thereby absorbing vibration energy. As a result, it is possible to prevent the running part main body 11 from buckling, and to prevent the wheels 8 of the sea-side support legs 9 and the land-side support legs 10 from floating off the rails 6 and 7 and to get out of the vehicle, and extend. Prevents the traveling crane 1 from overturning or collapsing.

In order to absorb the vibration energy in the horizontal direction due to the earthquake by the low yield point steel 13a, it is necessary to provide at least the damper means 13 made of the low yield point steel 13a on the horizontal beam 11a extending in the lateral direction. As shown in FIG. 1, if the damper means 13 is provided also on the beam 11b extending obliquely in the horizontal direction, for example, the reliability is further improved in terms of safety measures.

Further, the damper means 13 is not limited to the low yield point steel 13a, and various other known means can be used.

As described above, in the embodiment of the present invention, when the low yield point steel 13a is plastically deformed or fractured when an earthquake occurs, horizontal vibration energy is absorbed, and the rigidity of the traveling section main body 11 is reduced ( (Flexible structure), and the natural period of vibration of the entire structure becomes large. Thereby, the predominant period of the earthquake is separated from the natural period of the structure, and the response is reduced. By these actions, the load applied to the sea-side support leg 9 and the land-side support leg 10 is reduced, and the phenomenon that the wheel 8 of the sea-side support leg 9 and the land-side support leg 10 is lifted is prevented, thereby preventing the wheel from coming off. Thus, the traveling crane 1 can be prevented from being seriously damaged due to overturn or collapse.

[0023]

As described above, according to the present invention, the damper means composed of, for example, a low yield point steel is incorporated into an arbitrary portion of the beam of the traveling section body which receives horizontal vibration energy due to an earthquake. Therefore, when the traveling crane receives large vibration energy in the horizontal direction and tries to deform by swinging when the earthquake occurs, the vibration energy is absorbed by the plastic deformation or breakage of the damper means. It is possible to prevent the wheels of the legs and the land-side support legs from being lifted off the rails and coming off the wheels, and thus to prevent the traveling crane from falling down or collapsing.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a traveling crane according to an embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating an example of a damper unit.

FIG. 3 is a schematic diagram showing a state in which a traveling crane has lost a wheel due to an earthquake.

FIG. 4 is a schematic view showing a state in which a traveling crane collapses due to an earthquake.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling crane 3 Traveling part 4 Harbor 5 Wharf 6 Seaside rail 7 Landside rail 8 Wheel 9 Seaside supporting leg 10 Landside supporting leg 11 Running part main body 11a, 11b Beam 12 Pivot pin 13 Damper means 13a Low yield point steel

Claims (3)

[Claims] A traveling crane in which a sea-side support leg movable along a sea-side rail and a land-side support leg movable along a land-side rail are attached to the traveling unit body. A traveling crane characterized in that damping means for absorbing vibration energy due to an earthquake or the like is provided at an arbitrary position of a beam to be moved. 2. The traveling crane according to claim 1, wherein the damper means is provided on a beam extending in a lateral direction. 3. The traveling crane according to claim 1, wherein the damper means is made of low-yield-point steel for connecting between steel frames constituting the beam.