JP4536895B2 - Seismic isolation structure for traveling crane - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a traveling crane used in a harbor portion or the like, which can particularly prevent damage due to a large or small earthquake with a simple configuration and does not require time for recovery after an earthquake occurs. This is related to the seismic isolation structure.
[0002]
[Prior art]
In general, a large traveling crane is used in a harbor portion or the like to unload a cargo such as a container.
[0003]
The traveling crane includes a container crane 1 as shown in FIG. 8 and an unloader (not shown). However, since the construction of the traveling unit 2 is substantially the same, the case of the container crane in FIG. 8 will be described below as an example. .
[0004]
The quay 4 facing the harbor 3 is provided with a sea-side rail 5 and a land-side rail 6, and the traveling part 2 of the traveling crane 1 can roll along the sea-side rail 5 and the land-side rail 6. A sea-side support leg 8 and a land-side support leg 9 each having a special wheel 7 are integrally fixed to a horizontal member 10. Although not shown, only the land-side support leg 9 is a rigid leg integrated with the horizontal member 10, and the sea-side support leg 8 is oscillated by a pivot pin parallel to the rails 5 and 6 with respect to the horizontal member 10. A swinging leg structure that is pivotally supported is also adopted.
[0005]
In the traveling crane 1 shown in FIG. 8, when an earthquake occurs, the excitation force A perpendicular to the traveling direction of the traveling crane 1 acts on the traveling crane 1 as a dangerous external force. This excitation force A is transmitted to and supported by the rails 5 and 6 by the sea-side support legs 8 and the land-side support legs 9, but when a large earthquake occurs, the support legs 8 and 9 may be bent and damaged. In this case, as shown in FIG. 9, the traveling crane 1 falls down and falls into the sea, so that it cannot be restored, or the restoration is costly. There is a risk of damage.
[0006]
In order to prevent such a problem, it is necessary to significantly increase the rigidity of the support legs 8 and 9 and the traveling unit 2 as a whole. In this case, the weight of the traveling crane 1 is increased and the production cost is increased. There is an inviting problem.
[0007]
Also, in recent years, as a means to solve such problems, a vibration damping mechanism made of elastic material or low friction material has been installed on the support legs and other components of the running section to absorb and attenuate the excitation force caused by earthquakes. There is a proposed method.
[0008]
In addition to this, a shear pin that is broken when an excitation force of a predetermined level or more is applied due to an earthquake is provided on the support leg of the traveling unit, or is always fastened but has a predetermined level of excitation. There has been proposed a method in which a traveling unit is provided with a fastening machine that is released when a force is applied. Further, in the method in which the shear pin is broken or the restraint is released by the action of the excitation force exceeding the predetermined value in this way, the components released from fastening are not separated from each other by a predetermined distance or more. In combination with a stopper mechanism.
[0009]
[Problems to be solved by the invention]
However, the above method also has the following problems.
[0010]
That is, in the method of installing a vibration damping mechanism using an elastic material or a low friction material, the upper part of the crane body is shaken by the elastic material even during crane work, which makes the rider feel uncomfortable and uncomfortable. Problem arises. Furthermore, it is very difficult for the vibration damping mechanism using an elastic material to suitably set the functional conditions for reliably absorbing the excitation force caused by the earthquake, and this may amplify the swing in some cases. There is also sex. Furthermore, when the structural members of the elastic material installation portion stop while being displaced from each other in the horizontal direction due to the occurrence of an earthquake, it is necessary to return to the original position in order to work again. Therefore, there is a problem that the apparatus is complicated and expensive.
[0011]
In the case of a method using a shear pin or a fastening machine, the above-mentioned problem of shaking during crane work can be prevented, but the shear pin is actively broken or fastened by an excessive excitation force due to an earthquake. Since the fastening by the machine is released, the released components are displaced from each other in the horizontal direction. At this time, if the fastening is completely released, the traveling crane loses its support and falls down, so it is necessary to provide a stopper function for restraining the constituent members from shifting in the horizontal direction beyond a predetermined distance. There is. Further, when the structural member is displaced in the horizontal direction and stopped, it is necessary to provide a position adjusting device such as a jack for returning the structural member to the original relative position. Thus, in the case of a method using a shear pin or a fastening machine, a stopper function and a position adjusting device are required, so that the device is complicated and expensive.
[0012]
On the other hand, when the shear pin breaks or the fastening machine is released, adjustment work to return the displacement of the component members to the original position, removal of the broken shear pin and installation of a new shear pin, or re-fastening of the fastening machine Therefore, there is a problem that it takes time for the recovery work. In the event of damage to the land due to a major earthquake, it may be possible to transport a large amount of goods by sea traffic and unload it from the port. In such a case, it will take time to restore the traveling crane installed in the port. This is an important issue.
[0013]
The present invention has been made in view of these conventional problems, and since the entire traveling crane exhibits a rigid structure and does not shake during normal work, the present invention can perform a good operation, and a large-scale earthquake can occur. It is related to the seismic isolation structure of a traveling crane that can absorb and attenuate the horizontal excitation force by bending the support leg when it occurs, and that normal crane work can be resumed as soon as the earthquake stops. is there.
[0014]
[Means for Solving the Problems]
The present invention provides a support leg of a traveling part of a traveling crane provided with an upper and lower flange part that can be divided into upper and lower parts and connected to each other, and a right and left direction perpendicular to the crane traveling direction is provided on the opposing surface of the upper and lower flange part. The right and left sides of the flange portion are formed with a contact surface that has a required contact width and transmits a load in the vertical direction, and a gap is formed outside both width ends of the contact surface. This invention relates to a seismic isolation structure for a traveling crane, characterized in that the position of the part is connected up and down by a connecting tool via an elastic material.
[0015]
In the above means, the elastic material may be a disc spring, the elastic material may be a compression spring, the elastic material may be an elastic rubber, and the both end portions of the contact surface A fulcrum pin along both width ends may be provided.
[0016]
According to the present invention, during normal crane operation of the traveling crane, the contact surfaces of the upper and lower flange portions are in close contact with each other by the repulsive force of the elastic material, and the vertical load of the traveling crane is reliably transmitted to the lower portion. Therefore, the support leg of the traveling unit has a rigid structure and does not shake, thereby improving the ride comfort of the driving operator and performing good driving work.
[0017]
When a large earthquake occurs and a large excitation force is applied to the traveling part of the traveling crane, the support legs are bent at the seismic isolation structure, and the upper and lower flanges are pre-compressed or tensioned by the elastic material. Since the support leg is inclined to the left and right against the force, the support leg can be bent flexibly. Therefore, the excitation force can be effectively absorbed and attenuated effectively. Thereby, the response vibration with respect to the earthquake of a traveling crane can be reduced, and generation | occurrence | production of problems, such as breakage and collapse of a traveling crane, can be prevented.
[0018]
In addition, the support legs are bent at the seismic isolation structure by the excitation force, and the upper and lower members do not shift in the horizontal direction. If the earthquake stops, normal crane work resumes. it can.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a schematic front view of an embodiment of the present invention applied to the traveling unit 2 of the traveling crane 1 of FIG. 8, FIG. 2 is a front view showing a detailed example of the seismic isolation structure in FIG. 1, and FIG. FIG. 8 is a view taken in the direction of arrows III-III, and the same components as those in FIG.
[0021]
In FIG. 1, seismic isolation structures 11 are provided at the upper positions of the sea-side support legs 8 and the land-side support legs 9 of the traveling unit 2 of the traveling crane 1. This seismic isolation structure 11 divides each of the sea-side support leg 8 and the land-side support leg 9 vertically at an upper position close to the horizontal member 10, and the divided upper members 8a, 9a and lower members 8b, 9b. The upper and lower flange portions 12 and 13 that can be connected to each other are provided at the opposite end portions.
[0022]
As shown in FIG. 2 and FIG. 3, the horizontal surfaces of the opposing surfaces of the upper and lower flange portions 12 and 13 have a required contact width L in the left-right direction perpendicular to the crane traveling direction (the direction perpendicular to the paper surface). A surface 14 is formed, and a load in the vertical direction (up and down direction of the paper surface) can be transmitted by the contact surface 14. Further, gaps 15 and 16 are formed on the outer sides of both width end portions 14 a and 14 b of the contact surface 14.
[0023]
And the right-and-left side part position in which the clearance gaps 15 and 16 in the said flange parts 12 and 13 were formed is connected up and down by the connection tool 18 via the elastic material 17. FIG. The elastic member 17 in FIG. 2 shows a case where a plurality of disc springs 17 </ b> A are fastened by a connector 18.
[0024]
The resilience strength of the elastic member 17 and the tightening strength by the connector 18 are determined so as to obtain a predetermined precompression force depending on the magnitude of the assumed earthquake. Since the supporting legs 8 and 9 of the large traveling crane 1 generally have a cross-sectional box shape as shown in FIGS. 2 and 3, an elastic material is sandwiched between the left and right side plates 19 of the supporting legs 8 and 9. It is preferable to reduce the size of the apparatus by arranging 17 in two rows.
[0025]
The contact surfaces 14 of the flange portions 12 and 13 are formed so as to be located in the center between the left and right side plates 19 and 19, and are formed outside both width end portions 14 a and 14 b of the contact surface 14. The gaps 15 and 16 are formed by providing an inclined surface 20 on the upper surface of the lower flange portion 13 in FIGS. The inclination angle α of the inclined surface 20 is determined from the magnitude of the assumed earthquake and the length of the lower members 8b, 9b of the support legs 8, 9. The gaps 15 and 16 may be formed by providing an inclined surface on the lower surface of the upper flange portion 12, or inclined on both the lower surface of the upper flange portion 12 and the upper surface of the lower flange portion 13. You may form by providing a surface. Further, the gaps 15 and 16 may be parallel gaps formed between the upper and lower flange portions 12 and 13 in addition to the inclined surfaces.
[0026]
At the positions of the width end portions 14a and 14b of the contact surface 14, fulcrum pins 21 and 22 extending in the front-rear direction along the width end portions 14a and 14b are provided. The fulcrum pins 21 and 22 serve as fulcrums when the upper and lower flange portions 12 and 13 are inclined.
[0027]
2 and 3, reference numeral 23 denotes a stopper for preventing the horizontal displacement of the upper and lower flange portions 12 and 13 and preventing the upper members 8a and 9a and the lower members 8b and 9b from being greatly bent and inclined. Is a stopper for preventing the positional deviation of the upper and lower flange portions 12 and 13 in the front-rear direction.
[0028]
The operation of the above embodiment will be described below.
[0029]
During normal crane work by the traveling crane 1, the abutment surfaces 14 of the upper and lower flange portions 12 and 13 of the seismic isolation structure 11 are in close contact with each other by the repulsive force of the elastic material 17, and the vertical direction of the traveling crane 1. The load is reliably transmitted to the lower part through the contact surface 14, and the support legs 8 and 9 of the traveling unit 2 have a rigid structure and do not shake, so that the traveling crane 1 can be operated satisfactorily.
[0030]
Further, when a large earthquake occurs and a large excitation force A in a direction perpendicular to the traveling direction of the traveling crane 1 acts on the traveling unit 2 of the traveling crane 1, for example, as shown in FIG. The upper members 8a and 9a and the lower members 8b and 9b are bent, and the upper and lower flange portions 12 and 13 are inclined about the right fulcrum pin 22 against the precompression force of the left elastic member 17. 2 returns to the state shown in FIG. Further, when the upper members 8a, 9a and the lower members 8b, 9b of the support legs 8, 9 are bent to the opposite side, the upper and lower flange portions 12, 13 resist the precompression force of the right elastic member 17. As a result, the left fulcrum pin 21 is inclined toward the center. Then, the state shown in FIG.
[0031]
Thus, when an excitation force A of a predetermined magnitude or larger is applied to the traveling crane 1, the support legs 8 and 9 are flexibly bent against the precompression force of the elastic material 17, and accordingly The excitation force A can be effectively and reliably absorbed and attenuated. Therefore, the response vibration with respect to the earthquake of the traveling crane 1 can be reduced, and the occurrence of problems such as damage or collapse of the traveling crane 1 can be prevented.
[0032]
Further, as described above, the upper members 8a and 9a and the lower members 8b and 9b are displaced in the horizontal direction only by bending the support legs 8 and 9 at the portion of the seismic isolation structure 11 due to the excitation force A. Therefore, if the earthquake stops, normal crane work can be resumed.
[0033]
5 and 6 show the case where the elastic member 17 is a compression spring 17B, and the compression spring 17B is attached to the flange portions 12 and 13 by a connecting tool 18. FIG. Even in this structure, the seismic isolation can be performed in the same manner as in FIGS. 2 to 4 by the repulsive force of the precompressed compression spring 17B. Unlike the case of providing the compression spring 17B of FIGS. 5 and 6, a tension spring is provided between the upper flange portion 12 and the lower members 8b and 9b, or the lower flange portion 13 and the upper member 8a. , 9a, a combination of these, and a combination of these springs to provide a pre-tensioning force can be used to provide seismic isolation as described above.
[0034]
FIG. 7 shows a case where the elastic member 17 is an elastic rubber 17C, and the elastic rubber 17C is attached to the flange portions 12 and 13 by a connecting tool 18. Even in this structure, the seismic isolation can be performed in the same manner as in FIGS. 2 to 4 by the repulsive force of the precompressed elastic rubber 17C.
[0035]
Note that the present invention is not limited only to the above-described embodiment. In the case of a traveling crane provided with a combination of a rigid leg and a rocking leg structure, the configuration of the above-described embodiment may be applied only to the rigid leg. Of course, various modifications can be made without departing from the scope of the present invention.
[0036]
【The invention's effect】
According to the present invention, during normal crane operation of the traveling crane, the contact surfaces of the upper and lower flange portions are in close contact with each other by the repulsive force of the elastic material, and the vertical load of the traveling crane is reliably transmitted to the lower portion. Therefore, the support leg of the traveling unit has a rigid structure and does not shake, thereby improving the ride comfort of the driving worker and providing an effect of performing a good driving operation.
[0037]
When a large earthquake occurs and a large excitation force acts on the traveling part of the traveling crane, the support legs bend at the seismic isolation structure and the upper and lower flanges resist the repulsive force of the elastic material. Since the support leg is tilted to the left and right, the support leg can be bent flexibly, so that the excitation force can be effectively absorbed and attenuated. Thereby, the response vibration with respect to the earthquake of a traveling crane can be reduced, and there exists an effect which can prevent generation | occurrence | production of problems, such as destruction and collapse of a traveling crane.
[0038]
In addition, the support legs are bent at the seismic isolation structure by the excitation force, and the upper and lower members do not shift in the horizontal direction. If the earthquake stops, normal crane work resumes. There is an effect that can be done.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a traveling unit of a traveling crane showing an embodiment of the present invention.
2 is a front view showing a detailed example of the seismic isolation structure in FIG. 1. FIG.
3 is a view taken in the direction of arrows III-III in FIG. 2;
4 is a front view showing an operating state of the configuration of FIG. 2. FIG.
FIG. 5 is a front view showing another example of an elastic material according to the present invention.
6 is a view taken in the direction of arrows VI-VI in FIG.
FIG. 7 is a front view showing still another example of the elastic material in the present invention.
FIG. 8 is a schematic configuration diagram showing an example of a conventional traveling crane.
FIG. 9 is a schematic view showing a state in which a traveling crane of a conventional example collapses.
[Explanation of symbols]
1 Traveling crane (container crane)
2 running part 8 sea side support leg (support leg)
9 Land-side support legs (support legs)
DESCRIPTION OF SYMBOLS 11 Seismic isolation structure 12 Flange part 13 Flange part 14 Contact surface 14a, 14b Width end parts 15 and 16 Gap 17 Elastic material 17A Disc spring 17B Compression spring 17C Elastic rubber 18 Connecting tool 21 Support point pin 22 Support point pin L Contact width

Claims (5)

The support legs of the traveling part of the traveling crane are provided with upper and lower flange parts that can be divided into upper and lower parts so that they can be connected to each other. Forming a contact surface having a width and transmitting a load in the vertical direction, forming a gap on the outer side of both width ends of the contact surface, A seismic isolation structure for a traveling crane, characterized in that it is connected up and down by a connecting tool via an elastic material. The seismic isolation structure for a traveling crane according to claim 1, wherein the elastic material is a disc spring. The seismic isolation structure for a traveling crane according to claim 1, wherein the elastic material is a compression spring. The seismic isolation structure for a traveling crane according to claim 1, wherein the elastic material is elastic rubber. The seismic isolation structure for a traveling crane according to any one of claims 1 to 4, wherein both width end portions of the contact surface are provided with fulcrum pins along the both width end portions.

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