JP2011105473A - Base isolation outrigger and traveling crane using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation outrigger and a traveling crane using the same, which have not only a load support function but also a base isolation function, and efficiently reduces the transmission of acceleration from the ground when an earthquake occurs. <P>SOLUTION: A horizontal displacement absorbing means 15 damping and absorbing the relative displacement between an outrigger body 14a and an outrigger support frame 13 in a horizontal surface when an earthquake occurs is disposed between the outrigger body 14a and the outrigger support frame 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seismic isolation outrigger and a traveling crane using the seismic isolation outrigger.

  In general, a so-called tire mount type jib crane 1 as a traveling crane including a tire made of an elastic material such as rubber and filled with air or a solid solid type tire is shown in FIGS. 4 and 5, for example. As shown in the drawing, traveling wheels 3 made of tires (eight in the example in the width direction and two rows in the front-rear direction in the example in the figure) are attached to the rear portion of the base 2 and the mast 4 is mounted on the base 2. And an upper frame having a front column 7F and a rear column 7R. The upper frame has a front column 7F and a rear column 7R. 7, and a hoisting device 10 for hoisting and lowering a hoisting wire rope 9 for suspending a hoisting load hook 8 and a hoisting wire rope 11 for the jib 6. Raising and lowering to raise and lower It has installed formed by constituting a 12.

  The base 2 that supports the mast 4 is provided with an outrigger support frame 13 projecting radially from the left and right diagonally forward and left and right diagonally rearward with the mast 4 as the center. Attaching an outrigger body 14a such as a cylinder, and providing an outrigger receiving member 14c that can be grounded when the rod 14b is extended at the lower end of a rod 14b that can be expanded and contracted in the vertical direction of the outrigger body 14a. An outrigger 14 is configured as a load support member during operation. A tow tractor T is connected to the front portion of the base 2 so that the jib crane 1 can be transported by the tractor T.

  When the jib crane 1 performs the cargo handling work, the rod 14b is extended from the outrigger main body 14a of the outrigger 14, the outrigger receiving member 14c is grounded, and the traveling wheel 3 is lifted from the ground. The work load is supported by the outrigger 14 without acting on the traveling wheel 3.

  By the way, in recent years, major earthquakes have occurred in various parts of Japan, and in particular, during the Hyogoken-Nanbu Earthquake that occurred in January 1995, heavy damage to cranes occurred at factories and port facilities. Moreover, since there are concerns about the occurrence of the Tokai and Kanto earthquakes in the near future, research on improving the earthquake resistance of cranes has been conducted, and various damping structures and seismic isolation structures have been developed.

  In addition, as what shows the general technical level of the seismic isolation structure of a crane, there exists patent document 1, for example, in this patent document 1, the leg part which can drive | work on a running rail is seismically isolated. ing.

JP 2007-8719 A

  However, in the case of the jib crane 1 as shown in FIGS. 4 and 5, the outrigger 14 only has a function of supporting the weight of the jib crane 1 and the load at the time of cargo handling work, and itself has a seismic isolation function. There was nothing at all, and its development was desired.

  In view of such circumstances, the present invention has a seismic isolation outrigger that has not only a load support function but also a seismic isolation function and can efficiently reduce the transmission of acceleration from the ground when an earthquake occurs. It intends to provide the used traveling crane.

According to the present invention, an outrigger body extending in the vertical direction is attached to an outrigger support frame projecting from a base, and an outrigger receiving member that can be grounded at the lower end of a rod that is extendable in the vertical direction of the outrigger body when the rod is extended A seismic isolation outrigger,
The horizontal displacement absorbing means capable of absorbing and absorbing the relative displacement between the outrigger main body and the outrigger support frame in a horizontal plane at the time of occurrence of an earthquake is interposed between the outrigger main body and the outrigger support frame. This is related to seismic isolation outriggers.

  According to the above means, the following operation can be obtained.

  When configured as described above, the horizontal displacement absorbing means interposed between the outrigger body and the outrigger support frame absorbs and absorbs the relative displacement between the outrigger body and the outrigger support frame in the horizontal plane when an earthquake occurs. Acceleration transmitted from the ground to the outrigger support frame via the outrigger receiving member, the rod, and the outrigger main body can be reduced.

  In the seismic isolation outrigger, a horizontal acceleration acting on the outrigger body is supported by supporting a load during normal operation and restraining the occurrence of relative displacement between the outrigger body and the outrigger support frame by the horizontal displacement absorbing means. Trigger means for plastically deforming when the horizontal displacement absorbing means functions when the horizontal displacement absorbing means functions to absorb relative displacement attenuation between the outrigger main body and the outrigger support frame. During operation, the trigger means supports the load and restrains the occurrence of relative displacement between the outrigger body and the outrigger support frame by the horizontal displacement absorbing means, so that the base is supported in a more stable state. On the other hand, it acts on the outrigger body when a large vibration such as an earthquake occurs. When horizontal direction acceleration is equal to or greater than a set value, the triggering means is plastically deformed, the form of the relative displacement attenuation absorption functions between the outrigger body and outrigger supporting frame according to the horizontal displacement absorbing means.

The present invention also provides an outrigger body that extends in the vertical direction to an outrigger support frame that projects from the base, and that can be grounded when the rod is extended at the lower end of the rod that can be expanded and contracted in the vertical direction of the outrigger body. A seismic isolation outrigger provided with a receiving member,
A seismic isolation system characterized in that a horizontal displacement absorbing means capable of absorbing and absorbing relative displacement between the outrigger receiving member and the rod in a horizontal plane at the time of the occurrence of an earthquake is interposed between the outrigger receiving member and the rod. It depends on the outrigger.

  With this configuration, the horizontal displacement absorbing means interposed between the outrigger receiving member and the rod attenuates and absorbs the relative displacement between the outrigger receiving member and the rod in the horizontal plane at the time of the occurrence of the earthquake. Thus, the acceleration transmitted to the outrigger support frame via the outrigger receiving member of the outrigger, the rod, and the outrigger main body can be reduced.

  In the seismic isolation outrigger, a horizontal acceleration acting on the outrigger receiving member that supports a load during normal operation and restrains the occurrence of relative displacement between the outrigger receiving member and the rod by the horizontal displacement absorbing means. Triggering means for plastically deforming when the horizontal displacement absorbing means becomes greater than a set value and functioning the relative displacement attenuation absorption between the outrigger receiving member and the rod by the horizontal displacement absorbing means can be provided. Sometimes, the trigger means supports the load and restrains the relative displacement between the outrigger receiving member and the rod by the horizontal displacement absorbing means, which is effective for supporting the base in a more stable state. On the other hand, when a large acceleration such as an earthquake occurs and the horizontal acceleration acting on the outrigger receiving member exceeds a set value, Triggering means is plastically deformed, the form of the relative displacement attenuation absorption functions between the outrigger receiving member and the rod by the horizontal displacement absorbing means.

  On the other hand, the present invention relates to a traveling crane using a seismic isolation outrigger, characterized in that the seismic isolation outrigger is a load support member during cargo handling work.

  The seismic isolation outrigger of the present invention and the traveling crane using the seismic isolation outrigger have not only a load support function but also a seismic isolation function, and efficiently reduce the transmission of acceleration from the ground when an earthquake occurs. An excellent effect of obtaining can be obtained.

It is a schematic block diagram which shows the 1st Example of the seismic isolation outrigger of this invention. It is a perspective view which shows the steel bar damper applicable as a trigger means. It is a schematic block diagram which shows the 2nd Example of the seismic isolation outrigger of this invention. It is a whole outline side view showing an example (tire mount type jib crane) of a jib crane as a traveling crane. It is a VV arrow equivalent view of FIG.

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

  FIG. 1 shows a first embodiment of a seismic isolation outrigger according to the present invention. In the figure, the same reference numerals as those in FIGS. 4 and 5 denote the same components, and the basic configuration is shown in FIG. 5 and the conventional one shown in FIG. 5, but the feature of the first embodiment is that, as shown in FIG. 1, the horizontal plane at the time of the occurrence of an earthquake between the outrigger main body 14 a and the outrigger support frame 13. The horizontal displacement absorbing means 15 capable of absorbing and absorbing the relative displacement between the outrigger main body 14a and the outrigger support frame 13 is provided.

  In the case of the first embodiment, the horizontal displacement absorbing means 15 uses a laminated rubber support 16, and the laminated rubber support 16 as the horizontal displacement absorbing means 15 includes a number of rubber plates and steel plates as shown in FIG. Are laminated with an upper flange 16b and a lower flange 16c, and the lower flange 16c of the laminated rubber support 16 is formed on the upper surface of the outrigger body 14a. While fixing, the upper flange 16b of the said laminated rubber support 16 is fixed to the lower surface of the said outrigger support frame 13. As shown in FIG.

  In the case of the first embodiment, the load is supported during normal operation to restrain the occurrence of relative displacement between the outrigger body 14a and the outrigger support frame 13 by the horizontal displacement absorbing means 15, and the outrigger body 14a. Trigger means 17 is provided for causing the horizontal displacement absorbing means 15 to function to absorb relative displacement attenuation between the outrigger body 14a and the outrigger support frame 13 when the horizontal acceleration acting on the motor exceeds a set value. The trigger means 17 connects the connecting bracket 18 projecting upward from the lower flange 16c of the laminated rubber bearing 16 and the connecting bracket 19 projecting downward from the outrigger support frame 13, and acts horizontally on the outrigger body 14a. Shear that is broken by the shearing force when the direction acceleration exceeds the set value It is constituted by a pin 20. However, as the trigger means 17, instead of using the shear pin 20 as shown in FIG. 1, as shown by the phantom line in FIG. 1, a lead damper 16d is provided at the center of the laminated rubber support 16, and the upper flange 16b. 2 and the lower flange 16c are connected to each other, or as shown in FIG. 2, the upper and lower flanges 16b and 16c sandwiching the laminated rubber body 16a of the laminated rubber support 16 are connected to each other. It can also be constituted by a steel rod damper 21 made of a U-shaped steel material. As for the trigger means 17, only one of the shear pin 20, the lead damper 16d, and the steel rod damper 21 may be selected. Of course, a plurality of types may be used in combination. Is possible.

  Next, the operation of the first embodiment will be described.

  During normal operation, the shear pin 20 as the trigger means 17 supports the load, and restrains the occurrence of relative displacement between the outrigger body 14a and the outrigger support frame 13 by the laminated rubber support 16 as the horizontal displacement absorbing means 15. Therefore, the jib crane 1 is supported in a stable state by the outrigger 14 as a load support member, and the cargo handling operation is performed.

  On the other hand, when the horizontal acceleration acting on the jib crane 1 exceeds a set value when a large vibration such as an earthquake occurs, the shear pin 20 as the trigger means 17 is broken by a shearing force, and the horizontal displacement is absorbed. The relative displacement between the outrigger main body 14a and the outrigger support frame 13 in the horizontal plane at the time of the occurrence of the earthquake is attenuated and absorbed by the laminated rubber support 16 as the means 15, and the outrigger receiving member 14c, the rod 14b of the outrigger 14 and the outrigger from the ground. The acceleration transmitted to the outrigger support frame 13 of the jib crane 1 through the main body 14a can be reduced.

  Thus, the outrigger 14 has not only a load support function but also a seismic isolation function, and can effectively reduce the transmission of acceleration from the ground when an earthquake occurs.

  FIG. 3 is a second embodiment of the seismic isolation outrigger and the traveling crane using the seismic isolation outrigger according to the present invention. In the figure, the same reference numerals as those in FIG. The basic configuration is the same as that shown in FIG. 1, but the second embodiment is characterized in that an earthquake occurs between the outrigger receiving member 14c and the rod 14b as shown in FIG. The horizontal displacement absorbing means 15 that can absorb and absorb the relative displacement between the outrigger receiving member 14c and the rod 14b in the horizontal plane is interposed.

  In the case of the second embodiment, a lower flange 16c of the laminated rubber bearing 16 as the horizontal displacement absorbing means 15 is fixed to the upper surface of the outrigger receiving member 14c, and the laminated rubber bearing is attached to the lower surface of the rod 14b. The upper flange 16b of 16 is fixed.

  Further, in the case of the second embodiment, during normal operation, the load is supported and the occurrence of relative displacement between the outrigger receiving member 14c and the rod 14b by the horizontal displacement absorbing means 15 is restricted, and the outrigger main body 14a is restrained. Triggering means 17 that functions to absorb relative displacement attenuation between the outrigger receiving member 14c and the rod 14b by the horizontal displacement absorbing means 15 by plastic deformation when the acting horizontal acceleration becomes equal to or greater than a set value; The trigger means 17 connects the connecting bracket 18 projecting downward from the upper flange 16b of the laminated rubber bearing 16 and the connecting bracket 19 projecting upward from the outrigger receiving member 14c, and acts in the horizontal direction acting on the outrigger receiving member 14c. It is composed of a shear pin 20 that is broken by a shearing force when the acceleration exceeds a set value. That. However, as the trigger means 17, instead of using the shear pin 20 as shown in FIG. 3, as shown by the phantom line in FIG. 3, a lead damper 16d is provided at the center of the laminated rubber bearing 16, and the upper flange 16b. 2 and the lower flange 16c are connected to each other, or as shown in FIG. 2, the upper and lower flanges 16b and 16c sandwiching the laminated rubber body 16a of the laminated rubber support 16 are connected to each other. It can also be constituted by a steel rod damper 21 made of a U-shaped steel material. As for the trigger means 17, only one of the shear pin 20, the lead damper 16d, and the steel rod damper 21 may be selected. Of course, a plurality of types may be used in combination. Is possible.

  Next, the operation of the second embodiment will be described.

  During normal operation, the shear pin 20 as the trigger means 17 supports the load and restrains the occurrence of relative displacement between the outrigger receiving member 14c and the rod 14b by the laminated rubber support 16 as the horizontal displacement absorbing means 15. Therefore, the jib crane 1 is supported in a stable state by the outrigger 14 as a load support member, and the cargo handling operation is performed.

  On the other hand, when the horizontal acceleration acting on the jib crane 1 exceeds a set value when a large vibration such as an earthquake occurs, the shear pin 20 as the trigger means 17 is broken by a shearing force, and the horizontal displacement is absorbed. The relative displacement between the outrigger receiving member 14c and the rod 14b in the horizontal plane at the time of the earthquake is attenuated and absorbed by the laminated rubber support 16 as the means 15, and the outrigger receiving member 14c, the rod 14b of the outrigger 14 and the outrigger body from the ground. The acceleration transmitted to the outrigger support frame 13 of the jib crane 1 via 14a can be reduced.

  Thus, also in the second embodiment, as in the case of the first embodiment, the outrigger 14 has not only a load support function but also a seismic isolation function, and can effectively reduce the transmission of acceleration from the ground when an earthquake occurs. .

  The seismic isolation outrigger of the present invention and the traveling crane using the seismic isolation outrigger are not limited to the above-described embodiments, but are not limited to the traction-type jib crane by a tractor, Various changes can be made without departing from the gist of the present invention, such as being applicable to cranes and applicable to any equipment provided with an outrigger as a load support member. Of course you get.

  As the horizontal displacement absorbing means, instead of the laminated rubber bearing, a lower guide rail is attached to the surface of the lower flange plate, and the lower guide block is slidable with respect to the lower guide rail via a linear ball bearing. At the same time, an upper guide rail extending in a direction perpendicular to the lower guide rail is attached to the surface of the upper flange plate, and the upper guide block is slidably fitted to the upper guide rail via a linear ball bearing. The lower guide block and the back surface of the upper guide block are integrally fixed to each other with a cushioning material such as a rubber shim, or the surface of the lower flange plate made of a steel plate is coated with resin. A stainless steel plate with layers is integrated to form a support material, and from a steel plate A sliding material is formed by integrating a steel plate having a fluororesin layer formed on the surface of the upper flange plate via a vibration absorbing material such as a natural rubber sheet, and the sliding material is formed on the support material. A sliding bearing formed by placing the coating layer and the fluororesin layer in contact with each other, or a structure in which a plurality of disc springs are stacked between the upper and lower flange plates can be used.

  Furthermore, as the trigger means, instead of the shear pin, the lead damper, the steel rod damper, etc., the two plates are brought into surface contact, and during normal operation, a load is applied by the mutual friction force between the two plates. A load caused by the frictional force when the horizontal acceleration acting on the outrigger body becomes greater than or equal to a set value while restraining relative displacement between the outrigger body and the outrigger support frame by the horizontal direction displacement absorbing means. Is supported so that the relative displacement attenuation absorption between the outrigger main body and the outrigger support frame by the horizontal displacement absorbing means is functioned, or two plates are brought into surface contact, and two plates are brought into contact during normal operation. The load is supported by the mutual frictional force between the plates, and the outrigger receiving member and the lock by the horizontal displacement absorbing means are supported. When the horizontal acceleration acting on the outrigger body exceeds a set value, the load support by the frictional force is released and the outrigger receiving member by the horizontal displacement absorbing means is restrained. It is also possible to use one that functions to absorb the relative displacement attenuation between the rod and the rod.

1 Jib crane (traveling crane)
2 base 3 traveling wheel 4 mast 5 swivel 6 jib 7 upper frame 13 outrigger support frame 14 outrigger 14a outrigger main body 14b rod 14c outrigger receiving member 15 horizontal direction displacement absorbing means 16 laminated rubber bearing 16a laminated rubber main body 16b upper flange 16c bottom Flange 16d Lead damper 17 Trigger means 18 Connection bracket 19 Connection bracket 20 Shear pin 21 Steel rod damper

Claims (5)

An outrigger body extending in the vertical direction is attached to the outrigger support frame extending from the base, and an outrigger receiving member that can be grounded when the rod is extended is provided at the lower end of the rod that is extendable in the vertical direction of the outrigger body. A seismic isolation outrigger,
The horizontal displacement absorbing means capable of absorbing and absorbing the relative displacement between the outrigger main body and the outrigger support frame in a horizontal plane at the time of occurrence of an earthquake is interposed between the outrigger main body and the outrigger support frame. Seismic isolation outrigger.   When a load is supported during normal operation and the horizontal displacement absorbing means restrains the relative displacement between the outrigger body and the outrigger support frame, and the horizontal acceleration acting on the outrigger body exceeds a set value. 2. The seismic isolation outrigger according to claim 1, further comprising trigger means for plastically deforming to function to absorb relative displacement attenuation between the outrigger body and the outrigger support frame by the horizontal displacement absorbing means. An outrigger body extending in the vertical direction is attached to the outrigger support frame extending from the base, and an outrigger receiving member that can be grounded when the rod is extended is provided at the lower end of the rod that is extendable in the vertical direction of the outrigger body. A seismic isolation outrigger,
A seismic isolation system characterized in that a horizontal displacement absorbing means capable of absorbing and absorbing relative displacement between the outrigger receiving member and the rod in a horizontal plane at the time of the occurrence of an earthquake is interposed between the outrigger receiving member and the rod. Outrigger.   During normal operation, when the load is supported and the horizontal displacement absorbing means restrains the relative displacement between the outrigger receiving member and the rod, and the horizontal acceleration acting on the outrigger receiving member exceeds a set value. 4. The seismic isolation outrigger according to claim 3, further comprising trigger means for plastically deforming to function to absorb relative displacement attenuation between the outrigger receiving member and the rod by the horizontal displacement absorbing means.   A traveling crane using a seismic isolation outrigger, wherein the seismic isolation outrigger according to any one of claims 1 to 4 is used as a load support member during a cargo handling operation.

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