WO2013051702A1

WO2013051702A1 - Seismic isolation support device for traveling crane

Info

Publication number: WO2013051702A1
Application number: PCT/JP2012/075988
Authority: WO
Inventors: 浩祐岩本; 佐藤　祐二; 宏次谷田; 齊藤　修; 英聡酒井
Original assignee: Ｉｈｉ運搬機械株式会社
Priority date: 2011-10-06
Filing date: 2012-10-05
Publication date: 2013-04-11
Also published as: JP2013082515A; JP5809915B2; TW201326019A; TWI490158B

Abstract

This seismic isolation support device (100) for a traveling crane is provided with a seismic isolation structure (200) having: a top and bottom flange part (8, 9) which are formed by being separated into a top and bottom portion and which are capable of being connected to one another; and a connection tool (14) for connecting the top and bottom flange parts (8, 9) via an elastic material (13). Contact surfaces (10) which come into contact with one another and which have a contact width in the width direction are formed on the facing surfaces of the top and bottom flange parts (8, 9). Gaps (11, 12) for allowing the flange parts (8, 9) to tilt outward relative to both ends of the contact surfaces (10) in the width direction are formed between the top and bottom flange parts (8, 9). Moreover, elasto-plastic braces (300) for connecting the top and bottom flange parts (8, 9) in the top and bottom are provided.

Description

Seismic isolation support device for traveling crane

The present invention relates to a seismic isolation support device for a traveling crane.
This application claims priority based on Japanese Patent Application No. 2011-2222048 filed in Japan on October 6, 2011, the contents of which are incorporated herein by reference.

A container crane, which is an example of a traveling crane and is used in a harbor or the like, has a crane body in which support legs are formed in a gate shape. The crane body travels along the rail on the quay by means of wheels (traveling devices) provided at the lower support legs at the four corners.

When an earthquake occurs in a harbor or the like where such a traveling crane is used, an excitation force in a direction orthogonal to the traveling direction of the traveling crane acts on the crane body as an external force. On the other hand, because the crane body has flexibility, the crane body is flexible even if a small-scale or medium-scale earthquake occurs and an excitation force acts in a direction perpendicular to the traveling direction. It can be deformed to absorb the excitation force, and is less likely to cause problems with the traveling crane.

However, when a large earthquake occurs, a large external force may act on the support leg in a direction perpendicular to the traveling direction of the traveling crane.

The seismic isolation structure for coping with this problem is disclosed in Patent Documents 1 and 2 below. In the seismic isolation structures of Patent Documents 1 and 2, the support legs of the traveling crane are provided with upper and lower flange portions that are divided into upper and lower portions and can be connected to each other, on the opposing surfaces of these upper and lower flange portions, A contact surface having a predetermined contact width in the left-right direction perpendicular to the crane traveling direction and transmitting a load in the vertical direction is formed. Further, a gap is formed outside the both end portions of the contact surface in the left-right direction, and both end portions of the upper and lower flange portions where the gap is formed are connected vertically by a connecting tool via an elastic material. .

Japanese Patent No. 4536895 Japanese Unexamined Patent Publication No. 2002-302376

In the seismic isolation structures of Patent Documents 1 and 2, a trigger (braking device) is formed by the contact surface, the gap, and the elastic material. In small and medium-scale earthquakes, the contact surfaces can be kept in contact with each other, so that the support legs are held in a fixed state. In addition, when a large-scale earthquake occurs, the upper and lower support legs are bent against the pre-compression force and pre-tension force of the elastic material, thereby preventing the support legs from being damaged. Further, the flanges opened by bending of the support legs (separated from each other at one end) are always urged in the closing direction by the restoring force of the elastic material, so that they are bent when the earthquake stops. The supported legs are restored to the normal fixed state.

However, the seismic isolation structures described in Patent Documents 1 and 2 do not have a damping function. Therefore, when the flange portion is opened by tilting due to a large-scale earthquake as described above, the contact surfaces come into contact with each other with an impact force when the flange portion is closed and the contact surface is in contact. For this reason, a large response acceleration may occur in the crane body.

In order to respond to a large-scale earthquake in a traveling crane, it is effective to increase the base isolation performance by extending the base isolation cycle. One means for prolonging the base isolation cycle in the base isolation structures of Patent Documents 1 and 2 is to reduce the spring stiffness (spring constant) of the elastic material provided in the base isolation structure. However, in order to keep the trigger function constant even when the spring stiffness of the elastic material is lowered, it is necessary to apply a very large initial compression force while using an elastic material with low spring stiffness. Can be very large.

Also, in order to prolong the seismic isolation cycle, it may be possible to add a damping function by installing a hydraulic damper or the like in the seismic isolation structures of Patent Documents 1 and 2. However, since the structure of a hydraulic damper or the like is complicated and expensive, if the hydraulic damper or the like is installed only for adding a damping function, cost effectiveness may be reduced.

The present invention has been made in view of the above-described conventional problems. The support leg can be bent when a large-scale earthquake occurs, the seismic isolation cycle can be extended with a simple configuration, and the response acceleration of the crane body can be reduced. To provide a seismic isolation support device for a traveling crane.

According to the first aspect of the present invention, a seismic isolation support device for a traveling crane is divided into upper and lower support legs of a crane main body and can be connected to each other, and upper and lower flange portions. A seismic isolation structure having a connecting tool that connects the top and bottom with an elastic material. Abutting surfaces that contact each other with a contact width in the width direction intersecting the crane traveling direction and transmit a load in the vertical direction are formed on the opposing surfaces of the upper and lower flange portions, respectively. A gap that allows the inclination of the flange portion is formed between the upper and lower flange portions on the outer sides of both end portions in the width direction of the contact surface. An elastic-plastic brace for connecting the upper and lower flange portions up and down is provided.

According to the second aspect of the present invention, in the seismic isolation support device for a traveling crane according to the first aspect, the elastic-plastic brace is a center position in the width direction or the center position of the upper and lower flange portions. With respect to the width direction.

According to a third aspect of the present invention, in the seismic isolation support device for a traveling crane according to the first or second aspect, the connector is a center position in the width direction of the upper and lower flange portions or the It arrange | positions in the position which becomes symmetrical with respect to the center position in the said width direction.

According to a fourth aspect of the present invention, in the seismic isolation support device for a traveling crane according to any one of the first to third aspects, a vertical direction is provided at an end of the contact surface in the width direction. A fulcrum pin that supports the load and serves as a fulcrum for the inclination of the upper and lower flange portions is provided.

According to the present invention, the support leg can be held with high support rigidity during normal operation, and the support leg can be bent when a large-scale earthquake occurs. In addition, the seismic isolation effect can be enhanced by extending the base isolation cycle with a simple configuration. Furthermore, when the support leg is restored from bending, the response acceleration can be reduced by suppressing the contact surface from contacting with an impact force.

It is a schematic front view which shows the crane main body in one Embodiment of this invention. It is a front view which shows the seismic isolation support apparatus in one Embodiment of this invention in detail. FIG. 2B is a plan view taken along line IIB-IIB in FIG. 2A. It is a side view of an elastic-plastic brace. FIG. 3B is an arrow view taken along line IIIB-IIIB in FIG. 3A. It is a front view which shows the state which the support leg of FIG. 2A bent. It is a top view which shows the 1st modification of one Embodiment of this invention. It is a top view which shows the 2nd modification of one Embodiment of this invention. It is a top view which shows the 3rd modification of one Embodiment of this invention. It is a graph which shows the relationship between the load and displacement of an elastic material in a seismic isolation structure. It is a graph which shows the relationship between the load and displacement of an elastic-plastic brace.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a crane body 1 constituting at least a part of a traveling crane (not shown) used in a harbor portion. The crane body 1 includes a horizontal member 2, a sea-side support leg 3 and a land-side support leg 4 that are integrally fixed by the horizontal member 2. The horizontal member 2, the sea-side support leg 3, and the land-side support leg 4 form a gate-shaped leg structure. The wheels 5 provided at the lower ends of the sea side support legs 3 and the land side support legs 4 are configured to be able to travel along the sea side rails 6 and the land side rails 7 on the quay. That is, the crane main body 1 is configured to be movable in a direction perpendicular to a plane including the gate-shaped leg structure (direction perpendicular to the paper surface of FIG. 1).

The seismic isolation support device 100 according to an embodiment of the present invention is provided on the upper part of each of the sea side support legs 3 and the land side support legs 4. The base isolation support device 100 includes a base isolation structure 200 and an elastic-plastic brace 300.

The sea-side support leg 3 includes an upper member 3a and a lower member 3b that are divided vertically, and the land-side support leg 4 includes an upper member 4a and a lower member 4b that are divided vertically.
The seismic isolation structure 200 is provided in each connection part of

upper member

3a, 4a and

lower member

3b, 4b, respectively. Each seismic isolation structure 200 is divided into upper and lower parts and can be connected to upper and

lower flange parts

8 and 9, and a connecting tool that vertically connects the upper and

lower flange parts

8 and 9 via an elastic material 13 to be described later. 14. The upper and

lower flange portions

8 and 9 are formed so as to protrude outward from the periphery of the

support legs

3 and 4.

As shown in FIG. 2A, the opposing surfaces of the upper and

lower flange portions

8 and 9 have a predetermined contact width L in the left-right direction (width direction) orthogonal to the crane traveling direction (direction perpendicular to the paper surface). Horizontal contact surfaces 10 are respectively formed. The contact surfaces 10 on the opposing surfaces of the upper and

lower flange portions

8 and 9 are in contact with each other. The contact surface 10 is configured to be able to transmit the load of the

upper members

3a, 4a, etc., to the

lower members

3b, 4b in the vertical direction (the vertical direction of the paper). Further,

gaps

11 and 12 that allow the

flange portion

8 or 9 to be inclined are formed between the upper and

lower flange portions

8 and 9 outside the both ends of the contact surface 10 in the left-right direction. Accordingly, both end portions of the contact surface 10 in the left-right direction can be fulcrums when the

flange portions

8 or 9 are inclined.

The connecting tool 14 connects the both ends in the left-right direction in which the

gaps

11 and 12 in the

flange portions

8 and 9 are formed via the elastic material 13 up and down.

The elastic member 13 shown in FIGS. 2A and 2B has a configuration in which spring elements 13s such as a plurality of disc springs are fastened by a connector 14. The resilience strength (spring constant) of the elastic member 13 and the tightening strength by the coupler 14 are determined so as to obtain a predetermined precompression force in accordance with the magnitude of the assumed earthquake. The cross-sectional shape in the horizontal direction of the

support legs

3 and 4 of the large crane main body 1 is generally a rectangular shape as shown in FIG. 2B. The outer elastic member 13A and the inner elastic member 13B are arranged in a row (in a row in the crane traveling direction) so as to sandwich the left and right side plates 15 of the

support legs

3 and 4, respectively. The

elastic members

13A and 13B shown in FIG. 2B are arranged at positions corresponding (symmetrical) in the left-right direction with respect to the center positions in the left-right direction of the upper and

lower flange portions

8, 9. That is, the connector 14 is disposed at a position that is symmetrical in the left-right direction with respect to the center position in the left-right direction of the upper and

lower flange portions

8, 9.

The contact surface 10 of the

flange portions

8 and 9 is formed so as to be located at the center between the left and

right side plates

15 and 15. Further, the

gaps

11 and 12 formed on both sides of the contact surface 10 in the left-right direction are formed by providing an inclined surface 16 on the upper surface of the lower flange portion 9 as shown in FIGS. 1 and 2A. Forming. The inclination angle α of the inclined surface 16 is determined from the magnitude of the assumed earthquake and the length of the

lower members

3b, 4b of the

support legs

3, 4. The

gaps

11 and 12 may be formed by providing inclined surfaces on the lower surface of the upper flange portion 8, and inclined surfaces on both the lower surface of the upper flange portion 8 and the upper surface of the lower flange portion 9. You may form by providing. Further, the

gaps

11 and 12 may be parallel gaps formed between the upper and

lower flange portions

8 and 9 in addition to the inclined surfaces. That is, the lower surface and the upper surface of the upper and

lower flange portions

8 and 9 forming the

gaps

11 and 12 may be formed in parallel to each other.

At the positions of both end portions in the left-right direction of the contact surface 10, fulcrum pins 17, 18 extending in the front-rear direction (crane traveling direction) along the both end portions are provided. The fulcrum pins 17 and 18 are configured to transmit the load of the

upper members

3a and 4a to the

lower members

3b and 4b and serve as fulcrums when the upper and

lower flange portions

8 and 9 are inclined and opened. . In this case, it is possible to prevent the upper and

lower flange portions

8 and 9 from being relatively displaced in the left-right direction by providing the upper and

lower flange portions

8 and 9 with concave grooves that engage with the fulcrum pins 17 and 18. In addition, without providing the fulcrum pins 17 and 18, the load of the

upper members

3a and 4a is transmitted to the

lower members

3b and 4b by the contact surface 10, and the flanges with both end portions in the left-right direction of the contact surface 10 as fulcrums. You may comprise so that the

parts

8 and 9 may incline.

The seismic isolation structure 200 is formed by the contact surfaces 10 and the

gaps

11 and 12 provided in the

flange portions

8 and 9, the elastic material 13 and the coupling tool 14, and the fulcrum pins 17 and 18.

Moreover, although the case where the elastic member 13 is configured by the spring element 13s such as a pre-compressed disc spring has been described, a pre-compressed compression spring or a pre-compressed elastic rubber may be used as the elastic member.

As shown in FIGS. 1, 2A and 2B, an elastic-plastic brace 300 configured to connect the

flange portions

8 and 9 vertically is provided at the center position of the upper and

lower flange portions

8 and 9 in the left-right direction. It has been.

An example of the elastoplastic brace 300 includes a steel plate 19 and a buckling restraint 21 as shown in FIGS. 3A and 3B. The steel plate 19 is formed of an elastoplastic history steel material having a yield point set lower than that of the steel material constituting the crane body 1 (support legs 3 and 4) of FIG. 1, and is assembled so as to have a cross shape when viewed from the vertical direction. In addition, it is configured to extend in the vertical direction. The buckling restraining material 21 is provided so as to surround an intermediate portion in the length direction of the steel plate 19 assembled in a cross shape, and the inside thereof is filled with a mortar 20 for buckling prevention. Note that the elastoplastic hysteresis steel material is a steel material that is elastically deformed in a range where the displacement is small and plastically deforms when the displacement exceeds a predetermined value.
The steel plate 19 is formed with a bolt hole 24A into which a fixing bolt 24 described later is inserted.

3A and 3B are arranged so as to penetrate through the openings 22 formed in the upper and

lower flange portions

8 and 9 in FIG. 2A. The upper end of the elastoplastic brace 300 is fixed to a fixing member 23 a provided on the upper surface of the upper flange portion 8 with bolts 24, and the lower end of the elastoplastic brace 300 is fixed to the lower surface of the lower flange portion 9. It is fixed to the member 23b with bolts 24.

As shown by a solid line in FIG. 2B, the elastoplastic brace 300 has a center position in the left-right direction inside the fulcrum pins 17 and 18 that set the contact width L (see FIG. 2A) of the

flange portions

8 and 9. And it is provided in one place of the center position (up-down center position of FIG. 2B) in a crane traveling direction.
Note that a plurality of elastoplastic braces 300 may be provided at the center positions of the

flange portions

8 and 9 in the left-right direction as shown by the broken lines in FIG. 2B. That is, a plurality of elastoplastic braces 300 may be arranged side by side in the crane traveling direction at the center position of the

flange portions

8 and 9 in the left-right direction. Furthermore, it may be provided in a plurality of rows inside the fulcrum pins 17 and 18 (in the crane traveling direction). As described above, in FIGS. 1, 2 A and 2 B, the elastic-plastic brace 300 is disposed inside the fulcrum pins 17 and 18, and the elastic member 13 (connector 14) is disposed outside the fulcrum pins 17 and 18. is doing.

As shown in FIGS. 2A and 2B, the left and right end portions of the upper and

lower flange portions

8 and 9 are prevented from being displaced in the left and right directions, and the

upper members

3a and 4a are Each of the

members

3b and 4b is provided with a stopper 25 for preventing the

member

3b and 4b from being greatly bent and inclined. Further, stoppers 26 are provided at both ends of the upper and

lower flange portions

8 and 9 in the front-rear direction to prevent the upper and

lower flange portions

8 and 9 from being displaced in the front-rear direction.

FIG. 5 is a plan view showing a first modification of the embodiment of the present invention. FIG. 5 shows a configuration in which the elastic member 13 and the elastoplastic brace 300 are arranged outside the fulcrum pins 17 and 18 (outside in the left-right direction).
FIG. 5 shows a configuration in which the elastic-plastic brace 300 and the elastic material 13 are mixed and arranged outside the side plates 15 of the

support legs

3 and 4, but the elastic plates are arranged inside the side plates 15 and outside the fulcrum pins 17 and 18. The plastic brace 300 and the elastic material 13 may be mixed and arranged. Alternatively, the elastic-plastic brace 300 may be disposed on one of the inner side and the outer side of the side plate 15 and the elastic member 13 may be disposed on the other side.

6A and 6B are plan views showing second and third modifications of the embodiment of the present invention, respectively. 6A and 6B show a configuration in which the elastic member 13 and the elastic-plastic brace 300 are arranged on the inner side (the inner side in the left-right direction) than the fulcrum pins 17 and 18.
FIG. 6A shows a case where the elastic member 13 (connector 14) is arranged at the center position inside the fulcrum pins 17 and 18, and the elastic-plastic brace 300 is arranged on both the left and right sides of the elastic member 13. That is, the connector 14 is disposed at the center position in the left-right direction of the upper and

lower flange portions

8, 9. In addition, a plurality of elastoplastic braces 300 are arranged at positions that are symmetrical in the left-right direction with respect to the center position.
FIG. 6B shows a case where the elastic-plastic brace 300 is arranged at the center position inside the fulcrum pins 17, 18 and the elastic member 13 is arranged on both the left and right sides of the elastic-plastic brace 300. That is, the elastic-plastic brace 300 is disposed at the center position in the left-right direction of the upper and

lower flange portions

8, 9. Moreover, the some connector 14 (elastic material 13) is arrange | positioned in the position which becomes symmetrical in the left-right direction with respect to the said center position. In addition, the installation number and installation position of the elastic material 13 and the elastic-plastic brace 300 can be arbitrarily selected.

The elastic material 13 and the elastoplastic brace 300 described above are provided in the left and right directions of the upper and

lower flange portions

8 and 9 so that the same base isolation performance can be exhibited even when the upper and

lower flange portions

8 and 9 are inclined to the left and right. It is preferable to arrange them at the center position or at a position that is symmetrical in the left-right direction with respect to this center position.

Hereinafter, the operation of the above embodiment will be described.

1, 2 A, and 2 B, during normal crane work by a traveling crane, the contact surfaces 10 of the upper and

lower flange portions

8 and 9 are in close contact with each other due to the restoring force of the precompressed elastic material 13 of the seismic isolation structure 200. is doing. Therefore, the load in the vertical direction of the crane body 1 is reliably transmitted to the lower part through the contact surface 10, and the

support legs

3 and 4 are configured as a rigid structure and do not swing, so that the traveling crane can be operated satisfactorily. .

On the other hand, when a large earthquake occurs and a large excitation force A in the direction orthogonal to the traveling direction of the traveling crane is applied to the supporting

legs

3 and 4 of the crane body 1, the supporting legs are as shown in FIG. The

upper members

3a and 4a and the

lower members

3b and 4b are bent. That is, the upper flange portion 8 is inclined to the right with the right fulcrum pin 18 at the center (fulcrum) against the pre-compressed pre-load (pre-compression force) of the left elastic member 13. Thereafter, the flange portion 8 returns to the state of FIG. 2A mainly due to the restoring moment by the left elastic member 13. On the other hand, when the

upper members

3a, 4a and the

lower members

3b, 4b of the

support legs

3, 4 are bent to the opposite side, for example, the upper flange portion 8 is subjected to a preload (precompression force) of the right elastic member 13. Against this, the left fulcrum pin 17 is tilted to the left with the center (fulcrum) as the center. Thereafter, the

flange portions

8 and 9 return to the state shown in FIG. 2A mainly due to the restoring moment by the elastic material 13 on the right side.

5, 6 A, and 6 B, as in the case of FIG. 4, when an external force larger than the precompression force of the elastic member 13 acts on the

support legs

3, 4, the upper and

lower flange portions

8, 9 is inclined to open, and then the

flange portions

8 and 9 return to the closed state of FIG. 2A due to the restoring moment by the elastic material 13.

FIG. 7A shows a history of the relationship between the load and displacement of the elastic member 13 constituting the seismic isolation structure 200. In FIG. 7A, the load and displacement of the elastic body 13 in a state where the precompression force is applied are based on the vertical axis representing the load and the reference on the horizontal axis representing the displacement (intersection of the vertical axis and the horizontal axis). It is described as follows. When a large excitation force acts on the

support legs

3 and 4 and a force (load) exceeding the precompression force applied to the elastic material 13 acts on the elastic material 13, the elastic material 13 is displaced according to the load by an arrow. It increases as shown by a1 (inclined so that the

flange parts

8 and 9 open). On the other hand, when the force decreases, the displacement of the elastic member 13 decreases as indicated by the arrow a2 (openings of the

flange portions

8 and 9 are closed). At this time, as shown in FIG. 4, when the contact surfaces 10 come into contact with each other by closing from the state in which the

flange portions

8 and 9 are opened as shown in FIG. 2A, the contact surfaces 10 come into contact with an impact force, A large response acceleration may occur in the crane body 1.

On the other hand, as shown in FIGS. 1 to 5, since the elasto-plastic brace 300 for connecting the upper and

lower flange portions

8, 9 up and down is provided, only the seismic isolation structure 200 having the elastic member 13 is provided. In comparison, it is possible to prevent the occurrence of a large response acceleration in the crane body 1 when the openings of the

flange portions

8 and 9 are closed.

FIG. 7B shows the history of the relationship between the load and displacement of the elastic member 13 with a broken line and the history of the relationship between the load and the displacement of the elastic-plastic brace 300 with a solid line. An elastic-plastic brace 300 formed of an elastic-plastic history steel material or the like, first, when a tensile load is applied to the elastic-plastic brace 300 due to the inclination of the

flange portions

8 and 9, a linear load indicated by an arrow b1 − Displacement characteristics are shown. However, the elastoplastic brace 300 yields at a low load (yield point), and thereafter displaces in a state where the slope of the load-displacement characteristic is extremely small as indicated by an arrow b2. Further, when the applied load is reduced, a compressive force is applied to the elastic-plastic brace 300 by the restoring force of the elastic member 13, so that a linear load-displacement characteristic indicated by an arrow b3 is exhibited as in the case of a general steel material. However, the elastoplastic brace 300 yields again at a low load (yield point), and is displaced with a very small gradient of the load-displacement characteristic as indicated by an arrow b4. As described above, the elastic-plastic brace 300 draws a history having an area in the load-displacement characteristic until the upper and

lower flange portions

8 and 9 are opened and closed. It can be consumed and response (vibration) can be suppressed. When the elastic material 13 is provided but the elastic-plastic brace 300 is not provided, the restoring force corresponding to the precompression of the elastic material 13 is generated at the point where the

flange portions

8 and 9 are closed and the displacement becomes zero. To do. On the other hand, since the elastoplastic brace 300 provides a parallelogram history in the load-displacement characteristics by providing the elastoplastic brace 300, the load when the displacement returns to 0, that is, the

flange portions

8 and 9 are closed. Thus, the load when the contact surfaces 10 come into contact with each other can be reduced. That is, the elastoplastic brace 300 can act as a resistance (attenuator). Therefore, it is possible to reduce an impact force generated when the

flange portions

8 and 9 are closed from the opened state and the contact surfaces 10 come into contact with each other, and generation of a large response acceleration in the crane body 1 can be prevented.

Furthermore, the elastoplastic brace 300 has not only a function as a damping device but also a function of a spring element. In the conventional seismic isolation structure 200, when large seismic vibrations are targeted, the support point interval is increased in order to increase the horizontal force required when the seismic isolation structure 200 starts to operate (starts tilting at the flange portions 8 and 9). Need to be wide. That is, it is necessary to set a large distance between the fulcrum pins 17 and 18 in FIG. 2A.

On the other hand, the elastic-plastic brace 300 uses a steel plate 19 having a spring constant close to that of a general steel material. Therefore, since the elasticity of the steel plate 19 is added to the horizontal rigidity of the base isolation structure 200, the horizontal force required when the base isolation structure 200 starts operation can be increased. Therefore, the space | interval of the fulcrum pins 17 and 18 can be narrowed, and the seismic isolation support apparatus 100 can be reduced in size. Furthermore, since the horizontal rigidity of the seismic isolation structure 200 can be increased by installing the elastoplastic brace 300, the number of elastic members 13 installed is significantly larger than when only the conventional seismic isolation structure 200 is provided. Can be reduced.

6A and 6B, since the elastic material 13 is disposed inside the fulcrum pins 17 and 18, the amount of deformation of the elastic material 13 when the

flange portions

8 and 9 are opened is small. . As a result, since the amount of deformation required for the elastic material 13 is reduced, the elastic material 13 can be reduced in size. Further, when the elastic material 13 is arranged outside the fulcrum pins 17 and 18, only the elastic material 13 on the side where the

flange portions

8 and 9 are opened is deformed, and the elastic material 13 on the opposite side is not deformed. On the other hand, by disposing the elastic material 13 on the inner side of the fulcrum pins 17 and 18 as described above, the elastic material 13 can be deformed even if the

flange portions

8 and 9 are opened on either the left or right side. Therefore, in this case, it is possible to reduce the number of elastic members 13 and reduce the size and weight of the apparatus.

Further, as shown in FIGS. 2A and 2B and FIGS. 6A and 6B, when the elastic-plastic brace 300 is disposed inside the fulcrum pins 17 and 18, the elastic-plastic brace 300 when the

flange portions

8 and 9 are opened is used. Therefore, the elastic-plastic brace 300 can be reduced in size.

As described above, according to the seismic isolation support device 100 including the base isolation structure 200 having the elastic member 13 and the elastoplastic brace 300, the number of the elastic members 13 is reduced and the distance between the fulcrum pins 17 and 18 is increased. Even when a small configuration with a narrower width is adopted, the

support legs

3 and 4 during normal operation can be held with high support rigidity. Further, when an earthquake occurs, the elasticity of the steel plate 19 of the elasto-plastic brace 300 is added to the elasticity of the pre-compressed elastic material 13, so that the seismic isolation period can be expanded and the seismic isolation effect can be effectively enhanced. Furthermore, since the contact with the impact force of the contact surface 10 when the supporting

legs

3 and 4 are restored from the bent state is suppressed, the response acceleration in the crane body 1 can be reduced.

In the above embodiment, the seismic isolation support device 100 including the seismic isolation structure 200 having the elastic material 13 and the elastoplastic brace 300 is illustrated. However, by providing a fluid pressure damper in the seismic isolation support device, The seismic function can be further enhanced.

The present invention is not limited to the above-described embodiment, and is limited only by the scope of the appended claims. The various shapes and combinations of the constituent members shown in the above-described embodiments are merely examples, and various additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention. .
For example, the seismic isolation support device for a traveling crane of the present invention can be applied to support legs of various traveling cranes. In addition, various shapes and structures other than the illustrated example can be used for the elastic-plastic brace. In the said embodiment, although the left-right direction is demonstrated as a direction orthogonal to a crane traveling direction, it is not restricted to this, The direction which crosses a crane traveling direction may be sufficient as the left-right direction (width direction). .

The present invention can be used for a seismic isolation support device for a traveling crane that travels on rails with a gate-shaped support leg such as a container crane used in a harbor portion or the like.

1 Crane body 3 Seaside support legs (support legs)
4 Land-side support legs (support legs)
8, 9 Flange 10

Contact surface

11, 12 Gap 13 Elastic material

13A Elastic material

13B Elastic material 14

Connector

17, 18 Supporting pin 100 Seismic isolation support device 200 Seismic isolation structure 300 Elastic-plastic brace

Claims

A seismic isolation structure having upper and lower flange portions that are formed on the support legs of the crane main body and which can be connected to each other and a connecting tool for connecting the upper and lower flange portions up and down via an elastic material. Prepared,
Abutting surfaces that contact each other with a contact width in the width direction intersecting the crane traveling direction and transmit a load in the vertical direction are formed on the opposing surfaces of the upper and lower flange portions, respectively.
A gap allowing the inclination of the flange portion is formed between the upper and lower flange portions on both outer sides in the width direction of the contact surface,
A seismic isolation support device for a traveling crane provided with an elastic-plastic brace for connecting the upper and lower flange portions up and down.
The seismic isolation of the traveling crane according to claim 1, wherein the elastic-plastic brace is disposed at a center position of the upper and lower flange portions in the width direction or a position that is symmetrical with respect to the center position in the width direction. Support device.
2. The traveling crane's seismic isolation support according to claim 1, wherein the connector is disposed at a center position in the width direction of the upper and lower flange portions or a position that is symmetrical in the width direction with respect to the center position. apparatus.
2. The traveling crane according to claim 1, wherein a fulcrum pin that supports a load in a vertical direction and serves as a fulcrum of inclination of the upper and lower flange portions is provided at an end of the contact surface in the width direction. Seismic isolation support device.