Quay crane and control method thereof

Abstract

To provide a quay crane and its control method capable of improving the safety of a chassis and so on performing cargo handling operations in the neighborhood of the quay crane.SOLUTION: A leg structure 2 has in advance a lower horizontal member 6 extending in the lateral direction x and connecting a sea side leg 5a and a land side leg 5b. A sea side seismic isolator 4a is arranged in advance in the position above the lower horizontal member 6. A land side seismic isolator 4b is arranged in advance in the position below the lower horizontal member 6. The part of the sea side leg 5a that is below the lower horizontal member 6, a travel device 3 arranged in the position corresponding to the sea side leg 5a, and the lower horizontal member 6 are integrally oscillated when an earthquake occurs.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a quay crane equipped with a seismic isolation device and a control method thereof, and more particularly to a quay crane and a control method thereof that can improve the safety of a chassis and the like performing loading and unloading operations in the vicinity of the quay crane. [Background technology]

[0002] Various quay cranes equipped with seismic isolation devices have been proposed (for example, see Patent Document 1). Patent Document 1 discloses the configuration of a quay crane in which a seismic isolation device is installed between each of the four traveling gears and the leg structure.

[0003] In order to withstand large-scale earthquakes, it was necessary to enlarge the seismic isolation device. However, enlarging the seismic isolation device would increase the amplitude of the horizontal vibration of the quay crane during an earthquake. This meant that there was a possibility that the vibrating legs or seismic isolation device would collide with the chassis (vehicles) or workers performing loading and unloading work near the bottom of the leg structure. There was also a possibility that the vibrating legs would collide with ships docked at the quay. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2011-144044 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a quay crane and a control method thereof that can improve the safety of a chassis and the like performing loading and unloading operations in the vicinity of the quay crane. [Means for solving the problem]

[0006] A quay crane for achieving the above object includes a leg structure having a pair of sea-side legs and a pair of land-side legs, a traveling device installed at the lower end of the leg structure, sea-side seismic isolation devices arranged at positions corresponding to the pair of sea-side legs, and land-side seismic isolation devices arranged at positions corresponding to the pair of land-side legs, wherein the leg structure has a lower horizontal member extending in the lateral direction and connecting the sea-side legs and the land-side legs, the sea-side seismic isolation devices are arranged at a position above the lower horizontal member, and the land-side seismic isolation devices are arranged at a position below the lower horizontal member. The leg structure has an upper horizontal member that is extended in the running direction and connects the upper ends of the pair of sea-side legs, a first diagonal member whose upper end is connected to the sea-side leg and whose lower end is connected to the land-side leg, and a second diagonal member whose upper end is connected to the land-side leg at a position near the lower end of the first diagonal member and whose lower end is connected to the sea-side leg. The sea-side seismic isolation device is composed of a first sea-side seismic isolation device that is arranged above the upper end of the first diagonal member and below the upper horizontal member, and a second sea-side seismic isolation device that is arranged below the lower end of the second diagonal member. It is characterized by:

[0007] A control method for a quay crane for achieving the above object includes a leg structure having a pair of sea-side legs and a pair of land-side legs, a traveling device installed at the lower end of the leg structure, a sea-side seismic isolation device arranged at a position corresponding to the pair of sea-side legs, and a land-side seismic isolation device arranged at a position corresponding to the pair of land-side legs, wherein the leg structure already has a lower horizontal member extending in the lateral direction and connecting the sea-side legs and the land-side legs, the sea-side seismic isolation device is already arranged at a position above the lower horizontal member, and the land-side seismic isolation device is already arranged at a position below the lower horizontal member, The leg structure already has an upper horizontal member extending in the traveling direction and connecting the upper ends of the pair of sea-side legs, a first diagonal member having an upper end connected to the sea-side leg and a lower end connected to the land-side leg, and a second diagonal member having an upper end connected to the land-side leg at a position adjacent to the lower end of the first diagonal member and a lower end connected to the sea-side leg, and the sea-side seismic isolation device is already configured with a first sea-side seismic isolation device arranged at a position above the upper end of the first diagonal member and below the upper horizontal member, and a second sea-side seismic isolation device arranged at a position below the lower end of the second diagonal member, Of the above sea-side legs The second sea-side seismic isolation device The lower part, the running device arranged at a position corresponding to the sea-side leg, and the lower horizontal member are vibrated together in the event of an earthquake. Effect of the Invention

[0008] According to the present invention, the sea-side seismic isolation device is disposed at a position above the lower horizontal member, so that the amount of lateral displacement of the sea-side leg can be suppressed at a position below the sea-side seismic isolation device. Since the sea-side leg does not displace significantly in the lateral direction, it is advantageous for improving the safety of the chassis, etc. [Brief description of the drawings]

[0009] [Figure 1]FIG. 1 is an explanatory diagram illustrating an outline of a quay crane. [Diagram 2] FIG. 2 is an explanatory diagram illustrating the quay crane of FIG. 1 as viewed from the arrow AA. [Diagram 3] FIG. 2 is an explanatory diagram illustrating a state in which the quay crane in FIG. 1 is vibrating toward the sea side. [Figure 4] FIG. 2 is an explanatory diagram illustrating a state in which the quay crane in FIG. 1 is vibrating toward the land side. [Diagram 5] FIG. 2 is an explanatory diagram illustrating a modified example of FIG. [Figure 6] FIG. 6 is an explanatory diagram illustrating a state in which the quay crane in FIG. 5 is vibrating toward the sea side. [Figure 7] FIG. 6 is an explanatory diagram illustrating a state in which the quay crane in FIG. 5 is vibrating toward the land side. [Figure 8] FIG. 6 is an explanatory diagram illustrating a modified example of FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A quay crane and a method of controlling the same will be described below based on an embodiment shown in the drawings. In the drawings, the direction of travel of the quay crane is indicated by arrow y, the traverse direction perpendicular to the travel direction is indicated by arrow x, and the up-down direction is indicated by arrow z.

[0011] 1, a quay crane 1 includes a leg structure 2, a plurality of traveling devices 3 installed at the lower end of the leg structure 2, and a seismic isolation device 4. The quay crane 1 includes a container crane for loading and unloading containers and an unloader for loading and unloading bulk cargo such as ore.

[0012] The leg structure 2 has a sea-side leg 5a arranged on the sea side in the lateral direction x, a land-side leg 5b arranged on the land side, and a lower horizontal member 6 extending in the lateral direction x and connecting the sea-side leg 5a and the land-side leg 5b (hereinafter collectively referred to as legs 5).

[0013] As illustrated in Figure 2, the leg structure 2 has a pair of sea-side legs 5a arranged at a distance in the running direction y, an upper horizontal member 7a extending in the running direction y and connecting the upper ends of the pair of sea-side legs 5a, and a bottom horizontal member 8a extending in the running direction y and connecting the lower ends of the pair of sea-side legs 5a.

[0014] Similarly, the leg structure 2 has a pair of land-side legs 5b arranged with a gap in the traveling direction y, an upper horizontal member 7b extending in the traveling direction y to connect the upper ends of the pair of land-side legs 5b, and a bottom horizontal member 8b extending in the traveling direction y to connect the lower ends of the pair of land-side legs 5b. The sea-side upper horizontal member 7a and the land-side upper horizontal member 7b are sometimes collectively referred to as the upper horizontal member 7. The sea-side bottom horizontal member 8a and the land-side bottom horizontal member 8b are sometimes collectively referred to as the bottom horizontal member 8.

[0015] The leg structure 2 also has a diagonal member 9 that connects the sea-side leg 5a and the land-side leg 5b that are arranged opposite each other in the lateral direction x. In the embodiment illustrated in Fig. 1, the upper end of the diagonal member 9 is connected to the sea-side leg 5a and the lower end is connected to the land-side leg 5b. The lower end of the diagonal member 9 is located above the lower horizontal member 6.

[0016] As illustrated in Fig. 1, a girder 10 extending in the lateral direction x is disposed near the upper end of the leg structure 2, and a boom 11 extends from the sea side end of the girder 10 toward the sea side (the right side in Fig. 1). The girder 10 and the boom 11 are supported by the leg structure 2.

[0017] The traveling gear 3 is disposed below each of the four legs 5. In this embodiment, the four traveling gears 3 are installed at the lower end of the leg structure 2. Each traveling gear 3 has iron wheels. The traveling gear 3 allows the quay crane 1 to travel along a traveling direction y that crosses at a right angle the land-sea direction (transverse direction x).

[0018] In this embodiment, as illustrated in Figures 1 and 2, the seismic isolation device 4 is composed of a sea-side seismic isolation device 4a arranged at a position corresponding to the sea-side leg 5a and a land-side seismic isolation device 4b arranged at a position corresponding to the land-side leg 5b. As illustrated in Figure 2, the sea-side seismic isolation devices 4a are installed at positions corresponding to the pair of sea-side legs 5a. The quay crane 1 is equipped with two sea-side seismic isolation devices 4a and two land-side seismic isolation devices 4b.

[0019] The position corresponding to the sea-side leg 5a refers to a position midway in the extension direction (vertical direction z) of the sea-side leg 5a. The position corresponding to the land-side leg 5b refers to a position midway in the extension direction (vertical direction z) of the land-side leg 5b, as well as a position between the land-side leg 5b and the land-side traveling device 3 arranged below it. The above are sometimes collectively referred to as positions corresponding to the leg 5. The position corresponding to the leg 5 can also be said to be a position midway in the extension direction of the leg 5, or a position on an extension line of the extension direction.

[0020] 1, in this embodiment, the sea-side seismic isolation device 4a is configured to be disposed in a position above the upper end of the diagonal member 9 and below the sea-side upper horizontal member 7a. The sea-side seismic isolation device 4a is disposed in a position above the lower horizontal member 6.

[0021] The land-side seismic isolation device 4b is configured to be disposed between the lower ends of the land-side legs 5b and the land-side running gear 3. In detail, the land-side seismic isolation device 4b is configured to be disposed between the bottom horizontal member 8b that connects the lower ends of the land-side legs 5b and the land-side running gear 3. The land-side seismic isolation device 4b is disposed at a position lower than the lower horizontal member 6.

[0022] The seismic isolation device 4 is made of laminated rubber, for example. The seismic isolation device 4 made of laminated rubber is configured to be deformable only along the lateral direction x, for example. The seismic isolation device 4 may be configured to be deformable in the traveling direction y in addition to the lateral direction x. The configuration of the seismic isolation device 4 is not limited to laminated rubber. The seismic isolation device 4 may be configured by combining a slider configured to be slidable in the lateral direction x and a telescopic cylinder that generates a restoring force on the slider. The seismic isolation device 4 may also be configured by a telescopic cylinder that telescopes in the vertical direction z, or a tilting mechanism that tilts around the traveling direction y as a central axis.

[0023] As illustrated in FIG. 1, the first structure 2a is integrally configured, which is configured from the lower horizontal member 6 through the part of the sea-side leg 5a that is below the lower horizontal member 6 to the sea-side running device 3 that is arranged at a position corresponding to the sea-side leg 5a. In FIG. 1, the range of the first structure 2a is illustrated by encircling it with a dashed line for the sake of explanation. The first structure 2a is configured to include a part of the leg structure 2 and the sea-side running device 3. The first structure 2a being integrally configured refers to a state in which the seismic isolation device 4 is not arranged in the middle part of each member that constitutes the first structure 2a. It can also be said that the first structure 2a does not include the seismic isolation device 4. The quay crane 1 has a configuration in which the sea-side seismic isolation device 4a corresponding to the sea-side leg 5a is not installed at a position below the lower horizontal member 6.

[0024] It is desirable that the first structure 2a is configured such that each member is interconnected so as to vibrate with the same period when an earthquake occurs.

[0025] As illustrated in Figures 3 and 4, when an earthquake occurs, the seismic isolation device 4 becomes operable, and becomes deformable, for example, along the lateral direction x. For the sake of explanation, the position of the quay crane 1 in a stationary state before the earthquake occurs is shown by a dashed line in Figures 3 and 4. Figure 3 shows a state in which the boom 11, etc. of the quay crane 1 are displaced toward the sea (to the right in Figure 3) relative to the quay 12, while Figure 4 shows a state in which the boom 11, etc. are displaced toward the land side (to the left in Figure 4) relative to the quay 12.

[0026] When an earthquake occurs, the members constituting the first structure 2a vibrate as a unit. The sea-side traveling device 3 included in the first structure 2a vibrates together with the wharf 12, for example, along the lateral direction x. The members such as the boom 11 arranged above the sea-side seismic isolation device 4a and the land-side seismic isolation device 4b tend to remain in place due to inertial force. The boom 11 and the like vibrate significantly relative to the wharf 12, and this vibration is absorbed by the seismic isolation device 4.

[0027] The lower horizontal member 6 constituting the first structure 2a, a portion of the sea-side leg 5a that is below the lower horizontal member 6, and the sea-side traveling device 3 arranged at a position corresponding to the sea-side leg 5a vibrate together. The first structure 2a vibrates in the lateral direction x around the lower end of the sea-side traveling device 3. At this time, the first structure 2a is disconnected from the girder 10, the boom 11, etc. by the sea-side seismic isolation device 4a. Therefore, the amount of displacement of the sea-side leg 5a in the lateral direction x can be suppressed at a position below the lower horizontal member 6. The sea-side leg 5a does not displace significantly in the lateral direction x.

[0028] The chassis 13 performs loading and unloading by traveling between the sea-side leg 5a and the land-side leg 5b that are arranged opposite each other in the lateral direction x. Therefore, the lower horizontal member 6 is arranged at a position higher than the upper end of the chassis 13. The quay crane 1 can prevent the sea-side leg 5a from colliding with the chassis 13 in the event of an earthquake. Furthermore, if the lower horizontal member 6 is arranged at a position higher than the upper deck 14a of the ship 14, the sea-side leg 5a can be prevented from colliding with the ship 14. This is advantageous for improving the safety of the chassis 13, etc.

[0029] The land-side seismic isolation device 4b is arranged at a position lower than the lower horizontal member 6. Generally, the lower the seismic isolation device 4 is arranged at, the more the seismic isolation effect of the quay crane 1 can be improved. The land-side seismic isolation device 4b can efficiently suppress vibrations of the quay crane 1. In this configuration, the seismic isolation device 4 is not arranged at a position above the lower horizontal member 6 on the land-side leg 5b. As there is only one land-side seismic isolation device 4b arranged at a position corresponding to the land-side leg 5b, this is advantageous in suppressing an increase in the wheel load of the quay crane 1. Furthermore, vibrations of the boom 11 etc. transmitted to the land-side leg 5b are absorbed by the deflection of the land-side leg 5b.

[0030] The sea-side seismic isolation device 4a is located at a higher position than the land-side seismic isolation device 4b, and therefore is less efficient than the land-side seismic isolation device 4b, but it still exerts a seismic isolation effect that suppresses the vibration of the quay crane 1.

[0031] Vibrations can also be absorbed by the deflection of the sea-side leg 5a below the sea-side seismic isolation device 4a. This is advantageous for improving the seismic isolation effect. The displacement of the sea-side leg 5a is not so large in the portion of the sea-side leg 5a below the lower horizontal member 6. This improves the safety of the chassis 13, etc.

[0032] The quay crane 1 has a configuration in which the sea-side seismic isolation device 4a is positioned higher than the land-side seismic isolation device 4b in the vertical direction z. On the sea side, the displacement of the sea-side leg 5a below the sea-side seismic isolation device 4a is suppressed, while on the land side, vibrations of the part above the land-side seismic isolation device 4b can be efficiently absorbed. This is advantageous for suppressing the displacement of the sea-side leg 5a while suppressing a decrease in the seismic isolation effect of the quay crane 1. Even if the seismic isolation device 4 is enlarged to accommodate a large-scale earthquake, the quay crane 1 can improve safety while obtaining the seismic isolation effect.

[0033] 1 and 2, it is possible to install a cable reel 15 at a position lower than the sea-side seismic isolation device 4a. For example, the cable reel 15 can be installed on the lower horizontal member 6 or the traveling gear 3. The cable reel 15 is a device for winding up a cable for connecting the quay crane 1 to a power source arranged on the quay 12.

[0034] This can prevent the sea-side leg 5a and the sea-side traveling device 3 from being relatively displaced in the lateral direction x during an earthquake and colliding with the cable reel 15. It is possible to arrange the cable reel 15 at a low position relatively close to the quay wall 12.

[0035] As illustrated in Fig. 5, the quay crane 1 may be configured to include a diagonal member 9 whose upper end is connected to the land-side leg 5b and whose lower end is connected to the sea-side leg 5a. In this embodiment, the lower end of the diagonal member 9 is connected to the sea-side leg 5a in a state where it is higher than the lower horizontal member 6. The sea-side seismic isolation device 4a is disposed in a position lower than the lower end of the diagonal member 9 and higher than the lower horizontal member 6.

[0036] As illustrated in Figures 6 and 7, when an earthquake occurs, the seismic isolation device 4 becomes operable, and becomes deformable, for example, in the lateral direction x. For the sake of explanation, the position of the quay crane 1 in a stationary state before the earthquake occurs is shown by a dashed line in Figures 6 and 7. Figure 6 shows a state in which the boom 11, etc. of the quay crane 1 are displaced toward the sea (to the right in Figure 6) relative to the quay 12, while Figure 7 shows a state in which the boom 11, etc. are displaced toward the land (to the left in Figure 7) relative to the quay 12.

[0037] When an earthquake occurs, the members constituting the first structure 2a vibrate as a unit. Therefore, as in the embodiment illustrated in Fig. 1, etc., the displacement of the sea-side leg 5a in the lateral direction x can be suppressed at a position lower than the lower horizontal member 6. This is advantageous for improving the safety of the chassis 13, etc.

[0038] The part of the sea-side leg 5a that is above the sea-side seismic isolation device 4a is connected to the land-side leg 5b via a diagonal member 9. Vibrations of the members located above the sea-side seismic isolation device 4a are suppressed by the land-side seismic isolation device 4b in addition to the sea-side seismic isolation device 4a.

[0039] The mass of the members arranged above the sea-side seismic isolation device 4a and the land-side seismic isolation device 4b is larger than that of the embodiment illustrated in Fig. 1 etc. This is advantageous in improving the seismic isolation effect because the mass of the portion separated by the seismic isolation device 4 from the quay wall 12 that vibrates during an earthquake becomes relatively large.

[0040] The sea-side seismic isolation device 4a only needs to be configured to be disposed at a position at least above the lower horizontal member 6. For example, in the embodiment illustrated in Fig. 1, the position at which the sea-side seismic isolation device 4a is disposed is not limited to a position above the upper end of the diagonal member 9. The sea-side seismic isolation device 4a may be disposed at a position below the upper end of the diagonal member 9. For example, in the embodiment illustrated in Fig. 5, the position at which the sea-side seismic isolation device 4a is disposed is not limited to a position below the lower end of the diagonal member 9. The sea-side seismic isolation device 4a may be disposed at a position above the lower end of the diagonal member 9.

[0041] The sea-side seismic isolation device 4a can be disposed at any position within a range below the sea-side upper horizontal member 7a and above the lower horizontal member 6. In the embodiment illustrated in Fig. 1, the sea-side seismic isolation device 4a may be disposed at a height just above the lower horizontal member 6, for example. In the embodiment illustrated in Fig. 5, the sea-side seismic isolation device 4a may be disposed at a height just below the sea-side upper horizontal member 7a, for example. In other words, the height at which the sea-side seismic isolation device 4a is disposed may be determined regardless of the state of the diagonal members 9.

[0042] As illustrated in Fig. 8, the quay crane 1 may be configured to include a first diagonal member 9a whose upper end is connected to the sea-side leg 5a and whose lower end is connected to the land-side leg 5b, and a second diagonal member 9b whose upper end is connected to the land-side leg 5b and whose lower end is connected to the sea-side leg 5a. The upper end of the second diagonal member 9b is connected to a position near the lower end of the first diagonal member 9a.

[0043] In this embodiment, the quay crane 1 is equipped with a first sea-side seismic isolation device 4c arranged at a position above the upper end of the first diagonal member 9a and below the upper horizontal member 7a, and a second sea-side seismic isolation device 4d arranged at a position below the lower end of the second diagonal member 9b and above the lower horizontal member 6. That is, in this embodiment, the sea-side seismic isolation device 4a has the first sea-side seismic isolation device 4c and the second sea-side seismic isolation device 4d.

[0044] When an earthquake occurs, the members constituting the first structure 2a vibrate as a unit. Therefore, as in the embodiment illustrated in Fig. 1, etc., the displacement of the sea-side leg 5a in the lateral direction x can be suppressed at a position lower than the lower horizontal member 6. This is advantageous for improving the safety of the chassis 13, etc.

[0045] The part of the sea-side leg 5a sandwiched between the first sea-side seismic isolation device 4c and the second sea-side seismic isolation device 4d, the first diagonal member 9a and the second diagonal member 9b vibrate together with the land-side leg 5b above the land-side seismic isolation device 4b. The vibration of these members is absorbed by the deflection of the land-side leg 5b.

[0046] In the quay crane 1 of this embodiment, the first sea side seismic isolation device 4c and the second sea side seismic isolation device 4d become nodes when vibrating due to an earthquake. Compared to the embodiment illustrated in Fig. 1 or Fig. 5, the quay crane 1 of this embodiment has more nodes when vibrating. This is advantageous for improving the seismic isolation effect against long-period vibration. Since two sea side seismic isolation devices 4c, 4d are installed for one sea side leg 5a, this configuration can be adopted for a quay 12 that can tolerate an increase in the wheel load of the quay crane 1. On the other hand, if it is desired to suppress the increase in the wheel load of the quay crane 1, it is desirable to adopt the configuration illustrated in Fig. 1 or Fig. 5. [Explanation of symbols]

[0047] 1. Quay crane 2 leg structure 2a First structure 3 Running gear 4. Seismic isolation device 4a Sea-side seismic isolation device 4b Land-side seismic isolation device 4c First sea-side seismic isolation device 4d Second sea side seismic isolation device 5 legs 5a sea side leg 5b Land leg 6 Lower horizontal member 7 Upper horizontal member 7a (sea side) upper horizontal member 7b (Land side) Upper horizontal member 8 Bottom horizontal member 8a (sea side) bottom horizontal member 8b (Land side) Bottom horizontal member 9 Diagonals 9a First diagonal member 9b Second diagonal member 10. Ghada 11. Boom 12 Quay 13 Chassis 14 Ships 14a Upper deck 15 Cable reel x transverse direction y Travel direction z Vertical direction

Claims

1. A quay crane comprising a leg structure having a pair of sea-side legs and a pair of land-side legs, a traveling device installed at a lower end of the leg structure, sea-side seismic isolation devices respectively arranged at positions corresponding to the pair of sea-side legs, and land-side seismic isolation devices respectively arranged at positions corresponding to the pair of land-side legs, The leg structure has a lower horizontal member extending in a lateral direction and connecting the sea-side leg and the land-side leg, The sea-side seismic isolation device is configured to be disposed at a position above the lower horizontal member, and the land-side seismic isolation device is configured to be disposed at a position below the lower horizontal member, The leg structure has an upper horizontal member extending in the traveling direction and connecting the upper ends of the pair of sea-side legs, a first diagonal member having an upper end connected to the sea-side leg and a lower end connected to the land-side leg, and a second diagonal member having an upper end connected to the land-side leg at a position adjacent to the lower end of the first diagonal member and a lower end connected to the sea-side leg, A quay crane characterized in that the sea-side seismic isolation device is composed of a first sea-side seismic isolation device arranged in a position above the upper end of the first diagonal member and below the upper horizontal member, and a second sea-side seismic isolation device arranged in a position below the lower end of the second diagonal member.

2. 2. A quay crane as described in claim 1, wherein a first structure consisting of the range from the lower horizontal member, through a portion of the sea-side leg that is below the lower horizontal member, to the traveling device arranged at a position corresponding to the sea-side leg, is an integrated structure that does not include a seismic isolation device.

3. A control method for a quay crane including a leg structure having a pair of sea-side legs and a pair of land-side legs, a traveling device installed at a lower end of the leg structure, a sea-side seismic isolation device arranged at a position corresponding to the pair of sea-side legs, and a land-side seismic isolation device arranged at a position corresponding to the pair of land-side legs, comprising: The leg structure already has a lower horizontal member that is extended in the lateral direction and connects the sea-side leg and the land-side leg, the sea-side seismic isolation device is already arranged in a position above the lower horizontal member, and the land-side seismic isolation device is already arranged in a position below the lower horizontal member, The leg structure already has an upper horizontal member extending in the traveling direction and connecting the upper ends of the pair of sea-side legs, a first diagonal member having an upper end connected to the sea-side leg and a lower end connected to the land-side leg, and a second diagonal member having an upper end connected to the land-side leg at a position adjacent to the lower end of the first diagonal member and a lower end connected to the sea-side leg, The sea-side seismic isolation device is previously configured with a first sea-side seismic isolation device arranged at a position above the upper end of the first diagonal member and below the upper horizontal member, and a second sea-side seismic isolation device arranged at a position below the lower end of the second diagonal member, A control method for a quay crane, characterized in that the part of the sea side leg that is below the second sea side seismic isolation device, the traveling gear arranged at a position corresponding to the sea side leg, and the lower horizontal member are vibrated together when an earthquake occurs.

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