KR19980086506A - Container crane - Google Patents

Abstract

The present invention relates to reducing the weight of the container crane and the unloading time.

In the container crane of the present invention, among the three trolleys that travel the guards 31 and 32, the central trolley 60 carries the container from each of the hanging tools 42 and 46 of both trolleys 41 and 45. The mounting base 61 is provided. The trolley 60 hangs the pedestal 61 with the rope 62. The unloading operation hangs the container with the trolley 45 and loads it on the base 61. The container of the pedestal 61 is suspended by the trolley 41 and lowered to the land side. The height position of the base 61 is the height based on the minimum height which the trolley 45 can run in the state which suspended the container. As the unloading operation proceeds, the height position of the pedestal 61 gradually descends. At the time of shipment, the position of the base 61 rises gradually. The auxiliary beam 37 traveling of the trolley 60 is located on the land side rather than the connection point between the tension bar 28 and the boom 32.

Description

Container crane

The present invention relates to a crane for unloading a container.

There is a demand for efficient container unloading. For this reason, as shown in Unexamined-Japanese-Patent No. 7-68036, there exist one container crane with two trolleys which hold | maintain a container, and the crane provided with the trolley which loads a container between these two trolleys. Three trolleys are intended to drive the crane's guards (including the boom). The center trolley relays the container, and the pedestal of the container is suspended from the trolley.

When the sea side trolley lifts the container from the boat, one or both of the trolley and the relay trolley are driven, and the trolley places the base of the relay trolley at the bottom of the hanging container and loads the container on the base. Next, one or both of the relay trolley and the trolley on the land side is driven to position the container of the relay trolley at the bottom of the trolley on the land side and the container is moved to the trolley on the land side. The land trolley lowers the container onto the land.

As shown in Japanese Patent Application Laid-Open No. 59-149889, the lifting and lowering of the base of the relay trolley is provided freely. However, the steel frame is between the base and the trolley. Also, the trolley on the land side does not run.

In Japanese Unexamined Patent Publication No. 5-97251, a second guider is mounted on the lower side of the boom on which the trolley travels, the same length as that of the boom, on which a trolley carrying a container runs. The trolley is suspended by a trolley, loaded onto a trolley, and the trolley travels toward the legs of the crane, which is conveyed from the platform to the ground. The second guard, on which the trolley travels, moves up and down.

Japanese Unexamined Patent Publication No. 61-39749 discloses that a second guide with a conveyor is provided at the bottom of the travel range of two trolleys, and the second guide is moved in the traveling direction of the trolley and moved up and down. . The end of the second guard is located above the ship's container.

The relay trolleys of Japanese Patent Application Laid-Open No. 7-68036 and Japanese Patent Application Laid-Open No. 59-149889 are connected by steel frames between a pedestal for loading a container and a trolley for driving a guard. There is a significant height distance between the pedestal and the trolley. The pedestal carries tens of tons of containers. In particular, since the relay trolley carries a container and travels, the steel frame becomes large and popular. For this reason, the trolley, the guard, the boom, and the leg which support this also become a mass.

Moreover, the height position of the base of the relay trolley of the said Japanese Unexamined-Japanese-Patent No. 7-68036 becomes a position higher than the highest part of the container piled up on the deck of a ship. For this reason, the relay trolley can be located above the boat. However, since the pedestal is suspended by steel frame, the height of the pedestal cannot be changed. The base of the relay trolley of Japanese Patent Application Laid-Open No. 59-149889 may be elevated, but not near the deck of the ship. Therefore, even when the unloading operation is carried out, the trolley on the sea side and the trolley on the land side need to raise the hanging tool to a high position and it takes time for the unloading operation. The same applies to loading a container into a boat.

The second guards of Japanese Patent Laid-Open Publication No. 5-97251 and Japanese Laid-Open Patent Publication No. 61-39749 are large and popular because of their long length.

Since the hanging tool of the sea side trolley of JP-A-597251 goes up and down through the second guard, it is necessary to prevent collision with the traveling truck, so that sufficient control is required to improve the loading efficiency.

Japanese Unexamined Patent Application Publication No. 61-39749 has a horizontal displacement of the second guard, which limits the unloading position on the land side.

A first object of the present invention is to reduce the weight of a container crane having a relay trolley.

A second object of the present invention is to shorten the unloading time of the traveling container of the relay trolley.

1 is a side view of a crane of one embodiment of the present invention,

Figure 2 is a side view of the crane of one embodiment of the present invention and a diagram illustrating a unloading operation method,

Figure 3 is a side view of the crane of one embodiment of the present invention and explaining the unloading operation method,

4 is a longitudinal sectional view of the boom from the position of the guard of FIG. 1;

5 is a plan view of the boom of FIG. 1;

6 is a side view of the trolley of FIG. 1;

7 is a side view of the connecting portion of the boom and the boom of FIG.

8 is a plan view of FIG.

9 is a longitudinal sectional view of the crane of another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

31: Garder 32: Boom

37, 37b: auxiliary beams 35, 38, 39: rail

41, 45: trolley 42, 46: hanging tool

60, 60b: relay trolley 61: hanging tool

The first purpose is that the girder and the boom have a first rail on which both two trolleys travel, and a second rail on which a central trolley travels, the second rail being outside the horizontal direction of the girder and the boom. And the position of the sea end of the second rail, the suspension of the sea trolley located at the sea side than the center trolley with the center trolley positioned at the end. This can be achieved by being in a position where the tool can be elevated.

The second object can be achieved by raising and lowering the base of the trolley for relaying by the rope and inclining the rope at the same time.

An embodiment of the present invention will be described with reference to FIGS. 1 to 8. In FIG. 1, the container crane 20 is unloaded between the ship S and the land side vehicle (not shown). The crane 20 is provided with the guard 31 horizontally on the upper part of the four legs 21 and 22. As shown in FIG. The boom 32 which rotates to the upward direction from a horizontal state is provided in the sea side of the guard 31. As shown in FIG. The upper end of the mast 24 provided above the leg 22 and the guard 31 of the leg 21 side are connected by the tension bar 27. As shown in FIG. The upper end of the mast 24 and the boom 32 are connected by tension bars 28 and 29. Tension bars 28 and 29 are made of links or ropes. There is a rope to rotate the boom, but not shown.

It has three trolleys 41, 45, and 60 that travel the guard 31 and the boom 32. The boom 32 is one of the guards. It may also be called the beam. The trolley 41 is on the land side, and unloads the container between the land side and the pedestal 61 of the relay trolley 60. The trolley 45 unloads the container between the ship S and the pedestal 61 of the relay trolley 60. The trolley 45 runs from the sea end of the boom 32 to near the land end of the guard 31.

The trolley 41 travels from the land side unloading position to the relay position with the trolley 60. The unloading position on the land side is located between the bridge 21 on the land side and the bridge 22 on the sea side, or on the land side than the bridge 21 on the land side. Here, the leg 21 and the leg 22 are the unloading positions, and a guide for guiding the lifting and lowering of the hanging tool 42 and the container C is provided. The relay position is in the range of the position of the boom 32 to the upper side of the ship S between the legs 21 and 22.

The trolley 45 mainly runs between the upper side of the ship S (position of the boom 32) and the trolley 60. As shown in FIG. The range of the relay positions of the trolley 45 and the trolley 60 ranges from the position close to the leg 22 between the legs 21 and 22 and above the ship S.

The trolleys 41 and 45 suspend the hanging tools 42 and 46 which attach and detach a container from the top via a rope. Suspension tools 42 and 46 are elevated by a reel device (not shown).

The relay trolley 60 hangs the base 61 which mounts a container through the rope 62. As shown in FIG. The pedestal 61 allows the container to be loaded even when the container has a stacking cone attached to its bottom surface. The pedestal 61 can be elevated. The pedestal 61 can be lowered to the ground in consideration of the rope exchange.

4 and 5, the trolleys 41 and 45 run on rails 47 provided on the inner side of the boom 32 and the guard 31.

The guard 31 and the boom 32 each consist of two members in parallel. Two members are connected by a plurality of transverse beams 33. Below the inner side of each member of the guard 31 and the boom 32 is a rail 35 on which the trolleys 41 and 45 run. The auxiliary beam 37 for the trolley 60 is fixed to the outer side surface of each member of the guard 31 and the boom 32. The rails 38 and 39 are provided in the upper part of each member of the auxiliary beam 37, and the lower part of the outer side surface. Since the auxiliary beam 37 is integrated with the guard 31 and the boom 32, the auxiliary beam 37 is called a boom and is divided here for convenience. In addition, the auxiliary beam 37 may be included in the guard 31 and the boom 32. An assistant beam may simply be called a beam.

The trolley 60 is provided outside the auxiliary beam 37, and is divided in left and right. Each trolley 60 runs on rails 38 and 39. The trolley 60 is a wheel mounted on the upper surface of the rail 38, a wheel in contact with the inner side of the rail 38 (the other side of the trolley 60), and a wheel in contact with the side of the rail 39 (not shown in the drawings). Have each). This enables traveling while preventing the trolley 60 from falling. The frame of the trolley 60 is L-shaped in longitudinal section. The frame consists of a vertical piece 81 having wheels and the like, a horizontal piece 82 carrying the following traveling device and a winding device 70, and an inclined member 83 connecting both. That is, it is a contiever type. For this reason, a large space can be obtained above the horizontal piece 82. For this reason, apparatuses, such as the take-up apparatus 70, can be installed easily. In addition, even in a system in which a device such as a take-up device 70 or the like is installed in the machine room 50 (a rope trolley or a semi rope trolley), the rope can be easily arranged using a large space on the upper side.

Each trolley 60 has a traveling device (including an electric motor or the like) for driving the trolley 60 and a reeling device (including an electric motor or the like) 70 for elevating the hanging tool 61. The control device of the trolley 60 is located in the machine room 50 installed in the guard 31, and the traveling (including stopping) of the two trolleys 60 is synchronized, and the lifting and lowering of the hanging tool 61 is synchronized. I'm trying to. For this reason, the trolley 60 is equipped with various detectors. For example, a rotation amount detector of a wheel, a travel position detector, a rotation amount detector of a take-up device, and the like. The trolley 60 and the machine room 50 are connected with the curtain cable (not shown) similarly to the other trolleys 41 and 45.

As seen from the traveling direction of the trolley 60, the distance between the ropes 62a and 62b of one trolley 60 and the ropes 62a and 62b of the other trolley 60 is the hanging tools 42 and 46. ) And the length of the container. There is a leg 22 on the outside of these ropes 62a and 62b. The ropes 62a and 62b released from the take-up device 70 of each trolley 60 are fixed to one end of each end of the pedestal 61 via the sheaves 63a and 63b. As is apparent from Fig. 6, in one trolley 60, there are four ropes and four sheaves each. In addition, said "fixing to one point" is when it sees from the traveling direction of the trolley 60, and an actual fixed point is four points. In Fig. 6, when the positions of the sheaves 63a and 63b are the same position, the fixing points of the ropes 62a and 62b to the pedestal 61 can be the same position.

When viewed from the traveling direction of the trolley 60, the ropes 62a and 62b are inclined to the left and right objects with respect to the vertical line centered around each of the fixed points. The angle θ2 made by each of the ropes 62a and 62b with respect to the vertical line is the same. For this reason, the shake of the base 61 by the wind from the longitudinal direction of a container can be suppressed.

In addition, the apparatus for traveling of the trolley 60 and lifting the pedestal 61 can be installed in the machine room 50 without being installed in the trolley 60. In this case, the fixing points of the ropes 62a and 62b are not in the pedestal 61.

Also for the apparatus which performs traveling of each of the trolleys 41 and 45 and the lifting of the hanging tools 62 and 66, it may be provided in the trolleys 41 and 45, or may be provided in the machine room 50 of the guard 32. FIG. good.

6 is a view seen in a horizontal direction perpendicular to the running direction of the trolley. Four ropes 62a and 62b released from the drum 71 of the take-up device 70 are fixed to the base 61 via sheaves 63a and 63b. In the running direction of the trolley 60, the interval for hanging the rope from the trolley 60 is sufficiently larger than the interval of the fixing point to the pedestal 61 (the spacing of the pedestal 61). The angle of inclination θ1 of each rope with respect to the vertical line of each fixed point is the same. "62a, 62b" may be described as "62", and "63a, 63b" may be described as "63". The rope 62 may be a chain.

According to this, since the rope 62a, 62b between the trolley 60 and the base 61 is inclined, the shake of the base 61 by running of the trolley 60 can be suppressed. Moreover, since the rope 62a, 62b is being fixed to the base 61, the shake of the base 61 is easy to be suppressed. Furthermore, since two systems are provided, it is easy to suppress the shaking of the pedestal 61. Moreover, since the inclination angle (theta) 1 of each rope 62a, 62b is the same, the amount of winding of the rope of the drum 71 can be made the same.

In FIGS. 7 and 8, the guards 31, 37 and the booms 32, 37 are connected by pins 30. The pins 30 connect the brackets 31 and 37 and the brackets protruding upward from the booms 32 and 37. All the rails 35, 38, 39 are provided below the pin 30. Since the pin 30 is located above the rails 35, 38, and 39, the configuration of the bracket is simplified. Moreover, the connection part of rails can be made vertical. Although the wheel of the trolley 60 is carried on the horizontal surface of the upper surface of the rail 38, the rail 38 may be inclined inward.

The pin 30 can be provided below the rail 38. In this case, the connection part of the rail 38 of the guard 31 and the rail 38 of the boom 32 is provided in the side of the guard 31 rather than the pin 30, or in the side of the boom 32 rather than the pin 30. As shown in FIG. This connection part is inclined with respect to the waterline. When the connecting portion is provided on the side of the guard 31, the inclined surface of the end of the rail on the side of the guard 31 is located above the inclined surface of the end of the rail on the boom 32 side. When the connecting portion is provided on the boom 32 side, the relationship between the inclined surfaces is reversed.

In this configuration, the case where the container C of the ship S is unloaded to the land side will be described. The relay trolley 60 stops between the position of the container C for unloading and the unloading position on the land side. The trolley 45 raises the hanging tool 46 holding the container C. As shown in FIG. If the bottom of the container has risen to a height that can travel toward the trolley 60, the ascending stops. In this state, the trolley 60 starts traveling toward the relay trolley 60. When the trolley 45 is stopped at the position of the stopped trolley 60, the hanging tool 46 is lowered to the base 61, and the container C is put down. In this way, conveyance from ship S is performed. Then, the hanging tool 46 is raised slightly, and the trolley 45 moves toward the sea toward the position of the next container C. The trolley 45 does so when the lifting and lowering of the hanging tool 46 can be performed simultaneously.

When the trolley 45 starts moving to the ship S side, the trolley 41 moves and stops in the position of the trolley 60. As shown in FIG. The trolley 41 keeps the height of the hanging tool 42 at a height based on the height of the upper surface of the container on the pedestal 61, and reaches the top of the pedestal 61. Then, the trolley 41 lowers the hanging tool 42, grabs the container C of the pedestal 61, lifts it up, runs up and runs toward the land side, and descends from the position of the guide 35, thereby lowering the vehicle on the ground. The container C is put down on the back. When the trolley 41 can carry out the descent | fall of the running tool and the hanging tool 42, it does so. In this way, conveyance to the land side is performed.

The stop position of the relay trolley 60 and the height position of the pedestal 61 are the unloading time of the trolley 45 from the ship S to the pedestal 61 and the unloading position of the pedestal 61 from the land side. The unloading time of the trolley 41 is determined to be approximately the same position. The waiting time of either trolley 41 or 45 is not increased. For this reason, the relay positions of the trolley 45 and the trolley 60 may become the upper side of the ship S. FIG. In general, when unloading the container on the deck of the ship (S), the trolley 60 is located near the bridge 22 toward the sea. When unloading the container in the dock, the trolley 60 is located above the ship (S). The stop position of the trolley 60 is near the position at which the hanging tool 46 is elevated into the dock.

The stop position of the relay trolley 60 and the height position of the pedestal 61 are calculated and determined by designation of the next container unloading position from the driver of the trolley 60. Or it is decided in turn by the unloading plan of the first container. The trolley 60 automatically operates.

The height position of the base 61 of the relay trolley 60 is demonstrated. The trolley 45 raises the container C to a height capable of hanging up the container C and traveling toward the pedestal 61. The height which can run is considered on the basis of the minimum height. Next, it runs toward the base 61 in the state which hold | maintained the height of the hanging tool 46 at that height. Stop the trolley 45 at the top of the pedestal 61 and lower the hanging tool 46. The height position of the base 61 is the height which can run the trolley 45 in the state which hung the container C, without changing the height of this container C. As shown in FIG. The height of the pedestal 61 is slightly lower than the bottom surface of the hanging container C. For this reason, when the base 61 is on the container of the deck of ship S, the bottom surface of a container is higher than the height of the base 61. As shown in FIG. When the trolley 45 stops above the pedestal 61, the hanging tool is lowered.

The case of unloading the container of the upper part of the container piled up on the deck of ship S is demonstrated. 1 is a case where the container at the position of C1 is unloaded while the unloading operation is initial, and the container at the position of C1 is suspended. The height position of the pedestal 61 is a height position slightly above the top surface of the container C2 of the highest portion on the pedestal 61 side than the position of C1. The bottom surface of the container C lifted up by the hanging tool 46 is higher than the base 61. The height of the container C2 is the height which becomes an obstacle in the running of the trolley 45. FIG.

If there is no container on the trolley 60 side than the container at the position C2 in FIG. 1, the height position of the pedestal 61 is lower than the upper surface of the container C2. In this case, when the trolley 46 passes over the container C2, the trolley 46 travels toward the base 61 and descends at the same time as the hanging tool 46.

In the case where the unloading operation is performed and the height of the container is lowered as shown in FIG. 2 and the unloading operation of the container at the position of C3 is performed, the height position of the pedestal 61 is closer to the pedestal 61 than the container C3. It is a height position slightly above the upper surface of the container C4 of the high part. The height of the container C4 is the height which becomes an obstacle in the running of the trolley 45. FIG. 2 shows a state in which the container C3 is lifted up.

In addition, when the unloading operation is carried out, and the container C5 in the dock is unloaded because the container on the deck disappears as shown in FIG. 3, the height at which the loaded container C5 can be driven can run on the deck. Height.

Since the height position of the pedestal 61 is lowered in accordance with the progress of the container unloading operation in this way, the operation of raising the hanging tool 46 of the trolley 45 becomes unnecessary, so that the unloading time can be shortened. In addition, since the height position of the pedestal 61 is lowered, the height position of the hanging tool 42 of the trolley 41 is also lowered. For this reason, the unloading time by the trolley 41 can also be shortened.

The height of the hanging tool 42 of the trolley 41 and the height of the hanging tool 46 of the trolley 45 are substantially the same. However, the height of the hanging tool 42 which picks up the container put on the base 61 may be lower depending on the holding method. For example, in the traveling direction of the trolley 41, when the rear flipper is projected downward, the trolley 41 is driven toward the pedestal 61, and the flipper is placed against the container of the pedestal 61. . In this case, since the base 61 is shaken, but the rope 62 extends at an angle, it is suppressed.

The height of the pedestal 61 may be higher than the bottom of the container when the trolley 45 runs, but it is not necessary to do so. The height position of the base 61 of the trolley 60 at the time of the unloading operation is a height based on the height which the trolley 45 which hangs a container toward the base 61 can run. More specifically, the hanging tool 46 is a height based on the height that the hanging container can be lowered and placed on the pedestal 61. The height position of the pedestal 61 may be sufficiently lower than the bottom of the container of the hanging tool 46 when the traveling of the trolley 45 and the lowering of the hanging tool 46 can be performed simultaneously.

The trolley 41 traveling toward the pedestal 61 at the unloading position raises the hanging tool 42 at the unloading position and stops the ascension slightly above the height of the pedestal 61. Next, the travel of the trolley 41 is started, the travel is stopped from above the pedestal 61, and the suspension tool 42 is lowered. The trolley 41 which picks up the container of the pedestal 61 raises the hanging tool 42 a little, and runs toward the load unloading position. The trolley 41 stops running and the hanging tool 42 is lowered at the load unloading position.

The trolleys 41 and 45 operate manually or automatically. The trolleys 41 and 45 may travel and lift at the same time. If traveling and lifting are not performed at the same time, control of the shaking stop of the hanging tool at the time of running can be made easy. In addition, since the height from the container of the ship S to the pedestal 61 is low, the effect of the trolley 45 running and lifting at the same time is small. The trolley 41 has a high possibility of simultaneously running and lifting. The trolley 60 runs and lifts automatically.

In the above embodiment, the stop position in the travel direction of the trolley 60 is changed according to the position of the container after the load is lifted from the ship, but it can be set to one travel position for a plurality of containers. This is to prevent shaking of the pedestal 61. The stop position of lifting and lowering of the base 61 can be similarly performed.

Since the pedestal 61 is suspended from the trolley 60 by the rope 62, it can be made light in weight compared with steel frame.

When the suspending tools 42 and 46 of the trolleys 41 and 45 receive the pedestal 61 and the container, the pedestal 61 may shake due to the shaking of the suspending tools 42 and 46. In order to prevent this, the extending angle of the rope 62 which hangs the pedestal 61 is increased.

The height position of the pedestal 61 of the trolley 60 when loading the onshore container on the ship S is based on the loading position of the ship S side, as can be understood from the above description. It is a height based on the height that the trolley 45 to lift the container from the () can run toward the ship. The height which can run is considered on the basis of the minimum height. The pedestal 61 gradually rises.

1 and 5, the auxiliary beams 37 (rails 38, 39) of the boom 32 are only on the guard 31 side near the connection point 28b of the boom 32 and the tension bar 28. . The trolley 60 cannot travel beyond this connection point 28b. For this reason, the loads of the auxiliary beam 37 and the trolley 60 are applied to the tension bar 28 but not to the tension bar 29. For this reason, the tension bar 29 does not need to be enlarged and can be made cheap. Moreover, the boom 32 can be made lightweight. The auxiliary beam 37 can also be made lightweight. The trolley 60 may travel beyond the connection point 28b with the tension bar 28, but the unloading times of the trolleys 41 and 45 at the position of the connection point 28b may be approximately the same. In a general crane, the connection point 28b is in a position where the unloading times of the trolleys 41 and 45 can be made approximately equal. Conversely, the position of the connection point 28b is selected as the position which can make the unloading time of the trolleys 41 and 45 substantially the same. In addition, the range which load only the tension bar 28 can be said that the center position of the trolley 60 in the running direction is the position where the extension line of the tension bar 28 and the rail 38 cross | intersect.

The position of the sea end of the sub beam 37 (rails 38 and 39) is suspended by the trolley 45 located on the sea side rather than the trolley 60 in the state where the trolley 60 is located at the end thereof. This is the position where the tool 46 can move up and down.

The position of the land end of the sub beam 37 (rails 38 and 39) requires that the trolley 60 be located on the land side at least than the bridge 22 on the sea side. There is no auxiliary beam 37 on the land side than the bridge 21 on the land side. This is to reduce the possibility of the crane falling over.

In the above embodiment, the trolley 60 does not travel in the state where the container is loaded, but may be loaded with the container for shortening of time. In this case, the trolley 41 on the land side can be fixed as in Japanese Patent Laid-Open No. 59-149889.

The case where the trolley 41 and the trolley 60 are installed by extension is demonstrated. The guard 31 and the boom 32 in the range in which the trolleys 41 and 60 travel are installed by welding or bolting the auxiliary beam on the outer side of the horizontal direction. Install the rails (38, 39) in the auxiliary beam. The machine room for the trolleys 41, 60 is installed separately on the guard 31. Further, the auxiliary beam is welded to the bottom surface of the member which is welded to the upper surface of the guard 31 and the boom 32 and protrudes outward. Auxiliary beam is one of the guards and the boom.

As shown in Fig. 9, the trolley 60 may be suspended. This trolley 60b is suspended from two rails of the auxiliary beam 37b. The lower part of the auxiliary beam 37b is lower than the lower part of the guard 31 and the boom 32, and the rail is provided here.

The above embodiment assumes that the trolley 41 is unloaded between the running surface of the crane 20, but is unloaded between the devices above the driving surface, for example, the height of the deck of the ship S. The same is true of cases.

The technical scope of the present invention is not limited to the description of each claim of the claims or the description of the terms of the composition and operation of the invention, but also to the range readily replaceable by those skilled in the art.

According to the present invention, the range in which the relay trolley travels can be limited, so that the weight can be reduced.

Further, since the pedestal is suspended from the relay trolley by the rope and the rope is inclined, the shaking of the pedestal can be suppressed and the unloading time can be shortened.

Claims (15)

At the end of the guard, it is provided with a boom that rotates between a horizontal state and a standing state, and has three trolleys for driving the girder and the boom, and two at both ends in the driving direction of the three trolleys. The trolley has a hanging tool for hanging a container, the trolley centrally located in the direction of travel has a pedestal for loading a container from each of the two hanging trolleys, the guard and The boom includes a first rail on which the two trolleys travel and a second rail on which the center trolley travels, and the second rail is installed at both positions in a horizontal outward direction than the first rail. The position of the sea end of the second rail is on the land side rather than the position of the sea end of the first rail, and the sea of the first rail The position of the end is the center trolley in which the hanging tool of the said trolley of the sea side located in the sea side is located more than this center trolley, in the state which the said center trolley is located in the position of the sea end of the said 2nd rail. The container crane, characterized in that the position that can be moved up and down than the height position of the pedestal of the. The container crane according to claim 1, wherein the guard is supported by four legs, and the land end of the second rail is between the bridge on the sea side and the bridge on the land side. Two trolleys having a boom that rotates between a horizontal state and a standing state at the end of the guard, and having three trolleys for driving the girder and the boom, and two trolleys positioned at both ends in the driving direction of the three trolleys. Has a hanging tool for hanging a container, the trolley centrally located in the direction of travel has a pedestal for loading a container from each of the hanging tools of the two trolleys; The boom is composed of a first beam driven by the two trolleys and a second beam driven by the central trolley, and the second beam is located at both horizontally outward positions than the first beam. And the position of the sea end of the second beam is located on the land side rather than the position of the sea end of the first beam. The position of the sea end of the first beam is at the position of the sea end of the second beam, with the center trolley positioned above the suspension of the sea side trolley located at the sea side than the center trolley. A container crane, characterized in that the tool is capable of lifting up and down in a direction above and below the height of the pedestal of the center trolley. 4. The container crane according to claim 3, wherein the guard is supported by four legs, and the land end of the second beam is between the sea side bridge and the land side bridge. A girder supported by four legs, a boom connected to the end of the girder and protruding horizontally in use, a first tension bar connecting the boom and the top of the mast positioned above the leg; It consists of a second tension bar connecting the boom of the guard and the upper end of the mast than the connection point of the first tension boom and the mast, and three trolleys for driving the guard and the boom, the traveling of the three trolleys The two trolleys at both ends in the direction are provided with a hanging tool for hanging the container, and in the driving direction, the central trolley has a pedestal for loading containers from each of the hanging tools of the two trolleys. Wherein each of the hanging tools of the two trolleys can be positioned above the pedestal, the guard and the boom being described above. A first rail on which two trolleys travel, and a second rail on which the center trolley travels, wherein the second rail is provided at both positions in a horizontal outward direction than the first rail; The position of the sea end of the second rail is a container crane, characterized in that the position on the basis of the connection point of the second tension bar and the boom. 6. A container crane as claimed in claim 5, wherein the land end of the second rail is between the bridge on the sea side and the bridge on the land side. The method of claim 5, wherein the girder and the boom comprises a first beam having the first rail and the second beam having the second rail, wherein the second beam of the first beam It is fixed to the side, wherein the sea end of the second beam is a container crane, characterized in that the position on the basis of the connection point between the second tension bar and the boom. 8. The container crane of claim 7, wherein the land end of the second beam is between the bridge on the sea side and the bridge on the land side. Three trolleys running substantially one guard, and in the driving direction of the three trolleys, two trolleys at both ends are provided with a hanging tool for hanging a container, and in the driving direction, The trolley has a pedestal for carrying a container from each hanging tool of the two trolleys, the central trolley suspending the pedestal with a plurality of ropes, the center trolley and the pedestal The rope between the container crane, characterized in that inclined with respect to the vertical line. The trolley according to claim 9, wherein the rope between the central trolley and the pedestal is fixed to the pedestal and is viewed from a horizontal direction perpendicular to the traveling direction of the center trolley. Wherein said rope between said pedestals is inclined with respect to a vertical line. 10. The method according to claim 9, wherein when viewed in a horizontal direction perpendicular to the traveling direction of the center trolley, there are four ropes between the center trolley and the pedestal, and the angle to the vertical line is the same. Container crane characterized in that. 12. The vehicle according to claim 11, wherein the rope between the central trolley and the pedestal has two ends at each end of the pedestal when viewed from the running direction of the center trolley. Inclined toward one side, the other inclined inward, and each of these inclination angles is the same. 10. The rope according to claim 9, wherein the rope between the central trolley and the pedestal is fixed to the pedestal, and viewed from the running direction of the central trolley, the rope between the central trolley and the pedestal. Container container, characterized in that inclined with respect to the vertical line. At the end of the guider is provided with a boom that rotates between a horizontal state and a standing state, provided with the trolley and three trolleys for driving the boom, and two located at both ends in the driving direction of the three trolleys The trolley has a hanging tool for hanging a container, and the trolley located in the center in the driving direction has a pedestal for loading a container from each of the hanging tools of the two trolleys. The trolley of the suspension is suspended by the rope, the guard and the boom has a first rail for the two trolleys, a second rail and a third rail for the central trolley, The first, second and third rails are provided below the pins connecting the guards and the booms, and the second rails are located above the guards and the booms. It is installed in, the trolley of the center is loaded, wherein the third rail is installed on the lower side of the side of the girder and the boom, the container characterized in that the side of the lower side of the center trolley contact crane. Three trolleys running substantially one guard, two trolleys at both ends in the driving direction of the three trolleys with a hanging tool for hanging containers, and a central trolley in the driving direction And a pedestal for loading a container from each of the hanging tools of the two trolleys, wherein the central trolley is suspended with a rope to lower the pedestal to the ground.