JP6393954B2 - Crane overhead structure system and crane manufacturing method - Google Patents

Description

The present invention is related to on creel system and a manufacturing method of the crane on the rack structure of the crane.

  To manufacture large leg cranes such as quay cranes, mobile jib cranes, unloader cranes, and low profile cranes used in harbors such as container terminals, booms, masts, girders, trolleys, and machine rooms on the ground Are assembled, and the upper structure is overlaid on the upper end portion of the leg structure having legs and joined to the leg structure. However, since this overhead structure has several hundred tons to over 1,000 tons, it is not easy to lift this weight safely.

  In this regard, a floating crane having a lifting capacity of 1,000 tons class is used to lift the overhead structure and join with the leg structure, or a separate overhead structure for lifting the overhead structure is installed. A lifting device such as a center hole jack is installed in the upper four corners of the structure, and the upper structure is overlaid by a lifting tool to which a chain or guide rod that is pulled up by the lifting device is connected, and joined to the leg structure. A method has been proposed.

  However, the floating crane method lifts offshore structures from the sea, and is easily affected by the weather including waves on the sea, making positioning difficult when joining the upper structure and leg structure difficult. The nature was high.

  On the other hand, in the method using the upper structure, it is necessary to secure a space for reinforcing the ground for providing the upper structure. In addition, when the lifting device is installed on the upper structure, when the weight of the upper structure becomes heavy, the lifting device needs to be enlarged. It was necessary to reinforce the overhead structure due to the increase in weight.

  In view of this, a method has been proposed in which the upper structure is integrally mounted using the leg structure (see, for example, Patent Document 1).

  This method uses a leg structure and does not require a floating crane or an overhead structure. However, it is necessary to assemble a completed crane at the transport source and transport the completed crane on a transport ship. It is assumed.

  However, since the completed crane has a high center of gravity, if the completed crane is to be transported by a transport ship, the center of gravity of the transport ship becomes high. Therefore, if the number of completed cranes that can be simultaneously transported is increased, the position of the center of gravity of the transport ship becomes high, and it becomes impossible to secure the restoring force of the swinging transport ship, which may cause the transport ship to overturn. This can be achieved by reducing the number of completed cranes that are simultaneously transported by a single transport ship and lowering the center of gravity of the transport ship, or by using a larger transport ship to increase the buoyancy of the transport ship. However, these methods increase the transportation cost.

  In addition, when a lifting device such as a center hole jack is used as a device for lifting the upper structure, when the weight of the upper structure becomes heavy, it is necessary to enlarge the lifting device. In addition, since the weight of the apparatus increases as the size of the apparatus increases, the structure in which the lifting device is provided on the upper part of the leg structure needs to reinforce the leg structure. In addition, the upper structure is pulled up by the chain or guide rod. However, if the weight of the upper structure increases, the chain or guide rod needs to be strengthened, and the weight of the chain or guide rod itself also increases.

  Therefore, depending on the weight of the upper structure, the lifting device increases in size and the weight associated with the increase in the size increases the cost of manufacturing the crane, and the increased size of the lifting device in the leg structure. The work to attach to becomes difficult.

  Furthermore, the chain and the guide rod are difficult to handle, and there is a problem that it is difficult to accommodate and attach them. For example, in the case of a chain, the winding direction is limited, so that it cannot be wound up, and it is difficult to attach to a pulling device.

JP-A-53-136254

  The present invention has been made in view of the above-mentioned problems, and the problem is that the crane can be assembled with the overhead structure of the crane regardless of the location, and the manufacturing cost and the transportation cost can be reduced. The present invention is to provide a crane manufacturing method and an optimum crane overhead structure system used in the manufacturing method.

In order to solve the above problems, the crane overhead structure system according to the present invention has a boom structure in which a trolley traverses and an overhead structure having a girder are joined to an upper end portion of a leg structure having a plurality of legs. When the crane is manufactured, in the overhead structure of the crane for overhanging the overhead structure on the upper end portion of the leg structure, the crane has the same number of overhead devices as the number of the legs. A combined pulley including at least one fixed pulley and at least one moving pulley, a steel cable wound around the combined pulley, a winding device for winding the steel cable, and a lower end portion of the leg structure supported by the legs A winding device bracket that is fixed to a lower end portion of the leg on the lower side of the upper structure that is temporarily fixed and configured separately from the leg structure, and the fixed pulley is the Top of leg Is fixed to the movable pulley is fixed on said rack structure that is temporarily fixed, one end of said steel ropes is fixed to an upper end portion of the leg, the winding device than the upper rack structure that is temporarily fixed It is the structure fixed to the said bracket for winding devices in the position of a downward side, It is characterized by the above-mentioned.

And the manufacturing method of the crane of this invention for solving said subject uses a trolley at the upper end part of the leg structure which has several legs using the above- mentioned crane overhead structure system of a crane. In the method of manufacturing a crane for overhanging and joining an upper structure having a traverse boom and a girder, the leg structure of the upper structure that is supported and temporarily fixed in advance at the lower end of the leg structure at a transport destination When the temporary fixing to the body is released and the upper structure is lifted, the leg structure in the state of being erected by using the upper system is used as a support that bears the weight of the upper structure. The upper structure is overlaid on the upper end portion of the leg structure and is joined to the leg structure.

  According to the crane manufacturing method and the overhead system of the present invention, since the overhead structure temporarily fixed to the lower end portion of the leg structure is elevated using the leg structure, a floating crane, an overhead structure, or the like is used. Therefore, the upper structure can be elevated regardless of the place.

Therefore, it can be transported with the pre-uplift structure having a lower center of gravity than the completed crane, and the upper structure can be elevated at the transport destination. As a result, the position of the center of gravity of the transport ship can be lowered when transporting with a transport ship, so the number of units transported simultaneously by one transport ship can be increased without using a large transport ship. Transportation costs can be greatly reduced.

  Even if the weight of the upper structure increases, it is possible to avoid the increase in the size of the device, the increase in weight due to the increase in the size of the device, and the difficulty of installation and removal work. The combination pulley, the steel cable, and the winding device can be easily attached and removed regardless of the location. Thereby, manufacturing cost can be reduced.

It is the figure which showed the state which assembled the overhead structure of the crane in embodiment of the manufacturing method of the crane of this invention. It is the arrow view seen from the arrow II direction of FIG. The state which attached the embodiment of the overhead system of this invention to the crane of the state of FIG. 1 is shown. It is the arrow line view seen from the arrow IV direction of FIG. FIG. 4 is a diagram showing a state in which an upper structure is overlaid from the state of FIG. 3. It is the arrow view seen from the arrow VI direction of FIG. It is the figure which showed the combination pulley of the overhead apparatus shown in FIG. 1, (a) shows the case where the number of hooks of a steel cord is four, (b) shows the case where the number of hooks of a steel cord is eight. It is the figure which showed an example of the state which transports a crane in embodiment of the manufacturing method of the crane of this invention. It is the figure which showed the state in which the transport ship inclined during the transport shown in FIG. In embodiment of the manufacturing method of the crane of this invention, it is the figure which showed the other example of the state which transports a crane.

  Hereinafter, a crane manufacturing method of the present invention and a crane overhead structure used in the manufacturing method will be described based on the embodiments illustrated in the drawings. In the following description, the crane overhead structure is temporarily fixed to the lower end of the leg structure, the pre-overhead structure 1A, the crane overhead structure is overlaid, and the leg structure and the overhead structure are joined. The state is a completed crane 1B. In FIG. 7A, the fixed pulleys are 32A to 32C and the dynamic pulleys are 33A and 33B. In FIG. 7B, the constant pulleys are 32A to 32E and the dynamic pulleys are 33A to 33D. In the following description, reference numeral 32 is used to indicate each fixed pulley, and reference numeral 33 is used to indicate each moving pulley.

  In this embodiment of the crane manufacturing method, first, as shown in FIGS. 1 and 2, the pre-overhead structure 1 </ b> A including the leg structure 10 and the upper structure 20 is assembled at the transportation source, and the leg structure 10. The upper structure 20 is temporarily fixed to the lower end. Next, as shown in FIGS. 3 and 4, the overhead system 30 is attached to the structure 1 </ b> A before the overhead, and the structure 1 </ b> A before the overhead is transported by the transport ship 2 as shown in FIG. 8. Next, as shown in FIG. 5 and FIG. 6, in the transport destination, the upper structure 20 is overlaid on the upper side of the leg structure 10 by the upper system 30 using the leg structure 10 and joined. .

  Therefore, first, the pre-overhead structure 1A will be described with reference to FIG. 1 and FIG. The pre-uplift structure 1A includes a leg structure 10 and an upper structure 20 that is supported and temporarily fixed to the lower end of the leg structure 10.

The leg structure 10 includes two sea-side legs 11a arranged on the sea side and two land-side legs 11b arranged on the land side when the crane 1B is used, and includes the sea-side legs 11a and the land-side legs 11b. Each is provided with a traveling device 12. The leg structure 10 also includes a sill beam 13 that connects the sea-side legs 11a and the land-side legs 11b, and a portal tie beam 14 that connects the opposing sea-side legs 11a and the land-side legs 11b. ing. In addition, the leg structure 10 includes a first tie beam member (upper beam member) 15 serving as a joint portion with the upper structure 20 at the upper end of each leg 11a, 11b.

  The upper structure 20 includes a boom 22 and a girder 23 in which a trolley 21 having a hanging tool traverses, and a mast 24, a tension bar 25, a back stay 26, and a machine room 27. The machine room 27 includes a hanger. A hoisting device, a traversing device for the trolley 21 and a hoisting device for the boom 22 are provided. The upper structure 20 includes a second tie beam member (upper beam member) 28 that serves as a joint portion with the leg structure 10. In addition, the upper structure 20 has a width of the mast 24 in the traveling direction of the traveling device 12, as shown in FIG. 2, between the sea-side legs 11a (between the land-side legs 11b). It is formed narrower than the width.

  As shown in FIGS. 5 and 6, a tie beam 29 is formed when the first tie beam member 15 of the leg structure and the second tie beam member 28 of the upper structure are joined and integrated.

  As shown in FIG. 1, the pre-overhead structure 1 </ b> A includes a lifting member 40 that supports the upper structure 20 from below and a bracket (supporting member) 16 that supports the lifting member 40.

  The bracket 16 is provided on each of the sea-side legs 11a and each of the land-side legs 11b of the leg structure 10, and at the lower end of the leg structure 10, and between the sea-side legs 11a and between the land-side legs 11b. A bracket that directly or indirectly supports the upper structure 20 therebetween. In this embodiment, the upper structure 20 is indirectly supported with the lifting member 40 interposed.

  The bracket 16 is fixed to the legs 11a and 11b so as to support the lower end surface of the upper structure 20 at a height h1 from the ground. In order to manufacture the upper structure 20 at a temporarily fixed position at the transportation source, if the height h1 is reduced, the upper structure 20 can be assembled closer to the ground.

  Next, the overhead system 30 of the present invention illustrated in FIGS. 3 and 4 attached to the pre-overhead structure 1A is positioned at the four corners of the leg structure 10 when the leg structure 10 is viewed from above. Elevator 31A-31D is provided.

  As shown in FIG. 7, each of the upper suspension devices 31 </ b> A to 31 </ b> D includes a combination pulley 34 including a fixed pulley 32 and a moving pulley 33.

  Further, as shown in FIGS. 3 and 4, each of the overhead devices 31 </ b> A to 31 </ b> D includes a wire rope 35 wound around the combination pulley 34, a winding device 36 that winds the wire rope 35, and a constant pulley 32. An upper sheave block 37 and a lower sheave block 38 having a moving pulley 33 paired with a fixed pulley 32 are provided.

  The fixed pulley 32 is provided so as to be attachable to and detachable from the upper sheave block 37, and is fixed to the upper ends of the legs 11 a and 11 b via the upper sheave block 37. The upper sheave block 37 is fixed to be attachable and detachable.

When the upper sheave block 37 having the fixed pulley 32 is fixed to the upper ends of the legs 11a and 11b, the load of the upper structure 20 applied to the fixed pulley 32 is the vertical direction of the legs 11a and 11b. Acts in the (longitudinal direction of the leg). Accordingly, it is possible to avoid an excessive load from being generated on each beam of the leg structure 10, so that the upper structure 20 can be overlaid without specially reinforcing the leg structure 10.

  The movable pulley 33 is provided so as to be attachable to and detachable from the lower sheave block 38, and is attached to the upper structure 20 temporarily fixed to the lower end portion of the leg structure 10 via the lower sheave block 38 and the lifting member 40. It is fixed. The lower sheave block 38 is fixed to be attachable and detachable.

  The lower sheave block 38 having the movable pulley 33 is fixed to the end portion of the lifting member 40 so as to be disposed at the four corners of the leg structure 10 when the leg structure 10 is viewed from above. The end of the lifting member 40 can be pulled up.

  Further, as described above, the fixed pulley 32 is fixed via the upper sheave block 37 and the movable pulley 33 is fixed via the lower sheave block 38, so that each of the fixed pulley 32 and the movable pulley 33 is directly fixed. Thus, it can be more easily attached to or removed from the pre-overhead structure 1A.

  The fixed pulley 32 and the movable pulley 33 increase or decrease the number of the upper sheave blocks 37 and the lower sheave blocks 38 according to the weight of the upper structure 20 to increase or decrease the number of the wire ropes 35 to be hung. It is configured.

  For example, as shown in FIG. 7A, when the number of wire ropes 35 of the pair of upper sheave block 37 and the lower sheave block 38 is four, the upper sheave block 37 has fixed pulleys 32A to 32C. The movable sheaves 33A and 33B are provided on the lower sheave block 38. Thereby, the lifting capacity of each of the overhead devices 31 </ b> A to 31 </ b> D is four times the tension of the wire rope 35.

  Further, as shown in FIG. 7B, when the number of the wire ropes 35 of the pair of upper sheave block 37 and lower sheave block 38 is eight, fixed sheaves 32A to 32E are attached to the upper sheave block 37. The movable sheaves 33A to 33D are provided on the lower sheave block 38. Thereby, the lifting ability of each of the overhead devices 31 </ b> A to 31 </ b> D is eight times the tension of the wire rope 35.

  As described above, when the weight of the upper structure 20 is increased by adjusting the number of the fixed pulleys 32 and the movable pulleys 33 so that the number of the wire ropes 35 depending on the weight of the upper structure 20 is adjusted. In addition, the upper structure 20 can be mounted without increasing the size of the winding device 36.

  It should be noted that the number of wire ropes 35 of the upper devices 31 </ b> A to 31 </ b> D may be different for each of the upper devices 31 </ b> A to 31 </ b> D depending on the position of the center of gravity of the upper structure 20.

  The wire rope 35 is formed by twisting strands to form a strand, and twisting the strand around a cord. The wire rope 35 has one end 35 a fixed to the upper sheave block 37, the other end fixed to the winding device 36, and wound around the combination pulley 34. This wire rope 35 is lighter and more flexible than chains and guide rods used in conventional overhead methods. Therefore, operations such as tidying up can be performed easily and quickly. In addition, since it does not take up storage space compared to chains and guide rods, it is also suitable for transportation.

The winding device 36 is a device that winds the wire rope 35, and includes a wire drum 36a, a speed reducer 36b, and a motor 36c, as shown in FIG.

  The winding device 36 is wound at the lower end of each leg 11a, 11b, preferably at a position below the temporarily fixed upper structure 20, that is, at a height equivalent to the sill beam 13 in this embodiment. It is fixed to each leg 11a, 11b by the bracket 39 for a taking device. By fixing the winding device 36 below the temporarily fixed upper structure 20, the load when the upper structure 20 is elevated can be distributed not only to the upper part of each leg 11a and 11b but also to the lower part. Therefore, it is not necessary to reinforce the leg structure 10 in excess.

  Next, the manufacturing method of the crane 1B of this invention is demonstrated.

  First, as shown in FIGS. 1 and 2, the leg structure 10 is assembled, and the bracket 16 is joined to each of the legs 11 a and 1 b of the leg structure 10. Next, the lifting member 40 is hung on the bracket 16. Next, the upper structure 20 is assembled so as to be supported by the bracket 16 and the lifting member 40, and the upper structure 20 is temporarily fixed to the lower end portion of the leg structure 10 to construct the pre-uplift structure 1 </ b> A.

  Next, as shown in FIGS. 3 and 4, the overhead devices 31 </ b> A to 31 </ b> D of the overhead system 30 are positioned at the four corners of the leg structure 10 when the leg structure 10 is viewed from above. Position and install. Specifically, the upper sheave block 37 of each of the overhead devices 31 </ b> A to 31 </ b> D is fixed to the four upper ends of the legs 11 a and 11 b of the leg structure 10. Further, the lower sheave block 38 is fixed to the four ends of the two lifting members 40. Further, the winding device bracket 39 is fixed to the four legs 11a and 11b of the legs 11a and 11b, and the winding device 36 is installed on the winding device bracket 39. Then, the wire rope 35 is fed out from the wire drum 36 a of the winding device 36, wound around the combination pulley 34, and the end portion 35 a of each wire rope 35 is fixed to each upper sheave block 37.

  Next, the pre-uplift structure 1A to which the upper system 30 is attached is placed on the transport ship 2 as shown in FIG. At this time, the pre-overhead structure 1A in which the leg structure 10 and the upper structure 20 are integrated by the bracket 16 and the lifting member 40 is caused to travel on the track provided on the transport ship 2 from the quay by each traveling device 12. And put it on the transport ship 2. The pre-overhead structure 1 </ b> A is loaded with the direction in which the upper structure 20 projects over the width direction of the transport ship 2, and a plurality of pre-overhead structures 1 </ b> A are placed side by side in the front-rear direction of the transport ship 2.

  Here, FIG. 8 will be described. In FIG. 8, the center of gravity of the structure 1A before the overhead is Gc, the center of gravity of the completed crane 1B is Gc ', the center of gravity of the transport ship 2 when the structure 1A is mounted is Gs, the floating center is Bs, and the metacenter is Ms and the center of gravity of the transport ship 2 when the crane 1B is mounted are defined as Gs ′. Moreover, it describes as the case where the same number of pre-uplift structures 1A and cranes 1B are mounted on the transport ship 2.

  It can be seen from FIG. 8 that the center of gravity Gc of the pre-overhead structure 1A is lower than the center of gravity Gc 'of the crane 1B. In addition, when the same number of the pre-uplift structure 1A and the crane 1B are mounted on the transport ship 2, the center of gravity Gs of the transport ship 2 on which the pre-uplift structure 1A is mounted is the center of gravity Gs of the transport ship 2 on which the crane 1B is mounted. It turns out that it is lower than '.

  Next, in the same manner as when the pre-overhead structure 1A transported to the transport destination is placed on the transport ship 2, it is lowered from the transport ship 2. And it moves to the place which performs the overhead work of the upper structure 20, and the temporary fixation with respect to the leg structure 10 of the upper structure 20 is cancelled | released.

Next, as shown in FIGS. 5 and 6, the motor 36 c of the winding device 36 is driven to drive the wire drum 36 a to wind the wire rope 35. When the wire rope 35 is wound around the wire drum 36a, the movable sheave 33 of the combination pulley 34 is pulled upward, and the lower sheave block 38 is pulled upward. Therefore, the upper structure 20 supported by each lower sheave block 38 and each lifting member 40 is pulled up to the upper side of the leg structure 10. Accordingly, the upper structure 20 is overlaid on the upper end portion of the leg structure 10 by using the leg structure 10 as a support that bears the weight of the upper structure 20.

  When the upper structure 20 is raised, unless the upper structure 20 is lifted evenly by the upper devices 31 </ b> A to 31 </ b> D, the lifting force is not equalized and a force for twisting the upper structure 20 is generated. Therefore, when the overhead structure 20 is lifted by a plurality of the overhead devices 31A to 31D, the heights of the overhead devices 31A to 31D wound up the overhead structure 20 are detected, and the difference in height between them is minimized. As described above, each winding device 36 of each of the overhead devices 31A to 31D is feedback-controlled. Thereby, each of the upper suspension devices 31 </ b> A to 31 </ b> D can evenly lift the upper structure 20, and it can be avoided that a force for twisting the upper structure 20 is generated.

  Next, the first tie beam member 15 and the second tie beam member 28 are joined together by aligning the position of the first tie beam member 15 of the leg structure 10 and the position of the second tie beam member 28 of the upper structure 20. As a result, the tie beam 29 is formed.

  Next, the lifting member 40 fixed to the upper structure 20 is removed and the lifting member 40 is suspended, and then each of the lifting devices 31A to 31D is removed from the crane 1B. And the bracket 16 is removed from each leg 11a and 11b, and the manufacturing method of the crane 1B is completed.

  When the pre-overhead structure 1A is transported by the transport ship 2, it is necessary to adjust the height h1 of the lower end surface of the upper structure 20 shown in FIG.

  As shown in FIG. 9, the height h1 is a position where the part of the upper structure 20 that protrudes above the sea does not contact the sea surface when the transport ship 2 is tilted within the range where the restoring force of the transport ship 2 works. Is set to be

  The restoring force of the transport ship 2 is determined by the relationship between the center of gravity Gs, the line of action of the buoyancy Bs, and the metacenter Ms at the intersection of the center line of the hull, and is within the range where the restoring force of the transport ship 2 of this embodiment works. The inclination is defined as 30 to 40 degrees. Therefore, the height h1 that supports the upper structure 20 is set to a height at which the portion of the upper structure 20 that protrudes above the sea does not contact the sea surface even when the transport ship 2 is inclined at 30 to 40 degrees. The

  In FIG. 9, the pre-overhead structure 1 </ b> A ′ that supports the upper structure 20 at a position lower than the height h <b> 1 is a dotted line, and the pre-overhead structure 1 </ b> A that supports the upper structure 20 at the height h <b> 1 is a solid line. Further, the inclination θ of the transport ship 2 in FIG. 9 is about 20 degrees.

  In the pre-overhead structure 1A ′ that supports the upper structure 20 at a position lower than the height h1, when the transport ship 2 is inclined at an inclination θ, the portion of the upper structure 20 that protrudes above the sea contacts the sea surface. End up. At this time, the tip of the boom 22 of the upper structure 20 is deformed or damaged due to strong resistance. On the other hand, in the pre-overhead structure 1A that supports the upper structure 20 at the position of the height h1, even if the transport ship 2 is inclined by the inclination θ, the portion protruding to the sea does not contact the sea surface.

Therefore, when the transport ship 2 is tilted within the range where the restoring force is applied, the upper structure 20 is moved by the bracket 16 and the lifting member 40 at a position where the protruding portion of the upper structure 20 is not in contact with the sea surface. By supporting and temporarily fixing, deformation and breakage of the overhead structure 20 during transportation can be avoided. Moreover, even when the transport ship 2 does not tilt, the rate at which the upper structure 20 is subjected to waves can be reduced.

  According to the manufacturing method of the crane 1B and the overhead system 30 of the overhead structure 20 of the crane 1B, as shown in FIGS. 1 and 2, the overhead structure 20 is attached to the brackets 16 provided on the legs 11a and 11b. The suspension member 40 fixed to the upper structure 20 is supported and temporarily fixed below the leg structure 10 and between the sea-side legs 11a and the land-side legs 11b. Can be assembled. Thereby, the safety | security of the operation | work which assembles the upper structure 20 is securable.

  In addition, by supporting the upper structure 20 with the bracket 16 and the lifting member 40 and temporarily fixing the upper structure 1 </ b> A in a state in which the upper structure 20 is temporarily fixed to the lower end portion of the leg structure 10. It can be easily moved by each traveling device 12 of the leg structure 10. Thereby, since the crane 1B can be manufactured regardless of a place without limiting the place where the upper structure 20 is overlaid, as shown in FIG. The crane 1B can be assembled with the upper structure 20 being lifted at the transportation destination.

  In addition, as shown in FIGS. 5 and 6, when the upper structure 20 is overlaid above the leg structure 10, the upper structure 20 is used by using the upper devices 31 </ b> A to 31 </ b> D having the combination pulleys 34. Is increased, the number of the fixed pulleys 32 and the movable pulleys 33 is increased, and the number of the wire ropes 35 wound around the combination pulley 34 is increased. Can be mounted without increasing the size. Further, the upper structure 20 can be overlaid by the wire rope 35 that is lighter and more flexible than conventional chains and guide rods. Accordingly, each of the overhead devices 31A to 31D can be reduced in size, and each of the overhead devices 31A to 31D can be easily attached to the leg structure 10 and the overhead structure 20, so that the overhead structure 20 can be overlaid. Can be done anywhere.

  For the above reason, according to the method for manufacturing the crane 1B, the upper structure 20 is elevated using the leg structure 10, so that a floating crane, an upper structure, or the like is not used. The upper structure 20 can be overlaid without the need.

  Therefore, it can be transported as it is in the pre-uplifting structure 1A whose position of the center of gravity is lower than that of the completed crane 1B, and the upper structure 20 can be elevated at the transport destination. Thereby, when transporting with the transport ship 2, the position of the center of gravity Gs of the transport ship 2 can be lowered, so that a large number of the transport ship 2 can be transported simultaneously without using a large transport ship. This can greatly reduce the transportation cost.

  In addition, according to the method for manufacturing the crane 1B and the overhead system 30 of the overhead structure 20 of the crane 1B, even if the weight of the overhead structure 20 increases, the size of the apparatus increases and the weight associated with the increase in the size of the apparatus. And the difficulty of attaching and removing operations can be avoided, so that the combination pulley 34, the wire rope 35, and the winding device 36 can be attached to and removed from any place such as the transportation source and the transportation destination. It can be done easily. Thereby, manufacturing cost can be reduced.

  In the above embodiment, a quay crane used in a harbor such as a container terminal has been described as an example. However, the present invention is not limited to this, for example, a mobile jib crane, an unloader crane, and a low profile. It can be applied to large leg cranes such as cranes.

In the above embodiment, the trolley 21, the boom 22, the girder 23, the mast 24, the tension bar 25, the back stay 26, and the upper structure 20 provided with the machine room 27 have been described as an example. This changes the configuration.

  Further, in the above embodiment, an example of a configuration in which the pre-overhead structure 1A temporarily fixes the upper structure 20 by the brackets 16 provided on the legs 11a and 11b and the lifting member 40 fixed to the upper structure 20 is an example. However, the present invention is not limited to this. For example, the upper structure 20 may be directly supported by the bracket 16. In this case, the lower sheave block 38 is fixed so as to support the end portion of the second tie beam member 28 of the upper structure 20 from below. As described above, when the upper structure 20 is directly supported by the bracket 16, the number of members can be reduced as compared with the case of the above-described embodiment, and the upper structure 20 is elevated. There is no need to hang the lifting member 40 later. On the other hand, in the case of the above-described embodiment, compared to the case where the upper structure 20 is directly supported by the bracket 16, the stability when the upper structure 20 is elevated can be improved.

  Moreover, the combination pulley 34 of each of the overhead devices 31A to 31D in the above embodiment is an example, and the present invention is not limited to this. For example, it may be a combination pulley composed of a fixed pulley and two moving pulleys, and the other moving pulley may be pulled up by the fixed pulley and one moving pulley.

  In the above embodiment, the transport system 2 is transported with the overhead system 30 attached to the pre-overhead structure 1A. However, as shown in FIG. 10, the overhead system 30 is not attached to the pre-overhead structure 1A. It can also be transported by. In this case, as shown in FIG. 3 and FIG. 4, the overhead structure 30 is attached to the pre-overhead structure 1 </ b> A at the transportation destination, and the temporarily fixed upper structure 20 is overlaid. By transporting the pre-overhead structure 1A without attaching the overhead system 30, the center of gravity Gs of the transport ship 2 can be lowered as compared with FIG. 8 when the overhead system 30 is attached.

  In the above embodiment, the manufacturing method for transporting the pre-overhead structure 1A with a transport ship and overlaying the top structure 20 temporarily fixed at the transport destination has been described as an example. 20 to the position where the leg structure 10 is permanently fixed, the completed crane 1B is assembled, the operation is checked, etc., and then the leg structure 10 and the upper structure 20 are disassembled again before The structure 1A can also be transported.

DESCRIPTION OF SYMBOLS 1A Prior structure 1B Crane 2 Transport ship 10 Leg structure 11a, 11b Leg 12 Traveling device 13 Sill beam 14 Portal tie beam 15 First tie beam member 16 Bracket 20 Overlay structure 21 Trolley 22 Boom 23 Girder 24 Mast 28 Second tie beam Member 29 Tie beam 30 Elevating system 31A-31D Elevating device 32 Fixed pulley 33 Moving pulley 34 Combination pulley 35 Wire rope 36 Winding device 37 Upper sheave block 38 Lower sheave block 39 Winding device bracket 40 Lifting member

Claims (4)

When manufacturing a crane in which an upper structure having a boom and a girder that traverses a trolley is joined to an upper end of a leg structure having a plurality of legs, the upper structure is mounted on the upper end of the leg structure. In the overhead system of the crane overhead structure
Having the same number of lifting devices as the number of legs,
A combination pulley including at least one fixed pulley and at least one moving pulley, a steel cable wound around the combination pulley, a winding device for winding the steel cable, and a lower end portion of the leg structure. A bracket for a winding device, which is fixed to a lower end portion of the leg below the upper structure supported and temporarily fixed by the leg and configured separately from the leg structure,
The fixed pulley is fixed to the upper end portion of the leg, the movable pulley is fixed to the upper frame structure temporarily fixed, one end portion of the steel cable is fixed to the upper end portion of the leg, and the winding device is temporarily An overhead system for an overhead structure of a crane, characterized in that the overhead structure is fixed to the bracket for the winding device at a position below the fixed overhead structure.   The upper device includes an upper pulley body having a plurality of the fixed pulleys and a lower pulley body having a plurality of the movable pulleys paired with each of the fixed pulleys, and the upper pulley body is at an upper end portion of the leg. 2. The crane overhead structure according to claim 1, wherein the lower pulley body is fixed to the upper structure, and one end portion of the steel cable is fixed to an upper end portion of the leg via the upper pulley body. Overhead system.   The fixed pulley and the movable pulley are configured to be detachable from the upper pulley body and the lower pulley body, respectively, and the number of hooks of the steel cord is adjusted according to the weight of the upper structure. The overhead structure of the described crane overhead structure. The overhead structure which has the boom and girder which a trolley traverses to the upper end part of the leg structure which has several legs using the overhead system of the overhead structure of the crane of any one of Claims 1-3 In the manufacturing method of the crane that
At the transport destination, when the upper structure that is supported and temporarily fixed in advance at the lower end of the leg structure is released from the temporary fixing to the leg structure, and the upper structure is overlaid, The leg structure in a state of being erected by using the leg structure as a support that bears the weight of the upper structure, the upper structure is overlaid on the upper end of the leg structure, and the leg structure A method for manufacturing a crane, characterized in that it is joined to a crane.