JP6166940B2 - Lifting method and lifting assist device using crane - Google Patents

Description

  The present invention relates to a lifting method and a lifting auxiliary device using a crane, and more specifically, without performing a complicated operation, suppressing the swing of the lifting tool at the lower end of the hanging wire suspended from the crane hook, The present invention relates to a lifting method using a crane and a lifting assist device that can safely attach the lifting tool to a suspended load.

  When lifting a suspended load such as a pile to be driven using a crane, a suspension wire having a hanging tool such as a shackle at the lower end is used. The suspension wire is suspended from a crane hook. When the suspension load is suspended, the suspension wire is gradually moved downward by feeding the crane wire and is finally attached to the suspension load by an operator. After the lifting tool is attached to the suspended load, the suspended load is lifted and moved to a target location by winding the crane wire.

  Thus, when it is going to attach a lifting tool to a suspended load, the crane wire and the suspension wire are not a little swung due to the movement of the crane (boom) and the influence of the wind. Therefore, the swinging tool located at the lowermost end has the largest swing width. When the swinging of the hanging tool is large, it becomes difficult for the worker to safely attach the hanging tool to the suspended load. In particular, in the case of a lifting work by an onboard crane, a vibration due to a wave is added, so that the vibration becomes more complicated and it is difficult to ensure the safety of the operator. And in order to ensure safety, it has to work more carefully, and there also arises a problem that the work time increases and the construction period becomes longer than planned.

  Various methods and devices for controlling the suspension operation by the crane device have been proposed (see, for example, Patent Document 1). In Patent Document 1, the target horizontal distance and the target boom tip height from the vertical metacenter to the boom tip are obtained, and the boom undulation angle during the suspension operation is adjusted so as to maintain the target horizontal distance, and the target boom tip height is adjusted. By adjusting the hoisting speed of the suspended load so as to maintain the above, it is possible to effectively suppress the shaking of the ship and the swinging of the suspended load. However, as proposed above, the conventional method, such as adjusting the hoisting angle of the boom and adjusting the lifting speed of the suspended load, has to adjust a plurality of operations at the same time, requiring complicated operations. Met. Along with this, there is a problem that the apparatus tends to be large.

JP 2001-335284 A

  An object of the present invention is to suppress a swing of a suspension device at a lower end portion of a suspension wire suspended from a crane hook without using a complicated operation, and to safely attach the suspension device to a suspended load. It is an object to provide a lifting method and a lifting assisting device using the above.

In order to achieve the above object, the lifting method using the crane of the present invention is such that after the suspension device at the lower end of the suspension wire suspended from the crane hook is attached to the suspension load, the suspension load attached with this suspension device is removed from the crane. In the lifting method using the crane that is lifted by the above-described lifting device, a lifting assist device for feeding and winding the length adjusting rope is suspended from the crane hook, and the length adjusting rope is connected and fixed to the hanging wire, Is attached to a suspended load, the distance between the crane hook and the lifting device is reduced by extending or winding the length adjusting cord by the lifting assist device so that the swinging of the lifting device is reduced. After adjusting and attaching the lifting tool to the suspended load, the weight of the suspended load lifted when the suspended load is lifted by the crane is adjusted to the length. Until a length that does not act on, by the lifting aid, it said to decremental length adjusting rope, and performs the feeding and the winding of said length adjusting search by the lifting aid by wireless operation .
In the lifting method using another crane of the present invention, the lifting device at the lower end of the suspension wire suspended from the crane hook is attached to the suspended load, and then the suspended load attached with the lifting device is lifted by the crane. In the lifting method using a crane, a lifting assist device for feeding and winding the length adjustment cord is suspended from the crane hook, and the length adjustment cord is connected and fixed to the suspension wire. The connecting portion for connecting and fixing the suspension wire to the suspension wire is provided with a safety mechanism for releasing the connection and fixing to the suspension wire when a preset limit load acts on the length adjusting cord, and the suspension tool is used as a suspension load. When installing, the lifting assist device extends or winds up the length adjusting cord so that the swing of the lifting device is reduced. After the distance between the hook and the suspension is adjusted and the suspension is attached to the suspended load, the length of the suspended load that is lifted when the suspended load is lifted by the crane does not act on the length adjusting cord. The length adjusting cord is fed out by the lifting assist device until it becomes.

The lifting assist device of the present invention is a lifting assist device that feeds and winds up the length adjusting cord in a state of being suspended by a crane hook, and the length adjusting cord has a lifting tool at a lower end portion. Connecting and fixing to a suspension wire suspended from the crane hook, and when the suspension tool is attached to a suspended load, the swing of the suspension tool is reduced by extending or winding the length adjusting cord. After adjusting the distance between the crane hook and the suspension tool and attaching the suspension tool to the suspended load, the weight of the suspended load lifted when the suspended load is lifted by the crane acts on the length adjusting cord. until the length is not, in the structure for feeding the length adjustment cord, a wireless controller that the feeding and operation content of the winding of the length adjusting search for radio transmission, the radio control A receiver provided for receiving the transmission signal from La, based on the operation content from the wireless controller the receiver has received, is characterized in that the configuration in which the feed and take-up of said length adjusting search .
Another lifting assisting device of the present invention is a lifting assisting device that feeds and winds up the length adjusting cord in a state where it is suspended by a crane hook, and the length adjusting cord has a lifting tool at the lower end. A predetermined limit load is applied to the length adjusting cord at a connection portion that is connected and fixed to a hanging wire that is suspended from the crane hook and that connects and fixes the length adjusting cord to the hanging wire. In this case, a safety mechanism for releasing the connection and fixing to the suspension wire is provided, and when the suspension device is attached to a suspended load, the swing of the suspension device is reduced by extending or winding the length adjusting cord. After adjusting the distance between the crane hook and the suspension so that the suspension is attached to the suspended load, the weight of the suspended load lifted when the suspended load is lifted by the crane is the length. Fushisaku until a length that does not act on, characterized in that the arrangement for feeding the length adjustment search.

  According to the present invention, the lifting auxiliary device for feeding and winding the length adjusting cord is suspended from the crane hook, and the length adjusting cord is suspended from the lower end portion suspended from the crane hook. When attaching the hanging tool to the suspended load with the wire connected and fixed, the lifting hook can be used to extend or wind up the length adjustment cord so that the swing of the lifting tool can be reduced. The swinging width of the hanger can be reduced simply by adjusting the distance between the hanger and the hanger. After the lifting tool is attached to the suspended load, the lifting assist device is used to lift the length adjustment cord until the weight of the suspended load that is lifted by the crane becomes a length that does not act on the length adjustment cord. By extending the cable, the length adjustment cord can be made to have a small load resistance. Accordingly, it is very advantageous to reduce the weight and size of the suspension assisting device.

It is explanatory drawing which illustrates the crane which suspended the lifting assistance apparatus of this invention. It is explanatory drawing which expands and illustrates a suspension wire and the lifting auxiliary | assistance apparatus of this invention. It is explanatory drawing which illustrates the state which wound up the length adjustment rope with the lifting auxiliary | assistance apparatus, and shortened the distance of a crane hook and a lifting tool. It is explanatory drawing which illustrates the state which lifts the suspended load with the crane.

  Hereinafter, a lifting method and a lifting assist device using the crane of the present invention will be described based on the embodiments shown in the drawings.

  As illustrated in FIGS. 1 and 2, the lifting assist device 1 of the present invention (hereinafter referred to as assist device 1) is used in a state of being suspended by a crane hook 11. In this embodiment, the auxiliary device 1 is suspended from a crane hook 11 attached to a crane wire 10 of a crane 7 installed on a hoist ship 13. In addition to the auxiliary device 1, a hanging wire 6 having a hanging tool 6 a such as a shackle is hung on the crane hook 11.

  The auxiliary device 1 includes a length adjusting cord 3 and a winding core 2 that winds and feeds out the length adjusting cord 3. The winding core 2 is rotated forward and reverse by the drive motor 2a. The length adjusting cord 3 has a connecting portion 3a at the lower end. The connecting portion 3 a connects and fixes the length adjusting cord 3 to an arbitrary position of the hanging wire 6. As will be described later, the length adjusting cord 3 is not required to have an excessive load resistance. Therefore, the length adjusting cord 3 is not limited to a steel wire or a steel cord, and various types of ropes such as resin ropes, elastic members such as rubber strings, and the like. Things can be used.

  In this embodiment, a wireless controller 4 and a receiver 5 are further provided. The wireless controller 4 wirelessly transmits the operation contents of feeding and winding the length adjusting cord 3. The receiver 5 receives the transmission signal from the wireless controller 4, operates the drive motor 2 a based on the operation content from the wireless controller 4, and feeds and winds up the length adjusting cord 3.

  Hereinafter, a procedure for lifting the suspended load 15 using the auxiliary device 1, that is, a lifting method using the crane of the present invention will be described by taking as an example a case where the suspended load 15 such as a pile loaded on the carriage 14 is lifted. To do.

  A crane hook 11 is attached to each of the two crane wires 10, and the auxiliary device 1 and the suspension wire 6 are suspended from each crane hook 11. The lower end of the length adjusting cord 3 is connected and fixed to an appropriate position of the hanging wire 6 (for example, the central portion in the length direction of the hanging wire 6) by the connecting portion 3a. A carrier ship 14 is adjacent to the hoist ship 13. Here, the swing body 9 and the boom 8 of the crane 7 are moved to appropriate positions, the hoisting drum 12 is driven to rotate, and the crane wire 10 is fed out. Thereby, the hanging tool 6a in the lower end part of the hanging wire 6 is moved downward toward the hanging load 15.

  At this time, the hanging tool 6a swings due to the movement of the boom 8 and the influence of wind and waves. Therefore, using the wireless controller 4, the winding core 2 of the auxiliary device 1 is operated to wind and feed out the length adjusting cord 3. When the length adjusting cord 3 is wound up, the distance between the crane hook 11 and the hanging tool 6a is shortened as illustrated in FIG. As illustrated in FIG. 2, when the wound length adjusting cord 3 is extended, the distance between the crane hook 11 and the hanging tool 6a is increased. Here, the distance between the crane hook 11 and the lifting tool 6a is adjusted so that the swinging of the lifting tool 6a is reduced. Generally, as illustrated in FIG. 3, when the distance between the crane hook 11 and the hanging tool 6a is shortened, the swinging width of the hanging tool 6a can be reduced.

  In this way, while observing the swing of the suspension 6a, the wireless controller 4 is operated to adjust the distance between the crane hook 11 and the suspension 6a, thereby reducing the suspension width of the suspension 6a. The hanger 6a is moved downward near the attachment position of the load 15. An operator holds the hanging tool 6a that has moved downward, and fixes the hanging tool 6a to the suspended load 15 via a fixing portion 16 such as a hanging piece.

  After attaching the lifting tool 6 a to the suspended load 15, the hoisting drum 12 is driven to rotate, the crane wire 10 is wound up, and the suspended load 15 is lifted by the crane 7. In this lifting operation, the length adjusting cord 3 is extended by the auxiliary device 1 until the weight of the suspended load 15 to be lifted becomes a length that does not act on the length adjusting cord 3. After this state, the suspended load 15 is lifted by the crane 7 as illustrated in FIG. In the state of FIG. 4, the weight of the suspended load 15 acts on the crane wire 10 and the suspension wire 6. On the other hand, since the length adjusting cord 3 is slack, the weight of the suspended load 15 does not act. Next, the revolving structure 9 and the boom 8 are moved to appropriate positions, and the suspended load 15 is moved to a target location.

  As described above, in the present invention, the operation of the crane 7 (raising and lowering the boom 8, feeding the crane wire 10, turning the swivel body 9) is performed as usual, and the length adjusting cord is attached when the lifting tool 6 a is attached to the suspended load 15. By unwinding or winding 3, the swinging width of the lifting tool 6 a can be reduced simply by adjusting the distance between the crane hook 11 and the lifting tool 6 a so that the swinging of the lifting tool 6 a is reduced. That is, it is possible to safely attach the hanging tool 6a to the suspended load 15 by suppressing the swing of the hanging tool 6a at the lower end of the hanging wire 6 suspended from the crane hook 11 without performing a complicated operation. It has become.

  When the suspended load 15 is a large-scale pile or the like, the size and weight of the hanging tool 6a are increased (for example, the weight is about 20 kg), and the swinging of the hanging tool 6a becomes extremely dangerous for the operator. In particular, in the case of the lifting work by the crane 7 installed on the ship, the wave is added to the lifting work compared with the case of the lifting work by the crane installed on the land. It becomes difficult to ensure the safety of workers. Even in such a case, by applying the present invention, the swinging width of the hanging tool 6a can be suppressed and the safety of the worker can be ensured. It is advantageous to avoid the problem of lengthening. Of course, the present invention can also be applied to lifting work using a crane installed on land.

  In the present invention, after the lifting tool 6a is attached to the suspended load 15, the weight of the suspended load 15 to be lifted is not applied to the length adjusting cord 3, so that the length adjusting cord 3 can be designed to have a small load resistance. Accordingly, it is very advantageous to reduce the weight and size of the auxiliary device 1.

  For example, in the case of the crane hook 11 having a lifting load of 10 tons, the hanging wire 6 having a diameter of about 50 mm, a length of about 25 m, and a weight of about 300 kg is used. On the other hand, in order to adjust the length of the crane hook 11 and the hanging tool 6a, the length adjusting cord 3 is sufficient if there is a load resistance capable of moving the hanging wire 6 up and down. That is, in this case, the length adjusting cord 3 is capable of safely suspending a weight of about 300 kg (strictly, a force for dealing with a repulsive force generated when the suspension wire 6 is bent is added). Therefore, a load resistance of about several percent is sufficient as compared with the load resistance (10 tons) of the hanging wire 6.

  In this embodiment, since the length adjusting cord 3 is drawn out and wound by the auxiliary device 1 by wireless operation, the length adjusting cord 3 is drawn out and wound at a position where it is easy to confirm the swinging condition of the hanging tool 6a. It is possible to perform a take-off operation.

  In this embodiment, in order to lift an excessively heavy suspended load 15, the crane 7 is provided with a plurality of crane wires 10, and a crane hook 11 is attached to each crane wire 10. The length adjusting cord 3 of the auxiliary device 1 suspended from each crane hook 11 is connected and fixed to the suspension wire 6 suspended from each crane hook 11. The present invention is not limited to the case where there are a plurality of crane wires 10 (crane hooks 11) as in this embodiment, and can also be applied to the case where there is a single crane wire 10 (crane hook 11).

  Further, not only a configuration in which one auxiliary wire 1 is moved up and down by one auxiliary device 1 but also a configuration in which a plurality of hanging wires 6 are moved up and down by one auxiliary device 1 can be adopted. When a plurality of suspension wires 6 are moved up and down by one auxiliary device 1, the length adjusting cord 3 is connected to each suspension wire 6 one by one. Alternatively, one length adjusting cord 3 is branched in the middle and connected to each of the plurality of hanging wires 6.

  The connecting portion 3a of the length adjusting cord 3 can be moved in the longitudinal direction of the suspension wire 6 and can be fixed at an arbitrary position. And it is good to avoid that stress concentrates on the specific location of the hanging wire 6 by changing the position which fixes the connection part 3a moderately.

  The connecting portion 3a may be provided with a safety mechanism that immediately releases the connection with the suspension wire 6 when a preset limit load acts on the length adjusting cord 3. When this safety mechanism is provided, if a preset limit load is applied to the length adjusting cord 3 for some reason, no further load is applied to the length adjusting cord 3, thereby preventing the auxiliary device 1 from being damaged. It is very effective. For example, the limit load is set to be equal to or less than the guaranteed load capacity of the length adjusting cord 3.

  The auxiliary device 1 is not limited to the structure in which the winding core 2 is rotated by the drive motor 2a as exemplified in the embodiment, and other structures can also be adopted. For example, a structure similar to that of a tape measure wound by a biasing force of a mainspring spring in which a drawn tape-like measure is incorporated can be used. In this case, the spring 2 is attached to the winding core 2 and the length adjusting cord 3 is wound up by the urging force of the spring.

  In the case of this structure, until the hanging tool 6a is attached to the hanging load 15, the length adjusting cord 3 is wound up by the urging force of the mainspring and the distance between the crane hook 11 and the hanging tool 6a is shortened to Reduce the swing width. After the lifting tool 6a is attached to the suspended load 15, the length adjusting cord 3 is unwound until the crane wire 10 is wound up and a weight is applied to the suspended wire 6. Then, after the weight of the suspended load 15 acts on the hanging wire 6, the weight of the suspended load 15 does not substantially act on the length adjusting cord 3, and the suspended load 15 is lifted by the crane wire 10 and the hanging wire 6. It is done.

DESCRIPTION OF SYMBOLS 1 Lifting auxiliary device 2 Winding core 2a Drive motor 3 Length adjusting cord 3a Connection part 4 Wireless controller 5 Receiver 6 Hanging wire 6a Hanging tool 7 Crane 8 Boom 9 Revolving body 10 Crane wire 11 Crane hook 12 Lifting drum 13 Hoist ship 14 Carrier ship 15 Suspended load 16 Fixed part

Claims (8)

In the lifting method using a crane in which a lifting device attached to a lower end portion of a hanging wire suspended from a crane hook is attached to a suspended load, and the suspended load attached with the lifting device is lifted by a crane, the crane hook has a length. When the lifting auxiliary device for extending and winding the adjustment rope is suspended, the length adjustment rope is connected and fixed to the hanging wire, and the lifting aid is attached to the suspended load by the lifting auxiliary device. The distance between the crane hook and the suspension tool is adjusted so that the swing of the suspension tool is reduced by extending or winding the adjustment cord, and after the suspension tool is attached to the suspended load, When the load is lifted by the crane, the lifting aid device moves the weight of the suspended load up to the length that does not act on the length adjusting cord. And decremental length adjusting ropes, lifting the feed and take-up of the length adjusting search by the lifting aid using a crane and performing a wireless operation method. In the lifting method using a crane in which a lifting device attached to a lower end portion of a hanging wire suspended from a crane hook is attached to a suspended load, and the suspended load attached with the lifting device is lifted by a crane, the crane hook has a length. A lifting assist device for feeding and winding the adjustment cord is suspended, the length adjustment cord is connected and fixed to the suspension wire, and the connection portion for connecting and fixing the length adjustment cord to the suspension wire is set in advance. When a limit load is applied to the length adjusting cord, a safety mechanism is provided to release the connection and fixing to the hanging wire, and when the hanging tool is attached to the hanging load, the length adjustment is performed by the lifting assist device. Adjusting the distance between the crane hook and the suspension tool so that the swing of the suspension tool is reduced by extending or winding the rope; After the suspension load is attached to the suspended load, the lifting assist device is used to lift the length adjusting cord until the weight of the suspended load that is lifted by the crane becomes a length that does not act on the length adjusting cord. A lifting method using a crane characterized by feeding out. The lifting method using the crane according to claim 1 or 2 , wherein the crane is installed in a ship.   The length adjusting cord that the crane has a plurality of crane wires and is extended and wound by a suspension assisting device suspended from each crane hook on a suspension wire suspended from each crane hook. A lifting method using the crane according to any one of claims 1 to 3. A lifting assist device that extends and winds up a length adjustment cord while being suspended from a crane hook, the length adjustment cord having a lifting tool at a lower end and suspended from the crane hook. The crane hook and the suspension tool are connected and fixed to a suspension wire, and when the suspension tool is attached to a suspended load, the swing of the suspension tool is reduced by extending or winding the length adjusting cord. And adjusting the distance to the suspended load until the weight of the suspended load lifted when the suspended load is lifted by a crane becomes a length that does not act on the length adjusting cord. in the arrangement for feeding a length adjusting rope, and a wireless controller for wirelessly transmitting the feeding and operation content of the winding of the length adjusting ropes, to receive a transmission signal from the wireless controller A signal device is provided, based on the operation content from the wireless controller the receiver has received, lifting, characterized in that the configuration in which the feed and take-up of the length adjusting search aid. A lifting assist device that extends and winds up a length adjustment cord while being suspended from a crane hook, the length adjustment cord having a lifting tool at a lower end and suspended from the crane hook. Connected and fixed to the suspension wire, and the connection fixing to the suspension wire is released when a preset limit load is applied to the connection portion that connects and fixes the length adjustment cord to the suspension wire. The crane hook and the hoist so that the swing of the hoist can be reduced by extending or winding the length adjusting cord when the hoist is attached to the hoisted load. After adjusting the distance to the suspended load, the weight of the suspended load lifted when the suspended load is lifted by the crane becomes a length that does not act on the length adjusting cord. Lifting aid is characterized in that the arrangement for feeding the length adjustment search. The connecting portion for connecting fixing the length adjustment cord to the hanging wire, claim the preset critical load is provided a safety mechanism for releasing the connection fixed to said suspended wire when acting on said length adjusting search 5. The lifting assist device according to 5 . The lifting assist device according to any one of claims 5 to 7, wherein the crane is installed on a ship.

Images