JP6645222B2 - How to attach a crane jib - Google Patents

Description

  The present invention relates to a method for mounting a jib provided on a crane.

  2. Description of the Related Art Conventionally, a mobile crane having a crane body, a boom, and a jib is known. The boom is mounted on the front of the crane body and the jib is mounted on the tip of the boom.

  Patent Literature 1 discloses a technique in which a wheel is mounted on a tip of a jib of a crane. In a crane assembling operation, a hiding type assembling method in which the jib is folded down below the boom while wheels arranged on the jib roll on the ground, and an extending type assembling method in which the jib is extended on an extension of the boom. Is disclosed.

JP-A-2002-255478

  Conventionally, when the above-mentioned jib is attached to the crane main body, the jib has been lifted by an auxiliary crane prepared separately from the crane main body. In this case, there is a problem that a large space is required for assembling the jib, and a lot of time and labor are required for assembling preparation.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a crane jib mounting method capable of mounting a jib to a boom by using a driving force of the crane.

  A method of attaching a jib to a crane according to one aspect of the present invention includes a crane body, a boom rotatably supported by the crane body on a base end side, and a boom provided at a distal end side, and the boom support section of the boom. A jib having a rotatably supported pivotally supported portion, and a sheave, supported at the rear end of the jib at the distal end of the boom, and connected to the jib to support the jib. A strut, a winch, and a rope pulled out of the winch and hung on the sheave of the strut, wherein the jib is attached to the boom. With the boom lying down on the ground, the pivoted portion of the jib is arranged at a predetermined horizontal distance from the pivoted portion of the boom. A jib preparing step of arranging the jib on the ground, a hanger preparing step of preparing a hanger for lifting the base end side of the jib, and the hoist being interlocked with a winding operation of the rope by the winch. Connecting the hoist to the rope and the base end of the jib so that the jig rises, and lifting the base end of the jib by a winding operation of the rope by the winch, while the jib covers the jib. A moving step of moving the jib until the pivot portion reaches the pivot portion of the boom; and a fixing step of fixing the pivoted portion of the jib to the pivot portion of the boom. .

  According to this configuration, the jib can be attached to the boom using the driving force of the winch of the crane. This reduces the need to prepare an auxiliary crane for mounting the jib. Further, the space required for assembling the jib is reduced, and the time and labor required for assembling preparation are reduced.

  In the above configuration, in the connecting step, the hanging member is connected to a tip portion of the rope hanging down from the sheave of the strut, and in the moving step, the rope is wound up by a winch winding operation. It is desirable to lift the base end side of the jib by a lifting tool.

  According to this configuration, the jib can be lifted while the rope is wound by the winch hoisting force.

  In the above configuration, the strut of the crane includes a first sheave as the sheave, and a front strut rotatably supported on a tip side of the boom at a position on a rear side of the jib; And a rear strut rotatably supported on the distal end side of the boom at a position further rearward of the front strut, wherein the crane has a distal end side of the front strut. By further connecting the front end side of the jib with the rear strut, the front strut and the jib further have a guy line for integrally rotating the jib, and the connection step is interlocked with a winding operation of the winch. Forwardly move the rope pulled out of the winch so that the front strut rotates with respect to the rear strut. A step of winding a plurality of times between the second sheave of the rear strut and the first sheave of the front strut and then fixing the same at a predetermined fixed position, and a step of hanging the guy line from the tip side of the front strut Connecting the hanging tool to the tip of the suspended guy line so that the hanging tool rises with the rotation of the front strut with respect to the rear strut. It is preferable that the rope be hoisted by the winch hoisting operation, and the base end side of the jib be hoisted by the hoist while the front strut is rotated with respect to the rear strut.

  According to this configuration, the front strut is rotated with respect to the rear strut by the hoisting force of the winch. Then, the jib can be lifted by the hanging tool connected to the guy line hanging down from the front strut.

  In the above configuration, in the hanging tool preparing step, an extendable cylinder connected to the hanging tool is further prepared, and after moving the jib in the moving step, the cylinder is expanded and contracted, and the boom It is preferable that the method further includes an adjusting step of adjusting a position of the supported portion of the jib with respect to a supporting portion.

  According to this configuration, the axially supported portion of the jib can be accurately aligned with the axially supported portion of the boom by the expansion and contraction of the cylinder.

  In the above configuration, it is preferable that, in the hanging tool preparing step, the hanging tool be connected to an upper surface of the jib arranged on the ground.

  According to this configuration, the attachment of the hanging tool to the jib is quickly realized.

  In the above configuration, it is preferable that, in the hanging tool preparing step, the hanging tool be connected to a lower surface portion of the jib arranged on the ground.

  According to this configuration, the hanging tool can stably lift the long jib.

  In the above configuration, in the jib preparing step, a wheel mounted on the tip of the jib and capable of rolling on the ground is further prepared, and in the moving step, the base end side of the jib is lifted, and the jib is lifted on the ground. It is desirable to move the jib while rolling the wheels.

  According to this configuration, the movement of the jib in the moving process is smoothly realized.

  ADVANTAGE OF THE INVENTION According to this invention, the jib attachment method of the crane which can attach the jib with respect to a boom using the driving force with which a crane is provided is provided.

It is a side view of the crane concerning one embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 1st embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 1st embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 1st embodiment of the present invention. FIG. 2 is a cross-sectional view showing a lifting tool for lifting a jib in the crane according to the first embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 1st embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 1st embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 1st embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 2nd embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 2nd embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 2nd embodiment of the present invention. It is a sectional view showing a hanger which lifts a jib in a crane concerning a 2nd embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 2nd embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 2nd embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 2nd embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 3rd embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 3rd embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 3rd embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 3rd embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 3rd embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 3rd embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 4th embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 4th embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 4th embodiment of the present invention. It is a sectional view showing a hanger which lifts a jib in a crane concerning a 4th embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 5th embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 5th embodiment of the present invention. It is a process figure showing signs that a jib is attached to a boom in a crane concerning a 5th embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 5th embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 5th embodiment of the present invention. It is a process figure showing signs that a jib is detached from a boom in a crane concerning a 5th embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a crane 10 according to the first embodiment of the present invention. In the following, directions of “up”, “down”, “front” and “rear” are shown in each drawing, and the directions are used to explain the structure and assembling method of the crane 10 according to the present invention. It is shown for the sake of convenience, and does not limit the moving direction, usage mode, and the like of the crane 10. In the present embodiment, the crane 10 has a luffing jib structure in which the jib can rotate.

  The crane 10 includes a revolving body 12 corresponding to a crane main body, a traveling body 14 that rotatably supports the revolving body 12, an up-and-down member including a boom 16 and a jib 18, and a lattice mast 65 that is a boom-up / down member. A box mast 20. In addition, a counterweight 13 for adjusting the balance of the crane 10 is loaded on a rear portion of the revolving unit 12, and a counterweight 72 is further disposed behind the revolving unit 12. A cab 15 is provided at the front end of the revolving superstructure 12. The cab 15 corresponds to a driver's seat of the crane 10.

  The boom 16 shown in FIG. 1 is a so-called lattice type, and includes a base end member 16A, one or more (two in the illustrated example) intermediate members 16B and 16C, and a front end member 16D. Specifically, the base end member 16A is connected to the front portion of the revolving unit 12 so as to be rotatable in the up-and-down direction. The intermediate members 16B and 16C are detachably attached to the distal end side of the base end member 16A in that order. The distal end member 16D is detachably attached to the distal end side of the intermediate member 16C, and a rear strut 21 and a front strut 22 for rotating the jib 18 are rotated at the distal end of the distal end member 16D as described later. Linked as possible. The boom 16 is pivotally supported (supported) by the revolving unit 12 around a boom foot 16S provided at a lower end portion as a fulcrum. A jib shaft support 16P (shaft support) (FIG. 2A) is disposed at the front end of the front member 16D of the boom 16.

  However, the specific structure of the boom is not limited in the present invention. For example, the number of intermediate members of the boom may be different from the above. Further, the boom may be constituted by a single member.

  The specific structure of the jib 18 is not limited, but has a lattice type structure in the illustrated example. At the base end of the jib 18, a jib foot 18S (supported portion) is arranged (FIG. 2A). The jib foot 18S serves as a fulcrum for the rotation of the jib 18. The jib foot 18S is rotatably connected (supported) to a jib shaft support 16P of the boom 16. The center axis of rotation of the jib 18 (jib foot 18S) is a horizontal axis parallel to the center axis of rotation of the boom 16 with respect to the revolving unit 12 (boom foot 16S). In addition, the crane 10 includes wheels 18R attached to the tip of the jib 18 (FIG. 1). The wheel 18 </ b> R has a function of rolling on the ground G when the jib 18 is assembled or disassembled with the boom 16.

  The lattice mast 65 has a base end and a rotation end (tip), and the base end (mast foot 65S) is rotatably connected to the revolving unit 12 at a position on the rear side of the boom 16. Although the specific structure of such a mast is not limited, it has a lattice type structure in the illustrated example. The rotation axis of the lattice mast 65 is parallel to the rotation axis of the boom 16 and located immediately behind the rotation axis of the boom 16. That is, the mast foot 65S is also rotatable in the same direction as the up and down direction of the boom 16. On the other hand, the rotating end of the mast foot 65S is connected to the tip of the boom 16 via a boom hoisting rope 68 and a pair of left and right guy links 67. With this connection, the lattice mast 65 becomes a support for the rotation of the boom 16.

  The box mast 20 has a base end and a rotation end (tip), and the base end is rotatably connected to the revolving unit 12 at a position on the rear side of the lattice mast 65. The box mast 20 has a rectangular shape in a sectional view. The rotation axis of the box mast 20 is arranged in parallel with the rotation axis of the boom 16 and at substantially the same position as the rotation axis of the lattice mast 65. That is, the box mast 20 is rotatable in the same direction as the up and down direction of the boom 16. On the other hand, the rotating end of the box mast 20 is connected to the tip of the lattice mast 65 via a pair of left and right guy links 69. This connection makes the rotation of the lattice mast 65 and the rotation of the box mast 20 cooperate.

  A pair of left and right backstops 23 are provided on the boom 16. These back stops 23 come into contact with the left and right sides of the revolving superstructure 12 when the boom 16 reaches the standing posture shown in FIG. This abutment restricts the boom 16 from being pushed backward by strong wind or the like.

  The rear strut 21 and the front strut 22 are rotatably supported by the distal end of the boom 16 at a position behind the jib 18. The rear strut 21 is held in a posture protruding from the tip of the tip side member 16D to the boom rising side (the left side in FIG. 1). As means for maintaining this posture, a pair of left and right backstops 25 and a pair of left and right guy links 26 are interposed between the rear strut 21 and the boom 16. The backstop 25 is interposed between the distal end member 16D and the intermediate portion of the rear strut 21, and supports the rear strut 21 from below. The guy link 26 is stretched so as to connect the distal end portion of the rear strut 21 and the base member 16A of the boom 16, and regulates the position of the rear strut 21 by the tension.

  The front strut 22 is connected to the jib 18 so as to rotate (integrally) in conjunction with the jib 18. More specifically, a pair of left and right jib guy lines 28 are stretched so as to connect the tip of the front strut 22 and the tip of the jib 18. Accordingly, the jib 18 is also rotationally driven by the rotational driving of the front strut 22. The above-mentioned rear strut 21 is disposed behind the front strut 22 as shown in FIG. 1 and forms a substantially isosceles triangular shape with the front strut 22.

  Various winches are mounted on the crane 10. Specifically, a mast hoisting winch 30 for turning the box mast 20 to raise and lower the lattice mast 65, a boom hoisting winch 66 for raising and lowering the boom 16, and a jib 18 for turning the jib 18 in the hoisting direction. And a main winding winch 34 (winch) and an auxiliary winding winch 36 (winch) for lifting and lowering the suspended load. In the crane 10 according to the present embodiment, the mast hoisting winch 30 is installed near the base end of the box mast 20, and the boom hoisting winch 66 is installed near the base end of the lattice mast 65. Further, the jib hoisting winch 32, the main winding winch 34, and the auxiliary winding winch 36 are all mounted on the base end side member 16A of the boom 16. These winches 30, 66, 32, 34, 36 may be mounted on the swing body 12.

  The mast hoisting winch 30 winds and unwinds the mast hoisting rope 38. Then, the mast hoisting rope 38 is routed so that the box mast 20 is rotated by the winding and unreeling. Specifically, sheave blocks 40 and 42 in which a plurality of sheaves are arranged in the width direction are provided at the rotating end portion of the box mast 20 and the rear end portion of the revolving unit 12, respectively, and are pulled out from the mast hoisting winch 30. The mast hoisting rope 38 is wound between the sheave blocks 40 and 42. Therefore, when the mast hoisting winch 30 winds or unwinds the mast hoisting rope 38, the distance between the two sheave blocks 40 and 42 changes, whereby the box mast 20 and the lattice mast 65 interlocked therewith are changed. It turns in the undulating direction. The rotation of the box mast 20 and the lattice mast 65 is performed when the crane 10 is assembled. That is, in the use posture of the crane 10 shown in FIG. 1, the positions of the box mast 20 and the lattice mast 65 are substantially fixed.

  The boom hoisting winch 66 winds and unwinds the boom hoisting rope 68. Then, a boom hoisting rope 68 is arranged so that the boom 16 is rotated by the winding and unwinding. Specifically, sheave blocks 68A and 68B in which a plurality of sheaves are arranged in the width direction are provided near the rear end of the guy link 67 and the rotating end of the lattice mast 65, respectively. The pulled-out boom hoisting rope 68 is stretched between the sheave blocks 68A and 68B. Accordingly, when the boom hoisting winch 66 winds or unwinds the boom hoisting rope 68, the distance between the two sheave blocks 68A and 68B changes, whereby the boom 16 connected to the guy link 67 moves in the hoisting direction. To rotate.

  The jib hoisting winch 32 winds and unwinds a jib hoisting rope 44 (rope) wound between the rear strut 21 and the front strut 22. Then, the jib hoisting rope 44 is routed so that the front strut 22 is rotated by the winding or feeding. Specifically, a guide sheave 46 is provided at a longitudinally intermediate portion of the rear strut 21, and a plurality of sheaves are arranged in the width direction at the turning end of the rear strut 21 and the turning end of the front strut 22. Sheave blocks 47 and 48 are provided. Then, the jib hoisting rope 44 drawn out from the jib hoisting winch 32 is hung on the guide sheave 46 and is hung between the sheave blocks 47 and 48. Therefore, when the jib hoisting winch 32 winds or unwinds the jib hoisting rope 44, the distance between the sheave blocks 47 and 48 is changed, and the front strut 22 and the jib 18 interlocked therewith are rotated in the hoisting direction. . In addition, the rear strut 21 and the front strut 22 constitute the strut 10S of the present invention. The strut 10S functions as a support for the rotation of the jib 18.

  The main winding winch 34 hoists and lowers the suspended load by the main winding rope 50 (rope). With respect to the main winding, guide winding sheaves 52, 53, 54 are provided rotatably at a portion near the base end of the rear strut 21, a portion near the base end of the front strut 22, and a tip portion of the jib 18, respectively. A main winding sheave block in which a plurality of main winding point sheaves 56 are arranged in the width direction is provided at a position adjacent to the main winding guide sheave 54. The main winding rope 50 pulled out from the main winding winch 34 is hung on the main winding guide sheaves 52, 53, 54 in order, and is attached to the main winding point sheave 56 of the sheave block and the main hook 57 for suspended load. It is bridged between the sheave 58 of the provided sheave block. Therefore, when the main winding winch 34 (winding winch) winds or unwinds the main winding rope 50, the distance between the sheaves 56 and 58 changes, and the main winding rope suspended from the tip of the jib 18. The main hook 57 connected to 50 is raised and lowered.

  Similarly, the auxiliary winch 36 raises and lowers the suspended load by the auxiliary rope 60. For this auxiliary winding, auxiliary winding guide sheaves 62, 63, 64 are rotatably provided coaxially with the main winding guide sheaves 52, 53, 54, respectively, and are not shown at positions adjacent to the auxiliary winding guide sheave 64. Are provided rotatably. The auxiliary rope 60 pulled out from the auxiliary winch 36 is hung on the auxiliary guide sheaves 62, 63, 64 in order, and is hung from the auxiliary point sheave. Accordingly, when the auxiliary winch 36 winds or unwinds the auxiliary rope 60, an auxiliary hook (hook) for a suspended load (not shown) connected to the end of the auxiliary rope 60 is wound up or down. Can be

  A counter weight 72 disposed on the ground behind the revolving unit 12 is connected to a rotating end of the lattice mast 65 by a weight line 71.

  Next, a method of attaching the jib 18 according to the first embodiment of the present invention will be described with reference to FIGS. 2A to 3C. FIG. 2A to FIG. 2C are process diagrams illustrating a state in which the jib 18 is mounted on the boom 16 in the crane 10 according to the present embodiment. FIG. 2D is a cross-sectional view showing the lifting section 90 (hanging tool) that lifts the jib 18 in the crane 10 according to the present embodiment, and corresponds to a view from the viewpoint AA in FIG. 2A. FIGS. 3A to 3C are process diagrams showing a state in which the jib 18 is detached from the boom 16 in the crane 10.

  As shown in FIG. 2A, prior to the mounting step of the jib 18 to the boom 16, the box mast 20, the lattice mast 65, and the boom 16 are mounted on the revolving unit 12, and the rear strut 21 and the front strut 22 are mounted on the boom 16. ing. A boom hoisting rope 68 and a guy link 67 are connected between the tip of the lattice mast 65 and the tip of the boom 16. Further, a guy link 26 is connected to the proximal end of the boom 16 and the distal end of the rear strut 21. The jib hoisting rope 44 pulled out from the jib hoisting winch 32 is wound a plurality of times between the tip of the rear strut 21 and the tip of the front strut 22. The main winding rope 50 pulled out from the main winding winch 34 is hung on the main winding guide sheaves 52 and 53 of the rear strut 21 and the front strut 22 (FIG. 2B).

  As a first step of mounting the jib 18, in a state where the boom 16 pivotally supported by the revolving unit 12 is laid down on the ground, the jib foot 18S of the jib 18 is moved to a predetermined position in the horizontal direction with respect to the jib pivot 16P of the boom 16. The jib 18 is placed on the ground so as to be spaced apart (FIG. 2A) (jib preparation step). At this time, the distal end side of the boom 16 is supported by a first pedestal M1 which is previously arranged on the ground. A substantially central portion in the longitudinal direction of the jib 18 is supported by a second pedestal M2 which is disposed on the ground in advance. Further, a wheel 18R disposed at the tip of the jib 18 is in contact with the ground.

  As a second step of attaching the jib 18, the operator prepares the lifting section 90 (hanging tool) (hanging tool preparing step). The lifting section 90 is connected to the base end side of the jib 18. With reference to FIG. 2D, the lifting unit 90 includes a lifting balance 91, a hanging rope 92, and a shackle 93. The hanging balance 91 is a known component, and has a triangular shape as shown in FIG. 2D. The operator hangs the upper end of the hanging balance 91 from the main winding guide sheave 53 of the front strut 22 so that the hanging tool 90 is raised in conjunction with the winding operation of the main winding rope 50 by the main winding winch 34. Connect to the main winding rope 50 (connection step). Further, a pair of hanging ropes 92 is suspended from both ends of the hanging balance 91. Then, the worker connects the pair of shackles 93 provided at the lower end of the hanging rope 92 to both ends of the lower frame 18L (lower surface portion) of the jib 18 (connection step). As a result, the jib 18 can be lifted by the lifting section 90.

  As a third step of attaching the jib 18, the operator performs a winding operation of the main winding winch 34 to wind the main winding rope 50. Then, while lifting the base end side of the jib 18 by the lifting section 90, the jib 18 is moved until the jib foot 18S of the jib 18 reaches the jib shaft support 16P of the boom 16 (arrow D21 in FIG. 2B) (moving step). At this time, the jib 18 rises from the second pedestal M2, and the wheels 18R roll on the ground. For this reason, the movement of the jib 18 by the lifting unit 90 is smoothly realized.

  Referring to FIG. 2B, the connecting portion of lifting portion 90 to jib 18 is disposed at a position horizontally away from main winding guide sheave 53 of front strut 22 by distance L. For this reason, when the main winding rope 50 is hoisted, the lifting portion 90 is rotated around the main winding guide sheave 53 as a fulcrum, so that the lifting and the horizontal movement of the jib 18 are stably realized. The position of the front strut 22 may be moved before and after the winding operation of the main winding winch 34, or simultaneously with the winding operation of the main winding winch 34, by raising and lowering the jib hoisting winch 32.

  As a fourth step of attaching the jib 18, the worker fixes the jib foot 18S to the jib shaft support 16P by inserting a pin (not shown) into the jib shaft support 16P and the jib foot 18S (FIG. 2C) (fixing step). . As a result, the jib 18 is rotatably supported by the boom 16. Thereafter, the worker removes the lifting section 90 from the jib 18 and the main winding rope 50. The main winding rope 50 is hung on the main winding guide sheave 54 (FIG. 1) on the distal end side of the jib 18.

  With reference to FIGS. 3A to 3C, an operation (disassembly operation) of detaching the jib 18 from the boom 16 will be described. Referring to FIG. 3A, as a first step of disassembling the jib 18, a pin (not shown) fixing the jib shaft support 16P and the jib foot 18S is pulled out by an operator.

  As a second step of disassembling the jib 18, the operator pulls out the jib hoisting rope 44 by the jib hoisting winch 32 (FIG. 2A), and rotates the front strut 22 in the direction of the arrow D31 in FIG. 3B. As a result, the front strut 22 moves slightly downward, and the jib foot 18S of the jib 18 suspended with the main winding guide sheave 53 as a fulcrum separates from the jib shaft support 16P of the boom 16. Also at this time, since the wheels 18R provided on the jib 18 roll on the ground, the jib 18 moves smoothly.

  As a third step of disassembling the jib 18, the operator draws out the main winding rope 50 (arrow D32 in FIG. 3C) using the main winding winch 34 (FIG. 2A), and relaxes the main winding rope 50. Then, the lifting balance 91 (FIG. 2D) of the lifting unit 90 is removed from the main rope 50, and the shackle 93 (FIG. 2D) of the lifting unit 90 is removed from the jib 18.

  As described above, in the present embodiment, the jib 18 can be attached to the boom 16 by itself using the driving force of the main winding winch 34 of the crane 10. Therefore, the necessity of preparing another auxiliary crane for mounting the jib 18 is reduced. Further, the space required for attaching the jib 18 is reduced, and the time and labor required for the preparation for assembly are reduced. Further, in the present embodiment, the lifting section 90 is connected to the main winding rope 50. For this reason, the main winding rope 50 is wound up by the hoisting force of the main winding winch 34, and the hoisting section 90 can hoist the jib 18. Furthermore, the jib 18 can be attached by using the main winding winch 34 and the main winding rope 50 installed for lifting the object to be hoisted when the crane 10 is used. Further, since the lifting section 90 is connected to the lower frame 18L (FIG. 2D) of the jib 18, the lifting section 90 can stably lift the long jib 18.

  Next, a method for attaching the jib 18 according to the second embodiment of the present invention will be described with reference to FIGS. 4A to 5C. FIG. 4A to FIG. 4C are process diagrams showing how the jib 18 is mounted on the boom 16 in the crane 10 according to the present embodiment. FIG. 4D is a cross-sectional view illustrating the lifting portion 90A (hanging tool) that lifts the jib 18 in the crane 10 according to the present embodiment, and corresponds to a diagram viewed from the viewpoint AA in FIG. 4A. FIGS. 5A to 5C are process diagrams showing a state in which the jib 18 is detached from the boom 16 in the crane 10. In the present embodiment, since the connection structure of the lifting portion 90A to the jib 18 is different from that of the first embodiment, the description will be focused on the difference.

  Also in the present embodiment, as a first step of attaching the jib 18, the jib foot 18 S of the jib 18 is moved with respect to the jib shaft support 16 P of the boom 16 in a state where the boom 16 pivotally supported by the revolving structure 12 is laid down on the ground. The jib 18 is arranged on the ground so as to be arranged at a predetermined interval in the horizontal direction (FIG. 4A) (jib preparation step).

  In addition, as a second step of attaching the jib 18, the operator prepares the lifting portion 90A (hanging tool) (hanging tool preparing step). The lifting section 90 </ b> A is connected to the base end side of the jib 18. Referring to FIG. 4D, the lifting unit 90A includes a suspension balance 91, a suspension rope 92, and a shackle 93. In the present embodiment, shackles 93 provided at the lower ends of the hanging ropes 92 are respectively connected to both ends of the upper frame 18T (upper surface portion) of the jib 18 arranged on the ground (connection step). As a result, the jib 18 can be lifted by the lifting section 90.

  As a third step of attaching the jib 18, the operator performs a winding operation of the main winding winch 34 to wind the main winding rope 50. Then, while lifting the base end side of the jib 18 by the lifting portion 90A, the jib 18 is moved until the jib foot 18S of the jib 18 reaches the jib shaft support 16P of the boom 16 (arrow D41 in FIG. 4B) (moving step). Also at this time, the movement of the jib 18 by the lifting portion 90A is smoothly realized.

  Also in this embodiment, referring to FIG. 4B, the connecting portion of lifting portion 90A to jib 18 is disposed at a position horizontally separated by distance L from main winding guide sheave 53 of front strut 22. Is done. For this reason, when the main winding rope 50 is hoisted, the lifting portion 90 </ b> A is rotated about the main winding guide sheave 53 as a fulcrum, so that the lifting and the horizontal movement of the jib 18 are stably realized.

  As a fourth step of attaching the jib 18, the worker fixes the jib foot 18S to the jib shaft support 16P by inserting a pin (not shown) into the jib shaft support 16P and the jib foot 18S (FIG. 4C) (fixing step). . As a result, the jib 18 is rotatably supported by the boom 16. Thereafter, the worker removes the lifting portion 90A from the jib 18 and the main winding rope 50. The main winding rope 50 is hung on the main winding guide sheave 54 (FIG. 1) on the distal end side of the jib 18.

  With reference to FIGS. 5A to 5C, an operation (disassembly operation) of detaching the jib 18 from the boom 16 will be described. Referring to FIG. 5A, as a first step of disassembling the jib 18, a pin (not shown) fixing the jib shaft support 16P and the jib foot 18S is removed by an operator.

  As a second step of disassembling the jib 18, the operator pulls out the jib hoisting rope 44 by the jib hoisting winch 32 (FIG. 4A), and rotates the front strut 22 in the direction of the arrow D51 in FIG. 5B. As a result, the front strut 22 moves slightly downward, and the jib foot 18S of the jib 18 suspended with the main winding guide sheave 53 as a fulcrum separates from the jib shaft support 16P of the boom 16. Also at this time, since the wheels 18R provided on the jib 18 roll on the ground, the jib 18 moves smoothly.

  As a third step of disassembly of the jib 18, the operator draws out the main winding rope 50 by the main winding winch 34 (arrow D52 in FIG. 5C) and relaxes the main winding rope 50. Then, the lifting balance 91 (FIG. 4D) of the lifting unit 90A is removed from the main winding rope 50, and the shackle 93 (FIG. 4D) of the lifting unit 90 is removed from the jib 18.

  As described above, also in the present embodiment, it is possible to attach the jib 18 to the boom 16 by using the driving force of the main winch 34 of the crane 10 by itself. Therefore, the necessity of preparing another auxiliary crane for mounting the jib 18 is reduced. Further, the space required for attaching the jib 18 is reduced, and the time and labor required for the preparation for assembly are reduced. Further, in the present embodiment, since the lifting portion 90A is connected to the upper frame 18T (FIG. 4D) of the jib 18, the mounting of the lifting portion 90A to the jib 18 can be quickly realized.

  Next, a method of attaching the jib 18 according to the third embodiment of the present invention will be described with reference to FIGS. 6A to 7C. FIG. 6A to FIG. 6C are process diagrams illustrating a manner in which the jib 18 is mounted on the boom 16 in the crane 10 according to the present embodiment. FIGS. 7A to 7C are process diagrams showing how the jib 18 is detached from the boom 16 in the crane 10. This embodiment differs from the first embodiment in the lifting structure of the jib 18, so that the following description will focus on the differences.

  As shown in FIG. 6A, prior to the mounting process of the jib 18 to the boom 16, the box mast 20, the lattice mast 65, and the boom 16 are mounted on the rotating body 12, and the rear strut 21 and the front strut 22 are mounted on the boom 16. ing. A boom hoisting rope 68 and a guy link 67 are connected between the tip of the lattice mast 65 and the tip of the boom 16. Further, a guy link 26 is connected to the proximal end of the boom 16 and the distal end of the rear strut 21. The jib hoisting rope 44 pulled out from the jib hoisting winch 32 is wound a plurality of times between the tip of the rear strut 21 and the tip of the front strut 22. The main winding rope 50 pulled out from the main winding winch 34 is hung on the main winding guide sheaves 52 and 53 of the rear strut 21 and the front strut 22 (FIG. 1).

  When the crane 10 is used, the tip of the jib hoisting rope 44 is fixed to a rope fixing portion 44Q provided on the tip side of the rear strut 21. Similarly, when the jib 18 of this embodiment is attached, the jib hoisting rope 44 is connected to the sheave block 47 (sheave, second sheave) of the rear strut 21 and the sheave block 48 (sheave, first sheave) of the front strut 22. ), And the tip of the jib hoisting rope 44 is fixed to the rope fixing portion 44Q. Then, the jib guy line 28 (rope or link) (FIG. 1) is hung from the front strut 22 (connection step). Then, in conjunction with the hoisting operation of the jib hoisting winch 32, the front strut 22 rotates so as to approach the rear strut 21.

  As a first step of mounting the jib 18, in a state where the boom 16 pivotally supported by the revolving unit 12 is laid down on the ground, the jib foot 18S of the jib 18 is moved to a predetermined position in the horizontal direction with respect to the jib pivot 16P of the boom 16. The jib 18 is arranged on the ground so as to be arranged at intervals (FIG. 6A) (jib preparation step).

  As a second step of attaching the jib 18, the operator prepares the lifting section 90 (hanging tool) (hanging tool preparing step). The structure of the lifting section 90 in the present embodiment is the same as that of the first embodiment (FIG. 2D). Shackles 93 provided at the lower ends of the hanging ropes 92 of the lifting section 90 are connected to both ends of the lower frame 18L (lower surface portion) of the jib 18, respectively. On the other hand, the upper end of the lifting balance 91 of the lifting section 90 is connected to the rope tip 44P hanging down from the sheave block 48 of the front strut 22 (FIG. 6A) (connection step).

  As a third step of attaching the jib 18, the operator performs a hoisting operation of the jib hoisting winch 32 to wind up the jib hoisting rope 44. As a result, the front strut 22 rotates so as to approach the rear strut 21 (arrow D61 in FIG. 6B). Then, the jib 18 moves until the jib foot 18S of the jib 18 reaches the jib shaft support 16P of the boom 16 while the lifting section 90 lifts the base end side of the jib 18 (moving step). Also at this time, since the wheel 18R rolls on the ground, the movement of the jib 18 by the lifting unit 90 is smoothly realized.

  Also in the present embodiment, the connecting portion of the lifting portion 90 to the jib 18 is disposed at a position horizontally away from the sheave block 48 of the front strut 22 by a distance L (FIG. 6B). For this reason, when the jib hoisting rope 44 is hoisted, the lifting portion 90 rotates about the sheave block 48, whereby the lifting and horizontal movement of the jib 18 are stably realized.

  As a fourth step of attaching the jib 18, the worker fixes the jib foot 18S to the jib shaft support 16P by inserting a pin (not shown) into the jib shaft support 16P and the jib foot 18S (FIG. 6C) (fixing step). . As a result, the jib 18 is rotatably supported by the boom 16. Thereafter, the worker removes the lifting section 90 from the jib 18, the rope tip 44P, and the jib 18.

  In the present embodiment, the jib hoisting rope 32 is fed out by the jib hoisting winch 32 after the jib 18 is attached. Then, the rear strut 21 and the front strut 22 fall down to just above the jib 18.

  With reference to FIGS. 7A to 7C, an operation (disassembly operation) of detaching the jib 18 from the boom 16 will be described. Referring to FIG. 7A, as a first step of disassembling jib 18, a pin (not shown) fixing jib shaft support 16P and jib foot 18S is removed by an operator.

  As a second step in disassembling the jib 18, the operator winds up the jib hoisting rope 44 with the jib hoisting winch 32 (FIG. 6A) and slightly turns the front strut 22 closer to the rear strut 21 (see FIG. 6). 7B arrow D70). As a result, the base end side of the jib 18 rises. Thereafter, the operator operates the traveling body 14 to move the revolving superstructure 12 including the boom 16 slightly away from the jib 18 (arrow D71 in FIG. 7B).

  As a third step of disassembly of the jib 18, the operator draws out the jib hoisting rope 44 by the jib hoisting winch 32 and rotates the front strut 22 downward (arrow D72 in FIG. 7C). Then, the worker removes the hanging balance 91 (FIG. 2D) of the lifting section 90 from the loosened rope tip 44P and also removes the shackle 93 of the lifting section 90 from the jib 18.

  As described above, also in the present embodiment, the jib 18 can be attached to the boom 16 by using the driving force of the jib hoisting winch 32 of the crane 10. Therefore, the necessity of preparing another auxiliary crane for mounting the jib 18 is reduced. Further, the space required for attaching the jib 18 is reduced, and the time and labor required for the preparation for assembly are reduced. In the present embodiment, the lifting section 90 is connected to the rope tip 44P. For this reason, the jib hoisting rope 44 is taken up by the hoisting force of the jib hoisting winch 32, and the hoisting portion 90 can hoist the jib 18. Further, the jib 18 can be attached using the jib hoisting winch 32 and the jib hoisting rope 44 which are installed for rotating and raising and lowering the jib 18 when the crane 10 is used. In other embodiments, the shackle 93 of the lifting unit 90 may be connected to the upper frame 18T of the jib 18, as in the second embodiment.

  Next, a method of attaching the jib 18 according to the fourth embodiment of the present invention will be described with reference to FIGS. 8A to 9C. FIGS. 8A to 8C are process diagrams showing a state in which the jib 18 is mounted on the boom 16 in the crane 10 according to the present embodiment. FIG. 8D is a cross-sectional view showing the lifting portion 90B (hanging tool) that lifts the jib 18 in the crane 10 according to the present embodiment, and corresponds to a diagram viewed from the viewpoint AA in FIG. 8A. The present embodiment differs from the third embodiment in the lifting structure of the jib 18, and therefore, the following description will focus on the differences.

  As shown in FIG. 8A, the jib hoisting rope 44 is wound a plurality of times between the sheave block 47 of the rear strut 21 and the sheave block 48 of the front strut 22. Further, in the present embodiment, when the jib 18 is attached, the tip of the jib hoisting rope 44 is fixed to a rope fixing portion 44Q provided on the tip side of the rear strut 21 (connection step). As a result, the front strut 22 rotates so as to approach the rear strut 21 in conjunction with the hoisting operation of the jib hoisting winch 32. Further, a jib guy line 28 is hung down from the tip of the front strut 22. The jib guy line 28 functions as the rope of the present invention.

  As a first step of mounting the jib 18, in a state where the boom 16 pivotally supported by the revolving unit 12 is laid down on the ground, the jib foot 18S of the jib 18 is moved to a predetermined position in the horizontal direction with respect to the jib pivot 16P of the boom 16. The jib 18 is arranged on the ground so as to be arranged at intervals (FIG. 8A) (jib preparation step).

  As a second step of attaching the jib 18, the operator prepares the lifting section 90B (hanging tool) (hanging tool preparing step). With reference to FIG. 8D, the lifting unit 90B further includes a cylinder 94 in addition to the lifting unit 90 according to the first embodiment. The cylinder 94 is a known hydraulic cylinder, and its length is adjustable. The upper end of the lifting section 90B is connected to the jib guy line 28, and the shackle 93 of the lifting section 90B is connected to the lower frame 18L of the jib 18 (connection step). In the present embodiment, the jib guy line 28 suspended from the front end side of the front strut 22 forms a part of the hanging tool. With the above-described configuration, the hanger 90 </ b> B rises as the front strut 22 rotates with respect to the rear strut 21.

  As a third step of attaching the jib 18, the operator performs a hoisting operation of the jib hoisting winch 32 to wind up the jib hoisting rope 44. As a result, the front strut 22 rotates so as to approach the rear strut 21 (arrow D81 in FIG. 8B). Then, the jib 18 moves while the lifting portion 90B lifts the base end side of the jib 18 until the jib foot 18S of the jib 18 reaches the jib shaft support 16P of the boom 16 (moving step). Also at this time, since the wheel 18R rolls on the ground, the movement of the jib 18 by the lifting portion 90B is smoothly realized.

  Also in the present embodiment, the connecting portion of the lifting portion 90B to the jib 18 is disposed at a position horizontally away from the sheave block 48 of the front strut 22 by a distance L (FIG. 8B). For this reason, when the jib hoisting rope 44 is hoisted, the lifting portion 90 </ b> B pivots around the vicinity of the sheave block 48 of the front strut 22, thereby lifting the jib 18 and moving in the horizontal direction. .

  In the present embodiment, the length of the jib guy line 28 hanging down from the tip of the front strut 22 does not change even when the winding operation of the jib hoisting winch 32 is performed. For this reason, the vertical movement amount of the jib 18 may be difficult to adjust. Even in such a case, in the present embodiment, the lifting portion 90 </ b> B includes the cylinder 94. For this reason, as a fourth step of attaching the jib 18, the operator moves the jib 18 by the winding operation of the jib hoisting winch 32, and then expands and contracts the cylinder 94, whereby the jib shaft support 16P of the boom 16 is moved. The position of the jib foot 18S of the jib 18 is adjusted with respect to (the adjustment step). Therefore, the jib foot 18S can be accurately aligned with the jib shaft support 16P.

  Thereafter, as a fifth step of mounting the jib 18, the operator fixes the jib foot 18S to the jib shaft support 16P by inserting a pin (not shown) into the jib shaft support 16P and the jib foot 18S (FIG. 8C). Process). As a result, the jib 18 is rotatably supported by the boom 16. Thereafter, the worker removes the lifting portion 90B from the jib 18 and the jib guy line 28. The lower end of the jib guy line 28 is attached to the tip of the jib 18 (FIG. 1).

  Also in this embodiment, the jib 18 is detached from the boom 16 through the same steps as in the third embodiment.

  As described above, also in the present embodiment, the jib 18 can be attached to the boom 16 by using the driving force of the jib hoisting winch 32 of the crane 10. Therefore, the necessity of preparing another auxiliary crane for mounting the jib 18 is reduced. Further, the space required for attaching the jib 18 is reduced, and the time and labor required for the preparation for assembly are reduced. In the present embodiment, the lifting section 90B is connected to the jib guy line 28. For this reason, the jib hoisting rope 44 is wound up by the hoisting force of the jib hoisting winch 32, and the hoisting portion 90B can hoist the jib 18. Further, the jib 18 can be attached by using the jib hoisting winch 32, the jib hoisting rope 44, and the jib guy line 28 which are provided for rotating and raising and lowering the jib 18 when the crane 10 is used. . Note that, in other embodiments, the shackle 93 of the lifting portion 90B may be connected to the upper frame 18T of the jib 18, as in the second embodiment.

  Next, a method of attaching the jib 118 according to the fifth embodiment of the present invention will be described with reference to FIGS. 9A to 10C. FIGS. 9A to 9C are process diagrams showing a state in which the jib 118 is mounted on the boom 116 in the crane 110 according to the present embodiment. FIGS. 10A to 10C are process diagrams showing a state in which the jib 118 is detached from the boom 116 in the crane 110.

  The crane 110 according to the present embodiment has a different structure from the crane 10 according to the first embodiment. The structure of the crane 110 will be described with reference to FIG. 9A. The crane 110 includes a revolving unit 112, a traveling unit 114, a boom 116, and a jib 118. In FIG. 9A, the boom 116 pivotally supported by the revolving unit 112 is laid down on the ground for mounting the jib on the crane 110. In the present embodiment, the jib 118 is fixed at a predetermined ground angle when the crane 110 is in use (fixed jib). Further, the crane 110 includes a mast 120, a strut 122, a backstop 123, a boom hoisting winch 132, a main winding winch 134, a boom hoisting rope 138, a main winding rope 150, a guy link 167, , Is provided.

  The boom raising and lowering rope 138 is wound between sheaves provided at the rear end of the revolving unit 112 and the rotating end of the mast 120, respectively. The mast 120 is rotated by the boom hoisting winch 132 winding up and extending the boom hoisting rope 138. The tip of the mast 120 and the tip of the boom 116 are connected by a guy link 167. Accordingly, the rotation of the mast 120 causes the boom 116 to rotate (undulate). The back stop 123 supports the boom 116 from below, and prevents the boom 116 from falling backward.

  The strut 122 is rotatably supported on the distal end side of the boom 116 at a position on the rear side of the jib 118. When the crane 110 is in use, the rotational position of the strut 122 is fixed. The strut 122 supports the jib 118 by being connected to the jib 118 by a guy line 118G (FIG. 9C). The strut 122 includes a main winding guide sheave 153 at a substantially central portion in the longitudinal direction.

  The main winding winch 134 is disposed on the revolving unit 112. The main winding rope 150 pulled out from the main winding winch 134 is hung on the main winding guide sheave 153, hung on a sheave (not shown) arranged at the tip of the jib 118, and then hung. A hook (not shown) is provided at the tip of the main winding rope 150.

  Also in the crane 110 having such a configuration, the attachment of the jib 118 to the boom 116 is realized in the following steps.

  As a first step of mounting the jib 118, the jib foot 118S of the jib 118 is moved to a predetermined position in the horizontal direction with respect to the jib shaft support portion 116P of the boom 116 in a state where the boom 116 pivotally supported by the revolving body 112 lays down on the ground. The jib 118 is placed on the ground so as to be spaced apart (FIG. 9A) (jib preparation step).

  As a second step of attaching the jib 118, the operator prepares the lifting section 90 (hanging tool) (hanging tool preparing step). The lifting unit 90 according to the present embodiment has the same structure as that of the first embodiment (FIG. 2D). The upper end of the lifting balance 91 of the lifting section 90 is connected to a main winding rope 150 (rope) suspended from the main winding guide sheave 153 (FIG. 9B). In addition, a pair of shackles 93 (FIG. 2D) provided at the lower end of the hanging rope 92 are connected to both ends of a lower frame (lower portion) (not shown) of the jib 118 (connection step). As a result, the lifting section 90 allows the jib 118 to be lifted.

  As a third step of attaching the jib 118, the operator performs a winding operation of the main winding winch 134 to wind the main winding rope 150. Then, while lifting the base end side of the jib 118 by the lifting portion 90, the jib 118 is moved until the jib foot 118S of the jib 118 reaches the jib shaft support portion 116P of the boom 116 (arrow D91 in FIG. 9B) (moving step). At this time, the wheel 118R of the jib 118 rolls on the ground. For this reason, the movement of the jib 118 by the lifting unit 90 is smoothly realized.

  In the present embodiment, the connection of the lifting portion 90 to the jib 118 is also located at a predetermined horizontal distance from the main winding guide sheave 153 of the front strut 122. For this reason, when the main winding rope 150 is hoisted, the lifting portion 90 is rotated around the main winding guide sheave 153 as a fulcrum, whereby the lifting and the horizontal movement of the jib 118 are stably realized.

  As a fourth step of attaching the jib 118, the worker fixes the jib foot 118S to the jib shaft support 116P by inserting a pin (not shown) into the jib shaft support 116P and the jib foot 118S (FIG. 9C) (fixing step). . In this embodiment, since the jib 118 is fixed, the length of the strut 122 is shorter than the length of the rear strut 21 and the front strut 22 (FIG. 1) according to the first embodiment. For this reason, the turning radius of the main winding rope 150 (the hoisting portion 90) with the main winding guide sheave 153 disposed at the center of the strut 122 as a fulcrum is small. Accordingly, the horizontal movement amount of the jib 118 may not be sufficiently secured by simply winding the main winding rope 150 in some cases. In such a case, after the jib 118 is lifted by the winding of the main winding rope 150, the traveling body 114 including the revolving body 112 may run on the jib 118 side (arrow D92 in FIG. 9C). Further, the positioning of the jib foot 118S with respect to the jib shaft support 116P may be finely adjusted by winding and unwinding the main winding rope 150 by the main winding winch 34. Thereafter, the worker removes the lifting section 90 from the jib 118 and the main winding rope 150. Further, the main winding rope 150 is hung on a sheave (not shown) on the tip side of the jib 118.

  With reference to FIGS. 10A to 10C, an operation (disassembly operation) of detaching the jib 118 from the boom 116 will be described. Referring to FIG. 10A, as a first step of disassembly of jib 118, a pin (not shown) fixing jib shaft support 116P and jib foot 118S is pulled out by an operator.

  As a second step of disassembly of the jib 118, the operator unwinds (rolls down) the main winding rope 150 with the main winding winch 134 and lowers the jib 118 on the ground (arrow D101 in FIG. 10B, FIG. 10C).

  As a third step of disassembling the jib 118, the operator further draws out the main winding rope 150 by the main winding winch 134 and relaxes the main winding rope 150. Then, the lifting unit 90 is removed from the main winding rope 150, and the lifting unit 90 is removed from the jib 118.

  As described above, in the present embodiment, the jib 118 can be attached to the boom 116 by using the driving force of the main winding winch 134 of the crane 110. Therefore, the necessity of preparing another auxiliary crane for mounting the jib 118 is reduced. Further, the space required for attaching the jib 118 is reduced, and the time and labor required for the preparation for assembly are reduced. In the present embodiment, the lifting section 90 is connected to the main winding rope 150. For this reason, the main winding rope 150 is wound up by the hoisting force of the main winding winch 134, and the hoisting section 90 can hoist the jib 118. Further, the jib 118 can be attached using the main winding winch 134 and the main winding rope 150 installed for lifting the object to be lifted when the crane 110 is used. Further, since the lifting section 90 is connected to the lower frame of the jib 118, the lifting section 90 can stably lift the long jib 118. Note that in other embodiments, the lifting section 90 may be connected to an upper frame (not shown) of the jib 118 (see FIG. 4D).

  The method of attaching the jibs 18, 118 of the cranes 10, 110 according to each embodiment of the present invention has been described above. Note that the present invention is not limited to these embodiments. The crane according to the present invention only needs to have a predetermined boom, jib, and strut. Further, in the present invention, the following modified embodiments are possible.

  (1) In the first, second and fifth embodiments described above, the main winding ropes 50 and 150 have been described as lifting the jib 18 and 118, but the present invention is not limited to these. The jib 18, 118 may be lifted by the auxiliary winding rope 60 provided separately from the main winding ropes 50, 150.

  (2) In the above embodiment, the lifting parts 90, 90A, and 90B have been described as the lifting tools for lifting the jib 18 and the jib 118, but the present invention is not limited to these. The hoist that can be connected to the driving source of the cranes 10 and 110 and that can lift the jib may have another structure.

10, 110 Crane 10S Strut 12, 112 Slewing body (crane body)
16, 116 Boom 16P, 116P Jib shaft support (shaft support)
18, 118 Jib 18L Lower frame (lower part)
18R, 118R Wheels 18S, 118S Jib foot (supported part)
18T Upper frame (upper part)
20 box mast 21 rear strut 22 front strut (strut)
28 Guy line for jib 30 Winch for mast undulation 32 Winch for jib undulation 34, 134 Main winch 36 Winch for auxiliary winding 38 Mast undulation rope 44 Jib undulation rope 47 Sheave block 48 Sheave block (sheave)
50, 150 Main winding rope 53, 153 Main winding guide sheave (sheave)
57 Main hook 65 Lattice mast 65S Mast foot 66, 132 Boom hoisting winch 67, 167 Guy link 68, 138 Boom hoisting rope 90, 90A, 90B Lifting part (hanging tool)
91 Suspended Balance 92 Suspended Rope 93 Shackle 94 Cylinder 120 Mast 122 Strut M1 First Pedestal M2 Second Pedestal

Claims (6)

The crane body,
A boom rotatably supported by the crane body on the proximal end side and having a pivotal support on the distal end side;
A jib having a pivotally supported portion rotatably supported by the pivotally supported portion of the boom,
A strut for supporting the jib by being connected to the jib and supporting the jib, the strut being provided at a position on the rear side of the jib at a position on the rear side of the jib, the strut being provided with a first sheave as the sheave A front strut rotatably supported on the distal end side of the boom at a rear side position, and a second sheave as the sheave, and pivoting toward the distal end side of the boom at a position further rearward of the front strut. A rear strut that is supported, and a strut including
By connecting the tip side of the front strut and the tip side of the jib, a guy line that integrally rotates the front strut and the jib with respect to the rear strut,
Winches and
A rope pulled out of the winch and hung on the sheave of the strut;
A crane having a jib mounting method for mounting the jib to the boom,
In a state where the boom supported by the crane body is laid down on the ground, the supported portion of the jib is arranged at a predetermined interval in a horizontal direction with respect to the support portion of the boom. A jib preparation step of disposing the jib on the ground;
A suspender preparation step of preparing a suspender for lifting the proximal end side of the jib,
A connecting step of connecting the suspending device to the rope so that the suspending device rises in conjunction with a winding operation of the rope by the winch, and connecting the suspending device to a base end side of the jib;
A moving step of moving the jib while lifting the base end side of the jib by the winch hoisting operation until the pivoted support portion of the jib reaches the pivot support portion of the boom;
A fixing step of fixing the supported portion of the jib to the supported portion of the boom,
Have a,
The connecting step includes:
The rope pulled out of the winch is connected to the second sheave of the rear strut and the first strut of the front strut so that the front strut rotates relative to the rear strut in conjunction with the winch hoisting operation. After winding a plurality of times between the sheave and a step of fixing at a predetermined fixed position,
A step of hanging the guy line from the tip side of the front strut,
Connecting the hanging tool to the tip of the suspended guy line so that the hanging tool rises with the rotation of the front strut with respect to the rear strut;
Including
The crane characterized in that in the moving step, the rope is hoisted by the winch hoisting operation, and the front end of the jib is hoisted by the hoist while the front strut is rotated with respect to the rear strut. Jib mounting method. In the connecting step, the hanging member is connected to a tip portion of the rope suspended from the sheave of the strut,
The jib mounting method according to claim 1, wherein, in the moving step, a base end side of the jib is hoisted by the hoist while the rope is hoisted by the winch hoisting operation. In the hanging tool preparation step, further prepare an extendable cylinder connected to the hanging tool,
After moving the jib in the moving process, according to claim 1 which is stretchable said cylinder, characterized by further comprising an adjusting step of adjusting the position of the shaft support of the jib with respect to the shaft support of the boom Or the jib mounting method of the crane according to 2 . The jib mounting method for a crane according to any one of claims 1 to 3 , wherein, in the hanging tool preparing step, the hanging tool is connected to an upper surface of the jib arranged on the ground. The jib mounting method for a crane according to any one of claims 1 to 3 , wherein, in the hanging tool preparing step, the hanging tool is connected to a lower surface of the jib disposed on the ground. In the jib preparation step, further prepare a wheel mounted on the tip of the jib and rollable on the ground,
The crane jib according to any one of claims 1 to 5 , wherein, in the moving step, the base end side of the jib is lifted, and the jib is moved while rolling the wheel on the ground. Mounting method.

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