JP2019182568A - Crane and assembling method of crane - Google Patents

Abstract

To suppress an unnecessary moment being applied to a crane and to reduce a crane cost by effectively using sheaves between each form for a crane capable of changing to multiple forms.SOLUTION: A crane 10 comprises a revolving superstructure 12, a boom 16, a jib 18, a rear strut 21, a front strut 22, a main winding rope 50, a main winding winch 34 and a sheave unit including a detachable guide sheave 54. In a basic form where the main winding rope is suspended from the tip of the boom 16, while the sheave unit is attached to an upper boom 16T of the boom 16, the sheave unit is attached to the upper jib 18C of the jib 18 in a luffing form (jim boom form) where the main winding rope is suspended from the tip of the jib 18.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a crane and a crane assembling method.

  2. Description of the Related Art Conventionally, a mobile crane is known that includes a lower traveling body, an upper swing body, and a undulating member. The hoisting member is supported by the upper rotating body so as to be able to hoist around a horizontal rotation center axis.

  Patent Document 1 discloses a crane in which a boom as a hoisting member is mounted on an upper swing body. The crane further includes a main winding winch, an idler sheave, a boom point sheave, a main winding rope, and a hook. The main winding winch is provided in the upper swing body. The idler sheave is rotatably supported on the back side of the tip of the boom. Further, the boom point sheave is rotatably supported on the front side of the tip of the boom. After the main winding rope drawn out from the main winding winch is hung on the idler sheave, it is hung between the boom point sheave and the sheave of the sheave block provided on the hook for hanging load. When the main winding winch winds or unwinds the main winding rope, the hook hanging from the tip of the boom is wound and lowered.

  When a configuration in which the hook is suspended from a higher position than a crane (basic form) provided with a hook suspended from the tip of the boom as described above is required, the luffing form or the The form of the crane is changed to the long form. In the luffing configuration, the jib is connected to the tip of the boom so as to be raised and lowered, and the hook is suspended from the tip of the jib via the main winding rope. In the long form, at least a part of the boom and at least a part of the jib are connected to each other to form a long boom, and the hook is suspended from the tip of the long boom via the main winding rope. Is done.

JP 2008-37535 A

  In the crane configured as described above, when the crane configuration is changed from the basic configuration in which the hook is suspended from the tip of the boom to the luffing configuration or the long configuration, a member that is not used in the predetermined configuration is generated, and the cost of the crane is increased. There was a problem that would increase. Specifically, the idler sheave provided at the tip of the boom in the basic crane form is not required in the luffing form or the long form. On the other hand, in the luffing form, another idler sheave is provided at the tip of the jib. In the long form, another idler sheave is provided at the tip of the long boom. Therefore, since the idler sheave used in each form is individually provided, the cost of the crane increases.

  In the above configuration, since the idler sheave is also provided at the tip of the boom, in the luffing form, the crane falls forward by the amount of the idler sheave during the hanging work or the self-supporting / lowering work. There was a problem that the moment applied to the direction increased.

  The present invention has been made in view of the above problems, and in a crane that can be changed into a plurality of forms, the effective use of sheaves between the forms reduces the cost of the crane and an unnecessary moment for the crane. The purpose is to deter from being granted.

  A crane according to an aspect of the present invention includes a crane main body, a boom pivotally supported by the crane main body, a jib pivotally supported by the tip of the boom, and hoisting and winding of a suspended load. A suspended load rope for lowering, a suspended load winch for winding and unwinding the suspended load rope, a sheave capable of supporting the suspended load rope, and a bracket for rotatably supporting the sheave. A sheave unit including: a first unit holding unit disposed at a distal end portion of the boom, wherein the jib is detached from the boom and the hanging rope is suspended from the distal end portion of the boom. In the basic form of the present invention, the hanging rope pulled out from the hanging winch is supported by the sheave and suspended from the tip of the boom. A first unit holding part capable of holding the sheave unit and a second unit holding part disposed at the tip of the jib, wherein at least a part of the jib including the tip is at least The hanging load rope pulled out from the hanging load winch is supported by the sheave in the jib boom configuration of the crane, which is attached to a part of the boom and the hanging rope is suspended from the tip of the jib. And a second unit holding part capable of holding the sheave unit so as to be suspended from the tip of the jib, and the sheave unit includes the first unit holding part and the second unit holding part. Is selectively attached to and detached from the unit.

  According to this configuration, the crane can be changed between a basic configuration in which a hanging load rope is suspended from the tip of the boom and a jib boom configuration in which the hanging rope is suspended from the tip of the jib. It is said. The crane includes a sheave unit including a sheave, a first unit holding portion that is arranged on the boom and can hold the sheave unit, and a second unit holding portion that is arranged on the jib and can hold the sheave unit. When the crane is set to the basic form, the sheave unit is held by the first unit holding portion, so that the sheave can support the hanging load rope at the tip of the boom. On the other hand, when the crane is set in the jib boom form, the sheave unit can be supported by the second unit holding portion so that the sheave can support the suspended load rope at the tip end portion of the jib. Therefore, compared to other cranes in which individual sheaves are rotatably held at the tip of the boom and the tip of the jib in order to support the hanging rope in the two forms of the basic form and the jib boom form. The cost of the crane can be reduced. Further, in the jib boom configuration, since the sheave unit is not mounted on the first unit holding portion, it is possible to prevent an unnecessary moment from being applied to the tip portion of the boom.

  In the above configuration, the bracket of the sheave unit is a pair of sheave support portions that support the sheave so as to be rotatable around a predetermined first rotation axis, and the pair of sheave support portions includes: A bracket first hole disposed at a position spaced from the first rotation axis in the radial direction in rotation of the sheave; and a position spaced from the first rotation axis in the radial direction. A pair of sheave support portions, and a pair of sheaves, each of which is open to a bracket second hole portion that is disposed at a position spaced from the bracket first hole portion in the rotational direction of the sheave. The support portion is fixed to a portion on the opposite side of the first rotation shaft from the bracket first hole and the second bracket hole, and can be connected to a predetermined auxiliary lifting device. And a unit positioning part that determines the position of the sheave unit with respect to the specific unit holding part that is at least one of the first unit holding part and the second unit holding part. The specific unit holding portion is a pair of portions to be engaged with the unit positioning portion and a pair of sheave units that are arranged to face the pair of sheave support portions in the axial direction by receiving the sheave unit. A pair of holding portion side support portions, the pair of holding portion side support portions arranged to match the pair of bracket first hole portions in the axial direction. And a pair of holding portion side second holes arranged so as to match the pair of bracket second holes in the axial direction, respectively, The unit positioning portion is engaged with the engaged portion of the specific unit holding portion in a state where the lifting portion is connected to the auxiliary lifting device and the sheave unit is lifted, and the sheave unit moves the unit positioning portion When the rotary shaft is rotated about the second rotation axis parallel to the first rotation shaft, the bracket first hole portion matches the holding portion side first hole portion and the bracket second hole portion is held on the holding portion side first. While the distance between the unit positioning part and the bracket first hole part and the distance between the engaged part and the holding part side first hole part are set to be the same so as to match the two hole parts, It is desirable that the distance between the bracket first hole and the bracket second hole and the distance between the holding part side first hole and the holding part side second hole are set to be the same.

  According to this configuration, the sheave unit can be easily attached and fixed to the specific unit holding portion which is at least one of the first unit holding portion and the second unit holding portion. Specifically, the sheave unit is lifted in a state where an auxiliary lifting device such as an auxiliary crane is connected to the lifted portion of the sheave unit. Then, when the unit positioning portion of the sheave unit is engaged with the engaged portion of the specific unit holding portion and the sheave unit is rotated around the second rotation axis, the pair of bracket first holes become the pair of holding portions. The pair of bracket second holes coincides with the pair of holding part side second holes while matching the side first holes. For this reason, the operator can easily fix the sheave unit to the specific unit holding portion by inserting the connecting pin into each matched hole.

  In the above configuration, in a state where the jib or the boom is placed on the ground, the holding unit side first hole of the specific unit holding unit is spaced above the holding unit side second hole. It is desirable that the engaged portion is disposed adjacent to the holding portion side first hole so that the unit positioning portion can be supported from below.

  According to this configuration, when the unit positioning portion of the sheave unit is engaged with the engaged portion of the specific unit holding portion, the auxiliary lifting device lowers the sheave unit so that the sheave unit is moved by its own weight. It can be rotated around two rotation axes. Therefore, the sheave unit can be more easily fixed to the specific unit holding portion.

  In the above configuration, the unit positioning portion is disposed so as to extend parallel to the first rotation shaft between the first rotation shaft and the first bracket hole and to connect the pair of sheave support portions to each other. Preferably, the engaged portion has a hook shape capable of holding the positioning pin from below.

  According to this configuration, the sheave unit can be easily rotated around the second rotation axis by engaging the positioning pin with the engaged portion having the hook shape.

  In the above configuration, the boom can be divided into an upper boom including the first unit holding portion and disposed at an upper end portion of the boom, and a plurality of boom members positioned below the upper boom, The jib can be divided into an upper jib that includes the second unit holding portion and is positioned at the upper end of the jib and a plurality of jib members that are positioned below the upper jib, and the second unit holding portion is A main boom disposed on the upper jib and configured to include at least a part of the plurality of boom members and the upper jib is connected to the crane body so as to be raised and lowered, and is positioned at an upper end of the main boom. In the main boom form of the crane in which the hanging rope is suspended from the tip of the upper jib, the crane is pulled out from the hanging winch. Ri it is desirable to load rope holds the sieve unit to be suspended from the upper jib tip of the main boom while being supported by the sheave.

  According to this configuration, the crane can be further changed in form among the basic form, the jib boom form, and the main boom form. When the crane is set to the main boom form, the sheave unit is held by the second unit, so that the sheave can support the hanging load rope at the tip of the main boom. Therefore, in order to support the suspended load rope in the three forms of the basic form, the jib boom form, and the main boom form, another crane in which individual sheaves are rotatably held at the tip part of the boom and the tip part of the jib. Compared with, the cost of the crane can be reduced.

  A crane assembly method according to another aspect of the present invention includes a crane main body, a boom pivotally supported on the crane main body, a jib pivotally supported on the tip of the boom, A method for assembling a crane, comprising: a suspended load rope for lifting and hanging a suspended load; and a suspended load winch for winding and unwinding the suspended load rope. A first unit holding part arranged at the tip of the jib and a second unit holding part arranged at the tip of the boom, including a sheave that can support the sheave and a bracket that rotatably supports the sheave A detachable sheave unit, attaching the sheave unit to the first unit holding portion, attaching the boom to the crane body, and By guiding the suspended rope pulled out from the inch by the sheave of the sheave unit mounted on the first unit holding section, and by hanging the suspended rope from the tip of the boom, A basic crane assembling step, wherein at least a part of the boom is mounted on the crane body, the sheave unit is mounted on the second unit holding portion, and at least a part of the jib is mounted on the boom. The suspension load rope pulled out from the suspension load winch is guided by the sheave of the sheave unit mounted on the second unit holding portion, and the suspension load rope is guided from the tip of the jib. A jib boom crane assembling step for making the crane into a jib boom form by hanging down.

  According to this method, a crane can be made into the basic form in which the hanging rope is suspended from the tip of the boom and the jib boom in which the hanging rope is suspended from the tip of the jib. When setting the crane to the basic form, the hanging rope can be supported by the sheave at the tip of the boom by holding the sheave unit in the first unit holding portion. On the other hand, when the crane is set in the jib boom configuration, the hanging rope can be supported by the sheave at the tip of the jib by holding the sheave unit in the second unit. Therefore, compared to other crane assembly methods in which individual sheaves are rotatably held at the tip of the boom and the tip of the jib in order to support the suspended rope in the two forms of the basic form and the jib boom form. Thus, the cost of the crane can be reduced. Further, in the jib boom configuration, since the sheave unit is not mounted on the first unit holding portion, it is possible to prevent an unnecessary moment from being applied to the tip portion of the boom.

  The above method further includes a main crane assembling step for making the crane into a main boom configuration, and the main crane assembling step includes an upper boom disposed at an upper end portion of the boom, and an upper boom than the upper boom. A boom dividing step of dividing into a plurality of boom members positioned below, the jib including the second unit holding portion, an upper jib positioned at the upper end of the jib, and positioned below the upper jib A jib splitting step for splitting into a plurality of jib members, at least a part of the plurality of boom members and the upper jib are connected, and is a main boom that is longer than the boom and is attached to the tip of the main boom Assembling the main boom such that the upper jib is disposed; and the hanging load rope pulled out from the hanging load winch Guided by the sheave of the sheave unit mounted on the two-unit holding part, the main boom is attached to the crane body so that the hanging rope is suspended from the tip of the upper jib included in the main boom. And a step of mounting in a undulating manner.

  According to this method, a crane can be made into a basic form, a jib boom form, and a main boom form. When the crane is set to the main boom configuration, the hanging rope can be supported by the sheave at the tip of the main boom by holding the sheave unit in the second unit. Therefore, in order to support the suspended load rope in the three forms of the basic form, the jib boom form, and the main boom form, assembling other cranes that rotatably hold individual sheaves at the tip part of the boom and the tip part of the jib Compared with the method, the cost of the crane can be reduced.

  According to the present invention, in a crane capable of changing its form to a plurality of forms, it is possible to reduce the cost of the crane by effectively utilizing the sheave between the forms and to prevent an unnecessary moment from being applied to the crane. Can do.

It is a side view of the 1st form (jib boom form) of the crane concerning one embodiment of the present invention. It is a side view of the 2nd form (basic form) of the crane concerning one embodiment of the present invention. It is a side view of the upper boom of the crane concerning one embodiment of the present invention. It is the side view which showed the mounting procedure of the idler sheave of the crane which concerns on one Embodiment of this invention. It is the side view which showed the mounting procedure of the idler sheave of the crane which concerns on one Embodiment of this invention. It is the side view which showed the mounting procedure of the idler sheave of the crane which concerns on one Embodiment of this invention. It is a perspective view of the 1st unit holding part of the crane concerning one embodiment of the present invention. It is a perspective view of the sheave unit of the crane concerning one embodiment of the present invention. It is a perspective view which shows a mode that the sheave unit was mounted | worn with the 1st unit holding | maintenance part of the crane which concerns on one Embodiment of this invention. It is the side view which showed the mounting procedure of the idler sheave of the crane which concerns on one Embodiment of this invention. It is a side view of the upper jib of the crane concerning one embodiment of the present invention. It is a side view of the 3rd form (main boom form) of the crane concerning one embodiment of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Drawing 1 is a side view of the 1st form (crane 10A) of crane 10 concerning one embodiment of the present invention. The crane 10A shown in FIG. 1 corresponds to a so-called luffing form (also called a jib boom form). In the following, in each drawing, directions of “up”, “down”, “front”, and “rear” are shown. The directions indicate the structure and the assembly method of the crane 10 according to the present embodiment. It is shown for the sake of explanation, and does not limit the moving direction or usage of the crane according to the present invention. Moreover, the crane 10 which concerns on this embodiment can change into the 2nd form (crane 10B of a basic form) and a 3rd form (crane 10C of a long form) which are mentioned later by rearranging a part of member. it can.

  The crane 10 includes a swing body 12 corresponding to a crane body, a traveling body 14 that supports the swing body 12 so as to be swingable, a hoisting member including a boom 16 and a jib 18, and a mast 20 that is a boom hoisting member. Is provided. A counterweight 13 for adjusting the balance of the crane 10 is loaded on the rear part of the revolving structure 12. Further, a cab 15 is provided at the front end of the revolving structure 12. The cab 15 corresponds to the driver seat of the crane 10.

  The boom 16 shown in FIG. 1 is pivotally supported by the revolving structure 12 so as to be raised and lowered. The boom 16 is a so-called lattice type, and includes a lower boom 16A, one or more (two in the illustrated example) intermediate booms 16B, 16C, and 16D, and an upper boom 16T. Specifically, the lower boom 16 </ b> A is connected to the front portion of the revolving structure 12 so as to be rotatable in the undulation direction. The intermediate booms 16B, 16C, and 16D are detachably added to the distal end side of the lower boom 16A in that order. The upper boom 16T is detachably connected to the distal end side of the intermediate boom 16D, and a rear strut 21 and a front strut 22 for rotating the jib 18 are rotatably connected to the distal end portion of the upper boom 16T. The boom 16 is pivotally supported by the revolving unit 12 so as to be rotatable about a horizontal rotation center axis with a boom foot pin 16S provided at the lower end as a fulcrum.

  However, the specific structure of the boom is not limited in the present invention. For example, the boom may have no intermediate member, or may have a different number of intermediate booms from the above. Further, the boom may be constituted by a single member.

  Although the specific structure of the jib 18 is not limited, it has a lattice structure in the illustrated example. The jib 18 is pivotally supported at the tip end portion of the boom 16 so as to be raised and lowered. The base end portion of the jib 18 is pivotally connected (supported) to the jib support portion 16W of the upper boom 16T of the boom 16, and the rotation central axis of the jib 18 is a boom with respect to the revolving body 12. The horizontal axis is parallel to the 16 rotation center axis (boom foot pin 16S).

  The jib 18 includes a lower jib 18A, one or more (one in the illustrated example) intermediate jib 18B, and an upper jib 18C. Specifically, the lower jib 18A is coupled to a jib support portion 16W disposed on the upper boom 16T of the boom 16 so as to be rotatable in the undulation direction. The intermediate jib 18B is detachably added to the distal end side of the lower jib 18A. The upper jib 18C is detachably added to the distal end side of the intermediate jib 18B.

  The mast 20 has a base end and a rotation end, and the base end is rotatably connected to the revolving body 12. The rotation axis of the mast 20 is parallel to the rotation axis of the boom 16 and is located immediately behind the rotation axis of the boom 16. In other words, the mast 20 can be rotated in the same direction as the direction in which the boom 16 is raised and lowered. On the other hand, the rotating end of the mast 20 is connected to the tip of the boom 16 via a pair of left and right boom guy lines 24. This connection links the rotation of the mast 20 with the rotation of the boom 16.

  A pair of left and right backstops 23 are provided on the revolving structure 12. These backstops 23 abut against the left and right sides of the lower boom 16A of the boom 16 when the boom 16 reaches the standing posture shown in FIG. By this contact, the boom 16 is restricted from being beaten rearward by a strong wind or the like. In another embodiment, the pair of left and right backstops 23 are provided on the lower boom 16A, and contact the left and right sides of the revolving structure 12 when the boom 16 reaches the standing posture shown in FIG. But you can.

  The rear strut 21 and the front strut 22 are pivotally supported by the tip end portion (upper boom 16T) of the boom 16 so as to be rotatable. The rear strut 21 is disposed at a position behind the front strut 22. The rear strut 21 is held in a posture that projects from the tip of the upper boom 16T to the boom standing side (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 intermediate boom 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 lower boom 16A of the boom 16, and the position of the rear strut 21 is regulated by the tension. In another embodiment, the rear strut 21 and the front strut 22 may be pivotally supported on the base end portion of the jib 18 so as to be rotatable. Alternatively, the rear strut 21 may be pivotally supported on the distal end portion of the boom 16, and the front strut 22 may be pivotally supported on the proximal end portion of the jib 18.

  The front strut 22 is pivotally supported at the tip of the boom 16 at the rear of the jib 18 and is coupled to the jib 18 so as to rotate (integrally) with the jib 18. Specifically, a pair of left and right jib guy lines 28 are stretched so as to connect the front end portion of the front strut 22 and the front end portion of the jib 18. Accordingly, the jib 18 is also rotationally driven by the rotational driving of the front strut 22. The rear strut 21 described above forms a substantially isosceles triangular shape with the front strut 22.

  Various winches are mounted on the crane 10. Specifically, a boom hoisting winch 30 for raising and lowering the boom 16, a jib hoisting winch 32 for rotating the jib 18 in the hoisting direction, and a main winding for lifting and lowering a suspended load. A winch 34 is mounted. In the crane 10 according to this embodiment, the boom hoisting winch 30 is installed in the vicinity of the proximal end of the mast 20. Further, the jib hoisting winch 32 and the main winding winch 34 are installed on the lower boom 16 </ b> A of the boom 16. These winches 30, 32, and 34 may be mounted on the revolving structure 12.

  The boom hoisting winch 30 winds and unwinds the boom hoisting rope 38. The boom hoisting rope 38 is routed so that the mast 20 is rotated by the winding and unwinding. 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 mast 20 and the rear end portion of the revolving body 12, respectively, and are pulled out from the boom hoisting winch 30. The boom hoisting rope 38 is hung between the sheave blocks 40 and 42. Therefore, when the boom hoisting winch 30 winds and unwinds the boom hoisting rope 38, the distance between the sheave blocks 40 and 42 changes, and thereby the mast 20 and the boom 16 linked thereto are raised and lowered. Rotate in the direction.

  The jib hoisting winch 32 winds and feeds the jib hoisting rope 44 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 rotates relative to the rear strut 21 by the winding and unwinding. Specifically, a guide sheave 46 is provided in the middle portion in the longitudinal direction of the rear strut 21, and a plurality of sheaves are arranged in the width direction at the rotating end portion of the rear strut 21 and the rotating end portion of the front strut 22, respectively. 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 between the sheave blocks 47 and 48 (between the tip of the rear strut 21 and the tip of the front strut 22). It is passed over to. Therefore, the winding and unwinding of the jib hoisting rope 44 by the jib hoisting winch 32 changes the distance between the sheave blocks 47 and 48 and rotates the front strut 22 and the jib 18 linked thereto in the hoisting direction. .

  The main winding winch 34 performs lifting and lowering of the suspended load by the main winding rope 50 (suspended load rope). With respect to the main winding, main winding guide sheaves 52 and 53 are rotatably provided in the vicinity of the proximal end of the rear strut 21 and the vicinity of the proximal end of the front strut 22, respectively, and the distal end of the jib 18 (upper jib 18C). Is fitted with an idler sheave 54. Further, 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 idler sheave 54. The main winding rope 50 drawn out from the main winding winch 34 is hooked on the main winding guide sheaves 52 and 53 and the idler sheave 54 in order, and the main winding point sheave 56 of the sheave block and the main hook 57 for suspended loads. It spans between the sheave 58 of the sheave block provided on the (hook). Therefore, when the main winding winch 34 (winding winch) winds and feeds the main winding rope 50, the distance between the sheaves 56 and 58 changes, and the main winding suspended from the tip of the jib 18 changes. The main hook 57 connected to the rope 50 is wound up and down.

  Drawing 2 is a side view of the 2nd form (crane 10B) of crane 10 concerning this embodiment. The crane 10 (10A) shown in FIG. 1 is disassembled on the ground, and the crane 10B shown in FIG. The crane 10B corresponds to a so-called basic form.

  In the crane 10B, the jib 18, the rear strut 21, the front strut 22, and the like are not mainly provided in the crane 10A shown in FIG. Moreover, the member (back stop 25, guy link 26) for supporting these members is not equipped.

  In the crane 10 </ b> B shown in FIG. 2, the main winding rope 50 is suspended from the tip end portion (upper boom 16 </ b> T) of the boom 16. Specifically, an idler sheave 54 is rotatably mounted on the back side of the upper boom 16T. A main winding sheave block in which a plurality of main winding point sheaves 16X are arranged in the width direction is provided in the upper boom 16T below the jib support portion 16W and adjacent to the idler sheave 54. ing. The main winding rope 50 drawn from the main winding winch 34 is hung on the idler sheave 54, and the sheave block main sheave point sheave 16X and the sheave block provided on the main hook 57 for suspended loads It is spanned between the sheave 58. Accordingly, when the main winding winch 34 winds and unwinds the main winding rope 50, the distance between the sheaves 16X and 58 changes and the main winding winch 34 is connected to the main winding rope 50 suspended from the tip of the boom 16. The main hook 57 is wound up and down.

  Referring to FIGS. 1 and 2, in this embodiment, idler sheave 54 attached to the tip of jib 18 in crane 10A of FIG. 1 is attached to the tip of boom 16 in crane 10B of FIG. The That is, the idler sheave 54 is selectively attached to the tip of the jib 18 of the crane 10A and the tip of the boom 16 of the crane 10B.

  FIG. 3 is a side view of the upper boom 16T of the crane 10 (10B) according to the present embodiment. In FIG. 3, the upper boom 16T of the crane 10B in FIG. 4 to 6 are side views showing a procedure for mounting the idler sheave 54 of the crane 10B according to the present embodiment. FIG. 7 is a perspective view of the sheave mounting portion 16P of the crane 10B. FIG. 8 is a perspective view of a crane sheave unit 54S according to an embodiment of the present invention. FIG. 9 is a perspective view showing a state in which the sheave unit 54S is mounted on the sheave mounting portion 16P of the crane 10B according to the present embodiment.

  As shown in FIG. 2, in the basic form of the crane 10 (the crane 10 </ b> B), the rear strut 21 and the front strut 22 are detached from the boom 16, and the main winding rope 50 is suspended from the tip of the boom 16. In the crane 10B, the idler sheave 54 is attached to the upper boom 16T. When the boom 16 is disassembled into the lower boom 16A, the intermediate booms 16B to 16D, and the upper boom 16T, the upper boom 16T is disposed on the ground G in a posture as shown in FIG. 3 from the viewpoint of safety. (The posture in which the bottom surface of the upper boom 16T is in contact with the ground G extending in a direction perpendicular to the longitudinal direction of the boom 16).

  The upper boom 16T includes a pair of left and right upper boom frame plates 160, a first boom pipe 161, a second boom pipe 162, and a sheave mounting portion 16P (in addition to the main winding point sheave 16X and the jib support portion 16W described above. First unit holding part).

  The pair of left and right upper boom frame plates 160 are members that respectively define left and right ends of the upper boom 16T. The boom first pipe 161 and the boom second pipe 162 are pipe members that extend in the left-right direction, and connect a pair of left and right upper boom frame plates 160 to each other. The boom first pipe 161 is disposed above the boom second pipe 162. In addition to the boom first pipe 161 and the boom second pipe 162, other pipe materials are arranged to connect the pair of left and right upper boom frame plates 160 to each other.

  The sheave mounting portion 16P is disposed on the boom first pipe 161 and the boom second pipe 162 (the tip portion of the boom 16), and allows the sheave unit 54S to be mounted. Referring to FIGS. 3 and 7, sheave mounting portion 16P has a pair of left and right first fixing portions 161A and a pair of left and right second fixing portions 162A. The sheave mounting portion 16P holds the sheave unit 54S so that the main winding rope 50 pulled out from the main winding winch 34 is supported by the idler sheave 54 and is suspended from the tip end portion of the boom 16 in the crane 10B. .

  The pair of first fixing parts 161 </ b> A are arranged at intervals in the center part in the left-right direction of the boom first pipe 161. The first fixing portion 161A is a plate-like member fixed to the boom first pipe 161 so as to protrude forward and downward in FIG. 3 and FIG. 7 (backward and downward in FIG. 2) from the outer peripheral surface of the boom first pipe 161. It is. The first fixing portion 161A includes a first fixing hole 161B and a pin engaging portion 161C (an engaged portion). The first fixing hole 161B is a circular hole formed so as to penetrate the first fixing portion 161A in the left-right direction in the vicinity of the center portion of the first fixing portion 161A. 161 C of pin engaging parts are arrange | positioned rather than the 1st fixing hole 161B among the 1st fixing | fixed parts 161A, and have a hook shape. The pin engaging portion 161C allows the positioning pin 544 of the sheave unit 54S to engage.

  As shown in FIG. 7, the pair of second fixing portions 162 </ b> A are arranged below the pair of first fixing portions 161 </ b> A with a space therebetween. In addition, the pair of second fixing portions 162 </ b> A are arranged at intervals in the center portion in the left-right direction of the boom second pipe 162. 162 A of 2nd fixing | fixed parts are the plate-shaped members fixed to the boom 2nd pipe 162 so that it might protrude from the outer peripheral surface of the boom 2nd pipe 162 to the front and upper direction of FIG. 3, FIG. 7 (backward and upward in FIG. 2). It is. The second fixing portion 162A has a second fixing hole 162B. The second fixing hole 162B is a circular hole formed so as to penetrate the second fixing portion 162A in the left-right direction in the vicinity of the distal end portion of the second fixing portion 162A. As shown in FIG. 4, a straight line connecting the center of the first fixing hole 161B and the center of the second fixing hole 162B extends along a substantially vertical direction.

  The pair of left and right first fixing portions 161A and the second fixing portion 162A constitute a pair of holding portion side support portions of the present invention. The pair of holding portion side support portions are disposed to face the pair of fixing brackets 54T in the axial direction of the sheave rotation shaft 541 by receiving the sheave unit 54S. Further, the pair of holding portion side support portions have a pair of first fixing hole portions 161B (holding portions) that can be arranged so as to match the pair of bracket first hole portions 542 in the axial direction. Side first hole portion) and a pair of second fixing hole portions 162B (holding portion side second hole portions) that can be disposed so as to match the pair of bracket second hole portions 543 in the axial direction. ) And each are opened.

  On the other hand, referring to FIG. 8, in addition to the aforementioned idler sheave 54, the sheave unit 54S includes a pair of left and right fixing brackets 54T (sheave support portions) that rotatably support the idler sheave 54 and a pair of left and right lifting units. It has a bracket 54W and positioning pins 544 (unit positioning portions). The idler sheave 54 can support the main winding rope 50.

  The pair of fixing brackets 54T support the sheave unit 54S so as to be rotatable about a sheave rotation shaft 541 (a predetermined first rotation shaft). The pair of fixing brackets 54T are substantially V-shaped members, and are arranged at intervals in the left-right direction. A sheave rotating shaft 541 extends in the left-right direction at the bent portion of the pair of fixing brackets 54T so as to connect the pair of fixing brackets 54T to each other. The sheave rotation shaft 541 rotatably supports the idler sheave 54 and serves as a rotation shaft in the rotation of the idler sheave 54. As shown in FIG. 7, the idler sheave 54 supported by the sheave rotating shaft 541 is disposed between a pair of left and right fixing brackets 54T. In addition, a bracket first hole 542 and a bracket second hole 543 are formed at the two distal ends of the V-shaped fixing bracket 54T, respectively. Each of these holes is a circular hole that is opened so as to penetrate the fixing bracket 54T along the left-right direction. The bracket first hole 542 is disposed at a position spaced from the sheave rotation shaft 541 in the radial direction in the rotation of the idler sheave 54. The bracket second hole 543 is arranged at a position spaced from the sheave rotation shaft 541 in the radial direction and at a position spaced from the bracket first hole 542 in the rotation direction of the idler sheave 54. Is done.

  The pair of lifting brackets 54W are fixed to the fixing bracket 54T so as to protrude from the vicinity of the bent portions of the pair of fixing brackets 54T. The lifting bracket 54W is fixed to a portion of the fixing bracket 54T opposite to the bracket first hole 542 and the bracket second hole 543 with respect to the sheave rotation shaft 541. As shown in FIG. 8, a lifting hole 54W1 is opened at the tip of the lifting bracket 54W. The lifting bracket 54W is connected to an auxiliary crane AC (auxiliary lifting device) (FIG. 4) via a lifting hole 54W1.

  The positioning pin 544 extends between the sheave rotation shaft 541 and the bracket first hole 542 so as to connect the pair of left and right fixing brackets 54T to each other, and has a cylindrical shape. When the sheave unit 54S including the idler sheave 54 is mounted on the sheave mounting portion 16P, the positioning pin 544 is engaged with the pin engaging portion 161C. As a result, the idler sheave 54 determines the position of the sheave unit 54S with respect to the sheave mounting portion 16P and the sheave mounting portion 18P (specific unit holding portion).

  Next, with reference to FIG. 4 thru | or FIG. 9, the process in which the crane 10 is set to a basic form is demonstrated. After the sheave unit 54S detached from the sheave mounting portion 18P is mounted on the sheave mounting portion 16P, the boom 16 is mounted on the revolving body 12, and the main winding rope 50 pulled out from the main winding winch 34 is sheaveed. The crane 10 is guided by the idler sheave 54 of the sheave unit 54S mounted on the mounting portion 16P, and the main winding rope 50 is suspended from the tip of the boom 16 to make the crane 10 into a basic form (basic crane assembly process). Next, a preparation process in which the sheave unit 54S is attached to the upper boom 16T of FIG. 3 before the above process will be described.

  As shown in FIG. 4, the rope suspended from the hook of the auxiliary crane AC is connected to the lifting hole 54W1 of the lifting bracket 54W. While the sheave unit 54S is lifted by the auxiliary crane AC, the sheave unit 54S is brought close to the sheave mounting portion 16P of the upper boom 16T. Eventually, as shown in FIG. 5, while the sheave unit 54S is lowered (arrow D1 in FIG. 5), the positioning pins 544 of the sheave unit 54S are engaged with the pair of left and right pin engaging portions 161C from above.

  Further, when the sheave unit 54S is lowered by the auxiliary crane AC, the sheave unit 54S rotates backward with the positioning pin 544 as a fulcrum (arrow D2 in FIG. 5). As a result, as shown in FIGS. 6 and 9, the bracket first hole 542 of the sheave unit 54S and the first fixing hole 161B of the first fixing portion 161A are matched, and the bracket second of the sheave unit 54S. The positions of the hole portion 543 and the second fixing hole portion 162B of the second fixing portion 162A match. Then, the operator inserts the connecting pin S1 into the bracket first hole 542 and the first fixing hole 161B, and inserts the connecting pin S2 into the bracket second hole 543 and the second fixing hole 162B. . As a result, the sheave unit 54S including the idler sheave 54 is mounted and fixed to the sheave mounting portion 16P of the upper boom 16T of the boom 16. In addition, with reference to FIG. 4 (the figure seen from the direction parallel to the sheave rotation shaft 541), as described above, the positions of the holes coincide with each other by the rotation around the positioning pin 544 of the sheave unit 54S. While the distance between the positioning pin 544 and the bracket first hole 542 and the distance between the pin engaging portion 161C and the first fixing hole 161B are set to be the same, the bracket first hole 542 and the bracket second hole The distance between the portion 543 and the distance between the first fixing hole 161B and the second fixing hole 162B are set to be the same.

  When the sheave unit 54S is removed from the upper boom 16T, the connecting pins S1 and S2 are pulled out, and the reverse of the above mounting process is performed in the order of FIGS. 6, 5, and 4. Is done.

  As described above, when the sheave unit 54S including the idler sheave 54 is mounted on the sheave mounting portion 16P of the upper boom 16T, the main winding rope 50 is suspended from the tip of the boom 16 in the crane 10B of FIG. The lifting and lowering work of the suspended load can be performed by the illustrated hook.

  On the other hand, when the crane 10 is changed from the basic form crane 10B shown in FIG. 2 to the luffing form crane 10A shown in FIG. 1, the sheave unit 54S removed from the upper boom 16T is moved to the jib 18. It is mounted on the sheave mounting portion 18P of the upper jib 18C. When assembling the crane 10 in the luffing configuration, the boom 16 is mounted on the revolving structure 12, and the sheave unit 54S detached from the sheave mounting section 16P is mounted on the sheave mounting section 18P, and then the jib 18 and the rear strut are mounted. 21 and the front strut 22 are mounted on the boom 16, the main winding rope 50 drawn from the main winding winch 34 is guided by the idler sheave 54 of the sheave unit 54S mounted on the sheave mounting portion 18P, and the tip end of the jib 18 The crane 10 is made into a luffing form by hanging the main winding rope 50 from the luffing crane assembly process (jib boom crane assembly process). FIG. 10 is a side view showing a procedure for attaching the idler sheave 54 to the upper jib 18C of the crane 10 (10A) according to the present embodiment. FIG. 11 is a side view of the upper jib 18C of the crane 10A according to the present embodiment. FIG. 11 shows a state where the upper jib 18C is laid down on the ground. In the luffing configuration 10 </ b> A, the rear strut 21 and the front strut 22 are attached to the boom 16, and the main rope 50 is suspended from the tip of the jib 18.

  Referring to FIG. 11, the upper jib 18C includes a pair of left and right upper jib first main frames 18X, a pair of left and right upper jib second main frames 18Y, a plurality of upper dibratis 18Z, and a pair of left and right upper jib frame plates. 18W. In FIG. 11, the upper jib first main frame 18X and the upper jib second main frame 18Y on the right side appear. The pair of upper jib first main frame 18X and upper jib second main frame 18Y form a rectangular cross section of the upper jib 18C. That is, the upper jib first main frame 18X and the upper jib second main frame 18Y are disposed at the four corners of the upper jib 18C. The plurality of upper jiburachis 18Z connect the upper jib first main frame 18X and the upper jib second main frame 18Y to each other. The pair of left and right upper jib frame plates 18W are disposed at the tip of the upper jib 18C (the front end of FIG. 11), and connect the tip of the upper jib first main frame 18X and the tip of the upper jib second main frame 18Y. It is a plate-shaped member to be connected. Further, the upper jib 18C includes a main winding point sheave 56, a jib first pipe 181, a jib second pipe 182, and a sheave mounting portion 18P (FIG. 10) (second unit holding portion).

  The main winding point sheave 56 is rotatably supported on the front end side of the pair of left and right upper jib first main frames 18X.

  The jib first pipe 181 and the jib second pipe 182 are pipe members that extend in the left-right direction, and connect the pair of left and right upper jib second main frames 18Y to each other. 11, the jib first pipe 181 is disposed behind the jib second pipe 182, and in FIG. 1, the jib first pipe 181 is disposed below the jib second pipe 182 (FIG. 1). (Not shown). In addition to the jib first pipe 181 and the jib second pipe 182, other pipe materials are arranged to connect the upper jib second main frame 18Y and the upper jib first main frame 18X to each other.

  The sheave mounting portion 18P has the same structure as the sheave mounting portion 16P described above. The sheave mounting portion 18P is disposed on the jib first pipe 181 and the jib second pipe 182 (tip portion of the jib 18), and allows the sheave unit 54S to be mounted (FIG. 10). In the luffing configuration 10A of the crane 10, the sheave mounting portion 18 </ b> P is configured so that the main winding rope 50 drawn out from the main winding winch 34 is supported by the idler sheave 54 and is suspended from the tip of the jib 18. 54S is held. Referring to FIG. 10, sheave mounting portion 18P has a pair of left and right first fixing portions 181A and second fixing portions 182A. In FIG. 10, a first fixing portion 181A and a second fixing portion 182A on the right side (front side of the paper) appear. The first fixing portion 181A has a first fixing hole portion 181B and a pin engaging portion 181C, similarly to the first fixing portion 161A described above. Further, the second fixing portion 182A has a second fixing hole 182B in the same manner as the second fixing portion 162A described above.

  Next, with reference to FIGS. 10 and 11, the process of mounting the sheave unit 54S on the upper jib 18C of FIG. 11 will be described.

  As shown in FIG. 11, with the upper jib 18C lying on the ground, as shown in FIG. 10, the sheave unit 54S is lifted by the auxiliary crane AC, and the sheave unit 54S is attached to the sheave mounting portion 18P of the upper jib 18C. Can be approached from above. Soon, while the sheave unit 54S is lowered, the positioning pins 544 of the sheave unit 54S are engaged with the pair of left and right pin engaging portions 181C from above and from the rear.

  As a result, the bracket first hole portion 542 of the sheave unit 54S and the first fixing hole portion 181B of the first fixing portion 181A are matched, and the bracket second hole portion 543 and the second fixing portion 182A of the sheave unit 54S are aligned. The position with the second fixing hole 182B matches. Then, the operator inserts the prepared connection pin S1 (FIG. 6) into the bracket first hole 542 and the first fixing hole 181B, and inserts the connection pin S2 (FIG. 6) into the bracket second hole. 543 and the second fixing hole 182B. As a result, the sheave unit 54S including the idler sheave 54 is mounted and fixed to the sheave mounting portion 18P of the upper jib 18C of the jib 18.

  Note that when the sheave unit 54S is removed from the upper jib 18C, the connection pins S1 and S2 are pulled out, and a process opposite to the above mounting process is performed.

  Further, in the state where the upper jib 18C shown in FIG. 11 is erected on the ground G so as to extend along the vertical direction from the ground G, similarly to the upper boom 16T of FIG. In a similar process, the sheave unit 54S may be mounted on the sheave mounting portion 18P (specific unit holding portion).

  As described above, when the sheave unit 54S including the idler sheave 54 is mounted on the sheave mounting portion 18P of the upper jib 18C, the main winding rope 50 is suspended from the tip of the jib 18 in the crane 10A of FIG. With the illustrated hook, lifting and hanging work can be performed. In addition, the crane 10A (ruffing form) shown by FIG. 1 comprises a part of jib boom form of this invention. In this case, the entire boom 16 is mounted on the revolving structure 12 and the entire jib 18 is mounted on the boom 16.

  Furthermore, FIG. 12 is a side view of the third form (long form or main boom form, crane 10C) of the crane 10 according to the present embodiment. FIG. 12 shows a state in which the long boom 70 (main boom) of the crane 10C is laid down on the ground. The long boom 70 is supported by the front end portion of the revolving structure 12 so as to be raised and lowered. The long boom 70 includes a lower boom 16A, an intermediate boom 16B, intermediate booms 71 to 76, and an upper jib 18C. Here, the lower boom 16A and the intermediate boom 16B are a part of the above-described boom 16, and the upper jib 18C is a part of the above-described jib 18. That is, the crane 10A shown in FIG. 1 is disassembled, and the intermediate boom 71 to the intermediate boom 76 are combined with the lower boom 16A, the intermediate boom 16B, and the upper jib 18C, so that the long boom 70 that is longer than the boom 16 is obtained. Composed.

  The crane 10 </ b> C further includes a pair of left and right guy lines 81 and an idler sheave 82. The guy line 81 connects the tip of the mast 20 (rotating end) and the tip of the long boom 70 (tip of the upper jib 18C). The idler sheave 82 supports a substantially central portion of the guy line 81. When the boom hoisting rope 38 is wound up by the boom hoisting winch 30 from the state shown in FIG. 12, the long boom 70 is raised.

  Also in the crane 10C, an idler sheave 54 is provided on the back side of the tip of the upper jib 18C. That is, as described above, the sheave unit 54S is mounted on the sheave mounting portion 18P of the upper jib 18C by the mounting process as shown in FIGS. Is suspended, and lifting and suspending work of a suspended load can be performed by a hook (not shown). In addition, the crane 10C (long form) provided with the long boom 70 constitutes a part of the jib boom form of the present invention. In this case, a part of the boom 16 is attached to the revolving structure 12 and a part of the jib 18 is attached to a part of the boom 16.

  As described above, in the present embodiment, the crane 10 has a basic configuration in which the main winding rope 50 is suspended from the distal end portion of the boom 16 and a luffing configuration in which the main winding rope 50 is suspended from the distal end portion of the jib 18 (jib boom). The configuration can be changed between (configuration) and (configuration). The crane 10 includes a sheave unit 54S including an idler sheave 54, a sheave mounting portion 16P that is disposed on the boom 16 and can hold the sheave unit 54S, and a sheave mounting portion 18P that is disposed on the jib 18 and can hold the sheave unit 54S. And comprising. When the crane 10 is set to the basic configuration, the sheave unit 54S is held by the sheave mounting portion 16P, so that the main winding rope 50 can be supported by the idler sheave 54 at the distal end portion of the boom 16. On the other hand, when the crane 10 is set to the luffing configuration, the sheave unit 54S is held by the sheave mounting portion 18P, so that the main winding rope 50 can be supported by the idler sheave 54 at the tip of the jib 18. . Therefore, in order to support the main winding rope 50 in the two forms of the basic form and the luffing form, compared to the form in which individual sheaves are rotatably held at the tip part of the boom 16 and the tip part of the jib 18. The cost of the crane 10 can be reduced. Further, in the luffing configuration, since the sheave unit 54S is not mounted on the sheave mounting portion 16P, it is possible to prevent an unnecessary moment from being applied to the distal end portion of the boom 16.

  Further, according to the above embodiment, the sheave unit 54S can be easily mounted and fixed to the sheave mounting portion 16P (specific unit holding portion). Specifically, the sheave unit 54S is lifted in a state where an auxiliary lifting device such as the auxiliary crane AC is connected to the lifting bracket 54W of the sheave unit 54S. Then, the positioning pin 544 of the sheave unit 54S is engaged with the pin engaging portion 161C of the sheave mounting portion 16P, and the sheave unit 54S is rotated around the rotation axis (second rotation axis) of the positioning pin 544 parallel to the sheave rotation shaft 541. When rotated, the pair of left and right bracket first holes 542 match the pair of left and right first fixing holes 161B, and the pair of left and right bracket second holes 543 is a pair of left and right second fixing holes. It matches 162B. Therefore, the operator can easily fix the sheave unit 54S to the sheave mounting portion 16P by inserting the connecting pins S1 and S2 into the matched holes.

  In particular, in the present embodiment, when the upper boom 16T of the boom 16 is placed on the ground, the first fixing hole 161B of the sheave mounting portion 16P is spaced above the second fixing hole 162B. The pin engaging portion 161C is disposed adjacent to the first fixing hole 161B so that the positioning pin 544 can be supported from below. According to such a configuration, when the positioning pin 544 of the sheave unit 54S is engaged with the pin engaging portion 161C of the sheave mounting portion 16P, the auxiliary crane AC lowers the sheave unit 54S, so that the sheave unit 54S The sheave unit 54S can be rotated around the rotation axis of the positioning pin 544 by its own weight. Accordingly, the sheave unit 54S can be more easily fixed to the sheave mounting portion 16P.

  In the present embodiment, the positioning pin 544 is disposed between the sheave rotation shaft 541 and the bracket first hole 542 so as to extend in parallel with the sheave rotation shaft 541 and to connect the pair of left and right fixing brackets 54T to each other. The pin engaging portion 161C has a hook shape that can hold the positioning pin 544 from below. According to such a configuration, the sheave unit 54S can be easily rotated around the rotation axis of the positioning pin 544 by engaging the positioning pin 544 with the pin engaging portion 161C having a hook shape.

  Furthermore, in this embodiment, the boom 16 includes a sheave mounting portion 16P and an upper boom 16T disposed at the upper end of the boom 16, and a plurality of boom members positioned below the upper boom 16T (lower boom 16A, intermediate boom). 16B, 16C, 16D). Further, the jib 18 can be divided into an upper jib 18C that includes the sheave mounting portion 18P and is positioned at the upper end of the jib 18 and a plurality of jib members (lower jib 18A and intermediate jib 18B) positioned below the upper jib 18C. It is said. Further, the crane 10 can be further changed in form between a basic form, a luffing form, and a long form (main boom form). In the long configuration, the rear strut 21 and the front strut 22 are detached from the boom 16, and the long boom 70 including at least a part of the plurality of boom members and the upper jib 18 </ b> C is connected to the swing body 12 so as to be raised and lowered. The Then, the main winding rope 50 is suspended from the tip of the upper jib 18C located at the upper end of the long boom 70. The sheave mounting portion 18P is disposed on the upper jib 18C, and in the long configuration, the main winding rope 50 drawn from the main winding winch 34 is supported by the idler sheave 54 and the distal end portion of the upper jib 18C of the long boom 70 is supported. The sheave unit 54 </ b> S is held so as to be suspended from the bottom.

  According to such a configuration, the crane 10 can be further changed in form between the basic form, the luffing form, and the long form. When the crane 10 is set to the long configuration, the sheave unit 54S is held by the sheave mounting portion 18P, so that the main winding rope 50 can be supported by the idler sheave 54 at the tip of the long boom 70. Therefore, in order to support the main winding rope 50 in the three forms of the basic form, the luffing form, and the long form, an aspect in which individual sheaves are rotatably held at the tip part of the boom 16 and the tip part of the jib 18; In comparison, the cost of the crane 10 can be reduced.

  The crane assembling method according to the present embodiment includes an idler sheave 54 that can support the main rope 50 and a fixing bracket 54T that rotatably supports the idler sheave 54, and is arranged at the tip of the jib 18. A step of preparing a sheave unit 54S that can be selectively attached to and detached from the sheave mounting portion 18P and the sheave mounting portion 16P disposed at the tip of the boom 16, and a sheave unit 54S that is detached from the sheave mounting portion 18P. The boom 16 is mounted on the revolving body 12 after being mounted on the sheave mounting portion 16P, and the main winding rope 50 pulled out from the main winding winch 34 is guided by the idler sheave 54 of the sheave unit 54S mounted on the sheave mounting portion 16P. Then, the main winding rope 50 is suspended from the tip of the boom 16 to make the crane 10 a basic form. In the lane assembly process, at least a part of the boom 16 is mounted on the revolving body 12, and the sheave unit 54S detached from the sheave mounting part 16P is mounted on the sheave mounting part 18P, and at least a part of the jib 18 is mounted. The main winding rope 50 attached to the boom 16 and pulled out from the main winding winch 34 is guided by the idler sheave 54 of the sheave unit 54S attached to the sheave attachment portion 18P, and the main winding rope 50 is guided from the tip of the jib 18. A luffing crane assembling step (jib boom assembling step) for making the crane into a luffing form by hanging down.

  According to such a method, in order to support the main winding rope 50 in two forms of a basic form and a luffing form, the aspect which hold | maintains a separate sheave rotatably at the front-end | tip part of the boom 16 and the front-end | tip part of the jib 18 is possible. Compared with, the cost of the crane 10 can be reduced. Further, in the luffing configuration, since the sheave unit 54S is not mounted on the sheave mounting portion 16P, it is possible to prevent an unnecessary moment from being applied to the distal end portion of the boom 16.

  Furthermore, the method for assembling the crane 10 according to the present embodiment further includes a main crane assembling step for making the crane 10 a main boom, and the main crane assembling step includes arranging the boom 16 at the upper end of the boom 16. A boom dividing step of dividing the upper boom 16T into a plurality of boom members located below the upper boom 16T, an upper jib 18C including the sheave mounting portion 18P and positioned at the upper end of the jib 18, The long boom 70 is longer than the boom 16 and includes a jib splitting step for dividing the jib member into a plurality of jib members positioned below the upper jib 18C, and at least a part of the plurality of boom members and the upper jib 18C. A process of assembling the long boom 70 so that the upper jib 18C is disposed at the tip of the long boom 70, and a main winding win 34 is guided by the idler sheave 54 of the sheave unit 54S attached to the sheave attachment portion 18P, and the main rope 50 is suspended from the tip of the upper jib 18C included in the long boom 70. As described above, a step of mounting the long boom 70 on the revolving structure 12 so as to be undulating may be provided.

  According to such a method, the form of the crane 10 can be further changed between the basic form, the luffing form, and the long form. When the crane 10 is set to the long configuration, the main winding rope 50 can be supported by the idler sheave 54 at the tip of the long boom 70 by holding the sheave unit 54S on the sheave mounting portion 18P. Therefore, in order to support the suspended load rope in the three forms of the basic form, the luffing form, and the long form, as compared with the form in which individual sheaves are rotatably held at the tip part of the boom 16 and the tip part of the jib 18. Thus, the cost of the crane 10 can be reduced. In addition, in order to use the common sheave unit 54S among the respective forms, a step of replacing the sheave unit 54S from one of the sheave mounting portion 16P and the sheave mounting portion 18P in advance to the other is included.

  The crane 10 (10A, 10B, 10C) and the crane 10 assembling method (form changing method) according to the embodiment of the present invention have been described above. The present invention is not limited to these forms. The present invention can take, for example, the following modified embodiments.

  (1) In the above embodiment, when the sheave unit 54S is attached to and detached from the upper boom 16T, the upper boom 16T is placed on the ground G as shown in FIG. The sheave unit 54S may be attached to and detached from the upper boom 16T of the boom 16 in the same posture as the upper jib 18C of FIG. 11 with the boom 16 lying on the ground.

  (2) In the above embodiment, the crane 10 has been described in the form in which the form is changed to the long form 10C (main boom form), but the crane 10 is only between the basic form 10B and the luffing form 10A (jib boom form). It may be changed in form.

  (3) Moreover, in said embodiment, although the luffing form (10A) was shown as a jib boom form based on this invention, this invention is not limited to this. In the jib boom form, at least a part of the boom 16 is supported on the revolving structure 12 so as to be raised and lowered, and at least a part of the jib 18 is attached to the tip of the boom 16. As another aspect of the jib boom form, there is a fixed jib form. In the fixed jib configuration, the jib 18 is supported at the tip of the boom 16, but the jib 18 does not rise and fall during the operation of the crane 10 (fixed jib). In this case, one strut (not shown) attached to the tip of the boom 16 behind the jib 18 has a function of holding the jib 18. Further, as described above, a long form in which no strut is arranged is also included in the jib boom form of the present invention.

10 Crane 10A luffing form (jib boom form)
10B Basic form 10C Long form (main boom form, jib boom form)
12 Revolving body (crane body)
14 traveling body 16 boom 161 boom first pipe 161A first fixing portion 161B first fixing hole portion (holding portion side first hole portion)
161C Pin engaging part (engaged part)
162 Boom second pipe 162A Second fixing portion 162B Second fixing hole (holding portion side second hole)
16A Lower boom 16B, 16C, 16D Intermediate boom 16P Sheave mounting part (first unit holding part)
16T Upper boom 16W Jib support portion 16X Main winding point sheave 18 Jib 181 Jib first pipe 181A First fixing portion 181B First fixing hole 181C Pin engaging portion 182 Jib second pipe 182A Second fixing portion 182B Second Fixing hole 18A Lower jib 18B Intermediate jib 18C Upper jib 18P Sheave mounting part (second unit holding part)
18X Upper jib first main frame 18Y Upper jib second main frame 18Z Upper zebratis 20 Mast 21 Rear strut 22 Front strut 32 Jib hoisting winch 34 Main winding winch (winning load winch)
44 Jib hoisting rope 50 Main winding rope (hanging rope)
54 idler sheave
541 Sheave rotation axis (first rotation axis)
542 Bracket first hole 543 Bracket second hole 544 Positioning pin (unit positioning part)
54S Sheave unit 54T Fixing bracket (bracket, pair of sheave supports)
54W Lifting bracket (lifted part)
56 Point Sheave for Main Winding 57 Hook 70 Long Boom 71-76 Intermediate Boom 81 Guy Line 82 Idler Sheave AC Auxiliary Crane (Auxiliary Lifting Device)
G ground

Claims (7)

The crane body,
A boom that is pivotably supported by the crane body;
A jib that is pivotably supported at the tip of the boom,
A suspension rope for hoisting and lowering the suspended load;
A winch for hanging loads that winds and unwinds the rope for hanging loads;
A sheave unit including a sheave capable of supporting the suspended load rope and a bracket that rotatably supports the sheave;
In the basic form of the crane, the first unit holding unit arranged at the tip of the boom, wherein the jib is detached from the boom and the hanging load rope is suspended from the tip of the boom. A first unit holding portion capable of holding the sheave unit so that the hanging load rope pulled out from the loading winch is supported by the sheave and is suspended from the tip of the boom;
A second unit holding unit disposed at a tip of the jib, wherein at least a part of the jib including the tip is attached to at least a part of the boom, and the suspension load rope extends from the tip of the jib. Holding the sheave unit so that the hanging rope pulled out from the hanging winch is supported by the sheave and suspended from the tip of the jib in the form of the crane jib boom. A second unit holding part capable of
With
The sheave unit is a crane that is selectively attached to and detached from the first unit holding part and the second unit holding part. The bracket of the sheave unit is
A pair of sheave support portions that support the sheave so as to be rotatable about a predetermined first rotation shaft, and the pair of sheave support portions include the first rotation shaft in a radial direction in rotation of the sheave. Bracket first holes disposed at positions spaced from each other, and the sheaves at positions spaced from the first rotation shaft in the radial direction with respect to the bracket first holes. A pair of sheave support portions, each of which is opened with a bracket second hole portion disposed at a position spaced in the rotation direction of
The pair of sheave support portions may be fixed to a portion on the opposite side of the first rotation shaft from the bracket first hole portion and the second bracket hole portion, and connected to a predetermined auxiliary lifting device. Possible lifting parts,
A unit positioning unit that determines a position of the sheave unit with respect to a specific unit holding unit that is at least one of the first unit holding unit and the second unit holding unit;
Have
The specific unit holding unit is
An engaged portion engageable with the unit positioning portion;
A pair of holding portion side support portions that are respectively disposed to face the pair of sheave support portions in the axial direction by receiving the sheave unit, and the pair of holding portion side support portions include the axial direction A pair of holding portion side first hole portions arranged to match the pair of bracket first hole portions, and a pair of portions arranged to match the pair of bracket second hole portions in the axial direction. The holding part side second hole part is opened,
The unit positioning part is engaged with the engaged part of the specific unit holding part in a state where the lifted part is connected to the auxiliary lifting device and the sheave unit is lifted, and the sheave unit is connected to the unit positioning part. And the bracket first hole is aligned with the holding part side first hole and the bracket second hole is on the holding part side when rotated about the second rotation axis parallel to the first rotation axis. The distance between the unit positioning portion and the bracket first hole portion and the distance between the engaged portion and the holding portion side first hole portion are set to be the same so as to match the second hole portion. The distance between the bracket first hole part and the bracket second hole part and the distance between the holding part side first hole part and the holding part side second hole part are set to be the same. The listed crane.   In a state where the jib or the boom is placed on the ground, the holding unit side first hole of the specific unit holding unit is disposed at a position above the holding unit side second hole. The crane according to claim 2, wherein the engaged portion is disposed adjacent to the holding portion side first hole so that the unit positioning portion can be supported from below. The unit positioning portion is a positioning pin that is disposed between the first rotating shaft and the first bracket hole so as to extend in parallel with the first rotating shaft and to connect the pair of sheave support portions to each other. Yes,
The crane according to claim 3, wherein the engaged portion has a hook shape capable of holding the positioning pin from below. The boom can be divided into an upper boom including the first unit holding portion and disposed at an upper end portion of the boom and a plurality of boom members positioned below the upper boom,
The jib can be divided into an upper jib that includes the second unit holding part and is positioned at the upper end of the jib and a plurality of jib members that are positioned below the upper jib,
The second unit holding portion is disposed in the upper jib, and a main boom configured to include at least a part of the plurality of boom members and the upper jib is connected to the crane body so as to be raised and lowered, In the main boom form of the crane in which the hanging rope is suspended from the tip of the upper jib positioned at the upper end of the main boom, the hanging rope pulled out from the hanging winch is the sheave. The crane according to any one of claims 1 to 4, wherein the crane is supported by the crane and holds the sheave unit so as to be suspended from the tip of the upper jib of the main boom. The crane body,
A boom pivotally supported on the crane body;
A jib pivotally supported on the tip of the boom,
A lifting rope for lifting and hanging suspended loads; and
A winch for hanging loads that winds and unwinds the rope for hanging loads;
A method for assembling a crane, comprising:
A first unit holding portion disposed at the tip of the jib and a second unit disposed at the tip of the boom, including a sheave capable of supporting the suspended load rope and a bracket for rotatably supporting the sheave. Preparing a sheave unit that can be selectively attached to and detached from the holding unit;
The boom unit is mounted on the crane body after the sheave unit is mounted on the first unit holding portion, and the hanging load rope pulled out from the hanging load winch is mounted on the first unit holding portion. A basic crane assembling step for making the crane into a basic form by guiding by the sheave of the sheave unit and hanging the hanging load rope from the tip of the boom;
At least a part of the boom is mounted on the crane body, the sheave unit is mounted on the second unit holding portion, and at least a part of the jib is mounted on the at least part of the boom, The crane for the suspended load is guided by the sheave of the sheave unit attached to the second unit holding portion, and the suspended rope is suspended from the tip of the jib. A jib boom crane assembly process to form a jib boom,
A method for assembling a crane. A main crane assembling step for making the crane into a main boom form,
The main crane assembly process includes:
A boom dividing step of dividing the boom into an upper boom disposed at an upper end portion of the boom and a plurality of boom members positioned below the upper boom;
A jib splitting step for splitting the jib into an upper jib including the second unit holding part and positioned at the upper end of the jib and a plurality of jib members positioned below the upper jib;
The main boom is connected to at least a part of the plurality of boom members and the upper jib, and the main boom is longer than the boom, and the upper jib is disposed at the tip of the main boom. The process of assembling
The suspension load rope pulled out from the suspension load winch is guided by the sheave of the sheave unit attached to the second unit holding portion, and the suspension rope is suspended from the tip of the upper jib included in the main boom. Attaching the main boom to the crane body so that the load rope is suspended;
The method for assembling a crane according to claim 6.