JP4777821B2 - Tower crane - Google Patents

Description

  The present invention relates to a tower crane that is suitably used for carrying a load between the ground and a high place, for example, at a construction site.

  Generally, in a construction site of a high-rise building or the like, a tower crane is preferably used for transporting loads such as materials between the ground and a high place. And this tower crane is comprised by the lower traveling body which can be self-propelled, the upper revolving body mounted so that turning is possible on this lower traveling body, and the working apparatus (front attachment) provided in this upper revolving body. Has been.

  Here, the tower crane working device includes a tower boom that can be raised and lowered on the upper swing body, a tower jib that can be raised and lowered on the tip side of the tower boom, and a tower boom that can be turned to the tip side of the tower boom. A front post that is attached and connected to the tower jib via a pendant rope, and a rear post that is rotatably mounted on the tip side of the tower boom and is provided with a jib hoisting rope wound up and down between the front post and the tower post. A back stop cylinder provided between the rear post and the tower boom is provided (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-60165

  In this conventional tower crane, the front post is moved closer to and away from the rear post by winding and unwinding the jib hoisting rope with the jib hoisting winch while the tower boom is raised from the ground. Thereby, the tower jib connected to the front post via the pendant rope undulates at the tip end side of the tower boom, and by lifting and lowering the hanging hook with the tip end side of this tower jib raised to a desired height position, A load suspended by a hanging hook can be transported between the ground and a high place. In this suspension work, the backstop cylinder provided between the rear post and the tower boom is configured to support the rear post from below.

  By the way, the above-described tower crane is usually transported individually to a work site by a trailer in a state in which the tower boom, the tower jib and the like are disassembled, and these tower booms and the like are assembled at the work site.

  Then, when assembling the tower crane, with the tower boom extended so that it is almost horizontal to the ground, after attaching a tower jib, front post, rear post, etc. to the tip of the tower boom, A backstop cylinder is mounted between the side and the rear post.

  In this case, the backstop cylinder is normally attached such that one end side in the length direction is rotatable on the rear post using a pin or the like, and in the state where the rear post is attached to the tip end side of the tower boom, The end side is a free end.

  Therefore, when the back stop cylinder is extended and the other end side is attached to the tower boom, the cylinder mounting bracket provided on the tower boom and the other end side of the back stop cylinder are aligned so that the operator It is necessary to hold the cylinder.

  As described above, the operator holds the heavy weight backstop cylinder while aligning the cylinder mounting bracket provided on the tower boom and the other end of the backstop cylinder. There is a problem in that the burden on the operator during the installation work increases, and the workability thereof decreases.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a tower crane capable of improving workability when a backstop cylinder is mounted between a tower boom and a rear post. Yes.

  In order to solve the above-described problems, the present invention provides a tower boom that can be raised and lowered with respect to the ground, a tower jib that can be raised and lowered on the tip side of the tower boom, and a pivot that can be turned to the tip side of the tower boom. A front post that is attached to the tower jib via a pendant rope and a jib hoisting rope that is pivotally attached to the front end of the tower boom and raises the tower jib is wound around the front post. The present invention is applied to a tower crane provided with a rear post provided and a backstop cylinder attached between the rear post and the tower boom and supporting the rear post from below.

A feature of the configuration adopted by the invention of claim 1 is that the rear post or the tower boom is a cylinder that holds the back stop cylinder when the back stop cylinder is mounted between the rear post and the tower boom. A holding device is provided , the cylinder holding device having a first link attached to the rear post or the tower boom side on the base end side, a second link attached to the backstop cylinder side on the base end side, A connector for displacably connecting a distal end side of the first link and a distal end side of the second link between a folding position and an expanded position; and one of the first and second links. It is constituted by a stopper which is provided on the link and which is in contact with the other link and held in the expanded position .

According to a second aspect of the present invention, the first and second links are provided with a long slot in which the connector is slidably engaged along the longitudinal direction of each of the links.

  According to the first aspect of the present invention, when the backstop cylinder is attached between the tower boom and the rear post, the backstop cylinder can be held by the cylinder holding device provided on the rear post or the tower boom. Thereby, since it is not necessary for an operator to support the backstop cylinder which is a heavy article, the burden of the operator when attaching a backstop cylinder can be reduced and the workability | operativity can be improved.

In this case, for example, when the backstop cylinder is transported together with the rear post or the like, the backstop cylinder can be compactly stored in the rear post or the like by displacing the first and second links to the folding position. Further, when the backstop cylinder is mounted between the tower boom and the rear post, the backstop cylinder can be stably held by displacing the first and second links to the expanded position and holding them by the stopper. The workability when mounting the backstop cylinder can be improved.

According to the second aspect of the present invention, the first and second links are provided with long slots extending in the longitudinal direction, and the connecting tool is slidably engaged with the long slots. Even if the suspended load operation is performed with the device attached, the expansion and contraction operation of the backstop cylinder during the suspended load operation is not hindered by the cylinder holding device. For this reason, it is not necessary to remove the cylinder holding device even after the operation of attaching the backstop cylinder is completed, and thus the operation of attaching the backstop cylinder can be performed quickly.

  Hereinafter, an embodiment of a tower crane according to the present invention will be described in detail with reference to FIGS. 1 to 11 by taking a self-propelled tower crane as an example.

  In the figure, reference numeral 1 denotes a self-propelled tower crane. The tower crane 1 includes a self-propelled crawler-type lower traveling body 2, and an upper revolving body 3 that is turnably mounted on the lower traveling body 2. The working device 9 described later provided on the front side of the upper swing body 3 is used to perform a hanging work for carrying a load between the ground and a high place using the working device 9. .

  Here, the upper swing body 3 is provided with a boom hoisting winch 4 for winding and unwinding a boom hoisting rope 21 described later, and a hoisting winch 5 for winding and unwinding a hoisting rope 23 described later. It has been.

  Reference numeral 6 denotes a mast whose base end side is rotatably attached to the upper swing body 3. One end side of a pendant rope 7 having a certain length is connected to the distal end side of the mast 6. The other end side is connected to the front end side of the tower boom 10 described later. Further, a sheave 8 is rotatably provided at the tip end side of the mast 6, and a boom hoisting rope 21 described later is wound around the sheave 8.

  Reference numeral 9 denotes a working device provided on the front side of the upper swing body 3, and the working device 9 includes a tower boom 10, a tower jib 13, a front post 15, a rear post 18, a backstop cylinder 25 and the like which will be described later. .

  Reference numeral 10 denotes a tower boom whose base end side is rotatably attached to the upper swing body 3. The tower boom 10 includes a plurality of (only two shown) struts 10A extending in the length direction and a space between the struts 10A. A strong frame structure is formed by a large number of beam members 10B, 10B,. Then, the tower boom 10 winds and unwinds the boom hoisting rope 21 by the boom hoisting winch 4 so that the tower boom 10 stands substantially perpendicular to the ground as shown in FIG. 1 and the ground as shown in FIG. Therefore, it undulates from a position extending almost horizontally.

  Here, a jib hoisting winch 11 is provided on the base end side of the tower boom 10 as shown in FIG. 1, and the jib hoisting winch 11 winds and unwinds a jib hoisting rope 22 described later. . Further, a top sheave 12 is rotatably provided at the front end side of the tower boom 10, and the top sheave 12 is constituted by a plurality of sheaves that rotate independently from each other as shown in FIG. The jib hoisting rope 22, the hoisting rope 23, and the like are wound. Further, left and right cylinder brackets 10C and 10C to which a backstop cylinder 25 described later is attached are fixed to the beam member 10B of the tower boom 10 located in the vicinity of the top sheave 12, and each cylinder bracket 10C includes: A pin hole 10D through which a pin 27 described later is inserted is formed.

  Reference numeral 13 denotes a tower jib attached to the tip end side of the tower boom 10 so as to be raised and lowered. The tower jib 13 includes a plurality of pillars 13A (only two are shown) extending in the length direction and a plurality of pillars 13A connecting the pillars 13A. A solid frame structure is formed by the beam members 13B, 13B,. The tower jib 13 is raised and lowered on the tip end side of the tower boom 10 by winding and unwinding the jib hoisting rope 22 with the jib hoisting winch 11. Further, a sheave 14 around which the hoisting rope 23 is wound is rotatably provided on the tip side of the tower jib 13.

  15 is a front post whose base end side is rotatably attached to the front end side of the tower boom 10, and one end side of a pendant rope 16 having a certain length is connected to the front end side of the front post 15, The other end side of the pendant rope 16 is connected to the front end side of the tower jib 13. A front sheave 17 is rotatably provided at the front end side of the front post 15.

  Reference numeral 18 denotes a rear post disposed rearward of the front post 15 and having a proximal end pivotably attached to the distal end side of the tower boom 10. A pendant rope having a certain length dimension is disposed on the distal end side of the rear post 18. One end side of 19 is connected, and the other end side of the pendant rope 19 is connected to the base end side of the tower boom 10. A rear sheave 20 is rotatably provided at the front end side of the rear post 18, and a jib hoisting rope 22 is wound between the rear sheave 20 and the front sheave 17 provided on the front post 15. It becomes the composition which is done.

  Here, as shown in FIGS. 3 and 5, the rear post 18 includes left and right struts 18 </ b> A and 18 </ b> A that extend in the longitudinal direction while facing the left and right directions, and these left and right struts 18 </ b> A. , 18A are provided with an upper connecting body 18B and a lower connecting body 18C having a rectangular tube shape. Further, left and right cylinder brackets 18D and 18D to which a backstop cylinder 25 described later is attached are fixed to the upper connecting body 18B, and a pin 26 described later is attached to each cylinder bracket 18D as shown in FIG. A pin hole 18E through which is inserted is formed. Further, left and right link brackets 18F and 18F to which a first link 30 described later is attached and are located below each cylinder bracket 18D are fixed to the lower connecting body 18C.

  A boom hoisting rope 21 is wound around the sheave 8 of the mast 6. The boom hoisting rope 21 is wound and unwound by the boom hoisting winch 4. The boom hoisting winch 4 winds and unwinds the boom hoisting rope 21 so that the front end side of the mast 6 rotates forward and rearward and is connected to the front end side of the mast 6 via the pendant rope 7. The tower boom 10 is configured to undulate with respect to the ground.

  Reference numeral 22 denotes a jib hoisting rope wound between the front sheave 17 of the front post 15 and the rear sheave 20 of the rear post 18. The jib hoisting rope 22 is a top sheave provided on the tip side of the tower boom 10. 12 is led to the jib hoisting winch 11. Then, the jib hoisting rope 22 is wound and unwound by the jib hoisting winch 11 so that the front end of the front post 15 is rotated so as to approach and separate from the rear post 18, and a pendant rope is attached to the front end of the front post 15. The tower jib 13 connected via 16 is configured to undulate on the tip end side of the tower boom 10.

  Reference numeral 23 denotes a hoisting rope having one end wound around the hoisting winch 5, and the other end of the hoisting rope 23 is provided at the top sheave 12 provided at the front end side of the tower boom 10 and the front end side of the tower jib 13. The top end of the tower jib 13 is hooked through the sheave 14 and the like. A hanging load hook 24 is attached to a midway portion of the hoisting rope 23 extending downward from the sheave 14 of the tower jib 13. Therefore, when the hoisting rope 23 is wound and unwound by the hoisting winch 5, the hanging load hook 24 is raised and lowered.

  Reference numerals 25 and 25 denote left and right backstop cylinders mounted between the rear post 18 and the tower boom 10. The backstop cylinders 25 support the rear post 18 from below, so that the rear post 18 is connected to the tower boom. The rotation to the 10 side is suppressed.

  Here, each backstop cylinder 25 is constituted by a hydraulic cylinder having a tube 25A and a rod 25B that expands and contracts with respect to the tube 25A, and a mounting eye 25C is provided at the protruding end of the rod 25B. The bottom side of the tube 25 </ b> A, which is the base end side of the backstop cylinder 25, is rotatably attached to a cylinder bracket 18 </ b> D provided on the rear post 18 using a pin 26. On the other hand, the mounting eye 25C of the rod 25B on the front end side of the backstop cylinder 25 is rotatably attached to the cylinder bracket 10C on the front end side of the tower boom 10 using a pin 27 as shown in FIG. It has become.

  28 and 28 are left and right cylinder receiving members provided on the lower coupling body 18C of the rear post 18, and each cylinder receiving member 28 is formed by a plate body bent in a substantially U shape as shown in FIG. The cylinder brackets 18D that are formed and fixed to the upper coupling body 18B are disposed below the cylinder brackets 18D. As shown in FIGS. 3 and 4, each cylinder receiving member 28 removes the tube 25 </ b> A of the backstop cylinder 25 with the rod 25 </ b> B of each backstop cylinder 25 removed from the cylinder bracket 10 </ b> C of the tower boom 10. To grip.

  As a result, the backstop cylinder 25 can be stored on the rear post 18 side in a state extending along the rear post 18, and the backstop cylinder is rotatably attached to the cylinder bracket 18D using the pin 26. 25 is configured to prevent inadvertent rotation about the pin 26 during transportation or the like.

  As described above, each backstop cylinder 25 is held by the cylinder receiving member 28 as shown in FIG. 3 and FIG. 4 and extended along the rear post 18, and as shown in FIG. Is held by the cylinder holding device 29, and the axis L- connecting the attachment portion with the rear post 18 (pin hole 18E of the cylinder bracket 18D) and the attachment portion with the tower boom 10 (pin hole 10D of the cylinder bracket 10C). It is displaced between the mounting postures arranged on L.

  Reference numerals 29 and 29 denote left and right cylinder holding devices provided between the rear post 18 and each backstop cylinder 25. Each of the cylinder holding devices 29 includes a tower boom 10 as shown in FIGS. The backstop cylinder 25 is held when the backstop cylinder 25 is attached between the front end side of the rear post 18 and the rear post 18. Each cylinder holding device 29 includes a first link 30, a clamp member 32, a second link 33, a coupling tool 35, a stopper 36, and the like which will be described later.

  Reference numeral 30 denotes a first link whose base end side is rotatably attached to the rear post 18, and the first link 30 is formed as one elongated plate. And the base end side of the 1st link 30 is attached to the link bracket 18F provided in the lower connection body 18C of the rear post 18 so that rotation is possible using the pin 31, and the front end side is a free end. Further, a long slot 30A extending from the front end side to the intermediate portion along the longitudinal direction of the first link 30 is provided on the front end side (free end side) of the first link 30, and in the long slot 30A Is configured such that a bolt 35A of a connector 35 described later is slidably engaged.

  A clamp member 32 is detachably attached to the tube 25A of the backstop cylinder 25. The clamp member 32 sandwiches the tube 25A by a pair of curved plates 32A and 32A that are curved in a semicircular arc shape. It is attached at a desired position in the longitudinal direction. A link mounting plate 32B for mounting a second link 33 described later is provided on the outer peripheral surface of one curved plate 32A so as to project outward.

  Reference numeral 33 denotes a second link whose base end side is rotatably attached to the backstop cylinder 25 via the clamp member 32. The second link 33 is formed by two elongated plates facing each other at a predetermined interval. 33A, 33A (see FIG. 8). And the base end side of the 2nd link 33 is rotatably attached using the pin 34 to the link attachment board 32B of the clamp member 32 fixed to the tube 25A of the backstop cylinder 25, and the front end side is a free end. It has become. Further, on the distal end side (free end side) of each plate 33A constituting the second link 33, a long slot 33B extending from the distal end side to the intermediate portion along the longitudinal direction of the second link 33 is provided. In addition, a bolt 35A of a connector 35 (to be described later) is slidably engaged in each long slot 33B.

  Reference numeral 35 denotes a connection tool provided between the front end side of the first link 30 and the front end side of the second link 33. The connection tool 35 connects the first and second links 30 and 33 to each other in FIG. 4, and can be displaced between the folding position when the backstop cylinder 25 is in the retracted position as shown in FIG. 4 and the expanded position when the backstop cylinder 25 is in the mounted position as shown in FIGS. 5 and 6. To be linked. Here, for example, as shown in FIG. 8, the connecting tool 35 includes a bolt 35 </ b> A inserted into the long slot 30 </ b> A of the first link 30 and each long slot 33 </ b> B of the second link 33, and the second link 33. Is comprised of two washers 35B and 35B inserted into the bolt 35A with the nut from the left and right directions, and a nut 35C screwed onto the bolt 35A.

  And in the state which inserted the 1st link 30 between each plate 33A which comprises the 2nd link 33, each long slot hole 33B of the 2nd link 33, 30A long slot hole of the 1st link 30, each washer By inserting a bolt 35A through 35B and screwing a nut 35C into this bolt 35A, the distal end side of the first link 30 and the distal end side of the second link 33 can be displaced (bent) by the connecting device 35. It is the structure connected to.

  In this case, since the coupler 35 is slidably engaged with the long slot 30A of the first link 30 and the long slot 33B of the second link 33, the first link 30 and the second link 33 are engaged. For example, as shown in FIGS. 3 and 4, the folding position when the backstop cylinder 25 is stored on the rear post 18 side, and as shown in FIGS. 5 and 6, the backstop cylinder 25 is connected to the rear post 18 and the tower boom 10. In addition to the expansion position when mounted between the back stop cylinder 25 and the rear stop 18, the position of the back stop cylinder 25 is extended substantially linearly following the reduction operation of the back stop cylinder 25 as shown in FIG. It is the structure which can do.

  Reference numeral 36 denotes a stopper provided on the distal end side of the second link 33. The stopper 36 has a rectangular flat plate shape as shown in FIG. 8 and the like, and the distal end portion of each plate 33A constituting the second link 33. They are integrally formed between them, or are fixed using means such as welding.

  As shown in FIGS. 5 to 7, the stopper 36 comes into contact with the first link 30 when the backstop cylinder 25 is attached between the rear post 18 and the tower boom 10, so that the first link 30 and the second link 33 are held in the expanded position, and the backstop cylinder 25 is attached to the rear post 18 (the pin hole 18E of the cylinder bracket 18D) and the tower boom 10 (the cylinder bracket 10C). It is positioned on the axis LL connecting the pin hole 10D).

  That is, in the state where the back stop cylinder 25 is rotationally displaced about the pin 26 and the back stop cylinder 25 is disposed on the axis LL connecting the attachment portion with the rear post 18 and the attachment portion with the tower boom 10. 6 and 7, the angle θ on the pin 26 side formed by the first link 30 and the second link 33 is less than 180 ° (θ <180 °), and the first link 30 and the first link 30 The second link 33 is displaced to an expanded position that is bent (crossed) in a reverse-helix shape.

  At this time, since the backstop cylinder 25 tends to rotate toward the rear post 18 around the pin 26 by its own weight, both of the backlink cylinder 25 and the second link 33 are centered on the connector 35. A force F is applied to bend so that the angle θ between them becomes small. On the other hand, the stopper 36 fixed to the second link 33 abuts on the first link 30, so that the first link 30 and the second link 33 are not further bent, 6 and 7 is held in the expanded position bent in a reverse hemispherical shape.

  The back stop cylinder 25 is attached to the rear post 18 (the pin hole 18E of the cylinder bracket 18D) and the tower boom 10 by holding the first and second links 30 and 33 in the expanded position by the stopper 36. And an attachment portion (a pin hole 10D of the cylinder bracket 10C) is stably held on the axis LL.

  On the other hand, in the state where the first link 30 and the second link 33 are bent in a reverse character shape as shown in FIGS. 6 and 7, the operator or the like lifts the connecting device 35 to the pin 26 side. The stopper 36 can be detached from the first link 30. As a result, the backstop cylinder 25 is rotated toward the rear post 18 around the pin 26 by its own weight, and the first link 30 and the second link 33 are in the folding positions shown in FIGS. By being displaced, the backstop cylinder 25 can be gripped by the cylinder receiving member 28 and stored on the rear post 18 side.

  The tower crane 1 according to the present embodiment has the above-described configuration. Hereinafter, an operation for attaching the backstop cylinder 25 between the tower boom 10 and the rear post 18 constituting the tower crane 1 will be described.

  First, as shown in FIG. 2, with the tower boom 10 lying down so as to be substantially horizontal with respect to the ground, the base end side of the tower jib 13, the base end side of the front post 15, The base end side of the rear post 18 is attached so as to be rotatable. For example, the rear post 18 is held so as to be substantially perpendicular to the ground using another crane or the like (not shown).

  At this time, as shown in FIGS. 3 and 4, the base end side of the backstop cylinder 25 (tube 25A) is rotatably attached to the cylinder bracket 18D of the rear post 18 using a pin 26, and is intermediate between the tubes 25A. The part is gripped by the cylinder receiving member 28. The first link 30 and the second link 33 constituting the cylinder holding device 29 are in the folding position and connect the rear post 18 and the backstop cylinder 25.

  In this state, the operator removes the tube 25 </ b> A of the backstop cylinder 25 from the cylinder receiving member 28 and rotates the front end side of the backstop cylinder 25 away from the rear post 18 around the pin 26. As a result, the first link 30 and the second link 33 constituting the cylinder holding device 29 follow the rotation of the backstop cylinder 25, and from the folding position shown in FIGS. 3 and 4 to FIG. Displacement to the expanded position shown at 6 etc.

  When the backstop cylinder 25 reaches the axis LL connecting the attachment portion with the rear post 18 and the attachment portion with the tower boom 10, the first link 30 and the second link 33 are reversed. The stopper 36 that is bent in a letter shape and fixed to the second link 33 contacts the first link 30 (see FIGS. 6 and 7).

  At this time, as shown in FIG. 7, due to the weight of the backstop cylinder 25, the first link 30 and the second link 33 are bent so that the angle .theta. A force F to be applied acts. However, since the stopper 36 fixed to the second link 33 abuts on the first link 30, the first link 30 and the second link 33 are not further bent, and the first link 30 is not bent further. , The second links 30 and 33 are held in the expanded position bent in a reverse hemispherical shape.

  As a result, the backstop cylinder 25 is stably held on the axis LL connecting the attachment portion with the rear post 18 and the attachment portion with the tower boom 10 by the cylinder holding device 29 without being supported by the operator. Can do. Therefore, just by extending the rod 25B of the backstop cylinder 25 in this state, the mounting eye 25C of the rod 25B and the pin hole 10D of the cylinder bracket 10C provided in the tower boom 10 are aligned as shown in FIG. And both can be easily connected using the pin 27.

  Thus, according to the present embodiment, the cylinder holding device 29 including the first link 30, the second link 33, the coupling tool 35, the stopper 36, and the like is provided between the rear post 18 and the backstop cylinder 25. Thus, the axis LL connecting the back stop cylinder 25 with the rear post 18 (the center of the pin hole 18E of the cylinder bracket 18D) and the attachment portion of the tower boom 10 (the center of the pin hole 10D of the cylinder bracket 10C). Can be held on.

  As a result, the rod 25B is extended from the tube 25A of the backstop cylinder 25, and the worker is heavy while attaching the mounting eye 25C provided on the rod 25B to the cylinder bracket 10C of the tower boom 10 using the pin 27. There is no need to support the backstop cylinder 25. For this reason, the burden on the operator when attaching the backstop cylinder 25 between the rear post 18 and the tip end side of the tower boom 10 can be reduced, and workability when attaching the backstop cylinder 25 can be improved. it can.

  On the other hand, after the back stop cylinder 25 is attached between the rear post 18 and the tip end side of the tower boom 10 as shown in FIG. 9, the rear post 18 is moved to the tower boom 10 side as shown by a two-dot chain line in FIG. By tilting, the front end side of the rear post 18 and the base end side of the tower boom 10 are connected by a pendant rope 19.

  In this case, first, as shown in FIG. 10, the rear post 18 is tilted toward the tower boom 10 by reducing the rod 25 </ b> B of the backstop cylinder 25. At this time, the backstop cylinder 25 and the rear post 18 are connected by the first link 30, the second link 33, and the connecting tool 35, and the connecting tool 35 is a long slot provided in the first link 30. 30A and a long slot 33B provided in the second link 33 are slidably engaged.

  For this reason, as shown in FIG. 10, the first link 30 and the second link 33 follow the contraction operation of the backstop cylinder 25 and are substantially linear between the backstop cylinder 25 and the rear post 18. Can be extended. Accordingly, the tilting operation of the rear post 18 with respect to the tower boom 10 is not hindered by the cylinder holding device 29, and the cylinder holding device 29 is provided between the back stop cylinder 25 and the two-dot chain line in FIG. The rear post 18 can be tilted toward the tower boom 10 side.

  As a result, the pendant rope 19 can be easily connected between the distal end side of the rear post 18 and the proximal end side of the tower boom 10 with the pendant rope 19 being loosened. The workability can be improved.

  Then, after the pendant rope 19 is attached to the distal end side of the rear post 18 and the proximal end side of the tower boom 10, the rod 25B of the backstop cylinder 25 is again extended as shown in FIG. As shown, the rear post 18 is erected so as to be substantially perpendicular to the ground. Thereby, the front end side of the rear post 18 and the base end side of the tower boom 10 can be easily connected by the pendant rope 19 having an appropriate tension.

  Thus, according to the present embodiment, the first link 30 is provided with the long slot 30A and the second link 33 is provided with the long slot 33B, and the connector 35 is slidable in each of the long slots 30A and 33B. It is set as the structure engaged. Thereby, even if the cylinder holding device 29 is provided between the rear post 18 and the backstop cylinder 25, the backstop cylinder 25 can be expanded and contracted between the extended state shown in FIG. 9 and the reduced state shown in FIG. it can.

  Therefore, the expansion / contraction operation of the backstop cylinder 25 during the suspension work of the tower crane 1 is not hindered by the cylinder holding device 29, and the cylinder holding device 29 is removed even after the installation work of the backstop cylinder 25 is completed. There is no need, and accordingly, the work of attaching the backstop cylinder 25 can be performed quickly.

  In the above-described embodiment, the case where the cylinder holding device 29 is provided between the rear post 18 and the backstop cylinder 25 is illustrated. However, the present invention is not limited to this, and the cylinder holding device 29 may be provided between the tip end side of the tower boom 10 and the backstop cylinder 25 as in a modification shown in FIG.

  Moreover, in embodiment mentioned above, the self-propelled tower crane 1 provided with the lower traveling body 2 is mentioned as an example, and is demonstrated. However, the present invention is not limited to this, and can be applied to a stationary tower crane that does not have a traveling body called a glow-up crane or the like.

It is a front view which shows the tower crane by embodiment of this invention. It is a front view which shows the state which extended the tower boom horizontally with respect to the ground in order to perform the attachment operation | work of a backstop cylinder. It is a perspective view which shows the backstop cylinder, cylinder holding device, etc. in FIG. 2 in the state in which the 1st, 2nd link was a folding position. FIG. 3 is an enlarged front view of a partially broken portion showing a part in FIG. 2. FIG. 4 is a perspective view similar to FIG. 3 showing the backstop cylinder, the cylinder holding device, and the like with the first and second links in the expanded position. It is an enlarged front view similar to FIG. 4 which shows the state which hold | maintained the backstop cylinder with the cylinder holding | maintenance apparatus. It is a principal part enlarged view which expands and shows the 1st link in FIG. 6, a 2nd link, a stopper, etc. FIG. It is a disassembled perspective view which shows a cylinder holding device. It is an enlarged front view which shows the state which attached the rod of the backstop cylinder to the tower boom. It is an enlarged front view which shows the state which reduced the rod of the backstop cylinder and inclined the rear post. It is an enlarged front view similar to FIG. 9 which shows the modification which provided the cylinder holding device in the tower boom side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tower boom 13 Tower jib 15 Front post 16 Pendant rope 18 Rear post 22 Jib hoisting rope 25 Backstop cylinder 29 Cylinder holding device 30 1st link 30A, 33B Long groove hole 33 2nd link 35 Connecting tool 36 Stopper

Claims (2)

A tower boom that can be raised and lowered with respect to the ground, a tower jib that is attached to the tip side of the tower boom so that it can be raised and lowered, and a tower jib that is rotatably attached to the tip side of the tower boom via a pendant rope A front post to be connected; a rear post rotatably attached to a front end side of the tower boom; and a jib hoisting rope for raising and lowering the tower jib between the front post; and the rear post and the tower boom In a tower crane comprising a backstop cylinder attached between and supporting the rear post from below,
The rear post or the tower boom is provided with a cylinder holding device that holds the back stop cylinder when the back stop cylinder is mounted between the rear post and the tower boom .
The cylinder holding device includes a first link having a base end side attached to the rear post or the tower boom side, a second link having a base end side attached to the backstop cylinder side, and the first link. A connector that connects the distal end side and the distal end side of the second link so as to be displaceable between a folding position and an expanded position; and the other provided on one of the first and second links A tower crane comprising a stopper that abuts against the link and holds the link in the expanded position . The first, the second link, the tower crane according to claim 1, wherein the connector along the longitudinal direction of each link is be provided with a long groove hole that engages slidably.

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