JP2016222400A - Tower crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress swing in tower strut upon deconstruction and the like.SOLUTION: A tower crane comprises a traveler 2, a rotator 3 rotatably arranged on the traveler 2, a tower boom 20 attached to rotator 3 in a manner capable of standing/falling, a tower jib 40 attached to an upper edge part of the tower boom 20 in a manner capable of standing/falling, a tower jib standing/falling assistant member 80 rotatably arranged on an upper edge of the tower boom 20 for standing/falling of the tower jib 40, and a tower jib assistant member jointing mechanism 180 jointing the tower jib assistant member 80 on the tower boom 20 in a detachable manner.SELECTED DRAWING: Figure 33

Description

  The present invention relates to a tower crane.

The tower crane includes a tower boom, a tower jib attached to the upper end of the tower boom so as to be raised and lowered, and a swing lever for raising and lowering the tower jib, that is, a member corresponding to the tower strut of the present invention.
The swing lever has a substantially triangular shape, and one end is pivotally supported by the tower boom so as to be rotatable. One apex angle of the swing lever is connected to the tip of the tower jib via the second pendant rope. The other apex angle of the swing lever is connected to the jib hoisting rope via a third pendant rope, bridle. When the jib hoisting drum is driven to wind or unwind the jib hoisting rope, the swing lever rotates via the third pendant rope. By turning the swing lever, the tower jib stands through the second pendant rope. By adjusting the winding amount or unwinding amount of the tower jib hoisting rope, the standing angle of the swing lever can be arbitrarily determined (for example, see Patent Document 1).

JP 2003-95584 A

  In the tower crane described in Patent Document 1, the swing lever is supported by the tension acting on the second pendant rope and the tension acting on the third pendant rope. Therefore, when one of the second and third pendant ropes is removed from the swing lever, such as when the tower crane is disassembled, the swing lever becomes swingable in the turning direction.

  A tower crane according to the present invention includes a traveling body, a revolving body provided on the traveling body so as to be able to turn, a tower boom attached to the revolving body so as to be raised and lowered, and a tower jib attached to the upper end portion of the tower boom so as to be raised and lowered. And a tower jib raising / lowering auxiliary member for raising and lowering the tower jib provided at the upper end of the tower boom, and a tower jib auxiliary member connecting mechanism for releasably connecting the tower jib auxiliary member to the tower boom.

  According to the present invention, the swing of the tower jib auxiliary member can be suppressed.

The side view which shows one Embodiment of the tower crane of this invention, and shows the embedding state of a tower jib. The side view in the working posture of the tower crane shown in FIG. It is a figure for demonstrating the disassembly method of the tower crane shown to FIG. 1, FIG. 2, and the side view of the state which embraced the tower jib. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view for demonstrating the next process of FIG. The side view which shows the structure which fixes a tower jib bridle to a tower jib bail. (A) is a side view showing a state where the lower tower hoisting support pendant rope is connected to the lower tower boom, (b) is a sectional view taken along line XXIb-XXIb of (a), and (c) is XXIc of (a). -XXIc line expanded sectional view. (A) is a side view which shows the connection mechanism of an upper and lower tower jib, (b) is the side view seen from the front of (a). (A) is a side view of a tower back stop, (b) is an XXIIIb-XXIIIb line enlarged sectional view of (a). The side view which shows 1st Embodiment of the folding mechanism of an upper and lower tower boom. (A)-(d) is a side view which shows operation | movement of the folding mechanism shown in FIG. The side view which shows 2nd Embodiment of a folding mechanism. (A)-(d) is a side view which shows operation | movement of the folding mechanism shown in FIG. (A) is the side view which shows 3rd Embodiment of a folding mechanism, (b) is the side view seen from the front of (a). (A)-(d) is a side view which shows operation | movement of the folding mechanism shown to Fig.28 (a). (A) is the side view which shows Embodiment 4 of a folding mechanism, (b) is the side view seen from the front of (a). (A)-(d) is a side view which shows operation | movement of the folding mechanism shown to Fig.30 (a). FIG. 2 is an enlarged view of a region XXXII around the tower strut 80 in FIG. 1. The figure of the state which locked the tower strut by the locking mechanism of FIG. XXXIV-XXXIV sectional view taken on the line of FIG. FIG. 34 is an enlarged view of the lock mechanism in the released state illustrated in FIG. 33. FIG. 35 is an enlarged view showing a locked state of the lock mechanism shown in FIG. 34. XXXVII line sectional drawing of FIG. The side view seen from the x direction of FIG. The side view which shows the state which hold | maintained the lower tower jib in FIG. The figure for demonstrating the length which can reduce the space required at the time of decomposition | disassembly of the tower crane by this invention.

[Structure of tower crane]
(Lower traveling body)
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a tower crane 1 embedding state according to an embodiment of the tower crane 1 of the present invention, and FIG. 2 is a side view of the tower crane shown in FIG.
The tower crane 1 has a lower traveling body 2 and an upper revolving body 3 having a main frame 3a that is mounted on the lower traveling body 2 so as to be able to swivel. The lower traveling body 2 has a pair of crawler belts 2a arranged in the left-right direction. Although not shown, the crawler belt 2a is wound around the outer periphery of a driving roller, a driven roller, and a plurality of upper and lower rollers. The lower traveling body 2 travels in the front-rear direction by driving the drive roller by a drive motor (not shown).

(Upper turning body)
A cab 4 is provided in front of the upper swing body 3. A counterweight 5 is provided behind the upper swing body. A vehicle body cover 6 that covers an engine, a fuel tank, and the like (not shown) is provided between the cab 4 and the counterweight 5. A tower boom 20 is provided on the left side of the cab 4 of the main frame 3a so as to be raised and lowered on the main frame 3a. In the following description, the direction in which the cab 4 is viewed from the counterweight 5 is the front, and the direction in which the cab 4 is viewed from the counterweight 5 is the rear. Further, the right hand side is set to the right side and the left hand side is set to the left side when the front is viewed from the cab 4.

  The main frame 3a is provided with a tower back stop 50 connected to the tower boom 20 and the main frame 3a. The main frame 3a is provided with a gantry 11 on which an unillustrated sheave is pivotally supported at the upper end. In the main frame 3a, a main winding drum 12, a tower jib hoisting drum 13, and a tower boom hoisting drum 14 are sequentially arranged from the front to the rear. The main winding drum 12, the tower jib hoisting drum 13, and the tower boom hoisting drum 14 are each rotated by a drive motor (not shown).

  A tower strut 80, that is, a tower jib auxiliary member, is attached to the rear end portion 26 on the upper end side of the tower boom 20 so as to be swingable with respect to the tower boom 20. A tower jib 40 is attached to the front end 25 on the upper end side of the tower boom 20 so as to be raised and lowered with respect to the tower boom 20.

(Main winding rope)
One end of the main winding rope 61 is wound around the main winding drum 12. The main rope 61 is wound around the hook device 15 after being wound around the second sheave 102 pivotally supported by the tower boom 20 and the third sheave 103 pivotally supported at the tip of the tower jib 40. A plurality of third sheaves 103 are arranged on the same axis, and a plurality of hook sheaves 15 a (see FIG. 2) are attached to the hook device 15. The main winding rope 61 includes the third sheave 103 and the hook device 15. The hook sheave 15a is wound a plurality of times. The other end side of the main winding rope 61 is attached to a rope socket attachment portion (not shown) provided near the upper end side of the tower jib 40. The other end side of the main winding rope 61 may be attached to a rope socket attachment portion provided in the hook device 15.

(Tower hoisting rope)
One end of the tower hoisting rope 63 is wound around the tower boom hoisting drum 14. The tower hoisting rope 63 is wound a plurality of times between a sheave (not shown) of the tower bail 71 and a sheave (not shown) of the tower bridle 72 via a sheave (not shown) pivotally supported by the gantry 11. Has been. The other end of the tower hoisting rope 63 is hooked to the tower bail 71. One end of a tower undulation support pendant rope 64 is attached to the tower bridle 72. The other end of the tower undulation support pendant rope 64 is attached to the upper end of the tower boom 20. The tower undulation support pendant rope 64 includes a linking mechanism 90 at an intermediate portion in the length direction. The linkage mechanism 90 will be described later.

  By winding or unwinding the tower hoisting rope 63 by the tower boom hoisting drum 14, the tower bridle 72 moves so as to approach or separate from the tower bail 71. As a result, the tower boom 20 is raised and lowered via the tower raising and lowering support pendant rope 64 that connects the tower bridle 72 and the tower boom 20.

(Tower jib hoisting rope)
One end of the tower jib hoisting rope 62 is wound around the tower jib hoisting drum 13. The tower jib hoisting rope 62 is wound a plurality of times between a sheave (not shown) of the tower jib bail 73 and a sheave (not shown) of the tower jib bridle 74. The other end of the tower jib hoisting rope 62 is hooked on the tower jib bail 73. One end side of a post support pendant rope 65 is attached to the tower jib bridle 74. The other end of the post support pendant rope 65 is attached to one end 84 a of the tower strut 80 via the first sheave 101. One end side of a tower jib support pendant rope 66 is attached to the other end 84 b of the tower strut 80. The other end of the tower jib support pendant rope 66 is attached to the tip of the tower jib 40.
In FIGS. 1 and 2, the ropes 61 to 66 are shown by thick lines for clarity of the drawings.

(Tower strut)
The tower strut 80 includes a first frame body 81, a second frame body 82, and a connecting body 83. One end of the first frame 81 and one end of the second frame 82 are rotatably connected by a connecting member (not shown), and the other end of the first frame 81 and the other end of the second frame 82 are Each is connected to one end and the other end of the connecting body 83. Thereby, the tower strut 80 is formed in a triangular shape as a whole. A connecting member that connects the first frame body 81 and the second frame body 82 is pivotable to a support shaft 29 (see FIGS. 1 and 32) inserted through the rear end portion 26 on the upper end side of the tower boom 20. It is supported. A connecting portion between the second frame body 82 and the connecting body 83 is one end portion 84a of the tower strut 80 described above, and the other end side of the post support pendant rope 65 is attached. A connecting portion between the first frame body 81 and the connecting body 83 is the other end portion 84b of the tower strut 80 described above, and one end side of the tower jib support pendant rope 66 is attached.

The connecting body 83 is formed of two divided pieces that are rotatably connected. The 1st frame 81 and the 2nd frame 82 are connected so that rotation is mutually possible. Thereby, the tower strut 80 can be folded at the intermediate part of the coupling body 83 at the time of conveyance.
Although not shown, the first and second frame bodies 81 and 82 and the connecting body 83 are arranged in pairs on the left and right sides, and are connected to each other by a plurality of connecting members extending in the left-right direction. It has a three-dimensional structure.

(Tower jib undulation operation)
In the state in which the tower jib 40 illustrated in FIG. 1 is stored, the tower jib briddle 74 approaches the tower jib bail 73 side by winding the tower jib hoisting rope 62 with the tower jib hoisting drum 13. Thereby, the post support pendant rope 65 moves to the tower jib bail 73 side. For this reason, the tower strut 80 rotates counterclockwise in FIG. 1 around the support shaft 29 that is pivotally supported by the rear end portion 26 on the upper end side of the tower boom 20. As the tower strut 80 rotates counterclockwise, the tower jib support pendant rope 66 is pulled upward. Then, the tower jib 40 to which one end side of the tower jib support pendant rope 66 is attached rotates counterclockwise around the support shaft that is pivotally supported by the front end portion 25 on the upper end side of the tower boom 20. That is, the tower jib 40 stands up.

In the state of FIG. 2 showing the working posture of the tower crane 1, the moment force due to the weight of the tower jib 40 acts on the other end 84 b of the tower strut 80 via the tower jib support pendant rope 66. The tower strut 80 is maintained at an arbitrary undulation angle against the moment force due to the weight of the tower jib 40 by a post support pendant rope 65 attached to one end 84 a of the tower strut 80. When the tower jib hoisting rope 62 is unwound by the tower jib hoisting drum 13 from the state where the tower jib 40 is erected, the tower jib 40 is rotated clockwise by its own weight. At the same time, the tower strut 80 rotates clockwise about the support shaft 29 of the rear end portion 26 on the upper end side of the tower boom 20. Then, the tower jib 40 is finally held in a state of being disposed substantially parallel to the tower boom 20 as shown in FIG. Therefore, the tower jib hoisting drum 62 by the tower jib hoisting drum 13 can be adjusted to adjust the winding amount and the unwinding amount of the tower jib hoisting rope 62 so that the tower jib 40 that does not expand and contract can be fixed at an arbitrary angle until standing upright.
In addition, the tower jib 40 is normally fixed to the tower boom 20 by the tower jib coupling device 16 in the holding state illustrated in FIG. The tower jib coupling device 16 can use, for example, a structure similar to a tower jib holding mechanism 160 described later.

(Tower jib back stop)
The tower jib backstop 86 is rotatably attached to the tower jib 40 at one end 86a. The other end 86b of the tower jib backstop 86 is a free end (see FIG. 1). In the vicinity of the other end 86 b of the tower jib backstop 86, a support member 87 that connects the tower jib backstop 86 and the tower jib 40 is provided. The support member 87 has a structure that can be folded at an intermediate position. By rotating the tower jib backstop 86 while folding the support member 87, the tower jib backstop 86 can be stored in the storage position that is close to the tower jib 40.

  The support member 87 is normally in a released state, and the tower jib backstop 86 rotates together with the tower jib 40 in this state. When the tower jib 40 stands up at a predetermined angle, the other end 86b of the tower jib backstop 86 comes into contact with a locking member (not shown) provided at the upper end of the tower boom 20, as shown in FIG. As a result, the tower jib 40 is restricted from rotating further counterclockwise, that is, standing up is restricted. That is, the tower jib backstop 86 mechanically limits the rotation range of the tower jib 40 so that the tower jib 40 does not rotate more than the maximum angle.

(Tower back stop)
FIG. 23A is a side view of the tower backstop 50, and FIG. 23B is an enlarged sectional view taken along line XXIIIb-XXIIIb in FIG.
The tower back stop 50 limits the rotation range of the tower boom 20 so that the tower boom 20 does not rotate more than the maximum angle.
The tower backstop 50 includes an outer cylinder 51, an inner cylinder 52, and a compression spring 53.
At one end of the outer cylinder 51, an attachment member 54 that is rotatably attached to the tower boom 20 is provided. The attachment member 54 is pivotally supported by a pin 54 a on an attachment portion (not shown) provided on the tower boom 20. The inner cylinder 52 is slidably attached to the inner side of the outer cylinder 51. At one end of the inner cylinder 52, a holding member 55 that is rotatably attached to the main frame 3a is provided. The holding member 55 is pivotally supported on the main frame 3a by a pin 55a. The compression spring 53 is inserted between the outer periphery of the inner cylinder 52 and is provided between the other end 51 b of the outer cylinder 51 and the holding member 55. The compression spring 53 is always in a compressed state, and urges the outer cylinder 51 toward the tower boom 20 side.

As shown in FIG. 23B, the outer cylinder 51 is provided with a pin hole 51 a at an intermediate position in the length direction. The inner cylinder 52 is provided with a pin hole 52a at an intermediate position in the length direction. The restriction pin 57 can be inserted into and removed from the pin hole 51 a of the outer cylinder 51 and the pin hole 52 a of the inner cylinder 52.
Although not shown, a limit switch that is linked to the displacement of the outer cylinder 51 is arranged on the main frame 3a.

As the tower boom 20 stands, the outer cylinder 51 moves downward while compressing the compression spring 53. When the tower boom 20 stands at a predetermined angle, a signal is output via the limit switch, and a drive motor (not shown) that drives the tower boom hoisting drum 14 stops. For this reason, the tower boom 20 is held at this maximum standing angle. Usually, the maximum standing angle of the tower boom 20 is approximately 90 degrees.
In a state where the tower boom 20 is inclined forward by a predetermined angle described later, the pin hole 51a of the outer cylinder 51 and the pin hole 52a of the inner cylinder 52 are in the same position, and the restriction pin 57 can be inserted and removed.
In the above description, the inner cylinder 52 side through which the compression spring 53 is inserted is fixed to the main frame 3 a and the outer cylinder 51 side is fixed to the tower boom 20. However, the inner cylinder 52 side through which the compression spring 53 is inserted may be fixed to the tower boom 20 and the outer cylinder 51 side may be fixed to the main frame 3a.

(Tower Jib)
As shown in FIG. 1, the tower jib 40 includes an upper tower jib 41, a lower tower jib 42, and a connecting mechanism 110 that rotatably connects the upper tower jib 41 and the lower tower jib 42.
22A is a side view showing the coupling mechanism 110 of the upper and lower tower jibs 41 and 42, and FIG. 22B is a side view from the front of FIG. 22A. 22 (a) and 22 (b) are enlarged views showing that the tower jib 40 is held in a state in which the tip side where the third sheave 103 is provided is downward as shown in FIG. FIG.
The upper and lower tower jibs 41 and 42 each have a pair of main members 41a and 42a on the front side and a pair of main members 41b and 42b (see FIGS. 1 and 2) on the rear side. That is, each of the upper and lower tower jibs 41 and 42 has a structure in which a pair of main members 41a and 41b or 42a and 42b are arranged on the front side and the rear side at each rectangular corner. The main materials 41a, 41b, 42a, 42b are formed of, for example, a round pipe material. The pair of main members 41a and 42a on the front side of each of the upper and lower tower jibs 41 and 42 and the pair of main members 41b and 42b on the rear side are illustrated in the state where the tower jib 40 illustrated in FIG. The front and back are opposite to the holding state shown in FIG.

Since the connection mechanism 110 between the upper tower jib 41 and the lower tower jib 42 is the same on the front side and the rear side, the front side connection mechanism 110 will be described below.
Connection end portions 43 and 44 are provided on the end portions on which the main members 41a and 42a face each other. In FIG.22 (b), the centerline of the connection end part 44 is located on the centerline of the main material 42a. In addition, the pair of connection end portions 43 are provided in a pair symmetrically with respect to the center line of the main material 41a. The connecting end portion 44 is inserted into the separation portion of the connecting end portion 43. Each connecting end 43 and connecting end 44 is provided with through holes 43a and 44a penetrating in the left-right direction. The upper end tower jib 41 and the lower tower jib 42 are rotatably connected by inserting the connecting end portion 44 into the separation portion of the connecting end portion 43 and inserting the rotating connecting pin 45 into the through holes 43a and 44a.
Note that the connection mechanism between the main member 41b and the main member 42b on the rear side may not be rotatable but may be connected using a fastening member or the like.

(Tower boom)
As shown in FIGS. 1 and 2, the tower boom 20 includes an upper tower boom 21, a lower tower boom 22, a tower boom foundation 23, a folding mechanism 30, and a connecting mechanism 120. The folding mechanism 30, that is, the boom connecting mechanism connects the upper tower boom 21 and the lower tower boom 22 so that they can be folded. The connection mechanism 120 connects the lower tower boom 22 and the tower boom foundation 23.

(First embodiment of the folding mechanism)
24 is a side view showing the first embodiment of the folding mechanism 30 of the upper and lower tower booms 21 and 22, and FIGS. 25 (a) to 25 (d) show the operation of the folding mechanism 30 shown in FIG. FIG.
Each of the upper and lower tower booms 21 and 22 has a pair of main members 21a and 22a on the front side and a pair of main members 21b and 22b on the rear side. Pin holes 31b and 32b (see FIG. 25) are formed in the lower end connecting portion 31 of the main member 21b on the rear side of the upper tower boom 21 and the upper end connecting portion 32 of the main member 22b on the rear side of the lower tower boom 22, respectively. Has been. A rear pin 152 can be inserted into and removed from the pin holes 31b and 32b. Pin holes 31a and 32a are formed in the lower end connecting portion 31 of the main material 21a on the front side of the upper tower boom 21 and the upper end connecting portion 32 of the main material 22a on the front side of the lower tower boom 22, respectively (see FIG. 25). A front pin 151 can be inserted into and removed from the pin holes 31a and 32a.

  A rotation link 33 is attached to the front side surface on the lower end side of the main material 21 a of the upper tower boom 21. A rotation support link 34 is attached to the front side surface on the upper end side of the main material 22 a of the lower tower boom 22. One end portion of the rotation support link 34 extends upward from the upper end portion of the main member 22 a and overlaps the rotation link 33. Rotation holes are respectively provided in portions where the rotation support link 34 and the rotation link 33 overlap each other, and a connecting pin 153 is inserted into the rotation hole. That is, the connecting pin 153 is positioned in front of the front pin 151 to which the main material 21a of the upper tower boom 21 and the main material 22a of the lower tower boom 22 are connected. The upper tower boom 21 is rotatable about the connecting pin 153 as a support shaft.

The operation of the upper tower boom 21 by the folding mechanism 30 shown in FIG. 24 will be described with reference to FIGS.
The front pin 151 inserted through the pin hole 31a of the lower end connecting portion 31 of the main material 21a and the pin hole 32a of the upper end connecting portion 32 of the main material 22a is pulled out. Further, the rear pin 152 inserted through the pin hole 31b of the lower end connecting portion 31 of the main member 21b and the pin hole 32b of the upper end connecting portion 32 of the main member 22b is pulled out. In this state, the upper tower boom 21 is rotated clockwise about the connecting pin 153 as a support shaft, that is, it falls down forward (see FIG. 25A). FIGS. 25B to 25D show a state in which the angle of the upper tower boom 21 that rotates clockwise is gradually increased. In the upper tower boom 21, a connecting pin 153 serving as a center of rotation is positioned in front of the front pin 151 inserted through the pin hole 31a of the main material 21a and the pin hole 32a of the main material 22a. Therefore, the main material 21a of the upper tower boom 21 and the main material 22a of the lower tower boom 22 do not interfere with each other, and the main material 21a of the upper tower boom 21 is substantially parallel to the main material 22a of the lower tower boom 22. It can be rotated to the position.

  As shown in FIGS. 1 and 2, the coupling mechanism 120 has the same structure as the coupling mechanism 110. That is, the main material 23b on the rear side of the tower boom foundation 23 and the main material 22b on the rear side of the lower tower boom 22 in FIGS. 1 and 2 are connected to each other by a connecting pin (not shown). The main material 23a on the front side of the tower boom base 23 and the main material 22a on the front side of the lower tower boom 22 may be connected so as to be rotatable, but are connected detachably by a fastening member or the like. Also good.

(Linking mechanism of tower undulation support pendant rope)
The tower undulation support pendant rope 64 includes an upper tower undulation support pendant rope 64a, a lower tower undulation support pendant rope 64b, and a linkage mechanism 90. The linkage mechanism 90 links the upper tower undulation support pendant rope 64a and the lower tower undulation support pendant rope 64b in a separable manner.

FIG. 21A is a side view showing a state in which the lower tower undulation support pendant rope 64b is connected to the lower tower boom 22, and FIG. 21B is a cross-sectional view taken along the line XXIb-XXIb in FIG. FIG. 21C is an enlarged sectional view taken along line XXIc-XXIc of FIG.
The linkage mechanism 90 includes a linkage link 91, a support link 92, a fixing bracket 93 provided at the upper end portion of the lower tower boom 22, and pins 94 a to 94 c. The link 91 is a plate-like member having a thick one end 91a and the other end 91b. The support link 92 has a pair of support plates 92a that are spaced apart from each other in the thickness direction. An eye end sleeve 67 provided at the upper end of the lower tower undulation support pendant rope 64b is inserted into the lower portion of the pair of support plates 92a. The other end portion 91b of the connecting link 91 is inserted into the separation portion on the upper side of the pair of support plates 92a. One end portion 91a of the link 91 is inserted between the U-shaped end portions of the fork end sleeve 68 provided at the lower end portion of the upper tower undulation support pendant rope 64a.

  The pair of support plates 92a and the eye end sleeve 67 are rotatably attached by pins 94a that are inserted through pin holes provided in the support plates 92a and the eye end sleeve 67, respectively. The pair of support plates 92a and the link 91 are rotatably attached by pins 94b inserted into pin holes provided in the support plates 92a. The connecting link 91 and the fork end sleeve 68 are rotatably attached by a pin 94c that is inserted into a pin hole provided in each. Usually, that is, when the tower crane 1 is not disassembled, the pins 94a to 94c are inserted into predetermined places, and the upper tower undulation support pendant rope 64a and the lower tower undulation support pendant rope 64b are connected via the connection mechanism 90. Has been. As shown in FIGS. 1 and 2, in this state, the upper end side of the upper tower undulation support pendant rope 64 a is fixed to the upper end portion of the tower boom 20.

  The support link 92 of the linkage mechanism 90 can be attached to a fixing bracket 93 attached to the lower tower boom 22. The gap between the separated portions of the pair of support plates 92 a is formed larger than the plate thickness of the fixing bracket 93. In order to attach the support link 92 to the fixing bracket 93, the fixing bracket 93 is inserted into the space between the pair of support plates 92a, and mounting pins are inserted into the through holes provided in the pair of support plates 92a and the fixing bracket 93. 95 is inserted. A sectional view of this state is shown in FIG. The mounting pin 95 can be inserted into and removed from the through holes provided in the pair of support plates 92 a and the fixing bracket 93. Before attaching the support link 92 to the fixing bracket 93, the work is facilitated by removing the pin 94c and separating it from the upper tower undulation support pendant rope 64a. By doing in this way, the support of the tower boom 20 by the tower undulation support pendant rope 64 can be transferred from the upper end of the tower boom 20 to the intermediate portion of the tower boom 20.

(Tower strut 80)
A lock mechanism 180 that holds the tower strut 80 in a predetermined posture, that is, a tower jib auxiliary member coupling mechanism is provided at the upper end of the tower boom 20 (see FIG. 32).
As described in the description of the tower jib raising / lowering operation, in the state of FIG. It is maintained at an arbitrary undulation angle against the moment force. Therefore, when the post support pendant rope 65 or the tower jib support pendant rope 66 is detached from the tower strut 80, the tower strut 80 may be swung by an external force, such as wind. When the tower jib 40 illustrated in FIG. 1 is held, the tower jib support pendant rope 66 is loose, and the tower strut 80 is not subjected to tension from the tower jib support pendant rope 66. For this reason, in this state, the tower strut 80 may swing backward.
The lock mechanism 180 is for locking the tower strut 80 in such an unstable state. Hereinafter, the lock mechanism 180 will be described.

FIG. 32 is an enlarged view of a region XXXII around the tower strut 80 in FIG. 1, and FIG. 33 is a diagram showing a state in which the tower strut 80 is locked by the lock mechanism 180 in FIG. 34 is a cross-sectional view taken along line XXXIV-XXXIV in FIG. 35 is an enlarged view of the locking mechanism 180 in the released state illustrated in FIG. 33, and FIG. 36 is an enlarged view illustrating the locking state of the locking mechanism 180 illustrated in FIG.
The lock mechanism 180 includes a pair of connection links 181, a release lever 182, a support member 183, a pair of return springs 184, a support shaft 185, and a pair of engagement pins 186.
The support member 183 extends in the left-right direction, and is attached to the holding member 24 provided on the tower boom 20 by a U-shaped attachment bracket 192 at each end. The holding member 24 is formed of, for example, a round pipe material.

  The support member 183 is provided with a fixed piece 183a. A support shaft 185 extending in the left-right direction is attached to the support member 183 so as to be rotatable with respect to the support member 183. Each engagement pin 186 is fixed to the left and right second frame bodies 82 of the tower strut 80. Each connection link 181 is fixed to each of the left and right ends of the support shaft 185. A hook portion 181 a is formed at the tip of the connecting link 181. A release lever 182 is attached to the opposite side of the connecting link 181 from the hook portion 181a. A return spring 184 formed of a tension spring is suspended from the release lever 182 and the fixed piece 183a.

  The release lever 182 is always urged toward the fixed piece 183a by the return spring 184. A release handle 191 is attached to the lower end of the release lever 182. The release handle 191 is suspended to a position where the operator in the ground or the cab 4 can operate. When the release handle 191 is pulled downward, the connecting link 181 is rotated counterclockwise together with the release lever 182. This state is a released state in which the hook portion 181a of the connection link 181 is disengaged from the engagement pin 186.

  In a state where no tension is applied to the release handle 191, the connecting link 181 rotates together with the release lever 182 in the clockwise direction by the biasing force of the return spring 184. As shown in FIGS. The hook portion 181 a of 181 is locked with the engagement pin 186. For this reason, the tower strut 80 is connected to the tower boom 20 via the connection link 181 and its rotation is restricted. When the tower jib 40 is folded into the tower boom 20, the tower strut 80 is locked by the lock mechanism 180 except when the tower strut 80 is disassembled.

(Tower jib holding mechanism)
As illustrated in FIG. 1, the tower crane 1 further includes a tower jib holding mechanism 160 that holds the lower tower jib 42 on the upper tower boom 21. The tower jib holding mechanism 160 is provided above the coupling mechanism 110. The tower jib holding mechanism 160 is operated in a process of disassembling the tower crane 1. Hereinafter, the tower jib holding mechanism 160 will be described.
37 is a cross-sectional view taken along line XXXVII in FIG. 1, FIG. 38 is a side view seen from the x direction in FIG. 37, and FIG. 39 is a side view showing a state in which the lower tower jib 42 is held in FIG. It is.
The tower jib holding mechanism 160 includes a pair of holding links 161, a release lever 162, a support member 163, a pair of return springs 164, a support shaft 165, and an engagement shaft 166.
The support member 163 extends in the left-right direction, and is attached to the main member 21a on the front side of the upper tower boom 21 by a U-shaped attachment bracket 172 at each end.

  The support member 163 is provided with a fixed piece 163a. A support shaft 165 extending in the left-right direction is attached to the support member 163 so as to be rotatable with respect to the support member 163. The engaging shaft 166 extends in the left-right direction in parallel with the support shaft 165, and is attached to the main member 42 b on the rear side of the lower tower jib 42 by a U-shaped mounting bracket 173. The engaging shaft 166 is formed longer than the interval between the main members 21a on the front side, and both end portions protrude leftward or rightward from the main member 21a. The holding link 161 is fixed to each of the left and right ends of the support shaft 165. A hook portion 161 a is formed at the tip of the holding link 161. A release lever 162 is attached to the side of the holding link 161 opposite to the hook portion 161a. A return spring 164 formed of a tension spring is suspended from the release lever 162 and the fixed piece 163a.

  The release lever 162 is always urged toward the fixed piece 163a by the return spring 164. A release handle 171 is attached to the distal end side of the release lever 162. The release handle 171 is suspended to a position where the operator in the ground or the cab 4 can operate. When the release handle 171 is pulled downward, the holding link 161 is rotated counterclockwise together with the release lever 162, and as shown in FIG. 38, the released state is released from the engaging shaft 166. In the state where the release handle 171 is not pulled, as shown in FIG. 39, the holding link 161 is rotated clockwise, the hook portion 161a is engaged with the engaging shaft 166, and the lower tower jib 42 is upper. It is fixed to the tower boom 21.

[Disassembly of tower crane]
A method for disassembling the tower crane 1 will be described with reference to FIGS.
The disassembly process of the tower crane 1 is roughly divided into the following four stages.
First stage (see FIGS. 3 to 7): Separation of upper tower jib 41 Second stage (see FIGS. 8 to 12): Folding of upper tower boom 21 Third stage (see FIGS. 13 to 16): Upper tower boom 21 separation 4th stage (see FIGS. 17 to 19): separation of lower tower boom 22 Hereinafter, each stage will be described in order.

(First stage): Separation process 1 and 1 of the upper tower jib 41 (see FIG. 3);
In the state where the tower jib 40 shown in FIG. 1 is held, the hook device 15 is separated from the main winding rope 61. The end of the main winding rope 61 is removed from a rope socket mounting portion (not shown) provided near the upper end side of the tower jib 40, and the hook device 15 is removed from the main winding rope 61. In the state in which the tower jib 40 is held, the tower boom 20 is in a state of standing at approximately 90 degrees which is the maximum angle. Further, the lock mechanism 180 of the tower strut 80 is in a locked state in which the hook portion 181a of the connection link 181 is engaged with the engagement pin 186 as shown in FIGS. Further, in the tower jib holding mechanism 160, no tension is applied to the release handle 171, and the lower tower jib 42 in which the hook portion 161a of the holding hook 161 is engaged with the engaging shaft 166 as shown in FIG. Is in the holding state.
When the tower crane 1 is in the working state illustrated in FIG. 2, the tower boom 20 illustrated in FIG. Moreover, when the tower jib 40 is being fixed to the tower boom 20 by the tower jib coupling device 16, the tower jib coupling device 16 is made into an open state.
Note that the main winding rope 61 is wound around the main winding drum 12 in a process described later, but is not performed when the tower boom 20 is standing. The reason is that when the main winding rope 61 is taken up while the tower boom 20 is standing, the portion of the main winding rope 61 on the front side of the tower boom 20 is shorter than the portion on the rear side of the tower boom 20. This is because the main winding rope 61 escapes to the rear side of the tower boom 20 due to its own weight.

Steps 1 and 2 (see FIG. 4);
The tower jib bridle 74 is fixed to the tower jib bail 73 by the following procedure.
(1) The tower jib bridle 74 is suspended and held by an auxiliary crane (not shown).
(2) Remove the post support pendant rope 65 from the tower jib bridle 74.
(3) While lowering the auxiliary crane, the tower jib hoisting rope 62 is wound around the tower jib hoisting drum 13 and the tower jib bridle 74 is moved closer to the tower jib bail 73.
(4) When the tower jib bridle 74 reaches the tower jib bail 73, the tower jib bridle 74 is fixed to the tower jib bail 73.

  FIG. 20 is a side view showing a structure for fixing the tower jib bridle 74 to the tower jib bail 73. The tower jib bail 73 has a plurality of sheaves 73b that are rotatably supported by the support shaft 73a. The tower jib bail 73 is fixed to the main material 23b on the rear side of the tower boom base 23. The tower jib bridle 74 has a plurality of sheaves 74b that are pivotally supported by a support shaft 74a. A tower jib hoisting rope 62 is wound around the plurality of sheaves 73b of the tower jib bail 73 and the plurality of sheaves 74b of the tower jib bridle 74 a plurality of times. When the tower jib hoisting rope 62 is wound around the tower jib hoisting drum 13, the tower jib bridle 74 gradually approaches the tower jib bail 73.

  A stop pin hole is provided in the lower end portion of the tower jib bridle 74 and the upper end portion of the tower jib bail 73. When the lower end of the tower jib bridle 74 reaches a position where it overlaps the upper end of the tower jib bail 73, the stop pin holes of the tower jib bridle 74 and the tower jib bail 73 are aligned, and the stop pin 75 is inserted. . Thereby, the tower jib bridle 74 is fixed to the tower boom foundation 23 via the tower jib bail 73. The tower jib bridle 74 may be directly fixed to the tower boom base 23.

Steps 1 and 3 (see FIG. 5);
Remove the tower jib support pendant rope 66 from the tip of the tower jib 40.

Steps 1 and 4 (see FIG. 6);
The upper tower jib 41 is rotated to a horizontal position by the following procedure.
(1) A pin (not shown) that connects the main member 41b on the rear side of the upper tower jib 41 and the main member 42b on the rear side of the lower tower jib 42 is pulled out.
(2) The tip of the lower tower jib 42 is lifted by an auxiliary crane (not shown), and the upper tower jib 41 is rotated counterclockwise about the rotation connecting pin 45 (see FIG. 22B).
(3) When the lower tower jib 42 becomes horizontal, the auxiliary crane is stopped.
By setting the lower tower jib 42 in the procedure (1) to the holding state in which the upper tower boom 21 is held, the lower tower jib 42 is rotated in the procedures (3) and (4) and the operations shown in the following steps. Can be regulated. For this reason, it becomes possible to perform work safely and efficiently.

Steps 1 and 5 (see FIG. 7);
The upper tower jib 41 is separated from the lower tower jib 42 by the following procedure.
(1) The base side of the lower tower jib 42 is held by an auxiliary crane (not shown), and is held by an auxiliary crane (not shown) so that the lower tower jib 42 is maintained in a horizontal state.
(2) The pivoting connection pin 45 (see FIG. 22B) that connects the upper tower jib 41 and the lower tower jib 42 is pulled out.
(3) The auxiliary crane is moved to separate the upper tower jib 41 from the lower tower jib 42.

(Second stage): Folding process 2.1 of the upper tower boom 21 (see FIG. 8);
According to the following procedure, the support of the tower boom 20 is transferred from the support by the entire tower undulation support pendant rope 64 to the support by the lower tower undulation support pendant rope 64b alone.
(1) The tower hoisting rope 63 is unwound from the tower boom hoisting drum 14, and the tower boom 20 is tilted forward by a predetermined angle. This predetermined angle is an angle at which the pin hole 51a of the outer cylinder 51 of the tower backstop 50 and the pin hole 52a of the inner cylinder 52 are at the same position (see FIGS. 23A and 23B).
(2) The restriction pin 57 is inserted into the pin hole 51 a of the outer cylinder 51 of the tower backstop 50 and the pin hole 52 a of the inner cylinder 52. Thereby, sliding of the outer cylinder 51 with respect to the inner cylinder 52 is regulated. For this reason, the tower boom 20 is restricted from rotating by the tower backstop 50 and is held at the predetermined angle. Therefore, until then, the load on the tower undulation support pendant rope 64 that holds the inclination of the tower boom 20 is free.

(3) The pin 94c which connects the upper tower hoisting support pendant rope 64a and the connecting link 91 is pulled out, and the upper tower hoisting support pendant rope 64a is separated from the connecting mechanism 90 (see FIGS. 21A and 21B).
(4) The support link 92 is inserted into the fixing bracket 93 and fixed to the fixing bracket 93 by the mounting pins 95 (see FIGS. 21A to 21C).
(5) The tower jib hoisting rope 62 is wound up by the tower boom hoisting drum 14, and the tower boom 20 can be supported only by the lower tower hoisting support pendant rope 64b.
(6) The restriction pin 57 inserted through the outer cylinder 51 and the inner cylinder 52 of the tower backstop 50 is removed, and the tower boom 20 is supported only by the lower tower undulation support pendant rope 64b. Thereby, the support of the tower boom 20 is transferred from the support by the whole tower undulation support pendant rope 64 to the support by only the lower tower undulation support pendant rope 64b. That is, the upper tower boom 21 is released from being restrained by the upper tower undulation support pendant rope 64a and becomes free.

Steps 2 and 2 (see FIGS. 9 to 11);
The upper tower boom 21 is folded by the following procedure.
(1) The upper end side of the upper tower boom 21 is held by an auxiliary crane (not shown).
(2) The front and rear pins 151 and 152 of the folding mechanism 30 shown in FIG. 24 are connected to the front and rear main members 21a and 21b of the upper tower boom 21 and the front and rear main members of the lower tower boom 22. Remove from 22a, 22b.
(3) While lowering the lifting tool (not shown) of the auxiliary crane, as shown in FIG. 25A, the upper tower boom 21 is rotated clockwise about the axis of the connecting pin 153. To go. In other words, it folds forward.
9 to 11 show a state in which the folding of the upper tower boom 21 progresses, that is, tilts forward as the auxiliary crane is lowered. As shown in FIG. 10, with the upper tower boom 21 in a substantially horizontal state, the release handle 191 of the locking mechanism 180 of the tower strut 80 is pulled downward to connect as shown in FIGS. The hook portion 181a of the link 181 is brought into a released state in which it is released from the engagement pin 186.

In addition, in the above, as an auxiliary crane used when folding the upper tower boom 21, a rough terrain crane (or rough terrain crane) provided with a telescopic boom, an all terrain crane, etc. can be used, for example.
The rough terrain crane has a structure in which a plurality of booms, which are thinner toward the tip side, are mounted on a four-wheel drive traveling body so as to be raised and lowered. Each boom is slidable with the inner wall surface of the boom on the outer peripheral side as a guide surface. That is, the booms of a plurality of stages can be expanded and contracted. The rough terrain crane can travel on rough terrain with the boom lying down, and does not require assembly. In other words, if you arrive at the site and extend the boom and outrigger, you can start working immediately. In addition, after the work is completed, it is possible to return from the site by simply storing the boom and the outrigger. However, since the lifting capacity is generally low, the crane is often used as an auxiliary crane for a construction machine having a high lifting capacity.
Although not specifically described, the rough terrain crane can be used in other processes where the auxiliary crane is used. Moreover, when an auxiliary crane with a low height to be used may be used, a normal wheel crane can be used.

Steps 2 and 3 (see FIG. 12);
With the tower strut 80 being grounded, the folding of the upper tower boom 21 is finished. As shown in FIG. 12, the tower strut 80 is grounded in a posture in which the connecting body 83 faces the ground. In this state, one end of the tower jib support pendant rope 66 is removed from the other end 84 b of the tower strut 80. The removed tower jib support pendant rope 66 is tied to the upper tower jib 41, for example. Alternatively, it is stored in a predetermined storage location.

Third stage: separation step 3.1 of the upper tower boom 21 (see FIG. 13);
The tower strut 80 is removed from the upper tower boom 21 by the following procedure.
(1) Remove the other end of the post support pendant rope 65 from the one end 84 a of the tower strut 80. The removed post support pendant rope 65 is secured to the upper tower boom 21, for example. Alternatively, it is stored in a predetermined storage location.
(2) The upper tower undulation support pendant rope 64a attached to the upper end side of the upper tower boom 21 is removed. The removed upper tower undulation support pendant rope 64 a is secured to the upper tower boom 21, for example. Alternatively, it is stored in a predetermined storage location.
(3) The support shaft 29 that supports the tower strut 80 on the rear end portion 26 on the upper end side of the tower boom 20 is pulled out.
(4) The tower strut 80 is detached from the upper tower boom 21 and separated by the auxiliary crane.

Steps 3 and 2 (see FIG. 14);
The tower hoisting rope 63 is unwound by the tower boom hoisting drum 14 and the upper side of the upper tower boom 21 is grounded. At this time, the tip of the support member 87 of the tower jib backstop 86 is similarly grounded. The upper tower boom 21 and the support member 87 are not necessarily installed as long as they are located near the ground.

Steps 3 and 3 (see FIG. 15);
The tower jib backstop 86 is stored.
The tower jib backstop 86 is rotated while the support member 87 is folded at the center. That is, the tower jib backstop 86 is stored in a closed state.

Steps 3 and 4 (see FIG. 16);
The upper tower boom 21 including the upper tower jib 41 is separated from the lower tower boom 22 by the following procedure.
(1) The lower end side (upper side in FIG. 16) of the upper tower boom 21 is held by an auxiliary crane (not shown).
(2) The connecting pin 153 (see FIG. 24) of the folding mechanism 30 that connects the main member 21a of the upper tower boom 21 and the main member 22a of the lower tower boom 22 is pulled out.
(3) The upper tower boom 21 including the upper tower jib 41 is moved by the auxiliary crane and separated from the lower tower boom 22.

(Fourth stage): Separation process 4.1 of the lower tower boom 22 (see FIG. 17);
The tower hoisting rope 63 is unwound by the tower boom hoisting drum 14 and the lower tower boom 22 is grounded.
Thereafter, the main winding rope 61 is wound around the main winding drum 12.
After the lower tower boom 22 is grounded, the main winding rope 61 can be wound up. The winding of the main winding rope 61 may be performed in any process as long as it is a subsequent process.

Step 4.2 (see FIG. 18);
The lower tower boom 22 is separated from the tower boom foundation 23 by the following procedure.
(1) The tower hoisting rope 63 is unwound from the tower boom hoisting drum 14, and the tower bridle 72 is lowered and transferred onto the lower tower boom 22.
(2) The tower bridle 72 is fixed to the lower tower boom 22. Although not shown, for example, a method of fixing to a fixing member provided on the lower tower boom 22 by a fixing pin or a fastening member can be used.
(3) Pull out a connecting pin (not shown) on the front side of the connecting mechanism 120 that connects the tower boom foundation 23 and the lower tower boom 22. That is, the connecting pin that connects the main material 23a on the front side (lower side in FIG. 18) of the tower boom foundation 23 and the main material 22a on the front side (lower side in FIG. 18) of the lower tower boom 22 is removed.
(4) A connecting pin (not shown) that connects the main material 23b on the rear side (upper side in FIG. 18) of the tower boom foundation 23 and the main material 22b on the rear side (upper side in FIG. 18) of the lower tower boom 22. )). As a result, the entire lower tower boom 22 is grounded and separated from the tower boom foundation 23.
In this state, the lower tower undulation support pendant rope 64b is detached from the linkage mechanism 90 and the tower bridle 72 and secured to the upper tower boom 21. Alternatively, it is stored in a predetermined storage location. In order to remove the lower tower undulation support pendant rope 64b from the linkage mechanism 90, the pin 94a connecting the lower tower undulation support pendant rope 64b to the support link 92 in FIG.

Steps 4 and 3 (see FIG. 19);
The lower tower boom 22 separated from the tower boom foundation 23 is transferred using an auxiliary crane (not shown).

FIG. 40 is a view for explaining the length of space that can be reduced when the tower crane according to the present invention is disassembled.
In the conventional disassembling method described in Patent Document 1, the tower boom is pivoted about a fulcrum O pivotally supported by the main frame in a state where the tower jib is held in the tower boom and grounded. In this method, the tower boom is substantially horizontal when the tower boom is grounded. For this reason, the space of the total length L of the tower boom full length and the height of the tower strut 80 is required ahead from the fulcrum O. That is,
L = (the length of the lower tower boom 22 + the length of the tower boom foundation 23)
+ (Length of upper tower boom 21 + height of tower strut 80)
It becomes.

In the present embodiment, the tower boom 20 is divided into an upper tower boom 21, a lower tower boom 22, and a tower boom foundation 23. In the disassembling method described above, the state illustrated in FIG. 10 is the state that extends the longest forward. That is, the lower tower boom 22 and the tower boom foundation 23 are inclined forward while being supported by the lower tower undulation support pendant rope 64b. The upper tower boom 21 is attached to the distal end side of the lower tower boom 22 and is held substantially horizontally by the auxiliary crane. If the inclination angle of the upper tower boom 21 with respect to the horizontal is φ, the horizontal length (La) from the fulcrum O to the tip of the upper tower boom 21 is
La = (the length of the lower tower boom 22 + the length of the tower boom base 23) · cosφ
+ (Length of upper tower boom 21 + height of tower strut 80)
It is.

Therefore, in the present embodiment, compared to the conventional method, the length of the space required for disassembling the tower crane 1 is
(L-La)
= (Length of lower tower boom 22 + length of tower boom foundation 23) (1-cosφ)
It can be shortened.

According to the embodiment of the present invention, the following effects are obtained.
(1) The lock mechanism 180 which connects the tower strut 80 which is a tower jib raising / lowering auxiliary member to the tower boom 20 releasably, ie, the tower jib auxiliary member connection mechanism, was provided. The tower strut 80 can be connected to the tower boom 20 by the lock mechanism 180. For this reason, swinging of the tower strut 80 can be suppressed even in a state in which the members supporting the tower strut 80 such as the post support pendant rope 65 and the tower support pendant rope 66 are removed.

(2) The lock mechanism 180 is provided on the tower boom 20 so as to be rotatable, and includes a connecting link 181 having a hook portion 181a, and an engagement provided on the connecting link 181 to engage with the hook portion 181a of the connecting link 181. It is a simple configuration having pins 186. For this reason, assembly is easy and can be made inexpensive.

(3) The tower boom 20 includes an upper tower boom 21, a lower tower boom 22, and a folding mechanism 30 that is a boom connecting mechanism that connects the upper tower boom 21 and the lower tower boom 22. The upper tower boom 21 is provided. Even in such a configuration, the swinging of the tower strut 80 can be suppressed.

(4) The folding mechanism 30 connects the upper tower boom 21 to the lower tower boom 22 so as to be tiltable. As described above, even when the upper tower boom 21 is tilted with respect to the lower tower boom 22, the swinging of the tower strut 80 can be suppressed.

(5) The lock mechanism 180 further includes a release handle 191 capable of operating the release and connection of the lock mechanism 180 in a state where the tower boom 20 stands up at a predetermined angle and the tower jib 40 is held. In the state where the tower jib 40 is held in the tower boom 20, the tower jib support pendant rope 66 is loose, and the tower strut 80 is not subjected to the tension of the tower jib support pendant rope 66. For this reason, in this state, the tower strut 80 may swing backward. However, since the tower strut 80 can be fixed to the tower boom 20 by operating the release handle 191 and the lock mechanism 180, the tower strut 80 can be prevented from swinging backward.
Furthermore, according to the embodiment of the present invention, the following effects can be obtained.

(6) The tower boom 20 was divided into an upper tower boom 21 and a lower tower boom 22 and connected to each other by a folding mechanism 30 so as to be foldable. Further, the tower jib 40 is divided into an upper tower jib 41 and a lower tower jib 42 and is connected to be rotatable by a connecting mechanism 110. With the tower boom 20 standing at a predetermined angle and the tower jib 40 being held, the upper tower jib 41 is rotated forward by the connecting mechanism 110 and the connecting pin 45 for rotation of the connecting mechanism 110 is removed. The upper tower jib 41 is separated from the lower tower jib 42. In this state, the upper tower jib 41 is removed from the tower boom 20. Further, from this state, the upper tower boom 21 is folded by the folding mechanism 30 so that the upper end thereof faces the ground, and the connecting pin 153 is removed, so that the upper tower boom 21 is separated from the lower tower boom 22. As described above, before the upper tower boom 21 is folded, the upper tower jib 41 is removed from the lower tower jib 42. For this reason, the tip of the tower jib 40, which is longer than the lower tower boom 22, does not contact the ground, and the upper tower boom 21 can be folded.
Thereby, the length of the space required for disassembling the tower crane 1 can be reduced to a length shorter than the entire length of the tower boom 20.

(7) The folding mechanism 30 is configured such that the connecting pin 153 serving as the center of rotation is provided in front of the pin 152 to which the main material 21a of the upper tower boom 21 and the main material 22a of the lower tower boom 22 are connected. Yes. For this reason, the lower tower boom 22 can be folded so as to be substantially parallel to the upper tower boom 21.

(8) The tower jib holding mechanism 160 is provided, and the lower tower jib 42 is held by the upper tower boom 21 from the step of separating the upper tower jib 41 from the lower tower jib 42 to the step of folding the upper tower boom 21 to the ground. For this reason, in the said process, it can control that the lower tower jib 42 isolate | separates from the upper tower boom 21, and rotates independently, and can perform a work | work safely and efficiently.

(9) The sliding between the outer cylinder 51 and the inner cylinder 52 of the tower backstop 50 can be regulated by the regulation pin 57. Sliding between the outer cylinder 51 and the inner cylinder 52 of the tower backstop 50 is restricted in a state where the tower boom 20 is tilted forward by a predetermined angle. For this reason, when the mounting position of the tower undulation support pendant rope 64 to the tower boom 20 is transferred from the upper end of the tower boom 20 to the upper end of the upper tower boom 21, the tower boom 20 is temporarily held in an inclined state. Work can be done easily and efficiently.

(10) The tower boom 20 has a tower boom base portion 23 that is rotatably connected to the upper swing body 3 so that the tower boom base portion 23 and the lower tower boom 22 can be separated. For this reason, it is possible to separate the lower tower boom 22 from the tower boom foundation 23 while the tower jib bail 73 and the tower jib bridle 74 are fixed to the tower boom foundation 23, and the work is easy and efficient. It becomes.

(11) The tower hoisting support pendant rope 64 is divided into an upper tower hoisting support pendant rope 64a and a lower tower hoisting support pendant rope 64b, and the upper and lower tower hoisting support pendant ropes 64a and 64b are linked by the linkage mechanism 90. did. The linkage mechanism 90 includes a support link 92 that connects one end of each of the upper and lower tower undulation support pendant ropes 64a and 64b with pins 94a and 94c. The support link 92 can be fixed to a fixing bracket 93 provided on the lower tower boom 22 by an attachment pin 95. For this reason, the operation | work which transfers the attachment position to the tower boom 20 of the tower raising / lowering support pendant rope 64 from the upper end of the tower boom 20 to the upper end of the upper tower boom 21 can be performed easily and efficiently.

(12) Although the length of the space required for disassembling the tower crane 1 can be reduced by the above embodiment, the length of the tower boom 20 and the tower jib 40 can be made longer than before. It is also possible to do. That is, the length of the tower boom 20 and the tower jib 40 can be increased by the length that does not cause a problem within the range of the length reduced by the above embodiment. Therefore, this invention brings about the epoch-making effect of enabling construction of a higher-rise building than before.
In addition, the folding mechanism 30 is not restricted to the said embodiment, It can be set as various forms. Below, other embodiment of the folding mechanism 30 is shown.

[Second Embodiment of Folding Mechanism]
26 is a side view showing a second embodiment of the folding mechanism, and FIGS. 27A to 27D are side views showing the operation of the folding mechanism shown in FIG.
The folding mechanism 30 </ b> A of the second embodiment shows an example of a structure using a hydraulic cylinder 135 for folding the upper tower boom 21.
A projecting portion 156 is formed on the rotation link 33A fixed to the main member 21a. The protruding portion 156 is provided above the connecting pin 153 that serves as a pivot for the upper tower boom 21 and the lower tower boom 22. A projecting portion 157 is formed on the rotation support link 34A fixed to the main member 22a. The protruding portion 157 is provided below the connecting pin 153. A hydraulic cylinder 135 is pivotally supported on the protrusion 157 of the rotation support link 34A so as to be rotatable.

The tip of the rod 135a of the hydraulic cylinder 135 is rotatably attached to the protrusion 156 of the rotation link 33A. When the hydraulic cylinder 135 is contracted with the front and rear pins 151 and 152 connecting the main members 21a and 22a and the main members 21b and 22b removed, the upper tower boom 21 is rotated clockwise around the connection pin 153. Rotate. As the hydraulic cylinder 135 contracts, the hydraulic cylinder 135 rotates clockwise with the upper tower boom 21 about the shaft that is pivotally supported by the protrusion 157 of the rotation support link 34A. FIGS. 27A to 27D show a state in which the rotation angle of the upper tower boom 21 is gradually increased.
The other structure of the folding mechanism 30A of the second embodiment is the same as that of the folding mechanism 30 of the first embodiment, and the corresponding members are denoted by the same reference numerals and description thereof is omitted.

Also in the folding mechanism 30 </ b> A of the second embodiment, the upper tower boom 21 is located on the front side of the axis of the main material 21 a on the front side of the upper tower boom 21 and the main material 22 a on the front side of the lower tower boom 22. It rotates about the connecting pin 153 to be centered. For this reason, the angle which the upper tower boom 21 rotates can be enlarged.
The folding mechanism 30 </ b> A includes a hydraulic cylinder 135 that rotates the upper tower boom 21 with respect to the lower tower boom 22. For this reason, the rotation of the upper tower boom 21 can be controlled by the hydraulic cylinder 135, and it is not necessary to use an auxiliary crane when the upper tower boom 21 is folded. Thereby, the folding operation | work of the upper tower boom 21 can be performed easily and efficiently.

[Third embodiment of the folding mechanism]
Fig.28 (a) is a side view which shows 3rd Embodiment of a folding mechanism, FIG.28 (b) is the side view seen from the front of Fig.28 (a). FIGS. 29A to 29D are side views showing the operation of the folding mechanism shown in FIG.
The folding mechanism 30B of the third embodiment shows an example of a structure that is formed without using the rotation link 33 and the rotation support link 34 in the first embodiment. Although not shown, the connecting mechanism on the rear side of the upper and lower tower booms 21 and 22 in the folding mechanism 30B of the third embodiment is the same as that of the first embodiment.

  As shown in FIGS. 28A and 28B, a through hole 35 a and a through hole 35 b are formed in the lower end connecting portion 35 of the main material 21 a on the front side of the upper tower boom 21. A through hole 36 a and a through hole 36 b are formed in the upper end connecting portion 36 of the main material 22 a on the front side of the lower tower boom 22. The centers of the through hole 35a of the main material 21a and the through hole 36a of the main material 22a are provided on the central axes of the main material 21a and the main material 22a, respectively. The centers of the through hole 35b of the main material 21a and the through hole 36b of the main material 22a are provided in front of the through hole 35a or the through hole 36a, at positions where the distance from the through hole 35a or the through hole 36a is equal. Yes. The distance in the front-rear direction between the center of the through holes 35b and 36b and the center of the through holes 35a and 36a is larger than the radius of the main material 21a and the radius of the main material 22a.

  The front pin 151 is inserted into the through hole 35a of the main member 21a and the through hole 36a of the main member 22a, and the connecting pin 153 is inserted into the through hole 35b of the main member 21a and the through hole 36b of the main member 22a. (See FIG. 29 (a)). When the front pin 151 is pulled out, the upper tower boom 21 can be rotated clockwise around the connecting pin 153 (see FIG. 29B). The upper tower boom 21 is rotated so as to be in a horizontal state as shown in FIG. 29 (c), and is further parallel to the lower tower boom 22 as shown in FIG. 29 (d). It can be rotated, that is, folded up to a substantially vertical position.

  According to the folding mechanism 30B of the third embodiment, the same function as that of the folding mechanism 30 of the first embodiment can be achieved. Moreover, since the folding mechanism 30B of 3rd Embodiment can reduce a member, it can be made cheap.

[Fourth Embodiment of Folding Mechanism]
FIG. 30 (a) is a side view showing a fourth embodiment of the folding mechanism, and FIG. 30 (b) is a side view seen from the front of FIG. 30 (a). FIGS. 31A to 31D are side views showing the operation of the folding mechanism shown in FIG.
The folding mechanism 30C of the fourth embodiment shows an example of a structure that is formed without using the front pins 151 that connect the main members 21a, 22a of the upper and lower tower booms 21, 22 in the first embodiment.

  As shown in FIGS. 30A and 30B, a rotation link 37 is attached to the lower end portion of the upper tower boom 21. The rotation link 37 includes a holding portion 37a to which the lower end portion of the upper tower boom 21 is fitted, and a rotation portion 37b in which a through hole 37c is formed. A rotation link 38 is attached to the upper end portion of the lower tower boom 22. The rotation link 38 includes a holding portion 38a to which the upper end portion of the lower tower boom 22 is fitted, and a rotation portion 38b in which a through hole 38c is formed. For the fitting between the lower and upper end portions of the upper and lower tower booms 21 and 22 and the holding portions 37a and 38a, fastening by a fastening member, welding or shrink fitting can be used.

  The through hole 37 c of the rotation link 37 is located in front of the main material 21 a of the upper tower boom 21. The center in the height direction of the through hole 37c of the rotation link 37 and the lower end surface 21c of the main member 21a are located on a horizontal surface. The through hole 38 c of the rotation link 38 is located in front of the main material 22 a of the lower tower boom 22. The center in the height direction of the through hole 38c of the rotation link 38 and the upper end surface 22c of the main member 22a are positioned on a horizontal surface. The distance in the front-rear direction between the center of the through-holes 37c and 38c and the axis of the main members 21a and 22a is made larger than the total length of the radius of the main member 21a and the radius of the main member 22a.

  The pin holes 31a and 32a of the first embodiment are not formed in the lower and upper end portions of the upper and lower tower booms 21 and 22. As shown in FIG. 31A, the connecting pin 153 is inserted into the through holes 37c and 38c in a state where the lower end surface 21c of the upper tower boom 21 and the upper end surface 22c of the lower tower boom 22 are in contact with each other. . As illustrated in FIG. 31B, the upper tower boom 21 is rotated clockwise about the connection pin 153. The upper tower boom 21 is rotated so as to be in a horizontal state as shown in FIG. 31 (c), and is further parallel to the lower tower boom 22 as shown in FIG. 29 (d). It can be rotated, that is, folded up to a substantially vertical position.

  Although not shown, the connection mechanism of the main members 21b and 22b on the rear side of the upper and lower tower booms 21 and 22 in the fourth embodiment is the same as that in the first embodiment.

  According to the folding mechanism 30C of the fourth embodiment, the same function as the folding mechanism 30 of the first embodiment can be achieved. Moreover, since the folding mechanism 30C of the fourth embodiment can reduce the number of members, the cost can be reduced.

  In addition, in the said embodiment, it illustrated as the tower crane 1 with which the tower strut 80 was provided in the upper part of the tower boom 20. FIG. However, the present invention can also be applied to a tower crane in which a front post, a rear post, and the like are provided on the top of the tower boom 20. That is, it can be applied to a tower crane in which a tower jib raising / lowering auxiliary member other than the tower strut 80 is used.

  In the above-described embodiment, the lock mechanism 180 is exemplified as a structure that engages and disengages the hook portion 181 a of the connection link 181 biased by the return spring 184 with the engagement pin 186. However, other structures such as a structure using a hydraulic cylinder as the lock mechanism 180 can be adopted. When a hydraulic cylinder is used, for example, the action of the return spring 184 can be applied to the hydraulic cylinder.

  In the above embodiment, the lock mechanism 180 is exemplified as a structure that engages with the engagement pin 186 by rotating the hook portion 181 a of the connection link 181. However, the engaging pin 186 may be an engaging member having an engaging portion that engages with the hook portion 181a. In this case, the engaging member may be rotatable and the connecting link 181 may be fixed.

  In the said embodiment, the decomposition | disassembly of the tower crane 1 was illustrated as a method of performing in the state which stood the tower boom 20 in the maximum angle. However, it is not necessary to raise the tower boom 20 at the maximum angle, and the tower boom 20 may be raised at a predetermined angle close to the maximum angle. Even in this case, the tower jib 40 is performed in a state of hanging from the upper end of the tower boom 20. Here, drooping refers to a state in which the front end side of the tower jib 40 faces downward so as to face the ground, and a state in which the lower tower jib 42 is held in the upper tower boom 21 and a state in which it is not held. Both are included.

  In the said embodiment, it illustrated as having the structure which regulates the sliding with the outer cylinder 51 and the inner cylinder 52 in the tower backstop 50. FIG. That is, when the support of the tower boom 20 is changed from the support by the whole tower undulation support pendant rope 64 to the support by the lower tower undulation support pendant rope 64b in the process 2 · 1, the inner tube 51 and the inner part of the tower backstop 50 are transferred. The sliding with the cylinder 52 is regulated. The tower boom 20 is held in an inclined state by the tower backstop 50. However, with the tower boom 20 supported by the auxiliary crane, the support of the tower boom 20 may be changed from the support by the entire tower undulation support pendant rope 64 to the support by the lower tower undulation support pendant rope 64b. It is. With this method, it is not necessary to provide the tower backstop 50 with a structure that restricts sliding between the outer cylinder 51 and the inner cylinder 52.

  In the above embodiment, the main members 21 b and 22 b on the rear side of the upper and lower tower booms 21 and 22 are exemplified as a structure connected by the rear pin 152. However, instead of the rear pin 152, a fastening member such as a bolt may be used.

  Although various embodiments have been described above, the present invention is not limited to these contents. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

1 Tower crane 2 Lower traveling body (traveling body)
3 Upper swing body (revolving body)
20 Tower boom 21 Upper tower boom (upper boom)
22 Lower tower boom (lower boom)
30, 30A-C Folding mechanism 40 Tower jib 80 Tower strut (Tower jib hoisting support member)
180 Locking mechanism (Tower jib auxiliary member connecting mechanism)
181 Connection link (connection member)
181a Hook part (locking part)
186 Engagement pin (engagement part)
191 release handle

Claims (5)

A traveling body,
A swivel body provided on the travel body so as to be turnable;
A tower boom attached to the swivel body in a undulating manner;
A tower jib attached to the upper end of the tower boom so as to be raised and lowered;
A tower jib raising / lowering auxiliary member for raising and lowering the tower jib, which is rotatably provided at an upper end of the tower boom;
A tower crane comprising: a tower jib auxiliary member connecting mechanism that releasably connects the tower jib hoisting auxiliary member to the tower boom. The tower crane according to claim 1,
The tower jib auxiliary member connecting mechanism is
A connecting member having a locking portion provided rotatably on the tower boom;
A tower crane provided with the above-mentioned tower jib raising and lowering auxiliary member, and an engaging part engaged with the above-mentioned locking part of the above-mentioned connecting member. In the tower crane of Claim 1 or 2,
The tower boom is
An upper boom,
A lower boom,
A boom coupling mechanism that couples the upper boom and the lower boom;
The tower jib auxiliary member connecting mechanism is a tower crane provided on the upper boom. The tower crane according to claim 3,
The said boom connection mechanism is a tower crane which connects the said upper boom with respect to the said lower boom so that tilting is possible. In the tower crane of any one of Claims 1 thru | or 4,
The tower jib auxiliary member connecting mechanism further includes a release handle capable of operating release and connection of the tower jib raising / lowering auxiliary member in a state where the tower boom stands up at a predetermined angle and embraces the tower jib.

Images