Mast stay device of a mobile crane

Abstract

To provide a mast stay device of a climbing crane capable of avoiding high place work during assembly or disassembly and improving the degree of freedom in height adjustment of a stay.SOLUTION: A mast stay device includes a stay frame 800 detachably provided on an elevation unit 400 freely raised and lowered along a mast 300 and fixed to the mast 300. A stay 700 for reinforcing the mast 300 is bridged between the stay frame 800 and a foundation frame 200.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a mast stay device of a climbing crane.

Background Art

[0002] Generally, for the construction of structures such as high-rise buildings, a climbing crane 100 as shown in FIG. 5 is used.

[0003] The climbing crane 100 includes a base pedestal 200, a mast 300, a lifting unit 400, and a slewing body 500.

[0004] The base pedestal 200 is a pedestal having a cross-shaped planar shape that is placed and fixed on the base surface B.

[0005] The mast 300 is erected by sequentially stacking mast blocks 310 on the base pedestal 200.

[0006] The lifting unit 400 includes a guide mast 410 and a lifting frame 420, and is movable up and down along the mast 300.

[0007] The slewing body 500 is rotatably disposed at the upper end of the lifting unit 400, and a jib 600 is provided so as to be able to be raised and lowered.

[0008] In the climbing crane 100, when a large number of mast blocks 310 are stacked and the height of the mast 300 increases, a stay 700 is attached between the base pedestal 200 and the mast 300 to reinforce the mast 300 and suppress its deflection.

[0009] The upper end of the stay 700 is connected to a stay bracket 320 protruding from the side surface of the mast block 310 by a connecting pin 710, and the lower end of the stay 700 is connected to a base bracket 210 protruding from the upper surface of the base pedestal 200 by a connecting pin 710.

[0010] As an example showing the general technical level related to the climbing crane 100, there is Patent Document 1, for instance.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0012] However, as described above, when the stay bracket 320 protrudes from the side surface of the mast block 310, when assembling the climbing crane 100, as shown in FIG. 6, when the lifting unit 400 and the slewing body 500 are assembled to the lowermost mast block 310, the lifting unit 400 interferes with the stay bracket 320 and cannot rise.

[0013] For this reason, the lifting unit 400 and the slewing body 500 have to be assembled at a position above the mast block 310 where the stay bracket 320 protrudes, and high-altitude work has to be carried out. Similarly, high-altitude work is also essential when disassembling the climbing crane 100, so improvement has been desired.

[0014] Moreover, the work of connecting the upper end of the stay 700 to the stay bracket 320 protruding from the side surface of the mast block 310 also had to be carried out at a high altitude.

[0015] In addition, the position where the stay bracket 320 protrudes from the side surface of the mast block 310 is fixed, and the inability to adjust the height of the stay 700 has also been cited as one of the points to be improved.

[0016] The present invention has been made in view of the above-described conventional problems, and aims to provide a mast stay device for a climbing crane that can avoid high-altitude work during assembly and disassembly and increase the degree of freedom in adjusting the height of the stay.

Means for Solving the Problems

[0017] In a mast stay device for a climbing crane, which includes a foundation base installed on a base surface, a mast erected by sequentially stacking mast blocks on the foundation base, a lifting unit that can move up and down along the mast, a swivel body rotatably disposed at the upper end of the lifting unit and provided with a boom that can be raised and lowered, and a stay for reinforcing the mast, the lifting unit is detachably suspended and supported and is separated from the lifting unit at the height position where the upper end of the stay in the mast should be fixed and is fixed to the mast is provided with a stay frame, and the stay is related to a mast stay device for a climbing crane that is spanned between the stay frame and the foundation base.

[0018] In the mast stay device for a climbing crane, the stay frame can be suspended by driving a suspension pin between a suspension bracket attached to the stay frame and a lifting bracket attached to the lifting unit.

[0019] Also, the stay frame can be fixed to the mast by driving a lock pin into a cannula hole drilled in the mast block.

[0020] Furthermore, the number of connections of the stay can be selected according to the height of the mast.

Effects of the Invention

[0021] According to the mast stay device for a climbing crane of the present invention, it is possible to achieve excellent effects such as avoiding high-altitude work during assembly and disassembly and increasing the degree of freedom in adjusting the height of the stay.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0023] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0024] Figures 1 to 4 are embodiments of the mast stay device of the climbing crane of the present invention. In the figures, parts denoted by the same reference numerals as in Figures 5 and 6 represent the same objects.

[0025] In this embodiment, a stay frame 800 is provided, and it is characterized in that a stay 700 is spanned between the stay frame 800 and the foundation base 200.

[0026] The stay frame 800 is detachably attached to the lifting unit 400. Suspended and supported, and can be separated at an appropriate height position on the mast 300 As an example of the connection method of the stay frame 800 to the lifting unit 400, a suspension pin 820 can be driven between a suspension bracket 810 attached to the stay frame 800 and a lifting bracket 430 attached to the lifting unit 400 so that the stay frame 800 can be suspended from the lifting unit 400.

[0027] Further, as shown in FIG. 2, the stay frame 800 is fixed to the mast 300 by driving a locking pin 830 into a keyhole 330 formed in the mast block 310. The locking pin 830 is slidably inserted into a storage hole 840 of the stay frame 800 in the radial direction of the mast 300, and a cylinder 860 is connected to a proximal end projection 831 of the locking pin 830 via a swing link 850. The swing link 850 and the cylinder 860 are pivotally supported by a frame 870 that projects outward from the stay frame 800, respectively.

[0028] In addition, as shown in FIG. 2, guides 340 (for example, angles) are fixed to the mast block 310 at four circumferential positions at the height position of the mast 300 where the stay frame 800 should be fixed. A fixing bracket 890 is screwed into the guide 340 through a through hole 880 of the stay frame 800 to prevent the stay frame 800 from falling off the mast 300.

[0029] Furthermore, a stay bracket 320 is attached to the outer peripheral portion of the stay frame 800, and an upper end bracket 720 of a stay 700 described later is connected to the stay bracket 320 by a connecting pin 710.

[0030] On the other hand, upper end brackets 720 and lower end brackets 730 for connection are provided at the upper and lower ends of the stay 700, and the mounting angles of the upper end bracket 720 and the lower end bracket 730 in a plane orthogonal to the axis of the stay 700 are shifted by a phase of about 90° as shown in FIG. 3. The upper end bracket 720 of the stay 700 located below is connected to the lower end bracket 730 of the stay 700 located above by a connecting pin 710, which can also make it difficult to generate sway when the stay 700 is mounted.

[0031] Further, the number of stay cables 700 to be connected is selected according to the height of the mast 300. Incidentally, in the case of this embodiment, as shown in FIG. 4, the number of stay cables connected to the mast 300 is four, but needless to say, it is not limited to four, and may be one or a plurality of cables other than four. The lower end bracket 730 of the stay cable 700 located at the lowermost end of the plurality of connected stay cables is connected to the foundation bracket 210 protruding from the upper surface of the foundation pedestal 200 by a connecting pin 710 as shown in FIG. 4(f).

[0032] Next, the operation of the above embodiment will be described.

[0033] When assembling the climbing crane 100, first, as shown in FIG. 4(a), the foundation pedestal 200 is installed on the base surface B, and the mast block 310 is erected on the foundation pedestal 200.

[0034] Subsequently, as shown in FIG. 4(b), the lifting unit 400 and the stay frame 800 are set on the mast block 310. The stay frame 800 is suspended by driving a suspension pin 820 into a lifting bracket 430 attached to the lifting unit 400.

[0035] After that, as shown in FIG. 4(c), the slewing unit 500 is attached to the lifting unit 400, and as shown in FIG. 4(d), the jib 600 is attached to the slewing unit 500.

[0036] After attaching the jib 600, as shown in FIG. 4(e), a plurality of mast blocks 310 are stacked.

[0037] When a plurality of mast blocks 310 are stacked, the lifting unit 400 starts to rise along the mast block 310 together with the stay frame 800.

[0038] When the lifting unit 400 and the stay frame 800 rise to the required height of the first stage, the upper end bracket 720 of the first-stage stay 700 is connected to the stay bracket 320 of the stay frame 800 by a connecting pin 710, and the first-stage stay 700 is suspended from the stay frame 800.

[0039] After the first-stage stay 700 is suspended from the stay frame 800, the lifting unit 400 and the stay frame 800 rise along the mast block 310, the mast block 310 is added upward, and the lifting unit 400 and the stay frame 800 further rise along the added mast block 310.

[0040] When the lifting unit 400 and the stay frame 800 rise to the required height of the second stage, the upper end bracket 720 of the second-stage stay 700 is connected to the lower end bracket 730 of the first-stage stay 700 by a connecting pin 710, and the first-stage and second-stage stays 700 are suspended from the stay frame 800.

[0041] Hereinafter, the same operation as described above is repeated. In the example of FIG. 4, when the lifting unit 400 and the stay frame 800 rise to the required height of the fourth stage and this position is the height at which the upper end of the stay 700 should be fixed, as shown in FIG. 2, the cylinder 860 extends and the lock pin 830 is driven into the cannula hole 330 via the swing link 850. Further, a fixing bracket 890 is screwed into the guide 340 fixed to the mast block 310 at the height position of the mast 300 where the stay frame 800 should be fixed from the through hole 880 of the stay frame 800, and the stay frame 800 is fixed to the mast block 310.

[0042] At the same time, the upper end bracket 720 of the fourth-stage stay 700 is connected to the lower end bracket 730 of the third-stage stay 700 by a connecting pin 710, and the lower end bracket 730 of the fourth-stage stay 700 is connected to the foundation bracket 210 by a connecting pin 710 as shown in FIG. 4(f). Thereby, the installation of the stay 700 is completed.

[0043] When the installation of the stay 700 is completed, the stay frame 800 is detached from the lifting unit 400, the mast block 310 is added upward, and only the lifting unit 400 further rises along the added mast block 310. As shown in Fig. 4(g), the mast 300 is reinforced by the stay 700 and its deflection is suppressed, and the work by the climbing crane 100 is performed in this state.

[0044] When the work by the climbing crane 100 is completed, the disassembling work of the climbing crane 100 is performed in the reverse procedure to the above.

[0045] In this embodiment, unlike the conventional case, since the stay bracket 320 is not protruded from the side surface of the mast block 310, when assembling the climbing crane 100, even if the lifting unit 400 and the slewing body 500 are assembled to the lowermost mast block 310, the lifting unit 400 can rise without interfering with the stay bracket 320.

[0046] Therefore, not only when assembling the climbing crane 100 but also when disassembling it, it is not necessary to perform work at high places.

[0047] Moreover, the upper end of the stay 700 is pulled up in a state of being previously connected to the stay frame 800 at a low place, and it is possible to sequentially add the stay 700 to the lower end of the stay 700 at a low place.

[0048] Also, the cannula holes 330 are drilled at a required pitch in the longitudinal direction of the mast block 310, and since the fixed position of the stay frame 800 is variable, it is also possible to adjust the height of the stay 700.

[0049] In this way, it is possible to avoid work at high places during assembly and disassembly and increase the degree of freedom in adjusting the height of the stay 700.

[0050] And in the case of this embodiment, the stay frame 800 is suspended by driving a suspension pin 820 between a suspension bracket 810 attached to the stay frame 800 and a lifting bracket 430 attached to the lifting unit 400. With this configuration, it is possible to easily install or remove the stay frame 800 at the required height position of the mast 300 in conjunction with the lifting of the lifting unit 400.

[0051] Also, the stay frame 800 is fixed to the mast 300 by driving a locking pin 830 into a slotted hole 330 formed in the mast block 310. With this configuration, there is no need to newly provide a receiver or the like for fixing the stay frame 800 to the mast block 310, and the slotted hole 330 formed in the mast block 310 for lifting the lifting unit 400 can be effectively utilized.

[0052] Furthermore, the number of stays 700 is selected according to the height of the mast 300. With this configuration, it is possible to reinforce the mast 300 appropriately according to the scale of the structure constructed by the climbing crane 100.

[0053] Note that the mast stay device of the climbing crane of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

Explanation of Reference Numerals

[0054] 100 Climbing Crane 200 Foundation Stand 210 Foundation Bracket 300 Mast 310 Mast Block 320 Stay Bracket 330 Slotted Hole 340 Guide 400 Lifting Unit 410 Guide Mast 420 Lifting frame 430 Lifting bracket 500 Swivel body 600 Jib 700 Stay 710 Connecting pin 720 Upper bracket 730 Lower bracket 800 Stay frame 810 Suspension bracket 820 Suspension pin 830 Locking pin 831 Base end projection 840 Storage hole 850 Rocking link 860 Cylinder 870 Frame 880 Through hole 890 Fixed fitting B Base surface

Claims

1. In a mast stay device for a climbing crane, comprising a foundation base installed on a base surface, a mast erected by sequentially stacking mast blocks on the foundation base, a lifting unit that is movable up and down along the mast, a swivel body that is rotatably disposed at the upper end of the lifting unit and is provided with a jib that can be raised and lowered, and a stay for reinforcing the mast, the lifting unit is detachably suspended and supported, and a stay frame is provided that is separated from the lifting unit at a height position where the upper end of the stay on the mast should be fixed and is fixed to the mast. The stay is a mast stay device for a climbing crane that is spanned between the stay frame and the foundation base.

2. The mast stay device for a climbing crane according to claim 1, wherein the stay frame is suspended by driving a suspension pin between a suspension bracket attached to the stay frame and a lifting bracket attached to the lifting unit.

3. The mast stay device for a climbing crane according to claim 1 or 2, wherein the stay frame is fixed to the mast by driving a locking pin into a cannula hole drilled in the mast block.

4. The mast stay device for a climbing crane according to any one of claims 1 to 3, wherein the number of connected stays is selected according to the height of the mast.

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