Tower crane mast support structure

Abstract

To provide a support structure for a tower crane mast with good workability, which can stably support the mast.SOLUTION: A support structure 2 for a tower crane mast comprises a diagonal member 26 which is disposed to incline in a direction away from a mast 21 from the lateral side of the mast 21 downward, and supports the mast 21. The upper part 26u of the diagonal member 26 is detachably connected to the mast 21. An attachment hole 212 is formed on the outer surface 211 of the mast 21 to penetrate the mast 21 from the inside to the outside. An attachment part 262 is provided on the upper part 26u of the diagonal member 26 to be inserted into the attachment hole 212. A pin hole 263 is formed at the end of the attachment part 262 to vertically penetrate it. A pull stop pin 264 is locked in the pin hole 263.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a support structure for a mast of a tower crane. [Background technology]

[0002] Conventionally, when constructing structures such as wind turbines used in wind power generation, mobile cranes such as all-terrain cranes have been used. Construction using multi-stage telescopic tower cranes has also been proposed (see Patent Document 1 below). In addition, there are also tower cranes that support both sides of the mast with diagonal members to prevent the mast from tipping over. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4402923 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, wind turbines used in wind power generation have become taller and larger to increase power generation efficiency, and there are cases where they cannot be lifted by current mobile cranes such as all-terrain cranes. For this reason, it is considered to use a high-freestanding tower crane that is large enough to lift. Since multiple wind turbines are installed at a power plant, it is necessary to assemble a tower crane when constructing one wind turbine, dismantle the tower crane after the construction of the wind turbine is completed, transport the dismantled tower crane to the construction site of the next wind turbine, and reassemble the tower crane. However, the dismantling and assembly work of the tower crane takes time, and the construction period is extended. In addition, since it is a high-freestanding type, consideration must be given to deflection and mast strength, and attaching a diagonal member to the middle part of the mast is an effective solution. In order to satisfy these conditions, it is desired to attach and remove the diagonal member to the mast in a short time.

[0005] In the past, a structure in which a pin bracket was attached to the mast for attaching diagonal members had been adopted, but this required access from the outside and work at a high altitude when attaching and removing the diagonal members, which could pose safety issues.

[0006] Therefore, the present invention has been made in consideration of the above circumstances, and provides a support structure for a mast of a tower crane that is easy to construct and can stably support the mast. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention employs the following means. That is, the support structure of the mast of the tower crane according to the present invention includes a diagonal member that is arranged at an angle gradually moving away from the mast as it goes downward from the side of the mast and supports the mast, and the upper part of the diagonal member is detachably connected to the mast. The mast has an outer surface formed with a mounting hole penetrating inward and outward of the mast, and the diagonal member has an upper portion with a mounting part inserted into the mounting hole. The end of the mounting part has a pin hole penetrating in the vertical direction, and a stop pin is engaged in the pin hole. do.

[0008] In the tower crane mast support structure constructed in this way, the mast is supported stably because the diagonal members are supported from the sides. In addition, the upper part of the diagonal member is detachably connected to the mast, so the diagonal members can be easily attached and detached, and construction is easy. When attaching the diagonal member to the mast, the attachment part of the diagonal member is inserted into an attachment hole provided in the mast. The upper part of the diagonal member can be kept attached to the mast by engaging a locking pin in a pin hole formed in the end of the attachment part. When removing the diagonal member from the mast, the locking pin is removed from the pin hole and the attachment part of the diagonal member is removed from the attachment hole provided in the mast. Thus, the upper part of the diagonal member can be easily attached and removed, and since this work is carried out inside the mast, it is also advantageous in terms of safety.

[0011] In addition, in the support structure for the mast of a tower crane according to the present invention, a head of the anti-slip pin may be engaged in the pin hole.

[0012] In addition, the support structure of the mast of the tower crane according to the present invention is Up and down The length is the same as that of the mounting hole. Up and down It may be longer than the length.

[0013] In the tower crane mast support structure configured in this way, the length of the anti-slip pin is longer than the length of the mounting hole, so the anti-slip pin will not get stuck in the mounting hole and the diagonal member can be maintained attached to the mast. Effect of the Invention

[0014] According to the support structure for a mast of a tower crane according to the present invention, construction is easy and the mast can be supported stably. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a diagram showing a state during construction work in a tower crane according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing a state before the diagonal members are attached in a tower crane according to one embodiment of the present invention. [Diagram 3] 1A to 1C are diagrams showing a state during assembly and disassembly of a tower crane according to an embodiment of the present invention. [Figure 4] FIG. 2 is a diagram showing the configuration of the lower part of a tower crane according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a diagram showing a support structure of a tower crane according to an embodiment of the present invention. [Figure 6] 1 is a diagram illustrating a method for transporting a tower crane according to one embodiment of the present invention. FIG. [Figure 7] FIG. 7 is a diagram for explaining a method for transporting a tower crane according to an embodiment of the present invention, showing a process subsequent to that shown in FIG. 6 after construction work. [Figure 8] FIG. 8 is a diagram for explaining a method for transporting a tower crane according to one embodiment of the present invention, showing a process subsequent to that shown in FIG. 7 after construction work. [Figure 9] FIG. 1 is a diagram for explaining a method for transporting a tower crane according to one embodiment of the present invention, showing a post-construction process after construction work. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] A support structure for a mast of a tower crane according to one embodiment of the present invention will be described with reference to the drawings. First, a tower crane during construction work will be described.

[0017] As shown in Fig. 1, a tower crane 100 is used, for example, when constructing a wind turbine W. In Fig. 1, the blades of the wind turbine W are not shown. Note that the object to be constructed using the tower crane 100 is not limited to the wind turbine W, and may be a high-rise structure or the like.

[0018] The tower crane 100 can be changed into a configuration during construction work as shown in Figure 1 (referred to as tower crane 100A), a configuration before the diagonal members are attached as shown in Figure 2 (referred to as tower crane 100C before the diagonal members are attached), and a configuration in the middle of assembly and disassembly as shown in Figure 3 (referred to as tower crane 100B).

[0019] The tower crane 100A during construction work includes a base 1, a mast 21, a rotating body 22, and a diagonal member 26.

[0020] The base 1 has a base 11, a stand 12, and legs 13. As shown in Fig. 6, the base 11 is disposed below the tip portion 13a of each leg 13. In this embodiment, there are four legs 13, and the bases 11 are disposed at four locations. The base 11 is placed on a work surface G such as the ground.

[0021] The platform 12 is disposed directly below the mast 21. In this embodiment, the platform 12 is formed in a cross shape in a plan view. The platform 12 has a central portion 12a and four extending portions 12b extending in four directions from the central portion 12a. The corners of the extending portions 12b that intersect at right angles are called right-angle portions 12c. A lower surface 12d of the platform 12 is spaced upward from the work surface G.

[0022] The legs 13 are connected to the tip of each extension portion 12b of the stand 12. The extension direction of the legs 13 is substantially the same as the extension direction of the extension portion 12b. In other words, in a plan view, the extension portion 12b and the legs 13 extend in a straight line from the central portion 12a. The legs 13 are made of steel such as H-beams. The lower surface 13d of the legs 13 is spaced upward from the work surface G and is located at a higher position than the lower surface 12d of the stand 12.

[0023] The connection structure between the stand 12 and the legs 13, and the connection structure between the legs 13 and the base 11 will be described with reference to Fig. 4. Note that the connection structure shown in Fig. 4 is an example, and other structures may be used.

[0024] As shown in Fig. 4, the lower part of the leg 13 has a leg support part 13b extending towards the pedestal 12. The upper part of the pedestal 12 has a pedestal connector 12e extending towards the leg 13. The pedestal connector 12e is installed above the leg support part 13b via an intermediate material 14. The pedestal connector 12e may be installed directly on the leg support part 13b. Instead of the intermediate material 14, the leg 13 and the pedestal 12 may be joined together by a pin (not shown) facing in the horizontal direction.

[0025] The tip of the extension 12b has a first connecting plate 121. The first connecting plate 121 is formed in a plate shape. The plate surface of the first connecting plate 121 faces the horizontal direction. The leg 13 has a second connecting plate 131 facing the first connecting plate 121. The second connecting plate 131 is formed in a plate shape. The plate surface of the second connecting plate 131 faces the same direction as the first connecting plate 121. A bolt 132 is inserted into a mounting hole formed in the first connecting plate 121 and the second connecting plate 131, and is fastened to a nut 133. In this way, the frame 12 and the leg 13 are connected. An opening for mounting the bolt 132 and the nut 133 may be formed on the upper surface of the frame 12 and the leg 13.

[0026] The tip 13a of the leg 13 has an upper plate 136 located on the upper surface and a lower plate 137 located on the lower surface. The upper plate 136 and the lower plate 137 are arranged spaced apart in the vertical direction. The upper plate 136 and the lower plate 137 are formed in a plate shape. The plate surfaces of the upper plate 136 and the lower plate 137 face the vertical direction. Bolts 138 are inserted into mounting holes formed in the upper plate 136 and the lower plate 137, and the upper plate 136 and the lower plate 137 are fastened to the base 11. In this way, the leg 13 is connected to the base 11.

[0027] 1, the mast 21 has a plurality of mast members 21a connected separably in the vertical direction. For example, the mast members 21a are made of steel, and vertically adjacent mast members 21a are configured to be connected and separable by connecting means such as bolts and nuts.

[0028] Of the mast members 21a, the one located at the bottom is referred to as a bottom mast member (lower part of the mast) 21b. A lower end of the bottom mast member 21b is connected to the frame 12.

[0029] The rotating body 22 has a rotating base 23, a jib 24, and a lifting device 25. The rotating base 23 is supported by the uppermost mast member 21c located at the uppermost part of the mast members 21a. The rotating base 23 is supported by the uppermost mast member 21c so as to be rotatable around an axis with the vertical direction as the axis direction. An operator seated on the rotating base 23 operates the tower crane 100. Note that there may be no operator on the rotating base 23, and the tower crane 100 may be operated by remote control. The jib 24 is attached to the rotating base 23. The base end of the jib 24 is pivotally supported on the rotating base 23 so as to be able to swing. The lifting device 25 has a winch 25a, a wire 25b, and a hook 25c. The winch 25a is provided on the rotating base 23. The wire 25b can be wound up and down by the winch 25a, and is engaged with the tip of the jib 24. The hook 25c is provided at the tip of the wire 25b, and is capable of suspending a component of the wind turbine W.

[0030] The support structure 2 of the mast of the tower crane will be described. The diagonal members 26 are provided in four directions of the mast 21. In a plan view, the diagonal members 26 are arranged so as to extend in four directions from the mast 21. The diagonal members 26 are arranged at an incline with respect to the vertical direction. The diagonal members 26 are gradually inclined in a direction away from the mast 21 as they extend downward. The diagonal members 26 support the mast 21 from four directions. The lower end portion 26b of the diagonal members 26 is detachably connected to the tip portion 13a of the leg 13 by connecting means such as bolts and nuts. The diagonal members 26 may be provided at one or more locations on the side of the mast 21, and may be provided on both sides of the mast 21.

[0031] Among the mast members 21a, the one disposed one above the bottom mast member 21b is referred to as the second mast member 21d. The upper end 26u of the diagonal member 26 is detachably connected to the second mast member 21d. The upper end 26u of the diagonal member 26 may be connected to a mast member 21a above the second mast member 21d.

[0032] 5 (partially shown in cross section), an outer plate portion 211 forming the outer surface of the second stage mast member 21d is formed with a through hole (mounting hole) 212 penetrating in the inward / outward direction of the mast 21 (the direction connecting the center and the outside of the mast 21 in a plan view). Ribs 213a, 213b extending inward of the mast 21 are provided along the upper and lower edges of the through hole 212. The ribs 213a, 213b may be cylindrical bosses.

[0033] A support plate 261 is provided at the upper end 26u of the diagonal member 26. The support plate 261 is disposed along the outer surface of the outer plate portion 211 of the second stage mast member 21d.

[0034] The support plate 261 is provided with an insertion portion (mounting portion) 262. The insertion portion 262 is inserted into the through-hole 212 of the second stage mast member 21d.

[0035] A pin hole 263 that penetrates in the vertical direction is formed at the end of the insertion portion 262. A stop pin 264 that extends in the vertical direction is inserted into the pin hole 263.

[0036] The head 265 of the retaining pin 264 has a diameter larger than the diameter of the pin hole 263. As a result, the head 265 of the pin 264 is engaged with the pin hole 263.

[0037] The vertical length of the retaining pin 264 is longer than the vertical length of the through hole 212. A head 265 of the retaining pin 264 is disposed at a position where it interferes with the upper rib 213a of the through hole 212. A lower end 266 of the retaining pin 264 is disposed at a position where it interferes with the lower rib 213b of the through hole 212. This prevents the insertion portion 262 from slipping out of the through hole 212 to the outside.

[0038] The insertion portion 262 of the diagonal member 26 is supported by the lower rib 213b of the second mast member 21d, and the movement of the insertion portion 262 of the diagonal member 26 is restricted by the anti-slip pin 264 inserted into the pin hole 263, so that the upper end portion 26u of the diagonal member 26 is detachably connected to the second mast member 21d.

[0039] During assembly and disassembly, the tower crane 100A described above needs to be changed to a tower crane 100B as shown in FIG. 3, and the diagonal members 26 need to be removed as shown in FIG. 2. As shown in FIG. 3, during assembly and disassembly, the tower crane 100B is mounted on a transport vehicle 3. The tower crane 100B mounted on the transport vehicle 3 is called a tower crane transport unit 10. The tower crane transport unit 10 includes the transport vehicle 3, a positioning unit (see FIG. 6) 4, and a tower crane 100B. The tower crane 100B includes a base 12, a bottom mast member 21b, and a rotating body 22.

[0040] Any suitable vehicle capable of moving and capable of placing heavy objects thereon can be used as the transport vehicle 3. In this embodiment, a multi-axle dolly vehicle capable of being lifted up is used as the transport vehicle 3.

[0041] As shown in FIG. 6 (the rotating body 22 is not shown), the transporter 3 has a plurality of drivable wheels 30, a loading platform 31, and a lift unit 32. The loading platform 31 is formed in a flat plate shape, and a heavy object can be placed on the upper surface. The loading platform 31 is connected to the wheels 30 via the lift unit 32. The lift unit 32 can raise and lower the loading platform 31 up and down.

[0042] An installation plate 34 is fixed to the loading platform 31. The installation plate 34 has an upper plate portion 34a disposed on the upper surface of the loading platform 31, and a side plate portion 34b disposed on a side of the loading platform 31. The side plate portion 34b is connected to the loading platform 31 by a connecting means 34c of bolts and nuts.

[0043] The positioning parts 4 are fixed to the upper surface 34u of the installation plate 34. In this embodiment, the four positioning parts 4 are arranged at positions corresponding to the right angle parts 12c of the platform 12 of the tower crane 100B to be transported. The positioning parts 4 are fixed to the upper surface 34u of the installation plate 34 by connecting means such as welding or bolts and nuts.

[0044] The positioning portion 4 is formed in an L-shape in a plan view. The positioning portion 4 has a first straight portion 41 and a second straight portion 42. The first straight portion 41 and the second straight portion 42 are formed to be linear in a plan view. The first straight portion 41 and the second straight portion 42 are disposed perpendicular to each other in a plan view. As shown in FIG. 9, an intersection 43 between the first straight portion 41 and the second straight portion 42 is disposed at a right angle portion 12c of the frame 12. The tower crane 100 itself can stand on its own weight, and the frame 12 is positioned on the installation plate 34 by the positioning portion 4.

[0045] As shown in Fig. 3, in the transport unit 10 of the tower crane, the base 11 and legs 13 of the base 1 have been removed, and only the platform 12 has been installed. Of the multiple mast members 21a, all mast members 21a other than the bottom mast member 21b have been removed. The rotating body 22 is supported by the bottom mast member 21b.

[0046] Next, a method for transporting a tower crane will be described. When the tower crane 100 is moved to the construction site of the next wind turbine W after the construction of one wind turbine W is completed, a mast dismantling process is carried out first. In the tower crane 100A in the configuration upon completion of the construction work, the bottom mast member 21b of the mast 21 is left and the other mast members 21a are dismantled. The rotating body 22 is lowered to the lower mast member 21a, and the upper mast member 21a is removed in sequence, and the rotating body 22 is lowered to the bottom mast member 21b.

[0047] At that time, the diagonal member 26 is removed before it interferes with the descent of the rotating body 22. The retaining pin 264 is moved upward and removed from the pin hole 263 of the insertion part 262 of the diagonal member 26. The insertion part 262 of the diagonal member 26 is removed from the through hole 212 of the mast 21. This makes it possible to remove the diagonal member 26 from the mast 21.

[0048] Next, the transport vehicle insertion process is carried out. 6, with the installation plate 34 fixed to the transporter 3, the transporter 3 is inserted below the base 1. In this state, a gap is generated between the upper surface 34u of the installation plate 34 and the lower surface 12d of the base 12.

[0049] Next, a positioning step is performed. The bolts 138 (see FIG. 4) connecting the legs 13 and the base 11 are removed. As shown in FIG. 7, the lift unit 32 of the transport vehicle 3 is driven to raise the loading platform 31. The upper surface 34u of the installation plate 34 fixed to the loading platform 31 abuts against the lower surface 12d of the stand 12, and the loading platform 31 is raised to a height at which the legs 13 are lifted off the base 11.

[0050] Fillers 15b are placed between the legs 13 and the base 11. Because the lower surfaces 13d of the legs 13 are positioned higher than the lower surface 12d of the stand 12, fillers 15a are also placed between the lower surfaces 13d of the legs 13 and the upper surface 34u of the installation plate 34 fixed to the loading platform 31 to adjust the height. In this manner, the base 1 is supported by the loading platform 31.

[0051] At this time, the intersection 43 of the positioning portion 4 provided on the installation plate is placed at the right angle portion 12c of the base 12, and the base 12 is positioned on the installation plate .

[0052] Next, the leg removal process is carried out. The bolts 132 and nuts 133 connecting the base 12 and the legs 13 are removed. As shown in Fig. 8, the legs 13 are lifted and removed by another lifting machine such as a crane. All four legs 13 are removed. Thereafter, the base 11 is also removed as necessary.

[0053] Next, the moving step is carried out. 9, the lift section 32 of the transporter 3 is driven to lower the loading platform section 31. The transport unit 10 of the tower crane is moved to the next construction site.

[0054] At the next construction site, the tower crane transport unit 10 is reassembled into the original tower crane 100A. The leg attachment process is carried out. The lift section 32 of the transport vehicle 3 is driven to raise the loading platform section 31 to a predetermined height. As shown in Fig. 8, the base 11 and the filler 15b are placed below the tip end 13a of the leg 13 to be installed, and the filler 15a is also placed on the installation plate 34. The base 12 and the legs 13 are fastened with bolts 132 and nuts 133 to attach the four legs 13 to the base 12.

[0055] Next, the transport vehicle moving process is carried out. The lift section 32 of the transport vehicle 3 is driven to lower the loading platform 31. The legs 13 and base 11 are fastened with bolts 138. The transport vehicle 3 is moved from below the platform 12. Thereafter, the other mast members 21a are sequentially connected to the upper side of the bottom mast member 21b, the rotating body 22 is raised to a specified position, and the diagonal members 26 are attached, completing the tower crane 100A for construction work.

[0056] When attaching the diagonal member 26 to the mast 21, the insertion portion 262 of the diagonal member 26 is inserted into the through hole 212 of the mast 21. The retaining pin 264 is inserted into the pin hole 263 of the insertion portion 262, and the head 265 of the retaining pin 264 is engaged with the pin hole 263. This allows the diagonal member 26 to be attached to the mast 21.

[0057] According to this embodiment, the mast 21 is stably supported since it is supported from both sides by the diagonal members 26. In addition, the upper end 26u of the diagonal member 26 is detachably connected to the mast 21, so that the diagonal member 26 can be easily attached and detached, and the workability is good.

[0058] When attaching the diagonal member 26 to the mast 21, the insertion portion 262 of the diagonal member 26 is inserted into the through hole 212 of the mast 21. If the retaining pin 264 is engaged with the pin hole 263 formed at the end of the insertion portion 262, the upper portion of the diagonal member 26 can be maintained attached to the mast 21. When removing the diagonal member 26 from the mast 21, the retaining pin 264 is removed from the pin hole 263, and the insertion portion 262 of the diagonal member 26 is removed from the through hole 212 of the mast 21. Thus, the upper end 26u of the diagonal member 26 can be easily attached and removed.

[0059] Furthermore, by engaging the head 265 of the anti-slip pin 264 with the pin hole 263, the upper end 26u of the diagonal member 26 can be maintained attached to the mast 21, making it easy to attach the diagonal member 26 to the mast 21.

[0060] In addition, the length of the retaining pin 264 is longer than the length of the through hole 212. Therefore, the retaining pin 264 will not enter the through hole 212, and the diagonal member 26 can be maintained attached to the mast 21.

[0061] Furthermore, the mast members 21a other than the bottom mast member 21b of the mast 21 are dismantled (removed) from the tower crane 100A during construction work, and the rotating body 22 is lowered to the bottom mast member 21b. The platform 12 is installed on the installation plate 34 fixed to the loading platform 31 of the transport vehicle 3, and the platform 12 is positioned on the installation plate 34 by the positioning unit 4 provided on the installation plate 34. This results in the tower crane transport unit 10 having the tower crane 100B in a form for moving. The tower crane transport unit 10 is moved to the next construction site, the platform 12 is lowered from the transport vehicle 3, the dismantled mast member 21a is connected to the bottom mast member 21b, and the rotating body 22 is raised, completing the tower crane 100A during construction work. Therefore, since the tower crane 100 only requires dismantling the mast member 21a other than the bottom mast member 21b of the mast 21, the time required for dismantling and assembling the tower crane 100 is reduced, and the construction period can be shortened.

[0062] In addition, the positioning portion 4 is arranged at a right angle portion 12c of the base 12 which has a cross shape when viewed in a plane, and the two surfaces forming the right angle portion 12c of the base 12 abut against the positioning portion 4, thereby restricting movement of the base 12 in two directions.

[0063] In addition, since the first straight portion 41 and the second straight portion 42, which are linear when viewed in a plane, abut against two surfaces that form the right-angle portion 12c of the mount 12, the contact area between the positioning portion 4 and the mount 12 is increased, and misalignment of the mount 12 is further suppressed.

[0064] The shapes and combinations of the components shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0065] For example, in addition to the embodiment described above, the upper portion of the diagonal member 26 may be detachably connected to the mast 21 by a connecting means such as bolts and nuts. [Explanation of symbols]

[0066] 1 Base 2. Tower crane mast support structure 3. Transport vehicle 4 Positioning part 10 Tower crane transport unit 12 Mounting stand 12c Right angle part 13 legs 21 Mast 21b Bottom mast member (lower part of the mast) 22 Rotating body 25 Lifting equipment 26 Diagonal 31 Cargo area 41 First straight section 42 Second straight section 100 Tower Crane 100A Tower crane during construction work 100B Tower crane during movement 100C Tower crane before diagonal beams are attached

Claims

1. a diagonal member for supporting the mast, the diagonal member being disposed so as to be gradually inclined in a direction away from the mast as it goes downward from the side of the mast; The upper portion of the diagonal member is detachably connected to the mast, An attachment hole is formed on the outer surface of the mast, the attachment hole penetrating in the inward and outward direction of the mast, An attachment portion to be inserted into the attachment hole is provided on an upper portion of the diagonal member, A pin hole is formed at an end of the mounting portion so as to penetrate in the vertical direction. A support structure for a mast of a tower crane, in which a locking pin is engaged in the pin hole.

2. 2. The support structure for a mast of a tower crane according to claim 1, wherein the head of the anti-slip pin is engaged with the pin hole.

3. 3. The support structure for a mast of a tower crane according to claim 1, wherein the vertical length of the anti-slip pin is longer than the vertical length of the mounting hole.

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