Crane system and construction method

Abstract

To provide a crane system and the like capable of coping with various purposes while using one crane body by devising a configuration of a supporting part supporting the crane body.SOLUTION: A crane system for construction is provided. The crane system includes a crane body and a supporting part. The supporting part is configured to support the crane body and has a plurality of modes or a plurality of types.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a crane system and a construction method. [Background technology]

[0002] Conventionally, when constructing a steel tower, a low-floor crane is first positioned at the outer position of the steel tower to be constructed, and foundation work for the steel tower is carried out. After that, a climbing crane is positioned at the center of the steel tower, and the steel tower components are transported and assembled to construct the steel tower (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-12274 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the construction sites for steel towers are often narrow and difficult to access, so helicopters and monorails are sometimes used to transport materials. Therefore, it is inefficient to transport and assemble two cranes to construct one steel tower. In addition, the foundation work required to install two cranes would also need to be done twice.

[0005] In view of the above circumstances, the present invention provides a crane system that can be used for a variety of purposes while using a single crane body, by devising a configuration for the support part that supports the crane body. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a crane system for construction, the crane system comprising a crane body and a support part, the support part being configured to be able to support the crane body and having a plurality of forms or types.

[0007] According to this embodiment, it is possible to use one crane body for a variety of purposes. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing a first embodiment of a crane system. [Figure 2] FIG. 1 is a schematic diagram showing a first embodiment of a crane system. [Figure 3] FIG. 1 is a schematic diagram showing a first embodiment of a crane system. [Figure 4] FIG. 1 is a schematic diagram showing a first embodiment of a crane system. [Figure 5] FIG. 1 is a schematic diagram showing a first embodiment of a crane system. [Figure 6] FIG. 2 is a schematic diagram showing a mounting structure for mounting the balancing mechanism to the crane body. [Figure 7] FIG. 2 is a block diagram showing the hardware configuration of a computer. [Figure 8] FIG. 4 is a schematic diagram showing a second embodiment of the crane system. [Figure 9] FIG. 4 is a schematic diagram showing a second embodiment of the crane system. [Figure 10] FIG. 4 is a schematic diagram showing a second embodiment of the crane system. [Figure 11] FIG. 4 is a schematic diagram showing a second embodiment of the crane system. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. Various features shown in the following embodiments can be combined with each other.

[0010] Incidentally, the program for realizing the software appearing in this embodiment may be provided as a non-transitory computer-readable medium, or may be provided so that it can be downloaded from an external server, or may be provided so that the program is started on an external computer and its functions are realized on a client terminal (so-called cloud computing).

[0011] In this embodiment, the term "unit" may also include, for example, a combination of hardware resources implemented by a circuit in the broad sense and software information processing that can be specifically realized by these hardware resources. In addition, various types of information are handled in this embodiment, and this information may be represented by, for example, physical values ​​of signal values ​​representing voltages and currents, high and low signal values ​​as a binary bit set consisting of 0 or 1, or quantum superposition (so-called quantum bits), and communication and calculations may be performed on a circuit in the broad sense.

[0012] In addition, a circuit in the broad sense is a circuit realized by at least appropriately combining a circuit, circuitry, a processor, a memory, etc. That is, it includes an application specific integrated circuit (ASIC), a programmable logic device (e.g., a simple programmable logic device (SPLD), a complex programmable logic device (CPLD), and a field programmable gate array (FPGA)), etc.

[0013] First Embodiment First, a first embodiment of a crane system according to the present invention will be described. 1A. Overall structure 1A.1 Basic configuration First, the basic configuration of a crane system 1A according to the first embodiment will be described. Figures 1 to 5 are schematic diagrams showing the first embodiment of the crane system. Figure 6 is a schematic diagram showing an attachment structure for attaching a balancing mechanism to a crane body. In the following description, the vertically upper side will be simply referred to as "upper side" or "upper side," and the vertically lower side will be simply referred to as "lower side" or "lower side."

[0014] The crane system 1A is capable of climbing by its own mechanism as the height of a building increases. As shown in FIG. 1, the crane system 1A comprises a mast 2, a crane body 3, a base mast 4, and a base frame (foundation structure) 5. In other words, the crane system 1A has the mast 2 and base mast 4 on top of the base frame 5, with the crane body 3 installed on top of the mast 2 and base mast 4. In this embodiment, the mast 2 and base mast 4 form a support unit capable of supporting the crane body 3.

[0015] (Mast 2) The mast 2 is configured to support the crane body 3. The mast 2 is assembled and extended by connecting a plurality of unit masts 21 in the longitudinal direction. In particular, in the crane system 1A, the mast 2 is configured so that the height of the crane body 3 can be adjusted to match the height of the building being constructed by changing the number of unit masts 21 to be connected. Each unit mast 21 has, for example, a rectangular cylindrical shape. A plurality of (four in the illustrated configuration) elliptical through-holes are provided on each of the four side surfaces of the unit mast 21 along the longitudinal direction.

[0016] (Crane body 3) The crane body 3 comprises a rotating body 31, a jib 32, a hoisting winch 33, a hoisting rope 34, and a hook 35. The rotating body 31 is rotatably supported by a slewing bearing (not shown) provided at the top of the mast 2. The jib 32 is supported by the rotating body 31, extends forward and backward, and is configured to be able to rise and fall. The hoisting winch 33 is fixed to the rotating body 31 and is configured to be able to hoist or lower the hoisting rope 34. A hook 35 is provided at the end of the hoisting rope 34.

[0017] (Base mast 4) The base mast 4 supports the lower portion of the mast 2, and is firmly fixed to the base frame 5 using bolts (not shown) or the like. In this embodiment, the base mast 4 is configured as a rectangular parallelepiped frame body by four support columns 41 extending in the vertical direction (height direction) and a plurality of beams 42 connecting the support columns 41 to each other. A storage space 40 capable of accommodating the lower portion of the mast 2 and the unit masts 21 is formed inside the base mast 4. The storage space 40 is also provided with a plurality of rollers (not shown) that allow the mast 2 to move vertically but restrict its movement in the horizontal direction.

[0018] (Base frame 5) The base frame 5 includes a frame body 51 that supports the mast 2 and the base mast 4 (support portion), and four legs 52. Each figure shows an example in which the crane system 1A is installed on a slope such as a mountainous region. Of the four legs 52, the legs 52 on the front and back sides of the page extend horizontally, while the legs 52 on the right and left sides of the page extend at an angle corresponding to the slope.

[0019] The crane system 1A further includes a mast lifting mechanism 6 and a balancing mechanism 7. (Mast lifting mechanism 6) As shown in FIG. 1, the mast lifting mechanism 6 includes a rope winch 61, a wire rope 62, a sheave 63, and a fixed portion 64. The rope winch 61 is fixed onto the base frame 5. The base end side (one end side) of a wire rope 62 is wound around the rope winch 61.

[0020] The sheave 63 is rotatably provided on the upper side of the base mast 4. The wire rope 62 is wound around the sheave 63 and then pulled into the storage space 40, and its tip (other end) is fixed to the mast 2 (a specified unit mast 21 located below) via the fixing part 64. According to this configuration, the mast 2 can be raised in the vertical direction by winding up the wire rope 62 with the rope winch 61.

[0021] (Balance mechanism 7) The balance mechanism 7 is provided on the side opposite to the side where the jib 32 of the crane body 3 extends, and has the function of maintaining the balance of the entire crane system 1A (climbing crane) and preventing it from tipping over. The balance mechanism 7 includes a counter frame 71 and a counter weight 72 that can be installed on the counter frame 71. By changing the overall weight of the counter weight 72, the balance of the crane system 1A can be maintained.

[0022] 6, the rotating body 31 of the crane body 3 has a rotating frame 311 and a mounting structure 312. A jib 32 and a hoisting winch 33 are attached to the rotating frame 311. The revolving frame 311 is made compact in plan view, for example, in a rectangular (square) shape with one side measuring 1600 mm so that it can pass through an internal opening in a completed steel tower. Two through holes 3112 are formed in the outer frame 3111 of the revolving frame 311 on the side opposite to the side on which the jib 32 extends.

[0023] The mounting structure 312 includes a mounting plate 3121 , a bolt portion 3122 connected to an end of the mounting plate 3121 , and a nut 3123 that screws onto the bolt portion 3122 . The mounting plate 3121 can be fixed to the revolving frame 311 by inserting the bolt portion 3122 into the through hole 3112 and screwing and tightening the nut 3123 onto the bolt portion 3122. On the other hand, from this state, the mounting plate 3121 can be detached from the revolving frame 311 by loosening the nut 3123, removing it from the bolt portion 3122, and pulling the bolt portion 3122 out of the through hole 3112. In other words, the mounting structure 312 is configured to be detachable from the revolving frame 311.

[0024] The counter frame 71 of the balance mechanism 7 can be attached to this mounting structure 312. The counter frame 71 has a long arm portion 711 and a mounting portion 712 connected to one end of the arm portion 711. The mounting portion 712 is configured so that the counterweight 72 can be placed thereon. The arm portion 711 has a first mounting portion 7111 at its other end that can be attached to the mounting structure 312 (mounting plate 3121) of the crane body 3, and a second mounting portion 7112 that can be attached to the base mast 4 (support portion) is provided between the one end and the other end (midway along the longitudinal direction).

[0025] The first mounting portion 7111 and the second mounting portion 7112 each have the same shape as the mounting plate 3121 , and are formed integrally with the arm portion 711 . Also, a mounting portion 411 having a shape similar to that of the mounting plate 3121 is formed integrally with the support 41 midway along the vertical direction of the base mast 4 . The first mounting portion 7111 is attached to the mounting plate 3121 of the mounting structure 312 by, for example, bolts and nuts, mounting pins, etc. The second mounting portion 7112 is also attached to the mounting portion 411 of the base mast 4 by, for example, bolts and nuts, mounting pins, etc.

[0026] With this configuration, the support part of this embodiment has two forms: a first form (see Figure 1) in which the counter frame 71 is not attached to the base mast 4 (mounting part 411) but is attached to the crane body 3 (swivel frame 311), and a second form (see Figure 4) in which the counter frame 71 is removed from the crane body 3 and attached to the base mast 4. In the first mode, the counter frame 71 is attached to the crane body 3 via the first attachment portion 7111, with the first attachment portion 7111 (other end) of the arm portion 711 positioned higher than the base portion 712 (one end). In this case, the base portion 712 is closer to the ground, making it easier to attach and detach the counterweight 72 to and from the base portion 712. This improves workability, particularly when working on an inclined surface as shown in the figure.

[0027] In the first mode, the counter frame 71 is attached to the crane body 3 and is further pulled by the wire rope 73 to the crane body 3, so that the crane body 3 is not allowed to rotate. Specifically, the crane body 3 includes a compression rod 36 and a tension rod 37 that are erected on the swivel frame 311 . The tension rods 37 are arranged on the opposite side of the jib 32 via the compression rods 36, with their lower ends spaced apart from each other at the edge of the revolving frame 311, and their upper ends connected to each other.

[0028] A wire rope 73 fixed to a counter frame 71 is connected to the upper ends of the compression rod 36 and the tension rod 37. The counter frame 71 (counterweight 72) is located on the opposite side of the tension rod 37 from the compression rod 36. For this reason, compressive stress from the counter frame 71 (counterweight 72) acts on the tension rod 37. Therefore, in this embodiment, the buckling strength of the tension rod 37 is set to be large in accordance with the counter frame 71 (counterweight 72). This ensures sufficient mechanical strength for the entire crane body 3. Furthermore, tension rods in general cranes bear tensile loads, but not compressive loads. The buckling strength can be increased by, for example, selecting the material of the component parts, selecting the size of the component parts, and the like.

[0029] On the other hand, in the second mode, the counter frame 71 is detached from the crane body 3, and the crane body 3 is allowed to rotate. Therefore, in the second mode, as shown in Figure 4, if the crane body 3 is rotated so that the jib 32 faces left (approximately 180° from the state in Figure 1), the counterweight 72 can be removed from the counter frame 71 by the crane body 3. With this configuration, the counterweight 72 can be attached to and detached from the counter frame 71 safely and easily without requiring a separate mechanism such as a crane.

[0030] In the crane system 1A of this embodiment, when the support section is in the second configuration, the crane body 3 has a raised floor. That is, the crane system 1A can be used as a climbing crane. In order to raise the floor of the crane body 3, the crane system 1A further includes a unit mast retracting mechanism 80 and a unit mast erecting mechanism 85, as shown in FIG. The unit mast retraction mechanism 80 can be configured to be detachable from the base mast 4 (support portion).

[0031] (Unit mast retraction mechanism 80) The unit mast retraction mechanism 80 is configured with a hoist, and suspends and transports the unit mast 21. In this way, the unit mast retraction mechanism 80 can move the suspended unit mast 21 toward and away from the base mast 4. As shown in Figure 5, the unit mast retraction mechanism 80 suspends the unit mast 21 midway in the longitudinal direction, so that the unit mast 21 is naturally tilted relative to the horizontal direction and can be transported in this state.

[0032] (Unit mast erection mechanism 85) The unit mast erection mechanism 85 is configured to be rotatable between a first position (see Figure 5) in which it receives the unit mast 21 transported by the unit mast retraction mechanism 80, and a second position in which it places the unit mast 21 in an erect state. The unit mast erection mechanism 85 is inclined relative to the horizontal direction at the first position, and can receive the unit mast 21 in an inclined state.

[0033] 1A.2 Computers for managing construction work9 Next, the computer 9 will be described. FIG. 7 is a block diagram showing the hardware configuration of a computer.

[0034] In this embodiment, as shown in FIGS. 1 to 5, a computer 9 is used when the crane body 3 operates or when the unit masts 21 are extended to raise the floor. The computer 9 is mounted on, for example, the crane body 3, and is configured to manage the progress and process of construction. The computer 9 is, for example, a dedicated control device, and as shown in Fig. 7, has a communication unit 91, a storage unit 92, and a control unit 93, and these components are electrically connected via a communication bus 90. Each component will be further described below.

[0035] The communication unit 91 is configured to be able to transmit various electrical signals from the computer 9 to external components. The communication unit 91 is also configured to be able to receive various electrical signals from external components to the computer 9. More preferably, the communication unit 91 has a network communication function, which allows communication of various information with external devices via a network such as the Internet. For example, the communication unit 91 may acquire data regarding the current altitude from a sensor (not shown) provided in a part of the crane system 1A.

[0036] The memory unit 92 stores various pieces of information defined above. This can be implemented, for example, as a storage device such as a solid state drive (SSD) that stores various programs and the like related to the crane system 1A executed by the control unit 93, or as a memory such as a random access memory (RAM) that stores temporarily required information (arguments, arrays, etc.) related to program calculations. The memory unit 92 stores various programs, variables, etc. related to the crane system 1A executed by the control unit 93. It is particularly preferable that information related to construction plans to be carried out using the crane system 1A be stored.

[0037] The control unit 93 is, for example, a central processing unit (CPU) not shown. The control unit 93 realizes various functions related to the crane system 1A by reading out predetermined programs stored in the memory unit 92. In other words, information processing by the software stored in the memory unit 92 is specifically realized by the control unit 93, which is an example of hardware. Note that the control unit 93 is not limited to being a single unit, and the system may be implemented with multiple control units 93 for each function. Alternatively, a combination of these may be used.

[0038] In this embodiment, the control unit 93 manages the progress of the construction work based on a dedicated program previously stored in the storage unit 92. The control unit 93 can also estimate the required height of the mast 2 based on information about the current altitude acquired by the communication unit 91 and information about the construction plan stored in the storage unit 92.

[0039] 2A. Construction method using crane system 1A Next, a construction method using the above-described crane system 1A will be described. First, as shown in Fig. 1, the crane system 1A, whose support part is in the first form, is assembled at the center position of the steel tower T to be constructed. That is, the crane system 1A is used with the support part positioned inside the steel tower T to be constructed. In this state, the counter frame 71 is attached to the swivel frame 311 of the crane body 3 via the first attachment part 7111 and the attachment plate 3121. In addition, since the placement part 712 is located close to the ground, it is easy to attach and detach the counterweight 72 to and from the placement part 712.

[0040] Next, as shown in FIG. 2, the crane body 3 is used to build a steel tower foundation B around the crane system 1A. At this time, the tower foundation B and the end of the placing part 712 are connected via a chain block CB. Next, as shown in Fig. 3, the wire rope 73 is removed and the tension applied by the chain block CB is gradually relaxed, causing the counter frame 71 to approach the base mast 4 (support portion). Thereafter, the second mounting portion 7112 is mounted to the mounting portion 411 of the base mast 4. In this state, the counter frame 71 is mounted to both the swivel frame 311 of the crane body 3 and the base mast 4 (third form).

[0041] Next, as shown in FIG. 4, the first mounting portion 7111 is removed from the swivel frame 311 of the crane body 3 together with the mounting plate 3121 (mounting structure 312). At this time, the center of gravity CG of the counterweight 72 is located outside the attachment position of the second attachment part 7112 to the attachment part 411, so the placement part 712 rotates around the second attachment part 7112 until it comes into contact with the base mast 4, while the first attachment part 7111 moves away from the swivel frame 311 of the crane main body 3. In this state, the crane main body 3 is allowed to rotate.

[0042] Next, as shown in Figure 4, the counterweight 72 can be suspended from the crane body 3 and lowered to the ground from the mounting part 712. Similarly, the counter frame 71 itself can also be suspended from the crane body 3 and lowered to the ground. Thereafter, as shown in FIG. 5, the base mast 4 (supporting part) is fixed to the steel tower foundation B via a wire rope W for preventing the base from falling over. Next, as the construction of the steel tower T progresses, the steel tower T becomes taller, and accordingly, the mast 2 will be added accordingly. Therefore, the required height of the mast 2 is estimated appropriately using the computer 9.

[0043] At this time, it is checked whether the height of the above-mentioned mast 2 exceeds the standard value, and if it does not, the mast 2 is extended to reach the estimated height and construction continues. First, the mast 2 supporting the crane body 3 is moved upward together with the crane body 3 by the mast lifting mechanism 6. Next, the unit mast 21 is transported by the unit mast retraction mechanism 80 and is arranged in an erected state below the mast 2 by the unit mast erection mechanism 85.

[0044] Thereafter, the lower end of the mast 2 and the upper end of the unit mast 21 are connected with, for example, bolts and nuts (not shown). This allows the length of the mast 2 to be extended, and the crane body 3 to have a higher floor. Thereafter, construction work is carried out on the steel tower T under construction using the crane system 1A. On the other hand, when lowering the crane body 3, the above-described steps can be reversed to disassemble the mast 2 into the unit masts 21 one by one.

[0045] Here, after the construction of the steel tower T is completed, as shown in Fig. 6, there is no gap of sufficient size between the revolving frame 311 and the top of the steel tower T. In this embodiment, since the mounting structure 312 can be removed from the revolving frame 311, there are no members protruding outward from the revolving frame 311. Therefore, when the crane body 3 is lowered (reverse climbing), the revolving frame 311 and the steel tower T do not interfere with each other, and the work can be carried out smoothly.

[0046] As described above, in the first embodiment, construction work is carried out by operating the crane body 3 while changing the configuration of the support part. Therefore, by using one crane body to construct one steel tower T, it is possible to reliably construct steel tower T even in areas where it is difficult to transport large amounts of materials, such as narrow areas or mountainous areas, and it is also possible to expand the range of options for construction plans. In addition, since there is no need to prepare multiple fixed cranes that require foundation work, this also contributes to reducing the construction costs of the steel tower T.

[0047] Second Embodiment Next, a second embodiment of the crane system of the present invention will be described, but the description of the same points as in the first embodiment will be omitted and the differences will be mainly described. 1B.Overall configuration 8 to 11 are schematic diagrams showing a second embodiment of the crane system. The crane system 1B of the second embodiment is similar to the crane system 1A of the first embodiment except that it has two types of support parts that support the crane main body 3 and that the construction method is different.

[0048] The support portion of the second embodiment has a first support portion 10 and a second support portion 20, as shown in FIG. The height (vertical length) of the first support part 10 is designed to be smaller than the height (vertical length) of the second support part 20. The crane body 3 is configured so that the first support part 10 and the second support part 20 can be replaced with each other. Therefore, in this embodiment, a crane with the crane body 3 attached to the first support part 10 is used as a low-platform crane, and a crane with the crane body 3 attached to the second support part 20 is used as a high-platform crane.

[0049] In particular, the second support section 20 has a mast 2, which is extended by connecting a plurality of unit masts 21 in the longitudinal direction, and is configured to be able to adjust the height of the crane body 3. In other words, the high platform crane can be used as a climbing crane. The first support section 10 also has a low mast 2' that is shorter (has a shorter vertical length) than the unit mast 21. The height of the low mast 2' is not particularly limited, but is set to about 1500 to 2300 mm. The low-profile crane is placed outside the steel tower T to be constructed, and is used, for example, to perform work such as constructing the foundation of the steel tower T and assembling the second support part 20.

[0050] The low platform crane is equipped with a balancing mechanism 7. The balancing mechanism 7 includes a counter frame 71 and a counter weight 72 that can be installed on the counter frame 71. It has a counter frame 71, a long arm portion 711, and a mounting portion 712 connected to one end of the arm portion 711. The mounting portion 712 is configured so that the counterweight 72 can be placed thereon. The arm portion 711 is provided at its other end with a mounting portion 7111 for mounting to the mounting structure 312 (mounting plate 3121) of the crane body 3.

[0051] In this embodiment, since the low platform crane has a low mast 2', with the crane body 3 connected to the first support part 10, the counter frame 71 is attached to the crane body 3 via the attachment part 7111 so that the arm part 711 is approximately perpendicular to the vertical direction (extends approximately horizontally), as shown in Figures 8 and 9. When working on an inclined surface as shown in the figures, the mounting part 712 is close to the ground, making it easier to attach and detach the counterweight 72 to and from the mounting part 712. In this specification, the term "substantially perpendicular to the vertical direction" is not limited to being strictly perpendicular to the vertical direction (forming an angle of 90°), but is a concept that includes a slight error (approximately ±2 to 3°). In particular, conventional low-profile cranes are not provided with a low-profile mast 2'. Therefore, when attempting to attach the balancing mechanism 7 for work on an inclined surface, it is necessary to fix the counter frame 71 (arm portion 711) to the swivel frame 311 in an inclined state, which tends to make the attachment mechanism complicated.

[0052] The first support 10 further includes a base frame (foundation structure) 5. The base frame 5 includes a frame body 51 that supports the mast 2 and the base mast 4 (first support portion), and four legs 52. Each figure shows an example in which the crane system 1B is installed on a slope such as a mountainous region. Of the four legs 52, the legs 52 on the front and back sides of the page extend horizontally, while the legs 52 on the right and left sides of the page extend at an angle corresponding to the slope. On the other hand, the second support part 20 has a base frame 5' that is cross-shaped in a plan view, and is placed on flat, level ground. This position is the center position of the steel tower T to be constructed.

[0053] 2B. Construction method using crane system 1B Next, a construction method using the above-described crane system 1B will be described. First, as shown in FIG. 8, a crane system 1B (low platform crane) having a first support part 10 is assembled at a position outside a steel tower T to be erected. In this state, the counter frame 71 is attached to the swivel frame 311 of the crane body 3 via the attachment portion 7111 and the attachment plate 3121. In addition, since the placement portion 712 is located close to the ground, it is easy to attach and detach the counterweight 72 to and from the placement portion 712.

[0054] Next, as shown in FIG. 9, the crane body 3 is used to build a tower foundation B at a position corresponding to the tower T to be constructed. Next, the crane body 3 is used to assemble the second support part 20 at the center position of the steel tower T to be constructed. At this time, the base mast 4 (second support part 20) is fixed to the steel tower foundation B via a wire rope W to prevent it from falling over. In other words, the crane system 1B (high-floor crane) is used with the second support part 20 positioned inside the steel tower T to be constructed.

[0055] 10, for example, another mobile crane (not shown) is used to dismantle the low platform crane and move the crane body 3 from the first support part 10 to the second support part 20. At this time, the balancing mechanism 7 is removed from the crane body 3. Next, as shown in FIG. 11, as the construction of the steel tower T progresses, the tower T becomes taller, so the mast 2 is extended as appropriate to increase the height of the crane body 3.

[0056] As described above, in the second embodiment, the crane body 3 is operated to proceed with construction work while replacing the support part with a different type (the first support part 10 or the second support part 20). Therefore, by using one crane body to construct one steel tower T, it is possible to reliably construct steel tower T even in areas where it is difficult to transport large amounts of materials, such as narrow areas or mountainous areas, and it is also possible to expand the range of options for construction plans. In addition, since a single crane body 3 can be used for a long period of time, it also contributes to reducing the construction costs of the steel tower T.

[0057] 3.Other The crane systems 1A and 1B according to the present embodiment may be implemented in the following manner. (1) In the present embodiment, the crane systems 1A and 1B are used on sloping ground, but they may also be used on flat ground. (2) In this embodiment, the crane systems 1A and 1B are used to construct a steel tower T, but they may also be used to construct structures other than the steel tower T.

[0058] (3) In the first embodiment, the support portion may have three or more different types. In the second embodiment, the support portion may have three or more different types. (4) In this embodiment, the mast lifting mechanism 6 is configured as a wire rope type equipped with a wire rope 62, but is not limited to this and may be configured as a cylinder type, a jack type, or a combination of these.

[0059] (5) In this embodiment, the unit mast retraction mechanism 80 is configured as a hoist, but is not limited to this and may be the crane body 3. Specifically, the unit mast 21 can be hooked onto the hook 35 of the crane body 3 and transported. (6) In this embodiment, the computer 9 determines whether or not to raise the floor of the crane body 3. However, such determination and decision may be made manually by the user.

[0060] (7) Furthermore, it may be provided in the following forms. The crane system further includes a counter frame and a counter weight, the counter weight being mountable on the counter frame. In the crane system, the support has a first configuration in which the counter frame is not attached to the support but is attached to the crane body, and a second configuration in which the counter frame is detached from the crane body and attached to the support. In the crane system, the counter frame has an arm portion and a base portion, the arm portion is long and has one end and the other end, the base portion is connected to the one end of the arm portion, a first mounting portion that can be attached to the crane body is provided at the other end, a second mounting portion that can be attached to the support portion is provided between the one end and the other end, and the base portion is configured to allow the counterweight to be installed. In the crane system, in the first form, the counter frame is attached to the crane body via the first mounting portion with the other end of the arm portion positioned higher than the one end. In the crane system, in the second configuration, the crane body is allowed to rotate. In the crane system of the second embodiment, the counterweight is configured to be detachable from the counter frame by the crane body. In the crane system, the support portion has a mast, and the mast is extended by connecting a plurality of unit masts in the longitudinal direction, and is configured to allow the height of the crane body to be adjusted. The crane system further includes a foundation structure, the foundation structure supporting the support. The crane system is used with the support part positioned inside the steel tower to be erected. In the crane system, the support part has two types, a first support part and a second support part, the vertical length of the first support part is designed to be smaller than the vertical length of the second support part, and the crane body is configured to be interchangeable between the first support part and the second support part. In the crane system, the counter frame has an arm portion and a base portion, the arm portion is long and has one end and the other end, the base portion is connected to the one end of the arm portion, and an attachment portion is provided at the other end for attachment to the crane body, and the base portion is configured to be able to install the counterweight. In the crane system, with the crane body connected to the first support part, the counter frame is attached to the crane body via the mounting part so that the arm part is approximately perpendicular to the vertical direction. The crane system further includes a foundation structure, the foundation structure supporting the first support. In the crane system, the second support portion has a mast, and the mast is extended by connecting a plurality of unit masts in the longitudinal direction, and is configured to allow the height of the crane body to be adjusted. The crane system is used with the second support part positioned inside the steel tower to be erected. In the crane system, the crane body has a rotating frame and a mounting structure, and the mounting structure is configured to be detachable from the rotating frame and can mount the counter frame. In the crane system, the crane body has a jib, a compression rod, and a tension rod, the tension rod is arranged on the opposite side of the jib via the compression rod, and the buckling strength of the tension rod is set to be large according to the counter frame. A construction method using a crane system, the crane system comprising a crane body and a support part, the support part being configured to be able to support the crane body and having a plurality of forms or a plurality of types, and the construction work proceeding by operating the crane body while changing the form of the support part or replacing it with a different type of support part. Of course, this is not the case.

[0061] Finally, while various embodiments of the present invention have been described, these are presented by way of example only and are not intended to limit the scope of the invention. The novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. Such embodiments and modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as defined in the accompanying claims. [Explanation of symbols]

[0062] 1A, 1B: Crane system 2: Mast 21: Unit mast 2': Low mast 3: Crane body 31: Rotating body 311: Swivel frame 312: Mounting structure 32: Jib 33: Hoisting winch 34: Hoisting rope 35: Hook 36: Compression rod 37: Tension rod 4: Base mast 411: Mounting part 7: Balance mechanism 71: Counter frame 711: Arm part 7111: First mounting part (mounting part) 7112: Second mounting part 712: Placement section 72: Counterweight 73: Wire rope B: Tower foundation CB: Chain block CG: Center of gravity T: Steel tower W: Wire rope

Claims

1. 1. A construction crane system, comprising: The crane comprises a crane body, a support, a counter frame, and a counter weight, The support portion is configured to be able to support the crane body and has a plurality of forms or a plurality of types, The counterweight is mountable on the counter frame; The support portion has a first configuration in which the counter frame is not attached to the support portion but is attached to the crane body, and a second configuration in which the counter frame is detached from the crane body and attached to the support portion.

2. 2. The crane system according to claim 1, The counter frame has an arm portion and a mounting portion, The arm portion is elongated and has one end and the other end, the placing portion is connected to the one end of the arm portion, a first mounting portion that can be attached to the crane body is provided at the other end, and a second mounting portion that can be attached to the support portion is provided between the one end and the other end, The mounting portion is configured so that the counterweight can be placed thereon.

3. 3. The crane system according to claim 2, In the first embodiment, the counter frame is attached to the crane body via the first mounting portion with the other end of the arm portion positioned higher than the one end.

4. The crane system according to any one of claims 1 to 3, In the second mode, the crane body is allowed to rotate.

5. The crane system according to any one of claims 1 to 4, In the second embodiment, the counterweight is configured to be detachable from the counter frame by the crane body.

6. The crane system according to any one of claims 1 to 5, the support portion includes a mast; The mast is extended by connecting a plurality of unit masts in the longitudinal direction, and is configured so that the height of the crane body can be adjusted.

7. The crane system according to any one of claims 1 to 6, Further, the device has a base structure, The base structure supports the support.

8. The crane system according to any one of claims 1 to 7, It is used with the support part positioned inside the steel tower to be constructed.

9. A construction crane system, The crane comprises a crane body, a support, a counter frame, and a counter weight, The support portion is configured to be able to support the crane body and has a plurality of forms or a plurality of types, The counterweight is mountable on the counter frame; The support portion includes two types: a first support portion and a second support portion; The vertical length of the first support portion is designed to be smaller than the vertical length of the second support portion, The crane body is configured to be replaceable between the first support part and the second support part, The first support is positioned on the outside of the pylon to be erected, while the second support is positioned on the inside of the pylon to be erected.

10. 10. The crane system according to claim 9, The counter frame has an arm portion and a mounting portion, The arm portion is elongated and has one end and the other end, The placement portion is connected to the one end of the arm portion, and a mounting portion to be attached to the crane body is provided at the other end of the arm portion, The mounting portion is configured so that the counterweight can be placed thereon.

11. 11. The crane system according to claim 10, With the crane body connected to the first support portion, the counter frame is attached to the crane body via the mounting portion so that the arm portion is approximately perpendicular to the vertical direction.

12. The crane system according to any one of claims 9 to 11, Further, the device has a base structure, The base structure supports the first support.

13. A construction crane system, comprising: The crane comprises a crane body, a support, a counter frame, and a counter weight, The support portion is configured to be able to support the crane body and has a plurality of forms or a plurality of types, The counterweight is mountable on the counter frame; The support portion includes two types: a first support portion and a second support portion; The vertical length of the first support portion is designed to be smaller than the vertical length of the second support portion, The crane body is configured to be replaceable between the first support part and the second support part, the second support portion includes a mast; The mast is extended by connecting a plurality of unit masts in the longitudinal direction, and is configured so that the height of the crane body can be adjusted.

14. 14. The crane system of claim 13, The second support part is used with the second support part positioned inside the steel tower to be constructed.

15. The crane system according to any one of claims 1 to 14, The crane body has a rotating frame and a mounting structure, The mounting structure is configured to be detachable from the swivel frame, and the counter frame can be mounted thereon.

16. The crane system according to any one of claims 1 to 15, The crane body has a jib, a compression rod, and a tension rod, The tension rod is disposed on the opposite side of the jib via the compression rod, The buckling strength of the tension rod is set to be large according to the counter frame.

17. A construction method using a crane system, comprising: The crane system includes a crane body, a support, a counter frame, and a counterweight, The support portion is configured to be able to support the crane body and has a plurality of forms or a plurality of types, The counterweight is mountable on the counter frame; The support portion has a first configuration in which the counter frame is not attached to the support portion but is attached to the crane body, and a second configuration in which the counter frame is detached from the crane body and attached to the support portion, A method for proceeding with construction work by operating the crane body while changing the configuration of the support part or replacing it with a different type of support part.

18. A construction method using a crane system, comprising: The crane system includes a crane body, a support, a counter frame, and a counterweight, The support portion is configured to be able to support the crane body and has a plurality of forms or a plurality of types, The counterweight is mountable on the counter frame; The support portion includes two types: a first support portion and a second support portion; The vertical length of the first support portion is designed to be smaller than the vertical length of the second support portion, The crane body is configured to be replaceable between the first support part and the second support part, The first support is arranged on the outside of the pylon to be erected, while the second support is arranged on the inside of the pylon to be erected; A method for proceeding with construction work by operating the crane body while changing the configuration of the support part or replacing it with a different type of support part.

19. A construction method using a crane system, comprising: The crane system includes a crane body, a support, a counter frame, and a counterweight, The support portion is configured to be able to support the crane body and has a plurality of forms or a plurality of types, The counterweight is mountable on the counter frame; The support portion includes two types: a first support portion and a second support portion; The vertical length of the first support portion is designed to be smaller than the vertical length of the second support portion, The crane body is configured to be replaceable between the first support part and the second support part, the second support portion includes a mast; The mast is extended by connecting a plurality of unit masts in the longitudinal direction, and the height of the crane body is adjustable. A method for proceeding with construction work by operating the crane body while changing the configuration of the support part or replacing it with a different type of support part.

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