Crane system for steel tower construction and method for constructing steel towers using the said crane system

Abstract

The objective is to provide a crane system for constructing transmission towers that can be connected to the tower using general-purpose components, without being restricted by the height of the tower being constructed, and a method for constructing transmission towers using said crane system. [Solution] A crane system A for constructing a steel tower comprises a support mast 1 and a crane 3 for constructing the steel tower. The support mast 1 is located approximately in the center of the inside of the steel tower 5, and the crane 3 is located outside the construction area of ​​the steel tower 5. The support mast 1 and the steel tower 5 are connected using a plurality of first connecting members 6, each first connecting member 6 connecting the support mast 1 to one of the main column members 51 provided on the steel tower 5. The crane 3 and the support mast 1 are connected using a second connecting member 7.

Description

Technical Field

[0001] The present invention relates to a crane system for tower construction used in the construction of towers such as transmission line towers for erecting transmission lines and radio towers serving as radio relay bases, and a tower construction method using the crane system.

Background Art

[0002] Conventionally, when assembling a high tower in a place where there is no construction land such as mountainous areas or places with dense housing, it is common to use a "climbing crane" that raises and lowers the crane inside the tower instead of a crane truck.

[0003] However, since the climbing crane raises and lowers the crane inside the tower, the size of the crane is limited to one that can pass through the inside of the tower. Therefore, the lifting capacity is also restricted. That is, it is necessary to perform a strength calculation in advance, such as whether the climbing crane can withstand the lifting load when lifting the main column materials and the like related to the tower to be assembled. In addition, since the winding length of the wire wound around the winding wire drum is limited, the height of the tower to which the climbing crane can be applied is also restricted. Further, it is necessary to increase the strength of the guy wire (stay) supporting the tower more than usual.

[0004] Therefore, there is also a method of using an "external tower crane" (arranged outside the construction area of the tower) for tower construction. In the external tower crane, a mast (support column) is added on top of the uppermost crane body, and then the crane body is lifted. Alternatively, a mast is added at the bottom, and the entire tower crane is lifted.

[0005] When using an external tower crane, it is necessary to connect the tower crane and the tower using support members. However, because the tower has a slope (its sides are inclined), the distance between the tower and the tower crane varies depending on the height. Therefore, multiple types of support members of different lengths are required, and the amount of support members increases. In some cases, such a set of support members is required for each tower.

[0006] In such circumstances, for example, Patent Document 1 discloses a configuration in which a horizontal support member connecting a tower crane and a steel tower has an extension and retraction adjustment function. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 2579715 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0008] However, it is difficult for workers and other users to perform the cumbersome installation process of extending and adjusting horizontal support members to match different intervals while working at height. For workers and other users, it is desirable for the installation procedure to be as simple as possible.

[0009] Therefore, in order to address the above-mentioned problems, the present invention aims to provide a crane system for constructing steel towers that can be connected to a steel tower using general-purpose components without being restricted by the height of the steel tower to be constructed, and a method for constructing a steel tower using said crane system. [Means for solving the problem]

[0010] To achieve the above objective, the invention according to claim 1 is: A crane system for constructing steel towers, The crane system is equipped with a support mast and a crane for tower construction. The aforementioned support mast is installed approximately in the center of the inside of the tower. The crane is installed outside the construction area of ​​the tower. The support mast and the tower are connected using a plurality of first connecting members. Each of the first connecting members connects the support mast to one of the main column members provided on the tower. The crane and the support mast are connected using a second connecting member, forming a crane system.

[0011] Furthermore, the invention according to claim 2 is, One end of the first connecting member is connected to a first annular member provided on the outer circumference of the support mast, and the other end of the first connecting member is connected to one of the main column members provided on the tower. The crane system according to claim 1, wherein one end of the second connecting member is connected to an annular member provided on the outer circumference of the mast of the crane, and the other end of the second connecting member is connected to a second annular member provided on the outer circumference of the support mast.

[0012] Furthermore, the invention according to claim 3 is, One end of the first connecting member is connected to a first annular member provided on the outer circumference of the support mast, and the other end of the first connecting member is connected to one of the main column members provided on the tower. The crane system according to claim 1, wherein one end of the second connecting member is connected to an annular member provided on the outer circumference of the mast of the crane, and the other end of the second connecting member is connected to the first annular member provided on the outer circumference of the support mast.

[0013] Furthermore, the invention according to claim 4 is, A method for constructing a steel tower using a crane system for steel tower construction, The crane system is equipped with a support mast and a crane for tower construction. The support mast is installed approximately in the center of the inside of the transmission tower. The crane is installed outside the construction area of ​​the aforementioned tower. By using multiple first connecting members, the support mast is connected to one of the main column members provided on the tower, thereby connecting it to the tower. A second connecting member was used to connect the crane and the support mast in this tower construction method.

[0014] Furthermore, the invention according to claim 5 is, The connection between the support mast and the tower using the first connecting member is made by connecting one end of the first connecting member to a first annular member provided on the outer circumference of the support mast, and connecting the other end of the first connecting member to one of the main column members provided on the tower. The method for constructing a steel tower according to claim 4, wherein the connection between the crane and the support mast using the second connecting member is made by connecting one end of the second connecting member to an annular member provided on the outer circumference of the mast of the crane, and connecting the other end of the second connecting member to a second annular member provided on the outer circumference of the support mast.

[0015] Furthermore, the invention according to claim 6 is, The connection between the support mast and the tower using the first connecting member is made by connecting one end of the first connecting member to a first annular member provided on the outer circumference of the support mast, and connecting the other end of the first connecting member to one of the main column members provided on the tower. The method for constructing a steel tower according to claim 4, wherein the connection between the crane and the support mast using the second connecting member is made by connecting one end of the second connecting member to an annular member provided on the outer circumference of the mast of the crane, and connecting the other end of the second connecting member to the first annular member provided on the outer circumference of the support mast. [Effects of the Invention]

[0016] By using the present invention, without being restricted by the height of the tower to be constructed and without affecting the tower design, a general-purpose member can be used to connect a crane to a tower via a support mast without the need for special equipment. Also, the crane can be supported by the tower via the support mast. Thus, since the crane can be connected to the tower via the support mast using a general-purpose member, it is convenient to use an external tower crane when assembling a high tower in a place where there is no construction site such as mountainous areas or places with dense housing. Also, the crane is configured to be supported by the tower via the support mast. Therefore, in order to install the crane, it is not necessary to lay a strong foundation and remove the foundation after the construction of the tower, nor is it necessary to perform excavation work for installing the crane or use concrete or a pile driver, which is convenient. To install the crane, it is sufficient to lay a temporary foundation, reducing resources and work. Also, the support mast can be assembled together during the ground assembly (= pre-assembling the steel structure on the ground) of the tower to be constructed, which is convenient. Furthermore, since the length of the second connecting member connecting the crane and the support mast is the same regardless of the connecting height (position), users such as workers do not need to adjust the length of the second connecting member, and there will be no misidentification such as using members with different lengths during work at heights, etc., thus improving safety and productivity.

Brief Description of the Drawings

[0017] [Figure 1] It is a diagram showing the overall configuration of the crane system according to Embodiment Example 1 of the present invention. [Figure 2] It is an explanatory diagram showing the configuration of the crane system according to Embodiment Example 1 of the present invention in a sectional view from the planar direction. [Figure 3] It is an explanatory diagram explaining the process of constructing a tower using the crane system according to Embodiment Example 1 of the present invention. [Figure 4]This is an explanatory diagram illustrating the flow of construction of a steel tower using a crane system according to Embodiment 1 of the present invention. [Figure 5] This figure shows the overall configuration of a crane system according to Embodiment 2 of the present invention. [Figure 6] This is an explanatory diagram showing the configuration of a crane system according to Embodiment Example 2 of the present invention in a cross-sectional view from a planar direction. [Figure 7] This is an explanatory diagram showing the configuration of a crane system according to Embodiment Example 2 of the present invention in a cross-sectional view from a planar direction. [Figure 8] This figure shows the overall configuration of a crane system according to Embodiment 3 of the present invention. [Figure 9] This is an explanatory diagram showing the configuration of a crane system according to Embodiment 3 of the present invention in a cross-sectional view from a planar direction. [Figure 10] This is an explanatory diagram showing the configuration of a crane system according to Embodiment 3 of the present invention in a cross-sectional view from a planar direction. [Modes for carrying out the invention]

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. However, the components described in these embodiments are merely examples and are not intended to limit the scope of the present invention to them alone.

[0019] <Example of Embodiment 1> Figure 1 is a diagram showing the overall configuration of crane system A according to this embodiment example 1.

[0020] As shown in Figure 1, the crane system A according to this embodiment example 1, used for constructing the steel tower 5, comprises a support mast 1 and a crane 3 for steel tower construction.

[0021] <Configuration of Support Mast 1> The support mast 1 has a shape such as a rectangular prism, where the horizontal width remains constant from top to bottom, and is located approximately in the center of the inside of the tower 5. In this embodiment example 1, the support mast 1 is shown as a rectangular prism, but it is not limited to this configuration; for example, it may be cylindrical, and the point is that it should have a shape where the horizontal width remains constant from top to bottom.

[0022] Support mast 1 is raised by adding mast 11 to the top, according to the construction status of tower 5. In Figure 1, mast 11 is shown in its 14-section state after the addition of the mast 11.

[0023] The support mast 1 is connected to the tower 5 using, for example, a first connecting member 6 made of metal wire. More specifically, as shown in Figure 1, multiple annular members 61 (an example of the first annular members) are provided on the outer circumference of the support mast 1 at appropriate positions. Each first connecting member 6 is connected to the support mast 1 by connecting one end to this annular member 61. The other end of each first connecting member 6 is connected to one of the main column members 51 provided on the four sides of the tower 5. Therefore, the support mast 1 and the tower 5 are connected by the annular members 61 and four first connecting members 6, one end of which is connected to the annular member 61 and the other end of which is connected to one of the main column members 51 provided on the four sides of the tower 5. However, at lower points on the tower 5, the spacing between the main column members 51 is wide, and the annular members 61 may slide down due to their own weight if only the four first connecting members 6 connected to the main column members 51 are used. In that case, the annular member 61 may be further suspended by a metal wire or the like (not shown). In this way, the support mast 1 is connected to the sturdily constructed steel tower 5 using the first connecting member 6, thereby providing the stress necessary to resist torsional and overturning moments that occur in the support mast 1.

[0024] <Configuration of Crane 3> Crane 3 is an "external tower crane" that is attached to the outside of the tower 5 (i.e., positioned outside the construction area of ​​tower 5).

[0025] Crane 3 mainly consists of a crane body 31 and a mast 32.

[0026] The crane body 31 is equipped with well-known mechanisms of a crane, such as a slewing body 311, a jib 312, a hoisting winch (not shown), a hoisting rope 313, and a hook 314.

[0027] The mast 32 is a support column that supports the crane body 31. The mast 32 is added to the top of the tower 5 as it is assembled, raising the crane body 31. Figure 1 shows the mast 32 in a state where it has been extended to five sections. In this specification, the configuration in which the mast 32 is added to the top and the crane body 31 is raised is shown, but the specification is not limited to this configuration, and the mast 32 may also be added to the bottom and the crane body 31 may be pushed up.

[0028] As shown in Figure 2, the mast 32 of the crane 3 is connected to the support mast 1 using a second connecting member 7, which is a rigid body such as an H-beam. Both ends of the second connecting member 7 are connected to annular members 71 provided on the outer circumference of the mast 32 and the outer circumference of the support mast 1, respectively. The member 71 at one end of the second connecting member 7 is provided on the outer circumference of the mast 32, and the member 71 at the other end of the second connecting member 7 (an example of a second annular member) is provided on the outer circumference of the support mast 1. Thus, the mast 32 of the crane 3 is connected to the support mast 1 using the second connecting member 7. Figure 1 shows the state in which the mast 32 of the crane 3 and the support mast 1 are connected at appropriate upper and lower positions using two second connecting members 7. Here, "appropriate positions" refers to positions that can withstand the buckling moment (force that tries to bend the mast) and overturning moment (force that tries to overturn the mast) acting on the mast 32 and the support mast 1, respectively. In other words, the crane 3 is connected to the support mast 1, which is connected to the sturdily constructed steel tower 5, using the second connecting member 7, thereby obtaining the stress that resists the twisting and overturning moments that occur in the crane 3. Note that the annular member 71 and the annular member 61 described above are functionally the same.

[0029] As described above, the support mast 1 is for supporting the mast 32 of the crane 3. Therefore, it is sufficient that the support mast 1 can support the crane 3, with the mast 32 extended, up to a height that allows the tower 5 to be assembled. In other words, the support mast 1 only needs to be able to connect to the mast 32 of the crane 3, with the mast 32 extended, using the second connecting member 7, up to a height that allows the tower 5 to be assembled. Consequently, the height of the support mast 1 with the mast 11 extended can be lower than that of the tower 5 and the crane 3.

[0030] <Construction flow of tower 5 using crane system A> The workers and other users are adding mast 11 to the top of tower 5 to raise it, in order to construct support mast 1 approximately in the center of the inside of tower 5.

[0031] Then, for example, as shown in Figure 3, when the number of added masts 11 reaches seven, the support mast 1 is connected to the tower 5 using the first connecting member 6. More specifically, as shown in Figure 3, the fourth mast 11 from the bottom is connected to an appropriate location on each of the four main column members 51 of the tower 5 that corresponds to the horizontal direction, using the first connecting member 6. Note that although the above description states that the support mast 1 is connected to the tower 5 using the first connecting member 6 when the number of added masts 11 reaches a predetermined number, this is for the sake of explanation, and the position (height) at which the connection is made using the first connecting member 6 is determined by the load generated by the overhang of the crane 3 (the part of the crane body 31 that extends outward from the mast 32).

[0032] Next, as shown in Figure 4, the user, such as a worker, erects one mast 32 outside the construction area of ​​the tower 5 in order to attach the crane 3 to the tower 5. They then add another mast 32 to the top of that mast, and then add yet another mast 32 to the top of that. Finally, they raise the crane body 31 and position it on top of the three added masts 32.

[0033] Then, the user, such as a worker, connects the crane 3 to the support mast 1 using the second connecting member 7. Specifically, as shown in Figure 4, for example, the second mast 32 from the bottom of the crane 3 is connected to the sixth mast 11 from the bottom of the support mast 1, which corresponds to it horizontally, using the second connecting member 7. Although the above description states that the masts 32 are connected to the support mast 1 using the second connecting member 7 when the number of masts 32 reaches a predetermined number, this is for the sake of explanation, and the position (height) at which the connection is made using the second connecting member 7 is determined by the load generated by the overhang of the crane 3.

[0034] As described above, the following steps are repeated according to the assembly status of tower 5: "extend mast 11 → connect support mast 1 to tower 5 → extend mast 32 → connect crane 3 to support mast 1".

[0035] Furthermore, the workflow is not limited to the above procedure; for example, the workflow could be "extend mast 32 → extend mast 11 → connect support mast 1 to tower 5 → connect crane 3 to support mast 1".

[0036] However, it is preferable to maintain the order of connecting support mast 1 to tower 5, and then connecting crane 3 to support mast 1. This is because tower 5 will be a permanent fixture and will be firmly fixed, while crane 3 is a temporary fixture and will not necessarily be firmly fixed.

[0037] Thus, by using crane system A, the crane 3 can be connected to the tower 5 via the support mast 1 using the second connecting member 7, which is a versatile component, without being restricted by the height of the tower 5 to be constructed. Furthermore, the crane 3 can be supported by the tower 5 via the support mast 1. In this way, since the crane 3 can be connected to the tower 5 via the support mast 1 using the second connecting member 7, it is convenient to use an external tower crane when assembling a tall tower 5 in mountainous areas or densely populated residential areas where there is no construction site. In addition, the crane 3 is supported by the tower 5 via the support mast 1. Therefore, it is convenient because there is no need to pour a strong foundation to install the crane 3 and remove the foundation after the construction of the tower 5, nor is there any need for excavation work to install the crane 3, and there is no need to use concrete or pile drivers. To install the crane 3, it is sufficient to pour a temporary foundation, reducing resources and work. Furthermore, support mast 1 is convenient because it can be assembled together with the ground assembly of the tower being constructed (i.e., pre-assembling the steel frame on the ground). In addition, since the length of the second connecting member that connects the crane and the support mast is the same regardless of the height (position) of the connection, users such as workers do not need to adjust the length of the second connecting member, and there is no risk of misidentification such as using members of different lengths when working at heights, thus improving safety and productivity.

[0038] In this embodiment example 1, when the tower 5 is assembled and the support mast 1 is to be dismantled and removed, for example, a pulley is attached to the tower 5, and the dismantled mast 11 is lowered to the ground using the pulley, wire, winch, etc.

[0039] <Example 1> The support mast 1 may be configured to have, for example, a ladder or elevator (not shown) on its outside. This would reduce the effort required for users, such as workers, to ascend or descend the support mast 1, which would be convenient.

[0040] <Example of Embodiment 2> In the above Embodiment Example 1, a configuration for crane system A was shown in which a mast 11 is added to the top of the support mast 1 to raise it up. However, the configuration is not limited to this. In Embodiment Example 2, as shown in Figure 5, a configuration for crane system B is described in which a mast 11 is added to the bottom of the support mast 1 to raise it up. In the following, only the differences from Embodiment Example 1 will be described, and other configurations are the same as in Embodiment Example 1, so their description will be omitted.

[0041] As shown in Figure 6, bearings 64 are provided at each of the four inner corners of the annular member 63 (an example of the first annular member) related to the first connecting member 6. Note that Figure 6 is an explanatory diagram showing a cross-section from the planar direction (the "DD line" in Figure 5). Therefore, when the annular member 63 is provided on the outer circumference of the support mast 1, bearings 64 are interposed between the annular member 63 and the support mast 1. As a result, even if the annular member 63 is already provided on the outer circumference of the support mast 1 at an appropriate position, the support mast 1 can slide inside the annular member 63, and the mast 11 can be extended to the bottom and raised.

[0042] Furthermore, as shown in Figures 5 and 6, the annular member 63 is connected to the tower 5 using, for example, a first connecting member 6 which is a metal wire. Specifically, one end of each first connecting member 6 is connected to the annular member 63. The other end of each first connecting member 6 is connected to one of the main column members 51 provided on the four sides of the tower 5. In other words, the annular member 63 is connected to each of the main column members 51 provided on the four sides of the tower by four first connecting members 6. As described above, since the annular member 63 is provided on the outer circumference of the support mast 1 via bearings 64, it is fixed to the tower 5 (main column members 51) by the first connecting members 6 in order to fix the position of the annular member 63. Note that in the lower parts of the tower 5, the spacing between the main column members 51 of the tower 5 is wide, and the annular member 63 may slide down due to its own weight if it is only connected to the four first connecting members 6 which are connected to each of the main column members 51. In that case, the annular member 63 may be further suspended by a metal wire or the like (not shown in the illustration).

[0043] Furthermore, as shown in Figure 7, bearings 74 are provided at each of the four inner corners of the annular member 73 (an example of the second annular member) related to the second connecting member 7. Note that Figure 7 is an explanatory diagram showing a cross-section from the planar direction (the "EE line" in Figure 5). Therefore, when the annular member 73 is provided on the outer circumference of the support mast 1, bearings 74 are interposed between the annular member 73 and the support mast 1. As a result, even if the annular member 73 is already provided on the outer circumference of the support mast 1 at an appropriate position, the support mast 1 can slide inside the annular member 73, and the mast 11 can be extended to the bottom and raised. Note that the annular member 73 and the annular member 63 described above are functionally the same.

[0044] Furthermore, as shown in Figures 5 and 7, the annular member 73 is connected to the tower 5 using, for example, a third connecting member 75 which is a metal wire. Specifically, one end of each third connecting member 75 is connected to the annular member 73. The other end of each third connecting member 75 is connected to one of the main column members 51 provided on the four sides of the tower 5. In other words, the annular member 73 is connected to each of the main column members 51 provided on the four sides of the tower by four third connecting members 75. As described above, since the annular member 73 is provided on the outer circumference of the support mast 1 via a bearing 74, it is fixed to the tower 5 (main column member 51) by the third connecting member 75 in order to fix the position of the annular member 73. Furthermore, at lower sections of the transmission tower 5, the spacing between the main column members 51 of the transmission tower 5 is wide, and the four third connecting members 75 connected to each of the main column members 51 alone may cause the annular member 73 to slide down due to its own weight. In such cases, the annular member 73 may be further suspended by a metal wire or the like (not shown).

[0045] <Construction flow of tower 5 using crane system B> The workers and other users are adding mast 11 to the bottom of tower 5 and raising it up in order to construct support mast 1 approximately in the center of the inside of tower 5.

[0046] Then, for example, when the number of added masts 11 reaches seven, the support mast 1 is connected to the tower 5 using the first connecting member 6. More specifically, as shown in Figure 6, a user such as a worker connects the other end of the first connecting member 6 to one of the main column members 51 provided on the four sides of the tower 5, and then, while holding the annular member 63 on the outer circumference of the support mast 1, connects one end of the first connecting member 6 to the annular member 63. This operation of connecting the first connecting member 6 to the annular member 63 is performed from all directions of the tower 5, so that the annular member 63 provided on the outer circumference of the support mast 1 is supported from all four sides by the first connecting member 6.

[0047] Next, the users, such as workers, erect one mast 32 outside the construction area of ​​the tower 5 in order to attach the crane 3 to the tower 5. They then add another mast 32 to the top of that mast, and then add yet another mast 32 to the top of that mast. Finally, they raise the crane body 31 and position it on top of the three added masts 32.

[0048] Then, the user, such as a worker, connects the crane 3 to the support mast 1 using the second connecting member 7. More specifically, as shown in Figure 7, the user, such as a worker, connects the other end of the third connecting member 75 to one of the main column members 51 provided on all four sides of the tower 5, and then, while holding the annular member 73 on the outer circumference of the support mast 1, connects one end of the third connecting member 75 to the annular member 73. This operation of connecting the third connecting member 75 to the annular member 73 is performed from all directions of the tower 5, so that the annular member 73 provided on the outer circumference of the support mast 1 is supported from all four sides by the third connecting member 75. Then, as shown in Figure 5, the second mast 32 from the bottom of the crane 3 is connected to the sixth mast 11 from the bottom of the support mast 1, which corresponds to it in the horizontal direction, using the second connecting member 7.

[0049] As described above, the following steps are repeated according to the assembly status of tower 5: "extend mast 11 → connect support mast 1 to tower 5 → extend mast 32 → connect crane 3 to support mast 1".

[0050] <Modification 2> In this embodiment example 2, the support mast 1 may also be configured to include a ladder, elevator, or other lifting equipment (not shown). In that case, the lifting equipment is installed inside the support mast 1, for example, so as not to collide with the sliding mast 11, on the inside of the annular members 63 and 73. Alternatively, it can be installed by connecting it to the outer surface of a plurality of annular members 63 and 73 that are spaced apart on the outer circumference of the support mast 1.

[0051] <Example of Embodiment 3> In the above embodiment example 1, a configuration was shown in which a rectangular annular member 61 relating to the first connecting member 6 that connects the steel tower 5 and the support mast 1, and a rectangular annular member 71 relating to the second connecting member 7 that connects the crane 3 and the support mast 1 are provided separately. In the above embodiment example 2, a configuration was shown in which a rectangular annular member 63 relating to the first connecting member 6 that connects the steel tower 5 and the support mast 1, and a rectangular annular member 73 relating to the second connecting member 7 that connects the crane 3 and the support mast 1 are provided separately.

[0052] On the other hand, in this embodiment example 3, as shown in Figures 8 and 9, the configuration of the crane system C will be described in which a rectangular annular member related to the first connecting member 6 that connects the tower 5 and the support mast 1 and a rectangular annular member related to the second connecting member 7 that connects the crane 3 and the support mast 1 are used in common. In the following, only the differences from embodiments 1 and 2 will be described, and the other configurations are the same as in embodiments 1 and 2, so the description will be omitted. Also, Figure 9 is an explanatory diagram showing a cross-section from the planar direction (the "FF line" in Figure 8).

[0053] As shown in Figure 8, multiple annular members 81 (an example of the first annular members) are provided on the outer circumference of the support mast 1 at appropriate positions (two in Figure 8). As shown in Figures 8 and 9, each first connecting member 6 is connected to the support mast 1 by having one end connected to this annular member 81. The other end of each first connecting member 6 is connected to one of the main column members 51 provided on all four sides of the tower 5. Therefore, the support mast 1 and the tower 5 are connected by the annular members 81 and four first connecting members 6, one end of which is connected to the annular member 81 and the other end of which is connected to one of the main column members 51 provided on all four sides of the tower 5.

[0054] Furthermore, one end of the second connecting member 7, which is a rigid body such as an H-shaped steel beam and connects the mast 32 of the crane 3 to the support mast 1, is connected to an annular member 81 provided on the outer circumference of the support mast 1 at an appropriate position, and the other end of the second connecting member 7 is connected to an annular member 71 provided on the outer circumference of the mast 32 of the crane 3 at an appropriate position.

[0055] In other words, the annular members 81 provided on the outer circumference of the support mast 1 at appropriate positions are used in common for connecting the support mast 1 to the tower 5 and for connecting the support mast 1 to the crane 3.

[0056] Thus, in the crane system C according to this embodiment example 3, the annular member 81 is used in common for both the connection between the support mast 1 and the steel tower 5, and the connection between the support mast 1 and the crane 3. As a result, the number of members and materials used is reduced, and the labor of users such as workers is also reduced, making it convenient.

[0057] <Variation 3> In this modified example 3, based on the above embodiment example 3, the configuration of the crane system D is described in which a mast 11 is added to the bottom of the support mast 1 and raised. In the following, only the differences from embodiment example 3 will be described, and other configurations are the same as in embodiment example 3, so their explanation will be omitted.

[0058] As shown in Figure 10, bearings 84 are provided at each of the four inner corners of the annular member 83. Figure 10 is an explanatory diagram showing a cross-section from the planar direction (the "FF line" in Figure 8). Therefore, when the annular member 83 is provided on the outer circumference of the support mast 1, the bearings 84 are interposed between the annular member 83 and the support mast 1. As a result, even if the annular member 83 is already provided on the outer circumference of the support mast 1 at an appropriate position, the support mast 1 can slide inside the annular member 83, and the mast 11 can be added to the bottom and raised.

[0059] <Modification 4> In the above-described embodiments 1 to 3 and their modified examples 1 to 3, the support mast 1 is rectangular in shape, so the members 61, 71, 63, 73, 81, and 83 provided on its outer circumference are also rectangular annular members. However, the configuration is not limited to this. For example, if the support mast 1 is cylindrical, then the members 61, etc., provided on its outer circumference can be annular members. In short, the shape of the members 61, etc., is sufficient as long as it can be provided on the outer circumference of the support mast 1. Furthermore, the inner circumference of the members 61, etc., that are joined to the outer circumference of the support mast 1 may be configured to match the outer circumference of the support mast 1. For example, a rectangular or circular through-hole can be provided in the center of the member 61, etc., to match the outer circumference of the support mast 1. The outer circumference of the member is not limited to the shape of the through-hole.

[0060] Similarly, since the mast 32 of the crane 3 is prism-shaped, the member 71 provided on its outer circumference is also an annular member. However, the configuration is not limited to this. For example, if the mast 32 is cylindrical, the member 71 provided on its outer circumference can be an annular member. In short, the shape of the member 71 can be any configuration that allows it to be provided on the outer circumference of the mast 32.

[0061] Furthermore, members 61, 71, 63, 73, 81, 83, and 71 have configurations that allow them to be attached to the outer circumference of the support mast 1, for example, as belts that can be fastened to the outer circumference of the support mast 1, or as split pieces that can be fitted onto the outer circumference of the support mast 1.

[0062] <Modification 5> Furthermore, in the above-described embodiments 1 to 3 and their modified examples 1 to 3, the configuration is shown in which the other end of the first connecting member 61 is connected to one of the main column members 51 provided on all four sides of the tower 5, but the configuration is not limited to this. For example, the other end of some of the multiple first connecting members 6 may be connected to one of the main column members 51 provided on all four sides of the tower 5, and the other end of the remaining members 6 may be connected to members other than the main column members of the tower 5, such as bracing members (diagonal members).

[0063] <Variation 6> Furthermore, while the above-described embodiments 1 to 3 and their modifications 1 to 3 show a configuration in which the present invention is applied to a square tower 5 with main column members 51 on all four sides, the present invention is not limited to this configuration. For example, it is also possible to apply the present invention to a triangular tower 5 with main column members on three sides.

[0064] Therefore, in the above embodiments 1 to 3 and their modified examples 1 to 3, the other ends of each first connecting member 6 and each third connecting member 75 are shown to be connected to any of the main column members 51 provided on all four sides of the tower 5. However, in the case of a triangular tower, the other ends of each first connecting member 6 and the third connecting member 75 are connected to any of the main column members provided on three sides of the tower. [Explanation of symbols]

[0065] A: Crane system, B: Crane system, C: Crane system, D: Crane system 1: Support mast, 11: Mast, 3: Crane, 31: Crane body, 311: Slewing body, 312: Jib, 313: Hoisting rope, 314: Hook, 32: Mast, 5: Steel tower, 51: Main column material, 6: First connecting member, 61: Member, 63: Member, 64: Bearing, 7: Second connecting member, 71: Member, 73: Member, 74: Bearing, 75: Third connecting member, 81: Components, 83: Components, 84: Bearings

Claims

1. A crane system for constructing steel towers, The crane system is equipped with a support mast and a crane for tower construction. The aforementioned support mast is installed approximately in the center of the inside of the tower. The crane is installed outside the construction area of ​​the tower. The support mast and the tower are connected using a plurality of first connecting members. Each of the first connecting members connects the support mast to one of the main column members provided on the tower. A crane system characterized in that the crane and the support mast are connected using a second connecting member.

2. One end of the first connecting member is connected to a first annular member provided on the outer circumference of the support mast, and the other end of the first connecting member is connected to one of the main column members provided on the tower. The crane system according to claim 1, characterized in that one end of the second connecting member is connected to an annular member provided on the outer circumference of the mast of the crane, and the other end of the second connecting member is connected to a second annular member provided on the outer circumference of the support mast.

3. One end of the first connecting member is connected to a first annular member provided on the outer circumference of the support mast, and the other end of the first connecting member is connected to one of the main column members provided on the tower. The crane system according to claim 1, characterized in that one end of the second connecting member is connected to an annular member provided on the outer circumference of the mast of the crane, and the other end of the second connecting member is connected to the first annular member provided on the outer circumference of the support mast.

4. A method for constructing a steel tower using a crane system for steel tower construction, The crane system is equipped with a support mast and a crane for tower construction. The support mast is installed approximately in the center of the inside of the transmission tower. The crane is installed outside the construction area of ​​the aforementioned tower. By using multiple first connecting members, the support mast is connected to one of the main column members provided on the tower, thereby connecting it to the tower. A method for constructing a steel tower, characterized by connecting the crane and the support mast using a second connecting member.

5. The connection between the support mast and the tower using the first connecting member is made by connecting one end of the first connecting member to a first annular member provided on the outer circumference of the support mast, and connecting the other end of the first connecting member to one of the main column members provided on the tower. The method for constructing a steel tower according to claim 4, characterized in that the connection between the crane and the support mast using the second connecting member is made by connecting one end of the second connecting member to an annular member provided on the outer circumference of the mast of the crane, and connecting the other end of the second connecting member to a second annular member provided on the outer circumference of the support mast.

6. The connection between the support mast and the tower using the first connecting member is made by connecting one end of the first connecting member to a first annular member provided on the outer circumference of the support mast, and connecting the other end of the first connecting member to one of the main column members provided on the tower. The method for constructing a steel tower according to claim 4, characterized in that the connection between the crane and the support mast using the second connecting member is made by connecting one end of the second connecting member to an annular member provided on the outer circumference of the mast of the crane, and connecting the other end of the second connecting member to the first annular member provided on the outer circumference of the support mast.

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