Method for constructing tower-like structures

Abstract

To provide a construction method of a tower structure by which the tower structure can be constructed in a small work yard.SOLUTION: The construction method of a tower structure includes the steps of: constructing the lower part of a wind power generator 10 using a mobile crane 20 when constructing the wind power generator 10, which is an example of a tower structure; lifting the mobile crane 20 using a lifting device 30; and constructing the upper part of the wind power generator 10 using the lifted mobile crane 20.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for constructing a tower structure such as a wind turbine.

Background Art

[0002] In recent years, in order to improve and stabilize the power generation amount, the enlargement of wind turbines has been progressing. When constructing such large wind turbines, since it is necessary to lift members to a higher position, it is preferable to use a large mobile crane. However, depending on the road conditions, a large mobile crane may not be able to drive itself to the construction site. In relation to this, Patent Document 1 discloses a method using three or more guide towers installed around the foundation of a wind turbine as a method for constructing a large wind turbine using a relatively small mobile crane.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the method of Patent Document 1, since guide towers must be installed around the wind turbine, a large work yard is required. Note that such problems are common not only in wind turbines but also when constructing tower structures such as chimneys.

Means for Solving the Problems

[0005] The method for constructing a tower structure for solving the above problems is a method for constructing a tower structure using a mobile crane, and includes a step of lifting the mobile crane with a lifting device and a step of performing a lifting operation with the lifted mobile crane.

Effects of the Invention

[0006] According to the present invention, tower-like structures can be constructed in a small work yard. [Brief explanation of the drawing]

[0007] [Figure 1] This diagram shows a schematic configuration of one embodiment of a method for constructing a tower-like structure, as viewed from the side of a mobile crane. [Figure 2] This diagram shows a schematic configuration of one embodiment of a method for constructing a tower-like structure, as viewed from the front of a mobile crane. [Figure 3] This is a perspective view showing an example of a leg component. [Figure 4] (a) A diagram showing the newly installed leg members placed on the mounting base; (b) A diagram showing the leg members constituting the support legs in a lifted state; (c) A diagram showing the newly installed leg members placed in the leg member installation space; (d) A diagram showing the newly installed leg members incorporated into the support legs. [Figure 5] This diagram shows the mobile crane as viewed from the side, with the support legs connected by connecting members. [Figure 6] This diagram shows a mobile crane equipped with a counterweight device, viewed from the side. [Figure 7] This diagram shows a mobile crane supported via a frame, viewed from the side. [Modes for carrying out the invention]

[0008] An embodiment of a method for constructing a tower-like structure will be described with reference to Figures 1 to 7. As shown in Figures 1 and 2, a wind turbine 10, which is an example of a tower-like structure, is constructed using a mobile crane 20. The mobile crane 20 is, for example, a truck crane with a crane device 22 mounted on a truck chassis 21. The mobile crane 20 only needs to be self-propelled and may be a crawler crane or a wheel crane. The mobile crane 20 travels to the construction site of the wind turbine 10 and then performs various operations such as lifting components.

[0009] Upon arriving at the construction site, the mobile crane 20 stops at a position where it can be raised by the lifting device 30. Specifically, the mobile crane 20 stops at a position where each outrigger 23 can be supported by the lifting device 30. The construction site may also be provided with a ramp or similar structure to allow each outrigger 23 to be supported by the lifting device 30.

[0010] The lifting device 30 forms support legs 31 that support the mobile crane 20. The support legs 31 are provided to correspond to each of the outriggers 23 of the mobile crane 20. The lifting device 30 lifts the mobile crane 20 by extending the support legs 31 in accordance with the progress of the wind turbine 10.

[0011] The method for constructing the wind turbine 10 includes the steps of constructing the lower part of the wind turbine 10 using a mobile crane 20, raising the mobile crane 20 with a lifting device 30, and constructing the upper part of the wind turbine 10 using the mobile crane 20 raised by the lifting device 30. Furthermore, the above steps are repeated depending on the size of the wind turbine 10.

[0012] The lifting device 30 has a jack mechanism 32 that supports each support leg 31. Each support leg 31 is composed of multiple leg members 33. The jack mechanism 32 is installed so as to be located below at least each outrigger 23. The drive method for the jack mechanism 32 is, for example, hydraulic. The jack mechanism 32 is preferably fixed to the ground with anchor bolts or the like.

[0013] The jack mechanism 32 has a movable frame 35 and a jack 36. The movable frame 35 has a rectangular frame shape when viewed from above. The movable frame 35 is provided with engaging claws (not shown) that are configured to move back and forth in the inward and outward directions and to engage with the leg members 33. The jack 36 is provided so as to correspond to each corner of the movable frame 35 when viewed from above. The jack 36 moves the movable frame 35 upward by extending and moves the movable frame 35 downward by contracting.

[0014] As shown in Figure 3, the leg members 33 are formed in a roughly rectangular parallelepiped shape using materials such as steel or concrete blocks. Furthermore, the leg members 33 are formed in a shape that allows them to fit together with the leg members 33 located above and below them.

[0015] The leg member 33 has an insertion hole 40. The insertion hole 40 is a hole used when moving the leg member 33, for example, a hole into which the forks of a forklift are inserted. The leg member 33 has an engagement hole 41. The engagement hole 41 is a hole into which the engagement claws provided on the movable frame portion 35 of the jack mechanism 32 can engage. The leg member 33 has an upper connecting portion 42 and a side connecting portion 43 as connecting portions used for connecting with other members.

[0016] The operation of the lifting device 30 will be explained with reference to Figure 4. As shown in Fig. 4(a), when the leg member 33 at the lowest position of the support leg 31 and the movable frame portion 35 of the jack mechanism 32 are in an engaged state, the lifting device 30 lifts the support leg 31 by extending the jack portion 36. As a result, as shown in Fig. 4(b), a leg member installation space where a newly installed leg member 33a can be arranged is formed directly below the support leg 31. Further, the newly installed leg member 33a is arranged on the installation table 45 using a forklift or the like. The installation table 45 is a pedestal on which the newly installed leg member 33a is installed. The installation table 45 extends to the side of the movable frame portion 35 and is configured to be slidable to the leg member installation space with the leg member 33 arranged at the end.

[0017] Next, as shown in Fig. 4(c), after sliding the newly installed leg member 33a to the leg member installation space, the jack portion 36 is contracted. As a result, as shown in Fig. 4(d), the support leg 31 is placed on the newly installed leg member 33a. Then, by engaging the engaging claw of the jack mechanism 32 with the engaging hole 41 of the newly installed leg member 33a, the newly installed leg member 33a is added as a leg member constituting the support leg 31.

[0018] The lifting device 30 repeats the extension of the jack mechanism 32, the arrangement of the newly installed leg member 33a, the contraction of the jack mechanism 32, and the change of the engagement target of the jack mechanism 32, and adds the leg member 33 to the lower end of the support leg 31 to lift the mobile crane 20.

[0019] As shown in Fig. 5, the lifting device 30 may be configured such that a connecting member for connecting the support legs 31 to each other using the side connection portion 43 such as the beam 50 and the cross brace 51 is installed. The connecting member is preferably connected to each support leg 31 after being lifted by the mobile crane 20.

[0020] Furthermore, as shown in Figure 6, the mobile crane 20 may be provided with a detachable counterweight device 55. Preferably, the counterweight device 55 is connected to and supported by the truck chassis 21 of the mobile crane 20, and the weight 56 ​​is lifted by the crane device 22 of the mobile crane 20. The counterweight device 55 is provided on the side of the mobile crane 20 opposite the wind turbine 10 to balance the weight when lifting the components of the wind turbine 10.

[0021] The crane device 22 may be operated from the operator's seat of the raised mobile crane 20, or it may be operated from the ground using a remote controller. If operation is performed from the operator's seat, a means of movement such as a ladder is connected to a column member formed in the same manner as the support legs 31, so that the operator can access the operator's seat.

[0022] Furthermore, as shown in Figure 7, the lifting device 30 may support the mobile crane 20 via a frame 60 supported by the support legs 31. With this configuration, support legs 31a other than the support legs 31 corresponding to the outriggers 23 can also be installed. In addition, if the lifting device 30 has a frame 60 and the crane device 22 is operated from the operator's seat, it is possible to connect access means such as ladders to the support legs 31.

[0023] The operation and effects of this embodiment will now be described. (1) By raising the mobile crane 20 with the lifting device 30, a large wind turbine 10 can be constructed using a small mobile crane 20 without having to set up a large work yard.

[0024] (2) In the lifting device 30, support legs 31 are provided to correspond to each of the outriggers 23 of the mobile crane 20. This makes it possible to stabilize the support of the mobile crane 20 by the lifting device 30.

[0025] (3) The support legs 31 are connected to each other by connecting members such as beams 50 and braces 51, thereby stabilizing the support of the mobile crane 20 by the lifting device 30. (4) By providing the mobile crane 20 with a counterweight device 55, the posture of the mobile crane 20 can be stabilized when lifting various components.

[0026] (5) By supporting the mobile crane 20 via the frame 60, support legs other than the support legs 31 corresponding to the outriggers 23 can be installed. This allows the forces acting on each support leg to be distributed. In addition, means of accessing the operator's seat of the mobile crane 20 can be provided on the support legs 31.

[0027] This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically. The lifting device 30 does not necessarily need to have connecting members that connect the multiple support legs 31 to each other. This allows for a reduction in construction time.

[0028] If the lifting device 30 has a frame 60, it may have support legs 31 on the inside or outside of the outriggers 23 when viewed from above. The lifting device 30 only needs to be capable of lifting the mobile crane 20. Therefore, the lifting device 30 is not limited to having a jack mechanism 32 composed of a movable frame 35 and a jack section 36. For example, the lifting device 30 may consist of an extendable hydraulic jack and support legs 31 supported by the hydraulic jack, or it may be configured to lift the mobile crane 20 using PC steel wire or rods.

[0029] The technical concepts that can be understood from the above embodiments and modified examples are described below. (Note 1) A counterweight device is installed on the mobile crane. This allows the mobile crane's posture to be stabilized when lifting various components.

[0030] (Note 2) The lifting device supports the mobile crane via a frame supported by support legs. This allows for the installation of support legs other than those corresponding to the outriggers, thereby distributing the forces acting on each support leg. Furthermore, means of accessing the mobile crane's operator's seat can be provided on the support legs. [Explanation of Symbols]

[0031] 10...wind turbine, 20...mobile crane, 21...truck chassis, 22...crane device, 23...outrigger, 30...lifting device, 31,31a...support legs, 32...jack mechanism, 33,33a...leg material, 35...movable frame section, 36...jack section, 40...insertion hole, 41...engagement hole, 42...top connecting section, 43...side connecting section, 45...mounting base, 50...beam, 51...bracing, 55...counterweight device, 56...weight, 60...frame.

Claims

1. A method for constructing a tower-like structure using a mobile crane, The process of raising the mobile crane using a lifting device, The process includes a step of performing lifting work with the raised mobile crane, The aforementioned lifting device is Multiple support legs are provided to correspond to each of the outriggers of the mobile crane, and the support legs are configured to be extendable by inserting new leg members under the support legs while the mobile crane is being supported. The process further includes the step of the mobile crane traveling under its own power to the construction site of the tower-like structure, and then stopping at a position where each of the outriggers is positioned above the support legs. Method for constructing tower-like structures.

2. The mobile crane performs the lifting operation with each of the outriggers directly supported by the support legs. A method for constructing a tower-like structure according to claim 1.

3. The lifting device has a frame supported by the plurality of support legs, The mobile crane performs the lifting operation with the outriggers supported on the frame. A method for constructing a tower-like structure according to claim 1.

4. Further comprising the step of connecting the plurality of support legs to one another A method for constructing a tower-like structure according to any one of claims 1 to 3.

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