JP2024011580A - Construction method of tower structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: 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

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a method for constructing a tower-like structure such as a wind power generator.

In recent years, wind power generators have become larger in order to improve and stabilize the amount of power generated. When constructing such a large wind power generator, it is necessary to lift components to a higher position, so it is preferable to use a large mobile crane. However, depending on road conditions, it is not always possible for large mobile cranes to drive to the construction site by themselves. In this regard, Patent Document 1 describes a method of constructing a large wind power generator using a relatively small mobile crane, using three or more guide towers installed around the foundation of the wind power generator. A method is disclosed.

Japanese Patent Application Publication No. 2013-256852

However, the method of Patent Document 1 requires a large work yard because a guide tower must be installed around the wind power generator. Note that these problems are not limited to wind power generators, but are common when constructing tower-like structures such as chimneys, for example.

A method for constructing a tower-like structure that solves the above problems is a method for constructing a tower-like structure using a mobile crane, which includes a step of raising the mobile crane with a lifting device, and a step of raising the mobile crane using a lifting device. A process of performing lifting work with a mobile crane.

According to the invention, a tower-like structure can be constructed in a small working yard.

1 is a diagram illustrating a schematic configuration of an embodiment of a method for constructing a tower-like structure when viewed from a side direction of a mobile crane. 1 is a diagram illustrating a schematic configuration of an embodiment of a method for constructing a tower-like structure when viewed from the front direction of a mobile crane. It is a perspective view showing an example of a leg material. (a) A diagram showing a state in which newly installed leg members are placed on an installation base, (b) a diagram showing a state in which the leg members constituting the support leg are lifted, and (c) a diagram showing a state in which the leg members constituting the support leg are placed in the leg member installation space. It is a figure which shows the state where the newly installed leg material is arrange|positioned, and (d) is a figure which shows the state where the newly installed leg material is incorporated into the support leg. FIG. 3 is a diagram when the mobile crane is viewed from the side direction, with the support legs connected by the connecting members. FIG. 2 is a diagram showing a state in which the mobile crane is provided with a counterweight device, as viewed from the side of the mobile crane. FIG. 2 is a diagram showing a state in which the mobile crane is supported via a frame, as viewed from the side of the mobile crane.

An embodiment of a method for constructing a tower-like structure will be described with reference to FIGS. 1 to 7.
As shown in FIGS. 1 and 2, a wind power generator 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 in which a crane device 22 is 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. After the mobile crane 20 travels to the construction site of the wind power generator 10, it performs various operations such as lifting and lifting of members.

The mobile crane 20 that has arrived at the construction site stops at a position where it can be lifted up 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. Note that a parking platform or the like with a slope may be provided at the construction site so that each outrigger 23 can be supported by the raising device 30.

The lifting device 30 forms a support leg 31 that supports 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 according to the progress of the wind power generator 10.

The method for constructing the wind power generator 10 includes a step of constructing the lower part of the wind power generator 10 using a mobile crane 20, a step of raising the mobile crane 20 with a lifting device 30, and a step of lifting the mobile crane 20 with a lifting device 30. and a step of constructing the upper part of the wind power generator 10 using the raised mobile crane 20. Further, in the method of constructing the wind power generator 10, the above-described steps are repeated depending on the size of the wind power generator 10.

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

The jack mechanism 32 includes a movable frame portion 35 and a jack portion 36. The movable frame portion 35 has a square frame shape when viewed from above. The movable frame portion 35 is provided with an engaging pawl (not shown) that is configured to be movable forward and backward in the inside and outside directions and that can be engaged with the leg member 33. The jack portions 36 are provided so as to correspond to each corner of the movable frame portion 35 when viewed from above. The jack portion 36 moves the movable frame portion 35 upward by expanding, and moves the movable frame portion 35 downward by contracting.

As shown in FIG. 3, the leg member 33 is made of steel, concrete blocks, or the like and has an approximately rectangular parallelepiped shape. Further, the leg members 33 are formed in a shape that allows them to fit into each other with the leg members 33 located above and below.

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

The operation of the raising device 30 will be explained with reference to FIG. 4.
As shown in FIG. 4(a), the lifting device 30 lifts the jack part 36 when the leg member 33 at the lowest position of the support leg 31 and the movable frame part 35 of the jack mechanism 32 are in an engaged state. The support leg 31 is lifted by stretching it. Thereby, as shown in FIG. 4(b), a leg installation space is formed directly below the support leg 31 in which a newly installed leg 33a can be placed. Further, the newly installed leg member 33a is placed on the installation stand 45 using a forklift or the like. The installation base 45 is a base on which the newly installed leg member 33a is installed. The installation base 45 extends to the side of the movable frame portion 35, and is configured to be able to slide the leg members 33 disposed at the ends thereof to the leg member installation space.

Next, as shown in FIG. 4(c), after the newly installed leg member 33a is slid to the leg installation space, the jack portion 36 is retracted. Thereby, 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.

The lifting device 30 repeatedly extends the jack mechanism 32, places the newly installed leg member 33a, contracts the jack mechanism 32, and changes the engagement target of the jack mechanism 32, thereby attaching the leg member 33 to the lower end of the support leg 31. By adding more parts, the mobile crane 20 is lifted up.

As shown in FIG. 5, the raising device 30 may be configured to include a connecting member such as a beam 50 or a brace 51 that connects the support legs 31 to each other using a side connecting portion 43 or the like. It is preferable that the connecting member is connected to each support leg 31 after being lifted by the mobile crane 20.

Further, as shown in FIG. 6, the mobile crane 20 may be provided with a removable counterweight device 55. Preferably, the counterweight device 55 is connected to and supported by the truck chassis 21 of the mobile crane 20, and a weight 56 is lifted by the crane device 22 of the mobile crane 20. The counterweight device 55 is provided on the opposite side of the wind power generator 10 to the mobile crane 20 to balance the weight when lifting the components of the wind power generator 10.

Note that the crane device 22 may be operated in the operator's seat of the raised mobile crane 20, or may be operated on the ground using a remote controller. When maneuvering is performed in the cockpit, a means of transportation such as a ladder is connected to a column formed by the same method as the support legs 31, so that the pilot can access the cockpit. be done.

Further, as shown in FIG. 7, the lifting device 30 may support the mobile crane 20 via a pedestal 60 supported by the support legs 31. According to such a configuration, support legs 31a other than the support legs 31 corresponding to the outriggers 23 can also be installed. Further, when the lifting device 30 has a pedestal 60 and the crane device 22 is operated from a cockpit, it is possible to connect an access means such as a ladder to the support leg 31.

The operation and effects of this embodiment will be explained.
(1) Since the mobile crane 20 is raised by the lifting device 30, the large wind power generator 10 can be constructed using the small mobile crane 20 without setting up a large work yard.

(2) In the lifting device 30, support legs 31 are provided so as to correspond to each of the outriggers 23 of the mobile crane 20. Thereby, the support of the mobile crane 20 by the lifting device 30 can be stabilized.

(3) By connecting the supporting legs 31 to each other by connecting members such as the beam 50 and the brace 51, the support of the mobile crane 20 by the lifting device 30 can be stabilized.
(4) By providing the mobile crane 20 with the counterweight device 55, the posture of the mobile crane 20 can be stabilized when lifting various members.

(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 dispersed. Further, access means to the cockpit of the mobile crane 20 can be provided on the support leg 31.

This embodiment can be modified and implemented as follows. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
- The raising device 30 does not need to have a connecting member that connects the plurality of support legs 31 to each other. This makes it possible to shorten the construction period.

- When the raising device 30 has the pedestal 60, it may have the support legs 31 on the inside or outside of the outrigger 23 in a top view.
- The lifting device 30 may be any device that can lift the mobile crane 20. Therefore, the lifting device 30 is not limited to having the jack mechanism 32 configured with the movable frame portion 35 and the jack portion 36. For example, the hoisting device 30 may be configured with an extendable hydraulic jack and support legs 31 supported by the hydraulic jack, or may be configured to hoist the mobile crane 20 using a PC steel wire, a rod, or the like. There may be.

The technical ideas that can be understood from the above embodiment and modification examples will be described.
(Additional note 1)
A mobile crane is provided with a counterweight device. This makes it possible to stabilize the posture of the mobile crane when lifting various members.

(Additional note 2)
The lifting device supports the mobile crane via a pedestal supported by support legs. Thereby, support legs other than the support legs corresponding to the outriggers can be installed, so that the force acting on each support leg can be dispersed. Additionally, access means to the operator's seat of the mobile crane can be provided on the support leg.

DESCRIPTION OF SYMBOLS 10... Wind power generator, 20... Mobile crane, 21... Truck chassis, 22... Crane device, 23... Outrigger, 30... Lifting device, 31, 31a... Support leg, 32... Jack mechanism, 33, 33a... Leg material , 35... Movable frame part, 36... Jack part, 40... Insertion hole, 41... Engagement hole, 42... Top surface connection part, 43... Side connection part, 45... Installation stand, 50... Beam, 51... Bracing, 55 ... Counterweight device, 56... Weight, 60... Mount.

Claims (4)

A method for constructing a tower-like structure using a mobile crane, the method comprising:
a step of raising the mobile crane with a lifting device;
A method for constructing a tower-like structure, comprising the step of performing lifting work using the raised mobile crane. The lifting device has support legs that support the mobile crane, and is configured to be able to extend the support legs by inserting new leg members under the support legs. How to build a tower-like structure. The raising device has a plurality of the support legs,
The method for constructing a tower-like structure according to claim 2, wherein the support legs are provided so as to correspond to each outrigger of the mobile crane. The raising device has a plurality of the support legs,
The method for constructing a tower-like structure according to claim 2 or 3, further comprising the step of connecting the plurality of support legs to each other.

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