JP2007071097A - Construction method of wind power generation tower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of a wind power generation tower very superior in workability, safety and economic efficiency by constructing the enlarged wind power generation tower of about 40 to 120 m while wholly dispensing with a large crane and a large-scale temporary member by performing installation work of a wind power generator such as a nacelle and a rotor blade in a relatively low place of an aboveground part of about 20 m to 30 m. <P>SOLUTION: This wind power generation tower is constructed by a step of installing the wind power generator such as the nacelle 4 and the rotor blade 5 in a head part of an inside tower body 1 by fixing an outside tower body 2 to a foundation 3 by constructing the tower bodies 1 and 2 of two bodies slidably combined inside and outside in the vertical direction in a nesting system, and a step of binding a lower end part 11 of the inside tower body 1 to an upper end part 20a of the outside tower body 2 in the stage of reaching a rising limit by lifting the inside tower body 1 by taking reaction to the outside tower body 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention belongs to the technical field of a method for constructing a wind power tower, and more specifically, relates to a method for constructing a large-sized wind power tower having a height of about 40 m to 120 m.

  Wind power generation as an electrical energy source has been increasingly demanded by society as a clean energy source that does not emit gas that causes global warming and acid rain. In recent years, the strength of the wind increases as the altitude increases, and as a result, the amount of energy used increases. Therefore, there is a demand for an increase in the size (higher height) of the wind power generation tower.

  Conventionally, various technologies related to a method for constructing a wind power generation tower have been disclosed as in Patent Documents 1 to 3 described below.

  In Patent Document 1, a tower is constructed by stacking precast concrete members sequentially from the bottom upward, and then a wind turbine generator such as a nacelle (generator body) and a rotor blade is lifted by a large crane, and the top of the tower The technology to be installed in is disclosed.

  Patent Document 2 discloses a technique for constructing a wind power generation tower using a temporary lifting device without using a large crane.

  Patent Document 3 discloses a climbing device that is convenient for lifting and assembling block-structured tower structures and wind power generators such as nacelles and rotor blades using a small truck crane, and wind power using the climbing device. A technique for constructing a power generation tower is disclosed.

JP 2004-11210 A JP 2001-254668 A JP 2003-184730 A

In order to construct a large-sized wind power generation tower using the technique according to Patent Document 1, the following problems have occurred.
1) Since the nacelle installed at the top of the tower is heavy, a large crane is indispensable for lifting it to a height of about 40 m to 120 m. The number of such large cranes is very small, and there is a problem in that it requires a lot of labor and time for ground improvement work and ground reinforcement work for stably installing large cranes, resulting in poor economic efficiency. .
2) When installing the rotor blade on the nacelle with a large crane, if the wind was strong, the rotor blade was likely to be affected by the wind, so it took a lot of time or the work was often stopped. In particular, wind power generation towers are installed in high-wind areas such as mountainous areas and remote islands, and it is very difficult to lift rotor blades up to a height of about 40m to 120m and install them on nacelles in these high-wind areas. There was a problem that it was difficult and had a long period of work.
3) The use of a large crane not only increases the construction cost, but also has a problem that it is difficult to carry it to the construction site. In particular, there are many places where wind power generation towers are installed, such as mountainous areas and remote islands, which are inconvenient for traffic access, and this problem is remarkable.

  Although it can be noted that the technology according to Patent Document 2 can be implemented without using a large crane, it is not necessary to construct a large-scale wind power generation tower having a height of about 40 m to 120 m. There is a problem that a lifting device (temporary member) must be constructed, and the construction period is prolonged and the cost is enormous. In addition, the large lifting device has a problem in terms of the environment because it is dismantled and removed after building the wind power generation tower and becomes a large amount of construction waste.

  The technology according to Patent Document 3 is a technology that uses a small truck crane to lift and assemble block-structured tower structures and wind power generators such as nacelles and rotor blades. It is hard to recognize that this technology can be applied to the construction of a large-scale wind power tower having a height of about 120 m.

  The object of the present invention is to perform installation work of wind power generators such as nacelles and rotor blades in a relatively low place of about 20 m to 30 m above the ground, thereby eliminating the need for large cranes and large temporary members, yet 40 to 120 m It is an object of the present invention to provide a method for constructing a wind power generation tower that is capable of constructing a wind power generation tower that is large in size and that is extremely excellent in workability, safety, and economy.

As a means for solving the above-mentioned problem, the construction method of the wind power generation tower according to the invention described in claim 1 is, as shown in FIGS. Building the tower bodies 1 and 2 in a nested manner, fixing the outer tower body 2 to the foundation 3, and installing wind power generators such as nacelle 4 and rotor blades 5 on the head of the inner tower body 1;
The inner tower body 1 is raised against the outer tower body 2 by a reaction force, and the lower end portion 11 of the inner tower body 1 is moved to the upper end of the outer tower body 2 when reaching the rising limit. It is characterized by constructing a wind power generation tower by a step tightly coupled to the section 20a.

The construction method of the wind power generation tower according to the invention described in claim 2 is a method of nesting a plurality of tower bodies 30, 40, 50 that are slidable in the vertical direction and combined inside and outside, as shown in FIGS. 9 to 14. And fixing the outermost tower body 50 to the foundation 3 and installing wind power generators such as the nacelle 4 and the rotor blade 5 on the head of the innermost tower body 30;
The innermost tower 30 is lifted by a reaction force to the tower 40 adjacent to the outside, and when the upper limit is reached, the lower end 30a of the inner tower 30 is placed adjacent to the outside. The outer tower 40 is tightly coupled to the upper end 40b of the body 40, and then the outer tower 40 is further raised against the outer tower 50 by a reaction force. When the upper limit is reached, the lower end of the outer tower 40 is reached. 40a is further connected to the upper end 50b of the outer tower body 50, and the wind power generation tower is constructed by sequentially performing the steps of raising the tower body 40 adjacent to the inner side of the outermost tower body 50. To do.

  The invention described in claim 3 is the wind power generation tower construction method according to claim 1 or 2, wherein the means for raising the tower body 1 lifts up the tower body adjacent to the outside as a reaction force frame, Or it is characterized by pushing up.

  According to a fourth aspect of the present invention, in the wind power tower construction method according to any one of the first to third aspects, any one of the outer side surface of the rising tower body and the inner side surface of the tower body adjacent to the outer side of the tower body. One of them is provided with a guide in the vertical direction, and the other is provided with a rail that can slide along the guide in the vertical direction.

  The invention described in claim 5 is the wind power tower construction method according to any one of claims 1 to 4, wherein the balance control when raising the tower body is performed by a winch installed around the tower body. It is characterized by.

  The invention described in claim 6 is characterized in that, in the wind power generation tower construction method according to any one of claims 1 to 5, the tower body is constructed by stacking precast concrete members in the vertical direction.

  The invention described in claim 7 is the construction method of the wind power generation tower according to any one of claims 1 to 6, wherein the outer shape of the tower body is a cylindrical shape or a tapered shape, and the horizontal sectional shape is a circular shape. Or a polygonal shape.

  According to the construction method of the wind power tower according to the invention described in claims 1 to 7, because the tower body, which is a component of the wind power tower, is constructed in a nested manner that is slidable in the vertical direction and combined inside and outside, Installation of wind power generators such as nacelles and rotor blades can be performed in a relatively low place of about 20m to 30m above the ground, and yet a large wind power generation tower having a height of about 40m to 120m can be constructed. it can. Moreover, since the installation work of the wind power generator can be performed in a relatively low place of about 20 m to 30 m above the ground, a large crane and a large temporary member are not required at all, the construction period can be shortened, the workability and safety, It is very economical. Furthermore, since construction waste caused by temporary members and the like can be reduced as much as possible, the environment is excellent.

  In addition, when the wind power generation equipment needs to be replaced due to deterioration or the like, the process reverse to that at the time of construction is performed, and the replacement work of the wind power generation equipment is still smooth in a relatively low place of about 20 m to 30 m above the ground. Since it can be performed, a large crane and a large temporary member are not required, the construction period can be shortened, and the construction workability, safety, and economic efficiency are extremely excellent.

  The method for constructing a wind power generation tower according to the present invention is implemented as follows in order to achieve the effects of the above-described invention.

  1A to 1D show stepwise examples of a method for constructing a wind power tower according to the first aspect of the present invention.

  In the construction method of the wind power generation tower according to the first embodiment, two tower bodies 1 and 2 combined inside and outside so as to be slidable in the vertical direction are constructed in a nested manner (see FIG. 1B), and the outer tower body 2 is constructed. It fixes to the foundation 3 and wind power generators, such as a nacelle 4 and the rotor blade 5, are installed in the head of the inner tower 1 (refer FIG. 1C). Next, the inner tower body 1 is raised against the outer tower body 2 by a reaction force, and when the upper limit is reached, the lower end portion 11 of the inner tower body 1 is moved to the outer tower body. The wind power generation tower is constructed by being tightly coupled to the upper end portion 20a of the second (invention of claim 1).

  Specifically, in the construction method of the wind power tower, first, as shown in FIG. 1A, the foundation 3 is constructed in a place suitable for installing the wind power tower in a strong wind zone such as a mountainous area or a remote island, On the foundation 3, the inner tower body (hereinafter referred to as a top tower as appropriate) 1 is constructed.

  The top tower 1 includes a plurality of cylindrical precast concrete members (hereinafter referred to as PCa members) 10 each having a height of 3.0 m, an outer diameter of 2.5 m, and a weight of about 150 kN manufactured at a factory near the site. The body (seven in the illustrated example) is prepared, and is constructed by stacking in the vertical direction using a truck crane of about 1200 kN class (the invention according to claim 6).

  Various methods of joining the PCa members 10 are conceivable. In the first embodiment, a lap joint method (a method of joining the reinforcing bars 10a in the vertical direction) as shown in FIGS. 2A and 2B is adopted. The gap between the PCa member 10 and the reinforcing bar 10a is filled with a grout material (not shown) such as high-strength mortar. A base member 11 (outer diameter: 3.06 m) made of concrete for lift-up is attached in a concentric arrangement to the lower end of the PCa member 10 positioned at the lowest position of the top tower 1. . The base member 11 has an effect of evenly distributing the load during lift-up. In addition, although the said base member 11 is implemented in the disk shape which obstruct | occludes the lower end part of the said top tower 1, it is not limited to this, It is provided in the ring shape along the outer side of the lower end part of the said top tower 1. You may implement.

  The top tower 1 constructed as described above has a height of about 20 m and is temporarily fixed to the foundation 3 using a temporary fixing member (not shown) such as an anchor bolt.

  In addition, although the said top tower 1 (PCa member 10) is implemented by the size cylinder shape, it can also be implemented by the taper shape of a taper gradually toward upper direction. Moreover, although the horizontal cross-sectional shape is implemented in a circular shape, it can also be implemented in a polygonal shape (the invention according to claim 7).

  Next, as shown in FIG. 1B and FIG. 3, the outer tower body (hereinafter referred to as a bottom tower as appropriate) 2 is viewed from the plane direction in a form surrounding the inner tower body (top tower) 1. Then, it is constructed in a concentric arrangement along the outer peripheral surface of the base member 11.

  The bottom tower 2 is provided with a plurality (8 in the illustrated example) of cylindrical PCa members 20 each having a height of 2.5 m, an outer diameter of 3.8 m, and a weight of about 150 kN manufactured at a factory near the site. A truck crane of about 1200 kN class is used and stacked in the vertical direction by the lap joint method. Further, the lower end portion of the PCa member 20 positioned at the lowest position of the bottom tower 2 (having a height of about 20 m) is fastened and fixed to the foundation 3 by a so-called PC crimping method. Further, at the upper end portion of the PCa member 20 positioned at the uppermost position of the bottom tower 2, a protruding portion (frame) 20 a for installing the lift-up hydraulic jack 6 is provided at substantially equal intervals on the inner peripheral surface thereof. Three places are provided in good balance. The protruding portion 20a according to the first embodiment is integrally formed with the PCa member 20 in advance and has a horizontal length enough to reach the outer peripheral surface of the top tower 1. The protrusions 20a are not limited to three locations, and can be provided with a good balance in four or more locations, or provided in a ring shape over the entire inner peripheral surface of the PCa member 20. You can also

  Thus, the top tower 1 and the bottom tower 2 are constructed in a nesting manner in which the top tower 1 and the bottom tower 2 are slidable in the vertical direction, and the base member 11 provided at the lower end of the top tower 1, and the bottom tower 2. The projecting portion 20a provided at the upper end portion of the plate acts as a guide to restrain the horizontal displacement, and the top tower 1 can be raised in a stable state.

  Next, as shown in FIG. 1C, a required number (three in this embodiment) of lift-up hydraulic jacks (center hole jacks) 6 are installed on the upper surface of the protruding portion 20a of the bottom tower 2 in a balanced manner. . And each hydraulic jack 6 ... and the base member 11 of the top tower 1 to be lifted up are wire ropes suspended vertically between the outer peripheral surface of the top tower 1 and the inner peripheral surface of the bottom tower 2. , It is connected with a connecting material 7 for lifting such as a stranded wire and a rod of PC steel.

  The lifting connecting member 7 has its upper end fixed to the base member 11 by passing through the through-hole provided in the projecting portion 20 a and the hydraulic jack 6 and fixing the lower end to the base member 11. It passes through a through-hole provided in advance in the vertical direction and is fixed to the base member 11 using a latching member such as a fixing nut.

  Next, as shown in FIG. 1C, wind power generators such as a nacelle 4 and a rotor blade 5 are installed on the head of the top tower 1 using a crane (not shown).

  According to the first embodiment, it is usually sufficient to lift a heavy wind power generation apparatus having a heavy weight exceeding 1000 kN to the height of the top tower 1, that is, about 20 m. Therefore, it is not necessary to use a large crane at all. Absent. Incidentally, the blade length per one of the rotor blades 5 is preferably about ½ of the height of the wind power tower to be constructed. In this embodiment, a blade having a length of 20 m is used. . When the rotor blade 5 is temporarily fixed in the state shown in FIG. 1C, the vertical height of the blade length is about 10 m (20 m × cos 60 °), and it is necessary to install at least 10 m above the ground. On the other hand, the height of the top tower 1 is about 20 m. Therefore, the rotor blade 5 can be safely installed without any trouble such as collision with the ground.

  Below, the process of raising the top tower 1 will be described.

  As shown in FIG. 1D, the top tower 1 and the bottom tower 2 constructed by installing the wind power generators such as the nacelle 4 and the rotor blade 5 in a nested manner are arranged so that the top tower 1 is the protruding portion of the bottom tower 2. The work of lifting up to a predetermined height is started using the hydraulic jack 6 installed on 20a (the invention according to claim 3).

  Here, the position of the center of gravity of the top tower 1 on which the wind turbine generator is installed does not coincide with the position of the center of gravity of the wind power generation tower to be constructed, and an eccentric load is generated during lift-up. In order to cancel the eccentric load and smoothly lift up, it is preferable for safety to use the balance wire 8 for balance control. The stay wire 8 is controlled using a winch 9 in conjunction with a hydraulic jack 6 for lift-up. Further, the winch 9 (stay wire 8) is installed from one place to a plurality of places as necessary (the invention according to claim 5).

  Thus, the hydraulic jack 6 on the protruding portion 20a is operated, and the top tower 1 is lifted by gradually moving the lift connecting member 7 and the base member 11 suspended and supported thereon (lift up). . The top tower 1 is gradually raised in a stable state by the base member 11 and the protruding portion 20a that act as a guide and restrains horizontal displacement, and the stay wire 8 and the winch 9 that perform balance control. Can do.

  Further, in order to raise the top tower 1 in a more stable state (especially with no rotation), as shown in FIG. 4, a guide having a U-shaped horizontal cross section is formed on the outer surface of the top tower 1. 1a is provided in the vertical direction, and a rail 2a that is slidable along the guide 1a on the inner surface of the bottom tower 2 is preferably provided in the vertical direction. Of course, the rail 2a may be provided on the outer side surface of the top tower 1 and the guide 1 may be provided on the inner side surface of the bottom tower 2. The horizontal cross-sectional shapes of the guide 1a and the rail 2a are not limited to the illustrated examples, and may be any shape that can raise the top tower 1 along the bottom tower 2 without rotation. Item 4).

  The lift-up operation by the hydraulic jack 6 is performed until the upper surface of the base member 11 of the top tower 1 comes into contact with the lower surface of the protruding portion 20a of the bottom tower 2. After the lift-up operation by the hydraulic jack 6 is finished, as shown in FIGS. 5A and 5B, the load of the top tower 1 is gradually changed from the hydraulic jack 6 to the binding steel member 12, and the top tower 1 Tightening work between the base member 11 and the protruding portion 20a of the bottom tower 2 is performed, and thus the construction work of the wind power generation tower having a height of about 40 m is completed.

  Specifically, in the tightening work according to the first embodiment, the projecting portion 20a and the vertical bolt hole previously drilled in the base member 11 are matched, and the high-strength bolt 12a is inserted into the bolt hole. The top tower 1 and the bottom tower 2 are fixed by tightening with a nut 12b, and if necessary, concrete is placed in a recess formed by the base member 11 on the bottom surface and the PCa member 20 on the side surface. Are structurally integrated. Incidentally, a part of the bolt hole provided in the projecting portion 20 a and the base member 11 is used as a through hole of the lifting connecting member 7.

  Of course, the fastening means is not limited to this, and any method can be used as long as the top tower 1 and the bottom tower 2 can be structurally integrated. For example, as shown in FIGS. 6A and 6B, concrete is applied to the binding rebar 13 composed of the vertical bars 13a embedded in both the base member 11 and the protrusions 20a and the horizontal bars 13b passing through the protrusions 20a. And the top tower 1 and the bottom tower 2 may be structurally integrated. Further, as shown in FIG. 7, an I-shaped steel (or H-shaped steel) 14 penetrating in the horizontal direction is provided in the projecting portion 20a, and a steel pipe 15 standing on the base member 11 is joined with welding and bolts. You may implement by integrating by a means. Further, as shown in FIG. 8, the base member 11 and the PCa member 20 are previously provided with bolt holes 16 that coincide when the upper surface of the base member 11 comes into contact with the lower surface of the protruding portion 20a of the bottom tower 2. It is drilled in the horizontal direction, and is fastened in such a manner that a steel material (not shown) is inserted into the bolt hole 16 and locked, and if necessary, the base member 11 on the bottom surface portion and the PCa member 20 on the side surface portion. The top tower 1 and the bottom tower 2 may be structurally integrated and carried out by placing concrete in the recess formed by.

  As described above, according to the first embodiment, the towers (the top tower 1 and the bottom tower 2), which are constituent elements of the wind power generation tower, are constructed in a nested manner that is slidable in the vertical direction and combined inside and outside. Therefore, the installation work of the wind power generators such as the nacelle 4 and the rotor blade 5 can be performed in a relatively low place of about 20 m above the ground, and a wind power generation tower having a height of about 40 m can be constructed. Moreover, since the installation work of the wind power generator can be performed in a relatively low place of about 20 m above the ground, a large crane and a large temporary member are not required at all, the construction period can be shortened, workability, safety and economic efficiency. Very good. Furthermore, since construction waste caused by temporary members and the like can be reduced as much as possible, the environment is excellent.

  Further, when the wind power generation equipment needs to be replaced due to deterioration or the like, the reverse process of the construction is performed. That is, the tightening state between the base member 11 and the PCa member 20 is released and the top tower 1 is lowered until reaching the ground, and then the replacement work is performed. Therefore, since the replacement work of the wind power generation equipment can be performed at a relatively low place of about 20 m above the ground, a large crane and a large temporary member are not required, the construction period can be shortened, workability, safety, and economy. It is very excellent in sex.

  In the first embodiment, the top tower 1 is lifted by means of lifting up the reaction force on the upper end of the bottom tower 2. However, the present invention is not limited to this, and the bottom surface of the base member 11 is not limited thereto. A hydraulic jack can be installed on the outer peripheral edge of the bottom tower 2 and lifted by means of a push-up using a reaction force piece provided on the inner surface of the bottom tower 2 (invention according to claim 3). The top tower 1 and the bottom tower 2 are made of concrete. However, the material is not particularly limited as long as the tower can be constructed such as reinforced concrete, steel concrete, concrete filled steel pipe. Not. Furthermore, although the top tower 1 and the bottom tower 2 are implemented by so-called blind walls, it is of course possible to provide an opening. The same technical idea applies to Example 2 below.

  9A to 9C show step by step an embodiment of a method for constructing a wind power tower according to the invention described in claim 2. The construction method of the wind power generation tower according to claim 2 can be carried out by using a plurality of towers (specifically, three or more) that are constituent elements of the wind power generation tower as compared with claim 1 described above. Mainly different.

  That is, the construction method of the wind power generation tower according to the second embodiment is constructed by nesting a plurality of (three in this embodiment) tower bodies 30, 40, and 50 which are combined inside and outside so as to be slidable in the vertical direction ( 9A), the outermost tower body 50 is fixed to the foundation 3, and wind power generators such as the nacelle 4 and the rotor blade 5 are installed on the head of the innermost tower body 30 (see FIG. 9A). Next, the innermost tower body 30 is lifted by taking a reaction force against the tower body 40 adjacent to the outer side, and when the upper limit is reached, the lower end portion 30a of the inner tower body 30 is moved to the outer side. The outer tower 40 is fastened to the upper end 40b of the tower 40 adjacent to the outer tower 40, and then the outer tower 40 is raised against the outer tower 50 by a reaction force, and when the upper limit is reached, the outer tower 40 is reached. The wind power generation tower is constructed by sequentially performing the step of fastening the lower end portion 40a of 40 to the upper end portion 50b of the outer tower body 50 until the tower body 40 adjacent to the inner side of the outermost tower body 50 is raised. To do. In addition, in this Example 2, although it implements with three tower bodies, of course, it can also implement with four bodies or more. (Invention of Claim 2).

  Specifically, in the construction method of the wind power generation tower, first, as shown in FIG. 9A, the foundation 3 is constructed in a place suitable for installing the wind power generation tower in a high wind area such as a mountainous area or a remote island, On the foundation 3, the innermost tower body (hereinafter, referred to as a top tower as appropriate) 30 is constructed.

  The top tower 30 is prepared by a plurality of PCa members (10 in this embodiment) having a height of 3.0 m, an outer diameter of 2.5 m, and a weight of about 150 kN, which are manufactured at a factory near the site. It is constructed by stacking in the vertical direction using a truck crane of about 1200 kN class (invention of claim 6). Various methods of joining the PCa members are conceivable. In Example 2, as in Example 1 above, a lap joint method is adopted, and in the gap between the PCa member and the reinforcing bar, high strength mortar or the like is used. Filled with grout material. Further, as shown in FIG. 10A, a base member 30a (outer diameter of 3.06 m) is concentrically arranged at the lower end portion of the PCa member positioned at the lowest position of the top tower 30 as in the first embodiment. It is attached. In addition, although the said base member 30a is implemented in the disk shape which obstruct | occludes the lower end part of the said top tower 30, it is not limited to this, It is provided in the ring shape along the outer side of the lower end part of the said top tower 30. You may implement.

  The top tower 30 thus constructed has a height of about 30 m and is temporarily fixed to the foundation 3 using a temporary fixing member (not shown) such as an anchor bolt.

  Next, as shown in FIGS. 10A and 10B, an outer tower body (hereinafter, referred to as a middle tower as appropriate) 40 is seen from a plane direction in a form surrounding the innermost tower body (top tower) 30. Thus, the top tower 30 is constructed in a concentric arrangement along the outer peripheral surface of the base member 30a.

  The middle tower 40 is prepared by a plurality of cylindrical PCa members (10 in this embodiment) having a height of 3.0 m and an outer diameter of about 3.8 m, which are manufactured at a factory near the site. The truck crane is used, and is built up in the vertical direction by the lap joint method (invention of claim 5). Further, as shown in FIG. 10A, a ring-shaped base member 40a is attached to the lower end portion of the PCa member located at the lowest position of the middle tower 40 along the outer side thereof in a concentric arrangement. Further, as shown in FIG. 10A, the upper end portion of the PCa member 20 positioned at the uppermost position of the middle tower 40 has a hydraulic jack 6 for lifting up on its inner peripheral surface as shown in FIG. 10A. 3 are provided at almost equal intervals in a balanced manner (see also FIG. 3). The protrusion 40b is formed integrally with the PCa member in advance and has a horizontal length that reaches the outer peripheral surface of the top tower 30. In addition, the said protrusion part 40b is not limited to three places, It can also implement by providing four or more places, and can also be implemented by providing in the ring shape in the inner peripheral surface whole surface of a PCa member.

  The middle tower 40 constructed in this manner has a height of about 30 m and is temporarily fixed to the foundation 3 using a temporary fixing member (not shown) such as an anchor bolt.

  Next, as shown in FIGS. 10A and 10B, an outer tower body (hereinafter, referred to as a bottom tower as appropriate) 50 in a form surrounding the middle tower 40 is viewed from the plane direction. It is constructed in a concentric arrangement along the outer peripheral surface of the member 40a.

  The bottom tower 50 is prepared by a plurality of cylindrical PCa members (10 in this embodiment) having a height of 3.0 m and an outer diameter of about 5.1 m, which are manufactured at a factory near the site. The truck crane of the grade is used and stacked in the vertical direction by the lap joint method (invention of claim 6). Further, the lower end portion of the PCa member positioned at the lowest position of the bottom tower 50 is tightly fixed to the foundation 3 by a so-called PC crimping method. Further, at the upper end of the PCa member positioned at the highest position of the bottom tower 50, as shown in FIG. 10A, along the inner peripheral surface thereof, a protruding portion for installing a lift-up hydraulic jack ( Three bases 50b are provided at almost equal intervals with good balance (see also FIG. 3). The protrusion 50b is integrally formed with the PCa member in advance, and has a horizontal length enough to reach the outer peripheral surface of the middle tower 40. Note that the protrusions 50b are not limited to three locations, and can be provided with four or more locations, or can be provided with a ring shape on the entire inner peripheral surface of the PCa member 20.

  Thus, the top tower 30, the middle tower 40, and the bottom tower 50 are constructed in a nested manner that is slidable in the up and down direction, and the base members 30a and 40a and the protrusions 40b and 50b include The structure is such that the horizontal displacement is restrained by acting as a guide, and the top tower 30 and the middle tower 40 can be raised in a stable state. The top tower 30, the middle tower 40, and the bottom tower 50 are each formed in a small cylinder shape, but can also be implemented in a tapered shape that gradually tapers upward, and the horizontal sectional shape is a circular shape. Although implemented in a shape, it can also be implemented in a polygonal shape (invention of claim 7).

  Next, as shown in FIG. 10A, a lift-up hydraulic jack (center hole jack) 6 is provided on the upper surface of the protruding portion 40b of the middle tower 40 in the same manner as in the first embodiment. In this embodiment, 3 units) are installed. And the wire rope which suspended each hydraulic jack 6 ... and the base member 30a of the top tower 30 to be lifted up vertically between the outer peripheral surface of the top tower 30 and the inner peripheral surface of the middle tower 40. , It is connected with a connecting material 7 for lifting such as a stranded wire and a rod of PC steel.

  The lifting connecting member 7 is fixed to the base member 30a in advance by passing the upper end of the connecting member 7 through the through-hole provided in the protrusion 40b and the hydraulic jack 6 and using the hydraulic jack 6. It passes through the provided through hole in the vertical direction and is fixed to the base member 30a using a latching member such as a fixing nut.

  Next, wind power generators such as the nacelle 4 and the rotor blade 5 are installed on the head of the top tower 30 using a crane (not shown).

  According to the second embodiment, it is usually sufficient to lift a heavy-weight wind power generation device having a weight of over 1000 kN to the height of the top tower 30, that is, about 30 m. Therefore, it is not necessary to use a large crane at all. Absent. Incidentally, the blade length per one of the rotor blades 5 is preferably about ½ of the height of the wind power tower to be constructed. In this embodiment, a blade having a length of 45 m is used. . When the rotor blade 5 is temporarily fixed in the state shown in FIG. 9, the vertical height of the blade length is about 22.5 m (45 m × cos 60 °), and it is necessary to install at least 22.5 m above the ground. . On the other hand, the height of the top tower 30 is about 30 m. Therefore, the rotor blade 5 can be safely installed without any trouble such as collision with the ground.

  Hereinafter, the steps of raising the top tower 30 and the middle tower 40 will be described in order.

  As shown in FIG. 11, the top tower 30, the middle tower 40, and the bottom tower 50 in which the wind power generators such as the nacelle 4 and the rotor blade 5 are installed and nested, The work of lifting up to a predetermined height is started using the hydraulic jack 6 installed on the 40 protruding portions 40b (the invention according to claim 3).

  Here, the use of the balance wire 8 and winch 9 for balance control is as described in the first embodiment (the invention according to claim 5).

  Thus, by operating the hydraulic jack 6 on the protruding portion 40b, the lifting tower 7 and the base member 30a supported by the lifting are gradually moved up (lifted up) to raise the top tower 30. . The top tower 30 can be gradually raised in a stable state by the base member 30a and the projecting portion 40b that act as a guide and restrain horizontal displacement, and the stay wire 8 and the winch 9 that perform balance control. it can.

  Further, in order to raise the top tower 30 in a stable state (particularly with no rotation), a guide 1 a is provided on the outer side surface of the top tower 30 in the vertical direction, and the guide is provided on the inner side surface of the middle tower 40. It is preferable that the rail 2a slidable along 1a is provided in the vertical direction as described in the first embodiment (see FIG. 4, invention according to claim 4).

  The lift-up operation by the hydraulic jack 6 is performed until the upper surface of the base member 30a of the top tower 30 comes into contact with the lower surface of the protruding portion 40b of the middle tower 40. After the lift-up operation by the hydraulic jack 6 is completed, as shown in FIG. 12, the means described in the first embodiment (see FIGS. 5 to 8) and the base member 30a of the top tower 30 Tightening work with the protrusion 40b of the middle tower 40 is performed.

  Next, as shown in FIG. 13, the middle tower 40 is lifted up to a predetermined height by using the hydraulic jack 6 installed on the protruding portion 50b of the bottom tower 50 (invoice). Item 3).

  The required number of hydraulic jacks 6 (three in this embodiment) are installed on the upper surface of the protruding portion 50b of the bottom tower 50 in the same manner as in the first embodiment. And each hydraulic jack 6 ... and the base member 40a of the middle tower 40 to be lifted up are wire ropes suspended vertically between the outer peripheral surface of the middle tower 40 and the inner peripheral surface of the bottom tower 50. , It is connected with a connecting material 7 for lifting such as a stranded wire and a rod of PC steel.

  The lifting connecting member 7 is fixed to the base member 40a in advance by passing the upper end of the connecting member 7 through the through hole provided in the protrusion 50b and the hydraulic jack 6 and using the hydraulic jack 6. It passes through the provided through hole in the vertical direction and is fixed to the base member 40a using a latching member such as a fixing nut.

  The use of the stay control wire 8 and winch 9 for balance control is as described in the first embodiment (the invention according to claim 5).

  Thus, by operating the hydraulic jack 6 on the protruding portion 50b, the lifting tower 7 and the base member 40a suspended and supported by the lifting connection member 7 are gradually moved up (lifted up) to raise the middle tower 40. . The middle tower 40 can be gradually raised in a stable state by the base member 40a and the protruding portion 50b that act as a guide and restrain horizontal displacement, and the stay wire 8 and the winch 9 that control the balance. it can.

  Further, in order to raise the middle tower 40 in a stable state (particularly with no rotation), a guide 1 a is provided on the outer side surface of the middle tower 40 in the vertical direction, and the guide is provided on the inner side surface of the bottom tower 50. It is preferable that the rail 2a slidable along 1a is provided in the vertical direction as described in the first embodiment (see FIG. 4, invention according to claim 4).

  The lift-up operation by the hydraulic jack 6 is performed until the upper surface of the base member 40a of the middle tower 40 comes into contact with the lower surface of the protruding portion 50b of the bottom tower 50. After the lift-up operation by the hydraulic jack 6 is completed, as shown in FIG. 14, the means (see FIGS. 5 to 8) variously described in the first embodiment, the base member 40a of the middle tower 40 and Tightening work with the protruding portion 50b of the bottom tower 50 is performed, and thus the construction work of the wind power generation tower having a height of about 90 m is completed.

  As described above, according to the second embodiment, the tower body (the top tower 30, the middle tower 40, and the bottom tower 50), which is a component of the wind power generation tower, is combined inward and outward so as to be slidable in the vertical direction. Since it is constructed in a formula, installation work of wind power generators such as the nacelle 4 and the rotor blade 5 can be performed at a relatively low place of about 30 m above the ground, and yet a wind power generation tower having a height of about 90 m is constructed. Can do. In addition, since the installation work of the wind power generator can be performed at a relatively low place of about 30 m above the ground, a large crane and a large temporary member are not required at all, the construction period can be shortened, workability, safety and economic efficiency. Very good. Furthermore, since construction waste caused by temporary members and the like can be reduced as much as possible, the environment is excellent.

  Further, when the wind power generation equipment needs to be replaced due to deterioration or the like, the reverse process of the construction is performed. That is, the tight state of the base member 40a of the middle tower 40 and the protruding portion 50b of the bottom tower 50 is released, the middle tower 40 is lowered until reaching the ground, and then the base member 30a of the top tower 30 and the middle The tightening state with the projecting portion 40b of the tower 40 is released, and the replacement work is performed after the top tower 30 is lowered until it reaches the ground. Therefore, since the replacement work of the wind power generation equipment can be performed at a relatively low place of about 30 m above the ground, a large crane and a large temporary member are not required, the construction period can be shortened, workability, safety and economy. It is very excellent in sex.

  Although the embodiments have been described with reference to the drawings, the present invention is not limited to the embodiments shown in the drawings, and design modifications and application variations that are usually performed by those skilled in the art are within the scope not departing from the technical idea thereof. Note that it includes the range.

  For example, when constructing a wind power generation tower with a height of about 120 m, four towers with a height of about 30 m are built in a nested manner, and as described above, the inner tower is adjacent to the outside. A step of tightening the lower end portion of the inner tower body to the upper end portion of the tower body adjacent to the outer side of the inner tower body when the rising limit is reached. To the outermost tower. The height of the tower is preferably about 20 to 30 m per one body, but is not limited to this, and the number of towers can be 5 or more.

  When the ground height of the rotor blade 5 is higher than the height of one tower (top tower), for example, the length of the rotor blade 5 is 50 m and the ground height is 25 m (50 m × cos 60 °). In the case where the height of the top tower is 20 m, the top tower is lifted up or pushed up to the height required for installation (about 25 m) and then installed, and then the wind power tower is constructed. Is advanced.

AD is the schematic which showed the construction method of the wind power generation tower concerning Claim 1 in steps. A and B are explanatory views showing a method for constructing a tower body. It is the top view which showed the structure of the top tower and the bottom tower roughly. It is the top view which showed roughly the attachment structure of a guide and a rail. A is a longitudinal sectional view schematically showing a method for binding the top tower and the bottom tower, and B is a plan view of the same. A is a longitudinal sectional view schematically showing another method for connecting the top tower and the bottom tower, and B is a plan view thereof. It is the longitudinal cross-sectional view which showed schematically the other method of connecting a top tower and a bottom tower. It is the longitudinal cross-sectional view which showed schematically the other method of connecting a top tower and a bottom tower. AC is the schematic which showed the construction method of the wind power generation tower concerning Claim 2 in steps. A is the longitudinal cross-sectional view which showed schematically the initial state of the construction method of the wind power generation tower which concerns on Claim 2, B is the same top view. It is the longitudinal cross-sectional view which showed the step which raises a top tower roughly. It is the longitudinal cross-sectional view which showed the state which fastened the top tower and the middle tower tightly. It is the longitudinal cross-sectional view which showed the step which raises a middle tower roughly. It is the longitudinal cross-sectional view which showed schematically the step which connected the middle tower and the bottom tower and completed construction of the wind power generation tower concerning Claim 2.

Explanation of symbols

1 top tower 1a guide 2 bottom tower 2a rail 3 foundation 4 nacelle (generator body)
5 Rotor blade 6 Hydraulic jack (center hole jack)
7 Connecting material for lifting 8 Stay wire 9 Winch 10 Precast concrete member (PCa member)
10a Reinforcing bar 11 Base member 12 Tightening steel 12a High strength bolt 12b Nut 13 Tightening reinforcing bar 13a Longitudinal bar 13b Horizontal bar 14 I-shaped steel 15 Steel pipe 16 Bolt hole 20 Precast concrete member (PCa member)
20a Protruding part 30 Top tower 40 Middle tower 50 Bottom tower 30a Base member 40a Base member 40b Protruding part 50b Protruding part

Claims (7)

Two towers that are slidable in the vertical direction are built in a nested manner, the outer tower is fixed to the foundation, and wind turbine generators such as nacelles and rotor blades are installed on the head of the inner tower. Installation steps,
The inner tower is lifted by reaction force against the outer tower, and when the upper limit is reached, the lower end of the inner tower is fastened to the upper end of the outer tower. A method for constructing a wind power generation tower, characterized in that a wind power generation tower is constructed by the method described above. A plurality of towers combined inside and outside to be slidable in the vertical direction are constructed in a nested manner, the outermost tower is fixed to the foundation, and wind turbine generators such as nacelles and rotor blades are mounted on the head of the innermost tower. Steps to install
The innermost tower is lifted by reaction with the tower adjacent to the outer side, and when the upper limit is reached, the lower end of the inner tower is moved to the upper end of the tower adjacent to the outer side. Then, the outer tower body is raised against the outer tower body by a reaction force, and when the rising limit is reached, the lower end portion of the outer tower body is replaced with the upper end portion of the outer tower body. The wind power generation tower construction method is characterized in that the wind power generation tower is constructed by the step of sequentially performing the step of tightening to the inside of the outermost tower body until the adjacent tower body is raised.   The method for constructing a wind power generation tower according to claim 1 or 2, characterized in that the means for raising the tower body lifts up or pushes up the tower body adjacent to the outside as a reaction force frame.   A guide is provided in the vertical direction on either the outer side surface of the rising tower body or the inner side surface of the tower body adjacent to the outer side, and a rail slidable along the guide is provided on the other side in the vertical direction. The construction method of the wind power generation tower as described in any one of Claims 1-3.   The balance control at the time of raising a tower body is performed by the winch installed in the tower body periphery, The construction method of the wind power generation tower as described in any one of Claims 1-4 characterized by the above-mentioned.   The tower body is constructed by stacking precast concrete members in the vertical direction, and is constructed according to any one of claims 1 to 5.   The outer shape of the tower body is a cylindrical shape or a tapered shape, and the horizontal cross-sectional shape is a circular shape or a polygonal shape. Construction of a wind power generation tower according to any one of claims 1 to 6, Method.

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