JP2000283019A - Concrete windmill support tower and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for constructing a concrete windmill support tower with high rigidity and high durability at a low cost by vertically stacking and connecting a plurality of concrete cylindrical segments, and introducing a prestress by post tension method to the segments. SOLUTION: A foundation concrete 3 is placed on the ground, a plurality of PC steel products 4a are raised thereon and fixed. A first concrete cylindrical segment 2a forming the bottom stage of a concrete windmill support tower 1 is built by inserting the PC steel products 4a to a plurality of sheath holes 5 vertically extending through from the upper end surface to the lower end surface. A tensile force is given to the PC steel products 4a in the concrete cylindrical segment 2a, and the end part of a part 4a' thereof is fixed to the upper end surface of the concrete cylindrical segment 2a by a fixture 7, whereby a prestress 6 is introduced to the concrete cylindrical segment 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind turbine support tower used for wind power generation and the like.

[0002]

2. Description of the Related Art
The support tower for wind turbines used for wind power generation is made of steel, and its rigidity and durability are limited. I was In addition, maintenance costs were high for steel support towers, such as requiring repainting for maintenance.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and a supporting tower for a windmill is made of concrete, and a low-cost, high-rigidity and high-durability supporting windmill is provided. It provides a tower and how to build it. That is, the present invention provides: (1) a plurality of concrete cylindrical segments for constituting a wind turbine support tower, which are vertically stacked and connected;
A concrete wind turbine support tower, wherein prestressing by a post tension method is introduced into the plurality of segments. (2) The concrete wind turbine support tower according to the item 1, wherein a key portion and a key groove portion for preventing lateral displacement are formed on an upper end surface and a lower end surface of the cylindrical segment. (3) A method of constructing a concrete wind turbine support tower, comprising: A first step of erecting and fixing a PC steel material to the foundation concrete on the ground; A second step of laying the lowermost first concrete cylindrical segment on the foundation concrete in the first step by inserting the PC steel material into the sheath hole; A third step of introducing prestress into the first concrete cylindrical segment of the second step through the PC steel material;
Process and. A fourth PC steel member extending upward through a connector to the PC steel member at the upper end portion of the concrete tubular segment into which the first prestress obtained in the third step has been introduced.
Process and. A fifth step of laying a second concrete tubular segment on the first concrete tubular segment of the fourth step by inserting the another PC steel material into the sheath hole; A sixth step of introducing prestress into the second concrete cylindrical segment of the fifth step through the another PC steel material; And connecting and building the required number of third concrete cylindrical segments in the same manner as in the fourth to sixth steps in the same manner. How to build. (4) A method for constructing a concrete wind turbine support tower, comprising: . A first step of placing a lowermost first concrete tubular segment on the foundation concrete on the ground; The second step is to insert a PC steel material into the sheath hole of the cylindrical segment and to stand and fix it on the foundation concrete.
Process and. A third step of introducing prestress into the first concrete cylindrical segment of the second step through the PC steel material;
Process and. A fourth step of placing a second concrete tubular segment on the first concrete tubular segment of the third step; By inserting a PC steel material at the upper end of the concrete tubular segment into which the first prestress obtained in the fourth step has been introduced into the sheath hole of the second concrete tubular segment, the connecting tool is connected. A fifth step of extending another PC steel material upward through the fifth step; A sixth step of introducing prestress into the second concrete cylindrical segment of the fifth step through the another PC steel material; A step of connecting and building the required number of third, fourth,... Concrete cylindrical segments in the same manner as in the fourth to sixth steps in the following manner. How to build a support tower. (5) A key portion and a key groove portion for preventing lateral displacement are formed on the upper end surface and the lower end surface of the cylindrical segment, and when another segment is stacked on the segment, the key portion and the key groove portion are fitted and fitted. 5. The method for constructing a concrete wind turbine support tower according to the above item 3 or 4, wherein the method is performed in combination.

[0004]

BEST MODE FOR CARRYING OUT THE INVENTION A concrete wind turbine support tower according to the present invention is obtained by introducing a prestressing method by a post tension method into a concrete cylindrical segment. Prestress refers to the internal force of prestressed concrete, which is a concrete to which an internal force has been applied in advance so as to cancel the stress generated in a structure due to an external force, and the prestressed concrete is made of a high-strength steel (PC By prestressing the concrete member by tensioning the steel member), it is possible to prevent the occurrence of cracks at all, and the concrete member is excellent in durability and watertight.

[0005] Prestress is roughly classified into a pretension system and a post-tension system according to the time of introduction. In the pretension method, concrete is struck while giving tension to the PC steel, the PC steel is cut after the concrete is hardened, and the tensile force applied to the PC steel is applied to the concrete by bonding the PC steel to the concrete. This is a way to tell the prestress. On the other hand, the post-tension method adopted in the present invention is a method in which, after hardening of concrete, a tensile force is applied to a PC steel material to fix an end thereof to apply a prestress. In the case of the post-tension method, The arrangement of the PC steel material is free, and it has a feature that a large prestress can be easily introduced into cast-in-place concrete having various shapes. In addition, as a PC steel material, a PC steel wire,
PC steel strands, PC steel rods and the like are used, but those made of high-strength FRP can be used.

The concrete wind turbine support tower of the present invention is composed of a plurality of concrete tubular segments. Here, as the concrete for forming the segments, general concrete is used, but other concrete such as high-strength concrete or lightweight concrete can be used according to the application. In addition, although the segment is cylindrical, the cylindrical shape may be circular or a polyhedral structure.
When the cylindrical segment is manufactured by casting new concrete on the upper surface of the other pre-cast (precast) cylindrical segment, the joint surface between the upper and lower segments is constructed during the construction of the wind turbine support tower. However, it is needless to say that a separately manufactured mold may be used. If upper and lower end surfaces of the upper and lower cylindrical segments are formed with concave and convex surfaces such as a key portion and a key groove portion to be described later, these surfaces are overlapped (fitted) to ensure the upper and lower cylindrical segments can be easily secured. Can be linked to

[0007] A key portion and a key groove portion for preventing lateral displacement are formed on the upper end surface and the lower end surface of the cylindrical segment. The key portion and the key groove portion are in a relationship of a male type and a female type, and as the shape of the key portion, a convex surface is formed in a trapezoidal shape, the concave surface is an opposite shape, and the convex surface is fitted with concrete. The trapezoidal joint key, the convex surface of the key part is formed in a multi-stage shape,
A concrete multi-step joining key in which the concave surface has the opposite shape and the convex surface is fitted, a concrete corrugated joining key in which the convex surface is formed in a wavy shape, the concave surface has the opposite shape and the convex surface is fitted, and the convex portion is a pin. A steel joining key which is formed in a shape, has a round recess, and has a shape in which the pin is fitted. The key portion transmits force (shear force) in the longitudinal direction of the member and does not transmit force in the perpendicular direction, so a plurality of key portions are provided so that a shear force transmission effect can be expected for wind power from any direction. Have been. As described above, the force is not transmitted in the right angle direction. Therefore, when two keys are provided, the keys are not provided in a linear direction, that is, in a direction opposite to 180 degrees, and the arrangement is such that a shearing force transmission effect can be expected. In particular, it is desirable to provide three key portions, which are the most stable arrangement, at equal intervals.

[0008]

Next, an embodiment of the method for constructing a concrete wind turbine support tower described above will be described in detail with reference to the drawings. FIG. 1 is an overall side view and a partially enlarged sectional view of a concrete wind turbine support tower of the present invention. FIG. 2 is an enlarged view of a segment, and FIG. 3 is a detailed view of various keys for preventing lateral displacement. FIGS. 4, 5 and 6 show a construction procedure of the concrete wind turbine support tower of the present invention, and FIG. 7 shows a connecting member of PC steel used in the present invention. In the figure, 1 is a concrete wind turbine support tower of the present invention, 2.2a, 2b.
2c is a concrete cylindrical segment, 3 is basic concrete, and 4.4, 4b, 4c are PC steel materials. 5 is a sheath hole, 6 is a prestress introduction direction,
7 is a fixing device, and 8 is a connecting device. Further, 9 is a key portion, and 10 is a key groove portion.

As shown in FIG. 1 (a), a concrete wind turbine support tower 1 of the present invention is constructed by stacking a plurality of concrete tubular segments 2 vertically. As shown in FIG. 1B, which is a cross-sectional view taken along the line AA in FIG. 1A, a plurality of sheath holes 5 are formed in each of the concrete cylindrical segments 2. The PC steel material 4 is inserted. Then, a pre-stress is introduced into each of the concrete cylindrical segments 2 by a post-tension method. A plurality of key portions 9 and key groove portions 10 for preventing lateral displacement are formed on the upper end surface and the lower end surface of each concrete cylindrical segment 2 as shown in FIG. In this embodiment, concrete corrugated joining keys are formed, and three most stable keys are formed. Key part 9
There are roughly four shapes as shown in FIG. FIG. 3A shows a trapezoidal joint key made of concrete, in which a key-shaped convex portion is formed in a trapezoidal shape. FIG. 3B shows a concrete multi-step joining key.
The convex portion of the key portion has a multi-stage shape, and the concrete corrugated joining key of (c) has a corrugated shape of the key portion. Further, (d) is a steel joining key, and the projection is formed in a pin shape.

FIG. 4, FIG. 5, and FIG. 6 show a method of constructing a concrete wind turbine support tower 1. In FIG. 4 (1), in a first step, a foundation concrete 3 is cast on the ground. A plurality of PC steel materials 4a are erected on concrete 3 and fixed. (2) In the second step, the first concrete cylindrical segment 2a, which is the lowermost stage of the concrete wind turbine support tower 1, is vertically penetrated from the upper end surface to the lower end surface on the foundation concrete 3. PC steel material 4 erected in the first step in the plurality of sheath holes 5
a is inserted. (3) Then, as a third step, a drawing force is applied to the PC steel material 4a in the first concrete cylindrical segment 2a of the second step, and
By fixing the end of the part 4a 'of the C steel material 4a to the upper end surface of the concrete cylindrical segment 2a with the fixing tool 7,
Prestress 6 is introduced.

FIG. 5 (4) Next, of the PC steel material 4a at the upper end of the first concrete cylindrical segment 4a to which the first prestress 6a has been applied in the third step, the fixing device is formed in the third step. PC steel material 4 excluding PC steel material 4a 'fixed in 7
a and the PC steel 4b for extension are connected by the connecting tool 8 shown in FIG. (5) PC steel 4b extended in the fourth step
Is inserted through the sheath hole 5 of the second concrete cylindrical segment 2b, and the first concrete cylindrical segment 4
After the adhesive is applied to the joint surface between the first concrete tubular segment 2a and the second concrete tubular segment 2b, the second concrete tubular segment 2b is built on the first concrete tubular segment 2a.

In a fifth step, the first concrete cylindrical segment 2a and the second concrete cylindrical segment 2a
When stacking b, the key portion provided on the upper end surface of the first concrete cylindrical segment 2a and the key groove portion provided on the lower end portion of the second concrete cylindrical segment 2b are fitted and fitted. I do. (See FIG. 2.) In addition, in the present embodiment, a resin-based adhesive is applied to the joint surface between the first concrete cylindrical segment 2a and the second concrete cylindrical segment 2b, but cement mortar is used. It is also preferable to do so.

(6) As a sixth step, the fifth step
A drawing force is applied to the PC steel material 4b in the second concrete cylindrical segment 2b in the process in the same manner as in the third process, and the end is fixed to the upper end surface of the concrete cylindrical segment 2b by the fixing device 7. , A prestress 6 is introduced. FIG.
(7) Similarly to the above procedure, the PC steel member 4b and the extension PC steel member 4c are connected by the connecting tool 8, and the sheath hole 5 of the third concrete cylindrical segment 2c is connected to the extension PC steel member 4c.
c, the second concrete cylindrical segment 2b
An adhesive is applied to the joint surface between the third concrete tubular segment 2c and the third concrete tubular segment 2c, and the third concrete tubular segment 2c is built on the second concrete tubular segment 2b. After that, prestress is introduced into the third concrete cylindrical segment 2C. Similarly, the fourth concrete tubular segment, the fifth concrete tubular segment,... Are connected to construct a concrete wind turbine support tower.

The first and second steps may be performed in reverse order, and the fourth and fifth steps may be performed in reverse order. That is, in the method for constructing a concrete wind turbine support tower, (1) a first step of placing the lowermost first concrete cylindrical segment 2a on the foundation concrete 3 on the ground, and (2) PC
A second steel material 4a is inserted through the sheath hole 5 of the cylindrical segment and is erected and fixed on the foundation concrete 3.
And (3) a third step of introducing a prestress 6 into the first concrete cylindrical segment 2a of the second step via the PC steel material 4a, and (4) a first concrete of the third step A fourth step of placing the second concrete cylindrical segment 2b on the cylindrical segment 2a;
(5) In the PC steel material 4a at the upper end of the concrete tubular segment 2a into which the first prestress 6 obtained in the fourth step is introduced, the sheath hole 5 of the second concrete tubular segment 2b is provided. And a fifth step of extending another PC steel material 4b upward through the connecting tool 8 through
(6) The sixth step of introducing a prestress 6 into the second concrete cylindrical segment 2b of the fifth step via the another PC steel material 4b in the fifth step, and (7) the fourth step
The sixth and sixth steps are followed by connecting and building the required number of third, fourth,... Concrete cylindrical segments 2c.

[0015]

According to the present invention, high durability is obtained and rigidity is improved by introducing prestress into a large number of concrete tubular segments constituting a concrete wind turbine support tower, so that high rigidity is obtained. There is no limit on the size, and a wind turbine support tower having a wide range of application can be constructed. In addition, by providing the key portion and the key groove portion on the joint surface between the concrete cylindrical segments, resistance to horizontal load is increased, and workability is improved. Furthermore, since the rigidity of the concrete windmill support tower is improved by the introduction of prestress, the amplitude due to the wind can be suppressed to a small value, and noise during operation of wind power generation or the like can be suppressed. According to the method for constructing a concrete wind turbine support tower of the present invention, since the construction is easy, the construction period can be shortened, and the material cost is low and the corrosion resistance is good, so that the construction cost and the maintenance management cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall side view and sectional view of a concrete wind turbine support tower of the present invention.

FIG. 2 is a detailed view of a segment.

FIG. 3 is a detailed view of various types of keys for preventing lateral displacement.

FIG. 4 is a construction procedure diagram (first to third steps) of a concrete wind turbine support tower of the present invention.

FIG. 5 is a construction procedure diagram of a concrete wind turbine support tower of the present invention (fourth to sixth steps).

FIG. 6 is a construction procedure diagram of a concrete wind turbine support tower of the present invention (seventh step).

FIG. 7 is a connecting member of PC steel used in the practice of the method of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wind turbine support tower made of concrete 2 2 a 2 b 2 c concrete tubular segment 3 foundation concrete 4 4 a 4 b 4 c PC steel material 5 sheath hole 6 prestress introduction direction 7 fixing tool 8 connecting tool 9 key section 10 key groove section

Claims (5)

[Claims] A plurality of concrete cylindrical segments for constituting a wind turbine support tower are vertically stacked and connected, and pre-stress is introduced into the plurality of segments by a post tension system. Concrete windmill support tower. 2. A concrete wind turbine support tower according to claim 1, wherein a key portion and a key groove portion for preventing lateral displacement are formed on an upper end surface and a lower end surface of the cylindrical segment. 3. A method for constructing a concrete wind turbine support tower, comprising: (1) a first step of erecting and fixing a PC steel material on a foundation concrete on the ground; and (2) a first step on the foundation concrete. A second step in which the lowermost first concrete cylindrical segment is built by inserting the PC steel into the sheath hole; and (3) the first concrete cylindrical segment in the second step is formed in the first concrete cylindrical segment. A third step of introducing a prestress through the PC steel; and (4) connecting a connector to the PC steel at the upper end of the concrete tubular segment into which the first prestress obtained in the third step is introduced. A fourth step of extending another PC steel material upward through the second step, and (5) a second step on the first concrete cylindrical segment of the fourth step.
A fifth step of inserting the another PC steel material into the sheath hole by inserting the another PC steel material into a sheath tube; and (6) placing the another PC steel material in the second concrete cylindrical segment in the fifth step. The sixth step of introducing a prestress through the same manner as in (7) and thereafter, connecting the required number of third, fourth,... Concrete cylindrical segments in the same manner as in the fourth to sixth steps. A method for constructing a concrete windmill support tower, comprising: 4. A method for constructing a concrete wind turbine support tower, comprising: (1) a first step of placing a lowermost first concrete cylindrical segment on a foundation concrete on a ground; A) a second step of inserting a PC steel material through the sheath hole of the cylindrical segment to stand upright on the base concrete and fixing the same; and (3) the first concrete cylindrical segment of the second step A third step of introducing a prestress through a PC steel; and (4) a first step of the third step.
A fourth step of placing a second concrete tubular segment on the concrete tubular segment of (a), (5)
By inserting a PC steel material at the upper end of the concrete tubular segment into which the first prestress obtained in the fourth step has been introduced into the sheath hole of the second concrete tubular segment, the connecting tool is connected. A fifth step of extending another PC steel material upward through a second step, and (6) a sixth step of introducing prestress into the second concrete cylindrical segment of the fifth step via the another PC steel material. (7) Similarly, the required number of the third, fourth,.
Connecting the concrete cylindrical segments of the concrete wind turbine to build the concrete wind turbine support tower. 5. A key portion and a key groove portion for preventing lateral displacement are formed on an upper end surface and a lower end surface of a cylindrical segment. When another segment is stacked on the segment, the key portion and the key groove portion are formed. The method for constructing a concrete wind turbine support tower according to claim 3 or 4, wherein the method is performed by fitting and fitting.