KR101383162B1 - Modular Wind Power Tower using Multiple Prestressing Tendons - Google Patents

Abstract

Modular wind tower through the multi-stage prestress of the present invention is a wind tower in which a plurality of modules are laminated by being prestressed by the tension material inside, the module is a plurality of laminated modules through which the tension material penetrates, and the tension material therein It characterized in that it consists of a plurality of tension modules consisting of a tension introduction portion for penetrating and tensioning the tension member while penetrating.

Description

Modular Wind Power Tower using Multiple Prestressing Tendons

The present invention relates to a modular wind tower through prestress, which will be described in more detail. In the wind tower in which the modules are stacked, the prestress is applied at a plurality of points to prevent stress concentration, and the prestress is applied at the hollow portion of the module. And it relates to a modular wind tower through a multi-stage prestress easy to maintain such as re-tension by being settled.

In general, the wind tower is a main structure of the wind power generator, which supports the rotor blades and nacelle, and is mainly manufactured by steel pipe. In particular, wind power towers of large steel pipes are made through complex manufacturing processes through many welding processes. That is, in manufacturing a wind tower of a large steel pipe, there is a problem that the workability is significantly reduced due to its own weight. Moreover, the wind tower by such a large steel pipe is being installed in the sea a lot, it is exposed to the durability problems such as corrosion.

On the other hand, such a large wind tower has a longer blade length as the generator capacity increases, and the size of the tower supporting the blade and the nacelle is increasing. As the wind tower grows, it must be designed to withstand not only vertical load, but also lateral load and bending moment.

Conventionally, in the case of steel pipes in the construction of such a large wind tower, the cross section is increased, the self weight is increased, it is natural that such an increase in cost, such as cost-effectiveness and economic feasibility of construction.

Patent No. 713692 has proposed a technique for constructing a piers by pre-stressing tension material by stacking units in the field after making hollow concrete filling units constrained inside, and dedicating such technologies to wind towers. The research to be conducted is in progress.

However, the method of stacking the units and applying a method of prestressing and fixing the tension member at the uppermost part of the stacked units has such a disadvantage that the effectiveness of the method decreases as the height of the tower increases. That is, the application of prestress to the tension member at the top end causes a large stress concentration at the top and bottom fixing parts, causing a problem of local breakdown.

In addition, since re-tension may be necessary due to prestress loss after construction, there is a problem that re-tension is not easy due to interference with an upper structure such as a turbine when prestress is applied to the tension member only at the top as described above.

Patent Registration No.

Accordingly, the present invention has been made in order to solve the problems caused by the prior art, the object of the present invention in the construction of a large wind tower by the module to apply a prestress in multiple stages to prevent stress concentration, re-tension after construction It is intended to provide a wind tower that is easy to maintain and increased convenience of maintenance.

Modular wind tower through the multi-stage prestress of the present invention as a means for achieving the above object is a wind tower in which a plurality of modules are laminated by being prestressed by an internal tension material, the module is a plurality of tension material penetrating therein Characterized in that the laminated module and a plurality of tension modules consisting of a tension introduction portion for fixing the tension material through the tension material penetrating therein.

The module may include a concrete part forming a body, a hollow part inside the concrete part, and a plurality of tension holes through which a tension member penetrates the concrete part, and the tension introduction part configured in the tension module may be formed in the hollow part. It is characterized in that it comprises a fixing hole formed to communicate with the tension hole at the peripheral edge, and a fixing end protruding to the inner peripheral edge of the hollow portion while communicating with the fixing hole.

On the other hand, the uppermost module located in the uppermost of the tension module is characterized in that the tension member is penetrated only through the fixing hole to be fixed in the tensioned state in the fixing end.

In addition, the uppermost module is characterized in that the plurality of connecting rods are configured to protrude to the upper end to the upper structure.

On the other hand, in the module, the outer periphery of the concrete portion or the inner periphery of the hollow portion is characterized in that the outer portion or the inner tube portion is configured as a restriction tube.

In the above module, a connector having an H-shaped cross section is placed between modules stacked up and down, and assembled between modules.

In addition, the connector is H-shaped cross section, the upper groove and the lower groove is formed on the upper surface, a plurality of upper projections and the plurality of lower projections are formed in the upper groove. An injection passage penetrating the upper protrusion and the lower protrusion is formed therein, and in each module, a plurality of fixings facing the upper protrusion and the lower protrusion on the upper and lower surfaces of the concrete part, respectively. The ball is formed, the grout is filled in the fixing hole through the injection path is characterized in that the assembly between the upper, lower modules.

The present invention has the following effects.

First, in assembling the wind tower by stacking modules, there is an advantage in that structural defects due to stress concentration can be removed by applying prestress in multiple stages.

Second, it is easy to re-tension after construction by tensioning and fixing the tension member with the hollow part formed in the module, possible to re-tension without being affected by the upper structure of the wind tower, and re-tighten only the section that needs reinforcement. There is this.

Figure 1a and Figure 1b is a side cross-sectional view showing a basic example of a module of one configuration in the modular wind tower through the multi-stage prestress according to the present invention.
Figure 2a to 2c is a schematic diagram showing an example in which a modular wind tower is installed through a multi-stage prestress in accordance with the present invention.
Figure 3 is a schematic diagram showing the topmost module of the modular wind tower through the multi-stage prestress in accordance with the present invention.
Figures 4a and 4b is a side cross-sectional view showing each embodiment of a module of one configuration in a modular wind tower through a multi-stage prestress in accordance with the present invention.
Figure 5 is a schematic diagram showing the joint fastening means between the upper and lower modules in the modular wind tower through the multi-stage prestress according to the present invention.

Modular wind tower through the multi-stage prestress of the present invention is a wind tower in which a plurality of modules are laminated by being prestressed by the tension material inside, the module is a plurality of laminated modules through which the tension material penetrates, and the tension material therein It characterized in that it consists of a plurality of tension modules consisting of a tension introduction portion for penetrating and tensioning the tension member while penetrating.

That is, in the present invention, a module is stacked to form a wind tower, but by placing a plurality of tension modules between a plurality of stacked modules, prestressing is not applied only at the uppermost stage, but prestressing is applied step by step to prevent concentrated stress on a specific part, thereby providing structural stability. Will be promoted.

In addition, the module includes a concrete part constituting the body and the hollow part inside the concrete part, the concrete part is composed of a plurality of tension holes through the tension material, the tension introduction portion configured in the tension module inner peripheral edge of the concrete part It is preferable that the fixing hole formed to communicate with the tension hole, and the fixing end protruding in the inner periphery while communicating with the fixing hole. Thus, the present invention is characterized in that it is easy to re-tension after construction by forming a hollow in each module to configure the tension introduction portion in the inner circumference, especially in the case of a tension module.

In addition, the uppermost module located at the top of the tension module is characterized in that the tension member penetrates only through the fixing holes to be fixed in the tensioned state, so that it is easy to be re-tensioned without being affected by the upper structure in the uppermost module. There is a characteristic.

In addition, the uppermost module may be configured to be assembled with the upper structure by being fastened to the upper structure is configured to project a plurality of connecting rods to the upper end.

On the other hand, in the module, the outer circumferential edge or the inner circumferential edge of the concrete portion may be configured with a constrained tube inside, and the outer portion or the inner tube portion on the outer circumference or inner circumference of the concrete portion. In other words, in the present invention, the module may be composed of hollow reinforced concrete, hollow internally constrained reinforced concrete, hollow internal and external confined concrete.

Thus, in the present invention, in forming the concrete part, the hollow part may be formed in the interior with less contribution to warpage, thereby reducing the material and the weight thereof. In this case, the concrete portion is preferably composed of reinforced concrete. In addition, the present invention may be to restrain the hollow portion by the inner tube portion, in this case, it is preferable that the concrete portion is composed of reinforced concrete.

In addition, the present invention is to be able to double the rigidity and ductility by restraining the hollow portion by the inner tube portion or in addition to the outer peripheral edge of the concrete portion by the outer portion. In addition, since the inner pipe part or the outer part is made of FRP material, it is possible to prevent deterioration due to the salinity of concrete, thereby achieving structural stability. In this case, it is reasonable that the concrete part is made of reinforced concrete / concrete.

In other words, as the wind tower becomes larger in size, a wind tower structure that can accommodate larger bending moments and lateral displacements is required. Therefore, a hollow is formed inside to endure large bending moments, thereby adopting a cross section that reduces its own weight. In order to prevent brittle fracture by restraining the decrease in the ductility due to the hollow by the outer or inner tube portion. In addition, local buckling can be prevented based on such a structure.

Hereinafter, the embodiment of the present invention will be described in detail with reference to the accompanying drawings, FIGS. 1A to 5.

Modular wind tower 100 through a multi-stage prestress of the present invention relates to a wind tower that is assembled by stacking a plurality of modules by prestressed by the tension material therein.

In the present invention, the module 100 includes a lamination module 110a and a tension module 110b as shown in FIGS. 1A and 1B, and the lamination module 110a is stacked as shown in FIG. 2. The tension module 110b is disposed between the stacked modules 110a to constitute the wind tower 100 of the present invention.

The laminated module 110a and the tension module 110b are characterized in that the tension module 110b is tensioned and fixed to some of the tension members penetrating by height while the plurality of tension members penetrate therein. That is, according to the present invention, the module 110 is stacked to form a wind tower, but by placing a plurality of tension modules 110b between the plurality of stacked modules 110a, prestressing is applied not only at the uppermost stage but by prestressing step by step. It is intended to promote structural stability by enabling prestressing without concentration.

To this end, the module 110 is composed of a hollow portion 111, so that a plurality of tension holes 113 through which the tension member 120 penetrates the concrete portion 112 forming the body. The concrete part 112 may be made of a reinforced concrete bar, the reinforcing bar reinforcement is omitted in the drawing. The shape of the concrete part 112 does not limit its shape such as a hexahedron and a cylindrical shape.

As shown in FIG. 1B, the tension module 110b further includes tension introduction parts 114 and 115, and the tension introduction parts 114 and 115 include a fixing hole 114 and a fixing end 115. The fixing hole 114 is formed to communicate with the tension hole 113 at the inner circumference of the concrete portion 112. In addition, the fixing end 115 is protruded from the inner circumference of the concrete portion 112 is configured to communicate with the fixing hole 114. That is, some of the plurality of tension members 120 penetrating through the tension holes 113 in the tension module 110b are exposed to the hollow part 111 through the fixing holes 114, and thus the tension members are exposed. Prestressing is applied to a portion of the tension member 120 by tensioning the 120 and fixing the anchoring portion 115. As the pre-stressing is applied to some of the tension members 120 through the hollow part 111 in the tension module 110b, re-tensioning is facilitated by the pre-stress loss after construction, which is a problem in the entire wind tower 100. Re-tensioning is possible only in some sections, enabling efficient operation.

Figure 2 shows an example in which the wind tower 100 of the present invention is installed, Figure 2 shows an example in which the wind tower 100 is completed by three pre-stressing, this is of the tension module (110b) Naturally, it is optional by number. As shown in FIG. 2, the wind tower 100 of the present invention first installs a plurality of tension members 120 on the foundation 10 and stacks the tension modules 120 through the stack module 110a to a predetermined height. , Assembled. Thereafter, the tension module 110b is stacked on the upper part of the laminated module 110, in which some tension members 120 pass through the tension holes 113, and the remaining tension members 120 may pass through the fixing holes 114. Prestressing is applied to the hollow part 111 through the fixing unit 115 to fix it. In this way, prestress is introduced into the module 110 to be stacked first.

Thereafter, the lamination module 110a stacked only on the tension member 120 penetrating the tension module 110b so as to penetrate therethrough, and when the lamination module 110a is laminated and assembled to a predetermined height, the tension module ( 110b) is laminated and prestressing is applied to some of the tension members 120 in the same manner as mentioned above.

Thereafter, the lamination module 110 stacked only on the tension member 120 penetrating through the tension module 110b is stacked up to a design height so as to penetrate the tension module 110b, and is positioned at the top of the tension module 110b. The fixing end 115 is applied to the module 110c by prestressing the hollow part 111 to penetrate the fixing hole 114 with respect to the entire tension member 120 penetrating the laminated module 110a stacked below. To settle in. In this way, in the uppermost module 110c, all the tension members 120 are fixed to the fixing end 115 at the hollow part 111, thereby making it easy to re-tension without being affected by the upper structure.

In addition, the uppermost module (110c) is a plurality of connecting rods 117 is configured to protrude to the upper end to the upper end as shown in Figure 3 it is reasonable to be fastened by the upper structure 20, such as a turbine support and bolted. That is, the wind tower 100 of the present invention is not only configured as an assembly itself, but also to be easily assembled by being configured with the upper structure 20 connected thereto. As shown in FIG. 3, the connecting rod 117 may be configured to be firmly formed at the upper end of the uppermost module 110b by the band reinforcing bars 116.

Meanwhile, the present invention provides a module 110 of another embodiment as shown in FIGS. 4A and 4B. 4A and 4B illustrate the case of the stacked module 110a, but the same embodiment may also be applied to the tension module 110b.

First, as shown in FIG. 4A, an example in which the inner tube part 130 is further configured as a constraining tube on an inner circumference of the concrete part 112, ie, an inner surface of the hollow part 111, is illustrated. The inner tube portion 130 restrains the concrete portion 112 so that the concrete portion 112 is under a triaxial compressive load. By doing so, the hollow portion 111 of the concrete portion 112 can be formed to reduce self-weight, thereby facilitating construction, and brittle fracture of the cross section of the hollow portion 111 of the concrete portion 112 that may occur incidentally. It is possible to prevent the reinforcement of the rigidity against the bending moment by the insertion of the inner tube portion 130, thereby reducing the cross-section, self-weight.

In addition, although not shown in Figure 4a, in the case of the tension module (110b) by tensioning the tension member 120 in the hollow portion 111 may cause local breakdown due to the stress caused by the tension in the concrete portion 112 Bar, the inner tube portion 130 is to be prevented by restraining the concrete portion 112 therein.

In addition, as shown in FIG. 4A, an example in which the stacking module 110 includes only the inner tube part 130 and the concrete part 112 is provided. In this case, although not shown in the drawing, the longitudinal direction of the concrete part 112 is provided. Reinforcement of the reinforcing bars and transverse reinforcement can be further formed to form a structurally rigid module by the restraining force of the inner tube portion 130 and the reinforcement of the longitudinal reinforcement and transverse reinforcement.

Meanwhile, as shown in FIG. 4B, the inner tube part 130 is formed as a constraining tube on the inner circumference of the concrete part 112, that is, the hollow part 111, and the concrete part 112 as shown in FIG. 4B. An example is shown in which the exterior portion 140 is further configured on the outer circumference thereof. As shown in FIG. 4B, the inner tube part 130 is constrained at the inner circumference of the hollow part 111 in the concrete part 112, and the outer part 140 is constrained at the outer circumference of the concrete part 112. It can be configured to reinforce rigidity and ductility. In this case as well, although not shown in the drawings, it is obvious that the longitudinal reinforcing bars and transverse reinforcing bars may be further reinforced to the concrete part 112. When the inner tube portion 130 and the outer portion 140 are configured as described above, the inner tube portion 130 and the outer portion 140 may be used as formwork, and thus there is an advantage in the field construction and precast member manufacturing.

Meanwhile, the inner tube part 130 and the outer part 140 may be made of steel to secure rigidity against bending moments. However, in some cases, the inner pipe part 130 and the outer part 140 may have corrosion resistance and ductility in order to improve resistance to corrosive environments. It can be configured with FRP.

More preferably, it is proper that the FRP is made of CFRP (Carbon), AFRP (Aramid), GFRP (Glass) or the like in addition to a reinforcing material to selectively use a material suitable for the site construction conditions. Incidentally, By monitoring the self-weight by use, it is possible to facilitate the construction.

Meanwhile, in the wind tower 100 of the present invention, as described above, each module is joined by multi-stage prestressing as well as a separate bonding structure may be presented. First, in the case of the modules 110a and 110b illustrated in FIGS. 1A and 1B, the bonding structure between the modules may be presented by a bond, a shear key, or the like, although not shown in the drawing.

In addition, in the case of the module 110 shown in FIG. 4A, although not shown in the drawings, a bonding structure such as an epoxy resin bond, a shear key, and the like, and in addition, a bonding structure such as bolt coupling and welding may be provided between the inner tube portions 130. Can be presented.

In addition, although the module 110 shown in FIG. 4B is not shown in the drawings, a bonding structure such as an epoxy resin bond, a shear key, and the like, in addition to bolting, welding, etc., between the inner tube portion 130 and the outer portion 140, may be used. The junction structure of can be presented.

Meanwhile, in the present invention, another embodiment of the junction structure between the modules is shown in FIG. 5. In the bonding structure 150 of the present embodiment, the connector 151 having the H-shaped cross section is placed at the junction of the upper and lower modules in each module 110 to be assembled between the upper and lower modules. To describe this in more detail, the connector 151 has an upper fitting groove 152 formed on the upper surface of the cross section so that the lower end of the module 110 stacked on the upper side of the connector 151 is inserted therein. ) Is configured to insert the upper end of the module 110 stacked on the bottom. In this way, the upper and lower modules 110 are inserted into the connector 151 so that the exterior portion 140 of the joint portion is supported by the outer support edge 154 and the inner support edge 155. By the inner tube portion 130 is to be supported. 5 illustrates an example of a module according to the embodiment of FIG. 4B, but is not limited thereto. In addition, although not shown in the drawings, a plurality of through holes are formed in the connector 151 to allow the tension member 120 to pass therethrough.

In addition, the connector 151 has a plurality of upper protrusions 156 in the upper fitting groove 152, and a plurality of lower protrusions 157 in the lower groove 153. An injection passage 158 penetrates from the outer support edge 154 to the upper protrusion 156 and the lower protrusion 157. In this way, in each module 110, the concrete part 112 is formed such that the fastening hole 159 facing the upper protrusion 156 and the lower protrusion 157 is formed in the injection passage 158. By injecting the grout (G) through the upper projection 156 and the lower projection 157 is inserted into the fastening hole 159, the grout (G) is tightly filled is to be able to attach a firm joint. .

The above description has been described as an example by the embodiments of the present invention, but is not limited to the above embodiments and those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. . Accordingly, the technical scope of the present invention should not be limited to the details described in the specification, but should be defined by the claims.

110: module 120: tension material
130: inner tube portion 140: outer portion

Claims (7)

In a wind tower, in which a plurality of modules are laminated by being prestressed by an internal tension member,
The module is composed of a plurality of laminated modules having a plurality of laminated modules through which the tension material penetrates therein, and a tension introduction portion for tensioning and fixing the tension material while penetrating the tension material therein,
The module includes a concrete part forming a body, a hollow part inside the concrete part, and a plurality of tension holes through which a tension member penetrates the concrete part.
In the module, a connector having an H-shaped cross section is placed between modules stacked up and down, and assembled between modules.
The connector has an upper groove and a lower groove on the upper surface, a plurality of upper protrusions on the upper groove and a plurality of lower protrusions on the lower groove, and the upper protrusion on the inside of the connector. And an injection passage penetrating the protrusions,
In each module, the concrete part has a plurality of fastening holes facing the upper protrusion and the lower protrusion, respectively, on the upper and lower surfaces thereof, and grout filled in the fastening holes is formed through the injection path. Modular wind towers with multistage prestressing, characterized in that they are assembled in the liver.
The method according to claim 1,
The tension introduction portion configured in the tension module comprises a fixing hole formed to communicate with the tension hole at the inner circumference of the hollow portion, and a multi-stage prestress characterized in that the fixing end protruding to the inner circumference of the hollow portion while communicating with the fixing hole. Modular wind tower through.
3. The method of claim 2,
Modular wind tower through the multi-stage prestress, characterized in that the topmost module located at the top of the tension module is settled in the tensioned state through the tension member only through the fixing hole.
The method of claim 3,
The uppermost module is a modular wind tower through a multi-stage prestress, characterized in that the plurality of connecting rods are configured to protrude to the upper end to the upper structure.
3. The method of claim 2,
In the module, the outer periphery of the concrete portion or the inner periphery of the hollow portion of the modular wind tower through the multi-stage prestress, characterized in that the outer portion or the inner tube portion is configured as a restraining tube.
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