CN114837899A - Combined anti-erosion semi-fabricated fan tower cylinder - Google Patents

Abstract

The invention discloses a combined anti-erosion semi-assembly type fan tower cylinder which is composed of a top prefabricated tower cylinder and a semi-assembly type tower cylinder, wherein the semi-assembly type tower cylinder comprises an assembly steel cylinder, a concrete layer, a glass fiber plastic layer and a middle annular member. The assembly steel cylinder is formed by the assembly of a plurality of steel cylinder long components and steel cylinder short components through the prestressing force bolted connection assembly for the assembled structure, the bottom of assembly steel cylinder is connected with the fan basis, the assembly steel cylinder assembles and pours its outside concrete layer after certain height, with the holistic compressive strength of reinforcing tower section of thick bamboo, pack up anticorrosive glass fiber plastic layer in the outside behind the concrete layer shaping and fix through middle part ring component, it can install ring platform replacement when pouring to set up the ring groove on the ring component of middle part, the replacement inserts the glass fiber plastic layer of ring mounting in order to cramp the outer layer after pouring. After the layers are assembled, poured and wrapped, the top prefabricated tower barrel is assembled at the top end, and the integral installation of the fan tower barrel is completed.

Description

Combined anti-erosion semi-fabricated fan tower cylinder

Technical Field

The invention belongs to the technical field of wind power, and relates to a combined anti-erosion semi-fabricated fan tower cylinder.

Background

With the development of economic society, in recent years, the wind power industry is greatly developed by the nation, and the wind power generation is rapidly developed. The wind turbine tower cylinder is an important component of wind power generation equipment, at present, the wind turbine tower cylinder is mostly applied to a thin-wall round steel cylinder and a steel-concrete round tower cylinder (the upper part is the thin-wall round steel cylinder, and the lower part is concrete), for the tower with the length of more than 100 meters, the thin-wall round steel cylinder needs to meet the requirement of structural safety by increasing the size of a cross section or the thickness of a cylinder wall, and the wind turbine tower is limited by manufacturing process, transportation, materials and the like, so that the design is not economical, the design service life of the wind turbine tower is 25 years, and the steel cylinder is easy to corrode under the influence of strong sea wind to reduce the service life. The concrete tower drum of the steel-concrete circular tower drum is high in height, and the existing concrete tower drum is complex in manufacturing process and time-consuming, so that the production rate is greatly influenced; simultaneously, the torsional strength of current concrete tower section of thick bamboo itself is lower, and fan tower section of thick bamboo produces easily and rocks under the external wind-force interference, and then causes the fan slope, has influenced fan generated energy and later maintenance cost, and the concrete has the corrosion problem simultaneously under the long-term effect of solarization, rain, atmospheric pollution etc..

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a combined anti-erosion semi-fabricated fan tower cylinder, which solves the problems of shearing resistance and difficulty in transportation and hoisting by assembling a steel cylinder, is connected with a lower fan foundation by the assembling steel cylinder and is connected with an upper assembled thin-wall steel cylinder, increases the compressive strength of the fan tower cylinder by pouring concrete layers on the outer side layer by layer, enhances the integral corrosion resistance by wrapping a prestressed glass fiber plastic layer on the outer side, fixes and tightens each concrete layer and glass fiber layer by using a middle ring member and is convenient to install, and is stably connected with a top prefabricated tower cylinder by using the assembling type steel cylinder and the lower steel cylinder.

The invention provides a combined erosion-resistant semi-fabricated fan tower cylinder, which comprises: the semi-assembly type tower drum is installed on a fan foundation, the top prefabricated tower drum is installed on the semi-assembly type tower drum, and a power generation device of the fan is installed on the top prefabricated tower drum; the semi-assembly type tower drum is composed of an assembly steel drum, a concrete layer, glass fiber plastic layers and middle ring members, wherein the concrete layer is poured outside the assembly steel drum from bottom to top in a layered mode, the middle ring members are arranged between every two concrete layers, and one glass fiber plastic layer is bound outside each concrete layer.

In the combined anti-corrosion semi-fabricated fan tower cylinder, the fabricated steel cylinder comprises a plurality of steel cylinder long components and a plurality of steel cylinder short components, the steel cylinder long components and the steel cylinder short components are both composed of steel cylinder walls and fabricated rings, the four steel cylinder walls are fabricated into cylinders, and the two fabricated rings are spliced into circular rings; three assembling rings are arranged on the wall of the steel cylinder of the long steel cylinder component at equal intervals, two assembling rings are arranged on the short steel cylinder component at equal intervals, and the intervals of the assembling rings on the long steel cylinder component and the short steel cylinder component are equal; the bottom layer and the top layer of the assembled steel cylinder comprise two long steel cylinder components and two short steel cylinder components, and the long steel cylinder components and the short steel cylinder components are alternately assembled to form a steel cylinder structure of the bottom layer and the top layer; the middle part of the assembled steel cylinder adopts a staggered assembly mode of a plurality of steel cylinder long components to connect the bottom layer and the top layer of the assembled steel cylinder, and an assembly ring at the upper part of one steel cylinder long component is connected with an assembly ring at the middle part of an adjacent steel cylinder long component to realize staggered assembly; and a plurality of bolt holes are formed in the assembling ring, and the long steel cylinder component and the short steel cylinder component are fixed by penetrating prestressed bolts into the bolt holes after the assembly is finished.

In the combined anti-erosion semi-fabricated fan tower cylinder, pouring discs are arranged at the bottoms of two long steel cylinder components and two short steel cylinder components which form the bottom layer of an assembled steel cylinder, four pouring discs form a pouring disc after the bottom layer of the assembled steel cylinder is assembled, and a bottom concrete layer is poured on the pouring disc; the bottom layer of the assembly steel cylinder is connected with a fan foundation ring of a fan foundation through an assembly ring and a prestressed anchor bolt at the bottom of the assembly steel cylinder.

In the combined anti-erosion semi-fabricated fan tower cylinder, the pouring disc is provided with a circular groove, a circular fixing piece is installed in the circular groove after the bottom concrete layer is poured, and the bound glass fiber plastic layer is hooped by the circular fixing piece.

In the combined type erosion-resistant semi-fabricated fan tower cylinder, the middle ring component is formed by splicing two semi-circular rings through buckles, and a concrete layer is poured on the corresponding middle ring component; the top surface of middle part ring component is equipped with the ring groove, and concrete layer pours and installs the ring mounting in the ring groove after accomplishing, cramps the bottom of the glass fiber plastic layer on this layer through the ring mounting, the bottom surface of middle part ring component is equipped with the top that first cramping ring is used for cramping the glass fiber plastic layer of its lower floor.

In the combined type anti-erosion semi-fabricated fan tower cylinder, bolt holes are formed in the splicing positions of the two semi-circular rings of the middle circular ring component, and the middle circular ring component is fastened through connecting bolts after being connected through a buckle.

In the combined anti-erosion semi-fabricated fan tower cylinder, the bottom of the top prefabricated tower cylinder protrudes inwards to form a connecting ring, and the assembling ring on the top of the top layer of the assembling steel cylinder is fixedly connected with the connecting ring by adopting prestressed bolts.

In the combined type erosion-resistant semi-fabricated wind turbine tower, the bottom of the top prefabricated tower extends downwards to form a second clamping ring for clamping the top of the glass fiber plastic layer below the second clamping ring.

The combined erosion-resistant semi-fabricated fan tower cylinder provided by the invention at least has the following beneficial effects:

1. the fan tower cylinder provided by the invention is composed of a top prefabricated tower cylinder and a semi-assembly tower cylinder. The semi-assembly type tower barrel is composed of an assembly steel barrel, a concrete layer, a glass fiber plastic layer and a middle ring component, the assembly steel barrel and a top prefabricated tower barrel are of an assembly type structure, and operation such as pretreatment and cutting are conducted in a factory. The assembled steel cylinder is formed by assembling a long steel cylinder component and a short steel cylinder component layer by layer and then connecting the long steel cylinder component and the short steel cylinder component through an assembling ring inside the steel cylinder by using a prestressed bolt, the connection of horizontal transverse seams is enhanced by adopting a staggered assembly mode of a plurality of long steel cylinder components in the middle of the assembled steel cylinder, the problem of local stress concentration caused by staggered seams is solved, and the safety of the whole structure is further enhanced.

2. The bottom of the assembly steel cylinder is connected with the bottom of the assembly steel cylinder through 2 long steel cylinder components and 2 short steel cylinder components according to the corresponding height of the assembly ring, the thickness of the assembly ring of the bottom of the assembly steel cylinder is increased to serve as a part of wind power foundation flange ring, the assembly ring of the bottom of the assembly steel cylinder is connected with the whole wind power tower cylinder and a wind power generation foundation through a prestressed anchor bolt, and the wind power structure is more integral.

3. The formwork can be erected to pour concrete layers section by section in the assembling process of the steel cylinder, and the formwork can be erected more conveniently by the aid of the annular platform replacement parts arranged on the pouring disc and the middle annular member. The time of installing and carrying the concrete section by section is saved through the mode of half assembly, the pouring of the concrete can be simultaneously carried out when the assembly tower drum on the upper layer is installed so as to save the construction period, and the concrete layer is poured layer by layer outside the assembly steel drum so that the compressive strength of the whole fan tower drum is increased compared with that of a pure steel drum.

4. Glass Fiber Reinforced Plastic (GFRP) is a composite plastic which takes glass fiber reinforced unsaturated polyester, epoxy resin and phenolic resin as matrix materials. The material has the advantages of corrosion resistance, good electrical insulation property, slow heat transfer, good thermal insulation property, easy coloring and high tensile strength, and is suitable for being used as an outer layer material. Use prestressing force to make the glass fiber plastic layer parcel at a fan tower section of thick bamboo skin, can make a fan tower section of thick bamboo corrosion-resistant and heat-resisting more, the wealth of spraying material has been saved to its more colored characteristic, and in addition, glass fiber reinforced plastic's service life is about 45 to 50 years, is greater than the life of a aerogenerator tower section of thick bamboo far away, need not to change and can recycle.

5. Pour the concrete layer of every layer and use the ring mounting to fix the bottom of glass fiber plastic layer after the parcel glass fiber plastic layer to it is fixed with the top of glass fiber plastic layer through the first hoop ring of middle part ring member bottom surface, can prevent to drop and the concrete placement of the next stage of being more convenient for. The top surface of middle part ring component is equipped with the ring groove, can select to install the ring platform replacement according to the construction process and carry out concrete placement, pulls down the ring platform replacement after pouring and installs the ring mounting again and carry out the fixed of glass fiber plastic layer.

6. The semi-assembly type fan tower cylinder is far higher in overall strength than a thin-wall round steel cylinder, so that the cross section size and the cylinder wall thickness of the fan tower cylinder are smaller than those of the thin-wall round steel cylinder when the semi-assembly type fan tower cylinder is applied to engineering, and the semi-assembly type fan tower cylinder is more economical and reasonable. Because the assembly steel cylinder is composed of a plurality of steel cylinder long components and a plurality of steel cylinder short components, if the wind driven generator exceeds the service life, the assembly steel cylinder can still continue to work.

Drawings

FIG. 1 is a schematic view of the overall installation of a combined erosion resistant semi-fabricated wind turbine tower of the present invention;

FIG. 2 is a schematic diagram of the bottom structure of the assembled steel cylinder;

FIG. 3 is a schematic view of the connection of the bottom layer of the assembled steel cylinder with the wind power generation foundation;

FIG. 4a is a schematic diagram of the overall assembly of the assembled steel cylinder;

FIG. 4b is an enlarged view at A in FIG. 4 a;

FIG. 5 is an overall schematic view of the middle ring members when they are not connected;

FIG. 6 is a schematic view of a mid-ring element junction;

FIG. 7 is a cross-sectional view of a top prefabricated tower;

FIG. 8 is a schematic view of the construction of the ring mount;

FIG. 9 is a schematic illustration of a replacement annular platform;

FIG. 10 is a schematic view of the external pouring and assembling process after the steel cylinder is assembled;

fig. 11 is a force diagram of the assembled steel cylinder.

Wherein: 1-long steel cylinder component, 2-short steel cylinder component, 3-prestressed anchor bolt, 4-fan foundation ring, 5-concrete layer, 6-fiberglass plastic layer, 7-middle ring component, 71-buckle, 72-first clamping ring, 73-connecting bolt, 8-top prefabricated tower barrel, 81-connecting ring, 82-second clamping ring, 9-fan foundation, 10-power generation device, 101-assembling ring, 102-steel cylinder wall, 103-pouring disc, 104-bolt hole, 105-circular groove, 106-prestressed bolt, 107-circular ring fixing piece and 108-circular ring platform replacing piece.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the combined erosion resistant semi-fabricated wind turbine tower of the present invention comprises: the wind power generation device comprises a top prefabricated tower barrel 8 and a semi-assembly tower barrel, wherein the semi-assembly tower barrel is installed on a fan foundation 9, the top prefabricated tower barrel 8 is installed on the semi-assembly tower barrel, and a power generation device 10 of a fan is installed on the top prefabricated tower barrel 8; the semi-assembly tower cylinder comprises an assembly steel cylinder, a concrete layer 5, glass fiber plastic layers 6 and middle ring members 7, wherein the concrete layer 5 is poured outside the assembly steel cylinder from bottom to top in a layered mode, the middle ring members 7 are arranged between every two concrete layers, and the glass fiber plastic layers 6 are bound outside every two concrete layers.

As shown in fig. 2, 4a and 4b, the assembly steel cylinder includes a plurality of steel cylinder long members 1 and a plurality of steel cylinder short members 2, and the steel cylinder long members 1 and the steel cylinder short members 2 are both formed by a steel cylinder wall 102 and an assembly ring 101. Four steel cylinder walls 102 can be assembled into a cylinder, and two assembly rings 101 can be spliced into a circular ring. Three assembling rings 101 are arranged on the steel cylinder wall 102 of the long steel cylinder component 1 at equal intervals, two assembling rings 101 are arranged on the short steel cylinder component 2 at equal intervals, and the intervals of the assembling rings 101 on the long steel cylinder component 1 and the short steel cylinder component 2 are equal. The bottom layer and the top layer of the assembled steel cylinder comprise two long steel cylinder components 1 and two short steel cylinder components 2, the long steel cylinder components 1 and the short steel cylinder components 2 are alternately assembled to form a steel cylinder structure of the bottom layer and the top layer, namely the long steel cylinder components 1 are oppositely arranged, and the short steel cylinder components 2 are oppositely arranged to form the bottom layer and the top layer of the assembled steel cylinder. The middle part of the assembled steel cylinder adopts the dislocation assembly form of a plurality of steel cylinder long components 1 to connect the bottom layer and the top layer of the assembled steel cylinder, and during assembly, the assembly ring 101 at the upper part of one steel cylinder long component 1 is connected with the assembly ring 101 at the middle part of the adjacent steel cylinder long component 1 to realize the dislocation assembly. The assembling ring 101 is provided with a plurality of bolt holes 104, and the long steel cylinder member 1 and the short steel cylinder member 2 are fixed by penetrating prestressed bolts 106 into the bolt holes 104 after the assembling is completed.

As shown in fig. 3, the bottom parts of the two long steel cylinder members 1 and the two short steel cylinder members 2 which form the bottom layer of the assembled steel cylinder are provided with pouring discs, and the four pouring discs form a pouring disc 103 after the bottom layer of the assembled steel cylinder is assembled, so that subsequent formwork erection and glass fiber plastic layer binding and fixing are facilitated. The bottom concrete layer is poured on the pouring disc 103. The bottom layer of the assembly steel cylinder is connected with a fan foundation 4 in a fan foundation 9 in a ring mode through an assembly ring 103 and a prestressed anchor bolt 3 at the bottom of the assembly steel cylinder.

As shown in fig. 2, the pouring disc 103 is provided with a circular groove 105, after the bottom concrete layer is poured, a circular fixing member 107 is installed in the circular groove 105, and the bound glass fiber plastic layer 6 is banded by the circular fixing member 107. In fig. 3 the casting disc 103 has been fitted with a ring fixture 107.

As shown in fig. 5 and 6, the middle ring member 7 is formed by splicing two semicircular rings through a buckle 71, and the concrete layer 5 is poured on the corresponding middle ring member 7. The top surface of middle part ring component 7 also is equipped with ring groove 105, and installation ring mounting 107 in ring groove 105 after concrete layer pours the completion, cramps the bottom of the glass fiber plastic layer 6 on this layer through ring mounting 107, the bottom surface of middle part ring component 7 is equipped with first cramping ring 72 and is used for cramping the top of the glass fiber plastic layer 6 of its lower floor. Bolt holes are formed in the splicing positions of the two semicircular rings of the middle annular component 7, and the middle annular component 7 is fastened through the connecting bolts 73 after being connected through the buckles.

As shown in fig. 7, the bottom of the top prefabricated tower 8 protrudes inward to form a connection ring 81, and a hole is reserved on the connection ring 81. And a prestressed bolt 106 is adopted to fixedly connect the assembly ring 101 at the top of the top layer of the assembly steel cylinder with the connecting ring 81. The bottom of the top prefabricated tower 8 extends downwards to form a second hoop 82 for hooping the top of the glass fiber plastic layer 6 below the top prefabricated tower.

As shown in fig. 8, the bottom of the ring fixing member 107 is provided with a ring of annular protrusions, and a plurality of ring fixing members 107 are respectively installed in the corresponding annular grooves 105 of the middle ring member 7 or the pouring disc 103 through the annular protrusions at the bottom thereof.

Fig. 9 is a structural schematic diagram of the circular ring platform replacement 108, and a ring of annular protrusions are also arranged at the bottom of the circular ring platform replacement 108. Before the concrete layer is poured, the circular ring platform replacement part 108 is installed in the circular ring groove 105 of the middle circular ring member 7, so that the subsequent concrete layer formwork pouring is facilitated. After pouring is completed, the ring platform replacement part 108 is taken down and then the glass fiber plastic layer 6 is bound, and then the ring fixing part 107 is installed in the ring groove 105 to hoop the glass fiber plastic layer 6.

As shown in fig. 10, after the assembled steel cylinder is installed at a certain height, a concrete layer 5 is poured outside the assembled steel cylinder, a glass fiber plastic layer 6 is bound outside the concrete layer 5, the radius of the middle ring member 7 is prefabricated according to the radius of the glass fiber plastic layer 6, the middle ring member 7 of each layer is composed of two identical semicircular rings, and the assembled steel cylinder is formed by splicing and connecting buckles 71 at two ends of the semicircular rings during assembly.

The assembling process of the combined erosion-resistant semi-assembled fan tower cylinder comprises the following steps:

during construction, the steel cylinder long member 1 and the steel cylinder short member 2 which are prefabricated in a factory are respectively taken as two pieces, and the bottom layer is assembled by the four pieces of members according to the arrow direction of the figure 2 through the prestressed bolt 106. And the bottom layer of the steel cylinder assembly is connected with a fan foundation 9 by using a prestressed anchor bolt 3. After the bottom layer of the assembled steel cylinder is installed, the middle part of the assembled steel cylinder is spliced in a staggered mode through a plurality of steel cylinder long components 1, and then the steel cylinders are connected and assembled layer by layer.

After the concrete layer is assembled to a certain height layer by layer, the formwork supporting and the pouring of the concrete layer 5 are carried out on the pouring disc 103. The bottom can be supported according to a certain inclination angle and then poured. After pouring and forming, after the mould is unsealed, the glass plastic fiber which is subjected to custom coloring is made into a thin-wall layer, the inner side of the thin-wall layer is coated with a binder, and the thin-wall layer is tightly wrapped in a pouring concrete layer by using prestress to form a glass fiber plastic layer 6. After the glass fiber plastic layer 6 is bound, a ring fixing member 107 is installed on the casting disc 103 to hoop the lower end of the glass fiber plastic layer 6.

The middle disc member 7 is installed at the top of the poured concrete layer, two semicircular rings forming the middle disc member 7 are connected and assembled through a buckle 71, the lower portion of the middle disc member is fixed through a connecting bolt 73, and the top of the lower glass fiber plastic layer 6 can be hooped by a first hooping ring 72 on the bottom surface of the middle disc member 7. Before a concrete layer is poured, the circular ring platform replacement part 108 is installed above the middle circular ring member 7, after the upper assembling steel cylinder is installed to reach a certain height, formwork pouring and glass fiber plastic layer wrapping are continuously carried out on the middle circular ring member 7, after wrapping is completed, the circular ring platform replacement part 108 is detached, the circular ring fixing part 107 is installed, and the upper glass fiber plastic layer 6 is fixed until the top end of the steel cylinder is finished.

When the required height is reached, two steel cylinder long components 1 and two steel cylinder short components 2 are taken to complete the assembly of the top layer when the top layer is assembled. And then, pouring and installing the concrete layer 5 and the glass fiber plastic layer 6 on the top layer, forming a plane on the top layer, then installing the top prefabricated tower barrel 8, and connecting the top layer of the assembled steel barrel with the top prefabricated tower barrel 8 by using the prestressed bolts 106 to complete the installation of the tower barrel.

The working principle of the invention is as follows: as shown in FIG. 11, the wind turbine tower is subjected to substantially three forces: the dead weight stress Fy of the upper fan and the blades, the pneumatic thrust Fx of the air, and the torque My caused by uneven gravity of the upper structure and the air. The whole structure bears the self-weight stress Fy together, and the concrete layer can resist the influence of the self-weight stress Fy to a greater extent. Bear the most moment of torsion My by inside assembly steel cylinder, owing to used the form of stagger assembly, originally make the seam department only prestressed anchorage bolt bear Fx and moment of torsion receiving the aerodynamic thrust Fx of air, stress concentration destroys easily and leads to whole rupture. The structure of the invention ensures that the stress is not concentrated on the prestressed anchor bolt but is shared by the steel cylinder long member 1 and the steel cylinder short member 2, and the resistance provided by the structure can improve the torsional strength of the structure. The glass fiber plastic layer with strong tensile strength can resist the pneumatic thrust Fx of air to a greater extent, so that the wind power tower barrel combination can bear wind power with a greater degree and a wind power generator with a greater power.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined by the appended claims.

Claims (8)

1. The utility model provides a half assembled fan tower section of thick bamboo of combined anti erosion, its characterized in that includes: the semi-assembly type tower drum is installed on a fan foundation, the top prefabricated tower drum is installed on the semi-assembly type tower drum, and a power generation device of the fan is installed on the top prefabricated tower drum; the semi-assembly type tower drum is composed of an assembly steel drum, a concrete layer, glass fiber plastic layers and middle ring members, wherein the concrete layer is poured outside the assembly steel drum from bottom to top in a layered mode, the middle ring members are arranged between every two concrete layers, and one glass fiber plastic layer is bound outside each concrete layer.

2. The combined erosion resistant semi-fabricated wind turbine tower of claim 1, wherein the fabricated steel cans comprise a plurality of steel can long members and a plurality of steel can short members, both of which are comprised of steel can walls and mounting rings, four steel can walls are mounted into a cylinder, and two mounting rings are spliced into a ring; three assembling rings are arranged on the wall of the steel cylinder of the long steel cylinder component at equal intervals, two assembling rings are arranged on the short steel cylinder component at equal intervals, and the intervals of the assembling rings on the long steel cylinder component and the short steel cylinder component are equal; the bottom layer and the top layer of the assembled steel cylinder comprise two long steel cylinder components and two short steel cylinder components, and the long steel cylinder components and the short steel cylinder components are alternately assembled to form a steel cylinder structure of the bottom layer and the top layer; the middle part of the assembled steel cylinder adopts a staggered assembly mode of a plurality of steel cylinder long components to connect the bottom layer and the top layer of the assembled steel cylinder, and an assembly ring at the upper part of one steel cylinder long component is connected with an assembly ring at the middle part of an adjacent steel cylinder long component to realize staggered assembly; and a plurality of bolt holes are formed in the assembling ring, and the long steel cylinder component and the short steel cylinder component are fixed by penetrating prestressed bolts into the bolt holes after the assembly is completed.

3. The combined erosion resistant semi-fabricated wind turbine tower of claim 2, wherein pouring trays are provided at the bottoms of the two long members and the two short members of the steel cylinders forming the bottom layer of the fabricated steel cylinder, four pouring trays form a pouring disc after the bottom layer of the fabricated steel cylinder is fabricated, and a bottom concrete layer is poured on the pouring disc; the bottom layer of the assembly steel cylinder is connected with a fan foundation ring of a fan foundation through an assembly ring and a prestressed anchor bolt at the bottom of the assembly steel cylinder.

4. The combined type erosion resistant semi-fabricated wind turbine tower of claim 3, wherein the casting disc is provided with a circular groove, a circular fixing member is installed in the circular groove after the bottom concrete layer is cast, and the bound glass fiber plastic layer is hooped by the circular fixing member.

5. The combined erosion resistant semi-fabricated wind turbine tower of claim 1, wherein the middle annular member is formed by two semi-rings that are joined together by a snap fit, and a concrete layer is cast over the respective middle annular member; the top surface of middle part ring component is equipped with the ring groove, and concrete layer pours and installs the ring mounting in the ring groove after accomplishing, cramps the bottom of the glass fiber plastic layer on this layer through the ring mounting, the bottom surface of middle part ring component is equipped with the top that first cramping ring is used for cramping the glass fiber plastic layer of its lower floor.

6. The combined erosion resistant semi-fabricated wind turbine tower of claim 5, wherein bolt holes are formed at the splicing of the two semi-circular rings of the middle circular ring member, and the middle circular ring member is fastened by connecting bolts after being connected by a buckle.

7. The combined erosion resistant semi-fabricated wind turbine tower of claim 2, wherein the bottom of the top prefabricated tower protrudes inward to form a connection ring, and the assembly ring at the top of the top layer of the assembly steel cylinder is fixedly connected with the connection ring by using prestressed bolts.

8. The modular erosion resistant semi-fabricated wind turbine tower of claim 7, wherein the bottom of the top prefabricated tower extends downward to form a second hoop for hooping the top of the underlying fiberglass plastic layer.

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