A combined tower structure for a wind turbine

Abstract

The present invention provides a combined tower structure for a wind turbine unit, which includes four steel columns, four connecting steel pipes, four supporting steel pipes, a steel platform connecting member and a steel tower barrel. The steel tower barrel is installed on the steel platform connecting member. The upper ends of the four connecting steel pipes can respectively pass through the lower openings of the steel platform connecting member and extend into the cavity of the steel platform connecting member, and the four connecting steel pipes can be respectively connected to the steel platform connecting member; the upper ends of the four steel columns can be respectively connected corresponding to the lower ends of the four supporting steel pipes, and the four connecting steel pipes can be respectively in telescopic fit with the four supporting steel pipes; in the transportation state, each connecting steel pipe is correspondingly contracted in each supporting steel pipe; in the installation state, each connecting steel pipe extends out of each supporting steel pipe respectively, and the lower ends of each connecting steel pipe are respectively connected corresponding to the upper ends of each supporting steel pipe. The present invention can solve the problems of inconvenient transportation of the support members of the existing wind turbine tower and relatively high transportation cost.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power, and particularly to a combined tower structure for a wind turbine generator set. Background Art

[0002] In a wind power project, a wind turbine tower is a support structure of a wind power generating set, and its main function is to support the weight of the generating set and convert wind energy into electrical energy. The height of the wind turbine tower needs to be determined according to the size of the wind turbine and the expected wind energy resources, and can reach dozens of meters or even hundreds of meters. With the rapid development of wind turbines, the wind turbine tower needs to have greater height, stiffness and strength, resulting in an increasing size of the traditional wind turbine tower, and the supporting rods forming the wind turbine tower are getting longer. Such large-sized supporting rods are not only inconvenient to transport, but also have a high transportation cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a combined tower structure for a wind turbine generator set, which can solve the problems of inconvenient transportation and high transportation cost of the supporting rods of the existing wind turbine tower.

[0004] The present invention provides a combined tower structure for a wind turbine generator set, including four steel columns, four connecting steel pipes, four supporting steel pipes, a steel platform connecting member and a steel tower barrel. The steel platform connecting member is a rectangular box structure with an open lower end. The steel tower barrel is installed on the steel platform connecting member. The upper ends of the four connecting steel pipes can respectively pass through the open lower end of the steel platform connecting member and extend into the cavity of the steel platform connecting member, and the four connecting steel pipes are respectively connected to the steel platform connecting member. The upper ends of the four steel columns can be respectively connected to the lower ends of the four supporting steel pipes correspondingly. The four connecting steel pipes can be respectively in telescopic cooperation with the four supporting steel pipes correspondingly. In the transportation state, each connecting steel pipe is correspondingly contracted in each supporting steel pipe. In the installation state, each connecting steel pipe extends out of each supporting steel pipe respectively, and the lower ends of each connecting steel pipe are respectively connected to the upper ends of each supporting steel pipe correspondingly.

[0005] According to a combined tower structure for a wind turbine generator set provided by the present invention, a first outer connecting flange is fixedly arranged at the lower end outside the connecting steel pipe, and a plurality of first connecting bolts are fixedly arranged on the first outer connecting flange. A first inner connecting flange is fixedly arranged at the upper end inside the supporting steel pipe, and a plurality of first connecting holes are arranged on the first inner connecting flange. The first outer connecting flange is arranged inside the supporting steel pipe, and the first outer connecting flange can be in sliding cooperation with the inner side wall of the supporting steel pipe. The upper end of the connecting steel pipe extends out of the supporting steel pipe. In the installation state, the upper end surface of the first outer connecting flange is correspondingly matched with the lower end surface of the first inner connecting flange, and each first connecting bolt respectively passes through each first connecting hole and is fastened by a first connecting nut.

[0006] According to a combined tower structure for a wind turbine provided by the present invention, each of the steel columns is sequentially connected from bottom to top by a plurality of telescopic steel pipe assemblies. Each telescopic steel pipe assembly includes an outer steel column connection section and an inner steel column connection section. In the transportation state, the inner steel column connection section is contracted within the outer steel column connection section; in the installation state, the inner steel column connection section extends out of the outer steel column connection section, and the lower end of the inner steel column connection section is connected to the upper end of the outer steel column connection section.

[0007] According to a combined tower structure for a wind turbine provided by the present invention, a second outer connection flange is fixedly provided at the lower outer side of the inner steel column connection section, and a plurality of second connection bolts are fixedly provided on the second outer connection flange; a second inner connection flange is fixedly provided at the upper inner side of the outer steel column connection section, and a plurality of second connection holes are provided on the second inner connection flange; the second outer connection flange is disposed within the outer steel column connection section, and the second outer connection flange can be slidably matched with the inner side wall of the outer steel column connection section. The upper end of the inner steel column connection section extends out of the outer steel column connection section; in the installation state, the upper end surface of the second outer connection flange corresponds to and cooperates with the lower end surface of the second inner connection flange, and each of the second connection bolts passes through each of the second connection holes and is tightened by a second connection nut.

[0008] According to a combined tower structure for a wind turbine provided by the present invention, the support steel pipe is connected to the inner steel column connection section of the telescopic steel pipe assembly located at the uppermost end. A third outer connection flange is fixedly provided at the upper outer side of the inner steel column connection section, and a fourth outer connection flange adapted to the third outer connection flange is fixedly provided at the lower outer side of the support steel pipe; in the installation state, the third outer connection flange and the fourth outer connection flange are connected by a plurality of third connection bolts.

[0009] According to a combined tower structure for a wind turbine provided by the present invention, the outer steel column connection section is a square steel pipe, and the inner steel column connection section is a square steel pipe adapted to the outer steel column connection section.

[0010] According to a combined tower structure for a wind turbine provided by the present invention, the connecting steel pipe is a square steel pipe, and the support steel pipe is a square steel pipe adapted to the connecting steel pipe; the steel platform connecting member is surrounded by a top plate and four side plates. The four connecting steel pipes respectively correspond to the four corner positions of the steel platform connecting member; wherein two adjacent side plates are vertically connected so that the outer side wall of the connecting steel pipe can be closely arranged with the four corner positions of the steel platform connecting member.

[0011] According to a combined tower structure for a wind turbine provided by the present invention, a plurality of side plate connection through holes are respectively provided at positions corresponding to the connecting steel pipes on the right side of each side plate, and the plurality of side plate connection through holes are sequentially arranged at intervals along the height direction of the side plate; a plurality of side plate connection bolts corresponding to the side plate connection through holes are provided on each connecting steel pipe, each side plate connection bolt respectively penetrates through the connecting steel pipe, and after each side plate connection bolt correspondingly passes through each side plate connection through hole, it is fastened by a side plate connection nut.

[0012] According to a combined tower structure for a wind turbine provided by the present invention, four top plate connection flanges are fixedly provided at the bottom of the top plate, and steel pipe connection flanges are respectively provided at the upper inner ends of the connecting steel pipes, each steel pipe connection flange corresponds to each top plate connection flange one by one, and the corresponding steel pipe connection flange and the top plate connection flange are connected by top plate connection bolts.

[0013] According to a combined tower structure for a wind turbine provided by the present invention, a tower barrel connection flange is fixedly provided at the top of the top plate, and a steel tower barrel flange is fixedly provided at the bottom of the steel tower barrel, and the tower barrel connection flange and the steel tower barrel flange are connected by a plurality of tower barrel connection bolts.

[0014] The combined tower structure for a wind turbine provided by the present invention is provided with four steel columns, four connecting steel pipes, four support steel pipes, a steel platform connecting member and a steel tower barrel, wherein the steel platform connecting member is arranged as a rectangular box structure with an open lower end, the steel tower barrel is installed on the steel platform connecting member, the upper ends of the four connecting steel pipes respectively pass through the open lower end of the steel platform connecting member and extend into the cavity of the steel platform connecting member, and the four connecting steel pipes are respectively connected with the steel platform connecting member; the upper ends of the four steel columns are respectively connected corresponding to the lower ends of the four support steel pipes. Since the four connecting steel pipes can be telescopically matched with the four support steel pipes correspondingly, in the transportation state, each connecting steel pipe can be correspondingly contracted into each support steel pipe, with a smaller size, reducing the floor area and being convenient for transportation; in the installation state, each connecting steel pipe can respectively extend out of each support steel pipe, and the lower ends of the connecting steel pipes are respectively connected corresponding to the upper ends of the support steel pipes, so as to realize the extended installation between the connecting steel pipe and the support steel pipe, with convenient assembly and reliable connection. Thus, the combined tower structure for a wind turbine provided by the present invention can solve the problem of inconvenient transportation of the support members of the existing wind turbine tower, and effectively reduce the transportation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of the combined tower structure for a wind turbine unit of the present invention;

[0017] Figure 2 It is a connection diagram of the connecting steel pipe and the steel platform connecting member in the combined tower structure for a wind turbine unit of the present invention;

[0018] Figure 3 It is a schematic diagram of the contracted state of the connecting steel pipe and the supporting steel pipe in the combined tower structure for a wind turbine unit of the present invention;

[0019] Figure 4 It is a schematic diagram of the installed state of the connecting steel pipe and the supporting steel pipe in the combined tower structure for a wind turbine unit of the present invention;

[0020] Figure 5 It is a schematic diagram of the contracted state of the telescopic steel pipe assembly in the combined tower structure for a wind turbine unit of the present invention;

[0021] Figure 6 It is a schematic diagram of the installed state of the telescopic steel pipe assembly in the combined tower structure for a wind turbine unit of the present invention;

[0022] Figure 7 It is a schematic diagram of the installed state of the steel column and the supporting steel pipe in the combined tower structure for a wind turbine unit of the present invention;

[0023] Figure 8 It is the front view of the steel platform connecting member in the combined tower structure for a wind turbine unit of the present invention;

[0024] Figure 9 It is the top view of the steel platform connecting member in the combined tower structure for a wind turbine unit of the present invention;

[0025] Figure 10 It is the bottom view of the steel platform connecting member in the combined tower structure for a wind turbine unit of the present invention.

[0026] Explanation of reference numerals:

[0027] 1. Steel column; 101. Outer steel column connection section; 102. Inner steel column connection section; 103. Second outer connection flange; 104. Second connection bolt; 105. Second inner connection flange; 106. Third outer connection flange; 107. Third connection bolt; 108. Fifth outer connection flange; 109. Fourth connection bolt;

[0028] 2. Connecting steel pipe; 201. First outer connection flange; 202. First connection bolt; 203. Steel pipe connection flange;

[0029] 3. Supporting steel pipe; 301. First inner connection flange; 302. Fourth outer connection flange;

[0030] 4. Steel platform connector; 401. Top plate; 402. Side plate; 403. Side plate connection through hole; 404. Top plate connection flange; 405. Tower barrel connection flange;

[0031] 5. Steel tower barrel; 501. Steel tower barrel flange;

[0032] 6. Side plate connection bolt; 7. Machine nacelle; 8. Hub; 9. Wind turbine blade. Specific embodiments

[0033] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0035] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined. In addition, the terms "mounted", "connected", and "coupled" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] As Figures 1 to 10 shown, the combined tower structure for a wind turbine according to an embodiment of the present invention includes four steel columns 1, four connecting steel pipes 2, four support steel pipes 3, a steel platform connector 4, and a steel tower barrel 5. The steel platform connector 4 is a rectangular box structure with an open lower end. The steel tower barrel 5 is mounted on the steel platform connector 4. The upper ends of the four connecting steel pipes 2 can respectively pass through the open lower end of the steel platform connector 4 and extend into the cavity of the steel platform connector 4, and the four connecting steel pipes 2 are respectively connected to the steel platform connector 4. Among them, the upper ends of the four steel columns 1 can respectively be correspondingly connected to the lower ends of the four support steel pipes 3, and the four connecting steel pipes 2 can respectively be in telescopic fit with the four support steel pipes 3.

[0037] In the transportation state, each connecting steel pipe 2 can correspondingly contract into each support steel pipe 3, so the size is smaller, the floor area is reduced, and it is convenient for transportation.

[0038] In the installation state, each connecting steel pipe 2 can respectively extend out of each support steel pipe 3, and the lower ends of the four connecting steel pipes 2 are respectively correspondingly connected to the upper ends of the four support steel pipes 3, so as to realize the extended installation between the connecting steel pipe 2 and the support steel pipe 3, which is convenient for assembly and has reliable connection.

[0039] Therefore, the combined tower structure for a wind turbine unit according to the embodiments of the present invention can solve the problem of inconvenient transportation of the support members of the existing wind turbine tower, and effectively reduce the transportation cost. At the same time, the combined tower structure for a wind turbine unit according to the embodiments of the present invention is provided with four steel columns 1, four connecting steel pipes 2 and four support steel pipes 3, so that the corresponding steel columns 1, connecting steel pipes 2 and support steel pipes 3 are connected in sequence. Then, each connecting steel pipe 2 is respectively connected to the steel platform connecting member 4, thereby forming a quadrilateral lattice steel tower structure. And by installing the steel tower barrel 5 on the steel platform connecting member 4, a combined support structure form combining the upper steel tower barrel structure and the lower quadrilateral lattice steel tower structure is formed. It can not only meet the requirements of the support structure of the wind turbine unit for height, stiffness and strength, and meet the bearing capacity of the wind turbine unit, but also has a simple and reasonable structure, effectively reducing the steel consumption and the cost.

[0040] In some embodiments of the present invention, a first outer connection flange 201 is fixedly provided at the lower end outside the connecting steel pipe 2, and a plurality of first connection bolts 202 are fixedly provided on the first outer connection flange 201. A first inner connection flange 301 is fixedly provided at the upper end inside the support steel pipe 3, and a plurality of first connection holes are provided on the first inner connection flange 301. The first outer connection flange 201 is arranged inside the support steel pipe 3, and the first outer connection flange 201 can be slidably matched with the inner side wall of the support steel pipe 3. The upper end of the connecting steel pipe 2 extends out of the support steel pipe 3. Therefore, in the installation state, the connecting steel pipe 2 is pulled out from the support steel pipe 3, and then the upper end surface of the first outer connection flange 201 is correspondingly matched with the lower end surface of the first inner connection flange 301. And each first connection bolt 202 is respectively passed through each first connection hole and then fastened by a first connection nut. Since the first connection bolts 202 are fixedly provided on the first outer connection flange 201, when installing between the connecting steel pipe 2 and the support steel pipe 3, there is no need to separately install connection bolts for connecting the first outer connection flange 201 and the first inner connection flange 301. Only when the connecting steel pipe 2 extends out of the support steel pipe 3, each first connection bolt 202 is correspondingly passed through each first connection hole, and then each first connection bolt 202 is respectively fastened by a first connection nut. The installation construction is convenient, effectively improving the construction efficiency.

[0041] Among them, the connecting steel pipe 2 is a square steel pipe, and the support steel pipe 3 is a square steel pipe adapted to the connecting steel pipe 2. Thus, when the connecting steel pipe 2 and the support steel pipe 3 are cooperatively extended, a limiting effect can be achieved. When the connecting steel pipe 2 is extended out of the support steel pipe 3, each first connection bolt 202 can directly pass through the corresponding first connection holes without further adjustment, and the operation is convenient.

[0042] In some embodiments of the present invention, each steel column 1 is sequentially connected from bottom to top by a plurality of telescopic steel pipe components. Each telescopic steel pipe component includes an outer steel column connection section 101 and an inner steel column connection section 102. In the transportation state, the inner steel column connection section 102 contracts inside the outer steel column connection section 101. Therefore, the size of the steel column 1 after contraction is smaller, reducing the floor area and facilitating transportation, and further reducing the transportation cost. In the installation state, the inner steel column connection section 102 extends out of the outer steel column connection section 101, and the lower end of the inner steel column connection section 102 is connected to the upper end of the outer steel column connection section 101, thereby realizing the extended installation of the telescopic steel pipe component, with convenient assembly and reliable connection.

[0043] Specifically, a second outer connection flange 103 is fixedly provided at the lower outer side of the inner steel column connection section 102, and a plurality of second connection bolts 104 are fixedly provided on the second outer connection flange 103. A second inner connection flange 105 is fixedly provided at the upper inner side of the outer steel column connection section 101, and a plurality of second connection holes are provided on the second inner connection flange 105. The second outer connection flange 103 is disposed inside the outer steel column connection section 101, and the second outer connection flange 103 can be slidably matched with the inner side wall of the outer steel column connection section 101. The upper end of the inner steel column connection section 102 extends out of the outer steel column connection section 101. In the installation state, the upper end face of the second outer connection flange 103 is correspondingly matched with the lower end face of the second inner connection flange 105, and each second connection bolt 104 respectively passes through each second connection hole and is fastened by a second connection nut, thereby realizing a reliable extended assembly between the inner steel column connection section 102 and the outer steel column connection section 101. Since the second connection bolts 104 are fixedly provided on the second outer connection flange 103, during installation, there is no need to separately install connection bolts for connecting the second outer connection flange 103 and the second inner connection flange 105. Only need to dock the second outer connection flange 103 and the second inner connection flange 105 and make each second connection bolt 104 correspondingly pass through each second connection hole, and then respectively fasten each second connection bolt 104 by a second connection nut. The installation construction is convenient, effectively improving the construction efficiency.

[0044] Among them, the outer steel column connection section 101 is a square steel pipe, and the inner steel column connection section 102 is a square steel pipe adapted to the outer steel column connection section 101. Therefore, when the inner steel column connection section 102 and the outer steel column connection section 101 are cooperatively extended, a limiting effect can be achieved. When the inner steel column connection section 102 extends out of the outer steel column connection section 101, each second connection bolt 104 can directly pass through the corresponding second connection hole without further adjustment, and the operation is convenient.

[0045] Specifically, a third outer connection flange 106 is fixedly provided at the upper outer side of each inner steel column connection section 102. When connecting the support steel pipe 3 to the steel column 1, the support steel pipe 3 is connected to the inner steel column connection section 102 in the uppermost telescopic steel pipe assembly. A fourth outer connection flange 302 adapted to the third outer connection flange 106 is fixedly provided at the lower outer side of the support steel pipe 3. Therefore, in the installation state, the third outer connection flange 106 and the fourth outer connection flange 302 are butted, and then connected by a plurality of third connection bolts 107.

[0046] Specifically, a fifth outer connection flange 108 is fixedly provided at the lower outer side of each outer steel column connection section 101. Since a third outer connection flange 106 is fixedly provided at the upper outer side of each inner steel column connection section 102, when connecting two adjacent telescopic steel pipe assemblies up and down, the fifth outer connection flange 108 in the upper telescopic steel pipe assembly is butted with the third outer connection flange 106 in the lower telescopic steel pipe assembly, and then connected by a fourth connection bolt 109.

[0047] Since it is necessary to connect the outer steel column connection section 101 in the upper telescopic steel pipe assembly to the inner steel column connection section 102 in the lower telescopic steel pipe assembly during the installation of two adjacent telescopic steel pipe assemblies up and down, the sizes of the respective telescopic steel pipe assemblies arranged in sequence from bottom to top are correspondingly reduced in sequence.

[0048] In some embodiments of the present invention, the steel platform connector 4 is enclosed by a top plate 401 and four side plates 402. The four connecting steel pipes 2 respectively correspond to the four corner positions of the steel platform connector 4 to make the installation more stable and reliable. The length of each connecting steel pipe 2 is greater than the height of the steel platform connector 4. Two adjacent side plates 402 are vertically connected, so that the outer side walls of the square connecting steel pipes 2 can be attached to the four corner positions of the steel platform connector 4, thereby facilitating the reliable connection and fixation between the connecting steel pipes 2 and the steel platform connector 4.

[0049] Specifically, a plurality of side plate connection through holes 403 are respectively provided at the positions corresponding to the connecting steel pipes 2 on the right side of each side plate 402. The plurality of side plate connection through holes 403 are sequentially arranged at intervals along the height direction of the side plate 402. A plurality of side plate connection bolts 6 corresponding to the side plate connection through holes 403 are detachably provided on each connecting steel pipe 2. Each side plate connection bolt 6 penetrates through the connecting steel pipe 2, and each side plate connection bolt 6 passes through the corresponding side plate connection through hole 403 and is fastened by a side plate connection nut. That is, each connecting steel pipe 2 is bolt-connected to the corresponding side plate 402 on the steel platform connector 4, thereby improving the stability and reliability after the connection between the connecting steel pipe 2 and the steel platform connector 4, and further improving the overall structural strength of the quadrilateral lattice steel tower.

[0050] Specifically, four roof connection flanges 404 are fixedly arranged at the bottom of the roof 401. Steel pipe connection flanges 203 are respectively arranged at the upper inner sides of the connecting steel pipes 2. The steel pipe connection flanges 203 respectively correspond to the roof connection flanges 404 one by one, and the corresponding steel pipe connection flanges 203 and roof connection flanges 404 are connected by roof connection bolts. That is to say, the tops of the connecting steel pipes 2 are respectively bolt-connected to the roof 401 of the steel platform connector 4, thereby further improving the stability and reliability after the connection between the connecting steel pipe 2 and the steel platform connector 4, and further improving the overall structural strength of the quadrilateral lattice steel tower.

[0051] Specifically, a tower barrel connection flange 405 is fixedly arranged at the top of the roof 401, and a tower barrel flange 501 is fixedly arranged at the bottom of the steel tower barrel 5. The tower barrel connection flange 405 and the tower barrel flange 501 are connected by a plurality of tower barrel connection bolts, thereby realizing the reliable connection and fixation between the steel tower barrel 5 and the steel platform connector 4.

[0052] In some embodiments of the present invention, a nacelle 7 is installed at the upper end of the steel tower barrel 5, a hub 8 is installed on the nacelle 7, and a wind turbine blade 9 is installed on the hub 8, thereby realizing the reliable support for the wind turbine unit.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combined tower structure for a wind turbine unit, characterized in that, It includes four steel columns, four connecting steel pipes, four supporting steel pipes, a steel platform connecting piece, and a steel tower barrel. The steel platform connecting piece is a rectangular box structure with an open lower end. The steel tower barrel is installed on the steel platform connecting piece. The upper ends of the four connecting steel pipes can respectively pass through the open lower end of the steel platform connecting piece and extend into the cavity of the steel platform connecting piece, and the four connecting steel pipes are respectively connected to the steel platform connecting piece; the upper ends of the four steel columns can be respectively connected to the lower ends of the four supporting steel pipes correspondingly. The four connecting steel pipes can be respectively in telescopic fit with the four supporting steel pipes; in the transportation state, each connecting steel pipe correspondingly contracts into each supporting steel pipe; in the installation state, each connecting steel pipe extends out of each supporting steel pipe respectively, and the lower ends of each connecting steel pipe are respectively connected to the upper ends of each supporting steel pipe correspondingly. The connecting steel pipe is a square steel pipe, and the supporting steel pipe is a square steel pipe adapted to the connecting steel pipe; the steel platform connecting piece is enclosed by a top plate and four side plates. The four connecting steel pipes respectively correspond to the four corner positions of the steel platform connecting piece; where two adjacent side plates are vertically connected, so that the outer side wall of the connecting steel pipe can be arranged in fit with the four corner positions of the steel platform connecting piece. At the position corresponding to the connecting steel pipe on the right side of each side plate, a plurality of side plate connection through holes are respectively provided, and the plurality of side plate connection through holes are sequentially arranged at intervals along the height direction of the side plate; on each connecting steel pipe, a plurality of side plate connection bolts corresponding to the side plate connection through holes are provided. Each side plate connection bolt respectively penetrates through the connecting steel pipe, and after each side plate connection bolt correspondingly passes through each side plate connection through hole, it is fastened by a side plate connection nut.

2. The combined tower structure for a wind turbine unit according to claim 1, characterized in that, A first outer connection flange is fixedly arranged at the outer lower end of the connecting steel pipe, and a plurality of first connection bolts are fixedly arranged on the first outer connection flange; a first inner connection flange is fixedly arranged at the inner upper end of the supporting steel pipe, and a plurality of first connection holes are provided on the first inner connection flange; the first outer connection flange is arranged inside the supporting steel pipe, and the first outer connection flange can be in sliding fit with the inner side wall of the supporting steel pipe. The upper end of the connecting steel pipe extends out of the supporting steel pipe; in the installation state, the upper end surface of the first outer connection flange corresponds to and cooperates with the lower end surface of the first inner connection flange, and each first connection bolt respectively passes through each first connection hole and is fastened by a first connection nut.

3. The combined tower structure for a wind turbine unit according to claim 2, characterized in that, Each steel column is sequentially connected by a plurality of telescopic steel pipe components from bottom to top. Each telescopic steel pipe component includes an outer steel column connection section and an inner steel column connection section. In the transportation state, the inner steel column connection section contracts into the outer steel column connection section; in the installation state, the inner steel column connection section extends out of the outer steel column connection section, and the lower end of the inner steel column connection section is connected to the upper end of the outer steel column connection section.

4. The combined tower structure for a wind turbine unit according to claim 3, characterized in that, A second outer connection flange is fixedly provided at the lower outer end of the inner steel column connection section, and a plurality of second connection bolts are fixedly provided on the second outer connection flange; a second inner connection flange is fixedly provided at the upper inner end of the outer steel column connection section, and a plurality of second connection holes are provided on the second inner connection flange; the second outer connection flange is arranged inside the outer steel column connection section, and the second outer connection flange can be slidably matched with the inner side wall of the outer steel column connection section, and the upper end of the inner steel column connection section extends outside the outer steel column connection section; in the installation state, the upper end surface of the second outer connection flange corresponds and cooperates with the lower end surface of the second inner connection flange, and each of the second connection bolts respectively passes through each of the second connection holes and is tightened by a second connection nut.

5. The combined tower structure for a wind turbine unit according to claim 4, characterized in that, The support steel pipe is connected to the inner steel column connection section of the uppermost telescopic steel pipe assembly. A third outer connection flange is fixedly provided at the upper outer end of the inner steel column connection section, and a fourth outer connection flange adapted to the third outer connection flange is fixedly provided at the lower outer end of the support steel pipe; in the installation state, the third outer connection flange and the fourth outer connection flange are connected by a plurality of third connection bolts.

6. The combined tower structure for a wind turbine unit according to claim 3, characterized in that, The outer steel column connection section is a square steel pipe, and the inner steel column connection section is a square steel pipe adapted to the outer steel column connection section.

7. The combined tower structure for a wind turbine unit according to claim 1, characterized in that Four roof connection flanges are fixedly provided at the bottom of the roof. Steel pipe connection flanges are respectively provided at the upper inner ends of the connection steel pipes. Each of the steel pipe connection flanges corresponds to each of the roof connection flanges one by one, and the corresponding steel pipe connection flange and the roof connection flange are connected by roof connection bolts.

8. The combined tower structure for a wind turbine unit according to claim 1, characterized in that, A tower barrel connection flange is fixedly provided at the top of the roof, and a steel tower barrel flange is fixedly provided at the bottom of the steel tower barrel. The tower barrel connection flange and the steel tower barrel flange are connected by a plurality of tower barrel connection bolts.

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