Prestress system of mixed tower foundation and construction method thereof

Abstract

The invention provides a mixed tower foundation prestress system and a construction method thereof, and relates to the field of mixed tower installation, the mixed tower foundation prestress system comprises a plurality of anchor bearing plates, the anchor bearing plates are evenly distributed in the circumferential direction of a foundation inner cavity mold, the anchor bearing plates are fixedly installed on a foundation inner cavity middle mold, and insertion holes are formed in the anchor bearing plates; the multiple supporting pipes correspond to the multiple anchor bearing plates one to one, the supporting pipes are located on the outer side of the foundation inner cavity upper mold and are perpendicular to the foundation inner cavity middle mold, and one ends of the supporting pipes are inserted into the insertion holes of the corresponding anchor bearing plates; the multiple grouting groove molds correspond to the multiple supporting pipes one to one, the grouting groove molds are installed at the ends, away from the anchor bearing plate, of the supporting pipes, the multiple grouting groove molds are spliced to form an annular structure, and the supporting pipes are located in the annular structure; and the connecting assembly is arranged between the supporting pipe and the grouting groove mold and is used for adjustably mounting the grouting groove mold on the supporting pipe. The construction method has the effect of improving the construction efficiency of the mixed tower foundation.

Description

Technical Field

[0001] This application relates to the field of mixed tower installation technology, and in particular to a prestressed system for mixed tower foundations and its construction method. Background Technology

[0002] Based on the current development status of the wind power market, the market demand for turbines that can be used in low-wind-speed plains is increasing. The form of wind turbine towers is also evolving from traditional pure steel tower structures to steel-concrete structures, and the wind turbine foundations are also being upgraded from solid circular extended wind turbine foundations to hollow structures.

[0003] The hybrid tower type wind turbine foundation is a circular independent extended hollow foundation. The exterior is a cylindrical concrete foundation with equal slopes, and the interior has a tension chamber with a hollow structure. The foundation is cantilevered, and the wind turbine tower and foundation are connected by prestressed anchor cables.

[0004] The traditional method of installing and fixing the prestressed system within a hybrid tower foundation involves setting up a theodolite at the center point of the foundation to measure and verify each bottom anchor plate and upper duct support pipe. The bottom anchor plates are then fixed with adhesive, and the upper duct support pipes are welded to the foundation reinforcement cage. This method of fixing the anchor plates makes them prone to displacement during rebar tying and concrete pouring. Furthermore, welding the upper duct support pipes can damage the reinforcement cage, resulting in high labor costs and a long installation and verification cycle, severely impacting the construction quality and schedule of the wind turbine foundation. Summary of the Invention

[0005] In order to overcome the technical problems described in the prior art, this application provides a prestressed system for hybrid tower foundations and its construction method.

[0006] Firstly, this application provides a prestressed system for a mixed-structure tower foundation, which adopts the following technical solution: A prestressed system for a mixed-structure tower foundation is installed on the inner cavity mold of the wind turbine foundation, including... Anchor plates are provided in multiple ways. The multiple anchor plates are evenly distributed along the circumference of the inner cavity mold of the foundation. The anchor plates are fixedly installed on the inner cavity mold of the foundation. Insertion holes are provided on the anchor plates. Multiple support tubes are provided, each corresponding to a different anchor plate. The support tubes are located outside the upper mold of the foundation cavity and perpendicular to the middle mold of the foundation cavity. One end of the support tube is inserted into the corresponding hole of the anchor plate. Multiple grouting trench molds are provided, each corresponding to a specific support pipe. The grouting trench mold is installed on the end of the support pipe furthest from the anchor plate. Multiple grouting trench molds are spliced ​​together to form a ring structure, with the support pipe located within the ring structure. A connecting assembly is disposed between the support pipe and the grouting trench mold, and is used to adjustably install the grouting trench mold onto the support pipe.

[0007] Furthermore, the connecting assembly includes an L-shaped connecting plate, multiple fixing bolts, and iron wire. The L-shaped connecting plate is inverted and positioned above the grouting trench mold. One end is detachably connected to the side wall of the grouting trench mold via multiple fixing bolts, and the other end is bound to the support pipe via iron wire. One end of the L-shaped connecting plate has multiple fixing holes for iron wire to pass through, and the other end has a waist hole for fixing bolts to pass through. The side wall of the grouting trench mold has threaded holes for the fixing bolts to be threaded.

[0008] Furthermore, the L-shaped connecting plate has a slot on the side wall near the support tube that is compatible with the support tube.

[0009] Furthermore, side plates are provided on both sides of the L-shaped connecting plate, and the side plates are fixedly connected between the two panels of the L-shaped connecting plate.

[0010] Furthermore, baffles are fixed at both ends of the grouting trench mold, and connecting bolts are provided between two adjacent grouting trench molds to connect the two close-to-each baffles together.

[0011] Furthermore, a through hole is provided on the bottom wall of the grouting trench mold, and a limit anchor is installed in the through hole of the grouting trench mold.

[0012] Furthermore, the insertion hole is provided with a sealing element for sealing the connection between the support tube and the anchor plate.

[0013] Secondly, this application provides a construction method for a prestressed composite tower foundation system, which, based on the aforementioned prestressed composite tower foundation system, includes the following steps: S1. The foundation inner cavity mold is assembled and installed on the wind turbine foundation pad layer. First, the lower foundation inner cavity mold is enclosed to form a cylinder and vertically installed on the wind turbine foundation pad layer. Then, the middle foundation inner cavity mold is installed on the top of the lower foundation inner cavity mold, so that the middle foundation inner cavity mold is perpendicular to the lower foundation inner cavity mold and forms a ring structure on the inner side of the top of the lower foundation inner cavity mold. Finally, the upper foundation inner cavity mold is vertically installed above the middle foundation inner cavity mold, and the upper foundation inner cavity mold is enclosed to form a cylinder on the inner side of the middle foundation inner cavity mold. S2. First, design a positioning plate according to the shape and size of the anchor plate and the installation layout of two adjacent anchor plates. Make multiple positioning holes through the positioning plate for the anchor plates to be inserted. Then, place the positioning plate on the inner mold of the foundation cavity. Insert the first anchor plate into the positioning hole of the positioning plate and fix the anchor plate on the inner mold of the foundation cavity with bolts. Then, insert the second anchor plate into the other positioning hole of the positioning plate and fix it. Then, remove the positioning plate from the two fixed anchor plates, move the positioning plate, put one positioning hole on the positioning plate into the second fixed anchor plate, and then insert the third anchor plate into the other positioning hole of the positioning plate and fix it. In this way, complete the positioning and installation of multiple anchor plates one by one. S3, Tie the wind turbine foundation steel bars. During the tying process, pay attention to reserving the position of the support pipe. After the foundation steel bars are tied, install the lower part of the support pipe into the anchor plate and the upper part temporarily leans against the steel cage. S4. On the foundation steel cage, the grouting trench mold is assembled sequentially from the direction of the wind turbine tower gate. The connecting components are designed according to the shape and size of the support pipe. The support pipe and the grouting trench mold are fixed and locked together by the connecting components. S5. Assemble and install the outer cavity mold of the foundation on the foundation pad layer, and then pour concrete between the outer cavity mold and the inner cavity mold of the foundation until the concrete wets the grouting groove mold but does not exceed the groove opening of the grouting groove mold. After the concrete solidifies to form the mixed tower foundation, remove the outer cavity mold, the inner cavity mold, the connecting components and the grouting groove mold. At this time, the grouting groove mold forms an annular groove on the top of the mixed tower foundation for the snap-fit ​​installation of the upper structure of the mixed tower.

[0014] Furthermore, one side of the positioning plate is configured as an arc shape that fits and abuts against the upper mold of the base cavity.

[0015] Furthermore, the positioning plate has a through slot for easy removal.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. The positioning plate designed in this invention can quickly and accurately position and install the anchor plate, solving the problem that the anchor plate is prone to displacement during the reinforcement binding and concrete pouring process in the traditional method of installing anchor plates, and ensuring that the anchor plate position does not shift during the foundation reinforcement installation and concrete pouring process. 2. The connection components designed in this invention can accurately position and install the support pipe and the grouting trench mold, solving the problem of repeatedly setting up theodolites to position and adjust the position of the support pipe and the grouting trench mold in the traditional method, and greatly shortening the cycle of manual measurement, positioning and fixing of the support pipe and the grouting trench mold. 3. The grouting trench mold designed in this invention is equipped with a limiting embedded part. After the concrete tower foundation is poured, the limiting embedded part is pre-embedded in the annular groove at the top of the concrete tower foundation. This can quickly complete the installation and fixation of the upper structure of the concrete tower. It solves the problem of the traditional method of relying on setting up a theodolite to position the limiting embedded part and welding it to the foundation steel cage. During the concrete pouring process, the steel cage is easily displaced, which in turn causes the limiting embedded part to shift. This improves the efficiency of the later concrete tower installation. 4. The present invention features a modular design for the grouting trench mold, which allows for quick installation and dismantling through a simple modular connection structure, facilitating installation, dismantling, and transportation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a front view of the prestressed system of the mixed tower foundation in the embodiment of this application on the inner cavity mold of the foundation.

[0019] Figure 2 This is a schematic diagram of the overall structure of the prestressed system of the mixed tower foundation on the inner cavity mold of the foundation in the embodiment of this application.

[0020] Figure 3 This is a partial structural diagram of the prestressed system of the mixed tower foundation on the inner cavity mold of the foundation in the embodiment of this application.

[0021] Figure 4 This is a schematic diagram of the structure of the support pipe, grouting trench mold and connecting components in the embodiments of this application.

[0022] Figure 5 This is a schematic diagram of the structure of the L-shaped connecting plate in the embodiment of this application.

[0023] Figure 6 This is a schematic diagram of the positioning plate in an embodiment of this application.

[0024] Reference numerals: 1. Anchor plate; 2. Insertion hole; 3. Support pipe; 4. Grouting trench mold; 5. Connecting assembly; 51. L-shaped connecting plate; 52. Fixing bolt; 6. Fixing hole; 7. Waist hole; 8. Slot; 9. Side plate; 10. Baffle; 11. Limiting embedded part; 12. Fan foundation pad layer; 13. Foundation inner cavity mold; 131. Foundation inner cavity lower mold; 132. Foundation inner cavity middle mold; 133. Foundation inner cavity upper mold; 14. Positioning plate; 15. Positioning hole; 16. Annular groove; 17. Groove opening. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] This application discloses a prestressed system for a hybrid tower foundation and its construction method. (Refer to...) Figure 1 The prestressed system of the hybrid tower foundation is set on the inner cavity mold 13 of the wind turbine foundation. Before constructing the prestressed system of the hybrid tower foundation, the inner cavity mold 13 and the outer cavity mold need to be constructed. First, the lower inner cavity mold 131 is enclosed to form a cylinder and vertically installed on the wind turbine foundation pad 12. Then, the middle inner cavity mold 132 is installed on top of the lower inner cavity mold 131, so that the middle inner cavity mold 132 is perpendicular to the lower inner cavity mold 131, and a ring structure is formed on the inner side of the top of the lower inner cavity mold 131. Finally, the upper inner cavity mold 133 is vertically installed above the middle inner cavity mold 132, and the upper inner cavity mold 133 is enclosed to form a cylinder inside the middle inner cavity mold 132, thus completing the construction of the inner cavity mold 13. Subsequently, the outer cavity mold is constructed on the wind turbine foundation pad 12, so that the outer cavity mold covers the inner cavity mold 13.

[0027] Reference Figure 1 , Figure 2 and Figure 3The prestressed system of the mixed tower foundation includes multiple prestressed system units, which are evenly distributed along the circumference of the inner cavity mold 13 of the foundation. Each prestressed system unit includes an anchor plate 1 fixedly installed on the inner cavity mold 132 of the foundation, a support pipe 3 vertically installed on the anchor plate 1, a grouting groove mold 4 installed on the end of the support pipe 3 away from the anchor plate 1, and a connecting assembly 5 for adjustingly installing the grouting groove mold 4 on the support pipe 3. To improve the strength of the mixed-structure foundation, it is necessary to ensure the uniform distribution of multiple prestressed system units. Therefore, before installing the anchor plate 1, a positioning plate 14 is designed according to the shape and size of the anchor plate 1 and the installation layout of two adjacent anchor plates 1. Multiple positioning holes 15 for the anchor plates 1 to be inserted are opened through the positioning plate 14. In this embodiment, the positioning plate 14 has two positioning holes 15. Then, the positioning plate 14 is placed on the inner mold 132 of the foundation cavity, and the first anchor plate 1 is inserted into the positioning hole 15 of the positioning plate 14 and fixed to the inner mold 132 of the foundation cavity with bolts. Next, the second anchor plate 1 is inserted into the other positioning hole 15 of the positioning plate 14 and fixed. Then, the positioning plate 14 is removed from the two fixed anchor plates 1, and the positioning plate 14 is moved so that one positioning hole 15 on the positioning plate 14 is fitted onto the second fixed anchor plate 1. Then, the third anchor plate 1 is inserted into the other positioning hole 15 of the positioning plate 14 and fixed. In this manner, the positioning and installation of multiple anchor plates 1 are completed one by one. At this time, multiple anchor plates 1 are evenly fixed on the inner mold 132 of the foundation cavity along the circumference of the inner mold 13.

[0028] Considering that both the anchor plate 1 and the positioning holes 15 are circular, when placing the positioning plate 14 on the inner mold 132 of the foundation cavity, it is necessary to ensure that the distances from the multiple positioning holes 15 on the positioning plate 14 to the upper mold 133 of the foundation cavity are the same. Therefore, referring to... Figure 2 , Figure 3 and Figure 6 One side of the positioning plate 14 is designed to be arc-shaped to fit and abut against the upper mold 133 of the foundation cavity. Each time the positioning plate 14 is placed, with its arc-shaped sidewall abutting against the upper mold 133 of the foundation cavity and one positioning hole 15 of the positioning plate 14 fitted onto the anchor plate 1 already fixed in front, the position of the positioning plate 14 on the middle mold 132 of the foundation cavity is precisely defined, thus ensuring the accurate positioning and installation of the subsequent anchor plate 1. To facilitate quick removal and placement of the positioning plate 14 from the middle mold 132 of the foundation cavity, a slot 17 is provided through the positioning plate 14 for easy retrieval.

[0029] After the positioning and installation of multiple anchor plates 1 are completed, multiple support pipes 3 need to be installed, referring to... Figure 1 , Figure 2 , Figure 3 and Figure 6An anchor plate 1 has an insertion hole 2. One end of the support pipe 3 is inserted into the corresponding insertion hole 2 of the anchor plate 1. At this time, the support pipe 3 is stably erected on the outside of the upper mold 133 of the foundation cavity and set perpendicular to the middle mold 132 of the foundation cavity. Since concrete needs to be poured to the outside of the foundation cavity mold 13 later, in order to prevent concrete from seeping into the support pipe 3 from the insertion hole 2, a sealing element is provided at the insertion hole 2 to seal the connection between the support pipe 3 and the anchor plate 1. The sealing element can be raw rubber tape or a sealing ring that is sleeved on the support pipe 3 and used to fill and seal the space between the support pipe 3 and the inner wall of the insertion hole 2.

[0030] After the positioning and installation of multiple support pipes 3 are completed, multiple grouting trench molds 4 need to be installed, referring to... Figure 2 , Figure 3 , Figure 4 and Figure 5 The grouting groove mold 4 has a U-shaped cross-section and is located on the side of the support pipe 3 away from the upper mold 133 of the foundation cavity. One side wall of the grouting groove mold 4 is detachably connected to the end of the support pipe 3 away from the anchor plate 1 via a connecting component 5. At this time, the groove opening 17 of the grouting groove mold 4 faces upwards. Multiple grouting groove molds 4 are set at the same height and spliced ​​together to form a ring structure. To ensure the stability of this ring structure, baffles 10 are fixed at both ends of the grouting groove mold 4, and connecting bolts are provided between adjacent grouting groove molds 4 to connect the two adjacent baffles 10 together. During the process of pouring concrete to the outside of the foundation cavity mold 13, the concrete needs to wet the grouting groove mold 4 but not exceed the groove opening 17 of the grouting groove mold 4. After the concrete has solidified to form the concrete tower foundation, the grouting groove mold 4 is removed. At this time, the grouting groove mold 4 forms an annular groove 16 on the top of the concrete tower foundation for the snap-fit ​​installation of the upper structure of the concrete tower. To further improve the efficiency of the snap-fit ​​installation of the superstructure of the mixed tower, a through hole is provided on the bottom wall of the grouting mold 4. A limiting embedded part 11 is installed in the through hole of the grouting mold 4. The limiting embedded part 11 is made of iron sheet. The grouting mold 4 is also made of iron. The limiting embedded part 11 is temporarily fixed in the through hole of the grouting mold 4 by spot welding. When pouring concrete, the limiting embedded part 11 is partially immersed in the concrete. When removing the grouting mold 4, the spot weld can be cut with a tool so that the limiting embedded part 11 is always pre-embedded in the annular groove 16 at the top of the mixed tower foundation for subsequent alignment and snap-fit ​​installation of the superstructure of the mixed tower.

[0031] To achieve rapid assembly and disassembly between the grouting trench formwork 4 and the support pipe 3, refer to Figure 2 , Figure 3 , Figure 4 and Figure 5The connecting component 5 includes an L-shaped connecting plate 51, multiple fixing bolts 52, and wire. The L-shaped connecting plate 51 is inverted and positioned above the grouting trench mold 4. Multiple slotted holes 7 are formed through the panel of the L-shaped connecting plate 51 near the grouting trench mold 4. In this embodiment, two slotted holes 7 are provided, spaced apart along the width of the L-shaped connecting plate 51. Two fixing bolts 52 are also provided, corresponding one-to-one with the two slotted holes 7. Two threaded holes are formed on the side wall of the grouting trench mold 4 near the support pipe 3. The panel of one end of the L-shaped connecting plate 51 is pressed tightly against the inner side wall of the grouting trench mold 4. Then, the fixing bolts 52 are passed through the slotted holes 7 and threaded into the threaded holes. By tightening the fixing bolts 52, the grouting trench mold 4 can be quickly connected to the panel of one end of the L-shaped connecting plate 51. The other end of the L-shaped connecting plate 51 has a slot 8 on its side wall that is adapted to engage with the support pipe 3. Multiple fixing holes 6 are provided through the panel of the L-shaped connecting plate 51 with the slot 8. In this embodiment, two fixing holes 6 are provided, located on either side of the slot 8. A wire passing through the two fixing holes 6 can stably bind one end of the L-shaped connecting plate 51 to the support pipe 3. The slot 8 also limits the swaying of the L-shaped connecting plate 51 relative to the support pipe 3, ensuring that the grouting trench mold 4 is always perpendicular to the support pipe 3.

[0032] To enhance the stability of the L-shaped connecting plate 51 structure, therefore, refer to Figure 5 Both sides of the L-shaped connecting plate 51 are provided with side plates 9. The side plates 9 are fixedly connected between the two panels of the L-shaped connecting plate 51. Under the connection of the side plates 9, the panels at both ends of the L-shaped connecting plate 51 are always in a vertical state, which also ensures the stability of the relative position between the grouting groove mold 4 and the support pipe 3.

[0033] This application provides a construction method for a prestressed system for mixed tower foundations, which adopts the following technical solution: S1, the foundation inner cavity mold 13 is assembled and installed on the wind turbine foundation pad 12. First, the foundation inner cavity lower mold 131 is enclosed to form a cylindrical shape and vertically installed on the wind turbine foundation pad 12. Then, the foundation inner cavity middle mold 132 is installed on the top of the foundation inner cavity lower mold 131, so that the foundation inner cavity middle mold 132 is perpendicular to the foundation inner cavity lower mold 131, and a ring structure is formed on the inner side of the top of the foundation inner cavity lower mold 131. Finally, the foundation inner cavity upper mold 133 is vertically installed above the foundation inner cavity middle mold 132, and the foundation inner cavity upper mold 133 is enclosed to form a cylindrical shape on the inner side of the foundation inner cavity middle mold 132. S2. First, design a positioning plate 14 according to the shape and size of the anchor plate 1 and the installation layout of two adjacent anchor plates 1. Make multiple positioning holes 15 through the positioning plate 14 for the anchor plates 1 to be inserted. Then, place the positioning plate 14 on the inner mold 132 of the foundation cavity. Insert the first anchor plate 1 into the positioning hole 15 of the positioning plate 14 and fix the anchor plate 1 on the inner mold 132 of the foundation cavity with bolts. Then, insert the second anchor plate 1 into another positioning hole 15 of the positioning plate 14 and fix it. Then, remove the positioning plate 14 from the two fixed anchor plates 1. Move the positioning plate 14 and fit one positioning hole 15 on the positioning plate 14 onto the second fixed anchor plate 1. Then, insert the third anchor plate 1 into another positioning hole 15 of the positioning plate 14 and fix it. In this way, complete the positioning and installation of multiple anchor plates 1 one by one. S3, tie the wind turbine foundation steel bars. During the tying process, pay attention to leaving the position of the support pipe 3. After the foundation steel bars are tied, install the lower part of the support pipe 3 into the anchor plate 1, and temporarily lean the upper part against the steel cage. Use a sealing device to seal the connection between the support pipe 3 and the anchor plate 1. S4, assemble the grouting trench mold 4 sequentially from the wind turbine tower gate direction on the foundation steel cage, design the connecting component 5 according to the shape and size of the support pipe 3, and fix and lock the support pipe 3 and the grouting trench mold 4 through the connecting component 5. S5, the foundation outer cavity mold is assembled and installed on the wind turbine foundation pad layer 12, and then grout is injected between the foundation outer cavity mold and the foundation inner cavity mold 13 until the concrete saturates the grouting groove mold 4 but does not exceed the groove opening 17 of the grouting groove mold 4. After the concrete solidifies to form the mixed tower foundation, the foundation outer cavity mold, foundation inner cavity mold 13, connecting component 5 and grouting groove mold 4 are removed. At this time, the grouting groove mold 4 forms an annular groove 16 on the top of the mixed tower foundation for the snap-fit ​​installation of the upper structure of the mixed tower.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A prestressed system for a mixed-structure tower foundation, installed on the inner cavity mold of the wind turbine foundation, characterized in that, include Anchor plates are provided in multiple ways. The multiple anchor plates are evenly distributed along the circumference of the inner cavity mold of the foundation. The anchor plates are fixedly installed on the inner cavity mold of the foundation. Insertion holes are provided on the anchor plates. Multiple support tubes are provided, each corresponding to a different anchor plate. The support tubes are located outside the upper mold of the foundation cavity and perpendicular to the middle mold of the foundation cavity. One end of the support tube is inserted into the corresponding hole of the anchor plate. Multiple grouting trench molds are provided, each corresponding to a different support pipe. The grouting trench mold is installed on the end of the support pipe away from the anchor plate. Multiple grouting trench molds are spliced ​​together to form a ring structure, and the support pipe is located inside the ring structure. as well as A connecting assembly is disposed between the support pipe and the grouting trench mold, and is used to adjustably install the grouting trench mold onto the support pipe.

2. The prestressed system for hybrid tower foundations according to claim 1, characterized in that, The connecting assembly includes an L-shaped connecting plate, multiple fixing bolts, and iron wire. The L-shaped connecting plate is inverted and positioned above the grouting trench mold. One end of the L-shaped connecting plate is detachably connected to the side wall of the grouting trench mold via multiple fixing bolts, and the other end is bound to the support pipe via iron wire. One end of the L-shaped connecting plate has multiple fixing holes for iron wire to pass through, and the other end has a waist hole for fixing bolts to pass through. The side wall of the grouting trench mold has threaded holes for the fixing bolts to be threaded.

3. The prestressed system for hybrid tower foundations according to claim 2, characterized in that, The L-shaped connecting plate has a slot on its side wall near the support tube that is compatible with the support tube.

4. The prestressed system for hybrid tower foundations according to claim 2, characterized in that, The L-shaped connecting plate has side plates on both sides, and the side plates are fixedly connected between the two panels of the L-shaped connecting plate.

5. The prestressed system for hybrid tower foundations according to claim 1, characterized in that, Both ends of the grouting trench mold are fixed with baffles, and connecting bolts are provided between two adjacent grouting trench molds to connect the two close-to-each baffles together.

6. The prestressed system for hybrid tower foundations according to claim 1, characterized in that, A through hole is provided on the bottom wall of the grouting trench mold, and a limit anchor is installed in the through hole of the grouting trench mold.

7. The prestressed system for hybrid tower foundations according to claim 1, characterized in that, The insertion hole is equipped with a sealing element for sealing the connection between the support tube and the anchor plate.

8. A construction method for a prestressed composite tower foundation system, based on a prestressed composite tower foundation system as described in any one of claims 1-7, characterized in that, Includes the following steps, S1. The foundation inner cavity mold is assembled and installed on the wind turbine foundation pad layer. First, the lower foundation inner cavity mold is enclosed to form a cylinder and vertically installed on the wind turbine foundation pad layer. Then, the middle foundation inner cavity mold is installed on the top of the lower foundation inner cavity mold, so that the middle foundation inner cavity mold is perpendicular to the lower foundation inner cavity mold and forms a ring structure on the inner side of the top of the lower foundation inner cavity mold. Finally, the upper foundation inner cavity mold is vertically installed above the middle foundation inner cavity mold, and the upper foundation inner cavity mold is enclosed to form a cylinder on the inner side of the middle foundation inner cavity mold. S2. First, design a positioning plate according to the shape and size of the anchor plate and the installation layout of two adjacent anchor plates. Make multiple positioning holes through the positioning plate for the anchor plates to be inserted. Then, place the positioning plate on the inner mold of the foundation cavity. Insert the first anchor plate into the positioning hole of the positioning plate and fix the anchor plate on the inner mold of the foundation cavity with bolts. Then, insert the second anchor plate into the other positioning hole of the positioning plate and fix it. Then, remove the positioning plate from the two fixed anchor plates, move the positioning plate, put one positioning hole on the positioning plate into the second fixed anchor plate, and then insert the third anchor plate into the other positioning hole of the positioning plate and fix it. In this way, complete the positioning and installation of multiple anchor plates one by one. S3, Tie the wind turbine foundation steel bars. During the tying process, pay attention to reserving the position of the support pipe. After the foundation steel bars are tied, install the lower part of the support pipe into the anchor plate and the upper part temporarily leans against the steel cage. S4. On the foundation steel cage, the grouting trench mold is assembled sequentially from the direction of the wind turbine tower gate. The connecting components are designed according to the shape and size of the support pipe. The support pipe and the grouting trench mold are fixed and locked together by the connecting components. S5. Assemble and install the outer cavity mold of the foundation on the foundation pad layer, and then pour concrete between the outer cavity mold and the inner cavity mold of the foundation until the concrete wets the grouting groove mold but does not exceed the groove opening of the grouting groove mold. After the concrete solidifies to form the mixed tower foundation, remove the outer cavity mold, the inner cavity mold, the connecting components and the grouting groove mold. At this time, the grouting groove mold forms an annular groove on the top of the mixed tower foundation for the snap-fit ​​installation of the upper structure of the mixed tower.

9. The construction method of the prestressed system for hybrid tower foundations according to claim 8, characterized in that, One side of the positioning plate is designed to be arc-shaped to fit and abut against the upper mold of the base cavity.

10. The construction method of the prestressed system for hybrid tower foundations according to claim 8, characterized in that, The positioning plate has a through slot for easy removal.

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