Method for manufacturing a hybrid tower foundation with a flexible connection and a hybrid tower foundation

Abstract

This invention belongs to the field of hybrid tower foundations, and provides a method for preparing a hybrid tower foundation with a flexible connection structure, as well as the hybrid tower foundation itself. The method for preparing the hybrid tower foundation with a flexible connection structure includes: pouring a concrete foundation pad; constructing a hollow base slab reinforcement on the concrete foundation pad; placing a waterstop at the pre-embedded location in the structural concrete, with additional stirrups and reinforcing bars at the pre-embedded location; leveling the waterstop and then clamping it with formwork support; pouring reinforced concrete hollow base slab concrete in stages; filling the upper and lower sides of the waterstop with wood-plastic composite boards; constructing the foundation base slab reinforcement; pouring the foundation base slab concrete; after the foundation base slab concrete has cured, chiseling out pre-set length gaps on both sides of the wood-plastic composite boards, filling the gaps with sealant and placing rubber rings; applying a first waterproof layer to the reinforced concrete hollow base slab, placing a foam board on the first waterproof layer; and applying a waterproof cement mortar layer and a second waterproof layer to the surfaces of the foam board and rubber rings.

Description

Technical Field

[0001] This invention belongs to the field of mixed tower foundations, and particularly relates to a method for preparing a mixed tower foundation with a flexible connection structure and the mixed tower foundation itself. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Wind turbines are mainly divided into steel-flexible towers and steel-concrete towers. Steel-concrete towers generally refer to towers constructed from both steel and concrete, with a concrete lower section and a steel upper section, including fully concrete and semi-concrete types. They offer high overall structural rigidity and reliability. As the load-bearing component of the wind turbine, the foundation of conventional concrete tower foundations currently uses a hollow base slab and abutment foundation as a single pour. Under external loads, cracks easily form at the interface between the hollow base slab and the abutment foundation, leading to groundwater intrusion. Existing waterproofing methods generally include structural self-waterproofing (utilizing the impermeability of waterproof concrete), adding a waterproof layer, or drainage waterproofing (using blind drains, drainage layers, etc., to drain water from nearby sources). However, the risk of leakage still exists due to problems with the waterproof layer, defects in the foundation treatment, water seepage in the internal walls, and failure of the waterproofing material.

[0004] In summary, the existing concrete tower foundation is cast in one piece, and under load, there is a sudden change in stiffness at the cross section. Stress concentration will cause cracks, which will lead to water ingress into the foundation cavity. Summary of the Invention

[0005] To address the technical problems mentioned above, this invention provides a method for preparing a hybrid tower foundation with a flexible connection structure and the hybrid tower foundation itself. The foundation is structurally separated from the ring-shaped foundation platform and the circular base plate, and then a flexible connection is used in the annular vertical gap to achieve waterproofing. This solves the problem that the original integrally cast foundation has abrupt changes in stiffness under load, and stress concentration can cause cracks, leading to water ingress into the foundation cavity.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a method for preparing a hybrid tower foundation with a flexible connection structure.

[0008] The flexible connection structure includes a waterstop, a wood-plastic composite board, and a rubber ring; the preparation method of the mixed tower foundation with the flexible connection structure includes:

[0009] Pour the concrete foundation layer and then construct the hollow bottom slab reinforcement on the concrete foundation layer;

[0010] Place the waterstop at the pre-embedded location in the structural concrete, and add stirrups and reinforcing bars at the pre-embedded location;

[0011] After leveling the waterstop, formwork support is installed, and two formwork panels are used to clamp the waterstop.

[0012] The reinforced concrete cavity bottom slab is poured in stages; the first layer of concrete is poured down to below the waterstop. After the concrete is vibrated and compacted, the rubber waterstop is placed flat before the second layer of concrete can be poured.

[0013] Wood-plastic composite boards are filled on both the upper and lower sides of the waterstop.

[0014] Reinforcing steel bars for the foundation slab and pouring concrete for the foundation slab.

[0015] After the foundation slab concrete has been cured, cut out gaps of a predetermined length on both sides of the wood-plastic composite board, fill the gaps with sealant and place rubber rings.

[0016] Apply the first waterproof layer to the reinforced concrete cavity bottom slab, and place a foam board on the first waterproof layer. The edge of the foam board coincides with the outline of the reinforced concrete cavity bottom slab, and the foam board fits tightly with the rubber ring.

[0017] Apply a layer of waterproof cement mortar and a second waterproof layer to the surface of the foam board and rubber ring.

[0018] As one implementation method, the concrete foundation layer is constructed in two stages.

[0019] As one implementation method, during the construction of the cavity bottom slab reinforcement on the concrete cushion layer, the reinforcement is installed in an orderly manner from bottom to top and from inside to outside.

[0020] As one implementation method, the waterstop is connected using a thermal bonding method.

[0021] In one embodiment, the waterstop is a polyethylene waterstop.

[0022] As one implementation method, cement mortar is applied to the joint of the two templates that clamp the waterstop beforehand, and the contact surface between the template and the concrete is cleaned and coated with a release agent.

[0023] As one implementation method, after the reinforced concrete cavity base slab is poured, the concrete is covered and kept moist for a set period of time.

[0024] As one implementation method, the formwork can only be removed after the reinforced concrete cavity bottom slab has been cured.

[0025] In one embodiment, the rubber ring is a polyurethane thermoplastic rubber ring that expands when exposed to water;

[0026] In one embodiment, the foam board is a closed-cell polystyrene foam board.

[0027] In one embodiment, the wood-plastic composite board is a PVC wood-plastic composite board.

[0028] A second aspect of the invention provides a mixed tower foundation.

[0029] A hybrid tower foundation is prepared using the steps described above in the preparation method of a hybrid tower foundation with a flexible connection structure; the flexible connection structure is disposed between the foundation base plate and the reinforced concrete cavity base plate.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] (1) This invention sets up a flexible connection structure between the foundation slab and the reinforced concrete cavity slab, so that the foundation platform and the slab are structurally separated. The flexible connection structure achieves the goal of waterproofing the gaps, which solves the problem that the original integral casting has a sudden change in stiffness section under load, and stress concentration will cause cracks, resulting in water entering the foundation cavity. This optimizes the amount of foundation and pile foundation engineering.

[0032] (2) The present invention uses wood-plastic board, waterstop and rubber ring to form a flexible structure at the expansion joint. The rubber ring has good load-bearing capacity and energy absorption and shock absorption effect. Moreover, the materials of wood-plastic board and waterstop at the expansion joint are easy to repair and replace in the future.

[0033] (3) In order to ensure the waterproof performance of the bottom of the cavity, the present invention further installs a foam board on the bottom surface of the cavity and applies two layers of waterproof layer, taking advantage of its low surface water absorption rate and good anti-permeability performance to enhance the waterproof performance and durability of the structure.

[0034] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0035] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0036] Figure 1 This is a cross-sectional view of a traditional mixed-structure foundation;

[0037] Figure 2 A cross-sectional view of the cavity bottom of a hybrid tower foundation with a flexible connection structure provided in an embodiment of the present invention.

[0038] Figure 3 for Figure 2 A magnified view of the flexible connection at point A in the middle.

[0039] Figure 4A detailed cross-sectional view of the flexible connection in a hybrid tower foundation with a flexible connection structure provided for an embodiment of the present invention.

[0040] Figure 5 A top view of the flexible connection in a hybrid tower foundation with a flexible connection structure provided in an embodiment of the present invention.

[0041] In the diagram: 1. PHC pipe long pile, 2. Foundation slab, 3. Concrete cushion layer, 4. Prestressed cable duct, 5. Grouting groove, 6. Embedded steel pipe, 7. Flexible connection, 8. Cavity, 9. Sump, 10. Reinforced concrete cavity slab, 11. PHC pipe short pile, 12. Rubber ring, 13. Waterstop, 14. Wood-plastic composite board, 15. Second waterproof layer, 16. Foam board, 17. First waterproof layer. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] Figure 1 A cross-sectional view of a traditional hybrid tower foundation is given; the hybrid tower foundation includes PHC pipe long pile 1, foundation base slab 2, concrete cushion layer 3, prestressed cable duct 4, grouting groove 5, pre-embedded steel pipe 6, cavity 8, sump 9, reinforced concrete cavity base slab 10, and PHC pipe short pile 11.

[0046] Figure 1 The hollow base plate of the mixed tower foundation and the foundation cap are cast as one piece. This results in a sudden change in stiffness of the cross section under load, and stress concentration will cause cracks, which will lead to water ingress into the foundation cavity.

[0047] In order to solve Figure 1 The present invention addresses the technical problems existing in traditional hybrid tower foundations and provides a method for preparing a hybrid tower foundation with a flexible connection structure.

[0048] The following example illustrates the specific implementation process of this embodiment, using polyethylene waterstop, polystyrene closed-cell foam board, PVC wood-plastic composite board, and polyurethane water-swellable thermoplastic rubber ring as examples.

[0049] Among them, such as Figure 2 As shown, the flexible connection structure includes a waterstop 13, a wood-plastic composite board 14, and a rubber ring 12. The flexible connection structure is located at the flexible connection point 7 between the foundation slab 2 and the reinforced concrete cavity slab 10. The deformation joint at the flexible connection point 7 is marked out. The specific structure of the flexible connection point 7 is as follows... Figure 3 , Figure 4 and Figure 5 As shown.

[0050] The method for preparing a hybrid tower foundation with a flexible connection structure in this embodiment includes:

[0051] Step 1: Pour the concrete foundation 3 and then construct the hollow bottom slab reinforcement on the concrete foundation 3.

[0052] Specifically, the concrete foundation layer 3 is constructed in two stages.

[0053] For example: C15 concrete is used for the subbase. The concrete is transported by mixer truck, pumped into the silo by truck, and assisted by chute. The concrete is leveled manually. After the concrete is poured, the surface is finished. When finishing the surface, care should be taken not to smooth it. The flatness should not be greater than 2mm. After the concrete is poured, water should be sprinkled in time and the surface should be kept warm and cured with plastic film.

[0054] Step 2: Place the waterstop at the pre-embedded location in the structural concrete, and add stirrups and reinforcing bars at the pre-embedded location, such as... Figure 3 As shown, the additional stirrups and reinforcing bars are securely tied to the original foundation reinforcing bars. At the same time, care must be taken to ensure that the polyethylene (PE) waterstop stirrups are upright to prevent the waterstop from becoming misaligned due to the stirrups tilting.

[0055] During the construction of the cavity bottom slab 10 reinforcement on the concrete cushion layer, the reinforcement is installed in an orderly manner from bottom to top and from inside to outside.

[0056] The surface of the reinforcing bars should be clean and undamaged. Paint contamination and rust should be removed before use. Reinforcing bars with granular or flaky old rust should not be used. The subgrade should be cleaned before installation to ensure its surface is clean. Mechanical connections of the reinforcing bars should use rolled ribbed straight thread connections.

[0057] The polyethylene (PE) waterstop is placed manually into the pre-embedded location, taking care to prevent the polyethylene (PE) waterstop from being torn by steel bars or nails.

[0058] Due to the large expansion joint, the waterstop 13 was connected using a hot-melt welding method. First, the waterstop joint was neatly cut, and the ends were ground using a grinder. Rubber backing strips and raw rubber connecting strips were cut separately. The hot-melt welding machine was turned off, and the waterstop joint was laid flat on the welding machine base plate. The hot-melt welding machine was then turned on, and the bolts were tightened. After 5 minutes of power-on, the bolts were tightened again to apply pressure (until they could not be tightened further). Heating continued for 5 minutes, and then the welding was completed. After the hot-melt welding machine cooled for 20 minutes, the waterstop was removed, and a visual inspection of the weld was performed. Installation could only proceed after the weld passed inspection.

[0059] Step 3: After leveling the waterstop, install formwork support and use two formwork panels to clamp the waterstop.

[0060] Specifically, check whether the polyethylene (PE) waterstop is straight. After leveling, install formwork support. The formwork at the expansion joint is divided into upper and lower parts. The upper and lower formwork should clamp the polyethylene (PE) waterstop to prevent slippage and ensure that the two parts of the formwork are on the same vertical plane.

[0061] Among them, the joints of the formwork should not leak grout. The gaps can be pre-treated with cement mortar. The contact surface between the formwork and the concrete should be cleaned and coated with a release agent, but release agents that affect the structural performance should not be used.

[0062] Step 4: Pour the reinforced concrete cavity bottom slab concrete in stages; the first layer of concrete is poured down to below the waterstop. After the concrete is vibrated and compacted, the rubber waterstop is placed flat before the second layer of concrete can be poured.

[0063] Specifically, the concrete pouring is done in two steps. The first layer of concrete is poured up to below the polyethylene (PE) waterstop. During vibration, the PE waterstop poured into the concrete structure on one side can be hooked up with an iron hook to allow air bubbles to escape. Once the concrete is compacted and no more air bubbles are released, the rubber waterstop is laid flat before pouring the second layer of concrete. During vibration, the rubber waterstop should be checked to prevent horizontal slippage. It is crucial to ensure continuous pouring without construction joints, ensuring the entire layer is poured in one go.

[0064] After the concrete is poured, it should be covered and kept moist within 12 hours, and the curing time should not be less than 14 days. During the moist curing process, the integrity of the plastic film or curing agent should be checked frequently, and the concrete surface should be kept moist.

[0065] The formwork can only be removed after curing is complete. Before removing the formwork, the formwork must not be loosened or the polyethylene (PE) waterstop must not be disturbed, and the polyethylene (PE) waterstop that has not yet been poured with concrete should be protected from damage at all times.

[0066] Step 5: Fill the upper and lower sides of the waterstop with wood-plastic composite boards.

[0067] Specifically, a primer compatible with wood-plastic composite board 14 (such as PVC wood-plastic composite board) is applied to the bottom of the expansion joint and the outside of the cavity base plate. The debris and concrete slurry in the expansion joint are then cleaned, and PVC wood-plastic composite boards are filled on the upper and lower sides of the waterstop embedment area, with the lower PVC wood-plastic composite board serving as the template for the lower side of the waterstop of the foundation base plate 2.

[0068] Step 6: Construct the foundation slab reinforcement and pour the foundation slab concrete.

[0069] The construction process of reinforcing bar binding is the same as that of the cavity bottom plate 10.

[0070] Formwork is installed on the outside of the foundation slab 2 and the outside of the expansion joint. Formwork is installed around the foundation. Sponge strips are applied to the formwork joints to prevent grout leakage. The formwork is reinforced with chain hoists.

[0071] The foundation slab concrete was poured continuously as a whole.

[0072] Specifically, when pouring concrete on the other side, the polyethylene (PE) waterstop should be checked for integrity first, and any debris and concrete slurry from the PE waterstop should be cleaned up.

[0073] The construction process for pouring concrete for the foundation slab 2 is the same as that for pouring concrete for the cavity slab 10.

[0074] After the concrete is poured, cover it and keep it moist within 12 hours. The curing time should not be less than 14 days. During the moist curing process, the integrity of the plastic film or curing agent should be checked frequently, and the concrete surface should be kept moist. The formwork can only be removed after curing is complete.

[0075] Step 7: After the foundation slab concrete has been cured, cut out gaps of a predetermined length on both sides of the wood-plastic composite board 14, fill the gaps with sealant and place rubber rings 12.

[0076] For example, after the foundation concrete has been cured, chisel out 2-3cm gaps on both sides of the PVC wood-plastic board, clean out the debris and let it dry, then put in the prepared polysulfide sealant to ensure full filling. The polysulfide sealant should be prepared as needed to prevent it from hardening on the surface due to excessive time.

[0077] Clean the gaps thoroughly to ensure they are clean before installing the water-swellable thermoplastic rubber ring. The water-swellable thermoplastic rubber ring 2 must fit tightly into the cavity base plate 10 and the foundation base plate 2. Apply the prepared polysulfide sealant to the water-swellable thermoplastic rubber ring and its surrounding area, ensuring complete filling.

[0078] Step 8: Apply the first waterproof layer to the reinforced concrete cavity bottom slab, place a foam board on the first waterproof layer, with the edge of the foam board coinciding with the outline of the reinforced concrete cavity bottom slab, and the foam board and rubber ring fitting tightly together.

[0079] Specifically, the reinforced concrete cavity slab 10 uses C15 concrete, and the first waterproof layer 17 uses polymer cement-based waterproofing, which is corrosion-resistant and not prone to cracking, and the waterproofing design is Class I. The waterproofing layer should be applied in layers, possibly two or more coats depending on the designed thickness. Each coat should be 0.5–0.6 mm thick (0.6 mm for the first coat, and 0.5 mm for each subsequent coat). Each coat should be applied evenly and consistently. The next coat should only be applied when the previous coat is dry to the touch. The application directions should be perpendicular to each other, starting with the walls and then the floor, proceeding from the inside out. Failure to apply the waterproofing layer in stages will result in cracking after the waterproofing film has formed.

[0080] The waterproof layer must undergo a water tightness test, which shall last for no less than 24 hours.

[0081] Specifically, before installation, the foam board 16 (e.g., polystyrene closed-cell foam board) should be stored in a dry and ventilated place. The surface of the first waterproof layer 17 must be cleaned and free of debris before installation.

[0082] For example, a 100mm thick polystyrene closed-cell foam board is fixed to a reinforced concrete cavity base slab 10 that has already been coated with the first layer of waterproofing 17 using cement nails. The edge of the polystyrene closed-cell foam board 16 should coincide with the outline of the reinforced concrete cavity base slab 10. If the foam board 16 needs to be installed in sections, the joints must be tight and flat. A circle with a diameter of 300mm needs to be cut from the center of the foam board for placing the sump.

[0083] Ensure that the rubber ring 12 and the foam board 16 fit together perfectly.

[0084] Step 9: Apply a layer of waterproof cement mortar and a second waterproof layer to the surface of the foam board and rubber ring.

[0085] Specifically, first clean the surface of the foam board 16 and the water-swellable thermoplastic rubber ring, then apply waterproof cement mortar using a two-coat base and two-coat top application method. The base coat should be 1.0-1.2 cm thick, and the top coat should be 1.0-1.3 cm thick. Do not apply too tightly to avoid cracking.

[0086] The second waterproof layer (15) uses polymer cement-based waterproofing. The waterproofing layer should be applied in layers, possibly two or more coats depending on the designed thickness. Each coat should be 0.5–0.6 mm thick (0.6 mm for the first coat, and 0.5 mm for each subsequent coat). Each coat should be applied evenly and consistently. The next coat should only be applied when the previous coat is dry to the touch. The application directions should be perpendicular to each other, starting with the walls and working outwards from the inside. Failure to apply the waterproofing layer in stages will result in cracking after the waterproofing film has formed.

[0087] The waterproof layer must undergo a water tightness test, which shall last for no less than 24 hours.

[0088] The reinforced concrete cavity base plate 10 is cured.

[0089] In this embodiment, the PVC wood-plastic composite board used at the expansion joint is made of PVC resin, wood powder, and other additives, and features corrosion resistance, weather resistance, and waterproofing. The polyethylene (PE) waterstop has high strength and toughness, can withstand significant external forces, and possesses excellent aging resistance, weather resistance, and corrosion resistance. The water-swellable thermoplastic rubber ring of polyurethane (PU) has good load-bearing capacity and energy absorption and shock absorption properties. All materials used at the expansion joint are easy to maintain and replace in the future. Furthermore, to ensure the waterproof performance of the cavity bottom, a polystyrene closed-cell foam board is installed on the bottom surface of the cavity and coated with two layers of waterproofing. Utilizing its low surface water absorption and good impermeability, the polystyrene closed-cell foam board enhances the structure's waterproofness and durability. Moreover, polystyrene closed-cell foam board is affordable, has a long service life, and is easy to process.

[0090] It should be noted that those skilled in the art can also specify the waterstop, foam board, wood-plastic composite board, and rubber ring according to the actual situation, which will not be elaborated here.

[0091] In one or more embodiments, a hybrid tower foundation is also provided, which is prepared by the steps in the preparation method of the hybrid tower foundation with flexible connection structure as described above; the flexible connection structure is disposed between the foundation base plate and the reinforced concrete cavity base plate.

[0092] This embodiment solves the problem of water ingress into the foundation cavity by setting a flexible connection structure between the foundation slab and the reinforced concrete cavity slab, thereby separating the foundation cap and the slab as a whole. The flexible connection structure also achieves waterproofing at the gaps, thus solving the problem of abrupt stiffness changes and stress concentration that can cause cracks in the original integral casting under load, which leads to stress concentration and water ingress into the foundation cavity. This optimizes the amount of foundation and pile foundation work.

[0093] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a hybrid tower foundation with a flexible connection structure, characterized in that, The flexible connection structure includes a waterstop, a wood-plastic composite board, and a rubber ring; The method for preparing the hybrid tower foundation with a flexible connection structure includes: The flexible connection structure is located at the flexible connection between the foundation slab and the reinforced concrete cavity slab, and the positioning line is laid out at the deformation joint of the flexible connection. Pour the concrete foundation layer and then construct the hollow bottom slab reinforcement on the concrete foundation layer; Place the waterstop at the pre-embedded location in the structural concrete, and add stirrups and reinforcing bars at the pre-embedded location; After leveling the waterstop, formwork support is installed, and two formwork panels are used to clamp the waterstop. The reinforced concrete cavity bottom slab is poured in stages; the first layer of concrete is poured down to below the waterstop. After the concrete is vibrated and compacted, the rubber waterstop is placed flat before the second layer of concrete can be poured. Wood-plastic composite boards are filled on both the upper and lower sides of the waterstop. Reinforcing steel bars for the foundation slab and pouring concrete for the foundation slab. After the foundation slab concrete has been cured, cut out gaps of a predetermined length on both sides of the wood-plastic composite board, fill the gaps with sealant and place rubber rings. Apply the first waterproof layer to the reinforced concrete cavity bottom slab, and place a foam board on the first waterproof layer. The edge of the foam board coincides with the outline of the reinforced concrete cavity bottom slab, and the foam board fits tightly with the rubber ring. Apply a layer of waterproof cement mortar and a second waterproof layer to the surface of the foam board and rubber ring; The waterproof layer must undergo a water tightness test, which shall last for no less than 24 hours.

2. The method for preparing a hybrid tower foundation with a flexible connection structure as described in claim 1, characterized in that, The concrete foundation layer was constructed in two stages.

3. The method for preparing a hybrid tower foundation with a flexible connection structure as described in claim 1, characterized in that, During the construction of the hollow bottom slab reinforcement on the concrete cushion layer, the reinforcement is installed in an orderly manner from bottom to top and from inside to outside.

4. The method for preparing a hybrid tower foundation with a flexible connection structure as described in claim 1, characterized in that, The waterstop strip is connected using a heat-sealing method.

5. The method for preparing a hybrid tower foundation with a flexible connection structure as described in claim 1, characterized in that, The waterstop is a polyethylene waterstop.

6. The method for preparing a hybrid tower foundation with a flexible connection structure as described in claim 1, characterized in that, Beforehand, apply cement mortar to the joint of the two formworks that clamp the waterstop, and clean the contact surface between the formwork and the concrete and apply a release agent.

7. The method for preparing a hybrid tower foundation with a flexible connection structure as described in claim 1, characterized in that, After the reinforced concrete cavity base slab is poured, the concrete is covered and kept moist for a set period of time.

8. The method for preparing a hybrid tower foundation with a flexible connection structure as described in claim 7, characterized in that, The formwork can only be removed after the reinforced concrete cavity base slab has been cured.

9. The method for preparing a hybrid tower foundation with a flexible connection structure as described in claim 1, characterized in that, The rubber ring is a polyurethane thermoplastic rubber ring that expands when exposed to water; or The foam board is a closed-cell polystyrene foam board. or The wood-plastic composite board is a PVC wood-plastic composite board.

10. A mixed tower foundation, characterized in that, The foundation is prepared using the steps in the preparation method of the hybrid tower foundation with flexible connection structure as described in any one of claims 1-9; the flexible connection structure is disposed between the foundation base plate and the reinforced concrete cavity base plate.

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