A solid base prestressed segmented concrete tower structure

Abstract

This utility model discloses a solid foundation prestressed segmented concrete tower structure, belonging to the field of concrete tower technology, and solves the problem of limited construction space in the cavity of existing concrete tower foundations. It includes a foundation base plate, lower pipe sections, upper pipe sections, and a top pipe section installed from bottom to top. The foundation base plate is a solid structure. There are multiple upper pipe sections. The foundation base plate and lower pipe sections are connected and reinforced by a lower prestressed system. The lower, upper, and top pipe sections are connected and reinforced by an upper prestressed system. The lower and upper prestressed systems are radially staggered along the concrete tower, and the lower prestressed system is embedded within the foundation base plate and lower pipe sections. This concrete tower structure effectively reduces the thickness of the foundation base plate and the area of ​​the foundation, and significantly reduces the amount of concrete and steel reinforcement used.

Description

Technical Field

[0001] This utility model relates to the field of concrete tower technology, and more specifically, to a concrete tower structure with a solid foundation and prestressed segmented arrangement. Background Technology

[0002] With the continuous development of the wind power industry, precast concrete segmental assembled hybrid towers are increasingly accounting for a larger share of wind towers due to their advantages such as high stability, strong adaptability, and low maintenance costs. Currently, the prestressing systems of mainstream wind power hybrid towers can be divided into internally bonded prestressing and externally unbonded prestressing. In both types of prestressing systems, the tensioning ends of the steel strands are located at the corbel position of the cavity within the foundation slab, while the fixing ends are located at the top pipe section.

[0003] Currently, the mainstream hybrid prestressed tower scheme has the following shortcomings:

[0004] First, because the foundation cavity needs to reserve enough space for the threading and tensioning of steel strands, the cross section of the foundation slab is weakened. The foundation needs to be thick enough, resulting in a large amount of reinforcement and concrete. The large self-weight of the foundation slab also leads to a large foundation bottom area.

[0005] Secondly, due to the limited space in the foundation cavity, it is difficult to thread the steel strands, and the steel strands often need to be tensioned individually, resulting in low tensioning efficiency.

[0006] Third, because the reinforcing bars at the tensioning end are relatively dense and the construction is carried out on-site, the quality of the concrete at the tensioning position cannot be guaranteed. In addition, the strength of the concrete poured on-site is also relatively low (generally C40), and the local compressive bearing capacity is low, which often leads to the concrete at the tensioning position being crushed during the tensioning process.

[0007] Fourth, most of the machine sites have high groundwater levels and often require flood control. Despite the implementation of numerous waterproofing measures, water seepage is inevitable in the foundation cavity, leading to corrosion of equipment such as bottom cables and ladders, and also hindering the corrosion protection of tensioning end steel strands and anchorages.

[0008] Therefore, there is an urgent need to design a prestressed, segmented concrete tower structure with a solid foundation to solve the above problems. Utility Model Content

[0009] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the prior art. The purpose of this utility model is to provide a solid foundation prestressed segmented concrete tower structure, which can effectively reduce the thickness of the foundation slab and the area of ​​the foundation, and significantly reduce the amount of concrete and steel reinforcement used.

[0010] To achieve the above objectives, this utility model provides a solid foundation prestressed segmented concrete tower structure, including a foundation base plate, lower pipe sections, upper pipe sections, and a top pipe section installed from bottom to top. The foundation base plate is a solid structure, and there are multiple upper pipe sections. The foundation base plate and the lower pipe sections are connected and reinforced by a lower prestressing system, and the lower pipe sections, upper pipe sections, and top pipe sections are connected and reinforced by an upper prestressing system. The lower and upper prestressing systems are arranged radially offset along the concrete tower, and the lower prestressing system is embedded in the foundation base plate and the lower pipe sections.

[0011] As a further improvement, the fixed end of the lower prestressing system is embedded in the foundation slab, and the tensioning end of the lower prestressing system is located at the top of the lower pipe section; the fixed end of the upper prestressing system is located at the top of the upper pipe section, and the tensioning end of the upper prestressing system is located in the lower pipe section.

[0012] Furthermore, the upper inner and outer sides of the lower pipe section are respectively provided with inner support platforms and outer support platforms extending radially therefrom. The tensioning end of the lower prestressing system is located at the top of the outer support platform, and the tensioning end of the upper prestressing system is located at the bottom of the inner support platform.

[0013] Furthermore, the axial height of the inner support platform is greater than the axial height of the outer support platform.

[0014] Furthermore, a settling groove is provided at the top of the lower pipe section corresponding to the lower prestressing system, and grout is poured into the settling groove after the lower prestressing system is installed.

[0015] Furthermore, the upper prestressed system is located inside the upper pipe section, and the width of the upper pipe section and the top pipe section gradually decreases from bottom to top.

[0016] Furthermore, the base plate is a disc that is thicker in the center and thinner away from the center, and the top of the disc protrudes to form a support platform, on which the lower pipe section is installed.

[0017] Furthermore, a groove is provided at the bottom of the disc on the inner side of the lower prestressed system.

[0018] Furthermore, the lower pipe section includes a transition pipe section and at least one bottom pipe section, wherein the bottom pipe section and the transition pipe section are installed from bottom to top, and the bottom pipe section is installed at the center of the foundation plate, and the upper pipe section is installed on top of the transition pipe section.

[0019] Furthermore, the foundation plate, bottom pipe section, upper pipe section, and top pipe section are all concrete pipe sections, and the transition pipe section is either a concrete pipe section or a steel flange.

[0020] Beneficial effects

[0021] Compared with the prior art, the advantages of this utility model are as follows:

[0022] 1. The concrete tower structure of this utility model has a solid foundation slab. The prestressing construction parts are all located in the lower pipe sections above the foundation slab, which provides more operating space. There is no need to reserve a foundation cavity, and there is no need to enter the cavity to carry out prestressing threading and tensioning work, which reduces labor intensity and improves prestressing construction efficiency. Moreover, the thickness of the foundation slab is the effective cross-sectional height, which can effectively reduce the thickness of the foundation slab and the area of ​​the foundation, and the amount of concrete and steel reinforcement can be significantly reduced. At the same time, there is no need to worry about water seepage in the foundation, and the thicker concrete protective layer is also beneficial to the corrosion protection of anchorages and steel strands.

[0023] 2. The concrete tower structure of this utility model has a prestressed system consisting of two parts. Generally, the control section of the concrete tower appears at the tip of the wind turbine blade and rarely at the bottom. Therefore, the number of steel strands in the lower prestressed system can be appropriately reduced, thereby reducing costs. At the same time, the staggered arrangement of the upper and lower prestressed systems provides more construction space, making construction more convenient, avoiding stress concentration problems, and further improving the reliability of the prestressed system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a cross-sectional structural diagram of the prestressed system in this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the foundation plate in this utility model. Figure 1 ;

[0027] Figure 4 This is a schematic diagram of the structure of the foundation plate in this utility model. Figure 2 ;

[0028] Figure 5 This is a schematic diagram of the transition pipe section in this utility model. Figure 1 ;

[0029] Figure 6 This is a schematic diagram of the transition pipe section in this utility model. Figure 2 .

[0030] Wherein: 1-Foundation slab, 2-Lower pipe section, 3-Upper pipe section, 4-Top pipe section, 5-Lower prestressed system, 6-Upper prestressed system, 7-Transition pipe section, 8-Bottom pipe section, 9-Ultra-high performance concrete layer, 101-Supporting platform, 102-Groove, 103-Nut, 201-Inner support platform, 202-Outer support platform, 203-Grouting. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0032] See Figure 1-3 5. This utility model discloses a solid foundation prestressed segmented concrete tower structure, comprising a foundation base plate 1, lower pipe section 2, upper pipe section 3, and top pipe section 4 installed from bottom to top. The foundation base plate 1 is a solid structure, eliminating the reserved indoor cavity found in conventional wind turbine hybrid tower foundation base plates. The lower pipe section 2, upper pipe section 3, and top pipe section 4 are all hollow cylindrical or polygonal tubes. Multiple upper pipe sections 3 are included to achieve the required height of the concrete tower. The inner cavity of the lower pipe section 2 serves as a construction space, providing a larger construction area.

[0033] The concrete tower structure of this utility model has a solid foundation slab 1. The prestressing construction parts are all located in the lower pipe section above the foundation slab, which provides more operating space. There is no need to reserve a foundation cavity, and there is no need to enter the cavity to carry out prestressing threading and tensioning work, which reduces labor intensity and improves prestressing construction efficiency. Moreover, the thickness of the foundation slab is the effective cross-sectional height, which can effectively reduce the thickness of the foundation slab and the area of ​​the foundation, and the amount of concrete and steel reinforcement can be significantly reduced. At the same time, there is no need to worry about water seepage in the foundation, and the thicker concrete protective layer is also beneficial to the corrosion protection of anchorages and steel strands.

[0034] The foundation slab 1 and the lower pipe section 2 are connected and reinforced by a lower prestressed system 5. The lower pipe section 2, upper pipe section 3, and top pipe section 4 are connected and reinforced by an upper prestressed system 6. Specifically, both the upper prestressed system 6 and the lower prestressed system 5 adopt existing prestressed anchoring systems, generally including steel strands and anchorages, which will not be elaborated here. The lower prestressed system 5 and the upper prestressed system 6 are arranged radially staggered along the concrete tower. Prestressed ducts are reserved in both the foundation slab 1 and the lower pipe section 2. The lower prestressed system 6 is embedded in the foundation slab 1 and the lower pipe section 2, which can further prevent the prestressed system 6 from being corroded.

[0035] The concrete tower structure of this utility model has a prestressed system consisting of two parts. Generally, the control section of the concrete tower appears at the tip of the wind turbine blade and rarely at the bottom. Therefore, the number of steel strands in the lower prestressed system can be appropriately reduced, thereby reducing costs. At the same time, the staggered arrangement of the upper and lower prestressed systems provides more construction space, making construction more convenient, avoiding stress concentration problems, and further improving the reliability of the prestressed system.

[0036] Specifically, the fixed end of the lower prestressing system 5 is embedded in the foundation slab 1. That is, the anchor plate and protective cover corresponding to the fixed end of the lower prestressing system 5 are integrated and embedded in the foundation slab 1 together with the spiral reinforcement and prestressing ducts. The tensioning end of the lower prestressing system 5 is located at the top of the lower pipe section 2. That is, the anchor plate, spiral reinforcement, anchor plate, and other anchorages corresponding to the tensioning end of the lower prestressing system 5 are arranged at the top of the lower pipe section 2. The fixed end of the upper prestressing system 6 is located at the top of the upper pipe section 4. That is, the anchor plate, spiral reinforcement, and other anchorages corresponding to the fixed end of the upper prestressing system 6 are arranged at the top of the upper pipe section 4. The tensioning end of the upper prestressing system 6 is located in the lower pipe section 2. That is, the anchor plate, spiral reinforcement, anchor plate, and other anchorages corresponding to the tensioning end of the upper prestressing system 6 are arranged in the lower pipe section 2. In this embodiment, the tensioning ends of both prestressing systems are integrated in the upper part of the lower pipe section 2 for ease of construction.

[0037] Preferably, an inner support platform 201 and an outer support platform 202 extending radially are respectively provided on the inner and outer sides of the upper part of the lower pipe section 2, so that the upper part of the lower pipe section 2 has a corbel structure. The tensioning end of the lower prestressing system 5 is located at the top of the outer support platform 202, and the tensioning end of the upper prestressing system 6 is located at the bottom of the inner support platform 201.

[0038] In this embodiment, the tensioning ends of both prestressing systems are integrated on the corbel structure of the lower pipe section 2. This can increase the top cross-sectional size of the lower pipe section 2, increase the local pressure-bearing area of ​​the concrete section, and improve the local pressure bearing capacity of the section. At the same time, it ensures that there is enough space to place the tensioning end anchorage and corresponding sinker of the lower prestressing system 5, and allows the pre-embedded prestressing ducts to be arranged vertically, which facilitates the tensioning construction of the steel strands and reduces the prestressing friction loss that is common in prestressed systems with internal bonding.

[0039] Preferably, the axial height of the inner support platform 201 is greater than the axial height of the outer support platform 202, further improving the structural strength at the bracket of the lower pipe section 2.

[0040] Preferably, a groove is provided at the top of the lower pipe section 2 corresponding to the lower prestressing system 5, and grout 203 is poured into the groove after the lower prestressing system 5 is installed. By setting the groove, the anchorages and steel strands of the lower prestressing system do not protrude from the top of the lower pipe section 2 after the prestressing is applied.

[0041] Preferably, the upper prestressed system 6 is located inside the upper pipe section 3, and the width of the upper pipe section 3 and the top pipe section 4 gradually decreases from bottom to top. Since the steel strands do not contact the tower wall, a steel strand deflector is not required, saving system costs.

[0042] Preferably, the foundation plate 1 is a disc that is thicker in the center and thinner in the distance from the center, and the top of the disc protrudes to form a support platform 101. The lower pipe section 2 is installed on the support platform 101, which can ensure the structural strength of the foundation plate 1 and provide better support for the tower.

[0043] like Figure 4 As shown, in other embodiments, a groove 102 is provided at the bottom of the disc inside the lower prestressed system 5, which can further reduce the amount of material used while meeting the support strength requirements.

[0044] Preferably, the lower pipe section 2 includes a transition pipe section 7 and at least one bottom pipe section 8, wherein the bottom pipe section 8 and the transition pipe section 7 are installed from bottom to top, and the bottom pipe section 8 is installed at the center of the foundation plate 1. The upper pipe section 3 is installed on top of the transition pipe section 7, and the corbel structure corresponding to the lower pipe section 2 is located on the transition pipe section 8. The function of the bottom pipe section 8 is to raise the transition pipe section 7 to a suitable height to ensure sufficient space for tensioning the steel strands. When the tower has flood control requirements, it can also be set according to the flood level. The total height can be adjusted by increasing or decreasing the number of bottom pipe sections 8 so that the tensioning end of the prestressed system is always above the flood level.

[0045] Preferably, the foundation slab 1, bottom pipe section 8, upper pipe section 3, and top pipe section 4 are all concrete pipe sections, which have the characteristics of high stability, strong adaptability, and low maintenance cost. The transition pipe section 7 is a concrete pipe section or a steel flange. When the transition pipe section 7 is made of concrete, it should be made of high-strength concrete, which can effectively improve the local compressive bearing capacity at the tensioning position, such as... Figure 6 As shown, the top of the transition pipe section 7 can also be locally constructed using ultra-high performance concrete 9 (UHPC) to further improve the local pressure bearing capacity of the cross section. When the transition pipe section is a steel flange, the flange must have flange holes on both the inner and outer rings to stagger the installation of the upper and lower prestressed systems. For the transition section with a steel flange, there is no need to install anchor plates or spiral reinforcement structures.

[0046] During the construction process of the concrete tower structure of this utility model:

[0047] (1) When making the foundation slab 1, the anchor plate corresponding to the fixed end of the lower prestressed system 5 is combined with the protective cover and embedded in the foundation slab 1 together with the spiral reinforcement.

[0048] (2) Hoist the lower pipe section 2 to align the prestressed duct of the lower pipe section 2 with the prestressed duct of the foundation plate 1, and check the alignment of the duct.

[0049] (3) Insert the steel strands of the lower prestressed system from the top of the lower pipe section 2 and fix them into the foundation plate 1. Install anchors at the upper end of the lower pipe section 2 and tension and anchor them.

[0050] (4) Hoist the upper pipe section 3 and the top pipe section 4, and then thread the steel strands of the upper prestressed system 6. When threading the strands, thread them from bottom to top along the lower end of the prestressed duct and complete the tensioning and anchoring.

[0051] (5) Grouting is performed on the lower prestressed system 5.

[0052] In step (5), a connecting hole is set in the bottom segment 8 to connect with the corresponding prestressed duct. At the same time, a grout outlet is set at the upper end of the bottom segment 8, and a grouting hole is set in the connecting hole. This can realize the grouting of multiple prestressed holes and complete the grouting of the lower prestressed system 5.

[0053] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these will not affect the implementation effect of this utility model or the practicality of the patent.

Claims

1. A prestressed, segmented concrete tower structure with a solid foundation, characterized in that, The structure includes a base plate (1), a lower pipe section (2), an upper pipe section (3), and a top pipe section (4) installed from bottom to top. The base plate (1) is a solid structure. There are multiple upper pipe sections (3). The base plate (1) and the lower pipe section (2) are connected and reinforced by a lower prestressing system (5). The lower pipe section (2), the upper pipe section (3), and the top pipe section (4) are connected and reinforced by an upper prestressing system (6). The lower prestressing system (5) and the upper prestressing system (6) are arranged radially offset along the concrete tower. The lower prestressing system (5) is embedded in the base plate (1) and the lower pipe section (2).

2. The solid foundation prestressed segmented concrete tower structure according to claim 1, characterized in that, The fixed end of the lower prestressing system (5) is embedded in the foundation slab (1), and the tensioning end of the lower prestressing system (5) is located at the top of the lower pipe section (2); the fixed end of the upper prestressing system (6) is located at the top of the top pipe section (4), and the tensioning end of the upper prestressing system (6) is located in the lower pipe section (2).

3. A prestressed, segmented concrete tower structure with a solid foundation as described in claim 2, characterized in that, The upper inner and outer sides of the lower pipe section (2) are respectively provided with an inner support platform (201) and an outer support platform (202) extending radially therefrom. The tensioning end of the lower prestressing system (5) is located at the top of the outer support platform (202), and the tensioning end of the upper prestressing system (6) is located at the bottom of the inner support platform (201).

4. A prestressed, segmented concrete tower structure with a solid foundation as described in claim 3, characterized in that, The axial height of the inner support platform (201) is greater than the axial height of the outer support platform (202).

5. A prestressed, segmented concrete tower structure with a solid foundation as described in claim 2, characterized in that, The lower section of the prestressed system (5) has a sinkhole at the top of the lower pipe section (2). After the lower section of the prestressed system (5) is installed, the sinkhole is filled with grout (203).

6. A prestressed, segmented concrete tower structure with a solid foundation as described in claim 1, characterized in that, The upper prestressed system (6) is located inside the upper pipe section (3), and the width of the upper pipe section (3) and the top pipe section (4) gradually decreases from bottom to top.

7. A prestressed, segmented concrete tower structure with a solid foundation according to claim 1, characterized in that, The base plate (1) is a disc that is thick in the center and thin away from the center, and the top of the disc protrudes to form a support platform (101), and the lower pipe section (2) is installed on the support platform (101).

8. A prestressed, segmented concrete tower structure with a solid foundation as described in claim 7, characterized in that, The bottom of the disc inside the lower prestressed system (5) has a groove (102).

9. A prestressed, segmented concrete tower structure with a solid foundation according to any one of claims 1-8, characterized in that, The lower pipe section (2) includes a transition pipe section (7) and at least one bottom pipe section (8). The bottom pipe section (8) and the transition pipe section (7) are installed from bottom to top, and the bottom pipe section (8) is installed at the center of the foundation plate (1). The upper pipe section (3) is installed on top of the transition pipe section (7).

10. A prestressed, segmented concrete tower structure with a solid foundation according to claim 9, characterized in that, The foundation plate (1), bottom pipe section (8), upper pipe section (3), and top pipe section (4) are all concrete pipe sections, and the conversion pipe section (7) is a concrete pipe section or a steel flange.

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