Solar tower with variable cross-section and variable slope mixed reinforcement with spiral stirrups

Abstract

This invention provides a solar thermal power generation tower with variable cross-section and variable slope hybrid reinforcement featuring spiral stirrups, comprising a tower body, a steel reinforcement cage, and top embedded parts. Both the steel reinforcement cage and the top embedded parts are embedded within the tower body. The top embedded parts connect to the upper steel structure system of the heat-absorbing tower. The lower and upper parts of the tower body are cast using UHPC (Ultra-High-Pressure Polymer), while the middle part is cast using conventional concrete, with the strength grade of the conventional concrete being lower than that of the UHPC. The reinforcement cage includes two layers: an outer layer composed of FRP spiral stirrups and FRP longitudinal bars, and an inner layer composed of longitudinal steel bars and steel spiral stirrups. The cross-sectional area of ​​the tower body gradually decreases along its height, and the outer surface of the tower body gradually tapers from bottom to top. The UHPC casting provides sufficient load-bearing capacity for the upper structure, while the outer reinforcement cage uses FRP material to improve the corrosion resistance and tensile strength of the tower structure, reduce steel usage, and ensure the stability of the tower structure.

Description

Technical Field

[0001] This invention relates to the field of solar thermal power generation technology, and more specifically, to a solar thermal power generation tower with variable cross-section and variable slope hybrid reinforcement with spiral stirrups. Background Technology

[0002] In solar thermal power generation systems, the solar thermal power tower is an extremely important component. Among the existing solar thermal power tower structures both domestically and internationally, the following structural forms are basically available:

[0003] Firstly, when using a steel structure system for solar thermal power generation towers, a frame-braced structure should be adopted. The structural columns are generally made of round tubes or H-beams, with a polygonal, hexagonal, or octagonal plan layout. Steel platforms are installed at regular intervals to increase overall rigidity. The platform beams can use I-beam sections, and cross-bracing is used between columns. The bracing sections can also be round tubes or H-beams. To reduce the impact of wind loads, the structure does not require external enclosure. Advantages: Simple on-site construction; factory processing and on-site assembly significantly shorten the construction period. Disadvantages: For taller absorber towers, the overall structural rigidity is relatively low, making it difficult to meet the manufacturer's requirements for tower top displacement; additionally, it consumes a large amount of steel.

[0004] Secondly, when using concrete structures for solar thermal power generation towers, the main body is generally a tall, circular cylindrical structure. Advantages: The construction method is relatively simple; the slipform method can be used for the concrete cylinder, and its construction technology is relatively mature; the structure is enclosed, possessing good rigidity and seismic resistance; the project cost is relatively low; the cost of corrosion prevention and maintenance during operation is low; the construction technology of reinforced concrete heat absorption towers is mature, resulting in strength, durability, good fire resistance, and low investment cost. Characteristics: It has strong adaptability to disaster environments, good structural integrity, and is conducive to resisting earthquakes, wind loads, and explosive impacts; it is suitable for tall structures. Disadvantages: It has a large self-weight, a long construction period, and in some areas, concrete materials are difficult to obtain; winters are cold and the location is in a windy area, making concrete construction more difficult. Summary of the Invention

[0005] In view of the above-mentioned defects of the prior art, the purpose of this invention is to provide a solar thermal power generation tower that is corrosion resistant, consumes less steel, has a large load-bearing capacity, and has good seismic resistance, impact resistance and deformation performance.

[0006] To achieve the above objectives, the present invention provides a solar thermal power generation tower with variable cross-section and variable slope mixed reinforcement with spiral stirrups, including a tower body, a steel reinforcement frame and a top embedded part, wherein the steel reinforcement frame and the top embedded part are both embedded in the tower body.

[0007] The top embedded part is used to connect the steel structure system at the top of the heat absorption tower;

[0008] The lower and upper parts of the tower body are cast with UHPC, and the middle part of the tower body is cast with conventional concrete. The strength grade of the conventional concrete is lower than that of the UHPC.

[0009] The reinforcement skeleton adopts a double-helix hybrid reinforcement structure and includes two layers of reinforcement cage skeletons, an outer layer of reinforcement cage skeleton is made of FRP spiral stirrups and FRP longitudinal bars tied together, and an inner layer of reinforcement cage skeleton is made of longitudinal bars and steel spiral stirrups tied together.

[0010] The cross-sectional area of ​​the tower body gradually decreases upward along the height direction. The outer surfaces of the lower, middle and upper parts gradually become thinner upward along the height direction, and the inclination of the outer surfaces of these three parts is different. The angle between the outer surfaces of the lower, middle and upper parts and the ground gradually increases.

[0011] The UHPC concrete pouring uses ultra-high performance concrete with a strength grade between C100 and C160. The upper part extends downward from the top surface of the tower along the tower axis, and the extension length is 2 to 4 times the outer diameter of the top surface of the tower.

[0012] The lower part extends upward from the bottom end face of the tower along the tower axis, and the extension length is 2 to 4 times the outer diameter of the bottom end face of the tower.

[0013] The strength grade of conventional concrete pouring is between C35 and C80.

[0014] Furthermore, the outer reinforcing cage skeleton is made of FRP spiral stirrups wrapped around the outside of the FRP longitudinal bars, and the inner reinforcing cage skeleton is made of steel spiral stirrups wrapped around the inside of the longitudinal bars.

[0015] Furthermore, both the upper and lower parts are reinforced sections with FRP spiral stirrups and steel spiral stirrups, and the outer protective layer thickness of the solar thermal power generation tower is 50mm.

[0016] Furthermore, the FRP longitudinal bars and longitudinal steel bars are respectively configured as several bars distributed in a circumferential array.

[0017] The beneficial effects of this invention are as follows:

[0018] Because the lower part of the tower body adopts a reinforced concrete structure cast with UHPC, the freeze-thaw resistance and corrosion resistance of the lower tower are greatly improved, providing sufficient load-bearing capacity for the upper tower structure. The double-helix hybrid reinforcement structure of the reinforcing cage effectively improves the overall integrity compared with the ordinary stirrup structure. The outer reinforcement cage adopts a new FRP material, which improves the corrosion resistance and tensile strength of the cylinder structure and reduces the amount of steel used, making the tower structure more stable than existing towers, thereby greatly improving the service life of the components. In addition, this invention has a large load-bearing capacity and good seismic and impact resistance.

[0019] The tower adopts a reinforced concrete structure with variable cross-section and variable slope mixed reinforcement with spiral hoops. The outer reinforcement cage uses FRP spiral hoops wrapped around the outside of FRP longitudinal bars, which improves the tensile strength and corrosion resistance of the component skeleton and saves about 40% of steel compared with existing towers, thereby greatly reducing energy consumption. In addition, the new tower proposed in this invention has a large load-bearing capacity and good seismic resistance, impact resistance and deformation performance.

[0020] Because the tower adopts a double-helix structure of FRP spiral stirrups and steel spiral stirrups, and the lower and upper parts are cast with UHPC concrete, the strength, rigidity and stability of the components are enhanced, thereby greatly extending the service life of the tower. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the solar thermal power generation tower disclosed in this invention;

[0023] Figure 2 This is a schematic diagram of the outer reinforcing cage structure disclosed in this invention;

[0024] Figure 3 This is a schematic diagram of the inner layer rib cage skeleton disclosed in this invention;

[0025] Figure 4 yes Figure 1 Cross-sectional view at point AA;

[0026] Figure 5 yes Figure 1 Cross-sectional view at BB;

[0027] Figure 6 yes Figure 1 Cross-sectional view at CC;

[0028] Figure 7 yes Figure 1 Cross-sectional view at DD;

[0029] Figure 8 This is a front view structural schematic diagram of the first embedded part disclosed in this invention;

[0030] Figure 9 This is a front view structural schematic diagram of the first embedded part disclosed in this invention;

[0031] Figure 10This is a front view structural schematic diagram of the second embedded part disclosed in this invention;

[0032] Figure 11 This is a front view structural schematic diagram of the second embedded part disclosed in this invention.

[0033] 1. FRP spiral stirrups; 2. Steel spiral stirrups; 3. FRP longitudinal reinforcement; 4. Longitudinal reinforcement; 5. Conventional concrete; 6. UHPC concrete; 7. First embedded part; 8. Second embedded part. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present 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 the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals or letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] like Figure 1-11 The solar thermal power generation tower shown includes a tower body, a steel frame, and a top embedded part, with the steel frame and the top embedded part both embedded in the tower body.

[0037] The top embedded parts are used to connect the upper steel structure system of the heat absorption tower; the top embedded parts include multiple second embedded parts 8 evenly distributed along the circumference of the tower body and multiple first embedded parts 7 evenly distributed along the circumference, such as... Figure 8-11 As shown, the top embedded part provides the installation foundation for the steel structure system.

[0038] The lower and upper parts of the tower body are cast with UHPC concrete 6, and the middle part of the tower body is cast with conventional concrete 5. The strength grade of the conventional concrete is lower than that of the UHPC concrete.

[0039] The reinforcement cage adopts a double-helix mixed reinforcement structure and includes two layers of reinforcement cages, an outer layer of reinforcement cages, an inner layer of reinforcement cages, an outer layer of reinforcement cages, an inner layer of reinforcement cages, an inner layer of reinforcement cages, an inner layer of reinforcement cages, a longitudinal steel bar, a steel bar spiral stirrup, and a steel bar spiral stirrup, a inner layer of reinforcement cages.

[0040] The cross-sectional area of ​​the tower body gradually decreases upwards along the height direction. The outer surfaces of the lower, middle, and upper sections gradually taper upwards along the height direction, and the inclination of the outer surfaces of these three sections differs. The angle between the outer surfaces of the lower, middle, and upper sections and the ground (or horizontal plane) gradually increases, and this angle is an acute angle. That is, the outer surface of the upper section is almost vertical, the outer surface of the lower section forms a gentler slope, and the outer surface of the middle section forms a steeper slope than the lower section.

[0041] This invention discloses a novel solar thermal power generation tower with variable cross-section and variable slope hybrid reinforcement and spiral stirrups. The tower adopts a structure with variable cross-section and variable slope hybrid reinforcement and includes a layer of hybrid reinforced concrete. The lower and upper hybrid reinforced concrete layers of the tower are cast using UHPC concrete 6, while the middle concrete layer is cast using conventional concrete 5. The reinforcement skeleton in the tower concrete is configured as follows: the outer layer is composed of an outer reinforcement cage skeleton formed by FRP spiral stirrups 1 wrapped around the outside of FRP longitudinal reinforcement 6, and the inner layer is composed of an inner reinforcement cage skeleton formed by steel spiral stirrups 2 wrapped around the inside of ordinary longitudinal reinforcement 4. The top is connected to the upper structure of the heat-absorbing tower through embedded first pre-embedded parts 7 and second pre-embedded parts 8. Because the tower uses a hybrid reinforcement structure of FRP (fiberglass reinforced plastic) and ordinary steel bars, it saves about 40% of steel compared to existing towers, thus significantly reducing energy consumption. The outer mesh structure of the reinforcement skeleton uses FRP bars, while the inner mesh structure uses ordinary steel bars, greatly improving the structural integrity, corrosion resistance, and overall strength. Furthermore, the tower has a high load-bearing capacity and excellent seismic, impact, and deformation resistance. The corrosion resistance of FRP bars also significantly extends the service life of the tower.

[0042] It has the advantages of good stability, good durability, low steel consumption, high load-bearing capacity, good seismic resistance, impact resistance and deformation performance, and long service life, making it particularly suitable for solar thermal power generation systems.

[0043] Preferably, the UHPC concrete pouring uses ultra-high performance concrete with a strength grade between C100 and C160, and the upper part extends downward along the tower axis from the top surface of the tower, with an extension length of 2 to 4 times the outer diameter of the top surface of the tower.

[0044] The lower part extends upwards along the tower's axial direction from the bottom end face of the tower, with an extension length of 2 to 4 times the outer diameter of the tower's bottom end face; the strength grade of the conventional concrete pouring is between C35 and C80. Determining the dimensional relationship between the upper or lower part and the outer diameter of the top or bottom surface of the solar thermal power generation tower facilitates an overall improvement in the tensile strength of the solar thermal power generation tower, resulting in a more stable overall structure.

[0045] Preferably, the outer layer of the reinforcing cage is made of FRP spiral stirrups wrapped around the outside of the FRP longitudinal bars, and the inner layer of the reinforcing cage is made of steel spiral stirrups wrapped around the inside of the longitudinal bars.

[0046] Both the upper and lower sections are reinforced with FRP spiral stirrups and steel spiral stirrups. The outer protective layer thickness of the upper, middle, and lower sections of the tower is 50mm. The spacing of the FRP spiral stirrups in the upper and lower sections is smaller than that in the middle section, and the spacing of the steel spiral stirrups in the upper and lower sections is smaller than that in the middle section. The FRP spiral stirrups and steel spiral stirrups in the upper and lower sections have been reinforced with denser reinforcement.

[0047] The outer and inner protective layers of the solar thermal power generation tower are 50mm thick. The outer protective layer thickness is the distance from the outer wall of the FRP spiral stirrup to the outer concrete surface of the tower, and the inner protective layer thickness is the distance from the inner wall of the steel spiral stirrup to the inner concrete surface of the tower.

[0048] Preferably, the FRP longitudinal bars and longitudinal steel bars are respectively set as several bars distributed in a circumferential array.

[0049] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0050] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A solar thermal power generation tower with a spiral stirrup variable cross-section variable slope hybrid reinforcement, characterized in that, The tower body, the steel reinforcement cage and the top embedded part are embedded in the tower body; The top embedded part is used to connect the steel structure system of the upper part of the heat absorption tower; The lower part and the upper part of the tower body are poured with UHPC concrete, and the middle part of the tower body is poured with conventional concrete, and the strength grade of the conventional concrete is lower than that of the UHPC concrete. The steel reinforcement cage adopts a double spiral mixed reinforcement structure and includes an inner and outer two-layer reinforcement cage structure, the outer reinforcement cage structure is made of FRP spiral stirrups and FRP longitudinal reinforcement, and the inner reinforcement cage structure is made of longitudinal steel and steel spiral stirrups. The cross-sectional area of the tower body gradually decreases along the height direction, the lower part, the middle part and the upper part gradually taper along the height direction, and the outer surfaces of the three parts have different inclination degrees, and the included angles between the outer surfaces of the lower part, the middle part and the upper part and the ground gradually increase.

2. The solar tower with helical stirrups, variable cross-section and variable slope hybrid reinforcement according to claim 1, characterized in that, The UHPC concrete pouring adopts super high performance concrete with a strength grade between C100 and C160, the upper part extends downward along the tower axis from the top end surface of the solar thermal power tower, and the extension length is 2 to 4 times the outer diameter of the top end surface of the solar thermal power tower; The lower part extends upward along the tower axis from the bottom end surface of the solar thermal power tower, and the extension length is 2 to 4 times the outer diameter of the bottom end surface of the solar thermal power tower. The strength grade of the conventional concrete pouring is between C35 and C80.

3. The solar tower with helical stirrups, variable cross-section and variable slope hybrid reinforcement according to claim 1, characterized in that, The outer reinforcement cage structure is wound outside the FRP longitudinal reinforcement by the FRP spiral stirrups, and the inner reinforcement cage structure is wound inside the longitudinal steel by the steel spiral stirrups.

4. The solar tower with helical stirrups, variable cross-section and variable slope hybrid reinforcement according to claim 1, characterized in that, The upper part and the lower part are both FRP spiral stirrups and steel spiral stirrups encryption sections, and the outer protective layer of the solar thermal power tower has a thickness of 50mm.

5. The solar tower with helical stirrups, variable cross-section and variable slope hybrid reinforcement according to claim 1, characterized in that, The FRP longitudinal reinforcement and the longitudinal steel are respectively arranged as a circumferential array of several roots.

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