An assembled concrete self-resetting rocking solar heat absorption tower structure system

Abstract

The application belongs to the field of structural seismic resistance and relates to a fabricated concrete self-resetting rocking solar heat absorption tower structure system. The tower body comprises a bottom energy dissipation ring-shaped tower section and segmented precast concrete ring-shaped tower sections located above the bottom energy dissipation ring-shaped tower section, and a rocking interface is formed between the bottom energy dissipation ring-shaped tower section and the foundation. The energy dissipation device comprises a plurality of speed-dependent energy dissipaters arranged at intervals in the circumferential direction of the bottom energy dissipation ring-shaped tower section, and the energy dissipaters are preferably viscous dampers, the upper ends of which are connected to the bottom energy dissipation ring-shaped tower section and the lower ends of which are connected to the foundation. The precast concrete ring-shaped tower sections are assembled by arc-shaped precast concrete segments through arc-shaped bolts, vertical joints are formed between adjacent segments, and horizontal joints are formed between adjacent tower sections. Vertical unbonded prestressed tendons are arranged inside the tower body, the bottom ends of which are anchored in the foundation and the top ends of which are anchored in the concrete tower top anchoring area. The application can realize controllable rocking, energy dissipation and shock absorption and post-earthquake self-resetting, and can improve the efficiency of fabricated construction and the high-temperature sealing performance of joints.

Description

Technical Field

[0001] This invention belongs to the field of structural earthquake resistance, specifically relating to a prefabricated concrete self-resetting swaying structure system suitable for solar heat absorption towers. Background Technology

[0002] A solar thermal tower is the core, tall structure in a tower-type solar thermal power generation system, typically used to support the absorber at the top of the tower and its auxiliary equipment. Existing solar thermal towers mainly adopt cast-in-place concrete cylindrical structures or steel-concrete hybrid structures.

[0003] Cast-in-place concrete heat absorption towers typically suffer from long construction periods, large amounts of on-site wet work, numerous high-altitude operations, and high difficulty in quality control. Under seismic loads, traditional structures primarily rely on concrete cracking, steel bar yielding, and plastic deformation of other structural components to dissipate seismic energy. After a strong earthquake, they are prone to significant residual deformation or localized damage, making post-earthquake inspection, repair, and functional restoration difficult, and exhibiting insufficient seismic toughness.

[0004] Self-resetting swaying structures can reduce plastic damage to the main structure through relative rotation between the structure and the foundation, and provide post-earthquake recovery force using prestressed components, thus they have been studied and applied in some structural engineering projects. However, solar thermal towers are characterized by large structural height, slender tower bodies, concentrated equipment at the top, and significant influence from higher-order vibration modes, which places high demands on structural sway response control, energy dissipation capacity, and post-earthquake recovery performance. Simply setting up a sway interface without a suitable energy dissipation structure may make it difficult to effectively control the tower's sway amplitude and seismic response.

[0005] Furthermore, solar absorber towers typically house absorbers and high-temperature media pipelines at their top, placing the tower body in a complex operating environment for extended periods. When using prefabricated assembled tower bodies, multiple joints are formed between the curved prefabricated concrete segments and between adjacent tower sections. These joints must not only meet structural connection requirements but also possess sealing capabilities to adapt to temperature changes and localized deformations. Existing structural systems struggle to simultaneously achieve seismic damage control, post-earthquake self-resetting, prefabricated construction, and high-temperature sealing and durability of the joints.

[0006] Therefore, it is necessary to propose a prefabricated concrete self-resetting swaying structure system suitable for solar heat absorption towers to improve the shortcomings of existing technologies in terms of seismic damage control, seismic energy dissipation, post-earthquake functional recovery, prefabricated construction, and adaptability to high-temperature environments. Summary of the Invention

[0007] To address the problems of existing solar heat absorber towers, such as significant structural damage and residual deformation under strong earthquakes, difficulties in post-earthquake repair and functional recovery, long construction cycles for cast-in-place structures, numerous on-site wet and high-altitude operations, and insufficient high-temperature sealing performance of prefabricated tower joints, this invention provides a prefabricated concrete self-resetting swaying solar heat absorber tower structural system. This system, through the coordinated operation of the swaying interface, energy dissipation device, and post-tensioned vertical prestressing system, enables the tower body to sway controllably under earthquakes. The energy dissipation device dissipates the earthquake input energy, and after the earthquake, the self-resetting is achieved by the restoring force provided by the unbonded vertical prestressing tendons. This reduces structural damage and post-earthquake residual deformation, improving the seismic toughness and post-earthquake functional recovery capability of the solar heat absorber tower. Simultaneously, the prefabricated tower body, formed by precast concrete annular tower sections and arc-shaped precast concrete segments, improves construction efficiency, assembly accuracy, and controllability of construction quality.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: the prefabricated concrete self-resetting swaying solar heat absorption tower structure system includes a foundation, a heat absorption tower body, an energy dissipation device, and a prestressing system.

[0009] The heat absorption tower body includes a bottom energy-consuming annular tower section at the bottom and multiple precast concrete annular tower sections above the bottom energy-consuming annular tower section. The bottom energy-consuming annular tower section and the multiple precast concrete annular tower sections are assembled and fixed sequentially from bottom to top along the same vertical central axis.

[0010] A swaying interface is formed between the bottom surface of the bottom energy-dissipating annular tower section and the top surface of the foundation.

[0011] The tower body is an upper structure located above the swaying interface and capable of swaying relative to the foundation as a whole; the tower body includes the heat-absorbing tower body, a concrete tower top anchoring area set at the top of the heat-absorbing tower body, and an upper structure that is fixedly connected to the heat-absorbing tower body and moves together with it.

[0012] The outer wall of the bottom energy-consuming annular tower section is provided with multiple recessed pre-installed slots at intervals along the circumference; the energy-consuming device includes multiple speed-dependent energy-consuming devices, which are arranged at intervals along the circumference of the bottom energy-consuming annular tower section and respectively installed in the corresponding pre-installed slots; each speed-dependent energy-consuming device is arranged across the swaying interface, with its upper end connected to the bottom energy-consuming annular tower section and its lower end connected to the foundation, so as to generate energy-consuming effect when the tower body sways relative to the foundation.

[0013] The prestressing system includes multiple vertical unbonded prestressing tendons, which are arranged in the middle space enclosed by the heat absorption tower body and spaced apart around the circumference of the heat absorption tower body. The bottom of the vertical unbonded prestressing tendons is anchored to the foundation, and the top is tensioned and anchored to the concrete tower top anchorage area so as to provide restoring force to the tower body after it sways.

[0014] The concrete tower top anchorage zone is a concrete cover ring set at the top of the heat absorption tower body for tensioning and anchoring vertical unbonded prestressing tendons.

[0015] Based on the above technical features: each precast concrete annular tower segment is assembled into a closed ring by multiple arc-shaped precast concrete segments along the circumference using arc bolts.

[0016] Vertical joints are formed between adjacent curved precast concrete segments, and high-temperature resistant elastic sealant is applied to the vertical joints.

[0017] Between adjacent precast concrete annular tower sections, and between the bottom energy-consuming annular tower section and the upper precast concrete annular tower section, a tongue-and-groove joint is formed using an interlocking structure, creating a horizontal joint. High-temperature resistant resin adhesive is applied to the horizontal joint, and high-temperature resistant elastic sealant is applied to the inner and outer edges of the horizontal joint.

[0018] Based on the above technical features: a highly ductile material layer is provided on the swing interface.

[0019] Based on the above technical characteristics: the high-ductility material layer is formed by high-ductility concrete.

[0020] Based on the above technical features: the reserved installation groove is recessed inward along the outer wall of the bottom energy-consuming annular tower section and extends downward to the bottom surface of the bottom energy-consuming annular tower section; multiple speed-related energy consumers are respectively installed in the corresponding reserved installation grooves, with the upper end of each speed-related energy consumer connected to the bottom energy-consuming annular tower section and the lower end connected to the top surface of the foundation.

[0021] Based on the above technical characteristics: the velocity-dependent energy dissipator is a viscous damper; the end connection structure of the viscous damper includes an upper connection part and a lower connection part. The upper connection part is located on the side wall of the reserved installation slot, and the lower connection part is located on the top surface of the foundation. The upper end of the viscous damper is connected to the bottom energy dissipation annular tower section through the upper connection part, and the lower end of the viscous damper is connected to the foundation through the lower connection part.

[0022] Based on the above technical features: the external part of the vertical unbonded prestressed tendons is equipped with a high-temperature resistant protective sleeve.

[0023] The force-bearing principle of this invention is to form a synergistic earthquake-resistant mechanism through controllable swaying, energy-dissipating damping, and prestressed self-resetting, as detailed below: (1) Controllable swing and energy dissipation mechanism A swaying interface is formed between the bottom surface of the bottom energy-dissipating annular tower section and the top surface of the foundation. Under seismic action, the tower body located above the swaying interface can undergo controlled rotational swaying around the swaying interface. The swaying interface alternately opens, closes, and is subjected to compressive contact, causing structural deformation to be mainly concentrated near the bottom swaying interface, thereby reducing the risk of irreversible plastic damage to the main load-bearing parts of the heat absorption tower.

[0024] Except for the vertical unbonded prestressed tendons and the connection structures required for the operation of the energy dissipation device, no through ordinary longitudinal steel bars or bonded connection structures are provided at the sway interface to rigidly connect the bottom energy dissipation annular tower section to the foundation, so as to ensure that the tower body can perform the expected swaying motion relative to the foundation.

[0025] The foundation can be configured with appropriate radial bearing capacity based on the tower load and sway response requirements to increase the effective bearing area at the sway interface and reduce the risk of local contact compressive stress and local concrete crushing during seismic swaying. When the tower sways relative to the foundation due to seismic action, the velocity-dependent energy dissipator bridging the bottom energy-dissipating annular tower section and the foundation undergoes relative motion and generates damping force, thereby dissipating the seismic input energy and controlling the tower's sway amplitude and dynamic response.

[0026] When a velocity-dependent energy dissipator uses a viscous damper, the viscous damper generates damping force through the relative motion of its two ends. During the process of partial opening on one side of the swaying interface and compressive contact on the other side, the viscous damper expands and contracts with the relative displacement between the bottom energy-dissipating annular tower section and the foundation, thereby continuously dissipating the seismic input energy. At the same time, the swaying motion of the tower can convert some of the seismic input energy into the gravitational potential energy of the tower and the elastic strain energy of the vertical unbonded prestressing tendons, reducing the need for the main load-bearing parts of the tower to dissipate energy through their own plastic deformation.

[0027] (2) Prestressed self-resetting mechanism: Multiple vertical unbonded prestressed tendons are anchored at the bottom to the foundation and tensioned and anchored at the top of the concrete tower, forming a post-tensioned vertical prestressed system that runs through the height of the tower. During an earthquake, as the tower sways around the sway interface, the vertical unbonded prestressed tendons elastically elongate and store elastic strain energy as the tower rises and rotates. The tension generated by the vertical unbonded prestressed tendons simultaneously exerts a constraint on the tower towards the foundation and generates a restoring moment that causes the tower to return to its initial vertical position. After the earthquake, the vertical unbonded prestressed tendons release their stored elastic strain energy, and their elastic restoring force drives the tower to return to its initial vertical position, thereby reducing residual tilt and deformation after the earthquake and improving the load-bearing capacity and operational recovery capability of the solar thermal tower.

[0028] The energy dissipation device is mainly used to dissipate the seismic input energy and control the tower's sway response, while the vertical unbonded prestressed tendons are mainly used to provide restoring force and self-resetting capability. Together with the sway interface, they enable the tower to allow for controlled swaying while avoiding excessive sway amplitude, and to return to a near-initial state after the earthquake ends.

[0029] (3) Prefabricated construction mechanism The heat absorption tower body adopts a staged assembly structure. Multiple arc-shaped precast concrete tube segments are connected along the circumference by arc-shaped bolts to form a closed precast concrete annular tower segment. Multiple precast concrete annular tower segments are then assembled vertically to form the heat absorption tower body.

[0030] The aforementioned structure facilitates the factory production and on-site assembly of curved precast concrete segments and related tower components, reducing wet operations such as on-site formwork, rebar tying, and concrete pouring, and also reducing the workload of continuous high-altitude cast-in-place construction. This shortens the construction cycle and improves the dimensional accuracy of components and the controllability of construction quality. The bottom energy-dissipating annular tower segment integrates energy-dissipating devices through pre-reserved installation slots, making the arrangement, installation space, and connection relationships of energy-dissipating components clearer. This facilitates the positioning and installation of energy-dissipating devices during the construction phase and allows for easy inspection of the working status of energy-dissipating devices and their connections during the operation phase.

[0031] (4) High-temperature sealing and durability mechanism The top of a solar heat absorption tower is usually equipped with a heat absorber, high-temperature medium pipelines and related equipment, which places high demands on the sealing performance of the tower joints and the adaptability to the operating environment.

[0032] High-temperature resistant elastic sealant is applied to the vertical joints between adjacent curved precast concrete segments; the horizontal joints between adjacent tower segments are connected by tongue and groove joints with interlocking grooves, and high-temperature resistant resin adhesive is applied to the joints, with high-temperature resistant elastic sealant applied to the inner and outer edges of the horizontal joints.

[0033] The interlocking structure improves the positioning capability and joint stability between adjacent tower sections. The high-temperature resistant resin adhesive is used to improve the adhesion and integrity of the joint. The high-temperature resistant elastic sealant is used to improve the sealing performance of the joint and adapt to temperature changes and local structural deformation.

[0034] The aforementioned joint structure reduces the risk of rainwater, dust, high-temperature airflow, and corrosive media entering the tower body along the joints. Furthermore, it reduces the risk of molten salt and other high-temperature media entering the tower body along the joints during abnormal leaks, splashes, or maintenance discharges from the tower top absorber or high-temperature medium pipelines. The high-temperature resistant protective sleeves installed on the outside of the vertical unbonded prestressing tendons further reduce the adverse effects of high-temperature environments and corrosive media on the long-term performance of the prestressing system.

[0035] Compared with the prior art, the present invention has the following beneficial effects: (1) Good seismic damage control capability. The bottom sway interface allows the tower body to sway controllably under seismic action, concentrating the main deformation near the predetermined bottom sway interface, reducing the energy consumption demand of the main load-bearing parts of the heat absorption tower body relying on plastic deformation, thereby reducing the risk of serious damage to the main structure under strong earthquake action.

[0036] (2) Good seismic energy dissipation capability. The energy dissipation device is connected between the bottom energy dissipation annular tower section and the foundation. It can dissipate the seismic input energy by utilizing the relative displacement generated during the tower's swaying process, control the tower's swaying amplitude and dynamic response, and reduce the risk of local pressure damage at the swaying interface and plastic damage to the tower body.

[0037] (3) Good self-resetting ability after earthquake. The vertical unbonded prestressed tendons generate elastic elongation and store elastic strain energy during the swaying process of the tower. After the earthquake, they provide restoring torque to the tower through their elastic restoring force, reduce the residual deformation of the tower after the earthquake, and improve the recovery ability of the solar heat absorption tower in terms of load-bearing and operation functions after the earthquake.

[0038] (4) High construction efficiency and quality controllability. The tower body of the heat absorption tower adopts an arc-shaped precast concrete tube segment and a precast concrete ring tower section to form an assembled structure, which is conducive to realizing the factory production of components and rapid on-site assembly, reducing on-site wet work and high-altitude continuous casting work, shortening the construction cycle, and improving the dimensional accuracy of components and the stability of construction quality.

[0039] (5) The joints have good sealing performance and durability. The vertical and horizontal joints are respectively equipped with high-temperature resistant elastic sealant, high-temperature resistant resin adhesive and tongue and groove connection structure, which can adapt to the temperature changes and local deformation of the structure in the operating environment of the solar heat absorption tower, and improve the sealing performance and durability of the tower joints.

[0040] (6) Inspection and maintenance are relatively convenient. The bottom energy-consuming annular tower section is equipped with a reserved installation slot for installing energy-consuming devices, which makes the installation relationship of energy-consuming devices and their end connection parts clear, and facilitates the inspection and maintenance of the sealing status of the joint, the connection status of the energy-consuming devices and the working status of the prestressed system, which is conducive to improving the performance of the structure throughout its entire life cycle.

[0041] In summary, this invention achieves controllable swaying under earthquake action, seismic energy dissipation, and post-earthquake self-resetting through the coordinated design of the prefabricated solar heat absorber tower body, sway interface, velocity-dependent energy dissipator, and post-tensioned vertical prestressing system. It also takes into account prefabricated construction, high-temperature sealing of joints, and structural durability, which is beneficial to improving the safety, seismic toughness, and post-earthquake functional recovery capability of solar heat absorbers under strong earthquake action. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall appearance of the prefabricated concrete self-resetting oscillating solar heat absorption tower structure system of the present invention.

[0043] Figure 2 This is a longitudinal cross-sectional schematic diagram showing the arrangement relationship between the foundation, the bottom energy-dissipating annular tower section, the energy-dissipating device, the precast concrete annular tower section, the vertical unbonded prestressed tendons, the swaying interface, and the concrete tower top anchorage zone in an embodiment of the present invention.

[0044] Figure 3 This is a planar schematic diagram showing the annular outline of the foundation and the heat absorption tower body, as well as the circumferential arrangement of the vertical unbonded prestressed tendons in an embodiment of the present invention.

[0045] Figure 4 This is a partial structural diagram illustrating the arrangement relationship between the bottom energy-consuming annular tower section, the energy-consuming device, the foundation, and the swaying interface in an embodiment of the present invention.

[0046] Figure 5 This is a schematic diagram of the reserved installation slot for the bottom energy-consuming annular tower section in an embodiment of the present invention.

[0047] Figure 6 This is an exploded schematic diagram showing the arrangement relationship between the bottom energy-dissipating annular tower section, the viscous damper, and the damper end connection structure in an embodiment of the present invention.

[0048] Figure 7 This is a partial structural diagram of an embodiment of the present invention, showing how adjacent arc-shaped precast concrete segments are connected by arc-shaped bolts to form a vertical joint.

[0049] Figure 8 This is a partial structural diagram of adjacent precast concrete annular tower segments being vertically assembled to form a horizontal joint in an embodiment of the present invention.

[0050] Figure 9 for Figure 8 A magnified cross-sectional view of the connection between adjacent precast concrete annular tower sections.

[0051] Figure 10 This is a schematic diagram of the vibration control principle of the prefabricated concrete self-resetting swaying solar heat absorption tower structure system of the present invention, showing the initial state before an earthquake, the swaying energy dissipation state under earthquake action, and the self-resetting state after an earthquake.

[0052] Explanation of markings in the diagram: 1: Bottom energy-dissipating annular tower section; 2: Vertical joint; 3: Precast concrete annular tower section; 4: Energy-dissipating device; 5: Vertical unbonded prestressed tendons; 6: Foundation; 7: Swaying interface; 8: Concrete tower top anchorage zone; 9: Arc bolt; 10: Arc precast concrete segment; 11: Viscous damper; 12: Damper end connection structure; 13: Horizontal joint; 14: Heat-absorbing tower body. Detailed Implementation

[0053] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0054] In the description of this invention, the terms “center,” “longitudinal,” “lateral,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only to facilitate the description of this invention and to simplify the expression, and do not indicate or imply that the relevant device or component must have a specific orientation, or be constructed or operated in a specific orientation.

[0055] Unless otherwise expressly specified and limited, the terms "connection," "setup," "installation," and "anchoring" used in this invention should be interpreted broadly. For example, "connection" can mean a direct connection or an indirect connection through an intermediate component, or a fixed connection, a detachable connection, or a hinged connection. Those skilled in the art can understand the specific meaning of the above terms based on the specific structure and stress relationship of the relevant components in this invention.

[0056] In this invention, the tower body refers to the entire upper structure located above the swaying interface 7 and swaying relative to the foundation 6 under seismic action. The tower body includes the heat-absorbing tower body 14, a concrete tower top anchoring zone 8 set at the top of the heat-absorbing tower body 14, and an upper structure fixedly connected to the heat-absorbing tower body 14 and moving together with it. The upper structure includes the tower top steel structure and tower top auxiliary structures, etc.

[0057] like Figure 1 and Figure 2 As shown, this embodiment provides a prefabricated concrete self-resetting swaying solar heat-absorbing tower structure system, including a foundation 6, a heat-absorbing tower body 14, an energy-consuming device 4, and a prestressing system.

[0058] The heat absorption tower body 14 includes a bottom energy-consuming annular tower section 1 at the bottom and multiple precast concrete annular tower sections 3 above the bottom energy-consuming annular tower section 1. Both the bottom energy-consuming annular tower section 1 and the multiple precast concrete annular tower sections 3 are annular and are assembled sequentially from bottom to top along the same vertical central axis to form a cylindrical heat absorption tower body 14.

[0059] The bottom energy-consuming annular tower section 1 is an annular concrete component located at the lowest part of the heat absorption tower body 14. Its outer wall is circumferentially spaced with multiple pre-reserved mounting slots (such as...) for accommodating and installing energy-consuming devices 4. Figure 5 (As shown). A swaying interface 7 is formed between the bottom surface of the bottom energy-dissipating annular tower section 1 and the top surface of the foundation 6.

[0060] Foundation 6 can be made of reinforced concrete, and its planar dimensions, thickness, and embedment depth are determined based on the tower load, foundation conditions, and sway response under seismic loading. The heat-absorbing tower body 14 and foundation 6 are arranged along the same vertical central axis.

[0061] The swaying interface 7 is used to enable the tower to sway in a controlled rotational manner relative to the foundation 6 under seismic loading. During the swaying process, the swaying interface 7 alternately opens, closes, and is subjected to compressive contact, so that the structural deformation is mainly concentrated near the predetermined swaying interface 7.

[0062] Except for the connection structure required for the normal operation of the vertical unbonded prestressed tendons 5 and the energy dissipation device 4, no through ordinary longitudinal steel bars or bonded connection structure are provided at the sway interface 7 to rigidly connect the bottom energy dissipation annular tower section 1 to the foundation 6, so as to ensure that the tower body can sway in the predetermined manner.

[0063] A high-ductility material layer, preferably high-ductility concrete, can be installed in the contact area of ​​the swaying interface 7 to improve the deformation capacity and resistance to localized damage in the contact area. The foundation 6 can be configured with a corresponding radial bearing range according to the tower load and swaying response requirements to increase the effective bearing area of ​​the swaying interface 7 and reduce the risk of localized contact compressive stress and localized concrete crushing during swaying.

[0064] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, multiple pre-installed mounting slots are spaced circumferentially along the outer wall of the bottom energy-dissipating annular tower section 1. The bottom of the pre-installed mounting slots is flush with the upper surface of the foundation 6, meaning the pre-installed mounting slots extend all the way to the top surface of the foundation 6. The energy-dissipating device 4 is a speed-dependent energy-dissipating device, with multiple speed-dependent energy-dissipating devices arranged circumferentially along the bottom energy-dissipating annular tower section 1 and installed in the corresponding pre-installed mounting slots. The upper end of each speed-dependent energy-dissipating device is connected to the front and rear walls of the pre-installed mounting slot, and the lower end is connected vertically to the foundation 6.

[0065] When the tower sways or shifts relative to the foundation 6, the velocity-dependent energy dissipator generates damping force and dissipates the seismic input energy.

[0066] In this invention, a velocity-dependent energy dissipator refers to an energy-dissipating component whose output damping force is related to the relative motion velocity at its two ends and can dissipate input energy during relative motion. In this embodiment, a viscous damper 11 is preferably used as the velocity-dependent energy dissipator.

[0067] like Figure 6As shown, the upper and lower ends of the viscous damper 11 are connected to the bottom energy-dissipating annular tower section 1 and the foundation 6 respectively through the damper end connection structure 12. The damper end connection structure 12 includes an upper connection part and a lower connection part. The upper connection part is set on the side wall of the reserved mounting groove, and the upper end of the viscous damper 11 is hinged to the upper connection part by a pin, thereby connecting to the bottom energy-dissipating annular tower section 1; the lower connection part is set on the top surface of the foundation 6, and the lower end of the viscous damper 11 is hinged to the lower connection part by a pin, thereby connecting to the foundation 6.

[0068] The damper end connection structure 12 may include components such as a connecting plate, lug plate, pin, base plate and anchor, and its specific structure, size and material can be determined according to the specifications, installation space and design stress requirements of the viscous damper 11.

[0069] When an earthquake causes the tower to sway relative to the foundation 6, one side of the swaying interface 7 partially opens, while the other side is under pressure and contact, resulting in relative displacement between the bottom energy-dissipating annular tower section 1 and the foundation 6. The viscous damper 11 expands and contracts with this relative displacement, generating damping force, thereby dissipating the earthquake input energy, controlling the swaying amplitude and dynamic response of the tower, and reducing the risk of irreversible plastic damage to the main load-bearing parts of the heat-absorbing tower body 14.

[0070] like Figure 2 and Figure 3 As shown, the prestressed system includes multiple vertical unbonded prestressing tendons 5. These multiple vertical unbonded prestressing tendons 5 are arranged within the central space enclosed by the heat-absorbing tower body 14, and are spaced circumferentially near the inner ring boundary of the heat-absorbing tower body 14. The vertical unbonded prestressing tendons 5 are separate from the concrete tower wall of the heat-absorbing tower body 14 and do not penetrate inside the arc-shaped precast concrete segments 10.

[0071] The bottom of the vertical unbonded prestressed tendon 5 is anchored to the foundation 6, and the top is tensioned and anchored to the concrete tower top anchorage zone 8. The concrete tower top anchorage zone 8 is located at the top of the heat-absorbing tower body 14 and is constructed as an annular concrete cover plate for tensioning and anchoring the vertical unbonded prestressed tendon 5.

[0072] The vertical unbonded prestressing tendons 5 can be made of low-relaxation prestressed steel strands. Their material properties, quantity, cross-sectional specifications, initial prestress, and tension control stress are determined according to the tower height, structural mass, seismic action, and self-resetting performance requirements.

[0073] A high-temperature resistant protective sleeve can be installed on the outside of the vertical unbonded prestressing tendon 5 to reduce the adverse effects of high temperature environment, water vapor and corrosive media on the long-term working performance of the prestressing system.

[0074] During an earthquake, as the tower sways around the swaying interface 7, the vertical unbonded prestressed tendons 5 elastically elongate and store elastic strain energy as the tower rises and rotates. After the earthquake, the vertical unbonded prestressed tendons 5 release their stored elastic strain energy, and their elastic restoring force provides a restoring torque for the tower, driving it to return to its initial vertical position, thereby reducing post-earthquake residual tilt and residual deformation.

[0075] like Figure 1 , Figure 2 , Figure 5 , Figure 7 , Figure 8 and Figure 9 As shown, the heat absorption tower body 14 includes a bottom energy-consuming annular tower section 1 and multiple precast concrete annular tower sections 3 located above it.

[0076] Each precast concrete annular tower segment 3 is assembled from multiple arc-shaped precast concrete tube segments 10 along the circumference using arc-shaped bolts 9 to form a closed ring. Vertical joints 2 are formed between adjacent arc-shaped precast concrete tube segments 10, and high-temperature resistant elastic sealant is applied at the vertical joints 2 to improve the sealing performance between adjacent arc-shaped precast concrete tube segments 10 and to adapt to temperature changes and local structural deformation.

[0077] Horizontal joints 13 are formed between the bottom energy-consuming annular tower section 1 and the adjacent precast concrete annular tower section 3 above it, as well as between the adjacent precast concrete annular tower sections 3 above and below it.

[0078] The horizontal joint 13 forms a tongue-and-groove connection through the interlocking structure of the joint surfaces of adjacent tower sections. A high-temperature resistant resin adhesive is applied to the horizontal joint 13, and high-temperature resistant elastic sealant is applied to the inner and outer edges of the horizontal joint 13.

[0079] The interlocking structure is used to improve the installation positioning capability and joint stability between adjacent tower sections; the high-temperature resistant resin adhesive is used to improve the bonding performance and integrity between adjacent tower sections; the high-temperature resistant elastic sealant is used to improve the sealing performance of vertical joint 2 and horizontal joint 13, and to adapt to temperature changes and local structural deformation.

[0080] The material type and temperature resistance rating of high-temperature resistant elastic sealant and high-temperature resistant resin adhesive can be determined according to the actual operating temperature, environmental conditions and medium type of the solar heat absorption tower.

[0081] The aforementioned sealing structure can reduce the risk of rainwater, dust, high-temperature airflow, and corrosive media entering the interior of the heat absorber tower body 14 along the joints. When abnormal leakage, splashing, or maintenance discharge occurs in the heat absorber at the top of the tower or in the high-temperature medium pipeline, it can also reduce the risk of high-temperature heat transfer media such as molten salt entering the interior of the heat absorber tower body 14 along the vertical joint 2 and the horizontal joint 13.

[0082] During the assembly of the heat absorption tower body 14, measuring equipment such as laser plumb bobs can be used to control the axial position and verticality of the tower body. After each precast concrete annular tower section 3 is installed, the center position, elevation and verticality of the tower section can be checked, and adjustments can be made according to the check results to ensure the overall assembly accuracy of the heat absorption tower body 14.

[0083] The construction of this system mainly includes the following steps: (1) Factory prefabrication The bottom energy-dissipating annular tower section 1, the arc-shaped precast concrete tube segment 10, and the related components of the concrete tower top anchorage zone 8 are prefabricated in the factory. Multiple pre-reserved installation slots are spaced circumferentially at the bottom of the bottom energy-dissipating annular tower section 1, and installation positions for the damper end connection structure 12 are reserved according to the installation requirements of the viscous damper 11. Installation holes for arc-shaped bolts 9 are reserved in the arc-shaped precast concrete tube segment 10, and interlocking concave-convex structures are prefabricated on the end face used to form the horizontal joint 13.

[0084] After prefabrication, the dimensional accuracy, joint mating surfaces, reserved installation grooves, and reserved installation positions of each prefabricated component are checked.

[0085] (2) Foundation construction The foundation 6 is constructed on site, and an anchoring structure for anchoring the bottom of the vertical unbonded prestressed tendons 5 is pre-embedded or reserved in the foundation 6. According to the arrangement position of the viscous damper 11, the lower connection part of the damper end connection structure 12 is pre-embedded or reserved on the top surface of the foundation 6 so that the lower end of the viscous damper 11 can be connected to the foundation 6.

[0086] After the foundation 6 is completed, the elevation, flatness, tower centerline, prestressed tendon anchorage position, and damper connection position of the foundation top surface are checked to provide a positioning foundation for the subsequent formation of the sway interface 7, installation of the bottom energy-dissipating annular tower section 1 and energy-dissipating device 4.

[0087] (3) Treatment of the swing interface and installation of the bottom energy-consuming annular tower section According to design requirements, the swaying contact area on the top surface of foundation 6 is treated, and a high-ductility material layer, preferably a high-ductility concrete layer, can be installed in the contact area. Then, the bottom energy-dissipating annular tower section 1 is hoisted and positioned so that it and foundation 6 are arranged along the same vertical central axis. After the bottom energy-dissipating annular tower section 1 is installed in place, a swaying interface 7 is formed between its bottom surface and the top surface of foundation 6.

[0088] During installation, the center position, elevation, levelness, and correspondence between the reserved installation slot and the damper connection position on the top surface of the foundation 6 should be verified.

[0089] (4) Installation of energy-consuming devices Multiple velocity-dependent energy dissipators are installed in the reserved mounting slots corresponding to the bottom energy-dissipating annular tower section 1, and are arranged at intervals along the circumference of the bottom energy-dissipating annular tower section 1. In this embodiment, the velocity-dependent energy dissipator is preferably a viscous damper 11. The upper end of the viscous damper 11 is connected to the bottom energy-dissipating annular tower section 1 through the upper connecting part of the damper end connecting structure 12, and the lower end is connected to the foundation 6 through the lower connecting part of the damper end connecting structure 12, so that the viscous damper 11 spans between the bottom energy-dissipating annular tower section 1 and the foundation 6.

[0090] After installation, the installation direction, initial position, working stroke, and connection status of the damper end connection structure 12 of the viscous damper 11 should be checked to ensure that the viscous damper 11 can expand and contract normally with the movement of the tower body relative to the foundation 6.

[0091] (5) Assembly of the heat absorption tower body Multiple arc-shaped precast concrete segments 10 are assembled circumferentially using arc-shaped bolts 9 to form a closed precast concrete annular tower segment 3. Vertical joints 2 are formed between adjacent arc-shaped precast concrete segments 10, and high-temperature resistant elastic sealant is applied to the vertical joints 2. The precast concrete annular tower segment 3 is hoisted section by section from bottom to top above the bottom energy-dissipating annular tower segment 1. Horizontal joints 13 are formed between the bottom energy-dissipating annular tower segment 1 and its adjacent precast concrete annular tower segment 3 above it, as well as between adjacent precast concrete annular tower segments 3 above and below it. The horizontal joints 13 form a tongue-and-groove connection through the interlocking structure of the end faces of adjacent tower segments, and high-temperature resistant resin adhesive is applied to the horizontal joints 13. High-temperature resistant elastic sealant is applied to the inner and outer edges of the horizontal joints 13.

[0092] After each precast concrete annular tower segment 3 is installed, the center position, elevation, and verticality of the tower segment should be checked, and adjustments should be made according to the check results until the vertical assembly of the heat absorption tower body 14 is completed.

[0093] (6) Installation of anchorage zone at the top of concrete tower and arrangement and tensioning of prestressed tendons After the heat absorber tower body 14 is assembled, a concrete tower top anchorage zone 8 is installed on its top. Multiple vertical unbonded prestressed tendons 5 are arranged within the central space enclosed by the heat absorber tower body 14. These tendons 5 are spaced circumferentially near the inner ring boundary of the heat absorber tower body 14, with their bottoms anchored to the foundation 6 and their tops extending to the concrete tower top anchorage zone 8. High-temperature resistant protective sleeves can be installed on the outside of the vertical unbonded prestressed tendons 5. After the overall axial position and verticality of the heat absorber tower body 14 are verified as acceptable, the multiple vertical unbonded prestressed tendons 5 are symmetrically and gradedly tensioned at the concrete tower top anchorage zone 8 and anchored to the design control state, forming a post-tensioned vertical prestressed self-resetting system.

[0094] (7) Sealing, protection and final verification Final sealing inspection and necessary supplementary treatment are carried out on the vertical joints 2 between the arc-shaped precast concrete segments 10, the horizontal joints 13 between the bottom energy-consuming annular tower segment 1 and the adjacent precast concrete annular tower segment 3, and the horizontal joints 13 between the upper and lower adjacent precast concrete annular tower segments 3.

[0095] Check the circumferential arrangement of the energy dissipation device 4, the working stroke of the viscous damper 11, and the connection status between the damper end connection structure 12 and the bottom energy dissipation annular tower section 1 and foundation 6.

[0096] Simultaneously, the tensioning and anchoring status of the vertical unbonded prestressed tendons 5, the overall verticality of the heat absorption tower body 14, the contact status of the swaying interface 7, and the installation accuracy of each precast component were checked. After the inspection confirmed that the structure met the design requirements, the construction of the structural system was completed.

[0097] Figure 10 The vibration reduction and control principle of the structural system of the present invention is shown, including the initial state before an earthquake, the swaying and energy dissipation state under earthquake action, and the self-resetting state after an earthquake.

[0098] Before the earthquake, the tower body remained in its initial vertical state, the sway interface 7 was in a closed contact state, the viscous damper 11 was in its initial working position, and the vertical unbonded prestressing tendon 5 remained in a pre-tensioned state.

[0099] Under seismic action, the tower body undergoes controlled rotational swaying around the swaying interface 7 under horizontal inertia. One side of the swaying interface 7 partially opens, while the other side remains under compressive contact. Except for the connection structures required for the normal operation of the vertical unbonded prestressed tendons 5 and the energy dissipation device 4, no through-type ordinary longitudinal steel bars or bonded connection structures are provided at the swaying interface 7 to rigidly connect the bottom energy dissipation annular tower section 1 to the foundation 6. This allows the tower body to sway in a predetermined manner and reduces the energy dissipation requirement of the main load-bearing parts of the heat absorption tower body 14 through plastic deformation.

[0100] During the tower's swaying process, relative motion occurs between the bottom energy-dissipating annular tower section 1 and the foundation 6. The viscous damper 11, which is connected between the two, expands and contracts accordingly, generating damping force, thereby dissipating the seismic input energy, controlling the tower's swaying amplitude and dynamic response, and reducing the risk of serious damage to the main load-bearing parts of the heat-absorbing tower body 14 and the swaying interface 7.

[0101] Meanwhile, the vertical unbonded prestressing tendons 5 undergo elastic elongation as the tower is lifted and rotates, storing elastic strain energy. After the earthquake ends, the vertical unbonded prestressing tendons 5 release their stored elastic strain energy, and their elastic restoring force provides a restoring torque for the tower, driving the tower to return to its initial vertical position, thereby reducing the residual tilt and residual deformation of the structure after the earthquake.

[0102] The vertical joints 2 between adjacent arc-shaped precast concrete segments 10, and the horizontal joints 13 between the bottom energy-consuming annular tower segment 1 and the precast concrete annular tower segment 3, as well as between adjacent upper and lower precast concrete annular tower segments 3, are all equipped with high-temperature resistant sealing structures. These high-temperature resistant sealing structures can adapt to temperature changes and local structural deformation, improving the sealing performance and durability of the joints at the heat absorption tower body 14.

[0103] The collaborative working mechanism of this technology is as follows: The collaborative working mechanism of the structural system of this invention is mainly reflected in five aspects: controllable swaying, energy dissipation and vibration reduction, prestressed self-resetting, prefabricated construction, and high-temperature sealing protection.

[0104] like Figure 10 As shown, the working state of the structural system of the present invention during the entire process of earthquake action can be divided into three stages: the initial vertical state before the earthquake, the swaying and energy dissipation state under earthquake action, and the self-resetting state after the earthquake.

[0105] Stage (a) represents the initial vertical state before the earthquake. At this time, the tower body maintains its initial vertical state, the bottom energy-dissipating annular tower section 1 is supported on the foundation 6, the sway interface 7 is in a closed contact state, and no relative movement caused by the earthquake occurs between the bottom energy-dissipating annular tower section 1 and the foundation 6. The viscous damper 11 is in its initial working position, the vertical unbonded prestressing tendons 5 are in a pre-tensioned state, and the structural system maintains a stable load-bearing state.

[0106] Stage (b) is the swaying energy dissipation state under seismic loading. Under horizontal seismic loading, the tower body undergoes a controllable rotational swaying relative to the foundation 6 around the swaying interface 7 under inertial action. One side of the swaying interface 7 partially opens, while the other side remains in compressive contact, so that the structural deformation is mainly concentrated near the predetermined bottom swaying interface, reducing the risk of irreversible plastic damage to the main load-bearing parts of the heat absorption tower body 14.

[0107] Except for the connection structure required for the normal operation of the vertical unbonded prestressed tendons 5 and the energy dissipation device 4, no through ordinary longitudinal steel bars or bonded connection structure are provided at the sway interface 7 to rigidly connect the bottom energy dissipation annular tower section 1 to the foundation 6, so that the tower body can sway in a predetermined manner and reduce the need for the heat absorption tower body 14 to dissipate seismic energy through the plastic deformation of the main concrete components.

[0108] During the tower's swaying process, relative motion occurs between the bottom energy-dissipating annular tower section 1 and the foundation 6. Multiple velocity-dependent energy dissipators in the energy dissipation device 4 expand and contract with this relative motion, generating damping force. In this embodiment, the velocity-dependent energy dissipators are preferably viscous dampers 11. The viscous damper 11 dissipates seismic input energy, controls the tower's swaying amplitude and dynamic response, and reduces the risk of severe damage to the heat absorption tower body 14 and the swaying interface 7.

[0109] Meanwhile, the lifting and rotation of the tower cause the vertical unbonded prestressed tendons 5 to undergo additional elastic elongation and store elastic strain energy. The elastic restoring force generated by the vertical unbonded prestressed tendons 5 forms a restoring moment on the tower and restricts the swaying deformation of the tower.

[0110] Stage (c) represents the post-earthquake self-resetting state. As the earthquake weakens or ends, the viscous damper 11 gradually ceases its energy-dissipating function, and the vertical unbonded prestressing tendons 5 release the elastic strain energy stored during the tower's swaying. Under the combined action of the tower's weight and the elastic restoring force of the vertical unbonded prestressing tendons 5, the tower acquires a restoring moment pointing towards its initial equilibrium position and recovers to its initial vertical position, thereby reducing the residual tilt and deformation of the structure after the earthquake and improving its post-earthquake load-bearing capacity and recovery ability.

[0111] In the above process, the sway interface 7 is used to concentrate the main structural deformation at a predetermined location; the energy dissipation device 4 is used to dissipate the seismic input energy and control the tower's sway response; and the vertical unbonded prestressed tendons 5 are used to provide restoring moment and reduce post-earthquake residual deformation. Together, these three components form a synergistic seismic resistance mechanism of "sway reduction - damping energy dissipation - prestressed resetting".

[0112] In terms of prefabricated construction, the heat-absorbing tower body 14 includes a bottom energy-consuming annular tower section 1 and multiple precast concrete annular tower sections 3. Each precast concrete annular tower section 3 is formed by assembling multiple arc-shaped precast concrete tube segments 10 along the circumference. This structure enables the factory prefabrication and on-site assembly of the main concrete components, reduces on-site wet work and high-altitude casting work, improves the manufacturing precision of components and the controllability of construction quality, and shortens the on-site construction cycle.

[0113] In terms of high-temperature sealing protection, high-temperature resistant elastic sealant is applied to the vertical joint 2 formed between adjacent arc-shaped precast concrete pipe segments 10; high-temperature resistant resin adhesive is applied to the horizontal joint 13 formed between the bottom energy-consuming annular tower segment 1 and the adjacent precast concrete annular tower segment 3 above it, as well as between the adjacent precast concrete annular tower segments 3 above and below it, and high-temperature resistant elastic sealant is applied to the inner and outer edges of the horizontal joint 13 respectively.

[0114] The aforementioned joint structure can adapt to temperature changes and local structural deformations during the operation of the solar absorber tower, improving the sealing performance, high-temperature resistance, and durability of the joints, and reducing the risk of rainwater, dust, high-temperature airflow, and corrosive media entering the tower body 14 along the joints. When abnormal leaks, splashes, or maintenance discharges occur in the absorber at the top of the tower or in the high-temperature medium pipeline, the joint structure can also reduce the risk of high-temperature heat transfer media such as molten salt entering the tower body 14 along the vertical joints 2 and horizontal joints 13.

[0115] Thus, the present invention achieves a comprehensive improvement in structural seismic damage control, seismic energy dissipation, post-earthquake self-resetting, prefabricated construction, and high-temperature sealing durability through the synergistic effect of the swing interface 7, energy dissipation device 4, vertical unbonded prestressed tendons 5, prefabricated heat absorption tower body 14, and high-temperature resistant joint structure.

[0116] Figure 1 The top heat absorber and its supporting structure above the tower body 14 of the heat absorber tower shown are used to illustrate the application scenario of the structural system of the present invention. Its specific structural form can adopt existing structures in the field, and the present invention does not specifically limit it. When the top heat absorber and its supporting structure are fixedly connected to the tower body 14 of the heat absorber tower, they move together with the tower body 14 of the heat absorber tower.

[0117] The above description is merely a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any equivalent substitutions, simple modifications, or improvements made by those skilled in the art to the technical solutions of the present invention without departing from the inventive concept shall be subject to the scope of protection defined in the claims of the present invention.

Claims

1. A prefabricated concrete self-resetting oscillating solar heat absorption tower structural system, characterized in that: The structural system includes a foundation (6), a heat absorption tower body (14), an energy-consuming device (4), and a prestressing system; The heat absorption tower body (14) includes a bottom energy-consuming annular tower section (1) located at the bottommost part and multiple precast concrete annular tower sections (3) located above the bottom energy-consuming annular tower section (1). The bottom energy-consuming annular tower section (1) and the multiple precast concrete annular tower sections (3) are assembled and fixed sequentially from bottom to top along the same vertical central axis. A swaying interface (7) is formed between the bottom surface of the bottom energy-consuming annular tower section (1) and the top surface of the foundation (6). The tower body is an upper structure located above the swing interface (7) and capable of swinging relative to the foundation (6) as a whole; the tower body includes the heat absorption tower body (14), a concrete tower top anchoring area (8) set on the top of the heat absorption tower body (14), and an upper structure fixedly connected to the heat absorption tower body (14) and moving together with it. The outer wall of the bottom energy-consuming annular tower section (1) is provided with a plurality of recessed pre-installed slots at intervals along the circumference; the energy-consuming device (4) includes a plurality of speed-related energy-consuming devices, which are arranged at intervals along the circumference of the bottom energy-consuming annular tower section (1) and respectively installed in the corresponding pre-installed slots; each speed-related energy-consuming device is arranged across the swaying interface (7), with its upper end connected to the bottom energy-consuming annular tower section (1) and its lower end connected to the foundation (6) to generate energy-consuming effect when the tower body sways relative to the foundation (6); The prestressing system includes multiple vertical unbonded prestressing tendons (5), which are arranged in the middle space enclosed by the heat absorption tower body (14) and spaced apart circumferentially along the heat absorption tower body (14); the bottom of the vertical unbonded prestressing tendons (5) is anchored to the foundation (6), and the top is tensioned and anchored to the concrete tower top anchorage area (8) to provide restoring force to the tower body after it sways; The concrete tower top anchorage zone (8) is a concrete cover ring set on the top of the heat absorption tower body (14) for tensioning and anchoring the vertical unbonded prestressed tendons (5).

2. The prefabricated concrete self-resetting oscillating solar heat absorption tower structural system according to claim 1, characterized in that: Each of the precast concrete annular tower segments (3) is a closed ring formed by assembling multiple arc-shaped precast concrete segments (10) along the circumferential direction using arc bolts (9); A vertical joint (2) is formed between adjacent arc-shaped precast concrete segments (10), and a high-temperature resistant elastic sealant is provided at the vertical joint (2); The precast concrete annular tower segments (3) that are adjacent to each other, and the precast concrete annular tower segment (3) at the bottom and the precast concrete annular tower segment (3) above them are connected by tongue and groove joints formed by the interlocking structure of the contact surfaces of the adjacent tower segments, and a horizontal joint (13) is formed at the tongue and groove joint. A high-temperature resistant resin adhesive is provided at the horizontal joint (13), and a high-temperature resistant elastic sealant is provided on the inner and outer edges of the horizontal joint (13).

3. The prefabricated concrete self-resetting oscillating solar heat absorption tower structural system according to claim 1, characterized in that: A high-ductility material layer is provided on the swing interface (7).

4. The prefabricated concrete self-resetting oscillating solar heat absorption tower structural system according to claim 3, characterized in that: The high-ductility material layer is formed of high-ductility concrete.

5. The prefabricated concrete self-resetting oscillating solar heat absorption tower structural system according to claim 1, characterized in that: The reserved installation groove is recessed inward along the outer side wall of the bottom energy-consuming annular tower section (1) and extends downward to the bottom surface of the bottom energy-consuming annular tower section (1); multiple speed-related energy consumers are respectively installed in the corresponding reserved installation grooves, with the upper end of each speed-related energy consumer connected to the bottom energy-consuming annular tower section (1) and the lower end connected to the top surface of the foundation (6).

6. The prefabricated concrete self-resetting oscillating solar heat absorption tower structural system according to claim 5, characterized in that: The velocity-dependent energy dissipator is a viscous damper (11); the damper end connection structure (12) includes an upper connection part and a lower connection part, the upper connection part is disposed on the side wall of the reserved installation groove, and the lower connection part is disposed on the top surface of the foundation (6).

7. The prefabricated concrete self-resetting oscillating solar heat absorption tower structural system according to claim 1, characterized in that: The vertical unbonded prestressed tendon (5) is provided with a high-temperature resistant protective sleeve.

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