Fabricated building reinforcing structure

Abstract

The invention belongs to the technical field of building construction, and particularly relates to a fabricated building cantilever balcony reinforcing structure which comprises a reinforcing base frame, an outer reinforcing assembly, an inner reinforcing assembly and a series connection rod, and the reinforcing base frame is composed of an upper clamping device, a lower clamping device and a vertical reinforcing column, clamps an upper beam and a lower beam of a building body respectively and is buried in an outer wall; the outer reinforcing assembly comprises longitudinal rods, outer transverse rods, diagonal draw bars and inner transverse rods, the outer transverse rods are arranged on the lower edge of the outer side of the balcony, the longitudinal rods are embedded in the bottom face of the balcony, and the diagonal draw bars are connected with the outer transverse rods and the vertical reinforcing columns; the inner reinforcing assembly comprises an inner pull rod and an anchor rod, the anchor rod is fixed to the balcony floor, and the inner pull rod is connected with the anchor rod and the vertical reinforcing column or the indoor ground. The series connection rods vertically communicate with the outer reinforcing assemblies. The reinforcing structure disclosed by the invention can be completely hidden; all the components form an integrated stress system, the anti-overturning capacity of the cantilever balcony is greatly improved, loads are effectively transmitted to a main body cross beam, the stress of an outer wall is reduced, installation is rapid, the period is short, and rapid construction of a fabricated building is adapted.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and specifically relates to a prefabricated building reinforcement structure. Background Technology

[0002] Prefabricated construction is an important development direction for the transformation and upgrading of the modern construction industry. Cantilevered balconies in prefabricated buildings are often formed by connecting precast concrete balcony slabs to the main building beams, columns, and wall panels. Their structural stiffness, load-bearing safety, and long-term service performance directly affect the overall safety of the building. Under self-weight, live loads, wind loads, and seismic forces, cantilevered balconies experience significant bending moments and shear forces at the base of the cantilever, potentially leading to concrete cracking, continuous crack propagation, and increasing deflection. Traditional structural forms rely heavily on the strength of the joints themselves, lacking external reinforcement and stress control methods. Cracks are difficult to heal themselves, severely impacting structural durability and the sense of security for residents.

[0003] Conventional steel supports, tie rods, brackets, and other reinforcement components are mostly exposed on the building facade or at the bottom of balconies. This not only affects the uniformity and aesthetics of the building's appearance but also exposes it to harsh environments such as sunlight, rain, and temperature differences for extended periods, making it prone to corrosion, aging, loosening, and detachment. This results in high maintenance costs and significant disruption to residents' daily lives during maintenance. On the other hand, on-site formwork and recasting methods involve complex construction procedures, long cycles, and significant noise and dust pollution, making them unsuitable for simultaneous reinforcement of existing buildings during renovation or new construction.

[0004] In order to address the shortcomings of current prefabricated cantilever balcony reinforcement technology, such as significant aesthetic damage and low construction efficiency, it is necessary to design a reinforcement structure suitable for prefabricated buildings. Summary of the Invention

[0005] To address the aforementioned problems in existing technologies, this solution provides a prefabricated building reinforcement structure.

[0006] The technical solution adopted in this invention is as follows: A prefabricated building reinforcement structure for reinforcing cantilevered balconies on the main structure of a building, comprising: The reinforcing frame includes an upper clamp, a lower clamp, and a vertical reinforcing column; the upper clamp is clamped to the upper crossbeam of the main building; the lower clamp is clamped to the lower crossbeam of the main building; the vertical reinforcing column is connected between the upper clamp and the lower clamp and is embedded in the outer wall of the main building. The external reinforcement assembly includes longitudinal bars, outer horizontal bars, diagonal braces, and inner horizontal bars; the outer horizontal bars are installed at the lower edge of the outer side of the cantilevered balcony, and the inner horizontal bars are fixed to the outer side of the exterior wall; multiple longitudinal bars are connected between the outer and inner horizontal bars, and the longitudinal bars are embedded in the lower bottom surface of the cantilevered balcony; both ends of the outer horizontal bars are connected to diagonal braces, and the other ends of the two diagonal braces pass through the exterior wall and are connected to different vertical reinforcing columns; The internal reinforcement component includes an internal tie rod and an anchor rod; the anchor rod is fixed inside the balcony floor of the cantilevered balcony; one end of the internal tie rod is connected to the anchor rod, and the other end is connected to the vertical reinforcing column or the indoor ground of the building structure. The connecting rod is installed in the balcony floor of the cantilevered balcony. The lower end of the connecting rod is connected to the external reinforcement component, and the upper end is connected to the external reinforcement component.

[0007] Optionally: The upper clamping device includes an inner clamping plate, an outer clamping plate, and a through bolt; the inner clamping plate is Z-shaped, with its upper end abutting against the inner facade of the upper crossbeam and its lower end abutting against the inner facade of the outer wall; the upper end of the outer clamping plate abutting against the outer facade of the upper crossbeam and its lower end abutting against the outer facade of the outer wall; the through bolt passes through the outer wall and connects the inner and outer clamping plates for tightening.

[0008] Optional: The lower clamp has the same structure as the upper clamp.

[0009] Optionally: The vertical reinforcing column is made of channel steel, and its groove faces the outer wall; stress tie seats are fixed at the upper and lower ends of the groove of the vertical reinforcing column, and a stress tie rod is connected between the two stress tie seats; in use, the stress tie rod is in a taut state so that the middle of the vertical reinforcing column generates prestress facing the interior.

[0010] Optionally: A connecting piece is provided at the connection between the vertical reinforcing column and the upper clamping device and the lower clamping device. One end of the connecting piece extends into the groove of the vertical reinforcing column and is fixed by bolts, and the other end extends to the outside of the inner clamping plate and is fixedly connected to the inner clamping plate by bolts.

[0011] Optionally: the tie rod is embedded in the side railing of the cantilevered balcony; the portion of the tie rod located outside the exterior wall is always lower than the upper edge of the side railing.

[0012] Optionally: A prestressed strip is provided above the longitudinal bar, both ends of the prestressed strip are fixed to the longitudinal bar, and the middle of the prestressed strip has an upward arching stress.

[0013] Optional: The lower part of the tandem rod is provided with two radial protrusions facing opposite directions, the distal end of the radial protrusions having a flat portion. The thickness of the two radial protrusions corresponds to the same thickness of the prestressing bar and the longitudinal bar. The two radial protrusions can extend into the rectangular holes on the prestressing bar and the longitudinal bar, respectively. When the tandem rod rotates, it applies forces in opposite directions to the prestressing bar and the longitudinal bar through the two radial protrusions, respectively.

[0014] Optionally, the upper and lower ends of the connecting rod are both threaded to facilitate the connection of nuts and to fix the longitudinal rod to the inner tie rod.

[0015] Optionally: When the other end of the inner tie rod is connected to the vertical reinforcing column, a horizontal seat rod is connected between the lower ends of the two vertical reinforcing columns, and the inner tie rod and the horizontal seat rod are fixedly connected by bolts; When the other end of the inner tie rod is connected to the indoor floor of the building structure, an inner space frame is embedded under the floor of the building structure and fixed by expansion bolts; the inner tie rod and the inner space frame are fixedly connected by bolts.

[0016] The beneficial effects of this invention are as follows: 1. The reinforcement structure in this invention is similar to the structure of the cantilever balcony itself. The reinforcing frame, external reinforcement components, internal reinforcement components, and connecting rods can all be arranged in a fully concealed manner. After reinforcement, there are no exposed steel sections or supporting structures, maintaining a clean and beautiful facade without affecting the building's appearance or functionality. At the same time, these structures form a complete support system, making the balcony floor, side railings, exterior walls, and main building beams an integrated load-bearing structure, significantly improving the overturning resistance of the cantilever balcony. 2. In this invention, no large amount of wet work is required during on-site construction. The installation is convenient and the construction period is short, which is highly consistent with the concept of rapid construction of prefabricated buildings. It is suitable for reinforcement of new balconies and reinforcement and renovation of existing buildings. The reinforcement structure is fixed with bolts at different locations, which not only facilitates the recycling of the structure, but also improves the flexibility and efficiency of assembly and reduces damage to the prefabricated building itself. 3. The reinforcement of this invention can effectively transfer the load of the cantilever balcony to the beam with a higher load-bearing threshold, reduce the stress on the exterior wall itself, and improve the structural strength and reinforcement stability; at the same time, the reinforced base frame can also provide support between the upper and lower beams, and strengthen the load on the beam. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this scheme or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a structural schematic diagram of the prefabricated building reinforcement structure in this plan; Figure 2 It is a structural diagram of a prefabricated building that utilizes reinforced structures; Figure 3 This is a schematic diagram of another type of reinforced structure; Figure 4 This is a diagram showing the installation status of the upper clamp; Figure 5This is a structural schematic diagram of the column; Figure 6 This is a diagram showing the installation status of the prestressed strips; Figure 7 This is a schematic diagram of the cascading rod structure.

[0019] In the diagram: 1-Main building structure; 11-Upper beam; 12-Exterior wall; 13-Lower beam; 2-Cantilever balcony; 21-Side railing; 22-Exterior railing; 23-Balcony floor; 3-External reinforcement components; 31-Diagonal tie rod; 32-External horizontal bar; 33-Longitudinal bar; 34-Inner horizontal bar; 4-Reinforcing frame; 41-Upper clamp; 411-Inner clamping plate; 412-External clamping plate; 413-Through bolt; 42-Vertical reinforcing column; 421-Stress tension seat; 422-Stress tension rod; 43-Lower clamp; 44-Connecting piece; 5-Internal reinforcement components; 51-Embedded space frame; 52-Internal tie rod; 53-Anchor rod; 54-Transverse seat rod; 6-Series rod; 61-Planar part; 62-Radial protrusion; 7-Prestressed strip. Detailed Implementation

[0020] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this solution without creative effort are within the protection scope of this solution.

[0021] Example like Figures 1 to 7 As shown in the figure, this embodiment designs a prefabricated building reinforcement structure for reinforcing the cantilevered balcony 2 on the main building 1. It includes a reinforcing frame 4, an external reinforcement component 3, an internal reinforcement component 5, and a connecting rod 6. The multi-component collaborative design not only improves the redundancy of the reinforcement structure and reduces the safety risks caused by the failure of a single component, but also adapts to prefabricated cantilevered balconies 2 of different specifications and working conditions. Whether for the synchronous reinforcement of new buildings or the reinforcement and renovation of existing buildings, it has good versatility and adaptability.

[0022] The reinforcing frame 4 includes an upper clamp 41, a lower clamp 43, and a vertical reinforcing column 42. The upper clamp 41 clamps onto the upper beam 11 of the main building 1; the lower clamp 43 clamps onto the lower beam 13 of the main building 1; the vertical reinforcing column 42 connects the upper clamp 41 and the lower clamp 43 and is embedded in the outer wall 12 of the main building 1. The vertical reinforcing column 42 forms a vertically continuous load-bearing column, which not only transmits the load-bearing capacity of the upper beam 11 downwards but also provides stable support for the external reinforcing components 3 and the internal reinforcing components 5, ensuring that each reinforcing component can work together to bear the load and transmit the force efficiently. The vertical reinforcing column 42 is embedded inside the outer wall 12 of the main building 1, realizing the concealed arrangement of the reinforcing components and avoiding the problems of corrosion and aging caused by exposure to sunlight and rain. Anchoring is achieved by clamping without damaging the original structure of the main beam of the building. The construction is convenient and causes little damage to the main structure. It can be applied to different reinforcement scenarios while ensuring the reinforcement effect.

[0023] The upper clamping device 41 includes an inner clamping plate 411, an outer clamping plate 412, and a through bolt 413. The inner clamping plate 411 is Z-shaped, with its upper end abutting against the inner surface of the upper beam 11 and its lower end abutting against the inner surface of the outer wall 12. The upper end of the outer clamping plate 412 abuts against the outer surface of the upper beam 11 and its lower end abuts against the outer surface of the outer wall 12. The through bolt 413 passes through the outer wall 12 and connects the inner clamping plate 411 and the outer clamping plate 412 for tightening. The lower clamping device 43 has the same structure as the upper clamping device 41. The special shape of the Z-shaped inner clamping plate 411 achieves a tight fit with the upper and lower beams 13 and the outer wall 12, avoiding damage to the main structure caused by local stress concentration. Combined with the outer clamping plate 412, it forms a two-way fit, allowing the tensile force, bending moment, and other loads borne by the reinforced structure to be efficiently transferred to the main beam, reducing the stress burden on the outer wall 12. Different specifications of through bolts 413 are selected to accommodate beams and exterior walls 12 of varying thicknesses. The clamping connection method eliminates the need for destructive construction such as drilling or grooving on the main beam, maximizing the protection of the structural integrity of the main beam, reducing the impact of construction on the main building 1, and facilitating adjustment or replacement.

[0024] The vertical reinforcing column 42 is made of channel steel, with its groove facing the exterior wall 12. Stress relief brackets 421 are fixed at the upper and lower ends of the groove in the vertical reinforcing column 42, and a stress relief rod 422 connects the two stress relief brackets 421. In use, the stress relief rod 422 is in a taut state, generating prestress in the middle of the vertical reinforcing column 42 towards the interior. The groove of the vertical reinforcing column 42 faces the exterior wall 12, facilitating the installation and fixing of components such as the stress relief brackets 421 and connecting pieces 44. Through the cooperation of the stress relief brackets 421 and the stress relief rod 422, the prestress generated in the middle of the vertical reinforcing column 42 after tautness actively counteracts the overturning moment generated by the outward extension of the cantilevered balcony 2, effectively suppressing cracking, outward tilting, and increased deflection at the balcony root, significantly improving the structure's overturning resistance and crack resistance. The prestress can be precisely controlled by adjusting the tension of the stress relief rod 422 to adapt to different load conditions and reduce the stress burden on the exterior wall 12.

[0025] Connecting pieces 44 are provided at the connection points between the vertical reinforcing column 42 and the upper clamping device 41 and the lower clamping device 43. One end of the connecting piece 44 extends into the groove of the vertical reinforcing column 42 and is fixed with bolts, while the other end extends to the outside of the inner clamping plate 411 and is fixedly connected to the inner clamping plate 411 with bolts. The bolted connection of the connecting piece 44 facilitates on-site installation, positioning, and adjustment, adapts to different installation errors, improves construction efficiency, and is easy to disassemble, facilitating later maintenance and repair. It increases the compatibility between the clamping device and the crossbeam, and between the vertical reinforcing column 42 and the outer wall 12, ensuring the force transmission effect of the entire reinforcement system.

[0026] The external reinforcement component 3 includes longitudinal bars 33, outer horizontal bars 32, diagonal braces 31, and inner horizontal bars 34. The outer horizontal bars 32 are installed at the lower edge of the outer side of the cantilevered balcony 2, and the inner horizontal bars 34 are fixed to the outer side of the outer wall 12. Multiple longitudinal bars 33 connect the outer horizontal bars 32 and the inner horizontal bars 34, and the longitudinal bars 33 are embedded in the lower bottom surface of the cantilevered balcony 2. Both ends of the outer horizontal bars 32 are connected to diagonal braces 31, and the other ends of the two diagonal braces 31 pass through the outer wall 12 and are connected to different vertical reinforcing columns 42. The external reinforcement component 3 provides multi-point support for the balcony floor and outer edge, and also achieves a concealed arrangement. A reliable tie system is constructed through the diagonal braces 31, which efficiently transfers the load and bending moment on the outer side of the balcony to the vertical reinforcing columns 42, and then to the main beam, significantly reducing the stress on the outer wall 12.

[0027] The diagonal brace 31 is embedded in the side railing 21 of the cantilever balcony 2; the portion of the diagonal brace 31 located outside the outer wall 12 is always lower than the upper edge of the side railing 21. The diagonal brace 31 is embedded inside the side railing 21, achieving a fully concealed arrangement, maintaining the neatness and aesthetics of the building facade, and delaying corrosion and aging in harsh environments, thus extending its service life. It simultaneously considers practicality and aesthetics.

[0028] A prestressed strip 7 is provided above the longitudinal rod 33. Both ends of the prestressed strip 7 are fixed to the longitudinal rod 33, and the middle of the prestressed strip 7 has an upward arching stress. At the connecting rod 6: the lower part of the connecting rod 6 is provided with two radial protrusions 62 facing opposite directions. The distal end of the radial protrusions 62 has a flat portion 61. The thickness of the two radial protrusions 62 is the same as the thickness of the prestressed strip 7 and the longitudinal rod 33. The two radial protrusions 62 can extend into the rectangular holes on the prestressed strip 7 and the longitudinal rod 33 respectively. When the connecting rod 6 rotates, it applies forces in opposite directions to the prestressed strip 7 and the longitudinal rod 33 through the two radial protrusions 62 respectively. The prestressed strip 7 can actively counteract the downward deflection trend caused by the self-weight of the balcony and the use load, close existing micro-cracks, and significantly improve the crack resistance of the structure. The prestressing force applied to the prestressed strip 7 when the connecting rod 6 rotates allows for flexible adjustment of the prestress by replacing the connecting rod 6 with different specifications. All components are hidden inside the balcony, which does not affect the use and appearance, and is convenient for installation and adjustment.

[0029] The internal reinforcement component 5 includes an internal tie rod 52 and an anchor rod 53. The anchor rod 53 is fixed within the balcony floor 23 of the cantilevered balcony 2. One end of the internal tie rod 52 is connected to the anchor rod 53, and the other end is connected to the vertical reinforcing column 42 or the indoor ground of the main building 1. When the other end of the internal tie rod 52 is connected to the vertical reinforcing column 42, a horizontal support rod 54 is connected between the lower ends of the two vertical reinforcing columns 42, and the internal tie rod 52 and the horizontal support rod 54 are fixedly connected by bolts. When the other end of the internal tie rod 52 is connected to the indoor ground of the main building 1, an internal embedded space frame 51 is embedded under the ground of the main building 1, and the internal embedded space frame 51 is fixed by expansion bolts. The internal tie rod 52 and the internal embedded space frame 51 are fixedly connected by bolts. The internal reinforcement component 5 forms a tie system from inside the balcony, forming a two-way constraint with the external reinforcement component 3. The inner tie rod 52 can flexibly choose its anchoring method to adapt to different site conditions, offering strong versatility: it can transfer the load to the main beam or distribute the load to the ground of the main building 1, avoiding force transmission through the outer wall 12. The connecting rod 6 is installed in the balcony floor 23 of the cantilevered balcony 2. The lower end and upper end of the connecting rod 6 are connected to the outer reinforcement component 3. Both the upper and lower ends of the connecting rod 6 have external threads to facilitate the connection of nuts and to fix the longitudinal rod 33 to the inner tie rod 52. The connecting rod 6 achieves vertical connection between the outer reinforcement component 3 and the inner reinforcement component 5, forming a unified whole between the inner and outer reinforcement structures, avoiding uneven local stress, and ensuring coordinated force transmission among the components. Simultaneously, the connecting rod 6 is embedded in the balcony floor 23, achieving a concealed arrangement that does not affect the use or appearance of the balcony.

[0030] The above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation; it is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom remain within the scope of this technology.

Claims

1. A prefabricated building reinforcement structure for reinforcing cantilevered balconies (2) on the main body (1) of a building, characterized in that: include: The reinforcing frame (4) includes an upper clamp (41), a lower clamp (43), and a vertical reinforcing column (42); the upper clamp (41) is clamped to the upper crossbeam (11) of the main building (1); the lower clamp (43) is clamped to the lower crossbeam (13) of the main building (1); the vertical reinforcing column (42) is connected between the upper clamp (41) and the lower clamp (43) and is embedded in the outer wall (12) of the main building (1); The external reinforcement component (3) includes longitudinal bars (33), outer horizontal bars (32), diagonal braces (31) and inner horizontal bars (34); the outer horizontal bars (32) are installed at the lower edge of the outer side of the cantilever balcony (2), and the inner horizontal bars (34) are fixed to the outer side of the outer wall (12); multiple longitudinal bars (33) are connected between the outer horizontal bars (32) and the inner horizontal bars (34), and the longitudinal bars (33) are embedded in the lower bottom surface of the cantilever balcony (2); both ends of the outer horizontal bars (32) are connected to diagonal braces (31), and the other ends of the two diagonal braces (31) pass through the outer wall (12) and are connected to different vertical reinforcing columns (42); The internal reinforcement component (5) includes an internal tie rod (52) and an anchor rod (53); the anchor rod (53) is fixed inside the balcony floor (23) of the cantilever balcony (2); one end of the internal tie rod (52) is connected to the anchor rod (53), and the other end is connected to the vertical reinforcing column (42) or the indoor ground of the main building (1); The connecting rod (6) is installed in the balcony floor (23) of the cantilevered balcony (2). The lower end of the connecting rod (6) is connected to the external reinforcement component (3), and the upper end is connected to the external reinforcement component (3).

2. The prefabricated building reinforcement structure according to claim 1, characterized in that: The upper clamp (41) includes an inner clamp (411), an outer clamp (412), and a through bolt (413); the inner clamp (411) is Z-shaped, with its upper end abutting against the inner surface of the upper beam (11) and its lower end abutting against the inner surface of the outer wall (12); the upper end of the outer clamp (412) abutting against the outer surface of the upper beam (11) and its lower end abutting against the outer surface of the outer wall (12); the through bolt (413) passes through the outer wall (12) and connects the inner clamp (411) and the outer clamp (412) to tighten them.

3. The prefabricated building reinforcement structure according to claim 2, characterized in that: The lower clamp (43) has the same structure as the upper clamp (41).

4. The prefabricated building reinforcement structure according to claim 2, characterized in that: The vertical reinforcing column (42) is made of channel steel, and its groove faces the outer wall (12); stress tension seats (421) are fixed at the upper and lower ends of the groove of the vertical reinforcing column (42), and stress tension rods (422) are connected between the two stress tension seats (421); when in use, the stress tension rods (422) are in a tensioned state so that the middle part of the vertical reinforcing column (42) generates prestress towards the interior.

5. The prefabricated building reinforcement structure according to claim 4, characterized in that: The vertical reinforcing column (42) is provided with a connecting piece (44) at the connection point with the upper clamp (41) and the lower clamp (43). One end of the connecting piece (44) extends into the groove of the vertical reinforcing column (42) and is fixed by bolts, and the other end extends to the outside of the inner clamp (411) and is fixedly connected to the inner clamp (411) by bolts.

6. The prefabricated building reinforcement structure according to claim 1, characterized in that: The diagonal brace (31) is embedded in the side railing (21) of the cantilever balcony (2); the part of the diagonal brace (31) located outside the outer wall (12) is always lower than the upper edge of the side railing (21).

7. The prefabricated building reinforcement structure according to any one of claims 1-6, characterized in that: A prestressed strip (7) is provided above the longitudinal rod (33). Both ends of the prestressed strip (7) are fixed on the longitudinal rod (33), and the middle part of the prestressed strip (7) has an upward arching stress.

8. The prefabricated building reinforcement structure according to claim 7, characterized in that: The lower part of the tandem rod (6) is provided with two radial protrusions (62) facing opposite directions. The far end of the radial protrusions (62) has a flat portion (61). The thickness of the two radial protrusions (62) is the same as the thickness of the prestressed bar (7) and the longitudinal bar (33). The two radial protrusions (62) can extend into the rectangular holes on the prestressed bar (7) and the longitudinal bar (33) respectively. When the tandem rod (6) rotates, it applies forces in opposite directions to the prestressed bar (7) and the longitudinal bar (33) respectively through the two radial protrusions (62).

9. The prefabricated building reinforcement structure according to claim 8, characterized in that: The upper and lower ends of the connecting rod (6) are both threaded to facilitate the connection of nuts and to fix the longitudinal rod (33) and the inner tie rod (52).

10. The prefabricated building reinforcement structure according to claim 7 or 8, characterized in that: When the other end of the inner tie rod (52) is connected to the vertical reinforcing column (42), a horizontal seat rod (54) is connected between the lower ends of the two vertical reinforcing columns (42), and the inner tie rod (52) and the horizontal seat rod (54) are fixedly connected by bolts; When the other end of the inner tie rod (52) is connected to the indoor ground of the building body (1), an inner embedded grid frame (51) is buried under the ground of the building body (1), and the inner embedded grid frame (51) is fixed by expansion bolts; the inner tie rod (52) and the inner embedded grid frame (51) are fixedly connected by bolts.

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