Multi-point staged jacking structure for large-span structure in limited space and construction method

Abstract

The application provides a multi-point staged jacking structure for a large-span structure in a limited space and a construction method, which comprises a steel support, a steel structure arranged on the steel support, a bracing frame arranged between the two steel supports, a sectional jig structure arranged on the bracing frame and used for supporting the bracing frame and the steel structure, an inclined support rod arranged on one side of the jig structure and used for supporting the jig structure, a bracing structure arranged on the jig structure, the bracing structure comprising a supporting square steel pipe, a steel plate base arranged on the top of the supporting square steel pipe, a jacking device arranged on the top surface of the steel plate base, and stress support members symmetrically arranged at the two ends of the jacking device. The application improves the safety and reliability of jacking operation and can be applied to various unexpected situations, thereby ensuring high efficiency and high stability of the jacking process.

Description

Technical Field

[0001] This invention relates to a multi-point, graded jacking structure for large spans in a confined space and its construction method. Background Technology

[0002] Steel structure buildings have been widely used in many fields such as high-rise buildings, long-span bridges, and stadiums. Due to the excellent properties of steel itself, the high degree of industrialization in manufacturing and installation, and the ability to achieve special shapes that traditional buildings cannot achieve, as well as its advantages over traditional brick-concrete and reinforced concrete structures such as "light weight, good earthquake resistance, good durability, large span, energy saving and environmental protection, and good economy", its application scope is gradually increasing.

[0003] However, in recent years, some large-span spatial structures in various regions have experienced a decline in load-bearing capacity, increased deformation, and reduced safety due to steel fatigue or corrosion after reaching a certain service life. Therefore, designing a lifting structure with strong load-bearing capacity and high safety is the research direction of this invention. Summary of the Invention

[0004] This invention provides a multi-point, graded jacking structure for large-span structures in confined spaces and a construction method thereof, which can effectively solve the above-mentioned problems.

[0005] This invention is implemented as follows:

[0006] A multi-point, staged jacking structure for large spans in confined space and its construction method, including:

[0007] Steel support frame; steel structure mounted on the steel support frame; top support frame mounted between the two steel supports;

[0008] The segmented frame structure installed on the top support frame is used to support the top support frame and the steel structure.

[0009] An inclined support rod is provided on one side of the tire frame structure, which is used to support the tire frame structure.

[0010] A top support structure is provided on the frame structure; the top support structure includes a supporting square steel pipe, a steel plate base provided on the top of the supporting square steel pipe, a lifting device provided on the top surface of the steel plate base, stress support members symmetrically provided at both ends of the lifting device, a support seat provided at one end of the lifting device and on the top surface of one of the stress support members, and a semi-circular groove formed on the support seat.

[0011] The frame structure supports the top support frame and the steel structure, while the inclined support rod supports the frame structure to keep it stable. At the same time, the stress support member and the support seat at one end of the lifting device are connected and fixed to the top support frame. During lifting, the lifting device drives the top support frame and the steel structure to move upward and backward.

[0012] As a further improvement, the frame structure includes several steel pipe columns, several square steel pipes arranged sequentially on the steel pipe columns, several angle steel support frames arranged between the square steel pipes, a pad block arranged on one of the square steel pipes, angle steel beams symmetrically arranged on both sides of the steel pipe columns, and diagonal angle steels arranged between the angle steel beams.

[0013] As a further improvement, the inclined support rod includes a connecting seat, a connecting member disposed on the top surface of the connecting seat and connected to the inclined support rod, and first bolts symmetrically disposed on the connecting seat.

[0014] As a further improvement, the stress support includes stiffening ribs and stress frames symmetrically arranged on the stiffening ribs; the stiffening ribs are sleeved around the outer periphery of the hydraulic cylinder in the lifting device to keep the hydraulic cylinder stable, while the piston rod connected to the hydraulic cylinder is connected to another set of stress supports to support the top support frame.

[0015] As a further improvement, a rubber pad is provided on the semicircular groove, and a central rod for the insertion of the top support frame is provided in the middle of the semicircular groove.

[0016] As a further improvement, the cylinder and the piston rod also include a stabilizing buffer structure; the stabilizing buffer structure includes a first ring plate and a second ring plate, a positioning rod and an emergency limiting clamping member arranged around the first ring plate and the second ring plate, a compression spring sleeved on the outer periphery of the positioning rod, and a limiting contact ring arranged at one end of the positioning rod.

[0017] As a further improvement, the emergency limiting clamp includes a first plate and a second plate that are movably connected, a first pivot seat disposed on one side of the second plate, a first connecting rod movably disposed between the two first pivot seats, a third pivot seat disposed on the second ring plate, and a second connecting rod movably disposed between the two third pivot seats. When the second ring plate and the first ring plate are subjected to force, the second connecting rod drives the limiting plate to fit against the outer wall of the piston rod, while the first plate and the second plate move in the same way as the second connecting rod, so that the first pivot seat and the first connecting rod further enhance the fit between the limiting plate and the piston rod.

[0018] As a further improvement, the piston rod also includes a positioning support structure; the positioning support structure includes a sleeve plate, support positioning plates symmetrically arranged on both sides of the sleeve plate, a triangular plate disposed at the other end of the support positioning plate, a first seat disposed at one end of the support positioning plate, a positioning latching rod disposed in the middle of the first seat, a second seat disposed between the positioning latching rods, a reserved groove formed at both ends of the second seat, a second bolt disposed in the reserved groove, and an arched opening formed in the middle of the second seat.

[0019] As a further improvement, the support positioning plate is provided with a first rod and a second rod on its two sides, and a third bolt connecting the first rod and the second rod.

[0020] The present invention further provides a construction method for a multi-point graded jacking structure of a large-span structure in a confined space, comprising the following steps;

[0021] S1. Conduct a site survey to clarify the scope and requirements of the construction, clean up the construction site, and set up a safe construction platform and support.

[0022] S2. Install the steel support on the foundation to ensure it is stable and can bear the weight of the subsequent structure;

[0023] S3. Erect the steel structure on the steel support;

[0024] S4. Subsequently, several of the steel pipe columns are connected by the mounting base, the square steel pipe is welded to the steel pipe column, and the angle steel support frame is welded to the square steel pipe, thereby improving the strength of the steel pipe column.

[0025] S5. When height requirements need to be met, the multi-segment frame structure is stacked sequentially so that the top support structure can support the steel structure and the top support frame.

[0026] S6. After the tire frame structure is stacked, the support seat in the top support structure is connected to the crossbar in the top support frame. The semicircular groove and the central rod restrict the crossbar, so that the crossbar is fixed at the center position of the support seat by the central rod. At the same time, the rubber pad in the semicircular groove increases the friction between the crossbar and the semicircular groove, further improving stability.

[0027] S7. When the height of the steel structure and the top support frame needs to be further adjusted, the oil cylinder and the piston rod in the top support structure drive the support seat to move upward, thereby precisely adjusting the height of the steel structure and the top support frame.

[0028] S8. Thus, the steel structure and the top support frame can be stably supported, and the steel structure and the top support frame can also be further adjusted.

[0029] The beneficial effects of this invention are:

[0030] (1) This invention improves the stability and safety of the jacking process through a jacking structure. Through carefully designed components such as steel supports, steel structures, jacking frames, segmented jig structures, inclined support rods, jacking structures, and stress support members, this structure enables multi-point, staged jacking of large-span structures within a limited space. In particular, the design of the central rod directly contacting the semi-circular groove reduces energy loss and improves jacking efficiency. Furthermore, the uniform distribution at the center position helps resist lateral forces, maintaining the smoothness and safety of the jacking process. Overall, this structural design optimizes the force transmission path, reduces local stress concentration, and improves the structure's load-bearing capacity and durability.

[0031] (2) In an emergency situation where the piston rod drops rapidly due to external pressure, the stabilizing buffer structure in this invention can effectively limit the dropping speed of the piston rod, thereby protecting the structure from damage and avoiding safety accidents. Specifically, the rapid response and linkage mechanism of the emergency limit clamp can act in time when the piston rod is impacted, and slow down or prevent its descent by fitting the limit plate with the outer wall of the piston rod. This design significantly improves the safety and reliability of the lifting structure in the face of emergencies.

[0032] (3) Through the design of the positioning support structure, especially the synergistic effect of components such as the sleeve plate, support positioning plate, triangular plate, first seat, positioning snap rod, second seat, reserved groove, second bolt and arched opening, this invention can provide additional support and stability when the weight of the steel structure and top support frame exceeds the bearing capacity of the stress support and support seat or becomes unstable due to external forces. This design effectively prevents excessive movement or tilting of the steel structure and top support frame, ensures the safety of the jacking process and the integrity of the structure, thereby improving the reliability of the entire jacking structure and the safety of the project. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is the front view of Embodiment 1 of the present invention.

[0035] Figure 2 This is a schematic diagram of the tire frame structure in Embodiment 1 of the present invention.

[0036] Figure 3 This is a left view of the frame structure in Embodiment 1 of the present invention.

[0037] Figure 4 This is a schematic diagram of the top support structure in Embodiment 1 of the present invention.

[0038] Figure 5 This is a schematic diagram of the lifting of the top support structure in Embodiment 1 of the present invention.

[0039] Figure 6 This is a schematic diagram of the stable buffer structure in Embodiment 2 of the present invention.

[0040] Figure 7 This is a schematic diagram of the emergency limiting clamp in Embodiment 2 of the present invention.

[0041] Figure 8 This is a schematic diagram of Embodiment 3 of the present invention.

[0042] Figure 9 This is a schematic diagram of the positioning support structure in Embodiment 3 of the present invention.

[0043] Explanation of icon numbers:

[0044] 1. Steel support frame; 2. Steel structure; 3. Top support frame;

[0045] 4. Frame structure; 40. Steel pipe column; 41. Square steel pipe; 42. Angle steel support frame; 43. Mounting base; 44. Pad; 45. Angle steel beam; 46. Diagonal angle steel;

[0046] 5. Diagonal support rod; 50. Connecting seat; 51. Connecting piece; 52. First bolt;

[0047] 6. Top support structure; 60. Supporting square steel pipe; 61. Steel plate base; 62. Stiffening rib; 63. Stress frame; 67. Hydraulic cylinder; 68. Piston rod; 680. Support seat; 681. Semicircular groove; 682. Rubber pad; 683. Center rod;

[0048] 7. Stable buffer structure; 70. First ring plate; 71. Second ring plate; 72. Positioning rod; 73. Compression spring; 74. Limiting contact ring; 75. Emergency limiting clamping component; 750. First plate; 751. Second plate; 752. First pivot seat; 753. First connecting rod; 755. Third pivot seat; 756. Second connecting rod; 758. Limiting plate; 76. Reinforcing rod; 77. Bending part;

[0049] 8. Positioning support structure; 80. Sleeve plate; 81. Support positioning plate; 810. First seat body; 811. Positioning snap rod; 812. Second seat body; 813. Reserved groove; 814. Second bolt; 815. Arched opening; 82. Triangular plate; 83. First rod; 84. Second rod; 85. Third bolt. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0051] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] Example 1

[0053] Reference Figure 1-5 A multi-point graded jacking structure for a large span in a limited space includes a steel support 1; a steel structure 2 installed on the steel support 1; and a jacking frame 3 installed between two steel supports 1.

[0054] A segmented support frame structure 4, mounted on the top support frame 3, supports both the top support frame 3 and the steel structure 2. The support frame structure 4 includes several steel pipe columns 40, several square steel pipes 41 sequentially mounted on the steel pipe columns 40, several angle steel support frames 42 positioned between the square steel pipes 41, and a pad 44 mounted on one of the square steel pipes 41. The pad 44 ensures a more stable installation of the top support structure 6 on the support frame structure 4. Angle steel beams 45 are symmetrically arranged on both sides of the steel pipe columns 40, and diagonal angle steel 46 is positioned between the angle steel beams 45.

[0055] An inclined support rod 5 is provided on one side of the jig frame structure 4 to support the jig frame structure 4; the inclined support rod 5 includes a connecting seat 50, a connecting piece 51 provided on the top surface of the connecting seat 50 and connected to the inclined support rod 5, and a first bolt 52 symmetrically provided on the connecting seat 50.

[0056] The inclined support rod 5 can be telescopic or integrated; furthermore, the inclined support rod 5 is connected and fixed to the jig structure 4, which can provide multi-point synchronous lifting support for the jig structure 4, thereby ensuring the stability of the jig structure 4.

[0057] A top support structure 6 is installed on the frame structure 4. The top support structure 6 includes a supporting square steel pipe 60, a steel plate base 61 installed on the top of the supporting square steel pipe 60, a lifting device installed on the top surface of the steel plate base 61, stress support members symmetrically arranged at both ends of the lifting device, a support seat 680 installed at one end of the lifting device and on the top surface of one of the stress support members, and a semi-circular groove 681 formed on the support seat 680. Further, a rubber pad 682 is provided on the semi-circular groove 681, and a central rod 683 for the top support frame 3 to be inserted is provided in the middle of the semi-circular groove 681. It should be noted that the central rod 683, positioned in the middle of the semicircular groove 681, allows direct contact between the central rod 683 and the semicircular groove 681. This enables more efficient transmission of the lifting force, reducing energy loss and improving lifting efficiency. Simultaneously, the central position provides better stability because the central rod 683 can be evenly distributed at the center of the semicircular groove 681, which helps resist lateral forces that may be encountered during lifting. Furthermore, if the central rod 683 is positioned at the center of the semicircular groove, it will be more stable and less likely to deviate or tilt during lifting. This helps maintain the smoothness and safety of the lifting process, optimizes stress distribution, reduces local stress concentration, and thus improves the structure's load-bearing capacity and durability.

[0058] The stress support includes stiffening ribs 62 and stress frames 63 symmetrically arranged on the stiffening ribs 62. The stiffening ribs 62 are sleeved around the outer periphery of the hydraulic cylinder 67 in the lifting device to keep the hydraulic cylinder 67 stable. The piston rod 68 connected to the hydraulic cylinder 67 is connected to another set of stress support components to support the top support frame 3.

[0059] Furthermore, an angle B exists between the stress frame 63 and the steel plate base 61, where 30 ≤ B ≤ 90 degrees. This is to ensure that the stress frame 63 can effectively support the stiffening rib 62. In one embodiment, B is approximately 45 degrees. The advantage of this arrangement is that it improves the dynamic stability of the structure, especially when lateral forces may be encountered during the lifting process. The angled stress frame 63 can provide a better force transmission path, allowing the lifting force to act more directly on the top support frame 3, thereby improving lifting efficiency.

[0060] Furthermore, to adapt to different jacking conditions and construction requirements, the stress frame 63 in this case can also be configured with an adjustable angle. This design allows construction personnel to adjust the angle of the stress frame 63 according to the actual situation to achieve the best jacking effect and construction convenience. The adjustable angle stress frame 63 provides greater flexibility. It should be noted that the specific implementation needs to be set according to the application scenario and application conditions.

[0061] Working principle:

[0062] First, the steel support 1 provides a solid foundation for the entire structure, and the steel structure 2 is installed on these supports to withstand the forces during the jacking process. The top support frame 3 is located between two steel supports, serving as the main support point during the jacking process. The segmented frame structure 4 is installed on the top support frame and consists of steel pipe columns 40, square steel pipes 41, angle steel support frames 42, pads 44, angle steel beams 45, and diagonal angle steel 46, forming a stable support frame. This frame not only supports the top support frame 3 and the steel structure 2 but also further enhances the overall structural stability through the reinforcement of the diagonal support rods 5. The top support structure 6 is the core of the jacking process. It is installed on the frame structure 4 and includes supporting square steel pipes 60, a steel plate base 61, and a jacking device. The hydraulic cylinder 67 and piston rod 68 in the jacking device extend and retract during jacking. The stability of the hydraulic cylinder 67 during jacking is ensured by the stabilizing effect of stress support members, including stiffening ribs 62 and stress frames 63. The piston rod 68 is connected to another set of stress support members. These support members support the top support frame 3, allowing the jacking force to be effectively transmitted to the steel structure 2. During the jacking process, the jacking device is activated, and the piston rod 68... 8. Pushing the top support frame 3 and steel structure 2 upward, the rubber pad 682 and center rod 683 on the semi-circular groove 681 ensure that the top support frame 3 is stably connected during the lifting process, preventing slippage or instability. The stabilizing buffer structure 7 includes a first ring plate 70, a second ring plate 71, a positioning rod 72, an emergency limit clamp 75, a compression spring 73, and a limit contact ring 74, providing additional stability and buffering for the lifting process, ensuring the smoothness and safety of the lifting process. When the emergency limit clamp 75 is under force, it... Through the coordinated action of the first plate 750 and the second plate 751, as well as the first connecting rod 753 and the second connecting rod 756, the fit between the limiting plate 758 and the piston rod 68 is strengthened, further ensuring safety during the jacking process. The positioning support structure 8 includes a sleeve plate 80, a support positioning plate 81, a triangular plate 82, a first seat 810, a positioning locking rod 811, a second seat 812, a reserved groove 813, a second bolt 814, and an arched opening 815, ensuring precise positioning and stability after jacking. The design of the entire system allows for multi-point, staged jacking of large-span structures within a limited space, while ensuring the stability and safety of the jacking process. It is suitable for projects requiring precise jacking, such as bridges and large building structures. This structural design allows for multi-point, staged jacking in complex environments, while ensuring the stability and safety of the jacking process.

[0063] Example 2

[0064] A multi-point, staged jacking structure for large-span structures in a limited space.

[0065] When steel structure 2 and top support frame 3 are compressed by external forces, and piston rod 68 descends rapidly, refer to the following situation: Figure 6-7 The cylinder 67 and piston rod 68 also include a stabilizing buffer structure 7; the stabilizing buffer structure 7 includes a first ring plate 70 and a second ring plate 71, a positioning rod 72 and an emergency limiting clamping member 75 arranged around the first ring plate 70 and the second ring plate 71, a compression spring 73 sleeved on the outer periphery of the positioning rod 72, and a limiting contact ring 74 arranged at one end of the positioning rod 72.

[0066] The emergency limiting clamp 75 includes a first plate 750 and a second plate 751 that are movably connected, a first pivot seat 752 disposed on one side of the second plate 751, a first connecting rod 753 movably disposed between the two first pivot seats 752, a third pivot seat 755 disposed on the second ring plate 71, and a second connecting rod 756 movably disposed between the two third pivot seats 755. When the second ring plate 71 and the first ring plate 70 are subjected to force, the second connecting rod 756 drives the limiting plate 758 to fit against the outer wall of the piston rod 68, while the first plate 750 and the second plate 751 move in the same way as the second connecting rod 756, so that the first pivot seat 752 and the first connecting rod 753 further enhance the fit between the limiting plate 758 and the piston rod 68.

[0067] It should be noted that since the connecting structure formed by the third pivot seat 755 and the second connecting rod 756 is symmetrically arranged on the limiting plate 758, when the first ring plate 70 is subjected to force, it will move directly downward and cause the connecting structure to drive the limiting plate 758 to fit against the piston rod 68. In order to ensure the strength of the connecting structure, the first pivot seat 752 and the first connecting rod 753 on the first plate 750 and the second plate 751 are also connected to the limiting plate 758. When the connecting structure bends, the movable first plate 750 and the second plate 751 will also drive the first pivot seat 752 and the first connecting rod 753 to fit against the piston rod 68. Furthermore, the other two ends of the first plate 750 and the second plate 751 are movably connected to the first ring plate 70 and the second ring plate 71 (not shown in the figure), thus forming a linkage effect.

[0068] Working principle:

[0069] The first ring plate 70 and the second ring plate 71 are respectively installed at both ends of the piston rod 68, providing basic support for the entire stable buffer structure. The first ring plate 70 and the second ring plate 71 are connected by a positioning rod 72 to form a closed ring structure, ensuring the stability of the piston rod 68 during the lifting process. The positioning rod 72 is located between the first ring plate 70 and the second ring plate 71, and its function is to fix the emergency limit clamp 75 and maintain its position. The positioning rod 72 also interacts with the compression spring 73 to provide preload force to the piston rod, ensuring close contact between the piston rod 68 and the first ring plate 70 and the second ring plate 71 during the lifting process. The emergency limit clamp 75 is composed of a first plate 750, a second plate 751, a first pivot seat 752, a first connecting rod 753, a third pivot seat 755, and a second connecting rod 756. During normal lifting, the clamp is tightly secured. The emergency limit clamp 75 remains in a relaxed state. When the piston rod 68 is subjected to external pressure and descends rapidly, the emergency limit clamp 75 responds quickly. The first plate 750 and the second plate 751, through the linkage of the first connecting rod 753 and the second connecting rod 756, drive the limit plate 758 to fit against the outer wall of the piston rod 68, limiting the descent speed of the piston rod 68. The compression spring 73 is sleeved on the outer circumference of the positioning rod 72 to provide preload for the piston rod 68. During the lifting process, the hydraulic cylinder 67 provides power through the hydraulic system to push the piston rod 68 upward, thereby driving the lifting structure to rise. The compression spring 73 in the stabilizing buffer structure 7 provides buffering to absorb the impact and vibration during the lifting process. This design ensures that even if a sudden external force is encountered during the lifting process, the lifting structure can react quickly to avoid possible structural damage or safety accidents. In summary, these components work together to form a stable buffer system. It not only provides stability during normal lifting, but also responds quickly in emergency situations, such as when the piston rod 68 is subjected to external pressure and descends rapidly. It restricts the movement of the piston rod through the mechanical action of the emergency limit clamp, thereby avoiding possible structural damage or safety accidents.

[0070] Example 3

[0071] A multi-point, staged jacking structure for large-span structures in a limited space.

[0072] When the weight of steel structure 2 and top support frame 3 exceeds the bearing capacity of stress support members and support base 680, and is subjected to external forces, causing instability in steel structure 2 and top support frame 3, refer to Figure 8-9The piston rod 68 also includes a positioning support structure 8; the positioning support structure 8 includes a sleeve plate 80, support positioning plates 81 symmetrically arranged on both sides of the sleeve plate 80, a triangular plate 82 arranged at the other end of the support positioning plate 81, a first seat 810 arranged at one end of the support positioning plate 81, a positioning latching rod 811 arranged in the middle of the first seat 810, a second seat 812 arranged between the positioning latching rods 811, a reserved groove 813 formed at both ends of the second seat 812, a second bolt 814 arranged in the reserved groove 813, and an arched opening 815 formed in the middle of the second seat 812.

[0073] The two sides of the support positioning plate 81 are respectively provided with a first rod 83 and a second rod 84, and a third bolt 85 connecting the first rod 83 and the second rod 84.

[0074] Working principle:

[0075] The sleeve plate 80 is the main part of the positioning support structure. It is connected to the piston rod 68 and provides the foundation for the entire support structure. Support positioning plates 81 are symmetrically arranged on both sides of the sleeve plate 80. Their function is to provide support force and ensure the stability of the piston rod 68 during the lifting process. A triangular plate 82 is located at the other end of the support positioning plate. Its triangular geometry provides additional stability and helps to disperse and resist external forces. The first seat 810 and the positioning latching rod 811 are located at one end of the support positioning plate 81. They work together to provide precise positioning for the piston rod 68 during the lifting process. The second seat 812 is located at the positioning latching rod. Between the rods 811, pre-drilled slots 813 are formed at both ends for installing second bolts 814, further fixing and stabilizing the entire structure. The pre-drilled slots 813 and second bolts 814 are used to fix the second base 812, ensuring it does not move during jacking, thus providing stable support. An arched opening 815 is located in the middle of the second base 812, used to reduce structural weight or as a mounting position for other components. First rods 83 and second rods 84 are respectively provided on both sides of the support positioning plate, connected by third bolts 85. This increases the stability of the support positioning plate 81 and allows adjustment of the support force during jacking. During jacking, if the weight of the steel structure 2 and the top support frame 3 exceeds the bearing capacity of the stress support members and support base 680, or becomes unstable due to external forces, the positioning support structure 8 provides additional support and stability through the synergistic action of its various components. This prevents excessive movement or tilting of the steel structure 2 and the top support frame 3, ensuring the safety of the jacking process and the integrity of the structure.

[0076] Furthermore, the first base 810 is provided with fourth bolts (not shown in the figure) at both ends, which can fix the second base 812 to the top support frame 3, thereby increasing the support area with the support frame 3 and improving the stability of the structure.

[0077] In summary, this invention addresses the problems of decreased load-bearing capacity, increased deformation, reduced safety, and failure to meet load-bearing requirements in existing spatial structures after a certain service life, as well as the inability of the original structure to meet load-bearing requirements due to changes in the function of large-span spatial structures. By establishing permanent support nodes in the structure, the load of the spatial structure is sequentially transferred to the formwork structure 4, and finally transferred to the ground or the next layer of structural slab, ensuring the safety of the spatial structure. At the same time, in the event of an accident, this invention can also prevent and further guarantee the stability and safety of the entire structure.

[0078] The present invention further provides a construction method for a multi-point graded jacking structure of a large-span structure in a confined space, comprising the following steps;

[0079] S1. Conduct a site survey to clarify the scope and requirements of the construction, clean up the construction site, and set up a safe construction platform and support.

[0080] S2. Install steel support 1 on the foundation to ensure it is stable and can bear the weight of the subsequent structure;

[0081] S3. Build steel structure 2 on steel support 1;

[0082] S4. Subsequently, several steel pipe columns 40 are connected by mounting bases 43, square steel pipes 41 are welded to the steel pipe columns 40, and angle steel support frames 42 are welded to the square steel pipes 41, thereby improving the strength of the steel pipe columns 40.

[0083] S5. When height requirements need to be met, the multi-section frame structure 4 is stacked in sequence so that the top support structure 6 can support the steel structure 2 and the top support frame 3.

[0084] S6. After the frame structure 4 is stacked, the support seat 680 in the top support structure 6 is connected to the crossbar in the top support frame 3. The semi-circular groove 681 and the center rod 683 restrict the crossbar, so that the crossbar is fixed at the center position of the support seat 680 through the center rod 683. At the same time, the rubber pad 682 in the semi-circular groove 681 increases the friction between the crossbar and the semi-circular groove 681, further improving the stability.

[0085] S7. When the height of the steel structure 2 and the top support frame 3 needs to be further adjusted, the oil cylinder 67 and piston rod 68 in the top support structure 6 drive the support seat 680 to move upward, thereby precisely adjusting the height of the steel structure 2 and the top support frame 3.

[0086] S8. Thus, the steel structure 2 and the top support frame 3 can be stably supported, and the steel structure 2 and the top support frame 3 can also be further adjusted.

[0087] In step S7, the equation of motion (1) of the steel structure 2 and the top support 3 as a whole in the vertical direction satisfies:

[0088] F-mg-F d +F e =ma, where a is the overall vertical upward acceleration of steel structure 2 and top support frame 3, mg is the gravitational force acting on steel structure 2 and top support frame 3, where g is the acceleration due to gravity, and F d Damping force and F e External disturbance force. Damping force F d Generally, it is directly proportional to the speed of the piston rod, and its direction is opposite to the direction of the speed, which can be expressed as F. d =-cv, where c is the damping coefficient and v is the velocity of the piston rod; external disturbance force F e It is a randomly changing force whose magnitude and direction change over time, making it difficult to describe precisely. It is usually represented by a random perturbation term in the model.

[0089] Substitute the damping force F e From the expression, we obtain the equation of motion (2):

[0090] F-mg+cv+F e =ma.

[0091] The dynamic characteristics of a hydraulic cylinder can be reflected by the compressibility of the hydraulic fluid and the inertia of the piston. Assume the bulk modulus of the hydraulic fluid is K, and the inertial mass of the piston is m. p Let A be the cross-sectional area of ​​the piston. Then, the relationship between the pressure change inside the cylinder and the displacement and velocity of the piston rod can be expressed as:

[0092]

[0093] Substituting the description of the dynamic characteristics of the hydraulic cylinder into the motion equation (2), we get:

[0094] .

[0095] After sorting, we get:

[0096]

[0097] This is a second-order nonlinear differential equation that incorporates the dynamic characteristics of the hydraulic cylinder, the damping effect of the system, and external disturbance factors. By solving this equation, the variation of the piston rod displacement x with time can be obtained, thereby enabling precise control of the height of steel structure 2 and top support frame 3.

[0098] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A multi-point staged jacking structure for a long-span structure in a confined space, characterized in that, The utility model provides a kind of steel support (1);Steel structure (2) is arranged on the steel support (1), and top support frame (3) is arranged between the two steel supports (1); Segmented jig frame structure (4) is arranged on the top support frame (3), which is used to support the top support frame (3) and the steel structure (2); Inclined support rod (5) is arranged on one side of the jig frame structure (4), which is used to support the jig frame structure (4); Top support structure (6) is arranged on the jig frame structure (4);The top support structure (6) includes support square steel pipe (60), steel plate base (61) arranged on the top of the support square steel pipe (60), jacking device arranged on the top surface of the steel plate base (61), stress support symmetrically arranged on both ends of the jacking device, support seat (680) arranged on one end of the jacking device and on the top surface of one of the stress supports, semicircular groove (681) formed on the support seat (680); The jig frame structure (4) supports the top support frame (3) and the steel structure (2), and the inclined support rod (5) supports the jig frame structure (4), so that the jig frame structure (4) remains stable, and meanwhile, the stress support on one end of the jacking device and the support seat (680) are connected and fixed with the top support frame (3), and when jacking, the jacking device drives the top support frame (3) and the steel structure (2) to move up and down. The jig frame structure (4) includes a plurality of steel pipe columns (40), a plurality of the steel pipe columns (40) are connected by mounting seats (43), a plurality of square steel pipes (41) are arranged on the steel pipe columns (40) in sequence, a plurality of angle steel support frames (42) are arranged between the square steel pipes (41), a plurality of pads (44) are arranged on one of the square steel pipes (41), angle steel cross beams (45) are symmetrically arranged on both sides of the steel pipe columns (40), and inclined angle steels (46) are arranged between the angle steel cross beams (45).

2. The multi-point staged lifting structure for a long-span structure in a confined space according to claim 1, wherein, The inclined support rod (5) includes a connecting seat (50), a connecting piece (51) arranged on the top surface of the connecting seat (50) and connected with the inclined support rod (5), and first bolts (52) symmetrically arranged on the connecting seat (50).

3. The multi-point staged lifting structure for a long-span structure in a confined space according to claim 1, characterized in that, The stress support includes stiffening ribs (62) and stress frames (63) symmetrically arranged on the stiffening ribs (62);The stiffening ribs (62) are sleeved on the outer periphery of the oil cylinder (67) in the jacking device, so that the oil cylinder (67) remains stable, and the piston rod (68) connected with the oil cylinder (67) is connected with another group of stress supports, so as to support the top support frame (3).

4. The multi-point staged lifting structure for a long-span structure in a confined space according to claim 2, wherein, Rubber pads (682) are arranged on the semicircular groove (681), and a center rod (683) for inserting the top support frame (3) is arranged in the middle of the semicircular groove (681).

5. The multi-point staged lifting structure for a long-span structure in a confined space according to claim 4, wherein, ​ 6. The multi-point staged lifting structure for a long-span structure in a confined space according to claim 5, wherein, The oil cylinder (67) and the piston rod (68) further comprise a stable buffer structure (7); the stable buffer structure (7) comprises a first ring plate (70) and a second ring plate (71), a positioning rod (72) and an emergency limiting clamping piece (75) which are arranged between the first ring plate (70) and the second ring plate (71), a compression spring (73) which is sleeved on the outer periphery of the positioning rod (72), and a limiting contact ring (74) which is arranged at one end of the positioning rod (72).

7. The multi-point staged lifting structure for a long-span structure in a confined space according to claim 6, wherein, The emergency limiting clamping piece (75) comprises a first plate (750) and a second plate (751) which are movably connected, a first pivot seat (752) which is arranged on one side surface of the second plate (751), a first connecting rod (753) which is movably arranged between two first pivot seats (752), a third pivot seat (755) which is arranged on the second ring plate (71), and a second connecting rod (756) which is movably arranged between two third pivot seats (755); when the second ring plate (71) and the first ring plate (70) are stressed, the second connecting rod (756) drives the limiting plate (758) to be attached to the outer wall of the piston rod (68), and the first plate (750) and the second plate (751) make the same movement as the second connecting rod (756), so that the first pivot seat (752) and the first connecting rod (753) further strengthen the attachment of the limiting plate (758) and the piston rod (68).

8. The multi-point staged lifting structure for a long-span structure in a confined space according to claim 7, wherein, The piston rod (68) further comprises a positioning support structure (8); the positioning support structure (8) comprises a sleeve plate (80), support positioning plates (81) which are symmetrically arranged on both sides of the sleeve plate (80), triangular plates (82) which are arranged at the other ends of the support positioning plates (81), first seat bodies (810) which are arranged at one end of the support positioning plates (81), positioning clamping rods (811) which are arranged in the middle of the first seat bodies (810), second seat bodies (812) which are arranged between the positioning clamping rods (811), reserved grooves (813) which are formed at both ends of the second seat bodies (812), second bolts (814) which are arranged in the reserved grooves (813), and arc-shaped openings (815) which are formed in the middle of the second seat bodies (812).

9. The multi-point staged lifting structure for a long-span structure in a confined space according to claim 8, wherein, First rods (83) and second rods (84) are arranged on the two side surfaces of the support positioning plates (81), respectively, and third bolts (85) are connected with the first rods (83) and the second rods (84).

10. A method for constructing a multi-point staged lifting structure of a large-span structure in a limited space, comprising the multi-point staged lifting structure of a large-span structure in a limited space according to any one of claims 8-9, characterized in that, The method comprises the following steps: S1, a construction site investigation is conducted to determine the construction range and requirements, the construction site is cleaned, and a safe construction platform and support are built; S2, the steel support (1) is installed on the foundation to ensure that it is stable and can bear the weight of the subsequent structure; S3, the steel structure (2) is built on the steel support (1); S4, then, a plurality of steel pipe columns (40) are connected by the mounting seats (43), the square steel pipes (41) are welded on the steel pipe columns (40), and the angle steel support frames (42) are welded on the square steel pipes (41), so as to improve the strength of the steel pipe columns (40); S5, when the height requirement needs to be met, the multi-section said cradle structure (4) is stacked in sequence, so that the said top support structure (6) supports the said steel structure (2) and the said top support frame (3); S6, when the said cradle structure (4) is stacked, the said support seat (680) in the said top support structure (6) is connected with the crossbar in the said top support frame (3), the said half-round groove (681) and the said center rod (683) limit the said crossbar, so that the said crossbar is fixed in the center position of the said support seat (680) through the said center rod (683), meanwhile, the said rubber pad (682) in the said half-round groove (681) increases the friction between the said crossbar and the said half-round groove (681), further improving the stability; S7, when the height of the said steel structure (2) and the said top support frame (3) needs to be further adjusted, the said oil cylinder (67) and the said piston rod (68) in the said top support structure (6) drive the said support seat (680) to move upward, so that the height of the said steel structure (2) and the said top support frame (3) can be accurately adjusted; S8, thus, the said steel structure (2) and the said top support frame (3) can be stably supported, and the said steel structure (2) and the said top support frame (3) can be further adjusted.

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