Prestressed reinforcement structure and method

Abstract

The present invention discloses a prestressed reinforcement structure and method, wherein the prestressed reinforcement structure includes a reinforced object, a prestressed tensioned self-balancing structure arranged below the reinforced object, and a support; the reinforced object includes a steel structure and a concrete structure; the reinforced object and the prestressed tensioned self-balancing structure are connected by a connecting plate. When prestress is applied to the prestressed tensioned self-balancing structure, one end of the entire prestressed tensioned self-balancing structure is hinged to the support, and the other end is slidingly hinged to the support, and the connecting plate partially releases the self-balancing pressure rod, the self-balancing pressure rod can produce axial compression deformation and rotation at the connecting plate, so the axial force generated by the prestressed cable will not be transmitted to the reinforced object or the support, and only the upward reaction force is transmitted to the reinforced object through the vertical support rod and the connecting plate, so as to improve the bearing capacity of the reinforced object and reduce the vertical deflection of the reinforced object.

Description

Technical Field

[0001] The present invention relates to the field of prestressed reinforcement, and in particular to a prestressed reinforcement structure and method. Background Art

[0002] Grid structures are a typical form of large-span spatial structure. They feature lightweight construction, excellent seismic resistance, robust spatial load-bearing properties, factory prefabrication, and superior safety performance. They are widely used in various buildings, including airport terminals, stadiums, and exhibition halls. However, some existing large-span grid structures fail to meet their load-bearing capacity requirements due to factors such as increased loads, changes in operational functions, corrosion, and component damage. Simply dismantling and rebuilding these structures would waste significant manpower and resources. However, reinforcing these structures can not only improve and enhance their safety, but also reduce the cost of demolition and reconstruction.

[0003] Common reinforcement methods for grid structures include steel plate bonding, casing reinforcement, FRP bonding, and prestressed reinforcement. Of the four commonly used reinforcement methods, steel plate bonding, casing reinforcement, and FRP bonding are all targeted at strengthening specific damaged members. For large-span grid structures, the number of members is large, and reinforcing each member individually would be extremely time-consuming and labor-intensive, and it would also be difficult to ensure that no member is missed. In contrast, prestressed reinforcement can effectively avoid the problems of the above three reinforcement methods.

[0004] Prestressed reinforcement method refers to the use of prestressed steel strands (or prestressed cables) to reinforce the reinforced system, thereby adjusting the internal forces and displacements of the structural members.

[0005] Patent publication number CN105442704A, filed by Zhejiang Jinggong Steel Structure Group Co., Ltd., and titled "A Reinforced Grid Structure and Construction Method for Reinforcing a Grid Structure," describes a technical solution that adds a prestressing system to the lower portion of the original steel grid structure under load. The prestressing system includes prestressed cables, cable anchoring nodes, struts, cable clamps, and connection nodes between the struts and the grid structure. The ends of the prestressed cables are secured to the lower supports of the grid structure via cable anchoring nodes. The cable anchoring nodes consist of supports fixed to concrete columns, lugs welded to the outside of the supports, and pins. The lower end of the strut is connected to the prestressed cable through a cable clamp. The cable clamp includes an upper clamping block and a lower clamping block. The upper clamping block and the lower clamping block are connected and tightened by countersunk bolts. The upper end face of the upper clamping block is fixedly connected to the lower end of the strut through a welded liner. The upper end of the strut is connected to the truss structure through a truss connection point. The truss connection point includes a cone head at the upper end of the strut and a truss bolt ball. The cone head and the bolt ball are fixedly connected by a bolt.

[0006] In the above-mentioned prior art, the two ends of the prestressed cables are fixedly connected to the lower support of the grid structure, the lower ends of the struts are connected to the prestressed cables via cable clamps, and the upper ends of the struts are connected to the original steel grid structure via grid connection points. This has the disadvantage that the axial force generated by the prestressed cables is transmitted to the original steel grid structure, significantly affecting the internal forces of the grid structure's internal components and resulting in a large number of components requiring additional reinforcement. The reason for this disadvantage is that when prestress is applied to the prestressed cables, the prestressed system can provide an upward reaction force to the original steel grid structure. However, under the action of the prestressed cables, the internal forces of the structural components will be redistributed. Since the two ends of the original steel grid structure are fixedly connected to the supports, the axial compression deformation is constrained, resulting in a large axial force, which causes the grid structure to transform from its original bending state to a compression bending state, adversely affecting the internal forces of the grid structure's internal components.

[0007] In addition to the above-mentioned large-span grid structures, steel structures and concrete structures also have the same problem. Summary of the Invention

[0008] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a prestressed reinforcement structure in which the axial force generated by the prestressed cables will not be transmitted to the reinforced object and will not have an adverse effect on the internal forces of the internal components of the reinforced object.

[0009] Another object of the present invention is to provide a prestressed reinforcement method, which can effectively solve the problem of the axial force generated by the prestressed cable being transmitted to the reinforced object in the existing prestressed reinforcement method of the reinforced object.

[0010] The purpose of the present invention is achieved through the following technical solutions:

[0011] A prestressed reinforcement structure includes a reinforced object, a prestressed string self-balancing structure disposed below the reinforced object, and a support; wherein the reinforced object includes a steel structure or a concrete structure; the reinforced object is supported on the support, and the prestressed string self-balancing structure is located below the reinforced object; the prestressed string self-balancing structure includes a plurality of connecting plates, a self-balancing pressure rod, a plurality of vertical struts, and prestressed cables;

[0012] The reinforced object is connected to the prestressed string self-balancing structure through a connecting plate, and the connecting plate transmits the upward reaction force provided by the prestressed string self-balancing structure to the reinforced object above; the connecting plate is provided with an upper circular hole and a lower circular hole, and the chord of the reinforced object passes through the upper circular holes of several connecting plates, and both ends are supported on supports; the self-balancing pressure rod passes through the lower circular holes of several connecting plates, and both ends are connected to the two ends of the prestressed cable and then supported on the supports; several connecting plates are respectively connected to the prestressed cable through the vertical support rods below.

[0013] A plurality of node balls are provided on the chord of the reinforced object, the node balls pass through the upper circular holes of the connecting plate, and the node balls are fixed to the upper circular holes of the connecting plate by welding.

[0014] A plurality of first stiffening plates are welded between the two side planes of the connecting plate and the node ball.

[0015] A polytetrafluoroethylene layer is filled between the lower circular hole of the connecting plate and the self-balancing pressure rod.

[0016] The lower end of the vertical support rod is connected to the prestressed cable through a cable clamp, and the upper end thereof is connected to the self-balancing pressure rod in a node structure with an in-plane hinge connection and an out-of-plane rigid connection.

[0017] The cable clamp comprises an upper solid hemisphere and a lower solid hemisphere, and the upper and lower solid hemispheres are connected and tightened by a first bolt; the prestressed cable passes smoothly through the cable clamp.

[0018] The upper end surface of the cable clamp is fixedly connected to the lower end of the vertical support rod through a welding liner.

[0019] The end of the prestressed cable is movably connected to the end of the self-balancing pressure rod through a first ear plate and a first pin shaft, and the end of the self-balancing pressure rod is connected to the support through a second ear plate and a second pin shaft.

[0020] The support is provided with a third ear plate matched with the second pin shaft, and a plurality of second stiffening plates are provided on the side surface of the third ear plate.

[0021] A rectangular opening is provided at the bottom of the connecting plate, which is welded to the first steel plate. The first steel plate is also connected to the fourth ear plate at the top of the vertical support rod, the second steel plate on the side of the vertical support rod, and the third pin shaft.

[0022] One end of the prestressed tensioned string self-balancing structure is hinged to the support, and the other end is slidingly hinged to the support.

[0023] The connecting plates are steel plates of equal thickness.

[0024] Another object of the present invention is achieved through the following technical solutions:

[0025] A prestressed reinforcement method comprises the following steps in sequence:

[0026] First, the self-balancing pressure rod is transported vertically to the installation position. The chord and node ball of the reinforced object pass through the upper circular hole of the connecting plate, and the node ball is welded to the upper circular hole of the connecting plate. The self-balancing pressure rod passes through the lower circular hole of the connecting plate. The hole diameter of the lower circular hole is slightly larger than the diameter of the self-balancing pressure rod. A polytetrafluoroethylene layer is filled between the lower circular hole and the self-balancing pressure rod. The axial compression deformation and rotation of the self-balancing pressure rod at the connecting plate are not constrained by the connecting plate.

[0027] Then install the vertical support rod in place, and the upper end of the vertical support rod and the self-balancing pressure rod adopt a node structure with an out-of-plane rigid connection and an in-plane hinge connection;

[0028] Then the prestressed cable is transported vertically to the installation location for installation. The prestressed cable is connected to the lower end of the vertical strut by a cable clamp. The cable clamp is divided into an upper clamping block and a lower clamping block. The outer surfaces of the upper and lower clamping blocks are arc surfaces, and a semicircular cable groove is opened in the middle. The upper clamping block and the lower clamping block are connected by bolts. The prestressed cable passes smoothly through the circular cable groove formed by the upper and lower clamping blocks. The vertical strut is fixedly connected to the cable clamp through a liner. The prestressed cable is connected to the first pin shaft of the self-balancing pressure rod through its first ear plate. Tensioning is performed at one or both ends of the cable.

[0029] One end of the entire prestressed string self-balancing structure is hinged to the support, and the other end is slidingly hinged to the support.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] (1) For the existing prestressed reinforcement technology of large-span grid structures, a prestressed system is added below the original steel grid structure. The two ends of the prestressed cables are fixedly connected to the supports, and the vertical struts are directly connected to the chords of the original steel grid structure. After the prestress is applied, the axial force generated by the prestressed cables cannot be released and will be transmitted to the original steel grid structure, causing adverse effects on the components of the original steel grid structure.

[0032] The reinforcement method proposed in the present invention connects the reinforced object (including the original steel grid structure as a large-span grid structure) with the prestressed tensioned self-balancing structure through a connecting plate. When prestress is applied to the prestressed tensioned self-balancing structure, since one end of the entire prestressed tensioned self-balancing structure is hinged to the support and the other end is slidingly hinged to the support, and the connecting plate partially releases the self-balancing pressure rod, the self-balancing pressure rod can produce axial compression deformation and rotation at the connecting plate. Therefore, the axial force generated by the prestressed cable will not be transmitted to the reinforced object, and will not even be transmitted to the support. Only the upward reaction force is transmitted to the reinforced object through the vertical support rod and the connecting plate (equivalent to unloading the reinforced object), thereby improving the bearing capacity of the reinforced object and reducing its vertical deflection.

[0033] (2) Safe and reliable, simple in structure, and easy to construct: The present invention connects the reinforced object with the prestressed chord self-balancing structure through a connecting plate at the chord of the reinforced object. During the reinforcement process, there is no need to unload the reinforced object. The reinforcement construction process is safe, reliable, convenient and fast.

[0034] (3) Reasonable force: The upward reaction force generated by the prestressed tensioned self-balancing structure in the present invention is transmitted to the reinforced object through the connecting plate, which can effectively improve the bearing capacity of the reinforced object and reduce the vertical deflection of the structure. The connecting plate constrains the self-balancing pressure rod while not restricting the axial compression deformation and rotation of the self-balancing pressure rod at the connecting plate. The overall structure has a clear force transmission path and reasonable force. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural schematic diagram of a prestressed reinforcement structure described in the present invention.

[0036] Figure 2 Schematic diagram of the structure of the connecting plate of the present invention.

[0037] Figure 3 This is a schematic diagram of the structure of the connection between the connecting plate and the truss chord, self-balancing pressure rod and vertical strut according to the present invention. The perspective of this figure is the cross section of the truss chord.

[0038] Figure 4 This is a schematic structural diagram of the connection between the vertical brace, steel plate and ear plate according to the present invention. The perspective of this figure is the cross section of the vertical brace.

[0039] Figure 5 This is a schematic diagram of the structure of the connection between the connecting plate and the truss chord, self-balancing pressure rod and vertical strut according to the present invention. The perspective of this figure is the axial direction of the truss chord.

[0040] Figure 6 This is a structural diagram of the connection between the vertical struts and the prestressed cables according to the present invention, and the perspective of this figure is the axial direction of the prestressed cables.

[0041] Figure 7 This is a schematic structural diagram of the connection between the vertical struts and the prestressed cables according to the present invention, and the perspective of this figure is the cross-section of the prestressed cables.

[0042] Figure 8 This is a schematic structural diagram of the connection between the self-balancing pressure rod and the prestressed cable according to the present invention.

[0043] Figure 9 This is a schematic structural diagram of the end portion of the prestressed cable according to the present invention.

[0044] Figure 10 This is a schematic diagram of the support structure on one side.

[0045] Figure 11 Schematic diagram of the support structure on the opposite side.

[0046] The meanings of the reference numerals are as follows:

[0047] Reinforced object 1, prestressed tensioned self-balancing structure 2, support 3, vertical strut 4, prestressed cable 5, connecting plate 6, left plate 601, right plate 602, self-balancing pressure rod 7, chord 8, first ear plate 901, second ear plate 902, third ear plate 903, fourth ear plate 904, first pin 1001, second pin 1002, third pin 1003, cable clamp 11, upper clamping block 1101, lower clamping block 1102, first stiffening plate 1201, second stiffening plate 1202, first bolt 1301, second bolt 1302, node ball 14, weld 15, polytetrafluoroethylene layer 16, first steel plate 1701, second steel plate 1702, perforated steel plate 18, liner 19, support base plate 20, limiting steel plate 21, etc. DETAILED DESCRIPTION

[0048] The present invention will be described in further detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0049] like Figures 1 to 10 A prestressed reinforcement structure includes a reinforced object, a prestressed string self-balancing structure located below the reinforced object, and a support; wherein the reinforced object includes a steel structure and a concrete structure; the reinforced object is supported on the support, and the prestressed string self-balancing structure is located below the reinforced object. The prestressed string self-balancing structure includes a connecting plate, a self-balancing pressure rod, a vertical strut, and a prestressed cable; the connecting plate is a steel plate of equal thickness with two upper and lower circular holes. The function of the connecting plate is to connect the reinforced object with the prestressed string self-balancing structure and to transmit the upward reaction force provided by the prestressed string self-balancing structure to the reinforced object above; the self-balancing pressure rod passes through the lower circular hole of the connecting plate and can produce axial compression deformation under the action of the prestressed cable, but it is also constrained by the connecting plate and will not produce overall out-of-plane instability.

[0050] The vertical strut is arranged perpendicular to the ground, and serves to connect the prestressed cable and the self-balancing pressure rod; the prestressed cable is connected to the first pin shaft of the self-balancing pressure rod through its first ear plate, and is simply supported on the supports on both sides; the lower end of the vertical strut is connected to the prestressed cable through a cable clamp, and the upper end and the self-balancing pressure rod adopt a node structure with in-plane hinge and out-of-plane rigid connection; the cable clamp includes an upper solid hemisphere and a lower solid hemisphere, and the two solid hemispheres are connected and tightened by a first bolt; the prestressed cable passes smoothly through the cable clamp.

[0051] like Figure 1The prestressed reinforcement structure includes a reinforced object 1, a prestressed string self-balancing structure 2, and a support 3. The reinforced object 1 is supported on the support 3, which is shared by the reinforced object 1. The prestressed string self-balancing structure 2 is located below the reinforced object 1 and is connected to the reinforced object 1 via a connecting plate 6. The prestressed string self-balancing structure 2 includes vertical struts 4, prestressed cables 5, a connecting plate 6, and a self-balancing pressure rod 7. The vertical struts 4 connect the prestressed cables 5 and the self-balancing pressure rod 7.

[0052] like Figures 2 to 5 The connecting plate 6 is a steel plate of equal thickness with two circular holes at the top and bottom and a rectangular opening at the bottom. It is divided into a left plate 601 and a right plate 602. The left plate 601 and the right plate 602 are connected by welding to form a whole. The weld 15 formed is as shown in FIG. Figure 2 As shown. The chord 8 and node ball 14 of the reinforced object 1 pass through the upper circular hole of the connecting plate 6. The upper circular hole of the connecting plate 6 and the node ball 14 are welded to the upper circular hole of the connecting plate 6. A first stiffening plate 1201 is welded between the two side planes of the connecting plate 6 and the node ball 14 to prevent the connecting plate 6 from experiencing out-of-plane instability. The self-balancing pressure rod 5 passes through the lower circular hole of the connecting plate 6. The diameter of the lower circular hole of the connecting plate 6 is slightly larger than the diameter of the self-balancing pressure rod 5. A polytetrafluoroethylene layer 16 is filled between the lower circular hole of the connecting plate 6 and the self-balancing pressure rod 5 to ensure that the axial compression deformation of the self-balancing pressure rod 5 is not constrained by the connecting plate. The first steel plate 1701 passes through the rectangular opening at the bottom of the connecting plate 6 and is welded to the connecting plate 6. The perforated steel plate 18 is welded to the vertical strut 4 at one end where the vertical strut 4 is connected to the first steel plate 1701. The second steel plate 1702 is welded to the side of the perforated steel plate 18. The vertical strut 4 is connected to the first steel plate 1701 through its fourth ear plate 904, the second steel plate 1702 and the third pin shaft 1003.

[0053] like Figure 6 、 7 The lower end of the vertical strut 4 is connected to the prestressed cable 5 via a cable clamp 11. The cable clamp 11 consists of an upper clamping block 1101 and a lower clamping block 1102. The upper and lower clamping blocks 1101 and 1102 are connected and tightened by a first bolt 1301. Semicircular cable grooves are defined in the middle of each clamping block 1101 and 1102, allowing the prestressed cable 5 to smoothly pass through the circular grooves formed by the connection between the upper and lower clamping blocks 1101 and 1102. The upper end surface of the upper clamping block 1101 is fixedly connected to the lower end of the vertical strut 4 via a welded liner 19.

[0054] like Figure 8 、 9 A second ear plate 902 is welded to the end of the self-balancing pressure rod 7, and the end of the self-balancing pressure rod is connected to the support through the second ear plate 902 and the second pin shaft 1002.

[0055] The prestressed cable 5 is connected to the first pin 1001 of the self-balancing pressure rod 7 through its first ear plate 901 and is simply supported on the supports 3 on both sides.

[0056] like Figure 10 、 11 The entire prestressed tensioned self-balancing structure 2 is hinged to the support 301 at one end and slidably hinged to the support 302 at the other end. The hinged end at the support is achieved by a fixed hinge support, which includes a support base plate 20, a third lug plate 903, a second stiffening plate 1202, and a second bolt 1302. The support base plate 20 is fixed to the support 301 by the second bolt 1302, and the third lug plate 903 is welded to the support base plate 20. The second stiffening plate 1202 is welded to one surface of the third lug plate 903. The sliding hinge at the support is achieved by a sliding hinge support. Based on the fixed hinge support, the sliding hinge support also adds a stainless steel plate and a polytetrafluoroethylene plate inside the limiting steel plate 21 to ensure that the support base plate 20 can slide freely along the axial direction of the self-balancing pressure rod 7.

[0057] During installation, the self-balancing pressure rod 7 is first transported vertically to the installation position. The chord 8 and the node ball 14 are passed through the upper circular hole of the connecting plate 6. The connecting plate 6 and the node ball 14 are welded and fixed to the upper circular hole of the connecting plate 6. The self-balancing pressure rod 7 is passed through the lower circular hole of the connecting plate 6. The aperture of the lower circular hole is slightly larger than the diameter of the self-balancing pressure rod 7. A polytetrafluoroethylene layer is filled between the lower circular hole and the self-balancing pressure rod 7. The axial compression deformation and rotation of the self-balancing pressure rod 7 at the connecting plate are not constrained by the connecting plate. The second step is to install the vertical support rod 4 in place. The upper end of the vertical support rod 4 and the self-balancing pressure rod 7 adopt a node structure with an out-of-plane rigid connection and an in-plane hinge. In the third step, the prestressed cable 5 is transported vertically to the installation position for installation. The prestressed cable 5 is connected to the lower end of the vertical strut 4 through a cable clamp 11. The cable clamp 11 is divided into an upper clamping block 1101 and a lower clamping block 1102. The outer surface of the clamping block is an arc surface, and a semicircular cable groove is opened in the middle. The upper clamping block 1101 and the lower clamping block 1102 are connected by a first bolt 1301. The prestressed cable 5 passes smoothly through the circular cable groove formed by the upper clamping block 1101 and the lower clamping block 1102. The vertical strut 4 is fixedly connected to the cable clamp 11 through a liner 19; the prestressed cable 5 is connected to the first pin shaft 10 of the self-balancing pressure rod 7 through its first ear plate 9; tensioning is performed at one end or both ends of the cable; one end of the entire prestressed tensioned self-balancing structure 2 is hinged to the support, and the other end is slidingly hinged to the support.

[0058] When prestress is applied to the prestressed cable 5, the self-balancing pressure rod 7 will generate a large axial force due to the action of the prestressed cable 5. Since the connection plate 6 and the self-balancing pressure rod 7 are partially released, and one end of the entire prestressed tensioned self-balancing structure 2 is hinged to the support and the other end is slidingly hinged to the support, the self-balancing pressure rod 7 can undergo axial compression deformation and rotation at the connection plate. The connection plate 6 plays a lateral support role for the self-balancing pressure rod 7. The self-balancing pressure rod 7 will not produce out-of-plane instability during the axial compression deformation process. Under the action of the prestressed cable 5, the self-balancing pressure rod 7 undergoes axial compression deformation while the vertical strut 4 generates an upward reaction force and transmits the upward reaction force to the upper reinforced object 1 through the connection plate 6, thereby improving the load-bearing capacity of the reinforced object 1, reducing its deflection, and reinforcing the reinforced object 1.

[0059] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A prestressed reinforcement structure, characterized in that: The invention comprises a reinforced object (1), a prestressed string self-balancing structure (2) arranged below the reinforced object (1), and a support (3); wherein the reinforced object (1) comprises a steel structure and a concrete structure; the reinforced object (1) is supported on the support (3), and the prestressed string self-balancing structure (2) is located below the reinforced object (1); the prestressed string self-balancing structure (2) comprises a plurality of connecting plates (6), a self-balancing pressure rod (7), a plurality of vertical struts (4), and a prestressed cable (5); The reinforced object (1) is connected to the prestressed chord self-balancing structure (2) via a connecting plate (6), and the connecting plate (6) transmits the upward reaction force provided by the prestressed chord self-balancing structure (2) to the reinforced object (1) above; the connecting plate (6) is provided with an upper circular hole and a lower circular hole, and the chord rod (8) of the reinforced object (1) passes through the upper circular holes of several connecting plates (6), and its two ends are supported on the support (3); the self-balancing pressure rod (7) passes through the lower circular holes of several connecting plates (6), and its two ends are respectively connected to the two ends of the prestressed cable (5) and then supported on the support (3); several connecting plates (6) are respectively connected to the prestressed cable (5) through the vertical support rods (4) below.

2. The prestressed reinforcement structure according to claim 1, characterized in that: A plurality of node balls (14) are provided on the chord rod (8) of the reinforced object (1), and the node balls (14) pass through the upper circular holes of the connecting plate (6). The node balls (14) are fixed to the upper circular holes of the connecting plate (6) by welding.

3. The prestressed reinforcement structure according to claim 1, characterized in that: A polytetrafluoroethylene layer (16) is filled between the lower circular hole of the connecting plate (6) and the self-balancing pressure rod (7).

4. The prestressed reinforcement structure according to claim 1, characterized in that: The lower end of the vertical support rod (4) is connected to the prestressed cable (5) via a cable clamp (11), and the upper end thereof and the self-balancing pressure rod (7) adopt a node structure form of in-plane hinge connection and out-plane rigid connection.

5. The prestressed reinforcement structure according to claim 4, characterized in that: The cable clamp (11) comprises an upper solid hemisphere and a lower solid hemisphere, and the upper and lower solid hemispheres are connected and tightened by a first bolt (1301); the prestressed cable (5) passes smoothly through the cable clamp (11).

6. The prestressed reinforcement structure according to claim 4, characterized in that: The upper end surface of the cable clamp (11) is fixedly connected to the lower end of the vertical support rod (4) through a welding liner (19).

7. The prestressed reinforcement structure according to claim 1, characterized in that: The end of the prestressed cable (5) is movably connected to the end of the self-balancing pressure rod (7) through a first ear plate (901) and a first pin shaft (1001), and the end of the self-balancing pressure rod (7) is connected to the support (3) through a second ear plate (902) and a second pin shaft (1002); The support (3) is provided with a third ear plate (903) that cooperates with the second pin shaft (1002), and a plurality of second stiffening plates (1202) are provided on the side surface of the third ear plate (903).

8. The prestressed reinforcement structure according to claim 1, characterized in that: The connecting plate (6) has a rectangular opening at the bottom, which is welded to the first steel plate (1701). The perforated steel plate (18) is welded to the vertical support rod (4) at one end where the vertical support rod (4) is connected to the first steel plate (1701). The side of the perforated steel plate (18) is welded to the second steel plate (1702). The vertical support rod (4) is connected to the first steel plate (1701) through its fourth ear plate (904), the second steel plate (1702) and the third pin shaft (1003).

9. The prestressed reinforcement structure according to claim 1, characterized in that: One end of the prestressed string self-balancing structure (2) is hinged to the support (301), and the other end is slidingly hinged to the support (302).

10. A prestressed reinforcement method, characterized in that: Contains the following steps in the following order: First, the self-balancing pressure rod (7) is vertically transported to the installation position, the chord (8) and the node ball (14) of the reinforced object (1) pass through the upper circular hole of the connecting plate (6), and the node ball (14) is welded and fixed to the upper circular hole of the connecting plate (6), the self-balancing pressure rod (7) passes through the lower circular hole of the connecting plate (6), the aperture of the lower circular hole is slightly larger than the diameter of the self-balancing pressure rod (7), and a polytetrafluoroethylene layer (16) is filled between the lower circular hole and the self-balancing pressure rod (7), so that the axial compression deformation and rotation of the self-balancing pressure rod (7) at the connecting plate (6) are not constrained by the connecting plate (6); Then the vertical support rod (4) is installed in place, and the upper end of the vertical support rod (4) and the self-balancing pressure rod (7) adopt a node structure form of out-of-plane rigid connection and in-plane hinge connection; Then the prestressed cable (5) is transported vertically to the installation position for installation. The prestressed cable (5) is connected to the lower end of the vertical support rod (4) through a cable clamp (11). The cable clamp (11) is divided into an upper clamping block (1101) and a lower clamping block (1102). The outer surfaces of the upper and lower clamping blocks (1102) are both arc surfaces, and a semicircular cable groove is opened in the middle; the upper clamping block (1101) and the lower clamping block (1102) are connected by a first bolt (1301). The prestressed cable (5) passes smoothly through the circular cable groove formed by the upper clamping block (1101) and the lower clamping block (1102). The vertical support rod (4) is fixedly connected to the cable clamp (11) through a liner (19); the prestressed cable (5) is connected to the first pin shaft (1001) of the self-balancing pressure rod (7) through its first ear plate (901); tensioning is performed at one end or both ends of the cable; One end of the entire prestressed string self-balancing structure (2) is hinged to the support (301), and the other end is slidingly hinged to the support (302).

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