A reinforcement device and method for wooden beams in historical buildings

Abstract

This invention discloses a reinforcement device and method for wooden beams in historical buildings, comprising: two pairs of end plates, respectively arranged at both ends of the wooden beam and symmetrically positioned on the front and rear sides of the beam, forming a close-fitting embrace around the ends of the beam; each end plate has an upper connection point at its top near the center of the beam on both its front and rear sides, and a lower connection point at its bottom extending below the beam, located in the same vertical direction as the upper connection point; FRP composite fabric for securing the end plates to the beam; and a truss structure, fixedly arranged between the two pairs of end plates and located on the outside of the beam, for reinforcing the beam, the truss structure comprising: two sets of upper chords, a lower chord assembly, and multiple sets of web members. This invention enhances the local bearing capacity and shear resistance of the vulnerable areas at the ends of the wooden beam, and the tensioned lower chord can suppress crack propagation in the tension zone at the lower edge of the beam, preventing brittle fracture and achieving a completely reversible and detachable reinforcement scheme.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and more specifically to a device and method for reinforcing wooden beams in historical buildings. Background Technology

[0002] Most of the modern historical buildings preserved in my country today are brick-and-wood structures. In these buildings, compared to the lattice-structured wooden roof trusses, the floor beams have a lower safety margin due to their large spans and heavy loads, making them prone to brittle failure. Therefore, they are often one of the key areas of focus for the reinforcement and restoration of historical buildings.

[0003] In fact, due to long-term load-bearing, natural disasters, or wood diseases and decay, the wooden beams of historical buildings often suffer from material degradation, leading to reduced load-bearing capacity, increased deformation, and damage to vulnerable areas at the ends. This makes it even more difficult to meet current load-bearing requirements for timber structures, thus necessitating reinforcement of the floor beams. Currently, traditional reinforcement methods for wooden beams typically involve bonding steel or carbon fiber cloth to the surface. This adhesive-based method damages the original structure, is irreversible, and covers most of the beam's surface, obscuring its original state. Another method involves gluing or nailing timber to the beams to increase the cross-section, but this method lacks the identifiability required for the restoration and preservation of historical buildings, hindering the development and inheritance of historical buildings with cultural value.

[0004] Overall, the above-mentioned reinforcement methods cannot meet the requirements of authenticity (not damaging the wooden beams), reversibility (the reinforcement device can be removed to restore the original state of the wooden beams), and identifiability required for the protection of historical buildings. In view of this, it is necessary to propose a new wooden beam reinforcement device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to disclose a reinforcement device and method for wooden beams in historical buildings. This device and method enhance the local bearing capacity and shear protection of vulnerable areas at the ends of wooden beams. The tensioned lower chord can suppress the crack propagation in the tension zone at the lower edge of the wooden beam, avoiding brittle fracture failure. This not only effectively improves the load-bearing capacity of the wooden beam, but also makes the reinforcement scheme completely reversible and detachable, meeting the requirements of minimal intervention and reversibility for the reinforcement of historical buildings.

[0006] To achieve the above objectives, the present invention provides a reinforcement device for wooden beams of historical buildings, comprising:

[0007] Two pairs of end plates are respectively arranged at both ends of the wooden beam and symmetrically arranged on the front and rear sides of the wooden beam, forming a close-fitting embrace around the ends of the wooden beam; the front and rear sides of the end plates are provided with upper connection points at the top of the end closest to the center of the wooden beam, and the bottom end of the end plates extends to the bottom of the wooden beam and is provided with lower connection points in the same vertical direction as the upper connection points.

[0008] FRP composite fabric is used to clamp the end plate to the wooden beam and form a fixed and reliable connection through structural adhesive;

[0009] A truss structure, fixedly arranged between the two pairs of end plates and located on the outside of the wooden beam, is used to reinforce the wooden beam and suppress crack propagation in the tension zone at the lower edge of the wooden beam. The truss structure includes:

[0010] Two sets of upper chord members are arranged on the front and rear sides of the wooden beam, respectively, and both are connected to the two upper connection points of the end plate on the same side of the wooden beam through node plates provided at the ends;

[0011] The lower chord assembly is located directly below the wooden beam, and each end is equipped with an anchor rod for connecting the two lower connection points of the same end plate of the wooden beam. The lower chord assembly can provide the tension force required for the reinforcement of the wooden beam.

[0012] Multiple sets of web members are used to fix and connect the upper chord and the lower chord assembly.

[0013] As a further improvement of the present invention, the lower string assembly includes:

[0014] The flexible bottom chord is positioned directly below the wooden beam, with both ends fixedly connected to anchor rods.

[0015] Multiple sets of adjusting rods are arranged parallel to each other along the length of the flexible lower chord and are distributed axially perpendicular to the flexible lower chord. The two ends of the adjusting rods are rotating adjustment ends, and a clamping gap is formed in the center for the flexible lower chord to pass through.

[0016] By rotating the adjusting rod, the flexible lower chord can be wound around the outer circumference of the adjusting rod to change the tension of the lower chord assembly on the bottom of the wood.

[0017] One end of each set of web members is fixedly connected to the upper chord assembly, and the other end is provided with a positioning plate for the adjusting round rod to pass through and form a rotatable connection.

[0018] A locking structure is also provided between the positioning plate and the adjusting rod to lock and fix the adjusting rod after it is rotated.

[0019] As a further improvement of the present invention, it also includes multiple sets of gusset plates, which are arranged parallel to each other at intervals along a direction perpendicular to the upper chord and are fixedly connected between the two sets of upper chords.

[0020] As a further improvement of the present invention, the lower chord assembly further includes:

[0021] Multiple sets of pads are respectively placed between the two ends of the adjusting rod and the wooden beam to keep the wooden beam in contact with the lower chord assembly, so as to ensure that the wooden beam and the truss can work together when bearing deformation.

[0022] As a further improvement of the present invention, the outer wall of the rotating adjustment end is provided with an external thread, and the locking structure includes:

[0023] Rotate the handwheel to move the rotating adjustment end that is fitted onto the adjusting rod, and achieve positioning engagement with the adjusting rod through the protrusion and slot structure;

[0024] A limiting member is fixed to the side of the positioning plate facing the rotating handwheel and has a limiting groove for accommodating the rotating handwheel, used for circumferential positioning of the rotating handwheel;

[0025] The positioning nut engages with the threaded end of the rotating adjustment to axially limit the rotating handwheel and prevent it from disengaging from the limiting groove.

[0026] As a further improvement of the present invention, the flexible lower chord is a steel strip or multiple parallel steel wire ropes or cables.

[0027] As a further improvement of the present invention, the upper connection point is a threaded rod structure and the lower connection point is a through hole structure.

[0028] As a further improvement of the present invention, the clamping gap in the center of the adjusting rod is formed by two parallel cylindrical rods spaced apart, the rotating adjusting rod is a cylindrical rod structure, and the sum of the diameters of the two cylindrical rods is less than the diameter of the rotating adjusting end.

[0029] As a further improvement of the present invention, the flexible lower chord and the anchor rod are detachably connected.

[0030] This invention also discloses a reinforcement method for a reinforcement device used for wooden beams in historical buildings, comprising the following steps:

[0031] S1, four end plates are placed at both ends of the wooden beam to form a closed body. FRP composite fabric is used to tighten the end plates to the wooden beam, and a reliable connection is formed by structural adhesive.

[0032] S2, Anchor rods are installed between the lower connection points of the two end plates at the same end of the wooden beam and fixed with nuts. A flexible lower chord is installed between the two anchor rods, and multiple sets of adjusting round rods are arranged at intervals on the flexible lower chord.

[0033] S3, weld node plates to both ends of the upper chord, and fix them to the upper connection point of the end plate by using the openings on the node plates; and bond multiple sets of lacing plates between the two sets of upper chords.

[0034] S4, Install multiple sets of web members, one end of which is welded and fixed to the upper chord, and the other end is welded with a positioning plate, using the opening on the positioning plate for the end of the adjusting round rod to pass through;

[0035] S5, a locking structure is installed between the adjusting rod and the positioning plate, and a pad is placed between the adjusting rod and the wooden beam. By rotating the adjusting rod, the flexible lower chord is changed from a relaxed state to a tensile state, providing the wooden beam with the required tension. Finally, the adjusting rod is locked and fixed by the locking structure to maintain the tension and locking state of the lower chord assembly, forming an effective truss structure system and completing the reinforcement of the wooden beam.

[0036] Compared with the prior art, the beneficial effects of the present invention are:

[0037] (1) A reinforcement device for wooden beams of historical buildings, comprising end plates, FRP composite materials and truss structure, wherein the truss structure is connected to the wooden beam to form an integral whole by setting end plates, so as to transfer the load borne by the wooden beam to the truss structure, thereby strengthening the current bearing capacity of the wooden beam and achieving the goal of fully reversible wooden beam reinforcement; the end plates, which surround the wooden beam on three sides, enhance the local bearing pressure and shear protection of the vulnerable area at the end of the wooden beam; the truss structure includes an upper chord, a flexible lower chord, an adjusting round rod and web members, wherein the flexible lower chord is changed from a relaxed state to a tensioned state by rotating the adjusting round rod, providing the required tension force to the wooden beam, suppressing the crack propagation in the tension zone at the lower edge of the wooden beam, thereby achieving the reinforcement of the wooden beam and providing a second line of defense against brittle fracture failure of the wooden beam; by placing pads between the two ends of the adjusting round rod and the wooden beam, the lower chord assembly is kept in contact with the wooden beam to ensure that the wooden beam and the truss can work together when bearing deformation.

[0038] (2) The reinforcement device of the present invention can be designed and manufactured according to the size, damage and bearing capacity requirements of the wooden beam. At the same time, the prestress adjustment scheme can be selected according to the actual situation. The flexible lower chord includes steel plate strip or multiple parallel steel wire ropes or cables, which ensures the universality and diversity of the wooden beam reinforcement method provided by the present invention, as well as the controllability of the prestress application.

[0039] (3) The end plate of the present invention uses FRP composite fabric and structural adhesive bonding technology between the end plate and the end of the wooden beam. The truss structure and the end plate are detachable, so as to ensure the complete reversibility and detachability of the reinforcement device. At the same time, the reinforcement method does not involve damaging the wooden beam of the historical building, which not only protects the authenticity of the original state of the wooden beam, but also shows the identifiability necessary for the restoration of historical buildings.

[0040] (4) The wooden beam reinforcement method provided by the present invention uses end plates and FRP composite fabric to construct stable connection points for the reinforcement device at both ends of the wooden beam. Then, the upper chord, lower chord assembly and web members are arranged between the end plates at both ends of the wooden beam. When the flexible lower chord is in the relaxed stage, the adjusting rod can slide left and right along the flexible lower chord or drive the flexible lower chord to move up and down, so as to facilitate the alignment and installation of the web members and the lower chord assembly. After the wooden beam reinforcement device is assembled, the flexible lower chord is changed from a relaxed state to a tensile state by rotating the adjusting rod, so as to provide the required tension force for the wooden beam. Finally, the adjusting rod is locked and fixed by the locking structure to maintain the tension and locking state of the lower chord assembly, forming an effective truss structure system and completing the wooden beam reinforcement. The above reinforcement method is highly flexible and can flexibly adjust the tension force of the flexible lower chord according to the state of the wooden beam without damaging the wooden beam itself. At the same time, its reinforcement scheme is completely reversible and the detachable connection reinforcement scheme avoids brittle fracture of the wooden beam, providing important technical support for the long-term preservation and inheritance of cultural relics and buildings. Attached Figure Description

[0041] Figure 1 This is a three-dimensional structural schematic diagram of a reinforcement device for wooden beams of historical buildings according to the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of the middle plate of a reinforcement device for wooden beams of historical buildings according to the present invention;

[0043] Figure 3 This is a schematic diagram showing the installation position of the end plate and the wooden beam in a reinforcement device for wooden beams of historical buildings according to the present invention.

[0044] Figure 4 This is a schematic diagram of the fixing of the end plate to the wooden beam in a reinforcement device for wooden beams of historical buildings according to the present invention, which also shows the anchor rod;

[0045] Figure 5 This is a schematic diagram of the assembly of the adjusting round rod and the flexible lower chord in a reinforcement device for wooden beams of historical buildings according to the present invention. The diagram also shows the connection method between the flexible lower chord and the anchor rod.

[0046] Figure 6 This is a schematic diagram showing the installation position of the pad in a reinforcement device for wooden beams of historical buildings according to the present invention;

[0047] Figure 7 This is a schematic diagram of the rotating handwheel in a reinforcement device for wooden beams of historical buildings according to the present invention;

[0048] Figure 8 This is a schematic diagram of the adjusting rod in a reinforcement device for wooden beams of historical buildings according to the present invention;

[0049] Figure 9 Schematic diagram of the flexible lower chord tension adjustment method in a reinforcement device and method for historical building wooden beams according to the present invention. In the figure, (a) is a schematic diagram of the alignment installation of the rotating handwheel and the adjusting round rod, (b) is a schematic diagram of the rotation of the rotating handwheel, (c) is a schematic diagram of the rotating handwheel being pushed into the limiting groove, and (d) is a schematic diagram of the nut fixing the rotating handwheel.

[0050] In the figure: 1. End plate member; 101. Upper connection point; 102. Lower connection point; 2. FRP composite material; 3. Anchor rod; 4. Flexible lower chord; 5. Adjusting round rod; 501. Cylindrical rod; 502. Rotating adjustment end; 503. Card slot; 601. Upper chord rod; 602. Web member; 603. Gusset plate; 604. Positioning plate; 7. Lacing plate; 8. Rotating handwheel; 801. Protrusion; 9. Cushion block; 10. Nut. Specific embodiments

[0051] The present invention will be described in detail below with reference to the various embodiments shown in the drawings. It should be noted, however, that these embodiments are not limitations of the present invention, and any equivalent transformation or substitution in terms of function, method, or structure made by those of ordinary skill in the art based on these embodiments shall fall within the protection scope of the present invention.

[0052] Please refer Figures 1 to 9 to a specific embodiment of a reinforcement device and method for historical building wooden beams according to the present invention shown.

[0053] Refer Figure 1-3 As shown, in this embodiment, a reinforcement device for historical building wooden beams includes end plate members, FRP composite fabrics, and a truss structure. Among them, there are two pairs of end plate members, which are respectively arranged at both ends of the wooden beam, and each pair of two end plate members are symmetrically arranged on the front and back sides of the wooden beam, and form a fitting and surrounding of the end of the wooden beam; upper connection points are provided at the top of the front and back sides of the end plate members near one end of the center of the wooden beam, and the bottom end of the end plate member extends to the lower part of the wooden beam and is provided with a lower connection point located in the same vertical direction as the upper connection point; the upper connection point is a threaded rod structure, and the lower connection point is a through-hole structure. The FRP composite fabric is used to tighten the end plate member and the wooden beam, and a fixed and reliable connection is formed through structural adhesive;

[0054] Specifically, the truss structure is fixedly arranged between two pairs of end plate members and is located outside the wooden beam for strengthening the wooden beam and suppressing the crack development in the tension zone at the lower edge of the wooden beam. The truss structure includes: an upper chord, a lower chord assembly, and web members. Among them, there are two groups of upper chords, which are respectively arranged on the front and rear sides of the wooden beam, and are both connected to two upper connection points of the end plate member on the same side of the wooden beam through gusset plates provided at the ends; the lower chord assembly is arranged directly below the wooden beam, and bolts are provided at both ends for penetrating and connecting two lower connection points of the end plate member at the same end of the wooden beam. The lower chord assembly can provide the tension force required for strengthening the wooden beam; multiple groups of web members are all used to fixedly connect the upper chord and the lower chord assembly.

[0055] Specifically, referring Figure 4-5 As shown, in this embodiment, the lower chord assembly includes a flexible lower chord and an adjusting round bar. Among them, the flexible lower chord is arranged directly below the wooden beam, and both ends are fixedly connected to the bolts respectively. Specifically, the connection between the flexible lower chord and the bolts is detachable; multiple groups of adjusting round bars are arranged parallel and spaced along the length direction of the flexible lower chord, and the axial direction is perpendicular to the flexible lower chord. Both ends of the adjusting round bar are rotation adjustment ends, and a clamping gap for the flexible lower chord to penetrate is formed in the center; specifically, referring Figure 8 As shown, the clamping gap in the center of the adjusting round bar is formed by two parallel and spaced cylindrical rods. The rotation adjustment rod is a round bar structure, and the sum of the diameters of the two cylindrical rods is smaller than the diameter of the rotation adjustment end. By rotating the adjusting round bar, the flexible lower chord can be wound around the outer periphery of the adjusting round bar to change the tension of the lower chord assembly on the bottom of the wood; one end of each group of web members is fixedly connected to the upper chord assembly, and a positioning plate is provided at the other end for the adjusting round bar to penetrate and form a rotational connection;

[0056] Referring Figure 6-7 As shown, in this embodiment, a locking structure is further provided between the positioning plate and the adjusting round bar for locking and fixing the adjusting round bar after rotation. The reinforcement device of the present application further includes multiple groups of batten plates, which are arranged parallel and spaced along the direction perpendicular to the upper chord and are fixedly connected between the two groups of upper chords. Referring Figure 6 As shown, the lower chord assembly further includes multiple groups of pads, which are respectively padded between the two ends of the adjusting round bar and the wooden beam to keep the wooden beam in contact with the lower chord assembly, so as to ensure the coordinated action of the wooden beam and the truss when bearing deformation. The pads are arranged at equal intervals above the adjusting round bar and are also set according to the damage condition of the wooden beam.

[0057] Specifically, in the present application, an external thread is provided on the outer wall of the rotation adjustment end. The locking structure includes a rotation handwheel, a limiting member, and a positioning nut; among them, the rotation handwheel is movably sleeved on the rotation adjustment end of the adjusting round bar, and the positioning fit with the adjusting round bar is realized through a convex block and a slot structure; referring Figure 9As shown, in this embodiment, the adjusting rod has an axial groove, and the rotating handwheel has a protrusion that mates with the groove, forming a circumferential fixed connection and a circumferential sliding connection between the rotating handwheel and the adjusting rod. Specifically, the groove is a T-shaped groove, and the protrusion is a T-shaped solid. A limiting member is fixed to the side of the positioning plate facing the rotating handwheel and forms a limiting groove for accommodating the rotating handwheel, used for circumferential positioning of the rotating handwheel. The positioning nut is threadedly engaged with the rotating adjusting end to axially limit the rotating handwheel and prevent it from disengaging from the limiting groove. Furthermore, the number of rotating handwheels and rotations to be controlled can be selected according to the actual situation, ensuring that the rotating handwheels on both sides of the wooden beam rotate simultaneously.

[0058] It should be understood that the prestressing adjustment scheme can be selected according to the actual situation, and the flexible lower chord is a steel plate strip or multiple parallel steel wire ropes or cables. In this embodiment, the flexible lower chord is a steel plate strip.

[0059] This invention also discloses a reinforcement method for a reinforcement device for wooden beams in historical buildings, comprising the following steps: S1, arranging four end plates at both ends of the wooden beam to form a truncated body, using FRP composite fabric to tighten the end plates to the wooden beam, and forming a reliable connection through structural adhesive; S2, installing anchor rods between the lower connection points of two end plates at the same end of the wooden beam and fixing them with nuts, installing a flexible lower chord between the two anchor rods, and arranging multiple sets of adjusting round rods at intervals on the flexible lower chord; S3, welding node plates to both ends of the upper chord, and using the openings on the node plates to fix them to the upper connection points of the end plates. Multiple sets of gusset plates are bonded between the two sets of upper chord members; S4, multiple sets of web members are installed, with one end of the web member welded to the upper chord member and the other end welded with a positioning plate, using the opening on the positioning plate for the end of the adjusting round rod to pass through; S5, a locking structure is installed between the adjusting round rod and the positioning plate, and a pad is placed between the adjusting round rod and the wooden beam. By rotating the adjusting round rod, the flexible lower chord is changed from a relaxed state to a tensile state, providing the required tension force to the wooden beam. Finally, the adjusting round rod is locked and fixed by the locking structure to maintain the tension and locking state of the lower chord assembly, forming an effective truss structure system and completing the reinforcement of the wooden beam.

[0060] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A reinforcement device for wooden beams in historical buildings, characterized in that, include: Two pairs of end plates are respectively arranged at both ends of the wooden beam and symmetrically arranged on the front and rear sides of the wooden beam, forming a close-fitting embrace around the ends of the wooden beam; the front and rear sides of the end plates are provided with upper connection points at the top of the end closest to the center of the wooden beam, and the bottom end of the end plates extends to the bottom of the wooden beam and is provided with lower connection points in the same vertical direction as the upper connection points. FRP composite fabric is used to clamp the end plate to the wooden beam and form a fixed and reliable connection through structural adhesive; A truss structure, fixedly arranged between the two pairs of end plates and located on the outside of the wooden beam, is used to reinforce the wooden beam and suppress crack propagation in the tension zone at the lower edge of the wooden beam. The truss structure includes: Two sets of upper chord members are arranged on the front and rear sides of the wooden beam, respectively, and both are connected to the two upper connection points of the end plate on the same side of the wooden beam through node plates provided at the ends; The lower chord assembly is located directly below the wooden beam, and each end is equipped with an anchor rod for connecting the two lower connection points of the same end plate of the wooden beam. The lower chord assembly can provide the tension force required for the reinforcement of the wooden beam. Multiple sets of web members are used to fix the upper chord and the lower chord assembly; The lower chord assembly includes: The flexible bottom chord is positioned directly below the wooden beam, with both ends fixedly connected to anchor rods. Multiple sets of adjusting rods are arranged parallel to each other along the length of the flexible lower chord and are distributed axially perpendicular to the flexible lower chord. The two ends of the adjusting rods are rotating adjustment ends, and a clamping gap is formed in the center for the flexible lower chord to pass through. By rotating the adjusting rod, the flexible lower chord can be wound around the outer circumference of the adjusting rod to change the tension of the lower chord assembly on the bottom of the wood. One end of each set of web members is fixedly connected to the upper chord, and the other end is provided with a positioning plate for the adjusting round rod to pass through and form a rotatable connection. A locking structure is also provided between the positioning plate and the adjusting rod to lock and fix the adjusting rod after it is rotated.

2. The reinforcement device for wooden beams of historical buildings according to claim 1, characterized in that, It also includes multiple sets of gusset plates, which are arranged parallel to each other at intervals along a direction perpendicular to the upper chord and are fixedly connected between the two sets of upper chords.

3. The reinforcement device for wooden beams of historical buildings according to claim 1, characterized in that, The lower chord assembly also includes: Multiple sets of pads are respectively placed between the two ends of the adjusting rod and the wooden beam, so that the wooden beam and the lower chord assembly can come into contact, ensuring that the wooden beam and the truss can work together when they are subjected to deformation.

4. The reinforcement device for wooden beams of historical buildings according to claim 1, characterized in that, The outer wall of the rotating adjustment end is provided with external threads, and the locking structure includes: Rotate the handwheel to move the rotating adjustment end that is fitted onto the adjusting rod, and achieve positioning engagement with the adjusting rod through the protrusion and slot structure; A limiting member is fixed to the side of the positioning plate facing the rotating handwheel and has a limiting groove for accommodating the rotating handwheel, used for circumferential positioning of the rotating handwheel; The positioning nut engages with the threaded end of the rotating adjustment to axially limit the rotating handwheel and prevent it from disengaging from the limiting groove.

5. A reinforcement device for wooden beams in historical buildings according to claim 1, characterized in that, The flexible lower chord is a steel strip or multiple parallel steel wire ropes or cables.

6. A reinforcement device for wooden beams in historical buildings according to claim 1, characterized in that, The upper connection point is a threaded rod structure, and the lower connection point is a through hole structure.

7. A reinforcement device for wooden beams in historical buildings according to claim 1, characterized in that, The clamping gap in the center of the adjusting rod is formed by two parallel cylindrical rods spaced apart. The rotating adjusting end is a cylindrical rod structure, and the sum of the diameters of the two cylindrical rods is less than the diameter of the rotating adjusting end.

8. A reinforcement device for wooden beams in historical buildings according to claim 1, characterized in that, The flexible lower chord and the anchor rod are detachably connected.

9. A reinforcement method for a wooden beam reinforcement device for a historical building according to any one of claims 1-8, characterized in that, Includes the following steps: S1, four end plates are placed at both ends of the wooden beam to form a closed body. FRP composite fabric is used to tighten the end plates to the wooden beam, and a reliable connection is formed by structural adhesive. S2, Anchor rods are installed between the lower connection points of the two end plates at the same end of the wooden beam and fixed with nuts. A flexible lower chord is installed between the two anchor rods, and multiple sets of adjusting round rods are arranged at intervals on the flexible lower chord. S3, weld node plates to both ends of the upper chord, and fix them to the upper connection point of the end plate by using the openings on the node plates; and bond multiple sets of lacing plates between the two sets of upper chords. S4, Install multiple sets of web members, one end of which is welded and fixed to the upper chord, and the other end is welded with a positioning plate, using the opening on the positioning plate for the end of the adjusting round rod to pass through; S5, a locking structure is installed between the adjusting rod and the positioning plate, and a pad is placed between the adjusting rod and the wooden beam. By rotating the adjusting rod, the flexible lower chord is changed from a relaxed state to a tensile state, providing the wooden beam with the required tension. Finally, the adjusting rod is locked and fixed by the locking structure to maintain the tension and locking state of the lower chord assembly, forming an effective truss structure system and completing the reinforcement of the wooden beam.

Images