Tensioning adjusting bolt-steel belt prestress device for reinforcing bamboo beam

Abstract

The tension adjusting bolt-steel belt prestress device comprises a tension steel belt and a tension adjusting bolt assembly, the two ends of the tension steel belt are fixed to the two ends of the bamboo beam through fastening assemblies correspondingly, and the tension adjusting bolt assembly is used for sharing tension borne by wood fibers on the lower layer of the bamboo beam to be reinforced. Therefore, the reinforcing effect is achieved; the tension adjusting bolt assembly is arranged in the middle of the bamboo-wood beam, located between the tension steel belt and the tension adjusting bolt assembly and used for adjusting the distance between the tension steel belt and the wood beam, so that the tensioning degree of the tension steel belt is adjusted, prestress is applied to the bamboo-wood beam, initial deformation can be effectively reduced by applying prestress to the beam, and the tensile strength of the bamboo-wood beam is improved. The influence caused by creep deformation can be reduced or eliminated by applying prestress in the using stage, and two-stage deformation control is achieved, so that deformation of the bamboo beam is controlled, stress distribution of the section is adjusted, beam bottom tensile stress is reduced, the overall bearing capacity of the bamboo beam is improved, and the damage form of the beam is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bamboo-wood structures in civil engineering, in particular to a tensioning and adjusting bolt-steel belt prestressing device which can be used for strengthening and consolidating bamboo-wood beams. Background Art

[0002] Bamboo and wood materials are green and low-carbon civil engineering materials. Bamboo and wood structure buildings have a high degree of assembly and good thermal insulation effect, which can achieve low carbon emissions and low energy consumption throughout the life cycle. With the deepening of the "dual carbon" strategy, my country's demand for green building materials and low-carbon buildings has increased dramatically, providing broad application prospects for bamboo and wood structures.

[0003] In terms of strength, when bamboo beams are bent, traditional bamboo beams are tensilely damaged along the grain, which is usually manifested as fiber breakage in the tensile zone at the bottom of the specimen. The entire damage process is very short and there are no obvious signs. It is a brittle failure. The compressive performance of bamboo beams cannot be fully exerted. The bearing capacity and stiffness of bamboo beams are insufficient, so it is necessary to take strengthening measures. On the other hand, due to the inherent defects of bamboo beams in actual projects, and often due to repeated stress, changes in moisture content and other factors, bamboo wood will be damaged, resulting in a decrease in bearing capacity and stiffness. In order to ensure the safety of the structure, it is necessary to reinforce it.

[0004] Traditional bamboo-wood beams are usually damaged by tension along the grain, which is usually manifested by the sudden breakage of the fibers on the tensile surface at the bottom of the specimen. The entire damage process is very short and there are no obvious signs. Most existing reinforcement structures include high-strength materials, such as steel plates, fiber cloths and fiberboards. When used, high-strength materials are pasted to the bottom of the beam. Although pasting these high-strength materials at the bottom of the beam can improve its bearing capacity, the effect of enhancing stiffness is not obvious due to the limited increase in cross-sectional height. Moreover, although pasting high-strength materials at the bottom of the beam can delay the time of tensile damage at the bottom of the beam to a certain extent, it is difficult to prevent the bamboo-wood beam from splitting. In this process, it often peels off from the beam, and the ductility of the bamboo-wood beam has not been fundamentally improved. Summary of the invention

[0005] The purpose of the present invention is to provide a tensioning adjustment bolt-steel belt prestressing device that can be used for strengthening and reinforcing bamboo-wood beams, which can determine the prestressing level of the bamboo-wood beams, control the deformation of the bamboo-wood beams, adjust the stress distribution of the cross section, and reduce the tensile stress at the bottom of the beam, thereby improving the overall bearing capacity of the bamboo-wood beams and improving the failure mode of the beams.

[0006] The technical solution of the present invention is:

[0007] A tensioning adjustment bolt-steel belt prestressing device that can be used for strengthening and reinforcing bamboo-wood beams comprises: a tensioned steel belt and a tension adjustment bolt assembly, wherein the two ends of the tensioned steel belt are respectively fixed to the two ends of the bamboo-wood beam by a fastening assembly, and are used to share the tension exerted on the lower wood fibers of the reinforced bamboo-wood beam, thereby achieving the effect of strengthening and reinforcing; the tension adjustment bolt assembly is arranged in the middle of the bamboo-wood beam, between the tensioned steel belt and the tension adjustment bolt assembly, and is used to adjust the distance between the tensioned steel belt and the wood beam, thereby adjusting the tensioning degree of the tensioned steel belt, thereby applying prestress to the bamboo-wood beam, and applying prestress to the beam can effectively reduce the initial deformation, and applying prestress during the use stage can reduce or eliminate the influence of creep, thereby realizing two-stage deformation control.

[0008] Furthermore, when the reinforcement and strengthening scenarios of bamboo-wood beams require a large tensioning distance, the tension steel belt adopts the first tension steel belt, and the first tension adjustment bolt assembly must pass through the second steel belt in the middle of the span of the beam, so the effective area of ​​the second steel belt does not include the bolt diameter part. Therefore, in order to save steel, the second steel belt is grooved to remove the middle part with less stress to save steel and form a double-strip structure. The tension adjustment bolt assembly adopts the first tension adjustment bolt assembly, and the fastening assembly for fixing the tension steel belt adopts the first fastening assembly, the first fastening assembly is a beam end anchor, and the first tension adjustment bolt assembly includes: A mid-beam pad is fixed in the middle of the bamboo-wood beam and is provided with two fixing holes; two first tension adjustment bolts are fixed in the fixing holes accordingly; a first top block is a long strip structure, the top of which contacts with the first tension steel belt and is provided with two screw holes, and the first tension steel belt is located between the two screw holes, the two screw holes match the threads of the two first tension adjustment bolts, and the first tension adjustment bolts are correspondingly arranged in the screw holes, and the first top block is raised and lowered by rotating the first tension adjustment bolt, thereby changing the height of the first tension steel belt from the bamboo-wood beam, and then adjusting the tension of the first tension steel belt.

[0009] Furthermore, the beam end anchor includes: a fixing plate for connecting the end of the first tension steel belt; two side plates, respectively connected to the two sides of the fixing plate, so that a clamping groove for clamping on the bamboo beam is formed between the two side plates, and two bolt holes are provided on the two side plates, and the positions of the bolt holes on the two side plates correspond one to one; two fixing bolts, respectively passing through the two bolt holes and fixed to the bamboo beam, so that the position of the fixing plate is fixed.

[0010] Furthermore, the first tensioned steel strip is pressed under the fixing plate near the end, and the end is folded toward the middle of the first tensioned steel strip and welded to the top surface of the fixing plate.

[0011] Furthermore, the diameter of the fixing hole on the cushion block in the first beam is smaller than the diameter of the first tension adjustment bolt, which is used for positioning the first tension adjustment bolt and reducing stress concentration of the bamboo-wood beam.

[0012] Furthermore, the installation angle of the beam end anchor can be adjusted and kept consistent with the angle of the first tension steel belt.

[0013] Furthermore, when the strengthening and reinforcement scenarios of bamboo-wood beams require a smaller tensioning distance, for example, when the tensioning distance is less than 100mm, the tension steel belt adopts a second tension steel belt, the fastening assembly adopts a second fastening assembly, and the tension adjustment bolt assembly adopts a second tension adjustment bolt assembly. The second tension adjustment assembly includes: a steel pad, with bolt holes at both ends and a plurality of mounting holes equidistantly arranged in the middle along the length direction. Steel pad fixing bolts are arranged in the bolt holes at both ends of the steel pad, and the steel pad fixing screws are screwed into the bamboo-wood beam to fix the steel pad to the bamboo-wood beam. A self-tapping screw 71 is screwed into the mounting hole to bear the shear stress. The two ends of the second tensioned steel belt are fixed to the two ends of the steel base plate by welding to transfer the shear stress. The second top block is a long strip structure with a screw hole in the middle. It is arranged in the middle of the steel base plate. A through groove is provided in the middle of the second tensioned steel belt along the length direction. The screw hole of the second top block is located in the middle of the through groove, and the two sides of the through groove are pressed on the top surface of the second top block. The second tensioning adjustment bolt has one end connected to the middle position of the steel base plate and the other end threadedly connected to the screw hole of the second top block.

[0014] Furthermore, the steel pad can be broken into three sections, namely the second beam middle pad and two beam end pads arranged on the top surface of the bamboo beam near the beam ends.

[0015] Furthermore, a pressure strip is arranged near the end position of the second tension steel strip and the end welding position of the steel pad, and bolt holes are opened on the pressure strip, and the bolt holes on the pressure strip are aligned with the bolt holes of the steel pad. The pressure strip, the second tension steel strip and the steel pad are fixed to the bamboo beam together by the steel pad fixing bolts, and the second tension steel strip and the steel pad are pressed tightly by the pressure strip to prevent the weld from tearing.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention installs a tensile steel belt on one side of the bamboo beam to share the tensile force on the fibers below the reinforced / reinforced bamboo beam, thereby achieving the effect of improving the bearing capacity of the bamboo beam. Fastening components are installed at both ends of the beam. Finally, the tension adjustment bolts in the middle of the beam are adjusted to change the tension distance, adjust the tightness of the tensile steel belt, and determine the prestress level, thereby controlling the deformation of the bamboo beam, adjusting the stress distribution of the cross section, and reducing the tensile stress at the bottom of the beam, thereby improving the overall bearing capacity of the bamboo beam and improving the failure form of the beam.

[0018] 2. The operation of applying prestress in the present invention is more convenient. By twisting the bolts of the tension-adjusting bolt assembly, the distance between the tensioned steel belt and the wooden beam can be adjusted, thereby adjusting the tension of the tensioned steel belt to complete the application of prestress. There is no need to rely on complex professional equipment, which greatly reduces the construction difficulty and cost, making prestressed technology more popular and easy to implement. In the stage of applying prestress, the prestress can effectively reduce the initial deformation, and in the use stage, the prestress can reduce or eliminate the influence of creep, thereby realizing two-stage deformation control.

[0019] 3. The present invention avoids the brittle tensile damage of the bottom of the bamboo-wood beam through reasonable design, so that the wood mainly bears the pressure, while the tensile steel belt bears the tension. The bending bearing capacity of the beam is greatly improved by setting the force arm of the tensioning point, thereby improving the safety and stability of the entire structure and improving the failure mode of the beam.

[0020] 4. The present invention arranges different structures of tensioned steel belts, tension adjustment bolt assemblies and fastening assemblies according to the prestress and tensioning distance required in different reinforcement scenarios of bamboo-wood beams, thereby ensuring the reliability of prestress transmission applied to bamboo-wood beams in different reinforcement scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the main structure of Example 1 of the present invention.

[0022] Figure 2 It is a perspective structural diagram of embodiment 1 of the present invention.

[0023] Figure 3 This is a structural schematic diagram of Example 1 of the present invention when the angle of the beam end anchor is installed consistent with the first tension steel belt.

[0024] Figure 4 This is a schematic diagram of the main structure of Example 2 of the present invention.

[0025] Figure 5 This is a schematic diagram of the structure when the steel base plate is arranged in multiple sections in Example 2 of the present invention.

[0026] Figure 6 for Figure 5 A perspective diagram of the local structure.

[0027] Figure 7 for Figure 5 An enlarged view of the structural schematic diagram of the middle A area.

[0028] Among them, 1. bamboo beam, 2. first tension adjusting bolt assembly, 21. first top block, 22. first tension adjusting bolt, 23. first beam center pad, 3. first tension steel belt, 4. first fastening assembly, 41. fixing plate, 42. side plate, 43. fixing bolt, 5. second tension adjusting bolt assembly, 51. second beam center pad, 52. second top block, 53. second tension adjusting bolt, 6. second tension steel belt, 7. steel pad, 71. self-tapping screw, 8. pressure strip, 81. steel pad fixing bolt. DETAILED DESCRIPTION

[0029] Combine the following Figures 1 to 7 , the specific implementation methods of the present invention are described in detail. In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation and be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0031] Example

[0032] A tensioning adjustment bolt-steel belt prestressing device that can be used for strengthening and reinforcing bamboo-wood beams comprises: a tensioned steel belt and a tension-adjusting bolt assembly, wherein the two ends of the tensioned steel belt are respectively fixed to the two ends of the bamboo-wood beam 1 through a fastening assembly, and are used to share the tension exerted on the lower wood fibers of the reinforced bamboo-wood beam, thereby achieving the effect of strengthening and reinforcing; the tension-adjusting bolt assembly is arranged in the middle of the bamboo-wood beam 1, between the tensioned steel belt and the tension-adjusting bolt assembly, and is used to adjust the distance between the tensioned steel belt and the wood beam, thereby adjusting the tensioning degree of the tensioned steel belt, thereby applying prestress to the bamboo-wood beam 1, and applying prestress to the beam can effectively reduce the initial deformation, and applying prestress during the use stage can reduce or eliminate the influence of creep, thereby realizing two-stage deformation control.

[0033] Application Example 1

[0034] like Figure 1-Figure 3As shown, when the strengthening and reinforcement scenario of the bamboo-wood beam 1 requires a larger tensioning distance, for example, the tensioning distance is greater than 100 mm, the tension steel belt adopts the first tension steel belt 3, the tension adjustment bolt assembly adopts the first tension adjustment bolt assembly 2, and the fastening assembly for fixing the tension steel belt adopts the first fastening assembly 4, the first fastening assembly 4 is a beam end anchor, and the first tension adjustment bolt assembly 2 includes: a first beam pad 23, two first tension adjustment bolts 22 and a first top block 21, the first beam pad 23 is fixed in the middle of the bamboo-wood beam 1, and is provided with two fixing holes; the two first tension adjustment bolts 22 are fixed in the fixing holes accordingly; the first top block 21 is a long strip structure, the top of which is in contact with the first tension steel belt 3, and is provided with two screw holes, as shown in FIG. Figure 1 As shown, the first tension steel belt 3 is located between two screw holes, and the two screw holes match the threads of the two first tension adjustment bolts 22. The first tension adjustment bolts 22 are correspondingly arranged in the screw holes. By rotating the first tension adjustment bolts 22, the first top block 21 is raised and lowered, thereby changing the height of the first tension steel belt 3 from the bamboo beam 1, and then adjusting the tensioning degree of the first tension steel belt 3.

[0035] like Figure 1 and Figure 2 As shown, the beam end anchor includes: a fixing plate 41, two side plates 42 and two fixing bolts 43, the fixing plate 41 is used to connect the end of the first tension steel belt 3; the two side plates 42 are respectively connected to the two sides of the fixing plate 41, so that a clamping groove for clamping on the bamboo beam 1 is formed between the two side plates 42, and two bolt holes are provided on the two side plates 42, and the positions of the bolt holes on the two side plates 42 correspond to each other; the two fixing bolts 43 are respectively passed through the two bolt holes to be fixed to the bamboo beam 1, so that the position of the fixing plate 41 is fixed.

[0036] like Figure 1 As shown, the first tensioned steel belt 3 is pressed under the fixing plate 41 near the end, and the end is folded toward the middle of the first tensioned steel belt 3 and welded to the top surface of the fixing plate 41, which achieves a better fixed connection effect and avoids the end of the first tensioned steel belt 3 from splitting from the fixing plate 41.

[0037] In some embodiments, the diameter of the fixing hole on the cushion block 23 in the first beam is smaller than the diameter of the first tension adjustment bolt 22 , which is used to position the first tension adjustment bolt 22 and reduce stress concentration of the bamboo beam 1 .

[0038] like Figure 3 As shown, the installation angle of the beam end anchor can be adjusted and kept consistent with the angle of the first tension steel belt 3. When the string distance is large, the installation angle of the beam end anchor is adjusted to be consistent with the angle of the first tension steel belt 3.

[0039] Application Example 2

[0040] like Figure 4-Figure 7 As shown, when the reinforcement and strengthening scenario of the bamboo-wood beam 1 requires a smaller tensioning distance, for example, the tensioning distance is less than 100 mm, the tension steel belt adopts the second tension steel belt 6, the fastening assembly adopts the second fastening assembly, and the tension adjustment bolt assembly adopts the second tension adjustment bolt assembly 5. The second tension adjustment assembly 5 includes: a steel pad 7, a second top block 52 and a second tension adjustment bolt 53. A pressure strip 8 is provided near the end position of the second tension steel belt 6 and the end welding position of the steel pad 7. Bolt holes are provided on the pressure strip 8, and the bolt holes on the pressure strip 8 are aligned with the bolt holes of the steel pad 7. The pressure strip 8, the second tension steel belt 6 and the steel pad 7 are fixed to the bamboo-wood beam 1 together by the steel pad fixing bolts 81, and the second tension steel belt 6 and the steel pad 7 are pressed tightly by the pressure strip 8 to prevent the weld from tearing. As shown Figure 4 As shown, when the bamboo beam is long or the shear force between the bamboo beam and the steel pad 7 is large, that is, the prestress is large, the steel pad 7 can continuously cover the entire bamboo beam, bolt holes are opened at both ends of the steel pad 7, and multiple installation holes are opened equidistantly in the middle along the length direction, and steel pad fixing bolts 81 are set at the bolt holes at both ends of the steel pad 7, so that the steel pad fixing bolts 81 are inserted into the bamboo beam 1, so that the steel pad 7 and the bamboo beam 1 are fixed, and the self-tapping screws 71 are screwed into the installation holes to bear the shear stress. The two ends of the second tension steel belt 6 are fixed to the two ends of the steel pad 7 by welding to transfer the shear stress; as shown in FIG. Figure 7 As shown, the second top block 52 is a long strip structure with a screw hole in the middle, and is arranged in the middle of the steel backing plate 7, so that the second tension adjustment component 5 passes through the second tension steel belt 6, and at the same time, in order to remove the part with less stress in the middle of the second tension steel belt 6, as shown in FIG. Figure 4 and Figure 5 As shown, a through slot is opened in the middle of the second tensioned steel belt 6 along the length direction, the screw hole of the second top block 52 is located in the middle of the through slot, and both sides of the through slot are pressed on the top surface of the second top block 5; one end of the second tensioning adjustment bolt 53 is connected to the middle position of the steel pad 7, and the other end is threadedly connected to the screw hole of the second top block 52.

[0041] like Figure 5 and Figure 6 As shown, when the length of the reinforced / strengthened wood beam is appropriate, the steel pad 7 can be disconnected from the middle, leaving only the appropriate lengths at the two ends and the necessary installation hole sections. At this time, the steel pad 7 can prevent the second tension adjustment bolt 53 and the pressure strip 8 from causing local compression damage to the wood cross grain where the concentrated force is relatively large. Preferably, according to the length of the reinforced bamboo beam 1, the steel pad 7 can be disconnected into three sections, namely, the second beam middle pad 51 and two beam end pads arranged on the top surface of the bamboo beam 1 near the beam end.

[0042] The above disclosures are only several preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A tensioning and adjusting bolt-steel belt prestressing device that can be used for strengthening bamboo and wood beams, characterized in that: include: A tension steel belt and a tension adjustment bolt assembly, wherein the two ends of the tension steel belt are respectively fixed to the two ends of the bamboo beam (1) through a fastening assembly, and are used to share the tension exerted on the lower wood fibers of the reinforced bamboo beam; the tension adjustment bolt assembly is arranged in the middle of the bamboo beam (1), between the tension steel belt and the tension adjustment bolt assembly, and is used to adjust the distance between the tension steel belt and the wood beam, thereby adjusting the tension of the tension steel belt, and applying prestress to the bamboo beam (1) to achieve deformation control.

2. A tensioning and adjusting bolt-steel belt prestressing device for strengthening and reinforcing bamboo-wood beams according to claim 1, characterized in that: The tensioned steel belt adopts a first tensioned steel belt (3), the tension adjustment bolt assembly adopts a first tension adjustment bolt assembly (2), and the fastening assembly for fixing the tensioned steel belt adopts a first fastening assembly (4), the first fastening assembly (4) is a beam end anchor, and the first tension adjustment bolt assembly (2) comprises: a first beam cushion block (23), fixed in the middle of the bamboo beam (1), and provided with two fixing holes; two first tension adjustment bolts (22), fixed in the fixing holes correspondingly; a first top block (21), which is a long strip structure The top of the first tension steel belt (3) is in contact with the top and is provided with two screw holes, and the first tension steel belt (3) is located between the two screw holes, and the two screw holes match the threads of the two first tension adjustment bolts (22), and the first tension adjustment bolts (22) are correspondingly arranged in the screw holes. By rotating the first tension adjustment bolts (22), the first top block (21) is raised and lowered, thereby changing the height of the first tension steel belt (3) from the bamboo beam (1), thereby adjusting the tension of the first tension steel belt (3).

3. The tensioning adjustment bolt-steel belt prestressing device for strengthening bamboo-wood beams according to claim 2 is characterized in that: The beam end anchor comprises: A fixing plate (41) used for connecting the end of the first tension steel belt (3); Two side plates (42) are respectively connected to the two sides of the fixing plate (41) so that a clamping groove for clamping the bamboo beam (1) is formed between the two side plates (42), and two bolt holes are provided on each of the two side plates (42), and the positions of the bolt holes on the two side plates (42) correspond to each other; Two fixing bolts (43) pass through the two bolt holes respectively and are fixed to the bamboo beam (1), thereby fixing the position of the fixing plate (41).

4. A tensioning and adjusting bolt-steel belt prestressing device for strengthening and reinforcing bamboo-wood beams according to claim 3, characterized in that: The first tensioned steel strip (3) is pressed under the fixing plate (41) near the end, and the end is folded toward the middle of the first tensioned steel strip (3) and welded to the top surface of the fixing plate (41).

5. The tensioning adjustment bolt-steel belt prestressing device for strengthening bamboo-wood beams according to claim 2 is characterized in that: The diameter of the fixing hole on the cushion block (23) in the first beam is smaller than the diameter of the first tension adjustment bolt (22), and is used for positioning the first tension adjustment bolt (22) and reducing stress concentration of the bamboo beam (1).

6. The tensioning adjustment bolt-steel belt prestressing device for strengthening bamboo-wood beams according to claim 3 is characterized in that: The installation angle of the beam end anchor can be adjusted, and the angle is kept consistent with the angle of the first tension steel belt (3).

7. The tensioning adjustment bolt-steel belt prestressing device for strengthening bamboo-wood beams according to claim 1 is characterized in that: The tension steel belt adopts a second tension steel belt (6), the fastening assembly adopts a second fastening assembly, the tension adjustment bolt assembly adopts a second tension adjustment bolt assembly (5), and the second tension adjustment assembly (5) comprises: The steel pad (7) has bolt holes at both ends and a plurality of mounting holes equidistantly disposed in the middle along the length direction. The bolt holes at both ends of the steel pad (7) are provided with steel pad fixing bolts (71). The steel pad fixing screws (71) are inserted into the bamboo beam (1) to fix the steel pad (7) to the bamboo beam (1). The self-tapping screws (71) are screwed into the mounting holes to bear shear stress. The two ends of the second tension steel belt (6) are fixed to the two ends of the steel pad (7) by welding to transfer the shear stress. The second top block (52) is a long strip structure with a screw hole in the middle, and is arranged in the middle of the steel pad (7). A through groove is arranged in the middle of the second tension steel belt (6) along the length direction. The screw hole of the second top block (52) is located in the middle of the through groove, and both sides of the through groove are pressed on the top surface of the second top block (5); One end of the second tensioning and adjusting bolt (53) is connected to the middle position of the steel backing plate (7), and the other end is threadedly connected to the screw hole of the second top block (52).

8. The tensioning adjustment bolt-steel belt prestressing device for strengthening bamboo-wood beams according to claim 7 is characterized in that: The steel pad (7) can be broken into three sections, which are the second beam mid-pad (51) and two beam end pads arranged on the top surface of the bamboo beam (1) near the beam ends.

9. The tensioning adjustment bolt-steel belt prestressing device for strengthening bamboo-wood beams according to claim 7 is characterized in that: A pressure strip (8) is arranged near the end position of the second tension steel strip (6) and the end welding position of the steel pad (7), and a bolt hole is opened on the pressure strip (8). The bolt hole of the pressure strip (8) is aligned with the bolt hole position on the steel pad (7), and the pressure strip (8), the steel pad (7) and the bamboo beam (1) are fixed by the steel pad fixing bolts (81). The pressure strip (8) is used to press the second tension steel strip (6) and the steel pad (7) to prevent the weld between the second tension steel strip (6) and the steel pad (7) from being torn.

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