A reinforcement device for a reinforced concrete T-beam bridge and its construction method

Abstract

The present invention discloses a reinforcement device for a reinforced concrete T-shaped beam bridge and its construction method. The reinforcement device includes a deformed template in a shape similar to a "U" formed by two side plates and a bottom plate. Both side plates are arranged at an obtuse angle with the bottom plate, and at least two fixed supports are respectively provided on the two side plates at intervals. A clamping mechanism is connected to the back of each fixed support. By pushing the fixed supports through the clamping mechanism, the deformed template is driven to wrap the T-shaped beam web of the reinforced concrete T-shaped beam bridge to be reinforced and prestress it. At the same time, the deformed template and the T-shaped beam web are combined into one by high-strength fasteners and the method of grouting cement mortar. The reinforcement device of the present invention can not only apply external prestress, improve the shear resistance and crack resistance of the structure, but also increase the cross-sectional size and improve the bearing capacity of the reinforced member, that is, it combines the advantages of the method of increasing the cross-sectional area and the method of pasting steel plates. The reinforcement effect is remarkable and the construction is convenient, which is convenient for popularization and application.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering technology, specifically relating to a reinforcement device and construction method for reinforced concrete T-beam bridges, mainly used for reinforcement of reinforced concrete T-beams with insufficient shear bearing capacity or cracks. Background Technology

[0002] Reinforced concrete T-beam bridges refer to beam bridges with T-beams as the main load-bearing structure. When a positive bending moment is generated under load on the bridge, the T-beam, which is wider at the top and narrower at the bottom, fully utilizes the high compressive strength of concrete and the high tensile strength of steel bars under the combined effect of the reinforcement at the bottom edge. This saves materials and reduces self-weight compared to rectangular beam bridges, while also offering advantages such as simple structure and convenient construction. Therefore, they occupy a pivotal position in my country's highway transportation system. However, due to the low standards of early bridge construction and the increasing number of large and heavy vehicles with my country's rapid economic development, overloading has become increasingly serious. Coupled with inadequate management and maintenance, some reinforced concrete T-beam bridges have developed varying degrees of cracks and insufficient load-bearing capacity. However, demolishing these old bridges and rebuilding new ones would require huge investments and disrupt traffic, affecting people's normal travel. Therefore, reinforcing existing reinforced concrete T-beam bridges has become a key research focus.

[0003] Currently, the main methods for reinforcing beam bridges include carbon fiber bonding, cross-section enlargement, and steel plate bonding. Carbon fiber bonding involves bonding reinforced composite materials to the tension edges or weak points of the concrete structure, forming an integral whole with the structure. This replaces the need for additional reinforcing steel bars, improving the load-bearing capacity of the main beam and achieving the purpose of reinforcement. However, this method does not significantly limit cracking or improve the performance of reinforced concrete T-beam bridges, and its high cost due to the use of composite materials further compresses the load. Cross-section enlargement is a traditional beam reinforcement method that increases the original beam's reinforcing steel bars while simultaneously pouring new concrete on the outer side to enlarge the beam's cross-section. It is typically suitable for locations with significant stress, such as mid-span or the compression zone at the top of the beam. It generally involves increasing the height and thickness of the beam ribs and thickening the bridge deck. The disadvantages include the need for pre-installed reinforcing mesh and concrete pouring, making construction relatively complex, resulting in long construction times and low efficiency. The steel plate bonding method falls between the two methods mentioned above. It uses chemical adhesives to bond steel plates to the surface of concrete members, utilizing the tensile strength of the steel plates to improve the structural load-bearing capacity. However, its reinforcement effect depends heavily on the environment of the bridge and construction experience. For example, in humid or saline-alkali environments, the adhesion between the adhesive and the steel plate may decrease, and it is not suitable for plain concrete beams. In other words, while both the cross-section enlargement method and the steel plate bonding method can be used to some extent to reinforce reinforced concrete T-beam bridges, both have certain drawbacks. Therefore, there is an urgent need to design a new reinforcement measure for reinforced concrete T-beam bridges.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The object of the present invention is to overcome the shortcomings of the above-mentioned prior art, and to provide a reinforcement device for a reinforced concrete T-shaped beam bridge and its construction method. The present invention drives a fixed support through a clamping mechanism, and then applies prestress to the deformation templates arranged on both sides of the T-beam web. At the same time, the deformation templates and the T-beam web are integrated by means of fasteners and grouting of cement mortar. The above measures take into account the advantages of the method of increasing the cross-section and the method of bonding steel plates, thereby achieving the goal of improving the shear resistance, crack resistance and bearing capacity of the reinforced concrete T-shaped beam bridge.

[0006] The object of the present invention is solved by the following technical solutions:

[0007] On the one hand, the present invention provides a reinforcement device for a reinforced concrete T-shaped beam bridge, which includes a deformation template in the shape of a "匚" formed by two side plates and a bottom plate. The two side plates of the deformation template are both arranged at an obtuse angle with the bottom plate. At least two fixed supports are respectively arranged on the two side plates of the deformation template at intervals. A clamping mechanism is connected to the back of each fixed support. By pushing the fixed support through the clamping mechanism, the two side plates of the deformation template are driven to abut against the T-beam web of the to-be-reinforced reinforced concrete T-shaped beam bridge, so as to wrap the outer surface of the T-beam web with the deformation template and apply prestress to it, and the deformation template and the T-beam web are fixedly connected by fasteners.

[0008] Further, the deformation template is an integrally formed structure, made of low-carbon steel material, and the thickness of the deformation template is non-uniformly arranged;

[0009] Among them, the thickness of the bottom plate is 5 mm to 8 mm; the thickness of the area where the fixed supports are arranged in the two side plates is greater than or equal to 50 mm, and the thickness of the remaining areas in the two side plates is 12 mm to 16 mm.

[0010] Further, the two side plates of the deformation template and the fixed supports are all connected by a mortise and tenon structure.

[0011] Further, on the two side plates of the deformation template, a dovetail groove is arranged in the area connected to the fixed support, and correspondingly, a dovetail tenon is arranged on the side of the fixed support away from the clamping mechanism and is matched with the dovetail groove.

[0012] Further, the fixed support is a cavity structure, and a plurality of compression springs are evenly arranged in its cavity. A plurality of through holes for the compression springs to extend out are arranged at one end of the fixed support where the dovetail tenon is located, so as to always squeeze the deformation template by the compression springs.

[0013] Further, each clamping mechanism includes a steel plate strip, a steel strand and a fixed anchor;

[0014] One end of the steel strip is provided with a bent portion, and the other end is provided with a first through hole. The end of the steel strip with the bent portion is connected to the fixed support, and the connection point is located in the middle of the bent portion. After the steel strand passes through the first through hole at the other end of the steel strip, it is locked by a fixed anchor. The steel strand is tensioned by external force, and the connection point between the bent portion and the fixed support is used as the fulcrum, so that the steel strip pushes the fixed support and drives the deformation template to apply prestress to the web of the T-beam.

[0015] Furthermore, an L-shaped connecting plate is fixedly installed on the back of the fixed support. One end of the steel strip with a bent portion is installed inside the L-shaped connecting plate, and the steel strip is rotated and installed on the horizontal section of the L-shaped connecting plate by means of a threaded cylindrical pin and nut. A gap is provided between the vertical section of the L-shaped connecting plate and the steel strip to prevent interference between the steel strip and the vertical section of the L-shaped connecting plate when the fixed support is rotated and pushed.

[0016] The end of the steel strip with the first through hole should extend to the outside of the web of the T-beam, so as to facilitate the application of prestress to the web of the T-beam by means of external force to tension the steel strands.

[0017] Furthermore, the thickness of the steel strip is greater than or equal to 50 mm, the diameter of the steel strand is greater than or equal to 12 mm, and the fixing anchor is a JM type anchor, an XM type anchor, or a pier head anchor.

[0018] Furthermore, multiple second through holes are provided at intervals on both sides of the deformable template, and the multiple second through holes are arranged in at least two rows on each side plate. Correspondingly, blind holes are provided on the web of the T-beam along the longitudinal direction of the beam bridge, corresponding to the number and position of the second through holes. The deformable template is fixed to the web of the T-beam with high-strength fasteners. After fixing, cement mortar is injected into the gap between the deformable template and the web of the T-beam, and epoxy protective paint is applied to the outer surface of the deformable template.

[0019] Secondly, the present invention provides a construction method for a reinforcement device for a reinforced concrete T-beam bridge as described above, the construction method comprising the following steps:

[0020] Step 1: First, clean the web of the T-beam of the reinforced concrete T-beam bridge to be reinforced, and open blind holes on both sides of the web of the T-beam to be fixedly connected to the deformation template. Then, use epoxy resin adhesive to repair the concrete spalling and cracks on the web of the T-beam.

[0021] Step 2: Apply epoxy resin adhesive to the inside of the deformable template, then lift the deformable template to the predetermined installation position of the T-beam web and install fixed supports at the corresponding positions on both sides of the deformable template. A clamping mechanism is connected to the back of the fixed supports. Finally, the clamping mechanism pushes the fixed supports, thereby causing the two sides of the deformable template to abut against the T-beam web to apply prestress to the T-beam web.

[0022] Step 3: Finally, fix the deformable template to the web of the T-beam using fasteners. After fixing, fill the gap between the deformable template and the web of the T-beam with cement mortar, and apply epoxy protective paint to the outer surface of the deformable template.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The reinforcement device provided by this invention mainly consists of a deformable template, fixed supports, a clamping mechanism, and high-strength fasteners. The deformable template is composed of two side plates and a bottom plate forming a U-shaped structure. The fixed supports and clamping mechanism are located outside the side plates of the deformable template, and a compression spring is installed between the fixed supports and the deformable template. Therefore, the force of the clamping mechanism can push the fixed supports, thereby causing the side plates of the deformable template to abut against the web of the T-beam. This not only allows the deformable template to partially enclose the web of the T-beam but also converts the force of the clamping mechanism into prestress applied to the web of the T-beam. Furthermore, the deformable template and the web of the T-beam are fixedly connected by high-strength fasteners, and cement mortar is injected into the joint between them to form a unified structure. Compared to the existing technology of laying steel mesh on the beam surface, the installation of the deformable template is faster and more convenient, and the use of the deformable template reduces construction difficulties caused by concrete flow, improving the quality of the pouring process. In summary, this invention applies force through a clamping mechanism and integrates the deformable template with the web of the T-beam using fasteners and cement mortar injection. This not only applies external prestress to improve the shear and crack resistance of the structure, but also increases the cross-sectional dimensions to enhance the load-bearing capacity of the reinforced component. In other words, the reinforcement measures adopted in this invention combine the advantages of both the cross-sectional enlargement method and the steel plate bonding method. Attached Figure Description

[0025] The accompanying drawings are incorporated in and form part of this specification, and together with the description serve to explain the principles of the invention.

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural diagram of the reinforcement device of the present invention in use;

[0028] Figure 2 This is a front view structural diagram of the reinforcement device of the present invention in use;

[0029] Figure 3 This is a side view of the reinforcement device of the present invention in use.

[0030] Figure 4 This is a schematic diagram showing the connection between the deformable template, the fixed support, the compression spring, and the clamping mechanism in this invention.

[0031] Wherein: 1 is the deformable template; 2 is the fixed support; 3 is the clamping mechanism; 4 is the fastener; 5 is the compression spring; 6 is the cylindrical pin; 11 is the dovetail groove; 12 is the second through hole; 21 is the dovetail tenon; 22 is the L-shaped connecting plate; 31 is the steel strip; 32 is the steel strand; 33 is the fixed anchor; 311 is the bending part; 312 is the first through hole; A is the web of the T-beam. Detailed Implementation

[0032] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses consistent with some aspects of the invention as detailed in the appended claims.

[0033] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] Please see Figures 1-4, an embodiment of the present invention provides a reinforcement device for a reinforced concrete T-shaped beam bridge, which includes a deformed template in the shape of a "C" formed by two side plates and a bottom plate. Both side plates are arranged at an obtuse angle to the bottom plate, and at least two fixed supports 2 are respectively arranged at intervals on the two side plates of the deformed template 1. A clamping mechanism 3 is connected to the back surface of each fixed support 2 (this back surface refers to the side opposite to the connection of the fixed support 2 and the side plate of the deformed template 1). Through the above settings, when processing a reinforced concrete T-shaped beam bridge, the clamping mechanism 3 uses an external force to push the fixed support 2, thereby driving the two side plates of the deformed template 1 to abut against the T-shaped beam web A of the to-be-reinforced reinforced concrete T-shaped beam bridge, so that the deformed template 1 wraps three surfaces of the T-shaped beam web A and applies prestress to two opposite surfaces thereof, for enhancing the shear resistance and crack resistance of the reinforced concrete T-shaped beam bridge; at the same time, the deformed template 1 and the T-shaped beam web A are combined into one body by means of high-strength fasteners 4 and pouring cement mortar, increasing the cross-sectional size of the T-shaped beam web A and improving the bearing capacity of the T-shaped beam web A.

[0035] Specifically, the deformed template 1 used in the embodiment of the present invention is an integrally formed structure, made of low-carbon steel material, and the thickness of the deformed template 1 is non-uniformly set. Preferably, the thickness of the bottom plate is generally set to 5 mm to 8 mm; the thickness of the area where the fixed support 2 is arranged in the two side plates is greater than or equal to 50 mm, and the thickness of the remaining area is 12 mm to 16 mm, that is, the side plate thickness is greater than the bottom plate thickness, because the side plate is the direct force-bearing member when reinforcing the T-shaped beam web A. The deformed template 1 of the present invention is integrally in the shape of a " 匚 " structure, and both side plates are arranged at an obtuse angle to the bottom plate. In this way, when reinforcing the T-shaped beam web A, on the one hand, it is convenient for installation; on the other hand, the two side plates applying prestress to the T-shaped beam web A are connected as a whole through the bottom plate, forming a restraint with each other, thereby enhancing the shear resistance and crack resistance of the T-shaped beam web A.

[0036] In the embodiment of the present invention, the two side plates of the deformed template 1 and the fixed support 2 are both connected by a mortise and tenon structure. The specific connection part is as Figure 4 shown, including a dovetail groove 11 arranged in the area where the two side plates of the deformed template 1 are connected to the fixed support 1, and correspondingly, a dovetail tenon 21 is arranged on the side of the fixed support 2 away from the clamping mechanism 3 and is matched with the dovetail groove 11.

[0037] It is worth noting that, in order to avoid the clamping mechanism 3 damaging the structure at the connection between the deformable template 1 and the fixed support 2 when pushing the fixed support 2 to compress the deformable template 1, and to prevent uneven stress on the deformable template 1, which would lead to excessive concentration of prestress on the web A of the T-beam, the present invention sets the fixed support 2 as a cavity structure. Multiple compression springs 5 ​​are evenly distributed within the cavity, and multiple through holes for the compression springs 5 ​​to extend from one end of the dovetail tenon 21. Thus, the compression springs 5 ​​continuously compress the deformable template 1, transforming the rigid connection between the deformable template 1 and the fixed support 2 into an elastic connection. Therefore, the deformable template 1 can disperse the force applied by the clamping mechanism 3, converting this force into prestress on the web A of the concrete T-beam, and distributing it evenly across the web A of the T-beam in contact with the deformable template 1.

[0038] In this embodiment of the invention, each clamping mechanism 3 includes a steel strip 31, a steel strand 32, and a fixing anchor 33. One end of the steel strip 31 has a bent portion 311, and the other end has a first through hole 312. The end of the steel strip 31 with the bent portion 311 is connected to the fixing support 2, with the connection point located in the middle of the bent portion 311. The steel strand 32 passes through the first through hole 312 at the other end of the steel strip 31 and is locked by the fixing anchor 33. This invention utilizes the lever principle, tensioning the steel strand 32 with external force and using the connection point between the bent portion 311 and the fixing support 2 as a fulcrum, causing the steel strip 31 to push the fixing support 2, thereby driving the deformable template 1 to apply prestress to the web A of the T-beam.

[0039] In this invention, the steel strip 31, as the component directly bearing the tensile load, needs to ensure sufficient rigidity. In this embodiment, the thickness of the steel strip 31 should be greater than or equal to 50 mm. Meanwhile, the purpose of the steel strands 32 is to tension the steel strip 31, causing it to compress the spring 5, thereby allowing the deformable template 1 to achieve sufficient deformation. Therefore, the steel strands 32 need to have sufficient strength. For this purpose, in this embodiment, the diameter of each steel strand 32 should be greater than or equal to 12 mm, and each steel strand 32 consists of at least 14 steel strands. The fixing anchor 33 needs to simultaneously anchor 5 to 6 steel strands 32. The fixing anchor 33 is preferably a JM type anchor, an XM type anchor, or a head anchor. Of course, screw end rods or steel conical anchors can also be selected according to actual needs, as long as they can achieve the purpose of locking the steel strands 32.

[0040] Because the bending portion 311 experiences a large instantaneous load when the clamping mechanism 3 is subjected to external force, a fixed connection would easily damage the connection structure. Therefore, this invention employs a buffered connection method. For example, in this embodiment, the fixed support 2 and the clamping mechanism 3 are connected by a pin, which buffers the load by rotating the pin. Specifically, an L-shaped connecting plate 22 is fixedly installed on the back of the fixed support 2. One end of the steel strip 31 with the bending portion 311 is located inside the L-shaped connecting plate 22, and the steel strip 31 is rotated and positioned on the horizontal section of the L-shaped connecting plate 22 by a threaded cylindrical pin 6 and a nut. A gap is provided between the vertical section (outer section) of the L-shaped connecting plate 22 and the steel strip 21 to prevent interference between the steel strip 31 and the vertical section of the L-shaped connecting plate 22 when the fixed support 2 is rotated and pushed. The function of the L-shaped connecting plate 22 is to act as a medium for the connection between the fixed support 2 and the clamping mechanism 3. Since the pin connection is detachable, the cylindrical pin 6 and the nut can be reused while ensuring the stability of the clamping mechanism 3. In addition, protective paint can be applied to the outside of the cylindrical pin 6.

[0041] Preferably, the steel strip 31 can be set to be slightly longer, so that the end with the first through hole 312 extends to the outside of the web A of the T-beam, so as to facilitate the tensioning of the steel strands 32 with external force to apply prestress to the web A of the T-beam.

[0042] In addition, in this embodiment of the invention, multiple second through holes 12 are provided at intervals on both side plates of the deformable template 1, and the multiple second through holes 12 are arranged in at least two rows on each side plate. Correspondingly, blind holes are provided on the web A of the T-beam along the longitudinal direction of the beam bridge, corresponding to the number and position of the second through holes 12. Preferably, there are no less than ten blind holes in a single row, and the spacing between the holes is greater than or equal to 15 cm. The deformable template 1 is fixed to the web A of the T-beam with high-strength fasteners 4 (such as high-strength expansion bolts). After fixing, cement mortar is injected into the joint between the deformable template 1 and the web A of the T-beam. That is, the two are combined into one by using high-strength fasteners 4 and injecting cement mortar, thereby increasing the cross-sectional size of the web A of the T-beam and improving its load-bearing capacity. In addition, epoxy protective paint is applied to the outer surface of the deformable template 1 to prevent it from failing after long-term use and to improve the service life of the reinforced concrete T-beam bridge.

[0043] This invention also provides a construction method for a reinforcement device based on a reinforced concrete T-beam bridge, specifically including the following steps:

[0044] 1) First, clean the web A of the T-beam of the reinforced concrete T-beam bridge to be reinforced, and open blind holes on both sides of the web A of the T-beam to be fixedly connected with the deformation template 1. Then, use epoxy resin adhesive to repair the concrete spalling and cracks on the web A of the T-beam.

[0045] 2) Transport the prefabricated or purchased deformable template 1, fixed support 2, and clamping mechanism 3 and other reinforcement materials to the processing destination. Then, apply epoxy resin adhesive to the inside of the deformable template 1. Then, lift the deformable template 1 to the predetermined installation position of the web A of the T-beam using hoisting equipment and install the fixed support 2 at the corresponding positions on both sides of the deformable template 1. The clamping mechanism 3 is connected to the back of the fixed support 2. Finally, the clamping mechanism 3 pushes the fixed support 2, thereby driving the two sides of the deformable template 1 to abut against the web A of the T-beam to apply prestress to the web A of the T-beam.

[0046] Specifically, the steel strand 32 can be tensioned from the left side first, causing the steel strip 31 on the left side to contract and drive the fixed support 2 and compression spring 5 to move to the right, thereby squeezing the deformable template 1 to gradually deform it until the left side plate of the deformable template 1 is in complete contact with the left side of the web A of the T beam. Then, the tensioning of the steel strand 32 is stopped and its position is locked, and then the other side is tensioned; or the order of the two can be reversed.

[0047] 3) Finally, use multiple high-strength fasteners 4 (the same number as the number of openings) to fix the deformable template 1 to the web plate A of the T-beam. When fixing the fasteners 4, start fixing from both sides at the same time. After fixing, fill the gap between the deformable template 1 and the web plate A of the T-beam with cement mortar, and apply epoxy protective paint to the outer surface of the deformable template 1. Before applying the epoxy protective paint, clean the dust on the deformable template 1, and then apply it evenly in the same direction. Wait 4 to 8 hours before applying the second coat.

[0048] In this embodiment of the invention, the various parts used in the specific construction and reinforcement device are all made according to the actual situation of the web A of the T-beam of the reinforced concrete T-beam bridge to be reinforced, and will not be described in detail.

[0049] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0050] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A reinforcing device for a reinforced concrete T-beam bridge, characterized by, The application relates to a deformation template (1) which comprises two side plates and a bottom plate and is shaped like a Chinese character 'fang' and is provided with at least two fixed supports (2) on the two side plates at intervals, each fixed support (2) is connected with a clamping mechanism (3), the fixed support (2) is pushed by the clamping mechanism (3) to drive the two side plates of the deformation template (1) to abut against the T-shaped beam web (A) of a T-shaped beam bridge to be reinforced, so that the deformation template (1) wraps the outer surface of the T-shaped beam web (A) and prestress is applied to the T-shaped beam web (A), and the deformation template (1) is fixedly connected with the T-shaped beam web (A) through high-strength fasteners (4). A dovetail groove (11) is arranged on the area of the two side plates of the deformation template (1) and connected with the fixed support (2), and a dovetail tenon (21) is arranged on the side of the fixed support (2) away from the clamping mechanism (3) and matched with the dovetail groove (11). Each clamping mechanism (3) comprises a steel strip (31), a steel strand (32) and a fixed anchor (33), one end of the steel strip (31) is provided with a bending part (311), the other end is provided with a first through hole (312), one end of the steel strip (31) provided with the bending part (311) is connected with the fixed support (2), and the connecting point is located at the middle position of the bending part (311), the steel strand (32) passes through the first through hole (312) at the other end of the steel strip (31) and is locked through the fixed anchor (33), the steel strand (32) is tensioned through external force, the steel strip (31) pushes the fixed support (2) to drive the deformation template (1) to apply prestress to the T-shaped beam web (A) with the bending part (311) and the fixed support (2) as the fulcrum. The fixed support (2) is a cavity structure, a plurality of compression springs (5) are uniformly arranged in the cavity, and a plurality of through holes are formed in one end of the fixed support (2) located at the dovetail tenon (21) for the compression springs (5) to extend out, so that the compression springs (5) always press the deformation template (1); an L-shaped connecting plate (22) is fixedly arranged on the back of the fixed support (2), one end of the steel strip (31) provided with the bending part (311) is arranged in the L-shaped connecting plate (22), the steel strip (31) is rotatably arranged on the horizontal section of the L-shaped connecting plate (22) through a threaded cylindrical pin (6) and a nut, and a gap is arranged between the vertical section of the L-shaped connecting plate (22) and the steel strip (31) to prevent interference between the steel strip (31) and the vertical section of the L-shaped connecting plate (22) when the steel strip (31) rotates and pushes the fixed support (2); One end of the steel strip (31) provided with the first through hole (312) should extend to the outside of the T-shaped beam web (A) to facilitate tensioning of the steel strand (32) through external force to apply prestress to the T-shaped beam web (A).

2. The device for reinforcing a reinforced concrete T-beam bridge according to claim 1, characterized by, The deformation template (1) is integrally formed and is made of low-carbon steel, and the thickness of the deformation template (1) is unevenly arranged. The thickness of the bottom plate is 5-8 mm; the thickness of the area where the fixed support (2) is arranged in the two side plates is greater than or equal to 50 mm; and the thickness of the remaining area in the two side plates is 12-16 mm.

3. The device for reinforcing a reinforced concrete T-beam bridge according to claim 1, characterized by, The thickness of the steel plate strip (31) is greater than or equal to 50 mm; the diameter of the steel strand (32) is greater than or equal to 12 mm; and the fixed anchor (33) is a JM-type anchor, an XM-type anchor or a pier head anchor.

4. The device for reinforcing a reinforced concrete T-beam bridge according to claim 1, characterized by A plurality of second through holes (12) are arranged on the two side plates of the deformation formwork (1) at intervals, and the plurality of second through holes (12) are arranged in at least two rows on each side plate; corresponding blind holes are arranged on the T-shaped beam web (A) along the longitudinal direction of the beam bridge, and the number and position of the blind holes correspond to those of the second through holes (12); the deformation formwork (1) is fixed on the T-shaped beam web (A) by high-strength fasteners (4), and after being fixed, cement mortar is poured in the gap between the deformation formwork (1) and the T-shaped beam web (A), and epoxy protective paint is applied to the outer surface of the deformation formwork (1).

5. A construction method of the reinforcing device for the reinforced concrete T-shaped beam bridge according to any one of claims 1 to 4, characterized by, The construction method comprises the following steps: Step one: clean the T-shaped beam web (A) of the reinforced concrete T-shaped beam bridge to be reinforced, and then open blind holes for fixing the deformation formwork (1) on the two sides of the T-shaped beam web (A), and then use epoxy resin adhesive to repair the concrete falling and cracks on the T-shaped beam web (A); Step two: apply epoxy resin adhesive to the inner side of the deformation formwork (1), then lift the deformation formwork (1) to the predetermined installation position of the T-shaped beam web (A), install the fixed support (2) at the corresponding position of the two side plates of the deformation formwork (1), and the fixed support (2) is connected with the clamping mechanism (3) on the back surface, and finally the clamping mechanism (3) is used to push the fixed support (2) to drive the two side plates of the deformation formwork (1) to the T-shaped beam web (A) to apply prestress to the T-shaped beam web (A); Step three: finally, the deformation formwork (1) is fixedly connected with the T-shaped beam web (A) by the fasteners (4), and after the fixed connection, cement mortar is poured in the gap between the deformation formwork (1) and the T-shaped beam web (A), and epoxy protective paint is applied to the outer surface of the deformation formwork (1).

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