Bridge reinforcing structure

Abstract

The utility model discloses a bridge reinforcing structure, which belongs to the technical field of bridge reinforcement, is arranged on a concrete T-beam and comprises a reinforcing mesh, a UHPC thin layer and a plurality of prestressed bars, the reinforcing mesh is arranged on the web surface of the concrete T-beam and the bottom end surface of the concrete T-beam, the prestressed bars are fixedly connected with the reinforcing mesh, and the UHPC thin layer is arranged in the reinforcing mesh. The prestressed bars are located on the side edge of a web of the concrete T beam, the reinforcing mesh and the prestressed bars are wrapped by the UHPC thin layer, traditional prestressed tendons are replaced with the prestressed bars, the construction technology is simple, the number of procedures is small, the tensile strength of a bridge can be effectively improved, deformation caused by part of external loads can be offset, and deflection and crack development are reduced; the UHPC thin layer is used for replacing common concrete, so that the dead weight of the bridge is slightly increased, and the thickness is slightly increased; the reinforcing mesh, the prestressed bars and the UHPC thin layer are combined, joint stress is facilitated, the bearing capacity and rigidity are remarkably improved, the construction process can be optimized, and durability is enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge reinforcement, in particular to a bridge reinforcement structure. Background Art

[0002] Bridges play a crucial role in contemporary road engineering. Many concrete bridges are affected by various factors during long-term operation, such as environmental erosion, traffic loads, and material aging. These factors may cause damage and cracks in the bridges. Therefore, reinforcement and strengthening projects for old concrete bridges have become crucial. Among these bridges, concrete T-beams are particularly common. They are often prone to structural problems such as web cracking, which requires us to take effective reinforcement measures to enhance their structural integrity and bearing capacity. Based on the damage assessment results of concrete T-beams, targeted reinforcement plans are designed, such as: increasing the cross-section, gluing steel plates, using fiber composite materials, external prestressing reinforcement, changing the structural system, and other methods.

[0003] Among them, the increased cross-section method may occupy more space, affecting the surrounding environment or other structures, requiring the demolition of the original structure, making construction more difficult and prolonging the construction period. The increased concrete weight may also place an additional burden on the substructure. In the steel plate bonding method, poor bonding or adhesive failure due to environmental factors (such as humidity and temperature changes) may reduce the reinforcement effect. The different thermal expansion coefficients between steel and concrete may cause interfacial delamination during temperature changes. In the fiber composite material method, compared with traditional materials, the material cost and construction expenses are generally higher, requiring professional personnel to operate, and improper construction may lead to performance degradation. In the external prestressing reinforcement method, installation requires precise construction technology, which may increase the construction difficulty. The external prestressing equipment (such as anchors and steel strands) may occupy a large space and affect the surrounding environment. The structural system modification method often requires re-detailed design and calculation, increasing the complexity and workload of the project. If it involves demolishing or rebuilding part of the structure, the construction time will be significantly extended, which may affect the use function. Modifying the entire structure usually means higher material and labor costs, which is less economical than other reinforcement methods.

[0004] In summary, the prior art lacks a bridge reinforcement structure that can minimally increase the deadweight of the bridge, simplify construction, and improve the overall shear and crack resistance of the bridge. Utility Model Content

[0005] In order to solve the problems of large increase in bridge deadweight and complex construction in existing bridge reinforcement methods, the utility model provides a bridge reinforcement structure which can increase the deadweight of the bridge less, simplify construction and improve the overall shear and crack resistance of the bridge.

[0006] The technical solution of the utility model is:

[0007] The utility model discloses a bridge reinforcement structure, which is arranged on a concrete T-beam and comprises a steel mesh, a UHPC thin layer and a plurality of prestressed rods. The steel mesh is arranged on the web surface and the bottom end surface of the concrete T-beam, the prestressed rods are fixedly connected to the steel mesh, and the prestressed rods are located on the side of the web of the concrete T-beam, and the UHPC thin layer wraps the steel mesh and the prestressed rods.

[0008] Furthermore, the prestressed rod includes a reaction rod, a hollow tube, a head end locking piece, an end locking piece and an adjusting piece. The reaction rod is inserted into the hollow tube, the end locking piece is detachably connected to one end common to the reaction rod and the hollow tube, the adjusting piece is detachably connected to the other end common to the reaction rod and the hollow tube, the head end locking piece is arranged on one side of the adjusting piece, and the head end locking piece is detachably arranged on the outer wall of the hollow tube.

[0009] Furthermore, the adjusting member includes a sleeve nut, a spacer and a sleeve plug, the sleeve nut is detachably connected to the hollow tube, one end of the spacer abuts the other end of the reaction rod, one end of the sleeve plug abuts the other end of the spacer, and the sleeve plug is threadedly engaged with the sleeve nut.

[0010] Furthermore, the head-end locking piece includes a fixing nut, a gasket and a high-strength nut. The fixing nut is arranged on one side of the adjusting piece. When the adjusting piece is removed, the high-strength nut can be detachably connected to the other end of the reaction rod. The gasket is arranged between the fixing nut and the high-strength nut.

[0011] Furthermore, a spiral rib is provided on one side of the end locking piece and the fixing nut, and the spiral rib is sleeved on the outer wall of the hollow tube.

[0012] Furthermore, both ends of the reaction rod are provided with threads, the outer wall of the hollow tube is threaded, the inner wall of the end locking piece is provided with threads, and the end locking piece is threadedly matched with the threads at one end of the reaction rod and the threaded outer wall of one end of the hollow tube respectively, and the high-strength nut is threadedly matched with the threads at the other end of the reaction rod.

[0013] Furthermore, pads are provided on the oppositely disposed surfaces of the end locking piece and the fixing nut.

[0014] Furthermore, a plurality of installation positions are provided on the top of the concrete T-beam, and the prestressed rods are correspondingly arranged below the installation positions.

[0015] The beneficial effects of the present invention are:

[0016] Using prestressed rods to replace traditional prestressed tendons has a simple construction process and requires fewer steps. It can effectively improve the tensile strength of the bridge, offset some of the deformation caused by external loads, and reduce the development of deflection and cracks. UHPC thin layers replace ordinary concrete, which has a small increase in the bridge's own weight and thickness. The combination of steel mesh, prestressed rods and UHPC thin layers is conducive to shared force, significantly improving the bearing capacity and stiffness, and can also optimize the construction process and enhance durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a bridge reinforcement structure of the present invention omitting the UHPC thin layer;

[0018] Figure 2 This is a schematic diagram of the structure of a UHPC thin layer wrapped steel mesh and prestressed rods in a bridge reinforcement structure of the utility model;

[0019] Figure 3 for Figure 1 Schematic diagram of the front structure;

[0020] Figure 4 This is a structural schematic diagram of a prestressed rod of a bridge reinforcement structure according to the present invention;

[0021] Figure 5 for Figure 4 Schematic diagram of the cross-section structure;

[0022] Figure 6 for Figure 5 An enlarged structural diagram of the head end;

[0023] Figure 7 for Figure 5 An enlarged structural diagram of the installation of a gasket and high-strength nuts after removing the adjusting parts;

[0024] Figure numerals: 1. Concrete T-beam, 11. Mounting position, 2. Steel mesh, 3. UHPC thin layer, 4. Prestressed rod, 41. Reaction rod, 42. Hollow tube, 43. Head end locking piece, 431. Fixing nut, 432. Pad, 433. High-strength nut, 44. End locking piece, 45. Adjusting piece, 451. Sleeve nut, 452. Spacer, 453. Casing plug, 46. Spiral reinforcement, 47. Pad. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] It should be noted that when a component is referred to as being "installed on", "provided on", "covered on", "sleeved on", or "locked on" another component, it can be directly on the other component or indirectly on the other component.

[0027] It should be understood that, in the description of the present invention, “several” means two or more than two, unless otherwise clearly and specifically defined.

[0028] In addition, the terms "inside", "upper", "between", "both sides", "one side", "top", "bottom", "side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0029] It should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature designated as "first," "second," "third," etc. may explicitly or implicitly include one or more of such features.

[0030] It should be noted that the term "and / or" in this document merely describes an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. A and B can each be singular or plural.

[0031] Please refer to Figure 1-Figure 7 The present invention provides a bridge reinforcement structure, which is arranged on a concrete T-beam 1, and includes a steel mesh 2, a UHPC thin layer 3 and a plurality of prestressed rods 4. The steel mesh 2 is arranged on the web surface of the concrete T-beam 1 and the bottom end surface of the concrete T-beam 1, and the prestressed rods 4 are fixedly connected to the steel mesh 2, and the prestressed rods 4 are located on the side of the web of the concrete T-beam 1. The UHPC thin layer 3 wraps the steel mesh 2 and the prestressed rods 4, and the prestressed rods 4 are used to replace traditional prestressed tendons. The construction process is simple and the number of steps is small, which can effectively improve the tensile strength of the bridge, offset the deformation caused by part of the external load, and reduce the development of deflection and cracks; the UHPC thin layer 3 replaces ordinary concrete, which has a small increase in the self-weight of the bridge and a small increase in thickness; the combination of the steel mesh 2, the prestressed rods 4 and the UHPC thin layer 3 is conducive to joint force, significantly improves the bearing capacity and stiffness, and can also optimize the construction process and enhance durability.

[0032] Preferably, a plurality of installation positions 11 are provided on the top of the concrete T-beam 1 , and the prestressed rods 4 are correspondingly arranged below the installation positions 11 .

[0033] Specifically, the prestressed rod 4 includes a reaction rod 41, a hollow tube 42, a head end locking piece 43, an end locking piece 44 and an adjusting piece 45. The reaction rod 41 is inserted into the hollow tube 42, and the end locking piece 44 is detachably connected to one end of the reaction rod 41 and the hollow tube 42. The adjusting piece 45 is detachably connected to the other end of the reaction rod 41 and the hollow tube 42. The head end locking piece 43 is arranged on one side of the adjusting piece 45, and the head end locking piece 43 is detachably arranged on the outer wall of the hollow tube 42.

[0034] The adjusting member 45 includes a sleeve nut 451, a spacer 452 and a sleeve plug 453. The sleeve nut 451 is detachably connected to the hollow tube 42. One end of the spacer 452 abuts against the other end of the reaction rod 41. One end of the sleeve plug 453 abuts against the other end of the spacer 452. The sleeve plug 453 is threadedly engaged with the sleeve nut 451.

[0035] The head-end locking member 43 includes a fixing nut 431, a pad 432 and a high-strength nut 433. The fixing nut 431 is arranged on one side of the adjusting member 45. When the adjusting member 45 is removed, the high-strength nut 433 can be detachably connected to the other end of the reaction rod 41. The pad 432 is arranged between the fixing nut 431 and the high-strength nut 433.

[0036] A spiral rib 46 is provided on one side of the end locking piece 44 and the fixing nut 431, and the spiral rib 46 is sleeved on the outer wall of the hollow tube 42. When pouring concrete, the spiral rib 46 can increase the contact surface of the concrete and prevent the two ends from cracking after stress release.

[0037] Both ends of the reaction rod 41 are provided with threads, the outer wall of the hollow tube 42 is threaded, and the inner wall of the end locking piece 44 is provided with threads. The end locking piece 44 is threadedly engaged with the threads at one end of the reaction rod 41 and the threaded outer wall at one end of the hollow tube 42 respectively, and the high-strength nut 433 is threadedly engaged with the threads at the other end of the reaction rod 41.

[0038] The end locking piece 44 and the fixing nut 431 are provided with a backing plate 47 on the opposite surfaces thereof. The end locking piece 44 and the fixing nut 431 are integrally cast with the backing plate 47 , and the backing plate 47 is fixedly connected to the spiral rib 46 .

[0039] The prestressed rod 4 works in conjunction with a tensioning platform equipped with a jack. The working principle of the prestressed rod 4 is: after the sleeve plug 453 is screwed inward and the sleeve plug 453 presses against the pad 452, the jack is made to work in reverse to move the reaction rod 41 toward the end locking piece 44. At this time, the sleeve plug 453 and the sleeve nut 451 are tightened to prevent the reaction rod 41 from retracting, and its prestress is locked and stored in the prestressed rod 4; when the hollow tube 42 storing prestress is installed in the concrete structure, when the predetermined strength is reached, the locking sleeve nut 451 is released, and its prestress is released in the concrete structure to form a prestressed structure.

[0040] The following are the construction steps of the utility model bridge reinforcement structure:

[0041] 1) Use a steel bar positioning device to determine the position of the steel bars or the position of the steel strands in the concrete T-beam 1 to facilitate avoidance during drilling;

[0042] 2) Drill holes on the top of the concrete T-beam 1 to form several installation positions 11;

[0043] 3) Thoroughly roughen the inner wall of the installation position 11, the web surface of the concrete T-beam 1, and the bottom end surface of the concrete T-beam 1;

[0044] 4) Arrange the steel mesh 2 on the web surface of the concrete T-beam 1 and the bottom end surface of the concrete T-beam 1, pour epoxy resin glue into the installation position 11, and then plant the steel bars;

[0045] 5) A tensioning platform with a through-hole jack is set above the installation position 11, and a prestressed rod 4 is tied and placed at the corresponding position below the installation position 11, and the prestressed rod 4 is connected to the steel mesh 2 on the side of the web of the concrete T-beam 1. The end locking piece 44 of the prestressed rod 4 is tightened, and the head end locking piece 43 and the adjusting piece 45 of the prestressed rod 4 are not fixed. The unfixed end of the prestressed rod 4 is connected to the through-hole jack, and the through-hole jack transmits the prestress of the jack through the pad 452, pushing the reaction rod 41 to be compressed, and then the reaction force is applied to the hollow tube 42 through the end locking piece 44. The sleeve plug 453 and the sleeve nut 451 are tightened, and the prestress is locked and stored in the prestressed rod 4;

[0046] 6) Forming a formwork on the web surface of the concrete T-beam 1 and the bottom end of the concrete T-beam 1 to form a pouring hole, and then pouring UHPC into the pouring hole to form a UHPC thin layer 3;

[0047] 7) After the UHPC thin layer 3 reaches a predetermined strength, the formwork is removed, the sleeve nut 451 and the sleeve plug 453 are loosened, and the prestress stored in the prestressed rod 4 is released. The prestress is released in the concrete structure to form a prestressed structure;

[0048] 8) Remove the locking sleeve nut 451, the spacer 452, and the sleeve plug 453, and put the pad 432 on the reaction rod 41. The pad 432 is tightly attached to the fixing nut 431, and then screw in the high-strength nut 433;

[0049] 9) Use a through-hole jack to tension the reaction rod 41. Since the bottom end of the reaction rod 41 is connected to the end locking piece 44, after reaching the predetermined strength, the outer wall will further shrink, providing stronger prestress to the concrete. Tighten the high-strength nut 433.

[0050] 10) Remove the tensioning platform with through-hole jacks to complete the reinforcement of the bridge.

[0051] The above-described embodiment merely represents one embodiment of the present invention. While the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A bridge reinforcement structure, which is provided on a concrete T-beam (1), characterized in that: The invention comprises a steel mesh (2), a UHPC thin layer (3) and a plurality of prestressed rods (4), wherein the steel mesh (2) is arranged on the web surface of a concrete T-beam (1) and the bottom end surface of the concrete T-beam (1), the prestressed rods (4) are fixedly connected to the steel mesh (2), and the prestressed rods (4) are located on the side of the web of the concrete T-beam (1), and the UHPC thin layer (3) wraps the steel mesh (2) and the prestressed rods (4).

2. The bridge reinforcement structure according to claim 1, characterized in that: The prestressed rod (4) comprises a reaction rod (41), a hollow tube (42), a head end locking piece (43), a terminal locking piece (44) and an adjusting piece (45); the reaction rod (41) is inserted into the hollow tube (42); the terminal locking piece (44) is detachably connected to a common end of the reaction rod (41) and the hollow tube (42); the adjusting piece (45) is detachably connected to a common other end of the reaction rod (41) and the hollow tube (42); the head end locking piece (43) is arranged on one side of the adjusting piece (45), and the head end locking piece (43) is detachably arranged on the outer wall of the hollow tube (42).

3. The bridge reinforcement structure according to claim 2, characterized in that: The adjusting member (45) comprises a sleeve nut (451), a spacer (452) and a sleeve plug (453); the sleeve nut (451) is detachably connected to the hollow tube (42); one end of the spacer (452) abuts against the other end of the reaction rod (41); one end of the sleeve plug (453) abuts against the other end of the spacer (452); and the sleeve plug (453) is threadedly engaged with the sleeve nut (451).

4. The bridge reinforcement structure according to claim 3, characterized in that: The head end locking member (43) comprises a fixing nut (431), a cushion layer (432) and a high-strength nut (433); the fixing nut (431) is arranged on one side of the adjusting member (45); when the adjusting member (45) is disassembled, the high-strength nut (433) can be detachably connected to the other end of the reaction rod (41); and the cushion layer (432) is arranged between the fixing nut (431) and the high-strength nut (433).

5. The bridge reinforcement structure according to claim 4, characterized in that: A spiral rib (46) is provided on one side of the end locking piece (44) and the fixing nut (431), and the spiral rib (46) is sleeved on the outer wall of the hollow tube (42).

6. The bridge reinforcement structure according to claim 5, characterized in that: Both ends of the reaction rod (41) are provided with threads, the outer wall of the hollow tube (42) is threaded, the inner wall of the end locking piece (44) is provided with threads, the end locking piece (44) is threadedly matched with the threads at one end of the reaction rod (41) and the threaded outer wall at one end of the hollow tube (42), respectively, and the high-strength nut (433) is threadedly matched with the threads at the other end of the reaction rod (41).

7. The bridge reinforcement structure according to claim 6, characterized in that: Pads (47) are provided on the opposing surfaces of the end locking piece (44) and the fixing nut (431).

8. The bridge reinforcement structure according to claim 1, characterized in that: A plurality of installation positions (11) are provided on the top of the concrete T-beam (1), and the prestressed rods (4) are correspondingly arranged below the installation positions (11).

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