Reinforcing structure for reinforcing old concrete T beam by using UHPC (Ultra High Performance Concrete)

Abstract

The utility model discloses a reinforcing structure utilizing UHPC to reinforce an old concrete T beam, which comprises a prefabricated steel member, the prefabricated steel member comprises a bottom steel plate, a left side steel plate and a right side steel plate, the bottom steel plate, the left side steel plate and the right side steel plate jointly enclose a U-shaped groove, a plurality of short steel nails which are arranged at intervals are fixedly installed on the top surface of the bottom steel plate, and the bottom steel plate is fixedly connected with the U-shaped groove. The left steel plate and the right steel plate are each provided with a plurality of round holes arranged at intervals. Compared with the prior art, the old concrete T beam is reinforced by manufacturing the prefabricated steel member, the steel plate of the prefabricated steel member serves as a formwork, and the UHPC pouring process can be more convenient and efficient. Meanwhile, the steel plates serve as reinforcing layer steel bars, and the bearing capacity of the old concrete T beam is enhanced. According to the technology, the working procedures of on-site formwork erecting, reinforcing steel bar binding and the like can be reduced, rapid assembly type construction is achieved, construction time consumption is shortened, on-site working procedures are simplified, and good economic benefits are achieved.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a reinforcement structure for reinforcing old concrete T-beams using UHPC. Background Technology

[0002] In the field of bridge repair, T-beams are the most common type of repair. Existing methods for repairing T-beams mainly include increasing the cross-section, bonding channel steel plates, using fiber composite materials, external prestressing reinforcement, and changing the structural system.

[0003] Enlarging the cross-section is the most common method in T-beam repair. It mainly uses ordinary concrete to increase the cross-section of the T-beam, thereby achieving the purpose of strengthening. However, using ordinary concrete will lead to a significant increase in the self-weight of the bridge, while the increase in cross-sectional strength and ductility is not significant, resulting in poor strengthening effect.

[0004] In addition, UHPC is a cement-based composite material with excellent performance. Through optimized material composition and processing, it excels in strength, durability, and construction flexibility. UHPC has extremely high compressive and flexural strength, typically two to three times that of traditional concrete, enabling it to withstand greater loads and deformations. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a reinforcement structure for reinforcing old concrete T-beams using UHPC. This reinforcement structure strengthens the old concrete T-beams by using precast steel components and UHPC to reinforce them, thereby improving the structural strength of the old concrete T-beams and solving the problem of poor reinforcement strength in the past.

[0006] To solve the above-mentioned technical problems, this utility model discloses a reinforcement structure for reinforcing old concrete T-beams using UHPC, including prefabricated steel components. The prefabricated steel components include a bottom steel plate, a left steel plate, and a right steel plate. The left and right steel plates are respectively vertically fixed to the left and right sides of the bottom steel plate, so that the bottom steel plate, the left steel plate, and the right steel plate together form a U-shaped groove. Multiple short steel nails arranged at intervals are fixedly installed on the top surface of the bottom steel plate. Multiple round holes arranged at intervals are opened on both the left and right steel plates. In the reinforced state, the bottom end of the old concrete T-beam is inserted into the U-shaped groove, and the bottom surface of the old concrete T-beam abuts against the top surface of each short steel nail. UHPC is poured between the groove wall of the U-shaped groove and the old concrete T-beam, and between the bottom of the U-shaped groove and the old concrete T-beam.

[0007] Multiple short steel nails are arranged in a matrix on the top surface of the bottom steel plate.

[0008] The short steel nails are arranged in at least two vertical columns and spaced apart along the width of the bottom steel plate. Each short steel nail in each column is spaced apart along the length of the bottom steel plate.

[0009] The short steel nails in adjacent columns are staggered so that the short steel nails in one column are located between two adjacent short steel nails in another column.

[0010] Multiple circular holes are arranged in a matrix on the left steel plate.

[0011] The multiple round holes are divided into at least two vertical columns and are arranged at intervals along the width direction of the left steel plate, and each round hole in each vertical column is arranged at intervals along the length direction of the left steel plate.

[0012] The holes in adjacent columns are staggered so that the holes in one column are located between two adjacent holes in another column.

[0013] The system also includes multiple expansion bolts. The bottom of the old concrete T-beam has multiple mounting holes that are axially aligned with the circular holes. Each expansion bolt includes a shank and a nut. One end of the shank of the expansion bolt is inserted into the mounting hole of the old concrete T-beam through the circular hole on the side of the precast steel component. The nut is threaded to the other end of the shank of the expansion bolt so that part of the shank is located inside the old concrete T-beam, and the nut is located on the outer side of the precast steel component.

[0014] Compared with the prior art, the embodiments of this utility model have the following beneficial effects:

[0015] (1) Precast steel components are used to reinforce the old concrete T-beams. UHPC is used to fix the precast steel components to the old concrete T-beams. Compared with the previous reinforcement method using ordinary concrete, it has a smaller increase in the self-weight of the bridge and a smaller increase in thickness. The overall stress performance and bending performance after reinforcement are better, which solves the problem of poor reinforcement strength in the past.

[0016] (2) The overall structure is simple and compact. By adding short steel nails to the inner bottom surface of the precast steel component, a gap is formed between the old concrete T-beam and the inner bottom surface of the precast steel component, which allows the UHPC fluid to enter the gap, further improving the bonding stability between the precast steel component and the old concrete T-beam, enhancing the overall structural strength, and solving the problem of low bonding strength in the past.

[0017] (3) In other embodiments, after the old concrete T-beam is roughened and drilled, expansion bolts are used to fix the precast steel components to the old concrete T-beam. Before pouring the UHPC, the expansion bolts can temporarily fix the precast steel components to the old concrete T-beam. Then the UHPC is poured. After the UHPC is cured, the expansion bolts are embedded in the old concrete T-beam, forming an integral whole with the old T-beam. The expansion bolts can strengthen the old concrete T-beam, avoiding the cumbersome process of rebar installation. The cured overall structure has superior bending and crack resistance, and its load-bearing capacity is significantly improved compared with other reinforcement measures. The construction is also simpler and more applicable in engineering practice. It reduces the on-site formwork and rebar tying processes, realizes prefabricated construction, shortens construction time, simplifies on-site procedures, and has good economic benefits. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the prefabricated steel component in this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the steel plate on the left side in this utility model;

[0021] Figure 3 This is a top view of the prefabricated steel component in this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the present invention after the reinforcement structure conceals the UHPC;

[0023] Figure 5 This is a schematic diagram of the reinforcement structure in this utility model;

[0024] Figure 6 This is a structural schematic diagram of the reinforcement structure from another perspective in this utility model;

[0025] Figure 7 This is a partial structural diagram of the reinforcement structure in this utility model. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] This utility model discloses a specific implementation method for a reinforcement structure using UHPC to reinforce old concrete T-beams. Please see [link to implementation details]. Figures 1 to 6 As shown, the system includes a prefabricated steel component 1, which comprises a bottom steel plate 11, a left steel plate 12, and a right steel plate 13. The left steel plate 12 and the right steel plate 13 are respectively vertically fixed to the left and right sides of the bottom steel plate 11, so that the bottom steel plate 11, the left steel plate 12, and the right steel plate 13 together form a U-shaped groove 14. It should be noted that the bottom steel plate 11, the left steel plate 12, and the right steel plate 13 can be an integrally formed structure, formed by casting or sheet metal bending, or they can be fixedly connected by welding.

[0030] As an improvement, multiple short steel nails 2 arranged at intervals are fixedly installed on the top surface of the bottom steel plate 11, and multiple round holes 15 arranged at intervals are opened on both the left steel plate 12 and the right steel plate 13. In the reinforced state, the bottom end of the old concrete T-beam 3 is inserted into the U-shaped groove 14, and the bottom surface of the old concrete T-beam 3 abuts against the top surface of each short steel nail 2, so that a gap is formed between the bottom surface of the old concrete T-beam and the inner bottom surface of the U-shaped groove 14. UHPC is poured between the groove wall of the U-shaped groove 14 and the old concrete T-beam 3, and between the groove bottom of the U-shaped groove 14 and the old concrete T-beam 3, so that a thin layer of UHPC 4 is formed between the precast steel component 1 and the old concrete T-beam. This reinforcement method has a simple and compact overall structure. By adding short steel nails 2 to the inner bottom surface of the precast steel component 1, a gap is formed between the old concrete T-beam 3 and the inner bottom surface of the precast steel component 1, allowing the fluid UHPC to enter the gap, thereby further improving the bonding stability between the precast steel component 1 and the old concrete T-beam 3, enhancing the overall structural strength, and solving the problem of low bonding strength in the past.

[0031] Please see Figure 3 Multiple short steel nails 2 are arranged in a matrix on the top surface of the bottom steel plate 11. Specifically, the multiple short steel nails 2 are divided into at least two vertical columns and arranged at intervals along the width direction of the bottom steel plate 11, and each short steel nail 2 in each vertical column is arranged at intervals along the length direction of the bottom steel plate 11. In addition, the short steel nails 2 in adjacent vertical columns are staggered, so that the short steel nails 2 in one vertical column are located between two adjacent short steel nails 2 in another vertical column. This staggered structure facilitates the integration of UHPC with prefabricated steel components 1.

[0032] Please see Figure 2 Multiple circular holes 15 are arranged in a matrix on the left steel plate 12. Specifically, the multiple circular holes 15 are divided into at least two vertical columns and are spaced apart along the width direction of the left steel plate 12, while the circular holes 15 in each vertical column are spaced apart along the length direction of the left steel plate 12. In addition, the circular holes 15 in adjacent vertical columns are staggered, so that the circular holes 15 in one vertical column are located between two adjacent circular holes 15 in another vertical column. This staggered structure facilitates subsequent reinforcement processes and makes it easier to combine the UHPC with the precast steel component 1. It should be noted that the structure of the left steel plate 12 is similar to that of the right steel plate 13, and the two are mirror images of each other.

[0033] Combination Figures 4 to 7The reinforcement structure also includes multiple expansion bolts 41. The bottom of the old concrete T-beam 3 is provided with multiple mounting holes aligned axially with the round hole 15. The expansion bolt 41 includes a shank and a nut. One end of the shank of the expansion bolt 41 is inserted into the mounting hole of the old concrete T-beam through the round hole 15 on the side of the precast steel component 1. The nut 42 is threaded to the other end of the shank of the expansion bolt 41 so that part of the shank is located inside the old concrete T-beam (an expansion sleeve is provided on the outer periphery of the shank, and the expansion sleeve is located in the mounting hole). The nut 42 is located on the outer side of the precast steel component 1.

[0034] The working process of a reinforcement structure using UHPC to reinforce an old concrete T-beam in this embodiment is as follows: First, a precast steel component 1 is fabricated. A steel plate is selected and designed into a U-shape to form a channel-shaped steel plate. The channel-shaped steel plate acts as a template, making the UHPC pouring process more convenient and efficient. At the same time, the channel-shaped steel plate also acts as reinforcing steel, which can strengthen the old concrete T-beam. Two vertical rows of short steel nails 2 are evenly welded on the inner bottom surface of the channel-shaped steel plate (the top surface of the bottom steel plate 11). The short steel nails 2 in adjacent vertical rows are staggered so that the UHPC can be better connected to them. In addition, two vertical rows of round holes 15 are evenly opened on both sides of the channel-shaped steel plate (left steel plate 12 and right steel plate 13).

[0035] The second step is to roughen the lower end of the web of the old concrete T-beam 3, drill corresponding mounting holes at the bottom of the old concrete T-beam 3 according to the circle of the precast steel component 1, erect the precast steel component 1 to the bottom of the T-beam, install expansion bolts through the circular holes 15 of the precast steel component 1 and the mounting holes of the T-beam, and use washers and nuts 42 to temporarily fix the precast steel component 1 to the old concrete T-beam 3. Before pouring UHPC, the expansion bolts can temporarily fix the precast steel component to the old concrete T-beam.

[0036] The third step is to pour UHPC inside the precast steel component 1 so that a thin layer of UHPC 4 is formed between the precast steel component 1 and the old concrete T-beam 3. After the UHPC has cured, the reinforcement of the old concrete T-beam is completed.

[0037] This embodiment describes a reinforcement structure using UHPC to strengthen an old concrete T-beam. A precast steel component 1 is used to reinforce the old concrete T-beam 3. UHPC is then used to fix the precast steel component 1 to the old concrete T-beam 3. Compared to previous reinforcement methods using ordinary concrete, this method results in a smaller increase in the bridge's self-weight and thickness, and provides better overall load-bearing capacity and bending resistance, solving the problem of poor reinforcement strength in previous methods. After the old concrete T-beam is roughened and drilled, expansion bolts are used to fix the precast steel component to the old concrete T-beam. Before pouring the UHPC, the expansion bolts provide temporary fixation between the precast steel component and the old concrete T-beam. Then, the UHPC is poured. After the UHPC cures, the expansion bolts are embedded in the old concrete T-beam, forming a unified structure. Expansion bolts can reinforce old concrete T-beams, avoiding the cumbersome process of rebar installation. The cured structure has superior bending and crack resistance, significantly improving load-bearing capacity compared to other reinforcement measures. Construction is also simpler, making it more applicable in engineering practice. It reduces on-site formwork erection and rebar tying, enabling prefabricated construction, shortening construction time, simplifying on-site procedures, and providing good economic benefits.

[0038] Finally, it should be noted that the reinforcement structure for reinforcing old concrete T-beams using UHPC disclosed in this utility model embodiment is only a preferred embodiment of this utility model and is used only to illustrate the technical solution of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A reinforcement structure for strengthening old concrete T-beams using UHPC, characterized in that, The device includes a precast steel component, which comprises a bottom steel plate, a left steel plate, and a right steel plate. The left and right steel plates are respectively vertically fixed to the left and right sides of the bottom steel plate, so that the bottom steel plate, the left steel plate, and the right steel plate together form a U-shaped groove. A plurality of short steel nails are fixedly installed on the top surface of the bottom steel plate, and a plurality of round holes are provided on both the left and right steel plates. In the reinforced state, the bottom end of the old concrete T-beam is inserted into the U-shaped groove, the bottom surface of the old concrete T-beam abuts against the top surface of each of the short steel nails, and UHPC is poured between the groove wall of the U-shaped groove and the old concrete T-beam, as well as between the bottom of the U-shaped groove and the old concrete T-beam.

2. The reinforcement structure for reinforcing old concrete T-beams using UHPC according to claim 1, characterized in that, The short steel nails are arranged in a matrix on the top surface of the bottom steel plate.

3. The reinforcement structure for reinforcing old concrete T-beams using UHPC according to claim 2, characterized in that, The short steel nails are divided into at least two vertical columns and are spaced apart along the width direction of the bottom steel plate, and each of the short steel nails in each vertical column is spaced apart along the length direction of the bottom steel plate.

4. The reinforcement structure for reinforcing old concrete T-beams using UHPC according to claim 3, characterized in that, The short steel nails in two adjacent columns are staggered so that the short steel nails in one column are located between two adjacent short steel nails in the other column.

5. The reinforcement structure for reinforcing old concrete T-beams using UHPC according to claim 1, characterized in that, The plurality of the circular holes are arranged in a matrix on the left side steel plate.

6. A reinforcement structure for reinforcing old concrete T-beams using UHPC according to claim 5, characterized in that, The plurality of circular holes are divided into at least two vertical columns and are spaced apart along the width direction of the left steel plate, and each of the circular holes in each vertical column is spaced apart along the length direction of the left steel plate.

7. A reinforcement structure for reinforcing old concrete T-beams using UHPC according to claim 6, characterized in that, The holes in two adjacent columns are staggered so that the holes in one column are located between two adjacent holes in the other column.

8. A reinforcement structure for reinforcing old concrete T-beams using UHPC according to claim 1, characterized in that, It also includes multiple expansion bolts. The bottom of the old concrete T-beam has multiple mounting holes that are axially aligned with the circular hole. The expansion bolt includes a shank and a nut. One end of the shank of the expansion bolt is inserted into the mounting hole of the old concrete T-beam through the circular hole on the side of the precast steel component. The nut is threaded to the other end of the shank of the expansion bolt so that part of the shank is located inside the old concrete T-beam and the nut is located on the outer side of the precast steel component.

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