Bridge multi-point dispersed external prestressed prefabricated module reinforcement device and reinforcement method

Abstract

The present invention provides a multi-point dispersed external prestressed prefabricated module reinforcement device for bridges and a reinforcement method thereof. The device comprises: a prefabricated steering member, the prefabricated steering member being arranged at a turning point of the bridge to be reinforced, with a plurality of dispersed anchoring points arranged on opposite sides of the turning point; a plurality of prefabricated anchors, the prefabricated anchors being arranged at the anchoring points; a wet joint, the wet joint being formed between the prefabricated anchors and the prefabricated steering member and the bridge to be reinforced, wherein concrete is poured into the wet joint; and a plurality of dispersed external prestressed cables, the dispersed external prestressed cables being passed through the prefabricated steering member, with the ends of the dispersed external prestressed cables being connected to the prefabricated anchors on opposite sides of the turning point. The present invention solves the problem of traditional external prestressed reinforcement methods for bridges, in which external prestressing is relatively concentrated at anchoring points or turning points, resulting in complex construction and a long construction period.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge reinforcement, and in particular to a bridge multi-point dispersed external prestressed prefabricated module reinforcement device and a reinforcement method thereof. Background Art

[0002] Long-span prestressed concrete bridges are subject to constant changes in their structural stress state due to factors such as prestressing, concrete shrinkage and creep, construction quality, and maintenance. This can lead to deflection at mid-span, and in severe cases, cracking in the web and mid-span floor. Continuous beams can also cause cracking in the top plate due to negative bending moments. Existing reinforcement methods include increasing the cross-section, gluing steel plates, CFRP (carbon fiber reinforced plastic) plates, or CFRP sheets, and various prestressing methods.

[0003] The most effective reinforcement method for these stress-induced deformations and cracks is prestressing, which can be accomplished using various materials, internal or external prestressing methods. External prestressing is the most effective, quickest, and easiest to implement compared to other prestressing methods, and is currently the most common engineering solution.

[0004] Bridges that require prestressing reinforcement are usually those with relatively large spans, and their cracking and deformation are relatively serious. When using external prestressing reinforcement, its original stress state will inevitably be affected. During the reinforcement process, in order to overcome the adverse effects of construction space and environment, and taking into account the stress, the applied prestress is usually in the form of more concentrated steering and anchoring. The problem caused is that the structural stress system is changed, and the external prestress is more concentrated at the anchor point or steering point. In order to avoid the secondary cracking problem caused by concentrated force, it is necessary to have a stronger or more complex anchoring structure or steering structure.

[0005] Furthermore, the construction space in the anchorage or deflection zones is typically relatively small, and the strong and complex anchorage or deflection structures further increase the construction difficulty. Specifically, reinforced concrete anchor blocks or plates and deflection blocks or plates are added to specific locations on the beam (for example, within the box beam), and prestressed anchors are embedded within them using prestressed anchor plates or deflection blocks. This process typically requires removing some concrete from the anchorage and deflection zones to allow the steel bars of the corresponding anchor blocks or plates and deflection blocks or plates to intersect with the existing bridge structure. Alternatively, rebar embedding is used to intersect the existing bridge structure's steel bars to transfer force to the original structure. The anchor plates or deflectors are then fixed within the steel mesh, and then formwork is installed and concrete poured. Once the concrete strength reaches the design requirements (usually within a week), prestressed cables are installed in the anchor plates and deflection blocks, and prestressing is then carried out. This specific process requirement significantly extends the construction period of the entire bridge, which is undoubtedly disadvantageous for bridges that urgently need to repair defects to restore traffic. The prestressed cables sometimes restrict working space, requiring the box girder structure to be chiseled open to install embedded steel mesh, anchor plates, or diverters, which then need to be repaired later. This complexity increases the consumption of manpower and material resources. Summary of the Invention

[0006] In order to overcome the defects of the existing technology, a multi-point dispersed external prestressed prefabricated module reinforcement device and a reinforcement method for a bridge are now provided to solve the problems of traditional external prestressed reinforcement methods for bridges, such as the external prestress is relatively concentrated at the anchor points or turning points, the construction is complicated, and the construction period is long.

[0007] To achieve the above-mentioned purpose, a multi-point dispersed external prestressed prefabricated module reinforcement device for a bridge is provided, comprising:

[0008] A prefabricated steering member, wherein the prefabricated steering member is arranged at a steering point of the bridge to be reinforced, and a plurality of dispersed anchoring points are arranged on opposite sides of the steering point;

[0009] a plurality of prefabricated anchors, wherein the prefabricated anchors are arranged at the anchor points;

[0010] Wet joints are formed between the prefabricated anchoring piece, the prefabricated steering piece and the bridge to be reinforced, respectively, and concrete is poured in the wet joints;

[0011] A plurality of dispersed external prestressed cables are provided, wherein the dispersed external prestressed cables are passed through the prefabricated turning member, and both ends of the dispersed external prestressed cables are respectively connected to the prefabricated anchoring members on opposite sides of the turning point.

[0012] Furthermore, the plurality of dispersed external prestressed cables are respectively applied with equal or similar amounts of prestress.

[0013] Furthermore, anchor bars are embedded in the prefabricated steering member, and the anchor bars extend out of the prefabricated steering member and into the wet joint. The turning point is installed with a first embedded bar, and the anchor bars are connected to the first embedded bar. The concrete covers the anchor bars and the first embedded bar.

[0014] Furthermore, anchor bars are embedded in the prefabricated anchoring member, and the anchor bars extend out of the prefabricated steering member and into the wet joint. A second anchor bar is installed at the anchor point, and the anchor bar is connected to the second anchor bar. The concrete covers the anchor bar and the second anchor bar.

[0015] Furthermore, the concrete is ultra-high performance concrete.

[0016] Furthermore, the prefabricated anchor is installed obliquely at the anchor point.

[0017] The present invention provides a reinforcement method for a bridge multi-point dispersed external prestressed prefabricated module reinforcement device, comprising the following steps:

[0018] determining a turning point of the bridge to be reinforced and a plurality of anchoring points dispersedly arranged on opposite sides of the turning point;

[0019] Arranging a prefabricated turning member at a turning point of the bridge to be reinforced, so that a wet joint is formed between the prefabricated turning member and the bridge to be reinforced;

[0020] Disposing a plurality of prefabricated anchors at a plurality of anchoring points on opposite sides of the turning point, so that wet joints are formed between the prefabricated anchors and the bridge to be reinforced;

[0021] pouring concrete into the wet joints formed between the prefabricated anchoring piece, the prefabricated deflecting piece, and the bridge to be reinforced, respectively, so that the prefabricated anchoring piece and the prefabricated deflecting piece are fixed to the bridge to be reinforced;

[0022] Passing a plurality of dispersed external prestressed cables through the prefabricated turning member, and connecting two ends of the dispersed external prestressed cables to the prefabricated anchoring members on opposite sides of the turning point;

[0023] After both ends of the dispersed external prestressed cables are connected to the prefabricated anchors, the dispersed external prestressed cables are tensioned to apply prestress to the dispersed external prestressed cables.

[0024] Furthermore, when implementing the step of tensioning the dispersed external prestressed cables to apply prestress to the dispersed external prestressed cables, equal or similar prestress is applied to the plurality of dispersed external prestressed cables.

[0025] The beneficial effects of the present invention are that the multi-point dispersed external prestressed prefabricated module reinforcement device for bridges of the present invention adopts a modular design method to simplify the design process of external prestressed reinforcement of the bridge to be reinforced; prefabricated modular structure processing is conducive to standardized prefabrication in the factory, ensuring quality while achieving cost savings; prefabricated components (prefabricated anchors and prefabricated steering parts) and embedded parts reduce possible construction deviations, thereby facilitating installation and construction, improving reinforcement construction efficiency, and shortening the construction period; the use of prefabricated installation realizes standardized installation operations and is easy to control construction quality; the use of dispersed anchoring is conducive to the stress of the existing structure of the bridge to be reinforced, avoiding concentrated force transmission that causes damage to the bridge to be reinforced or requires more structural costs. The multi-point dispersed external prestressed prefabricated module reinforcement device for bridges of the present invention realizes the rapid repair of large-span bridges with downward deflection deformation, ensures the smooth flow of traffic arteries, and not only provides bridge management units with a new idea of bridge management and maintenance, but also provides construction units with technical solutions and theoretical support, and also provides design units with design references for possible changes in the entire life of the bridge during the design process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of a multi-point dispersed external prestressed prefabricated module reinforcement device for a bridge according to an embodiment of the present invention.

[0027] Figure 2 Schematic diagram of the installation of the prefabricated anchor block according to an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the installation of a prefabricated steering block according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0030] Figure 1 This is a structural diagram of a multi-point dispersed external prestressed prefabricated module reinforcement device for a bridge according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the installation of the prefabricated anchor block in the box beam according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the installation of a prefabricated turning block in a T-beam according to an embodiment of the present invention.

[0031] Reference Figures 1 to 3As shown, the present invention provides a multi-point dispersed external prestressed prefabricated module reinforcement device for a bridge, comprising: a prefabricated steering member 2, a plurality of prefabricated anchor members 3, a wet joint a, a plurality of dispersed external prestressed cables 4 and concrete 5.

[0032] The prefabricated turning member 2 is arranged at the turning point of the bridge to be reinforced 1. A plurality of dispersed anchoring points are arranged on opposite sides of the turning point. A plurality of prefabricated anchoring members 3 are arranged in a one-to-one correspondence at the anchoring points.

[0033] The precast anchoring members 3 and precast steering members 2 form wet joints a with the bridge 1 to be reinforced. Concrete 5 is poured into the wet joints a. The wet joints can transfer steering and anchoring forces to the structure with minimal impact.

[0034] A plurality of dispersed external prestressed cables 4 are passed through the prefabricated turning member 2. Both ends of the dispersed external prestressed cables 4 are respectively connected to prefabricated anchoring members 3 on opposite sides of the turning point.

[0035] The multi-point dispersed external prestressed prefabricated modular bridge reinforcement device of the present invention is based on a multi-point dispersed external cable design concept. This shifts from the traditional design concept of primarily long, continuous cables to a design concept primarily based on short, dispersed external prestressed cables. This replaces traditional cables with centralized anchors or pivot points with dispersed external prestressed cables, reducing the negative impact of excessive localized stress on the bridge to be reinforced while also overcoming disadvantages such as limited installation space for deflectors and anchors. Because the stress state of the existing structural cross-section of the bridge to be reinforced changes due to the addition of external prestress, the anchors and deflectors of the multi-point dispersed external prestressed prefabricated modular bridge reinforcement device of the present invention, which require force adjustment, need to be dispersed or arranged in the most advantageous locations through optimized design. This ensures that the prestressing performance is fully utilized and the stability of the subsequent performance of the reinforced bridge structure is guaranteed. Precisely because the dispersed external prestressed cables are dispersed, they can more easily adapt to the stress variations along the span of the reinforced bridge structure, including the distribution of bending moment and shear force, as well as changes in the cross-sectional normal stress and principal stress direction, thus facilitating structural stress response.

[0036] The multi-point dispersed external prestressed prefabricated module reinforcement device for bridges of the present invention adopts a modular design method to simplify the design process of external prestressed reinforcement of the bridge to be reinforced; prefabricated modular structure processing is conducive to standardized prefabrication in the factory, ensuring quality while achieving cost savings; prefabricated components (prefabricated anchors and prefabricated steering parts) and embedded parts reduce possible construction deviations, thereby facilitating installation and construction; the use of prefabricated installation realizes standardized installation operations and makes it easy to control construction quality; the use of dispersed anchoring is conducive to the stress on the existing structure of the bridge to be reinforced, avoiding concentrated force transmission that causes damage to the bridge to be reinforced or requires more structural costs. The multi-point dispersed external prestressed prefabricated module reinforcement device for bridges of the present invention realizes the rapid repair of large-span bridges with downward deflection deformation, ensures the smooth flow of major traffic arteries, and not only provides a new idea for bridge management and maintenance for bridge management units, but also provides technical solutions and theoretical support for construction units, and also provides design references for design units to make possible changes in the entire life of the bridge during the design process.

[0037] In this embodiment, multiple dispersed external prestressing cables 4 are subjected to equal or similar amounts of prestress after tensioning. Since the design of long-span bridge structures can result in geometric differences in the internal structure due to multiple factors, especially the uncertainty of the stress state, an adaptable modular structure (anchors and steering components) needs to be optimized by analyzing the characteristics of different spans, cross-sectional structures, and other characteristics, and dividing them into different specifications. To this end, based on the research on the deformation adjustment mechanism of multi-point dispersed external prestressing, the anchors and steering components at each point are unified or classified, and the same dispersed external prestressing cables are arranged as much as possible, with the corresponding dispersed external prestressing cable force T, so that the corresponding anchor points are subjected to the same force. This has the benefit of the anchors being subjected to the same force, thereby further improving the versatility of the prefabricated anchor blocks and prefabricated steering blocks.

[0038] As a preferred embodiment, anchor bars are embedded in the prefabricated turning member 2. The anchor bars extend outside the prefabricated turning member 2 and into the wet joint a. A first anchor bar 11 is installed at the turning point. The anchor bar is connected to the first anchor bar 11. Concrete 5 covers the anchor bar and the first anchor bar 11.

[0039] See Figure 3 Figure 1 shows a schematic diagram of the installation of a prefabricated turning block in a T-beam according to an embodiment of the present invention. A wet joint is formed between the prefabricated turning block and the web and top plates of the T-shaped bridge to be reinforced. The anchor bars of the prefabricated turning block extend into the wet joint. The first end of a first embedded bar is implanted in the web and top plates of the T-shaped bridge to be reinforced and welded to the anchor bar of the prefabricated turning block. Concrete is poured into the wet joint to cover the anchor bar and the first embedded bar.

[0040] Furthermore, anchor bars 31 are embedded in the prefabricated anchor member 3. The anchor bars extend out of the prefabricated steering member 2 and into the wet joint a. A second anchor bar 12 is installed at the anchor point. The anchor bar is connected to the second anchor bar 12, and the concrete 5 is covered on the anchor bar and the second anchor bar 12.

[0041] See Figure 2 Figure 2 shows a schematic diagram of the installation of a precast anchor block in a box girder according to an embodiment of the present invention. A wet joint is formed between the precast anchor and the web and base plates of the box-shaped bridge to be reinforced. The anchor bar of the precast anchor extends into the wet joint. The first end of the second anchor bar is implanted in the web and base plates of the box-shaped bridge to be reinforced and welded to the anchor bar of the precast anchor. Concrete is poured into the wet joint to cover the anchor bar and the second anchor bar.

[0042] As a preferred embodiment, the first planted reinforcement is connected to the anchoring reinforcement of the prefabricated steering member through a threaded sleeve. The second planted reinforcement is connected to the anchoring reinforcement of the prefabricated anchoring member through a threaded sleeve.

[0043] In this embodiment, the prefabricated steering member and the prefabricated anchoring member are prefabricated reinforced concrete blocks.

[0044] In some embodiments, the first embedded bar is welded to the anchor bar of the prefabricated steering member, and the second embedded bar is welded to the anchor bar of the prefabricated anchor member.

[0045] In a preferred embodiment, concrete 5 is ultra-high performance concrete. By dispersing the stress points of the bridge to be reinforced, the corresponding prefabricated anchors (anchor blocks) and prefabricated deflectors (deflectors) are naturally smaller than traditional anchor blocks and deflectors. Leveraging the superior stress-bearing properties of ultra-high performance concrete (UHPC), the prefabricated anchors and deflectors for dispersing the external prestressed cables can be miniaturized, facilitating rapid construction and installation.

[0046] Furthermore, since the prefabricated anchors or prefabricated steering parts are classified and uniformly stressed in advance, the relevant prefabricated anchors or prefabricated steering parts can be prefabricated in the factory in advance. For steering gears with steering requirements, this not only saves processing time and money because the same steering gear is used, but also allows for pre-embedding in advance.

[0047] Standardized prefabricated anchors or prefabricated steering parts simplify the work of designers, reduce construction difficulty and cost, save steering device costs and processing time, and provide convenience for subsequent on-site installation, shorten construction period and improve construction quality.

[0048] The prefabricated anchor 3 is installed obliquely at the anchor point. The prefabricated anchors and prefabricated steering parts are installed according to the number and position requirements of the anchor points and steering points required for the force of the bridge to be reinforced. The anchor points and steering points are scattered at the bottom of the beam, the top of the beam, the web and other positions, and are also arranged separately in the longitudinal direction of the bridge to be reinforced. The oblique installation of anchors and steering parts is divided into three categories: prefabricated anchors with large-angle oblique arrangement of cables; prefabricated anchors with small-angle oblique or horizontal arrangement of cables; and prefabricated steering parts at specific angles. Each category of the above obliquely installed prefabricated anchors and prefabricated steering parts is a standard part with the same structural dimensions.

[0049] The present invention provides a reinforcement method for a bridge multi-point dispersed external prestressed prefabricated module reinforcement device, comprising the following steps:

[0050] S1: Determine a turning point of the bridge 1 to be reinforced and a plurality of anchoring points dispersedly arranged on opposite sides of the turning point.

[0051] S2: A prefabricated turning member 2 is arranged at the turning point of the bridge 1 to be reinforced, so that a wet joint a is formed between the prefabricated turning member 2 and the bridge 1 to be reinforced.

[0052] Specifically, a first anchor bar is implanted at the turning point of the bridge to be reinforced, and the anchor bar of the prefabricated steering component is connected to the first anchor bar, so that a wet joint is formed between the prefabricated steering component and the beam body of the bridge to be reinforced.

[0053] S3: multiple prefabricated anchors 3 are arranged at multiple anchoring points on opposite sides of the turning point, so that wet joints a are formed between the prefabricated anchors 3 and the bridge 1 to be reinforced.

[0054] Specifically, a second anchor bar is implanted at the anchor point of the bridge to be reinforced, and the anchor bar of the prefabricated anchor is connected to the second anchor bar, so that a wet joint is formed between the prefabricated anchor and the beam of the bridge to be reinforced.

[0055] S4: pouring concrete 5 into the wet joints a formed between the prefabricated anchoring piece 3 , the prefabricated deflecting piece 2 and the bridge 1 to be reinforced, so that the prefabricated anchoring piece 3 and the prefabricated deflecting piece 2 are fixed to the bridge 1 to be reinforced.

[0056] S5: After the concrete in the wet joint hardens, a plurality of dispersed external prestressed cables 4 are passed through the prefabricated deflection member 2, and both ends of the dispersed external prestressed cables 4 are connected to the prefabricated anchoring members 3 on opposite sides of the deflection point.

[0057] S6: After both ends of the dispersed external prestressed cables 4 are connected to the prefabricated anchors, the dispersed external prestressed cables 4 are tensioned to apply prestress to the dispersed external prestressed cables 4 .

[0058] When the dispersed external prestressing cables 4 are tensioned to apply prestress to the dispersed external prestressing cables 4 , equal or similar prestress is applied to the plurality of dispersed external prestressing cables 4 .

[0059] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0060] The present invention has been described in detail above with reference to the embodiments of the accompanying drawings. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined by the appended claims.

Claims

1. A multi-point dispersed external prestressed prefabricated module reinforcement device for bridges, characterized in that: include: A prefabricated steering member, wherein the prefabricated steering member is arranged at a steering point of the bridge to be reinforced, and a plurality of dispersed anchoring points are arranged on opposite sides of the steering point; a plurality of prefabricated anchors, wherein the prefabricated anchors are arranged at the anchor points; Wet joints are formed between the prefabricated anchoring piece, the prefabricated steering piece and the bridge to be reinforced, respectively, and concrete is poured in the wet joints; a plurality of dispersed external prestressed cables, wherein the dispersed external prestressed cables are passed through the prefabricated turning member, and both ends of the dispersed external prestressed cables are respectively connected to the prefabricated anchoring members on opposite sides of the turning point; Anchor bars are embedded in the prefabricated steering member, extending from the outside of the prefabricated steering member and into the wet joint. A first anchor bar is installed at the steering point, the anchor bar is connected to the first anchor bar, and the concrete covers the anchor bar and the first anchor bar. Anchor bars are embedded in the prefabricated anchoring member, the anchor bars extend out of the prefabricated steering member and into the wet joint, a second anchor bar is installed at the anchor point, the anchor bar is connected to the second anchor bar, and the concrete covers the anchor bar and the second anchor bar; The concrete is ultra-high performance concrete.

2. The multi-point dispersed external prestressed prefabricated module reinforcement device for bridges according to claim 1 is characterized in that: The plurality of dispersed external prestress cables are respectively applied with equal or similar prestress.

3. The multi-point dispersed external prestressed prefabricated module reinforcement device for bridges according to claim 1 is characterized in that: The prefabricated anchoring piece is installed obliquely at the anchoring point.

4. A reinforcement method for a bridge multi-point dispersed external prestressed prefabricated module reinforcement device according to any one of claims 1 to 3, characterized in that: The following steps are involved: determining a turning point of the bridge to be reinforced and a plurality of anchoring points dispersedly arranged on opposite sides of the turning point; Arranging a prefabricated turning member at a turning point of the bridge to be reinforced, so that a wet joint is formed between the prefabricated turning member and the bridge to be reinforced; Disposing a plurality of prefabricated anchors at a plurality of anchoring points on opposite sides of the turning point, so that wet joints are formed between the prefabricated anchors and the bridge to be reinforced; pouring concrete into the wet joints formed between the prefabricated anchoring piece, the prefabricated deflecting piece, and the bridge to be reinforced, respectively, so that the prefabricated anchoring piece and the prefabricated deflecting piece are fixed to the bridge to be reinforced; Passing a plurality of dispersed external prestressed cables through the prefabricated turning member, and connecting two ends of the dispersed external prestressed cables to the prefabricated anchoring members on opposite sides of the turning point; After both ends of the dispersed external prestressed cables are connected to the prefabricated anchors, the dispersed external prestressed cables are tensioned to apply prestress to the dispersed external prestressed cables.

5. The reinforcement method according to claim 4, characterized in that: When implementing the step of tensioning the dispersed external prestressed cables to apply prestress to the dispersed external prestressed cables, equal or similar prestress is applied to the plurality of dispersed external prestressed cables.

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