Fiber rigid lattice for reinforcing bridges and buildings and preparation method and application thereof

Abstract

The application discloses a fiber rigid lattice for reinforcing bridges and buildings and a preparation method and application thereof, and comprises at least two layers of radial rod layers and at least one layer of weft rod layer, and the weft rod layer and the radial rod layer are arranged alternately; the radial rod layer comprises a plurality of mutually parallel radial rods, the weft rod layer comprises a plurality of mutually parallel weft rods, and the radial rods and the weft rods are perpendicular to each other and cross each other; as a feature of the structure provided by the application, the radial rods and the weft rods are not woven; and the fiber rigid lattice for reinforcing bridges and buildings further comprises a resin matrix. The fiber rigid lattice provided by the application has the characteristics of high strength, high rigidity, corrosion resistance and the like, and can effectively improve the bearing capacity and durability of a bridge structure. Based on the method, the radial and weft fiber materials can be ensured to be in a linear form, and the strength loss caused by bending and angle folding is avoided.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering structure reinforcement and building reinforcement technology, specifically relating to fiber rigid grids for bridge and building reinforcement, their preparation methods and applications. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] As bridges and buildings age and traffic volume increases, many bridges have experienced varying degrees of damage, such as structural cracking, rusting and expansion of reinforcing steel, and decreased load-bearing capacity. Traditional bridge and building reinforcement methods, such as increasing cross-sections and bonding steel plates, have limitations, including high construction difficulty, poor durability, and the need for regular maintenance.

[0004] Traditional concrete bridge decks weigh up to 24 kN / m³, resulting in excessive loads on the bridge structure. Fiber-reinforced composite materials, due to their advantages such as lightweight, high strength, and corrosion resistance, are increasingly widely used in bridge and building reinforcement. Fiber-reinforced composite materials are used in bridge and building reinforcement in the following ways:

[0005] 1. For small- and medium-span bridges, fiber-reinforced polymer (FRP) bridge decks have radial struts (longitudinal to bridge direction) that bear 80% of the vertical load, and latitudinal struts (transverse to bridge direction) that resist lateral shear force. The overall density is only 1.8 kN / m³, resulting in a stiffness increase of over 30%. However, ordinary fiber-reinforced polymer (FRP) panels have insufficient stiffness and are prone to flutter.

[0006] 2. FRP reinforcement skeleton for bridge and building reinforcement: the orthogonal multilayer structure has a fatigue strength of 70%-80% of the tensile strength, and the resin matrix isolates the corrosive medium, making it suitable for humid bridge environments; however, the interface between steel bars and concrete is prone to corrosion in the reinforcement of old bridges, and the fatigue resistance of mixed fiber reinforcement is poor (strength loss of more than 40% per million cycles).

[0007] 3. The pedestrian bridge's FRP load-bearing beams feature three layers of radial bars to enhance bending stiffness and two layers of lateral bars to improve torsional resistance, achieving a torsional stiffness of 8000-12000N. m², maintenance cycle extended to 20 years; however, metal beams are prone to corrosion and require frequent maintenance, and single-layer fiber beams have insufficient torsional resistance (torsional stiffness <5000N). m²).

[0008] The above-mentioned defects limit the use of fiber-reinforced composite materials in bridge and building reinforcement.

[0009] The published patent CN105951555 provides a reinforced fiberglass geogrid for roadbeds. Like other geogrids, the fiberglass geogrid is made of warp and weft yarns. In this structure, both the warp and weft yarns are bent and the matrix resin does not protect the fibers enough. The high-modulus yarns such as glass fiber and carbon fiber commonly used in FRP composites are brittle. Bending and twisting will significantly reduce their strength, which will cause the radial and weft strength loss of the bridge fiber reinforced composite (FRP) bridge deck.

[0010] In addition, existing grid production lines are all suitable for warp-knitted grids, but there is no suitable production equipment for grids with layered laying structures. Summary of the Invention

[0011] In view of the shortcomings of the existing technology, the purpose of this invention is to provide fiber rigid grids for bridge and building reinforcement, their preparation methods and applications.

[0012] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides a fiber rigid grid for reinforcing bridges and buildings, comprising at least two radial bar layers and at least one weft bar layer, wherein the weft bar layers and radial bar layers are arranged alternately; the radial bar layer comprises a plurality of parallel radial bars, the weft bar layer comprises a plurality of parallel weft bars, and the radial bars and weft bars are laid perpendicular to each other; the structural feature provided by the present invention is that the radial bars and weft bars are not woven together. The fiber rigid grid for bridge and building reinforcement also includes a resin matrix.

[0013] The radial and latitudinal bars are made of fiber material, and the radial and latitudinal bar layers are bonded together with a resin matrix.

[0014] In some embodiments of the present invention, the radial and lateral bars are fiber strips made of carbon fiber, glass fiber or basalt fiber.

[0015] In some embodiments of the present invention, it includes three radial rod layers and two latitudinal rod layers, with the radial rods and latitudinal rods forming a 3+2 structure, that is, the two latitudinal rod layers are spaced between the three radial rod layers.

[0016] The fiber rigid grid structure for bridge and building reinforcement provided by this invention adopts a unique multi-layer superimposed structure. Compared with the single-layer structure, this multi-layer superimposed structure greatly enhances the load-bearing capacity and mechanical properties of the grid in different directions.

[0017] The fiber rigid grid structure for bridge and building reinforcement provided by this invention does not involve weaving between the radial and latitudinal bars. Since the weaving process inevitably causes bending of the radial and latitudinal bars, resulting in a loss of radial and latitudinal strength, the structure provided by this invention ensures the straight shape of the radial and lateral bars, which helps to maintain the mechanical strength along the limiting bars.

[0018] In the fiber rigid grid structure for bridge and building reinforcement provided by this invention, the warp and weft bars are interwoven perpendicularly. This precise orthogonal layout ensures that the load is evenly transferred and distributed within the grid plane, avoiding localized stress concentration. Whether the bridge is subjected to dynamic loads from vehicle traffic or static loads from its own structure, this grid can rationally distribute the load through this layout, ensuring the stability of the bridge structure.

[0019] In a second aspect, the present invention provides a method for preparing the fiber rigid grid for bridge and building reinforcement as described in the first aspect, comprising the following steps: Step 1, Preparation stage: Based on the grid specifications, design the number of resin matrix and fiber strips serving as longitudinal and lattice bars in the grid, as well as the number of lay-up layers. Step 2, the longitudinal rod movement and advancement stage: the longitudinal rod moves towards the warp and weft interlacing laying mechanism under the drive of the traction mechanism, the warp and weft interlacing laying mechanism includes guide rollers for limiting the longitudinal rod; Step 3, the cross-laying stage: In the cross-laying mechanism, the layup of radial bars containing several layers of fiber strips from top to bottom and latitudinal bars containing several layers of fiber strips from top to bottom is achieved; Step 4, Impregnation stage: The radial and latitudinal rods that have completed the layup move to the impregnation tank of the impregnation mechanism, where the resin impregnates the radial and latitudinal rods, and then they move to the next station; Step 5, Heating and Curing Stage: At the heating and curing mechanism, the resin is solidified using a heater to prepare a cured grid; then demolding is performed to obtain the grid product. Step 6: The horizontal bars on both sides are cut by the cutting mechanism, or the radial bars of the corresponding length are cut as needed, and then output by the output mechanism.

[0020] In some embodiments of the present invention, the cross-laying mechanism includes a laying frame and a guide roller disposed on the laying frame; the guide roller includes a guide roller body, a plurality of radial guide grooves arranged in parallel along the circumference of the guide roller body, and at least one latitudinal guide groove along the length of the guide roller body, the radial guide grooves being used to accommodate radial rods, and the latitudinal guide grooves being used to accommodate latitudinal rods.

[0021] Furthermore, the radial guide groove is a rectangular groove with a 1° draft angle at both ends for easy demolding; as a feasible improvement, the radial guide groove is a trapezoidal groove that expands from the inside out. The lateral guide groove is a rectangular groove (with the same dimensions as the radial groove) perpendicular to the radial guide groove, and an "arc transition groove" (1mm radius) is provided at the intersection with the radial guide groove to avoid stress concentration at the interlayer intersection.

[0022] In some embodiments of the present invention, the spacing of the latitudinal guide grooves is customized according to product requirements, and the spacing of the radial guide grooves is 50mm-200mm.

[0023] In a preferred embodiment, the radial and latitudinal rods form a 3+2 structure, meaning two layers of latitudinal rods are spaced apart between three layers of radial rods. The depth of the radial guide groove is greater than the depth of the latitudinal guide groove to accommodate the radial rods located on the outer layer.

[0024] In some embodiments of the present invention, the guide rollers are two guide rollers of the same structure that cooperate to accommodate superimposed radial and weft fiber strips.

[0025] In some embodiments of the present invention, a pressure roller linked with the guide roller is also included. The pressure roller consists of two rubber rollers that cooperate with each other to apply pressure and limit the radial and weft rods in preparation for the next impregnation step.

[0026] In some embodiments of the present invention, a weft bar feeding mechanism is provided on the side of the warp and weft interlacing mechanism to provide weft fiber strips to the warp and weft interlacing mechanism.

[0027] When there are multiple weft rods, the weft rod feeding mechanism can provide weft fiber strips of different heights.

[0028] In some embodiments of the present invention, a fiber strip unwinding mechanism and a fiber strip guide rail are provided in front of the cross-laying mechanism, and an impregnation mechanism, a heating and curing mechanism, a traction mechanism, a cutting mechanism and an output mechanism are provided behind the cross-laying mechanism.

[0029] The fiber sliver unwinding mechanism includes an unwinding frame with a rotatable unwinding shaft mounted on it. The fiber sliver roll is placed on the unwinding shaft of the unwinding frame and supplied towards the cross-laying mechanism under external driving force. A tension adjusting device, such as a spring or counterweight, is added to one side of the unwinding shaft to adjust the unwinding tension of the fiber sliver.

[0030] The fiber strip rolls are arranged horizontally and vertically on the unwinding rack, providing three layers of fiber strips, each layer containing several columns of longitudinal fiber strips.

[0031] The fiber strip guide rail is provided with through holes for the fiber strip to pass through, thereby guiding and limiting the fiber strip.

[0032] In step 3, the fiber strip guide rails create a large gap between the upper and lower radial rods and the middle radial rods, respectively. Two layers of weft rods are provided in front of the guide roller using the weft rod feeding mechanism 9, located above and below the middle radial rods, respectively. These weft rods are then clamped at both ends by clamping devices with rubber pads, which are driven by a drive mechanism to move towards the guide roller. When the weft rods move to the weft guide groove, they are embedded in the groove and then move towards the pressure roller at the same speed as the radial rods.

[0033] Thirdly, the present invention provides the application of the fiber rigid grid for bridge and building reinforcement described in the first aspect in bridge laying.

[0034] Fourthly, the present invention provides a construction method for bridge reinforcement, wherein the fiber rigid grid for bridge and building reinforcement prepared in the second aspect is laid on the erected bridge surface, the fiber rigid grid for bridge and building reinforcement is pressurized by a tensioning component, and then a cement layer is applied to the upper surface for curing, or it is anchored by anchors, and then a cement-based reinforcement material is poured or sprayed for curing, thereby completing the bridge reinforcement construction.

[0035] The fiber rigid grid for bridge and building reinforcement provided by the present invention, based on its structural characteristics, can replace the existing laying layer for the reinforcement of bridge decks, reinforcing skeletons and load-bearing beams of bridges, as well as for the flexural reinforcement, shear reinforcement, axial compression reinforcement and seismic reinforcement of bridge beams, slabs, columns, ditches, pipelines, tunnels, retaining walls and masonry.

[0036] The geogrid provided by this invention undergoes resin matrix treatment to improve its adhesion to the bridge structure. The resin acts as an "intermediary," firmly adhering to the surface of the geogrid fibers while simultaneously forming a strong chemical and mechanical bond with bridge materials such as concrete or steel, ensuring effective load transfer. At the same time, the resin provides a protective barrier for the internal reinforcing materials such as carbon fiber, glass fiber, and basalt fiber, preventing them from being worn or corroded during construction and use, thus ensuring long-term durability. Furthermore, the treated geogrid can be better positioned in the bridge deck pavement or reinforcement layer, is less prone to slippage or warping, and ensures construction quality.

[0037] The advantages of this invention lie in its innovative production process, which maximizes the optimal tensile strength and tensile modulus of the fiber composite material on prefabricated composite matrix strips, while ensuring sufficient matrix resin fusion and coating to provide adequate protection for the fibers. Secondly, the construction process is simple, fully utilizing the lightweight and high-strength characteristics of the composite material. No large equipment is required on-site; basic tools and a small amount of manpower are sufficient for construction, and subsequent maintenance is unnecessary.

[0038] The beneficial effects achieved by one or more embodiments of the present invention described above are as follows: 1. The fiber rigid grid provided by this invention possesses high strength, high stiffness, and corrosion resistance, effectively improving the load-bearing capacity and durability of bridge structures. Based on this method, the radial and latitudinal fiber materials can maintain a straight shape, avoiding strength loss caused by bending and angles. Furthermore, based on the different strength requirements in the radial and latitudinal directions, radial and latitudinal fiber strip materials with different properties can be selected.

[0039] 2. In some embodiments of the present invention, the fiber rigid grid for bridge and building reinforcement comprises three radial bar layers and two transverse bar layers. The three-layer radial structure can effectively cope with the longitudinal tensile and compressive stresses of the bridge, while the two-layer transverse structure can better resist transverse loads, enabling the grid to play a comprehensive reinforcement role in bridge and building reinforcement.

[0040] 3. The fiber rigid grid for bridge and building reinforcement provided by this invention is prepared by a resin matrix thermosetting molding process. The resin matrix is ​​impregnated with radial and latitudinal bars, and then cured by heating, resulting in a tight bond between the resin and fibers into a single unit. This thermosetting molding process endows the grid with excellent integrity and stability. The three-dimensional mesh structure formed after resin curing not only enhances the adhesion between fibers but also effectively transfers stress, improving the grid's strength and durability. Attached Figure Description

[0041] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0042] Figure 1 A side view of a fiber rigid grid production line provided by the present invention; Figure 2 A top view of the fiber rigid grid production line provided by the present invention; Figure 3 The structural diagram of the fiber strip guide rail in the fiber rigid grid production line provided by the present invention; Figure 4 The diagram shows the structure of the cross-laying mechanism in the fiber rigid grid production line provided by the present invention.

[0043] Figure 5 A partial structural diagram of the cross-laying mechanism in the fiber rigid grid production line provided by the present invention.

[0044] Among them, 1-fiber strip unwinding mechanism, 2-fiber strip guide rail, 3-warp and weft cross-laying mechanism, 4-impregnation mechanism, 5-heat curing mechanism, 6-traction mechanism, 7-cutting mechanism, 8-output mechanism, 9-weft rod feeding mechanism; 101-Fiber Strip Roll; 301 - Guide roller, 302 - Pressure roller; 3011 - Guide roller body, 3012 - Radial guide groove, 3013 - Weft guide groove. Detailed Implementation

[0045] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0046] The present invention will be further described below with reference to the embodiments.

[0047] Example 1: Fiber Rigid Grating Production Line like Figure 1 As shown, it includes a fiber strip unwinding mechanism 1, a fiber strip guide rail 2, a cross-laying mechanism for radial and weft rods 3, an impregnation mechanism 4, a heat curing mechanism 5, a traction mechanism 6, a cutting mechanism 7, and an output mechanism 8 arranged in sequence.

[0048] The fiber strip unwinding mechanism 1, fiber strip guide rail 2, radial and weft rods cross-laying mechanism 3, impregnation mechanism 4, heating and curing mechanism 5, traction mechanism 6, cutting mechanism 7, and output mechanism 8 can be fixed separately on the ground or fixed on the same frame to ensure the relative position of each mechanism is fixed.

[0049] The fiber sliver unwinding mechanism 1 includes an unwinding frame with a rotatable unwinding shaft mounted on it. The fiber sliver roll 101 is placed on the unwinding shaft of the unwinding frame and is supplied to the cross-laying mechanism 3 under the action of an external driving force. A tension adjusting device, such as a spring or a counterweight, is added to one side of the unwinding shaft to adjust the unwinding tension of the fiber sliver.

[0050] The fiber strip roll 101 is arranged horizontally and vertically on the unwinding rack, providing three layers of fiber strips, each layer containing several columns of longitudinal fiber strips.

[0051] The fiber strip guide rail 2 is provided with through holes for the fiber strip to pass through, such as Figure 1 and Figure 3 As shown, the fiber strip is guided and limited.

[0052] The structure of the latitude and longitude interlacing laying mechanism 3 is as follows: Figure 1 As shown, it includes a laying frame, a guide roller 301 mounted on the laying frame, and a pressure roller 302 linked to the guide roller 301. The structure of the guide roller 301 is as follows: Figure 4As shown, the device includes a guide roller body 3011, with several parallel radial guide grooves 3012 arranged along its circumference, and at least one longitudinal guide groove 3013 along its length. The radial guide grooves 3012 are used to accommodate radial rods, and the longitudinal guide grooves 3013 are used to accommodate longitudinal rods. The radial guide grooves 3012 are rectangular grooves with a 1° draft angle at both ends for easy demolding. As a possible improvement, the radial guide grooves 3012 can be trapezoidal grooves that expand from the inside out. The longitudinal guide grooves 3013 are rectangular grooves perpendicular to the radial guide grooves 3012 (with the same dimensions as the radial grooves), and an "arc-shaped transition groove" (1mm radius) is provided at the intersection with the radial guide grooves 3012 to avoid stress concentration at the interlayer intersection.

[0053] The spacing of the latitudinal guide grooves 3013 is customized according to product requirements, and the spacing of the radial guide grooves 3012 is 50mm-200mm.

[0054] In a preferred embodiment, the radial and latitudinal rods form a 3+2 structure, meaning the latitudinal rods are spaced between the radial rods. For example... Figure 5 As shown, the depth of the radial guide groove 3012 is greater than the depth of the lateral guide groove 3013 to accommodate the radial rod located on the outer layer.

[0055] The guide roller 301 consists of two identical guide rollers that work together to accommodate superimposed radial and weft fiber strips.

[0056] The pressure rollers 302 are two rubber rollers that cooperate with each other to apply pressure and limit the radial and weft rods, preparing for the next step of impregnation.

[0057] like Figure 2 As shown, a weft bar feeding mechanism 9 is provided on the side of the warp and weft interlacing mechanism 3 to provide weft fiber strips to the warp and weft interlacing mechanism 3.

[0058] When there are multiple weft rods, the weft rod feeding mechanism 9 can provide weft fiber strips of different heights.

[0059] The impregnation mechanism 4 includes an impregnation tank for containing the resin matrix and heating it to a suitable temperature.

[0060] The output mechanism 8 includes output rollers arranged in parallel, and can also be connected to a winding mechanism to wind up the grid.

[0061] The working process of this device is as follows: Preparation stage: Based on the grid specifications, design the resin matrix and the number of fiber strips and layups that serve as longitudinal and latitudinal bars in the grid.

[0062] The longitudinal bar movement and advancement stage: Driven by the traction mechanism 6, the longitudinal bar moves from the fiber strip unwinding mechanism 1 to the fiber strip guide rail 2. The longitudinal bar is limited in the radial guide groove 3012 of the guide roller 3. The moving speed is coordinated with the guide roller of the warp and weft cross-laying mechanism 3 to achieve the required weft bar spacing.

[0063] Laying stage at the intersection of latitude and longitude: such as Figure 4 As shown, the radial bar comprises three layers of fiber strips from top to bottom, and the weft bar comprises two layers of fiber strips from top to bottom. The fiber strip guide rail 2 ensures a large gap between the upper and lower radial bars and the middle radial bar, respectively. In front of the guide roller 301, two layers of weft bars are provided by the weft bar feeding mechanism 9, located above and below the middle radial bar, respectively. Then, clamps with rubber pads are used to hold the two ends of the two layers of weft bars. The clamps are driven by the drive mechanism to move towards the guide roller 301. When the weft bar moves to the weft guide groove 3013, it is embedded in the weft guide groove 3013, and then moves towards the pressure roller at the same speed as the radial bar.

[0064] Impregnation stage: The radial and latitudinal rods, after the layup is completed, move to the impregnation tank of the impregnation mechanism 4, where the resin immerses the radial and latitudinal rods, and then they move to the next station.

[0065] Heating and curing stage: At the heating and curing mechanism 5, the resin is solidified using a heater to prepare a cured grid. Then, the grid is demolded to obtain the grid product, which is then cut by the cutting mechanism 7 to cut the transverse bars on both sides or the radial bars of the appropriate length as needed, and then output by the output mechanism 8.

[0066] Example 2 Fiber rigid grid for bridge and building reinforcement The FRP fiber strip used in this embodiment is a carbon fiber strip, which is prepared by pultrusion process using carbon fiber bundles (monofilament diameter 5μm). The cross-section is 7mm long and 1mm wide. The radial tensile strength of the carbon fiber strip is not less than 1800 MPa, the weft tensile strength of the carbon fiber strip is not less than 900 MPa, the radial tensile elongation at break of the carbon fiber strip is not less than 140 MPa, and the weft tensile elongation at break of the carbon fiber strip is not less than 45 MPa; the elastic modulus is not less than 1.0 GPa in the radial direction and not less than 1.6 GPa in the weft direction.

[0067] The grid structure was prepared using the above materials through the production line and preparation process provided in Example 1.

[0068] Example 3 A construction method for bridge reinforcement The fiber rigid grid for bridge and building reinforcement prepared in Example 2 is laid on the erected bridge surface. The fiber rigid grid for bridge reinforcement is pressurized by tensioning components, and then a cement layer is applied to the upper surface for curing, or it is anchored by anchors. Then, the reinforcement layer cement-based material is poured or sprayed and cured to complete the bridge reinforcement construction.

[0069] The bridge structure prepared based on the above method is designed to withstand an overload of 70T and has a service life of 60 years.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fiber rigid grid for reinforcing bridges and buildings, characterized in that, It includes at least two radial bar layers and at least one latitudinal bar layer, with the latitudinal and radial bar layers arranged alternately; the radial bar layer contains several parallel radial bars, and the latitudinal bar layer contains several parallel latitudinal bars, with the radial and latitudinal bars laid perpendicular to each other. The characteristic of the structure provided by the present invention is that the radial and latitudinal bars are not woven together. The fiber rigid grid for bridge and building reinforcement also includes a resin matrix.

2. The fiber rigid grid for bridge and building reinforcement according to claim 1, characterized in that, The radial and latitudinal bars are made of fiber material, and the radial and latitudinal bar layers are bonded together with a resin matrix.

3. The fiber rigid grid for bridge and building reinforcement according to claim 1, characterized in that, The radial and lateral bars are fiber strips made of carbon fiber, glass fiber, or basalt fiber.

4. A method for preparing a fiber rigid grid for bridge and building reinforcement, characterized in that, Includes the following steps: Step 1, Preparation stage: Based on the grid specifications, design the number of resin matrix and fiber strips serving as longitudinal and lattice bars in the grid, as well as the number of lay-up layers. Step 2, the longitudinal rod movement and advancement stage: the longitudinal rod moves towards the warp and weft interlacing laying mechanism under the drive of the traction mechanism, the warp and weft interlacing laying mechanism includes guide rollers for limiting the longitudinal rod; Step 3, Laying out the warp and weft: In the laying out mechanism, the radial and latitudinal rods are laid out; Step 4, Impregnation stage: The radial and latitudinal rods that have completed the layup move to the impregnation tank of the impregnation mechanism, where the resin impregnates the radial and latitudinal rods, and then they move to the next station; Step 5, Heating and Curing Stage: At the heating and curing mechanism, the resin is solidified using a heater to prepare a cured grid; then demolding is performed to obtain the grid product. Step 6: The horizontal bars on both sides are cut by the cutting mechanism, or the radial bars of the corresponding length are cut as needed, and then the output is output by the output mechanism.

5. The method for preparing fiber rigid grid for bridge and building reinforcement according to claim 4, characterized in that, The cross-latitude and longitude laying mechanism includes a laying frame and guide rollers arranged on the laying frame; the guide roller includes a guide roller body, a plurality of radial guide grooves arranged in parallel along the circumference of the guide roller body, and at least one latitudinal guide groove along the length of the guide roller body, the radial guide grooves are used to accommodate radial rods, and the latitudinal guide grooves are used to accommodate latitudinal rods.

6. The method for preparing fiber rigid grid for bridge and building reinforcement according to claim 4, characterized in that, The radial guide groove is a rectangular groove with a 1° draft angle at both ends to facilitate demolding; as a feasible improvement, the radial guide groove is a trapezoidal groove that expands from the inside to the outside.

7. The method for preparing fiber rigid grid for bridge and building reinforcement according to claim 4, characterized in that, It also includes a pressure roller that is linked to the guide roller. The pressure roller consists of two rubber rollers that cooperate with each other to apply pressure and limit the radial and weft rods in preparation for the next impregnation step.

8. The method for preparing fiber rigid grid for bridge and building reinforcement according to claim 4, characterized in that, A weft bar feeding mechanism is installed on the side of the warp and weft interlacing laying mechanism to provide weft fiber strips to the warp and weft interlacing laying mechanism.

9. The application of the fiber rigid grid for bridge and building reinforcement as described in any one of claims 1 to 3 in bridge paving.

10. A construction method for bridge reinforcement, characterized in that, The fiber rigid grid for bridge and building reinforcement as described in any one of claims 1 to 3 is laid on the erected bridge surface. The fiber rigid grid for bridge and building reinforcement is pressurized by a tensioning component, and then a cement layer is applied to the upper surface for curing, or it is anchored by anchors. Then, the reinforcement layer cement-based material is poured or sprayed, and the bridge and building reinforcement construction is completed.

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