Multi-scale fiber reinforced cement novel surface layer reinforcing technology and construction method thereof

Abstract

The invention relates to a multi-scale fiber reinforced cement novel surface layer reinforcing technology and a construction method thereof, and belongs to the technical field of building structure reinforcing and repairing. An interface bonding system, a core reinforcing system and a functional protection system which are sequentially arranged in a stacked mode from inside to outside are included; a matched form adaptation structure and an auxiliary fixing structure form an integrated reinforcing structure, the interface combination system is of a gradient connection structure, the core reinforcing system is of a multi-scale fiber embedded structure, a radial stress dispersion structure is arranged in the core reinforcing system, and the function protection system is of an anti-corrosion and flame-retardant composite structure; construction follows the logic of pretreatment-connection-adaptation-reinforcement-forming-protection, and the construction method has the advantages of being high in strength, large in deformation, high in crack control capacity, environmentally friendly, low in carbon, high in durability and suitable for reinforcement of various walls.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of building structure reinforcement and repair, in particular to a multi-scale fiber-reinforced cement new surface layer reinforcement technology and a construction method thereof. BACKGROUND

[0002] With the infrastructure construction of China entering the high-quality development stage, the safety, durability and life cycle economy of engineering structures are increasingly stringent, and major projects such as cross-sea bridges, super high-rise buildings and deep tunnels are facing multiple challenges such as complex stress, severe environmental corrosion, earthquakes and impact loads. Under this background, the performance requirements of civil engineering industry for structure reinforcement materials are continuously improved, and the research and development of high-performance cement-based composite materials has become a key direction of industry development. The application of high-performance cement-based composite materials helps to improve the safety and durability of engineering structures, reduce maintenance costs and promote the sustainable development of infrastructure construction.

[0003] Before the present technical solution, there are two conventional means in the civil engineering industry for structure reinforcement: one is high ductility cement-based composite material based on micro-mechanical theory design, also known as ECC, which utilizes its excellent deformation capacity and crack width control capacity to enhance the stability of the structure to a certain extent; the other is ultra-high performance concrete based on the principle of closest packing, also known as UHPC, which is widely used in engineering structure reinforcement with high strength and durability requirements due to its high compressive strength and durability.

[0004] However, these conventional means in the prior art have obvious defects: high ductility cement-based composite material has limitations in compressive strength, ultimate bearing capacity and material cost; although ultra-high performance concrete has high compressive strength and durability, its deformation performance is weak.

[0005] The current civil engineering industry needs a cement-based composite material that combines the advantages of the above new materials and has high strength, large deformation, strong crack control capacity, green low carbon and high durability characteristics. SUMMARY

[0006] In order to solve the above problems, the application provides a multi-scale fiber-reinforced cement new surface layer reinforcement technology and a construction method thereof.

[0007] In a first aspect, the application provides a multi-scale fiber-reinforced cement new surface layer reinforcement technology, which adopts the following technical solution: The multi-scale fiber reinforced cement new surface layer reinforcement technology comprises a base wall and an integrated reinforcement structure, the integrated reinforcement structure comprises, in sequence, an interface bonding system, a core reinforcement system and a functional protection system, the interface bonding system is in direct contact with the surface of the base wall, the core reinforcement system is embedded between the interface bonding system and the functional protection system, and the functional protection system covers one side of the core reinforcement system away from the interface bonding system; the integrated reinforcement structure further comprises a shape adaptation structure and an auxiliary fixing structure, the shape adaptation structure is clamped between the interface bonding system and the core reinforcement system, and the auxiliary fixing structure penetrates through the shape adaptation structure and is detachably connected with the base wall.

[0008] By adopting the technical scheme, the multi-scale fiber reinforced cement new surface layer reinforcement technology is designed in a closed integrated manner through the layering of the interface bonding-core reinforcement-functional protection, and the shape adaptation structure and the auxiliary fixing structure are cooperatively limited, so that the systems are closely connected and the stress transmission path is continuous, the core reinforcement system is embedded in the middle, the strength and the bearing capacity of the reinforcement structure are effectively improved, the shape adaptation structure can adapt to different shapes of the base wall, the auxiliary fixing structure penetrates through the shape adaptation structure and is detachably connected with the base wall, and the installation and the later maintenance are facilitated.

[0009] Optionally, the interface bonding system comprises a penetration anchoring layer and a bonding transition layer, the penetration anchoring layer is arranged close to the base wall and is provided with a plurality of penetration protrusions on the surface, the penetration protrusions are embedded in the surface layer of the base wall, and the bonding transition layer is fixed on the side of the penetration anchoring layer away from the base wall and is directly attached to the core reinforcement system.

[0010] By adopting the technical scheme, the penetration protrusions of the penetration anchoring layer are embedded in the surface layer of the base wall, the connection strength and the anchoring force of the interface bonding system and the base wall are enhanced, the bonding transition layer covers the penetration anchoring layer and is directly attached to the core reinforcement system, the bonding transition layer plays a transition connection role, the interface bonding system and the core reinforcement system can work better in cooperation, and the reinforcement effect of the multi-scale fiber reinforced cement new surface layer reinforcement technology on the base wall is improved.

[0011] Optionally, the core reinforcement system comprises a continuous FRP grid, chopped fibers and a cement-based composite material matrix, the continuous FRP grid is arranged in layers, the chopped fibers are dispersedly filled in the pores of the continuous FRP grid, and the cement-based composite material matrix covers the continuous FRP grid and the chopped fibers to form an integral structure.

[0012] By adopting the technical scheme, the continuous FRP grid as macro-continuous fibers can significantly improve the bearing capacity, the chopped fibers can transmit stress at both ends of the micro-crack when the micro-crack appears, induce the matrix to generate a large number of dispersed micro-cracks, and endow the material with tensile strain hardening capacity and super-high ductility, the cement-based composite material matrix coats the continuous FRP grid and the chopped fibers to form an overall structure, so that the multi-scale fibers synergize to realize the advantages of high strength, high deformation and micro-crack, and the bending strength of the reinforced wall body is improved and the deformation performance is improved.

[0013] Optionally, the core reinforcing system further comprises an interface compatibility layer, the interface compatibility layer uniformly coats the outer surface of the chopped fibers, and fills the contact gap between the continuous FRP grid and the cement-based composite material matrix.

[0014] By adopting the technical scheme, the interface compatibility layer uniformly coats the outer surface of the chopped fibers, which can improve the combination tightness of the chopped fibers and the cement-based composite material matrix, fills the contact gap between the continuous FRP grid and the cement-based composite material matrix, and can enhance the synergistic stress capacity of the continuous FRP grid and the cement-based composite material matrix, thereby improving the overall performance of the core reinforcing system, so that the integrated reinforcing structure can better play the advantages of high strength, high deformation and micro-crack when reinforcing the base wall body.

[0015] Optionally, the continuous FRP grid adopts a segmented structure, which includes a plurality of grid units, the edges of adjacent grid units overlap to form an overlapping reinforcing area, and a buckle type splicing piece is fixedly arranged on the overlapping reinforcing area.

[0016] By adopting the technical scheme, the continuous FRP grid adopts a segmented structure, which is convenient for construction and transportation, the edges of adjacent grid units overlap to form an overlapping reinforcing area and are fixedly connected through the buckle type splicing piece, which can enhance the stability and continuity of the overall structure.

[0017] Optionally, the form adaptation structure includes a plurality of splicing units, each splicing unit includes a planar adaptation segment and a curved surface adaptation segment, and the planar adaptation segment and the curved surface adaptation segment are hinged through a flexible connecting piece.

[0018] By adopting the technical scheme, the form adaptation structure can adapt to different base wall body forms, is convenient for assembly and disassembly, and is helpful for accurate laying of the core reinforcing system.

[0019] Optionally, the functional protection system includes a corrosion-resistant layer and a flame-retardant layer, the corrosion-resistant layer directly covers the surface of the core reinforcing system, the flame-retardant layer covers the side of the corrosion-resistant layer away from the core reinforcing system, and the edges of the corrosion-resistant layer and the flame-retardant layer are flush and tightly attached.

[0020] By adopting the technical scheme, the anticorrosive layer is directly covered on the surface of the core reinforcing system to prevent the core reinforcing system from being corroded, the fire-retardant layer is covered on the outside of the anticorrosive layer to endow the reinforced structure with fire-retardant performance, the edges of the two layers are flush and closely attached to each other, the reinforced structure can be effectively protected, and the durability and safety of the reinforced structure are improved.

[0021] Optionally, the core reinforcing system is provided with a stress dispersion structure, which is a rib structure and is fixedly connected to the inner side wall of the core reinforcing system at one end and extends to the inside of the interface bonding system at the other end.

[0022] By adopting the technical scheme, the stress dispersion structure of the rib structure can disperse the stress borne by the core reinforcing system to the interface bonding system, the stress dispersion capacity of the integrated reinforced structure as a whole can be enhanced, and the stability and bearing capacity of the reinforced structure are improved.

[0023] Optionally, the auxiliary fixing structure comprises a positioning rod and a limiting piece, one end of the positioning rod is inserted into the base layer wall, the other end is threadedly connected to the limiting piece, and the limiting piece is pressed against the surface of the shape-adapting structure.

[0024] By adopting the technical scheme, the positioning rod is inserted into the base layer wall to enable the shape-adapting structure to be stably attached to the base layer wall; the limiting piece is threadedly connected to the positioning rod and is pressed against the surface of the shape-adapting structure to further fix the shape-adapting structure, thereby ensuring the stability of the connection between the integrated reinforced structure and the base layer wall and enhancing the reinforcing effect.

[0025] In a second aspect, the application provides a construction method of the multi-scale fiber reinforced cement new surface layer reinforcing technology, which adopts the following technical scheme: The multi-scale fiber reinforced cement new surface layer reinforcing technology and the construction method thereof comprise the following steps: S1, base layer pretreatment, cleaning the surface of the base layer wall, removing impurities and repairing defects, and marking the installation positions of the auxiliary fixing structure on the surface of the base layer wall; S2, interface bonding construction, constructing a permeable anchoring layer on the surface of the base layer wall, and constructing a bonding transition layer on the surface of the permeable anchoring layer after the permeable anchoring layer is solidified to form an interface bonding system; S3, shape-adapting assembly, splicing the splicing units of the shape-adapting structure according to the shape of the base layer wall, attaching the shape-adapting structure to the surface of the bonding transition layer, and fixing the shape-adapting structure to the base layer wall through the auxiliary fixing structure; S4, reinforcing system laying, splicing and fixing each grid unit of the continuous FRP grid, embedding the grid unit into the shape-adapting structure, and forming a macroscopic reinforcing framework; S5, first base body forming, spraying a cement-based composite material on the surface of the continuous FRP grid to fill the grid pores and form an initial base body layer, and compacting through a rolling device; S6, Micro-reinforcement construction, lay chopped fibers on the surface of the initial base layer which has not yet initial set to ensure the uniform dispersion of chopped fibers; S7, Second base forming, continue to spray cement-based composite material to cover the chopped fibers and reach the designed thickness, form the core reinforcement system, and then perform surface leveling; S8, Curing, moisturize and cure the core reinforcement system until complete curing; S9, Functional protection construction, sequentially construct the corrosion-resistant layer and the fire-resistant layer on the surface of the core reinforcement system to form the functional protection system, and complete the integrated reinforcement structure construction.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The integrated reinforcement structure adopts a layered and closed design of "interface combination-core reinforcement-functional protection", cooperates with the shape adaptive structure and the auxiliary fixing structure for collaborative limiting, the systems are closely connected and the stress is smoothly transmitted, which can effectively avoid the delamination and peeling problems of traditional reinforcement structures; 2. The core reinforcement system forms a multi-scale embedded structure through the macroscopic framework of the continuous FRP grid and the microscopic filling of the chopped fibers, cooperates with the radial layout of the stress dispersion structure to realize the uniform transmission and dispersion of the load, and greatly improves the bearing capacity and crack resistance of the reinforcement structure; 3. The modularized splicing design of the shape adaptive structure can flexibly adapt to different shaped walls, and the detachable design of the auxiliary fixing structure facilitates construction adjustment, the overall construction does not need a large number of destructive drilling, and the original wall is less damaged, and the construction efficiency is high; 4. The composite layered structure of the functional protection system and the setting of the interface compatible layer can effectively isolate the external environmental erosion, cooperate with the corrosion-resistant properties of the FRP material itself, prolong the service life of the reinforcement structure, and improve the stability of long-term use. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is Figure 1 a partial enlarged schematic diagram of part A in

[0028] BRIEF DESCRIPTION OF DRAWINGS 1, base wall; 2, interface combination system; 3, core reinforcement system; 31, continuous FRP grid; 311, overlapping reinforcement area; 312, buckle type splicing piece; 32, chopped fiber; 33, cement-based composite material base; 34, interface compatible layer; 35, stress dispersion structure; 4, functional protection system; 41, corrosion-resistant layer; 42, fire-resistant layer; 5, shape adaptive structure; 51, splicing unit; 52, flexible connecting piece; 6, auxiliary fixing structure; 61, limiting piece; 62, positioning rod. DETAILED DESCRIPTION

[0029] The application will be further described below in conjunction with the accompanying drawings. Figures 1-2 The application will be further described below in conjunction with the accompanying drawings.

[0030] The application discloses a new type of multi-scale fiber reinforced cement surface layer reinforcement technology.

[0031] Reference Figure 1 The application discloses a new type of multi-scale fiber reinforced cement surface layer reinforcement technology, which comprises a base wall 1, the base wall 1 comprises a straight section and a curved section, and an integrated reinforcement structure is arranged on the outer surface of the base wall 1; the integrated reinforcement structure is sequentially arranged from inside to outside as an interface bonding system 2, a core reinforcement system 3 and a functional protection system 4, and the three are coaxial and closely combined to form a whole; the interface bonding system 2 is in direct contact with the surface of the base wall 1, the core reinforcement system 3 is embedded between the interface bonding system 2 and the functional protection system 4, and the functional protection system 4 covers one side of the core reinforcement system 3 away from the interface bonding system 2.

[0032] Reference Figure 1 The interface bonding system 2 is a gradient connection structure, which comprises a penetration anchoring layer and a bonding transition layer; the penetration anchoring layer is arranged close to the base wall 1, and a plurality of penetration protrusions are arranged on the surface of the penetration anchoring layer; the penetration protrusions can be in the shapes of a cone, a column and the like, are made of a cement-based material with high strength or a composite material with certain flexibility, and are embedded into the surface layer of the base wall 1; the bonding transition layer covers one side of the penetration anchoring layer away from the base wall 1, is made of a polymer modified cement slurry with good bonding performance, and can play a transition and bonding role between the penetration anchoring layer and the core reinforcement system 3, so that the whole reinforcement structure is more stable.

[0033] Reference Figure 1 And Figure 2 The core reinforcement system 3 is arranged in a multi-scale fiber embedding structure, which comprises a continuous FRP grid 31, chopped fibers 32 and a cement-based composite material matrix 33; the continuous FRP grid 31 is arranged in a layer shape and has the advantages of light weight, high strength and corrosion resistance, and forms a macroscopic reinforcement framework, so that the bearing capacity of the wall can be improved.

[0034] The short fibers 32 are dispersedly distributed in the cement-based composite material matrix 33 and filled in the pores of the continuous FRP grid 31. When micro-cracks occur, the short fibers 32 can effectively transfer stress at both ends of the cracks and induce the matrix to generate a large number of dispersed micro-cracks, thereby endowing the material with tensile strain hardening capacity and super-high ductility similar to that of metal. The cement-based composite material matrix 33 covers the continuous FRP grid 31 and the short fibers 32 to form an integrated structure. The cement-based composite material matrix 33 is mixed by high-performance cement, mineral admixtures, and additives, thereby providing a stable support environment for the continuous FRP grid 31 and the short fibers 32, so that they can work cooperatively.

[0035] The interface compatibility layer 34 is arranged on the outer surface of the short fibers 32 and filled in the contact gap between the continuous FRP grid 31 and the cement-based composite material matrix 33. The interface compatibility layer 34 can improve the interface performance between the short fibers 32 and the cement-based composite material matrix 33, increase the bonding strength therebetween, and also fill the gap between the continuous FRP grid 31 and the cement-based composite material matrix 33, so that the entire core reinforcement system 3 is more compact and stable.

[0036] The continuous FRP grid 31 adopts a segmented structure and includes a plurality of grid units. The grid units are fixedly connected to each other. The grid units include straight lines and curves. The edges of adjacent grid units overlap each other to form an overlapping reinforcement area 311. The overlapping reinforcement area 311 is fixedly provided with a buckle type splicing piece 312. The overlapping reinforcement area 311 can further improve the integrity and strength of the continuous FRP grid 31 and is convenient for adapting to different shapes of the base wall 1.

[0037] The stress dispersion structure 35 is also arranged in the core reinforcement system 3. The stress dispersion structure 35 is a radial rib. The stress dispersion structure 35 is uniformly distributed along the thickness direction of the core reinforcement system 3 and extends radially towards the interface combination system 2. One end of the stress dispersion structure 35 is fixedly connected to the inner side wall of the core reinforcement system 3, and the other end extends into the interface combination system 2. The stress dispersion structure 35 can uniformly disperse the stress received by the core reinforcement system 3 to the interface combination system 2 and the base wall 1, reduce stress concentration, and improve the overall performance of the wall.

[0038] Reference Figure 1 and Figure 2 The integrated reinforcement structure further includes a shape adaptation structure 5 and an auxiliary fixing structure 6. The shape adaptation structure 5 is arranged between the interface combination system 2 and the core reinforcement system 3. The auxiliary fixing structure 6 penetrates the shape adaptation structure 5 and is detachably connected to the base wall 1.

[0039] The morphological adaptation structure 5 comprises a plurality of splicing units 51, each splicing unit 51 comprises a planar adaptation segment and a curved surface adaptation segment, the planar adaptation segment and the curved surface adaptation segment are hinged through a flexible connecting piece 52, a detachable buckle structure is arranged between adjacent splicing units 51 in the same plane, a plurality of positioning grooves are arranged on one side of the morphological adaptation structure 5 close to the core reinforcement system 3, and the continuous FRP grid 31 is embedded into the positioning grooves; the morphological adaptation structure 5 can be flexibly adjusted according to different morphologies of the base wall 1, and better adapt to planar walls and curved walls.

[0040] The auxiliary fixing structure 6 comprises a plurality of positioning rods 62 and limiting pieces 61, and is mainly applied to the curved segment base wall 1; the plurality of positioning rods 62 and the limiting pieces 61 are distributed along the area of the curved segment base wall 1 at intervals; one end of the positioning rod 62 penetrates through the morphological adaptation structure 5 and is inserted into the base wall 1, and the other end is threadedly connected with the limiting piece 61; and the limiting piece 61 is used for pressing the surface of the morphological adaptation structure 5.

[0041] Reference Figure 1 The functional protection system 4 is a composite layered structure, which comprises a corrosion-resistant layer 41 and a fire-resistant layer 42; the corrosion-resistant layer 41 is made of corrosion-resistant paint and directly covers the surface of the core reinforcement system 3, so that the core reinforcement system 3 is prevented from being corroded by the external environment, and the service life of the reinforcing structure is prolonged; the fire-resistant layer 42 is made of fire-resistant fibers, fire-resistant paint and other materials and covers the side of the corrosion-resistant layer 41 away from the core reinforcement system 3, so that the fireproof performance of the wall is improved and the safety of the building is enhanced; the edges of the corrosion-resistant layer 41 and the fire-resistant layer 42 are flush and closely attached.

[0042] The implementation principle of the multi-scale fiber reinforced cement new surface layer reinforcing technology and the construction method thereof is that: a flat construction foundation is created through base pretreatment, gradient connection construction of the interface combination system 2, modular assembly positioning of the morphological adaptation structure 5 and multi-scale embedding formation of the core reinforcement system 3 are sequentially completed, and the construction functional protection system 4 is constructed after curing, each process is carried out around the layered relationship of the integrated structure, the connection between the systems is ensured to be close and the positioning is ensured to be accurate, and finally a reinforcing whole with stable structure and strong adaptability is formed.

[0043] The embodiment of the application further discloses a construction method of the multi-scale fiber reinforced cement new surface layer reinforcing technology.

[0044] The construction method comprises the following steps: S1, base pretreatment, cleaning the surface of the base wall 1, removing impurities and repairing defects, and marking the installation position of the auxiliary fixing structure 6 on the surface of the base wall 1; S2, interface combination construction, constructing a permeable anchoring layer on the surface of the base wall 1, and constructing a bonding transition layer on the surface of the permeable anchoring layer after the permeable anchoring layer is cured, so as to form the interface combination system 2; S3, shape adaptation assembly, according to the shape of the base wall 1, the shape adaptation structure 5 is spliced with the splicing unit 51, the shape adaptation structure 5 is adhered to the surface of the transition layer, and the shape adaptation structure 5 is fixed on the base wall 1 through the auxiliary fixing structure 6; S4, reinforcement system laying, each grid unit of the continuous FRP grid 31 is spliced and fixed, embedded in the shape adaptation structure 5, and a macroscopic reinforcement skeleton is formed; S5, first base body forming, cement-based composite material is sprayed to the surface of the continuous FRP grid 31, the grid pores are filled, and an initial base layer is formed, and the initial base layer is compacted by a rolling device; S6, micro-reinforcement construction, chopped fibers 32 are laid on the surface of the uninitially set initial base layer to ensure uniform dispersion of the chopped fibers 32; S7, second base body forming, cement-based composite material is continuously sprayed to cover the chopped fibers 32 and reach the designed thickness, a core reinforcement system 3 is formed, and then surface leveling is performed; S8, curing, the core reinforcement system 3 is maintained and cured until complete curing; S9, functional protection construction, a corrosion-resistant layer 41 and a fire-resistant layer 42 are sequentially constructed on the surface of the core reinforcement system 3 to form a functional protection system 4, and the integrated reinforcement structure construction is completed.

[0045] The embodiments of the specific embodiment are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. Multi-scale fiber reinforced cement novel facing reinforcement technology, comprising a base wall (1), characterized in that: The integrated reinforcing structure further comprises a form adapting structure (5) and an auxiliary fixing structure (6), the form adapting structure (5) is clamped between the interface bonding system (2) and the core reinforcing system (3), the auxiliary fixing structure (6) penetrates the form adapting structure (5), and the auxiliary fixing structure (6) is detachably connected with the base wall (1).

2. The multiscale fiber reinforced cement novel surface layer strengthening technology according to claim 1, characterized in that: The interface bonding system (2) comprises a penetration anchoring layer and a bonding transition layer, the penetration anchoring layer is arranged close to the base wall (1), and a plurality of penetration protrusions are arranged on the surface of the penetration anchoring layer, the penetration protrusions are embedded in the surface layer of the base wall (1), the bonding transition layer is fixed on the side of the penetration anchoring layer away from the base wall (1), and is directly attached with the core reinforcing system (3).

3. The multiscale fiber reinforced cement novel surface layer strengthening technology according to claim 1, characterized in that: The core reinforcing system (3) comprises a continuous FRP grid (31), a chopped fiber (32) and a cement-based composite material matrix (33), the continuous FRP grid (31) is arranged in layers, the chopped fiber (32) is dispersedly filled in the pores of the continuous FRP grid (31), and the cement-based composite material matrix (33) covers the continuous FRP grid (31) and the chopped fiber (32) to form an integral structure.

4. The multiscale fiber reinforced cement novel surface layer strengthening technology according to claim 3, characterized in that: The core reinforcing system (3) further comprises an interface compatible layer (34), the interface compatible layer (34) is uniformly covered on the outer surface of the chopped fiber (32) and filled in the contact gap between the continuous FRP grid (31) and the cement-based composite material matrix (33).

5. The multiscale fiber reinforced cement novel surface layer strengthening technology according to claim 3, characterized in that: The continuous FRP grid (31) adopts a segmented structure, which comprises a plurality of grid units, the edges of adjacent grid units are overlapped to form an overlapping reinforcing area (311), and a buckle type splicing piece (312) is fixedly arranged on the overlapping reinforcing area (311).

6. The multiscale fiber reinforced cement novel surface layer strengthening technology according to claim 1, characterized in that: The form adapting structure (5) comprises a plurality of splicing units (51), each splicing unit (51) comprises a planar adapting section and a curved adapting section, and the planar adapting section and the curved adapting section are hinged through a flexible connecting piece (52).

7. The multiscale fiber reinforced cement novel surface layer strengthening technology according to claim 1, characterized in that: The functional protection system (4) comprises a corrosion resistant layer (41) and a flame retardant layer (42), the corrosion resistant layer (41) is directly covered on the surface of the core reinforcing system (3), the flame retardant layer (42) is covered on the side of the corrosion resistant layer (41) away from the core reinforcing system (3), and the edges of the corrosion resistant layer (41) and the flame retardant layer (42) are flush and closely attached.

8. The multiscale fiber reinforced cement novel surface layer strengthening technology according to claim 1, characterized in that: The core reinforcing system (3) is provided with a stress dispersion structure (35), the stress dispersion structure (35) is a rib structure, one end of the stress dispersion structure (35) is fixedly connected with the inner side wall of the core reinforcing system (3), and the other end extends into the interface bonding system (2).

9. The multiscale fiber reinforced cement novel surface layer strengthening technology according to claim 1, characterized in that: The auxiliary fixing structure (6) comprises a positioning rod (62) and a limiting piece (61), one end of the positioning rod (62) is inserted into the base wall (1), the other end is threadedly connected with the limiting piece (61), and the limiting piece (61) is pressed against the surface of the form fitting structure (5).

10. A method for the construction of a multi-scale fiber reinforced cementitious novel surface layer reinforcement technology, suitable for the multi-scale fiber reinforced cementitious novel surface layer reinforcement technology according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1, base layer pretreatment, cleaning the surface of the base wall (1), removing impurities and repairing defects, and marking the installation position of the auxiliary fixing structure (6) on the surface of the base wall (1); S2, interface bonding construction, constructing a permeation anchoring layer on the surface of the base wall (1), and after the permeation anchoring layer is cured, constructing a bonding transition layer on the surface thereof to form an interface bonding system (2); S3, form fitting assembly, according to the form of the base wall (1), splicing units (51) of the form fitting structure (5) are spliced, the form fitting structure (5) is attached to the surface of the bonding transition layer, and the form fitting structure (5) is fixed to the base wall (1) through the auxiliary fixing structure (6); S4, laying of the reinforcing system, splicing and fixing each grid unit of the continuous FRP grid (31), embedding the form fitting structure (5) to form a macroscopic reinforcing framework; S5, first base body forming, spraying cement-based composite material on the surface of the continuous FRP grid (31) to fill the grid pores and form an initial base layer, and compacting by a rolling device; S6, micro-reinforcement construction, laying chopped fibers (32) on the surface of the uninitially-cured initial base layer to ensure uniform dispersion of the chopped fibers (32); S7, second base body forming, continuously spraying cement-based composite material to cover the chopped fibers (32) and reach the designed thickness to form a core reinforcing system (3), and then performing surface leveling; S8, curing, moisturizing and curing the core reinforcing system (3) until complete curing; S9, functional protection construction, sequentially constructing a corrosion-resistant layer (41) and a flame-retardant layer (42) on the surface of the core reinforcing system (3) to form a functional protection system (4), and completing the construction of the integrated reinforcing structure.

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