Multi-form fiber mixing reinforced cement base plate and preparation method thereof

Abstract

The invention relates to a cement base plate and a preparation method, in particular to a multiform fiber mixed reinforced cement base plate and a preparation method, and aims to solve the problems that a three-dimensional fiber grid reinforced concrete plate is limited in size, large-size plates cannot be prepared, and self-cracking occurs after the thickness of a protective layer is reserved. The first protection layer, the first three-dimensional fiber grid, the spacing layer, the second three-dimensional fiber grid and the second protection layer are fixedly connected in sequence, and the first three-dimensional fiber grid and the second three-dimensional fiber grid are filled with the base body. The method comprises the steps that firstly, the three-dimensional fiber grids are cut, assembled and transversely spliced and connected; 2, a mold is manufactured, and the inner side face of the mold is coated with a release agent; step 3, preparing a cement-based matrix; 4, preparing a first protective layer; and fifthly, a cement-based matrix is sprayed to the first protection layer till a second protection layer is formed, the cement-based matrix is solidified, and demolding maintenance is conducted. The invention belongs to the field of buildings.

Description

Technical Field

[0001] The present invention relates to a cement substrate and a preparation method thereof, and particularly to a cement substrate with multi-form fiber hybrid reinforcement and a preparation method thereof. The present invention belongs to the field of construction. Background Art

[0002] With the continuous development of the construction industry, the demand for lightweight thin-walled structures is increasing day by day, and fiber-reinforced cement-based boards have emerged as the times require. At present, according to the different fiber forms, the fiber used for cement-based boards can be divided into short-cut fiber-reinforced cement substrates with one-dimensional reinforcement, fiber woven mesh-reinforced cement substrates with two-dimensional reinforcement, and three-dimensional fiber grid-reinforced cement substrates with three-dimensional reinforcement. The short-cut fiber-reinforced cement substrate is one of the most widely used materials in current building curtain walls. Its preparation process is simple and can effectively improve the brittleness of cement-based materials. The fiber woven mesh is composed of warp and weft yarns that crisscross each other, with various forms and good reinforcement efficiency. As a spatially integral continuous reinforcement, the three-dimensional fiber grid can effectively improve the reinforcement efficiency. Therefore, the three-dimensional fiber grid-reinforced cement substrate is a new type of building material with good performance and has broad prospects in the application of plate components.

[0003] The short-cut fibers are randomly distributed in the cement matrix and have low reinforcement efficiency, making it difficult for the basic mechanical properties such as flexural and tensile strength of the short-cut fiber-reinforced cement-based boards to meet the building requirements. The fiber woven mesh-reinforced cement-based materials have the problem of easy delamination and are prone to interlayer tearing failure during the bending process. The three-dimensional fiber grid can overcome the shortcomings of short-cut fibers and fiber woven meshes as reinforcements, but there are two problems with the three-dimensional fiber grid-reinforced concrete slab: 1. Limited by the weaving process, the size of the three-dimensional fiber grid is limited, which also limits the size of the slab to a certain extent and large-size slabs cannot be prepared. 2. The three-dimensional fiber grid-reinforced concrete slab requires a relatively thin protective layer to meet the needs of interface performance and avoid problems such as poor decorative effects caused by exposed steel bars. However, after reserving the protective layer thickness, the large-size three-dimensional fiber grid-reinforced cement-based curtain wall slab will crack spontaneously during the curing process due to uneven shrinkage and other problems, and is also prone to premature cracking under the influence of external forces during transportation and installation, affecting its safety and aesthetics during use. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems that the size of the three-dimensional fiber grid-reinforced concrete slab is limited, large-size slabs cannot be prepared, and spontaneous cracking will occur after reserving the protective layer thickness, and then to provide a cement substrate with multi-form fiber hybrid reinforcement and a preparation method thereof.

[0005] The technical solution of the present invention is as follows:

[0006] A cement substrate with multi-form fiber hybrid reinforcement, which comprises a first three-dimensional fiber grid, a second three-dimensional fiber grid, a spacer layer, a first protective layer, a second protective layer, and a matrix;

[0007] The first protective layer, the first three-dimensional fiber grid, the spacer layer, the second three-dimensional fiber grid, and the second protective layer are fixedly connected in sequence. The matrix is filled in the first three-dimensional fiber grid and the second three-dimensional fiber grid.

[0008] Furthermore, the first three-dimensional fiber grid includes a first upper fiber net, a first lower fiber net, and a first intermediate connecting core column;

[0009] The first upper fiber net and the first lower fiber net are arranged oppositely, and the first upper fiber net and the first lower fiber net are connected by the first intermediate connecting core column.

[0010] Furthermore, the second three-dimensional fiber grid includes a second upper fiber net, a second lower fiber net, and a second intermediate connecting core column;

[0011] The second upper fiber net and the second lower fiber net are arranged oppositely, and the second upper fiber net and the second lower fiber net are connected by the second intermediate connecting core column.

[0012] Furthermore, the first upper fiber net includes at least two first upper fiber meshes and a plurality of connecting steel rings, the first lower fiber net includes at least two first lower fiber meshes and a plurality of connecting steel rings, the second upper fiber net includes at least two second upper fiber meshes and a plurality of connecting steel rings, and the second lower fiber net includes at least two second lower fiber meshes and a plurality of connecting steel rings;

[0013] At least two first upper fiber meshes are spliced in sequence, and adjacent spliced first upper fiber meshes are connected and fixed by a plurality of connecting steel rings. At least two first lower fiber meshes are spliced in sequence, and adjacent spliced first lower fiber meshes are connected and fixed by a plurality of connecting steel rings. At least two second upper fiber meshes are spliced in sequence, and adjacent spliced second upper fiber meshes are connected and fixed by a plurality of connecting steel rings. At least two second lower fiber meshes are spliced in sequence, and adjacent spliced second lower fiber meshes are connected and fixed by a plurality of connecting steel rings. The connecting steel rings on the first upper fiber meshes, the connecting steel rings on the first lower fiber meshes, the connecting steel rings on the second upper fiber meshes, and the connecting steel rings on the second lower fiber meshes are staggered in the vertical direction.

[0014] Furthermore, both the first intermediate connecting core column and the second intermediate connecting core column are composed of multiple rows of fiber bundles, and each row of fiber bundles is formed by two fiber bundles crossing and shuttling. The top of each row of fiber bundles on the first three-dimensional fiber grid is interwoven with the first upper fiber net, and the bottom of each row of fiber bundles is interwoven with the first lower fiber net. The top of each row of fiber bundles on the second three-dimensional fiber grid is interwoven with the second upper fiber net, and the bottom of each row of fiber bundles is interwoven with the second lower fiber net.

[0015] Further, the first upper fiber grid, the first lower fiber grid, the second upper fiber grid, and the second lower fiber grid are all net structures formed by the interweaving of warp and weft fibers.

[0016] Further, the spacer layer, the first protective layer, the second protective layer, and the matrix are all made of a cement-based material containing short-cut fibers.

[0017] A preparation method of a multi-form fiber hybrid reinforced cement substrate,

[0018] Step 1: Cutting, assembling, and horizontally assembling and connecting the three-dimensional fiber grid;

[0019] Step 2: Making a mold and applying a mold release agent on the inner surface of the mold;

[0020] Step 3: Preparing a cement-based matrix, where the mass ratio of short-cut fibers in the cement-based matrix is 2% - 5%;

[0021] Step 4: Preparing the first protective layer;

[0022] Step 5: Laying the first three-dimensional fiber grid prepared in Step 1 on the first protective layer, then spraying the cement-based matrix and covering the first three-dimensional fiber grid. After covering the first three-dimensional fiber grid, continue to spray the cement-based matrix to form a spacer layer. After the spacer layer spraying is completed, place the second three-dimensional fiber grid on the spacer layer and continue to spray the cement-based matrix, and cover the second three-dimensional fiber grid. After covering the first three-dimensional fiber grid, continue to spray the cement-based matrix to form a second protective layer;

[0023] Step 6: After the second protective layer spraying is completed, perform a leveling treatment;

[0024] Step 7: After one day, the cement-based matrix solidifies, and demolding and curing are carried out.

[0025] Further, in Step 1, the first upper fiber grid, the first lower fiber grid, the second upper fiber grid, and the second lower fiber grid are cut, and the cut fiber grids and the core columns are impregnated with styrene-acrylic emulsion.

[0026] At least two aligned first upper fiber grids are connected by the connecting steel rings of the loop former to form a large-sized first upper fiber layer net, at least two aligned first lower fiber grids are connected by the connecting steel rings of the loop former to form a large-sized first lower fiber layer net, at least two aligned second upper fiber grids are connected by the connecting steel rings of the loop former to form a large-sized second upper fiber layer net, and at least two aligned second lower fiber grids are connected by the connecting steel rings of the loop former to form a large-sized second lower fiber layer net;

[0027] In Step 3, the cement-based material is one of cement mortar, fine concrete, foam concrete, glass fiber reinforced concrete, or ultra-high performance concrete;

[0028] In Step 4, when preparing the first protective layer, a cement-based material is sprayed into the mold coated with a release agent to form the thickness of the first protective layer, and then it is ground and leveled.

[0029] When forming the matrix protection outer layer, a cement-based material with a thickness of 2 - 4 mm is sprayed into the matrix protection outer layer mold and then leveled.

[0030] In Step 5, the first three-dimensional fiber grid and the second three-dimensional fiber grid made in Step 1 are placed on the cement-based material in Step 4, and a cement-based material is sprayed onto the first three-dimensional fiber grid and the second three-dimensional fiber grid to make the cement-based material sprayed inside the first three-dimensional fiber grid and the second three-dimensional fiber grid uniform. Then, a cement-based material for the matrix protection inner layer is sprayed on the top to reach the thickness of the matrix protection inner layer and then ground and leveled.

[0031] Furthermore, the distance for installing the connecting steel rings on the first upper fiber grid, the first lower fiber grid, the second upper fiber grid, and the second lower fiber grid is twice the distance of the warp yarns.

[0032] The present invention has the following effects compared with the prior art:

[0033] 1. This application uses chopped fibers and three-dimensional fiber grids as reinforcement to form a multi-form fiber hybrid reinforced cement board, which not only solves the problem of low reinforcement efficiency of chopped fibers but also overcomes the drawback of pre-cracking of the three-dimensional fiber grid reinforced cement-based board before use.

[0034] 2. This application uses a continuously reinforced three-dimensional fiber grid as the reinforcement and arranges it along the principal stress direction. The continuous fiber bundles arranged along the principal stress direction can effectively bear the tensile stress transferred from the matrix and transfer the tensile stress efficiently, greatly improving the mechanical properties of the board and facilitating the lightweight design of the board.

[0035] 3. The reason for the pre-cracking of the prior art protective layer made of pure cement-based material is as follows: During the concrete curing stage, the autogenous shrinkage is uneven; during transportation and installation, it is inevitable to be subjected to its own weight or external loads, and the tensile strength of plain concrete is low, so it is easy to crack under a relatively low load level. This application incorporates a certain amount of chopped fibers. The chopped fibers can limit the shrinkage of the concrete slab, resolve the problem of uneven autogenous shrinkage to a certain extent, and prevent autogenous shrinkage cracking during the curing stage. On the other hand, after the chopped fibers are combined with the cement-based material, the tensile stress received by the specimen can be transferred to the chopped fibers through the interfacial properties of the two, solving the cracking problem during transportation, installation, and other operations.

[0036] 4. Monolithic grids in the prior art often cannot achieve the preparation of large-sized plates. If multiple grids are simply placed together without connection measures, when subjected to external loads, the force transmission ability of the reinforcement is weakened, resulting in premature failure. After being fixedly connected by the connecting steel ring in this application, the connecting steel ring can be used as an auxiliary for force transmission, enabling the effective transmission of tensile stress at the connection

[0037] 5. The connecting steel rings in this application are arranged in a staggered manner, which can disperse discontinuities and avoid excessive reduction in performance caused by excessive weakness in a certain cross-section.

[0038] 6. The spacer layer 3, the first protective layer 4, the second protective layer 5, and the matrix 6 in this application are incorporated with short-cut fibers. Since the incorporation of short-cut fibers improves the interfacial performance between the three-dimensional grid and the matrix, it further improves the load-bearing capacity of the plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is the front view of the overall structure of this application;

[0040] Figure 2 is a schematic diagram of the connecting steel ring in the same vertical plane. This figure easily makes the connecting surface of the steel ring a weak area, reducing the service performance. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0042] DETAILED DESCRIPTION OF THE EMBODIMENT 1: In combination with Figure 1 This embodiment is described. A multi-form fiber-reinforced cement substrate in this embodiment includes a first three-dimensional fiber grid 1, a second three-dimensional fiber grid 2, a spacer layer 3, a first protective layer 4, a second protective layer 5, and a matrix 6;

[0043] The first protective layer 4, the first three-dimensional fiber grid 1, the spacer layer 3, the second three-dimensional fiber grid 2, and the second protective layer 5 are fixedly connected in sequence, and the matrix 6 is filled in the first three-dimensional fiber grid 1 and the second three-dimensional fiber grid 2.

[0044] In this embodiment, the three-dimensional fiber grid is a fabric woven from continuous fiber bundles, with its weft and warp yarns intersecting vertically and horizontally. The continuous weaving of the fiber bundles can improve the reinforcement efficiency as a cement-based reinforcement, thereby enhancing the load-bearing capacity of the folded plate. The first three-dimensional fiber grid 1 and the second three-dimensional fiber grid 2 include, but are not limited to, glass fiber three-dimensional grids, carbon fiber three-dimensional grids, and basalt fiber three-dimensional grids. A continuously reinforced three-dimensional fiber grid is used as the reinforcement and is arranged along the principal stress direction. The continuous fiber bundles arranged along the principal stress direction can effectively bear the tensile stress transmitted from the matrix and efficiently transmit the tensile stress, greatly improving the mechanical properties of the plate. Using a three-dimensional fiber grid mixture as the main reinforcement, the reinforced three-dimensional fiber grid has a higher reinforcement efficiency than one-dimensional short-cut fibers and two-dimensional fiber woven meshes, significantly improving the load-bearing capacity of the plate and reducing the plate thickness.

[0045] Specific Embodiment 2: With reference to Figure 1 To illustrate this embodiment, a multi-form fiber hybrid reinforced cement substrate in this embodiment, the first three-dimensional fiber grid 1 includes a first upper fiber mesh, a first lower fiber mesh, and a first intermediate connecting core column;

[0046] The first upper fiber mesh and the first lower fiber mesh are arranged opposite to each other, and the first upper fiber mesh and the first lower fiber mesh are connected by the first intermediate connecting core column. Other compositions and connection relationships are the same as those in Specific Embodiment 1.

[0047] Specific Embodiment 3: With reference to Figure 1 To illustrate this embodiment, a multi-form fiber hybrid reinforced cement substrate in this embodiment, the second three-dimensional fiber grid 2 includes a second upper fiber mesh, a second lower fiber mesh, and a second intermediate connecting core column;

[0048] The second upper fiber mesh and the second lower fiber mesh are arranged opposite to each other, and the second upper fiber mesh and the second lower fiber mesh are connected by the second intermediate connecting core column. Other compositions and connection relationships are the same as those in Specific Embodiment 1.

[0049] Specific Embodiment 4: With reference to Figure 1 To illustrate this embodiment, a multi-form fiber hybrid reinforced cement substrate in this embodiment, the first upper fiber mesh includes at least two first upper fiber grids and a plurality of connecting steel rings, the first lower fiber mesh includes at least two first lower fiber grids and a plurality of connecting steel rings, the second upper fiber mesh includes at least two second upper fiber grids and a plurality of connecting steel rings, and the second lower fiber mesh includes at least two second lower fiber grids and a plurality of connecting steel rings;

[0050] At least two first fiber upper grids are spliced and arranged in sequence, and two adjacent spliced first fiber upper grids are connected and fixed by multiple connecting steel rings. At least two first fiber lower grids are spliced and arranged in sequence, and two adjacent spliced first fiber lower grids are connected and fixed by multiple connecting steel rings. At least two second fiber upper grids are spliced and arranged in sequence, and two adjacent spliced second fiber upper grids are connected and fixed by multiple connecting steel rings. At least two second fiber lower grids are spliced and arranged in sequence, and two adjacent spliced second fiber lower grids are connected and fixed by multiple connecting steel rings. The connecting steel rings on the first fiber upper grid, the connecting steel rings on the first fiber lower grid, the connecting steel rings on the second fiber upper grid, and the connecting steel rings on the second fiber lower grid are staggered in the vertical direction. The staggered connection positions of each layer of steel rings can avoid a certain cross section from becoming an excessively weak section, thereby improving the connection efficiency. The other components and connection relationships are the same as those in the second or third specific embodiments.

[0051] Due to size limitations during use, a single piece of mesh often cannot be used to prepare large-sized panels. If multiple pieces of mesh are simply put together without taking connection measures, the force transmission capacity of the reinforcement will be weakened when subjected to external loads, leading to premature failure. In this embodiment, after being connected through steel rings, the steel rings can be used as an auxiliary force transmission to effectively transmit tensile stress at the connection. Connecting multiple pieces of three-dimensional fiber mesh through steel rings breaks through the size limitations of the three-dimensional fiber mesh and can be used to prepare large-sized three-dimensional fiber mesh reinforced cement-based panels.

[0052] Specific implementation method five: Combination Figure 1 This embodiment describes a multi-form fiber-compound reinforced cement substrate. Both the first and second intermediate connecting cores are composed of multiple rows of fiber bundles, with each row of fiber bundles formed by two fiber bundles interlaced and interwoven. In the first three-dimensional fiber grid 1, the top of each row of fiber bundles is interwoven with the first upper fiber mesh, and the bottom of each row of fiber bundles is interwoven with the first lower fiber mesh. In the second three-dimensional fiber grid 2, the top of each row of fiber bundles is interwoven with the second upper fiber mesh, and the bottom of each row of fiber bundles is interwoven with the second lower fiber mesh. Other components and connection relationships are the same as those in the fourth embodiment.

[0053] Specific implementation method six: combination Figure 1 This embodiment describes a multi-form fiber-compound reinforced cement substrate. The first upper fiber grid, the first lower fiber grid, the second upper fiber grid, and the second lower fiber grid are all mesh structures interwoven with warp and weft fibers. The remaining components and connections are the same as those in the fourth embodiment.

[0054] Specific implementation method seven: combination Figure 1To describe this embodiment, a multi-form fiber hybrid reinforced cement substrate of this embodiment, the spacer layer 3, the first protective layer 4, the second protective layer 5 and the matrix 6 are all made of a cement-based material containing chopped fibers. A small amount of chopped fibers is incorporated into the three-dimensional fiber grid matrix 6. Since the incorporation of chopped fibers improves the interfacial properties between the three-dimensional grid and the matrix, it further enhances the load-bearing capacity of the board. The other compositions and connection relationships are the same as those in the first specific embodiment.

[0055] A certain amount of chopped fibers is incorporated into the cement-based material. The chopped fibers can limit the shrinkage of the concrete slab and resolve the problem of uneven autogenous shrinkage to a certain extent. After incorporating an appropriate amount of chopped fibers, the interfacial properties between the three-dimensional fiber grid and the cement-based matrix can be effectively improved, further enhancing the reinforcement efficiency of the three-dimensional grid and improving the crack resistance of the board. On the other hand, after the chopped fibers are combined with the cement-based material, the tensile stress received by the specimen can be transmitted to the chopped fibers through the interfacial properties of the two, solving the cracking problem during transportation, installation and other operations. The materials of the chopped fibers include but are not limited to organic fibers, glass fibers, and basalt fibers. The mass ratio of the chopped fibers is 2%-5%. When the mass ratio of the chopped fibers is 4%, the strength effect of the cement substrate is the best. The cementitious material, aggregate, chopped fibers, water and other materials of the cement-based material are configured in proportion and poured into a mixer and mixed evenly.

[0056] In this embodiment, the cement-based material includes but is not limited to cement mortar, fine concrete, and foam concrete. Only the maximum aggregate size needs to be controlled to be smaller than the grid size to ensure that the matrix can fill the entire mold to avoid the prepared board from being non-dense.

[0057] Specific embodiment eight: Combine Figure 1 To describe this embodiment, a preparation method of a multi-form fiber hybrid reinforced cement substrate of this embodiment,

[0058] Step 1: Cutting, assembling and horizontally assembling and connecting the three-dimensional fiber grid;

[0059] Step 2: Make a mold and apply a release agent on the inner side of the mold;

[0060] Step 3: Prepare the cement-based matrix, and the mass ratio of chopped fibers in the cement-based matrix is 2%-5%; when the mass ratio of chopped fibers is 4%, the strength effect of the cement substrate is the best;

[0061] Step 4: Prepare the first protective layer 4;

[0062] Step 5: Lay the first three-dimensional fiber grid 1 prepared in Step 1 on the first protective layer 4, then spray the cement-based matrix and cover the first three-dimensional fiber grid 1. After covering the first three-dimensional fiber grid 1, continue to spray the cement-based matrix to form the spacer layer 3. After the spraying of the spacer layer 3 is completed, place the second three-dimensional fiber grid 2 on the spacer layer 3 and continue to spray the cement-based matrix, and cover the second three-dimensional fiber grid 2. After covering the first three-dimensional fiber grid 1, continue to spray the cement-based matrix to form the second protective layer 5;

[0063] Step 6: After the spraying of the second protective layer 5 is completed, perform a leveling treatment;

[0064] Step 7: One day later, the cement-based matrix solidifies, and demolding and curing are carried out.

[0065] Specific Embodiment 9: Combining Figure 1 To illustrate this embodiment, a preparation method of a multi-form fiber hybrid reinforced cement board of this embodiment

[0066] In Step 1, the first fiber upper grid, the first fiber lower grid, the second fiber upper grid, and the second fiber lower grid are cut, and the cut fiber grids and the core columns are impregnated with styrene-acrylic emulsion.

[0067] Connect at least two aligned first fiber upper grids through the connecting steel rings of the looping device to form a large-size first fiber upper layer net, connect at least two aligned first fiber lower grids through the connecting steel rings of the looping device to form a large-size first fiber lower layer net, connect at least two aligned second fiber upper grids through the connecting steel rings of the looping device to form a large-size second fiber upper layer net, and connect at least two aligned second fiber lower grids through the connecting steel rings of the looping device to form a large-size second fiber lower layer net;

[0068] In Step 3, the cement-based material is one of cement mortar, fine concrete, foam concrete, glass fiber reinforced concrete, or ultra-high performance concrete;

[0069] When preparing the first protective layer 4 in Step 4, spray the cement-based material into the mold coated with the release agent to form the thickness of the first protective layer 4 and perform a grinding and leveling treatment.

[0070] When spraying the matrix protection outer layer, spray the cement-based material with a thickness of 2-4 mm into the matrix protection outer layer mold and perform a leveling treatment;

[0071] In Step 5, place the first three-dimensional fiber grid 1 and the second three-dimensional fiber grid 2 made in Step 1 on the cement-based material in Step 4, and spray the cement-based material onto the first three-dimensional fiber grid 1 and the second three-dimensional fiber grid 2 to make the cement-based material sprayed inside the first three-dimensional fiber grid 1 and the second three-dimensional fiber grid 2 uniform, and spray the cement-based material for the inner layer of the matrix protection above, until reaching the thickness of the inner layer of the matrix protection and performing a smoothing treatment. Other compositions and connection relationships are the same as those in the eighth specific implementation manner.

[0072] Specific implementation manner ten: Combine Figure 1 To illustrate this implementation manner, a preparation method of a multi-form fiber hybrid reinforced cement substrate in this implementation manner

[0073] The distance for installing the connecting steel rings on the first upper fiber grid, the first lower fiber grid, the second upper fiber grid, and the second lower fiber grid is twice the distance of the warp yarn. Other compositions and connection relationships are the same as those in the ninth specific implementation manner.

[0074] Note that the above are only the preferred embodiments of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A multi-form fiber hybrid reinforced cement substrate, characterized by: It comprises a first three-dimensional fiber grid (1), a second three-dimensional fiber grid (2), a spacer layer (3), a first protective layer (4), a second protective layer (5) and a matrix (6); The first protective layer (4), the first three-dimensional fiber grid (1), the spacer layer (3), the second three-dimensional fiber grid (2), and the second protective layer (5) are fixedly connected in sequence, and the first three-dimensional fiber grid (1) and the second three-dimensional fiber grid (2) are filled with a matrix (6).

2. The multi-form fiber hybrid reinforced cement substrate according to claim 1, wherein: The first three-dimensional fiber grid (1) comprises a first fiber upper layer web, a first fiber lower layer web and a first middle connecting core column; The first upper fiber web and the first lower fiber web are arranged opposite to each other, and the first upper fiber web and the first lower fiber web are connected by a first middle connecting core column.

3. The multi-form fiber hybrid reinforced cement substrate according to claim 1, characterized in that: The second three-dimensional fiber grid (2) comprises a second fiber upper layer net, a second fiber lower layer net and a second middle connecting core column; The second upper fiber web and the second lower fiber web are arranged opposite to each other, and the second upper fiber web and the second lower fiber web are connected by a second middle connecting core column.

4. The multi-form fiber hybrid reinforced cement substrate according to claim 2 or 3, characterized in that: The first fiber upper layer net includes at least two first fiber upper grids and a plurality of connecting steel rings, the first fiber lower layer net includes at least two first fiber lower grids and a plurality of connecting steel rings, the second fiber upper layer net includes at least two second fiber upper grids and a plurality of connecting steel rings, and the second fiber lower layer net includes at least two second fiber lower grids and a plurality of connecting steel rings; At least two first fiber upper grids are spliced and arranged in sequence, and two adjacent spliced first fiber upper grids are connected and fixed by multiple connecting steel rings. At least two first fiber lower grids are spliced and arranged in sequence, and two adjacent spliced first fiber lower grids are connected and fixed by multiple connecting steel rings. At least two second fiber upper grids are spliced and arranged in sequence, and two adjacent spliced second fiber upper grids are connected and fixed by multiple connecting steel rings. At least two second fiber lower grids are spliced and arranged in sequence, and two adjacent spliced second fiber lower grids are connected and fixed by multiple connecting steel rings. The connecting steel rings on the first fiber upper grid, the connecting steel rings on the first fiber lower grid, the connecting steel rings on the second fiber upper grid, and the connecting steel rings on the second fiber lower grid are staggered in the vertical direction.

5. The multi-form fiber hybrid reinforced cement substrate according to claim 4, characterized in that: The first intermediate connecting core column and the second intermediate connecting core column are both composed of multiple rows of fiber bundles, and each row of fiber bundles is formed by two fiber bundles crossing and shuttling. The top of each row of fiber bundles on the first three-dimensional fiber grid (1) is interwoven with the first fiber upper layer net, and the bottom of each row of fiber bundles is interwoven with the first fiber lower layer net. The top of each row of fiber bundles on the second three-dimensional fiber grid (2) is interwoven with the second fiber upper layer net, and the bottom of each row of fiber bundles is interwoven with the second fiber lower layer net.

6. The multi-form fiber hybrid reinforced cement substrate according to claim 4, characterized in that: The first fiber upper grid, the first fiber lower grid, the second fiber upper grid and the second fiber lower grid are all mesh structures formed by interweaving warp and weft fibers.

7. The multi-form fiber hybrid reinforced cement substrate according to claim 1, characterized in that: The spacer layer (3), the first protective layer (4), the second protective layer (5) and the matrix (6) are all made of a cement-based material containing chopped fibers.

8. A method for preparing a multi-form fiber hybrid reinforced cement substrate according to any one of claims 1 to 7, characterized in that: Step 1: Cutting, assembling and horizontally connecting the three-dimensional fiber grid; Step 2: Manufacture a mold and apply a release agent to the inner side of the mold; Step 3: Prepare a cement-based matrix, and the mass ratio of the chopped fibers in the cement-based matrix is 2%-5%; Step 4: Prepare the first protective layer (4); Step 5: Lay the first three-dimensional fiber grid (1) prepared in Step 1 on the first protective layer (4), then spray the cement-based matrix and cover the first three-dimensional fiber grid (1). After covering the first three-dimensional fiber grid (1), continue to spray the cement-based matrix to form a spacer layer (3). After the spraying of the spacer layer (3) is completed, place the second three-dimensional fiber grid (2) on the spacer layer (3) and continue to spray the cement-based matrix, and cover the second three-dimensional fiber grid (2). After covering the first three-dimensional fiber grid (1), continue to spray the cement-based matrix to form a second protective layer (5); Step 6: After the spraying of the second protective layer (5) is completed, perform a leveling treatment; Step 7: After one day, the cement-based matrix solidifies, and demolding and curing are carried out.

9. The preparation method of a multi-form fiber hybrid reinforced cement-based board according to claim 8, characterized in that: In Step 1, the first fiber upper grid, the first fiber lower grid, the second fiber upper grid, and the second fiber lower grid are cut, and the cut fiber grids and the core columns are impregnated with styrene-acrylic emulsion. At least two aligned first fiber upper grids are connected by the connecting steel rings of the looping device to form a large-sized first fiber upper layer net, at least two aligned first fiber lower grids are connected by the connecting steel rings of the looping device to form a large-sized first fiber lower layer net, at least two aligned second fiber upper grids are connected by the connecting steel rings of the looping device to form a large-sized second fiber upper layer net, and at least two aligned second fiber lower grids are connected by the connecting steel rings of the looping device to form a large-sized second fiber lower layer net; In Step 3, the cement-based material is one of cement mortar, fine concrete, foam concrete, glass fiber reinforced concrete, or ultra-high performance concrete; When preparing the first protective layer (4) in Step 4, spray the cement-based material into the mold coated with the release agent to form the thickness of the first protective layer (4) and perform a grinding and leveling treatment; When spraying the outer layer of the matrix protection, spray the cement-based material with a thickness of 2-4 mm into the mold for the outer layer of the matrix protection and perform a leveling treatment; In Step 5, place the first three-dimensional fiber grid (1) and the second three-dimensional fiber grid (2) made in Step 1 on the cement-based material in Step 4, and spray the cement-based material on the first three-dimensional fiber grid (1) and the second three-dimensional fiber grid (2) to make the cement-based material sprayed in the first three-dimensional fiber grid (1) and the second three-dimensional fiber grid (2) uniform, and spray the cement-based material for the inner layer of the matrix protection above to reach the thickness of the inner layer of the matrix protection and perform a grinding and leveling treatment.

10. The preparation method of a three-dimensional fiber grid reinforced cement-based bent special-shaped board according to claim 9, characterized in that: The distance between the connecting steel rings installed on the first fiber upper grid, the first fiber lower grid, the second fiber upper grid, and the second fiber lower grid is twice the distance of the warp yarns.

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