Rigid-elastic composite plate and preparation method thereof, and method for preventing and controlling reflective cracks

Abstract

A rigid-elastic composite plate and a preparation method thereof, as well as a method for preventing and controlling reflective cracks, belong to the technical field of road pavement crack prevention and control. The rigid-elastic composite plate is formed by hot-melting a solid elastic carrier and a high-strength metal mesh arranged therein. Composite plate preparation method: After placing the high-strength metal mesh and the raw materials of the solid elastic carrier in a hot-melt mold, heat and pressurize to melt the raw materials of the solid elastic carrier and wrap the high-strength metal mesh, release the external pressure to zero and cool to room temperature to form a rigid-elastic composite plate. Method for preventing and controlling reflective cracks: Spread a tack layer of asphalt or engineering adhesive on the joints or cracks on the top surface of an old cement concrete pavement or an old asphalt pavement, and then lay the composite plate on the joints or cracks, and then directly lay an asphalt mixture overlay. That is, laying the composite plate on the cracks before laying the asphalt mixture overlay on the old pavement can effectively prevent and control upward reflective cracks at the existing crack positions of the old pavement after laying the asphalt mixture overlay.

Description

Technical Field

[0001] The invention belongs to the technical field of road pavement crack prevention and treatment, and specifically relates to a rigid-elastic composite plate and a preparation method thereof, as well as a method for preventing and treating reflective cracks. Background Art

[0002] Cement concrete pavement is one of the main pavement structures of early high-grade highways. The upgrading and reconstruction measures of old cement concrete pavement are usually mainly to add asphalt concrete surface layer. In the cement concrete pavement and asphalt concrete pavement ("white plus black") project, the joints of the old cement concrete pavement slabs (mainly longitudinal construction joints and transverse shrinkage joints without dowel bars) and the single and obvious cracks in the pavement slab body caused by different reasons will produce relatively concentrated load stress under the action of traffic loads. At the same time, the joints (or cracks) are also the locations where thermal shrinkage deformation and thermal shrinkage stress are concentrated. Therefore, after the completion of the "white plus black" project, corresponding to the joints (or cracks) of the old cement concrete pavement slabs, more reflective cracks will generally form in the added asphalt pavement. The time for a large number of cracks to appear is about 1 to 2 years at the fastest and 3 to 5 years at the slowest. After the reflection cracks are formed, precipitation damage and freeze-thaw action will cause great harm to the pavement structure layer, especially the asphalt concrete layer. In addition, the diseases caused by the load at the crack position continue to develop, and the service life of the pavement structure will be greatly reduced. The treatment of reflective cracks in the "joints of old cement concrete slabs in white-on-black projects" is a technical problem in highway engineering.

[0003] The current technologies and measures to mitigate or prevent reflective cracks in projects mainly include: increasing the thickness of the asphalt overlay; adding fibers and rubber to improve the performance of the asphalt surface layer; adding a large-size asphalt gravel structure layer; adding a semi-rigid base layer and combining it with a steel mesh; laying a stress absorption layer (special type of asphalt mixture) throughout the layer; adding polyester glass fiber cloth or geotextile interlayer, glass fiber grid, waterproof membrane, etc. However, the anti-reflection effect of the existing technologies for preventing reflective cracks is not ideal. For example: ① Adding a semi-rigid base layer and matching it with a steel mesh can basically solve the problem, but it increases the cost very much, and the solution is usually greatly limited due to the limited elevation and the inability to add a too thick structural layer; ② Increasing the thickness of the asphalt overlay, adding fibers and rubber to improve the performance of the asphalt surface layer, adding a large-size asphalt crushed stone structure layer, etc., increase the cost very much but cannot completely solve the problem, and can only appropriately alleviate and delay the occurrence and development of cracks; ③ Laying a stress absorption layer (special type of asphalt mixture) in the whole layer usually requires the treatment of cracks in the old road surface. This solution is expensive and destroys the integrity and overall strength of the old road surface, but the actual application effect is general due to the lack of pertinence; ④ Adding polyester glass fiber cloth or geotextile interlayer, glass fiber grid, waterproof roll and other solutions, because they are soft materials, cannot provide shear strength or even good tensile strength, so they basically do not solve the shear resistance problem. Moreover, geotextiles are difficult to lay flat in windy weather or during the operation of material transportation and paving units, and the engineering construction is also very difficult.

[0004] Generally speaking, there is basically no way to slow down or prevent reflective cracks at present. How to effectively or completely solve this problem has become a technical problem in engineering. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a rigid-elastic composite plate and a preparation method thereof, as well as a method for preventing and controlling reflective cracks.

[0006] The invention relates to the prevention and treatment of pavement cracks in a road pavement upgrading and reconstruction (cement or asphalt concrete pavement overlay or asphalt concrete pavement renovation) project.

[0007] The present invention is based on the principle of "rigid-elastic composite system" and adopts a composite method of a hard, shear-resistant, high-strength, crack-proof metal mesh and a solid elastic carrier to provide a rigid-elastic composite plate and a preparation method thereof, as well as a method for preventing and controlling reflective cracks. The composite plate is laid at the cracks before the asphalt mixture overlay is added to the old cement concrete road surface, which can effectively prevent and control upward reflective cracks at the existing crack positions of the old road surface after the asphalt mixture overlay is added.

[0008] The innovation of the present invention lies in: ① The present invention perfectly combines rigidity and elasticity, and can not only use the metal mesh to achieve the purpose of hardness, high strength and shear resistance, but also use the elastic carrier to absorb and disperse the stress from the upper vehicle load and the response of the lower structural layer; ② The composite board of the present invention can be prefabricated in batches in the factory to improve the on-site construction efficiency; ③ The composite board of the present invention can be laid flat on the old cement concrete road surface without affecting the construction vehicles or equipment to add the asphalt mixture overlay layer; ④ The composite board can be laid in layers, and only the crack position can be treated in a targeted manner; ⑤ The bottom surface of the composite board and the old road surface can be combined with a conventional asphalt adhesive layer or a special adhesive according to the elastic carrier material, and the top surface can be fused with the upper asphalt concrete during the high-temperature paving, so that the top and bottom surfaces of the composite board form a good interlayer bond; ⑥ The cost of the composite board is within a reasonable range; ⑦ The present invention can fundamentally and effectively or completely solve the engineering technical problem that "corresponding to the joint (or crack) position of the old cement concrete road surface, generally more reflective cracks will be quickly formed in the added asphalt road surface".

[0009] The technical scheme of the present invention includes: ① Based on the principle of "rigid-elastic composite system", a rigid-elastic composite plate composed of a hard, shear-resistant, high-strength, and crack-resistant metal mesh and an elastic carrier is provided; ② A preparation method of the rigid-elastic composite plate is provided; ③ A method for preventing and controlling reflective cracks (i.e., a method for preventing and controlling reflective cracks from occurring and developing upward) is provided.

[0010] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0011] The utility model relates to a rigid-elastic composite plate, which is formed by hot-melting a solid elastic carrier and a high-strength metal mesh arranged therein.

[0012] The high-strength metal mesh is a welded grid structure.

[0013] The raw material of the solid elastic carrier is rubber, plastic, asphalt, silicon material, resin material or composite material.

[0014] The width of the rigid-elastic composite plate is 70~100cm and the average thickness is 3.5mm±1mm.

[0015] The rigid-elastic composite plate has a flat plate shape, a grid shape or a groove shape.

[0016] A method for preparing a rigid-elastic composite plate comprises the following steps: placing a high-strength metal mesh and a solid elastic carrier raw material in a hot-melt mold, heating and pressurizing the solid elastic carrier raw material to melt the solid elastic carrier raw material, and flowing and wrapping the high-strength metal mesh in the mold, releasing the external pressure to zero, and cooling to room temperature to form a rigid-elastic composite plate, and finally taking out the rigid-elastic composite plate from the mold.

[0017] The raw material of the solid elastic carrier is rubber, plastic, asphalt, silicon material, resin material or composite material.

[0018] High-strength metal mesh is made of high-strength metal wire or alloy wire welded at nodes.

[0019] A method for preventing and controlling reflective cracks in joints or cracks on the top surface of an old road surface by using a rigid-elastic composite plate. The method comprises: firstly spreading a tack coat of asphalt or an engineering adhesive on the joints or cracks on the top surface of an old cement concrete road surface or an old asphalt road surface, and then directly laying an asphalt mixture overlay after laying the rigid-elastic composite plate on the joints or cracks on the top surface of the old cement concrete road surface or the old asphalt road surface.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) Prepare a rigid-elastic composite plate (solid elastic carrier and high-strength metal mesh hot-melt composite) with hard, shear-resistant, high-strength and crack-resistant properties, which can effectively slow down the generation and development of upward reflective cracks at the existing crack positions of the old road surface after the asphalt mixture overlay is added, and reduce the construction difficulty, improve the overall construction efficiency and save construction time, reduce the cost of later maintenance, and extend the service life of the road;

[0022] (2) It strengthens the overall pavement structure after the asphalt mixture overlay is added, improving its overall mechanical state;

[0023] (3) The composite board made of a hard, high-strength, anti-crack metal mesh and a solid elastic carrier by hot melting has good water sealing (waterproof infiltration) ability and has a good protective effect on the structure below the old road surface to prevent water damage and freeze-thaw damage;

[0024] (4) The use of high-strength shear-resistant anti-crack metal mesh and solid elastic carrier composite plates to prevent and control reflective cracks is suitable for all roads, airports, sites and other asphalt concrete pavement projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional view of the rigid-elastic composite plate of the present invention;

[0026] Figure 2 is a top view of the high-strength metal mesh of the present invention;

[0027] Figure 3 is a top view of the flat plate-shaped rigid-elastic composite plate of the present invention;

[0028] Figure 4 yes Figure 3 The main view of

[0029] Figure 5 is a top view of the groove-shaped rigid-elastic composite plate of the present invention;

[0030] Figure 6 yes Figure 5 The cross-sectional view of the AA section;

[0031] Figure 7 It is a cross-sectional view of the rigid-elastic composite plate of the present invention used in an old road surface paving project;

[0032] Figure 8 is an outline diagram of the groove-shaped rigid-elastic composite plate of the present invention;

[0033] Fig. 9 is an outline diagram of a flat plate-shaped rigid-elastic composite plate of the present invention;

[0034] Fig.10 It is a construction site picture of laying the rigid elastic composite plate of the present invention at a wider road joint before laying an asphalt mixture overlay;

[0035] Fig.11 The present invention is a construction site diagram showing that the rigid-elastic composite plate of the present invention is laid on the longitudinal cracks of the plate before laying an asphalt mixture overlay.

[0036] The names and reference numerals of the components involved in the above drawings are summarized as follows:

[0037] Solid elastic carrier 1, high-strength metal mesh 2, old cement concrete pavement or old asphalt pavement 3, adhesive layer asphalt or engineering adhesive 4, rigid-elastic composite board 5, asphalt mixture overlay 6. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] Specific implementation method 1: Figure 1-Figure 6 , Figure 8 and Fig. 9 As shown, this embodiment describes a rigid-elastic composite plate, which is formed by hot-melt bonding of a solid elastic carrier 1 and a high-strength metal mesh 2 disposed therein.

[0040] Furthermore, the high-strength metal mesh 2 is a welded grid structure.

[0041] High-strength metal mesh 2 includes all feasible metal materials or alloy materials such as high-strength steel, and is a grid-type metal mesh formed by welding high-strength metal wires through nodes. High-strength metal mesh 2 has the same properties and dimensions in the horizontal and vertical directions. High-strength metal mesh 2 should have sufficient mechanical technical indicators such as tensile strength, fatigue strength, rigidity or elastic modulus (see Table 1 for typical parameter requirements), and should also ensure sufficient weld shear strength and total shear force (weld area and volume). It can also be determined whether to use rust-resistant or other corrosion-resistant treatments according to specific working conditions.

[0042] Furthermore, the raw material of the solid elastic carrier 1 is rubber, plastic, asphalt, silicon material, resin material or composite material (it can also be all feasible types of materials that meet the typical parameters in Table 1).

[0043] The solid elastic carrier 1 material should have appropriate mechanical technical indicators such as strength, stiffness or elastic modulus (see Table 1 for typical parameter requirements), and should also have good bonding or interlayer friction with asphalt or cement materials, high temperature resistance for asphalt concrete paving, heat resistance under high temperature conditions, low temperature resistance, frost resistance and freeze-thaw resistance (no instant damage and no obvious decrease in technical indicators after repeated freeze-thaw), fatigue resistance under repeated loads, and anti-aging ability under natural water temperature conditions (good durability). In addition, after hot melting to form a rigid-elastic composite board 5, it should also have the ability to prevent the metal mesh from rusting - the whole is impermeable, and the solid elastic carrier 1 wraps and protects the metal mesh.

[0044] Furthermore, the rigid-elastic composite plate 5 has a width of 70-100 cm and an average thickness of 3.5 mm ± 1 mm.

[0045] Furthermore, the rigid-elastic composite plate 5 has an outer shape of a flat plate, a grid or a groove.

[0046] The advantages of the flat composite board are: the mold and other related production processes are simple and the product is stable; the disadvantages are: the solid elastic carrier 1 is used in large quantities and the cost is high;

[0047] The advantages of the grid-shaped composite plate are: the use of the solid elastic carrier 1 is minimal and the cost is the lowest; the disadvantages are: the mold and other related manufacturing processes are slightly complicated;

[0048] The advantages of the grooved composite board are: less elastic carrier is used and the cost is low; the disadvantages are: the mold and other related production processes are slightly complicated.

[0049] The stress state of grid-shaped and groove-shaped composite panels will be better. The reason is that the asphalt mixture added on top can enter the groove or grid grid, directly contact and constrain the metal mesh at the same level, so that the performance and function of the metal mesh in all directions can be fully exerted.

[0050] The rigid-elastic composite plate 5 is made of a solid elastic carrier 1 and a high-strength metal mesh 2 through physical heat melting. The solid elastic carrier 1 can absorb and disperse stress; the high-strength metal mesh 2 has the properties of hardness, shear resistance, high strength, and crack resistance. The high-strength metal mesh 2 inside the solid elastic carrier 1 is a welded grid type, which can effectively resist the shear stress generated in the cracks of the old road surface under the action of vehicle load, and sealing in the solid elastic carrier 1 can significantly delay the corrosion of the high-strength metal mesh 2. The rigid-elastic composite plate 5 has a width of 70~100cm and an average thickness of 3.5mm±1mm, and can withstand high temperatures of about 160℃ for a short time. The rigid-elastic composite plate 5 can be made into a flat plate, a grid or a groove.

[0051] Specific implementation method 2: Figure 1-Figure 6 , Figure 8 and Fig. 9 As shown, this embodiment records a method for preparing a rigid-elastic composite plate, the method being: after placing a high-strength metal mesh 2 and a solid elastic carrier 1 raw material in a hot-melt mold, the solid elastic carrier 1 raw material is heated and pressurized (belonging to a conventional process) to melt the solid elastic carrier 1 raw material, and after flowing and wrapping the high-strength metal mesh 2 in the mold, the external pressure is released to zero, and the temperature is lowered to room temperature to form a rigid-elastic composite plate 5, and finally the rigid-elastic composite plate 5 is taken out of the mold.

[0052] Furthermore, the raw material of the solid elastic carrier 1 is rubber (such as raw rubber sheet, the heating and pressurizing process is also the process of vulcanizing it into a rubber product), plastic, asphalt, siliceous material, resin material or composite material (other feasible types of materials can also be selected).

[0053] The raw materials of the solid elastic carrier 1 should have suitable mechanical technical indicators such as strength, stiffness or elastic modulus (see Table 1 for typical parameter requirements), and should also have good bonding or interlayer friction with asphalt or cement materials, high temperature resistance for asphalt mixture paving, heat resistance under high temperature conditions, low temperature resistance, frost resistance and freeze-thaw resistance (no instantaneous damage and no obvious decrease in technical indicators after repeated freeze-thaw), fatigue resistance under repeated loads, and anti-aging ability under natural water temperature conditions (good durability). In addition, after hot melting to form a rigid-elastic composite plate 5, it should also have the ability to prevent the metal mesh from rusting, that is, the whole is impermeable, and the solid elastic carrier 1 has a good wrapping and protection ability for the high-strength metal mesh 2).

[0054] Furthermore, the high-strength metal mesh 2 is made of high-strength metal wire or alloy wire welded at nodes (the high-strength metal mesh 2 has the same properties and dimensions in the transverse and longitudinal directions. The high-strength metal mesh 2 should have sufficient mechanical technical indicators such as tensile strength, fatigue strength, rigidity or elastic modulus (see Table 1 for typical parameter requirements), and should also ensure sufficient weld shear strength and total shear force (weld area and volume). It can also be decided whether to use rust-resistant or other corrosion-resistant treatments according to specific working conditions).

[0055] Specific implementation method three: Figure 7 , Fig.10 and Fig.11 As shown, this embodiment records a method for preventing and controlling reflective cracks in the joints or cracks on the top surface of an old road surface using the rigid-elastic composite plate described in any one of the specific embodiments one to five. The method is: first, spread a tack coat of asphalt or an engineering adhesive 4 on the joints or cracks on the top surface of an old cement concrete road surface or an old asphalt road surface 3, then lay a rigid-elastic composite plate 5 on the joints or cracks on the top surface of an old cement concrete road surface or an old asphalt road surface 3, and then directly lay an asphalt mixture overlay 6.

[0056] This method is aimed at the asphalt mixture overlay 6 project for cement pavements that are generally stable, flat, have good concrete strength, only joints or cracks, and have few broken boards. When spreading tack coat asphalt or common engineering adhesives, a rigid elastic composite plate 5 with hard, shear-resistant, high-strength, and crack-resistant properties is laid on the joints or cracks on the top surface of the old cement concrete pavement or the old asphalt pavement 3, and then the asphalt mixture overlay 6 is directly laid (that is, the composite plate is laid on the cracks before the asphalt mixture overlay 6 is laid on the old pavement). This method is also suitable for asphalt pavements that are generally stable, flat, have good strength, and have only a small number of longitudinal or transverse cracks, and for direct laying or milling and re-laying of asphalt mixture overlay 6. This method can effectively prevent and control upward reflection cracks at the existing crack positions of the old pavement after laying the asphalt mixture overlay 6. Example 1

[0057] A method for preparing a rigid-elastic composite plate, wherein the high-strength metal mesh 2 is a node-welded high-strength steel wire mesh grid, the diameter of the high-strength steel wire is 2-3 mm, the mesh size length×width is 5-10 cm, and the tensile strength of the steel wire is 1000-1600 MPa.

[0058] The solid elastic carrier 1 uses economically reasonable rubber with technical indicators that meet the requirements. The raw material is raw rubber sheet. The physical heat melting process with the high-strength metal mesh 2, that is, the heating and pressurizing process, is also the process of vulcanization into a rubber product (a molding process).

[0059] To prepare a flat rigid-elastic composite board 5, a common hot-melt mold (simple flat type) can be used in the preparation process. If a grid-shaped or groove-shaped rigid-elastic composite board 5 is prepared, a hot-melt mold of a special shape needs to be prepared.

[0060] After placing the raw rubber sheet - high-strength metal mesh 2 - raw rubber sheet in the mold in sequence, the raw rubber sheet is melted in a hot melt mold (a hot melt vulcanization mold is selected) under high temperature and pressure (for the molding process), and flows orderly and moderately in the mold and wraps the high-strength steel wire mesh to complete the vulcanization process. After releasing the external pressure to zero and cooling to room temperature, the rigid-elastic composite plate 5 is made.

[0061] The present invention can manufacture composite plates with different mechanical indexes according to the diameter of the high-strength metal mesh wire, mesh spacing, wire strength or modulus, etc.; the composite plate can be made into a flat plate shape, or into a grid shape, a groove shape, or other appearance shapes.

[0062] Working principle: Compared with stress absorption layers and other soft paving fabrics that are commonly used to deal with the problem of reflective cracks, the present invention adopts a rigid-elastic composite plate 5 with hardness, shear resistance, high strength, and crack resistance (the high-strength metal mesh 2 and the solid elastic carrier 1 are hot-melt composited, the high-strength metal mesh 2 is a high-strength hard welded metal mesh, and the solid elastic carrier 1 has a certain strength). It is based on the principle of "rigid-elastic composite system" and therefore has better stress absorption and dispersion capabilities, shear resistance, and tensile strength. When vehicle load acts on the asphalt mixture overlay layer 6 added at the cracks of the old cement concrete pavement or the old asphalt pavement 3, the rigid-elastic composite plate 5 can effectively absorb and disperse the responsive bidirectional stress from the upper vehicle load and the lower top surface of the old pavement, and effectively resist shear stress and tensile stress (the solid elastic carrier 1 can absorb and disperse stress; the high-strength metal mesh 2 arranged in the middle is a welded grid type, which can effectively resist the shear stress generated at the cracks of the old pavement under the action of vehicle load), thereby avoiding the deformation of the asphalt mixture overlay layer 6 added at the joints of the old pavement and generating reflective cracks, effectively eliminating the stress concentration phenomenon of the asphalt mixture overlay layer 6 at the joints, and inhibiting the occurrence and expansion of reflective cracks.

[0063] (1) Using the strength of high-strength and rigid welded metal mesh, the huge shear force caused by uneven deformation of the old road surface under vehicle load can be resisted at joints or cracks with weak or no load-transfer capacity;

[0064] (2) Using the strength of the solid elastic carrier 1, the composite plate as a whole or the high-strength metal mesh 2 to resist the tensile force generated by volume change or lateral displacement caused by changes in temperature and other conditions;

[0065] (3) Using the solid elastic carrier 1 and the reasonable elastic-rigidity matching of the composite plate as a whole, the vehicle load pressure and the response stress of the top surface of the old road surface can be effectively buffered and diffused;

[0066] (4) It strengthens the overall pavement structure after the asphalt mixture overlay layer 6 is laid and improves its overall mechanical state.

[0067] The present invention is mainly applicable to cement concrete pavement overlay asphalt mixture (asphalt concrete) overlay engineering, asphalt pavement maintenance engineering, and asphalt pavement re-maintenance engineering after cement road overlay, and is mainly aimed at cracks and joints in old pavement (single and / or obvious cracks, joints with no or low load transfer capacity).

[0068] The technical parameters of the rigid elastic composite plate 5 (a rigid metal mesh composite plate with high shear resistance and crack resistance) are shown in Table 1;

[0069] Table 1

[0070]

[0071] The specific applicable conditions and specific technical solutions (application methods) of the rigid-elastic composite plate 5 of the present invention are shown in Table 2;

[0072] Table 2

[0073]

[0074] The key parameters of the composite board of the present invention and other materials are compared in Table 3;

[0075] Table 3

[0076]

[0077] The technical solution of the present invention is compared with the commonly used engineering solution and the cost is shown in Table 4

[0078] Table 4

[0079]

[0080] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0081] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A rigid-elastic composite plate for preventing and controlling reflective cracks in joints or cracks on the top surface of an old road surface, characterized in that: It is formed by hot-melting a solid elastic carrier (1) and a high-strength metal mesh (2) arranged therein; the high-strength metal mesh (2) is a welded grid structure; the raw material of the solid elastic carrier (1) is rubber, plastic, asphalt, siliceous material, resin material or composite material; the width of the rigid-elastic composite plate (5) is 70 to 100 cm, and the average thickness is 3.5 mm ± 1 mm; the shape of the rigid-elastic composite plate (5) is a groove shape.

2. A method for preparing a rigid-elastic composite plate for preventing and controlling reflective cracks in joints or cracks on the top surface of an old road surface as claimed in claim 1, characterized in that: The method comprises the following steps: placing a high-strength metal mesh (2) and a raw material of a solid elastic carrier (1) in a hot-melt mold, heating and pressurizing the raw material of the solid elastic carrier (1) to melt the raw material of the solid elastic carrier (1), and allowing the raw material to flow and wrap around the high-strength metal mesh (2) in the mold, releasing the external pressure to zero, and cooling the material to room temperature to form a rigid-elastic composite plate (5), and finally taking the rigid-elastic composite plate (5) out of the mold.

3. The method for preparing a rigid-elastic composite plate for preventing and controlling reflective cracks in joints or cracks on the top surface of an old road surface according to claim 2, characterized in that: The raw materials of the solid elastic carrier (1) are rubber, plastic, asphalt, siliceous material and resin material.

4. The method for preparing a rigid-elastic composite plate for preventing and controlling reflective cracks in joints or cracks on the top surface of an old road surface according to claim 2, characterized in that: The high-strength metal mesh (2) is made of high-strength metal wires or alloy wires welded at nodes.

5. A construction method for preventing and controlling reflective cracks in joints or cracks on the top surface of an old road surface by using the rigid-elastic composite plate according to claim 1, characterized in that: The method comprises the following steps: firstly spreading a tack coat of asphalt or an engineering adhesive (4) on the joints or cracks on the top surface of an old cement concrete pavement or an old asphalt pavement (3); then laying a rigid elastic composite plate (5) on the joints or cracks on the top surface of the old cement concrete pavement or the old asphalt pavement (3); and then directly laying an asphalt mixture overlay (6).

Images