Road board preparation method based on ultra-high performance concrete

Abstract

The invention relates to the technical field of ultra-high performance concrete, and discloses an ultra-high performance concrete-based road plate preparation method, which comprises the following arrangement steps: 1) pre-paving a waterproof film on the ground; (2) a steel formwork is built on the waterproof thin film and surrounds the waterproof thin film in an annular closed mode; (3) a plurality of reinforcing mesh layers are built in the mold cavity and are sequentially arranged at intervals; (4) ultra-high performance concrete is poured into the mold cavity and wraps the multiple reinforcing mesh layers; (5) the top end face is subjected to trowelling treatment to be in a flat shape; (6) the top end face is covered with a curing film layer, and heat preservation and moisture preservation curing is conducted on the ultra-high-performance concrete till the ultra-high-performance concrete is solidified to form a road plate; (7) the steel formwork is detached to be separated from the road plate; by means of reasonable arrangement of ultra-high performance concrete and multiple layers of reinforcing meshes, heat preservation, moisture preservation, maintenance and the like, the strength, durability and crack resistance of the road plate are remarkably improved, and the high-standard requirement of modern traffic on the road plate can be effectively met.

Description

Technical Field

[0001] The patent of this invention relates to the technical field of ultra-high performance concrete, specifically, to a method for preparing road slabs based on ultra-high performance concrete. Background Art

[0002] In road construction, road slabs are important load-bearing structures, and their performance directly affects the service life and driving safety of the road. Traditional road slab preparation methods mainly use ordinary reinforced concrete and are produced through on-site casting or prefabrication.

[0003] In the existing technology, ordinary reinforced concrete road slabs are heavy and large in size, which not only increases the cost of transportation and lifting, but also easily causes early cracks to form due to bending and pulling during the lifting process. If the road slab size is too small, the number of pavement joints will increase, reducing the integrity of the road surface and increasing the risk of later damage.

[0004] In addition, ordinary concrete has poor durability and is easily affected by environmental factors such as freeze-thaw cycles, chemical erosion, and carbonization, which not only shortens the service life of road slabs but also increases road maintenance costs;

[0005] In addition, ordinary reinforced concrete has limited crack resistance, and its compressive strength and flexural tensile strength are also low, which makes it difficult to meet the high-strength requirements of modern traffic for road slabs. Especially under heavy traffic and harsh environmental conditions, road slabs are prone to cracks and damage. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for preparing a road slab based on ultra-high performance concrete, aiming to solve the problem of insufficient performance of ordinary road slabs in the prior art.

[0007] The present invention is achieved by a method for preparing a road slab based on ultra-high performance concrete, comprising the following steps:

[0008] 1) Pre-lay waterproof film on the ground;

[0009] 2) Building a steel template on the waterproof film, the steel template is annularly closed and enclosed to form a mold cavity, the top of the mold cavity has a top opening, the bottom of the mold cavity has a bottom opening, and the waterproof film seals the bottom opening;

[0010] 3) Building a plurality of steel mesh layers in the mold cavity, wherein the plurality of steel mesh layers are sequentially spaced along the height of the mold cavity;

[0011] 4) pouring ultra-high performance concrete into the mold cavity, wherein the ultra-high performance concrete completely fills the mold cavity and wraps the plurality of steel mesh layers, and the ultra-high performance concrete has a top end surface filled in the top opening;

[0012] 5) Smoothing the top end surface to make it flat;

[0013] 6) Covering the top end surface with a curing film layer and performing thermal insulation and moisture maintenance on the ultra-high performance concrete until the ultra-high performance concrete solidifies to form a road slab;

[0014] 7) Remove the steel formwork to separate the steel formwork from the road slab.

[0015] Furthermore, in the preparation step 1), after the waterproof film is pre-laid on the ground, water mist is sprayed on the waterproof film to keep the waterproof film in a wet state.

[0016] Furthermore, in the preparation step 2), the steel template is formed by welding.

[0017] Furthermore, in the preparation step 2), the steel template has a plurality of weld seams, and the weld seams are ground, polished or anti-corrosion treated.

[0018] Furthermore, in the preparation step 3), the inner side wall of the steel formwork has an inner side wall facing the mold cavity, and the outer periphery of the steel mesh layer is docked on the inner side wall; in the preparation step 7), when the road slab is separated from the steel formwork, the outer periphery of the steel mesh layer is exposed on the outer periphery of the road slab.

[0019] Furthermore, in the preparation step 3), the plurality of steel mesh layers are arranged in a horizontally flat manner, and the plurality of steel mesh layers are provided with a plurality of longitudinal ribs arranged longitudinally, and the plurality of longitudinal ribs are arranged at intervals along the flattening direction of the steel mesh layers; the longitudinal ribs pass through the plurality of steel mesh layers and are fixedly connected to the plurality of steel mesh layers as a whole;

[0020] The lower portion of the longitudinal rib comprises a lower section located below the plurality of steel mesh layers, the lower section being flush with the bottom opening and abutting against the waterproof membrane, and the upper portion of the longitudinal rib comprises an upper section located above the plurality of steel mesh layers, the upper section being flush with the top opening;

[0021] In the preparation step 4), when the mold cavity is filled with ultra-high performance concrete, the bottom of the lower section is exposed at the bottom of the ultra-high performance concrete, and the top of the upper section is exposed at the top end surface of the ultra-high performance concrete.

[0022] Furthermore, in the preparation arrangement 3), a plurality of upper oblique bars are provided on the periphery of the lower section, the plurality of upper oblique bars are arranged around the periphery of the lower section at intervals, and extend from bottom to top into the mold cavity; a plurality of lower oblique bars are provided on the periphery of the upper section, the plurality of lower oblique bars are arranged around the periphery of the upper section at intervals, and extend from top to bottom into the mold cavity;

[0023] In the preparation step 4), after the mold cavity is filled with ultra-high performance concrete, the plurality of upper inclined strips and the plurality of lower inclined strips are wrapped in the ultra-high performance concrete.

[0024] Furthermore, in the preparation step 4), a central casting head and multiple peripheral casting heads are arranged above the mold cavity, the central casting head is aligned with the center of the mold cavity in an upper and lower manner, and the multiple peripheral casting heads are arranged around the periphery of the central casting head at intervals; ultra-high performance concrete is synchronously poured into the mold cavity through the central casting head and the multiple peripheral casting heads, and the pouring flow rate of the central casting head is greater than the pouring flow rate of the peripheral casting heads.

[0025] Furthermore, in the preparation step 4), a central vibrating rod is inserted into the mold cavity along the downward pouring direction of the central pouring head, and the central vibrating rod has an insertion section inserted into the mold cavity; a plurality of movable bars are connected to the periphery of the insertion section, and the plurality of movable bars are arranged around the periphery of the insertion section at intervals, the inner ends of the movable bars are movably connected to the insertion section, the outer ends of the movable bars are freely extended outward, and the outer ends of the movable bars are aligned with the peripheral pouring head in an upper and lower manner;

[0026] In the preparation step 4), during the process of pouring the ultra-high performance concrete into the mold cavity by the central pouring head and the plurality of peripheral pouring heads, the central vibrating rod synchronously vibrates longitudinally and drives the plurality of movable bars to swing and vibrate.

[0027] Furthermore, in the preparation step 4), the movable strip is arranged in a multi-section curved shape along the extension direction of the movable strip from the inside to the outside, and during the longitudinal vibration of the central vibrating rod, the movable strip swings and vibrates in a wave-like manner.

[0028] Compared with the prior art, the method for preparing a road slab based on ultra-high performance concrete provided by the present invention achieves improved performance of the road slab through the following advantages:

[0029] 1) Pre-laying a waterproof membrane effectively isolates ground moisture, ensuring a dry environment for concrete pouring, improving concrete density and strength, and reducing cracks caused by moisture evaporation. The ring-shaped closed design of the steel formwork provides precise forming accuracy and structural stability, reducing formwork deformation, and thus improving the quality of the road slab;

[0030] 2) By sequentially spacing and rationally arranging multiple layers of steel mesh in the mold cavity, the force can be evenly distributed, which not only enhances the structural strength and crack resistance of the road slab, but also improves the flexural and tensile strength, thereby better adapting to traffic loads;

[0031] 3) Relying on the high strength, high durability and low permeability of ultra-high performance concrete, the load-bearing capacity and service life of the road slab are improved. At the same time, the concrete fills the mold cavity and wraps the steel mesh layer, ensuring a close bond between the steel and concrete, further enhancing the structural stability of the road slab and thus improving the overall performance of the road slab;

[0032] 4) By covering the curing membrane layer, the humidity and temperature of the concrete surface are maintained, which promotes the uniform solidification of the concrete, avoids the cracks caused by dryness and temperature difference, and further improves the durability and crack resistance of the road slab. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the process for preparing a road slab based on ultra-high performance concrete provided by the present invention;

[0034] Figure 2 1 is a schematic cross-sectional view of the steel mesh layer provided by the present invention;

[0035] Figure 3 is a schematic cross-sectional view of the membrane cavity provided by the present invention;

[0036] In the figure: steel formwork 100, steel mesh layer 101, longitudinal ribs 102, lower section 103, upper section 104, lower oblique strips 105, upper oblique strips 106;

[0037] Mould cavity 200 , central pouring head 201 , peripheral pouring head 202 , central vibrating rod 203 , insertion section 204 , movable bar 205 . DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] The implementation of the present invention is described in detail below with reference to specific embodiments.

[0040] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0041] Reference Figure 1-3 The figure shows a preferred embodiment of the present invention.

[0042] The method for preparing a road slab based on ultra-high performance concrete includes the following steps:

[0043] 1) Pre-lay waterproof film on the ground;

[0044] 2) Build a steel template 100 on the waterproof film. The steel template 100 is annularly closed to form a mold cavity 200. The top of the mold cavity 200 has a top opening, and the bottom of the mold cavity 200 has a bottom opening. The waterproof film seals the bottom opening.

[0045] 3) Building a plurality of steel mesh layers 101 in the mold cavity 200, wherein the plurality of steel mesh layers 101 are sequentially spaced along the height of the mold cavity 200;

[0046] 4) pouring ultra-high performance concrete into the mold cavity 200, the ultra-high performance concrete filling the mold cavity 200 and wrapping the multiple steel mesh layers 101, the ultra-high performance concrete having a top end surface filled in the top opening;

[0047] 5) Smooth the top end surface to make it flat;

[0048] 6) Cover the top end surface with a curing film layer and perform thermal insulation and moisture maintenance on the ultra-high performance concrete until the ultra-high performance concrete solidifies to form a road slab;

[0049] 7) Remove the steel template 100 to separate the steel template 100 from the road slab.

[0050] The above-mentioned method for preparing a road slab based on ultra-high performance concrete achieves improved performance of the road slab through the following advantages:

[0051] 1) Pre-paving a waterproof membrane effectively isolates ground moisture, ensuring a dry environment for concrete pouring, improving concrete density and strength, and reducing cracks caused by moisture evaporation. The ring-shaped closed design of the steel formwork 100 provides precise forming accuracy and structural stability, reducing formwork deformation, thereby improving the quality of the road slab.

[0052] 2) By sequentially spacing and rationally arranging multiple layers of steel mesh in the mold cavity 200, the force can be evenly distributed, which not only enhances the structural strength and crack resistance of the road slab, but also improves the flexural and tensile strength, thereby better adapting to traffic loads;

[0053] 3) Relying on the high strength, high durability and low permeability characteristics of ultra-high performance concrete, the load-bearing capacity and service life of the road slab are improved. At the same time, the concrete fills the mold cavity 200 and wraps the steel mesh layer 101, ensuring a close bond between the steel bars and the concrete, further enhancing the structural stability of the road slab and thus improving the overall performance of the road slab;

[0054] 4) By covering the curing membrane layer, the humidity and temperature of the concrete surface are maintained, which promotes the uniform solidification of the concrete, avoids the cracks caused by dryness and temperature difference, and further improves the durability and crack resistance of the road slab.

[0055] In this embodiment, in preparation step 1), after the waterproof film is pre-laid on the ground, water mist is sprayed on the waterproof film to keep the waterproof film in a moist state; this can enhance the tightness between the waterproof film and the ground, improve the waterproof effect, ensure a dry environment at the bottom of the mold cavity 200 during concrete pouring, thereby improving the density and strength of the concrete, and laying the foundation for high-quality molding of the road slab.

[0056] In this embodiment, in preparation step 2), the steel formwork 100 is formed by welding; the welded steel formwork 100 has higher structural strength and stability, can better withstand the lateral pressure during concrete pouring, ensure the shape and dimensional accuracy of the mold cavity 200, and thus improve the forming quality of the road slab.

[0057] In this embodiment, in preparation step 2), the steel formwork 100 has multiple welds, and the welds are ground, polished or anti-corrosion treated; in this way, the stress concentration at the welds can be effectively reduced, the overall service life and reliability of the steel formwork 100 can be improved, and at the same time, rust at the welds can be prevented from contaminating the concrete.

[0058] In this embodiment, in preparation step 3), the inner side wall of the steel formwork 100 has an inner side wall facing the mold cavity 200, and the outer periphery of the steel mesh layer 101 is docked on the inner side wall; in preparation step 7), when the road slab is separated from the steel formwork 100, the outer periphery of the steel mesh layer 101 is exposed on the outer periphery of the road slab.

[0059] In this way, the steel mesh layer 101 can fit tightly with the steel formwork 100 during the concrete pouring process, ensuring the accurate positioning of the steel mesh layer 101 and the uniform wrapping of the concrete, thereby improving the structural strength and integrity of the road slab.

[0060] In this embodiment, in the preparation step 3), the plurality of steel mesh layers 101 are arranged in a horizontally flat manner, and the plurality of steel mesh layers 101 are provided with a plurality of longitudinal ribs 102 arranged longitudinally, and the plurality of longitudinal ribs 102 are arranged at intervals along the flattening direction of the steel mesh layers 101; the longitudinal ribs 102 pass through the plurality of steel mesh layers 101 and are fixedly connected to the plurality of steel mesh layers 101 as a whole;

[0061] The lower portion of the longitudinal rib 102 includes a lower section 103 located below the multiple steel mesh layers 101. The lower section 103 is flush with the bottom opening and abuts against the waterproof membrane. The upper portion of the longitudinal rib 102 includes an upper section 104 located above the multiple steel mesh layers 101. The upper section 104 is flush with the top opening.

[0062] In preparation step 4), when the mold cavity 200 is filled with ultra-high performance concrete, the bottom of the lower section 103 is exposed at the bottom of the ultra-high performance concrete, and the top of the upper section 104 is exposed at the top end surface of the ultra-high performance concrete.

[0063] The combined arrangement of the steel mesh layer 101 and the longitudinal ribs 102 can further enhance the flexural tensile strength and crack resistance of the road slab, enabling it to better withstand the influence of traffic loads and environmental factors, and effectively solving the problem of insufficient crack resistance of ordinary road slabs.

[0064] In this embodiment, in the preparation arrangement 3), a plurality of upper oblique bars 106 are provided on the periphery of the lower section 103. The plurality of upper oblique bars 106 are arranged around the periphery of the lower section 103 at intervals and extend from bottom to top into the mold cavity 200. A plurality of lower oblique bars 105 are provided on the periphery of the upper section 104. The plurality of lower oblique bars 105 are arranged around the periphery of the upper section 104 at intervals and extend from top to bottom into the mold cavity 200.

[0065] In the preparation step 4), after the mold cavity 200 is filled with ultra-high performance concrete, the plurality of upper inclined strips 106 and the plurality of lower inclined strips 105 are wrapped in the ultra-high performance concrete.

[0066] The setting of the oblique strips can play a certain supporting and guiding role in the concrete pouring process, further improving the pouring quality of the concrete. At the same time, after the oblique strips are wrapped in the concrete, they can form a whole with the concrete, enhancing the structural strength and stability of the road slab.

[0067] In this embodiment, in the preparation step 4), a central casting head 201 and a plurality of peripheral casting heads 202 are arranged above the mold cavity 200, the central casting head 201 is aligned with the center of the mold cavity 200 in an upper and lower direction, and the plurality of peripheral casting heads 202 are arranged around the periphery of the central casting head 201 at intervals; ultra-high performance concrete is simultaneously poured into the mold cavity 200 through the central casting head 201 and the plurality of peripheral casting heads 202, and the pouring flow rate of the central casting head 201 is greater than the pouring flow rate of the peripheral casting heads 202.

[0068] The use of a multi-point synchronous pouring method can ensure uniform distribution of concrete in the mold cavity 200, reduce bubbles and voids during the concrete pouring process, increase the density and strength of the concrete, and thus improve the overall performance of the road slab.

[0069] In this embodiment, in preparation step 4), a central vibrating rod 203 is inserted into the mold cavity 200 along the downward pouring direction of the central pouring head 201. The central vibrating rod 203 has an insertion section 204 inserted into the mold cavity 200. A plurality of movable bars 205 are connected to the periphery of the insertion section 204. The plurality of movable bars 205 are arranged around the periphery of the insertion section 204 at intervals. The inner ends of the movable bars 205 are movably connected to the insertion section 204, and the outer ends of the movable bars 205 are freely extended outward. The outer ends of the movable bars 205 are aligned vertically with the peripheral pouring head 202.

[0070] In preparation step 4), during the process of the central pouring head 201 and the plurality of peripheral pouring heads 202 pouring the ultra-high performance concrete into the mold cavity 200, the central vibrating rod 203 synchronously vibrates longitudinally and drives the plurality of movable bars 205 to swing and vibrate.

[0071] The density and uniformity of the concrete are improved by the vibration of the central vibrating rod 203 . Meanwhile, the swinging vibration of the movable bar 205 can effectively reduce bubbles and voids in the concrete, further improving the performance of the road slab.

[0072] In this embodiment, in the preparation step 4), the movable bar 205 is arranged in a multi-section curved shape along the extending direction of the movable bar 205 from the inside to the outside. During the longitudinal vibration of the central vibrating rod 203, the movable bar 205 swings and vibrates in a wave-like manner.

[0073] By utilizing the multi-section curved shape of the movable bar 205 , a more complex vibration mode can be generated during the vibration process, thereby further improving the density and uniformity of the concrete.

[0074] The following will be combined with the embodiments of the present invention to describe the technical solutions in the embodiments of the present invention in a specific, clear and complete manner to make the content of the method for preparing a road slab based on ultra-high performance concrete easier to understand:

[0075] 1. Preparation process

[0076] According to the actual working conditions of ultra-high performance concrete road slabs, the size of the prefabricated road slabs is determined to be 2.0×3.0m. Steel formwork is preferred. Prefabricated concrete road components are seam-free. To ensure the convenience of dismantling, lifting and transportation of the road slabs, reduce the construction difficulty during paving and dismantling, and reduce the weight of the road slabs, the actual thickness of the road slabs is 100mm.

[0077] The reinforcement of prefabricated road slabs must be intact and have sufficient strength. The steel formwork is assembled by welding, and the weld strength must be guaranteed. The surface is ground, polished or anti-corrosion treated. After the building waterproof membrane is pre-laid, the vertical steel formwork is assembled one by one. The maximum allowable dimensional error between the length and width of the surface layer is no more than 3mm, and the maximum allowable difference between the two diagonal lengths is usually no more than 5mm. The deviation of the longitudinal one-time formwork size cannot exceed 5mm.

[0078] Among them, the order of steel mesh binding is: set up the mesh steel bar binding operation frame, bind the upper and lower mesh bars separately, bind the hooks and bind the radial bars;

[0079] Before pouring concrete, the steel bars, the diameter of the steel bars in the slab, and the slab surface hangers should be inspected again. Dust, rainwater inside the steel bars and stains on the surface of the steel bars should be removed in time. Concrete construction must be vibrated simultaneously and in one direction to ensure the density of the concrete.

[0080] After pouring is completed, timely trimming and smoothing should be carried out, and the surface layer of the prefabricated road slabs should be smoothed and polished as required. It is strictly forbidden to have unevenness. After the concrete construction, timely film insulation and moisture maintenance should be adopted. The formwork should be removed after the concrete is finally set. The slabs should be transported and stacked on site, and the project department's forklift should be used for turnover and stacking. In order to avoid water accumulation, drainage measures should be considered. Two short wooden beams are used under each layer of prefabricated road slabs, and the upper and lower layers of wood should be in the same position.

[0081] 2. Mechanical properties test

[0082] The cured ultra-high performance concrete road slab was placed on a 200t gantry reaction frame and loaded using an actuator in conjunction with the reaction frame and reaction plate. A three-point loading method was used. It was observed that when the cracking load was reached, multiple transverse fine cracks appeared near the mid-span of the slab bottom.

[0083] As the loading continues, the cracks gradually increase in number and density, their width increases and extends to the edge of the plate. When the peak load is reached, multiple transverse main cracks develop to the edge of the plate and gradually penetrate to the side of the plate. Subsequently, the bearing capacity of the specimen decreases. When most of the main cracks penetrate the bottom of the plate and develop to 2 / 3 of the height of the side of the plate, the specimen is judged to have reached the failure state.

[0084] Unlike ordinary concrete road slabs that only have one through-going main crack, when the ultra-high performance concrete road slab is finally destroyed, there are multiple transverse main cracks distributed on the bottom of the slab in the pure bending section. Its measured performance data can match similar ultra-high performance concrete road slab products on the market. The bulldozer bearing capacity test also proves the excellent bearing capacity performance of this ultra-high performance concrete road slab.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a road slab based on ultra-high performance concrete, characterized in that: The following steps are included: 1) Pre-lay waterproof film on the ground; 2) Building a steel template on the waterproof film, the steel template is annularly closed and enclosed to form a mold cavity, the top of the mold cavity has a top opening, the bottom of the mold cavity has a bottom opening, and the waterproof film seals the bottom opening; 3) Building a plurality of steel mesh layers in the mold cavity, wherein the plurality of steel mesh layers are sequentially spaced along the height of the mold cavity; 4) pouring ultra-high performance concrete into the mold cavity, wherein the ultra-high performance concrete completely fills the mold cavity and wraps the plurality of steel mesh layers, and the ultra-high performance concrete has a top end surface filled in the top opening; 5) Smoothing the top end surface to make it flat; 6) Covering the top end surface with a curing film layer and performing thermal insulation and moisture maintenance on the ultra-high performance concrete until the ultra-high performance concrete solidifies to form a road slab; 7) Remove the steel formwork to separate the steel formwork from the road slab.

2. The method for preparing a road slab based on ultra-high performance concrete according to claim 1, wherein: In the preparation step 1), after the waterproof film is pre-laid on the ground, water mist is sprayed on the waterproof film to keep the waterproof film in a wet state.

3. The method for preparing a road slab based on ultra-high performance concrete according to claim 1, wherein: In the preparation step 2), the steel template is formed by welding.

4. The method for preparing a road slab based on ultra-high performance concrete according to claim 1, wherein: In the preparation step 2), the steel template has a plurality of weld seams, and the weld seams are ground, polished or anti-corrosion treated.

5. The method for preparing a road slab based on ultra-high performance concrete according to claim 1, wherein: In the preparation step 3), the inner side wall of the steel formwork has an inner side wall facing the mold cavity, and the outer periphery of the steel mesh layer is butted against the inner side wall; in the preparation step 7), when the road slab is separated from the steel formwork, the outer periphery of the steel mesh layer is exposed on the outer periphery of the road slab.

6. The method for preparing a road slab based on ultra-high performance concrete according to any one of claims 1 to 5, characterized in that: In the preparation step 3), the plurality of steel mesh layers are arranged in a horizontally flat manner, the plurality of steel mesh layers are provided with a plurality of longitudinal ribs arranged longitudinally, and the plurality of longitudinal ribs are arranged at intervals along the flattening direction of the steel mesh layers; the longitudinal ribs pass through the plurality of steel mesh layers and are fixedly connected to the plurality of steel mesh layers as a whole; The lower portion of the longitudinal rib comprises a lower section located below the plurality of steel mesh layers, the lower section being flush with the bottom opening and abutting against the waterproof membrane, and the upper portion of the longitudinal rib comprises an upper section located above the plurality of steel mesh layers, the upper section being flush with the top opening; In the preparation step 4), when the mold cavity is filled with ultra-high performance concrete, the bottom of the lower section is exposed at the bottom of the ultra-high performance concrete, and the top of the upper section is exposed at the top end surface of the ultra-high performance concrete.

7. The method for preparing a road slab based on ultra-high performance concrete according to claim 6, wherein: In the preparation arrangement 3), a plurality of lower slanted bars are provided on the periphery of the lower section, the plurality of lower slanted bars are arranged around the periphery of the lower section at intervals and extend from bottom to top into the mold cavity; a plurality of upper slanted bars are provided on the periphery of the upper section, the plurality of upper slanted bars are arranged around the periphery of the upper section at intervals and extend from top to bottom into the mold cavity; In the preparation step 4), after the mold cavity is filled with ultra-high performance concrete, the plurality of upper inclined strips and the plurality of lower inclined strips are wrapped in the ultra-high performance concrete.

8. The method for preparing a road slab based on ultra-high performance concrete according to any one of claims 1 to 5, characterized in that: In the preparation step 4), a central casting head and multiple peripheral casting heads are arranged above the mold cavity, the central casting head is aligned with the center of the mold cavity, and the multiple peripheral casting heads are arranged around the periphery of the central casting head at intervals; ultra-high performance concrete is synchronously poured into the mold cavity through the central casting head and the multiple peripheral casting heads, and the pouring flow rate of the central casting head is greater than the pouring flow rate of the peripheral casting heads.

9. The method for preparing a road slab based on ultra-high performance concrete according to claim 8, wherein: In the preparation step 4), a central vibrating rod is inserted into the mold cavity along the downward casting direction of the central casting head, and the central vibrating rod has an insertion section inserted into the mold cavity; a plurality of movable bars are connected to the periphery of the insertion section, and the plurality of movable bars are arranged around the periphery of the insertion section at intervals, the inner ends of the movable bars are movably connected to the insertion section, and the outer ends of the movable bars are freely extended outward, and the outer ends of the movable bars are aligned with the peripheral casting head in a vertical manner; In the preparation step 4), during the process of pouring the ultra-high performance concrete into the mold cavity by the central pouring head and the plurality of peripheral pouring heads, the central vibrating rod synchronously vibrates longitudinally and drives the plurality of movable bars to swing and vibrate.

10. The method for preparing a road slab based on ultra-high performance concrete according to claim 9, wherein: In the preparation step 4), the movable strip is arranged in a multi-section curved shape along the extension direction of the movable strip from the inside to the outside, and during the longitudinal vibration of the central vibrating rod, the movable strip swings and vibrates in a wave-like manner.

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