A detachable precast concrete pavement slab

Abstract

This utility model relates to a detachable precast concrete pavement panel, comprising a concrete body, a reinforcing mesh, and lifting ring assemblies positioned at the four corners of the top of the concrete body. The reinforcing mesh includes an upper layer and a lower layer, respectively arranged near the upper and lower surfaces of the concrete body. The lifting ring assemblies include a pair of embedded sleeves, two pairs of sleeve supports, and a lifting rod. The two pairs of sleeve supports are welded to the lower layer of reinforcing mesh, and the embedded sleeves are welded to the top of the pair of sleeve supports and located below the upper layer of reinforcing mesh. A pre-drilled hole corresponding to the gap between the pair of embedded sleeves is provided at the top of the concrete body. The lifting rod, in an inverted U-shape, is inserted into the pre-drilled hole and detachably connected to the embedded sleeve. This utility model achieves rapid construction through the splicing of precast concrete pavement panels, saving construction time. After disassembly, it can be reused, ensuring construction efficiency while reducing construction waste, embodying the green construction and sustainable development concepts of temporary projects.

Description

Technical Field

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[0001] The utility model relates to the technical field of construction engineering construction, in particular to a detachable precast concrete road slab. Background Art

[0002] Concrete temporary roads are widely used in engineering construction, mainly for vehicle passage on the construction site, equipment transportation and temporary site hardening requirements. Its typical application scenarios include heavy machinery operation areas during the earthwork excavation stage, material yard turnover areas, temporary construction roads for large-scale construction projects, and emergency rescue channels, etc. Compared with traditional steel plate or gravel roads, concrete temporary roads have the advantages of convenient construction, high surface flatness, effective reduction of dust pollution, compliance with environmental protection requirements, low maintenance cost, and no need for frequent repair. With expansion joints and drainage ditches, the stability and durability of the temporary road can be ensured.

[0003] However, in most projects, traditional in-situ construction technology is still used for temporary roads. When the project ends, the concrete road slabs are mostly demolished by crushing, generating a large amount of construction waste. The recycled materials can only be downgraded to aggregate filling, with poor economy and not in line with the concept of green development. Summary of the Invention

[0004] The utility model aims to solve the deficiencies of the prior art and provides a detachable precast concrete road slab.

[0005] To achieve the above object, the utility model adopts the following technical solutions: A detachable precast concrete road slab includes a concrete body and a steel mesh. It also includes lifting ring assemblies arranged at the four corners of the top of the concrete body. The steel mesh includes an upper steel mesh and a lower steel mesh respectively arranged close to the upper and lower surfaces of the concrete body. The lifting ring assemblies include a pair of embedded sleeves, two pairs of sleeve brackets, and suspension rods. The two pairs of sleeve brackets are correspondingly welded on the lower steel mesh. The embedded sleeves are welded on the top of a pair of sleeve brackets and are located below the upper steel mesh. The top of the concrete body is provided with reserved holes corresponding to the gaps of the pair of embedded sleeves. The suspension rods are in an inverted U shape, inserted into the reserved holes and detachably connected to the embedded sleeves.

[0006] Specifically, bolt holes are provided at the centers of the opposite surfaces of the pair of embedded sleeves. A connecting plate is provided at the bottom of the vertical rod of the suspension rod. Through holes corresponding to the bolt holes are provided on the connecting plate. The suspension rod is fixed by screwing a bolt through the through hole into the bolt hole.

[0007] Specifically, the sleeve brackets are in a "ji" shape.

[0008] Specifically, the installation of the upper steel mesh and the lower steel mesh is supported and temporarily fixed by using cushion blocks or stirrup bars.

[0009] Specifically, a 1%-2% cross slope is set on the top of the concrete body for draining water from the road slab to both sides.

[0010] The beneficial effects of this utility model are:

[0011] The concrete pavement slabs are manufactured using a factory prefabrication process, ensuring precise concrete mix proportions, good curing effects, and stable and controllable quality. The prefabricated concrete pavement slabs are detachable and installable, enabling modular and rapid construction and significantly shortening the construction period for temporary roads. After the project is completed, the prefabricated concrete pavement slabs can be disassembled and reused, reducing material waste and providing significant environmental benefits. They also avoid the construction waste generated by the breakage of traditional cast-in-place roads, resulting in substantial economic benefits. Maintenance is convenient; damaged sections can be replaced individually, and within a certain range, they can be reused and allocated across projects. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is an exploded view of the lifting ring assembly structure of this utility model;

[0014] Figure 3 This is a schematic diagram showing the positions of the embedded sleeve, sleeve support, and steel mesh of this utility model;

[0015] In the diagram: 1-Concrete body; 101-Reserved hole; 2-Reinforcing mesh; 201-Upper reinforcing mesh; 202-Lower reinforcing mesh; 3-Lifting ring assembly; 301-Embedded sleeve; 302-Sleeve bracket; 303-Lifting rod; 304-Bolt hole; 305-Connecting plate; 306-Through hole; 4-Concrete body side formwork; 5-Reserved hole side formwork;

[0016] The following will describe in detail the embodiments of this utility model with reference to the accompanying drawings. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] like Figures 1-3 As shown, a detachable precast concrete pavement slab includes a concrete body 1, a steel mesh 2, and lifting ring assemblies 3 set at the four corners of the top of the concrete body 1. The top of the concrete body 1 is provided with a 1%-2% cross slope for drainage to both sides of the pavement slab. The steel mesh 2 includes an upper steel mesh 201 and a lower steel mesh 202 respectively arranged close to the upper and lower surfaces of the concrete body 1. The upper steel mesh 201 and the lower steel mesh 202 are installed using spacers or stirrups for support and temporary fixation to ensure accurate steel bar positioning and that the thickness of the steel bar protective layer meets the requirements.

[0019] Specifically, spacers and stirrups can be placed at the four corners and edges. If spacers are used, they can be tied or fixed to the reinforcing bars with special clamps to prevent displacement during the pouring process. The upper and lower layers of spacers must be vertically aligned to avoid eccentric stress and ensure that the thickness of the concrete cover of the reinforcing bars meets the requirements. If stirrups are used, they can be welded to the reinforcing bars for fixation.

[0020] After the steel mesh 2 is installed, the concrete side formwork 4 and the pre-drilled hole side formwork 5 are erected. The concrete side formwork 4 is arranged along the length and width of the road panel. The pre-drilled hole side formwork 5 is arranged around the lifting ring assembly 3, with a length of 100-200mm and a height of 200mm. The heights of the concrete side formwork 4 on opposite sides of the road panel are slightly different to ensure that a 1%-2% cross slope is formed on the top surface after the concrete is poured.

[0021] The precast concrete pavement slabs are 3m long, 2m wide, and 20-30cm thick, suitable for various temporary road width requirements. The concrete strength grade can be C25-C40, combined with early-strength agents and water-reducing agents. Each slab is equipped with a double-layer, bidirectional steel mesh, with steel bars of 8-12mm diameter and a spacing of 100-200mm. The upper steel mesh (201) resists negative bending moments, controls concrete shrinkage cracks, and distributes concentrated loads. The lower steel mesh (202) resists positive bending moments at the bottom of the slab, improving the flexural stiffness of the section and reducing deflection.

[0022] The lifting ring assembly 3 includes a pair of embedded sleeves 301, two pairs of sleeve supports 302, and a lifting rod 303. The two pairs of sleeve supports 302 are welded to the lower steel mesh 202. The embedded sleeves 301 are welded to the top of the pair of sleeve supports 302 and located below the upper steel mesh 201. The top of the concrete body 1 is provided with a reserved hole 101 corresponding to the gap between the pair of embedded sleeves 301. The lifting rod 303 is inverted U-shaped and is inserted into the reserved hole 101 and detachably connected to the embedded sleeves 301. The center of the opposite surface of the pair of embedded sleeves 301 is provided with a bolt hole 304. The bottom of the vertical rod of the lifting rod 303 is provided with a connecting plate 305. The connecting plate 305 is provided with a through hole 306 corresponding to the bolt hole 304. The lifting rod 303 is fixed by bolts passing through the through hole 306 and screwing into the bolt hole 304.

[0023] Specifically, each lifting ring assembly 3 is equipped with two embedded sleeves 301, and each embedded sleeve 301 is equipped with two sleeve supports 302. The sleeve supports 302 can be made of steel bars, are in a "U" shape, and are welded to the lower steel mesh 202. The embedded sleeves 301 and sleeve supports 302 are connected by welding. The lifting rod 303 can be made of plate and steel bars. The vertical and horizontal bars of the lifting rod 303 are connected by welding. The connecting plate 305 of the lifting rod 303 has through holes 306. The lifting rod 303 and the embedded sleeves 301 are connected by bolts to form a lifting ring. The lifting rod 303 is a detachable structure and is only temporarily installed when the road panel is hoisted. It will not affect the normal traffic flow during construction.

[0024] Precast concrete pavement slabs are manufactured in the factory. The main construction process is as follows: construction preparation → installation of steel mesh 2 → formwork installation → pre-embedding of lifting ring components 3 → concrete pouring → vibration curing → formwork removal → finished product acceptance.

[0025] When manufacturing concrete pavement slabs in the factory, the steel mesh 2 is first installed and the concrete body side formwork 4 is erected. Due to the presence of the lifting ring assembly 3, the lower steel mesh 202 needs to be installed first, followed by the lifting ring assembly 3. To ensure the accurate positioning of the lifting ring assembly 3, the sleeve bracket 302 is welded to the lower steel mesh 202. Then, the embedded sleeve 301 is installed and welded to the sleeve bracket 302. Subsequently, the upper steel mesh 201 and the reserved hole side formwork 5 are installed. Next, the concrete body 1 is poured. After vibration curing, the concrete body 1 forms an effective bond with the steel mesh 2 and the lifting ring assembly 3. Then, the concrete body side formwork 4 and the reserved hole side formwork 5 are removed. Finally, the finished product is inspected.

[0026] Temporary support structures are arranged on the two opposite pre-drilled hole side formworks 5 to prevent the pre-drilled hole side formworks 5 from overturning during concrete pouring. When pouring concrete body 1, it can be compacted by vibrating table and steam cured, and the curing temperature and humidity are controlled. After the concrete strength reaches the design requirements, the concrete body side formwork 4 and the pre-drilled hole side formwork 5 are removed.

[0027] After the concrete pavement slabs pass factory inspection, they can be transported to the construction site and hoisted and laid according to the temporary road slab layout. After the concrete pavement slabs are laid, the gaps between the concrete pavement slabs are filled with caulking materials such as polyurethane sealant, silicone elastic sealant, or precast foam rubber strips. During removal, if the caulking material is reusable, it is directly recycled; if it is not reusable, the residue is removed mechanically. After the caulking material treatment is completed, the lifting rod 303 is installed on the pre-embedded sleeve 301, and then mechanical equipment is used to lift and retrieve the pavement slabs, achieving the purpose of reuse.

[0028] This invention achieves a dual improvement in construction efficiency and resource benefits through the industrialized production and modular application of precast concrete pavement panels. Specific advantages include: factory prefabrication improves the performance of concrete components, ensuring stable and controllable quality; compared to traditional cast-in-place processes, detachable precast concrete pavement panels enable rapid modular construction, significantly shortening the construction period for temporary roads; after project completion, the pavement panels can be disassembled and recycled, greatly reducing material loss and construction waste generation, resulting in significant environmental benefits; maintenance is convenient, with individual damaged panels replaceable, and cross-project reusability is possible within a certain scope.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A detachable precast concrete pavement slab comprising a concrete body (1), a steel mesh (2), characterized in that, It further includes lifting ring assemblies (3) arranged at the four corners of the top of the concrete body (1). The steel bar mesh (2) includes an upper layer steel bar mesh (201) and a lower layer steel bar mesh (202) respectively arranged close to the upper and lower surfaces of the concrete body (1). The lifting ring assembly (3) includes a pair of embedded sleeves (301), two pairs of sleeve brackets (302), and a suspension rod (303). The two pairs of sleeve brackets (302) are correspondingly welded on the lower layer steel bar mesh (202). The embedded sleeve (301) is welded on the top of a pair of sleeve brackets (302) and is located below the upper layer steel bar mesh (201). A reserved hole (101) corresponding to the clearance of the pair of embedded sleeves (301) is provided at the top of the concrete body (1). The suspension rod (303) is in an inverted U shape, inserted into the reserved hole (101) and detachably connected to the embedded sleeve (301).

2. A demountable precast concrete pavement panel according to claim 1, characterised in that, A bolt hole (304) is provided at the center of the opposite surfaces of the pair of embedded sleeves (301). A connecting plate (305) is provided at the bottom of the vertical rod of the suspension rod (303). A through hole (306) corresponding to the bolt hole (304) is provided on the connecting plate (305). The suspension rod (303) is fixed by screwing a bolt through the through hole (306) into the bolt hole (304).

3. A detachable precast concrete pavement panel according to claim 1, wherein The sleeve bracket (302) is in a "U" shape.

4. A detachable precast concrete pavement panel according to claim 1, wherein The installation of the upper layer steel bar mesh (201) and the lower layer steel bar mesh (202) is supported and temporarily fixed by using cushion blocks or stirrup bars.

5. A detachable precast concrete pavement panel according to claim 1, wherein A cross slope of 1%-2% is set at the top of the concrete body (1) for draining the road surface water to both sides.

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