Shear reinforcement structure of municipal road intersection pavement

Abstract

The utility model provides a municipal road intersection pavement shear strength reinforcing structure belongs to road engineering technical field to solve the problem of insufficient shear strength, including cushion, the cushion top is paved with base layer, and base layer top is paved with structure support layer, structure support layer top is paved with shear strength reinforcing layer, and shear strength reinforcing layer top is paved with surface function layer, through setting up the double twisted hexagonal metal net in structure support layer, can form three -dimensional stereoscopic reinforcing system, effectively disperses the horizontal shear force that intersection vehicle turns to, brakes produces, utilizes the S shape prestressed reinforcement A and prestressed reinforcement B of vertical intersection arrangement in shear strength reinforcing layer, can form the cross type prestressed skeleton, can resist vehicle turning's horizontal torque and brake longitudinal shear force simultaneously, is favorable to the shear strength of reinforcing, is favorable to the horizontal shear force of resisting intersection characteristic.

Description

Technical Field

[0001] This utility model belongs to the field of road engineering technology, and more specifically, it relates to a shear reinforcement structure for road surfaces at municipal road intersections. Background Technology

[0002] In municipal road traffic systems, intersections, as core areas for vehicle turning, merging, and speed changes, are subjected to complex mechanical forces over long periods. Frequent starting, stopping, turning, and emergency braking operations cause intersection pavements to experience shear stresses far exceeding those of ordinary road sections. Currently, traditional intersection pavement structures typically employ a layered paving design, using graded crushed stone or cement-stabilized crushed stone as the base layer and asphalt concrete as the surface layer. However, due to the insufficient shear strength of ordinary asphalt mixtures, they are ill-suited to resist the unique horizontal shear forces present at intersections. Furthermore, conventional pavement materials are highly sensitive to temperature changes; high summer temperatures can cause asphalt softening, while low winter temperatures may trigger shrinkage cracking, further weakening the structure's shear resistance. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a shear-strengthening structure for municipal road intersections, thereby resolving the issue of insufficient shear strength and difficulty in resisting the unique horizontal shear force of intersections mentioned in the background art.

[0004] This utility model relates to a shear reinforcement structure for municipal road intersections, comprising: a subbase; a base course laid on top of the subbase, and a structural support layer laid on top of the base course; a shear reinforcement layer laid on top of the structural support layer, and a surface functional layer laid on top of the shear reinforcement layer; a three-dimensional reinforcing mesh laid inside the structural support layer, the three-dimensional reinforcing mesh being configured as a double-twisted hexagonal metal mesh; prestressed tendons A laid inside the bottom side of the shear reinforcement layer, the prestressed tendons A being configured as an S-shaped structure and laid in a straight line; the surface functional layer being composed of a mixture of high-viscosity SBS modified asphalt and basalt aggregate, and the thickness of the surface functional layer being set to 6 cm.

[0005] Furthermore, the cushion layer is made of crushed stone, and the thickness of the cushion layer is set to 30 centimeters.

[0006] Furthermore, the base layer is made of a mixture of graded crushed stone and rubber granules, and a geogrid is laid inside the base layer, with a thickness of 10 centimeters.

[0007] Furthermore, the structural support layer is made of cement-stabilized crushed stone, and the cement-stabilized crushed stone completely wraps the three-dimensional reinforcing mesh, and the thickness of the structural support layer is set to 15 cm.

[0008] Furthermore, prestressed tendons B are laid inside the top side of the shear reinforcement layer, and the prestressed tendons B are configured as an S-shaped structure; the prestressed tendons B are arranged in a straight line, and the prestressed tendons B are arranged perpendicular to the prestressed tendons A.

[0009] Furthermore, the shear reinforcement layer is made of a mixture of rubber powder modified asphalt and steel fiber reinforced concrete, and the thickness of the shear reinforcement layer is set to 8 cm.

[0010] Furthermore, the surface functional layer is doped with polyester fibers in a certain proportion, and the upper surface of the surface functional layer is roughened.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model, by setting a double-twisted hexagonal metal mesh within the structural support layer, can form a three-dimensional reinforced system, effectively dispersing the horizontal shear force generated by vehicle turning and braking at intersections. Simultaneously, by utilizing the vertically intersecting S-shaped prestressed tendons A and B within the shear reinforcement layer, a cross-type prestressed skeleton can be formed, which can simultaneously resist the lateral torque of vehicle turning and the longitudinal shear force of braking, thus enhancing shear strength and resisting the unique horizontal shear force of intersections.

[0012] 2. The base layer of this utility model uses a mixture of graded crushed stone and rubber particles, combined with rubber powder modified asphalt in the shear reinforcement layer. This utilizes the elasticity of rubber to reduce the risk of high-temperature softening, while simultaneously absorbing vehicle impact energy and reducing reflective cracking. Furthermore, the steel fiber reinforced concrete further inhibits the propagation of microcracks, extending the fatigue life of the structure.

[0013] 3. The surface functional layer of this utility model is constructed using a composite pavement of high-viscosity SBS modified asphalt and basalt aggregate. By incorporating polyester fibers to form a three-dimensional fiber-reinforced structure, the interfacial adhesion strength between the asphalt and aggregate is significantly improved, effectively suppressing aggregate spalling caused by adhesion failure under high-temperature conditions. Simultaneously, the surface layer undergoes a roughening process to form a micro-rough textured structure, enhancing the surface friction coefficient under wet conditions and meeting the anti-skid performance requirements of frequent vehicle starts and stops and sudden braking at intersections. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a structural schematic diagram of prestressed tendon A and prestressed tendon B of this utility model; Figure 3 This is a schematic diagram of the structure of the three-dimensional reinforced mesh of this utility model; In the diagram, the correspondence between component names and drawing numbers is as follows: 1. Subbase; 2. Base layer; 3. Structural support layer; 301. Three-dimensional reinforcing mesh; 4. Shear reinforcement layer; 401. Prestressed tendon A; 402. Prestressed tendon B; 5. Surface functional layer. Detailed Implementation

[0015] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. Example 1:

[0016] As attached Figure 1 To be continued Figure 3 As shown, this utility model provides a shear reinforcement structure for a municipal road intersection, including a subbase 1; a base course 2 is laid on top of the subbase 1, and a structural support layer 3 is laid on top of the base course 2; a shear reinforcement layer 4 is laid on top of the structural support layer 3, and a surface functional layer 5 is laid on top of the shear reinforcement layer 4; a three-dimensional reinforcing mesh 301 is laid inside the structural support layer 3, and the three-dimensional reinforcing mesh 301 is set as a double-twisted hexagonal metal mesh; prestressed tendons A401 are laid inside the bottom side of the shear reinforcement layer 4, and the prestressed tendons A401 are set as an S-shaped structure and laid in a straight line; the surface functional layer 5 is made of a mixture of high-viscosity SBS modified asphalt and basalt aggregate, and the thickness of the surface functional layer 5 is set to 6 cm. The subbase 1 is made of crushed stone, and the thickness of the subbase 1 is set to 30 cm. The base course 2 is made of a mixture of graded crushed stone and rubber granules, and a geogrid is also laid inside the base course 2, and the thickness of the base course 2 is set to 10 cm. The structural support layer 3 is made of cement-stabilized crushed stone, and the cement-stabilized crushed stone completely wraps the three-dimensional reinforcing mesh 301. The thickness of the structural support layer 3 is set to 15 cm.

[0017] This invention utilizes a double-twisted hexagonal metal mesh within the structural support layer 3 to form a three-dimensional reinforced system, effectively dispersing the horizontal shear force generated by vehicle turning and braking at intersections. Example 2:

[0018] As attached Figure 1 With appendix Figure 2 As shown: Based on Example 1, prestressed tendons B402 are laid inside the top side of the shear reinforcement layer 4, and the prestressed tendons B402 are set as an S-shaped structure; the prestressed tendons B402 are arranged in a straight line, and the prestressed tendons B402 are set perpendicular to the prestressed tendons A401; the shear reinforcement layer 4 is made of rubber powder modified asphalt and steel fiber reinforced concrete, and the thickness of the shear reinforcement layer 4 is set to 8 cm.

[0019] This invention utilizes S-shaped prestressed tendons A401 and B402 arranged vertically and crosswise within the shear reinforcement layer 4 to form a cross-type prestressed skeleton, which can simultaneously resist the lateral torque of vehicle steering and the longitudinal shear force of braking. Example 3:

[0020] As attached Figure 1 As shown: Based on Examples 1 and 2, polyester fibers are mixed in a certain proportion inside the surface functional layer 5. The polyester fibers are used to enhance the adhesion between asphalt and basalt aggregate and reduce high-temperature softening. The upper surface of the surface functional layer 5 is roughened to improve the anti-skid performance in rainy weather and adapt to the frequent braking requirements of intersections.

[0021] The surface functional layer 5 of this utility model is constructed by composite paving of high-viscosity SBS modified asphalt and basalt aggregate. By incorporating polyester fiber to form a three-dimensional fiber-reinforced structure, the interfacial adhesion strength between asphalt and aggregate is significantly improved, effectively suppressing aggregate peeling caused by adhesion failure under high temperature conditions.

[0022] This invention employs a layered, compacted foundation layer 1 made of crushed stone, serving as a stress diffusion layer for the overall structure. Its high permeability allows for rapid drainage of groundwater, preventing water accumulation and softening of the base layer 2, while simultaneously providing uniform support for the superstructure. Graded crushed stone and rubber granules are mixed in a specific ratio and then laid out, with geogrid embedded within to form the base layer 2. The elastic deformation capacity of the rubber granules absorbs vehicle impact energy, reducing crack reflection. The geogrid restricts particle displacement through friction, enhancing the integrity of the base layer 2 and adapting to frequent vehicle start-stop loads at intersections. The structural support layer 3 forms a three-dimensional reinforced skeleton by embedding a three-dimensional reinforcing mesh 301 within the cement-stabilized crushed stone. The cement slurry completely encapsulates the three-dimensional reinforcing mesh 301. The shear reinforcement layer 4 consists of layered S-shaped prestressed tendons A401 and B402, arranged perpendicularly.

[0023] This invention applies prestress through a tensioning process, creating a compressive stress field within the concrete to counteract the tensile stress generated by vehicle braking. The composite effect of steel fiber reinforced concrete and rubber powder modified asphalt further inhibits the propagation of microcracks and improves fatigue resistance. The surface functional layer 5 is constructed by mixing high-viscosity SBS modified asphalt with basalt aggregate, and incorporates polyester fibers to form a fiber-asphalt composite structure. The polyester fibers prevent the asphalt from flowing and deforming at high temperatures and enhance aggregate adhesion. The surface roughening treatment creates a micro-rough texture, forming drainage channels in rainy weather and increasing the tire-road contact friction coefficient to meet anti-skid requirements during emergency braking.

Claims

1. A shear reinforcement structure for road surface at a municipal road intersection, comprising a subbase (1), wherein a base course (2) is laid on top of the subbase (1), and a structural support layer (3) is laid on top of the base course (2); characterized in that, The structural support layer (3) is topped with a shear reinforcement layer (4), and the shear reinforcement layer (4) is topped with a surface functional layer (5); the structural support layer (3) is internally covered with a three-dimensional reinforcing mesh (301), and the three-dimensional reinforcing mesh (301) is configured as a double-twisted hexagonal metal mesh; the shear reinforcement layer (4) is internally covered with prestressed tendons A (401), and the prestressed tendons A (401) is configured as an S-shaped structure, and the prestressed tendons A (401) are laid in a straight line arrangement; the surface functional layer (5) is made of a mixture of high viscosity SBS modified asphalt and basalt aggregate, and the thickness of the surface functional layer (5) is set to 6 cm.

2. The shear reinforcement structure for municipal road intersections according to claim 1, characterized in that: The cushion layer (1) is made of crushed stone and the thickness of the cushion layer (1) is set to 30 cm.

3. The shear reinforcement structure for municipal road intersections according to claim 1, characterized in that: The base layer (2) is made of graded crushed stone and rubber granules mixture, and geogrid is also laid inside the base layer (2), and the thickness of the base layer (2) is set to 10 cm.

4. The shear reinforcement structure for municipal road intersections according to claim 1, characterized in that: The structural support layer (3) is made of cement-stabilized crushed stone, and the cement-stabilized crushed stone completely wraps the three-dimensional reinforced mesh (301), and the thickness of the structural support layer (3) is set to 15 cm.

5. The shear reinforcement structure for municipal road intersections according to claim 1, characterized in that: The shear reinforcement layer (4) is provided with prestressed tendons B (402) on the top side, and the prestressed tendons B (402) are set as an S-shaped structure; the prestressed tendons B (402) are arranged in a straight line, and the prestressed tendons B (402) are perpendicular to the prestressed tendons A (401).

6. The shear reinforcement structure for municipal road intersections according to claim 1, characterized in that: The shear reinforcement layer (4) is made of rubber powder modified asphalt and steel fiber reinforced concrete, and the thickness of the shear reinforcement layer (4) is set to 8 cm.

7. The shear reinforcement structure for municipal road intersections according to claim 1, characterized in that: The surface functional layer (5) is doped with polyester fibers, and the upper surface of the surface functional layer (5) is roughened.

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