Rigid-flexible composite structural pavement and cast-in-place method and prefabricating method for manufacturing rigid-flexible composite structural pavement

Abstract

The invention relates to a rigid-flexible composite structural pavement and a cast-in-place method and a prefabricating method for manufacturing the rigid-flexible composite structural pavement. The rigid-flexible composite structural pavement comprises a roadbed layer, a cushion layer, a base layer, a rigid layer and a flexible layer, wherein the rigid layer comprises a plurality of regularly arranged rigid building blocks among which gaps are reserved; and the flexible layer comprises a flexible filling layer and a flexible surface layer. The top of the rigid layer is designed to a regular honeycomb concave-convex structure, and the flexible asphalt concrete layer is formed by using the property of the flexible asphalt concrete material and used for coating and filling the concave-convex gaps of the rigid building block structures, so that the pavement has the properties of rigid and flexible pavements and has the structural characteristic of rigid-flexible composite stress; and the construction cost of a road is greatly saved, the heavy-duty traffic impact resistance of the base layer of the road is greatly reinforced, the service life of the road is greatly prolonged, and the pavement is suitable for large-scale popularization and use.

Description

technical field [0001] The present application relates to a rigid-flexible composite structure pavement, a cast-in-place method and a prefabrication method for manufacturing the pavement. Background technique [0002] At present, the pavement structure design of road engineering in my country is divided into two types: rigid pavement and flexible pavement. The flexible pavement design is based on the elastic system theory, and the structural design is based on the three-layer elastic system theory under the action of double-circle uniform vertical and horizontal loads. The table shows three design indicators of allowable springback deflection, allowable bending tensile stress and allowable shear stress. (People's Republic of China industry standard "Urban Road Design Code" CJJ37-90). The road load-bearing layer of the flexible pavement is the road base, and the base is divided into stabilized binders (organic binders and inorganic binders) and aggregates without binders (int...

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Problems solved by technology

[0004] 1. Due to the influence of thermal expansion and contraction of temperature, the temperature cracks produced by cement-stabilized macadam base cannot be avoided, and the reflection cracks caused by asphalt pavement have become one of the most important factors affecting the service life of the road

[0005] 2. Since the cement-stabilized crushed stone structure is to reduce shrinkage cracks, the amount of cement is strictly limited (less than 6%), which makes this structure low in strength (3.5MPa for expressway design) and the impact fatigue resistance is not strong. The subgrade is seriously damaged under repeated impacts, which has become one of the most important factors of road damage in our country

[0006] 3. Cement stabilizes the crushed stone structure, resulting in the current road service life of heavy-duty traffic in my country is basically 5-8 years, which is far less than the average service life of foreign roads

[0007] In response to this problem, foreign countries began to design and use full-thickness long-life pavement in the 1980s. The road structure all adopts flexible asphalt pavement structure, but the cost of road engineering is very high, and it is not suitable for large-scale promotion and use in my country.

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