Bridge asphalt pavement structure and construction method

Abstract

The invention discloses a bridge asphalt pavement structure and a construction method, and belongs to the field of pavement construction. The bridge asphalt pavement structure comprises a roadbed andan upper layer paved on the roadbed. The upper layer is provided with an expansion joint in the longitudinal direction, and the upper layer comprises an asphalt concrete layer located at a lower layerand an asphalt mixture layer. The asphalt mixture layer comprises a dense-graded asphalt mixture and an open-graded asphalt mixture, and the asphalt mixture layer has a thickness of 1.8-2.3cm. Duringthe construction, part of the upper layer is dug and removed, and then the dense-graded asphalt mixture and the open-graded asphalt mixture are paved. The construction method only needs to dig and remove about half of the thickness of the upper layer of the road surface, and energy saving and environmental protection are achieved. After the digging and removing thickness is reduced, the construction time is relatively shortened, construction noise and dust pollution are further reduced, and the interference with existing traffic and surrounding residents is reduced. The combination of the open-graded asphalt mixture and the dense-graded asphalt mixture is conducive to drainage and noise absorption, and the road surface is more secure.

Description

technical field [0001] The invention relates to the field of road surface construction, in particular to a bridge asphalt pavement structure and a construction method. Background technique [0002] The asphalt material has high compressibility and can buffer the vertical vibration of vehicles; it does not need to be grooved on the surface of the road surface in order to increase the anti-skid performance like cement pavement; it is convenient to construct, and the construction process has little interference with the traffic arteries. Based on the above advantages, the existing bridge pavement structure is dominated by asphalt concrete pavement. [0003] The traditional asphalt pavement surface layer is generally divided into two or three layers according to the pavement grade. The two layers are the upper layer and the lower layer, and the three layers are the upper layer, the middle layer and the lower layer. Generally, densely graded asphalt concrete is used. For the cho...

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Problems solved by technology

[0004] Each kind of asphalt mixture has its own advantages and disadvantages. If densely graded asphalt mixture is laid on the upper layer, although it has a good waterproof effect, it will be accompanied by problems such as rapid attenuation of anti-skid performance, loud noise and water drift; if using It is an open-graded asphalt mixture. Although it has good anti-skid performance and noise absorption function, it is necessary to reserve gaps and drainage paths inside the structure of the open-graded asphalt mixture. The gaps are easy to mix with debris on the road surface and damage its original effect

If open-graded asphalt mixture is used on the bridge pavement, there will be two main problems. The first problem is the above-mentioned drainage problem. In view of the defects of open-graded asphalt mixture, this scheme is used for commonly used open-graded asphalt mixture. After reflection, it is believed that the layer thickness of this gradation is the main cause of drainage defects; the second problem is that if all the graded asphalt mixture is spread out, the water inside the pavement structure will flow longitudinally at this time, causing damage to the expansion joints. Negative Effects

[0005] The traditional solution is that the entire upper layer is an asphalt concrete structure, the thickness is too large, and various fillers are easily mixed inside the upper layer. After the upper layer is dense, its various functions are greatly reduced.

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