Structure for repairing urban bituminous pavements and construction method thereof

Abstract

The invention belongs to the technical field of urban bituminous pavement repairing, and discloses a structure for repairing urban bituminous pavements and a construction method thereof. The structure comprises a bituminous pavement layer, a base layer, an upper layer high-strength geogrid, a geocell reinforcement layer filled with old bituminous pavement mixed aggregates, a lower layer high-strength geogrid, a waterproof layer and roadbed from top to bottom. According to the structure for repairing urban bituminous pavements and the construction method thereof, prior old bituminous pavement materials are fully used, and cross impacts of rainfall and ground water on the roadbed and the bituminous pavement are segregated effectively. Simultaneously, by means of a combined reinforcement structure of the upper layer and the lower layer high-strength geogrids and the geocell reinforcement layer, the anti-deformation capacity of the bituminous pavement structure can be improved effectively, cracking and deformation of the bituminous pavement structure are restricted, and the service life of the bituminous pavement is increased. Particularly, when local bad foundation exists in the roadbed, the 'girder effect' formed by the combined reinforcement structure can effectively transmit loads on the local bad foundation to around foundation, and secondary damages to a novel paved bituminous pavement structure are avoided.

Description

technical field [0001] The invention belongs to the technical field of urban asphalt pavement repair, and in particular relates to an urban asphalt pavement repair structure with local bad foundations in the roadbed and a construction method thereof. Background technique [0002] Urban asphalt pavement is one of the main forms of urban road pavement in my country. It has the advantages of high surface smoothness, comfortable driving process, small vibration and low noise. However, as an overall structural layer, asphalt pavement is greatly affected by roadbed strength, traffic load and various environmental factors. Various diseases such as network cracks, subsidence, uneven settlement, and flatness decline will occur during use, which is serious. Affect traffic safety and driving quality. When the pavement is damaged to a certain extent, it is necessary to repair the pavement as a whole or in part. [0003] As urban roads are limited by the elevation of the road surface, ...

AI Technical Summary

Problems solved by technology

However, the old asphalt pavement of this method needs a lot of cost to be broken, transported and discarded. At the same time, the abandonment of the old asphalt pavement will cause serious damage to the surrounding environment of the city.

In addition, the local damage of urban asphalt pavement is often caused by the existence of local bad foundations under the asphalt pavement. If only the asphalt pavement is repaired and the local bad foundation is not treated, this can only "cure the symptoms" and not "cure the root cause".

Under the action of traffic load, the subgrade is easy to subside again, causing the asphalt pavement structure to be damaged

However, if the local bad ground is treated before the asphalt pavement renovation (currently, the replacement method, grouting method and cement mixing pile method are mainly used), it will also bring many problems

Firstly, the cost of foundation treatment is too high, which can account for more than half of the cost of asphalt pavement renovation; secondly, a large mechanical construction platform is required for foundation treatment, and sometimes even the entire road section needs to be closed, which seriously affects the smoothness of urban traffic; thirdly, the foundation The noise and dust caused by the disposal have seriously affected the quality of life of the citizens around the construction section; finally, the excavation, transportation, disposal of a large amount of old foundation soil generated by the replacement method, and the purchase, transportation, and filling of new filling materials also require A lot of cost, while the grouting method and the cement mixing pile method not only waste resources, but also cause serious pollution to the original roadbed, which has a great impact on the urban environment

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