A splicing structure and method for old road expansion based on drainage and anti-cracking

Abstract

The invention discloses a drainage crack resistance based old road expansion splicing structure and method, belonging to the field of road engineering. The structure and the method are characterized in that stratified milling is carried out on a structural layer of the old road from a splicing seam to the outside, and structural layer splicing steps with certain width are reserved corresponding to the pavement structure of the old road during milling; the widened spliced pavement structure adopts the alternate dense and sparse composite structure form; the asphalt surface course thickness of the widened spliced pavement structure is the same as that of the old road; the interiors of the pavement structure and subgrade of the corresponding old road are horizontally drained; a flexible asphalt treatment drainage base course with certain thickness, a semi-rigid material compaction subbase with certain thickness and a graded broken stone drainage cushion course with certain thickness are respectively arranged below a spliced asphalt surface course. Compared with the prior art, the splicing structure and the splicing method have the beneficial effects that the problems of poor drainage of the interiors of the pavement structures, sedimentation unevenness of the new and old pavement, cracking along the splicing seams and the like in the traditional methods are solved, and the overall service lives of the new and old pavement structures are long after splicing; therefore, the structure and the method have good popularization and application values.

Description

technical field [0001] The invention relates to the field of road engineering, in particular to an old road extension splicing structure and method based on drainage and anti-cracking. Background technique [0002] With the rapid economic development and the rapid growth of highway traffic volume, the original highway traffic capacity cannot meet the needs of the society, so it is necessary to widen and rebuild. The splicing of the pavement is the biggest difficulty in the current reconstruction and expansion project, and it is also the key to quality control. The traditional pavement splicing method uses the same pavement structure as the old road, without considering the internal drainage of the old road structure and the deformation coordination of the new and old roads. [0003] More than 90% of the active asphalt pavement in my country is semi-rigid base pavement structure. The advantage of this pavement structure is that the semi-rigid material has high rigidity and g...

AI Technical Summary

Problems solved by technology

When using the traditional splicing method, because the newly paved semi-rigid material is very dense, it blocks the channel for the water to seep out of the old road structure, and the water that seeps into the structure is difficult to discharge, and the pavement structure appears quickly under the repeated action of driving load or freeze-thaw Cracking, pumping, looseness and pits and other diseases, especially at the joints are more prone to cracking and pumping diseases, which have a serious impact on driving safety

In addition, since the modulus of the semi-rigid base of the old road has been greatly attenuated, it is very different from the modulus of the semi-rigid base of the new road. If the same structure is adopted, it will inevitably cause deflection and settlement unevenness, cracks at the joints and a series of resulting problems. Derived diseases are inevitable

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