Single-side joint structure and single-side joint method for expressway extension

Abstract

The invention discloses a single-side joint structure and a single-side joint method for expressway extension. The structure includes, from top to bottom successively, an upper surface layer, a middle surface layer, a lower surface layer, a cold regeneration basic layer, a water stability sub-base layer, and a cushion layer. The water stability sub-base has a double-layer composite structure and comprises an upper water stability sub-base layer and a lower water stability sub-base layer. At a joint position, the joint structure has step-like arrangement. In the method, an original medium separation area is removed and the pavement of a to-be-extended half side of the old road until the cushion layer is milled and planed. The two-direction slope of the old road is modified into a one-direction slope to ensure the top surfaces of the two water stability sub-base layers in the old road to be one-directional, thereby effectively enabling a drainage system on the surface of the pavement and inside the pavement to be unobstructed. Two basic layers of the old road are jointed to each other in a semi-rigid manner, so that by means of the method, the deformation of the two basic layers are cooperated, thus prolonging the service life of the pavement. The structure and the method improve anti-reflective crack capability of the pavement structure, wherein the joint seam is arranged at the lane line between a second lane and a third lane. A warp-knitted composite reinforced anti-cracking fabric is employed so as to avoid a load concentration position of wheel track tapes and avoid a large load on the weak positions in the joint seams, thereby improving durability of the pavement structure.

Description

technical field [0001] The invention relates to an expressway extension structure, in particular to a single-side splicing structure and method for expressway extension. Background technique [0002] With the continuous growth of traffic volume, the completed expressways are difficult to meet the travel needs of the public, and the reconstruction and expansion of expressways has become the development trend of highway engineering construction. Pavement splicing is a major difficulty in the reconstruction and expansion project. However, after the removal of the original central divider, unilateral splicing has technical problems such as difficult slope adjustment and difficulty in leveling the top surface of the base. Inter-width deformation is difficult to coordinate. [0003] In addition, at present, most of the asphalt pavement of expressways in my country adopts semi-rigid base pavement structure. This kind of pavement has the problem of rigid and flexible splicing durin...

AI Technical Summary

Problems solved by technology

Pavement splicing is a major difficulty in the reconstruction and expansion project. However, after the removal of the original central divider, unilateral splicing has technical problems such as difficult slope adjustment and difficulty in leveling the top surface of the base. Inter-web deformation is difficult to coordinate

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