Construction method for widening and ribbing heavy-thickness sub-base of cold-plateau highway

Abstract

The invention relates to a construction method for widening and ribbing a heavy-thickness sub-base of a cold-plateau highway. Firstly milling is conducted on an old road base and an old road sub-base, then roadbed padding at the seam of an old road roadbed and a new road roadbed is solidified to form a roadbed seam hardened zone; then a layer of bed base reinforcing mesh is laid along the top surfaces of the old road roadbed and the new road roadbed, and a corner-part anchor-connection rib and a seam dowel bar are implanted to the vertical seam of a new road sub-base and the old road sub-base; then paving, laminating and maintaining construction of the new road sub-base are conducted; and after the new road sub-base forms strength, seam seam-body-pouring construction and seam-board-separating construction are sequentially conducted, post-grouting is conducted on the new road sub-base of a road shoulder part through a post-grouting pipe to form a base slurry-solidifying zone, and finally construction of a roof water-resisting layer and roof reinforcing mesh is conducted. According to the construction method for widening and ribbing the heavy-thickness sub-base of the cold-plateau highway, not only can the differential deformation at the seam of the new road base and the old road base be controlled, but also the heavy-thickness sub-base can be prevented from generating cracking disease, and the problem that the degree of compaction on the road shoulder part is not sufficient can further be solved.

Description

technical field [0001] The invention relates to a construction method for widening and reinforcing large-thickness subbases in high cold areas, which can effectively enhance the integrity of spliced ​​and widened subbases in high cold areas, control the temperature shrinkage and deformation of subbases, and prevent frost heave damage. It belongs to the field of road engineering and is suitable for the renovation project of flexible base asphalt pavement of high-grade highways and urban arterial roads. Background technique [0002] With the rapid development of my country's economy, many original roads can no longer meet the growing demand for vehicle traffic, and road widening has become the mainstream of road construction in my country at this stage. Considering that the cement-stabilized macadam base has the characteristics of high strength, high rigidity, good integrity and simple construction technology, it has been widely used in the subbase and base construction of sem...

AI Technical Summary

Problems solved by technology

Some analysis found that although the existing highway widening subbase structure and construction methods have achieved relatively ideal construction quality under suitable engineering environmental conditions, there is still room for improvement in the bearing capacity of the roadbed for the widening of large thickness subbase projects in alpine regions , Strengthening of joint connection strength, improvement of structural integrity, effective control of temperature shrinkage and drying shrinkage deformation and other engineering problems need to be solved

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