A Treatment Structure for the Joint Section of Expressway Reconstruction and Expansion Project

Abstract

The invention discloses a treatment structure at a joint part of a reconstruction and extrusion project of a highway. A step (6) is excavated at a roadbed joint part between an old road embankment (10) and a new roadbed (7) for splicing with the new roadbed (7), a geogrid (5) is laid on the step (6), a CFG (cement fly-ash gravel) pile (8) is arranged at the roadbed joint part between the old road embankment (10) and the new roadbed (7), a longitudinal beam (9) is arranged on the CFG pile (8), and a steel wire mesh is laid on a pavement joint part between the old road embankment (10) and the new roadbed (7) of a new pavement (4). The combination of the CFG pile (8) and the longitudinal beam (9) can improve the bearing force at the joint part between the new and the old roadbeds and reduce sedimentation; and the combination of the geogrid (5) and the double-twisted steel wire mesh (3) reinforcement pavement technology can enhance the transverse relation between the new roadbed and the old roadbed, eliminate the non-uniform sedimentation of the new and the old roadbeds and reduce the total sedimentation.

Description

technical field [0001] The invention relates to a treatment structure for a joint part of a highway reconstruction and expansion project, in particular to a treatment structure for a joint part of a highway reconstruction and expansion project. Background technique [0002] The construction of new embankments in expressway reconstruction and expansion projects will lead to new differential settlements of the old embankments, and settlement deformation between the new and old embankments, resulting in embankment cracking, pavement damage and other diseases. Among them, the treatment measures for the junction of the old and new embankments Improperness is one of the main reasons for differential settlement of subgrade widening. The junction of old and new embankments and pavement is the weakest part of the reconstruction and expansion project, and subgrade diseases are most likely to occur. Usually, engineering and technical measures such as excavation of old road embankment s...

AI Technical Summary

Problems solved by technology

These technical measures are all aimed at the differential settlement of the junction of old and new embankments, but there are few technical measures for the differential settlement of the junction of new and old road surfaces. Finding a treatment technology for the junction of new and old embankments and pavements in expressway reconstruction and expansion projects will reduce the number of old and new embankments. While the differential settlement of the embankment is reduced, the differential settlement of the old and new road surfaces can be reduced, which can reduce the settlement deformation of the old and new embankments, and the disease of the old and new road surfaces, which is of great significance to the reconstruction and expansion project of the expressway

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