Roadbed structure applied to road widening and construction method

Abstract

The invention relates to a road building structure and a construction method field. A roadbed structure applied to road widening comprises a new road layer, a filling material layer, a broken stone cushion layer, a concrete retaining wall and an original roadbed slope, wherein the original roadbed slope is finished as a step shape; the concrete retaining wall is arranged on the reciprocal nth step of the step-shaped roadbed slope; the surface of the reciprocal n-1th step of the step-shaped roadbed slope is an inclined surface; the broken stone cushion layer is laid on the surface of the bottom layer of the step-shaped roadbed slope; the filling material layer and the new road layer are arranged at the upper part of the broken stone cushion layer in sequence; and the filling material layer is prepared by cement, silicon fume powder, kieselguhr, expanded perlite, water, a water reducing agent, rubber powder, planet fibers, a foaming agent and a micro foam agent. The roadbed structure can be applied to the road widening, can perform the vertical filling to save the land and to reduce the demolition, can largely reduce the filling load to reduce the differential settlement of new and old roadbeds in soft-foundation road sections, and is short in construction period.

Description

technical field [0001] The invention relates to a road building structure and a construction method, in particular to a roadbed structure and a construction method for road widening. Background technique [0002] With the increasing economic development and traffic volume, many highways in our country need to be widened. Road widening can make it easier for people to travel and reduce traffic pressure, but the construction technology, effect and problems of existing road widening are worth exploring. [0003] At present, after the completion of the road widening and reconstruction project, many pavements often have longitudinal and transverse cracks and other diseases. The reasons for the above problems mainly include: 1) The material of the subgrade and the thickness and strength of the pavement structure layer at the junction of the old and new subgrades after widening treatment are different, In particular, the quality of the new subgrade is different from that of the or...

AI Technical Summary

Problems solved by technology

Road widening can make it easier for people to travel and reduce traffic pressure, but the construction technology, effect and problems of existing road widening are worth exploring

[0003] At present, after the completion of the road widening and reconstruction project, many pavements often have longitudinal and transverse cracks and other diseases. The reasons for the above problems mainly include: 1) The material of the subgrade and the thickness and strength of the pavement structure layer at the junction of the old and new subgrades after widening treatment are different, In particular, the quality of the new subgrade is different from that of the original old subgrade, and a critical surface is formed at the junction, which leaves hidden dangers for road cracking; 2) After the new and old subgrades are widened, the settlement at the junction is not First, there is a certain settlement difference, especially the newly widened roadbed has a large post-construction settlement, while the old roadbed has completed a considerable amount of post-construction settlement, so it is inevitable to produce a sudden change in the settlement difference at the joint site, which becomes the road The main reason for the cracks; 3) The technology of the junction of the new and old subgrades is more complicated, and the construction is more difficult, and there are often artificial quality factors here, such as the compactness does not meet the design standards, etc.

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