Concrete foundation-free highway culvert for permafrost region

Abstract

The invention discloses a concrete foundation-free highway culvert for a permafrost region. The culvert is characterized by comprising a graded gravel foundation, a steel corrugated pipe and a natural gravel backfill layer, wherein the graded gravel foundation with a certain thickness is laid on a design substrate; steel corrugated pipe sections are arranged on the graded gravel foundation, and are connected through flanges and strong-strength bolts; a gap between every two adjacent pipe sections is sealed by an asbestos pad; the inner and outer surfaces of the culvert pipe are coated with asphalt; after the culvert pipe is firmly arranged, natural gravel is synchronously and symmetrically backfilled and compacted on the two sides of the pipe culvert in a layered way; the steel corrugated pipe is made from Q235-A, pipe section flanges are arranged at the two ends of the steel corrugated pipe, the wall of the steel corrugated pipe is 3 to 6mm thick, and the surface of the steel corrugated pipe is galvanized in a hot-dipping way. The culvert has the advantages of convenience in construction, low labor intensity, high construction speed, lower construction cost, high deformation resistance and slight freezing influence, the safety and the durability of the culvert can be effectively ensured, the problem of non-uniform sedimentation of a culvert and a foundation in the permafrost region is improved, and the post-maintenance cost is reduced.

Description

technical field [0001] The invention relates to the construction technology of highway culverts in frozen soil regions, in particular to a concrete-free foundation culvert for highways in frozen soil regions. It is especially suitable for road culvert engineering in permafrost areas. Background technique [0002] The permafrost region contains ice under the surface of the permafrost. In winter, the temperature is generally low, and the soil layer freezes; in summer, the soil layer absorbs solar radiation to generate heat, and the soil layer thaws. As the temperature in the permafrost region changes positively and negatively periodically, the permafrost layer deforms, causing frost heave and thawing. Therefore, the construction of reinforced concrete culverts and foundations in permafrost regions will cause frozen concrete culverts and concrete foundations Expansion, uneven subsidence, cracking, tilting, water leakage and other damages require manpower, material and financia...

AI Technical Summary

Problems solved by technology

Provide a method that can effectively ensure the safety and durability of culvert engineering, can effectively improve the problem of uneven settlement of culverts and foundations in permafrost regions and reduce post-construction maintenance costs, and has simple construction, low labor intensity, fast construction speed, and low project cost. Strong resistance to deformation, less affected by freezing

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