High-latitude high-temperature permafrost area highway raft plate-pile composite foundation and construction method

Abstract

The invention provides a high-latitude high-temperature permafrost area highway raft plate-pile composite foundation and a construction method. In the prior art, the hydration heat generated by CFG piles during construction would have a large effect on permafrost around the piles and therefore the lateral restraint would be obviously reduced after the permafrost melts, so that the bearing abilityof the CFG piles would be obviously affected. The high-latitude high-temperature permafrost area highway raft plate-pile composite foundation comprises a foundation; the foundation comprises a group of prefabrication piles (8); inter-pile soil (7) is arranged between each two adjacent prefabrication piles; the lower portions of the prefabrication piles pass through humus (3), peat soil (4) and a high-temperature permafrost layer (5) sequentially and are located on a pile foundation force holding layer (6); the tops of the prefabrication piles extend into a raft plate (1); an XPS thermal insulation plate (2) is arranged under the raft plate and a cotton-padded mattress cushion layer (12) is arranged under the XPS thermal insulation plate. The invention is applied to the high-latitude high-temperature permafrost area highway raft plate-pile composite foundation and the construction method.

Description

Technical field: [0001] The invention relates to a raft-pile composite foundation of a highway roadbed in a high-latitude and high-temperature frozen soil area and a construction method, belonging to the field of highway roadbed construction. Background technique: [0002] Permafrost in my country is mainly distributed in the Qinghai-Tibet Plateau and the Xiaoxing'an Mountains in Heilongjiang Province. Building roads in permafrost regions has always been a difficult problem faced by engineers and technicians. However, with the development of science and technology, scientific researchers and engineering technicians have deepened their knowledge and understanding of permafrost, so they have also developed permafrost regions. New methods and technologies for building highways. Nowadays, the main engineering measures used to build roads in permafrost areas at home and abroad include the construction of special forms of roadbeds, such as hot rod roadbeds, ventilation pipe foundation...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the lateral constraints of the existing CFG piles are significantly reduced after the permafrost is thawed and have a significant impact on the bearing capacity of the CFG piles, and provide a method to ensure the quality of the roadbed and ensure the safety of the permafrost areas. The quality and strength of subgrade construction

Images