High fill area end bearing pile foundation construction method

Abstract

The invention relates to the technical field of civil engineering, in particular to a high fill area end bearing pile foundation construction method which comprises the steps of construction preparation, surface layer backfill soil excavation, first layer dynamic compaction foundation layer construction, soil paving and rolling compaction, second layer dynamic compaction foundation layer construction, compaction backfill foundation treatment, bearing capacity detection, rigid pile paying-off positioning and drilling. According to the construction method for the end bearing pile foundation of the high fill area, the negative friction resistance of backfill soil on the pile side is reduced, it is guaranteed that the pile and the soil are jointly stressed, and the construction efficiency of the end bearing pile foundation of the high fill area is improved. After the foundation which is not suitable for building a high-rise building originally is treated, the requirement for the bearing capacity of the designed foundation can be met, the land utilization rate is greatly increased, the land cost is saved, and compared with an existing replacement filling method for compacting the foundation, construction is fast, economical efficiency is good, and social and economic benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a construction method for end-bearing pile foundations in high filling areas, which is suitable for backfilling end-bearing pile foundations in high filling areas with a thickness of more than 20 meters. Background technique [0002] In the valleys and low-lying areas around many cities in our country, due to the needs of previous development, there are many urban construction waste and spoil areas. Considering the impact of the project cost at that time, the backfill standard is low, and most of them are simple accumulation. Due to the needs of development, in order to make full use of land resources, more and more former urban landfills are used for construction land, even high-rise building land. In this way, the backfill standard in the early stage is low, and the soil layer whose accumulation period does not meet the consolidation requirements will inevitably bring...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of the difficulty of directly drilling holes after surface compaction and the large negative friction resistance in the current construction of end-bearing pile foundations in high fill areas. The treatment method is to maximize the compaction of the backfill soil, increase the degree of consolidation of the soil, and reduce the defects of hole collapse

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