Construction method of bagged rammed small-diameter soil-cement pile composite foundation

Abstract

The invention relates to a construction method of a bagged rammed small-diameter soil-cement pile composite foundation in a small-area weak and deep soft soil layer. The construction method is characterized in that a small-diameter soil engineering pipe bag is combined with the traditional soil-cement pile processing method to extrude surrounding soil bodies to be dense in a limiting way by utilizing the gluing reinforcement of cement and the restraint action of the soil engineering pipe bag so as to form high-density minitype pile group effect and enhance the bearing capability of the foundation. The diameter of the traditional soil-cement pile and the loss of soil-cement in the foundation are reduced by utilizing the packaging and restricting action of the soil engineering pipe bag, and the embedment depth of a pile body is reduced, thereby the reinforcement effect of a shallow-layer weak field soil composite foundation is achieved. Compared with construction method of the soil-cement pile large-area soft soil foundation, the invention has the advantages of simple process, fast construction, miniaturized construction equipment, material saving and low cost and can be popularized and used in the processing process of a small-area deep and weak field soil foundation.

Description

Technical field [0001] The invention relates to a shallow composite foundation treatment method, in particular to a bag-packed compacted small-diameter cement-soil pile composite foundation construction method for treating deep, thick and weak soil foundations, and belongs to the technical field of geotechnical engineering. Background technique [0002] Due to the soft soil foundation has high natural water content, large void ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, poor water permeability, complex layered distribution of soil layers, and physical and mechanical properties between layers. Due to the characteristics of large differences, the bearing capacity of the foundation is generally very low, and the overall stability is poor. Therefore, when using such weak foundations, appropriate foundation treatment methods must be adopted in engineering. At present, the most important treatment method for soft soil ...

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Problems solved by technology

According to the characteristics of the soft soil foundation in small sites, the large-scale soft foundation treatment method cannot fully meet the requirements, and the pile body is too deep into the soil (generally penetrates through the soft soil layer), the pile diameter is large (600-1000mm), and the construction machinery is heavy to enter the site Difficult, complex construction technology, relatively high cost and other weaknesses, so for the composite foundation reinforcement treatment of the soft foundation of small sites, the existing composite foundation construction methods have certain disadvantages

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