Cement-soil composite pile inserted into reinforced concrete core materials

Abstract

The invention relates to a cement-soil composite pile inserted into reinforced concrete core materials. The cement-soil composite pile is a novel composite pile which is formed by inserting a prestressed concrete tubular pile or a prestressed concrete square pile or a reinforced concrete member, serving as a core material, into a deeply-stirred cement-soil pile (which is formed by deeply stirring through a single-shaft, double-shaft or three-shaft stirring pile machine). The cement-soil composite pile consists of a cement-soil stirring pile and a high-strength core pile. The cement-soil composite pile is formed by the following steps of: stirring soil and cement slurry to form the cement-soil by using the single-shaft, double-shaft or three-shaft stirring pile machine; and then inserting one (or a plurality of) core material (such as the prestressed concrete tubular pile, the prestressed concrete square pile, the precast reinforced concrete member and the like) into the cement-soil by a vibration or self-weight method to obtain the composite pile body. The composite pile has higher bending strength, tensile strength and shear strength so as to meet different bearing requirements, and has the lateral bearing capacity 30 percent higher than that of the core pile and comprehensive cost 40 percent lower than that of a bored pile.

Description

1. Technical field [0001] The invention relates to the reinforcement and support technology for weak rock and soil in geotechnical engineering. By inserting high-strength pile materials into the cement-soil mixing body to form a combined pile body, the reinforcement and support capabilities of the composite pile body will be greatly improved, and the engineering cost can be effectively reduced. 2. Technical Background [0002] In the engineering construction in my country's coastal and riverside areas, there are generally characteristics of weak foundation soil, poor stability, and low bearing capacity, especially in areas with rapid economic development, the cost used for foundation treatment and foundation pit enclosure , more than 100 billion yuan per year. At present, in my country's foundation treatment and foundation pit enclosure engineering, the technologies used mainly include: vibration or static pressure pile sinking, bored pile, rammed pile, cement-soil mixing pil...

AI Technical Summary

Problems solved by technology

At present, in my country's foundation treatment and foundation pit enclosure engineering, the technologies used mainly include: vibration or static pressure pile sinking, bored pile, rammed pile, cement-soil mixing pile or high-pressure jet grouting pile, etc. These construction techniques There are often many defects and are limited by engineering geology and construction environment. For example, it is difficult for static pressure piles to penetrate when encountering silt layer or silt layer, the processing depth of deep mixing piles is limited, and static pressure piles have requirements for the working site conditions. If it is too high, the vibrating sinking pile will cause noise pollution, the drilled cast-in-place pile will produce mud discharge pollution, and the rammed and expanded pile will cause vibration (vibration) to disturb the people.

Due to the low strength of the deep mixing pile itself, it is often only used as a water-stop curtain instead of a single load-bearing pile, which often causes difficulties in design and construction and greatly increases construction costs

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