Discontinuous combined pile for reinforcing hard soil interlayer-containing soft soil foundation and construction method of discontinuous combined pile

Abstract

The invention discloses a discontinuous combined pile for reinforcing a hard soil interlayer-containing soft soil foundation, wherein pile bodies in the foundation are discontinuous; the pile bodies are arranged in soft soil layers but are not arranged in hard soil layers; the pile bodies at the junctions of the soft soil layers and the hard soil layers are provided with expansion heads; the pile bodies are constructed by using a high-pressure rotary jet grouting process or a soil cement stirring process; and automatic control is performed in a pile forming process by using a computer program. The invention also discloses a construction method of the pile. The construction method comprises the following steps of: arranging a static sounding probe device below a pile driver; probing lateral resistance and end resistance of soil layers by using a probe to determine the property of the soil layers; transmitting a result to a program for controlling pile foundation construction; judging whether to construct a mixing pile or a high-pressure rotary jet grouting pile by the program; grouting to form the pile if the soil is soft soil; not grouting if the soil is hard soil; and constructing the expansion heads at the junctions of the soft soil layers and the hard soil layers so as to form the discontinuous combined pile form. The discontinuous combined pile is convenient to construct, is material-saving, can be suitable for soil layers of different properties and is an economical and high-efficiency high-grade pile form for treating the soft soil foundation.

Description

technical field [0001] The invention belongs to the technical field of soft soil foundation treatment and pile foundation, and in particular relates to an intermittent combined pile and a construction method for reinforcing soft soil foundation with hard soil layers. Background technique [0002] The composite foundation of mixing pile and high-pressure rotary grouting pile is an effective form of soft foundation treatment. During construction, cement slurry is sprayed into the soil by using a mixing pile machine or a high-pressure rotating nozzle, so that a series of physical and chemical reactions between cement and soil occur, making the soft soil This method has the characteristics of simple construction, low cost, fast speed, and remarkable effect, and has been widely used in engineering circles. However, due to the complexity of geological processes and the variability of depositional environments, even the soil layers on the same site may have very different mechanica...

AI Technical Summary

Problems solved by technology

However, after the static sounding test has obtained the data, it often needs to be brought back to the room for post-processing to obtain the soil layer distribution, and the automatic judgment of the soil layer distribution cannot be carried out on site, and the pile foundation construction is carried out after the static sounding sounding, and the two cannot be carried out at the same time , so the construction energy consumption is wasted, and the process is complicated

Images