Construction method of combined pile foundation for reinforcing prestressed pipe pile

Abstract

The invention discloses a construction method of a combined pile foundation for reinforcing a prestressed pipe pile. The construction method comprises the following steps that A1, firstly, the prestressed pipe pile (6) is constructed; A2, a steel pipe pile (7) is driven into the outer side of the prestressed pipe pile (6), the pile end of the steel pipe pile (7) extends into a bearing stratum soil body (4), and micro-expansive type polymer cement paste is injected to a position between the steel pipe pile (7) and the prestressed pipe pile (6) through two steel grouting floral tubes (10); A3, finally, soil in the prestressed pipe pile (6) is removed, a supporting plate (9) is placed, then a reinforcement cage (8) is put in, and fine aggregate concrete (15) is filled for pouring; and A4, then a garbage landfill layer (3) is leveled, a plain concrete cushion layer (2) is laid, finally, an upper structure foundation (1) is constructed on the plain concrete cushion layer (2), and the top end of the prestressed pipe pile (6) and the top end of the steel pipe pile (7) are anchored into the upper structure foundation (1). Therefore, the combined pile foundation is formed, and the purposes of improving compression resistance, shear resistance and stability are achieved.

Description

technical field [0001] The invention relates to a construction method for reinforcing a combined pile foundation of prestressed pipe piles, which is suitable for the reinforcement method of prestressed pipe piles in construction projects or pile foundations in composite foundations. Background technique [0002] With the development of cities, the demand for construction land is also increasing, and some foundations with poor geological conditions are gradually being paid attention to, especially deep construction waste or domestic waste landfill sites. The composition of the waste landfill site is different, the size of the particles is different, the size of the pores between the particles is different, and the compressibility is high. The soil replacement method or grouting reinforcement method is often used for foundation treatment, but when the foundation treatment area is large and the treatment depth varies greatly, the cost of foundation treatment is too high and the...

AI Technical Summary

Problems solved by technology

The soil replacement method or grouting reinforcement method is often used for foundation treatment, but when the foundation treatment area is large and the treatment depth varies greatly, the cost of foundation treatment is too high and the construction period is too long.

When pile foundations or composite foundations are used for pile foundation treatment, negative friction resistance is likely to occur in the soil layer formed in the landfill site, resulting in insufficient bearing capacity.

Images