Abstract: In recent years, the scale of foundation pit construction in China has expanded unprecedentedly, resulting in substantial material consumption and significant waste generation. A major challenge in the field of pit engineering is finding ways to reduce costs and minimize resource wastage. As an efficient support method, construction piles have seen significant development and have been extensively used in shallow pit projects. This paper proposes a new technique, Prestressed Mixing Wall (PMW) technology, which uses cured residue to form piles and inserts prestressed shaped steel to enhance resistance to deformation. Indoor loading experiments are conducted to investigate the deformation and internal force behavior of this new technology. Theoretical formulas are derived, and field applications validate the technology's effectiveness. The results show that as prestress increases, the deformation of the shaped steel in the direction of the applied force decreases significantly, even achieving "zero" deformation. Furthermore, the axial force of prestressed steel strand remains unaffected by prestress. Field applications demonstrate that PMW technology offers strong deformation control capabilities, reduces or eliminates the need for additional support, mitigates the disposal of engineering residue, significantly lowers project costs and construction durations, and provides low-carbon, environmentally friendly benefits. This technology has promising potential for widespread application.