The surrounding environment of newly built underground spaces is becoming increasingly complex, and foundation pit excavation is often affected by existing buildings, municipal infrastructure, andproperty line boundaries. For complex surrounding environments, conventional support methods each have their own limitations. To address these issues, CABR Foundation Engineering has developed a new type of prestressed concrete cantilever pile support structure that can limit the displacement of the support structure.

The prestressed concrete cantilever pile support structure does not require internal bracing that would interfere with earthwork excavation and structural construction, nor does it requireanchor rodsthat would affect the surrounding environment of the foundation pit or encroach on space beyond the property line. Instead, steel strands are embedded in the support structure and prestress is applied to them in stages, creating a deformation tendency toward the outside of the foundation pit. After excavation, thehorizontal displacementof the support structure can be controlled within the allowable range, and the bending and shear capacity of the pile body is greatly improved. Compared with ordinary cantilever structures, the support depth is significantly increased. With the prestressed concrete cantilever support structure, the foundation pit earthwork can be excavated directly to the pit bottom without affecting the construction of the main structure. Compared with pile-anchor and internal bracing schemes, it can save construction time and has a lower overall cost.

The prestressed concrete cantilever pile support structure can be used for foundation pit support projects in situations where anchor rods cannot be installed, the schedule is tight, the area is large, or construction space within the property line is limited. It is especially suitable for strata that can provide a good embedment effect.