Caissons are essential structures used in pipe jacking operations to facilitate the installation of pipes beneath obstacles such as roads, railways, or water bodies without the need for open trench excavation. These watertight retaining structures are typically made of reinforced concrete and are designed to withstand high lateral earth pressures and groundwater forces. In pipe jacking, the caisson serves as a launch or reception shaft, providing a stable and secure environment from which jacking equipment can operate. The process involves excavating soil within the caisson, incrementally lowering it into the ground as excavation progresses, and maintaining structural integrity to prevent soil collapse. By housing the jacking machinery and guiding the pipe sections into place, caissons play a critical role in ensuring the precision, safety, and efficiency of pipe jacking projects.