The difference between TBM brush and shield machine

The main differences between TBM and shield tunneling machine are as follows:
Different engineering applications: TBM is mainly used for hard rock engineering, while shield tunneling machines are used for excavating soil layers.
Different structural characteristics: TBM belongs to a typical modern support type, and its structure can be divided into two parts: excavation, support, and drive combination, as well as transportation and assembly equipment. The supporting effect of the excavation face of the shield machine is generated by the cohesive force of the soil and the resistance within the range of grid thickness. As the shield machine advances, the soil is squeezed out of the grid, and the opening area of the grid is adjusted according to the properties of the soil.
Different levels of technical complexity: TBM technology is more advanced and complex than shield tunneling machine technology.
Different working environments: TBM is a hard rock tunneling machine, generally used in mountain tunnels or large-scale water diversion projects; Shield tunneling machine is a soft soil tunneling machine mainly used for urban subways and small pipelines.
Different classifications: TBMs are generally divided into open tunnel boring machines and shield tunneling machines; The classification of shield tunneling machines is more diverse, including various types such as manual excavation shield, extrusion shield, semi mechanical shield, mechanical shield, etc.
Although TBM and shield tunneling machines have these essential differences, they are both mechanical equipment for full section tunnel excavation. Different work environments require the use of different machinery to ensure construction efficiency and safety.