The pipe curtain method is commonly used in tunnel engineering that requires strict control of settlement when undercrossing expressway. Since the pipe curtain construction will cause the ground loss and subsequent surface settlement, the construction process and precision control of long-distance pipe curtain have become the key technologies in the construction of sand-layered multi-arch tunnels undercrossing expressway. Taking a multi-arch tunnel project undercrossing expressway as the background, the overall design scheme of the long-distance pipe curtain method, the construction technology of the pipe curtain, the jacking construction, the precision control and the correction methods are set forth in detail. The numerical simulation calculations are performed to analyze the settlement and deformation of the ramp during the construction of the multi-arch tunnel using the pipe curtain method. The results indicate that the long-distance pipe curtain method can effectively control the settlement and deformation of the expressway subgrade, and can provide the guarantee for tunnel construction, operational safety, and the normal operation of existing roads.