Today, with shorter tunnels in urban areas or smaller underground structures, most construction projects use cutting coverage. This approach has several drawbacks, such as disruption of traffic and the need for a wide range of additional measures to stabilize surrounding buildings, emit dust and noise. In order to reduce these side effects of construction activities, the application of rectangle pipe jacking machine excavation was developed. Small launches and wells that are common in traditional piped pipe jacking must be excavated and can usually be dug without shutting down traffic.
In the 70 's, rectangular top tubes were first developed and successfully applied in Tokyo underground. After several years of research and development,rectangle pipe jacking machine construction technology with a width of more than 6 meters and a height of more than 3 meters is very popular in Asia. At present, rectangular top tube is suitable for a series of soil layer and weak rock layer, using soil pressure equilibrium excavation mode.