What are the methods of gas pipeline excavation? What about trenchless? What are the advantages and disadvantages? Come on, everybody, 3Q.

There is only one way to dig, which is to dig trenches and lay pipelines. Advantages: low cost, simple operation, trenchless: pipe jacking and directional drilling. . . Modern trenchless pipe laying technology refers to a new construction technology to lay, replace or repair various underground pipelines by geotechnical guidance and directional drilling without digging trenches on the surface. This technology has remarkable social and economic benefits, especially in laying pipelines in some areas where excavation is impossible, such as crossing roads, railways, buildings, rivers, historic sites protection areas, downtown areas, crop and vegetation protection areas, etc. This technology has been widely used in gas, telecommunications and power engineering departments. Modern trenchless underground pipeline construction methods have appeared in large numbers since 1970s, including: horizontal directional drilling, horizontal directional drilling, horizontal spiral drilling with controllable direction, impact spear, pipe rammer, tunnel-by-tunnel micro-tunnel, old pipeline replacement and repair, pipe jacking machine and so on. Trenchless technology not only reduces road excavation and construction cost, but also solves some problems that traditional excavation can't be constructed, and repairs old pipelines and projects with high installation difficulty. Large-scale pipe network laying in west-to-east gas transmission and Guangdong LNG project; Natural gas is widely used as a clean and environmentally friendly energy source, which makes it in natural gas replacement projects; In order to ensure that the gas supply to customers will not be greatly interrupted, when installing partition pressure regulating valves and pipelines; After the completion of the ring pipe network, if it is necessary to update the old gas pipeline, it will play a considerable advantage. Trenchless technology replaces civil construction (trench-digging buried pipe method), which is not only another leap in gas construction technology, but also reflects the rapid development of construction technology and scientific and technological modernization.