Pipe jacking construction is utlizing the jacking equipment to push the equipment pipe and boring machine through the earth from the working well to the reach well. The excavation system equipped in the head constantly cut the soil, and the cuttings is discard through the circulation system. The pipes pushed advance by jacking while the cuttings discards. Laser guiding system is used to adjust the pipe direction while jacking.
Pipe jacking construction is a kind of underground pipeline construction method developed after shield boring construction, which does not require excavation of the surface layer. Moreover, it can cross roads, railways, rivers, ground buildings, underground structures and various underground pipelines.
Pipe jacking construction use the thrust between the main top oil cylinder and the inter-pipe trunk, the equipment pipe or boring system is pushed from the working well through the soil layer to the reach well.In the meantime, the pipes following the equipment pipe or boring system is also buried between the two wells,the construction of laying the underground pipe without digging is realized.
There are three primary types of equilibrium theory in pipe jacking: air pressure balance, mud balance and earth pressure balance theory. The most prominent challange of Pipe jacking construction is adaptive problems. The selection of suitable pipe jacking construction methods according to different geological, construction conditions and design requirements, as well as correctly select the pipe jacking machine and auxiliary equipment, is very crucial for pipe jacking.
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