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Home > KOSUN News >
Introduction to trenchless horizontal directional drilling
Dec 10, 2024
Trenchless horizontal directional drilling (hereinafter referred to as HDD) first appeared in the 1970s, began to be introduced into China in the late 1980s,
and developed rapidly in China at the beginning of the 21st century, widely used in the construction of electricity, telecommunications, water supply, gas, sewage, etc.,
for the road, railway, river, hillside and other pipelines. The reason why trenchless can develop so quickly into a new industry,
it has its own advantages: safety, speed, quality and so on. As a new industry, if we want to go further and longer, we must standardize, so sorting out and writing specifications is the focus of our work in the future.
Trenchless processes: ① survey →② mechanical and personnel approach →③ excavation into drilling →④ guided crossing →⑤ excavation into drilling →⑥ back expansion →⑦ welded pipe →⑧ pipe drag out →⑨ cleaning the site →⑩ mechanical exit. All processes do not mention the use of mud, but it is like human blood, silently running through the entire most important links.
People die without blood, and no excavation without mud is doomed to failure. There are ten trenchless processes: survey, approach, excavation into drilling, guided crossing, excavation out drilling, back expansion and welding pipe, hauling out, cleaning the site, and exit. Of these ten processes, three are the most important: guided crossing, backspreading, and pulling out.
The engineers say the guided crossing is halfway through. But I think the key to a successful crossing depends on whether our hero behind the scenes, the mud, is applied correctly.
