Shallow sea long-distance submarine pipeline tension-free laying construction technology

The invention relates to a shallow sea long-distance submarine pipeline tension-free laying construction technology. Firstly, submarine finished short steel pipes are hoisted on a pipe-laying vessel, then the submarine finished short steel pipes are welded one by one, and the pipe-laying vessel adopts an tension-free pipe-laying method through a pipe supporting frame, arranges the steel pipes into water from the tail of the vessel and lays the steel pipes on a seabed. Before the pipes are laid, the pipe-laying vessel is positioned, drops an anchor, then starts a main traction anchor and a deviation-correcting anchor machine, and adjusts the pipe-laying angle and posture of the pipe supporting frame according to the water depth conditions. According to the shallow sea long-distance submarine pipeline tension-free laying construction technology, a submarine pipeline made of common steel serves as a water conveying pipeline, so that construction cost is largely reduced on the premise that the construction safety is guaranteed. The shallow sea long-distance submarine pipeline tension-free laying construction technology is a beneficial pioneering work in the submarine pipeline laying construction, has a wide market in the field of submarine pipeline construction, and has large economical benefits and social benefits. The pipeline is laid under the sea, and does not damage and affect the sea environment.