The invention provides a prefabricated directly-buried heat preservation
pipe and a using method thereof, and belongs to the technical field of heat preservation pipes, the prefabricated directly-buried heat preservation
pipe comprises a first connecting
pipe, a first heat preservation layer is fixedly connected to the first connecting pipe, a first inner pipe is fixedly connected to the first heat preservation layer, a
butt joint groove is formed in the first heat preservation layer, and a
butt joint block is installed in the
butt joint groove; a butt joint block is fixedly connected to the first heat preservation layer, a second heat preservation layer is fixedly connected to the butt joint block, a second inner pipe and a second connecting pipe are fixedly connected to the inner side and the outer side of the second heat preservation layer respectively, a first connecting block is fixedly connected to the first heat preservation layer, and a first mounting groove used for being in butt joint with the first connecting block is formed in the second heat preservation layer. The problems that according to an existing heat preservation pipeline, the
height difference cannot be compensated while the sealing effect is kept, the automatic clamping function cannot be achieved through the air pressure change of a butt joint area after butt joint, and the preheating function on the
peripheral space of the heat preservation pipeline cannot be achieved through hot air are solved.