Relay ring - a number of relay oil cylinders are arranged in a ring in the relay ring, with a stroke of 200 mm. Obviously, the long-distance pipe jacking is divided into several sections, and a relay ring is set between the sections. The relay jacking equipment can make the subsequent sections only overcome the side friction of the jacking section. Start the relay ring oil cylinder from front to back, and the jacking pipe can realize long-distance jacking. When the relay ring cylinder works, the rear pipe section becomes the back seat, pushing the adjacent pipe section in front to the front, and overcoming the side friction in sections.