The embedded metal corrugated pipe method is to embed the metal corrugated pipe with the same diameter as the hole into the concrete component without the need to extract it. Corrugated pipes are generally made of thin steel strips (thickness 0.3mm) that are pressed and rolled into black iron pipes, thin steel pipes or galvanized double corrugated metal hoses. It has the characteristics of light weight, good stiffness, easy bending, simple connection, and small friction coefficient. The embedded pipe method has the advantages of eliminating the need for pipe extraction, the location and shape of the tunnel can be easily guaranteed, and it has good bonding with concrete. It can be made into various shapes of tunnels, so it is currently widely used and is a modern post-processing method. Ideal material for forming tunnels in tensile prestressed tendons. Each metal corrugated pipe is 4 to 6 meters long. It can also be made on-site according to needs, and the length is not limited. The corrugated pipe will not deform under the action of 1KN radial force. A water filling test should be done before use to check whether there is leakage. The shape of the corrugated pipe is divided into single corrugation and double corrugation according to the difference in the number of protrusions (corrugations) between each two adjacent folding bites. The inner diameter of the corrugated pipe is 40~100mm, with increments of 5mm; the height of the corrugated pipe is 2.5mm for single corrugation and 3.5mm for double corrugation; corrugated pipes of different lengths can be rolled according to transportation requirements or tunnel length; when the amount of corrugated pipe is large , the manufacturer can bring a pipe rolling machine to the site for production, and the pipe length is not limited. Before installation, the prestressed curve coordinates in the design drawings should be followed in advance, and the bottom edge of the bellows should be used as the standard. The curve should be popped up on one side of the mold to determine the position of the bellows; the beam template can also be used as the benchmark, and the prestressed tendons can be The coordinates of each point on the curve are marked on the stirrup glue that has been padded with bottom reinforcement protective layer pads to determine the curve position of the corrugated pipe. The fixing of the corrugated pipe can be completed with steel brackets or tic-tac-toe frames, and welded to the steel bars at intervals of 50 to 100 cm. When it is a curved channel, it should be densely packed and tied firmly with iron wire to prevent the pipe from floating up when pouring concrete (first penetrate the prestressed pipe) The condition of the ribs is slightly better) causing quality accidents. Connection of grout holes and corrugated pipes. The method is to make a hole in the corrugated pipe, cover it with a sponge gasket and a plastic curved pressure plate with a mouth, and tie it with iron wire, then insert a reinforced plastic tube into the mouth of the plastic curved pressure plate, and lead it out of the top surface of the beam 400～500mm. Grouting holes should be set at both ends of the component and in the pipe, and the spacing between them should not be greater than 12m (the spacing between grouting holes should not be greater than 30m when the corrugated pipe is pre-embedded). A bleeding pipe should be installed at the curve peak position of the curved channel.