PRESTRESS metal bellows tube because the appearance of a significant bump double wave, pipe joints for tight embossed type, firm not trip, contact with the scene after pouring concrete bond strength is very strong, with concrete to form a complete The one, enhance the seismic performance of the structure. Heng-licensing PRESTRESS lightweight thin-walled metal bellows, rigidity, not broken, do not leak pulp, fine features, compared with the general solid tablet, it light weight, span, small deflection, no column caps, safety good, and lower total cost, thus increasing the building clearance, increase the use and sale of the area, with the existing ordinary domestic slab structure, solid flat slab, unbonded prestressed concrete floor compared to save steel 5% -7 %, saving 10% -30% of concrete, saving vertical water, electricity, air conditioning, elevators, interior and exterior decoration with 5% -15%, and has the effect of noise insulation, the considerable economic benefits to the owners. Prestressed concrete bridge with metal bellows Uses: used in bridges, multi-storey factories, car parks, office buildings, apartment buildings, stadiums and other large buildings. Prestressed concrete bridge with a metal bellows is used for road / rail bridge engineering, slope anchor spiral prestressed bellows into the hole as a new material, it has not afraid of acid, alkali corrosion, sealing, no seepage, leakage of slurry, high ring stiffness, not afraid to step on the pressure, easy to transport, etc. stored in custody.