Precast Beam φ70φ90 Galvanized Metal Bellows for Beam Fabrication

As an important type of piping material, metal bellows play a crucial role in prestressed concrete structures. The design and manufacturing of its corrugated tube and wire mesh ensure its excellent performance in transmitting prestress and protecting the piping. The widespread application of this structure helps improve the quality and reliability of concrete structures, bringing significant advantages to the engineering field.

1. Rigidity Test: Under a concentrated load of 0.75KN or a distributed load of 1.5KN, radial deformation ≤0.1d.

2. Impermeability Test: No water leakage or slurry leakage after 30 minutes of filling with water or cement slurry with a water-cement ratio of 0.5.

3. Tensile Test: No damage to the pipe wall under an axial tensile force of 5KN.

4. Pull-Out Test: The pull-out resistance when embedded in concrete is more than 2.3 times the designed pull-out resistance of anchor bolts.

5. Bending Test: No water leakage or slurry leakage when the bending degree is 30d of the curvature radius.