Both buildings and bridges require the installation of crossbeams, which are crucial load-bearing devices. The pin holes on the crossbeam allow for the installation of external formwork supports, which can be adjusted vertically and horizontally using hydraulic or screw jacks.

Spiral jacks, especially large tonnage jacks, are equipment that use mechanical principles to lift heavy objects. They have no risk of oil leakage, long support time, and can be used both vertically and horizontally. They are often used to lift crossbeams, and the jack contacts the bottom template of the crossbeam.

When a certain section of the building beam needs to be lifted upwards, people can also place multiple screw jacks under the beam at the same time, use the lifting force of the jacks to lift the building, facilitate people's reinforcement treatment of the building, and prevent premature bending and deformation of the steel bars under heavy pressure.

However, when repairing vehicles, we must not use a screw jack to support the bumper, crossbeam, and other components of the car. We can only push the manufacturer's designated concave and convex positions.