The spiral jack is a mechanical jack. It is a lifting or top pressure tool that uses spiral transmission to lift heavy objects. It saves effort because of the principle of leverage and use gears to make power transmission. Wide scope of use: It can often be seen on bridge construction, building support, factory operations, dock construction and other places. The spiral jack can be used to use the direction of force. The conventional hydraulic jack cannot be used tilted, and the leakage may occur if it is tilted. And in comparison, the top of the spiral jack is more suitable for the long -term top -up support work. It is not easy to decline during support. Therefore, the spiral jack is often seen in the bridge construction.