A bridge is a large structure erected on rivers, lakes, and seas, with upper and lower parts, supports, and ancillary structures in its structural structure. The supports are the force transmission devices installed at the support points of the bridge span structure and piers or abutments. Bridge jacks are required during the construction and maintenance of bridges.

The appearance of bridge jacks is mostly slim design, with a small volume, but it can generate greater working capacity, especially in situations where the space is narrow and other large equipment is inconvenient to operate. Due to the huge weight of the lifted object, jack manufacturers will equip it with a handle when manufacturing and producing jacks of 50T and above models, making it easy for operators to carry the jacks on site.

Bridge jacks can be used in the replacement of bridge supports. When using them, it is necessary to choose a suitable tonnage jack according to the weight of the bridge pier, and place the jack next to the support in advance. The bridge can be lifted up using electricity or the hydraulic function of the jack, and then the old support can be removed, replaced with a new support, and the bridge pier can be lowered.