Expander

The invention discloses an expander, and relates to the technical field of building prestress construction tools. Comprising a motor and a plurality of expansion assemblies with a telescopic function, and the lower portion of each expansion assembly is in power connection with a worm speed reducer; the device further comprises a power input shaft. The power input shaft is in power connection with each worm speed reducer, and one end of the power input shaft is connected with the motor through a coupler; one end of the expansion releasing assembly abuts against the prestress anchoring force bearing rib dividing frame, and the other end of the expansion releasing assembly abuts against the force bearing frame. And a plurality of conical hole arrays are arranged on the prestressed anchoring force-bearing rib-dividing frame. All the expansion assemblies are driven by the motor to expand at the same time, and cracks caused by deviation stress are effectively avoided. 本发明公开了一种放涨器，涉及建筑预应力施工工具技术领域。包括电动机和多个具有伸缩功能的放涨组件