The through-core jack is a double-acting jack that uses dual hydraulic cylinders to tension the prestressed tendons and press anchors. Through-core jacks are suitable for tensioning straps
Its working principle is: when the prestressed tendons are tensioned, the oil nozzle of the tensioning cylinder enters the oil, the oil nozzle of the top pressure cylinder returns oil, the top pressure oil cylinder, the connecting sleeve and the supporting sleeve are connected together and move to the right to withstand the anchor ring; the tensioning cylinder, end The cap nut, the plug and the core sleeve are connected as a whole to drive the tool anchor to move to the left to tension the prestressed tendons; when the anchor is under pressure, the oil nozzle of the pressure cylinder is filled with oil, the piston and the protective sleeve are kept under the condition of maintaining a stable tension. Integrate with the jacking head and move it to the right to force the clip into the anchor ring; at this time, the oil nozzle of the tension cylinder returns oil, the oil nozzle of the top pressure cylinder enters, and the tension cylinder returns hydraulically. Finally, the oil nozzles of the tensioning cylinder and the top pressure cylinder return oil at the same time, and the top pressure piston returns to the return stroke under the action of the spring force.
For large-span structures, long steel wire bundles and other large extensions, it is advisable to use a through-core jack.
