预应力千斤顶是用于张拉钢铰线等预应力筋的千斤顶。预应力千斤顶均为穿心式液压双作用千斤顶，预应力千斤顶需和高压油泵配合使用，张拉和回顶的动力均由高压油泵的高压油提供。根据结构的不同又分为前卡千斤顶和普通穿心式千斤顶。 预 
    　使用前应严格检查千斤顶的参数，切忌压载使用。张拉前检查油泵油量，并使千斤顶空行程运行几次以排空千斤顶及内的空气。 　　前卡千斤顶主要用于初张拉和单根锚具张拉，普通穿心式千斤顶主要用于群锚整体张拉。安装锚具及千斤顶时，对直线预应力筋，应使张拉力的作用线与孔道中心线在张拉过程中相互重合；对曲线预应力筋，应使张拉力的作用线与孔道末端中心点的切线相互重合。张拉时预应力筋从工作锚、限位板、千斤顶中间穿过。预应力筋的张拉顺序应合设计要求。                                

YDC穿心式千斤顶参数                
型号规格   公称张拉力 (KN)   公称(Mpa)    穿心孔径 (mm)    装限位板孔径 (mm)      装工具锚孔径 (mm)      外径 尺寸(mm)    直径*高度
YDC650               650             48                              72                              99                                       95                                     200*385 
YDC1000              1000             50                              78                              111                                       111                                     230*385 
YDC1500              1500             52                              94                              150                                       150                                     270*390 
YDC2000              2000             53                              118                              177                                       177                                     320*400 
YDC2500              2500             52                              128                           210                                       185                                     345*400 
YDC3000              3000             52                              135                              190                                       185                                     370*400 
YDC3500              3500             51                              160                              232                                       232                                     420*400 
YD000             4000            52                              165                              252                                       252                                     450*410 
YDC5000             5000            52                              196                              260                                       265                                     500*410 
YDC6500             6500            53                              220                           295                                       235                                     580*420 
YDC10000       10000            50                              270                              440                                       415                                     740*570