COMPOSITE JACK DEVICE FOR PUSH-UP AND PULL-UP

摘要

PURPOSE: To obtain required sufficient reaction, and enable stable lifting and lowering in a balanced manner by engaging an engaging pin with an engaging hole even when upper and lower trestles are brought to an unstable state by unbalanced load with the expansion and contraction operation of a jack. ;CONSTITUTION: Steel materials 15, 16, on which guide rollers 5 and a lock pin device 6 are mounted, are carried onto a field, and upper and lower trestles 3, 4 are assembled centering around a post 1, and two jacks 2 are incorporated and the trestles 3, 4 are connected. The heavy body to be lifted of a building is placed on the upper side trestle 3, a lower locking device 7 is driven first and a lock pin 7a is latched on the reaction receiving section 8 of the post 1, and engaging pins 24 are engaged with engaging holes 23 and lifting preparation is conducted. The jacks 2 are elongated and the heavy body to be lifted is pushed up, and a lock pin 6a is latched onto the reaction receiving section 8 of the post 1 when the jacks reach a full effective stroke, thus replacing load.;COPYRIGHT: (C)1994,JPO&Japio