The present invention relates to a working jig of long tie rods which by carbonizing chamber sealed so that the upper side and that the expansion and contraction depending on the temperature difference control according to the degree of the stretching is not generated a gap of the combustion chamber and the carbonizing chamber provided between the combustion chamber, further specifically, the installation of the cylinder so as to prevent the blocking incident musculoskeletal the like from occurring during the installation of long tie rods to assemble and disassemble the cylinder of the heavy load (40 ~ 50kg) in a narrow space between the carbonization chamber top surface operation or prevents accidents by making the dissolution of the lifting cylinder to the heavy load by using the load reduction principle of the pulley easily in advance thereof Paper for installation and dismantling of long tie rods which give increased safety and rapidity of action.