1. If the tower crane is in the running state, if there is a large difference in the pre-tightening force in the same area, then the difference in the axial force borne by the connected bolts will be relatively large, so the bolts with a large pre-tightening force are under light load. In the long-term work under load, it is easy to cause damage, which means that if one of the eight basic bolts is found to be cracked during the operation, the above situation will occur, so special attention should be paid to maintaining the same pre-tightening force. In the process of manual operation, it may happen that the force of human resources is uneven, so the pretightening force of the bolts of the pole is also different. The solution is to use a daily torque wrench. 2. After the tower crane installed for the first time is in operation for 2 working hours, all bolt connection standard parts should be inspected once, and a regular date should be set to carefully check and rotate the tower arm. The bolts in the safe position should be in the balance arm Below, so as to ensure its safety factor. 3. In the process of changing the site, the tower crane bolts on the tower body should be carefully checked, and maintenance should be done on time. If cracks are found, or the damage at a certain position is serious, or partial deformation, etc., it is necessary to Replace the tower crane bolts in time, and do not reuse them many times, as this will cause obvious damage. If maijin finds that the tower crane does not meet the requirements, it cannot make self-adjustment. Because the requirements for the strength of tower crane bolts are particularly high on the construction site, it is necessary to use safe bolts to avoid accidents during the operation. The tower crane bolt is a standard part for mechanical tightening. It consists of two parts: the head and the nut, and must cooperate with the bolt to tighten and connect two parts including the eye pupil.