Key parts of the steel base material fatigue caused by cracks or critical weld cracks

Fatigue cracks are a variety of factors, and design, manufacturing, materials related, but most of the fatigue cracks close relationship with the long-term overload is the gradual accumulation of results.bridge gantry crane With China's construction technology revolution, construction speed leaps and bounds, three days floor no longer a myth, in the past few years, a few months to complete the project becomes complete. Such a fast paced and more attention should be paid equipment standard operation and maintenance work, the opposite is the original date equipment at specialized management agencies, machinery has been optimized at the most streamlined, functional greatly weakened, and even some companies simply do not exist equipment management department. Not only that, some leaders in order to improve the speed of construction,hoist gantry crane to "break people do not Xiema" tactics are commonplace. As everyone knows, "horse" is also tiring and long illness, when, if not well-fed, care will be "stumbled." At first only a small steel fatigue crack extension reaches a certain level will slowly cause the accident, as we always check, timely detection and timely treatment, can avoid such incidents. Prone to fatigue of the site are: base section and the bottom beam connections, diagonal brace to strengthen the above section, or standard section of the main limb or connected sets at the weld, the tower at variable cross-section, the upper and lower bearings,overhead gantry crane slewing tower , the top lower main limb or ear panels.

Comments: steel and weld fatigue caused the accident is also more link. Used for many years more devices are more accidents due to fatigue, many accidents are fatigue and illegal operations combine to happen.