2. Loose external environment, such as a strong external impact force, the impact of the typhoon, or they are basically man-made damage. This essentially results from three main loose zinc steel guardrail, then we have a zinc steel fence on the first thing to fix loose to watch, which is part of the guardrail. Then, based on the external characteristics of zinc to steel fence is determined that the cause of the relaxation. And then repair it. It is to discover where the problem lies and bind for the cause.
3. due to changes in the environment outside the loose zinc steel guardrail, such as a solid upright position loose, do not loosen with the corrosion of stainless steel screws, which caused by corrosion.
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