护栏网是否需要定期检查和更换？
是的，护栏网需要定期检查和更换。这是因为护栏网可能会因为使用时间长、风吹日晒等原因而出现老化、腐蚀等情况，这些都会降低其安全性。因此，为了保障人们的生命财产安全，建议每年至少对护栏网进行一次全面的检查，并根据实际情况及时更换已经老化的或损坏的护栏网。
此外，在以下情况下，也应及时更换护栏网：
护栏网的高度、宽度、间隙等参数不符合相关标准要求；
护栏网的材料质量不佳或者经过长时间使用后已严重变形或破损；
护栏网的连接处存在松动或脱落等问题；
护栏网周围环境恶劣，如受到强烈风吹雨淋等影响，导致护栏网受损；
周边地形地貌发生变化，原有护栏网无法适应新的环境需求等。
总之，定期检查和更换护栏网是非常重要的，可以有效避免因护栏网老化、损坏等问题引发的安全事故。
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