... wall of rising up a safety net, later every 4 m set to a fixed safety net; In WaiJia, bridge ... 15 cm; Nets lows and object surface below more than 3 m distance. Set up the support of the safety net, ... less than 8 cm, must not be more than 4 m distance poles. 2, before the use should check whether ... recovery, and the unit set checked, can be used. 3, often should clean up nets the impurities in the, in ...