Balance weight set free fall emergency braking device, which can realize auto control load loss protection, when the wellhead end accidental loss of load, balance weight free fall.
平衡重设置自由落体紧急制动装置，可实现井口端意外失载后平衡重自由落体坠落不能人控，却能自控失载保护的万无一失。
Abstract: During the service life of a bridge, it is impossible to avoid damage accumulation and function degeneration due to traffic load, environmental corrosion and accidental punch.
摘要桥梁结构在其服役过程中，由于荷载作用和各种环境不利因素的影响，结构不可避免的会产生累积损伤和功能退化，如不及时采取措施，甚至会导致突发事故。
Abstract: During the service life of a bridge, it is impossible to avoid damage accumulation and function degeneration due to traffic load, environmental corrosion and accidental punch.
摘要桥梁结构在其服役过程中，由于荷载作用和各种环境不利因素的影响，结构不可避免的会产生累积损伤和功能退化，如不及时采取措施，甚至会导致突发事故。
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