起重機的de結jie構gou是shi根gen據ju工gong作zuo穩wen定ding性xing確que定ding的de，機ji器qi結jie構gou一yi經jing確que定ding，起qi重zhong量liang就jiu被bei限xian定ding，為wei了le避bi免mian起qi重zhong量liang超chao載zai，設she計ji時shi配pei置zhi了le起qi重zhong量liang限xian製zhi器qi，若ruo起qi重zhong機ji超chao載zai，則ze起qi重zhong量liang限xian製zhi器qi動dong作zuo，切qie斷duan起qi升sheng機ji構gou電dian源yuan，從cong而er保bao證zheng起qi重zhong機ji安an全quan工gong作zuo。
但從以往發生的事故中看到，個別操作人員人為破壞起重量限製器或起重量限製器已損壞不修，起升作業時超載，如起重機起吊重量不明的重物或地下埋設物等，此時，過大的工作力矩作用在螺栓上，使螺栓強度不足而破壞。
起重機zaizhuanyigongdishixujinxingjieti，tashenbiaozhunjielianjieluoshuandiushideqingkuangshiyoufasheng，yidanfashengzhezhongqingkuang，jiejuedebanfayouliangge，yishixiangchangjiagoumaiyuanchangluoshuan，ershizizhigaoqiangduluoshuan，houzhebixujingguoshiyanzhengminghegehoufangkeshiyong。danzaigebieshigongrenyuanzhongyecunzaiyongcaizhibumingdetongchicunluoshuantidaigaoqiangluoshuandexianxiang，zhisuoyichuxianzhezhongqingkuang，qikenengyuanyinshicaozuorenyuancunzaijiaoxingxinli，jiaodeyongyilianggeputongluoshuanwuguanjinyaohuobuzhidaoqizhongdelihaiguanxi。
由於普通螺栓的強度無法滿足塔身標準節連接螺栓的高強度要求，起重機在使用中就會因強度不足發生斷裂，必然發生事故。
起重機zaizhuanyigongdishixujinxingjieti，tashenbiaozhunjielianjieluoshuandiushideqingkuangshiyoufasheng，yidanfashengzhezhongqingkuang，jiejuedebanfayouliangge，yishixiangchangjiagoumaiyuanchangluoshuan，ershizizhigaoqiangduluoshuan，houzhebixujingguoshiyanzhengminghegehoufangkeshiyong。danzaigebieshigongrenyuanzhongyecunzaiyongcaizhibumingdetongchicunluoshuantidaigaoqiangluoshuandexianxiang，zhisuoyichuxianzhezhongqingkuang，qikenengyuanyinshicaozuorenyuancunzaijiaoxingxinli，jiaodeyongyilianggeputongluoshuanwuguanjinyaohuobuzhidaoqizhongdelihaiguanxi。
由於普通螺栓的強度無法滿足塔身標準節連接螺栓的高強度要求，起重機在使用中就會因強度不足發生斷裂，必然發生事故。