吊(diao)(diao)架(jia)(jia)一般(ban)用(yong)(yong)(yong)(yong)(yong)(yong)于(yu)管(guan)(guan)子(zi)的(de)承重。其剛度較小(xiao)，與管(guan)(guan)子(zi)之間(jian)又不存(cun)在摩擦(ca)力，故它對管(guan)(guan)系(xi)的(de)柔性(xing)限制較小(xiao)。正(zheng)因為它的(de)剛度較小(xiao)，降低了管(guan)(guan)系(xi)的(de)穩定(ding)性(xing)，因此在一個管(guan)(guan)系(xi)中，不可全部用(yong)(yong)(yong)(yong)(yong)(yong)吊(diao)(diao)架(jia)(jia)承重。另外(wai)，當(dang)(dang)管(guan)(guan)子(zi)有(you)較大的(de)橫向(xiang)位移時(shi)，也(ye)不能(neng)選(xuan)用(yong)(yong)(yong)(yong)(yong)(yong)吊(diao)(diao)架(jia)(jia)，一般(ban)規定(ding)吊(diao)(diao)架(jia)(jia)吊(diao)(diao)桿的(de)偏(pian)轉角不大于(yu)4°。何時(shi)選(xuan)用(yong)(yong)(yong)(yong)(yong)(yong)吊(diao)(diao)架(jia)(jia)，何時(shi)選(xuan)用(yong)(yong)(yong)(yong)(yong)(yong)其他形式的(de)承重架(jia)(jia)，往往取(qu)決于(yu)可用(yong)(yong)(yong)(yong)(yong)(yong)的(de)支架(jia)(jia)生(sheng)根(gen)條件。當(dang)(dang)生(sheng)根(gen)點位于(yu)被(bei)支承管(guan)(guan)子(zi)的(de)上(shang)面時(shi)，可考慮用(yong)(yong)(yong)(yong)(yong)(yong)吊(diao)(diao)架(jia)(jia)。常用(yong)(yong)(yong)(yong)(yong)(yong)的(de)吊(diao)(diao)架(jia)(jia)形式如圖9-26所示。

  圖(tu)中共給出了A、B、C三(san)種(zhong)(zhong)生根形(xing)式(shi)和1、2、3、4、5、6六(liu)種(zhong)(zhong)吊裝形(xing)式(shi)。兩者組合共可(ke)(ke)得到(dao)18種(zhong)(zhong)吊架形(xing)式(shi)。在生根部件(jian)和附(fu)管部件(jian)之間還可(ke)(ke)根據需要添加其他(ta)中間連接件(jian)，如可(ke)(ke)調(diao)螺母（又稱花籃螺母）、彈簧吊架等。