吊(diao)(diao)(diao)架(jia)(jia)一般(ban)用(yong)(yong)(yong)(yong)(yong)于(yu)(yu)管(guan)(guan)(guan)子的(de)(de)承(cheng)重。其剛度較小(xiao)，與管(guan)(guan)(guan)子之間(jian)又不存在摩擦力，故它對管(guan)(guan)(guan)系(xi)的(de)(de)柔(rou)性(xing)限制較小(xiao)。正(zheng)因為它的(de)(de)剛度較小(xiao)，降低了(le)管(guan)(guan)(guan)系(xi)的(de)(de)穩定性(xing)，因此在一個管(guan)(guan)(guan)系(xi)中，不可全部用(yong)(yong)(yong)(yong)(yong)吊(diao)(diao)(diao)架(jia)(jia)承(cheng)重。另外，當(dang)管(guan)(guan)(guan)子有較大的(de)(de)橫向位(wei)移時，也不能選(xuan)用(yong)(yong)(yong)(yong)(yong)吊(diao)(diao)(diao)架(jia)(jia)，一般(ban)規定吊(diao)(diao)(diao)架(jia)(jia)吊(diao)(diao)(diao)桿的(de)(de)偏轉角(jiao)不大于(yu)(yu)4°。何時選(xuan)用(yong)(yong)(yong)(yong)(yong)吊(diao)(diao)(diao)架(jia)(jia)，何時選(xuan)用(yong)(yong)(yong)(yong)(yong)其他形(xing)式(shi)的(de)(de)承(cheng)重架(jia)(jia)，往往取決于(yu)(yu)可用(yong)(yong)(yong)(yong)(yong)的(de)(de)支(zhi)架(jia)(jia)生(sheng)根條件。當(dang)生(sheng)根點位(wei)于(yu)(yu)被支(zhi)承(cheng)管(guan)(guan)(guan)子的(de)(de)上面時，可考(kao)慮用(yong)(yong)(yong)(yong)(yong)吊(diao)(diao)(diao)架(jia)(jia)。常用(yong)(yong)(yong)(yong)(yong)的(de)(de)吊(diao)(diao)(diao)架(jia)(jia)形(xing)式(shi)如圖9-26所示。

  圖中共(gong)給出(chu)了A、B、C三(san)種生根形(xing)式和1、2、3、4、5、6六種吊裝形(xing)式。兩者組合(he)共(gong)可得到18種吊架形(xing)式。在生根部(bu)件(jian)和附管部(bu)件(jian)之間(jian)還可根據(ju)需要添(tian)加(jia)其(qi)他中間(jian)連接件(jian)，如可調螺母（又稱花籃螺母）、彈簧吊架等。