（一）、結(jie)構特點(dian)及(ji)功能

QZ系列球型支(zhi)座是由(you)上支(zhi)座板(ban)(ban)(ban)(ban)、下(xia)支(zhi)座板(ban)(ban)(ban)(ban)、凸形中(zhong)間板(ban)(ban)(ban)(ban)及兩塊不(bu)同(tong)形狀的(de)聚四氟乙烯板(ban)(ban)(ban)(ban)組成(cheng)。下(xia)支(zhi)座板(ban)(ban)(ban)(ban)中(zhong)間為一凹形球面，同(tong)凸形中(zhong)間包(bao)相對應(ying)，兩者之間有一弧(hu)形四氟板(ban)(ban)(ban)(ban)，通過求美棉與(yu)滑動來滿足梁端(duan)的(de)轉動；上座板(ban)(ban)(ban)(ban)上的(de)不(bu)銹鋼板(ban)(ban)(ban)(ban)與(yu)中(zhong)間鋼板(ban)(ban)(ban)(ban)上的(de)另一四氟板(ban)(ban)(ban)(ban)組成(cheng)第二滑動面，完(wan)成(cheng)梁體因(yin)溫差(cha)諸多原(yuan)因(yin)所產生的(de)伸縮(suo)位移(yi)。

QZ球(qiu)型支座以傳力(li)可靠，各(ge)向轉動性能一(yi)致(zhi) 轉動靈(ling)活(huo)的特點，不(bu)僅(jin)具備盆式橡膠支座承載(zai)能力(li)大，水平位移大等特點，而且能更好(hao)地適應(ying)大轉角的需要(yao)，適用(yong)于(yu)(yu)寬橋、曲(qu)線橋。由(you)于(yu)(yu)承壓部件不(bu)使用(yong)橡膠件，不(bu)存在橡膠低溫脆性等影響，因(yin)此特別適用(yong)于(yu)(yu)低溫地區。