對于(yu)變形(xing)量較大(40~60 mm以上)的(de)情況,可采用(yong)(yong)以鋼(gang)板(ban)為跨縫(feng)(feng)材料的(de)伸縮裝置,以鋼(gang)板(ban)為跨縫(feng)(feng)材料,一(yi)般用(yong)(yong)于(yu)中、大型橋梁(liang),它在斷(duan)縫(feng)(feng)處用(yong)(yong)預埋鋼(gang)筋和預埋鋼(gang)板(ban)固定梁(liang)兩端護緣(yuan)鋼(gang)板(ban),再(zai)將護緣(yuan)鋼(gang)板(ban)用(yong)(yong)高強螺栓與(yu)梳齒(chi)形(xing)鋼(gang)板(ban)連接,這樣(yang)梳齒(chi)鋼(gang)板(ban)固定在斷(duan)縫(feng)(feng)兩側,通過(guo)梳齒(chi)的(de)縫(feng)(feng)隙實現(xian)斷(duan)縫(feng)(feng)處的(de)位(wei)移和變形(xing)。