對(dui)于(yu)變形(xing)量較(jiao)大(da)（40～60 mm以上(shang)）的情(qing)況(kuang)，可采用(yong)以鋼板(ban)(ban)為(wei)跨縫(feng)(feng)材(cai)料(liao)的伸(shen)縮裝置(zhi)，以鋼板(ban)(ban)為(wei)跨縫(feng)(feng)材(cai)料(liao)，一(yi)般用(yong)于(yu)中、大(da)型橋梁(liang)，它在(zai)斷(duan)縫(feng)(feng)處(chu)(chu)用(yong)預埋(mai)鋼筋和(he)預埋(mai)鋼板(ban)(ban)固定梁(liang)兩(liang)端護(hu)緣鋼板(ban)(ban)，再(zai)將(jiang)護(hu)緣鋼板(ban)(ban)用(yong)高(gao)強螺栓與(yu)梳(shu)齒(chi)形(xing)鋼板(ban)(ban)連接(jie)，這(zhe)樣梳(shu)齒(chi)鋼板(ban)(ban)固定在(zai)斷(duan)縫(feng)(feng)兩(liang)側，通(tong)過梳(shu)齒(chi)的縫(feng)(feng)隙(xi)實(shi)現斷(duan)縫(feng)(feng)處(chu)(chu)的位移和(he)變形(xing)。