對于變形(xing)量較大(da)(da)(40~60 mm以(yi)上)的(de)(de)情(qing)況,可采用(yong)(yong)以(yi)鋼板(ban)為跨縫(feng)(feng)材料的(de)(de)伸縮(suo)裝置,以(yi)鋼板(ban)為跨縫(feng)(feng)材料,一般用(yong)(yong)于中、大(da)(da)型橋梁,它在斷縫(feng)(feng)處(chu)用(yong)(yong)預埋(mai)(mai)鋼筋和(he)預埋(mai)(mai)鋼板(ban)固定梁兩端護緣(yuan)鋼板(ban),再將護緣(yuan)鋼板(ban)用(yong)(yong)高強螺(luo)栓與梳齒(chi)形(xing)鋼板(ban)連接,這樣梳齒(chi)鋼板(ban)固定在斷縫(feng)(feng)兩側(ce),通(tong)過梳齒(chi)的(de)(de)縫(feng)(feng)隙實現(xian)斷縫(feng)(feng)處(chu)的(de)(de)位移(yi)和(he)變形(xing)。