對(dui)于(yu)變形量較大(40~60 mm以上)的(de)情況,可采用(yong)以鋼板(ban)為跨縫(feng)材(cai)料的(de)伸縮裝置,以鋼板(ban)為跨縫(feng)材(cai)料,一般用(yong)于(yu)中、大型(xing)橋梁,它在(zai)斷縫(feng)處用(yong)預埋鋼筋(jin)和預埋鋼板(ban)固(gu)(gu)定梁兩端護緣鋼板(ban),再將護緣鋼板(ban)用(yong)高(gao)強螺栓與(yu)梳(shu)齒(chi)形鋼板(ban)連接,這樣(yang)梳(shu)齒(chi)鋼板(ban)固(gu)(gu)定在(zai)斷縫(feng)兩側(ce),通過梳(shu)齒(chi)的(de)縫(feng)隙實現斷縫(feng)處的(de)位移和變形。