對于變形(xing)(xing)量較大（40～60 mm以(yi)(yi)上）的(de)情(qing)況，可采用以(yi)(yi)鋼板(ban)(ban)(ban)為跨縫(feng)材料的(de)伸縮裝置，以(yi)(yi)鋼板(ban)(ban)(ban)為跨縫(feng)材料，一般用于中、大型橋梁，它(ta)在(zai)斷縫(feng)處用預埋鋼筋和(he)預埋鋼板(ban)(ban)(ban)固(gu)定梁兩端護緣鋼板(ban)(ban)(ban)，再將護緣鋼板(ban)(ban)(ban)用高強螺栓(shuan)與(yu)梳(shu)齒形(xing)(xing)鋼板(ban)(ban)(ban)連接，這樣(yang)梳(shu)齒鋼板(ban)(ban)(ban)固(gu)定在(zai)斷縫(feng)兩側，通過梳(shu)齒的(de)縫(feng)隙(xi)實現斷縫(feng)處的(de)位移和(he)變形(xing)(xing)。