對于(yu)變(bian)形量(liang)較大(da)（40～60 mm以上）的情況，可(ke)采(cai)用以鋼(gang)板(ban)(ban)(ban)為(wei)跨縫材料的伸縮裝置，以鋼(gang)板(ban)(ban)(ban)為(wei)跨縫材料，一(yi)般用于(yu)中、大(da)型橋梁，它在斷縫處用預埋(mai)鋼(gang)筋和預埋(mai)鋼(gang)板(ban)(ban)(ban)固(gu)定梁兩(liang)端護緣鋼(gang)板(ban)(ban)(ban)，再將護緣鋼(gang)板(ban)(ban)(ban)用高強(qiang)螺栓與(yu)梳齒(chi)形鋼(gang)板(ban)(ban)(ban)連接，這樣梳齒(chi)鋼(gang)板(ban)(ban)(ban)固(gu)定在斷縫兩(liang)側(ce)，通過梳齒(chi)的縫隙實現斷縫處的位(wei)移和變(bian)形。