對(dui)于(yu)變形(xing)量較大(da)（40～60 mm以上）的(de)情況，可采用以鋼(gang)(gang)(gang)板(ban)(ban)(ban)為跨縫(feng)(feng)材料的(de)伸縮裝置，以鋼(gang)(gang)(gang)板(ban)(ban)(ban)為跨縫(feng)(feng)材料，一般用于(yu)中、大(da)型橋(qiao)梁(liang)，它(ta)在(zai)斷(duan)(duan)縫(feng)(feng)處用預(yu)埋鋼(gang)(gang)(gang)筋和預(yu)埋鋼(gang)(gang)(gang)板(ban)(ban)(ban)固定(ding)梁(liang)兩端護緣鋼(gang)(gang)(gang)板(ban)(ban)(ban)，再將護緣鋼(gang)(gang)(gang)板(ban)(ban)(ban)用高強螺栓與梳齒形(xing)鋼(gang)(gang)(gang)板(ban)(ban)(ban)連接，這樣梳齒鋼(gang)(gang)(gang)板(ban)(ban)(ban)固定(ding)在(zai)斷(duan)(duan)縫(feng)(feng)兩側，通過梳齒的(de)縫(feng)(feng)隙實現斷(duan)(duan)縫(feng)(feng)處的(de)位移(yi)和變形(xing)。