對(dui)于(yu)變(bian)形量較大（40～60 mm以(yi)上(shang)）的情(qing)況，可(ke)采用以(yi)鋼(gang)(gang)板(ban)(ban)(ban)為(wei)跨縫材料的伸(shen)縮裝置，以(yi)鋼(gang)(gang)板(ban)(ban)(ban)為(wei)跨縫材料，一般用于(yu)中(zhong)、大型(xing)橋梁(liang)，它(ta)在斷(duan)縫處用預埋鋼(gang)(gang)筋和預埋鋼(gang)(gang)板(ban)(ban)(ban)固定(ding)梁(liang)兩端(duan)護緣(yuan)鋼(gang)(gang)板(ban)(ban)(ban)，再將護緣(yuan)鋼(gang)(gang)板(ban)(ban)(ban)用高強螺栓與梳(shu)齒形鋼(gang)(gang)板(ban)(ban)(ban)連(lian)接，這樣梳(shu)齒鋼(gang)(gang)板(ban)(ban)(ban)固定(ding)在斷(duan)縫兩側，通過(guo)梳(shu)齒的縫隙(xi)實現斷(duan)縫處的位移和變(bian)形。