對于變形量較(jiao)大(da)（40～60 mm以上(shang)）的(de)情況，可采用(yong)以鋼(gang)(gang)(gang)板(ban)(ban)為跨(kua)縫(feng)(feng)材料的(de)伸縮裝置，以鋼(gang)(gang)(gang)板(ban)(ban)為跨(kua)縫(feng)(feng)材料，一般(ban)用(yong)于中、大(da)型橋(qiao)梁(liang)，它在斷縫(feng)(feng)處(chu)用(yong)預埋鋼(gang)(gang)(gang)筋和(he)預埋鋼(gang)(gang)(gang)板(ban)(ban)固(gu)定(ding)梁(liang)兩(liang)端護(hu)緣鋼(gang)(gang)(gang)板(ban)(ban)，再將護(hu)緣鋼(gang)(gang)(gang)板(ban)(ban)用(yong)高強螺栓與(yu)梳(shu)齒(chi)形鋼(gang)(gang)(gang)板(ban)(ban)連(lian)接，這(zhe)樣梳(shu)齒(chi)鋼(gang)(gang)(gang)板(ban)(ban)固(gu)定(ding)在斷縫(feng)(feng)兩(liang)側，通(tong)過梳(shu)齒(chi)的(de)縫(feng)(feng)隙實現斷縫(feng)(feng)處(chu)的(de)位(wei)移和(he)變形。