對(dui)于變形量較大(da)（40～60 mm以上(shang)）的(de)情(qing)況，可采用以鋼(gang)(gang)板(ban)(ban)(ban)為跨縫(feng)材料的(de)伸縮(suo)裝置，以鋼(gang)(gang)板(ban)(ban)(ban)為跨縫(feng)材料，一般用于中、大(da)型橋(qiao)梁(liang)，它在(zai)斷縫(feng)處用預埋鋼(gang)(gang)筋(jin)和預埋鋼(gang)(gang)板(ban)(ban)(ban)固定梁(liang)兩(liang)端護緣(yuan)鋼(gang)(gang)板(ban)(ban)(ban)，再將(jiang)護緣(yuan)鋼(gang)(gang)板(ban)(ban)(ban)用高強螺栓與梳齒(chi)(chi)形鋼(gang)(gang)板(ban)(ban)(ban)連接，這樣梳齒(chi)(chi)鋼(gang)(gang)板(ban)(ban)(ban)固定在(zai)斷縫(feng)兩(liang)側，通過梳齒(chi)(chi)的(de)縫(feng)隙實現斷縫(feng)處的(de)位(wei)移和變形。