對于變形量較大（40～60 mm以(yi)上）的(de)(de)情況，可(ke)采用(yong)(yong)(yong)以(yi)鋼(gang)(gang)板(ban)(ban)(ban)為(wei)跨縫(feng)(feng)(feng)材(cai)料的(de)(de)伸縮裝置，以(yi)鋼(gang)(gang)板(ban)(ban)(ban)為(wei)跨縫(feng)(feng)(feng)材(cai)料，一(yi)般用(yong)(yong)(yong)于中、大型(xing)橋梁，它在斷(duan)(duan)縫(feng)(feng)(feng)處用(yong)(yong)(yong)預埋鋼(gang)(gang)筋和預埋鋼(gang)(gang)板(ban)(ban)(ban)固(gu)定梁兩端護緣(yuan)鋼(gang)(gang)板(ban)(ban)(ban)，再(zai)將護緣(yuan)鋼(gang)(gang)板(ban)(ban)(ban)用(yong)(yong)(yong)高強螺栓與梳齒(chi)形鋼(gang)(gang)板(ban)(ban)(ban)連接，這樣梳齒(chi)鋼(gang)(gang)板(ban)(ban)(ban)固(gu)定在斷(duan)(duan)縫(feng)(feng)(feng)兩側，通過梳齒(chi)的(de)(de)縫(feng)(feng)(feng)隙(xi)實現斷(duan)(duan)縫(feng)(feng)(feng)處的(de)(de)位移和變形。