對于(yu)變形(xing)量較大(40~60 mm以(yi)(yi)上)的情(qing)況,可采用(yong)以(yi)(yi)鋼(gang)(gang)板(ban)為跨縫(feng)材料的伸縮裝置,以(yi)(yi)鋼(gang)(gang)板(ban)為跨縫(feng)材料,一(yi)般用(yong)于(yu)中、大型橋梁,它(ta)在(zai)斷縫(feng)處(chu)用(yong)預(yu)埋(mai)(mai)鋼(gang)(gang)筋和預(yu)埋(mai)(mai)鋼(gang)(gang)板(ban)固(gu)定(ding)梁兩(liang)端(duan)護緣鋼(gang)(gang)板(ban),再將護緣鋼(gang)(gang)板(ban)用(yong)高強螺栓與梳齒(chi)形(xing)鋼(gang)(gang)板(ban)連接,這樣梳齒(chi)鋼(gang)(gang)板(ban)固(gu)定(ding)在(zai)斷縫(feng)兩(liang)側,通(tong)過(guo)梳齒(chi)的縫(feng)隙實現斷縫(feng)處(chu)的位(wei)移和變形(xing)。