MN73屋面(mian)系(xi)統可(ke)通過屋面(mian)板的(de)自由滑動釋放熱脹冷縮產生的(de)形變(bian)(bian)。系(xi)統設計時一般將屋面(mian)板在(zai)屋檐處固定，屋脊處自由伸縮，使(shi)該(gai)形變(bian)(bian)既不影響(xiang)建(jian)筑功能，又不破壞建(jian)筑外觀。
美耐建筑(zhu)自(zi)主研發的(de)滑(hua)(hua)動(dong)(dong)支架是連(lian)(lian)接(jie)屋(wu)(wu)(wu)面(mian)(mian)(mian)板和(he)結構件(jian)、且實(shi)現屋(wu)(wu)(wu)面(mian)(mian)(mian)板自(zi)由滑(hua)(hua)動(dong)(dong)的(de)關(guan)鍵。一方面(mian)(mian)(mian)，可(ke)(ke)滑(hua)(hua)動(dong)(dong)式連(lian)(lian)接(jie)件(jian)可(ke)(ke)同時承載屋(wu)(wu)(wu)面(mian)(mian)(mian)上的(de)雪壓和(he)人行壓力，也(ye)(ye)可(ke)(ke)以(yi)(yi)拉緊(jin)屋(wu)(wu)(wu)面(mian)(mian)(mian)，避免被風掀起(qi)。另一方面(mian)(mian)(mian)，連(lian)(lian)接(jie)件(jian)的(de)可(ke)(ke)滑(hua)(hua)動(dong)(dong)性能可(ke)(ke)以(yi)(yi)使(shi)屋(wu)(wu)(wu)面(mian)(mian)(mian)板自(zi)由滑(hua)(hua)動(dong)(dong)，從(cong)而釋放熱應力，避免連(lian)(lian)接(jie)破(po)壞。同時，檁條(tiao)預沖孔技術也(ye)(ye)確保了數量眾(zhong)多(duo)的(de)連(lian)(lian)接(jie)件(jian)在一條(tiao)直(zhi)線上順(shun)暢(chang)滑(hua)(hua)動(dong)(dong)。
此外，在高低(di)跨處、屋面(mian)(mian)開口等節點處，屋面(mian)(mian)的熱脹冷縮也(ye)得到了(le)妥善處理(li)。
