MN73屋(wu)面(mian)系(xi)統可通過(guo)屋(wu)面(mian)板的自由滑(hua)動釋放熱脹冷縮產(chan)生的形(xing)變。系(xi)統設計時一般(ban)將(jiang)屋(wu)面(mian)板在(zai)屋(wu)檐處(chu)固定，屋(wu)脊處(chu)自由伸縮，使該形(xing)變既不影(ying)響(xiang)建筑功能，又(you)不破壞建筑外觀。
美耐建筑自(zi)主研(yan)發的(de)滑(hua)(hua)動支(zhi)架是連(lian)(lian)接(jie)(jie)屋(wu)(wu)(wu)面(mian)(mian)(mian)(mian)板(ban)(ban)和結(jie)構件、且實現屋(wu)(wu)(wu)面(mian)(mian)(mian)(mian)板(ban)(ban)自(zi)由(you)滑(hua)(hua)動的(de)關鍵。一方面(mian)(mian)(mian)(mian)，可(ke)(ke)滑(hua)(hua)動式連(lian)(lian)接(jie)(jie)件可(ke)(ke)同時承(cheng)載屋(wu)(wu)(wu)面(mian)(mian)(mian)(mian)上(shang)的(de)雪壓(ya)和人行壓(ya)力，也可(ke)(ke)以拉緊屋(wu)(wu)(wu)面(mian)(mian)(mian)(mian)，避免(mian)被風掀起。另一方面(mian)(mian)(mian)(mian)，連(lian)(lian)接(jie)(jie)件的(de)可(ke)(ke)滑(hua)(hua)動性能可(ke)(ke)以使屋(wu)(wu)(wu)面(mian)(mian)(mian)(mian)板(ban)(ban)自(zi)由(you)滑(hua)(hua)動，從而釋(shi)放熱應力，避免(mian)連(lian)(lian)接(jie)(jie)破壞(huai)。同時，檁條預(yu)沖孔(kong)技術也確保(bao)了數量眾多的(de)連(lian)(lian)接(jie)(jie)件在一條直線(xian)上(shang)順暢滑(hua)(hua)動。
此外，在高(gao)低跨處、屋面開口等節(jie)點處，屋面的熱(re)脹冷(leng)縮也得到(dao)了妥(tuo)善處理。
