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"321"鋼橋是裝配式公路鋼橋,其最大特點是
貝雷片由上(shang)(shang)、下弦(xian)桿、豎(shu)桿及斜桿焊(han)接(jie)而成(cheng),上(shang)(shang)下弦(xian)桿的端(duan)部(bu)有陰陽接(jie)頭(tou),接(jie)頭(tou)上(shang)(shang)有杵架(jia)連(lian)接(jie)銷(xiao)孔(kong)(kong)。貝雷片(pian)的弦(xian)桿由兩(liang)(liang)根(gen)10號(hao)槽鋼(背(bei)靠(kao)背(bei))組合而成(cheng),在下弦(xian)桿上(shang)(shang),焊(han)有多(duo)(duo)塊(kuai)帶圓孔(kong)(kong)的鋼板,在上(shang)(shang)、下弦(xian)桿內有供(gong)與加強(qiang)弦(xian)桿和雙(shuang)層桁架(jia)連(lian)接(jie)的螺栓孔(kong)(kong),在上(shang)(shang)弦(xian)桿內還(huan)有供(gong)連(lian)接(jie)支(zhi)撐(cheng)架(jia)用(yong)(yong)(yong)的四個螺栓孔(kong)(kong),其中間的兩(liang)(liang)個孔(kong)(kong)是(shi)供(gong)雙(shuang)排(pai)(pai)或多(duo)(duo)排(pai)(pai)桁架(jia)同(tong)節(jie)間連(lian)接(jie)用(yong)(yong)(yong)的。靠(kao)兩(liang)(liang)端(duan)的兩(liang)(liang)個孔(kong)(kong)是(shi)跨節(jie)間連(lian)接(jie)用(yong)(yong)(yong)的。多(duo)(duo)排(pai)(pai)貝雷片(pian)作梁(liang)或柱使用(yong)(yong)(yong)時,必須(xu)用(yong)(yong)(yong)支(zhi)撐(cheng)架(jia)加固(gu)上(shang)(shang)下兩(liang)(liang)節(jie)貝雷片(pian)的接(jie)合部(bu)。


