采用螺旋波紋鋼圓管、環形波紋鋼圓管管節時,鋼波紋涵管應(ying)具有足夠的剛度。管節的剛度用(yong)柔度系數FF表示,不宜(yi)大于規范提(ti)供的參考值。
鋼波紋涵管具有重量輕、安裝方便快捷、耐久性好、工程造價低、抗變形能力強、減少通車后養護成本等特點
采(cai)用(yong)(yong)碳(tan)素結構鋼(gang)的(de)波(bo)紋(wen)鋼(gang)圓(yuan)管(guan)、波(bo)紋(wen)鋼(gang)板件和(he)(he)管(guan)箍、法(fa)蘭盤及高強度螺栓、螺母,出廠前應(ying)進行(xing)熱浸鍍(du)鋅防腐處(chu)理:采(cai)用(yong)(yong)連續熱鍍(du)鋅鋼(gang)板及鋼(gang)帶加工(gong)波(bo)紋(wen)鋼(gang)圓(yuan)管(guan)、波(bo)紋(wen)鋼(gang)板件, 其(qi)加工(gong)后的(de)有效鋅層(ceng)厚(hou)度和(he)(he)質量不應(ying)低于規范規定的(de)要求。鍍(du)鋅基礎上可(ke)采(cai)用(yong)(yong)涂(tu)(tu)裝或噴涂(tu)(tu)瀝青(qing)等(deng)非金屬覆蓋層(ceng)。當采(cai)用(yong)(yong)噴涂(tu)(tu)瀝青(qing)時,瀝青(qing)涂(tu)(tu)層(ceng)的(de)厚(hou)度應(ying)為0.5mm—1mm,涂(tu)(tu)層(ceng)應(ying)均勻光滑(hua)、連續,無肉眼可(ke)分辨的(de)孔隙、裂(lie)縫、脫皮及其(qi)他缺陷。
鋼波紋涵管是采(cai)用波(bo)(bo)紋(wen)狀管或(huo)由波(bo)(bo)紋(wen)狀板(ban)通(tong)過連接、拼裝形(xing)(xing)成(cheng)的(de)一(yi)(yi)種涵(han)(han)洞(dong)(dong)(dong)形(xing)(xing)式。對公路涵(han)(han)洞(dong)(dong)(dong)來說,涵(han)(han)洞(dong)(dong)(dong)的(de)不(bu)均勻(yun)沉降是其破壞的(de)主(zhu)要型式之(zhi)一(yi)(yi),鋼(gang)波(bo)(bo)紋(wen)涵(han)(han)管具有(you)重(zhong)量(liang)輕、安裝方便快捷、耐久性好、工(gong)程造(zao)價低、抗變(bian)(bian)形(xing)(xing)能(neng)力強、減少通(tong)車后養護成(cheng)本等特點。從材料與結構和功(gong)能(neng)的(de)本質關系上分(fen)析,采(cai)用柔性高(gao)強度的(de)鋼(gang)波(bo)(bo)紋(wen)涵(han)(han)管洞(dong)(dong)(dong),不(bu)僅具有(you)適應地(di)基(ji)與基(ji)礎變(bian)(bian)形(xing)(xing)的(de)能(neng)力,可以(yi)解(jie)決因地(di)基(ji)基(ji)礎不(bu)均勻(yun)沉降導致的(de)涵(han)(han)洞(dong)(dong)(dong)破壞問(wen)題,而(er)且鋼(gang)波(bo)(bo)紋(wen)涵(han)(han)管洞(dong)(dong)(dong)由于軸向波(bo)(bo)紋(wen)的(de)存在(zai)使其具有(you)優良(liang)的(de)受力特征,軸向和徑(jing)向同時(shi)分(fen)布因荷載引起的(de)應力應變(bian)(bian),可以(yi)更大程度上分(fen)散荷載的(de)應力集中(zhong),更好地(di)發揮鋼(gang)結構的(de)優勢(shi)。尤(you)其在(zai)高(gao)寒凍土(tu)、軟(ruan)土(tu)、膨脹土(tu)、濕陷(xian)性黃土(tu)等地(di)帶(dai),具有(you)明顯的(de)經濟效益。
工法(fa)特點此工法(fa)操(cao)作簡單(dan),現場無(wu)需大型(xing)設(she)備,拼(pin)(pin)裝(zhuang)方法(fa)快(kuai)捷可有效縮短施工周(zhou)期(qi)。采用(yong)(yong)分片拼(pin)(pin)裝(zhuang)技術,不(bu)僅能方便涵管(guan)的(de)裝(zhuang)卸和(he)(he)運(yun)輸而且(qie)現場施工也易于(yu)操(cao)控。免除(chu)了(le)砼澆筑、鋼筋焊接(jie)等(deng)工序(xu),對周(zhou)邊(bian)噪聲污染較少(shao),而且(qie)舍棄了(le)常(chang)規建材(cai),如水泥、砂、石子、木材(cai)等(deng),其環(huan)保意義深遠。環(huan)形波紋(wen)鋼圓(yuan)管(guan)每節的(de)長度(du)(du)(du)和(he)(he)波紋(wen)鋼板(ban)(ban)(ban)件(jian)長度(du)(du)(du)和(he)(he)寬(kuan)度(du)(du)(du)根(gen)據鋼板(ban)(ban)(ban)尺寸及吊裝(zhuang)、運(yun)輸和(he)(he)拼(pin)(pin)裝(zhuang)條件(jian)等(deng)確(que)定(ding)。加工時,環(huan)形波紋(wen)鋼圓(yuan)管(guan)的(de)法(fa)蘭盤圓(yuan)周(zhou)邊(bian)均勻布(bu)設(she)單(dan)排螺栓孔(kong),孔(kong)位、孔(kong)距根(gen)據設(she)計(ji)確(que)定(ding)。波紋(wen)鋼板(ban)(ban)(ban)件(jian)根(gen)據設(she)計(ji)的(de)弧長、波形參數等(deng)確(que)定(ding)螺拴孔(kong)位,螺栓孔(kong)位置應偏離(li)更(geng)大應力集(ji)中區(qu)。波紋(wen)鋼板(ban)(ban)(ban)件(jian)拼(pin)(pin)裝(zhuang)時,板(ban)(ban)(ban)件(jian)之間(jian)應采用(yong)(yong)搭接(jie),并用(yong)(yong)高強度(du)(du)(du)螺栓連接(jie),不(bu)得采用(yong)(yong)焊接(jie)。
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