此后(hou)依(yi)此方(fang)式逐(zhu)節依(yi)次(ci)連接。管(guan)身底部兩側楔形部位(三角區)回填(tian)埋設于一般土質地基(ji)上的(de)波紋(wen)管(guan),常會時(shi)間性沉(chen)降(jiang),且(qie)往(wang)往(wang)管(guan)身中(zhong)部大(da)于兩端。考慮到水流要求(qiu)和結(jie)構整體性,應設置基(ji)礎的(de)縱向預留(liu)拱度(du),以實(shi)現管(guan)身預留(liu)拱度(du)。
安裝鋼波紋(wen)涵管對法蘭(lan)的間距(ju)有什么要求?
對于大直徑(jing)(3m以(yi)上)圓管(guan)(guan)涵,可(ke)采用素混凝土或氣(qi)泡混合輕質土回(hui)填,待其(qi)固(gu)化后再(zai)實(shi)(shi)行(xing)(xing)其(qi)外(wai)延部(bu)分的正常(chang)回(hui)填。對于多孔并列(lie)的圓管(guan)(guan)涵和(he)連(lian)跨的拱涵,因為空(kong)間原因管(guan)(guan)間距設置較小時,其(qi)管(guan)(guan)間空(kong)隙下部(bu)也可(ke)采用素混凝土或氣(qi)泡混合輕質土填實(shi)(shi),待其(qi)固(gu)化后再(zai)實(shi)(shi)行(xing)(xing)上部(bu)和(he)頂(ding)部(bu)的正常(chang)回(hui)填。
整裝波紋涵(han)(han)管安裝要求管身兩(liang)側和(he)管頂部回(hui)填縱向施工(gong)順序,可(ke)從(cong)涵(han)(han)洞中間至兩(liang)端(duan);對于兩(liang)端(duan)端(duan)墻已完成的(de)也可(ke)以(yi)從(cong)兩(liang)端(duan)向中間推進。管身更大(da)直徑兩(liang)側0.6m外可(ke)使(shi)用18T壓(ya)路(lu)機(ji)碾(nian)壓(ya),0.6m范圍內必須使(shi)用小(xiao)型(xing)夯(hang)實機(ji)械夯(hang)實,以(yi)避免壓(ya)路(lu)機(ji)等大(da)型(xing)機(ji)械設(she)備對管涵(han)(han)的(de)撞擊(ji)。
預留(liu)拱度大小根(gen)據地基(ji)土可能(neng)出現的下(xia)沉量、涵底縱(zong)(zong)坡(po)和填(tian)土高度等因素綜合考慮(lv),基(ji)礎在涵管縱(zong)(zong)向(xiang)預留(liu)拱度一般(ban)為(wei)0.5%~1%(一般(ban)情況下(xia)取0.6%),更大不(bu)宜大于2%,以確保管身中部(bu)不(bu)出現凹陷或縱(zong)(zong)向(xiang)滑移。
填(tian)筑(zhu)時(shi)應分(fen)層(ceng)(ceng)填(tian)筑(zhu)、分(fen)層(ceng)(ceng)壓實(shi),每層(ceng)(ceng)壓實(shi)后的(de)(de)厚度為20cm,壓實(shi)度要求達到96%方可進行下(xia)層(ceng)(ceng)填(tian)筑(zhu)。管(guan)身兩(liang)(liang)側分(fen)層(ceng)(ceng)壓實(shi)回(hui)填(tian)應同步(bu)對稱進行,兩(liang)(liang)側的(de)(de)回(hui)填(tian)土高度差不得大于30cm。對于多道(dao)橋涵平行排列的(de)(de),中間各道(dao)與兩(liang)(liang)側也(ye)應遵循同步(bu)對稱回(hui)填(tian)的(de)(de)原(yuan)則。
根(gen)據涵洞的(de)實際情況,排放涵管(guan)(guan)。安裝時從(cong)(cong)一(yi)側排放根(gen)管(guan)(guan)節,使其(qi)管(guan)(guan)子(zi)中心(xin)和基礎縱向中心(xin)線(xian)平(ping)行,同樣把(ba)第(di)二(er)根(gen)管(guan)(guan)放置就位(wei),當兩(liang)(liang)根(gen)管(guan)(guan)相鄰法蘭間相距3-5㎝的(de)縫隙時,用(yong)小撬棍(gun)對準(zhun)法蘭上的(de)螺(luo)(luo)(luo)栓孔,使其(qi)兩(liang)(liang)根(gen)管(guan)(guan)法蘭上的(de)螺(luo)(luo)(luo)栓孔對正,這是從(cong)(cong)第(di)二(er)節管(guan)(guan)的(de)另(ling)一(yi)端用(yong)撬杠撬動(dong)管(guan)(guan)節,使其(qi)縱向平(ping)移(yi),使兩(liang)(liang)法蘭間距在2㎝左右,然后(hou)全部穿上螺(luo)(luo)(luo)栓,擰上螺(luo)(luo)(luo)絲,但不要緊固螺(luo)(luo)(luo)栓,開(kai)始鑲嵌石棉墊。
一(yi)般回填規定運(yun)輸方便:整裝型金屬波紋涵管得重量只(zhi)有(you)同口(kou)徑水泥管的(de)1/10到1/5,即使在(zai)窄(zhai)的(de)場所(suo)沒有(you)運(yun)輸設備,人工也可運(yun)輸。超長的(de)使用壽命:采用熱浸鋅制作,使用壽命長達100年,在(zai)腐蝕(shi)性特別大的(de)環(huan)境下使用時采用內外表面瀝青附層的(de)鋼波紋管,可在(zai)原使用壽命基礎上(shang)有(you)更大提高。
當管頂回(hui)填土厚度超過50cm后,采用(yong)(yong)壓(ya)路機靜壓(ya);填土厚度超過60cm后,采用(yong)(yong)壓(ya)路機振壓(ya),壓(ya)實(shi)(shi)(shi)度不小于96%。采用(yong)(yong)粗砂(sha)“水密法”振蕩(dang)器密實(shi)(shi)(shi),或采用(yong)(yong)流態(tai)粉煤灰回(hui)填,或水泥漿體澆筑。也可選用(yong)(yong)更大粒徑(jing)不超過3cm的(de)級配碎石(shi)回(hui)填,用(yong)(yong)小型夯實(shi)(shi)(shi)機械斜向夯實(shi)(shi)(shi),確保管底回(hui)填質量。
回填(tian)(tian)(tian)土壓實(shi)(shi)度(du)涵(han)管(guan)兩(liang)側回填(tian)(tian)(tian)應采(cai)用(yong)砂礫或與路(lu)基填(tian)(tian)(tian)料(liao)相(xiang)同的(de)材料(liao)。涵(han)管(guan)兩(liang)側回填(tian)(tian)(tian)應對稱施工(gong),分(fen)層(ceng)回填(tian)(tian)(tian),每層(ceng)厚(hou)度(du)為20cm。涵(han)管(guan)兩(liang)側近處用(yong)機械夯(hang)實(shi)(shi),管(guan)底下方粗砂用(yong)“水密(mi)(mi)法(fa)”震蕩(dang)器(qi)振實(shi)(shi)。涵(han)管(guan)兩(liang)側回填(tian)(tian)(tian)應采(cai)用(yong)振動夯(hang)實(shi)(shi)機逐層(ceng)夯(hang)實(shi)(shi)。密(mi)(mi)實(shi)(shi)度(du)不小(xiao)于96%。
鑲石(shi)(shi)棉(mian)(mian)墊(dian):由于現場地勢等原因,有時(shi)(shi)相鄰兩(liang)(liang)法(fa)蘭(lan)之(zhi)(zhi)間(jian)(jian)(jian)間(jian)(jian)(jian)距較(jiao)小(xiao),這時(shi)(shi)用手錘、鑿子把(ba)(ba)兩(liang)(liang)法(fa)蘭(lan)之(zhi)(zhi)間(jian)(jian)(jian)鑿開(kai)大約1㎝的縫隙(xi),用螺(luo)絲刀把(ba)(ba)石(shi)(shi)棉(mian)(mian)墊(dian)鑲在(zai)(zai)(zai)兩(liang)(liang)法(fa)蘭(lan)之(zhi)(zhi)間(jian)(jian)(jian),(石(shi)(shi)棉(mian)(mian)墊(dian)鑲在(zai)(zai)(zai)螺(luo)栓內側(ce))有時(shi)(shi)管(guan)子頂部兩(liang)(liang)法(fa)蘭(lan)間(jian)(jian)(jian)距較(jiao)大,石(shi)(shi)棉(mian)(mian)墊(dian)鑲嵌(qian)困難,用綁絲把(ba)(ba)石(shi)(shi)棉(mian)(mian)墊(dian)綁在(zai)(zai)(zai)螺(luo)栓上(shang)固(gu)定(ding),然后(hou)工人開(kai)始對稱鎖緊螺(luo)絲。
直至從外觀看兩法(fa)蘭之間只(zhi)有2-5㎜的(de)(de)(de)(de)縫隙(xi)即可(ke)。優良的(de)(de)(de)(de)經(jing)濟特性:連接方式簡(jian)便(bian),可(ke)縮短工(gong)(gong)(gong)(gong)期;較(jiao)輕,運輸方便(bian),外加少量的(de)(de)(de)(de)基礎施工(gong)(gong)(gong)(gong),排水(shui)(shui)管(guan)道工(gong)(gong)(gong)(gong)程費(fei)用(yong)相(xiang)對較(jiao)低如以直徑600mm波(bo)紋管(guan)的(de)(de)(de)(de)施工(gong)(gong)(gong)(gong)費(fei)與水(shui)(shui)泥管(guan)得(de)施工(gong)(gong)(gong)(gong)費(fei)相(xiang)比較(jiao),整裝型金屬波(bo)紋涵管(guan)的(de)(de)(de)(de)施工(gong)(gong)(gong)(gong)費(fei)用(yong)只(zhi)需要水(shui)(shui)泥管(guan)施工(gong)(gong)(gong)(gong)費(fei)的(de)(de)(de)(de)90%左右(you)在(zai)交通不方便(bian)的(de)(de)(de)(de)地方施工(gong)(gong)(gong)(gong)時,用(yong)人工(gong)(gong)(gong)(gong)即可(ke),節省(sheng)了叉(cha)車,吊車等機械設備的(de)(de)(de)(de)費(fei)用(yong)。想了解更多關于鋼波(bo)紋涵管(guan)的(de)(de)(de)(de)新(xin)聞(wen)動(dong)態請點擊(ji):hanihanbj.com
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