鋼波紋管兩側不對稱回填(tian)導(dao)致(zhi)(zhi)鴨蛋(dan)圓,嚴(yan)重的導(dao)致(zhi)(zhi)塌垮(kua)。楔形(xing)部回填(tian)不密實,導(dao)致(zhi)(zhi)管(guan)體底部變平(ping)。波紋涵管(guan)兩側填(tian)土不密實,導(dao)致(zhi)(zhi)變形(xing)過大(da)。
這樣做鋼波紋管的防腐工作效果非常好
瀝青(qing)與煤油的(de)(de)拌和物涂(tu)(tu)(tu)料(liao):涂(tu)(tu)(tu)料(liao)瀝青(qing)與煤油之配合比為(wei)54: 46,使用(yong)此(ci)涂(tu)(tu)(tu)料(liao)時(shi)應(ying)涂(tu)(tu)(tu)刷2遍,使涂(tu)(tu)(tu)刷層總厚(hou)度達到0.4mm—0.5mm,涂(tu)(tu)(tu)刷用(yong)量(liang)0.6kg/m2。有條件時(shi)用(yong)噴(pen)槍噴(pen)涂(tu)(tu)(tu),效(xiao)果(guo)更好,涂(tu)(tu)(tu)刷在(zai)廢水(shui)浸泡或常水(shui)位以下部分的(de)(de)鋼波(bo)紋涵管。
一些(xie)個別的小公司不(bu)注重(zhong)回填部分,因此波紋涵管受到嚴重(zhong)損壞,管身變形的事(shi)情(qing)也偶爾發生(sheng),下(xia)面簡單列舉五(wu)種情(qing)形,希望在施(shi)工過程(cheng)中加(jia)強管理,引(yin)起(qi)高度重(zhong)視:
體楔形部(bu)及兩側局(ju)部(bu)有大石塊,導致(zhi)局(ju)部(bu)波紋涵管(guan)有硬(ying)割傷或(huo)凸起。管(guan)體50cm內兩側回填(tian)材(cai)料(liao)達不到要求,應填(tian)沙(sha)性(xing)材(cai)料(liao),施工(gong)時卻填(tian)筑了(le)黃土(tu)、膨脹土(tu)等材(cai)料(liao),遇水變軟,無承載(zai)能(neng)力(li),導致(zhi)管(guan)體橫向變形過大。
鋼(gang)波(bo)(bo)紋涵管是由(you)鋼(gang)板制成(cheng)波(bo)(bo)形板后(hou)卷扎(zha)而(er)成(cheng)或者拼(pin)裝而(er)成(cheng)的涵洞(dong)用(yong)(yong)管,應用(yong)(yong)于公(gong)(gong)(gong)路(lu)、鐵路(lu)涵洞(dong)等(deng)工(gong)程(cheng)(cheng)(cheng),也可以半圓或其他曲線方(fang)式做(zuo)成(cheng)跨線通(tong)道(dao)、隧道(dao)和巷道(dao)頂護。鋼(gang)波(bo)(bo)紋涵管沿管長方(fang)向(xiang)呈波(bo)(bo)形,有非常強的適應縱(zong)向(xiang)變形能(neng)(neng)力,能(neng)(neng)避免因地(di)基不(bu)均勻(yun)沉(chen)降從(cong)而(er)造成(cheng)破壞,在不(bu)增加材(cai)料用(yong)(yong)量的情(qing)況下,可以將管的徑向(xiang)承載(zai)能(neng)(neng)力提高數倍,由(you)于其優越(yue)的性能(neng)(neng)和適應能(neng)(neng)力被國外用(yong)(yong)于公(gong)(gong)(gong)路(lu)工(gong)程(cheng)(cheng)(cheng)、鐵路(lu)工(gong)程(cheng)(cheng)(cheng)、礦山巷道(dao)、隧道(dao)工(gong)程(cheng)(cheng)(cheng)、市(shi)(shi)政(zheng)工(gong)程(cheng)(cheng)(cheng)和軍事通(tong)道(dao)。國內(nei)使用(yong)(yong)推廣波(bo)(bo)紋涵管技術,是2000年以后(hou)由(you)上海市(shi)(shi)公(gong)(gong)(gong)路(lu)管理處、上海市(shi)(shi)政(zheng)設計研究院、同(tong)濟大學、衡水益通(tong)公(gong)(gong)(gong)司等(deng)單位共(gong)同(tong)推動,2001-2006年在新(xin)疆、西藏、河(he)北、山西、內(nei)蒙等(deng)省(sheng)份多(duo)條高等(deng)級公(gong)(gong)(gong)路(lu)上應用(yong)(yong),用(yong)(yong)戶普遍(bian)反映良好(hao)。
鋼波紋管力(li)(li)學原理 鋼波紋管(guan)周(zhou)圍土體在(zai)(zai)荷(he)載(zai)作(zuo)用下形(xing)成支(zhi)(zhi)撐(cheng),土體與波紋管(guan)形(xing)成一種(zhong)組合結構(gou),使波紋管(guan)能夠承受很(hen)大的(de)(de)(de)承載(zai)能力(li)(li)。鋼波紋管(guan)沿(yan)直徑(jing)(jing)方向為圓形(xing)或(huo)拱(gong)形(xing),而縱向又是若(ruo)干個小(xiao)波紋拱(gong),縱橫組成雙曲拱(gong),與我國雙曲拱(gong)橋的(de)(de)(de)性質類似(si),由力(li)(li)學可知,拱(gong)式在(zai)(zai)豎向荷(he)載(zai)作(zuo)用下,支(zhi)(zhi)撐(cheng)處(chu)不僅產生(sheng)豎向反力(li)(li),而且產生(sheng)水(shui)(shui)平推力(li)(li),由于水(shui)(shui)平推力(li)(li)的(de)(de)(de)存(cun)在(zai)(zai),拱(gong)的(de)(de)(de)彎(wan)距將比相(xiang)同跨徑(jing)(jing)的(de)(de)(de)梁或(huo)橋的(de)(de)(de)彎(wan)距小(xiao)很(hen)多(duo),而使整個拱(gong)主要承受壓力(li)(li),波紋管(guan)涵(han)四周(zhou)有若(ruo)干個支(zhi)(zhi)撐(cheng)點(dian),形(xing)成穩定的(de)(de)(de)承載(zai)能力(li)(li)。
鋼波紋涵管(guan)應(ying)該涂(tu)(tu)涮兩遍瀝(li)青(qing)和石(shi)油的拌和物,以加強防腐蝕作用。從外觀看管(guan)壁內外均勻的涂(tu)(tu)成了(le)黑管(guan)即可,但(dan)是必須要等到瀝(li)青(qing)晾干后方(fang)可安(an)裝。瀝(li)青(qing)涂(tu)(tu)層的厚度(du)保持在0.4—0.5mm內。
涂(tu)(tu)涮方(fang)法(fa)如下: 含有石棉纖維的(de)厚(hou)瀝(li)青(qing)涂(tu)(tu)料:涂(tu)(tu)料的(de)溶(rong)劑(ji)是高質量的(de)瀝(li)青(qing),石棉粉(fen)的(de)含量≥30%。噴(pen)涂(tu)(tu)方(fang)法(fa)可(ke)用氣壓噴(pen)涂(tu)(tu),或毛刷涂(tu)(tu)刷,每次噴(pen)涂(tu)(tu)層厚(hou)7mm—8mm,噴(pen)涂(tu)(tu)用量為lkg/m2左右。被噴(pen)涂(tu)(tu)物表面應特(te)別干爽,無油污。涂(tu)(tu)刷在廢水浸泡或常水位以(yi)下部分的(de)鋼波紋涵(han)管。
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