南方南!南方高填土鋼波紋涵管設計(ji)經驗(yan)無償奉(feng)送!衡水浩威新材料有限公司產品出廠合格率高,過(guo)硬(ying)的技術是我(wo)們自(zi)信的資(zi)本(ben),7X24完善的售后(hou)服務,使市(shi)場占(zhan)有率逐年攀升(sheng)。
首先說(shuo),南(nan)方地區(qu)雨水充沛,地下水豐富,軟土分布(bu)(bu),做好(hao)涵洞基(ji)礎及臺背回(hui)填對(dui)于(yu)鋼(gang)(gang)波紋涵管(guan)整體穩定及防(fang)水尤為(wei)重(zhong)要(yao)。地基(ji)要(yao)對(dui)整個鋼(gang)(gang)波紋涵管(guan)保持均勻的(de)承載力,要(yao)避免軟弱基(ji)和(he)巖基(ji)交叉的(de)地基(ji),如果不(bu)(bu)可(ke)避免軟弱地基(ji),要(yao)用(yong)優(you)質(zhi)砂(sha)(sha)石及礫(li)石壓實(shi)成型(xing),盡(jin)量減少整個區(qu)間的(de)變位量。基(ji)礎厚度從鋼(gang)(gang)波紋涵管(guan)的(de)底部算起以80cm左右為(wei)宜,用(yong)透(tou)水性好(hao)、粒度分布(bu)(bu)良好(hao)的(de)砂(sha)(sha)礫(li)或(huo)(huo)碎石成型(xing)。材(cai)料的(de)更(geng)大粒徑不(bu)(bu)得(de)超過波長(chang)的(de)1/2。鋼(gang)(gang)波紋涵管(guan)臺背宜采(cai)用(yong)砂(sha)(sha)礫(li)或(huo)(huo)碎石進行(xing)回(hui)填,兩側回(hui)填應同時(shi)進行(xing),壓實(shi)落差應小于(yu)20cm。因偏壓造(zao)成鋼(gang)(gang)波紋涵管(guan)變形時(shi),應修正截面變形后重(zhong)新壓實(shi)。
然(ran)后說,加(jia)(jia)強(qiang)(qiang)防(fang)(fang)腐防(fang)(fang)沖(chong)(chong)(chong)(chong)(chong)刷(shua)(shua)設計。南方(fang)地(di)區(qu)地(di)下水(shui)多帶有不(bu)(bu)同(tong)程度(du)(du)的(de)(de)腐蝕性,同(tong)時(shi)山(shan)嶺重丘地(di)區(qu)地(di)表水(shui)流湍急,季節性降(jiang)雨(yu)沖(chong)(chong)(chong)(chong)(chong)刷(shua)(shua)嚴重。因此(ci),鋼波紋涵(han)管(guan)(guan)的(de)(de)防(fang)(fang)腐及防(fang)(fang)沖(chong)(chong)(chong)(chong)(chong)刷(shua)(shua)設計應重點考(kao)慮。在涵(han)洞(dong)內(nei)(nei)外(wai)壁(bi)熱鍍鋅層嚴格(ge)按照(zhao)相關標準控制的(de)(de)基礎上(shang),可(ke)(ke)(ke)(ke)采用(yong)如下措施(shi)加(jia)(jia)強(qiang)(qiang)涵(han)洞(dong)的(de)(de)防(fang)(fang)腐及防(fang)(fang)沖(chong)(chong)(chong)(chong)(chong)刷(shua)(shua)能(neng)(neng)力:1)對腐蝕及沖(chong)(chong)(chong)(chong)(chong)刷(shua)(shua)不(bu)(bu)嚴重的(de)(de)場(chang)合(he)(he),可(ke)(ke)(ke)(ke)在鋼波紋管(guan)(guan)內(nei)(nei)外(wai)壁(bi)增(zeng)加(jia)(jia)熱涂瀝(li)青層2道,每道厚約1.5mm,瀝(li)青涂抹需在回填之前進行。該措施(shi)也可(ke)(ke)(ke)(ke)增(zeng)強(qiang)(qiang)涵(han)洞(dong)的(de)(de)防(fang)(fang)水(shui)功能(neng)(neng)。2)對腐蝕及沖(chong)(chong)(chong)(chong)(chong)刷(shua)(shua)較(jiao)為嚴重的(de)(de)場(chang)合(he)(he),除在外(wai)壁(bi)增(zeng)加(jia)(jia)2道熱涂瀝(li)青層外(wai),可(ke)(ke)(ke)(ke)考(kao)慮在管(guan)(guan)內(nei)(nei)壁(bi)包裹(guo)一層 C25細石(shi)砼(tong)(tong),更能(neng)(neng)加(jia)(jia)強(qiang)(qiang)涵(han)洞(dong)受水(shui)流沖(chong)(chong)(chong)(chong)(chong)刷(shua)(shua)的(de)(de)能(neng)(neng)力,確(que)保對涵(han)管(guan)(guan)管(guan)(guan)壁(bi)的(de)(de)保護。C25細石(shi)砼(tong)(tong)體積配合(he)(he)比為水(shui)泥(ni)∶砂子∶ 石(shi)子=1∶1.16∶2.93,加(jia)(jia)水(shui)混合(he)(he)均勻后澆(jiao)筑在管(guan)(guan)內(nei)(nei)壁(bi)一定高度(du)(du)的(de)(de)圓弧(hu)內(nei)(nei),澆(jiao)筑厚度(du)(du)為高出(chu)波峰3cm,抹平即(ji)可(ke)(ke)(ke)(ke)。細石(shi)砼(tong)(tong)粘附力很強(qiang)(qiang),能(neng)(neng)滿足水(shui)流及砂石(shi)的(de)(de)沖(chong)(chong)(chong)(chong)(chong)刷(shua)(shua)要求。此(ci)外(wai),也可(ke)(ke)(ke)(ke)考(kao)慮管(guan)(guan)身內(nei)(nei)壁(bi)鋪(pu)設復(fu)合(he)(he)水(shui)泥(ni)砂漿鋼絲網保護層的(de)(de)做法,要求小厚度(du)(du)不(bu)(bu)小于5cm。但此(ci)法施(shi)工較(jiao)為困難(nan),不(bu)(bu)推薦采用(yong)。
再者(zhe)說,鋼(gang)波紋涵管(guan)采(cai)用(yong)工廠標準(zhun)化(hua)生(sheng)產(chan),通常涵頂(ding)(ding)填土(tu)高(gao)(gao)(gao)度與鋼(gang)管(guan)厚度、波高(gao)(gao)(gao)等參數(shu)規(gui)格有(you)明確的對應關系。而(er)山(shan)區(qu)高(gao)(gao)(gao)速公路涵洞(dong)較長,如果某(mou)一座涵洞(dong)涵頂(ding)(ding)填土(tu)高(gao)(gao)(gao)度位于兩種涵洞(dong)規(gui)格臨(lin)界處(chu),則(ze)采(cai)用(yong)高(gao)(gao)(gao)或低(di)標準(zhun)生(sheng)產(chan)通常會(hui)有(you)幾十萬(wan)元(yuan)的價格差別。在這(zhe)種情況下,建(jian)議(yi)在低(di)標準(zhun)的基(ji)礎上(shang)采(cai)用(yong)局部增設加(jia)強(qiang)肋(lei)的做(zuo)法以達到既能保證波紋管(guan)涵在施工過程(cheng)及后期運營(ying)的安全(quan)要求,又節約造價的目的。具(ju)體(ti)做(zuo)法如圖3所(suo)示(shi),在管(guan)頂(ding)(ding)填高(gao)(gao)(gao)超過(H-3)m范圍內的管(guan)身(shen)頂(ding)(ding)部設置加(jia)強(qiang)肋(lei),加(jia)強(qiang)肋(lei)在圖示(shi)范圍內沿(yan)洞(dong)身(shen)每2m(中心(xin)間隔)設置1道(dao),加(jia)強(qiang)肋(lei)是圓心(xin)角為225°的鋼(gang)波紋管(guan)(型(xing)號(hao)與涵洞(dong)洞(dong)身(shen)所(suo)采(cai)用(yong)的鋼(gang)波紋管(guan)型(xing)號(hao)相同(tong))圓弧(hu)片。
后說,鋼波紋涵管洞(dong)基礎施工(gong)時應在基礎上(shang)縱
向(xiang)預留0.3%~1%的(de)(de)預拱(gong)度(du)。埋(mai)設于(yu)一(yi)(yi)般土(tu)質地(di)基上(shang)(shang)的(de)(de)鋼波紋(wen)管(guan),經過一(yi)(yi)段時(shi)間(jian)后常會產生一(yi)(yi)定的(de)(de)下(xia)沉,而且下(xia)沉量(liang)通(tong)常是管(guan)道中(zhong)(zhong)部(bu)大(da)(da)于(yu)兩端。因此,敷設于(yu)路堤下(xia)的(de)(de)鋼波紋(wen)管(guan)管(guan)身要設置中(zhong)(zhong)部(bu)向(xiang)上(shang)(shang)的(de)(de)預拱(gong)度(du)。預拱(gong)度(du)大(da)(da)小根據地(di)基可能出現(xian)(xian)的(de)(de)下(xia)沉量(liang)、涵底縱坡和填土(tu)高(gao)度(du)等因素綜合考慮,通(tong)常為(wei)管(guan)長(chang)的(de)(de)0.3%~1%,更大(da)(da)不超過2%,以(yi)確保管(guan)道中(zhong)(zhong)部(bu)不出現(xian)(xian)凹(ao)陷(xian)或滑坡。
分享此文章: |
版權所有:衡水浩威(wei)新材(cai)料有限公司 ICP備案(an)/許可(ke)證號: 技(ji)術支持: