通過對已建成的鋼波紋管進行質量檢查(cha)發現,管座墊(dian)層(ceng)混(hun)凝(ning)土強度知足(zu)混(hun)凝(ning)土抗(kang)壓評定,墊(dian)層(ceng)寬(kuan)度及厚度知足(zu)設(she)計(ji)要求(qiu),相鄰管節(jie)底面錯臺也均知足(zu)要求(qiu);外觀(guan)管壁豎直(zhi),接縫平(ping)整,填縫豐滿,施工質量合格。

鋼波紋管施工完畢之后應該重點檢查哪些地方？

護(hu)坡防護(hu)洞口設(she)計(ji)采用端墻形(xing)式。洞口鋪砌及護(hu)坡防護(hu)為M7.5漿砌片石(shi)(shi),應(ying)選(xuan)擇幾何尺(chi)寸相對(dui)長和(he)短的(de)石(shi)(shi)塊(kuai)交錯(cuo)(cuo)在統一層使之(zhi)形(xing)成錯(cuo)(cuo)鎖結(jie)構,保證錯(cuo)(cuo)縫(feng)(feng)砌筑(zhu),不得(de)泛起(qi)豎縫(feng)(feng)、通縫(feng)(feng)。外(wai)露(lu)面(mian)要選(xuan)擇石(shi)(shi)塊(kuai)質(zhi)地適當,細致(zhi)光彩平均,無風化剝(bo)落(luo)無裂(lie)紋(wen)的(de)大石(shi)(shi)塊(kuai)進行鑿(zao)面(mian)鑿(zao)紋(wen),以確保工程外(wai)露(lu)面(mian)的(de)平整(zheng)和(he)正確的(de)幾何尺(chi)寸,輪廓要求清楚,線(xian)條(tiao)直順柔美,并勾凹縫(feng)(feng)。

填(tian)筑必需在涵管兩側(ce)同步對稱進行,兩側(ce)的回填(tian)土(tu)高差以不超過(guo)兩側(ce)土(tu)為宜。涵洞(dong)上方回填(tian)厚(hou)度(du)(du)小(xiao)(xiao)于(yu)(yu)50cm時采用(yong)手扶振動壓(ya)(ya)路(lu)機壓(ya)(ya)實(shi)或用(yong)小(xiao)(xiao)于(yu)(yu)6t的靜碾(nian)壓(ya)(ya)路(lu)機壓(ya)(ya)實(shi),壓(ya)(ya)實(shi)度(du)(du)不小(xiao)(xiao)于(yu)(yu)95%。當(dang)通道頂(ding)填(tian)土(tu)大于(yu)(yu)50cm后,方可(ke)采用(yong)YZ20壓(ya)(ya)路(lu)機施工(gong),每層厚(hou)度(du)(du)20cm,壓(ya)(ya)實(shi)度(du)(du)不小(xiao)(xiao)于(yu)(yu)95%。

涵背兩側(ce)的部位回填(tian)采用(yong)級(ji)配良(liang)好(hao)的自然砂礫或粗(cu)砂,使用(yong)小型(xing)夯實(shi)(shi)機械夯實(shi)(shi)。填(tian)筑時應(ying)分層填(tian)筑、分層壓實(shi)(shi),松(song)鋪厚度(du)(du)為15cm,壓實(shi)(shi)度(du)(du)要求達(da)到96%方(fang)可進行下層填(tian)筑。填(tian)筑前在管節兩側(ce)用(yong)紅色油漆按(an)每15m高度(du)(du)標(biao)(biao)注,填(tian)筑時按(an)標(biao)(biao)注線控制。

為保證鋼波紋管底(di)的回填(tian)質(zhi)量,管(guan)底(di)楔形(xing)塊(kuai)處(chu)的填(tian)筑材料采(cai)用(yong)級(ji)配良好的自然砂礫(li)或粗砂(含(han)水量要(yao)求為更佳含(han)水量2%左(zuo)(zuo)右),人工用(yong)木(mu)棒(bang)(bang)在管(guan)身外向(xiang)內側進行夯實(shi),木(mu)棒(bang)(bang)的截(jie)面尺寸為15cm??15cm左(zuo)(zuo)右,木(mu)棒(bang)(bang)單次沖擊力應達(da)到9kg,木(mu)棒(bang)(bang)作用(yong)點必(bi)需緊貼管(guan)身,每個凹(ao)槽部(bu)位(wei)都(dou)必(bi)需夯實(shi)到位(wei),然后用(yong)小型夯實(shi)機(ji)械(xie)斜向(xiang)夯實(shi),確(que)保管(guan)底(di)的回填(tian)質(zhi)量。