通過對已建成的鋼波紋管進行質量檢(jian)查發現,管座墊層(ceng)混(hun)凝(ning)土(tu)強度知(zhi)足混(hun)凝(ning)土(tu)抗壓評定,墊層(ceng)寬度及厚度知(zhi)足設計要求(qiu),相(xiang)鄰(lin)管節底(di)面錯臺(tai)也均知(zhi)足要求(qiu);外觀管壁豎直,接(jie)縫平整,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？

護坡防(fang)護洞(dong)口(kou)設計采用端墻形(xing)式。洞(dong)口(kou)鋪砌(qi)及(ji)護坡防(fang)護為(wei)M7.5漿砌(qi)片石(shi)(shi),應選擇(ze)幾(ji)何尺(chi)寸相對長和(he)短的石(shi)(shi)塊交錯在統一層使之形(xing)成錯鎖結構,保證錯縫(feng)砌(qi)筑(zhu),不得(de)泛起豎縫(feng)、通縫(feng)。外露面(mian)要選擇(ze)石(shi)(shi)塊質地適(shi)當,細致光彩平均,無(wu)風化剝(bo)落無(wu)裂(lie)紋的大石(shi)(shi)塊進行鑿面(mian)鑿紋,以確保工(gong)程外露面(mian)的平整(zheng)和(he)正確的幾(ji)何尺(chi)寸,輪廓(kuo)要求清楚(chu),線條直順柔美,并勾凹縫(feng)。

填(tian)筑必(bi)需(xu)在涵(han)管兩側(ce)同步對(dui)稱進(jin)行,兩側(ce)的回(hui)填(tian)土(tu)(tu)(tu)高差(cha)以不超過兩側(ce)土(tu)(tu)(tu)為宜。涵(han)洞上方回(hui)填(tian)厚度(du)(du)小(xiao)(xiao)于50cm時采用手扶振動壓(ya)路機壓(ya)實(shi)(shi)或用小(xiao)(xiao)于6t的靜碾(nian)壓(ya)路機壓(ya)實(shi)(shi),壓(ya)實(shi)(shi)度(du)(du)不小(xiao)(xiao)于95%。當通(tong)道頂填(tian)土(tu)(tu)(tu)大于50cm后,方可采用YZ20壓(ya)路機施工(gong),每(mei)層厚度(du)(du)20cm,壓(ya)實(shi)(shi)度(du)(du)不小(xiao)(xiao)于95%。

涵背兩側的部(bu)位回填(tian)(tian)(tian)采用級配良好的自然(ran)砂礫或粗砂,使(shi)用小型夯(hang)實機(ji)械夯(hang)實。填(tian)(tian)(tian)筑(zhu)(zhu)時應分層(ceng)填(tian)(tian)(tian)筑(zhu)(zhu)、分層(ceng)壓實,松鋪厚度(du)為(wei)15cm,壓實度(du)要求達到96%方可進(jin)行下層(ceng)填(tian)(tian)(tian)筑(zhu)(zhu)。填(tian)(tian)(tian)筑(zhu)(zhu)前在(zai)管(guan)節兩側用紅色油漆按每15m高度(du)標注(zhu),填(tian)(tian)(tian)筑(zhu)(zhu)時按標注(zhu)線控制。

為保證鋼波紋管底(di)的(de)(de)回(hui)填質量(liang)(liang),管(guan)(guan)底(di)楔形塊處的(de)(de)填筑材料采用(yong)級(ji)配良好(hao)的(de)(de)自然(ran)砂(sha)礫(li)或(huo)粗砂(sha)(含水量(liang)(liang)要求為更佳含水量(liang)(liang)2%左右),人(ren)工用(yong)木(mu)棒(bang)在管(guan)(guan)身(shen)(shen)外向內側進行夯(hang)實,木(mu)棒(bang)的(de)(de)截面尺寸為15cm??15cm左右,木(mu)棒(bang)單次沖擊力應達到9kg,木(mu)棒(bang)作用(yong)點必(bi)需緊貼管(guan)(guan)身(shen)(shen),每個凹槽部位都(dou)必(bi)需夯(hang)實到位,然(ran)后用(yong)小(xiao)型(xing)夯(hang)實機械斜向夯(hang)實,確(que)保管(guan)(guan)底(di)的(de)(de)回(hui)填質量(liang)(liang)。