通過對已建成的鋼波紋管進行質量檢查發現(xian),管座墊層混(hun)凝(ning)土(tu)強度(du)(du)知足混(hun)凝(ning)土(tu)抗壓(ya)評(ping)定,墊層寬度(du)(du)及厚度(du)(du)知足設計要求,相鄰管節底面錯臺也均知足要求;外觀管壁(bi)豎(shu)直(zhi),接縫平整(zheng),填縫豐滿(man),施(shi)工(gong)質量合格(ge)。

鋼波紋管施工完畢之后應該重點檢查哪些地方？

護坡(po)(po)防護洞(dong)口(kou)設(she)計采用端墻形式(shi)。洞(dong)口(kou)鋪砌(qi)(qi)及護坡(po)(po)防護為M7.5漿砌(qi)(qi)片(pian)石,應(ying)選擇(ze)(ze)幾(ji)(ji)何尺寸相對(dui)長和短的石塊(kuai)交錯(cuo)在統一層使(shi)之(zhi)形成錯(cuo)鎖結構,保(bao)(bao)證錯(cuo)縫(feng)砌(qi)(qi)筑(zhu),不得泛起豎縫(feng)、通縫(feng)。外露面要選擇(ze)(ze)石塊(kuai)質地適當,細致光彩平(ping)(ping)均,無風化剝(bo)落無裂紋的大石塊(kuai)進行(xing)鑿面鑿紋,以確(que)保(bao)(bao)工程外露面的平(ping)(ping)整和正確(que)的幾(ji)(ji)何尺寸,輪廓(kuo)要求清楚(chu),線條(tiao)直順柔(rou)美,并(bing)勾(gou)凹縫(feng)。

填(tian)筑必需在涵管兩(liang)側(ce)(ce)同步(bu)對稱進(jin)行,兩(liang)側(ce)(ce)的回填(tian)土(tu)(tu)高差以(yi)不(bu)超過(guo)兩(liang)側(ce)(ce)土(tu)(tu)為宜。涵洞上方回填(tian)厚度(du)小于50cm時采用手扶振(zhen)動壓(ya)(ya)(ya)路(lu)(lu)機壓(ya)(ya)(ya)實或用小于6t的靜碾(nian)壓(ya)(ya)(ya)路(lu)(lu)機壓(ya)(ya)(ya)實,壓(ya)(ya)(ya)實度(du)不(bu)小于95%。當(dang)通道(dao)頂填(tian)土(tu)(tu)大于50cm后,方可采用YZ20壓(ya)(ya)(ya)路(lu)(lu)機施工,每層厚度(du)20cm,壓(ya)(ya)(ya)實度(du)不(bu)小于95%。

涵背(bei)兩側的部位(wei)回填(tian)(tian)采用(yong)級配(pei)良好(hao)的自(zi)然砂礫或粗砂,使用(yong)小型夯實機械夯實。填(tian)(tian)筑時應(ying)分層填(tian)(tian)筑、分層壓實,松鋪(pu)厚度(du)為15cm,壓實度(du)要求達到96%方可進行下層填(tian)(tian)筑。填(tian)(tian)筑前在管節(jie)兩側用(yong)紅色油漆按(an)每(mei)15m高(gao)度(du)標(biao)注,填(tian)(tian)筑時按(an)標(biao)注線控制。

為保證鋼波紋管底(di)(di)的回填(tian)質量(liang),管(guan)底(di)(di)楔形塊(kuai)處的填(tian)筑材料采用(yong)(yong)級配良好的自然砂(sha)礫(li)或(huo)粗砂(sha)(含水量(liang)要求(qiu)為(wei)更佳含水量(liang)2%左右(you)),人工用(yong)(yong)木(mu)棒(bang)在(zai)管(guan)身外向(xiang)內側進行夯(hang)(hang)實(shi)(shi),木(mu)棒(bang)的截(jie)面尺寸為(wei)15cm??15cm左右(you),木(mu)棒(bang)單(dan)次沖擊力應達(da)到(dao)9kg,木(mu)棒(bang)作用(yong)(yong)點必需緊貼(tie)管(guan)身,每個凹(ao)槽部位都必需夯(hang)(hang)實(shi)(shi)到(dao)位,然后用(yong)(yong)小型(xing)夯(hang)(hang)實(shi)(shi)機械斜向(xiang)夯(hang)(hang)實(shi)(shi),確(que)保管(guan)底(di)(di)的回填(tian)質量(liang)。