鋼波紋管涵施工技術要求？

（1）挖基

按設計(ji)(ji)要(yao)求(qiu)在鋼波紋涵管投影線(xian)向外延伸2m范圍開挖基(ji)(ji)坑，一般情況下(xia)基(ji)(ji)坑按設計(ji)(ji)開挖完成后(hou)不(bu)得長(chang)期暴露、擾動和雨(yu)水浸泡，對地(di)(di)基(ji)(ji)承載力(li)滿足(zu)不(bu)了設計(ji)(ji)要(yao)求(qiu)的需采用換(huan)填或其他(ta)措施對地(di)(di)基(ji)(ji)進行(xing)處(chu)理至滿足(zu)要(yao)求(qiu)后(hou)立(li)即(ji)組織(zhi)進行(xing)基(ji)(ji)礎施工。

（2）基礎

鋼波紋管涵(han)基礎一般分(fen)為兩層(ceng)(ceng)，較大粒徑沙礫或(huo)碎石土(tu)基層(ceng)(ceng)和(he)(he)大粒徑不大于12cm的(de)級配沙礫墊層(ceng)(ceng)。在(zai)基礎的(de)施工(gong)中(zhong)，應根(gen)據(ju)地(di)基及其(qi)它相(xiang)(xiang)關工(gong)程情況，基礎在(zai)涵(han)管的(de)縱向(xiang)設置0.5%~1.0%的(de)預拱度。基礎墊層(ceng)(ceng)的(de)壓實度不易過大，造成涵(han)管兩側和(he)(he)管底回填(tian)料壓實度相(xiang)(xiang)差過大，帶來管身部(bu)分(fen)位置應力集中(zhong)。

鋼波紋管涵

（3）管身安裝

a．鋼波(bo)紋管涵(han)波(bo)形管節(jie)、塊件和(he)螺栓(shuan)應(ying)采用合格產品，滿足(zu)行業規范、標(biao)準等規定和(he)設計要求。

b．管(guan)(guan)(guan)(guan)身安(an)裝(zhuang)前準確放(fang)出涵(han)管(guan)(guan)(guan)(guan)的位置、中(zhong)軸(zhou)線(xian)，核查管(guan)(guan)(guan)(guan)涵(han)底部平(ping)整度、標高，按照設計的軸(zhou)線(xian)和圖(tu)紙要(yao)求進(jin)(jin)行(xing)敷(fu)設。波紋管(guan)(guan)(guan)(guan)涵(han)管(guan)(guan)(guan)(guan)身的拼接環形(xing)圈由上向下順次連(lian)(lian)接，整體成型后再進(jin)(jin)行(xing)縱向連(lian)(lian)接，由涵(han)管(guan)(guan)(guan)(guan)中(zhong)心(xin)向兩(liang)端對(dui)稱(cheng)進(jin)(jin)行(xing)安(an)裝(zhuang)。先安(an)裝(zhuang)中(zhong)間管(guan)(guan)(guan)(guan)節，安(an)裝(zhuang)完(wan)成后，測定已安(an)裝(zhuang)管(guan)(guan)(guan)(guan)節的截面(mian)形(xing)狀，校正(zheng)就位后，依(yi)次進(jin)(jin)行(xing)兩(liang)側(ce)進(jin)(jin)出水口安(an)裝(zhuang)。

c．為使波紋(wen)管(guan)涵(han)受(shou)力均(jun)勻、確保(bao)涵(han)洞段路基的填(tian)筑(zhu)質量(liang)，涵(han)管(guan)兩側、管(guan)頂上方50cm范圍的填(tian)筑(zhu)材料應按(an)設(she)計級配嚴格備(bei)料。回填(tian)施(shi)工(gong)(gong)(gong)應按(an)設(she)計的分層厚度(du)、施(shi)工(gong)(gong)(gong)工(gong)(gong)(gong)藝、功法和施(shi)工(gong)(gong)(gong)順序(xu)等要求(qiu)進(jin)(jin)行(xing)(xing)組(zu)織實施(shi)，回填(tian)施(shi)工(gong)(gong)(gong)完(wan)成后需對(dui)波紋(wen)管(guan)形狀進(jin)(jin)行(xing)(xing)檢測(ce)，要求(qiu)其結構形狀與組(zu)裝時的形狀大不(bu)超過±2.0%。