鋼波紋管涵(han)沒有(you)(you)進入設計劃(hua)定的持力層,但深度(du)知足(zu)設計值,或者(zhe)打(da)落在堅(jian)硬的障礙物上,影(ying)響不(bu)(bu)亂性與(yu)可靠性。同時,鋼制波(bo)紋管涵(han)傾斜渡過大(da),斷裂等現(xian)象發(fa)生,影(ying)響其承載力[1],或者(zhe)勘察(cha)講(jiang)演不(bu)(bu)全(quan)面,與(yu)實際(ji)情況不(bu)(bu)符(fu)合(he),數據資料不(bu)(bu)全(quan)面,難(nan)以(yi)有(you)(you)效(xiao)指導鋼制波(bo)紋管涵(han)施(shi)工,輕易引發(fa)質量缺陷(xian)。

鋼波紋管涵承載力過低表現在哪些方面？

在公路工(gong)(gong)程施工(gong)(gong)中,鋼(gang)制(zhi)(zhi)波(bo)(bo)紋(wen)管(guan)(guan)涵施工(gong)(gong)長(chang)短常(chang)樞(shu)紐的內容。但一些(xie)施工(gong)(gong)單位忽視采取質量控制(zhi)(zhi)措施,設計不(bu)到位,導致(zhi)工(gong)(gong)程建設仍舊存在不(bu)足,主要體現在以下方(fang)面(mian)。鋼(gang)制(zhi)(zhi)波(bo)(bo)紋(wen)管(guan)(guan)涵承載(zai)力(li)過低表(biao)現為(wei)承載(zai)力(li)未(wei)能(neng)知(zhi)足設計規(gui)范要求,施工(gong)(gong)職(zhi)員質量控制(zhi)(zhi)意(yi)識稀(xi)薄(bo),沒有遵循技術(shu)規(gui)范尺(chi)度開展鋼(gang)制(zhi)(zhi)波(bo)(bo)紋(wen)管(guan)(guan)涵施工(gong)(gong)。

跟(gen)著施(shi)工(gong)(gong)技術發(fa)展與提高,公路工(gong)(gong)程建(jian)(jian)設數目不斷增多,難度也在(zai)加大。為確保結構穩固(gu)可靠,知(zhi)足施(shi)工(gong)(gong)建(jian)(jian)設需要(yao),加強(qiang)質(zhi)(zhi)量(liang)(liang)(liang)控制是(shi)十分必要(yao)的。鋼制波紋管涵是(shi)常見的技術措施(shi),在(zai)工(gong)(gong)程建(jian)(jian)設中得到有(you)效(xiao)應用。為保證施(shi)工(gong)(gong)質(zhi)(zhi)量(liang)(liang)(liang),不僅(jin)要(yao)嚴格遵循工(gong)(gong)藝(yi)流程,落實施(shi)工(gong)(gong)技術措施(shi),還要(yao)加強(qiang)質(zhi)(zhi)量(liang)(liang)(liang)治(zhi)理,建(jian)(jian)立完善的質(zhi)(zhi)量(liang)(liang)(liang)治(zhi)理軌制。

管(guan)(guan)涵管(guan)(guan)節采(cai)用(yong)Q235-A熱軋鋼(gang)板(ban)(ban),每圈由8塊鋼(gang)板(ban)(ban)連接(jie)組成整體(ti),再進行(xing)縱向連接(jie)成型。連接(jie)螺栓采(cai)用(yong)M208.8級(ji)高強度螺栓及HRC35級(ji)弧形墊圈,鋼(gang)板(ban)(ban)表面經由熱鍍鋅處理。管(guan)(guan)涵基礎厚度為120cm。洞口鋪(pu)(pu)砌(qi)及護(hu)坡(po)采(cai)用(yong)M7.5漿砌(qi)片石鋪(pu)(pu)砌(qi)或采(cai)用(yong)鋼(gang)筋混凝土澆(jiao)筑洞口。管(guan)(guan)涵流水面坡(po)度為1%~3%。

現以(yi)1-5m鋼制(zhi)波(bo)紋(wen)管(guan)(guan)涵(han)(han)(han)(han)工(gong)(gong)程實例就(jiu)鋼制(zhi)波(bo)紋(wen)管(guan)(guan)涵(han)(han)(han)(han)工(gong)(gong)程施(shi)(shi)工(gong)(gong)工(gong)(gong)藝控制(zhi)簡述如下。某高速公路因為(wei)工(gong)(gong)期較緊,考(kao)慮到原設計為(wei)1-2m石拱涵(han)(han)(han)(han),而且其上(shang)有(you)高達20m左右的(de)涵(han)(han)(han)(han)頂填(tian)(tian)土,因為(wei)石拱涵(han)(han)(han)(han)施(shi)(shi)工(gong)(gong)進(jin)(jin)度較慢,為(wei)加快施(shi)(shi)工(gong)(gong)進(jin)(jin)度,業主(zhu)部(bu)分要求將(jiang)原設計石拱涵(han)(han)(han)(han)變(bian)更設計為(wei)1-5m鋼制(zhi)波(bo)紋(wen)管(guan)(guan)涵(han)(han)(han)(han)工(gong)(gong)程涵(han)(han)(han)(han),以(yi)保(bao)證施(shi)(shi)工(gong)(gong)質量(liang),加快工(gong)(gong)程建設進(jin)(jin)度。波(bo)紋(wen)管(guan)(guan)涵(han)(han)(han)(han)為(wei)直徑(jing)5m的(de)組裝波(bo)紋(wen)管(guan)(guan),全長(chang)110m,填(tian)(tian)方高度達20余米。

鋼波紋管是替換圓管涵(han)、蓋板(ban)涵(han)、拱涵(han)和(he)小橋的優質(zhi)公(gong)路建材(cai),該產品具有(you)工期短、重量(liang)輕(qing)、安裝利便、耐久性好、工程造價低、抗變形能(neng)力較強(qiang)、減少通車(che)后(hou)養護(hu)本錢等長處(chu),尤其應用在高寒凍土(tu)地區,軟土(tu)路基(ji)地帶和(he)深(shen)填土(tu)地帶具有(you)顯著的經(jing)濟效(xiao)益。