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基本介紹

許溝大(da)橋(qiao)位于洛三(san)高速公路(lu)k49+453.37~k49+946.51，三(san)門峽義馬市近郊，該橋(qiao)橋(qiao)孔布置自東(dong)向(xiang)西(xi)：9×20m+220m+4×20m，全長493.14m。由中(zhong)鐵十一局集團(tuan)第一工(gong)程有限公司施工(gong)建設。

建筑特色

該橋橋孔(kong)布置自(zi)東(dong)(dong)向(xiang)(xiang)西：9×20m+220m+4×20m，全長493.14m。主孔(kong)為(wei)(wei)等截面(mian)懸鏈(lian)線箱形(xing)無鉸拱，截面(mian)為(wei)(wei)三室箱，拱軸系(xi)數m=1.543，凈跨(kua)徑(jing)L0=220m，凈矢(shi)高f0=40m，矢(shi)跨(kua)比f0/L0=1/5.5。拱上建筑為(wei)(wei)13-17.5m先張預應力(li)混凝(ning)土(tu)空心板(ban)及雙柱式排架立柱，橋面(mian)連續，柱間設(she)橫向(xiang)(xiang)聯系(xi)。東(dong)(dong)西引橋為(wei)(wei)20m預應力(li)混凝(ning)土(tu)空心板(ban)梁(liang)，橋面(mian)連續，下部為(wei)(wei)雙柱式墩臺，基(ji)礎為(wei)(wei)鉆孔(kong)灌注(zhu)嵌巖樁。

該橋(qiao)橋(qiao)寬(kuan)為(wei)24m，分上(shang)、下行(xing)，單幅橋(qiao)寬(kuan)為(wei)12m（11+2×0.5m墻式(shi)護欄）。設(she)計荷載為(wei)：汽-超(chao)20，掛-120。主(zhu)拱(gong)(gong)拱(gong)(gong)座為(wei)重力式(shi)基礎，置于樁基或完(wan)整砂巖上(shang)。上(shang)下行(xing)之間(jian)設(she)3cm沉降縫，每個拱(gong)(gong)座混(hun)凝(ning)土(tu)量6000m以(yi)上(shang)，屬(shu)大體積混(hun)凝(ning)土(tu)，采取基坑滿注，提高拱(gong)(gong)座背后土(tu)抗力；主(zhu)拱(gong)(gong)拱(gong)(gong)箱采用C50混(hun)凝(ning)土(tu)。上(shang)、下行(xing)拱(gong)(gong)圈之間(jian)為(wei)加(jia)強(qiang)聯(lian)結，設(she)6處聯(lian)結系。

活動及其他

地理(li)環境

許溝(gou)大(da)橋位于洛三高(gao)速公(gong)路k49+453.37~k49+946.51，三門(men)峽(xia)義馬市近郊，常窯水(shui)庫下(xia)游，跨越許溝(gou)，溝(gou)中(zhong)常年無水(shui)。溝(gou)槽內地(di)(di)勢(shi)較(jiao)(jiao)為(wei)(wei)(wei)平(ping)坦，表(biao)層為(wei)(wei)(wei)亞(ya)(ya)砂(sha)土(tu)，下(xia)層為(wei)(wei)(wei)卵石(shi)層；兩岸地(di)(di)質(zhi)較(jiao)(jiao)好(hao)，表(biao)層有0~3m的(de)沖積亞(ya)(ya)砂(sha)土(tu)和卵石(shi)層，下(xia)層為(wei)(wei)(wei)泥(ni)質(zhi)粉(fen)砂(sha)與粉(fen)砂(sha)質(zhi)泥(ni)頁巖(yan)互(hu)層。該地(di)(di)區最大(da)風(feng)力為(wei)(wei)(wei)20m/s，有霜期為(wei)(wei)(wei)180~240天。