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基本介紹

許溝大橋(qiao)位于洛三高速公路k49+453.37~k49+946.51，三門峽義馬市近(jin)郊，該橋(qiao)橋(qiao)孔布置自東向西：9×20m+220m+4×20m，全(quan)長493.14m。由中(zhong)鐵十一局集團第一工程有限公司施工建設。

建筑特色

該橋(qiao)(qiao)橋(qiao)(qiao)孔布置自東向(xiang)西：9×20m+220m+4×20m，全長493.14m。主(zhu)孔為(wei)(wei)等截(jie)面(mian)(mian)(mian)懸(xuan)鏈線箱形(xing)無鉸拱(gong)，截(jie)面(mian)(mian)(mian)為(wei)(wei)三室箱，拱(gong)軸系(xi)數m=1.543，凈(jing)跨徑(jing)L0=220m，凈(jing)矢高(gao)f0=40m，矢跨比f0/L0=1/5.5。拱(gong)上建筑(zhu)為(wei)(wei)13-17.5m先張預應(ying)力(li)混凝土空(kong)(kong)心板及雙柱(zhu)(zhu)式(shi)排(pai)架立柱(zhu)(zhu)，橋(qiao)(qiao)面(mian)(mian)(mian)連續(xu)，柱(zhu)(zhu)間設(she)橫向(xiang)聯(lian)系(xi)。東西引橋(qiao)(qiao)為(wei)(wei)20m預應(ying)力(li)混凝土空(kong)(kong)心板梁，橋(qiao)(qiao)面(mian)(mian)(mian)連續(xu)，下部為(wei)(wei)雙柱(zhu)(zhu)式(shi)墩(dun)臺(tai)，基礎為(wei)(wei)鉆孔灌注嵌(qian)巖(yan)樁。

該橋(qiao)(qiao)(qiao)橋(qiao)(qiao)(qiao)寬為24m，分(fen)上(shang)(shang)、下行(xing)，單幅橋(qiao)(qiao)(qiao)寬為12m（11+2×0.5m墻式護欄）。設(she)計荷載為：汽-超20，掛-120。主(zhu)拱(gong)(gong)拱(gong)(gong)座(zuo)為重力式基(ji)(ji)礎，置于樁基(ji)(ji)或完整(zheng)砂巖上(shang)(shang)。上(shang)(shang)下行(xing)之間設(she)3cm沉降縫，每個拱(gong)(gong)座(zuo)混(hun)凝土(tu)量(liang)6000m以上(shang)(shang)，屬大體積混(hun)凝土(tu)，采取基(ji)(ji)坑(keng)滿注(zhu)，提(ti)高拱(gong)(gong)座(zuo)背后土(tu)抗力；主(zhu)拱(gong)(gong)拱(gong)(gong)箱采用C50混(hun)凝土(tu)。上(shang)(shang)、下行(xing)拱(gong)(gong)圈之間為加(jia)強(qiang)聯結(jie)，設(she)6處聯結(jie)系。

活動及其他

地理環境

許溝(gou)(gou)大(da)橋位于(yu)洛三高速公路k49+453.37~k49+946.51，三門峽義(yi)馬(ma)市近郊，常(chang)窯水(shui)庫下游，跨越許溝(gou)(gou)，溝(gou)(gou)中常(chang)年無(wu)水(shui)。溝(gou)(gou)槽內地(di)勢較為(wei)平坦，表層(ceng)(ceng)為(wei)亞砂土，下層(ceng)(ceng)為(wei)卵石層(ceng)(ceng)；兩岸地(di)質(zhi)較好，表層(ceng)(ceng)有0~3m的沖積亞砂土和卵石層(ceng)(ceng)，下層(ceng)(ceng)為(wei)泥質(zhi)粉砂與粉砂質(zhi)泥頁巖互(hu)層(ceng)(ceng)。該地(di)區最(zui)大(da)風力為(wei)20m/s，有霜期為(wei)180~240天。