| ||||||
| ||||||
1月30日凌晨1時,水電公司廣東中開高速公路土建項目岐江河大橋梁荷載試驗完成。 岐(qi)江河大(da)橋(qiao)(qiao)(qiao)作(zuo)為(wei)(wei)廣東中(zhong)開高速(su)公(gong)路(lu)項目(mu)控制性工程,主橋(qiao)(qiao)(qiao)為(wei)(wei)雙層(ceng)鋼桁架橋(qiao)(qiao)(qiao)梁(liang)結(jie)構,上層(ceng)橋(qiao)(qiao)(qiao)為(wei)(wei)中(zhong)開高速(su)公(gong)路(lu),下層(ceng)橋(qiao)(qiao)(qiao)為(wei)(wei)南外(wai)環市(shi)政道(dao)路(lu),2023年4月15日(ri)下層(ceng)南外(wai)環市(shi)政路(lu)通車(che)運行(xing),上層(ceng)橋(qiao)(qiao)(qiao)于2024年1月20日(ri)完成(cheng)瀝青路(lu)面施(shi)工,具(ju)備橋(qiao)(qiao)(qiao)梁(liang)檢測條件。 為保(bao)證(zheng)廣東中(zhong)開高速(su)施(shi)工(gong)項目順利(li)交(jiao)(jiao)工(gong)驗(yan)收,同時(shi)結(jie)合(he)現場施(shi)工(gong)安全(quan)(quan)條件,本(ben)次橋梁(liang)(liang)荷載試驗(yan)于(yu)1月26日至1月30日晚上22時(shi)至次日6時(shi)對南外環(huan)路全(quan)(quan)幅(fu)斷交(jiao)(jiao),交(jiao)(jiao)工(gong)檢(jian)測(ce)包含動靜載試驗(yan)內容,其(qi)中(zhong)靜載試驗(yan)主要開展(zhan)主拱及(ji)(ji)主桁(heng)控制截面應變(應力)測(ce)試、主拱及(ji)(ji)主桁(heng)撓度測(ce)試、典(dian)型(xing)吊桿索(suo)力測(ce)試、關鍵截面或部位裂縫監測(ce),以檢(jian)驗(yan)橋梁(liang)(liang)結(jie)構的實際工(gong)作性能(neng);動載試驗(yan)主要進行(xing)(xing)進行(xing)(xing)無障礙(ai)和有障礙(ai)行(xing)(xing)車(che)荷載作用(yong)下的沖擊系數、橋梁(liang)(liang)頻率、振型(xing)、阻尼比等動力特性參(can)數。 靜載(zai)試(shi)驗合并為2個工況進行(xing)(xing),工況1上(shang)(shang)下層(ceng)橋(qiao)同(tong)步(bu)采用共(gong)28輛重約(yue)350千牛的(de)載(zai)重汽(qi)車進行(xing)(xing)加載(zai),工況2上(shang)(shang)下層(ceng)橋(qiao)同(tong)步(bu)采用32輛重約(yue)350千牛的(de)載(zai)重汽(qi)車進行(xing)(xing)加載(zai),均分4級加載(zai)和1級卸載(zai)。 動(dong)載(zai)(zai)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)分為(wei)無(wu)障(zhang)(zhang)礙行(xing)車試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)和(he)有障(zhang)(zhang)礙行(xing)車試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan):無(wu)障(zhang)(zhang)礙行(xing)車試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)在(zai)橋(qiao)面(mian)(mian)無(wu)任(ren)何障(zhang)(zhang)礙的情(qing)況下(xia)(xia),利(li)用(yong)2臺重約(yue)350千牛的載(zai)(zai)重汽車,以(yi)約(yue)10~60千米(mi)(mi)/時(shi)的不(bu)同車速(su)在(zai)橋(qiao)面(mian)(mian)并(bing)行(xing)行(xing)駛,以(yi)測試(shi)(shi)(shi)(shi)結構在(zai)行(xing)車荷載(zai)(zai)作用(yong)下(xia)(xia)的動(dong)力反應(ying)。有障(zhang)(zhang)礙行(xing)車試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)在(zai)橋(qiao)面(mian)(mian)上(shang)設(she)置(zhi)高7厘米(mi)(mi)的弓形(xing)板(ban)作為(wei)障(zhang)(zhang)礙物,以(yi)模擬橋(qiao)面(mian)(mian)不(bu)平整(zheng)狀態;利(li)用(yong) 2 臺重約(yue)350千牛的載(zai)(zai)重汽車,以(yi)約(yue)5~20千米(mi)(mi)/時(shi)的速(su)度(du)在(zai)橋(qiao)面(mian)(mian)上(shang)并(bing)行(xing)行(xing)駛,以(yi)測試(shi)(shi)(shi)(shi)結構在(zai)橋(qiao)面(mian)(mian)不(bu)良狀態時(shi)在(zai)行(xing)車荷載(zai)(zai)作用(yong)下(xia)(xia)的動(dong)力反應(ying)。 岐(qi)江河大(da)橋(qiao)梁荷載試驗完成,為(wei)項(xiang)目交工驗收(shou)奠(dian)定了基礎,同時為(wei)加快大(da)灣(wan)區(qu)道路通(tong)行提供重要保障。 | ||||||
[打印頁面] [關閉窗口] |
瀏覽: |