本文關(guān)鍵詞：中牟縣廣惠街清源大橋檢測(cè)與維修改造技術(shù)研究　出處：《鄭州大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 外觀檢測(cè) 靜載試驗(yàn) 動(dòng)載試驗(yàn) 維修改造

【摘要】：近年來(lái)我國(guó)交通運(yùn)輸量快速增添,成千上萬(wàn)的老路舊橋中很大一部分都已不能滿足不斷增長(zhǎng)的交通量需求,特別是初期修建的橋梁,因?yàn)樵O(shè)計(jì)標(biāo)準(zhǔn)低,年久失修維護(hù)養(yǎng)護(hù)不足,很多都是超限運(yùn)行,正在逐步成為危橋。隨著路網(wǎng)改造、老路改建和道路升級(jí),橋梁在長(zhǎng)期的運(yùn)營(yíng)過(guò)程中不可避免的出現(xiàn)各種結(jié)構(gòu)損傷,自然環(huán)境的變化,車輛密度的大幅上升,重型車輛日漸增多,這些因素都導(dǎo)致了橋梁承載能力和耐久性的降低,這些損害都是不可扭轉(zhuǎn)的,在運(yùn)營(yíng)中存在較大的安全隱患,這些危橋嚴(yán)重影響了交通運(yùn)輸?shù)陌l(fā)展,這導(dǎo)致了一系列的問題,需要引起全社會(huì)的密切關(guān)注。本文以中牟縣廣惠街清源大橋?yàn)槔?通過(guò)該橋外觀檢測(cè)發(fā)現(xiàn)行車道、墩頂均有裂縫,錨固區(qū)混凝土局部嚴(yán)重破損；部分梁板混凝土破損,板底有刮蹭、箍筋銹脹,板縫局部脫落,多處受滲水析堿；部分支座局部或完全脫空,部分支座輕度或較嚴(yán)重開裂,部分支座墊石局部破損開裂；墩臺(tái)蓋梁局部較嚴(yán)重滲水,有較嚴(yán)重的混凝土銹脹區(qū)；蓋梁有豎向裂縫。靜載試驗(yàn)中該橋測(cè)試跨在工況1-6荷載作用下,主要測(cè)試點(diǎn)的橫向分布系數(shù)的實(shí)測(cè)與理論值偏差大,表明橫向聯(lián)系較差,空心板不能整體受力。動(dòng)載試驗(yàn)中在工況7實(shí)測(cè)沖擊系數(shù)大于理論值1.236,說(shuō)明在不良路況情況下橋梁沖擊系數(shù)會(huì)增加。根據(jù)以上試驗(yàn)結(jié)果分析橋梁受損的原因,研究橋梁維修改造方案。橋梁檢測(cè)可用于評(píng)估舊橋的實(shí)際承載能力,為有效的設(shè)計(jì)和維修改造方案提供依據(jù),希望本文能提供經(jīng)驗(yàn),為以后類似的工程有所幫助。
[Abstract]:In recent years, the traffic volume of our country increases rapidly, and a large part of the thousands of old old bridges can not meet the increasing demand of traffic volume, especially the bridge built in the early stage, because of the low design standard. Lack of maintenance and maintenance in years of disrepair, many of which are overrun, are gradually becoming dangerous bridges. With the road network transformation, old road reconstruction and road upgrading. Bridge in the long-term operation process inevitably appear a variety of structural damage, changes in the natural environment, vehicle density increased significantly, heavy vehicles are increasing day by day. These factors have led to the reduction of the bearing capacity and durability of the bridge, which are irrevocable, and there are large safety risks in operation. These dangerous bridges seriously affect the development of transportation. This led to a series of problems, which need the attention of the whole society. This paper takes Qingyuan Bridge of Guanghui Street in Zhongmou County as an example, through the inspection of the appearance of the bridge found the carriageway, pier roof have cracks. Serious local damage of concrete in Anchorage zone; Part of the beam and slab concrete is damaged, the bottom of the plate is scratched, the stirrups are rusty, the plate joints are partially shedded, and many places are subjected to water seepage and alkali evolution; Part of the bearing is partially or completely empty, part of the support is slightly or severely cracked, and some of the support cushion is partially damaged and cracked; The piers and abutment beams have serious local water seepage and serious concrete rust expansion zone. There are vertical cracks in the cover beam. In the static load test, the transverse distribution coefficient of the main test points deviates greatly from the theoretical value, which indicates that the transverse connection is poor. Hollow slabs can not be subjected to force as a whole. In dynamic load test, the measured impact coefficient is larger than the theoretical value of 1.236 under 7 working conditions. It shows that the impact coefficient of the bridge will increase under the condition of bad road condition. According to the above test results, the causes of the bridge damage are analyzed, and the bridge maintenance and reconstruction scheme is studied. The bridge detection can be used to evaluate the actual bearing capacity of the old bridge. In order to provide the basis for effective design and maintenance modification, I hope this paper can provide experience and help for similar projects in the future.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.7

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本文編號(hào)：1421042