【摘要】：目前大型橋梁施工都采用圍堰進(jìn)行水中墩施工，施工過程往往會(huì)發(fā)生風(fēng)險(xiǎn)，威脅著施工安全。武漢市鸚鵡洲長江大橋作為一條重要的交通運(yùn)輸通道，其1#墩水中基礎(chǔ)施工采用的是鋼板樁圍堰施工工藝。整個(gè)圍堰的施工過程受到制作拼裝、下河、浮吊插打、下沉等各種風(fēng)險(xiǎn)因素的影響，，威脅著橋梁施工安全。因此進(jìn)行鋼板樁圍堰水中墩施工風(fēng)險(xiǎn)分析并提出相應(yīng)的風(fēng)險(xiǎn)防范措施是十分必要的。本文以武漢市鸚鵡洲長江大橋?yàn)橐劳校捎脤哟?變異系數(shù)理論計(jì)算全橋各施工階段權(quán)重值。結(jié)果表明鋼板樁圍堰施工階段為風(fēng)險(xiǎn)權(quán)重最大的階段，以此開展風(fēng)險(xiǎn)防范措施研究。主要內(nèi)容如下： 1..運(yùn)用層次矩陣法對(duì)武漢鸚鵡洲長江大橋進(jìn)行施工風(fēng)險(xiǎn)分析，計(jì)算出風(fēng)險(xiǎn)權(quán)值最大的施工階段為1#墩基礎(chǔ)施工，在此基礎(chǔ)上采用變異系數(shù)法對(duì)1#墩進(jìn)行風(fēng)險(xiǎn)分析，由此得到風(fēng)險(xiǎn)權(quán)重值最大的施工工序?yàn)殇摪鍢秶呤┕ぃ治鼋Y(jié)果與施工現(xiàn)場(chǎng)得到的實(shí)測(cè)結(jié)論相吻合。 2.詳細(xì)闡述了橋梁施工質(zhì)量風(fēng)險(xiǎn)防范措施與施工安全風(fēng)險(xiǎn)防范措施，并針對(duì)層次-變異系數(shù)法的風(fēng)險(xiǎn)分析結(jié)果，制定了武漢鸚鵡洲長江大橋施工風(fēng)險(xiǎn)防范體系，以1#墩基礎(chǔ)為對(duì)象提出相應(yīng)科學(xué)合理的風(fēng)險(xiǎn)防范措施，用以指導(dǎo)現(xiàn)場(chǎng)的施工，相應(yīng)的結(jié)論具有重要的理論意義和工程實(shí)用價(jià)值。
[Abstract]:At present, cofferdam is used in the construction of large-scale bridges, which often leads to risks in the construction process and threatens the safety of construction. As an important transportation channel, the construction technology of steel sheet pile cofferdam is adopted in the foundation construction of No. 1 pier in Wuhan Nauhuozhou Yangtze River Bridge. The construction process of the cofferdam is affected by various risk factors, such as assembling, lowering the river, floating and slicing, sinking and so on, which threaten the construction safety of the bridge. Therefore, it is necessary to analyze the construction risk of steel sheet pile cofferdam and put forward the corresponding risk prevention measures. In this paper, based on the Nauhuozhou Yangtze River Bridge in Wuhan City, the weight values of each construction stage of the bridge are calculated by using the theory of hierarchy-coefficient of variation (coefficient of variation). The results show that the construction stage of steel sheet pile cofferdam is the stage of maximum risk weight, so the risk prevention measures are studied. The main contents are as follows: 1. In this paper, the construction risk analysis of Wuhan Nauhuozhou Yangtze River Bridge is carried out by using the hierarchical matrix method, and the construction stage of the maximum risk weight is calculated as 1 # pier foundation construction. On this basis, the variation coefficient method is adopted to carry on the risk analysis to the 1 # pier. As a result, the construction process of steel sheet pile cofferdam with the maximum risk weight is obtained, and the analysis results are in good agreement with the measured results obtained in the construction site. 2. In this paper, the preventive measures of bridge construction quality risk and construction safety risk are expounded in detail. According to the risk analysis result of hierarchy-coefficient of variation method, the construction risk prevention system of Wuhan Nauhuozhou Yangtze River Bridge is established. Taking 1 # pier foundation as the object, the corresponding scientific and reasonable risk prevention measures are put forward to guide the construction of the site. The corresponding conclusions have important theoretical significance and engineering practical value.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.556

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