發(fā)布時(shí)間：2018-12-21 15:34

【摘要】：由于上部荷載、水流及腐蝕環(huán)境等作用,橋梁水下混凝土結(jié)構(gòu)的病害往往較為嚴(yán)重且難以發(fā)現(xiàn)。以不排水加固為指導(dǎo)思想,開展了水下混凝土結(jié)構(gòu)病害修復(fù)技術(shù)的相關(guān)研究,通過在試驗(yàn)室水箱中對(duì)各類水下混凝土結(jié)構(gòu)的病害進(jìn)行模擬修復(fù)施工,提出水下病害修復(fù)技術(shù)工藝,主要包括水下混凝土結(jié)構(gòu)裂縫修補(bǔ)、孔洞缺陷修復(fù)工藝。水下修復(fù)混凝土結(jié)構(gòu)的力學(xué)性能對(duì)比試驗(yàn)表明,水下裂縫修補(bǔ)試件的破壞位置并不位于原結(jié)構(gòu)裂縫位置,破壞屬于混凝土內(nèi)聚破壞,水下裂縫灌注膠對(duì)水下施工環(huán)境具有很好的適應(yīng)性。經(jīng)過水下混凝土孔洞修復(fù)工藝修復(fù)的缺陷試件,其抗壓強(qiáng)度可以達(dá)到完好對(duì)比試件的強(qiáng)度,并超過其16.7%,修復(fù)所用的水下環(huán)氧膠強(qiáng)度指標(biāo)遠(yuǎn)高于混凝土的強(qiáng)度指標(biāo),使得修復(fù)試件的強(qiáng)度有所提高,試件破壞時(shí)孔洞周圍裂縫和破損較少,水下孔洞修復(fù)工藝對(duì)水下受損結(jié)構(gòu)的加固作用較為明顯。
[Abstract]:Due to the effects of upper load, water flow and corrosion environment, the disease of bridge underwater concrete structure is often serious and difficult to find. Based on the principle of undrained reinforcement, the related research on the repair technology of underwater concrete structure is carried out, and the simulated repair construction of all kinds of underwater concrete structures is carried out in the water tank of the laboratory. This paper puts forward the technology of repairing underwater disease, mainly including crack repair of underwater concrete structure and repair process of hole defect. The comparative tests of mechanical properties of underwater repaired concrete structure show that the failure position of underwater crack repair specimen is not located at the original crack position, and the damage belongs to the cohesive failure of concrete. Underwater crack grouting glue has good adaptability to underwater construction environment. The compressive strength of the defective specimen repaired by the underwater concrete hole repair process can reach the strength of the intact contrast specimen and exceed its 16.7. The strength index of the underwater epoxy adhesive used in the restoration is much higher than the strength index of the concrete. The strength of the repaired specimen is improved, the cracks and damage around the hole are less when the specimen is damaged, and the reinforcement effect of the underwater hole repair technology on the underwater damaged structure is obvious.
【作者單位】： 安徽省交通控股集團(tuán)有限公司;南京林業(yè)大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金(51208262) 安徽省交通控股集團(tuán)有限公司科技項(xiàng)目 江蘇省自然科學(xué)基金(BK20151520) 江蘇高校優(yōu)勢學(xué)科建設(shè)工程資助項(xiàng)目(PAPD) 江蘇省“333”工程(BRA2016421) 江蘇省“青藍(lán)工程”項(xiàng)目
【分類號(hào)】：U445.7

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