發(fā)布時間：2018-04-09 08:02

  本文選題：高壓旋噴　切入點：鋼板樁　出處：《湖北工業(yè)大學(xué)》2017年碩士論文

【摘要】：成都市是四川省的省會城市,天府新區(qū)是四川省的首個國家級新區(qū),貨運通道工程是天府新區(qū)行政區(qū)域內(nèi)的國家級投資工程建設(shè)項目,該工程在創(chuàng)新大道末端DK36+860~DK37+238區(qū)段新建錦江大橋跨越成都市的泄洪通道即府河又名錦江河,橋區(qū)位于火石巖村“U”型河道區(qū)段內(nèi),該處河道寬度達70m,且主跨3#橋墩處于“U”型河道的河槽較低區(qū)域,河床含約1~2m厚的卵石層,該河道區(qū)段上層地質(zhì)覆蓋層都非常薄,其下層為強風(fēng)化泥巖夾砂巖,因此設(shè)計上采用橋梁結(jié)構(gòu)跨越。錦江大橋全長378m,結(jié)構(gòu)形式為:30m簡支箱梁+(35m+3×60m+35m)支架現(xiàn)澆連續(xù)箱梁+3×30m現(xiàn)澆連續(xù)箱梁,其中主跨3#墩承臺底標高為441.503m,預(yù)計施工期間洪水位約為451.0m,基坑開挖深度9.497m,樁基施工前采用粘土填筑平臺,該墩在基坑開挖時若按照常規(guī)施工方式,將產(chǎn)生嚴重滲水,存在極大的安全隱患。所以本課題旨在論證采用雙排Φ0.5m咬合高壓旋噴樁進行止水,同時配合使用拉森Ⅳ型鋼板樁對基坑進行支護的施工工藝,能保證開挖施工時基坑不產(chǎn)生滲水,進而保證承臺干施工條件。本課題研究內(nèi)容包括水中施工平臺筑島技術(shù)、基坑止水技術(shù)、圍堰基坑支護技術(shù)、深基坑巖層開挖技術(shù)和汛期圍堰筑島平臺防洪技術(shù)。通過本次工程實例論證,采用高壓旋噴樁搭配拉森Ⅳ型鋼板樁止水對于黏土層止水效果良好,該工藝能有效的防止基坑滲水,保證基坑施工安全,而且采用三重管高壓旋噴樁可在樁基施工時同步施工,能夠充分節(jié)約工期,且在插打鋼板樁時不會出現(xiàn)交錯影響,對于本工程汛期的快速施工極為有利。通過本課題的研究,促使施工企業(yè)在淺覆蓋層條件下大埋深水中承臺施工技術(shù)有所創(chuàng)新和突破,同時在本課題研究成果的基礎(chǔ)上,進行擴展形成系統(tǒng)的淺覆蓋層條件下大埋深水中承臺施工技術(shù),在橋梁工程建設(shè)飛速發(fā)展的今天,具有廣闊的應(yīng)用前景,對進一步帶動基建行業(yè)在該技術(shù)領(lǐng)域的共同進步和發(fā)展有深遠意義。
[Abstract]:Chengdu city is the capital city of Sichuan Province, Tianfu new area is the first national district in Sichuan Province, freight corridor project is the national investment construction project administrative area of Tianfu District in the discharge channel of the project in the end section of the new Jinjiang DK36+860~DK37+238 innovation Avenue bridge across the city of Chengdu is also known as Jin Fu River Bridge area is located in the river, the flint rock village "U" river section, the channel width is up to 70m, and the main span of 3# bridge in the "U" type of river channel low, river bed with gravel layer about 1~2m thick, the upper section of river geological layer is very thin, the lower mudstone weathered sandstone, so design of the bridge across the Jinjiang bridge. The full-length 378m structure: 30m simply supported box girder + (35m+3 * 60m+35m) support cast-in-place continuous box girder +3 * 30m Cast-in-situ Continuous Box Girder, the main span of 3# pier bearing platform bottom elevation is 44 1.503m, is expected during the construction of the flood level is about 451.0m, 9.497m depth of excavation, clay filling platform with pile foundation construction, the pier in the excavation according to the conventional construction methods will lead to serious water seepage, there is a big security risk. So the purpose of this study is to demonstrate by double 0.5m occlusion of high pressure jet grouting pile for water sealing at the same time with the use of type IV Larson steel sheet pile for foundation pit supporting construction technology, to ensure the construction of foundation pit excavation without water seepage, and ensure the construction conditions of pile cap dry. This paper includes the technology for island water construction platform, foundation pit waterproof technology, cofferdam excavation technology, deep foundation pit excavation of rock and flood cofferdam island platform of flood control technology. Through the demonstration of this project, using high pressure jet grouting pile collocation Larson steel sheet pile type IV for sealing the sealing effect of clay layer is good, the process can Effectively prevent pit seepage, ensure the safety of foundation pit construction, and adopts three pipe high pressure jet grouting pile construction can be synchronized in the pile foundation construction, can save time, and inserting the steel sheet pile does not appear staggered, for rapid construction of the project in flood season is extremely beneficial. Through the research, promotes the construction enterprises in the shallow layer under the condition of large buried deep in the pile cap construction technology innovation and breakthroughs, based on the research on the construction technology of deep buried large cap shallow overburden conditions were extended to form the system, in the bridge construction rapid development today, has a wide application prospect and profound the significance of the common progress and development and further promote the construction industry in the technical field.

【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U445.559

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本文編號：1725543