【作者】 李云飞；

【导师】 吕和林； 刘潭升；

【作者基本信息】 西南交通大学 ， 建筑与土木工程， 2006， 硕士

【摘要】 深水基础施工是衡量桥梁施工技术水平的一个重要标志，深水基础不仅深水环境对它产生许多直接作用，而且深水对其设计理论和施工技术都会提出一些特殊问题。本文针对渝怀铁路阿蓬江大桥深水基础施工，进行了深水基础双壁钢围堰施工技术研究。阿蓬江大桥地处V型河谷，岸坡陡峭，河床淤泥和卵石土层较厚，河床面和基岩面高差较大，要将河床面完全爆平，不仅工作量大，成本高，施工也非常困难。根据这种复杂的地形地质条件，经方案比选，采用局部爆破整平后的圆形高低刃脚双壁钢围堰施工方案。虽然双壁钢围堰只有2／5落在基岩面上，但通过对双壁钢围堰进行改进，即在双壁钢围堰平刃脚下加设单壁插板(高低刃脚)及定位桩，低刃脚插入河床覆盖层，定位桩穿过覆盖层到达基岩面，解决了钢围堰平稳安全地定位在设计位置这一难题。本文结合全部实施过程，阐述采用双壁钢围堰进行深水基础施工的机理、关键技术及施工工艺，研究的主要内容有：双壁钢围堰的设计、加工制作及试验技术；双壁钢围堰的组拼、就位、接高、下沉及定位技术；钢护筒的安设及封底砼的灌注技术；钻孔灌注桩成孔工艺及水下砼施工技术；水下深孔爆破施工技术。为在复杂地质条件下双壁钢围堰施工提供了一条新途径，积累了一套成功的深水基础施工技术资料。更多还原

【Abstract】 The construction of deep-water foundation is an importment symbol for evaluating the bridge construction. Deep-water environment take directly effect on deep-water foundation, furthermore it may put forword some special questions for deep water foundation. Taking the deep water foundation construction of A’pengjiang bridge in yuhuai railway for example, this paper studies the double-well steel cofferdam construction technology of deep-water foundation.A’pengjiang bridge situates in the "V" vally, the riverbank slope is steep and its riverbed has a thick layer of mucky soil and cobble soil. Because the distance between the surface of riverbed and bedrock is large, if we want to blast the riverbed completely flat, it need much workload and high cost and the consrution is also very difficult. According to the complex topographical and geological condition, we adopt a project of the double-sweel steel cofferdam with circular cutting edge after comparing several projects. Though only two fifthes double-well steel cofferdam lies on rockbed, we solve the difficult problem about safely setting the steel cofferdam in the design place through improving the double-well steel cofferdam. Installing the single-swell slab and orientation pile under the double-well steel cofferdam’s flat cutting edge, inserting the low cutting edge in the riverbed covering layer, drilling the orientation pile through covering layer to the rockbed, which are the improving measures. Based on the whole constrution process, this paper presents the principle and key technique and construction technology of using the double-well steel cofferdam to excavate the deep-water foundation. The main context involve five aspects, the first aspect is designing and producing the double-well steel cofferdam and its test technology; the second is the installation and orientation technology; the third are the technology of installation the steel shield and grouting the bottom concrete; the fouth is drilling hole of bored pile technology and grouting technology under water; the last is the construction technology of blasting deep hole under water. These studies afford a new approach for construction double-sweel steel cofferdam in the complex geological condition, and can accumulate a suit of successful construction technology dates about deep-water foundation.更多还原