The invention provides a construction method for protecting barrel of underwater cast-in-place pile: 1) steel plate is rolled and welded into a small protective barrel with an inner diameter greater than or equal to the design pile diameter + D; 2) steel plate is rolled and welded into a large protective barrel with an inner diameter equal to the small protective barrel inner diameter + D; 3) hydraulic vibration hammer and crawler are used to hoist the large protective barrel to a predetermined position, and the bottom is deep into the river bed, and the top is flat with steel. The platform is fixed; 4) hydraulic vibrating hammer and crawler are used to hoist the small guard barrel into the large guard barrel, and the bottom of the small guard barrel is even with the big guard barrel, and the top edge is fixed and connected with the big guard barrel through the circumferential connecting plate; 5) filling impermeable material into the gap between the small guard barrel and the big guard barrel to seal the bottom gap; 6) construction workers of Bored Piles in accordance with the convention. When the concrete filling in the small protective barrel is completed, the large protective barrel is lifted by hydraulic vibrating hammer and crawler crane and recycled. The water sealing layer is formed at the bottom of the protective barrel and the contact surface between the large and small protective barrels by filling impermeable material in the gap between the protective barrels and realizing the water sealing.
【技术实现步骤摘要】
水下灌注桩护筒施工方法
本专利技术属于公路及市政工程桥梁施工领域,具体涉及一种水下灌注桩护筒防漏施工方法。
技术介绍
随着城市建设的快速发展,涉及到跨江、跨河的公路及市政桥梁工程愈来愈多。桥梁施工首先进行的就是桩基础施工,“基础不牢,地动山摇”,这也就凸显了桩基工程施工质量的重要。跨江、跨河大直径桩基一般位于深水区,施工多采用搭设临时钢平台。由于水下河床多变,地质结构复杂,软弱流动砂土层、均匀岩层、断裂岩层、不均匀岩层等均可能出现,易造成钢护筒与水下河床接触面不紧密,从而导致了钢护筒的漏浆问题成为目前水下桥梁灌注桩施工中常见的质量通病。一旦出现钢护筒渗漏,江(河)水与护筒内泥浆相连通,护筒内泥浆水位下落,泥浆压力丧失,泥浆稠度降低,极易造成塌孔。再加上桩基直径较大,作业过程中孔壁压力大,如泥浆渗漏,孔内扩张力难以支撑孔壁侧压力,孔壁局部土体(岩体)滑落孔底,会影响成桩过程的进尺,严重的情况下甚至会填埋锤头、钢筋笼,需返工重新钻进,处理难度大,费时费力;或者出现塌孔,导致孔内体积变大,造成混凝土灌注量增加,增加材料浪费。目前的一些解决方法主要有以下几种:①引孔:就是先行施钻引导护筒安装就位。优点是方便施工,节约资源,护筒嵌入河床,与河床接触面比较平整。但接触面仍属于刚性连接,连接紧密度不足,少量渗漏,钻进过程中需持续补水造浆,影响质量。②护筒接长是在原护筒上焊接(满焊)一节或多节护筒,接长钢护筒后采用液压振动锤振击护筒继续下沉,增加护筒长度。接长后护筒底部穿透失稳塌落的孔壁嵌入更深的河床中,封闭了塌陷的空洞,避免漏浆。优点:能封闭护筒底空洞,控制漏浆效果明显 ...
【技术保护点】
1.一种水下灌注桩护筒施工方法:1)用钢板卷制焊接成小护筒,其内径≥设计桩径+D;2)用钢板卷制焊接成大护筒,其内径=小护筒内径+D;3)采用液压振动锤和履带将大护筒吊装至预定位置,底部深入河床,顶部与钢平台固接;4)采用液压振动锤和履带将小护筒吊装至大护筒内,其底部与大护筒平齐,顶口边沿通过周向布置的连接板与大护筒固定连接;5)向小护筒和大护筒间隙处填筑不透水材料,封住底部缝隙;6)按照常规钻孔灌注桩施工工艺施工,待小护筒内混凝土灌注完成,采用液压振动锤和履带吊将大护筒提起,循环再利用。
【技术特征摘要】
1.一种水下灌注桩护筒施工方法:1)用钢板卷制焊接成小护筒,其内径≥设计桩径+D;2)用钢板卷制焊接成大护筒,其内径=小护筒内径+D;3)采用液压振动锤和履带将大护筒吊装至预定位置,底部深入河床,顶部与钢平台固接;4)采用液压振动锤和履带将小护筒吊装至大护筒内,其底部与大护筒平齐,顶口边沿通过周向布置的连接板与大护筒固定连接;5)向小护筒和大护筒间隙处填筑不透水材料,封住底部缝隙;6)按照常规钻孔灌注桩施工工艺施工,待小护筒内混凝土灌注完成,采用液压振动锤和履带吊将...
【专利技术属性】
技术研发人员:王文东,张建英,
申请(专利权)人:中国二十二冶集团有限公司,
类型:发明
国别省市:河北,13
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