| 水上振动沉管碎石桩施工关键技术应用 |
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| 引用本文： | 吴松华,章哲华.水上振动沉管碎石桩施工关键技术应用[J].海岸工程,2020,39(4):263-270. |
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| 作者姓名： | 吴松华 章哲华 |
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| 作者单位： | 中交水利水电建设有限公司,浙江 宁波 315200,中交水利水电建设有限公司,浙江 宁波 315200 |
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| 基金项目： | 中交上海航道局有限公司技术研发项目 |
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| 摘 要： | 针对振动沉管碎石桩水上施工应用少、合适船机设备少、桩身质量控制难等问题,通过改造施工船机设备,优化关键技术参数和施工工艺,依托具体工程开展现场研究。采用三管式碎石桩船,研发了大开度活瓣钢桩靴,配置沉桩定位及视频监控系统实现施工过程的可视化;碎石添加采用干法填料、管身开孔润料、提升过程不留振的工艺,可顺利拔管成桩;采用皮带机供料、计量斗计量、提升斗运输的一体化加料工艺,碎石填料可精确控制。结果表明:通过将桩间距2.3 m 分别调整为桩间距2.4 m、排间距2.18 m 和桩间距2.1 m、排间距2.5 m,整个桩身分为三段,并控制平均拔管速度为1.5 m/min,充盈系数采用1.38,合理分批次加料、干法填料,两次留振时间分别控制在20 s和60 s等措施,经重型动力触探法检测,表层2 m 锤击数平均值为8.3,2 m 以下锤击数平均值为11.2,满足表层2 m 的碎石桩重型动力触探锤击数达到7击以上,2 m 以下贯入10 cm 锤击数不小于10击的设计要求。
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| 关 键 词： | 沉管碎石桩 钢桩靴 三管式 干法填料 可视化 振动 密实度 |
Application of Key Technology for Construction of on-Water Vibration Sinking-Pipe Gravel Piles |
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| WU Song-hu,ZHANG Zhe-hua.Application of Key Technology for Construction of on-Water Vibration Sinking-Pipe Gravel Piles[J].Coastal Engineering,2020,39(4):263-270. |
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| Authors: | WU Song-hu ZHANG Zhe-hua |
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| Institution: | CCCC Water Resources and Hydropower Construction Co., Ltd., Ningbo 315200, China |
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| Abstract: | In view of the problems such as the less of application of on-water construction of vibration sinking-pipe gravel piles, the lack of suitable ship and equipment and the difficulty in quality control, and so on, a set of effective on-water construction techniques and quality control measures are formed by transforming the ship and equipment for the construction, optimizing the key technical parameters and construction technology, which are fast in feeding rate, accurate in gravel addition and measurement and high in automation level and construction efficiency. The results from the tests have indicated that the formed piles have large diameter, good drainage effect, high bearing capacity of foundation and small late settlement. As a result, many technical difficulties occurring in the construction of on-water vibration sinking-pipe gravel piles can be solved, for instance, obstruction of gravel falling, insufficient irrigation amount, poor compactness, and or so. And also, the efficiency of piling can be improved, the quality of piling can be ensured and the construction cost can be reduced. The techniques formed in this study are suitable for reinforcing and treating the soft soil foundation which needs to meet the construction requirement of superstructure fast loading. |
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| Keywords: | sinking-pipe gravel pile steel pile boots three-pipe form dry filling visualization vibration compactness |
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