在海上升压站导管架钢管桩基础水下沉桩施工过程中,受导管架套筒喇叭口与打桩锤锤帽干涉影响,需在钢管桩与锤帽之间增设送桩器作为替打工装。送桩器长期承受大能量锤击载荷,使用寿命尚不明确。针对该问题,以某海上升压站导管架沉桩施工为研究背景, 基于一维纵波理论对送桩器冲击应力进行求解,通过使用Solidworks软件建立送桩器模型,对其在承受不同周期性冲击载荷下的应力分布及疲劳损坏情况进行数值模拟,并通过高应变监测设备获取结构实时应力数据进行对比。结果表明：送桩器在不同冲击能量下的最大应力位置相同,送桩器疲劳寿命与冲击能量呈反比例指数关系,送桩器模拟应力值与高应变监测应力值的误差在考虑能量消散比例后仅为2.77%。
Abstract
Due to the interference between jacket sleeve and hammer during underwater piling of offshore booster station, a pile follower should be installed between pipe pile and hammer. The service life of pile follower, which has been subjected to large energy hammer load for a long time, is not clear as yet. To solve this problem, the piling of an offshore booster station jacket is taken as the research background, the impact stress of pile follower is solved based on one-dimensional longitudinal wave theory, and pile follower model is established by using Solidworks software. The stress distribution and fatigue damage of the pile follower under periodic impact load are simulated numerically, and the real-time stress data of pile follower is obtained by high-strain monitoring equipment. The results show that the maximum stress position of pile follower is same under different impact energy, and the fatigue life of pile follower is inversely proportional to impact energy. The error between simulated stress value of pile follower and high-strain monitoring stress value is only 2.77% after considering energy dissipation.
关键词
海上风电 /
送桩器 /
冲击应力 /
疲劳分析 /
数值模拟
Key words
offshore wind power /
pile follower /
impact stress /
fatigue analysis /
numerical simulation
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