Analysis of deviation angle of hydraulic grab for diaphragm wall in the construction of clay loam strata
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摘要: 在液压抓斗进行地下连续墙施工过程中，斗体需要保持一定的垂直度以保证侧壁成槽精度。抓斗掘削部与土体相互作用时，作用于斗体上的载荷具有瞬态多向性且不均匀，由此导致钢丝绳下放的斗体发生偏斜，成槽壁面垂直度受到破坏。本文建立了液压抓斗多体动力学模型和粘壤土地层模型，通过多体动力学和离散元相结合的方法分析了液压抓斗在粘壤土地层施工过程中斗体倾斜情况，设计了电液比例调速回路以控制液压抓斗主液压缸运动，通过联合仿真重点讨论了主液压缸控制信号对斗体偏斜过程的影响，为进一步研究液压抓斗纠偏系统及控制策略提供依据。Abstract: During the construction of diaphragm wall using hydraulic grab, the grab needs to maintain vertical to ensure the accuracy of the side wall trench formation. When the excavation part of the grab interacts with the soil, the load acting on the grab has the characteristics of transient multidirectivity and non-uniformity, which leads to the deviation of the grab lowered by the steel rope and damages of the verticality of the trench wall surface. This article established a multi-body dynamic model of hydraulic grab and a clay soil layer model. Through the combination of multi-body dynamic and discrete element method, the tilt of the grab during the construction process of the hydraulic grab in the clay soil layer is analyzed, and an electro-hydraulic proportional speed control circuit to control the movement of the main hydraulic cylinder of the hydraulic grab is designed. Through joint simulation, the influence of the control signal of the main hydraulic cylinder on the tilt process of the grab is emphatically discussed, which provides a basis for further research on the hydraulic grab deviation correction system and control strategy.
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