摘要
为了提高自航耙吸挖泥船耙头疏浚饱和硬质土时的效率,根据模型相似的原理推导了耙头的局部模型试验方法,并通过该方法试验了不同位置高压冲水辅助下的挖掘效果,分析了垂直高压冲水和耙齿内高压冲水在耙齿挖掘中的作用,并根据两种高压冲水的作用机理,提出了沿齿面冲水的辅助挖掘新型式,进一步提高了耙头的挖掘能力和疏浚效率,同时降低了耙头的挖掘阻力。研究了耙齿对地压力、耙头吸腔密封度等因素的影响,并做出了调整和改进。结果表明,改进后的模型耙头疏浚坚硬的黄骅港密实砂质粉土时,泥浆密度换算到原型耙头可达1.19 t/m3,相对于国内现有耙头同类土质下的施工密度1.10 t/m3已有大幅提高。
In order to improve the dredging efficiency of drag-heads on trailing suction hopper dredgers （TSHD）, especially for excavating saturated stiff clay, a partial model experiment was introduced by authors based on the theory of similarity. With the model, they tested the excavating effects with the assistance of high pressure jets at different positions, and the function of vertical jets and jets inside the drag-teeth during dredging was analyzed. According to functional mechanism of these jets, authors put forward a new jet, which flushed along drag-teeth, improved both excavating capability and dredging efficiency, and also reduced cutting resistance. In addition, the influence of drag-teeth＇s pressure against riverbed and sealed degree of the draghead were also tested, and some adjustments and improvements were made. The results showed that when dredging fine hard compacted sand from Huang-Hua harbor, the improved model draghead could achieve a high slurry concentration of 1.19 t/m3, which was significantly enhanced compared to using most domestic draghead used nowadays.
出处
《中国港湾建设》
北大核心
2008年第4期19-22,86,共5页
China Harbour Engineering
关键词
自航耙吸挖泥船
耙头
局部模型试验
高压冲水
trailing suction hopper dredger （DSHD）, draghead, partial model experiment, high pressure jets
