锚链式抓斗挖泥船大潮流下拆除石坝施工工艺

Construction technology for rock dam removal by anchor chain grab dredger in high current

针对抓斗船在强潮流工况下(潮流流速3~4 m/s)拆坝施工时,面临的泥驳靠船困难、抓斗船走锚严重、挖掘石头存在抓斗夹缝、抓斗充盈量少、块石过大抓斗无法抓取等问题。本文在抓斗船布锚、施工区分段、抓斗船下抓工艺、超大块石的破碎等方面进行研究,通过对抓斗船增设行走锚、调整抓斗船施工方向和施工分段、改变抓斗下抓方向、抓斗船凿岩锤破碎后抓斗清石等措施,解决抓斗船拆除石坝施工中下锚受限、泥驳靠离受限、走锚严重以及挖掘困难等问题,扩大抓斗船工程施工的适应性,使抓斗船日产量提高40%以上,可为类似吹填工程提供一定借鉴。

Grab dredgers encounter various problems during dam removal construction in strong currents(current velocity of 3-4 m/s),such as difficult docking for barges, serious anchor dragging of grab dredgers, excavated rocks stuck in grab cracks, insufficient fullness of grabs, inability to grab overlarge block stones. To solve the above problems, this paper studies the anchor distribution of a grab dredger, the segmentation of the construction area, the grabbing process of the grab dredger, and the crushing of super-large block stones. By taking various measures, such as adding a traveling anchor to the grab dredger, adjusting the construction direction of the grab dredger and the construction segmentation, changing the grabbing direction of the grab, and cleaning the rock with the grab after it is crushed by the rock hammer of the grab dredger, this paper solves the problems of restricted anchoring, restricted barge docking and separation, serious anchor dragging, and difficult excavation during the construction of rock dam removal by a grab dredger. Moreover, the paper expands the adaptability of grab dredgers to project construction and increases the daily output of the grab dredger by more than 40%. It can provide a reference for similar hydraulic reclamation projects.