挖掘船为了能挖掘水下足够深度的砂矿,需要在平底船船首部开槽,使斗桥在开槽中提升或下放。开槽长度对挖掘船生产有明显的影响。开槽长度小,会碰坏船体或采挖不到底、金属损失增加,开槽长度大,会削弱平底船的结构强度、减少排水量并减少斗下捕收器面积,也会增加金属损失。一般说来,开槽长度与最大挖深H_(max)、干舷高度h、上导轮轴线标高h、过上导轮轴线的 Excavation vessels In order to excavate sand of sufficient depth below the water, grooves are required at the bow of the gondola to raise or lower the bridge in the groove. Slotting length has a significant impact on the production of dredging vessels. Slot length is small, will hunt the hull or dig less than the end of the metal loss increases, the slot length, will weaken the structural strength of the punt, reduce the displacement and reduce the collector area under the bucket, will increase the metal loss. In general, the slot length and maximum depth of excavation H_ (max), freeboard height h, the upper guide wheel axis elevation h, over the guide wheel axis