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A rigid truck with no headboard carries 10 tonnes of rigid packets, each at least 0.5 tonne, secured by two tie downs. What minimum combined rated strength is needed?
没有前挡板的刚性卡车，载有共10吨、每包至少0.5吨的刚性货物，用两条捆绑装置固定。合计额定强度至少是多少？
Without a headboard, the rigid packets described need lashings with combined rated strength of at least twice the load's weight: 20 tonnes for a 10-tonne load.
无前挡板的刚性货物，捆绑装置合计额定强度至少为货物重量2倍；10吨货物需至少20吨。
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This calculation applies to packets weighing at least 0.5 tonne each. Correct lashing methods, suitable anchor points and the performance of the complete restraint system remain essential.
本题按每包至少0.5吨的刚性货物计算。额定强度还须与正确捆绑方式、合适锚固点及完整约束系统配合。