求翻译：当混凝土初凝后开始对工型梁进行养护, 用潮湿的草席、麻袋覆盖, 并经常浇水保持混凝土表面经常处于湿润状态, 且不少于7d。是什么意思？

When the initial setting of concrete conservation began working beam, wet mats, gunny bags, cover, and frequent watering to keep the concrete surface, often in a moist state, and not less than 7d.

When concrete is beginning to gel-type beams for conservation work, the wet sack of straw mats, coverage, and maintain regular watering frequently in wet concrete surface, and no less than 7 d.

After at the beginning of the concrete congeals starts to carry on the maintenance to labor Liang, with the moist straw mat, the gunnysack cover, and waters the maintenance concrete surface to be at the moist condition frequently frequently, also many in 7d.

When preset start after I type beam concrete curing, the mats, sacks covered with moist, and regular watering in the concrete surface in moist State, and not less than 7d.

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