求翻译：主斜井混凝土底板需待主斜井施工到位，拆除掘进用临时皮带后才能进行铺底施工，施工时采用由下向上倒退的方式进行。具体施工时间根据矿总体安排进行。是什么意思？

Main shaft main shaft of concrete floor construction must be in place, remove the belt before heading to a temporary BEDDING construction, the construction of the use of bottom-up way back. Mine the overall construction time according to the specific arrangements.

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Main inclined shaft concrete base plate needed to be main inclined shaft construction in place, heading temporary demolition belt to bed after construction, used from bottom up construction regressive manner. Overall arrangement of actual construction time under mine.

Main shaft main shaft of concrete floor construction must be in place, remove the belt before heading to a temporary BEDDING construction, the construction of the use of bottom-up way back. Mine the overall construction time according to the specific arrangements.