求翻译：8）防水结构施工是什么意思？

8) The waterproof structure construction

8) waterproof structural construction

8) waterproof structure construction

8) construction of waterproof structure

After excavates and initially spurts the concrete the prompt installment.The steel centering with initially spurts the coagulation soil surfaced road the gap to have to use the shotcrete backfill to be dense.When gap oversized, the available steel template or the concrete voussoir go against tightly