









Pilot hole
Tapping hole
Core hole
Three problems on the depression test of Yantan outlet are discussed.
The construction practice proves that the grouted concrete strength higher th an the normal concrete strength.

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Open the tool →底孔 (dǐ kǒng) means “Pilot hole, Tapping hole, Core hole”.
底孔 is pronounced dǐ kǒng in Mandarin Chinese.
“Pilot hole” is 底孔 (dǐ kǒng) in Chinese.
This page has 2 example sentences using 底孔, each with pinyin and an English translation.