vertical shaft; pit
Refers to a vertical or steeply inclined excavation, typically in mining or civil engineering.
The mine shaft is over 500 meters deep.
Special machinery is needed to excavate a vertical shaft.
立坑 denotes specifically a vertical mine shaft, whereas 坑道 covers horizontal galleries as well as shafts.
Standard kanji spelling for a vertical shaft.
Uncommon variant using 縦 (vertical).
Rare spelling with okurigana.
Alternate kanji spelling using 竪 (vertical).
Mixed kana-kanji spelling, rarely used.
Irregular kanji usage; 抗 is not standard for 'shaft'.
Compound of 立 (vertical) and 坑 (pit, shaft).