Shaft is the throat of mine for a long time,the concrete strength and anti-seep-age of shaft lining as well as the quality of the lining linkage are not ideal.

• 立井是矿井的咽喉，但立井的砼井壁的强度及抗渗性以及接茬处的质量长期以来不尽人意，是井巷工程中急待解决的问题。