Elevator shaft problem on permanent basis

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Hello everyone, take it easy guys..in a project I'm doing right now, I couldn't open an elevator shaft because of the foundations. I constantly removed the foundations that coincided with the elevator shaft and connected the other foundations with tie beams. My question is: I opened an elevator shaft by defining a sub-basement curtain under the tie beams, but there is a problem in workmanship. does it? So is it applicable? Thanks in advance for your answers...