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Question:

Why should the two middle walls of the elevator shaft be brick walls?

Why should the two middle walls of the elevator shaft be brick walls?

Answer:

If it is a fire elevator a common passenger elevator, in accordance with the fire code, fire ladder must have an independent closed shaft and the engine room, so do partition wall, as is the brick wall or block wall, see the site.
The general situation of the tunnel, if the two elevators are fire ladder or not fire ladder, the middle of the interval can do block walls, brick walls, or only support the ring beam, not solid can be.

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