A lot of housing elevator shaft why have set up before and after the hole, obviously only one elevator front room, behind the structure of the hole to open what he used to do? Or in order to reduce the structural stiffness? Or in order to reduce the load? Seek the design elite to give thanks Thank you
In order to open the door on both sides, especially the cargo ladder. This is usually used to open the door before and after, mainly spare
This situation should be spare, there are some for the elevator through the door design
The elevator shaft is handled according to the elevator company design, and the elevator design is needed according to the elevator. Generally before and after leaving the hole, that is, the elevator front and rear doors. I touched the elevator a lot, there are a lot of left and right are not left to die
