stack supports on either side of the stack retract (they disappear into the front and rear wall), the low pressure valve in the air supply of the lift is bypassed by the opening of a second valve that applies high pressure. the entire weight of the stack is then transferred onto the vertical lifting plates...
smooth mould surface. the central beam is raised from loops located at the edges of the elements or from female thread sleeves located in the treads. the railings are attached to the female thread sleeves m located on the side of the treads. weight of stair elements tr /kt/ : central beam ~ kg + tread plates...
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