Guide rail straightness measuring system for elevator installations

An elevator arrangement comprising:

• at least one temporary installation platform configured to move vertically in an elevator runway along a guide rail to transport at least one sensor arrangement along the guide rail, the guide rail configured to extend vertically along at least a part of the elevator runway;
• and
• a measuring system configured to measure a straightness of the guide rail, the measuring system including at least one plumb line mounted vertically in the elevator runway adjacent to the guide rail, and the at least one sensor arrangement, the at least one plumb line being fixed vertically in the elevator runway between an upper end and a lower end of the elevator runway, and the at least one sensor arrangement including,
• a frame,
• at least one guide shoe connected to the frame, the guide shoe configured to move along a guide surface of the guide rail,
• a biasing device configured to bias the frame against the guide surface, and
• at least one sensor configured to sense a position of the plumb line with respect to the frame.

A method for building up elevator guide rails whose straightness is measured via a measuring system, the method comprising:

• mounting the elevator guide rails in an elevator shaft by visually aligning the elevator guide rails along plumb lines located vertically in the elevator shaft, and fixing, via brackets, the elevator guide rails to an elevator runway at a mounting location, the brackets configured to allow an adjustment of the mounting location of the elevator guide rails in a horizontal plane;
• moving a sensor arrangement including at least one sensor along the elevator guide rails via a temporary installation platform such that the at least one sensor is transportable along the elevator guide rails via the temporary installation platform;
• and
• adjusting mounting positions of the elevator guide rails based on data provided by the measurement system, the adjusting including opening, readjusting and fixing the brackets such that the elevator guide rails are fixed at a final one of the mounting positions indicated as an exact alignment by the measuring system.