Assembly of a hollow rail in an elevator shaft of an elevator installation

A method for assembling a hollow rail for guiding an elevator car and/or a counterweight of an elevator installation, the method comprising the steps of:

• arranging a first hollow rail part and a second hollow rail part at different heights in an elevator shaft of the elevator installation;
• aligning the first hollow rail part relative to the second hollow rail part by an alignment piece such that the first hollow rail part and the second hollow rail part extend along a common longitudinal axis, wherein the alignment piece is arranged between the first hollow rail part and the second hollow rail part such that the alignment piece protrudes partially into an open end of the first hollow rail part and protrudes partially into an open end of the second hollow rail part;
• fastening a first clamping element to the first hollow rail part and fastening a second clamping element to the second hollow rail part;
• and
• applying forces to the first and second clamping elements in opposite directions parallel to the common longitudinal axis thereby bringing together the first hollow rail part and the second hollow rail part to form the hollow rail, wherein the alignment piece is pressed into the open end of the first hollow rail part and/or into the open end of the second hollow rail part.