Method for constructing elevator

1. A method for constructing an elevator comprising

constructing a movable machine room in a bottom end of a hoistway formed in a building under construction, wherein the constructing includes placing a first submodule including a support platform into the bottom end of the hoistway, assembling a second submodule including a vertically extendable support structure to the support platform and assembling a third submodule including a working platform to the vertically extendable support structure; and thereafter

hoisting the movable machine room; and

constructing an elevator car in the bottom end of the hoistway below the movable machine room; and

providing a counterweight in the bottom end of the hoistway below the movable machine room;

connecting the elevator car and the counterweight with a suspension roping; and thereafter

hoisting the movable machine room to a first transport position; and thereafter

mounting the movable machine room to the first transport position in the hoistway vertically supported on stationary structures; and thereafter

using the elevator car for transporting passengers and/or goods below the movable machine room while the movable machine room is mounted in said first transport position; and thereafter

hoisting the movable machine room upwards to a second transport position; wherein the second transport position is higher than said first transport position; and thereafter

mounting the movable machine room to the second transport position in the hoistway vertically supported on stationary structures; and thereafter

using the elevator car for transporting passengers and/or goods below the movable machine room while the movable machine room is mounted in said second position.

2. A method according to claim 1 , wherein in said constructing a movable machine room, the movable machine room is constructed in the bottom end of a hoistway to rest supported by the floor of the hoistway.

3. A method according to claim 1 , wherein in said constructing an elevator car

the elevator car is constructed above a buffer; and/or

the elevator car is constructed to lean laterally on one or more guide rail lines; and/or

structural parts of the elevator car are installed on a car frame while it is suspended from the machine room by an auxiliary hoist.

4. A method according to claim 1 , wherein the method comprises after using the elevator car for transporting passengers and/or goods, disassembling the movable machine room, the disassembling preferably comprising disconnecting one or more of the sub-modules of the machine room, and constructing a movable machine room in a bottom end of another hoistway.

5. A method according to claim 1 , wherein the support platform includes one or more releasable mounting mechanisms for releasably mounting the moveable machine room in the hoistway, and a hoisting machine mounted on the support platform.

6. A method according to claim 1 , wherein the method comprises, while the movable machine room is in a transport position in the hoistway, using the working platform for installing elevator components from the working platform in the parts of the hoistway above the support platform, said using comprising moving the working platform up and down with the vertically extendable support structure.

7. A method according to claim 6 , wherein said using comprises one or more times actuating the vertically extendable support structure to expand in vertical direction for hoisting the working platform higher above the support platform; and one or more times actuating the vertically extendable support structure to contract in vertical direction for lowering the working platform back towards the support platform.

8. A method according to claim 1 , wherein said vertically extendable support structure comprises an upright mast selectively actuatable to expand or contract in a vertical direction.

9. A method according to claim 1 , wherein said vertically extendable support structure comprises a scissor jack mechanism selectively actuatable to expand or contract in vertical direction.

10. A method according to claim 1 , wherein said support platform comprising one or more releasable mounting mechanisms installed thereon for releasably mounting the moveable machine room in the hoistway.

11. A method according to claim 10 , further comprising a guide for guiding vertical movement of the movable machine room along a vertical guide rail line of the elevator car.

12. A method according to claim 1 , wherein the method comprises mounting vertical guide rail lines in the hoistway for guiding movement of the elevator car and/or the movable machine room.

13. A method according to claim 1 , wherein in said hoisting of the movable machine room, the movable machine room is hoisted with a hoisting arrangement taking support from a support structure mounted in the hoistway above the movable machine room.

14. A method according to claim 1 , wherein each said using elevator car for transporting passengers and/or goods comprises receiving call signals from one or more user interfaces, and moving the elevator car in response to said call signals automatically controlled by an elevator control system.

15. A method according to claim 1 , wherein each said mounting of the movable machine room is performed with at least one releasable mounting mechanism.