Method and system for establishing a sectional or modular wind turbine blade and a mobile factory for joining sections of a wind turbine blade

1. A method for establishing a sectional or modular wind turbine blade ( 6 ), said method comprises the steps of:

transporting at least two blade sections ( 8 , 7 ) of said wind turbine blade and a mobile factory ( 20 ) for joining blade sections to a location at or in proximity of a wind turbine site;

positioning said at least two blade sections with two blade section ends facing each other and supported on a common one-piece platform ( 12 ) in said mobile factory;

moving said common one-piece platform in relation to the ground at the location for levelling said common one-piece platform, wherein said common one-piece platform ( 12 ) is moved by one or more platform support actuators connected to the common one-piece platform ( 12 ) while standing on the ground ( 13 );

aligning said blade section ends in relation to each other; and

establishing said sectional or modular wind turbine blade by joining said at least two blade sections in an area of connection ( 9 ) at said blade section ends.

2. The method according to claim 1 , wherein at least two support cradles ( 28 , 29 ) on said common one-piece platform support said blade section ends.

3. The method according to claim 2 , wherein said blade section ends are aligned in relation to each other by rotating, lifting and/or lowering said at least two support cradles.

4. The method according to claim 2 , wherein said at least two support cradles are moveable horizontally on said common one-piece platform.