Method for manufacturing a structural element of a wind turbine blade, method for manufacturing a wind turbine blade, structural element of a wind turbine blade and wind turbine blade

A method for manufacturing a structural element of a wind turbine blade, the method comprising:

• (a) providing a first portion of the structural element and a second portion of the structural element, whereby each of the first portion and the second portion comprise a core material;
• (b) arranging an end of the core material of the first portion to face an end of the core material of the second portion, whereby a gap is formed between the end of the core material of the first portion and the end of the core material of the second portion;
• (c) providing laminates on top sides of the core materials of the first portion and the second portion and on bottom sides of the core materials of the first portion and the second portion, whereby a cavity enclosing the gap is formed between the end of the core material of the first portion, the end of the core material of the second portion and at least two of the laminates;
• (d) forming at least one injection hole in at least one of the laminates, so that the at least one injection hole is fluidically connected to the cavity;
• (e) injecting adhesive through the at least one injection hole into the cavity, curing the adhesive injected into the cavity and thereby forming a structural joint between the end of the core material of the first portion and the end of the core material of the second portion;
• and
• (f) arranging at least one intermediate piece connecting the end of the core material of the first portion with the end of the core material of the second portion, wherein the at least one intermediate piece comprises spacers on a surface, whereby the spacers create space for the cavity between the intermediate piece and the end of the core material of the first portion and between the intermediate piece and the end of the core material of the second portion.