Method for joining fiber-reinforced plastic components and stabilizing device

A method for joining fibre-reinforced plastic (FRP) components, comprising the following steps:

• i) Providing a first and a second FRP component, the first FRP component having a recess;
• ii) Inserting a stabilizing device into the recess of the first FRP component, wherein the stabilizing device has a preferably elongated base body with a cavity, an opening and a pressing element, said pressing element has, at least partially, a higher flexibility than the base body, wherein the pressing element has a bag which is arranged inside the cavity and can be filled with a fluid in order to generate a pressure force, wherein the bag in the filled state is configured to protrude at least partially through the opening in order to generate the pressure force on a delimiting surface of the first FRP component delimiting the recess, wherein the pressing element further has a heat-insulating element, which is arranged on the outside of the base body, such that the pressure force can be transmitted to the first FRP component via the heat-insulating element;
• iii) Filling the cavity with the fluid such that the pressing element is pressed against the delimiting surface of the first FRP component, which delimits the recess;
• iv) Connecting the first FRP component to the second FRP component by joining at a connecting point, wherein the pressure force, which is directed towards the outside, is exerted onto the connecting point by means of the pressing element for stabilizing the shape of the recess.