Reinforcing sleeve for a coupling, assembly of a reinforcing sleeve and a coupling, method of welding of for instance a multi layer conduit to the assembly

Assembly of a reinforcing sleeve and a coupling,

• the coupling comprising a coupling pipe, the coupling pipe being provided on the outer side with a radially upright wall, the radially upright wall being widened in axial direction at a radial distance from the outer side of the coupling pipe such that the outer side of the coupling pipe, the radially upright wall and a widened portion of the radially upright enclosing an annular insertion space into which an outer end of a conduit or of a welding device is directly insertable, and wherein the radial distance between the widened portion of the radially upright wall and an outer side of the coupling pipe at the position of the entry to the insertion space is such that it is equal to or greater than a wall thickness of the conduit or a thickness of the welding device;
• and
• wherein the reinforcing sleeve is substantially tubular and designed for placing inside the coupling pipe,
• the reinforcing sleeve comprising:
• a slit extending at least in axial direction of the reinforcing sleeve, the slit being enclosed by slit edges of the reinforcing sleeve, the slit edges defining an intermediate space, the intermediate space being variable in that the sleeve takes a flexible and resilient form, and wherein dimensions and a form of the reinforcing sleeve are such that the contour of the reinforcing sleeve is arrangeable inside the coupling pipe and connects closely to an inner wall of the coupling pipe.