Method for renovating the interior of a hollow structure

Method for renovating the interior of a hollow structure, the method comprising providing an access opening to the hollow structure;

• providing a plurality of material sheets comprising reinforcing fibers and a curable resin composition of thermosetting type, the resin composition comprising an unsaturated polyester and/or vinylester resin/hardener mixture, wherein the curable resin composition of the material sheets is partially cured by comprising a thickening agent and thickening the resin composition before providing the material sheets against the wall, providing the plurality of material sheets through the access opening and against a wall of the hollow structure;
• providing an inflatable pressure means within the hollow of the structure;
• inflating the pressure means against the wall;
• providing a curing means within the hollow of the structure for curing the resin composition;
• and curing the resin composition to harden the material sheets and provide a renovated interior of the hollow structure, and wherein the material sheets are secured against a wall of the hollow structure by applying fastening means.

Method for renovating the interior of a hollow structure, the method comprising providing an access opening to the hollow structure;

• providing a plurality of material sheets comprising reinforcing fibers and a curable resin composition of thermosetting type, the resin composition comprising an unsaturated polyester and/or vinylester resin/hardener mixture, wherein the curable resin composition of the material sheets is partially cured by comprising a thickening agent and thickening the resin composition before providing the material sheets against the wall, providing the plurality of material sheets through the access opening and against a wall of the hollow structure;
• providing an inflatable pressure means within the hollow of the structure;
• inflating the pressure means against the wall;
• providing a curing means within the hollow of the structure for curing the resin composition;
• and curing the resin composition to harden the material sheets and provide a renovated interior of the hollow structure, and wherein the wall of the hollow structure comprises holes and said holes are covered before applying the material sheets.

Method for renovating the interior of a hollow structure, the method comprising providing an access opening to the hollow structure;

• providing a plurality of material sheets comprising reinforcing fibers and a curable resin composition of thermosetting type, the resin composition comprising an unsaturated polyester and/or vinylester resin/hardener mixture, wherein the curable resin composition of the material sheets is partially cured by comprising a thickening agent and thickening the resin composition before providing the material sheets against the wall, providing the plurality of material sheets through the access opening and against a wall of the hollow structure;
• providing an inflatable pressure means within the hollow of the structure;
• inflating the pressure means against the wall;
• providing a curing means within the hollow of the structure for curing the resin composition;
• and curing the resin composition to harden the material sheets and provide a renovated interior of the hollow structure;
• and further comprising providing an inflatable preform that comprises the material sheets, which preform is configured to substantially conform to the interior shape of the hollow structure when inflated outside the hollow structure;
• which preform also acts as the inflatable pressure means;
• and wherein the material sheets of the preform are contained in an envelope comprising an inner covering layer facing the inside of the preform and an outer covering layer facing the outside of the preform.