The object of this patent is the method to manufacture a building construction part as well as the building construction part made using this method and how it can be used.

The known wooden building construction parts: the walls, ceiling or floor usually have structures which have a separate supporting structure with covering and insulating structures which are attached to the supporting structure with fastening systems. In addition to this, due to the manufacturing methods and measuring of wooden construction standard parts, these building construction parts are mainly rectangular building construction parts, made of straight boards or other rectangular building construction parts of different strengths. If a free-form building construction part is required, it is made of a separate frame and bent wooden boards or battens.

The object of this invention is to remove this restriction and to achieve a wooden building construction part, which has a free-form appearance and which is at the same time supporting and rigid without a separate supporting or stiffening structure.

This object can be achieved when the building construction part is made of a wooden board by milling, sawing or otherwise dimensionally exactly removing it, and by attaching several of these shaped pieces on top of each other in such a way that the end result can be used as a building construction part: as a supporting outer wall or partition wall, a base for the top, for the centre or for the bottom, or as another building construction part, in such a way that it is either rigid and supporting or only rigid due to its manufacture, in which case it can be attached to the supporting frame of the building. The shaped pieces, which form a building construction part after they are attached to each other, can be of the same shape or of a different shape. Attached on top of each other in this application means that the straight level surfaces of the shaped pieces are attached to each other horizontally. The rigidity and supportiveness required with the manufacturing process is achieved by using curved shapes and by increasing the material strength of the construction piece at required points. The material strength of a building construction part or a piece in this application means the measure of the building construction part or piece vertically against the board's cutting direction when level with the sheet, and it is hereby called horizontal material strength or material strength on a horizontal level. The shaped pieces are attached to each other mainly by gluing or using other fastening systems. The glue being used is determined according to the purpose of use of the building construction part and according to the wooden board being used. Due to this method the shape of the building construction part is free-form. Usually the wooden board to be used is plywood, adhesive wooden board, Kerto or a woodchip board. The board thicknesses vary between 20mm and 75mm depending on the board. The building construction part in this invention can be either a separately designed and measured unique piece, or a standardised part.

The characteristics for the building construction part according to the invention are presented in the characteristic part of the patent claim 1 , and for the method according to the invention in the characteristic part of the patent claim 6.

The following describes the invention in more detail by referring to the figures 1 , 2 and 3, which describe three different applications for the building construction part.

Fig.1: the building construction part, here a wall (3), is made of 60 pieces milled from 51mm thick Kerto boards (2), which are pieces (1) of similar shape of an even material strength and which are glued together. The curvature of the milling form is sufficient to make sure that the structure is rigid and supportive. The calculated definition for the bearing capacity and rigidity must be always performed separately for each free-form building construction part in order to achieve the sufficient and satisfactory standard.

Fig.2: the building construction part, here a wall (3), is made of 60 pieces milled from 51mm thick Kerto boards (2), which are pieces of similar shape (1) and glued together. The milling shape curvature and the increases (4) made to the material strength used as additional reinforcement at required points, are sufficient to ensure that the structure is rigid and supportive. The calculated definition for the bearing capacity and rigidity must be always performed separately for each free-form building construction part in order to achieve the sufficient and satisfactory standard.

Fig.3: the building construction part, here a wall (3), is made of 60 pieces milled from 51mm thick Kerto boards (2), which are pieces of similar shape (1) and glued together. The curvature and the cell-like structure of the milling shape with attachment points (4) binding the outer and inner frame are sufficient to ensure that the structure is rigid and supportive. The calculated definition for the bearing capacity and rigidity must be always performed separately for each free-form building construction part in order to achieve the sufficient and satisfactory standard. The building construction parts of the invention can have openings, smaller drillings and lead-ins, which serve house construction requirements, for example, and can be openings such as those for a window or a door. With cell-structure the cell can be used separately as a place for insulation material.