A pure wood connection structure, having pure wood units, self tapping screws, a first pure wood edge sealing unit and a second pure wood edge sealing unit; an upper side and a lower side of each pure wood unit are provided respectively with a contraction slit, and are applied with wood adhesives; in each pure wood unit, the self tapping screws are screwed into the pure wood unit from the contraction slit on the upper side, through the contraction slit on the lower side, and down into the upper side of an adjacent pure wood unit, so that the upper side of each pure wood unit is connected with the lower side of a corresponding adjacent pure wood unit; all the pure wood units are likewise mutually connected one adjacent to another to form a board structure.

A panel member for a cyclorama includes a concavo-convex body having integrally-formed first and second side portions with an intermediate portion therebetween. The first side portion, the second side portion, and the intermediate portion have a radius of curvature in a Y-Z plane, and the first and second side portions have a radius of curvature in an X-Y plane that is different from the radius of curvature in the Y-Z plane to uniformly reflect or diffuse sound and light incident on the panel member.

A panel having a base portion having at least one sidewall extending therefrom, the sidewall extending away from the base portion at a first predetermined angle, the first predetermined angle formed by a die having a second predetermined angle, the second predetermined angle being 1 to 12 degrees smaller as compared to the first predetermined angle so as to overbend the panel during the forming process, the panel relaxing to the first predetermined angle after the panel as entirely cooled after the forming process.

A method of expanding an elongated and at least regionally planar metal element that has two respective marginal regions oppositely disposed and extending in a longitudinal direction and a central region arranged therebetween and including cuts, the marginal regions of the metal element are moved apart transversely to the longitudinal direction and in parallel with a planar extent of the metal element such that connection portions of the central region formed by the cuts and connecting the two respective marginal regions to one another are folded, the method includes displacing the two respective marginal regions with respect to one another transversely to the planar extent of the metal element to form a displaced state, and subsequently moving apart the two respective marginal regions in the displaced state.

A variety of storage structures may be constructed onsite entirely from pre-fabricated parts reducing labor and time required for assembly.

A duct that, in cross section, has one or more rounded portions is disclosed together with a method and a machine for producing it. The duct can be made from rigid foam panels with a facing on at east one side of the panels. A crimping element is used to form several substantially parallel indentations or crimps on a faced side of a panel, without breaching the facing, so that the crimped panel can be manipulated to form a section of duct with the crimps extending longitudinally. Depending on the number of crimps, the duct will appear more or less round in cross section although the crimped foam panels can be manipulated to have cross sections of different shapes such as oval. Adjacent duct sections may be joined, for example, with tape or bands, several of which are described.

Described herein is a drywall apparatus including drywall liner. A first gypsum-containing segment is disposed on an internal side of the drywall liner, and a second gypsum-containing segment is disposed on the internal side of the drywall liner such that a groove exists between the first segment and the second segment. The drywall liner connects the first segment to the second segment such that the first segment and the second segment are capable of hinging about a hinge axis parallel to the groove.

The invention relates to a method for the cambering of a wooden element, comprising the steps of: cutting to form at least one incision in a surface of the wooden element; inserting an expansive material into the at least one incision of the wooden element; letting the expansive material expand in the at least one incision so that a cambering of the wooden element is achieved.

A structural element including a substantially flat central portion, a first web portion perpendicularly extending from an edge of the central portion, and a second web portion perpendicularly extending from an opposing edge of the central portion. The central portion and the first and second web portions are formed from a unitary steel sheet. The structural element is suitable for forming load bearing floors and/or walls in a structure.

An exemplary foam insulation board includes a plurality of insulation panels hingeably connected by hinged portions. The foam insulation board has a folded configuration and an unfolded configuration. The hinged portions allow the insulation panels to fold flat against each other in the folded configuration. The plurality of insulation panels includes a first insulation panel and a plurality of additional insulation panels, one of which is adjacent to the first insulation panel. The first insulation panel also includes a starter portion that extends beyond at least the adjacent insulation panel of the additional panels.