A system and method for creating a column for construction using bundled tube are provided. The column having a bottom portion, a middle portion, and a top portion. Each portion consists of a bundle of individual pillars, comprising a center pillar, a plurality of corner pillars, and a plurality of middle pillars. From the bottom portion of the column, addition pillars can be affixed on top of the pillars of the bottom portion, thus forming the middle and the top portion of the column. Each pillar can be secured to another component using a thread stepped dowel comprising of a base section, at least one middle section, and a tip section, with each section being progressively smaller in circumference than the last. The at least one middle section of the threaded stepped dowel further comprises thread spiraling around the outer surface of the at least one middle section.

A set including a first panel, a second panel and a mechanical locking device for locking the first panel to the second panel, the mechanical locking device includes an insertion groove at the second edge surface, a flexible tongue positioned in the insertion groove and an edge tongue including a tongue groove, the flexible tongue includes a first locking surface and a second locking surface, the first locking surface is configured to cooperate with the tongue groove for locking of the first panel to the second panel in a first direction when the flexible tongue is positioned in the insertion groove in a first orientation, the second locking surface of the flexible tongue is configured to cooperate with the tongue groove for a locking of the first panel to the second panel in a first direction when the flexible tongue is positioned in the insertion groove in a second orientation.

A set including a first panel, a second panel and a mechanical locking device for locking the first panel to the second panel, the mechanical locking device includes an insertion groove at the second edge surface, a flexible tongue positioned in the insertion groove and an edge tongue including a tongue groove, the flexible tongue includes a first locking surface and a second locking surface, the first locking surface is configured to cooperate with the tongue groove for locking of the first panel to the second panel in a first direction when the flexible tongue is positioned in the insertion groove in a first orientation, the second locking surface of the flexible tongue is configured to cooperate with the tongue groove for a locking of the first panel to the second panel in a first direction when the flexible tongue is positioned in the insertion groove in a second orientation.

A coupling element includes at least one coupling member having a first end and a second end, wherein the coupling member has a flat face on a first side thereof, at least one barb extending in cantilever manner from the flat face and depending away from the first end so as to hinder or prevent the removal of the coupling element from a bore in a surface of a first article into which the coupling member has been inserted from the first end.

A coupling element includes at least one coupling member having a first end and a second end, wherein the coupling member has a flat face on a first side thereof, at least one barb extending in cantilever manner from the flat face and depending away from the first end so as to hinder or prevent the removal of the coupling element from a bore in a surface of a first article into which the coupling member has been inserted from the first end.

A set of panels including a first panel with a first main plane and a second panel with a second main plane is described. The first panel and the second panel are provided with a mechanical locking device for locking of a first edge of the first panel to a second edge of the second panel at a junction plane, wherein the first main plane is essentially perpendicular to the second main plane and the junction plane is extending at an angle to the first main plane and the second main plane between the first main plane and the second main plane.

A set of panels including a first panel with a first main plane and a second panel with a second main plane is described. The first panel and the second panel are provided with a mechanical locking device for locking of a first edge of the first panel to a second edge of the second panel at a junction plane, wherein the first main plane is essentially perpendicular to the second main plane and the junction plane is extending at an angle to the first main plane and the second main plane between the first main plane and the second main plane.

A dowel includes a body having a composition of polystyrene and possible glass filling or other material compositions Such a body further has a chamber with an axial bore extended along an entire longitudinal length thereof. A first slot begins from a proximal end of the body and terminates at approximately a midpoint of the longitudinal length of the body. A second slot begins from a distal end of the body and terminates at approximately the midpoint of the longitudinal length of the body. The first and second linear slots are axially offset to improve chamber compression and a series of ridges outer surface is provided to improve connectivity between to objects.

A dowel includes a body having a composition of polystyrene and possible glass filling or other material compositions Such a body further has a chamber with an axial bore extended along an entire longitudinal length thereof. A first slot begins from a proximal end of the body and terminates at approximately a midpoint of the longitudinal length of the body. A second slot begins from a distal end of the body and terminates at approximately the midpoint of the longitudinal length of the body. The first and second linear slots are axially offset to improve chamber compression and a series of ridges outer surface is provided to improve connectivity between to objects.

A connection arrangement for panels including a first panel having a first main plane and a second panel having a second main plane. The first main plane is essentially perpendicular to the second main plane in a connected state. The second panel includes a groove on a first face adapted to receive a first edge of the first panel. The connection arrangement includes an elongate flexible tongue element arranged in an elongate insertion groove in the first panel at an angle of less than 45° relative the first main plane and arranged to cooperate with an elongate tongue receiving groove arranged in the groove of the second panel for connecting the two panels to one another. The elongate insertion groove and the elongate flexible tongue element are configured to extend through the plane of the first face of the second panel when the two panels are in a connected state.