A hinged corner for a construction form includes a first flange connected to a first mounting plate for a form member and a second flange connected to a second mounting plate for a form member. The first flange and the second flange pivot relative to one another in an overlapping relationship about a pivot point disposed between the first mounting plate and the second mounting plate.

An adjustable form for installing across an opening at an edge of a concrete slab includes a form member having a first form portion and a second form portion slidably connected to reach an adjustable effective length of the form member. The adjustable form further includes an extension mechanism connected between the first and second form portions and is operable to vary the effective length of the form member to fit across the opening. Tension exerted between the first and second form portions at the effective length is sufficient to keep the adjustable form in place.

An adjustable form for installing across an opening at an edge of a concrete slab includes a form member having a first form portion and a second form portion slidably connected to reach an adjustable effective length of the form member. The adjustable form further includes an extension mechanism connected between the first and second form portions and is operable to vary the effective length of the form member to fit across the opening. Tension exerted between the first and second form portions at the effective length is sufficient to keep the adjustable form in place.

A method and an article of manufacture are disclosed for constructing, reinforcing, and repairing various structural elements such as columns, piles and the like using formworks that are reusable. The reusable articles of manufacture employed in the disclosed methods are or, if desired, may be permanently left in place. Same or similar methods and articles of manufacture may be employed to easily construct pipes of any desired diameter in a very short time.

A method and an article of manufacture are disclosed for constructing, reinforcing, and repairing various structural elements such as columns, piles and the like using formworks that are reusable. The reusable articles of manufacture employed in the disclosed methods are or, if desired, may be permanently left in place. Same or similar methods and articles of manufacture may be employed to easily construct pipes of any desired diameter in a very short time.

A collapsible formwork element, the element including: a pair of opposing side wall panels; and at least one connector member extending between the side wall panels, wherein the formwork element is movable between an expanded configuration, wherein the opposing panels are spaced apart, and a collapsed configuration, wherein the opposing panels are relatively closer together.

A building formwork apparatus includes a building formwork having a frame with a positioning hole and a locking hole, and a locking member including a first tapered section, a second tapered section connected to the first tapered section, and a threaded portion connected to the second tapered section. The positioning hole is configured to receive insertion of the locking member therethrough such that the first tapered section is retained therein and the second tapered section is exposed therefrom for connection with another building formwork apparatus. The locking hole is configured to receive a threaded portion and a second tapered section of a locking member of the another building formwork apparatus.

A building formwork apparatus includes a building formwork having a frame with a positioning hole and a locking hole, and a locking member including a first tapered section, a second tapered section connected to the first tapered section, and a threaded portion connected to the second tapered section. The positioning hole is configured to receive insertion of the locking member therethrough such that the first tapered section is retained therein and the second tapered section is exposed therefrom for connection with another building formwork apparatus. The locking hole is configured to receive a threaded portion and a second tapered section of a locking member of the another building formwork apparatus.

The invention relates to a form element (1), an arrangement comprising such a form element (1) and a method for forming at least part of a formwork for a concrete part using this form element (1), wherein the form element (1) is flexibly three-dimensionally deformable in its first state, and wherein the form element (1) is stiffened and solidified in its second state, in particular in a deformed position of the form element (1), wherein the form element (1) comprises at least two flexible layers (2), which are arranged superimposed in a planar manner, and wherein the layers (2) are connected to each other, in particular reversibly, in the second state to solidify the form element (1).

The invention relates to a form element (1), an arrangement comprising such a form element (1) and a method for forming at least part of a formwork for a concrete part using this form element (1), wherein the form element (1) is flexibly three-dimensionally deformable in its first state, and wherein the form element (1) is stiffened and solidified in its second state, in particular in a deformed position of the form element (1), wherein the form element (1) comprises at least two flexible layers (2), which are arranged superimposed in a planar manner, and wherein the layers (2) are connected to each other, in particular reversibly, in the second state to solidify the form element (1).