The disclosure presents a composite conduit formwork structure which includes a cylindrical outer casing adapted to bond with a cylindrical inner casing which are maintained at a fixed distance apart by a plurality of radial stanchions. The inner casing and outer casing form an interior void which is filled with concrete during manufacture. The outer casing and inner casing remain in place to protect the structure once completed. A novel method of assembly is also provided whereby radial stanchions are rotated between the outer casing and inner casing. All of the components in a preferred embodiment are formed of a fiberglass material.

A method for obtaining a concrete construction element by additive manufacturing, in which superposed mortar layers are successively deposited so as to form two wall surfaces, opposite one another, so as to form a cavity, as well as a plurality of reinforcement elements each extending from one of the wall surfaces toward the cavity, each reinforcement element being in contact with neither the wall surface opposite to that from which it extends, nor with a reinforcement element extending from the opposite wall surface to that from which it extends.

A tie bar for fixing opposing steel meshes in a shear wall is provided. The shear wall includes a first steel mesh and a second steel mesh. The first steel mesh and the second steel mesh are spaced apart by a predetermined distance. The tie bar includes a first end portion, a second end portion, and two connections. The first end portion is configured to surround and be fixed to two adjacent vertical bars of the first steel mesh. The second end portion includes two free ends, and these two free ends are configured to respectively be fixed to two adjacent vertical bars of the second steel mesh. The two connections connect the first end portion and the second end portion respectively.

A concrete wall has a back surface supported by a back panel while a decorative material is applied to an opposing front surface of the wall by hand or by pneumatic projection while the surface is still plastic, and without using bonding agents. The decorative material may be further exposed by a surface treatment before or after the front surface is floated and finished, with a sealant optionally applied thereafter. The front surface may be created by pneumatic methods or by pouring concrete into forms and removing the front panel to expose the front surface while it is still plastic but hydrated enough not to slump.

A modular form system for constructing insulated concrete walls comprises spaced apart vertical frame members which include retention structures allowing for the insertion of spaced-apart rows of insulated panels to form an internal cavity into which concrete may be poured. The retention structures may include flanges on the periphery of the frame members and plates positionable in opposition to the flanges. The insulated panels are retained between the flanges and the plates.

Disclosed herein is a permanent rammed earth formwork-faade, including two parallel side panels, a plurality of galleys and/or rebars fastened transversally between the two side panels interconnecting the two side panels to each other, and a plurality of -shaped fasteners fastening the plurality of galleys between the two side panels and receiving rebars connecting side by side adjacent side panels of two or more of the permanent rammed earth formwork-facades in large formwork-facades. Each side panel includes a double-layered rammed earth wall reinforced by a mesh network there inside, a barbed wire woven into the mesh network, a plurality of rebars fastened to the mesh network, and a plurality of L-shaped anchor bolts fastened to the mesh network, a respective -shaped fastener, and a respective rebar. Each side panel further includes a water-proof thermal insulator layer coated on an interior surface of the double-layered rammed earth wall.

A system and method for positioning and retaining an internal rebar skeleton for a concrete wall prior to pouring uses spaced apart vertical frame members having horizontal structures onto which horizontally oriented rebar can be laid and modular rebar retainers for positioning vertically oriented rebar in relation to the horizontally oriented rebar. The frame members may also include retention structures allowing for the insertion of spaced-apart rows of insulated panels to form an internal cavity into which concrete may be poured. External cladding is affixed to an external flange or sheath on the frame members with a thickness that creates a desired air gap between the external cladding and insulated panels. Frame members may also be laid horizontally across the top of a vertical layer of panels to form a base for a successive layer of vertical frame members and panels.

Insulated hollow core concrete forming system provide a forming system which can integrate the advantages of the hollow core design into the Insulated concrete form (ICF) system. The Insulated hollow core form system includes one or more of a Modular formwork unit, composed and formed of insulative material, where the Modular formwork unit utilizes longitudinal void formers that crafts a forming cavity of a hollow core section in between two spaced parallel side panels. The forming cavity is disposed to receive concrete or other hardening materials to form an insulated hollow core wall or an insulated hollow core slab. The system also includes a furring strip assembly positioned between adjacent Modular formwork units to join them together.