A method for re-tensioning a stressed tendon cast in a reinforced concrete structure includes removing concrete from the structure to expose the tendon. A pocket former is attached to the exposed tendon. The pocket former comprises two partial sections assembled to enclose the tendon. Grout is poured around the pocket former and is allowed to substantially cure. The pocket former is removed and the tendon is cut. An anchor is assembled to the tendon and the tendon is stressed.

A split nut can include a first nut portion and a second nut portion. The first nut portion can define a first receptacle and a second receptacle. The second nut portion can define a first passage and a second passage, and the first and second passages can be respectively located to align with the first and second receptacles. A first pin and a second pin can respectively extend through the first and second passages to respectively engage with the first and second receptacles, for instance to secure the first and second nut portions together to close the split nut and thereby define a nut passage.

An apparatus or system for reinforcement bar (rebar) joint recognition using artificial intelligence vision includes a rebar tying tool attached to a micro manipulator; and a macro manipulator for moving the position of the micro manipulator; wherein the macro manipulator is adapted to move the micro manipulator on a first plane; the micro manipulator is adapted to move the rebar tying tool on a second plane parallel to the first plane and at a first axis vertical to the second plane.

A slab bolster element includes a frame member having a male connector at a first end and a female connector at an opposite second end. The male connector includes a substantially solid insertion body with a surface having a transverse locking groove. The female connector includes a receptacle body configured to receive the insertion body of a complementary male connector, and a resiliently flexible locking tab positioned and configured to resiliently deflect to allow the insertion of the insertion body of another slab bolster element into the receptacle body, and to resiliently engage with the transverse locking groove of the insertion body when the insertion body is received within the receptacle body.

A rebar holster system includes a vertical holster having an upper portion, a lower portion, and a middle portion. The upper portion includes an opening, the opening of the upper portion having a greater diameter than the vertical reinforcing bar such that the upper portion is dimensioned and configured for loosely receiving a leading end of the vertical reinforcing bar. The lower portion includes a securing means for securing the leading end of the vertical reinforcing bar to the vertical holster. The middle portion is disposed between the upper portion and the lower portion for guiding the leading end of the vertical reinforcing bar from the opening of the upper portion to the securing means of the lower portion.

A bracket for locating a vertical reinforcement bar within a block wall having a central area to enable a reinforcement bar placed vertically through a void of a block wall to pass through the bracket; and a locator for locating the central area in a predetermined position within the void of a block wall; wherein one or more guides extend into the central area to guide one or more reinforcement bars through a central aperture, the central aperture defined by the one or more guides.

The present application relates to the technical field of engineering construction and provides a rebar, a device and a construction method for 3D-printing a concrete interlayer structure. The rebar at least comprises: a body in the form of a chain structure, comprising a plurality of sub-parts mutually spliced, wherein the body is adapted for being sandwiched between two adjacent upper and lower cement-based slurry layers; a rotatable joint arranged between two adjacent sub-parts in such a way that the two adjacent sub-parts are rotatably connected to each other; insertion members, wherein both sides of each of the sub-parts are provided with the insertion members extending away from the center of each of the sub-parts, wherein the insertion member on one side of each of the sub-parts is adapted for being inserted in an upper cement-based slurry layer, and the insertion member on an opposite side of each of the sub-parts is adapted for being inserted in a lower cement-based slurry layer. In summary, the rebar can simultaneously enhance the bearing capacity of the printed structure both in the horizontal direction and in the vertical direction, improve the overall connection strength of the printed structure, so that the building structure is not prone to damage or collapse, which is conducive to reducing any potential safety hazard.

The invention relates to a system for connecting textile-reinforced structural modules along a connecting edge (76) having an edge groove (74) comprising yarn loops (4). According to the invention, the system comprises a wedge element (410) and two shell elements (420) having a keyway (422) and is provided for insertion into the two edge grooves (74) having overlapping yarn loops (4), wherein further the wedge element (410) is provided for partial extraction from the two oppositely arranged keyways (422) so that the shell elements (420) can be spread away from each other by wedge action and the yarn loops (4) can be pulled together. The invention further relates to an apparatus and a method for producing a textile reinforcement (10) comprising a yarn (2) arranged within a base frame (100) or for producing a textile-reinforced structural module (72) comprising the textile reinforcement (10) and a curable material, wherein a freely formable shaping device (200) is provided on which the structural module is formed. According to the invention, the textile reinforcement (10) can be formed between yarn holding devices (130, 180) arrangeable on bendable frame strips (110). The invention also relates to a concrete component comprising connected concrete structural modules and a printer description file, and a yarn deposition file.

A pocket former may include a pocket former body, the pocket former body having an outer surface. The pocket former may further include a collapsible element, the collapsible element formed on the outer surface of the pocket former body. The collapsible element may extend radially outwardly from the pocket former body.

A disclosed rebar coupler includes a first coupling member, a second coupling member, and a coupling means. Accordingly, the connection angle between the first coupling member and the second coupling member is variable to a desired angle. The connection angle between rebars to be connected may be rapidly and conveniently varied at an industrial site to which the rebars are applied.