A rebar tying tool (2; 302; 402) include a feed mechanism (24), which includes a first motor (32; 304) and feeds a wire (W), and a twisting mechanism, which includes a second motor (76; 306) and twists together one or more portions of the wire. A control unit (202; 350) controls the first motor and the second motor and includes a general-purpose I/O port (202c; 350c) and a motor-control-signal output port (202a; 350a). A motor-control-signal-output-destination-switching circuit (204; 310; 406) inputs motor-control signals (UH, VH, WH, UL, VL, WL) from the control unit via the motor-control-signal output port and selectively outputs the inputted motor-control signals to either the first motor or the second motor in response to input of a switching signal (SW).

An attachment device attaches adjacent first and second concrete pieces to one another along corresponding first and second interfacing side surfaces thereof, thereby forming a concrete piece attachment arrangement. The device includes an elongate base member having opposed first and second portions, and first and second lateral members securing to and respectively extending substantially perpendicularly from first and second ends of the base member. The first and second portions of the base member extend within first and second recesses respectively formed into the concrete pieces, in a direction generally perpendicular to the first and second interfacing side surfaces. The first and second lateral member respectively extend through bore holes extending through the first and second concrete pieces and connecting with the respective first and second recesses. A method for attaching the concrete pieces to one another with an attachment piece is also described.

A tool for manufacturing of a reinforcement bar structure, wherein the tool comprises a main body, a jaw arrangement, a tying device and an arrangement configured for moving the jaw arrangement between a gripping state and a tying state. A system for manufacturing a reinforcement bar structure, wherein the system comprises a supply of reinforcement bar material, a bending apparatus, a holding apparatus and a group of robots wherein at least one robot of the group of robots is equipped with the tool for manufacturing a reinforcement bar structure. A method for transporting and attaching a reinforcement bar during manufacturing of a reinforcement bar structure using a tool comprising a main body, the method comprising gripping a reinforcement bar, tying together the reinforcement bar with another reinforcement bar by looping a wire around the reinforcement bars, tightening the wire around the reinforcement bars, forming a knot, and cutting the wire.

Provided is an anchor assembly having a pre-stressed mandrel, which consists of an inner pre-stressed concrete mandrel and an outer cast-in-place anchoring slurry, wherein pre-stressed tendons are arranged inside the concrete mandrel and are prefabricated by a pretensioning method; the anchoring slurry wraps the pre-stressed concrete mandrel, and the cast-in-place anchoring slurry is formed by placing the pre-stressed concrete mandrel in a pile hole, and solidifying after primary grouting or secondary grouting. According to the anchor assembly, the pre-stress is not required to be tensioned and locked on site, so that the quality of the pre-stressed mandrel can be ensured, the on-site construction period can be greatly shortened, and the existing pre-stressed and common non-pre-stressed anchors can be replaced.

A rebar tying tool includes: a feed mechanism (24), which includes a first brushless motor (32) and performs an advancing process that advances a wire (W) and a draw-back process that draws back the wire (W); a first inverter circuit (212), which is electrically connected to the first brushless motor; and a control unit (202), which controls the first brushless motor via the first inverter circuit. The first brushless motor comprises a first Hall-effect sensor (180), which is disposed on a first sensor board (178). In the advancing process, the control unit performs lead-angle control on the first brushless motor at a first lead angle. In the draw-back process, the control unit performs lead-angle control on the first brushless motor at a second lead angle. The first lead angle is set to be larger than the second lead angle.

The invention relates to a method for manufacturing a reinforced concrete component (1, 1′), in particular a generatively produced reinforced concrete component (1, 1′), a reinforced concrete component and a manufacturing system for manufacturing a reinforced concrete component. In particular, the invention relates to a method for manufacturing a reinforced concrete component (1, 1′), comprising: creating a first concrete layer (20) and a second concrete layer (22) with a generative method, preferably with a shotcrete method, arranging a positioning element (100, 102, 104, 110, 120, 122, 124, 126, 128, 130) for fixing a reinforcement unit (200), wherein the positioning element is arranged with a supporting section (106) between the first concrete layer (20) and the second concrete layer (22) and protrudes with a fastening section (108) from the first concrete layer and from the second concrete layer (22), arranging at least one reinforcement unit (200) for reinforcing the concrete component (1, 1′) on the positioning element.

A system, method, and apparatus for post-tensioning in masonry-based system, especially concrete support systems. In one embodiment, a system is presented that can include an anchor, pocket-former, and bolt, wherein the pocket-former can be configured to engage each of the anchor and bolt to facilitate securing of the system to a form. In another embodiment, a method of post-tensioning is presented, wherein a tendon can be suspended at the live end via connections facilitated by a pocket-former. In another embodiment, a system and method of post-tensioning is presented that prevents a pocket and anchor from being contaminated with debris that could ultimately compromise the integrity of the tensioned material.

A system for use with a post-tensioning concrete anchor may comprise a connector anchor including a bore therethrough, the bore including a first frustoconical portion, the connector anchor adapted to bear on the post-tensioning concrete anchor, and a coupler. The coupler may comprise a coupler body including a bore therethrough, the bore including a second frustoconical portion that is oriented oppositely to the first frustoconical portion, and a connector having a bore therethrough and configured to receive the coupler body therein, the connector adapted to mechanically engage the connector anchor such that a tensioning force can be transmitted from the coupler body to the connector anchor via the connector. A method of using the system may allow a second concrete section to be poured adjacent to a first concrete section before the first concrete section has been stressed.

A system for use with a post-tensioning concrete anchor may comprise a connector anchor including a bore therethrough, the bore including a first frustoconical portion, the connector anchor adapted to bear on the post-tensioning concrete anchor, and a coupler. The coupler may comprise a coupler body including a bore therethrough, the bore including a second frustoconical portion that is oriented oppositely to the first frustoconical portion, and a connector having a bore therethrough and configured to receive the coupler body therein, the connector adapted to mechanically engage the connector anchor such that a tensioning force can be transmitted from the coupler body to the connector anchor via the connector. A method of using the system may allow a second concrete section to be poured adjacent to a first concrete section before the first concrete section has been stressed.

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.