A system for a strand-to-threadbar coupler block for prestressed concrete is disclosed. A system includes a concrete member, one or more multi-wire strands disposed within the concrete member, and a strand-to-threadbar coupler block disposed within the concrete member. The strand-to-threadbar coupler block is formed with a threadbar opening to admit a threadbar, and with one or more strand openings. The system includes one or more strand chucks coupled to the strand-to-threadbar coupler block at the one or more strand openings. A chuck diameter for the one or more strand chucks is greater than a diameter for the one or more strand openings, and the one or more multi-wire strands extend through the one or more strand openings and engage the one or more strand chucks.

An angled coupling to receive multiple pieces of threaded rod in order to adjust the location of the threaded rod, that can also be used for seismic restraints and/or storm surge restraints. The angled coupling includes a first internally threaded coupler and a second internally threaded coupler connected to the first coupler and extending from the first coupler at a defined angle from an axis thereof. The angled coupling may include additional couplings extending from the first coupler at the defined angle that may be spaced apart around the axis of the first coupling. The first coupler may be a passthrough coupler to either have a threaded rod pass therethrough or to receive a first threaded rod in a first side and a second threaded rod in a second side. The angled coupling is made of a high strength material (e.g., steel, cast iron, composites, high strength plastics, combinations thereof).

Precast construction elements are described suitable for use in high seismic areas. The precast construction elements can be precast, pre-topped double tees. The precast construction elements incorporate a passive energy dissipation device in a flange. The energy dissipation device provides a ductile connection having a deformation capacity of larger than 0.6″. Adjacent elements are connected to one another at joints that include the passive energy dissipation device. Passive energy dissipation devices can be passive hysteretic dampeners, such as U-shaped flexural plates. Passive energy dissipation devices can be bar dissipaters (e.g., grooved dissipaters). Also described are passive hysteretic dampers that include U-shaped flexural plates held in conjunction with a reinforcement element that defines a circle around which the flexural plate can bend.

A system includes a form panel positioning apparatus for positioning an elevated form panel of a concrete form. The apparatus may include at least one positioning subassembly providing positioning of the form panel in at least one direction, and may include a first positioning subassembly with a first clip to clip onto an element of a concrete reinforcement structure, a first support rod engageable with the first clip, and a first positioning plate positionable on the rod adjacent to the form panel to support the form panel on the rod. The system may include a second positioning subassembly for positioning the form panel such that the form panel is supported in two directions, such as substantially vertical and substantially horizontal directions.

A rebar anchoring system and method are provided. The system includes: a rebar, with an external thread formed on the periphery of at least one end; an anchoring head, with a first perforation and a second perforation disposed respectively at both ends extending axially into the anchoring head and communicating with each other, the inner sides of the first and second perforations being formed respectively with a first internal thread matching with the external thread of the rebar and a second internal thread, and the anchoring head being mounted on the end of the rebar through the first internal thread and the external thread of the rebar; and a bolt, having a screw rod matching with the second internal thread, the screw rod being locked into the second perforation of the anchoring head, and the end of the screw rod pressing against the end of the rebar.

A multi-piece pre-assembled raft foundation is provided and includes pre-assemble bottom layer rebars of foundation slab, foundation steel columns, upper layer rebars of the foundation slab, and foundation rebars. The pre-assembled raft foundation is transported to a construction site for final assembly. A construction method of the multi-piece pre-assembled raft foundation is also provided.

The present invention relates to a novel form of self-locking mechanical rebar coupler which is able to easily couple neighboring rebars by way of an inserting plug welded to one side of the rebar, which penetrates a receiving socket which is welded to another piece of rebar. It is then locked into place by a spring-loaded dowel which penetrates the inserting plug when the inserting plug pushes down a cap at the bottom of the receiving socket which had been holding the spring-loaded dowel in place. The purpose of this coupler is to transfer a load against tensile force and compression force in a stable manner by coupling two separate pieces of rebar and locking them into place. Various diameters of rebar can be used in this self-locking mechanical rebar coupler. The assembly by providing a self-locking rebar coupling, is aimed to reduce the size of rebar components which can be combined together on a construction site and improve construction speed.

The present invention relates to a sleeve for connecting a steel bar, wherein a body prevents generation of tolerance at the circumferential surface of at least one of an upper steel bar and a lower steel bar through a tolerance generation preventing unit, the body allowing the upper steel bar to be inserted from one side thereof in an axial direction and the lower steel bar to be inserted from the other side thereof in the axial direction.

Fiber reinforced plastic (FRP) sheet or jacket systems and methods are provided as an alternative splicing method to connect driven pile segments or other structural members. These systems are applicable to both unforeseen and preplanned splicing situations and can be used in the unforeseen condition when other splice systems may fail to provide the required capacity.

A reinforcing bar joint includes: cylindrical bodies each including an inner surface including a female thread part; joint members each including one end portion including a joint male thread part; and a connecting member configured to connect a pair of the joint members which face each other, such that the pair of the joint members are allowed to move in the longitudinal direction and in an orthogonal direction to the longitudinal direction. Each of the cylindrical bodies includes one end portion configured to threadedly engage with a reinforcing bar male thread part at an end portion of one of reinforcing bars, and the other end portion configured to threadedly engage with the joint male thread part at the one end portion of a corresponding one of the joint members.