Abstract: A rebar splice joint embedded in a reinforced concrete structure and having improved seismic resistance is made between a first rebar with an internal thread and a second rebar element having a male thread between a stop shoulder and the end of the rebar. The bar length between the stop shoulder and the male threaded bar end is shorter than the length of the internal thread. The male thread is turned into the internal thread and the first rebar is torqued against the stop shoulder to near the elastic limit of the bars to elastically deform the male and female threads into more uniform contact along their opposing thread surfaces thereby increasing contact area between the threads to reduce or eliminate relative axial movement between the rebars under cyclic axial loading, such as seismic loading.

Abstract: Disclosed is a combination hybrid splice sleeve which has a threaded end for making a mechanical joint with a male thread on a rebar end, and an opposite end open for receiving a second rebar, which need not be threaded, for making a grout joint between the sleeve and the second rebar. This sleeve has a tapering cross section between a wide end and a narrow end, with internal radial ridges of constant height spaced between the two opposite ends. A threaded cylindrical bore is axially aligned in the wide end for screwing to a first rebar. The narrow end is open for receiving a second rebar. Two grout ports open radially into the sleeve. The first grout port is near to the narrow end, and the second grout port is proximal to the threaded bore. The second grout port is of smaller aperture than the first grout port, for partially restricting out flow of grout injected through the first grout port, to encourage filling of the sleeve by building up some back pressure.

Abstract: A fastener system for temporarily securing a reinforcing beam or the like to a poured concrete structural member includes an anchor to be set in poured concrete with an exposed handle portion free of said concrete, and a shaft with a slotted end for receiving the handle portion. A spring loaded pin in the slot retains the handle portion in interlocking engagement with the shaft. An opposite end of the shaft secures a strongback beam to the concrete structure.