The present invention relates to a concrete structure for constructing a building floor and a building floor construction structure including the same. The present invention provides a concrete structure for constructing a building floor which forms a building floor foundation, including: a concrete main body to store fire-extinguishing water for fire suppression; and a fire-extinguishing water injection unit to inject the fire-extinguishing water stored in the concrete main body, and a building floor construction structure including the same. According to the present invention, the concrete structure for forming a building floor stores fire-extinguishing water, and thus early fire suppression is possible, building floor construction is facilitated, and excellent inter-floor sound insulation properties are provided.

Threaded rebar with substantially continuous threads formed using a rolling process, wherein a majority of the circumference of the threaded rebar is covered by discontinuous threads, and wherein no additional steps are required to remove longitudinal ribs in the threaded rebar. The threaded rebar may be used to form threaded rebar hoops that utilize one or more threaded rebar sections and one or more couplings to mechanically couple the ends of the various threaded rebar sections. In such threaded rebar hoops, the external threads are able to engage a coupling, which has internal threads that engage the external threads on the threaded rebar. The mechanically coupled threaded rebar hoops are an improvement over the welded rebar hoops because the mechanically coupled threaded rebar hoops are easier and cheaper to manufacture, ship, and/or install on site, and/or may provide improved strength and/or manufacturability when compared to welded rebar hoops.

An erection system for one or more elongated elements, such as structural columns, pre-fabricated reinforcing cages or tower-like structures includes one or more longitudinal lifting bars running parallel with the elongated element's longitudinal direction. The lifting bars are installed within or onto the elongated element through apertures in the element's upper and lower support pieces. A rigging system supports the upper portion of the lifting bar. The lifting bar's lower portion includes external threading to receive an internally threaded load bearing nut. The load bearing nut supports the elongated element's weight onto the lifting bar's lower portion. The upper and lower support pieces stabilize the elongated element with lateral restraint. Removing the load bearing nut and raising the lifting bar up through the support piece's apertures extracts the lifting bar from the elongated element. Adjustable spreader bars separate multiple lifting bars to minimize lateral and bending stresses in the lifting bar.

A stirrup module includes an outer stirrup set, an upper-opening stirrup set having an upper opening and provided in an opening of the outer stirrup of the outer stirrup set, and a lower-opening stirrup set having a lower opening and provided in the opening of the outer stirrup of the outer stirrup set. Wherein the upper opening and the opening of the outer stirrup are oriented in the same direction, the lower opening and the upper opening are in opposite directions to each other. Wherein the upper-opening stirrup set has a first bottom of stirrup opposite to the upper opening, and the first bottom of stirrup corresponds to the position of the lower opening; the lower-opening stirrup set has a second bottom rib opposite to the lower opening, and the second bottom rib corresponds to the position of the upper opening.

Method for installing a hollow concrete tower comprising the following steps: a) arranging a platform on a site; b) arranging on said platform at least one partial full-segment mould in a position such that the segment axis of the segment being cast in said mould is substantially vertical; c) pouring concrete inside said arranged partial mould(s); d) allowing the poured concrete to set to working strength, generating corresponding segment(s); e) removing the arranged mould(s) with concrete set to working strength, to leave the corresponding segment(s) exposed; f) assembling said corresponding exposed segment(s); and g) optionally, repeating steps b)-f) at least once.

A rebar structure includes a plurality of column longitudinal bars to be connected to a beam. The yield point or the 0.2% proof stress of at least a portion the column longitudinal bars is larger than the yield point or the 0.2% proof stress of a normal reinforcing bar defined by JIS G 3112.

Systems and methods for producing dowel baskets from dowel side frames and transverse dowel rods. The dowel side frames are introduced at a top location of the production system, where there is initially introduced a first dowel rod and subsequently, with successive stepwise advancements, the remaining dowel rods are introduced. The dowel side frames with the dowel rods advance on guides that may rotate the dowel side frames relative to the axes of the longitudinal wires so as to impart a desired inclination angle relative to the rods. In following, with continuous stepwise advancements, the dowel rods are alternately welded, each to one of the opposed dowel side frames. Transverse wires are welded on the longitudinal wires to impart rigidity to the dowel basket. Subsequently, mass-produced dowel baskets may be stacked in groups.

A stirrup module includes a bottom rib and a first erect bar, a second erect bar, a third erect bar and a fourth erect bar that are arranged in parallel to each other. The third erect bar is located between the first erect bar and the second erect bar. The fourth erect bar is located between the third erect bar portion and the second erect bar portion. A first gap is between the first erect bar and the third erect bar, and a second gap is between the second erect bar and the fourth erect bar. The bottom rib connects the bottom ends of the first erect bar, the second erect bar, the third erect bar and the fourth erect bar, and the first gap and the second gap are each formed with an opening at the end opposite to the bottom rib.

A rebar structure includes a plurality of column longitudinal bars to be connected to a beam. The yield point or the 0.2% proof stress of at least a portion the column longitudinal bars is larger than the yield point or the 0.2% proof stress of a normal reinforcing bar defined by JIS G 3112.

The present invention provides a rebar cage module comprising a first opening rebar net and a second opening rebar net. The first opening rebar net extends from a central direction, and partially forms an elongated groove shape enclosing a first accommodating portion, and has a first opening. The second opening rebar net extends from the central direction, and partially surrounds the central direction to form an elongated groove shape, and has a second opening oriented to the opposite direction with the first opening. Wherein, the first opening rebar net at least partially covers the second opening rebar net, the first opening rebar net is at least partially distributed in the second opening, and the first opening rebar net extends at least partially through the second opening into the second accommodating portion, and making the first accommodating portion and the second accommodating portion at least partially overlap.