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.

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.

A coupling apparatus presses conical members having curved surfaces in a direction perpendicular to reinforcing bars by using hydraulic pressure, thereby considerably reducing working time for coupling reinforcing bars, completely securing the reinforcing bars and increasing compressive and bending strength. It is possible to stably carry force from the conical members through external force dispersion medium members to reinforcing bar securing members. Accordingly, there is a structural advantage of effectively preventing the displacement and the loosening of the coupled reinforcing bars.

A number of apparatuses and methods for fastening roofing straps and structural members to roofs are disclosed.

An embodiment is directed to a duct coupler for joining two segments of conduit. The duct coupler includes a coupler body. The coupler body is generally tubular and has an inner diameter generally corresponding to the outer diameter of a section of conduit measured at an annular locking rib positioned on the section of conduit. The duct coupler further includes one or more protrusions formed on the interior surface of the coupler body. Each protrusion is generally wedge shaped. The one or more protrusions are positioned to engage with at least one annular locking rib to retain the section of conduit within the coupler body. The duct coupler further includes a body gasket. The body gasket is generally tubular and positioned on the interior surface of the coupler body. The body gasket is positioned to form a seal between the inner wall of the coupler body and the outer wall of the section of conduit.

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.

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.

Environmentally friendly concrete compositions and methods thereof are disclosed. For example, a method for producing an environmentally friendly concrete installation can include mixing cement, one or more locally sourced pozzolans, and one or more locally sourced aggregates to produce a dry concrete mixture. At least one fine aggregate or coarse aggregate of the dry concrete mixture is a locally sourced aggregate of the one-or-more locally sourced aggregates for a reduced carbon footprint. The method can include hydrating the dry concrete mixture with water to make a pourable concrete mixture. The method can include pouring the pourable concrete mixture into a formwork to produce a poured concrete form. The method can include allowing the poured concrete form to cure to produce the concrete installation. The reduced carbon footprint of the concrete installation is relative to that of a similar concrete installation produced without the one-or-more locally sourced pozzolans or aggregates.

Methods and apparatus for improving accuracy in installing and verifying post-tensioning cables are described herein. In an embodiment, a computing system receives a computer-aided design drawing of a structure with post-tensioning cables and uses the computer-aided design drawing to populate a base spreadsheet with data extracted from the drawing. The computing system then determines a plurality of locations on a particular post-tensioning cable to place labels, causes display of an indication of the plurality of locations, and causes printing of the labels. When a scan of a label is received, the computing system retrieves the extracted data, requests input relating to the label, and compares the input to the extracted data. Any discrepancies are then displayed through a display device.

Methods and apparatus for improving accuracy in installing and verifying post-tensioning cables are described herein. In an embodiment, a computing system receives a computer-aided design drawing of a structure with post-tensioning cables and uses the computer-aided design drawing to populate a base spreadsheet with data extracted from the drawing. The computing system then determines a plurality of locations on a particular post-tensioning cable to place labels, causes display of an indication of the plurality of locations, and causes printing of the labels. When a scan of a label is received, the computing system retrieves the extracted data, requests input relating to the label, and compares the input to the extracted data. Any discrepancies are then displayed through a display device.