Disclosed invention comprises innovations in the fabrication process and the associated design methodology for producing refined prestressed concrete elements/components. The innovations disclosed are fabrication using multiple stages, the use of ultra high strength materials for only critical subcomponents, utilizing thinner sections made of ultra high strength materials, and a unique method of inducing and controlling camber. The embodiments of this invention enable the accelerated construction of concrete structures that are both durable and cost effective. This disclosure demonstrates the significant improvements to the prior art in the areas of durability, constructability, and cost reduction for prestressed concrete components. The embodiments presented in this disclosure are for bridge superstructure applications.

Vented floor structures are described herein. In some embodiments, precast vented floor structures (which can also be referred to as “air floors”) can be used in crop storage facilities, such as potato, onion, and/or other crop storage facilities. Embodiments of the vented floor structures described herein can be manufactured using a form to create air vents in the floor structure that do not require plastic shells or other ancillary structures to define or create the vent openings. Embodiments also include inserts that can be installed (e.g., removably installed) in vent openings to vary the opening size and/or configuration, or complete plug selected vent openings.

Disclosed invention comprises innovations in the fabrication process and the associated design methodology for producing refined prestressed concrete elements/components. The innovations disclosed are fabrication using multiple stages, the use of ultra high strength materials for only critical subcomponents, utilizing thinner sections made of ultra high strength materials, and a unique method of inducing and controlling camber. The embodiments of this invention enable the accelerated construction of concrete structures that are both durable and cost effective. This disclosure demonstrates the significant improvements to the prior art in the areas of durability, constructability, and cost reduction for prestressed concrete components. The embodiments presented in this disclosure are for bridge superstructure applications.

A concrete structure body includes a first concrete member having a first facing surface; a second concrete member having a second facing surface and disposed such that the first facing surface and the second facing surface face each other; a connection portion that fills a gap between the first facing surface and the second facing surface; and a tendon disposed in the connection portion to extend along the first facing surface and the second facing surface and to which a tensile force is applied in a longitudinal direction.

Demountable Floor Construction A floor plank (10) for use in a flooring system comprises a reinforced, inverted U-shaped, precast concrete element having an upper surface and depending ribs (14) along its longitudinal edges. The planks are supported on spaced horizontal beams (6) during assembly. The planks are interconnected by means of connector plates (52, 54, 56, 58) and bolts (50) along their edges to create a floor diaphragm and surface appropriate for use.

Demountable Floor Construction A floor plank (10) for use in a flooring system comprises a reinforced, inverted U-shaped, precast concrete element having an upper surface and depending ribs (14) along its longitudinal edges. The planks are supported on spaced horizontal beams (6) during assembly. The planks are interconnected by means of connector plates (52, 54, 56, 58) and bolts (50) along their edges to create a floor diaphragm and surface appropriate for use.

An apparatus, system, and method is provided to connect precast concrete panels to a structural member. The connector can have a receiving member embedded in a precast concrete panel and can further have an attachment member that selectively interconnects to the receiving member. This attachment member can have a surface that is oriented substantially perpendicular to the precast concrete panel and that receives or supports a structural member such as a floor joist or a second precast concrete panel. The configuration of a protrusion of the attachment member allows for a rapid and secure interconnection with an aperture in the receiving member. A builder can use the connector system described herein to rapidly and securely assemble multiple precast concrete panels to structural members in the construction of, for example, a parking garage or other similar structure.

An RC lattice beam is provided that can greatly dampen the transfer of vibrations in particular. As the concrete included in the RC lattice beam is polymer concrete that contains a polymer, fine-scale vibrations that may otherwise affect exposure apparatuses may be effectively dampened, while the depth of the conventional lattice beam may be kept the same. Thus, a high-damping RC lattice beam is provided that is capable of maximizing the performance of a precision exposure apparatus by reducing the defect rate and improving productivity.

An RC lattice beam is provided that can greatly dampen the transfer of vibrations in particular. As the concrete included in the RC lattice beam is polymer concrete that contains a polymer, fine-scale vibrations that may otherwise affect exposure apparatuses may be effectively dampened, while the depth of the conventional lattice beam may be kept the same. Thus, a high-damping RC lattice beam is provided that is capable of maximizing the performance of a precision exposure apparatus by reducing the defect rate and improving productivity.

A concrete structure body includes a first concrete member having a first facing surface; a second concrete member having a second facing surface and disposed such that the first facing surface and the second facing surface face each other; a connection portion that fills a gap between the first facing surface and the second facing surface; and a tendon disposed in the connection portion to extend along the first facing surface and the second facing surface and to which a tensile force is applied in a longitudinal direction.