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.

Precast concrete column (1) for the support of structural modular floor, preferably dry assembled, comprising in its upper part a capital for the support (2) of beams (3), having the support capital (2) a square or quadrangular plan in such a way that four sides (21, 22, 23, 24) are defined for the support of the beams (3), in which each of the sides (21, 22, 23, 24) comprises concave recesses (4) of sides parallel to the axis of the beams (3) that define convex protrusions (5) which sides comprise bearing surfaces (6) such that when laying a beam (3), which ends are complementary to said recesses (4), the bearing forces have directions contained in a plane (41, 42, 43, 44) perpendicular to the axis of the beam (3), having said directions a horizontal component. The invention also refers to a beam complementary to this column and to slab segments, as well as to a structure provided with said columns, said beams and optionally also said slab segments.

Precast concrete column (1) for the support of structural modular floor, preferably dry assembled, comprising in its upper part a capital for the support (2) of beams (3), having the support capital (2) a square or quadrangular plan in such a way that four sides (21, 22, 23, 24) are defined for the support of the beams (3), in which each of the sides (21, 22, 23, 24) comprises concave recesses (4) of sides parallel to the axis of the beams (3) that define convex protrusions (5) which sides comprise bearing surfaces (6) such that when laying a beam (3), which ends are complementary to said recesses (4), the bearing forces have directions contained in a plane (41, 42, 43, 44) perpendicular to the axis of the beam (3), having said directions a horizontal component. The invention also refers to a beam complementary to this column and to slab segments, as well as to a structure provided with said columns, said beams and optionally also said slab segments.

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 method of constructing a reinforced concrete floor structure or wall structure, including: fabricating a precast panel substantially from concrete including a first set of parallel conduits extending through the panel, wherein the conduits open to opposite sides of the panel; moving the panel into its final position on a building site; and inserting tensioning cables through the conduits and tensioning the precast panel in the direction of the conduits to form a reinforced floor structure or wall structure, and a dowel connecting system for joining adjacent precast building panels, the system comprising elongated hollow dowel members cast in at the edges of two or more precast building panels such that when the building panels are positioned adjacent to each other their respective dowel members are co-linearly aligned; and a dowel piece to be inserted into a recess of the co-linearly aligned dowel members and to extend across the building panels, wherein the recess of the dowel members is adapted to be filled with grout to anchor the dowel piece therein and thereby structurally joining adjacent building panels.

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.

A beam used for construction, particularly of short- to mid-span bridges. A beam can include flanges extending from a web that are joined to flanges of another beam. When joined two beams form an open internal void. The beams can be manufactured from concrete and include an embedded reinforcement cage. Manufacture of the beams utilizes a formwork that can be filled in a single pour.

A beam used for construction, particularly of short- to mid-span bridges. A beam can include flanges extending from a web that are joined to flanges of another beam. When joined two beams form an open internal void. The beams can be manufactured from concrete and include an embedded reinforcement cage. Manufacture of the beams utilizes a formwork that can be filled in a single pour.

A precast concrete beam including a substantially planar web extending longitudinally between ends of the beam; a pair of flanges formed integrally with the web, each flange extending laterally from an elongate edge of the web and extending longitudinally between the ends of the beam so as to define a structure engaging surface of the beam; and a plurality of diaphragms formed integrally with the web and the flanges, each diaphragm spanning laterally between a side of the web and one of the flanges, wherein the diaphragms are spaced apart along the beam to thereby support the flanges.

A precast concrete beam including a substantially planar web extending longitudinally between ends of the beam; a pair of flanges formed integrally with the web, each flange extending laterally from an elongate edge of the web and extending longitudinally between the ends of the beam so as to define a structure engaging surface of the beam; and a plurality of diaphragms formed integrally with the web and the flanges, each diaphragm spanning laterally between a side of the web and one of the flanges, wherein the diaphragms are spaced apart along the beam to thereby support the flanges.