A multiple hydraulic robot system for precisely installing a girder according to the present disclosure may comprise: four hydraulic robots connected to both sides of two connection plates which are coupled to both ends of the top surface of a girder installed between bridge piers and to which cables of a crane are connected, wherein the robots move the girder horizontally and vertically; a hydraulic system for operating actuators of the four hydraulic robots; and a controller which controls the remotely operated four hydraulic robots by means of a synchronization control algorithm to precisely adjust the installing position of the girder.

The present disclosure provides an assembly type bridge lower structure having a socket type elastic duct coupler and a method of constructing the same in which, in construction of an assembly type bridge lower structure that consists of an assembly type foundation part, an assembly type pillar part, and an assembly type coping part, a socket type elastic duct coupler is utilized, thus enabling shear key joining at connection portions of the assembly type foundation part, the assembly type pillar part, and the assembly type coping part, easily accommodating of construction error displacements of the socket type elastic duct coupler, improving watertightness at connection portions of the precast segments, easily accommodating an insertion angle of the insertion member including a steel strand, a steel bar, a reinforcing bar, a FRP, or the like, and preventing an overflow phenomenon that occurs when epoxy is excessively applied during bonding between the precast segments.

The present disclosure provides an assembly type bridge lower structure having a socket type elastic duct coupler and a method of constructing the same in which, in construction of an assembly type bridge lower structure that consists of an assembly type foundation part, an assembly type pillar part, and an assembly type coping part, a socket type elastic duct coupler is utilized, thus enabling shear key joining at connection portions of the assembly type foundation part, the assembly type pillar part, and the assembly type coping part, easily accommodating of construction error displacements of the socket type elastic duct coupler, improving watertightness at connection portions of the precast segments, easily accommodating an insertion angle of the insertion member including a steel strand, a steel bar, a reinforcing bar, a FRP, or the like, and preventing an overflow phenomenon that occurs when epoxy is excessively applied during bonding between the precast segments.

A cable anchorage is described for anchoring a cable, for example a stay cable comprising multiple strands (50), against an axial tension force. Each strand (50) is individually sealed in an individual channel (6) of the anchorage against moisture ingress, and each strand (50) may be removed and replaced individually. A tight-fitting elastic annular seal (26) is fitted into a recess (27) in the channel. The annular seal (26) is inserted from the anchor block end (1) of the anchorage.

A cable anchorage is described for anchoring a cable, for example a stay cable comprising multiple strands (50), against an axial tension force. Each strand (50) is individually sealed in an individual channel (6) of the anchorage against moisture ingress, and each strand (50) may be removed and replaced individually. A tight-fitting elastic annular seal (26) is fitted into a recess (27) in the channel. The annular seal (26) is inserted from the anchor block end (1) of the anchorage.

A precast concrete bridge and headwall assembly includes a precast concrete bridge unit including a top wall connecting opposite side walls, and a precast concrete headwall having a bottom surface engaged on the top wall of the bridge unit and a series of earth anchors at laterally spaced intervals between the side walls. The earth anchors include a body member extending outward from the headwall to the top wall, and a foot member extending laterally outward from the body member engaged on the top wall and including an upper surface generally parallel to the top wall.

A precast concrete bridge and headwall assembly includes a precast concrete bridge unit including a top wall connecting opposite side walls, and a precast concrete headwall having a bottom surface engaged on the top wall of the bridge unit and a series of earth anchors at laterally spaced intervals between the side walls. The earth anchors include a body member extending outward from the headwall to the top wall, and a foot member extending laterally outward from the body member engaged on the top wall and including an upper surface generally parallel to the top wall.

A bridge or other construction comprising a deck, in which the deck is designed to be lightweight and durable, such as by including aluminum, and readily installable on a main bearing structure of the bridge or other construction (e.g., without welding and/or without drilling or otherwise creating holes into the main bearing structure of the bridge or other construction), even if the main bearing structure of the bridge or other construction is based on different material (e.g., steel).

A bridge or other construction comprising a deck, in which the deck is designed to be lightweight and durable, such as by including aluminum, and readily installable on a main bearing structure of the bridge or other construction (e.g., without welding and/or without drilling or otherwise creating holes into the main bearing structure of the bridge or other construction), even if the main bearing structure of the bridge or other construction is based on different material (e.g., steel).

A new modular orthotropic steel bridge deck, and its manufacturing method, which introduces the design standardization of the orthotropic steel bridge deck designs, thereby, leading to cost-effective solutions by avoiding the complexities and costly details that are unnecessary for orthotropic steel bridge deck and short span bridge applications.