A method for rapid and safe construction and intelligent monitoring and controlling of continuous arch bridges, which using a single-arch rib construction method, when installing a new arch rib segment, the clasp cable is immediately extended, and then using an intelligent control cable to ensure that the pier and anchorage tower are in a balanced state. The newly installed segment is no longer in a cantilever state, and the loading on the flange is very small, resulting in a small change in the tension force for the clasp cables of the previous segments. The present invention saves more than half of the clasp cable usage, reduces the number of transverse movements of the cable crane system, and significantly shortens the construction period. The construction method which using intelligent control cables to balance the unbalance loading on the middle pier, could be applied to the construction of continuous arch bridges.

The present disclosure belongs to the technical field of arch bridge structures, and particularly relates to a steel-concrete combined skewback structure and a construction method thereof. In the present disclosure, by arranging arch rib tubes, concrete sections in a main chord pipe, concrete blocks in a skewback, fixing steel tubes, a transverse diaphragm unit, and a vertical diaphragm unit, the steel-concrete combined skewback structure can achieve the following objectives that 1. the skewback structure can be fully connected with a bearing platform; and 2. the fixing steel tubes are fully filled with concrete. In addition, the present disclosure further provides the construction method of the above steel-concrete combined skewback structure. The construction method the skewback structure itself and its mounting manner both have sufficient structural stability.

The present disclosure belongs to the technical field of arch bridge structures, and particularly relates to a steel-concrete combined skewback structure and a construction method thereof. In the present disclosure, by arranging arch rib tubes, concrete sections in a main chord pipe, concrete blocks in a skewback, fixing steel tubes, a transverse diaphragm unit, and a vertical diaphragm unit, the steel-concrete combined skewback structure can achieve the following objectives that 1. the skewback structure can be fully connected with a bearing platform; and 2. the fixing steel tubes are fully filled with concrete. In addition, the present disclosure further provides the construction method of the above steel-concrete combined skewback structure. The construction method the skewback structure itself and its mounting manner both have sufficient structural stability.

An externally encased prefabricated ultra-high-performance concrete (UHPC) slab arch bridge with a concrete-filled steel tube stiff skeleton is provided. The arch bridge includes a concrete-filled steel tube stiff skeleton arch rib segment, where the concrete-filled steel tube stiff skeleton arch rib segment is arranged at four corners inside a concrete-filled steel tube stiff skeleton externally encased prefabricated UHPC slab arch rib segment, and the concrete-filled steel tube stiff skeleton externally encased prefabricated UHPC slab arch rib segment includes two web structures, where the top and bottom of the two web structures are respectively connected to a roof structure and a floor structure through a cast-in-situ UHPC longitudinal joint and a cast-in-situ UHPC transverse joint. The stiff skeleton externally encased concrete is prefabricated into a UHPC slab and then transported to the site for assembly, the UHPC is used as externally encased concrete to reduce the self-weight of the structure.

An externally encased prefabricated ultra-high-performance concrete (UHPC) slab arch bridge with a concrete-filled steel tube stiff skeleton is provided. The arch bridge includes a concrete-filled steel tube stiff skeleton arch rib segment, where the concrete-filled steel tube stiff skeleton arch rib segment is arranged at four corners inside a concrete-filled steel tube stiff skeleton externally encased prefabricated UHPC slab arch rib segment, and the concrete-filled steel tube stiff skeleton externally encased prefabricated UHPC slab arch rib segment includes two web structures, where the top and bottom of the two web structures are respectively connected to a roof structure and a floor structure through a cast-in-situ UHPC longitudinal joint and a cast-in-situ UHPC transverse joint. The stiff skeleton externally encased concrete is prefabricated into a UHPC slab and then transported to the site for assembly, the UHPC is used as externally encased concrete to reduce the self-weight of the structure.

A spatial multi-point synchronous closure construction method for a three-main-truss steel truss arch bridge. The method includes mounting standard rods, adjusting the standard rods to designed coordinates, observing coordinates and spacing of closure rods, processing and mounting the closure rods, adjusting spatial locations, monitoring the atmospheric temperature, analyzing a change rule, pushing the standard rods, adjusting gaps, and carrying out closure.

A spatial multi-point synchronous closure construction method for a three-main-truss steel truss arch bridge. The method includes mounting standard rods, adjusting the standard rods to designed coordinates, observing coordinates and spacing of closure rods, processing and mounting the closure rods, adjusting spatial locations, monitoring the atmospheric temperature, analyzing a change rule, pushing the standard rods, adjusting gaps, and carrying out closure.

The present disclosure provides a rear-anchored V-shaped pier of a steel structure of a three-legged star-shaped pedestrian landscape bridge and a construction method. The rear-anchored V-shaped pier of a steel structure of a three-legged star-shaped pedestrian landscape bridge is applied to a main bridge arch that includes three arch legs connected into a star shape having three legs, and includes a deck-type arch-footed V-shaped pier, where the deck-type arch-footed V-shaped pier is disposed at a rear end of each arch leg. The deck-type arch-footed V-shaped pier has a top connected to the arch leg and a bottom hinged with a pile foundation of a bearing platform pre-poured on a construction ground. A tie rod is connected between the rear end of the arch leg and the pile foundation of the bearing platform, and an anchor cable tensioning structure configured to tension the tie rod is disposed on the pile foundation of the bearing platform. The present disclosure meets requirements for mounting a large-span bridge arch on a soft soil foundation, and implements mounting effect of the large-span bridge arch.

The present disclosure provides a rear-anchored V-shaped pier of a steel structure of a three-legged star-shaped pedestrian landscape bridge and a construction method. The rear-anchored V-shaped pier of a steel structure of a three-legged star-shaped pedestrian landscape bridge is applied to a main bridge arch that includes three arch legs connected into a star shape having three legs, and includes a deck-type arch-footed V-shaped pier, where the deck-type arch-footed V-shaped pier is disposed at a rear end of each arch leg. The deck-type arch-footed V-shaped pier has a top connected to the arch leg and a bottom hinged with a pile foundation of a bearing platform pre-poured on a construction ground. A tie rod is connected between the rear end of the arch leg and the pile foundation of the bearing platform, and an anchor cable tensioning structure configured to tension the tie rod is disposed on the pile foundation of the bearing platform. The present disclosure meets requirements for mounting a large-span bridge arch on a soft soil foundation, and implements mounting effect of the large-span bridge arch.