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Construction Method of Bridge Superstructure


Place without pre-casting method venues, and does not require large-scale lifting, transportation equipment, the reinforcement beam may interrupt, bridges overall good. Its main drawback is the long construction period, construction quality is not easy to control; of prestressed concrete beams the concrete shrinkage, creep stress loss due to relatively large; the construction of the stent, the template consumes a large amount of construction costs; erection of scaffold drainage, navigation during the construction period may be subject to the threat of floods and drifting objects. This paper from China Union WWW.LWLM.COM collected. (2) pre-install method in the pre-plant or in the convenient transportation of prefabricated bridge site near the prefabricated beam field work, and then set up using a certain method of installation. Installation of prefabricated construction method generally refers to reinforced concrete or prestressed concrete beams, prefabricated installation, sub-prefabrication, transportation and installation of three parts. Prefabricated construction method to install the main features: 1, as is the factory manufacturing production, components of good quality and help ensure the quality and dimensional accuracy of components, and as much as possible the use of mechanized construction; 2 , top and bottom structure can be parallel operations, thus reducing on-site construction period; 3, effective use of labor and thus reduce the project cost; 4, the construction speed, construction projects applicable in emergency ; 5, the prefabricated components after a period of time due to the store, so the installation has a certain age, can reduce concrete shrinkage and creep deformation caused. 2, the concrete was divided: (1) Construction Method for in situ fixation in situ pouring method is located in the erection of the bridge bracket,mbt chaussures paris, the bracket pouring concrete bridge, after the removal of the template to achieve strength, support. Place without pre-casting method construction site, and does not require large-scale lifting, transportation equipment, the reinforcement beam do not interrupt the integrity of the bridge well. Its disadvantages are a long construction period, construction quality is not easy to control; of prestressed concrete beams the concrete shrinkage, creep stress loss due to relatively large; construction scaffold templates consumption of large amount of construction costs; erection of row stand Hung, navigation during the construction period may be subject to the threat of floods and drifting objects. (2) cantilever construction method of cantilever construction method is started from the pier and bilaterally symmetrical beam section of the place or precast segment symmetrical to assemble. Cantilever construction, said the former, the latter said the cantilever assembly construction, the two methods sometimes used in combination. Cantilever construction of the main features: 1, the bridge construction process in a negative moment, pier also asked to bear the moment generated by the construction, so construction should be in the operating state of the cantilever structure and construction of state of stress the stress state closer to the bridge in use, such as prestressed concrete T-bridge, variable cross-section continuous beam bridge and cable-stayed bridge, etc.; 2, non-fixed access pier bridge prestressed concrete beam bridge, the use of cantilever construction should take measures to pier, beam temporary consolidation, which in the construction process there are structural system conversion; 3, cantilever construction tools and equipments used many different types to Cradle, the truss is also , cable-stayed and other types can be selected according to the actual situation; 4, Cantilever construction is simple, structural integrity is good, the location of construction can be continuously adjusted, often in the span of a bridge on the selection of more than 100; cantilever speed of construction, assembly method, the bridge superstructure and substructure in parallel operation, but the construction is relatively high precision, 100m in the span of the bridge in the selection of the following; 5, or less cantilever construction method can be used without stents, the construction does not affect navigation or the bridge traffic. (3) Swing Swing Construction is the construction method of the bridge components located at the shore before the bridge (or the side of the road and where appropriate) for precast, until after the design strength of concrete to the construction method of rotating components in place. Construction of the combination of swivel static constant, it is the construction of the bearing position of the rotation bearing and the rotation axis, the bridge after the completion of the situation by supporting the design requirements change. Construction can be divided into flat swivel turn,abercrombie paris, spun the combination of peace and vertical swivel geometric construction. Construction of the main features of Swing: 1, can use the terrain to facilitate the prefabricated; 2, the construction continued during the flight, does not affect bridge traffic, and traffic across the bridge construction on the line ; 3, small construction equipment, installation is simple,franklin marshall pas cher, easy to make and easy to master; 4,sac hermes birkin, save the wood, saving construction materials. Construction and use of cable-free swivel bracket construction compared to wood savings of 80%, saving the construction of steel 60%; 5, to reduce high-altitude operations, the construction process is simple, rapid construction; when the main components of an early close, give future construction convenience; 6, swivel construction suitable for single-span and three-span bridge in the deep water canyons with bridges, but also to adapt to the plain areas and for urban overpass; 7, Rotating Construction of bridge will make better use of technical and economic benefits, swivel lighter weight, a variety of technology utilization, is the large span and large span bridge construction favorable competitive program.
     
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