Abstract:Aizhai Bridge is a steel-girder stiffening single-span suspension bridge, and adopts the rail-cable sliding frame beam method for beam construction. The rail-cable sliding frame beam method can quickly realize the erection of the main beam of the suspension bridge, and has good safety, economy, high quality and high efficiency, and the application prospect is very broad. This paper briefly describes the structure of the rail-cable sliding frame beam system, and focuses on the installation of the lifting saddle of the key components in the rail-cable sliding frame beam method Design, manufacture and inspection.

Abstract:With the rapid development of bridge technology, China has mature experience in the closing construction technology of high-pier and long-span continuous rigid frame girder Bridges, but the selection of closing sequence and closing mode is still the two major problems at present. Based on the background of Qinhe Bridge, this paper studies the influence of several closing methods and closing sequence on the post-completion structure stress and their respective applicable conditions through comparative calculation It provides reference for bridge construction in the future.

Abstract:The steel strand hoist system is the key structure in the process of the suspension boom replacement of intermediate arch bridge. Taking the derrick replacement project of Hezhou Bridge in Hezhou City as an example, this paper introduces the structural design and checking calculation method of the steel strand hoist system, and expounds the application technology of the steel strand hoist system, so as to provide reference for similar projects.

Abstract:It is very important to monitor the prestress of large structures in bridge, along soil and other engineering fields. Bolts are often used to fix components in large structures. When faults such as tilting occur in large structures, the stress carried by bolts fixing components will change. This paper studies and designs a wireless intelligent bolt and monitoring system, which can monitor the prestress carried by these bolts in real time. The wireless intelligent bolt can not only be used individually, but also can be used in networking, so as to flexibly monitor the prestress and structural balance of large structures. At the same time, this paper discusses two kinds of system working mode and its algorithm, the working mode is only the typical working mode of the system, according to the specific engineering application, the working mode can be changed.

Abstract:The mechanical equipment used to apply prestress in bridge engineering is usually called tension equipment. The commonly used tensioning equipment is composed of hydraulic jack and supporting high pressure oil pump, pressure gauge and external oil pipe. Hydraulic jacks can be divided into core jacks and solid jacks according to their structure. The more common tensioning jack on the site is generally a core structure, and its main structure includes a tensioning jacket, a piston and an oil chamber. In order to ensure the quality of the project and construction safety, the jack should carry out factory inspection and type inspection. Taking the YDC3000/58-200 hydraulic jack designed and produced by Liuzhou Overem Machinery Co., Ltd. as an example, this paper mainly studies the type test method of hydraulic jack.

Abstract:Based on the design and analysis of building isolation method in high intensity earthquake area, taking a reinforced concrete frame structure as an example, the finite element analysis software ETABS was used to conduct dynamic analysis of the seismic isolation technology using rubber bearings, and the time-history analysis results were compared. The results show that compared with the seismic frame structure, the period of the bottom isolation frame structure is longer, the layer shear force, displacement, and the bottom layer All the axial forces are smaller, so it is proved theoretically that the seismic isolation bearing can effectively reduce the adverse effects of seismic loads on the structure and improve the safety of the structure.

Abstract:Combined with engineering examples, this paper mainly introduces the use of PLC synchronous intelligent jacking system, the use of its "industrial computer + programmable controller + hydraulic control system" to form a distributed control system, to achieve displacement control synchronization, cyclic jacking, until the jacking height reaches the design requirements, to replace the support construction. This method effectively solves the problem that there is no direct lifting space between the beam bottom and the cover beam, and provides reference and experience for the construction of similar Bridges in the future.

Abstract:With the rapid development of traffic and the maintenance needs of Bridges along the highway, the maintenance and reinforcement construction of concrete hollow slab joints is widely used. This paper mainly introduces the practice and application of secondary circulation pressure injection construction technology in the repair and repair construction of concrete hollow slab hinge joint reinforcement through the repair and construction case of Beijing-Hong Kong-Macao Expressway (G4) Leiyang to Yizhang section, which provides reference and guidance for similar reinforcement and repair projects.