Support is an important structural component that connects the upper and lower structures of a bridge, located between the bridge and the pad stone. It can reliably transmit the load and deformation (displacement and angle) borne by the upper structure of the bridge to the lower structure of the bridge, and is an important force transmission device of the bridge According to different standards, bridge bearings can be classified into different types. According to the production materials, it can be divided into steel bearings, polymer sliding bearings, rubber bearings, concrete bearings, and lead bearings; According to the possibility of bearing deformation, it can be divided into fixed bearings, unidirectional movable bearings, and multi-directional movable bearings; According to whether it can withstand tensile force, it is further divided into compression only support and tension compression support; According to the function of the support, it can be divided into conventional support and seismic isolation support; According to the structural form of the support, it can be divided into arc-shaped support, rocker shaft support, roller shaft support, plate type rubber support, PTFE plate type rubber support, basin type rubber support, and spherical support. Different types of supports have different working principles. Steel bearings transmit force through the contact surface between steel and steel, and their displacement is mainly achieved through the rolling of steel and steel. They have strong load-bearing capacity and can adapt to the displacement and rotation needs of bridges. The structural principle of the basin type rubber bearing is that the rubber blocks placed in a sealed steel basin generate a reaction force under three-dimensional force to withstand the vertical load of the bridge, while utilizing its own characteristics to meet the rotation of the beam end and the horizontal displacement of the upper structure The selection of 02 bearings Bridge bearings are mainly used in railway bridges, highway bridges, urban overpasses, elevated bridges, and other projects, and can also be used in large building structures. But with so many types of supports, each with different characteristics, how should one choose when using them? Due to different indicators such as the specific structural form, span, load level, fulcrum reaction force, and deformation degree of the bridge, as well as different types of traffic on the upper part of the bridge at different positions, whether the bridge is located in an earthquake prone area, etc., different requirements are put forward for bridge bearings. Therefore, when choosing a type of bearing, it is necessary to refer to these specific factors. For highway bridges and some small highway bridges, due to their small span, small reaction and deformation of the upper structure, plate rubber bearings are generally used. For large and medium span continuous bridges crossing highways, railways, rivers, and seas, due to their large span, large reaction forces and deformations of the upper structure, basin type rubber bearings or spherical bearings are generally selected. According to the inherent characteristics of railway bridges, basin type rubber bearings and steel bearings are generally used. In addition to these conventional supports, in some special environments, it is also necessary to choose to use some special types of support products. For coastal and cross sea bridges, due to the severe corrosion of the environment on the bridge and the support itself, in order to ensure the service life of the support, corrosion-resistant bearing products, such as corrosion-resistant ball bearings, are often used. Due to the vast territory of our country and the low environmental temperature in high latitude and mountainous areas in the north, low-temperature bearings are often used to ensure steel stress. For highway and railway bridges that are prone to earthquakes, in order to reduce the damage caused by earthquakes, seismic bearings or seismic isolation bearing products are now commonly used. For bridges with upward reaction forces in the upper structure, tension compression bearings are generally used. For bridges with floating structures such as suspension bridges and cable-stayed bridges, it is generally necessary to choose wind resistant support products in the transverse direction of the beam body. In addition, there are also some options that may be affected by the construction method, such as for bridges crossing railways or high mountains and canyons, in order to not interfere with railway operation and reduce construction difficulty, the swivel method is often used for construction, so swivel ball joint products are often used. In short, when selecting bridge bearings, the principles of economy, safety, practicality, and ease of maintenance should be followed to avoid unnecessary resource waste As an important component of bridges, the selection of appropriate bearings for 03 bearing inspection can better play its role. If there are quality issues with bearings in application, there will be significant safety hazards. The performance of bridge bearings is not only closely related to the structural safety of the bridge, but also directly affects the service life of the bridge. During the use stage of bridges, damage to the bridge deck and beam ribs may occur due to natural aging of the bridge structure or damage from external forces. If problems occur with the bridge support as a buffer component, it may have a fatal impact on the bridge. Under long-term stress and environmental effects, bearings are prone to cracking, severe shear deformation, detachment, misalignment, and inability to slide normally. Many diseases are caused by various reasons, but the quality problem of the support itself is the most fundamental manifestation. For example, the PTFE plate type rubber bearing is prone to problems such as detachment between the PTFE plate and the rubber layer, and uneven surface of the PTFE plate. In order to reduce problems during the use of the bearing, it is necessary to conduct inspection and testing before and during the use of the product. Different types of bearings, due to their different technical standards, require different testing items and indicators. Relevant testing should be carried out based on specific types and combined with specific usage scenarios. Strengthen the inspection of support products, detect and replace problematic products as soon as possible to avoid causing greater engineering quality problems