260T Truss Type Concrete Highway Bridge Girder Launching Erection Gantry Crane
Product Description
260T Truss Type Concrete Highway Bridge Girder Launching Erection Gantry Crane description. The author applies to highway, railway bridges to the construction site of bridge construction, its main function is to mention prefabricated good beam slice and delivered on prefabricated good piers.it and general meaning cranes have very big different, high safety requirements.
Girder inspection
The main beam is the main source of force for the bridge crane. The main beam of the bridge crane is usually welded from steel plates. The main beam is the main bearing component of the bridge crane. In addition to the steel material requirements that meet the design requirements of the bridging machine, the welding quality of the steel plate butt welds must meet the design standards. This requires non-destructive testing of the main beam of the electric single-girder bridge crane to meet the requirements. Today we will discuss the inspection rules for bridge girder.
Before welding rail bridge joints, carefully clean the grooves and nearby oil and rust until a metallic luster is revealed. Welding consumables are matched to basic electrodes according to the same strength standards.
The welding process of the butt welding of the main beam is complicated and prone to defects such as incomplete penetration, inclusions, pores, hot cracks and cold cracks. In particular, thermal stresses from butt welds can endanger the connection to the weld. Microscopic defects at the base metal edges, such as diffused inclusions, uneven intergranular structures, etc. These micro-defects will expand under the effect of welding heat, resulting in strong thermal stress at the joint between the weld and the base metal. When the stress reaches a stress that the material itself cannot withstand, macro cracks or delayed cracks will appear on the steel plate and the weld. Therefore, non-destructive testing of bridge girder is one of the important links to ensure the quality and security of the girder.
After the non-destructive testing of the welding quality of the butt weld of the steel plate of the electric bridge machine, the problems caused by welding can be completely avoided, and the operator can operate it very carefully.
Bridge Girder Launching Erection Gantry Crane Brake
Due to its heavy weight, Bridge Girder Launching Erection Gantry Crane can only know that it has a large inertia once it is running. According to the safety operation specifications of bridge cranes, sudden braking is prohibited during operation. From a security point of view, it is very scientific, because if the brakes are applied immediately, the entire bridge machine will generate large torque due to strong inertia, which is very fatal to the transmission system. In severe cases, twisting the drive shaft can even cause the entire machine to deform.
Sudden reverse braking may also cause a violent impact on the gear coupling system, an accident, and adversely affect the motor. Therefore, the use of double-girder cranes is required to be professional operators. Every time they are used, they should be carefully checked and security placed in an early position. If you find that some places do not meet security requirements, you must not force yourself to work. The manufacturer performs maintenance to ensure safe use.
The welding process of the butt welding of the main beam is complicated and prone to defects such as incomplete penetration, inclusions, pores, hot cracks and cold cracks. In particular, thermal stresses from butt welds can endanger the connection to the weld. Microscopic defects at the base metal edges, such as diffused inclusions, uneven intergranular structures, etc. These micro-defects will expand under the effect of welding heat, resulting in strong thermal stress at the joint between the weld and the base metal. When the stress reaches a stress that the material itself cannot withstand, macro cracks or delayed cracks will appear on the steel plate and the weld. Therefore, the nondestructive inspection of the crane main beam is one of the important links to ensure the quality and security of the main beam.
Double girder bridge crane can only be used for transporting heavy goods, no people carried or flammable and explosive dangerous goods.
On-site Installation
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Concrete Highway Launcher Crane Bridge Girder 260T Truss Type 10 - 50m Span Images
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