Anchor bolts are tools that are buried in the ground or foundation to connect the ground or foundation to machinery and equipment. Q235 steel is generally used, which is round. Rebar (Q345) has high strength, and it is not easy to make the thread of the nut. Although the role of the anchor bolt itself is undeniable, after the installation of the anchor bolt, after a period of application, due to various factors, it will cause failures and affect the firm function of the anchor bolt of rail fastening system. So, how can we avoid fatigue damage to the anchor bolts of rail fastening system when applying anchor bolts?
Deviation handling skills. For bolts that are too high during installation, the high part should be cut off and threaded. When setting the thread, care should be taken to prevent impurities from being mixed into the concrete primer to make it contaminated. When the bolt position is low, the bolt can be baked red with an oxyacetylene flame and then stretched. The elongation method uses two pads to pad the bottom of the bolt, and then wrap the steel plate with the hole in the middle of the side frame to the bolt, and at the same time tighten the upper end with a nut, and straighten the red part of the bolt with the help of the screw force of the nut. For reinforcement, two or three steel plates can be welded at the narrowed diameter.
Prevent fatigue damage after installation. After the installation is completed, the anchor bolts are often broken and damaged due to frequent use on large mechanical equipment under impact load. In most cases, the damage is caused by multiple cumulative effects of small energy impacts, causing the anchor bolts of rail fastening system to break due to excessive strain. Therefore, it is necessary not only to ensure that the installation process meets the standards, but also to do post-maintenance and reinforcement frequently to extend the bolt life and prevent aging.
Bolt axis and verticality control. When deploying the axis, the surveyor should first control the end of the axis, and after leveling and aligning, use the centerline cast point to determine the horizontal and longitudinal axis. When projecting the center line with the total station instrument, a long angle steel should be welded longitudinally at the two ends of each axis, ie at the midpoint, and a small groove should be carved on the top axis, and then use a steel tape or steel ruler according to the drawings on the drawing. The mark size is measured by the distance between the centers of two adjacent bolt supports.
Protection of bolts of rail fastening system. After the installation is completed, it is necessary to check and accept whether all the indicators are qualified, and take protective measures for all the screws of the bolts in time to avoid damage to the screws during pouring. In order to prevent the screw rod from being corroded by the concrete, the ideal method is to coat it with a layer of butter, wrap it with a plastic film, and cut it into a 300mm length with a slightly larger PVC pipe and set it on the screw rod. In this way, not only can it prevent rust, but it can also prevent damage from external forces.
Anchor bolts are an important part of the rail fastening system. Kingrail Parts can produce anchor bolts according to customers' drawings. Consultations from railway construction and maintenance companies are welcome.