If the machine is loose and tiring, it proves that the torque provided by the internal combustion wrench has loosened the bolts. In this case, it can be loosely combined with a special lengthened handle wrench. The wrench type is as shown. When working, use 2 3 people and pull at the same time. Generally, the torque can reach 500 N m. Most rusted concrete truss vertical bolts can be loosened.
Lengthen the handle wrench (unit: mm) When the above two methods are still not effective, the bolt and the plastic sleeve have been glued together due to rust. At this time, the bolts can be preheated separately to bring the plastic sleeve into a hot melt state to reduce the bonding force with the bolts, and then the above two methods are used. Note: The preheating method of the bolts should not be used as much as possible to avoid reducing the concrete strength of the concrete bolster. When it is not used, it is only possible to heat the bolt cap with water welding, and never burn it to the rail, ballast pad, concrete bolster.
After the bolts of the bolts are broken, if they are not repaired in time, and the knots and empty cranes of the ballast bed are under the impact of the train, it is easy to cut the concrete bolts and the bolts are normal. For maintenance, it is necessary to take out the bolt breaks left in the anchor hole of the concrete sluice after the break, and the removal of the bolt breakage becomes a problem. In the following manner, it is practical to take out the bolt breaks left in the anchor hole of the concrete shackle after the break.
After breaking, if the remaining part is higher than the occipital surface, first remove the ballast pad, and then weld a previously prepared insulating joint with a hexagonal screw directly to the bolt break that remains in the anchor hole of the concrete bolster. together. The purpose of the welding screw is to weld a bolt that is left in the anchoring hole of the concrete sluice, and a point that can be tightened with a wrench. The welding also preheats the bolt and reduces the plastic casing and The bonding force of the bolts. At this time, the bolt of the bolt left in the anchor hole of the concrete sluice can be unscrewed from the anchor hole by directly screwing the screw on the ordinary shank with a <24 single-mouth wrench.
After the cable concrete sluice bolster bolster is changed, the anchor technology line/subgrade is broken, and the remaining part is lower than the bolster surface. The key is to weld a bolt that can be used in the anchor hole of the concrete sluice. Focus on 0. However, when the remaining part of the fracture is lower than the occipital surface, the above method is used to directly weld the insulated joint with the hexagonal screw and the bolt break, because the screw and the concrete shackle anchor the hole wall The gap between the screws is small, the welding rod cannot be inserted in, and the direct welding of the screw and the bolt break can not be performed. At this time, the bolt can be broken or lengthened by the following method and then welded: 1 remove the ballast pad; 2 use a small flat shovel to shovel the plastic casing exposed in the anchor hole of the concrete bolster bolt; 3 with high pressure The wind blows the dirt and other debris in the anchor hole of the bolt; 4 put a common <24 nut into the bolt anchor hole, and weld it to the bolt break end inside the nut; 5 screw the screw into the nut, then the screw The gap between the anchoring hole wall of the concrete bolster can be extended into the welding rod for welding, and the screw and the nut are welded together on the outside of the screw; 6 screwing the screw on the ordinary shank with a <24 single-end wrench The bolt breaks left in the anchor hole of the concrete bolster are unscrewed from the anchor hole of the concrete bolster.
If the bolt break left in the anchor hole is too short, the anchor hole is deep, and it is inconvenient to continue to weld the lengthened bolt with a nut. At this time, it is possible to use a left inner spiral iron pipe of a suitable length like a nut of a lathe, and then a matching left spiral iron rod of a hexagonal screw similar to the insulated joint. According to the above method, the iron pipe and the bolt are broken, and the left spiral iron bar with the hexagonal head is screwed on, and the bolt can be directly broken out by the single-handed wrench with the ordinary shank length. Its welding form is as shown.
In the form of welding, when the bolt breaks left in the anchor hole are obliquely broken, the broken head can be welded horizontally by electric welding to facilitate the next step.
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