Method for rapidly cold-extracting scrapped nylon sleeve in concrete sleeper and special drill jig

Abstract

The invention discloses a method for rapidly cold-extracting a scrapped nylon sleeve in a concrete sleeper and a special drill jig. The method comprises the following steps of: adopting a stepwise working method, namely, drilling a plurality of key slots in the inner wall of the scrapped nylon sleeve at first, and then clamping wedges in the inner cavity of the scrapped nylon sleeve along the plurality of key slots, then locking the wedges by a torque wrench to loosen the scrapped nylon sleeve relative to the concrete sleeper until the scrapped nylon sleeve is unscrewed out of the concrete sleeper. The special drill jig is provided with a drill jig body, wherein drill bushings are arranged on the drill jig body; and the special drill jig is characterized in that the drill bushings are uniformly distributed on the drill jig body, a location boss matched with an unthreaded hole in the upper part of the inner cavity of the nylon sleeve extends outwards from one side of the drill jig body, a guide rod inserted in the inner cavity of the nylon sleeve extends from the location boss, and arc-shaped grooves concentric with the drill bushings are formed in the periphery of the guide rod. The whole operation method is simple and reliable, and free from damages on cement internal threads in the nylon sleeve and the concrete sleeper, thus guaranteeing time-saving, labour-saving and high-efficiency replacement of a new nylon sleeve.

Description

technical field [0001] The invention belongs to the technical field of railway traffic, and in particular relates to a method for quickly cold-taking scrapped nylon sleeves in concrete pillows and a special drilling mold thereof. Background technique [0002] The nylon casing of the concrete pillow is cast in the concrete pillow, and the pressing plate presses the rail on the concrete pillow through bolts fastened in the nylon sleeve. The part of the backing plate of the speed-up turnout and the nylon bushing of part of the turnout near the straight section of the wheel guard rail will swell due to the corrosion of the bolts. When there is an empty hanging plate, when the train is crushed, the sleeper bolts at the non-stressed straight (curved) strands of the rail are pulled out to make the nylon sleeve invalid. It is necessary to take out the failed nylon sleeve from the concrete pillow, and install a new nylon sleeve in the place of the original nylon sleeve. [0003] Th...

AI Technical Summary

Problems solved by technology

During the heating process, it often happens that the heating temperature is too high and the nylon sleeve is ignited

In addition, the heating time is long, and the sleeve removal efficiency is low

Therefore, the existing removal method has the threat to the safety of train operation, is easy to damage the cement thread in the original concrete pillow hole, and has nylon fragments bonded in the original concrete pillow hole, resulting in casing maintenance failure, low maintenance efficiency and high labor intensity. insufficient

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