A method for rapidly cooling scrapped nylon sleeves in concrete pillows
A nylon casing, fast technology, applied in the direction of laying tracks, roads, tracks, etc., can solve the problems of casing maintenance failure, operational safety threats, low casing extraction efficiency, etc.
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[0021] Such as figure 1 , 2 , The special drilling jig shown in 3 and 4 for quick cold extraction of scrapped nylon sleeves in concrete pillows has a disc-shaped jig body 2, four drill sleeves 1 are evenly arranged on the jig body, and one side of the jig body faces outward. There is a positioning boss 3 that matches the light hole on the upper part of the inner cavity of the nylon sleeve 8. The positioning boss 3 is extended with a guide rod 5 that is inserted into the inner cavity of the nylon sleeve 8. The outer circumference of the guide rod is provided with an arc-shaped concave hole that is concentric with the drill sleeve. Slot 4. The diameter of the guide rod matches the diameter of the inner cavity of the nylon sleeve, and the diameter 6 of the circumscribed circle of the arc groove of the guide rod is smaller than the minor diameter of the outer arc thread of the nylon sleeve. The end of the guide rod is tapered for easy insertion.
[0022] A method for quickly co...
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