How to taking out the pin dowel in concrete sleeper

As we all know dowel area is so sensitive to occur cracks through concrete sleeper, how to take it out without destory concrete sleeper. You will find the anwser here.
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Miley Wang
sales manager

T：+86-18640689880 Whats app:+86-18640689880
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Jinzhou Tiegong Railway Maintenance Machinery Co.,Ltd.
Add:No.1-400, Ruishengjingzuo Building, Jinzhou City, China
T：+86-(0)416-7996209 F：+86-(0)416-7996209 E：miley@tiegong.net
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