Novel pipe jacking method for preparing thick-walled steel pipe

Abstract

The invention provides a novel pipe jacking method for preparing a thick-walled steel pipe. The novel pipe jacking method for preparing the thick-walled steel pipe comprises the steps of carrying outpipe jacking treatment and sizing reduction treatment on a continuous casting blank with diameter of 230-270 mm by using a core rod with diameter of 145-180 mm to obtain the thick-walled steel pipe with external diameter of 133-219 mm and wall thickness of 12-20 mm. According to the novel pipe jacking method for preparing the thick-walled steel pipe, by using the pipe blank which is much larger than the core rod, a perforating machine obtains a pierced shell with larger thickness; three hole patterns are additionally arranged before pipe jacking to realize deformation of the pierced shell withlarger thickness; and pipe jacking achieves a purpose of increasing the total large deformation of the thick-walled steel pipe so that the pipe jacking length of the thick-walled steel pipe is equivalent to that of a thin-walled steel pipe. According to the novel pipe jacking method for preparing the thick-walled steel pipe, the pipe jacking length of the thick-walled steel pipe can be effectively increased to achieve a purpose that the thick-walled steel pipe is as long as the thin-walled steel pipe; and therefore, the yield of the thick-walled steel pipe is increased, and the production efficiency is enhanced.

Description

technical field [0001] The invention relates to the field of preparation of special steel equipment, in particular to a novel pipe jacking method for preparing thick-walled steel pipes. Background technique [0002] The pipe jacking machine is mainly used to produce thin-walled steel pipes, and the wall thickness is generally below 8mm. The background of the piercing machine matched with the pipe jacking machine is not long, and the perforation capillary is generally short, usually below 6m. With the diversification of market specifications, the pipe jacking machine also needs to undertake some thick-walled steel pipes such as 12mm-20mm wall thickness. Due to the small extension of the pipe jacking of thick-walled steel pipes, the length of the pipe jacking is short, and the length of the pipe jacking machine cannot be effectively utilized. The output is low and the finished product rate is low. Therefore, how to effectively solve the problem of short pipe jacking length i...

AI Technical Summary

Problems solved by technology

Therefore, when using the pipe jacking unit to make thick pipes, the extension of the pipe jacking is small, the length of the pipe jacking is short, and the mandrel length of the pipe jacking cannot be effectively utilized.