In view of bad communion of butterfly pass system for angle steel,the structure was inproved of the pre-finishing pass.

Study on rolling high precision heavy rail with the full-universal finish pass;

The finish size and shape of the heavy rail rolled by semi-universal finish pass and universal finish pass were studied,and the test was carried out.

In order to improve the shape precision on the tread and the size precision of rail height of 60kg/m heavy rail, the method of rolling heavy rail with the full-universal finish pass was advanced based on the half-universal rolling method.

The entry guide and guard of final pass was changed to roller guide and guard for round and channel steel.

In this experiment, the elements and techniques of pore forming and interconnection were discussed.

Combined with the spillway reconstruction work of Yanchun reservoir in this paper according to some practical construction technologies such as pore forming of cast in place pile, fabrication of steel reinforcement cage and concrete pouring corresponding quality control measures are proposed in order to ensure the integral construction quality.

The tamping technology, pore forming, quality inspection and other construction techniques in foundation treatment using lime soil compaction pile are introduced, which is a simple and effective measure to eliminate collapsibility, enhance bearing capacity and reduce compressibility of foundation.