The mechanics-deformation patterns of HPDE spiral pipe and pipe-soil interaction mechanisms in various experimental stages are analyzed based on the test data and properties of soft soil in Shanghai,which offeres the theoretical basis for its application in engineering field.

Old pipeline rehabilitation construction by using the HDPE pipe insertion lining in Handan

In order to solve maintenance problems of water supply pipelines,a rehabilitation technique of HDPE pipes that have the features of high strength,anticorrosion,long service life,smooth wall surface and antiscaling was developed.

The essay introduced the characteristics of HDPE pipe s application in drainage systems.

This article analyzes occurrence mechanism and reason of forming weld protruding of spiral submerged arc welded pipe and influence of peaking to protruding of steel pipe,and also put forward effective control method such as draw up the best process parameter,make steel plate edge shape norm,prebending steel plate edge to settle protruding problem.

In accordance with specialty of double wires welding process of inside welding for spiral submerged arc welded pipe,a set of internal welding double wires welding unit is developed.

Mathematical analysis for the diameter tolerance of spiral welded pipe;

Improvement upon the lubrication of forming rollers for spiral welded pipe;

In way of weld field,the article introduces application foreseeing of this technology,also discusses this technology application into 4 aspects:forming roller design and manufacturing,design of longitudinal welded pipe mill,the control of deform process and forming stress in longitudinal welded pipe in production,and the control of pipe residual stress in spiral welded pipe in production.