By in situ embedding test for RCC arch cofferdam of Dachaoshan Hydroelectric Plant in combination with cooling water pipe efficiancy of Shapai Hydroelectric Plant,it is indicated that by using high strength polyethylene pipe material the RCC construction has small disturbance and good effect.

Comparative study on mechanical tensile properties of high-strength polyethylene and common polyethylene nets woven by machine in English knot type for fishing;

Comparisons between the structure and properties of high-strength polyethylene (HSPE) and common polyethylene(PE) monofilaments for fishing gear have been made by differential scanning calorimetry(DSC), wide angle X-ray diffraction(WAXD) and scanning electron microscopy(SEM) etc.

Combined with concrete survey of project,it illustrates functional features of HDPE pipe,introduces important points & difficult points of project, and discusses main constructive methods from aspects of digging pitch、construction of basic pipe and installation of pipe.

In this paper the writer compared HDPE pipe with concrete pipe on cost of construction, time limit for a project, hydraulic condition and others, points out that HDPE pipe possesses some advantages such as lighter weight, lower comprehensive cost and shortening time in construction.

Introduction to high density polyethylene pipe;