HDPE Plastic Corrugated Tube for Pre-Stress Cement

Brand Name	Qingdao Yifeng Plastic Machinery		Place of Origin	China
Model Number	SBG-50；SBG-70；SBG-85；SBG-100；SBG-130；SBG-140；SBG-160

As the pore-forming material damaged, the slurry is the last protective barrier of prestressed steel in the prestressed concrete structure. Plastic corrugated pipes is a new type of pore-forming material compared with metal corrugated pipe. It has below characteristic:SBG(B) plastic corrugated pipes raw material is HDPE.Its corrosion resistance is far superior to the metal,corrosion resistance,no corroding for itself,can effectively protect the prestressed reinforcing from corrosion. Many prestressed structure under the influence of serious external,if deicing ice salt or salt water. When the component of the waterproof layer, due to the failure of the leakage and drainage facilities or failure of obstruction, prestressed reinforcing will be affected by corrode action.(FIP construction guidelines (1990))said“The prestressed reinforcing filling”indicate that metal pipes hasn’t permanent corrosion resistance,not resistant to water leakage and reach to slurry and prestressed reinforcing. While SBG (B) plastic corrugated pipe can provide a kind of barrier protection　role for prestressed reinforcement which is far superior to the matel corrugated pipe,to prevent pollution of harmful substances penetrate the pipes, ensure post-tensional prestressed structure has better durability. At the same condition, the friction coefficient of preset hole for plastic corrugation pipe are distinctly smaller than that of metal pipe, reducing friction loss of prestressing in the course of tension. Generally, friction coefficient of the plastic corrugated pipe is 0.14, while for metal corrugated pipe it is 0.25; the SBG(B) plastic corrugated pipe has high strength,bearing jam on and it is not demolition by vibrating holding,and it’s airproof performance and leakage resistance is superior to that of metal pipe, more suitable to vacuum grouting. SBG(B) plastic corrugated pipe don’t conductive, can prevent the stray current corrosion, but metals are good conductors of electricity; SBG(B) plastic corrugated pipe has better hard working performance, can greatly improve the component of anti-fatigue capability.
Diagram 1 Circular Plastic Corrugated Pipe Specification

SBG-50	Ø50	Ø61	Ø2
SBG-70	Ø70	Ø81	Ø2
SBG-85	Ø85	Ø99	Ø2
SBG-100	Ø100	Ø114	Ø2
SBG-130	Ø130	Ø145	Ø2.5
SBG-140	Ø140	Ø155	Ø3
SBG-160	Ø160	Ø175	Ø3