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Cold Bending Radius
Cold Bending Radius
  Double-wall corrugated pipe uses PE as main raw material. It is a kind of special pipe which is formed by corrugated forming machine after extrusion with extruder. The inner wall of the product is smooth, and the outer wall is corrugated. The product is mainly used as an underground telecommunications optical fiber and protective casing for the pavement of the cable.
Product Features
1.This product is light weight and convenient in transportation.
2.This product has excellent chemical resistance and advantages of acid and alkali resistance, corrosion resistance, being suitable for the chemical industry drainage.
3.This product has small fluid resistance and large overflow, being convenient for maintenance.
4.This product has high impact resistance and high strength, and wouldn’t collapse due to a heavy load pressure to the road.
5.This product has good insulation performance of electrical and telecommunication.
6.This product is convenient for fast construction and installation and won’t be affected by the seasonal variation. The general cost of the project is low.
Technical Parameters
A:The product has color consistency. Generally to say, PE double-wall corrugated pipe is black, but various colors are for option.
B:Cracking, bubbles, color lines or obvious impurities are not allowed to walls, so as to the shortage of corrugation.
C:Double-wall corrugated pipe’s inner wall shall be uniform and smooth, but slight fluctuation is allowed when molding.
D:Double-wall corrugated pipe’s inner wall shall be welded to outer wall and no disconnection shall occur.
E:Double-wall corrugated pipe can bend below 2% in the same direction.
F:Friction Coefficient
The friction coefficient between the inner wall and low density sheathing shall be: less than or equal to 0.363 when storing; bentonite clay shall be less than or equal to 0.155.
G:Cold Bending Radius
When double-wall corrugated pipe is bent to the minimum bending radius by a bending machine, pipe wall can not be broken. The minimum bending radius is shown in the following table.

Nominal Diameter, mm 110/100 160/150
Minimum Bending Radius, M 5 5

Technical Specifications for Pipelines

Projects Technical Index
1. Drop Hammer Impact Test (0℃) 9/10 no crackings
2. Ring Stiffness (KN/m2) ≥6.3
3. Flat test (when the deformation of the original diameter in the vertical direction is 40%, unload it immediately) No crackings, no delamination
4. Connected Sealing Test No leakage

Specification and size

Nominal Diameter Permissible Deviation of External Diameter Minimum Inner Diameter Length
110/100 +0.4
97 6000
160/150 +0.3
148 6000

Instruction to Double-Wall Corrugated Pipes
1. This product mainly serves to protect communication cables;
2. Trench clearing and leveling goes first before the usage and natural land clearing is not required. First of all, place a layer of pipes and then secure brackets. Generally three brackets are necessary for each pipe. If brackets not required, wood or steel stakes of a diameter of 2-3cm can be used for pipes locking (as per the number of buried pipes). There are 2-3 stacks for each pipe. The purpose of applying brackets and stacks is to keep a certain clearance between pipes and to fill in soil or sand. The principle is that a layer of soil or sand is required for a layer of pipes, otherwise false compaction may occur. Stacks shall be withdrawn after the completion of construction. When sand required, please water the sand for compaction. Such procedure is called water compaction, as a result, the sand after being watered may become solid thereafter.
The main road and other large load-bearing sections need to be filled by cement mortar at the space between pipes and between trenches. The bigger the interval is, the higher the mortar label requires. The more the mortar fills, the greater the pressure is. The mortar thickness is normally 2-3CM but can be up to 5CM. At last, fill up with soil then tamping it. If there are bricks, stones or other objects, fill the sand into the pipe for 5CM, and then fill up with soil and tamp it.
3.While connecting the socket, first of all, set the sealing ring into the second groove uniformly and smoothly.Then lubricate the joints and the pipe’s head with lubricant tube (can be replaced to soapy water or detergent water) to reduce the friction coefficient. Next, at the other end of the pipe, use a piece of wood which is bigger than the diameter of pipe as a medium, then use the iron hammer tapping on the wood. The pipe should be inserted in place (which can be determined according to the ring position).
4.If several layers need burying, the buried depth of pipes on the top should be 90-100CM.
5.The middle part of the pipe can be moved avoiding from being broken.
The above methods are in favor of economic costs and quality guarantee. Total cement covering helps to prevent pipes from being damaged. But noncompaction between pipes can’t guarantee the quality as well.
Using Range
1.Uderground of municipal construction, drainage, sewage pipeline.
2.Chemical industry, mine mountain fluid transportation, industrial sewage.
3.Cable, telecommunication sheath pipeline.
4.Pre-buried pipeline on expressway and railway.
5.Farmland irrigation and drainage.
6.Underground drainage and sewage for residential community and public buildings.