Hengshui steel strip corrugated pipe, steel strip reinforced PE spiral corrugated pipe

Reinforced PE spiral corrugated pipe
The steel strip reinforced PE spiral corrugated pipe refers to a double wall spiral corrugated pipe made of high-density polyethylene (PE) as the substrate, formed into a waveform using a steel strip coated with adhesive resin as the main support structure, and wrapped and compounded with polyethylene material as a whole. It is called a steel strip reinforced PE spiral corrugated pipe.
characteristic
1) Suitable for medium with a long-term temperature not exceeding 45 ℃.
2) Buried plastic drainage pipelines should be designed according to the theory of flexible pipes (the joint action of pipes and soil). At the same time, the vertical variation of the pipeline in the design state shall not exceed 5% of the pipe diameter.
3) The selection of pipe ring stiffness is an important indicator in the design of plastic pipelines, therefore it should be determined by comprehensive consideration of pipeline burial depth, ground load, properties and compaction coefficient of trench backfill soil, and construction load. Blindly adopting high ring stiffness is uneconomical. For pipelines buried less than 1.0m deep under the roadway, the impact of pipeline deformation on the road surface should also be considered.
4) Appearance
The inner surface of the pipe should be smooth, and the external waveform should be regular; The inner and outer walls of the pipe should be free of bubbles and visible impurities, and the weld seam should not detach.
The cross-section of the pipe after cutting should be trimmed and free of burrs.
The steel strip cuts at both ends of the pipe should be on the same longitudinal line of the pipe.
5) The thickness of the anti-corrosion layer, adhesive resin, and outer polyethylene used as the anti-corrosion layer for steel strips should comply with the relevant provisions of CJ/T 225-2006 standard.
6) The physical and mechanical properties of the pipe should comply with the provisions of Table 1.

Physical and mechanical properties of pipes
project
index


Ring stiffness (kN/m2)
SN8
≥8
SN12.5
≥12.5


SN16
≥16


Impact resistance
TIR≤10%


Loop flexibility
No rupture, no detachment of the two walls


Oven test
No delamination, no cracking


Tensile strength of seams
≥1460N


7) Materials
The raw materials used in the production of pipes should mainly be polyethylene (PE) resin, and only additives necessary to improve performance can be added. CJ/T 225-2006 can add at least 35% of "Shante" brand HDPE pipe special materials when producing pipes. The performance of polyethylene should meet the requirements in Table 2.

Performance of Polyethylene (PE) Material
project
require
Internal pressure resistance (80 ℃, ring stress 3.9MPa, 165h) Internal pressure resistance (80 ℃, ring stress 2.8MPa, 1000h)
No damage, no leakage
Melt mass flow rate (5kg, 190 ℃)
≤1.0g/10min
Oxidation induction time (200 ℃)
≥20min
density
≥930kg/m
Environmental stress cracking resistance (F50) b condition
≥1000h
Elastic modulus
≥800MPa
Test the solid wall tube extruded from this raw material


The physical properties of the steel strip should meet the requirements of Table 3, and the appearance should be free of oil, rust, and burrs.

Steel strip performance
project
require
yield strength
160～210MPa
tensile strength
270～350MPa
elongation
≥38%
The adhesive resin used is a resin with good adhesion to polyethylene and steel strip, which can meet the extrusion coating requirements and its performance should meet the requirements in Table 5.

Performance of adhesive resin
project
require
density
0.910～0.950 kg/m
Melt mass flow rate (2.16kg, 190 ℃)
≤5.0g/10min
peelstrength
≥70N/cm
8) Connection method
Pipes can be connected using methods such as hot melt extrusion welding, heat shrink tubing (tape) connection, clamp (Haff sleeve) connection, and electric melting tape connection. If necessary, two connection methods can be combined and applied.

superiority
1. The inner and outer walls of the steel reinforced PE spiral corrugated pipe fittings are smooth and have a low friction coefficient.
2. The steel reinforced PE spiral corrugated pipe has high compressive performance: it can withstand pressures above 750N, so it can be installed openly or concealed in concrete without being damaged by compression.
3. The steel strip reinforced PE spiral corrugated pipe has good impact resistance and heat resistance: the sleeve will not break under normal tamping impact during concrete pouring, and will not soften under condensation heat during construction.
4. Reinforced PE spiral corrugated pipe with steel strip for moisture and acid resistance: It has excellent moisture and acid resistance and will not rust. Each connection is bonded with PVC adhesive according to regulations, which can prevent water from seeping into the pipe and achieve better moisture resistance.
5. The steel strip reinforced PE spiral corrugated pipe will extinguish automatically upon ignition, and the flame will not spread along the pipeline.
6. The sleeve has excellent insulation performance and will not break down under AC2000V, 50Hz immersion. In terms of preventing accidental electric shock, the international trend is towards insulation being better than grounding, and PVC sleeves meet this requirement.
7. Due to the addition of special additives in the steel reinforced PE spiral corrugated pipe, it does not emit odors and attracts insects and mice to bite and damage it.
Requirements for steel strip pipes
When producing steel strip pipes, PE pipes are used as the substrate, and steel strips coated with adhesive resin on the surface are molded into waveforms as the main support structure. They are then wrapped and compounded with polyethylene material to form a single double walled spiral corrugated pipe
When using steel strip pipes, the long-term temperature of the medium should be below 45 ℃; Underground steel strip pipes should be designed according to the theory of flexible pipes At the same time, ensure that the vertical variation of the pipeline in the design state does not exceed 5% of the pipe diameter; The selection of pipe ring stiffness is an important indicator in the design of plastic pipes Blindly adopting high ring stiffness is uneconomical For pipelines buried less than 1.0m deep on roads, the impact of pipeline deformation on the road surface should also be considered
The steel strip pipe needs to ensure the flatness of the inner surface and the regularity of the external waveform; There should be no bubbles or visible impurities on the inner and outer walls of PE pipes, and the welds should be tight without detachment; After cutting, the cross-section of the PE pipe should be corrected to ensure that there are no burrs present; The steel strip cut at both ends of the pipe should be on the same longitudinal line of the pipe
The anti-corrosion layer of steel strip pipe refers to the adhesive resin and outer layer, and its thickness should comply with the relevant provisions of CJ/T225-2006 standard; The physical and mechanical properties of pipes should also comply with relevant regulations
The raw materials used in the production of steel strip pipes are mainly PE pipes, in which only necessary additives that can improve performance can be added, and the content of polyethylene should be above 90%.

Usage: Construction Editing
Firstly, the novel application of steel strip reinforced polyethylene spiral corrugated pipe:
1. PE pipes with smaller diameters can be supplied in the form of long coils, making transportation, laying, and installation very convenient; Flexible PE pipes with larger diameters can generally be connected on the ground and then laid into the trench, making construction very convenient;
2. In some cases, it is not necessary to dig pipe trenches, but to use pipe jacking technology to lay steel reinforced polyethylene spiral corrugated pipes;
3. PE pipes can be laid on the bottom of rivers, lakes, waterways, and seawater using the long pipe sinking method, or PE water pipes can be laid in deserts without digging trenches:
4. PE plastic pipes can be used as internal repair pipes to repair old drainage pipes.
Secondly, the installation of PE large-diameter pipes with steel strip reinforced polyethylene spiral corrugated pipes involves the selection and installation of pipelines, which are the main focus of construction work in the water supply and drainage system and also the key point of municipal water supply and drainage engineering construction.
The screening and inspection of construction materials, as well as negligence in loading and unloading, can have an impact on the quality of pipes. In the process of pipe screening, it is important to conduct a comprehensive inspection of the quantity of pipes required for the construction section, the strict requirements for pipe specifications, and whether there are any quality problems with the pipes. This is an important part of ensuring the normal operation of construction.
Finally, different PE pipes have different uses: the main characteristic of gas pipes is that the connection is relatively reliable, using electric melting to connect, and the strength of the joint is higher than that of the pipeline itself; Has impact resistance at low temperatures.
PE large-diameter pipe steel strip reinforced polyethylene spiral corrugated pipe is more convenient to transport, much lighter than steel pipes, galvanized pipes, and concrete pipes. It is easier to install and transport without using more manpower and equipment, reducing the installation cost of the project.