HDPE Drainage Pipe Specification Russia

Introduction to steel pipe

The plastic steel hdpe drainage pipe is made of plastic-steel composite special-shaped strips that are spirally wound and lapped (extruded and welded on the lapped surface). The formed pipe has a spiral straight rib structure, and the outer surface of the pipe wall is reinforced by spirally surrounded ribs at equal intervals. The ribs are composed of ordinary carbon structural steel strips coated with high-density polyethylene. The polyethylene pipe wall forms a closed fluid channel, the pipe has sufficient ring stiffness in the hoop direction and good flexibility in the axial direction, and is generally a flexible pipe.  

As a new type of plastic pipe with excellent comprehensive performance that has appeared in recent years, some Russian customers have also learned about plastic-steel winding hdpe drainage pipes. A regular customer from Russia recently asked about the parameters of several plastic-steel winding pipes. As a professional pipe manufacturer, plastic-steel winding hdpe drainage pipes with various parameters can be produced. The following table is the common parameters of plastic-steel winding hdpe drainage pipes. Customers in need can refer to them. If there are customers who need customized products, please leave contact information and requirements.

Construction and performance advantages of plastic steel pipes

Construction advantages of plastic steel pipe

Compared with rigid pipes such as traditional concrete pipes, plastic steel pipes have the following advantages during construction.

(1) The plastic steel pipe reduces the pouring and maintenance of the concrete pipe foundation and pipe seat concrete, and excavates trenches, lays pipes and backfills in one go.

(2) Because there is no need to have the rigidity of rigid pipes, the plastic steel pipes used for the same water delivery volume are lighter in weight, and the investment in pipe transportation and on-site construction equipment is less.

(3) The fixed length of the plastic steel pipe can be up to 10 m. Compared with the 2.4 m of the concrete pipe, the connection length is longer and the joints are less. The sealing and connection methods can be manually operated with simple tools, which is simple and fast.

(4) The plastic steel pipe has good axial flexibility. When laying, the flatness and firmness of the bottom of the trench and the surrounding foundation are relatively low, and the soil work workload is small. Based on the above advantages, the plastic steel pipe has a short construction period, low labor intensity and high work efficiency. If traditional concrete pipes are used, the construction period of this project is estimated to be 45 days, but with plastic steel pipes, the construction will be completed in 30 days.

Performance advantages of plastic steel pipe

Comprehensive mechanical properties

Because plastic steel hdpe drainage pipes are flexible pipes, they are not as rigid as concrete pipes and other rigid pipes. Under the action of external loads, plastic steel pipes can have a large elastic deformation, and they share the load with the surrounding backfill soil to form a pipe-soil interaction. Under reasonable ring stiffness, it can have the same strength and rigidity requirements as rigid pipes. At the same time, due to its good axial flexibility, the plastic steel pipe can resolve the local stress caused by the uneven settlement of the surrounding soil layer through its own elastic deformation, and avoid leakage or damage at the pipe connection due to excessive settlement stress and deformation.

Hydraulic properties

The damping coefficient of the inner wall of the plastic steel pipe is 0.0097-0.01, while that of the concrete pipe is 0.013, and the flow resistance is 20%-30% lower than that of the concrete pipe. Due to the small friction coefficient, the plastic steel pipe is not easy to accumulate impurities to block the pipe. After long-term use, the frictional resistance is almost unchanged, and the water delivery capacity is stronger.

Service life

The plastic steel pipe is made of acid and alkali corrosion-resistant polyethylene completely covering the steel structure. It has excellent corrosion resistance to most industrial waste water and domestic sewage, plus strong aging resistance, and its service life is significantly longer than that of steel pipes.

Comprehensive cost performance

Due to the large price difference of raw materials, compared with traditional pipes such as concrete pipes, the cost of plastic steel pipes is slightly higher. However, the practice of engineering construction and later operation has proved that the construction period of plastic steel pipe is short, the amount of earthwork is small, and the investment in later maintenance is small. The total project cost of plastic steel pipe network is lower than that of traditional rigid pipes such as concrete pipes.

It is precisely because of the construction and performance advantages of the above plastic-steel winding hdpe drainage pipes that many customers in Russia have also begun to understand and import plastic-steel winding hdpe drainage pipes, and plastic-steel winding hdpe drainage pipes are gradually being widely used in Russia. In order to let customers understand more clearly, here is a special introduction to the methods of foundation construction and pipe laying and connection.

HDPE Drainage Pipe Factory

Foundation construction

For general soil quality, a layer of medium-coarse sand foundation layer with a thickness of 100 mm should be laid on the undisturbed soil foundation below the pipe bottom or the foundation that has been backfilled and compacted; when the soil quality of the foundation is poor, gravel with a thickness of not less than 200 mm can be used. The base layer can also be laid in two layers. The lower layer is made of gravel with a particle size of 5-32 mm and the thickness is 100-150 mm. The upper layer is covered with medium-coarse sand with a thickness of not less than 50 mm. For soft soil foundations, when the bearing capacity of the foundation is less than the design requirement or the undisturbed soil of the foundation is disturbed to affect the bearing capacity of the foundation due to precipitation and other reasons during the construction period, the foundation must be reinforced first. Lay a base layer of medium-coarse sand. For pipeline loads, ground soil changes and other factors that may cause uneven longitudinal settlement of pipelines, the foundation should be reinforced before pipeline laying.

Pipe laying and connection

Align the ports of the two pipes to be connected and be as coaxial as possible, and lay the electric heating belt on the inner wall of the joint of the two pipes with the supporting machine. The melting belt is rounded and pressed evenly on the inner wall of the pipe, and all the pressure plates of the machine tool should be neatly covered and pressed on the hot melting belt. Connect the hot-melt welding machine (power supply) to the electric heating circuit of the electric melting belt, and perform electric heating and welding according to the welding process parameters such as current and power-on time provided by the pipe manufacturer. After welding, carry out natural cooling (generally ≥ 40min). During the cooling process, it is not allowed to move the welding equipment, and ensure that the joint is not affected by external force. Only after cooling can the equipment be removed.

HDPE Drainage Pipe Construction

However, plastic-steel winding hdpe drainage pipes also have deficiencies in construction. In order to let customers from Russia and other countries know more about this kind of pipes, plastic steel pipes are flexible, and vertical diameter deformation will occur during construction and use. The deformation should be strictly controlled. . There are strict regulations on the setting of the detection point of the vertical diameter deformation rate, the allowable value and the correction treatment of the detected pipe exceeding the standard. Different from traditional rigid pipes, during the construction process, it should be operated in strict accordance with the technical requirements to ensure the construction quality of plastic steel pipes. At the same time, the main material of the plastic steel pipe is polyethylene, and the pipe body has poor resistance to external rigid impact. Care should be taken to protect the pipe during transportation and construction.

Customers can choose the pipes according to the advantages and disadvantages of plastic-steel winding hdpe drainage pipes. If you have any more professional questions, welcome to consult.