The high-density polyethylene ( HDPE ) steel skeleton reinforced drainage pipe produced by Sichuan Datong Pipeline Co., Ltd. has obtained a national utility model patent (patent number: ZL200820140945.3 ).

High-density polyethylene ( HDPE ) steel skeleton reinforced drainage pipes have both plastic corrosion resistance and steel toughness, so its superiority is obvious.

1, the ring height is high. After testing and engineering use, ring stiffness ≥ SN8, up to SN16, is unmatched by ordinary plastic pipes.

2, good corrosion resistance, HDPE corrosion resistance is very good, after the anti-corrosion treatment of shaped steel belt completely buried in HDPE, pipeline life of more than 50 years.

3, no leakage, advanced structure, between the strip and the strip to take the advanced voltage heat welding, seams evenly.

4, easy to install. Due to the double flat structure of the inner and outer walls, the socket connection between the pipe and the pipe, the pipe and the inspection well is adopted. The installation is convenient and the installation speed is fast.

5, transportation costs are low, the equipment can be transported near the site of the project, greatly reducing transportation costs.

6, anti-sedimentation. The wall structure design is reasonable. Advanced technology, so that high-density polyethylene (HDPE) steel skeleton reinforced drainage pipe with steel soft performance. It can effectively resist formation settlement.

Installation and construction points

Pipeline loading and unloading

During loading and unloading, flexible belts, slings or slings shall be used for lifting. No steel wire rope or chain shall be used to lift the pipeline. The pipeline shall be hoisted with two supporting points. It shall not be directly hoisted to hoist the two ends of the pipe.

Pipeline transportation

For short-distance transport, do not roll on hard, uneven ground or gravel floors to prevent damaging the pipeline protective layer. Large-diameter pipes (diameter greater than 1000mm) should not be stacked and transported, and their height should not exceed 4 times the pipe diameter. The contact area between the car and the bottom of the ship is required to be flat, and it should be fixed to the transportation tool with a flexible belt or rope to prevent rolling and collision, and it must not touch the sharp objects to prevent the pipe from being punctured.

The laying of pipelines

The foundation requirements, backfill materials, backfilling process and backfill density of the pipeline shall comply with relevant regulations. When the pipe is installed and installed, it shall meet the requirements of the “Combined action of soil and pipe”. The conditions for guaranteeing the "combination of soil and earth" are:

1 Stability of foundations and trench walls: Selection of backfill soil and backfill density.

2 The degree of backfilling and compactness of dead angles (pipes) in contact with the pipeline.

3 The width of the trench.

4 design documents and construction drawings.

5 pipeline geological and hydrogeological data.

6 construction plan and construction organization design.

7 Accurate information on existing underground pipelines and other obstructions along the line.

Pipe ditch

The high-density polyethylene steel-plastic reinforced winding drainage pipe trench shall be on a stable and solid soil layer; otherwise, reinforcement measures shall be adopted, and the determination of the stable soil layer shall be performed by the "Standard for Geotechnical Test Methods" GBJ123-88. The base thickness should be determined according to the category, but the minimum thickness should not be less than 50mm, and the actual pressure coefficient should be greater than 0.85. When excavating the trench, ensure that the sides of the trench are stable, the soil layer is not disturbed, and the base of the trench is encountered locally. In the case of soil layers, the replacement shall be removed, and the replacement thickness shall be implemented in accordance with relevant regulations.

Backfill material

The backfill material in the pipe area should be sifted with a maximum particle size of no more than 40mm and no sharp corners, sharp edge blocks, bricks

Other materials such as low-plastic organic soil, high-plastic soil, high organic soil, frozen soil, expansive soil, and waste soil are strictly prohibited as backfill.

Pipe installing

Pipeline installation can only be carried out after acceptance of the pipe foundation pipe gasket (cushion). In the process of lowering the tube, it is forbidden to roll the tube freely from the top to the bottom. After the pipeline is in place, it is forbidden to drop the stones and heavy objects.

Backfill process

When carrying out foundation treatment at the bottom of the trench, it should be stratified and compacted. The degree of compaction should meet the following requirements:

1 Pebble foundation, its relative density should not be less than 70%.

2 gravel base, its relative density is not less than 75%.

3 The density of prime soil, lime soil or double-ash foundation shall not be less than 85%.

(4) The hard bottom of rocks, pebbles or gravel should be provided with a pipe mat (cushion) with a thickness of not less than 50mm.

5 The material of the pipe mat should adopt plain soil, lime soil or double ash soil as the matting layer, and carry out compaction treatment. Its density should not be less than 85%.