For a city's construction, polyethylene PE pipes play an extremely important role. Because for cities, the construction of drainage pipelines is particularly important, and this role is particularly reflected in the rainy days, for the discharge of rainwater. Therefore, a reasonable PE PE pipeline construction plan is of vital importance to the city or other construction work. Today, Xiao Bian has put together a construction plan for the PE pipeline and hopes to help everyone.
Introduction
PE is polyethylene. The application range of general PE pipe water supply pipes is below 40°C and cannot be used for hot water pipes. PE pipe is a highly crystalline, non-polar thermoplastic resin. The appearance of the original HDPE was milky white, with a certain degree of translucent in the thin section. PE has excellent resistance to most living and industrial chemicals. Certain types of chemicals can cause chemical corrosion, such as corrosive oxidizers (concentrated nitric acid), aromatic hydrocarbons (xylenes), and halogenated hydrocarbons (carbon tetrachloride).
China's plastic pipeline has developed rapidly and its quality has been continuously improved. At present, a plastic pipe industry dominated by polyvinyl chloride (PVC-U) pipe, polyethylene (PE) pipe, and polypropylene (PP-R) pipe has been initially formed. Among them, polyethylene (PE) pipes are widely used in building water supply, construction drainage, buried drainage pipes, building heating, gas transmission and distribution, gas pipelines, electrical and telecommunications protection casings, industrial pipes, due to their unique advantages. Agricultural tubes. It is mainly used in urban water supply, urban gas supply and farmland irrigation.
Pe pipeline construction plan
First, preparation before construction
(1) The construction unit should have corresponding qualifications, and the engineering construction personnel should have the professional installation technical qualifications.
(2) The construction drawings and other relevant technical documents are available and approved by the meeting; and there are design units who have made technical disclosures.
(3) The material to the construction site meets the design requirements, and the construction equipment and on-site environment can ensure normal construction.
Second, PE pipe hot-melt welding (injection socket connection, fused socket connection, hot melt saddle welding connection) and butt welding (injection, docking) technical points.
(1) The broken material of the pipe should be measured according to the length of the measured pipe. Cutting tools should use special pipe cutters and cutters. Pipes with dn≥40mm should be mechanically broken. After the material is cut off, the section of the pipe should be smooth and burr-free, and the section should be perpendicular to the axis of the pipe.
(2) In the hot melt butt jointing tool, the two corresponding parts to be connected should be straightened so that they are on the same axis, and the wrong side should not be more than 10% of the wall thickness.
Third, quality acceptance
1. In the middle of acceptance, after installation of concealed pipelines is completed, water pressure or air pressure tests are carried out by the construction unit in conjunction with the supervision unit.
2. Overall acceptance of the overall acceptance conditions:
(1) Construction drawings, as-built drawings and design change documents.
(2) Site acceptance records for pipes, fittings and quality assurance materials.
Fourth, hydrostatic pressure test Press the following steps:
1. The pipeline should be slowly injected from the downstream, and the exhaust point should be set at the top of the upstream pipe and the pipeline.
2, according to the design work pressure 1.5 times the hydrostatic test, but the cold water pipe shall not be less than 0.6MPa, the pressure rise time is not less than 10min, the pressure accuracy of the measuring instrument shall not be less than 0.01MPa.
Safety measures:
1. Before the construction, coordinate with the relevant departments of railways, highways, and municipalities. The construction plan can be constructed only after the relevant management department agrees. Especially when carrying out construction under the railway embankment, it is necessary to contact with the railway department at any time to keep track of the situation of passing trains. There must be no excavation or jacking when there are trains passing on the line.
2. Use low-voltage running light transformers for tunnel lighting during excavation and jacking; no open fire is allowed inside the cave;
3. Stop digging when jacking in, stop people on the column and on both sides of the transfer column, all transfer columns must be placed straight;
4. During the hoisting, the personnel in the pit shall make protective measures and have special personnel to direct.
5, PE pipe overhead pipe should be set to wind facilities to prevent oxygen deficiency.
The above points are the summary of this site's small series for everyone to sum up the relevant information of the PE pipeline construction plan, I believe we will have a certain understanding after reading, so that everyone will know a lot, if you have those who want to know You can check it out on our website.
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