PE pipe construction scheme

2022-07-22
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PE pipe is a kind of thermoplastic resin with high crystallinity and non polarity. The appearance of the original HDPE is milky white and translucent to a certain extent in the thin section. PE has excellent resistance to most domestic and industrial chemicals

polyethylene PE pipes play an extremely important role in the construction of a city. Because for cities, the construction of drainage pipelines is particularly important, especially in rainy days, for the drainage of rainwater. Therefore, a reasonable construction scheme of polyethylene PE pipeline is of great importance to the city or other construction work. Today, Xiaobian compiled a PE pipe construction plan, hoping to help you

introduction

pe is polyethylene. Generally, the application range of PE pipe water supply pipeline is lower than 40 ℃, which cannot be used in hot water transmission pipeline. PE pipe is a kind of thermoplastic resin with high crystallinity and non polarity. The appearance of the original HDPE is milky white and translucent to a certain extent in the thin section. PE has excellent resistance to most domestic and industrial chemicals. Some kinds of chemicals will produce chemical corrosion, such as corrosive oxidants (concentrated nitric acid), aromatic hydrocarbons (xylene) and halogenated hydrocarbons (carbon tetrachloride)

plastic pipes in China are developing rapidly and their quality is constantly improving. At present, a plastic pipe industry dominated by polyvinyl chloride (PVC-U) pipes, polyethylene (PE) pipes and polypropylene (PP-R) pipes has initially formed. Among them, polyethylene (PE) pipe is widely used in building water supply, building drainage, buried drainage pipe, building heating, gas transmission and distribution, gas transmission pipe, electrical and Telecommunications protection sleeve, industrial pipe, agricultural pipe, etc. because of its unique advantages. It is mainly used in urban water supply, urban gas supply and farmland irrigation

pe pipeline construction scheme

I. preparation before construction

⑴ the construction unit shall have corresponding qualifications, and the engineering construction personnel shall have the installation technical qualification of this discipline

⑵ construction drawings and other relevant technical documents are complete and passed the joint review; And the design unit has conducted technical disclosure

⑶ the materials on the construction site meet the design requirements, and the construction equipment and site environment can ensure normal construction

II. Technical points of PE pipe hot melt welding (injection type socket connection, electric fusion socket connection, hot melt saddle welding connection) and butt welding (injection type, butt type)

⑴ pipe breaking shall be carried out according to the measured pipe length. Special pipe shears and cutters should be used for cutting tools, DN Ge; Mechanical cutting should be adopted for 40mm pipes. After cutting, the cross section of the pipe shall be flat and smooth without burrs, and the cross section shall be vertical to the pipe axis

⑵ on the hot-melt butt joint connecting tool, the two corresponding pieces to be connected should be straightened so that they are on the same axis, and the misalignment should not be greater than 10% of the wall thickness

III. quality acceptance

1. Intermediate acceptance after the installation of concealed pipelines, hydraulic or pneumatic tests shall be carried out by the construction unit in conjunction with the supervision unit

2. General acceptance general acceptance conditions:

(1) construction drawings, as built drawings and design change documents

(2) on site acceptance records of pipes, pipe fittings and quality assurance materials

IV. hydrostatic test and pneumatic test shall be carried out according to the following steps:

1. The pipeline shall be filled with water slowly from the downstream, and the exhaust valve shall be set at the top of the upstream pipe and the convex point in the pipeline

2. Carry out the hydrostatic test according to 1.5 times of the design working pressure, but the cold water pipe shall not be less than 0.6MPa, the pressure rise time shall not be less than 10min, and the pressure accuracy of the measuring instrument shall not be less than 0.01Mpa

safety measures:

1. Coordinate with the relevant departments of railway, highway and municipal administration before construction, and the construction can be carried out only after the construction scheme is approved by the relevant management departments. Especially when the construction is carried out under the railway subgrade, it is necessary to contact the railway department at any time to master the situation of passing trains. When there are trains passing on the line, it is strictly prohibited to dig and Jack in

2. During excavation and jacking, low-voltage portable lamp transformer shall be used for lighting in the tunnel, and open fire is not allowed in the tunnel

3. Stop digging during jacking, no one is allowed to stand on and on both sides of the dowel column, and all dowel columns must be placed smoothly and straightly

4. During hoisting, the personnel in the pit shall take protective measures and have special personnel to command

5. When PE pipe jacking is too long, air supply facilities should be set to prevent hypoxia

the above points are the relevant information of PE pipe construction scheme summarized by Xiaobian. I believe you will have a certain understanding after reading it. In this way, you will know a lot. If you still have those who want to know, you can go to our station to have a look

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