Polyethylene (PE) pipeline quality problems often occur in engineering construction, resulting in water leakage phenomenon of the causes are more complex, including thermal fusion joints connection is not stable, filling soil is not standardized, bracket and pipe clamp installation is not uniform and so on many aspects. For these problems, you can take mechanical connection, hoop connection and electrofusion connection and other ways to repair.
PE pipeline in the construction of water leakage problems often occur, the causes are diverse and complex, mainly including the following aspects:
1. Unstable connection of hot melt joints: During the connection of hot melt joints, the operating procedures are not strictly adhered to, and the three parameters of temperature, pressure and time are not well controlled, resulting in unstable connection quality.
2. Unstandardized filling: the directly buried pipeline is not filled with sand and backfill according to the specification requirements, and the quality of covering soil is not controlled, resulting in leakage of the interface.
3. Uneven installation of brackets and pipe cards: uneven installation of pipe brackets and pipe cards laid in the pipe trench, some pipe bolts are not tightly fixed, and uneven decomposition of longitudinal retraction caused by seasonal temperature difference, resulting in uneven stress in the pipeline pulling apart the thermal fusion joints.
4. Uneven compaction leads to burst: in order to meet the deadline, pipe laying in the uncompacted fill, uneven settlement leads to deformation of the pipe wall, so that the pressure inside the pipe is not uniform, which in turn caused the burst pipe.
5. soil relaxation and longitudinal retraction rate: pipeline interface is located in suburban farmland or near the creek, the soil after excavation, soil is loose, backfill is not compacted according to the requirements, while the longitudinal retraction rate of the pipe characteristics are not taken into account, longitudinal contraction caused by the length of the displacement of the deformation of the large, easy to burst pipe.
6. poor control of the construction site: the site temperature, humidity, dust and other conditions are difficult to control, material purchases purchased lower quality products, leaving hidden dangers to long-term safe operation.
How to find PE pipe leakage
There are many kinds of water leakage detection methods, for example, there are regional installed meter method, listening to the sound method, acoustic vibration method, infrared method, tracer element method, the relevant signal detection and buried medium change detection method. Any kind of detection method is essentially to detect the leakage triggered by some kind of effect, corresponding to the more obvious effect of the detection of the more simple. Currently widely used application methods for listening to the sound method, acoustic vibration method.
When the water supply pipeline leakage, water under pressure to escape will produce a noise, this noise will spread along the pipeline to both sides, or along the medium spread to the ground, pipeline leak detector is through the pickup of this leakage sound, and converted to electrical signals, after the corresponding amplification and digital filtering to determine the exact location of the leakage point. This is the traditional acoustic detection method for water leakage detection. In the area of 2m in diameter, the exact location can be determined directly by listening to the leak tube. The sound heard is the clattering sound of water flowing out of the ruptured pipe.
In order to solve the problem of PE pipe leakage, the following methods can be taken:
1. Mechanical connection: for pressure pipes and breakage without expansion, you can use PE special repair fittings, the leakage part of the hold, followed by tightening the connecting bolts, and plug the overflow holes in the upper part of the fittings, and finally fill in the good can be.
2. hoop connection: for pipe diameter less than 110mm, can only repair the structural integrity of the pipe. For round holes, scratches or larger size holes, but less than one-third of the diameter of the pipe, you can use the hoop connection repair.
3. Electrofusion connection: suitable for water breakage and broken parts of the surrounding dry situation, broken area can not be larger than the saddle blocking electrofusion area. Can use electrofusion saddle plugging fittings for connection, through electrofusion plugging repair leakage parts.
It should be noted that, when repairing, the appropriate repair should be chosen.
