The key points of non-destructive inspection include air pumping method, vacuum pump method and electric spark method, in which the air pumping method is applicable to the inspection of hot-melt double welding; true Air pump method and electric spark method are applicable to the inspection of single welding of extrusion arc welding..
Start the air pump, input high-pressure gas up to 250kPa, and stop pressurization.
Within 7 minutes If the reading of the internal pressure gauge drops by more than 240kpa, it indicates that the weld needs repair welding or rework.
Extrusion welding; HDPE geomembrane block welding joint The stitches shall overlap by 7.5cm.
The hot gas device can only be used for heating and bonding the plastic film module.
The scientific research on the theory, practice and application of composite geomembrane is at the present stage It is still in the initial stage, so it is generally used in low and medium earth rockfill dams, and it is rarely used in high earth rockfill dams.
The geomembrane manufacturer shall implement the anti-seepage construction standard to avoid the loss caused by the weather as far as possible.
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There are also carbon black, anti-aging agents, antioxidants, ultraviolet absorbers, geomembrane data quality indicators, and on-site welding technology can be improved.
Testing method: seal both ends of the whole weld cavity of geomembrane to be tested After the equipment is connected, insert the special hollow needle into one end of the cavity.
Geomembrane welding inspection: after the joint is welded on the spot, the supervising enterprise shall be invited to carry out inspection immediately.
The electrode must be kept clean and dry.
Therefore, if it is laid in cold weather, the anti-seepage membrane shall be tightened.
It has excellent resistance to environmental stress cracking and excellent chemical resistance, and has large operating temperature range and long-term application life.
Meet the requirements of anti-seepage, stabilizer and other accessories, the service time of geomembrane supplier, and develop the excavated geomembrane consumption equipment.
Be careful not to damage the geomembrane, and the polishing shall not damage the HDPE geomembrane.
Therefore, scientific research on system software has been carried out for many problems of composite geomembrane impervious core in the application of high earth rockfill dams, and relative scientific research results have been obtained.
Before sewing, the stitching area must be cleaned to ensure that the area is clean without water, dust, garbage or any debris.
Because the construction takes a few days, the weather will change.
Open the other end of the cavity and observe the decline process of the reading of the pressure gauge.
The gas in the cavity disappears, indicating that the cavity of the geomembrane is through and the whole weld passes the inspection.
Within 7 minutes, the reading of the pressure gauge does not drop or drop no more than 240kpa.
The inspection and inspection can be divided into non-destructive inspection and destructive inspection.
