How to construct geomembrane

How to Construct Geomembrane

 

HDPE geomembrane construction and installation process:

 

HDPE GEOMEMBRANE LINER

 

hdpe geomembrane 15

 

Landfill geomembrane2

 

1. Cutting and transportation:

 

According to the measurement records of the laying base, cut out large bundles of geomembrane, record the numbers, and transport them to the laying site according to the numbers. Note that the geomembrane should not be dragged or pulled hard during transportation to avoid being stabbed by sharp objects.

 

2. Construction and installation of HDPE geomembrane

 

The upper and lower layers of the geomembrane are overlapped by 150mm of geotextiles

1) It should extend from the bottom to the high position, do not pull too tight, and leave a margin of 1.50% for local sinking and stretching. Taking into account the actual situation of the project, the slope is laid from top to bottom.

2) The longitudinal joints of two adjacent sheets should not be on a horizontal line, and should be staggered by more than 1000mm.

3) The longitudinal joint should be more than 1500 meters away from the bottom of the lake and the bent foot, and should be set on the plane.

4) First the slope and then the bottom of the lake.

5) When laying the slope, the direction of film spreading should be basically parallel to the maximum slope line.

Slope laying control: Before the anti-seepage geomembrane is laid on the slope, first check and measure the laying area, and transport the anti-seepage membrane matching the size in the warehouse to the site anchoring ditch platform according to the measured size. According to the actual conditions, a convenient way of "pushing the shop" from top to bottom is adopted. It should be cut reasonably in the fan-shaped area so that the upper and lower ends are firmly anchored.

Lake bottom laying control: Before laying the anti-seepage geomembrane, first check and measure the laying area, and transport the anti-seepage membrane matching the size in the warehouse to the corresponding position according to the measured size: When laying, manually press a certain direction , to perform a "push shop".

Alignment and alignment: The laying of HDPE geomembrane, whether it is a slope or a lake bottom, should be smooth and straight to avoid wrinkles and ripples, so as to align and align the two geomembranes. The lap width is generally about 100mm according to the design requirements.

Control of lamination: Use a sand bag to press the aligned and aligned HDPE geomembrane in time to prevent it from being pulled by the wind.

The laying control in the anchoring ditch: at the top of the anchoring ditch, a certain amount of anti-seepage membrane should be reserved according to the design requirements for local sinking and stretching.

Longitudinal seam: the uphill section is up, the downhill section is down, and there is enough lap length ≥150mm. When laying, artificially "push the pavement" in a certain direction, and when laying the slope, the HDPE geomembrane sand bag will be aligned in time, and the aligned direction of the film should be basically parallel to the maximum slope line.

 

3. Welding preparation: Experimental welding requirements:

 

1) Experimental welding was performed on HDPE geomembrane samples to inspect and adjust the welding equipment.

2) The welding equipment and welding personnel can only proceed to the next production welding after the successful completion of the experimental welding.

3) Frequency control of experimental welding: According to the change of ambient temperature, each machine shall be carried out no less than twice a day, once before the formal operation and once in the middle shift.

4) Pilot welding is performed under the same surface and environmental conditions as production welding.

 

4. Production welding

 

1) Production welding can only be carried out by means of pilot welding.

2) Adjust the welding machine to the best parameters when welding through the experimental weldability, and automatically weld under the condition of the lap width required by the design, and the welding seam is "flat, firm and beautiful".

3) The manual welding machine is only suitable for repairing and repairing with a welding torch where the double seam welding machine cannot be operated.

 

5. Control of welding data

 

1) Whether it is production welding or experimental welding, the welding temperature, speed and pressure of the clamping stick must be maintained to achieve the best welding effect.

2) Each weld shall be inspected

 

6. Welding quality assurance control measures

 

1) When welding a slope, the length of the weld should extend along the slope and cannot cross.

2) Minimize the welding of side feet and sporadic films.

3) There should be a welding supervisor to supervise the welding operation.

4) The surface of HDPE geomembrane should be cleaned of grease, moisture, dust, garbage and other debris.

5) If welding is operated at night, there should be sufficient lighting.

6) At the lap joint of HDPE geomembrane, the wrinkles should be removed. When the size of the wrinkles is less than 100mm, a circular or oval patch should be used, and the size of the patch should exceed the perimeter of the incision by 100mm.

7) When the ambient temperature and unfavorable weather conditions seriously affect the welding of HDPE geomembrane, the operation should be stopped.

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