Things that should be paid attention to when laying geotextiles on the highway

Highway geotextiles before laying, first. Leveling of working surface. Generally, we should pay attention to the following points:

The joint shall intersect the slope line;

Where there is a balance with the foot of the slope or where there may be stress, the distance between the horizontal joints shall be greater than 1.5m;

On the slope, one end of the geotextile is anchored, and then the coil is lowered to the slope. Geotextile is kept in a tensioned state;

All geotextiles shall be held down with sand bags which will be used during laying and retained until laying the top layer of material.

The highway laying method is as follows:

1. Roll by hand; Cloth surface should be flat, and appropriate deformation allowance. The installation of long filament or short filament geotextile is usually done by lapping, stitching and welding. The width of suture and welding is generally more than 0.1m, and the width of lap is generally more than 0.2M. Geotextiles that may be exposed for a long time should be welded or stitched.

2. Geotextile stitching: All stitching should be done continuously (for example, spot stitching is not allowed). The geotextile must overlap more than 150mm before overlapping. The distance of small stitches from the woven edge (the exposed edge of the material) should be at least 25mm; The stitched geotextile joints include 1 row chain stitch with wired lock. The thread used for stitching should be of low tension. A resinous material over 60N, and having a geotextile equivalent or equivalent. Chemical corrosion resistance and light resistance. Appropriate measures shall be taken to avoid the entry of soil, particulate matter or foreign matter into the geotextile layer after installation.

3. In the construction, the vertical side of geotextile natural lapping, in wet (rain and snow) weather can not be thermal adhesive connection, geotextile should take another method of suture connection method, that is, special sewing machine for double suture connection, and the use of chemical UV resistant suture line.

The small width was 10cm for suture and 20cm for natural lap.

4. For stitching, the quality of sutures should be the same as that of geotextile, and the sutures should be made of materials with stronger resistance to chemical damage and ultraviolet irradiation.

5. Geomembrane shall be laid after the completion of geotextile laying and approved by the site supervision engineer.