Installation and construction method of geotextile (the most comprehensive and strictest)
Storage, transportation and processing of geotextile
The geotextile roll should be protected from damage before installation and unfolding. Geotextile rolls should be stacked in a flat place with no water, and the height of the stack should not exceed the height of four rolls, and the identification film of the roll can be seen. Geotextile rolls must be covered with opaque materials to prevent UV aging. During the storage process, the integrity of the label and the integrity of the data should be maintained. During transportation (including on-site transportation from the material storage site to the work site), the geotextile roll must be protected from damage. Geotextile rolls that have been physically damaged must be repaired. Geotextiles that are severely worn cannot be used. Any geotextile in contact with leaking chemical reagents is not allowed to be used in this project.
Use manual rolling; the cloth surface should be flat, with proper allowance for deformation.
Geotextile stitching: all stitching must be performed continuously (for example, spot stitching is not allowed). Before overlapping, the geotextile must overlap at least 150mm. The minimum stitch distance from the selvedge (the exposed edge of the material) is at least 25mm. The seams of the sewn geotextile include the one-line and chain stitch method. The thread used for stitching should be a resin material with a minimum tension of more than 60N, and have chemical resistance and UV resistance equivalent to or exceeding that of geotextile. Any “drop stitches” on the sewn geotextile must be re-sewn in the affected area. Corresponding measures must be taken to prevent soil, particulate matter or foreign matter from entering the geotextile layer after installation. The cloth overlap can be divided into natural overlap, seam or welding according to the terrain and usage function.
Basic requirements for laying geotextile
① The joint must intersect the slope line; where it is balanced with the slope foot or where stress may exist, the distance between the horizontal joint must be greater than 1.5m.
② On the slope surface, anchor one end of the geotextile, and then put down the coiled material on the slope surface to ensure that the geotextile remains in a tight state.
③ All geotextiles must be pressed with sand bags. The sand bags will be used during laying and will be retained until the layer of material on top of laying.
Geotextile laying process requirements
Self-inspection and repair of geotextile construction
① All geotextile pieces and seams must be checked. Defective geotextile pieces and stitches must be clearly marked on the geotextile and repaired.
② The worn geotextile must be repaired by laying and thermally connecting small pieces of geotextile. The small pieces of geotextile must be at least 200mm longer than the edge of the defect in all directions. The thermal connection must be strictly controlled to ensure that the geotextile patch and the geotextile are tightly combined, and there is no damage to the geotextile.
③ Before the end of every day of laying, visually inspect the surface of all the geotextiles laid that day to confirm that all damaged places have been marked and repaired immediately, and make sure that the laying surface is free of foreign substances that may cause damage, such as fine needles and small iron nails. Etc., foreign substances that may cause damage, such as fine needles, small iron nails, etc.
④ The patch material used to fill holes or cracks should be the same as the geotextile.
⑤ The patch should extend at least 30 cm beyond the damaged geotextile.
⑥ At the bottom of the landfill, if the crack of the geotextile exceeds 10% of the width of the coil, the damaged part must be cut off, and then the two geotextiles must be connected; if the crack exceeds 10% of the width of the coil on the slope, the The roll of geotextile was removed and replaced with a new roll.
⑦ The work shoes worn by the construction personnel and the construction equipment used should not damage the geotextile, and the construction personnel shall not do things that may damage the geotextile on the laid geotextile, such as smoking or poking the geotextile with a sharp tool.
⑧ For the safety of geotextile materials, the packaging film should be opened before laying the geotextile, that is, one roll is laid and one roll is opened. And inspect the appearance quality.
Precautions for installation and construction of geotextile
① Geotextile can only be cut with a geotextile knife (hook knife). If cutting in the field, special protective measures must be taken for other materials to prevent unnecessary damage to the geotextile due to cutting;
② When laying geotextiles, care must be taken not to let stones, a large amount of dust or moisture, etc., which may damage the geotextiles, block drains or filters, or may cause difficulties for subsequent connections, enter the geotextiles or Under the geotextile;
③ After installation, visually inspect the surface of all geotextiles to identify all damaged landlords, mark and repair them, and make sure that there is no foreign matter that can cause damage to the paving surface, such as broken needles and other foreign objects.
④ The connection of geotextile must follow the following regulations: Under normal circumstances, there can be no horizontal connection on the slope surface (the connection must be along the contour of the slope surface and not intersect with it), except for the repaired place.
⑤ If stitching is used, the stitching thread must be made of the same material as or exceeding the material of the geotextile, and the stitching thread must be made of chemical-resistant and UV-resistant material. There should be obvious color difference between the suture thread and the geotextile for easy inspection.
⑥ Pay special attention to stitching during installation to ensure that no gravel in the soil or gravel covering layer enters the middle of the geotextile.
Damage and repair of geotextile
- At the suture joint, re-suturing repair must be performed, and the end of the skipped stitch part must be re-sutured.
- In all areas, except for rocky slopes, loopholes or torn parts must be repaired and sutured with geotextile patches of the same material.
- At the bottom of the landfill, if the length of the crack exceeds 10% of the width of the coil, the damaged part must be cut off, and then the two parts of geotextile are connected.
For more information please contact to Geofantex Geosynthetics Co., Ltd.
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