Short fiber geotextile is mostly used in highway maintenance and composite membrane production, also has good water permeability, and is also used in blind ditch construction.
If you need other specifications, please note in the remarks.
Geotextile rolls must be protected from damage before installation and unfolding. Geotextile rolls should be stacked on a flat, water-free place, the stacking height should not exceed the height of four rolls, and the roll identification sheets should be visible. Geotextile rolls must be covered with opaque materials to prevent UV aging. During storage, keep the labels and materials intact.
During transportation (including transportation from the material storage site to the work site on site), geotextile rolls must be protected from damage.
Physically damaged geotextile rolls must be repaired. Severely worn geotextile cannot be used. Any geotextile that has come into contact with leaked chemical reagents is not allowed to be used in this project.
Geotextile laying methods:
1. Manual rolling, the cloth surface should be flat, and appropriate deformation allowance should be left.
2. The installation of filament or short fiber geotextile usually uses several methods: lap joint, sewing and welding. The width of sewing and welding is generally more than 0.1m, and the lap width is generally more than 0.2m. For geotextile that may be exposed for a long time, it should be welded or sewn.
3. Geotextile sewing:
All sewing must be continuous (for example, point sewing is not allowed). Before overlapping, geotextile must overlap by at least 150mm. The minimum stitch distance from the woven edge (exposed edge of material) is at least 25mm.
The sewn geotextile joint should include at least 1 row of thread-locked chain stitch. The thread used for sewing should be resin material with minimum tension exceeding 60N, and have chemical corrosion resistance and UV resistance equivalent to or exceeding that of geotextile.
Any "missed stitches" on the sewn geotextile must be re-stitched at the affected area.
Corresponding measures must be taken to prevent soil, particulate matter or foreign matter from entering the geotextile layer after installation.
The lap joint of cloth can be divided into natural lap joint, sewn joint or welded joint according to terrain and use function.
4. During construction, the geotextile above the geomembrane adopts natural lap joint, and the geotextile on the upper layer of geomembrane adopts sewn joint or hot air welding. Hot air welding is the preferred connection method for filament geotextile, that is, use a hot air gun to instantly heat the connection of two pieces of cloth at high temperature, so that part of it reaches a molten state, and immediately use a certain external force to make it firmly bonded together. When hot-melt bonding cannot be performed in humid (rain and snow) weather, geotextile should adopt another method - sewn connection method, that is, use a special sewing machine for double-thread sewn connection, and use chemical UV-resistant suture.
The minimum width for sewing is 10cm, the minimum width for natural lap joint is 20cm, and the minimum width for hot air welding is 20cm.
5. For sewn joints, use suture with the same quality as geotextile, and the suture should be made of material with stronger resistance to chemical damage and ultraviolet radiation.
6. After the geotextile is laid and approved by the on-site supervising engineer, lay the geomembrane.
7. The geotextile on the geomembrane is laid in the same way after the geomembrane is approved by Party A and the supervisor.
8. The corresponding numbers of each layer of geotextile are TN and BN.
9. The upper and lower layers of geotextile of the membrane should be buried into the anchoring trench together with the geomembrane at the parts with anchoring trenches.
Basic requirements for geotextile laying:
1. The joint must intersect the slope line; where it is balanced with the slope toe or there may be stress, the distance of the horizontal joint must be greater than 1.5m.
2. On the slope surface, anchor one end of the geotextile, then unroll the roll down the slope to ensure the geotextile remains in a taut state.
3. All geotextiles must be pressed down with sandbags, which will be used during laying and retained until the upper layer of material is laid.
Geotextile laying process requirements:
1. Base inspection: Check whether the base is flat and solid. If there is foreign matter, it should be properly handled beforehand.
2. Trial laying: According to site conditions, determine the geotextile size, cut and then trial lay, the cutting size should be accurate.
3. Check whether the pulling width is appropriate, the lap joint should be flat, and the tightness should be moderate.
4. Positioning: Use a hot air gun to bond the lap parts of two geotextiles, the spacing of bonding points should be appropriate.
5. When sewing the lap parts, the suture should be straight and the stitches should be uniform.
6. After sewing, check whether the geotextile is laid flat and whether there are defects.
7. If there are phenomena that do not meet the requirements, repair them in time.
Self-inspection and repair:
a. All geotextile pieces and seams must be inspected. Defective geotextile pieces and seams must be clearly marked on the geotextile and repaired.
b. Worn geotextile must be repaired by laying and heat-connecting small geotextile pieces. The geotextile pieces should be at least 200mm longer than the edge of the defect in all directions. Heat connection must be strictly controlled to ensure the geotextile patch and geotextile are tightly bonded, and there is no damage to the geotextile.
c. Before the end of daily laying, visually inspect the surface of all geotextiles laid that day to ensure all damaged areas have been marked and repaired immediately, and ensure there is no foreign matter on the laying surface that may cause damage, such as fine needles, small iron nails, etc.
d. The following technical requirements should be met when repairing damaged geotextile:
e. The patch material used to fill holes or cracks should be consistent with the geotextile.
f. The patch should extend at least 30 cm beyond the damaged geotextile area.
g. At the bottom of the landfill, if the geotextile crack exceeds 10% of the roll width, the damaged part must be cut off, and then the two geotextiles connected; if on the slope surface, the crack exceeds 10% of the roll width, the roll of geotextile must be removed and replaced with a new roll.
h. The work shoes worn by construction personnel and the construction tools used should not damage the geotextile. Construction personnel must not do things that may harm the geotextile on the laid geotextile, such as smoking or poking the geotextile with sharp tools.
i. For the safety of geotextile materials, the packaging film should be opened before laying the geotextile, that is, lay one roll, open one roll. And inspect the appearance quality.
j. Special mention: After the geotextile arrives at the site, it must be accepted and visa-recognized in a timely manner.
The company's "Geotextile Construction and Acceptance Regulations" must be strictly implemented.
Precautions for geotextile installation and construction:
1. Geotextile can only be cut with a geotextile knife (hook knife). If cutting in the site, special protection measures must be taken for other materials to prevent unnecessary damage caused by cutting geotextile;
2. While laying geotextile, all necessary measures must be taken to prevent damage to the lower layer of material;
3. When laying geotextile, care must be taken not to let stones, a lot of dust or moisture, which may damage the geotextile, may block drainage channels or filter nets, or may bring difficulties to subsequent connections, enter the geotextile or below the geotextile;
4. After installation, visually inspect all geotextile surfaces to determine all damaged areas, mark and repair them, and ensure there is no foreign matter on the laying surface that can cause damage, such as broken needles and other foreign objects;
5. The connection of geotextile must follow the following provisions: under normal circumstances, there should be no horizontal connections on the slope surface (connections must follow the contour of the slope surface without intersecting it), except for repair areas.
6. If sewing is used, the suture must be made of material the same as or exceeding the geotextile material, and the suture must be chemical UV-resistant material. The suture and geotextile should have obvious color difference for easy inspection.
7. Pay special attention to sewing during installation to ensure that no soil or gravel in the gravel cover layer enters between the geotextiles.
Damage and repair of geotextile:
1. At the sewn joint, re-sewing and repair must be performed, and ensure the end of the skipped stitch part has been re-stitched.
2. In all areas, except for rock slope sections, holes or torn parts must be repaired and sewn with geotextile patches of the same material.
3. At the bottom of the landfill, if the length of the crack exceeds 10% of the roll width, the damaged part must be cut off, and then the two parts of geotextile are connected.
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