- Geotextile storage, transportation and handling
Geotextile rolls should be protected from damage before installation and deployment. Geotextile rolls should be stacked in a place where there is no water, the height of the pile should not exceed four rolls, and the identification page of the volume can be seen. Geotextile rolls must be covered with opaque material to prevent UV aging. The integrity of labels and data must be maintained during stored procedures. Geotextile rolls must be protected from damage during transport, including from the material storage site to the work site. Geotextile rolls that have been physically damaged must be repaired. Do not use geotextiles with severe wear. Any geotextiles that have been exposed to leaked chemical agents may not be used in this project.
- Geotextile laying method
2.1 Use manual rolling; The surface of the cloth should be smooth, and there should be an appropriate deformation margin.
2.2 Stitching of geotextiles: All stitching must be carried out continuously (for example, point stitching is not allowed). The geotextile must overlap at least 150mm before overlapping. The minimum stitch distance from the cloth edge (the exposed edge of the material) is at least 25 mm. Most of the stitched geotextile seams include a single line seam chain stitching method. The thread used for stitching shall be a resin material with a minimum tension greater than 60N, and its chemical resistance and UV resistance linearity shall equal or exceed that of geotextiles. Any “missing stitches” in the stitched geotextile must be restitched in the affected area. Proper measures must be taken after installation to prevent soil, particulate matter or foreign matter from entering the geotextile layer. Cloth circles can be divided into natural circles,
- Basic requirements for laying geotextiles
3.1 The joint must intersect the diagonal line; At the point of balance with the foot of the slope or where stress may exist, the distance of the horizontal seam must be greater than 1.5m.
3.2 On the slope, anchor one end of the geotextile and then place the crimped material on the slope to ensure that the geotextile remains tight.
3.3 All geotextiles must be sandbagged. Sandbags will be used during the laying process and will remain in place until the layer above the material is laid.
- Geotextile laying process requirements
4.1 Base inspection: Check whether the base is smooth and firm. If there are foreign objects, dispose of them properly.
4.2 Test laying: Determine the geotextile size according to the site conditions, and then test laying after cutting, and the cutting size should be accurate.
4.3 Check that the width of the salad is appropriate and that the seams should be flat and firm.
4.4 Positioning: Use a heat gun to glue the overlapping parts of the two geotextiles together. The distance between the joints should be appropriate.
4.5 When sewing overlapping parts, the stitches should be straight and flat.
4.6 After stitching, check whether the geotextile is flat and has defects.
4.7 If there is dissatisfaction, it should be repaired in time.
- Self-check and repair
5.1 All geotextiles and seams must be inspected. Defective geotextiles and stitches must be clearly marked and repaired.
5.2 Worn geotextiles must be repaired by laying and hot joining small geotextiles that should be at least 200 mm longer than the defect edge in all directions. The thermal connection must be strictly controlled to ensure that the geotextile patch and geotextile are tightly bonded and will not damage the geotextile.
5.3 Before laying each day, visually inspect the surface of all geotextiles laid on that day to ensure that all damaged areas have been marked and repaired immediately to ensure that the laying surface is free of foreign objects that may cause damage (e.g. fine needles) Nails and small nails and other foreign objects that may cause damage, such as fine needles, small nails, etc.
5.4 The repair material used to repair holes or cracks shall be consistent with the geotextile.
5.5 The patch shall extend to the damaged geotextile at least 30 cm.
5.6 At the bottom of the landfill, if the cracks in the geotextile exceed 10% of the width of the coil, the damaged part must be cut and the two geotextiles joined; If the crack exceeds 10% of the coil width on the slope, the geotextile coil is removed and replaced with a new coil.
5.7 The work shoes worn by the construction personnel and the construction equipment used should not damage the geotextile. The construction worker shall not do anything on the laid geotextile that may damage the geotextile, such as smoking or poking the geotextile with a sharp tool.
5.8 For the safety of geotechnical materials, the packaging film should be opened before laying geotextiles, that is, laying one roll and opening one roll. And check the appearance quality.
- Geotextile installation and construction precautions
6.1 Geotextile can only be cut with geotextile knife (hook knife). If cutting on site, special protective measures must be taken for other materials to prevent unnecessary damage to geotextiles due to cutting;
6.2 When laying geotextiles, care must be taken not to let stones, a large amount of dust or moisture damage geotextiles, block drainage pipes or filters or cause substances, which may cause difficulties in subsequent connection geotextiles or underground geotextiles;
6.3 After installation, visually inspect the surfaces of all geotextiles to identify all damaged landlords, mark and repair them, and ensure that there are no foreign objects on the laid surface, such as broken needles and other foreign objects, which can cause damage.
6.4 The connection of geotextiles must comply with the following requirements: under normal circumstances, there shall be no horizontal connection on the slope (the connection shall not intersect the slope contour) except at the maintenance site.
6.5 If sutures are used, the sutures must be made of the same or more geotextile material and the sutures must be made of chemically resistant ultraviolet light. There should be a clear color difference between the suture and the geotextile to facilitate inspection.
6.7 Special attention should be paid to stitching during installation to ensure that neither gravel nor gravel cover in the soil gets into the geotextile.
- Damage and maintenance of geotextiles
7.1 When sewing, it must be re-sewn and repaired, and ensure that the end of the jump seam has been sewn.
7.2 In all areas except rocky slopes, holes or cracks must be repaired and sewn with geotextiles of the same material.
7.3 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 and then the two parts of the geotextile must be joined.