Construction shall not be carried out when there is ponding or rain, and the bentonite pad laid on the same day must be covered with backfill
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3) During laying, it shall be tensioned manually without wrinkles and close to the lower bearing layer
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The backfill shall be divided into coarse sand, gravel and concrete stone layers
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2) Check the appearance of impervious geomembrane, record and repair defects such as damage and holes; 3) Make a test section and determine the construction process parameters such as welding temperature and speed
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The anti-seepage geomembrane is welded with a double track welding machine
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Construction scheme of impervious membrane (geomembrane) I
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It is qualified if the vacuum pressure is greater than or equal to 0.005MPa and maintained for 30s, and the soap solution does not bubble 3) Indoor test
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2
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3、 Construction process Base course treatment – laying of geosynthetics – overlapping treatment – Inspection and acceptance – backfilling IV Construction method 1
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5) The sealing and water stop of underwater pipe orifice shall be sealed with GB rubber waterstop, wrapped with metal and treated with anti-corrosion treatment
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3
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During backfilling, the backfilling speed shall be controlled according to the design requirements and foundation settlement.
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Preparation before laying: 1) Blanking analysis and reasonable cutting
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It has a large service temperature range and long service life
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The back dump truck is generally used for backfilling, and the compaction density shall be determined by the design before the vehicle can carry out backfilling
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6) After the anti-seepage geomembrane is laid, it shall be pressed with sand bags to prevent wind and sand from affecting the construction operation
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is located in Lingcheng district (formerly Lingxian county) Economic Development Zone, Dezhou City, Shandong Province, which is known as Jiuda Tianqu; Sales Hotline: 13853463799 Specializing in the production of polyester long (short) silk non-woven fabric, geomembrane, impervious membrane, composite geomembrane, impervious geotextile, sodium bentonite waterproof blanket, drainage network, drainage board, planting bag, ecological bag, grass proof cloth, soft permeable pipe and geosynthetics
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3
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Fold the edge of HDPE impervious membrane U-shape in the trench and fix it with stones, backfill or cement
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The surface connected with the PE film is heated by thermal welding method to melt the surface, and then it is melted into one by pressure
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The surplus at each end shall not be less than 1000mm and shall be fixed according to the design requirements
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2
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It is qualified if there is no obvious drop in pressure 2) 50cm shall be adopted for single weld, T-shaped node and repair point × Vacuum test shall be carried out on a 50cm square
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3
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Main labor force required for each construction technician: 1 mechanic (responsible for lifting composite geomembrane), 1 paying off worker, 1 electrician and 5-6 auxiliary general workers (which can be adjusted according to the project progress)
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2) The paving surface of geomembrane shall be cleaned without sharp objects, stones, iron wires, wooden rods, etc
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2) For the base course that is not suitable for direct laying of anti-seepage geomembrane, a sand cushion shall be set first
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2
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VI
3) Repair method for damaged parts: cut materials with the same specifications, hot melt repair or seal with special geomembrane glue
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2
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4) For the connection of non-woven fabric at the weld bead, if the composite geotextile on both sides of the membrane is less than 150g / ㎡, it can be welded with hot-air welding gun, and more than 150g / ㎡ can be sewn with portable sewing machine
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The thickness of the sand cushion shall not be less than 300 mm, and it is suitable to use medium Coarse sand, mud content not more than 5%
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The thickness of each layer of backfill shall be determined with the depth of backfill and the selected compaction mechanical properties
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The base surface shall be dry (moisture content shall be controlled below 15%) and compacted (dense and uniform, compaction coefficient ≥ 0.95)
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The width, thickness and specifications are complete
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The flatness in the membrane shall change smoothly, and the internal and external corners shall be smooth
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More than 70000 people followed us Add wechat to learn more 24-hour after-sales service sales hotline: 13853463799 Geotechnical material manufacturer (same as wechat) Dezhou Huaxiang new material technology Co., Ltd
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7) For the laid geomembrane, the edge joints shall be free of oil, water, dust, etc
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4) Before paving the impervious geomembrane, use the road roller to statically close the surface on both sides
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Anchoring of HDPE impervious membrane: （ 1） There are three anchorage methods: trench excavation anchorage, nail gun with gasket anchorage and expansion bolt anchorage; Cement embedded anchorage will also be used in some fields
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4) When the geomembrane is laid, there must be surplus at both ends
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Weld quality requirements: 1) The inflation length of double seam is 30-60mm, and the inflation pressure between double welds reaches 0.15-0.2mpa and remains for 1-5min
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The surface shall be flat, free of cracks, mud and depression, and the slope shall be uniform
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2) Hot melt welding working temperature 280 ~ 300 ℃; Travel speed 2 ~ 3m / min; The welding form is double rail welding
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Geomembrane is a kind of waterproof and barrier material based on high polymer
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It is mainly divided into low density polyethylene (LDPE) geomembrane, high density polyethylene (HDPE) geomembrane and EVA geomembrane
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5) Both sides of the impervious geomembrane shall reserve a certain width of non adhesive layer between PE film and PET fabric (i.e
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Laying of impervious geomembrane materials 1) First, check the material for damage
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The detection method shall be inflation method and indoor test, or spark test or ultrasonic detection method 2
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The tensile strength of welding shall be greater than that of base metal 4) Quality inspection shall be carried out with the construction progress
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Remove tree roots, grass roots and hard objects to avoid damage to geomembrane
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2) The anti-seepage geomembrane shall be laid according to its main stress direction, and shall not be pulled too tightly
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Base course treatment 1) The base course for laying anti-seepage geomembrane shall be flat, and the local height difference shall not be greater than 50mm
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backfilling 1
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1) Lap width of weld bead: 80 ~ 100mm; The natural folds of plane and vertical planes are 5% ~ 8% respectively; Reserved expansion: 3% ~ 5%; Leftover material: 2% ~ 5%
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Pressure detector and vacuum detector are used as testing equipment 3
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edge throwing)
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material selection and engineering practice 1
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Base preparation: 1) Check and confirm that the foundation support layer has the conditions for laying geomembrane
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It is used in anti-seepage and isolation infrastructure projects such as landfill, tailings storage yard, Canal Anti-seepage, dam anti-seepage and subway anti-seepage
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Excellent chemical corrosion resistance
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4
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（ 2) Depending on the service conditions and stress conditions of HDPE geomembrane, the width of its anchorage groove is generally 0.4m-1.0m and its depth is 0.6m-1.2m
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During laying, the direction of geomembrane of each unit shall be adjusted to facilitate the welding of composite geomembrane of two units
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It shall be compacted in time with paving to avoid being lifted by the wind
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3
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The thickness of the first layer of coarse sand fill shall not be less than 20cm, the thickness of the second layer of gravel shall not be less than 30cm, and the thickness of the third layer of concrete stone or block stone shall not be less than 30cm
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For backfilling, the soil shall be unloaded from both sides of geosynthetics, and the construction and backfilling plane shall always be in a “concave” shape (the notch faces the access direction)
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5
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A certain amount of expansion shall be reserved to adapt to the deformation of the matrix.
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5、 Welding quality inspection: 1
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2、 Construction conditions 1
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The overlapping width is generally 6 ~ 8cm and flat without white wrinkles
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8) Before welding, adjust the two sides of PE single film at the joint to make it overlap with a certain width
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Material preparation: the performance index of the purchased impervious geomembrane meets the technical standard of geomembrane: GB / t17643-2011, which has specific parameter requirements for various specifications of impervious geomembrane
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the turf and tree roots within the anti-seepage range shall be removed, and the weed shall be sprayed with herbicide
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Geomembrane with thickness greater than or equal to 0.8mm can also be called waterproof board! 1
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It has excellent environmental stress cracking resistance and excellent chemical corrosion resistance
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