Construction method of waterproof blanket

Bentonite waterproof blanket is a geosynthetic material specially used for artificial lake water features, landfills, underground garages, roof gardens, pools, oil depots and chemical yards, etc.

Bentonite waterproof blanket is a geosynthetic material specially used for artificial lake water features, landfills, underground garages, roof gardens, pools, oil depots and chemical yards, etc. to prevent seepage, which is filled with highly expansive sodium bentonite in the special composite geotextile and non-woven fabrics, needle-punched method of bentonite seepage control pads can be formed into a number of small fiber space, bentonite particles can not be flowed in one direction, when water is formed within the pad, a uniform high-density gel-like waterproof layer to effectively prevent water leakage. In case of water in the pad to form a uniform high-density gel-like waterproof layer, effectively preventing water seepage. Waterproofing blanket waterproofing mechanism is: bentonite waterproofing blanket selected sodium-based particles of bentonite can swell more than 24 times in contact with water, so that the formation of uniform viscous high and low filtration loss of colloidal system, in the two layers of geotextile restriction, so that bentonite from the disorder into an orderly expansion of the results of the continuous expansion of water absorption is to make the bentonite layer itself to achieve dense, thus having a waterproof effect.

Bentonite waterproofing blanket construction method:

1, bentonite waterproofing blanket material self-weight is large, it is appropriate to use a shovel with waterproofing blanket lifting tools to carry, laying. Waterproof blanket foundation treatment before construction, grass-roots level can be divided into soft base and hard base. Before laying GCL should use the necessary equipment to level the grass-roots level tamping, compaction of more than 85%, the surface should be flat and smooth, there can be no protrusion of more than 2cm of rocks and other objects, there can be no obvious hollow. The surface should be basically dry, there can be no obvious accumulation of water, if there is accumulation of water to carry out drainage operations. The base layer, the sunny corner repair radius should not be less than 30cm. if the repair radius is more than 40cm, or even vertical, after anchoring around the perimeter, take measures to fix it, without destroying the waterproofing pad under the premise of ensuring compaction. There are through the pipe, must be fixed treatment, reinforced with concrete, so that it can not shake. The anchoring ditch must be dug and compacted as required.

2, GCL laying before the preparatory work: 1) do the material analysis, drawing bentonite composite waterproofing mat (GCL) laying order and cutting diagram. (Auxiliary tools are well prepared) 2) check the appearance of bentonite composite waterproofing mat (GCL) quality, record and repair has been found mechanical damage and production trauma, voids and other defects. Bentonite waterproofing blanket material connection using lap joints.

3, bentonite waterproofing blanket in more than 10% of the slope should be laid to minimize the number of laps along the long direction of the slope, the slope of the bentonite mat must exceed the foot of the slope line more than 1500mm.

4, used to lay bentonite waterproofing blanket of any equipment can not be paved in the geosynthetics above driving. Installation of bentonite waterproofing blanket, outdoor air temperature can not be lower than 0 ℃ or higher than 40 ℃.

5, all exposed edges of the bentonite waterproofing blanket must be immediately pressed with sandbags or other heavy objects to prevent the bentonite waterproofing blanket by the wind or be pulled out of the perimeter of the anchoring ditch. Bentonite waterproofing blanket can not be unfolded in windy weather conditions to prevent being blown up by the wind. Surface and slope laying bentonite composite waterproofing blanket (pad) GCL, in order to avoid its sliding, available pins and shims to fix it, in addition to the overlap in the waterproofing pad and the edge of the parts with steel nails, the whole waterproofing pad in the middle of the need to depending on the flatness of the additional nails, and make sure that waterproofing pad firmly installed in the wall and the ground, nail holes can be made depending on the need to deal with the direction of the pad length (bentonite composite waterproofing pad when construction) Along the inclined plane parallel to the direction of laying, in order to minimize the phenomenon of falling pile up. When there are bentonite composite waterproofing mat (GCL) and pipeline equipment connection construction, its construction methods, the bottom of the pipe should be poured concrete to prevent through the pipe shaking, the gap around the pipe with bentonite powder to fill, and then thoroughly hair sealing treatment. Pipes around the waterproofing pad with fine wire tie.

6, bentonite waterproofing blanket must be laid in a way to ensure that the bentonite waterproofing blanket and the following foundation in direct contact, excluding folds. Any wrinkles, folding or arching may cause the soil layer of other geomaterials to occur the same situation, in order to avoid wrinkles, folding and arching, we will be in accordance with the requirements of the technical note through the bentonite waterproofing blanket re-laying or cutting and repair to eliminate these problems.

7, bentonite waterproofing blanket equipment must be approved by the supervising engineer to use, do not allow the use of unprotected razor or "fast knife". Construction equipment that may damage the bentonite blanket can not act directly on the bentonite blanket. A feasible laying method is to drive the bulldozer backwards and spread the bentonite blanket on the front of the bulldozer in front of the crane. If the earth machine in the foundation soil left a car print, should be in the paving work before continuing to restore the original state.

8, laying bentonite blanket to minimize the drag of bentonite blanket on the foundation, so as not to cause damage to the contact surface of the bentonite blanket and the ground. If necessary, you can put a layer of temporary geotextile on the ground to reduce the bentonite blanket in the laying process due to friction caused by damage.

9, bentonite blanket laying and lap should be parallel to the direction of slope inclination. When the bentonite composite waterproofing mat (GCL) in water conservancy projects, its special construction methods see SL/T225 "water conservancy and hydropower engineering geosynthetics application specifications". Construction, bentonite waterproofing blanket along the direction of water flow along the water lap, that is, the upstream of the bentonite composite waterproofing blanket lap in the downstream of the bentonite waterproofing mat. When the bentonite composite waterproofing mat (GCL) in highway engineering applications, its special construction methods see JTJ/T019-98 "Highway Geosynthetics Application Technical Specification".