Construction method of bentonite waterproof blanket
GCL preparation before laying:1) do the material analysis, draw the bentonite composite waterproof pad (GCL) laying sequence and cutting diagram. (auxiliary tools are ready)2) check the appearance quality of bentonite composite waterproof mat (GCL), record and repair the mechanical damage, production trauma, cavity and so on.3) the construction of bentonite composite waterproof mat (GCL) should be carried out under no rain or snow free weather. In case of rain or snow during construction, plastic film will be used to cover and prevent the hydration of GCL in advance.
Laying of GCL:1) wide, large bundles of bentonite composite waterproof pad (GCL) should be used in laying construction machinery; condition does not have a narrow and small bentonite composite waterproof pad (GCL), also can use artificial paving.2) laying the bentonite composite waterproof mat (GCL) according to the ordered block and the direction block.3) when the composite waterproof pad (GCL) is laid, the connection between the cushion and the pad should be staggered, and the connection should not be formed.4) the waterproof surface of the composite waterproof mat (GCL) shall not contain sand, water (including dew) and other impurities that affect the quality of the lap joint.5) bentonite composite waterproof pad laying elevation and slope (GCL), in order to avoid the sliding pin pads of the available fixed, except with nails in waterproof pad overlap and edge position of the fixed, the middle of the waterproof pad also depends on the smoothness of the pin, to ensure stable waterproof pad smoothly mounted on the wall and floor, nail holes need to make parts of visual processing (bentonite composite waterproof pad to pad during the construction of long inclined plane along the direction parallel to the direction of laying, so as to reduce the accumulation of falling to the lowest limit.)
Treatment of base (support layer, cushion)1) the grass roots can be divided into soft and hard bases. Before laying GCL, it is necessary to use the necessary equipment to flatten the base, and the compaction degree is above 85%. The surface shall be smooth and smooth, and there shall be no rock or other objects protruding above 2cm, nor shall there be obvious voids.2) there is no poisonous or harmful substance in the upper layer of artificial lake foundation.3) surface should be basically dry, no obvious water accumulation, if there is water, drainage work should be carried out.4) the radius of the base layer and the positive horn shall be no less than 30cm. If the radius of the repair circle exceeds 40cm or even vertically, the anchor shall be fixed after four weeks of anchoring, and the compaction shall be ensured without damaging the waterproof pad.5) a through pipe must be fixed and reinforced with concrete so that it can not sway.6) the anchorage ditch must be dug and compacted as required.
