Waterproof Membrane Laying should be tight
Waterproof film on the temperature and wind requirements:
Waterproof film construction on the temperature and wind requirements are very strict, so the temperature and wind in the construction of the waterproof film, the impact is still great, then what are the requirements of it. Take a look at it.
First, the temperature 5-40 ℃ is appropriate, taking into account the HDPE waterproof film thermal expansion and contraction, according to experience, cold weather, the laying of waterproof film should be tight when some hot days should be relaxed; but pay attention, in the summer should be avoided High temperature at noon
Second, the wind and rain: wind more than 4 or rain should stop construction; wind speed, it is appropriate to sandbags to suppress the waterproof film, followed by moving forward to facilitate the construction site quality meet the design requirements: base surface should be dry, compaction , Smooth, no cracking, no significant sharp, rugged. Its flatness should be within the allowable range of gentle changes, slope average, slope consistent. Composite waterproof membrane and supporting material contact surface should be smooth, so as not to puncture the loss of its anti-seepage effect, otherwise, should be set to fine grain cushion to protect the film is not damaged. Connection to the surrounding border. Composite waterproof membrane and the surrounding border must be tightly combined, the construction can be in the foundation and shore slope excavation anchor slot connection, PVC and butyl rubber film can be used adhesive or melting agent adhesion to the concrete surface, so The length of the embedded can be shorter, because the polyethylene film can not adhere to the concrete surface, so the length of embedded concrete at least 0.8m.
The connection of the composite waterproof film itself, the connection method of the anti-seepage film can be summarized into three kinds, namely, the bonding method, the welding method and the vulcanization method, depending on the raw material of the anti-seepage film, and the impermeability of all the joints To check, to prevent the connection is not good and leakage.
Usually in the corner and deformed area, should be shortened the length of the joint, in addition to special requirements, the slope of more than 1: 6 on the slope from the top of the slope or stress concentration area of 1.5 meters, as far as possible without weld. After the completion of the composite waterproof film laying, should be reduced in the membrane surface walking, moving tools, etc., who can cause harm to the impermeable membrane objects, should not be placed on the membrane or carried on the membrane walking, so as not to cause the film Accidental injury.
In addition, according to the creep law under the conditions of low temperature creep and freeze-thaw cycle, the concept of the freeze-thaw cycle influencing factor DR is put forward, and the calculation method of the creep effect coefficient FcR at low temperature is obtained. The creep of the composite water- The creep value of the temperature rise stage is increased during the freeze-thaw cycle, and the creep value in the cooling stage is reduced and eventually stabilized. The production of composite waterproofing membrane is mainly made of polyethylene or polyvinyl chloride after changing the shape of the film after rolling into a plastic film and polyester acupuncture geotextile heat polymerization, and its anti-penetration function depends mainly on the ability of plastic film Its basic composition principle is the plastic film impermeable barrier channel drain channel, with its large tensile strength and elongation to withstand water pressure and adapt to the deformation of the canal.
In recent years, composite waterproof membrane technology has been widely used in China, in the hydroelectric power engineering, flood dike project, reservoir reinforcement and other projects, has made great profits and social benefits. Composite waterproof membrane compared with the traditional industrial fabrics, it has a strong anti-aging, corrosion resistance, wear resistance, and low cost, do not pollute the environment, can be said to be energy saving, he not only improved our use effect. But also greatly shortened our duration, really serve two purposes Its comprehensive benefits are very significant, mainly for the reservoir area, dams, channels and other water conservancy buildings in the overall and local anti-seepage reinforcement, the current statistical data, it has achieved great economic and social benefits.