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The use of plastic filter materials in the new climax of river conversion
The characteristic surface opening ratio of the plastic water filter pipe is the ratio of the area to the area of ​​the opening of the plastic water filter pipe material. It is generally indicated by %, which is an important performance reflecting the water absorption capacity of the plastic water filter pipe material. In general, the larger the surface opening ratio, the better the water absorption performance, and the less likely it is to block. Due to the unique three-dimensional mesh structure of the plastic filter water pipe, the surface opening ratio is extremely high. The surface opening ratio of several common blind groove materials is compared. <2>. Compared with other water pipe materials, the plastic filter water pipe has the main advantage that it is not used for a long time. Will clogging. There is no single-layer water-absorbing hole on the surface of the plastic filter water pipe, and the surface is a three-dimensional water-absorbing surface with unevenness. The water seepage can be fully and uniformly infiltrated, and there is no water-suction hole phenomenon accelerated by the water flow, so that the blockage is not caused.
The void ratio differs depending on the arrangement density of the fibers. The void ratio and drainage capacity and resistance rate of the plastic filter water pipe are over 90%<2>. At present, the void ratio of the domestic plastic water filter pipe is between 82% and 92%, which is 5 times that of the porous pipe and 23 times that of the tubular mesh pipe. Therefore, it has a very high surface water collection and good water permeability. Even if the pressure of the super load reduces the void ratio of the plastic tray water filter pipe to 50%, there is still a large water passing capacity.
High compressive strength and good pressure resistance. The plastic filter pipe is buried in the ground. The upper part has earth pressure and moving load, so it is required to have a certain compressive strength. Traditional blind ditch materials tend to have low compressive strength and are easily damaged under high pressure, resulting in drainage failure. The plastic filter water pipe has high compressive strength and good recovery. Generally, the cross-sectional void ratio is still above 60% under the pressure of 250 kPa. When the pressure is removed, the plastic filter water pipe basically returns to its original shape <3>. The water pipe has a three-dimensional network structure, which can withstand the pressure in all directions, and does not appear like a soft water pipe due to pressure and non-vertical axis. Therefore, the plastic water filter pipe does not have the problem of drainage failure due to overload or other reasons.
It has good flexibility and adapts to the strong deformation ability of the soil. The plastic filter water pipe not only has good pressure resistance, but also has polyethylene as the main raw material. Polypropylene and polyethylene itself have poor UV radiation resistance, but by changing the formula of the material, adding anti-aging The agent has stable performance and is resistant to ultraviolet rays, high temperature and corrosion. The high temperature softening temperature is 120e and the low temperature embrittlement temperature is -60e. Therefore, the plastic filter water pipe can maintain the structure under water and soil for several decades. Stabilize and maintain drainage performance.
Conclusion Plastic water filter pipe is a new type of geosynthetic material. It is gradually replacing traditional drainage materials in the drainage of the embankment to prevent the seepage damage of the embankment. At present, the construction of plastic filter water drainage for 11.03km dike has been completed in the Huanyang River Basin, and more than 33,000 plastic water pipes have been completed.