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Advantages and Disadvantages of FRP Composite Manhole Cover

Advantages and Disadvantages of FRP Composite Manhole Cover
The FRP Composite Manhole Cover is a new type of composite materials. It is made of engineering plastics as the main raw material and strengthened with steel bars. The manhole cover can completely replace cast iron. FRP manhole cover, no recovery value, no impact noise, corrosion resistance, friction resistance, high temperature resistance, and can adjust various colors as needed.
The manhole cover with screw lock solved the urban trap problem and improved the taste of the city road. It not only has high strength, beautiful appearance, but also has the advantages of anti-aging, acid and alkali resistance, impact resistance, long life, long design, good design, good sealing performance, silent, low price and so on.
Products are widely used in municipal, residential, gas, water, rain, communications, chemical, green and other industries. Due to the characteristics of the product, round and square of different specifications and different colors can be customized according to the requirements of the user, and various relief patterns and text symbols can be printed on the surface.

Corrosion resistance manhole cover
It has an artistic atmosphere and is in harmony with the surrounding environment.
The composite manhole cover is made of high-performance SMC composite material. It has no recovery value, acid and alkali resistance, salt corrosion resistance, no rust, and can be used under various harsh environmental conditions. It is suitable for a wide temperature range: - 50 ° C to 150 ° C can be used under conditions, can withstand 2 million fatigue tests, and has a service life of more than 30 years.
Polymer glass fiber reinforced plastic composite manhole cover
The research on polymer glass fiber reinforced plastic manhole covers began construction of highways in the United States and Germany in this century. By the end of the year, the speed of expressway construction in the world was extremely fast, and the mileage of expressways increased year by year, which greatly promoted the economic development of various countries. In the 1980s, China formulated a policy for the development of expressways, focusing on the development of automobiles as a pillar industry. During the year, the first expressway of the Hujia Expressway on the mainland was completed and opened to traffic. Soon after, Dalian and Beijing-Tianjin-Tanggu Expressway were put into operation. Since then, China's highway construction has entered a new era. At present, most of China's expressways are built in the coastal areas of Liaoning Peninsula, Shandong Peninsula, Beijing-Tianjin, Yangtze River Delta and Pearl River Delta. Except for parts of Shandong, most of the coastline is muddy, especially near the Dajiang Estuary and the Dahe Estuary, mainly rivers, marine or lake sediments. They are geologically quaternary new shoals, mostly saturated. Compacted clay Wei Weilong. Most soil types are silt, silty clay, silty clay, and some areas in the south have silt layers. When constructing roads on such soft soil foundations, engineering problems such as stability and deformation will be encountered. In particular, highways not only require stable dikes, but also require high settlement after construction. In particular, it is necessary to strictly control uneven settlement after work.
Judging from the operation of the expressway on the soft soil foundation, the settlement after construction is large, causing the phenomenon of “bridge head jumping”, affecting the driving speed, damaging the vehicle, and causing traffic accidents and losses. Highway Code 1 stipulates that the general road sections for post-construction settlement of expressways and primary roads are smaller than culverts or box-type passages, and the adjacent positions between the abutments and embankments are small. Therefore, building highways on soft soil foundations, how to reduce post-construction settlement is still an urgent problem to be solved. At present, there are two main types of embankment soft foundation treatment: soil-based improvement, including strong pressure method, displacement method, pre-pressure method and drainage consolidation method. One method is a composite foundation method in which structures such as piles and geogrids are placed. The pile composite foundation includes a flexible pile composite foundation, such as a cement mixing pile, a loose pile composite foundation, such as a gravel pile, and a rigid pile composite foundation, such as a low-strength concrete pile. Each reinforcement technology has its applicability and limitations. For softer, less permeable soils, the reinforcement method is more effective. It does not apply to soft clay and has an effect on the reinforcement of clay and silt in coastal areas. The method of limiting the preloading method has the problem of stability of the embankment due to the low strength of the soft soil, and only the staged loading can be performed, and the construction period is long. In addition, overload preloading requires additional earthwork, which will take up more of the arable land and damage the environmental cement mixing pile bulk material.

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