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The performance of geogrid is determined by the raw materials used

The performance of geogrid is determined by the raw materials used

  • Categories:NEWS
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  • Time of issue:2020-07-16
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(Summary description)The high density polyethylene (HDPE) used in the geogrid can ensure that it will not be eroded by acid, alkali, salt solution or oil at normal temperature, and will not be damaged by water dissolution

The performance of geogrid is determined by the raw materials used

(Summary description)The high density polyethylene (HDPE) used in the geogrid can ensure that it will not be eroded by acid, alkali, salt solution or oil at normal temperature, and will not be damaged by water dissolution

  • Categories:NEWS
  • Author:
  • Origin:
  • Time of issue:2020-07-16
  • Views:0
Information

The high density polyethylene (HDPE) used in the geogrid can ensure that it will not be eroded by acid, alkali, salt solution or oil at normal temperature, and will not be damaged by water dissolution or microorganism. At the same time, the polymer properties of polyethylene can resist the aging caused by radiation. After the grid is stressed, the longitudinal and horizontal ribs will work together, and the node will not be cracked or damaged. But in the actual project, after the compaction of the filler, it is not eroded by ultraviolet light and oxygen, so it can fully meet the requirements of engineering construction.

Construction process of geogrid: detection and cleaning of lower bearing layer manual laying of geogrid lapping, binding and fixing paving upper subgrade soil rolling testing.

The geogrid is laid on the flat lower bearing layer according to the width required by the design, and the upper and lower layers of the geogrid are free of impurities that may damage the geogrid. When laying the geogrid, the direction with high strength shall be arranged perpendicular to the axis of the embankment. Geogrid is laid horizontally. When laying, tighten and straighten to avoid wrinkling, twisting or potholes. The lapping method is adopted for longitudinal splicing of geogrids, and the lap width is not less than 30cm. After the geogrid is laid, the upper layer of filler shall be laid manually, and the rolling shall be completed in time to avoid long-term exposure to the sun. Then the material is transported, leveled and rolled mechanically. The mechanical paving and rolling shall be carried out from both sides to the middle, and the rolling shall be carried out from both sides to the middle, and the compactness shall meet the specification requirements.

The application of glass fiber geogrid composite material can reduce the blockage of relief well. The main measure to reduce deposition is to change the filter into a detachable type. The removable filter is made of foam plastic as filter body. It can be divided into fixed parts and detachable parts. The fixed parts are outer filter, filter screen and well pipe. The removable part is foam plastic filter, which is wrapped with nylon net. The foam plastic filter can be regularly cleaned or replaced to keep the permeable performance of the filter body always good.

It should be noted that the granular filter material in the filter body, and the material with larger particle size should be used as far as possible under the premise of meeting the granular filter criteria. For example, the pressure relief well of Guanyinsi sluice on Jingjiang levee and the Mississippi River in the United States have adopted granular materials with particle sizes of 8mm and 13mm respectively as filter layers, which have been used for many years with good results. Some projects also use geotextile as filter layer. For example, two layers of 350g / m2 geotextile are used as filter layer in relief well of Xinjiang main dike in wuhanyang, and geotextile or nylon mesh with 350g / m2 wrapped in relief well is also used as filter screen in Anhui river levee. Their effect needs to be improved.

With regard to the construction and implementation of the filter body, the fiberglass geogrid filtration system is made up of porous polyurethane foam, thick 50mm, and the diameter of the filter is 280mmPP rigid plastic flower tube, which mainly plays a supporting role for the foam. Outside, 400 nylon net is used to wrap the foam plastics, so that it is tightly attached to the plastic flower tube. In order to prevent the filter body from falling off in the process of placing and pulling. The length of each section of the filter body is 2, and the sections are connected by bolts.

Geogrid can be used for decades in harsh environment. It has high tensile strength, contains carbon black, corrosion resistance and low engineering cost, so it can replace the traditional reinforced materials. Plastic tensile geogrid is a kind of network building material which is made of high-density polypropylene or high-density polyethylene by hot-melt stretching. The outer layer of steel plastic geogrid is wrapped by PVC plastic layer.

Coal mine double resistant geogrid is treated by adding antistatic agent and flame retardant on the basis of common plastic bidirectional geogrid, which is used as the support net of underground mine, such as side protection net and false roof net. This modified plastic has excellent physical and chemical properties, such as aging resistance, high temperature resistance, water resistance, no rust, UV resistance, wear resistance and so on, which determines its service life is longer than that of metal mesh products. The glass fiber geogrid also has its special technology, modified asphalt coating, transverse and longitudinal warp knitted net, also has the overall tensile strength, stability of physical and chemical properties of the special advantages.

 

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