High-strength one-way geogrid and preparation method

Abstract

The invention discloses a preparation method of a high-strength one-way geogrid. The preparation method mainly comprises the steps of preparation of longitudinal ribbed belts and injection molding oftransverse positioning ribbed belts, wherein preparation of the longitudinal ribbed belts comprises the steps of raw material dehumidification, extrusion of raw belts, pre-crystallization heating, embossing and raw belt water cooling; and injection molding of the transverse positioning ribbed belts comprises the steps of longitudinal side-by-side placement of the finished ribbed belts, raw material high-temperature plasticizing, injection of the finished ribbed belts in a forming mold and cooling molding. Compared with a traditional production process, the production process has the advantagesthat the products are more diversified in material selection, better in tensile strength, larger in breadth, uniform in ribbed belt thickness, less in material waste and the like; and moreover, various properties of materials can be given full play of through the production process, so that the product quality is improved.

Description

technical field [0001] The invention belongs to the technical field of geogrids, and more specifically relates to a high-strength unidirectional geogrid and a preparation method thereof. Background technique [0002] Geogrid is a commonly used geosynthetic material. Compared with other geosynthetic materials, it is often used as reinforcement for foundation soil structure reinforcement because of its unique structural form and stress mode. Geogrids are mainly divided into four categories: plastic geogrids, steel-plastic geogrids, glass fiber geogrids and polyester warp-knitted polyester geogrids. [0003] Existing plastic geogrids can be divided into tensile plastic geogrids and welded plastic geogrids. Among them, stretched plastic geogrid includes uniaxially stretched plastic geogrid and biaxially stretched plastic geogrid. All uniaxially stretched geogrids are formed by one-time stretching, and only uniaxially stretched geogrids made of HDPE and PP can be mass-produced....

AI Technical Summary

Problems solved by technology

[0004] (1) The ultimate tensile strength of the unidirectional tensile geogrid made of HDPE can only reach 180kN / m, and the ultimate tensile strength of the uniaxially stretched geogrid made of PP can only be 260kN / m;

[0005] (2) The maximum transverse width of the finished high-strength uniaxially stretched geogrid can only be 2.5m, and the maximum transverse width of the finished uniaxially stretched geogrid with a tensile strength lower than 200kN / m is only 2.5m. It can reach 4m; the small width leads to excessive construction lap joints, which seriously affects the physical properties of the geogrid, resulting in waste of materials and low construction efficiency;

[0006] (3) The width and thickness of the ribs are uneven after one-time stretching, and the tensile strength and weight per unit length are uneven, resulting in insufficient utilization of the physical properties of the material, resulting in waste of raw materials;

[0007] (4) The overall thickness of the finished product is different, and the surface of the rib cannot be embossed. The smooth surface of the product leads to a decrease in the friction coefficient between the rib and the soil, and the embedding effect on the soil is not good;

[0008] (5) The width and thickness error of the narrowest part of the longitudinal rib is about 3 times, resulting in no lateral support force at the narrowest part, resulting in the longitudinal skew problem during forming and rolling and construction;

[0009] (6) The ultimate elongation of uniaxially stretched geogrids made of HDPE and PP are ≤11.5% and ≤10.0%, respectively. If the elongation is too high, the interlocking effect of the geogrid on the soil will be reduced.

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