The steel plastic geogrid is a kind of steel plastic composite reinforced belt (built-in high-strength carbon spring steel wire < stress material), which is clad with polyethylene resin (protective material) outside. It is arranged at right angles to the plane longitude and latitude, and formed by ultrasonic welding. It is a comprehensive product of existing rigid steel bars (flat steel strip, ribbed steel strip galvanized steel strip, stainless steel strip, reinforced concrete strip, etc.) and flexible steel bars (polypropylene strip, plastic geogrid warp knitted grid, etc.).
Because of its high tensile strength. It can effectively treat the soft soil foundation, restrain the lateral displacement of the soil, overcome the uneven settlement of the soil, greatly enhance the bearing capacity of the foundation, and improve the overall performance of the foundation; It can be widely used in road engineering, railway engineering, retaining structure and dam engineering, water conservancy engineering, tunnel engineering reinforcement and strengthening; it can resist rutting, prevent pavement cracking, etc., which have significant guarantee effect and good social and economic benefits.
(1) Geogrid shall be laid in full width on the flat lower bearing layer within the scope of subgrade filling.
(2) Geogrid. The upper and lower fillers shall be free of sundries that may damage the geogrid. When laying the geogrid, the direction with high strength shall be arranged perpendicular to the embankment axis.
(3) The longitudinal and transverse strength of steel plastic geogrid is equal.
(4) Use bamboo piles (or wooden piles) to mark the scope of the excavation volume, and then lay it.
(5) All construction vehicles and construction machinery shall not be driven or parked on the paved geogrid, and the quality of geogrid shall be checked at any time during construction. In case of any damage such as fold, puncture, tear, etc., repair or replace according to the extent.
土工格栅应充分拉紧、平整、顺直;两侧宽度与路基同宽。土工格栅的连接-般采用绑扎搭接宽度不应小于30cm。为使搭接处满足设计要求,一般每隔10- _15cm 应有一个绑扎点;受力方向至少应有两个绑扎点。多层铺设时,上下层搭接应错缝布置。相邻两幅土工格栅采用铺设时绷紧，拉挺.避免折皱、扭曲或坑洼。土工格栅沿纵向拼接采用搭接法，搭接宽度不小于20cm,并用“U"形地锚予以锚固。格栅铺设好后应及时用土料填盖, -般不应超过两天,如紫外线照射较弱,可适当延长覆盖时间。
The geogrid shall be fully tensioned, flat and straight; the width of both sides shall be the same as that of the subgrade. The connection of geogrid - generally, the binding and overlapping width shall not be less than 30cm. In order to make the lap joint meet the design requirements, generally there should be one binding point every 10 - cm; there should be at least two binding points in the direction of stress. When laying in multiple layers, the upper and lower layers shall be staggered. The two adjacent geogrids shall be tightened and stretched when laying to avoid wrinkles, twists or potholes. The geogrid shall be spliced along the longitudinal direction by the lap method, with the lap width not less than 20cm, and anchored by the "U" shaped ground anchor. After the grating is laid, it shall be covered with earth material in time. Generally, it shall not exceed two days. If the ultraviolet radiation is weak, the covering time can be extended properly.
In order to ensure that the steel plastic geogrid will not be damaged and the anchoring effect, the hole is formed in the geogrid for anchoring, and the anchoring length is not less than 1.4m, so as to ensure that the length of the lower geogrid anchored in the undisturbed soil sample is not less than the design value. The anchor hole shall be formed by dry operation, M30 cement mortar shall be injected into the hole, and the "U" shaped reinforcement shall be inserted through the grid hole to form the anchor. One anchor shall be set every 50cm along the longitudinal direction of the route. The ground anchor steel bar is made of φ 25 steel bar by bending and antirust treatment. Two oil and two cloth are wrapped with plastic hose.
After the geogrid is laid, the subgrade shall be filled. Manually lay the upper filler, timely complete rolling and avoid long-term exposure to the sun. Then the material shall be transported and leveled and rolled by machinery. 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. Filling requirements: the maximum material diameter of the embankment earth rock mixed embankment material within 8em from the geogrid layer shall not be greater than 6cm. The first layer of geogrid earth rock shall be compacted along the axis direction of the embankment, and the filling compaction thickness shall be greater than 60cm. In order to avoid certain damage to the geogrid caused by the rolling or turning of transportation vehicles, the rolling and filling method can be used for earth rock construction, bulldozer bulldozing, roller rolling, and earth rock filling and rolling shall meet the specification requirements of subgrade earth rock compaction.
Steel plastic geogrid is superior to general geogrid in performance, with high strength and high modulus, low creep, anti-corrosion, resistance to chemical embrittlement and can be pre designed and other characteristics. It is an excellent material used in road engineering. In road engineering, the use of steel plastic geogrid can effectively control rutting. Control the reflection crack, slow down the damage degree of the road surface, improve the service life of the road, and reduce the cost of road construction.
I believe that after reading the above content, you should also have some understanding of how steel plastic geogrid enhances highway subgrade. I hope it will help you.