土工格栅在半填半挖路段的技术要求

更新时间：2020/4/22 13:54:42信息编号：2679015

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详细介绍

在路基土方施工中,土工格栅是由聚丙烯、聚氯乙烯等高分子聚合物经热塑或模压而形成的，同时具有较高的抗拉强度和弹性模量的立体网格屏栅VLkF。与其他土工合成材料相比，具有加固路基、防止变形、分散荷载等特定的作用。将土工格栅埋置于土中，可以用作加筋土结构的筋材或复合材料的筋材。

In the construction of Subgrade Earthwork, geogrid is a three-dimensional grid grid with high tensile strength and elastic modulus, which is formed by thermoplastic or molded polymer such as polypropylene and polyvinyl chloride. Compared with other geosynthetics, it can strengthen the roadbed, prevent deformation, disperse load and so on. When geogrid is buried in soil, it can be used as reinforcement of reinforced soil structure or composite material.

在路基土方施工中,对于土体不稳定的填挖交界处,双向土工格栅应用最为有效。作为一种路用材料,在路基补强施工中，可使粒状填料与网格互相锁合在-起,形成稳定的平面,防止填料下陷,并可将垂直荷载分散,在高填方及半填半挖地段可采用多层补强的方法;

In the construction of Subgrade Earthwork, the two-way geogrid is the most effective for the unstable interface of filling and excavation. As a kind of road material, in the construction of subgrade reinforcement, the granular filler and grid can be locked together to form a stable plane, prevent the filler from sinking, and disperse the vertical load. In the high fill and half fill and half dig sections, the multi-layer reinforcement method can be used;

在路面施工中,使网格与路面材料掺合在一起，可以有效地分散传递荷载,防止路面裂纹,并可承受一定的冲击载荷,防止翻浆造成的路面沉陷和裂纹。地形处于山岭重丘区的高速公路,段内山岭重叠、沟壑纵深，使用土工格栅用于高填方及半填半挖路段,可有效减少路基与桥台的沉降差,降低车辆与路基振动,减缓路基结构变形，提高车辆行驶的安全舒适性能。

In the pavement construction, the grid and pavement materials can be mixed together, which can effectively disperse and transfer the load, prevent the pavement crack, bear certain impact load, and prevent the pavement subsidence and crack caused by the frost. For the expressway with the terrain in the mountainous and heavy hilly area, the mountains overlap and the gullies are deep. The geogrid is used for the high fill and half fill and half dig sections, which can effectively reduce the settlement difference between the subgrade and the abutment, reduce the vibration between the vehicle and the subgrade, slow down the deformation of the subgrade structure, and improve the safety and comfort performance of the vehicle driving.

双向土工格栅是用高分子聚合物通过挤压、成板、冲孔过程后再纵向、横向拉伸而成,通过工艺过程使聚合物的长链碳氢分子沿拉伸方向重新排列成一条直线，因而具有较高的抗拉强度和较低的延伸率b d s h 5 c o m。其抗拉强度已接近于软钢,同时孔眼具有对土的锁定作用，使得在纵向和橫向上都具有很大的拉伸强度。这种结构在土壤中同样也能提供-一个有效的力的承担和扩散的理想连锁系统,适应于大面积永久性承载的地基。通过有效的施工作业,可以起到提高地基承载力、限制土体的侧向位移、扩散应力的作用。

The bi-directional geogrid is made of polymer by extruding, plate forming, punching and then stretching longitudinally and transversely. The long chain hydrocarbon molecules of polymer are rearranged into a straight line along the stretching direction through the technological process, so it has high tensile strength and low elongation. Its tensile strength is close to that of mild steel, and the hole has a locking effect on the soil, which makes it have a great tensile strength in both longitudinal and transverse directions. This kind of structure can also provide an effective chain system of bearing and diffusion of force in soil, which is suitable for large area of permanent bearing foundation. Through effective construction, it can improve the bearing capacity of the foundation, limit the lateral displacement of the soil and spread the stress.

双向土工格栅，其技术要求符合交通部行业标准JT T480—2002《交通工程土工合成材料(土工格栅)》的技术标准。要求双向土工格栅极限抗拉强度≥35 kN/m。填土高度≤3 m时,铺设一层土工格栅,格栅满铺于路面底面以下80 cm处,即路床底部;填土高度>3 m时,增设两层土工格栅,分别位于路面底面以下1.8 m及2.8 m处本地生活网www.bdsh5.com。同时对填挖交界处的填方路基的压实度要求提高2% ,必要时采用重锤夯实,以确保路基稳定。

The technical requirements of two-way geogrid meet the technical standards of jtt480-2002 traffic engineering geosynthetics (geogrid). The ultimate tensile strength of two-way geogrid is required to be ≥ 35 kn / m. When the filling height is less than or equal to 3m, a layer of geogrid shall be laid. The geogrid shall be fully laid 80 cm below the pavement bottom, i.e. the bottom of the roadbed; when the filling height is more than 3m, two layers of geogrid shall be added, respectively 1.8m and 2.8m below the pavement bottom. At the same time, the compactness of the filling subgrade at the interface of filling and excavation shall be increased by 2%. If necessary, heavy hammer shall be used for compaction to ensure the stability of the subgrade.

填方高度> 10 m的路基,采用加筋土路堤收缩坡脚,加筋边坡采用1 : 1,每10m高处设-级2 m宽的平台。坡面采用拱形骨架内种草防护。土工格栅沿坡高层层水平铺设,竖向间隔为0.5 m,第一级边坡筋带长度按16m,8 m依次变化，第二级边坡筋带长度按16m、8 m.8 m依次变化。

For the subgrade with filling height > 10 m, the reinforced soil embankment is used to shrink the slope toe, and the reinforced slope is 1:1. A platform of - class 2 m wide is set every 10 m. The slope surface is protected by planting grass in arch skeleton. The geogrid is laid horizontally along the high-rise layer of the slope, with a vertical interval of 0.5m. The length of the first grade slope reinforcement varies in order of 16m and 8m, and the length of the second grade slope reinforcement varies in order of 16m and 8m.

为了确保路基整体稳定性,每侧应各加宽0.5 m。对含水量适中的路基表面进行整平后,用压路机稳压两遍，再用50T振动压路机震压4遍来源www.bdsh5.com。按设计文件要求先铺垫30 cm厚的砂砾,人工配合平地机整平后,振动压路机静压两遍。土工格栅的铺设。首先用锚钉固定稳固格栅端部,用铺设机或人工将格栅缓缓向前拉伸平铺。在铺设过程中，随时安排专人检查格栅平整度,要求格栅底面必须平整、密实，确保格栅平铺、拉直,按卷交替、连续铺设。

In order to ensure the overall stability of the subgrade, each side shall be widened by 0.5m. After the subgrade surface with moderate water content is leveled, the road roller is used to stabilize the pressure twice, and then 50t vibration compaction is usedThe road machine shall be vibrated 4 times. According to the requirements of the design documents, 30 cm thick sand gravel shall be paved first, and then the vibration roller shall be static pressed twice after manually cooperating with the grader for leveling. Laying of geogrid. First, fix the end of the grid firmly with anchor nails, and use the paver or manual to slowly stretch the grid forward and pave. During the laying process, special personnel shall be arranged to check the flatness of the grid at any time, and the bottom surface of the grid shall be flat and dense to ensure that the grid is laid flat and straight, and laid alternately and continuously according to the roll.

首层土工格栅铺设完成后，随即开始铺设第二层厚20 cm的砂砾:汽车运砂砾卸于路基一侧, 而后整平机械向前推进。应先对路基两侧2 m范围内填筑10 cm厚度,把第一层土工格栅折翻上来再填筑剩余10 cm的砂砾，禁止两侧向中间填筑和推进,严禁各种机械在没有铺筑砂砾的土工格栅上行驶作业，这样可最大程度地保证土工格栅平整,不起鼓.不起皱,提高路用性能来自www.bdsh5.com。第二层砂砾填筑平整后，即时检查铺筑厚度,检测无误后用振动压路机静压两遍。

After the first layer of geogrid is laid, the second layer of 20 cm thick gravel will be laid immediately: the gravel will be transported by car and unloaded on one side of the subgrade, and then the leveling machine will move forward. Should firstFill 10 cm thick within 2 m of both sides of the subgrade, turn the first layer of geogrid up and fill the remaining 10 cm of gravel. It is forbidden to fill and push both sides to the middle. It is forbidden to drive all kinds of machinery on the geogrid without paving gravel, so as to ensure the geogrid to the greatest extent is flat, does not bulge, does not wrinkle, and improves the road performance. After the second layer of gravel is filled and leveled, the paving thickness shall be checked immediately, and the vibratory roller shall be used for static pressing twice after the detection is correct.

以此方法类推，进行第二层土工格栅的铺筑,第二层铺筑完成后再填筑砂砾,振动压路机静压两遍后，即完成路基基底的加固措施。依据设计图纸要求,砂砾碾压完成后,沿路线纵向在边坡两侧各铺设土工格栅两幅,搭接宽度20cm,按上述方法搭接固定牢固后开始进行土方施工作业。

By analogy with this method, the second layer of geogrid is paved. After the second layer is paved, gravel is filled. After the vibratory roller is static pressed twice, the reinforcement measures of subgrade base are completed. According to the requirements of the design drawings, after the completion of gravel rolling, two geogrids shall be laid on both sides of the slope along the longitudinal direction of the line, with a lap width of 20cm. The earthwork construction shall be started after the above methods are firmly lapped and fixed.

高填方路基边坡土工格栅的防护施工中，每填筑两层土就需同时铺设两侧各-层土工格栅，然后以此类推,直至铺到路肩表层土下。

In the protection construction of Geogrid for high fill subgrade slope, each layer of Geogrid on both sides shall be laid at the same time for each two layers of filling soil, and so on until it is laid under the surface soil of road shoulder.

相信大家看完以上内容以后，应该也对土工格栅在半填半挖路段的技术要求有了一定的了解，希望会对大家有所帮助吧。

I believe that after reading the above content, you should also have a certain understanding of the technical requirements of Geogrid in the half filled and half dug road section, and I hope it will help you.

本文词标签：双向土工格栅

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