双向土工格栅加筋土路基的施工工艺

       格栅是用聚丙烯、聚乙烯等高分子聚合物经热塑或模压而成的二维网格状或具有一定高度的三维立体网格屏栅，当作为土木工程使用时，称为土工格栅本.地.生.活.网。经过拉伸形成的具有方形或矩形的聚合物网材，按其制造时拉伸方向的不同可为单向拉伸和双向拉伸两种。它是在经挤压制出的聚合物板材（原料多为聚丙烯或高密度聚乙烯）上冲孔然后在加热条件下施行定向拉伸。单向拉伸格栅只沿板材长度方向拉伸制成；双向拉伸格栅则是继续将单向拉伸的格栅再在与其长度垂直的方向拉伸制成。

Grid is a kind of two-dimensional grid or three-dimensional grid with a certain height, which is made of polypropylene, polyethylene and other high polymer by thermoplastic or molding. When it is used as civil engineering, it is called geogrid. The polymer mesh with square or rectangle formed by drawing can be divided into unidirectional drawing and biaxial drawing according to the different drawing directions during manufacturing. It is a kind of directional drawing which is carried out under the condition of heating after punching holes on the extruded polymer plates (mostly polypropylene or high-density polyethylene). The unidirectional stretch grid is only made by stretching along the length direction of the plate; the bidirectional stretch grid is made by stretching the unidirectional stretch grid in the direction perpendicular to its length.

       特点：聚乙烯双向土工格栅的突出优点是在长期持续载荷作用下变形（蠕变）的倾向很小，抗蠕变强度大大优于其它材料的土工格栅，对于提高工程使用寿命具有重要作用。该产品适用于修建公路、铁路以及江河湖海岸边的加筋档土墙、堤坝、桥面、陡坡及土工格室等工程。其作用是可提高挡土墙或堤坝的承载力，延长使用寿命，减少占地面积，缩短工期，降低造价，减小维修费用本~地~生~活~网。

Features: the outstanding advantage of polyethylene bidirectional geogrid is that the tendency of deformation (creep) is very small under long-term continuous load, and the creep strength is much better than other geogrid materials, which plays an important role in improving the service life of the project. The product is suitable for the construction of reinforced retaining walls, dikes, bridge decks, steep slopes and geocell along the highway, railway and river and lake coasts. Its function is to increase the bearing capacity of the retaining wall or dam, extend the service life, reduce the occupied area, shorten the construction period, reduce the cost and reduce the maintenance cost.

       双向土工格栅是由高分子聚合物经挤出压成薄板再冲规则孔网，然后纵向拉伸而成。这种过程中使高分子成定向线性状态并形成分布均匀、节点强度高的长椭圆形网状整体性结构。此种结构具有相当高的拉伸强度和拉伸模量，给土壤提供了理想的力的承担和扩散的连锁系统。该产品拉伸强度大（＞150Mpa），适应各种土壤，是目前广为采用的加筋加固材料。

The bi-directional geogrid is formed by extruding and pressing the polymer into a thin plate, then punching the regular hole net, and then stretching longitudinally. In this process, the polymer becomes a linear orientation state and forms a long elliptical network structure with uniform distribution and high node strength. This kind of structure has high tensile strength and modulus, which provides an ideal chain system of force bearing and diffusion for soil. The product has a large tensile strength (> 150MPa) and is suitable for various soils. It is a widely used reinforcement material at present.

      土工格栅在路基中的作用主要体现在两个方面。①提高地基承载力，减少沉降，增加地基稳定性来源www.bdsh5.com。②增强土体的整体性及连续性，有效控制不均匀沉降。

The role of Geogrid in subgrade is mainly reflected in two aspects. ① Improve the bearing capacity of the foundation, reduce the settlement and increase the stability of the foundation. ② Enhance the integrity and continuity of soil, and effectively control the uneven settlement.

       土工格栅具有特有的网孔结构，其加筋性能主要表现为格栅网孔与填料的互锁力和嵌固力，结构微小的变形将使格栅与填料产生很强的互锁力和锚固力。在垂直荷载的作用下，土工格栅在产生拉伸应力的同时，对土体产生了一种类似侧向约東压力的作用，使加筋上体具有较高的抗剪强度和变形模量。同时，高弹性模量的土工格栅在受力后将产生垂直应力，抵消部分荷载。另外，在垂直荷载的作用下地面沉降引起两侧土体的隆起或侧移，使土工格栅产生拉应力，阻止土体的隆起或侧移。当地基可能产生剪切破坏时，土工格栅将阻止破坏面的出现，从而提高地基的承载力本 地 生 活 网。

Geogrid has a special mesh structure, and its reinforcement performance is mainly manifested as the interlocking force and embedding force between grid mesh and filler. Small deformation of the structure will make the grid and filler produce strong interlocking force and anchoring force. Under the action of vertical load, the geogrid not only produces tensile stress, but also produces a kind of lateral approximately East pressure on the soil, which makes the reinforced upper body have higher shear strength and deformation modulus. At the same time, the geogrid with high elastic modulus will produce vertical stress after being stressed, which will offset part of the load. In addition, under the action of vertical load, the land subsidence causes the uplift or lateral displacement of the soil on both sides, which makes the geogrid produce tensile stress and prevents the uplift or lateral displacement of the soil. When the foundation may produce shear failure, the geogrid will prevent the occurrence of failure surface, so as to improve the bearing capacity of the foundation.

       土工格栅的铺设。土工格栅铺设时底面应平整、密实，一般应平铺，拉直、不得重叠.不得卷曲、扭结，相邻的两幅土工格栅需搭接0.2m，并沿路基横向对土工格栅搭接部分每隔I米用8号铁丝进行穿插连接，并在铺设的格栅上，每隔1.5~2m用U型钉固定于地而。格栅的下料长度应在设计长度的基础上，根据筋带弯折程度另加一一定的富余，不得少于设计长度。筋带在运输、保管中应防止日光照射，施工时暴露的总时间最长以一个台班为宜，夏天宜更短些。

Laying of geogrid. When the geogrid is laid, the bottom surface shall be flat and dense. Generally, it shall be laid flat and straight without overlapping. It shall not be curled or kinked. The two adjacent geogrids shall be overlapped by 0.2m, and the overlapped part of geogrid shall be connected with No. 8 iron wire every I m horizontally along the subgrade, and the paved geogrid shall be fixed on the ground with U-nails every 1.5-2m. The blanking length of the grating shall be based on the design length, and a certain amount of surplus shall be added according to the bending degree of the reinforcing strip, which shall not be less than the design length. During transportation and storage, the steel belt shall be protected from sunlight. During construction, the maximum exposure time shall be one shift, and it shall be shorter in summer.

       加筋材料铺设时底面应平整.密实，一般应平铺、拉直，不得重叠、扭结。筋带不得与硬质尖锐棱角的填料直接接触b+d+s+h+5+c+o+m。筋带与面板的连接应牢固、可靠，并且易于拉紧、拉直。筋带铺设的主方向与纵向垂直，以保证筋带均匀受力和共同发挥作用。另外，筋带在加筋体中应尽可能均匀分布，保证加筋体能发挥整体作用。筋带在铺设时，其横向倾斜度以不大于5%为宜，这是保证筋带拉紧、拉直、不卷曲、不扭结、不重叠的关键。格栅铺设时，边铺边用填料固定其位置，先用填料在筋带的中后部成若千纵列压住筋带，填料的多少和疏密以足以固定筋带的位置为宜，再逐根检查、拉直、拉紧。

The bottom surface of the reinforced material shall be flat and dense when it is laid. Generally, it shall be laid flat and straightened without overlapping or kinking. Ribbons shall not be in direct contact with fillers with hard sharp edges and corners. The connection between the reinforcing strip and the panel shall be firm and reliable, and easy to tension and straighten. The main direction of the belt laying is vertical to the longitudinal direction, so as to ensure the uniform stress and joint function of the belt. In addition, the ribbons should be distributed as evenly as possible in the reinforced body, so as to ensure that the reinforced body can play an integral role. When laying the reinforcement belt, its transverse inclination should be no more than 5%, which is the key to ensure that the reinforcement belt is taut, straightened, not curled, not kinked and not overlapped. When the grid is laid, fill shall be used to fix its position while laying. First, fill shall be used to press the reinforcing strip in a thousand columns at the middle and rear of the reinforcing strip. The number and density of fill shall be appropriate to fix the position of the reinforcing strip, and then check, straighten and tighten one by one.

       相信大家看完以上内容以后，应该也对双向土工格栅加筋土路基的施工工艺有所了解了，希望会对大家有所帮助吧b+d+s+h+5+c+o+m。

I believe that after reading the above content, you should also have an understanding of the construction technology of the two-way geogrid reinforced soil subgrade, and I hope it will help you.

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