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土工格栅如何解决旧路面裂缝
日期:2020年 04月 29日 共阅:72次 文章来源:山东肥城联谊工程塑料有限公司
       路面改建工程中使用的土工格栅材料,检测手段等是路面改进过程中要解决的主要问题。旧路路面较完整时,因使用有一定的年限,路面使用性能衰减,可将旧路面作为底基层加铺土工格栅。可充分利用旧路较完整的路面,节省成本投资,达到改善使用性能的目的。半刚性基层设计厚度大于施工碾压最大厚度时应分层碾压。其一般最大厚度为20cm,设计选用半刚性基层厚度较碾压厚度稍大,可考虑使用土工格栅。从而节省半刚性基层材料,达到降低工程投资的目的。
The geogrid materials and testing methods used in pavement reconstruction are the main problems to be solved in the process of pavement improvement. When the old road surface is relatively complete, due to a certain number of years of use, the service performance of the road surface is weakened, so the old road surface can be used as the subbase and paved with geogrid. It can make full use of the old road's more complete pavement, save cost and investment, and achieve the purpose of improving the use performance. When the design thickness of semi-rigid base is greater than the maximum thickness of construction rolling, rolling shall be carried out in layers. Generally, the maximum thickness is 20cm, and the thickness of semi-rigid base is slightly larger than that of rolling, so geogrid can be considered. So the semi-rigid base material can be saved and the project investment can be reduced.
      水泥路面因为养护,水分等原因会出现横向和纵向裂缝,首先,裂缝如果大就需要先灌浆然后在裂缝上面铺土工格栅,要求土工格栅两侧边缘距离裂缝都要20cm及以上。其次如果裂缝小直接铺土工格栅即可,注意铺土工格栅之后最好是全幅铺,然后用带帽钢钉固定。基本全幅8米宽的路要在土工格栅两侧一共钉大于8个带帽钢钉,然后撒铺封层或者粘层铺沥青就可以了。
The cement pavement will have transverse and longitudinal cracks due to maintenance, moisture and other reasons. First of all, if the cracks are large, it is necessary to grout first and then pave the geogrid on the cracks. The distance between the two sides of the geogrid and the cracks is 20cm or more. Secondly, if the crack is small, directly lay the geogrid. Pay attention that after laying the geogrid, it is better to pave it in full width, and then fix it with the cap steel nail. Basically, for the whole 8-meter-wide Road, a total of more than 8 capped steel nails shall be nailed on both sides of the geogrid, and then the sealing layer or asphalt layer shall be spread.
       对裂缝数量较多的路面可采用在原路面顶面铺加土工格栅的方式。从根本上解决旧路面裂缝向上扩展的问题。裂缝较大处应将原路面灌缝处理,再铺设土工格栅。对路面裂缝分布的不同情况,可采用不同的铺设方式。如裂缝分布较稀疏,根据应力影响范围铺设一定长宽的土工格栅。对应力分布较复杂的路段可全幅铺设。加宽部分为土基时,新旧结合处会出现纵向裂缝,可将土工格栅位于原路面与新土基顶面,使其分散到较大平面上。对旧路加宽时,应在加宽路基部分加铺--层粉煤灰半刚性基层材料。

For the pavement with a large number of cracks, the method of paving Geogrid on the top of the original pavement can be adopted。 Fundamentally solve the problem of crack upward expansion of old pavement。 If the cracks are large, the original pavement shall be grouted and then geogrid shall be laid。 For different distribution of pavement cracks, different laying methods can be adopted。 If the crack distribution is sparse, geogrid with a certain length and width shall be laid according to the influence range of stress。 The road section with complex stress distribution can be paved in full width。 When the widened part is soil foundation, there will be longitudinal cracks at the joint of the old and the new。 The geogrid can be located on the top surface of the original road surface and the new soil foundation, so that it can be dispersed to a larger plane。 When the old road is widened, the widened subgrade shall be paved with fly ash semi-rigid base material。

土工格栅

      反射裂缝本身对覆盖层的性能影响不大,但环境因素(雨、雪、氧化、粉尘)的负面影响往往使裂缝迅速扩展,缩短覆盖层的使用寿命。为了有效减缓旧水泥混凝土路面裂缝的反射速度或减小沥青加铺层厚度,国内外研究人员进行了大量的试验,既积累了成功的经验,也吸取了许多失败的教训。为了防止反射裂缝,国外采用加厚沥青加铺层的方法。但是单纯依靠增加铺层厚度有其缺点:一方面,加铺层厚度的增加受到街道高程的限制;而且,加铺层厚度的大幅度增加会增加路面的成本。
The reflection crack itself has little effect on the performance of the covering layer, but the negative effects of environmental factors (rain, snow, oxidation, dust) often make the cracks expand rapidly and shorten the service life of the covering layer. In order to effectively slow down the reflection speed of old cement concrete pavement cracks or reduce the thickness of asphalt overlay, researchers at home and abroad have carried out a lot of tests, which not only accumulated successful experience, but also learned many failed lessons. In order to prevent reflection cracks, the method of thickening asphalt overlay is adopted abroad. However, there are some disadvantages of simply increasing the thickness of pavement layer: on the one hand, the increase of the thickness of overlay layer is limited by the height of street; moreover, the substantial increase of the thickness of overlay layer will increase the cost of pavement.
       此外,夏季沥青混合料在高温下很容易导致车辙,从而失去了旧水泥混凝土板作为基层产生的坚实基础和薄表面的优势。因此,采用加厚沥青加铺层的方法是不可取的。针对这种情况,在查阅大量数据、理论分析和论证的基础上,决定在旧水泥混凝土路面上铺设玻璃纤维格栅加固层,然后在其上铺上沥青混凝土面层。采用这种方法铺设的路面,可以防止基层裂缝的反射,减少路面的车辙,延长路面使用寿命。玻璃纤维格栅具有抗拉强度高、伸长率低、无蠕变、与沥青混合料相容性好、理化性能稳定、耐高温、锁紧性强、极限效应强等特点。其主要功能是均匀传递轴向载荷。反射裂缝应力由垂直向水平变化。
In addition, in summer, asphalt mixture will easily lead to rutting under high temperature, thus losing the advantage of the old cement concrete slab as a solid foundation and thin surface. Therefore, it is not advisable to use the method of thickening asphalt overlay. In view of this situation, on the basis of consulting a large number of data, theoretical analysis and demonstration, it is decided to lay the glass fiber grid reinforcement layer on the old cement concrete pavement, and then lay the asphalt concrete surface layer on it. The pavement paved by this method can prevent the reflection of the base cracks, reduce the ruts of the pavement, and extend the service life of the pavement. The glass fiber grid has the characteristics of high tensile strength, low elongation, no creep, good compatibility with asphalt mixture, stable physical and chemical properties, high temperature resistance, strong locking and strong limit effect. Its main function is to transmit the axial load uniformly. The stress of reflection crack changes from vertical to horizontal.
       相信大家看完以上内容以后,应该也对图个革汉如何解决就路面裂缝有所了解了吧,希望会对大家有所帮助吧。
I believe that after reading the above content, you should also have some understanding of how to solve the road cracks in figure Gehan. I hope it will help you.
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