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施工组织设计是用来指导施工项目全过程各项活动的技术、经济和组织的综合性文件，是施工技术与施工项目管理有机结合的产物，它是工程开工后施工活动能有序、高效、科学合理地进行的保证。

设计图纸是设计院针对对本工程设计出来的结构体系，并制作成图纸，此图纸即叫设计图纸

一般的情况下，对于回填土工程，为了达到土方回填最大的密实程度要做击实试验，测定最佳含水率、最大干密度。

不管怎样，回填土达不到原来自然土的压实程度，设计对回填土承载有个要求，就是回填压实程度，一般百分之九十五以上，为了测定土样回填时的最佳状态，含水率多少，最大干密度等值，然后在分层回填时还要再做试验，看看回填的效果。

试验的目的是用标准的击实方法，测定土的密度与含水率的关系，从而确定土的最大密度与最优含水率。
分为轻型击实试验和重型击实试验2种方法，轻型击实试验适用于粒径小于5mm的粘性土，其单位体积击实功能为592.2KJ/m3；重型击实试验适用于粒径小于20mm的土，其单位体积击实功能为2684.9kJ/m3。

标准最大干密度【maximum dry unit weight】指的是按照标准击实试验方法，土或其他筑路材料在最佳含水量时得到的干密度。

Abstract
Highway construction projects are from the engineering design of the overall situation, in accordance with the characteristics of engineering design drawings and engineering projects in accordance with objective laws and the specific construction project site conditions and project requirements to consider co-ordinating the activities of artificial construction, materials, machinery and construction methods, such as the five elements of all the works of construction technology, construction progress and the corresponding consumption of materials to make scientific and reasonable arrangements for the construction of the continuity of productive activities, coordination, balance and economy to provide the optimal program.
This article first works on the basis of organization and structure, engineering, project profiles, including (starting Ending mileage, geographic location, construction conditions, the project budget estimate, etc.), then describes the works as well as the construction of the overall deployment of the overall arrangements. Finally on construction safety, environmental protection and civilization of production to do a simple narrative. Thesis detailed presentation of the main projects of the construction methods and construction technology. Subgrade is the cornerstone of the whole project good or bad, in the roadbed project focuses on the treatment of the subgrade soil, the subgrade soil using a two-tier 15cm limestone soil stability grassroots construction method. Construction prior to do a good job of lime-soil test, mastering the maximum dry density and optimum water content in order to control dose and detection of ash density. At the specific process in lime with particular attention to the digestion time and deal with the seams.
Learn through the construction of this article is the actual construction plays an important role in guiding the construction documents.
Key words: construction organization design, design drawings, tamping experiments, maximum dry density