1.沟槽开挖。

1. Trench excavation.

(1)混凝土路面和沥青路面的开挖应使用切割机切割。

(1) The excavation of concrete pavement and asphalt pavement shall be cut by cutting machine.

(2)管道沟槽应按设计规定的平面位置和标高开挖。当采用人工开挖且无地下水时，槽底预留值应为0.05~0.10m;管道安装前应人工清底设计标高。

(2) The pipe trench shall be excavated according to the plane position and elevation specified in the design. When manual excavation is adopted and there is no underground water, the reserved value at the bottom of the trench shall be 0.05~0.10m; Before pipeline installation, the bottom shall be cleaned manually to the design elevation.

(3)管沟沟底宽度和工作尺寸，应根据现场实际情况和管道敷设方法确定。

(3) The width and working size of the trench bottom shall be determined according to the actual situation on site and the pipeline laying method.

(4)局部超挖部分应回填夯实。当沟底无地下水时，超挖在0.15m以内，可采用原土回填;超挖在0.15,以上，可采用石灰土处理。当沟底有地下水或水量较大时，应采用级配砂石或天然砂回填标高。超挖部分回填后压实，其密实度应接近原地基天然土的密实度。

(4) The partial overbreak shall be backfilled and compacted. When there is no groundwater at the bottom of the ditch, the over-excavation is within 0.15m, and the original soil can be used for backfilling; If the overbreak is more than 0.15, lime soil can be used for treatment. When there is groundwater at the bottom of the ditch or there is a large amount of water, graded sand or natural sand shall be used to backfill to the elevation. The over-excavated part shall be compacted after backfilling, and its compactness shall be close to the compactness of the original foundation natural soil.

(5)在湿陷性黄土地区，不宜在雨期施工，或在施工时切实排除沟内积水，开挖时应在沟底预留值0.03~0.06m厚的土层进行压实处理。

(5) In the collapsible loess area, construction should not be carried out in rainy season, or the accumulated water in the ditch should be effectively drained during construction. During excavation, a soil layer with a thickness of 0.03-0.06m should be reserved at the bottom of the ditch for compaction.

(6)沟底遇有废弃构筑物、硬石、木头、垃圾等杂物时须，并应铺一层厚度不小于0.15m砂土或素土，整平压实及设计标高。

(6) In case of waste structures, hard rocks, wood, garbage and other sundries at the bottom of the ditch, they must be removed, and a layer of sand or plain soil with a thickness of not less than 0.15 m should be paved, leveled and compacted to the design elevation.

(7)对软土基及特殊腐蚀土壤，应按设计要求处理。

(7) Soft soil foundation and special corrosive soil shall be treated according to design requirements.

2.回填土。

2. Backfill.

(1)不得采用冻土、垃圾、木材及软性物质回填。管道两侧及管顶以上0.5m内的回填土，不得含有碎石、砖块等杂物，且不得采用灰土回填。距管顶0.5m以上的回填土中的石块不得多于10%、直径不得大于0.1m,且均匀分布。

(1) Frozen soil, garbage, wood and soft materials shall not be used for backfilling. The backfill on both sides of the pipe and within 0.5m above the pipe top shall not contain debris such as gravel and bricks, and shall not be backfilled with lime soil. The stones in the backfill soil more than 0.5m from the pipe top shall not be more than 10%, and the diameter shall not be more than 0.1m, and shall be evenly distributed.

(2)沟槽的支撑应在管道两侧及管顶以上0.5m回填完毕并压实后，在保证的情况下进行拆除，并应采取细砂填实缝隙。

(2) The support of the trench shall be removed under the condition of ensuring safety after backfilling and compaction on both sides of the pipe and 0.5m above the pipe top, and the gap shall be filled with fine sand.

(3.)沟槽回填时，应先回填管底悬空部位，再回填管道两侧。

(3) When backfilling the trench, the suspended part of the pipe bottom shall be backfilled first, and then both sides of the pipe shall be backfilled.

(4)回填土应分层压实，每层虚铺厚度宜为0.2~0.3m，管道两侧及管顶以上0.5m内的回填土须采用人工压实，管顶0.5m以上的回填土可采用小型机械压实，每层虚铺厚度宜为0.25~0.4m。

(4) Backfill soil shall be compacted by layers. The virtual paving thickness of each layer should be 0.2~0.3m. Backfill soil on both sides of the pipeline and within 0.5m above the pipe top must be compacted manually. Backfill soil above 0.5m above the pipe top can be compacted by small machinery. The virtual paving thickness of each layer should be 0.25~0.4m.

(5)回填土压实后，应分层检查密实度，并做好回填记录。

(5) After the backfill is compacted, the compactness shall be checked layer by layer and the backfill records shall be made.

3.警示带铺设。

3. Laying of warning tape.

(1)埋设燃气管道的沿线应连续铺设警示带。警示带铺设前应将铺设面压实，并平整的铺设在管道的正上方，距管定的距离宜为0.3~0.5m，但不得铺设于路基和路面内。

(1) Warning tapes shall be laid continuously along the buried gas pipeline. Before laying the warning tape, the paving surface should be compacted and laid flat above the pipe. The distance from the pipe should be 0.3~0.5m, but it should not be laid in the roadbed and pavement.

(2)警示带宜采用黄色聚乙烯等不易分解的材料，并印有明显、牢固的警示语，字体不应小于100*100mm。

(2) The warning tape should be made of yellow polyethylene and other materials that are not easy to decompose, and should be printed with obvious and firm warning words. The font should not be less than 100 * 100mm.

现在的警示带有示踪线，利用测试仪器在不开挖的情况下，准确为管道定位。您有需求就来我们网站http://www.lnszgh.com咨询了解吧！

The current warning is equipped with a tracer line, which uses test instruments to accurately locate the pipeline without excavation. Come to our website if you need http://www.lnszgh.com Ask about it!