During excavation, if a gas warning tape is dug, it means that there is a gas pipeline 0.3 to 0.5 meters below, which plays a role of warning and protection. Do you know the operation of trench excavation and backfill of gas pipeline warning tape?

Trench excavation

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

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

(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) The partially over excavated part 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 the water volume is large, graded sand or natural sand should be used to backfill to the elevation. The over excavated part shall be backfilled and compacted, and its compactness shall be close to that of the natural soil of the original foundation.

(5) In the collapsible loess area, it is not suitable to construct in the rainy season, or effectively remove the ponding in the ditch 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) Waste structures, hard stones, wood, garbage and other debris at the bottom of the ditch must be removed, and a layer of sandy soil or plain soil with a thickness of not less than 0.15m shall be paved, leveled, compacted and designed elevation.

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

back fill

(1) Frozen soil, garbage, wood and soft materials shall not be used for backfilling. The backfill on both sides of the pipeline and within 0.5m above the pipe top shall not contain debris, bricks and other debris, and shall not be backfilled with lime soil. The stones in the backfill soil above 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) The support of the trench shall be backfilled and compacted on both sides of the pipe and 0.5m above the pipe top, and then removed under the condition of ensuring safety, and the gap shall be filled with fine sand.

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

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

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

The above is all about the problems and precautions introduced to you today. I hope it can help you. If you want to know more, you can contact us by phone or follow our website http://webtest2.daoshangbao.cn , our staff will contact you in time.