A construction method for pipeline trench excavation

Abstract

The invention relates to a pipeline trench excavation construction method. The method includes the following steps: S1: measuring and setting out the line; S2: trench excavation: digging to the bottom of the trench according to the slope coefficient of the soil slope; S3: reinforcement treatment at the bottom of the trench: Inject calcium chloride solution into the bottom of the trench. After the calcium chloride solution is immersed in the bottom of the trench, inject sodium bicarbonate solution into the trench. The molar ratio of sodium bicarbonate solution to calcium chloride solution is greater than 2; S4: trench Groove drainage: drain the water in the groove; S5: Groove compaction: compact the bottom of the groove, and dry the drained water after compacting the bottom of the groove; S6: Install the drainage pipe: hoist the drainage pipe to the bottom of the groove, And splicing; S7: Backfill soil: backfill with sand and compact it to the original elevation. The gaps in the soil are filled with calcium carbonate generated by the reaction of calcium chloride solution and sodium bicarbonate solution, which reduces the use of gravel or concrete as cushion materials, and relatively reduces the excavation depth after not having to reserve depth for cushion materials .

Description

technical field [0001] The invention relates to the technical field of pipeline installation, in particular to a construction method for excavating a pipeline trench. Background technique [0002] With the continuous expansion of the scale of the city, water supply and drainage pipeline engineering, as one of the infrastructures for urban development, is one of the basic guarantees to promote urban development and meet people's daily needs. [0003] At present, the laying of municipal drainage pipelines includes the following steps: [0004] S1. Measure and pay out: pay out the groove position and the slope line; [0005] S2. Trench excavation: when the depth of the trench is less than 3m, the grading excavation method is adopted, and the grading coefficient is 1:0.5. When the trench depth is greater than 3m, the secondary grading and large excavation method is adopted. The coefficient is 1: 0.5, and steel sheet piles or wood piles are used for support; [0006] S3. Found...

AI Technical Summary

Problems solved by technology

[0010] The above-mentioned existing technical solutions have the following defects: in the foundation pouring step, a large amount of concrete needs to be poured as a cushion, and the material cost is relatively high

And when the trench is excavated, it is necessary to reserve a depth for the concrete cushion, so the trench needs to be excavated deeper, which increases the amount of work

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