Seepage and collapse prevention structure for foundation filling of drainage pipeline and construction method of seepage and collapse prevention structure

Abstract

The invention discloses a seepage and collapse prevention structure for foundation filling of a drainage pipeline and a construction method of the seepage and collapse prevention structure. The seepage and collapse prevention structure for foundation filling comprises a gravel foundation layer, a gravel foundation trench layer and a clay layer which are sequentially formed in a filling manner from bottom to top. The drainage pipeline is laid on the gravel foundation layer. A grouting pipe is anchored into the gravel foundation trench layer. Clay grout is injected into the gravel foundation layer and the gravel foundation trench layer through grouting holes in the grouting pipe. Clay is a soil body with cohesive force, the self-stabilization capacity is high, a hollow soil arch can be formed, and the soil body can be effectively prevented from being washed off. Besides, the drainage pipeline is wrapped with the clay sand layer with the water insulation capacity, rainwater and wastewater of the drainage pipeline are prevented from leaking out and polluting passing underground water, the underground water can be prevented from seeping into the drainage pipeline and being lowered in water level, and it is avoided that the underground water is mixed with the rainwater and wastewater and consequently the processing amount of a sewage plant is increased.

Description

technical field [0001] The invention relates to the technical field of municipal drainage pipeline construction engineering, in particular to a drainage pipeline foundation filling anti-seepage and anti-collapse structure and a construction method thereof. Background technique [0002] At present, most of the foundations of the known municipal drainage pipelines are sand foundations, and the backfilling of foundation trenches is mainly sand and gravel, all of which have obvious safety hazards and limitations. Disadvantages of the existing drainage pipeline sandstone foundation and sandstone backfill foundation groove technology: the pipeline adopts sandstone foundation and sandstone backfill foundation groove, although the sandstone foundation has the advantages of high bearing capacity and low compressibility after vibration density, it can be used for pipelines. It provides sufficient bearing capacity, and the post-construction settlement is small, which controls the probl...

AI Technical Summary

Problems solved by technology

[0002] At present, the foundations of the known municipal drainage pipelines are mostly sand and gravel foundations, and the backfilling of foundation trenches is also dominated by sand and gravel, which has obvious safety hazards and limitations.

Disadvantages of the existing drainage pipeline sandstone foundation and sandstone backfill foundation groove technology: the pipeline adopts sandstone foundation and sandstone backfill foundation groove, although the sandstone foundation has the advantages of high bearing capacity and low compressibility after vibration density, it can be used for pipelines. Provide sufficient bearing capacity, small post-construction settlement, and control the banded settlement problem along the road surface of the foundation trench

[0003] However, sand and gravel have strong permeability and no cohesion. Once the pipeline encounters factors such as lax construction of the pipeline interface, damage to the interface, poor treatment of the pipe foundation, sudden changes in geological conditions, changes in upper loads, and excessive loads, etc., uneven settlement and deformation will occur. , interface deformation, pipe cracking, gaps, etc.; among the sandstone materials with strong permeability and no cohesion around the pipe, relatively small particles are easily lost into the pipe through the gap, and the ground subsides due to the loss of soil particles In addition, the sand layer is a strong water-permeable layer, and the sandstone foundation groove around the pipeline forms a strong water-permeable channel. Since the groundwater flows into the deep-buried pipeline through the sand foundation groove and is drained away, the surrounding groundwater level is reduced, which will also cause ground subsidence ( Note: the effect is similar to groundwater overexploitation, the formation of funnels and collapses)

Images