Variable-cross-section structure for deep sewer of roadbed and construction method thereof

Abstract

The invention discloses a variable-cross-section structure for a deep sewer of a roadbed and a construction method thereof. The variable-cross-section structure consists of a lower small cross-section excavation region (2) and an upper big cross-section excavation region (1) arranged above the lower small cross-section excavation region (2). The operation of an excavator for the deep sewer is achieved by adopting a variable-cross-section sewer structure, and the fast construction of the sewer in a water-rich loose rock and soil body is achieved by the construction method which comprises the steps of prepressing, rock filling and back-excavating and staging and segmenting, so that the damages arising from the local mud drifting or the soil-flowing type collapse of the water-bearing loose rock and soil body and the serious construction safety problems of the damages, possibly caused by excavation disturbance are avoided.

Description

technical field [0001] The invention relates to a structure of a highway subgrade waterproof and drainage structure and a construction method thereof, in particular to a variable section structure of a subgrade deep seepage ditch and a segmental rapid construction method thereof. Background technique [0002] The subgrade seepage ditch is a kind of seepage ditch set under (or next to) the side ditch of the subgrade. It is often used to intercept and drain the interlayer water at the slope toe of the cutting side slope. The bottom of the seepage ditch needs to be buried on the lowermost impermeable layer. For the loose accumulation body coverage and the distribution of slope landslides, the underlying depth of the impermeable layer is often relatively large, so it is often necessary to set a deep seepage ditch with a depth of 5m-8m. When excavating deep seepage trenches, frame supports must be added from top to bottom as they are excavated, and the supports must be gradually ...

AI Technical Summary

Problems solved by technology

According to the conventional seepage ditch structure, when the loose accumulation body is covered and the slope landslide is constructed, in addition to the high construction cost and slow construction progress caused by the frame support construction, when the excavation depth is greater than 3m, the excavation disturbance will cause water-rich loose rock The fluidity of the soil collapses and collapses with excavation, which not only makes it impossible to excavate the seepage ditch, but also brings serious construction safety problems

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