Coastal deep excavation roadbed construction drainage structure and construction method therefor

Abstract

Disclosed in the present invention is a coastal deep excavation roadbed construction drainage structure, comprising: water intercepting ditches, each arranged on a corresponding cut slope; a sump pit, arranged on one side of a coastal deep excavation roadbed; and slope surface runoff structures, each arranged on the slope surface of the corresponding cut slope. Each intercepting ditch is provided with a sand sedimentation layer and a water intercepting layer, and the water intercepting layer is located below the sand sedimentation layer. Each slope surface runoff structure comprises a water-proof layer and a spiral flow guide layer; the spiral flow guide layer is provided on the water-proof layer; the water-proof layer and the spiral flow guide layer are integrally formed; a plurality of through holes are formed at intervals in the spiral flow guide layer; a plurality of bolts are matched with a plurality of threaded holes formed in the slope surface of a multi-stage cut slope by means of a plurality of through holes so as to tightly attach the slope surface runoff structures to the slope surfaces of the cut slopes, to form a temporary water intercepting and drainage structure. In the present invention, temporary water interception and permanent drainage are effectively combined, to lead rainwater on a cut top and a slope surface out of a cut, thereby preventing slope instability caused by cut slope erosion, ensuring roadbed stability, and reducing post-construction quality risks.

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