Parting water-stop design method of concrete cast-in-situ diaphragm wall of deep overburden layer dam foundation

Abstract

The invention discloses a parting water-stop design method of a concrete cast-in-situ diaphragm wall of a deep overburden layer dam foundation. The method comprises the steps that firstly, a perpendicular linkage joint between adjacent sections of the concrete cast-in-situ diaphragm wall is arranged as a fold line joint of a structure shaped like a Chinese character 'tu', and construction scabbling is conducted on the joint; secondly, a copper water-stop plate with the section being of a W-shaped structure is arranged at the position, located on the axis of the diaphragm wall, of the fold line joint, wherein the copper water-stop plate is perpendicular to the fold line joint, and a middle convex body cavity of the copper water-stop plate with the section being of the W-shaped structure is filled with a chloroprene rubber bar; thirdly, a GB three compound rubber water-stop plate is attached to the upstream side of the vertical linkage joint of the adjacent sections of the concrete cast-in-situ diaphragm wall, fixed through stainless steel expansion bolts, and then brushed with 3 mm emulsified asphalt in a covered mode. The method has the advantages that the service life of the concrete cast-in-situ diaphragm wall is prolonged.

Description

technical field [0001] The invention relates to a face-face dam or an earth-rock dam foundation anti-seepage wall with a deep overburden layer, in particular to a design method for joint water-stopping of a concrete cast-in-place anti-seepage wall for a deep overburden dam foundation. Background technique [0002] Concrete cut-off walls are often chosen as one of the main measures in anti-seepage of high-face dams with deep overburden layers or foundations of earth-rock dams. During construction, the slotted anti-seepage wall is driven into the covering layer and inserted into the bedrock. At the joint between the top of the slotted anti-seepage wall and the toe board or connecting plate of the face dam, it is necessary to construct a concrete anti-seepage wall to ensure its tightness. Connection, in order to prevent water penetration under the action of high water head. Since the cast-in-place anti-seepage wall is constructed in sections, vertical joints need to be constru...

AI Technical Summary

Problems solved by technology

For low dams (below 30 meters in height), crease joints are used instead of water-stopping facilities in the joints, and the joint surfaces between the joints are chiseled; Seepage panels leak at joints

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