Construction method and structure for preventing differential settlement of concrete facing dam plinth

Abstract

The invention discloses a construction method and structure for preventing differential settlement of a concrete facing dam plinth. The method comprises the following construction steps of covering layer foundation construction, concrete anti-seepage wall construction, basic leveling layer construction, cushion plate construction, copper sheet waterstop construction, concrete plinth construction, concrete surface plate construction, concrete connecting plate construction, top layer flexible waterstop construction and acceptance. According to the structure that a cushion layer plate is arranged at the contact position of a connecting plate and the plinth, uneven deformation between structures caused by basic deformation can be controlled, the effect is obvious, design is simple, construction is convenient, and the structure is reliable. The construction period can be arranged more flexibly, a user does not need to worry about the impervious body damage problem caused by inconsistent deformation of the connecting plate and the plinth, and the project duration can be saved to a certain degree. Meanwhile, a prefabricated structure can be adopted by the novel structure, and therefore the project duration is saved, and the manufacturing cost is low. The flatness and appearance of a bottom copper sheet waterstop can be protected against contamination, and the reliability of the construction quality of the structure is improved.

Description

technical field [0001] The invention relates to a construction method and structure for preventing uneven settlement of a face dam toe slab, belonging to the technical field of water conservancy and hydropower engineering. Background technique [0002] For areas with deep overburden layers, if the retaining dam is built after digging out the overburden layer in the conventional way, it will undoubtedly have a great impact on the diversion, construction period and investment of the project, and directly affect the main economic indicators of the project. The slab is built on the cover layer, and the cover layer foundation is treated with a concrete cut-off wall. Since there is no need to excavate the river bed cover layer, compared with the damming technology on the bedrock, it can not only save the amount of engineering, but also simplify the construction. Diversion, shortening the construction period, has obvious economic benefits. Therefore, the construction of face dams ...

AI Technical Summary

Problems solved by technology

[0004] In operation, since the dam body and the covering layer, and the toe plate and cut-off wall are two types of structures with great differences in mass and stiffness, the deformations during construction and water storage are very different, and the toe plate and the connecting plate are both located On the foundation of the covering layer, although backfill transition materials and mortar are used, due to the thick covering layer, the effect of water load after water storage often leads to large dislocation deformation between the connecting plate and the plinth. Cracks, forming leakage channels

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