Rock-fill concrete dam construction joint impervious structure and construction method thereof

Abstract

The invention provides a rock-fill concrete dam construction joint impervious structure which comprises lower-layer rock-fill concrete and a lower-layer impervious area arranged on one side of the lower-layer rock-fill concrete; a waterstop is arranged in the middle of an upstream impervious area on each-layer construction joint surface of a rock-fill concrete dam and is embedded in lower-layer concrete and upper-layer concrete, so that interlayer water seepage of the rock-fill concrete dam construction joint surface can be effectively prevented, influence of the interlayer water seepage to the durability of the dam concrete and the project appearance quality is avoided, a foundation is laid for building a water-tight dam, the phenomenon that the dam downstream surface has interlayer waterseepage after reservoir filling is eliminated, and the problem that the construction joint surface has water seepage is solved; on the premise of meeting the equivalent effect, the rock-fill concretedam construction joint impervious structure is simple in structure and construction technology, high in construction speed and does not need special material; and the adopted galvanized iron sheet islow in cost, light in weight, energy-saving and environmentally-friendly; and the project investment is saved compared with the traditional technology.

Description

technical field [0001] The invention relates to a construction joint anti-seepage structure of a rock-fill concrete dam and a construction method thereof, belonging to the technical field of rock-fill concrete dams. Background technique [0002] Rockfill concrete is a new type of concrete proposed by Tsinghua University, and it is a new type of mass concrete construction method developed on the basis of self-compacting concrete technology. It first puts the large-sized rockfill directly into the silo to form a rockfill body with voids, and then pours specially developed low-heat of hydration low-cost self-compacting concrete from the upper part of the rockfill body, utilizing the high flow resistance of the self-compacting concrete Segregation performance enables self-compacting concrete to be filled into the voids of rockfill by its own weight to form a complete, dense, high-strength, low-heat of hydration, low-shrinkage large-volume concrete. [0003] The rockfill concret...

AI Technical Summary

Problems solved by technology

[0004] In construction practice, the layered rockfill of rockfill concrete cannot avoid the crushed stone powder and crushed stone falling on the horizontal construction joint surface during the rockfill process. The crushed stone powder and crushed stone are located at the bottom of the rockfill and cannot Clean up, resulting in poor bonding of construction joint surfaces after concrete pouring

In addition, during the concrete pouring process, if the concrete is forced to stop pouring due to other reasons, the surface treatment of the warehouse can only be done by chiseling or roughening the concrete in the anti-seepage area on the upstream and downstream sides, and the rockfill concrete area in the middle cannot be treated, which also increases The possibility of water seepage between layers of concrete construction joints is eliminated, so after the reservoir is impounded, water seepage between layers occurs from time to time on the downstream surface of the dam

After the completion of the dam, interlayer water seepage is often difficult to deal with. Even if it is expensive to deal with, it is difficult to achieve the desired effect. At the same time, interlayer water seepage leads to a decrease in the durability of concrete and seriously affects the appearance of the project.

Traditional rockfill concrete dams use the method of setting anti-seepage layers on the upstream and downstream surfaces of the dam body to deal with interlayer seepage. The construction process of the anti-seepage layer is relatively complicated, the comprehensive cost is high, and the requirements for on-site quality control are high, so it is often difficult to adopt it in engineering construction.

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