Construction method of overlay layer for aging repair of asphalt concrete anti-seepage panel

Abstract

The invention relates to an overlay construction method for repairing an aged asphalt concrete seepage-prevention face plate. The overlay construction method for repairing the aged asphalt concrete seepage-prevention face plate is quick and convenient to construct and low in investment, disturbance damage of a dam body is decreased, and the safety and reliability of engineering operation are improved. According to the technical scheme, the dam body is sequentially provided with a rock pile body, a transition layer and a cushion layer, a leveling adhesion layer is laid on the cushion layer, the aged asphalt concrete face plate is laid on the adhesion layer, and a bottom triangle is formed between the leveling adhesion layer and the aged asphalt concrete face plate. A concrete cover plate is arranged at the front end of the bottom triangle, and a seepage-prevention wall is vertically arranged under the concrete cover plate. The overlay construction method comprises the following steps of (a) surface cleaning and joint filling, (b) glass fiber geogrid laying, (c) copper waterstop embedding, (d) concrete toe board casting, (e) consolidation grouting, (f) concrete connection plate casting, (g) new concrete face plate casting and (h) surface layer water stop construction.

Description

technical field [0001] The invention relates to an overlay construction method for aging repair of asphalt concrete anti-seepage panels, which is mainly suitable for repairing aged asphalt concrete anti-seepage panels and similar projects. Background technique [0002] my country began to use asphalt concrete as the anti-seepage face of earth-rock dams in the early 1970s, and it has been nearly 40 years; according to the research results of asphalt concrete aging at home and abroad: There are different degrees of aging phenomena; after more than 30 years of operation, the aging of the asphalt concrete anti-seepage layer will greatly reduce the physical and mechanical properties of the material, seriously affecting the safe operation of the project, and engineering measures need to be taken to repair it. A batch of asphalt concrete face rockfill dams built in the late 1970s and early 1980s in my country have been in operation for more than 30 years. The aging of the asphalt ha...

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Problems solved by technology

[0003] The above repair methods have certain limitations. The methods adopted in Europe and other countries are mainly suitable for projects with short service life and controllable aging degree of asphalt concrete slabs; while the repair methods adopted in some projects in my country are complex in construction, large in investment, and require a lot of time before demolition. In the process of anti-seepage body, it will cause great interference and damage to the dam body whose original settlement has been completed, and affect the repair effect of the project

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