Construction Method of Longitudinal Strengthening of Earth-rock Dam

Abstract

The present invention discloses an earth and rockfill dam longitudinal reinforcement construction method. The method includes the following steps that: a portion of an earth and rockfill dam, which is required to be reinforced, is vertically dug, so that a grouting groove can be formed; steel trusses are fabricated; a curtain is machined at the center of the bottom of the grouting groove; the bottommost steel truss is arranged in the grouting groove and is erected on an earth and rockfill dam; after the butt joint of all the steel trusses is completed, the steel trusses are sunk; sealing treatment is performed on pre-embedded pipes at a top wall body; a pouring conduit is installed in the grouting groove from top to bottom; concrete is poured into the grouting groove through the pouring conduit, and after being discharged from the pouring conduit, the concrete fills the grouting groove and wall body pre-embedded pipes from bottom to top; after the grouting groove is filled, the pouring conduit is taken out or is not taken out from the grouting groove, after the concrete is solidified, construction is completed. According to the earth and rockfill dam longitudinal reinforcement construction method, a longitudinal reinforcement body is constructed in the dam body of the earth and rockfill dam, so that a solid seepage-proofing wall can be formed in the dam body; and the wall body of the wall is formed by plastic concrete or clay concrete, the wall bottom of the wall is formed through using curtain grouting, and therefore, a complete seepage-proofing system can be formed, and the seepage-proofing system has a water-blocking and seepage-proofing function, a force bearing function and a deformation resisting function.

Description

technical field [0001] The invention relates to an earth-rock dam reinforcement construction method, in particular to a longitudinal reinforcement construction method of an earth-rock dam with three functions of water-retaining and anti-seepage, force bearing and deformation resistance. Background technique [0002] Earth-rock dam is the oldest type of dam in the world. It has a long history of construction. It has the advantages of loose foundation requirements, simple and convenient construction, strong adaptability, good seismic performance and reliable operation. type. Most of the dam materials used in the construction of earth-rock dams are local materials such as earth, stone, sand and gravel or earth-rock mixture, so the cost is relatively cheap. [0003] Compared with concrete dams (such as concrete gravity dams, arch dams, buttress dams, etc.), the safety and reliability of earth-rock dams are more risky. The number of dam failures is the largest, accounting for 7...

AI Technical Summary

Problems solved by technology

These dams have the following three problems: 1. The construction period is relatively long: most of them were trilateral projects built in the 1960s and 1970s. The longer the age, the higher the risk, and there are painful lessons from dam failures in history; 2. Construction standards Low: At that time, the masses worked hard, there was basically no uniform standard, the construction was independent and simple, and the quality control was not strict (the materials used were not strict, the filling was not strict, and the requirements were not strict); 3. Poor operation management: there were systemic, There are many problems in terms of personnel responsibility and personnel quality. Many dams have various degrees of dangers such as leakage, cracking, piping, and landslides. If they are not reinforced in time, they may cause serious damage such as dam collapse.

Due to the leakage of the dam body, the downstream water level rises, making it easy for termites to build nests and reproduce, destroying the integrity of the dam body, forming piping channels, and adversely affecting the stability of the dam body

In view of the leakage, landslide and cracking problems in the dam body, grouting is often used for reinforcement and repair at present. However, due to the concealment of the grouting project, the difficulty of controlling the uniformity of the grouting, and the large influence of human factors in the construction operation, it is often difficult to ensure the grouting. Quality, so the grouting project is often regarded as a "conscience project"

[0005] Traditional concrete anti-seepage walls are generally built in the overburden foundation, and repair construction is difficult; although traditional asphalt core walls or plastic concrete core walls are built in dams, they are all flexible materials with a stiffness close to that of earth dam materials, and it is difficult to resist Tensile stress at the bottom of the wall, inconvenient to use in reinforcement and repair of earth-rock dams

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