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Excavation method for concrete quality defect of face rockfill dam toe slab during construction period

A technology for face rockfill dams and quality defects, applied in dams, barrages, water conservancy projects, etc., can solve the problems of manual cutting, labor and time-consuming, and achieve the effect of ensuring the construction progress

Active Publication Date: 2011-12-21
POWERCHINA HUADONG ENG COPORATION LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Generally speaking, for the excavated plinth concrete quality defects, the plinth concrete needs to be poured again before the upstream dam body can be filled. In view of the importance of the plinth, in order to prevent the blasting vibration impact, it is not suitable to adopt the method of excavating by blasting, it can only be removed manually, which is labor-intensive and time-consuming

Method used

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  • Excavation method for concrete quality defect of face rockfill dam toe slab during construction period
  • Excavation method for concrete quality defect of face rockfill dam toe slab during construction period
  • Excavation method for concrete quality defect of face rockfill dam toe slab during construction period

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Embodiment Construction

[0017] Such as figure 1 , figure 2 As shown, the construction steps of this embodiment are as follows:

[0018] a. Bend the exposed water-stop copper sheet 1 located at the 5 concrete toe slabs that need to be excavated, and do a good job of protection during the construction period;

[0019] b. Arrange a group of anchor bars 2 with a diameter of 28mm at the joint between the concrete plinth 5 and the dam body 4 to be filled. In order to ensure the anchorage strength, the anchor bars 2 need to go deep into the rock 2m, and the distance between adjacent anchor bars 2 is 1m;

[0020] c. At the junction of the concrete plinth that needs to be excavated and the dam body 4 to be filled, erect the steel formwork 3 welded and fixed with the anchor bar 2 close to the dam body 4 to be filled, wherein the steel formwork 3 is close to the dam body The 4 sides are fixed by internal pulling, and the height of the steel formwork 3 is 60-100cm (the thicker the concrete toe-slab, the high...

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Abstract

The invention relates to a method for excavating out face rockfill dam toe slab concrete with quality defects in the construction period, aiming to avoid the construction period conflict between toe slab concrete quality defect treatment and dam body filling. In a technical scheme for solving the problem, the method comprises the following construction steps: a. bending an exposed water stop copper sheet on a concrete toe slab needing excavation treatment; b. fixedly erecting a steel formwork close to a dam body planned to be filled at the inner side of the concrete toe slab needing excavation treatment; c. filling the upstream body of the dam, excavating out the concrete toe slab with quality defects and pouring new toe slab concrete; d. excavating out part of the dam body near the steelformwork and forming a groove on the surface of the dam body; e. cutting off part of the top of the steel formwork; and f. filling an asphalt sand cushion in the groove formed in the step d. The method is mainly suitable for construction of face rockfill dam toe slabs in the hydraulic and hydroelectric engineering.

Description

technical field [0001] The invention relates to a method for excavating and treating quality defects of face rockfill dam toe slab concrete during construction, which is mainly applicable to projects in which serious quality defects of face face rockfill dam toe slab concrete need to be excavated and have a tight construction period. Background technique [0002] The toe slab of the face rockfill dam in water conservancy and hydropower projects is very important. The mandatory provisions of the code stipulate that the concrete strength grade of the face rockfill dam plinth should not be lower than C25, and the impermeability grade should not be lower than W8. The above requirements must be met during construction. In fact, during the construction of some projects, due to various reasons, the concrete strength and impermeability level of the dam plinth may partially fail to meet the design requirements and need to be excavated. [0003] Generally speaking, for the excavated ...

Claims

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Application Information

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IPC IPC(8): E02B3/16E02B7/06
Inventor 王樱畯黄维
Owner POWERCHINA HUADONG ENG COPORATION LTD
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