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Construction method for concrete diaphragm wall cofferdam heightening

A concrete anti-seepage wall and construction method technology, applied in the direction of basic structure engineering, construction, etc., can solve problems such as the need for repair of cofferdam body sections, achieve the effect of reducing the requirements of construction conditions and high processing efficiency

Active Publication Date: 2014-12-10
GEZHOUBA GROUP FOUND ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a construction method for raising the height of the concrete cut-off wall cofferdam body. High or damaged cofferdam body sections need to be repaired, and achieve the purpose of fast, efficient and economical construction

Method used

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Embodiment

[0022] The cofferdam at the outlet of the diversion tunnel on the left bank of a hydropower station was originally treated with a concrete anti-seepage wall. After considering the construction period requirements of the overflow node, the height of the weir top of the cofferdam during the dry season of the outlet was designed to be heightened and adjusted by geomembrane anti-seepage treatment. During the flood season, due to the surge in flow, the side of the cofferdam near the river suffered settlement and deformation. In order to ensure the overall stability of the cofferdam and avoid further expansion of the damage to the cofferdam, the broken weir was filled with hydraulic pressure. After the cofferdam body was broken and filled with water, part of the cofferdam body section was damaged. The maximum gap width was about 50m, and the maximum depth was about 16m. Secondary cofferdam filling and anti-seepage treatment were required. After researching and comparing plans from t...

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Abstract

Disclosed is a construction method for concrete diaphragm wall cofferdam heightening. The method includes the following steps that (1) a cofferdam is filled with ballast to the design elevation; (2) a geological drilling rig is adopted for drilling an exploratory hole, the depth of an original concrete diaphragm wall is probed, and the depth of a high-pressure jet grouting hole is determined; (3) the high-pressure jet grouting hole is drilled; (4) a spray pipe is placed downwards to the hole bottom for high-pressure rotary grouting; (5) drilling and spraying are carried out in rows and in order; (6) dense supplemental grouting holes are drilled. By means of the construction method for concrete diaphragm wall cofferdam heightening, the technical aim of concrete diaphragm wall cofferdam heightening or repairing of damaged cofferdam sections can be achieved, effective lap joint of two different anti-seepage systems is achieved, and the purposes of rapid construction, economical efficiency and high efficiency are achieved.

Description

technical field [0001] The invention belongs to the technical field of anti-seepage wall cofferdam body construction, and in particular relates to a treatment method for heightening a concrete anti-seepage wall cofferdam body or repairing a damaged cofferdam body section. Background technique [0002] With the increasing depth of hydropower development, the conditions for dam construction are becoming more and more complex. In particular, the western hydropower stations, which are key constructions, are located on plateaus, with high mountains and deep valleys, and most of them are elderly in turbulent gorges. The performance requirements for water-retaining and seepage-proof cofferdams are getting higher and higher. After the water-retaining and anti-seepage cofferdams pass through the flood season, sometimes the anti-seepage cofferdam body needs to be heightened or the damaged cofferdam body section needs to be repaired, and secondary cofferdam filling and anti-seepage tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/04
Inventor 童耀焦家训常福远张玉莉
Owner GEZHOUBA GROUP FOUND ENG
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