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Water-retaining cofferdam mode used in case of difficult implementation of heavy excavation method

A cofferdam, the largest technology, applied in the field of water-retaining cofferdam types, can solve problems such as difficulties in excavating concrete longitudinal cofferdam foundations, hidden dangers of project power generation on time, failure to meet project progress requirements, etc., to meet construction progress requirements, Improve the ability of shear transmission and ensure the effect of safety and stability

Inactive Publication Date: 2009-10-21
POWERCHINA ZHONGNAN ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This innovative method uses an improved system for constructing temporary structures such as cemeteries or buildings during drilling operations. By utilizing this new approach, difficulties with arranging bases may have been overcome without requiring expensive equipment. After finishing drill holes, there'll also save money while maintaining their strength and integrity. Overall, these technical improvements make building constructions more efficient and cost-effective than traditional methods like brick walls.

Problems solved by technology

The present technology described by this patents describes different methods for constructing temporary cathode ray shield systems at basement sites during hydroelectric power plant operations without damaging surrounding areas such as roads near them. However, current techniques require multiple steps involving digging up around obstacles like pipes and create space between the soil layers below. This can lead to difficulties with excavating the necessary depths of ground before placing the cathodeside foundation system.

Method used

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  • Water-retaining cofferdam mode used in case of difficult implementation of heavy excavation method
  • Water-retaining cofferdam mode used in case of difficult implementation of heavy excavation method
  • Water-retaining cofferdam mode used in case of difficult implementation of heavy excavation method

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Embodiment Construction

[0018] The scale of a large-scale hydropower station project is huge, the engineering geological conditions of the dam site are complex, and the river valley is relatively narrow. Stage diversion is adopted and the diversion flow is large. Add any supporting measures, and directly excavate the cover layer of the second-stage longitudinal weir under the protection of the first-stage earth-rock cofferdam (that is, the large-scale excavation method). The horizontal width of the side slope of the first-stage foundation pit is about 90m-120m, and it has completely occupied the position of the second-stage vertical weir on the plane, and it exceeds the right line of the front of the diversion bottom hole used for the second-stage discharge (see figure 1 ), therefore, support measures must be taken in order to achieve the purpose of excavating all the foundation covering layer of the second-stage vertical weir in the first-stage foundation pit and then pouring the weir body concrete. ...

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Abstract

The invention relates to a water-retaining cofferdam mode in water and electricity construction. The water-retaining cofferdam comprises post-poured concrete and open caisson group, wherein, reserved clearances are arranged among open caissons, the bottoms of open caissons are covered and opening locking piles are arranged among open caissons. The invention has reasonable design and reliable structure, completely combines excavation support with cofferdam structure, not only saves investment but also meets the requirement of construction progress, and is a better covering layer-treating mode and a cofferdam mode when the heavy excavation scheme is unfeasible.

Description

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Claims

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Application Information

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Owner POWERCHINA ZHONGNAN ENG