Construction method and structure of hydraulic core-wall rockfill dam without cofferdams

A rockfill dam and cofferdam-free technology, which is applied in the field of rockfill dam structure, achieves the effects of simplifying the construction process, reducing the pumping of the foundation pit, and saving the construction period

Active Publication Date: 2014-09-24
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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Problems solved by technology

[0003] The object of the present invention is to provide a new construction method and structure of a rockfill dam that cancels the upstream and downstream cofferdams, so that there is no need to build anti-seepage cofferdams on the upstream and downstream, and it is not necessary to excavate and treat the dam foundation. Excavating materials to solve the technical problems of directly carrying out rockfill dam filling construction without cofferdam protection, so as to save construction time and investment

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  • Construction method and structure of hydraulic core-wall rockfill dam without cofferdams

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] Look figure 1 , the core wall rockfill dam structure without cofferdam of the present invention is a fine rockfill area 2 with an inverted triangle or trapezoidal structure located in the middle of the dam body and an equilateral triangle or trapezoidal structure symmetrically arranged upstream and downstream of the fine rockfill area 2 There is also a transitional rockfill area 3 between the fine rockfill area 2 and the mixed rockfill area 4 upstream and downstream, and a core anti-seepage layer 1 is provided in the middle of the fine rockfill area 2 A large rock slope protection area 5 is provided on the upstream slope of the mixed rockfill area 4 located on the upstream face.

[0024] Step 1: Fill the upstream and downstream mixed riprap area 4. During the construction, directly throw and fill the building excavation stones from th...

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Abstract

The invention discloses a construction method of a hydraulic core-wall rockfill dam without cofferdams. The method comprises the following steps: filling an upstream and downstream mixed riprap area (4); filling a transitional rock filling area (3); filling a fine rock filling area (2); filling an upstream large crushed rock revetment area (5); constructing a core-wall anti-seepage area (1). The invention further discloses a core-wall rockfill dam structure without cofferdams obtained according to the construction method. According to the invention, anti-seepage cofferdams do not need to be constructed on the upstream and the downstream of the dam, and the foundation of the dam does not need to be excavated and processed, so that pumping of foundation pits is reduced, the utilization rate of excavated aggregated rock of buildings is improved, the cofferdams do not need to be dismantled in the later period, the construction technology is simplified, the construction period is shortened, and the engineering investment is saved.

Description

technical field [0001] The invention relates to a cofferdam-free construction method and structure of a hydraulic core rockfill dam, which is particularly suitable for a rockfill dam structure with low water head and wide riverbed, and belongs to the technical field of core rockfill dam construction in water conservancy and hydropower projects. Background technique [0002] In water conservancy and hydropower projects, due to the needs of irrigation water intake or power generation, it is usually necessary to build a dam to form a reservoir. Many dams under construction and proposed to be constructed choose rock-fill dams. Conventional rockfill dams need to build anti-seepage cofferdams upstream and downstream. After the cofferdams are closed, the water in the foundation pit will be drained, and then the foundation excavation and filling construction of the rockfill dam will be carried out. For downstream cofferdams, especially large and medium-sized projects with wide river...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/18
Inventor 田业军龙起煌湛正刚熊忠明蔡大咏童文辉张合作程瑞林
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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