A Drainage Structure and Construction Method for Restoring Foundation Pit with Lining of Underwater Canal and Dry Ground

Abstract

The invention discloses a foundation pit drainage structure and construction method for repairing foundation pits by lining dry land under uninterrupted water delivery. 3); a cofferdam (4) is provided on the water channel (1), and the cofferdam (4) and the lining board (2) form a dry foundation pit (5), and each of the permeable hoses The ends of (8) are all provided with check valves (9), and stoppers (10) are installed on the removed check valves (9) on the periphery of the dry foundation pit (5). A submersible pump (11) is installed on the non-return valve (9) between the occluder (10) and the edge of the cofferdam (4); The system is damaged, and in severe cases, it will cause slope instability and affect the safe operation of the channel. It has the advantages of cofferdam maintenance and dry land repair of the channel lining board.

Description

technical field [0001] The invention belongs to the technical field of construction diversion of water conservancy and hydropower projects, and more specifically relates to a foundation pit drainage structure and a construction method for repairing a foundation pit drainage structure without interrupting the lining of a channel under water delivery. Background technique [0002] In order to solve the imbalance of regional water resources, there are more and more water transfer projects in our country. With the completion and operation of the project, the water delivery channel is affected by various factors such as channel water level changes, drainage system operation conditions, freeze-thaw, construction quality, etc., and the concrete lining board may be damaged in the form of cracking, collapse, anti-floating instability, etc. , to a certain extent, it will lead to the increase of local head loss of the channel, the damage of the anti-seepage system, and in severe cases,...

AI Technical Summary

Problems solved by technology

With the completion and operation of the project, the water delivery channel is affected by various factors such as channel water level changes, drainage system operation conditions, freeze-thaw, construction quality, etc., and the concrete lining board may be damaged in the form of cracking, collapse, anti-floating instability, etc. , to a certain extent, it will lead to the increase of local water head loss in the channel, the damage of the anti-seepage system, and in severe cases, the instability of the slope, which will affect the safe operation of the channel.

[0003] For large-scale water diversion projects, such as the middle route project of South-to-North Water Diversion Project that has been put into operation, it is mainly responsible for the task of supplying water to residents and industrial production in Beijing, Tianjin, and large and medium-sized cities along the canal in Hebei and Henan Provinces. Once the water supply is interrupted, it will affect a wide range of people. great social impact

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