Underwater construction method suitable for repairing large-scale water delivery channels without stopping water

Abstract

The invention discloses an underwater construction method suitable for repairing large-scale water delivery channels without stopping water. The first step is to set up an underwater steel fence to enclose the repair area to form a still water area, so that the inside and outside of the steel fence The water pressure is balanced and the water flow is still; the second step, underwater soil excavation: in the still water area enclosed by the steel fence, use the underwater excavation device to excavate the repair area from bottom to top along the slope ; After the excavation of a repair station is completed, move the underwater excavation device to another repair station for excavation until the repair area is completely excavated; the third step, in the repair area after excavation Inside, the underwater restoration is done by pouring underwater formwork concrete or / and underwater non-dispersible concrete. The invention adopts the assembled steel enclosure to form the still water area, which reduces the difficulty of underwater construction and avoids the pollution of the water quality of the channel by the underwater construction. The underwater excavation mechanical device greatly improves the efficiency and accuracy of underwater soil excavation, and reduces the difficulty of underwater soil excavation.

Description

technical field [0001] The invention relates to a method for repairing a water delivery channel without stopping water, in particular to an underwater construction method suitable for repairing a large water delivery channel without stopping water. Background technique [0002] At present, direct repairs can be adopted for the damaged part of the water works of the water delivery channel, and the method of repairing the damage of the underwater works is generally adopted. In this way, dry land construction can be realized after the water is cut off, the construction speed is fast, the efficiency is high, and the construction quality is easy to be guaranteed. However, it takes a long time to repair the entire section of the channel without water, which seriously affects the water delivery capacity of the channel, resulting in the inability to fully utilize the benefits of the water delivery channel. For some areas with a single water source, the entire section of the water su...

AI Technical Summary

Problems solved by technology

However, it takes a long time to repair the entire section of the channel without water, which seriously affects the water delivery capacity of the channel, resulting in the inability to fully utilize the benefits of the water delivery channel. For some areas with a single water source, the entire section of the water supply has a great social impact

[0003] By setting up large cofferdams to form local still water areas, local water cutoffs can be realized for underwater repairs, but the current shortcomings are: 1. The traditional cofferdam structure is complex, and the investment is high and the implementation is difficult.

2. The accuracy of underwater excavation is difficult to control. In order to ensure the accuracy of excavation, divers need to wait until the underwater excavation stops and the water quality is clear before diving to check and confirm the excavation situation. The excavation efficiency is low

3. When excavating underwater, it is necessary to combine high-pressure water guns and hinged suction dredge pumps for the excavation of underwater compacted and hardened soil; for the consolidated clay that cannot be stirred by the hinged suction dredger pump, 35MPa should be used. The high-pressure water will wash away the clay and then use the dredge pump to clean it, which is difficult to construct; and for the excavation of pebble soil with large particle size, the hinged suction dredge pump is not suitable, and only the long-arm backhoe is used for excavation. The equipment is used for underwater excavation; however, the long-arm backhoe excavation equipment needs to be equipped with a platform on the land base, but the effective excavation distance and the large dead weight of the long-arm backhoe restrict its scope of application

Images