A composite cofferdam and its construction method

Abstract

The invention discloses a combined cofferdam and a building construction method of the combined cofferdam, and relates to the technical field of hydraulic engineering construction. The problem that earth and rock are likely to be washed away by rivers so as to pollute downstream river water according to existing combined cofferdams is solved. According to the key points of the technical scheme, the combined cofferdam comprises two rows of steel pipe piles inserted into a soil layer at the bottom of a river way side by side, concrete piles formed after the steel pipe piles are filled with concrete, a water partition plate arranged between two corresponding steel pipe piles in the same row for connecting the two steel pipe piles together, and earth-rock blocks formed after the two rows of steel pipe piles are filled with earth and rock. The building construction method comprises the step a of inserting of the steel pipe piles, the step b of inserting of reinforcing pipe piles, the step cof drainage, the step d of settling of steel reinforcement cages, the step e of filling of concrete, the step f of welding of the water partition plate, the step g of welding of a connection plate and the step h of filling of earth and rock. The impact resistance effect of the earth-rock cofferdam can be improved through water partition plate protection, therefore, influences of earth and rock onthe water quality of downstream rivers are reduced, and the blocking effect of the cofferdam on waterflow can be ensured.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering construction, more specifically, it relates to a combined cofferdam and its construction method. Background technique [0002] The earth-rock cofferdam is a kind of cofferdam formed by earth-rock weiring. The earth-rock cofferdam can use the excavation waste slag, and can directly use the excavation and transportation equipment of the main project for mechanized rapid construction. It is widely used in my country. It is a form of cofferdam, but earth-rock cofferdam also has the problems of low erosion resistance and large area; concrete cofferdam is mainly used in water conservancy projects built on rock foundation soil, and the characteristic of this cofferdam is water retention The water head is high, the bottom width is small, and the anti-scouring capacity is large, but the cost of concrete cofferdams is relatively high; therefore, a composite cofferdam of concrete cofferda...

AI Technical Summary

Problems solved by technology

[0002] The earth-rock cofferdam is a kind of cofferdam formed by earth-rock weiring. The earth-rock cofferdam can use the excavation waste slag, and can directly use the excavation and transportation equipment of the main project for mechanized rapid construction. It is widely used in my country. It is a form of cofferdam, but earth-rock cofferdam also has the problems of low erosion resistance and large area; concrete cofferdam is mainly used in water conservancy projects built on rock foundation soil, and the characteristic of this cofferdam is water retention The water head is high, the bottom width is small, and the anti-scouring capacity is large, but the cost of concrete cofferdams is relatively high; therefore, a composite cofferdam of concrete cofferdams combined with earth-rock cofferdams has emerged. The concrete cofferdams in this composite cofferdam As longitudinal cofferdam, earth-rock cofferdam as transverse cofferdam

[0003] The existing combined cofferdam of concrete cofferdam combined with earth-rock cofferdam has no corresponding improvement in the ability of the upstream surface of the earth-rock cofferdam to resist the impact of water flow, and the earth and rock are easily washed away under the action of water flow. It will pollute the water quality of downstream rivers and reduce the blocking effect of the cofferdam itself on water flow

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