Backfilling process for large ultra-deep circulating water pipe

Abstract

The invention discloses a backfilling process for a large ultra-deep circulating water pipe, comprising the steps of: (1) constructing a sand bedding layer, wherein the sand bedding layer is 1000-1500 mm in thickness and is made of moderate-coarse sand and coarse sand; (2) covering the pipe by using concrete, wherein the concrete layer is 4000-5500 mm in thickness; and putting a circulating waterpipe on the sand bedding layer; (3) backfilling: paving a stone chip layer on the concrete layer, wherein each backfilling layer is less than or equal to 500 mm in thickness, the compactedness is more than 90%, and the total thickness of the stone chip layer is 3000-4500 mm; paving a macadam layer on the stone chip layer, wherein the maximum grain size of the macadam is not more than 100 mm, eachbackfilling layer is less than or equal to 500 mm in thickness, the compactedness is more than 85%, and the macadam layer is 4000-6000 mm in thickness. By use of the backfilling process, the anticorrosion performance of the large ultra-deep circulating water pipe can be improved so that the pipe can be effectively prevented from corrosion for the service life of 60 years.

Description

technical field [0001] The invention belongs to a circulating water pipeline backfilling process. Background technique [0002] The circulating water pipeline project is located in the field and is an open-air construction with a long construction period. It needs to experience extreme weather such as high temperature in summer, typhoon, and freezing cold in winter, which brings many difficulties to the backfilling of the pipeline; There are various forms of backfill layer, silt layer, bedrock layer, and pipeline foundation. [0003] For large-scale pipelines, especially circulating water pipelines in power plants, the usual backfilling process cannot meet the anti-corrosion life of at least 60 years. Contents of the invention [0004] In order to overcome the shortcomings of poor anti-corrosion performance and short service life of the existing circulating water pipeline backfilling process, the present invention provides a large-scale ultra-deep circulating water pipeli...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of poor anti-corrosion performance and short service life of the existing circulating water pipeline backfilling process, the present invention provides a large-scale ultra-deep circulating water pipeline backfilling process that improves the anti-corrosion performance and effectively guarantees that the pipeline anti-corrosion can reach 60 years of life

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