A full-section quasi-three-grade long-age roller compacted concrete construction method

A technology of roller compacted concrete and construction methods, applied in filling, foundation structure engineering, construction, etc., can solve problems such as difficult to meet rapid construction of roller compacted concrete, difficult to guarantee concrete quality, unfavorable construction costs, etc., to achieve optimal construction methods , Reduce engineering investment and simple construction method

Active Publication Date: 2022-04-01
CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] At present, the existing RCC construction in China adopts partitioned, graded distribution and short-age RCC. In the process of building a dam with RCC, there are as many as several types of concrete in the same warehouse, which is difficult to meet Requirements for Rapid Construction of Roller Compacted Concrete
[0014] Secondly, due to the large number of concrete types and gradations in the same warehouse number, it is easy to appear in the wrong area during the concrete pouring process, which makes it difficult to guarantee the quality of the concrete
[0015] Again, because the maximum particle size of domestic RCC aggregates is 75mm, the domestic RCC textbooks are used in a large amount, which is not conducive to saving construction costs

Method used

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  • A full-section quasi-three-grade long-age roller compacted concrete construction method
  • A full-section quasi-three-grade long-age roller compacted concrete construction method
  • A full-section quasi-three-grade long-age roller compacted concrete construction method

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Experimental program
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Effect test

Embodiment 1

[0057] The present invention will be further described below in conjunction with the accompanying drawings and the specific implementation of concrete construction in the test section.

[0058] Roller compacted concrete dam building technology has the characteristics of fast and economical. Since the 1980s until now, the roller compacted concrete dam building technology has been perfected day by day, but some construction techniques still need to be continuously improved to meet the requirements of the RCC dam building technology. Requirements for rapid construction and quality compliance.

[0059] During the construction of roller compacted concrete dams at home and abroad, there are many types of concrete in the dam body, especially the secondary anti-seepage concrete at the upstream and downstream formwork positions, the surrounding corridors of the dam body, the left and right banks, the bank slopes on both sides, and the reserved holes. Metamorphic concrete needs to be co...

Embodiment 2

[0121] Embodiment 2: Construction method of full-section quasi-three-graded RCC. The method includes the following steps:

[0122] a. Base surface treatment, flushing and cleaning the completed base surface.

[0123]The foundation surface that has been poured (including normal concrete and roller compacted concrete) is subjected to roughening treatment. The roughening machine of Gezhouba Group is used for roughening. The roughening pressure is adjusted to the range of 25MPa-35MPa. , the pressure of the flushing machine can be adjusted to 45MPa. When flushing, it is required to form a certain angle between the flushing gun and the concrete surface, and determine the effect of flushing, and then determine the pressure and angle of the flushing gun. The cement slurry and milk skin are all cleaned up, and the stones on the concrete surface are just exposed.

[0124] According to the comparison of the data in the test section, it can be seen that the flushing can be carried out 6...

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Abstract

The invention belongs to the technical field of roller compacted concrete construction, and in particular relates to a full-section quasi-three-grade long-age roller compacted concrete construction method, in which appropriate aggregates are selected and the dosage of various materials is determined through a mix ratio test; The mix ratio is verified, and the verification can be completed by the method of passing the roller compacted concrete test section; after the construction of the full-section quasi-three-grade roller-compacted concrete test section is completed, the relevant parameters of the roller-compacted concrete are determined through various experiments; The construction of graded roller compacted concrete; according to the actual situation on site, the present invention combines the roller compacted concrete gravity dams under construction and completed at home and abroad to ensure that the anti-seepage requirements of the dam body are met according to the design of the dam body The optimization and adjustment of the conventional roller compacted concrete construction method can realize the rapid paving of roller compacted concrete under the premise of ensuring the anti-seepage quality of the dam body, which is beneficial to save the construction period and reduce the engineering investment.

Description

technical field [0001] The invention belongs to the technical field of roller compacted concrete construction, and in particular relates to a construction method of full-section quasi-three-grade long-age roller compacted concrete. Background technique [0002] Roller-compacted concrete: Roller-compacted concrete is a dry, hard, cement-poor concrete made of Portland cement, pozzolanic admixtures, water, admixtures, sand, and grading-controlled coarse aggregates to form a slump-free For dry hard concrete, use the same transportation and pouring equipment as for earth-rock dam construction, use unloading equipment for paving, and use vibrating rollers for layered compaction. Roller compacted concrete dams not only have the characteristics of small concrete volume, high strength, good anti-seepage performance, and the overflow of the dam body, but also have the advantages of simple, fast, economical construction procedures for earth-rock dams, and the use of large general-purpo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D15/02E02D17/18
CPCE02D15/02E02D17/18E02D2250/0023
Inventor 周庆国刘元广马萌濛石岩高元博
Owner CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD
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