Railway tunnel lining construction method based on medium and high fluidity concrete

A technology with high fluidity and construction method, which is applied in the direction of tunnel lining, tunnel, shaft lining, etc., can solve the problems of poor pumpability of pumped concrete, inability to meet on-site construction, poor concrete discreteness, etc. Workability and suitability, effect of improving compactness and strength

Active Publication Date: 2020-04-07
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: poor pumpability of the pumped concrete in the existing tunnel lining construction technology, lack of compactness by vibration, poor dispersion of concrete, large fluctuation of strength, density of internal reinforcement, and restrictions on the working window of the formwork. Unable to meet the requirements of on-site construction

Method used

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  • Railway tunnel lining construction method based on medium and high fluidity concrete
  • Railway tunnel lining construction method based on medium and high fluidity concrete
  • Railway tunnel lining construction method based on medium and high fluidity concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Concrete mixing

[0044] 1) The mixing capacity of the mixing station on the construction site should meet the requirements of continuous pouring on site, and at least two sets of mixing equipment with a rated production capacity of not less than 90m3 / h should be equipped; to use.

[0045] 2) The moisture content of coarse and fine aggregates should be measured before concrete mixing, and the construction mix ratio should be adjusted in time. At least one test per shift, and the number of tests should be increased when the moisture content changes significantly.

[0046] 3) Concrete mixing time should be determined through experiments according to the mix ratio and mixing equipment, but the shortest time should not be less than 2 minutes, and should not be less than 90s, and fiber concrete and winter concrete should be extended by 30s.

[0047] 4) The production information of the mixing station has the functions of automatic recording, uploading and storage.

[0...

example 2

[0088] In order to verify the use effect of medium and high fluidity concrete, 27 sets of lining verification tests were performed on the lining C35 concrete of a railway tunnel project, and the statistics were counted according to the length of each set of 12m. The strength of concrete is compared with ordinary concrete, and the strength of lining is shown in Table 2.

[0089] Table 2 Comparison table of tunnel lining strength

[0090]

[0091]

[0092] Note: Three core samples are drilled for each group of linings. According to the current specification, the lowest strength value is taken as the representative value of the lining strength of this group.

[0093] Table 3 Statistical table of intermediate results of non-destructive testing of tunnel lining quality in a railway project (construction method of railway tunnel lining with medium and high fluidity concrete)

[0094]

[0095] Table 4 Statistical table of intermediate results of non-destructive testing of tun...

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Abstract

The invention belongs to the technical field of railway tunnel lining construction, and discloses a railway tunnel lining construction method based on medium and high fluidity concrete. The railway tunnel lining construction method based on the medium and high fluidity concrete specifically comprises the steps of firstly clearly knowing working performance requirements of the medium and high fluidity concrete; then proposing performance requirements of raw materials; then proposing requirements of equipment and facilities of a mixing station; then proposing requirements for transportation of the concrete; and finally proposing requirements for pouring, vibration and maintenance of the concrete. The railway tunnel lining construction method based on the medium and high fluidity concrete caneffectively overcome the technical defect caused by the poor pumpability of pumped concrete, not tight compaction, poor dispersion of the concrete, the high strength fluctuation, low internal reinforcement density and restriction of a formwork working window in the prior art.

Description

technical field [0001] The invention belongs to the technical field of railway tunnel lining construction, and in particular relates to a railway tunnel lining construction method based on medium-high fluidity concrete. Background technique [0002] At present, the existing technology commonly used in the industry is as follows: tunnel lining engineering is often difficult to fully and effectively vibrate the concrete like pouring other components / parts during concrete construction due to the equipment of the lining trolley and the construction technology. Whether the formwork is completely filled or not depends mainly on the experience and judgment of the operator. Therefore, there are problems such as poor pumpability of pumped concrete, insufficient vibration, poor dispersion of concrete, large fluctuations in strength, density of internal reinforcement, restrictions on formwork windows, etc. Factors, it is difficult for concrete to achieve the required compactness. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10
CPCE21D11/10
Inventor 高存成李立功刘洛汉杨卓汪富军冯坤杨聚会张立勃王鹏飞杨红伟张立波唐威刘鑫
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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