Control method of side wall concrete crack of urban rail transit underground station body structure

A technology for urban rail transit and underground stations, applied in the field of concrete crack control of the main structure of the main structure of urban rail transit underground stations, can solve problems such as shrinkage cracking, achieve small temperature shrinkage and autogenous shrinkage, avoid leakage, and promote full hydration Effect

Active Publication Date: 2017-11-03
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides an effective crack control method for the problem that the side wall concrete with a thickness of ≥0.7m in the main structure of the urban rail transit underground station is very easy to shrink and crack during the construction period

Method used

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  • Control method of side wall concrete crack of urban rail transit underground station body structure
  • Control method of side wall concrete crack of urban rail transit underground station body structure
  • Control method of side wall concrete crack of urban rail transit underground station body structure

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Embodiment 1

[0056] Such as Figure 4 As shown, the crack control method of the present invention is applied to the main structure of a certain underground station in a northern urban rail transit project with four distinct seasons under a certain general environment. 210m, the design strength grade of concrete is C35P8, and the thickness of the side wall is 0.7m. The waterproof design level of the main structure is first-class, and the requirements for crack resistance and seepage prevention are very high.

[0057] According to the urban rail transit engineering underground station main body structure side wall concrete crack control method provided by the present invention, and in conjunction with the construction unit schedule, the sectioned pouring length and pouring time of the side wall concrete of the whole station are divided as shown in Table 1. The pouring length of the section ranges from 16.3m to 24.5m, and the pouring time is from October 16, 2016 to December 25, 2016, spanni...

Embodiment 2

[0067] Such as Figure 4 As shown, the crack control method provided by the present invention is applied to the main structure of an underground station in a certain urban rail transit project in southern Jiangsu with four distinct seasons. The main structure is a 12m island platform standard station with 2 floors underground, and the total length of the station is about 170m. The design strength grade of concrete is C35P8, and the thickness of the side wall is 0.8m. It is constructed by open cut and straight method, and the construction time is summer, autumn and winter. The waterproof design level of the main structure is first-class, and the requirements for crack resistance and seepage prevention are very high.

[0068] According to the urban rail transit engineering underground station main structure side wall concrete crack control method provided by the present invention, the sixteenth running water section of the underground station is selected as the test section for ...

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Abstract

The invention relates to a control method of a side wall concrete crack of an urban rail transit underground station body structure with the thickness larger than or equal to 0.7 m. The control method specifically includes the following measures that according to different construction seasons, the segmentation pouring length of concrete of the structure is determined; anti-cracking concrete raw materials are selected; the matching ratio of anti-cracking concrete is designed in an optimized manner; and a reasonable heat preservation and moisture preservation curing process is adopted, and the measures are sequentially carried out according to the construction steps. According to the control method, in the aspects of design of the segmentation pouring length of the structure, design of optimization and the matching ratio of the anti-cracking concrete raw materials and the heat preservation and moisture preservation curing process of the anti-cracking concrete, the complete technical scheme is formed, and generation of the shrinkage crack of the side wall concrete of the underground station body structure with the thickness larger than or equal to 0.7 m in the construction period can be effectively controlled.

Description

technical field [0001] The invention relates to a method for controlling concrete cracks in the side wall of the main structure of an underground station of urban rail transit. It forms a complete set of technology from the perspectives of structural section pouring length design, anti-crack concrete raw material optimization and mix ratio design, anti-crack concrete heat preservation, moisture retention and maintenance technology The scheme can effectively control the generation of shrinkage cracks during the construction period of the side wall concrete with a thickness of ≥0.7m in the main structure of the underground station. Background technique [0002] Urban rail transit projects have become the backbone of public passenger transport networks in large and medium-sized cities, and most of them are below the groundwater level. Although waterproof issues have been paid more and more attention, the analysis of publicly reported data shows that underground projects, especia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D29/16C04B28/04
CPCC04B28/04C04B2201/50E02D29/16C04B18/08C04B14/068C04B18/12C04B2103/302C04B22/143
Inventor 刘加平徐文田倩王育江姚婷李华
Owner JIANGSU SOBUTE NEW MATERIALS
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