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Underground station strong constraint superposed wall lining cast-in-place concrete structure crack control method

A technology of concrete structure and lining concrete, which is used in underwater structures, infrastructure engineering, buildings, etc.

Active Publication Date: 2019-11-08
SHANGHAI URBAN CONSTR MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the inability of the prior art to effectively solve the problem of concrete cracks in the inner lining of strongly constrained laminated walls, the present invention provides a method for controlling cracks in the cast-in-situ concrete structure of the inner lining of strongly constrained laminated walls in underground stations, which can effectively reduce the risk of cracking of the inner lining concrete. Inhibit the occurrence and development of shrinkage cracks

Method used

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  • Underground station strong constraint superposed wall lining cast-in-place concrete structure crack control method
  • Underground station strong constraint superposed wall lining cast-in-place concrete structure crack control method
  • Underground station strong constraint superposed wall lining cast-in-place concrete structure crack control method

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Embodiment 1

[0114] Apply the crack control method of the cast-in-situ concrete structure of the strong constrained laminated wall lining of the present invention to the construction of the main structure of an underground station. The station is an island-type single-column double-span wiring station. 4. Four foundation pits in area 1-b are constructed. The total length of the station is 590.68m, and the width is 20.14m. The open-cut method is adopted for construction. The underground enclosure structure adopts an 800mm ground connection wall, and the thickness of the inner lining is 400mm. The concrete design number is C35P8. 56d electric flux ≤ 1700C, the formwork process adopts steel formwork, the waterproof level is the first level, and the requirements for crack resistance and seepage resistance are high. For its structure, see figure 2 .

[0115] Apply the crack control technology of the present invention to the construction of part of the inner lining of the superimposed wall of t...

Embodiment 2

[0124] Apply the crack control method of the cast-in-situ concrete structure of the strong constraint laminated wall lining of the present invention to the laminated wall lining structure of the main structure of an underground station of rail transit. About 3.0m, and the buried depth of the floor is about 18.1m. The structure of the station adopts a double-column and three-span cast-in-place reinforced concrete box structure system. The lining wall of the standard section is 400mm, and the end well is 600mm. C35P8, the waterproof grade is the first grade, and the requirements for anti-crack and anti-seepage are high, and the electric flux of 56d is ≤1700C. The crack control technology of the present invention was used for the construction of part of the superimposed wall linings of No. 1, 3, and 5 foundation pits of the station. The construction time was from June 2018 to September 2018, spanning the entire summer high temperature season.

[0125] According to the crack cont...

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Abstract

The invention relates to an underground station strong constraint superposed wall lining cast-in-place concrete structure crack control method. The underground station strong constraint superposed wall lining cast-in-place concrete structure crack control method comprises the following steps: performing cracking risk evaluation on the key influence factors of superposed wall lining concrete and calculating the quantitative influence on the cracking risk coefficient by different factors; optimally designing lining C35P8 concrete mixed proportion and burying temperature and deformation sensors in parts with high cracking risk; soaking jointing surface concrete with clean water before pouring, performing high-temperature construction, controlling the concrete casting temperature to be less than 26 DEG C, increasing the temperature of a core part to the highest peak value after concrete pouring is completed, dismantling a template after the temperature is obviously reduced, sticking the surface and the top at once after dismantling the template and covering with heat-insulating and moisturizing maintaining cloth; and after maintaining, observing and counting the surface crack condition. By the method provided by the invention, the cracking risk of the superposed wall lining is reduced, the technical problem that the superposed wall lining is liable to crack is effectively controlled and prevented and construction quality is guaranteed.

Description

technical field [0001] The invention relates to a method for controlling cracks in concrete structures, in particular to a method for controlling cracks in cast-in-situ concrete structures in inner linings of strongly constrained composite walls in underground stations. Background technique [0002] In recent years, with the acceleration of the construction of urban rail transit projects, water leakage caused by cracks in the main side walls of underground stations has attracted more and more attention. During the construction period and the service period, huge manpower and material resources are repeatedly invested in plugging and maintenance, which directly causes a great waste of economic and social resources. After the subway concrete cracks, the structural permeability is increased, and the chance of harmful medium erosion is increased. The long-term service of concrete Durability has a great impact, directly affecting the safety and life cycle of subway stations. [...

Claims

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Application Information

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IPC IPC(8): E02D29/045E02D29/16
CPCE02D29/04E02D29/16
Inventor 李欢欢徐文陶利董欢杨路徐亚玲徐海涛袁俊发施艇周时强张坚王育江姚婷郑诚黄超何拥军陈辉徐同磊朱伟峰余芪敏李华张士山谢彪陈冠良韦坤
Owner SHANGHAI URBAN CONSTR MATERIAL CO LTD
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