Concrete construction control method for preventing harmful cracks of wallboard

A control method and concrete technology, which is applied in artificial islands, water conservancy projects, infrastructure projects, etc., can solve problems such as leakage, prevent temperature difference cracks, and save construction time

Active Publication Date: 2014-01-01
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

If it continues to develop, there may be leakage

Method used

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  • Concrete construction control method for preventing harmful cracks of wallboard

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] In this embodiment, the concrete pouring in the basement of the 220kV and 110kV power distribution equipment building is taken as an example, such as figure 1 Shown, a kind of concrete construction control method that prevents the harmful crack of wallboard, it is characterized in that, comprises the following steps:

[0019] (1) Determine the concrete initial setting time t;

[0020] (2) According to the required initial setting time t, select suitable cement types, construction conditions and admixtures to prepare suitable construction concrete;

[0021] (3) Concrete pouring from the plane direction, first pass through the construction joint position Line No. divides the whole construction area into 3 zones, among which, No. ①~⑧ is Zone 1, No. 8~⑨ is Zone 2, and No. It is zone 3, and follow the order of foundation floor in zone ...

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Abstract

The invention relates to a concrete construction control method for preventing harmful cracks of a wallboard. The method includes: (1), determining initial setting time t of concrete; (2), selecting a suitable cement type, construction condition and construction concrete with appropriately dispensed additive agent according to the required initial setting time t; (3), concrete pouring from a plane direction, dividing a whole construction area into three subareas according to construction joint position, and performing construction sequentially; and (4), concrete pouring from a vertical direction, dividing the whole construction section into two subsections according to an elevation from minus 4.04m (metre) to 0.84m, and performing construction from a first subsection to a second subsection. Compared with the prior art, the method can shorten construction period, outside templates of the wallboard can not necessarily be removed in advance in order to meet the deadline of construction, and therefore, wallboard concrete can complete contraction distortion slowly under a humid environment, temperature difference cracks caused by temperature difference inside and outside the concrete resulting from removing the templates in advance are effectively prevented.

Description

technical field [0001] The invention relates to a concrete construction method, in particular to a concrete construction control method for preventing harmful cracks in basement wall boards. Background technique [0002] During the construction of substation basement foundation and wall slab concrete, concrete pouring is carried out step by step. After the first poured concrete solidifies, new concrete pouring is carried out. In this way, gaps are formed between successively poured concrete interfaces, which is called construction. seam. The existence of construction joints set below the perennial groundwater table provides a channel for water infiltration. There is also a sudden change in the section, such as the variable section position of the foundation beam and the wall panel, etc., where the sudden change in the cross-sectional size is the place where cracks are prone to occur. [0003] Most of the cracks are caused by insufficient concrete tensile strength and tensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D29/16
Inventor 周岳林方振雄仇志斌茹湧春王宜民王晓锋
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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