Method for reducing longitudinal shrinkage joints of underground comprehensive pipe gallery

A technology for integrated pipe gallery and shrinkage joints, applied in underwater structures, water conservancy projects, artificial islands, etc., can solve problems such as collapse, cracks, structural safety hazards, etc., and achieve the effect of reducing the occurrence of cracks

Inactive Publication Date: 2016-10-26
江苏开来预应力工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The normal work of unbonded prestressed steel bars in the structure mainly depends on the anchorage at both ends. Once the anchorage fails for some reason,

Method used

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Embodiment Construction

[0014] The following examples can enable those skilled in the art to understand the present invention more comprehensively, but the present invention is not limited to the scope of the described examples.

[0015] In the present invention, take the underground comprehensive pipe gallery of Tiexi New Town in Shenyang, Liaoning as an example:

[0016] A method for reducing the longitudinal shrinkage joints of the underground comprehensive pipe gallery is shown, which controls the stress change of the section of the pipe gallery, specifically by controlling the stress of shrinkage, temperature and creep stress on the cracks in the underground comprehensive pipe gallery, thereby reducing and reducing the shrinkage joints. produce; when satisfying σ ck -σ pc ≤f tk , the longitudinal shrinkage joint can be reduced, σ ck is the normal stress of the crack-resistant edge concrete; σ pc Anti-cracking edge concrete precompression stress; specifically through the following steps to ac...

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Abstract

The invention relates to a method for reducing longitudinal shrinkage joints of an underground comprehensive pipe gallery. The method is characterized in that the stress change of the pipe gallery section is controlled, specifically, the stress making the underground comprehensive pipe gallery generate cracks is reduced through control over shrinkage stress, temperature stress and creep stress, and therefore, occurrence of the shrinkage joints is reduced; when sigma <ck>- sigma <pc> is smaller than or equal to f<tk>, the longitudinal shrinkage joints can be reduced, the sigma <ck> represents anti-crack edge concrete normal stress, and the sigma <pc> represents anti-crack edge concrete pre-pressure stress; through control over the shrinkage stress and the temperature stress in the construction stage, the purpose of reducing stress is achieved, and therefore, occurrence of the cracks is reduced; and through control over intelligent tensioning and by the adoption of cohesive pre-stressed concrete plates in the long-term maintenance stage, occurrence of the creep stress is reduced, and therefore, occurrence of the cracks is reduced.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a method for reducing longitudinal shrinkage joints of an underground comprehensive utility gallery. Background technique [0002] Concrete is a multi-phase composite material, which contains cement mortar as a parent material and coarse aggregate contained therein, and most aggregates themselves are also multi-phase composite materials, including various crystalline or non-crystalline components, and contain different degree of porosity. The hydration reaction of cement turns fresh plastic cement slurry into solidified cement slurry or cement stone, and at the same time converts fresh concrete into solidified concrete, which is a complex chemical and physical process. Creep is closely related to stress, and concrete will still shrink and produce cracks when there is no stress. Concrete shrinkage is a deformation that is related to time and not dependent on load. It is cause...

Claims

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Application Information

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IPC IPC(8): E02D29/045
CPCE02D29/045E02D29/10
Inventor 韩春斌
Owner 江苏开来预应力工程有限公司
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