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Section bar pull out technology by freezing for destroying gripping power of section bar concrete composite member

A composite component, concrete technology, applied in the direction of infrastructure engineering, construction, sheet pile walls, etc., can solve problems such as unseen steel

Inactive Publication Date: 2010-02-24
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no section steel removal technology that meets this requirement

Method used

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  • Section bar pull out technology by freezing for destroying gripping power of section bar concrete composite member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1, when the component matrix material 3 is cement soil with low strength (compressive strength is 3MPa), the thickness of the medium layer 2 is 0mm, that is, there is no medium layer, and the shaped steel 1 is in direct contact with the cement soil. When the shaped steel is pulled out, liquid nitrogen is injected into the hollow interior of the shaped steel 1, so that the temperature difference between the shaped steel and the cement soil increases sharply by more than 10°C, and the shear force and The tensile force, as well as the freezing damage of the cement soil, destroys the binding force between the steel and the cement soil, and then the steel can be pulled out.

Embodiment 2

[0014] Embodiment two, when member matrix material 3 is the higher concrete of intensity (compressive strength is 20MPa), section steel is long 8m, and medium layer 2 is the tin layer of thickness 2mm, is to stick the tin plate with 2mm thickness with modified acrylate Formed on the outer wall of the section steel. When the section steel is pulled out, liquid nitrogen is injected into the hollow interior of the section steel 1 to reduce the temperature of the section steel to below minus 33°C, so as to destroy the binding force between the section steel and the concrete, and then the section steel can be pulled out.

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Abstract

A section steel concrete composite component bond force frozen destruction section steel plug out technology, the art method of the technology is: the outer surface of the tubular section steel is added with a media layer in the thickness of 0-X mm (X=0.5-2), the characteristic of the media layer can ensure the concurrent work capability of section steel concrete is not changed because of the existence of media layer when the section steel concrete bears loads, the media layer has enough strength, the binding power between concrete and media layer, between the media and section steel is not smaller than the bond force between the concrete and the section steel, the media materials can be tin and so on; it uses the materials nature differences of heat conductivity coefficient and thermal-expansion coefficient of steel products and cement or concrete, or it uses the abatement characteristic of media under the low temperature condition, and it cools the section steel swiftly through injecting cold source ( such as liquid nitrogen, dry ice, etc.) into interior of section steel, realizes the destruction of the bond force between the section steel and concrete, then the section steel islifted by ordinary machine, so the section steel is removed smoothly.

Description

(1) Technical field: [0001] The invention discloses a method for pulling out a section steel damaged by freezing force of a steel-concrete composite member, belonging to the technical field of civil engineering. (two) background technology: [0002] Some temporary structures composed of steel concrete (or steel cement soil) composite components have a short service time, such as steel concrete retaining walls, steel cement soil retaining walls, and soil layer anchors in deep foundation pit enclosures. Their The service period only takes a few months. After the service period, some must be removed due to environmental factors, such as steel cement-soil retaining walls built outside the building red line or soil anchors extending beyond the building red line, which must be pulled out after use; in addition, from cost saving and sustainable development Considering that the section steel in these temporary structures should also be recycled after use. [0003] When these compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D9/00E02D5/02
Inventor 范一锴黄新
Owner BEIHANG UNIV