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Method for producing prestressed concrete structures by means of profiles made of shape memory alloys and structures built according to this method

A technology of concrete structure and memory alloy, applied in the direction of structural elements, buildings, building components, etc., can solve the problem that anti-corrosion is no longer guaranteed.

Active Publication Date: 2017-11-10
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Problems solved by technology

If internal reinforcements are located in such carbonated areas, the corrosion protection of conventional steel is no longer guaranteed

Method used

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  • Method for producing prestressed concrete structures by means of profiles made of shape memory alloys and structures built according to this method
  • Method for producing prestressed concrete structures by means of profiles made of shape memory alloys and structures built according to this method
  • Method for producing prestressed concrete structures by means of profiles made of shape memory alloys and structures built according to this method

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Embodiment Construction

[0021] First, we must understand the properties of shape memory alloys. Some alloys show specific structures that depend on changes in heat but return to their original state after the heat is released. Just like other metals or alloys, these shape memory alloys (SMA) contain more than one crystal structure. They are polymorphic and therefore polycrystalline metals. The main crystal structure of shape memory alloy (SMA) depends on its temperature on the one hand, and on the other hand external stress, that is, tension or compression. When the temperature is higher, the alloy is called austenite, when the temperature is lower, the alloy is called martensite. The special feature of these shape memory alloys (SMA) is that even when they have previously been deformed in the low temperature stage, they can assume their original structure and shape after the temperature is raised in the high temperature stage. This effect can be used to apply prestress to the building structure.

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Abstract

The invention relates to a method involving placing a profile comprising a shape memory alloy in concrete, or roughening the outside of reinforced concrete, and then fixing the profile (2) comprising a shape memory alloy to the structure ( 6) and apply the cementitious matrix to the rough outer side (9) to cover the profile (2). After the cement matrix has been placed, the profile ( 2 ) develops contraction forces and thus tension due to the heat input. Due to the interlocking of the mortar cover (16) with the rough outer side (9) of the structure (6), the mortar cover (16) acts as a reinforcing layer. The profile (2) extends in the outer mortar as reinforcement layer (16) on the outside of the structure along the outer side of the structure inside the mortar or reinforcement layer (16). The structure can also be prepared for prestressing in the equipped mortar or reinforcement by heat input, since the cable (3) is routed from its end area to the outside of the mortar or reinforcement (16) or the end of the cable (3) The area is accessible by removing the insert (5).

Description

Technical field [0001] The present invention relates to a method for manufacturing prestressed concrete structural elements with a new structure (cast in situ at a construction site) or new prefabrication and a method for subsequent reinforcement of existing structures by cement and mortar. Among them, in cement-bonded mortar, the contour is made of shape memory alloy. Experts usually call this contour a shape memory alloy contour, or abbreviated as SMA contour. The shape memory alloy is placed for prestress. The prestressing system also connects subsequent additions to the existing structure under prestress. In addition, the present invention also relates to a concrete structure that is built or subsequently strengthened by using the method, and wherein additions are parked separately to the concrete structure according to the method. According to this, a special feature is that the steel-based shape memory alloy is used in the form of a profile to generate prestress. Backgr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00E04C5/01E04G21/12
CPCE04G21/12E04C5/01C22C38/00E04G23/0218C22C38/02C22C38/04C22C38/105C22C38/14C22C38/40E04C5/08E04B1/16E04C5/07
Inventor 克里斯蒂安·莱嫩巴赫马苏德·莫塔韦利贝内迪克特·韦伯沃克吉恩·莱罗尔夫·布龙尼曼克里斯托夫·恰德斯基
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