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Anchorage assembly

An anchor and wedge technology, applied in the field of anchors, can solve the problems of pulling inwards into the formed concrete body, concrete cracking, etc.

Inactive Publication Date: 2002-05-15
CCL STRESSING INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large pulling force acting on the anchor ring, it is still possible to pull the above-mentioned anchor ring inwards into the formed concrete body, and in addition, due to the tapered characteristics of the above-mentioned anchor ring, a so-called "Cracking force" which cracks the concrete around the anchor ring

Method used

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Examples

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Embodiment Construction

[0064] Description of preferred embodiments

[0065] Specific reference Figure 2A As shown, the figure shows a wedge 21 having an inner front non-contact portion 24 and an outer front non-contact portion 25 . It can be seen that under normal operating load conditions, the front end 26 in the wedge 21 is not supported because it is not in contact with the frusto-conical portion in the hole 22, or the rib 23. This avoids the pressing of the flattening teeth in the area of ​​the inner front non-contact portion 24 against the steel bar or strand and reduces the possibility of wear for improved fatigue life. In other words, the above-mentioned wedge 21 works the same as the short wedge without the inner front non-contact portion. The "effective length" of the aforementioned wedge is represented by "X3".

[0066] Refer below Figure 2B , the figure shows the wedge in an extreme load state, the inner front end non-contact portion 24 and the outer front end non-contact portion 25...

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Abstract

The invention relates to anchorage assemblies and in particular to anchorage assemblies having a novel wedge arrangement, wedges for use with anchorage assemblies and an anchorage member. In order to improve wedge performance in an anchorage assembly, a wedge is provided having both internally and externally relieved portions to give a nose area which is tapered to a greater extent than the rest of the wedge. Under normal load conditions, the wedge behaves like a short wedge having no nose relief and is highly efficient. However, under high load or load limit conditions, the nose portion of the wedge is arranged to deform plastically so that fretting of the stressing element gripped by the wedge does not occur. As well as the high performance wedge, an improved anchorage member for the anchorage assembly is provided, the anchorage member having a number of steps. The provision of steps in the anchorage member reduces the tendency for anchorage members to be drawn into prestressed concrete structures and reduces the bursting forces within such structures. The combination of an anchorage assembly having the improved wedge and improved anchorage member is a particularly effective and advantageous one.

Description

technical field [0001] The present invention relates to anchors, and more particularly to anchors having a novel wedge and an anchor ring for forming anchors for prestressed concrete structures. [0002] In particular, the invention relates in particular to so-called field anchorages suitable for tendons with multiple steel strands, comprising support plates or similar parts, which are pressed against the surface of a structure, but the invention is not limited to the above-mentioned Types of anchors. Background technique [0003] When constructing prestressed reinforced concrete structures, after pouring concrete, it is necessary to tension multiple steel bars. Generally speaking, the above-mentioned construction method includes the following steps: using a plurality of metal rods to form a formwork (finally the concrete will be poured into the formwork); fixing pairs of anchor rings on the formwork in a relative manner; The formed force tendons connect opposite pairs of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04C5/12
CPCE04C5/122
Inventor D·R·格林M·A·史密斯D·菲利浦斯
Owner CCL STRESSING INT