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High flexibility pre-pressing method pre-stress steel bar and implementation method thereof

A technology of prestressed steel bars and realization methods, applied in the processing of building materials, structural elements, building components, etc., can solve problems such as loss of balance and stability

Inactive Publication Date: 2009-12-30
SHANGHAI MUNICIPAL TRANSPORTATION DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the critical force is reached, the balance under the straight axis shape of the compression bar loses stability

Method used

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  • High flexibility pre-pressing method pre-stress steel bar and implementation method thereof
  • High flexibility pre-pressing method pre-stress steel bar and implementation method thereof
  • High flexibility pre-pressing method pre-stress steel bar and implementation method thereof

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Effect test

Embodiment

[0092] Such as image 3 As shown, the alloy structural pipe 5 is a steel pipe used for pre-stressed steel bars, and its function is to form a pre-pressed pre-stressed steel bar with more than one quantity, and its center penetrates a steel strand 6 (that is, a tensioned steel bar) with a jack Tension anchoring, put into the structure compression area and connect as a whole, exit the steel strand to apply pre-tension to the structure.

[0093] The clip 1 and the anchor ring 2 form a single-hole anchor (that is, the anchorage). When the jack tensions the steel strand 6 and relaxes, the clip 1 retracts along with the steel strand 6 to wedge the tapered hole of the anchor ring, and the steel strand 6 is clamped in the anchor ring 2, and the pressure exerted by the steel strand 6 is also transmitted to the precompressed stress reinforcement by the anchorage.

[0094]The anchor plate 3 is combined with the alloy structural tube 5 and the anchor rib 4 . The anchor plate 3 transmits...

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Abstract

A high flexibility pre-pressing method pre-stress steel bar and an implementation method thereof are disclosed in the invention. The penetrated steel bar is stretched, the balance of the straight line with a pressed center is replaced by the slight bend shape of slight eccentric accumbent stretched steel bar under the action of an axial pressure exceeding critical force, so that the pressure of the high flexibility pressure lever is larger than the critical force without occurring obvious bending and being the problem of combined deformation. The deformation form of the member is a combination of axial compression (or stretching) and pure bending, the stretching phase of the member is in a phase of slight deformation elasticity, and the installation phase is in an elasticity phase. At the same time, a twisted curve and a stress equation of the combined deformation of the member is established, and other conditions can be solved from the known conditions, thus section design and bearing capacity check can be carried out on the member. The invention needs no additional restriction, therefore the construction needs no special measures, and stretching, anchoring and installing adopt common methods. The invention has no instability restriction, large length, small section, free transverse press bending and slight deformation during pre-pressing and can be connected section by section for prolonging.

Description

technical field [0001] The invention relates to a compression-first prestressed steel bar, in particular to a compression-first prestressed steel bar whose pressure exceeds the critical force of a large-flexibility compression bar. Background technique [0002] The prestressed steel bar by the first compression method is a hollow compression bar that is prestressed through tension and anchorage to penetrate the steel bar before it is installed in the structure. Pour the stressed hollow compression rod into the structural concrete. After the concrete reaches the specified strength, it will penetrate the steel bar and unload it. The released force will reversely act on the entire load-bearing structure. [0003] In 1950, the British K. Billig proposed to form a preloading element with several sections of steel pipes that are tightly pressed against each other, and penetrate steel cables into the steel pipes, and perform preloading with the help of anchor plates fixed at both e...

Claims

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Application Information

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IPC IPC(8): E04C5/08E04G21/12
Inventor 邬妙年
Owner SHANGHAI MUNICIPAL TRANSPORTATION DESIGN INST
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