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Built-in anchorage type prestress FRP rib tensioning and anchoring device

An anchoring device and prestressing technology, applied in structural elements, building components, building reinforcements, etc., can solve problems such as difficulty in use, fracture of FRP bars, low transverse shear strength and low longitudinal tensile strength, etc. Simple operation and convenient construction

Inactive Publication Date: 2015-12-23
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when applying prestress to FRP bars by using similar traditional clamping steel bar tension anchorage devices, because FRP bars are an anisotropic material, their transverse shear strength is far lower than the longitudinal tensile strength, so in Stress concentration sites such as tensioning ends or anchoring ends are prone to the phenomenon of overall fracture of FRP tendons caused by shearing of some FRP fibers, so that effective prestress cannot be applied to FRP tendons
On the other hand, most of the existing FRP tendon tensioning and anchoring devices are complex in structure and need to be placed at the end of the component, so it is difficult to use them in the negative moment area of ​​reinforced concrete continuous beams, slabs and other components.
In addition, it is generally necessary to use large-scale hydraulic equipment when applying prestress to FRP tendons, and the construction process is complicated and expensive.
The existence of these problems restricts the development and application of prestressed FRP tendon technology

Method used

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  • Built-in anchorage type prestress FRP rib tensioning and anchoring device
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  • Built-in anchorage type prestress FRP rib tensioning and anchoring device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 , figure 2 , Figure 4 , Figure 6 As shown, a built-in anchor type prestressed FRP tendon tension anchoring device, including prestressed FRP tendon 1, bonding material 2, steel sleeve 3, screw rod 4, nut 5, annular steel washer 6 and circular anchor Ring 7, the two ends of the prestressed FRP bars 1 are respectively inserted into the open ends of the steel sleeve 3 at the tension end and the anchor end, and fixed with bonding material 2, the steel sleeve 3 at the tension end A section of screw rod 4 is welded to the closed end of the screw rod 4, so that the screw rod 4 passes through the ring wall of the circular anchor ring 7 at the tension end, and an annular steel gasket 6 and a nut 5 matching the screw rod 4 are installed in the circular anchor ring 7; The closed end of the steel sleeve 3 at the end passes through the ring wall of the circular anchor ring 7 at the anchor end, and is welded together with the circular anchor ring 7.

[0027] S...

Embodiment 2

[0039]This embodiment is basically the same as the above-mentioned embodiment 1, the difference is that there are two prestressed FRP tendons 1 and they are relatively close to each other. At this time, the anchor rings at the tensioning end and the anchoring end can be improved, and the concrete member The hole slots on the surface are also adjusted accordingly, such as Figure 7 As shown, other specific implementation steps are the same as those in Embodiment 1, and the prestressing force can be applied to the component with two prestressing FRP tendons at the same time.

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Abstract

The invention relates to a built-in anchorage type prestress FRP rib tensioning and anchoring device. The device comprises prestress FRP ribs, binding materials, steel sleeves, a screw rod, a nut, an annular steel washer and a circular anchor ring, wherein the two ends of the prestress FRP ribs are respectively inserted in opening ends of the steel sleeves at a tensioning end and an anchoring end, and are fixed by the binding materials; a closing end of the steel sleeve at the tensioning end is welded with a section of screw rod; the screw rod penetrates through the ring wall of the circular anchor ring at the tensioning end; the annular steel washer and the nut matched with the screw rod are mounted in the circular anchor ring; and a closing end of the steel sleeve at the anchor end penetrates through the ring wall of the circular anchor ring at the anchoring end, and is welded with the circular anchor ring. The device is suitable for FRP rib materials with various materials and various section forms, is simple in structure, low in cost and convenient for construction, and can be applied to concrete structural components built and reinforced by a prestress FRP rib technology.

Description

technical field [0001] The invention relates to a built-in anchor type prestressed FRP tendon tension anchoring device. Background technique [0002] In recent years, FRP bars have been more and more widely used in practical engineering due to their outstanding advantages such as light weight, high strength, corrosion resistance and fatigue resistance. Compared with non-prestressed FRP bars, when using prestressed FRP bars to build or strengthen concrete structural members, it can not only overcome the shortcomings of the former FRP material's low utilization rate of high-strength properties, but also prevent the occurrence of FRP peeling damage, improve the stiffness and The cracking load and other aspects have a very positive effect, so the prestressed FRP tendon technology has a broader application prospect. [0003] However, when applying prestress to FRP bars by using similar traditional clamping steel bar tension anchorage devices, because FRP bars are an anisotropic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C5/12
Inventor 张智梅熊浩张振凯
Owner SHANGHAI UNIV
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