Externally prestressed FRP rebar tensioning anchorage device

An external prestressing and anchoring device technology, applied in the direction of bridge reinforcement, erection/assembly of bridges, buildings, etc., can solve the problems of shear damage, small operating space, large operating space, etc., to eliminate tangential force and prevent shearing. The effect of cutting damage and high safety

Pending Publication Date: 2019-07-19
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The external prestressed FRP tendon tensioning is close to the beam body, and its operating space is small, while the existing jack tensioning technology requires a large operating space, so the construction is more difficult
Secondly, the transverse strength of FRP tendons is low, and the asymmetric anchorage caused by construction errors will cause the FRP tendons to be tensioned and sheared (that is, subjected to tangential forces), resulting in shear failure when the tensile strength is not reached.
In addition, the previous anchoring methods are all one-time anchoring, which cannot be stretched again after the prestress is relaxed.

Method used

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  • Externally prestressed FRP rebar tensioning anchorage device

Examples

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Effect test

Embodiment 1

[0019] refer to Figure 1 ~ Figure 3 , the present invention discloses an external prestressed FRP tendon tensioning and anchoring device, including an anchor pad 100, an anchoring device and a tensioning device, the anchoring device is used to clamp the FRP tendon 400, and the tensioning device is installed on the anchor pad The plate 100 is connected with the anchoring device by transmission, and is used to pull the anchoring device to move in the tensioning direction of the FRP tendon 400, so as to realize the prestress tension of the FRP tendon 400.

[0020] In order to realize the adjustment of the anchoring device, the tensioning device is provided with a slider 500, the slider 500 can move along the tensioning direction of the FRP tendon 400 and is fixedly installed on the anchor backing plate 100, the anchoring device is installed on slider 500.

[0021] Specifically, the anchor pad 100 is provided with a channel 101 extending along the tensioning direction of the FRP...

Embodiment 2

[0052] This embodiment takes Embodiment 1 as the main body. The difference is that the anchoring device in this embodiment cancels the setting of the ball screw 501, and the sleeve 503 is directly installed on the slider 500, so as to meet the requirements of quick disassembly and simplification of the structure. requirements.

Embodiment 3

[0054] This embodiment takes Embodiment 1 as the main body, and the difference is that there is no meshing relationship between the ball screw 501 and the slider 500 in this embodiment, and the ball screw 501 is driven to the left by turning the second hex head 502 move.

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PUM

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Abstract

The invention discloses an externally prestressed FRP rebar tensioning anchorage device. The externally prestressed FRP rebar tensioning anchorage device integrates externally prestressed FRP rebar tensioning, anchorage and prestress adjusting and is most suitable for external FRP rebar tensioning reinforcing of a bridge or a building structure. The externally prestressed FRP rebar tensioning anchorage device comprises an anchor backing plate, an anchorage device and a tensioning device, the anchorage device is used for clamping FRP rebars, the tensioning device is mounted on the anchor backing plate, is in transmission connection with the anchorage device and is used for pulling the anchorage device to move in the tensioning direction of the FRP rebars, and thus prestressed tensioning ofthe FRP rebars is achieved. The FRP rebars are fixed through the anchorage device, then prestressed tensioning is conducted through the tensioning device without the need of adopting a jack, operationis easy and convenient, the required space is small, and safety is high; meanwhile, tangential acting force borne by the FRP rebars can be eliminated through a ball hinge device, and the FRP rebars are prevented from shear failure; and the externally prestressed FRP rebar tensioning anchorage device can be demounted to be reused, thus the economic and environment-friendly effects are achieved, tensioning anchorage can be conducted again after prestress relaxation of the FRP rebars occurs, and practicability is high.

Description

technical field [0001] The invention belongs to the technical field of construction equipment, and in particular relates to a tension anchoring device used for reinforcing external prestressed FRP tendons of bridges or building structures. Background technique [0002] Concrete structures are prone to problems such as mid-span deflection and cracking under the influence of unfavorable environments, which lead to a decrease in their bearing capacity. The external prestressing reinforcement technology can effectively improve the mechanical performance of this type of structure and prolong its service life. Among them, prestressed fiber reinforced composite (FRP) reinforcement is one of the commonly used reinforcement technologies due to its advantages of light weight, high strength, and corrosion resistance. Tension anchoring of prestressed FRP tendons is the key to ensure the use of this reinforcement technology. [0003] Because the external prestressed FRP tendons are str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D22/00E04G23/02E04G21/12
CPCE01D22/00E04G21/12E04G23/0218
Inventor 王磊易善昌蒋田勇张建仁戴理朝袁平
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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