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Device and method for monitoring stress transfer length of pre-tensioned prestressing rib based on optical fiber sensing

A technology of prestressed tendons and monitoring devices, applied in the direction of measuring devices, optical devices, instruments, etc.

Active Publication Date: 2017-12-22
南京鋆扬信息科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still a lack of high-precision long-term monitoring equipment for the stress transfer length of prestressed tendons

Method used

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  • Device and method for monitoring stress transfer length of pre-tensioned prestressing rib based on optical fiber sensing
  • Device and method for monitoring stress transfer length of pre-tensioned prestressing rib based on optical fiber sensing
  • Device and method for monitoring stress transfer length of pre-tensioned prestressing rib based on optical fiber sensing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0089] According to the second embodiment provided by the present invention, a method for monitoring the stress transfer length of pretensioned prestressed tendons based on optical fiber sensing is provided.

[0090] A method for monitoring the stress transfer length of pretensioned prestressed tendons based on optical fiber sensing, the method comprising the following steps:

[0091] 1) According to the size of the concrete 6 to be poured and the expected prestressed size of the prestressed tendons 1, determine the number of metal rings 3, the gap between the metal rings 3 and the prestressed tendons 1, and determine the length of the fixed support 2;

[0092] 2) Fix the metal ring piece 3 on the fixed bracket 2, set the detection grating 4 and the temperature compensation grating 7 on the metal ring piece 3, use the transmission fiber 5 to connect the detection grating 4 and the temperature compensation grating 7 in series, and the transmission fiber 5 The other end is conne...

Embodiment 1

[0106] Such as Figure 1-4 As shown, a pre-tensioned prestressed tendon stress transmission length monitoring device based on optical fiber sensing, the monitoring device includes 2 fixed brackets 2, 5 metal rings 3, detection grating 4, transmission optical fiber 5. The prestressed tendon 1, the fixing bracket 2, the metal ring piece 3 and the detection grating 4 are all arranged in the concrete 6. A fixed bracket 2 is provided on one side or around the prestressed tendon 1 . The metal ring piece 3 is arranged on the fixing bracket 2 . The prestressed tendon 1 passes through the middle of the metal ring sheet 3, and there is a gap between the metal ring sheet 3 and the prestressed tendon 1. Each metal ring piece 3 is provided with a detection grating 4 . One end of the transmission fiber 5 is connected to the detection grating 4 , and the other end of the transmission fiber 5 extends out of the concrete 6 . The monitoring device also includes a temperature compensation gr...

Embodiment 2

[0110] Repeat Example 1, except that the monitoring device also includes a monitoring control analysis system 8 . One end of the transmission optical fiber 5 protruding from the concrete 6 is connected to a monitoring control analysis system 8 .

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Abstract

The invention relates to a device for monitoring the stress transfer length of a pre-tensioned prestressing rib based on optical fiber sensing. The monitoring device comprises a fixing bracket, metal ring pieces, detection gratings and a transmission optical fiber, wherein the prestressing rib, the fixing bracket, the metal ring pieces and the detection gratings are all arranged in the concrete; the fixing bracket is arranged at one side or around the prestressing rib; the metal ring pieces are arranged on the fixing bracket; the prestressing rib runs through the middle of the metal ring pieces, and a clearance is reserved between each metal ring piece and the prestressing rib; and the detection gratings are arranged on the metal ring pieces and connected through the transmission optical fiber. The monitoring device provided by the invention is arranged in the concrete and is not directly contacted with the prestressing rib, accurate and high-precision monitoring for the transfer length of the stress of the prestressing rib can be achieved, the error is small in utilization of the device, the precision is high, and the variation in transfer length of the stress of the prestressing rib can be monitored for a long term.

Description

technical field [0001] The invention relates to a monitoring device for the prestress transmission length of a prestressed concrete structure, specifically a pretensioned prestressed concrete structure prestress transmission length monitoring device and a monitoring method based on optical fiber sensing technology, which belongs to the health monitoring of civil engineering concrete structures field. Background technique [0002] Prestressed concrete structures have been used extensively around the world since World War II. Compared with traditional reinforced concrete structures, prestressed structures can effectively improve the crack resistance of concrete, increase structural rigidity and strength, thereby reducing component size, reducing self-weight, and increasing the use space of buildings. According to the different forms of stress anchorage, prestressed structures can be divided into two categories, pre-tensioned prestressed structures and post-tensioned prestress...

Claims

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Application Information

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IPC IPC(8): G01B11/02G01B11/16
CPCG01B11/02G01B11/165
Inventor 张旭辉刘博文杨才千王磊张建仁许福唐盛华
Owner 南京鋆扬信息科技有限公司
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