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Prestressed real-time monitoring clip anchor and its anchoring method

A real-time monitoring and prestressing technology, which is applied to buildings, building structures, and processing of building materials. The effect of high anchor accuracy, convenient construction, and timely supplementation of the loss value of prestress

Active Publication Date: 2017-08-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem that existing anchors are difficult to monitor the loss of prestressed anchors in real time and cannot accurately ensure the tension control stress of prestressed tendons, and further provides a prestressed real-time monitoring clip anchor and its anchorage tensioning method

Method used

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  • Prestressed real-time monitoring clip anchor and its anchoring method
  • Prestressed real-time monitoring clip anchor and its anchoring method
  • Prestressed real-time monitoring clip anchor and its anchoring method

Examples

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specific Embodiment approach 1

[0017] Specific implementation mode one: as Figure 1~5 As shown, the prestressed real-time monitoring clip anchor of this embodiment includes an outer nut 1, an inner anchor ring 2, a monitor 7, a connector 6 and eight resistance strain gauges 5, and it is characterized in that: the clip anchor It also includes a wedge-shaped cone 3, the outer nut 1 is a regular octagonal nut, the outer nut 1 is processed with a wire channel 4, the outer surface of the inner anchor ring 2 is processed with an outer thread 2-1 along its length direction, and the inner anchor One end of the ring 2 is processed with a wedge-shaped hole 2-3, and the other end of the inner anchor ring 2 is processed with a center hole 2-4. The wedge-shaped hole 2-3 is coaxial and communicated with the center hole 2-4 of the inner anchor ring 2. The small end of the hole 2-3 is connected with the central hole 2-4 of the inner anchor ring 2, and the outer surface of the inner anchor ring 2 is processed with a regula...

specific Embodiment approach 2

[0018] Specific implementation mode two: as figure 2 As shown, in this embodiment, the two strain gauges 5 provided on each side of the strain gauge 5 are arranged perpendicular to each other, adopt temperature self-compensation, and connect to form a Wheatstone full bridge. Such a design can increase the sensitivity of the bridge to 2(1+μ) times, where μ is the Poisson’s ratio of the inner nut 2 of the anchorage. Adds a bend effect. Other components and connections are the same as those in the first embodiment.

[0019] Poisson's ratio: The absolute value of the ratio of the transverse strain caused by a uniformly distributed longitudinal stress to the corresponding longitudinal strain within the proportional limit of the material.

specific Embodiment approach 3

[0020] Specific implementation mode three: as figure 2 As shown, the axial position of the regular octagonal groove 2-2 in this embodiment corresponds to the axial position of the small end of the wedge-shaped hole 2-3. Such a design can avoid too much weakening of the inner nut 2 in the circumferential direction, and can also prevent the inner nut 2 from being too close to the bottom, which will affect the overall mechanical performance of the anchorage. Other compositions and connections are the same as those in Embodiment 1 or 2.

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Abstract

A prestressed real-time monitoring clip anchor and an anchor tensioning method thereof relate to a clip anchor and an anchor tension method. The invention solves the problem that the existing anchorage is difficult to monitor the loss of the prestressed anchorage in real time, and the tension control stress of the prestressed tendon cannot be accurately guaranteed. Device: The outer surface of the inner anchor ring is machined with regular octagonal grooves in the radial direction. The wire channel corresponds to the axial position of the regular octagonal grooves. The monitor is connected to eight resistance strain gauges through connectors. Eight resistance strain gauges are arranged on the four sides alternately in the groove, and two resistance strain gauges are arranged on each side of the resistance strain gauge; method: step 1, anchorage installation; step 2, tensioning Jack; step 3, repeat step 2 through the display value of the stress real-time monitor until it reaches σcon; step 4, connect the stress real-time monitor during the use of the structure, and operate according to step 3. The invention is used for monitoring and stretching the prestress of prestress tendons.

Description

technical field [0001] The invention relates to a prestressed real-time monitoring clip anchor and an anchor tensioning method thereof, belonging to the technical field of civil engineering. Background technique [0002] In order to make the prestressed concrete structure achieve the predetermined performance during the construction of the prestressed tendons and the service of the structure, and ensure the safety and applicability of the prestressed concrete structure, the effective prestress of the prestressed tendons arranged in the structure should be controlled. Make it consistent with the design calculation results. Because the prestressed concrete structure will produce anchorage and prestressed tendons retraction during the tensioning process of prestressed tendons, the anchoring process of prestressed tendons at the tension end is also the process of prestressed anchorage losses caused by prestressed tendons shrinkage; The creep and shrinkage of concrete in the lon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G21/12
Inventor 周威胡亚辉郑文忠王钧孙飞虎耿相日徐志鹏
Owner HARBIN INST OF TECH
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