High-strength bolt connecting gusset plate compression detection method

An ultrasonic echo, high-strength bolt technology, applied in the direction of measuring force, measuring device, force/torque/work measuring instrument, etc., can solve the problem of inaccurate state of gusset plate, and achieve satisfactory detection speed, high application value, and high accuracy. sexual effect

Active Publication Date: 2017-09-15
WUHAN UNIV OF TECH
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Problems solved by technology

[0003] The evaluation methods for the construction and operation quality of high-strength bolt gusset plates at home and abroad include torque wrench method, elongation value method and ultrasonic stress measurement method based on the principle of acoustic elasticity. The method indirectly infers the technical state of the gusset plate, but the state of the gusset plate is mainly determined by the degree of compaction between the gusset plates, so the state of the gusset plate obtained by the above method is not accurate

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  • High-strength bolt connecting gusset plate compression detection method
  • High-strength bolt connecting gusset plate compression detection method
  • High-strength bolt connecting gusset plate compression detection method

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[0035] The thickness of splicing plate 10 is 40mm, the surface is airless sprayed with 160μm inorganic zinc-rich paint, and four high-strength bolt holes are reserved; the high-strength bolts are S10.9 grade M24 large hexagon head bolts, E=1GPa, μ=0.38, D=1.53, G=1e-10.

[0036] According to different high-strength bolt screwing sequences, two sets of test pieces are completed twice to complete the field test. Number the times of ultrasonic testing from 1 to 5 during the testing process. The four high-strength bolts are numbered from 1 to 4 in the clockwise direction, and screwed to 230KN in sequence. The tension sequence of the high-strength bolts during the experiment of each group of specimens is shown in Table 1.

[0037] Table 1 Tightening sequence of high-strength bolts during the experiment (unit: KN)

[0038]

[0039] Read the ultrasonic echo data in the non-destructive testing flaw detector, sequentially extract the sound intensity values ​​of the two echoes in t...

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Abstract

The invention discloses a high-strength bolt connecting gusset plate compression detection method. The method includes the following steps: conducting an ultrasonic detection on a splice plate which has unscrewed nut by using an ultrasonic lossless defecting detector, computing an ultrasonic echo loss rate r' when the nut is not screwed; screwing the nut so as to generate a pressure among the splice plate, conducting an ultrasonic detection on the splice plate which has nut screwed by using the ultrasonic lossless defecting detector, computing to obtain an ultrasonic echo loss rate r when screwing the nut; based on the r' and r, obtaining an actual contact area among the splice plates; and based on the actual contact area among the splice plates, computing the compression of the splice plate. According to the invention, the method can measure the compression of the high-strength bolt connecting gusset plate in a direct, quick and accurate manner, and obtains accurate state of gusset plate.

Description

technical field [0001] The invention belongs to the field of evaluation and detection of the state of high-strength bolt gusset plates, and in particular relates to a method for detecting the compression degree of high-strength bolt connection gusset plates based on ultrasonic echo. Background technique [0002] With the country's vigorous promotion of steel structures, steel structures have been widely used in various industries. The high-strength bolted gusset plate is a very common connection structure for steel structures, and its function is to transmit the nodal force through the frictional resistance between the compressed connecting plates. [0003] The evaluation methods for the construction and operation quality of high-strength bolt gusset plates at home and abroad include torque wrench method, elongation value method and ultrasonic stress measurement method based on the principle of acoustic elasticity. The method indirectly infers the technical state of the gus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/25G01L5/00
CPCG01L1/255G01L5/0076
Inventor 陈小佳郭新崔太雷蔡宇清李南南
Owner WUHAN UNIV OF TECH
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