Experimental method for testing transformation relationship between pretightening torque and pretightening force of anchor bolt

A test method and pre-tightening force technology, applied in the direction of measuring torque/torsion force, force/torque/power measuring instrument, force sensor related to bearings, etc. during tightening, so as to achieve the test operation process is simple and easy, and the test method is scientific and reasonable Effect

Inactive Publication Date: 2016-09-07
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Indoor test is the main research method to obtain the anchoring performance of bolts. Designing a reasonable indoor test method, obtaining relevant test data, and analyzing the relationship and change law between the pre-tightening torque and pre-tightening force of the bolt are essential for a comprehensive understanding of prestressed bolts. It is of great significance to guide the anchoring performance and guide the anchoring engineering practice, but there is no research on the conversion relationship between anchor preload and preload torque in the prior art

Method used

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  • Experimental method for testing transformation relationship between pretightening torque and pretightening force of anchor bolt
  • Experimental method for testing transformation relationship between pretightening torque and pretightening force of anchor bolt
  • Experimental method for testing transformation relationship between pretightening torque and pretightening force of anchor bolt

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a. Pouring a cuboid concrete sample 1 with a size of 30 cm×30 cm×120 cm. The material used in concrete sample 1 and its ratio are water:cement:quartz sand=0.36:1:1; after concrete sample 1 is cured for 14 days , drill a bolt hole 4 with a diameter D of 30 mm and a depth of 1000 mm on its central axis; the bolt 2 used in the test is taken from the coal mine of Jining No. The quantity E is 220GPa, and a strain gauge 3 is pasted every 10cm on the free section of the anchor rod body, a total of 5 strain gauges.

[0029] b. Pour the anchoring agent 5 into the bolt hole 4. The anchoring agent 5 used in the test is cement mortar of water: cement: fine sand = 0.5: 1: 0.6, and the anchoring length is 0.5m; after the anchoring agent 5 is poured, quickly put The anchor rod 2 is inserted into the anchor rod borehole 4 and fully contacted with the anchoring agent 5; the finished anchoring material sample is kept in a cool place for 14 days.

[0030] c Install the backing plate 6 an...

Embodiment 2

[0036] a. Pouring a cuboid concrete sample 1 with a size of 30 cm×30 cm×120 cm. The material used in concrete sample 1 and its ratio are water:cement:quartz sand=0.36:1:1; after concrete sample 1 is cured for 14 days , drill a bolt hole 4 with a diameter D of 30 mm and a depth of 1000 mm on its central axis; the bolt 2 used in the test is taken from the coal mine of Jining No. The quantity E is 220GPa, and a strain gauge 3 is pasted every 10cm on the free section of the anchor rod body, a total of 5 strain gauges.

[0037] b. Pour the anchoring agent 5 into the bolt hole 4. The anchoring agent 5 used in the test is cement mortar of water: cement: fine sand = 0.5: 1: 0.6, and the anchoring length is 0.5m; after the anchoring agent 5 is poured, quickly put The anchor rod 2 is inserted into the anchor rod borehole 4 and fully contacted with the anchoring agent 5; the finished anchoring material sample is kept in a cool place for 14 days.

[0038] c Apply butter to the thread at ...

Embodiment 3

[0044] a. Pouring a cuboid concrete sample 1 with a size of 30 cm×30 cm×120 cm. The material used in concrete sample 1 and its ratio are water:cement:quartz sand=0.36:1:1; after concrete sample 1 is cured for 14 days , drill a bolt hole 4 with a diameter D of 30 mm and a depth of 1000 mm on its central axis; the bolt 2 used in the test is taken from the coal mine of Jining No. The quantity E is 220GPa, and a strain gauge 3 is pasted every 10cm on the free section of the anchor rod body, a total of 3 strain gauges.

[0045] b. Anchoring agent 5 is poured into the bolt hole 4. The anchoring agent 5 used in the test is cement mortar of water: cement: fine sand = 0.5: 1: 0.6, and the anchoring length is 0.8m; after the anchoring agent 5 is poured, quickly put The anchor rod 2 is inserted into the anchor rod borehole 4 and fully contacted with the anchoring agent 5; the finished anchoring material sample is kept in a cool place for 14 days.

[0046] c Install the backing plate 6 a...

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Abstract

The invention discloses an experimental method for testing the transformation relationship between the pretightening torque and the pretightening force of an anchor bolt. The experimental method comprises the following steps of: manufacturing an anchoring body sample which is formed by a concrete sample, an anchor bolt and an anchoring agent; mounting a backing plate and a locking nut on the anchor bolt in order after the anchoring agent is completely solidified; using a torque wrench to apply the pretightening torque on the locking nut, and reading the strain of a strain gauge after the reading on a strain indicator becomes stable; increasing the value of the pretightening torque to obtain strains corresponding to many groups of different pretightening torques; according to experimental data, drawing a test curve and analyzing the test law. The invention has important significance for understanding the relationship and the transformation law between the pretightening torque and the pretightening force of an anchor bolt and guiding the practice of anchoring engineering.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a test method for testing the conversion relationship between pretightening torque and pretightening force of a bolt. Background technique [0002] Prestressed anchor is the most widely used support type in anchoring projects in transportation, water conservancy and mining industries. The pre-tightening force of the anchor is realized by applying the pre-tightening torque, so there must be a specific conversion relationship between the pre-tightening torque and the pre-tightening force of the anchor. There are many factors that affect the conversion relationship between bolt pretightening torque and pretightening force, mainly including bolt diameter, anchor length, bolt thread size and processing accuracy, backing plate type and anti-friction measures. Indoor test is the main research method to obtain the anchoring performance of bolts. Designing a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00G01L5/24
CPCG01L5/0042G01L5/24
Inventor 徐荣超李建勇赵阳黄志全房敬年吕晓春于怀昌贾景超
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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