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Self-deformation-detection carbon fiber resin anchor rod and deformation detection method thereof

A carbon fiber, self-testing technology, applied in the direction of electric/magnetic solid deformation measurement, bolt installation, earth-moving drilling, etc., can solve problems such as increasing the difficulty and cost of detection, single anchoring effect of bolts, etc.

Active Publication Date: 2015-04-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anchor rods currently used can only play a single anchoring role, and other equipment is required to detect the deformation information of the reinforcement body, which increases the difficulty and cost of detection. Deep research

Method used

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  • Self-deformation-detection carbon fiber resin anchor rod and deformation detection method thereof
  • Self-deformation-detection carbon fiber resin anchor rod and deformation detection method thereof
  • Self-deformation-detection carbon fiber resin anchor rod and deformation detection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Determination of carbon fiber length and content

[0028] In order to obtain the required carbon fiber resin composite material, the development of the composite material is carried out in the form of laboratory experiments, with polyethylene resin as the base material and carbon fiber as the filler, such as figure 1 , 2 As shown, the length of the carbon fiber is taken as 4 mm to 6 mm, and the content of the carbon fiber is taken as 6%.

[0029] (2) Deformation-resistance relationship calibration of carbon fiber resin anchor

[0030] According to the tensile test of the conductive composite material carried out in the room, the relationship between the deformation of the composite material and the change of resistance is measured, and the functional relationship between the two is obtained: ΔR / R 0 =F(ε), where ΔR / R 0 Called the normalized resistivity, ε is the strain value.

[0031] (3) Preparation of carbon fiber resin anchor rod

[0032] Unsaturated polyeste...

Embodiment 2

[0035] Example 2: Carbon fiber resin anchor rod in tunnel engineering

[0036] The preparation steps are the same as in Example 1, except that the percentages of the total mass of the unsaturated polyester resin, marble powder, triethanolamine, carbon fiber and resin anchoring agent are: 80%, 4%: 3%: 6%, respectively.

[0037] In tunnel engineering, bolts are mainly used to provide longitudinal tension and overcome the shortcomings of insufficient tensile capacity of the rock mass. From a mechanical point of view, it shows that the cohesion and internal friction angle of the rock mass are improved to limit the shedding of the rock mass. However, due to the existence of factors such as confining pressure, the deformation of the anchor rod inside the rock mass is difficult to monitor, and eventually the tunnel will be deformed, damaged or even collapsed, resulting in loss of life and property. Regular detection with professional equipment is time-consuming, laborious, and inconve...

Embodiment 3

[0038] Example 3: Carbon Fiber Resin Anchor in Slope Retaining Wall

[0039] The preparation steps are the same as in Example 1, except that the percentages of the total mass of the unsaturated polyester resin, marble powder, triethanolamine, carbon fiber and resin anchoring agent are: 90%, 8%: 5%: 6%, respectively.

[0040] In slope engineering, the stability of the slope is very important. Therefore, the method of bolt support is usually used to strengthen the slope, which not only improves the stability but also reduces the cost. In order to better ensure the stability of the slope and facilitate the monitoring of the deformation of the slope and the anchor rod, carbon fiber resin anchor rods are used to monitor the slope during its full cycle life to prevent engineering accidents (the manufacturing process of the anchor rod is as above, and it belongs to The relationship between resistivity and strain is: ΔR / R 0 =0.102ε+0.98, as shown in the figure below). Through the ch...

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Abstract

The invention discloses a self-deformation-detection carbon fiber resin anchor rod and a deformation detection method thereof. The self-deformation-detection carbon fiber resin anchor rod mainly comprises the following raw materials: glass fibers, resin and resin anchoring agents; the glass fibers account for 70%-85% of the raw materials in percentage by weight; the resin anchoring agents consist of unsaturated polyester resin, marble powder, accelerant and carbon fibers; the mass ratio of the unsaturated polyester resin, the marble powder, the accelerant and the carbon fibers is 80-90:4-8:3-5:6; the lengths of the carbon fibers are 4mm-6mm; the content of the carbon fibers is 6% of the total weight of the resin anchoring agents; and a relational expression of normalization electrical resistivity and strain of the anchor rod is delta R / R=0.142e1.315 epsilon, delta R / R0 is the normalization electrical resistivity, and the epsilon is a strain value. The problems that deformation testing precision is reduced due to using of an external sensor and the durability of the sensor does not meet requirements are solved. The self-deformation-detection carbon fiber resin anchor rod is particularly suitable for deformation monitoring and safety early warning of a reinforcing body in a whole life cycle.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a deformation self-detection carbon fiber resin anchor rod and a deformation detection method thereof. Background technique [0002] Anchor rods are divided into wire rope anchor rods, ordinary steel bar anchor rods, threaded steel anchor rods, glass fiber reinforced plastic anchor rods, wooden anchor rods and bamboo anchor rods according to their materials. They are widely used in mines, tunnels, roads and other engineering construction support. In engineering applications, anchor rods have the functions of suspension, extrusion reinforcement, and composite beams, which can limit the separation of rock and soil from the original body, increase the cohesion of rock and soil, and at the same time support low cost and rapid construction. However, the anchor rods currently used can only play a single anchoring role, and other equipment is required to detect the deformati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D21/00G01B7/16E02D5/74
CPCC08K3/04C08K5/17C08K7/06C08K13/04C08K2201/001C08L67/06E02D5/74E21D20/025E21D21/0006E21D21/02G01B7/18
Inventor 崔新壮黄丹侯飞汤潍泽楼俊杰
Owner SHANDONG UNIV
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