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Underground space crack monitoring device and method

A technology for underground space and monitoring devices, applied in measuring devices, instruments, scientific instruments, etc., can solve problems such as engineering hazards, achieve flexible layout, mature construction technology, and reliable design principles

Pending Publication Date: 2021-08-17
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies of the prior art, the present invention provides an underground space crack monitoring device and method based on the theoretical system of conductive concrete materials, so as to solve the technical problem of engineering hazards caused by underground space structural cracks

Method used

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  • Underground space crack monitoring device and method

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Experimental program
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Effect test

Embodiment 1

[0040] Please refer to figure 1 and figure 2 , this embodiment provides an underground space crack monitoring device, including:

[0041] (1) Material preparation of the conductive sensing strip: ordinary portland cement (density 3.10g / cm3); natural river sand for sand; 15mm PAN-based carbon fiber for carbon fiber with a density of 1.76g / cm3 and a diameter of 7μm; methyl cellulose And defoamer as a dispersant, fully disperse with carbon fiber in water, and then stir together with cement and sand; among them, the mixing amount of cement and sand is 1:1.

[0042] (2) Preparation of conductive sensing strips: Arrange the uniformly stirred intelligent sensing materials in lengths of 3m, 2.9m, and 2.8m, and arrange strips with a width of 1cm from the outside to the inside (with a spacing of 0.1m), and fill them in the underground space Among the construction joints and deformation joints reserved for the structure, the numbers are the conductive sensing strip 7 numbered 1, the c...

Embodiment approach

[0047] (1) The computer control terminal 4 issues a command to supply power to the DC power supply 12 .

[0048](2) The DC resistance test module 11 measures the resistance value of the conductive sensing strip 7 numbered 1, the conductive sensing strip 8 numbered 2, and the conductive sensing strip 9 numbered 3. If the conductive sensing strip 7 numbered 1, the conductive sensing strip 8 numbered 2, and the conductive sensing strip 9 numbered 3 are structurally intact and their resistance value is close to 0; if the conductive sensing strip 7 numbered 1 and the conductive sensing strip 9 numbered 2 The resistance value of one or more of the conductive sensing strip 8 and the conductive sensing strip 9 numbered 3 increases, indicating that the structure where the conductive sensing strip is located is cracked or there is a possibility of crack development. In order to further improve the monitoring accuracy, it is necessary to set the resistance threshold in advance. When the ...

Embodiment 2

[0053] In the underground space crack monitoring device provided in this embodiment, only one conductive sensing strip is laid in the reserved seam of the same section, and a conductive sensing strip circuit is constructed to monitor the resistance of the conductive sensing strip. The number of conductive sensing strips of the present invention is not fixed, and can be set according to needs.

[0054] In order to improve the installation speed of the device, the air-dried conductive sensing strip can be prepared in advance, and the bottom of the conductive sensing strip and the reserved seam can be fixed together with cement as an adhesive, so that the conductive sensing strip can be quickly installed.

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Abstract

The invention provides an underground space crack monitoring device and method, and the device comprises a conductive sensing strip which is fixedly laid in a reserved seam of a to-be-detected underground space; two ends of the conductive sensing strip are provided with electrodes, and the electrodes at the two ends of the conductive sensing strip are connected with a direct-current power supply module; a connection loop of the conductive sensing strip and the DC power supply module is connected in series with a DC resistance test module. The DC resistance test module is in communication connection with the control terminal. According to the method, the stress-strain state of the structure can be mastered during construction and operation of the underground space structure, the occurrence and development process of the structure crack can be analyzed, and an accurate space position is provided for objectively and accurately judging whether the underground space structure crack affects or destroys the structure stability and reinforcing treatment of the structure crack.

Description

technical field [0001] The invention belongs to the technical field of large-scale concrete structure crack detection and evaluation, and in particular relates to an underground space crack monitoring device and method. Background technique [0002] With the development of urban rail transit construction, the construction scale of urban underground space structures such as subway stations, underground shopping malls, and underground factories continues to expand. However, the mechanical characteristics of the underground space structure are different from the above-ground space structure. It not only bears the self-weight stress from the upper structure, but also resists the ground stress and water pressure from the surrounding and bottom of the underground structure, and the force is permanent and eternal. However, under these complex surrounding environmental loads, the underground space structure is prone to structural cracks in its weak areas; at the same time, if the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04G01N27/20
CPCG01N27/041G01N27/20
Inventor 武科邢志豪杨涛李国栋徐嘉祥杨洪娜罗浩天
Owner SHANDONG UNIV
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