CN114922174A - Prestressed anchor cable for detecting underwater coagulation and hardening process of anchoring body and detection method - Google Patents
Prestressed anchor cable for detecting underwater coagulation and hardening process of anchoring body and detection method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000004873 anchoring Methods 0.000 title claims abstract description 38
- 230000008569 process Effects 0.000 title claims abstract description 32
- 230000015271 coagulation Effects 0.000 title claims abstract description 20
- 238000005345 coagulation Methods 0.000 title claims abstract description 20
- 238000002955 isolation Methods 0.000 claims abstract description 54
- 238000012360 testing method Methods 0.000 claims abstract description 34
- 239000004568 cement Substances 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000010276 construction Methods 0.000 claims description 18
- 238000011088 calibration curve Methods 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 101100401106 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) met-7 gene Proteins 0.000 claims description 2
- 238000004904 shortening Methods 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 claims 4
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 238000011897 real-time detection Methods 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 238000007405 data analysis Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004567 concrete Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Piles And Underground Anchors (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a prestressed anchor cable for detecting the underwater coagulation and hardening process of an anchoring body, which comprises a grouting pipe, an isolation frame and a steel strand, wherein the isolation frame is provided with an exhaust hole, a grouting pipe hole for the grouting pipe to pass through and a steel strand hole for the steel strand to pass through, the prestressed anchor cable also comprises two multi-core detection cables, and one insulated wire core in each multi-core detection cable is fixed on one isolation frame in an exposed manner. The detection method comprises the following steps of S1, calibration test, S2, field detection, S3 and data analysis. Has the advantages that: by applying the circuit principle, the feedback process basically has no time delay, and the real-time detection of the solidification and hardening process of the anchoring body can be realized; the detection function of the cement paste setting and hardening process of the underwater anchoring section is realized, and the requirements of rapidness and accuracy are met; and comparing the standard result curve with a standard result curve obtained by a calibration test to obtain the influence degree of underground water in the anchor hole on the state of the anchor body.
Description
The technical field is as follows:
the invention relates to a prestressed anchor cable for detecting an underwater coagulation and hardening process of an anchoring body and a detection method, and belongs to the field of prestressed anchor cable construction.
Background art:
in the prestressed anchor cable slope reinforcement project, the condition that underground water exists in an anchor hole directly influences the construction quality of an anchor section, and the concrete expression is that the underground water influences the setting and hardening process of cement paste, so that the strength increase process of an anchor body is different from the normal condition, and the time selection of prestressed anchor cable tensioning is influenced finally.
At present, aiming at grouting construction of an underwater anchoring section, the research direction mainly aims at the aspects of cement paste materials and grouting process, and the main purpose is to ensure the strength of a final anchoring body, a reasonable time determination method for tensioning an anchor rope in the process is not provided at present, after grouting of the anchoring section is completed, if tensioning is too early, the structure of the anchoring section is directly damaged, and tensioning is excessively conservative and delayed, so that the whole construction period is increased, and meanwhile, when an underground water seepage channel in a hole is obviously developed and a seepage phenomenon with a large flow velocity exists, a slurry loss phenomenon is possibly generated, and the grouting effect of the anchoring section is greatly influenced; because the grouting of the anchor cable is a hidden project, the grouting process and the grouting effect are difficult to visually monitor and detect, the state of the final anchor body can only be indirectly reflected through the tensioning and subsequent drawing tests, and the anchor cable with problems in the tensioning process or the subsequent drawing tests is difficult to carry out engineering remediation, which basically means that the anchor cable is failed and scrapped.
The technical specification of the supporting engineering of rock-soil anchor rod and sprayed concrete (GB 50086-2015) stipulates that when the anchor rod is constructed in a crack development and rock stratum rich in underground water, when the water seepage rate around the drilled hole of an anchoring section is high, consolidation grouting or other methods are adopted for treatment, but a method for inspecting the treatment process and the final effect is lacked at present.
The invention content is as follows:
the invention aims to provide a prestressed anchor cable for detecting the underwater setting and hardening process of an anchoring body, which is used for detecting the setting and hardening process of cement paste in an underwater anchoring section.
The invention also provides a prestress detection method for detecting the underwater setting and hardening process of the anchoring body, which is used for detecting the setting and hardening process of cement paste in the underwater anchoring section.
The invention is implemented by the following technical scheme:
the prestressed anchor cable comprises an injection pipe, at least two isolation frames, at least two steel strands and two multi-core detection cables, wherein the isolation frames are provided with exhaust holes, injection pipe holes for the injection pipe to penetrate through and steel strand holes for the steel strands to penetrate through, each multi-core detection cable is provided with an insulation wire core which is naked and fixed on one isolation frame, and the outer sides of the injection pipe, the steel strands and the multi-core detection cables between the two isolation frames are provided with a clamping ring.
Preferably, the center of the isolation frame is provided with the grouting pipe hole, the disc surface of the isolation frame is uniformly distributed with more than two exhaust holes, and the edge of the isolation frame is uniformly provided with the steel strand holes.
Preferably, the two multi-core detection cables penetrate through the grouting pipe hole, and each insulated wire core is fixed on the disc surface of the isolation frame between the grouting pipe hole and one exhaust hole in an exposed mode.
The method for detecting the prestressed anchor cable in the underwater coagulation and hardening process of the anchor body comprises the following steps,
s1, carrying out a calibration test, placing the calibration device in an environment with the same humidity and temperature as those of a construction site, and injecting cement paste prepared according to the type, the label and the admixture type doping amount of engineering cement from the top opening of the calibration device until the cement paste submerges an isolation frame in the calibration device; testing the position of each isolation frame and the integral resistance of the section by using an ohmmeter at certain time intervals, and recording the resistance value and test time data; when the cement paste quickly reaches the initial setting state and the final setting state, the test time interval is shortened, and interval measurement is continuously carried out until the resistivity is continuously measured for multiple times and is not changed; according to the calibration test, a calibration curve of the relation between the resistance value of the standard cement paste and the time change can be obtained, and the resistance values corresponding to the initial setting, final setting and stable hardening processes can be obtained by resetting;
s2, performing on-site detection, and after the grouting construction of the cable laying and anchoring sections is completed, performing resistance detection on the multi-core detection cable by using an ohmmeter at certain time intervals; the detection mode comprises two modes, one mode is that two insulated wire cores on one isolating frame are connected with an ohmmeter to measure the resistance of a certain depth position of the anchoring section, and the other mode is that the insulated wire cores on the isolating frame representing two adjacent depth positions in the same multi-core detection cable are connected with the ohmmeter to measure the resistance of the anchoring section in a certain depth range;
s3, analyzing data, comparing the relation curve of the resistance value and the time measured in S2 with the calibration curve obtained in S1, and judging the coagulation state of a certain depth position or depth range of the current anchoring body, wherein the stages can be specifically divided into stages of non-initial coagulation, final coagulation and hardening; if the initial setting time and the final setting time measured on site are different from the corresponding time of the calibration curve, the influence of the underground water in the anchor hole on the condensation of the anchor body is obvious; if the field detection result shows that the detection result of the anchor body at a certain position still does not reach the final set resistance after the grouting construction is finished for 12 hours, the fact that the cement slurry is lost due to underground water seepage is indicated, grouting of the anchor section does not meet the requirement, measures such as secondary grouting are needed, and the like; and when the field detection result judges that the total length of the anchor body enters a stable hardening state, the tensioning requirement can be met after 7 days by starting calculation at the current time according to the stipulation of tensioning after finishing grouting in the conventional anchor cable construction.
Preferably, the calibration device is a cuboid groove type structure with an open top end, the length of the calibration device is larger than the anchoring section of the anchor cable, the distance between the isolation frames is equal to the diameter of the isolation frames, the width of the isolation frames is larger than the diameter of the isolation frames, two multi-core detection cables penetrate through the grouting pipe holes, an insulating wire core is led out from each multi-core detection cable at each isolation frame position, an external insulating layer at the front end of the insulating wire core is stripped, and the multi-core detection cables are wound and fixed in the position close to the grouting pipe holes.
Preferably, in S1, the ohmmeter is used to test the resistance at the position of each isolation rack at certain time intervals, that is, the two insulated wire cores on one isolation rack are connected to the ohmmeter, and the resistance at a certain depth position of the anchoring section is measured; and testing the integral resistance of the section by using an ohmmeter at certain time intervals, namely connecting the insulated wire cores on the isolation frame representing two adjacent depth positions in the same multi-core detection cable with the ohmmeter to test the resistance of the calibration device in a certain section range.
The invention has the advantages that: compared with the prior art, the device has the advantages of simple structure, convenient use and application of the circuit principle, so that the feedback process basically has no time delay, and the real-time detection of the solidification and hardening process of the anchoring body can be realized; the detection function of the cement paste setting and hardening process of the underwater anchoring section is realized, and the requirements of rapidness and accuracy are met; the continuous detection function of the coagulation hardening process in the whole length range of the anchoring section is realized; determining reasonable tensioning time when the anchor cable exists in an underwater anchoring section; by comparing with a standard result curve obtained by a calibration test, the influence degree of underground water in the anchor hole on the state of the anchor body can be obtained, a basis is provided for judging whether secondary grouting is needed, and the optimal tensioning time after hardening is started can be judged; the anchor rod state detection device can detect the state of an anchor body at a certain depth of an anchor section, can also detect the overall state of the anchor body between any two isolation frames, and has two functions of point detection and line detection, wherein the detection range comprises the full-length range of the anchor section; the device has a simple circuit principle, only two detection lines need to be added in the anchor cable structure, the conducting wire is led out and fixed at the position of the isolation frame of the anchor section, the detection lines only need to be connected with the ohm meter in the implementation process, and the main process steps of anchor cable construction are basically not changed; due to the arrangement of the calibration test, the method of the device is suitable for different cement paste types and different construction environmental conditions, and has wide application range.
Description of the drawings:
fig. 1 is a schematic view of the entire structure of embodiment 1.
Fig. 2 is a schematic sectional view taken along line a-a of fig. 1.
Fig. 3 is a schematic sectional view taken along line B-B of fig. 1.
Fig. 4 is a schematic cross-sectional view of a multi-core detection cable.
Fig. 5 is an overall schematic view of the calibration device.
Fig. 6 is a schematic cross-sectional view taken along line C-C of fig. 5.
The specific implementation mode is as follows:
in order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms than those specifically described herein, and it will be apparent to those skilled in the art that many more modifications are possible without departing from the spirit and scope of the invention.
Example 1: as shown in fig. 1 to 4, the prestressed anchor cable for detecting the underwater coagulation and hardening process of an anchor body comprises a grouting pipe 1, at least two isolation frames 2 and at least two steel strands 3, wherein a grouting pipe hole 21 for the grouting pipe 1 to pass through is formed in the center of each isolation frame 2, more than two exhaust holes 22 are uniformly distributed on the disc surface of each isolation frame 2, and steel strand holes 23 for the steel strands 3 to pass through are uniformly formed in the edge of each isolation frame 2; the multi-core detection cable comprises two multi-core detection cables 5, wherein the two multi-core detection cables 5 penetrate through the grouting pipe hole 21, one insulating wire core 51 in each multi-core detection cable 5 is fixed on the disc surface of the isolation frame 2 between the grouting pipe hole 21 and one exhaust hole 22 of one isolation frame 2 in an exposed mode, and the outer sides of the grouting pipe 1, the steel strand 3 and the multi-core detection cables 5 between the two isolation frames 2 are provided with tightening rings 4.
Example 2: the method for detecting the prestressed anchor cable in the underwater coagulation and hardening process of the anchor body comprises the following steps,
s1, performing a calibration test, placing the calibration device 6 in an environment with the same humidity and temperature as the construction site, as shown in fig. 5 and 6, where the calibration device 6 is a rectangular groove structure with an open top end, and the length is greater than the distance between two isolation frames 2, and the distance between two isolation frames 2 is the same as the distance between two adjacent isolation frames 2 in embodiment 1; the width of the multi-core detection cable 5 is consistent with the diameter of the isolation frame 2, the height of the multi-core detection cable is larger than the diameter of the isolation frame 2, the two multi-core detection cables 5 penetrate through the grouting pipe hole 21, an insulating wire core 51 is respectively led out from the two multi-core detection cables 5 at each isolation frame 2, an external insulating layer at the front end of the insulating wire core 51 is stripped, and the multi-core detection cable is wound and fixed in the position close to the grouting pipe hole 21; injecting cement slurry prepared according to the type and the number of the cement used in the engineering and the type and the doping amount of the admixture from the top opening of the calibration device 6 until the cement slurry is submerged in an isolation frame in the calibration device; testing the overall resistance at the position of each isolation frame 2 and the section by using an ohmmeter according to a certain time interval, wherein the testing of the resistance at the position of each isolation frame 2 by using the ohmmeter according to the certain time interval is to connect two insulated wire cores 51 on one isolation frame 2 with the ohmmeter and test the resistance at a certain depth position of the anchoring section; the whole resistance of the section is tested by an ohmmeter at certain time intervals, namely, the insulated wire cores 51 representing two adjacent depth position isolation frames 2 in the same multi-core detection cable 5 are connected with the ohmmeter to test the resistance of the calibration device in a certain section range; recording resistance value and test time data; when the cement paste quickly reaches the initial setting state and the final setting state, shortening the testing time interval, and continuously carrying out interval measurement until the resistivity is not changed after continuous multiple measurements; according to the calibration test, a calibration curve of the relation between the resistance value of the standard cement paste and the time change can be obtained, and the resistance values corresponding to the initial setting, final setting and stable hardening processes can be obtained by resetting;
s2, carrying out field detection, and after the grouting construction of the lower cable and the anchoring section is finished, carrying out resistance detection on the multi-core detection cable 5 by using an ohmmeter at certain time intervals; the detection mode comprises two modes, one mode is that two insulated wire cores 51 on one isolation frame 2 are connected with an ohmmeter to measure the resistance of a certain depth position of the anchoring section, and the other mode is that the insulated wire cores 51 on the isolation frames 2 representing two adjacent depth positions in the same multi-core detection cable 5 are connected with the ohmmeter to measure the resistance of the anchoring section within a certain depth range;
s3, analyzing data, comparing the relation curve of the resistance value and the time measured in S2 with the calibration curve obtained in S1, and judging the coagulation state of a certain depth position or depth range of the current anchoring body, wherein the stages can be specifically divided into stages of non-initial coagulation, final coagulation and hardening; if the initial setting time and the final setting time measured on site are different from the corresponding time of the calibration curve, the influence of the underground water in the anchor hole on the condensation of the anchor body is obvious; if the grouting construction is finished for 12 hours, the field detection result shows that the detection result of the anchor body at a certain position still does not reach the final setting resistance, the fact that the cement slurry is lost due to underground water seepage is indicated, grouting of the anchor section does not meet the requirements, and measures such as secondary grouting are needed; and when the field detection result judges that the total length of the anchoring body enters a stable hardening state, the calculation is started at the current time according to the rule that tensioning is carried out 7 days after grouting in the conventional anchor cable construction, and the tensioning requirement can be met 7 days later.
The above examples only show several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (6)
1. The prestressed anchor cable for detecting the underwater coagulation hardening process of an anchor body comprises a grouting pipe, at least two isolation frames and at least two steel strands, wherein exhaust holes, grouting pipe holes for the grouting pipe to pass through and steel strand holes for the steel strands to pass through are formed in the isolation frames.
2. The prestressed anchor cable for detecting the underwater coagulation and hardening process of the anchored body as claimed in claim 1, wherein said grouting pipe hole is opened at the center of said isolation frame, more than two air exhaust holes are uniformly distributed on the disk surface of said isolation frame, and said steel strand holes are uniformly opened at the edge of said isolation frame.
3. The prestressed anchorage cable for detecting the underwater coagulation and hardening process of an anchorage body as claimed in any one of claims 1 or 2, wherein two multi-core detection cables are passed through said grouting pipe hole, and each of said insulated wire cores is fixed on the surface of said isolation frame plate between said grouting pipe hole and one of said exhaust holes in an exposed manner.
4. The method of claim, comprising the steps of,
s1, carrying out calibration test, placing the calibration device in an environment with the same humidity and temperature as the construction site, injecting cement paste prepared according to the type, the label and the additive type of the engineering cement from the top opening of the calibration device, and using the same water-cement ratio until the cement paste submerges the isolation frame in the calibration device; testing the position of each isolation frame and the integral resistance of the section by using an ohmmeter at certain time intervals, and recording the resistance value and test time data; when the cement paste quickly reaches the initial setting state and the final setting state, shortening the testing time interval, and continuously carrying out interval measurement until the resistivity is not changed after continuous multiple measurements; according to the calibration test, obtaining a calibration curve of the relation between the resistance value of the standard cement paste and the time change, and repeating to obtain the resistance values corresponding to the initial setting, final setting and stable hardening processes;
s2, performing on-site detection, and after the grouting construction of the cable laying and anchoring sections is completed, performing resistance detection on the multi-core detection cable by using an ohmmeter at certain time intervals; the detection mode comprises two modes, one mode is that two insulated wire cores on one isolating frame are connected with an ohmmeter to measure the resistance of a certain depth position of the anchoring section, and the other mode is that the insulated wire cores on the isolating frame representing two adjacent depth positions in the same multi-core detection cable are connected with the ohmmeter to measure the resistance of the anchoring section in a certain depth range;
s3, analyzing data, comparing the relation curve of the resistance value and the time measured in S2 with the calibration curve obtained in S1, and judging the coagulation state of a certain depth position or depth range of the current anchoring body, wherein the stages can be specifically divided into stages of non-initial coagulation, final coagulation and hardening; if the initial setting time and the final setting time measured on site are different from the corresponding time of the calibration curve, the influence of the underground water in the anchor hole on the condensation of the anchor body is obvious; if the field detection result shows that the detection result of the anchor body at a certain position still does not reach the final set resistance after the grouting construction is finished for 12 hours, the fact that the cement slurry is lost due to underground water seepage is indicated, grouting of the anchor section does not meet the requirement, measures such as secondary grouting are needed, and the like; and when the field detection result judges that the total length of the anchoring body enters a stable hardening state, the calculation is started at the current time according to the rule that tensioning is carried out 7 days after grouting in the conventional anchor cable construction, and the tensioning requirement can be met 7 days later.
5. The method as claimed in claim 4, wherein the calibration device is a rectangular slot structure with an open top, the length of the calibration device is greater than the distance between the spacers of the anchor section of the anchor cable, the width of the calibration device is equal to the diameter of the spacers, the height of the calibration device is greater than the diameter of the spacers, two multi-core test cables are respectively penetrated through the grouting pipe hole, an insulating wire core is respectively led out from the two multi-core test cables at each spacer, an external insulating layer at the front end of the insulating wire core is stripped, and the multi-core test cables are wound and fixed in the grouting pipe hole.
6. The method of claim 4, wherein in S1, the ohmmeter is used to test the resistance at each isolation frame position at certain time intervals, and the method comprises connecting two insulated wire cores on one isolation frame with the ohmmeter to test the resistance at a certain depth position of the anchoring section; and testing the integral resistance of the section by using an ohmmeter at certain time intervals, namely connecting the insulated wire cores on the isolation frame representing two adjacent depth positions in the same multi-core detection cable with the ohmmeter to test the resistance of the calibration device in a certain section range.
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| CN115752829A (en) * | 2022-11-24 | 2023-03-07 | 青岛理工大学 | Anchor cable stress monitoring device and method |
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