CN108445074B - Device and method for testing concrete crack repairing effect - Google Patents
Device and method for testing concrete crack repairing effect Download PDFInfo
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- CN108445074B CN108445074B CN201810111670.9A CN201810111670A CN108445074B CN 108445074 B CN108445074 B CN 108445074B CN 201810111670 A CN201810111670 A CN 201810111670A CN 108445074 B CN108445074 B CN 108445074B
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- 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
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/26—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring depth
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Abstract
The invention discloses a device and a method for testing the concrete crack repairing effect, wherein the device comprises a support, a measuring hole, a depth rod and a main controller, the depth rod is inserted into the measuring hole through a through hole of the support, the depth rod is provided with a magnetic probe, the device also comprises a depth measuring device, and the magnetic probe and the depth measuring device are in data connection with the main controller; the method is characterized in that magnetic grouting material is prepared and cracks are repaired, an external magnetic field is applied, a relation graph of magnetic induction intensity and depth is fitted, and inflection points are obtained. The device and the method can accurately measure the actual repaired depth of the crack of the concrete structure.
Description
Technical Field
The invention relates to the field of reinforced concrete structure repair, in particular to a device and a method for testing the repair effect of a concrete crack.
Background
The concrete material has the advantages of convenience in construction, compression resistance, fire resistance, practicability, flexibility and the like, so that the concrete material is one of the building materials with the largest consumption and the widest application at present. However, in the service process of concrete materials, structural and non-structural cracks are generated due to the action of various internal and external factors such as plastic shrinkage, dry shrinkage, structural deformation, external load and the like. After the crack is generated and expanded to a certain degree, if the crack is not repaired in time, the safety, durability and normal use of the structure are damaged, and if the crack is expanded and penetrated, even disastrous accidents can be caused. At present, cement mortar or epoxy resin is generally used as grouting materials to be grouted into cracks, so that the aims of restoring structural integrity, durability and waterproofness are fulfilled.
In the actual construction process of repairing cracks in the prior art, technicians estimate the depth according to the actual development condition of the cracks on the surface of concrete by experience, drill oblique grouting holes approximately according to the estimated depth, then use the grouting holes to grout the inside of the cracks, and consider that grout filling is finished when grout seeps out of the surfaces of the cracks. Because the crack is positioned in the concrete structure, the shape of the crack is irregular, the width of the crack is not uniform, and even the middle section of the crack has a closing-in with a steeply-reduced width, the grouting material does not reach the deepest position of the crack usually, so the actual repaired depth of the crack cannot be known at all in the repairing method in the prior art, and the actual repairing effect cannot be known naturally. That is, the prior art is not objectively available to measure or evaluate the crack repairing effect, i.e. the actual repairing depth of the crack.
Of course, the technician also proposes to use ultrasonic waves to measure the actual depth of the repaired crack, but there are many problems that the ultrasonic wave measurement result is not accurate. Firstly, the rigidity of concrete composition materials is not uniform, and a multi-gap honeycomb structure often exists, so that various adverse effects are generated on ultrasonic wave conduction; secondly, the crack has an irregular shape and is bent and closed more, which can directly cause the error of the measurement result; in addition, ultrasonic detection is also easily influenced by the steel bars in the concrete, and the arrangement mode of the probe directly influences the accuracy of the measurement result and the applicability of the method. In conclusion, there is still no effective means for obtaining the actual repair depth of the crack.
Disclosure of Invention
The invention aims to solve the technical problem of providing a concrete crack repairing effect testing device which can accurately measure the actual repaired depth of a crack of a concrete structure.
The invention provides a device for testing the repairing effect of a concrete crack, which comprises a support fixed on the surface of a concrete structure, a measuring hole drilled in the concrete structure and positioned near the crack, a depth rod used for extending into the measuring hole, and a main controller, wherein the support is provided with a through hole communicated with the measuring hole, the depth rod is inserted into the measuring hole through the hole, the head of the depth rod is provided with a magnetic probe, the device also comprises a depth measuring device used for measuring the insertion depth of the depth rod, and the magnetic probe and the depth measuring device are in data connection with the main controller.
Another technical problem to be solved by the present invention is to provide a method for testing the repairing effect of a concrete crack, which can accurately measure the actual repaired depth of the crack of a concrete structure.
Another technical solution of the present invention is to provide a method for testing a concrete crack repairing effect, comprising the steps of:
mixing the magnetic particles, the active agent and the conventional grouting material to form a magnetic grouting material;
drilling a measuring hole on the surface of the concrete structure near the crack, and installing an inspection device on the surface of the concrete structure;
grouting the magnetic grouting material into cracks of a concrete structure, and applying an external magnetic field in the grouting process to magnetize the magnetic grouting material;
the depth rod is inserted into the measuring hole, and in the process that the depth rod advances along the measuring hole, the depth measuring device sends the insertion depth of the depth rod to the main controller in real time, and the magnetic probe at the front end of the depth rod also sends the magnetic induction strength measured in real time to the main controller;
the main control unit carries out real-time supervision to magnetic induction intensity, and along with the degree of depth pole gos forward, magnetic induction intensity also vibrates in certain extent, and when magnetic induction intensity appeared when attenuating by a wide margin, main control unit can discern normal vibration and attenuate the inflection point between by a wide margin, and the depth of insertion of the degree of depth pole that this inflection point corresponds is cracked actual repair depth promptly.
Compared with the prior art, the device and the method for testing the concrete crack repairing effect have the following advantages.
The principle of the inspection device and the method is that magnetic particles, an activating agent and base carrier liquid are firstly mixed into magnetic liquid and are doped into conventional grouting material to form magnetic grouting material, then the magnetic grouting material is randomly and uniformly distributed in the grouting material by utilizing the fluidity of the magnetic liquid and is poured into cracks, and an external magnetic field is applied to the magnetic liquid by utilizing the superparamagnetism of the magnetic liquid to ensure that the magnetic particles are arranged in a quasi-linear chain shape along the direction of the magnetic field, namely the magnetic grouting material is magnetized; therefore, along with the continuous pushing of the depth rod, in the process that the magnetic probe advances along the measuring hole, if the magnetic grouting material exists in the crack at the depth, the magnetic probe can sense the magnetic field of the grouting material at the depth, the reaction is that the magnetic induction intensity continuously fluctuates in a normal range, and once the depth of the magnetic probe exceeds the depth reached by the magnetic grouting material, the magnetic induction intensity collected by the magnetic probe can be suddenly reduced in a cliff mode, so that the depth corresponding to the inflection point between the normal fluctuation and the sudden reduction of the magnetic induction intensity is the actual depth reached by the grouting material, namely the repairing depth of the crack. Therefore, the technical scheme can accurately measure the actual repaired depth of the crack of the concrete structure, accurately and effectively evaluate the repairing effect of the crack, provide reliable basis and data support for further repairing the crack subsequently, ensure the safety and durability of the concrete structure and reduce the probability of catastrophic accidents.
Preferably, the depth measuring device comprises two racks respectively arranged at two sides of the depth rod and two gears respectively rotatably arranged at two sides of the through hole of the support, and the two racks of the depth rod are respectively meshed with the two gears at two sides of the through hole of the support; a rotating speed encoder for measuring the number of turns of rotation of the gears is arranged at the wheel shaft of each gear and is in signal connection with the main controller; therefore, in the process that the depth rod is pushed to advance, the gear is driven to rotate through the rack, the rotation angle of the gear is collected by the rotating speed encoder and fed back to the main controller, and the conversion between the rotation angle and the advancing depth is carried out, so that the real-time monitoring of the actual depth of the probe is realized; the left and right symmetrical gears have two functions, namely, two rotating angles and corresponding depths are provided, so that the system can acquire the average value between the two depths, and further more accurate measurement and evaluation effects are obtained; moreover, the two gears engage the depth rod at the middle position to play a role in positioning and guiding the depth rod, so that the depth rod can be conveniently and directly inserted into the measuring hole, and the accuracy of the structure inspection is further improved.
Preferably, the support comprises a bottom plate which is fixedly bonded on the surface of the concrete structure and a mounting plate for mounting the gear and the rotating speed encoder, a sucker is fixed on the mounting plate, and the mounting plate is fixed with the bottom plate through the sucker; the advantage of design like this lies in, mend thick liquid and accomplish the back, can convenient and fast take away more expensive encoder and installation gear along with the mounting panel, the follow-up circulation of being convenient for is recycled, and the bottom plate of low price just stays on concrete structure surface, that is to say, has both solved the installation fixed problem on device and concrete surface, convenient to detach again recycles.
As an improvement, the tail part of the magnetic probe is provided with a front plug for being spliced with the depth rod, the rear part of the depth rod is provided with a magnetic induction strength signal transmitting module, the front part of the magnetic induction strength signal transmitting module is provided with a rear plug for being spliced with the depth rod, and the inside of the depth rod is provided with a data wire for connecting the front plug and the rear plug; the magnetic probe, the depth rod and the magnetic induction strength signal transmitting module are detachably connected through the front plug and the rear plug, so that the depth rods with different lengths can be replaced as required to adapt to the requirements of different crack depths and different concrete structure sizes.
One of the preferred methods of inspection is: after the magnetic grouting material is initially set, firstly removing the external magnetic field, then inserting the depth rod, detecting the magnetic induction intensity, obtaining the inflection point and performing subsequent operation.
Another preferred method of said assay is: the key point of the step is that the insertion of a magnetic probe, the acquisition of magnetic induction strength, the fitting of a relation graph of the magnetic induction strength and depth and the acquisition of the inflection point are synchronously carried out in the grouting process without removing an external magnetic field, so that although the magnetic induction strength in the fitting graph is simultaneously influenced by two magnetic fields of the external magnetic field and a grouting material curing magnetic field, the magnetic induction strength acquired by the magnetic probe is basically superposed by the two magnetic fields, and in the grouting depth in the fitting graph, the magnetic induction strength is approximately fluctuated along a downward-bending arc line which is firstly reduced and then raised, but once the actual depth of grouting is exceeded, the magnetic induction strength can still be obviously and steeply reduced, and the inflection point can be found clearly and visually; the advantage of synchronously measuring the actual grout filling depth during grout filling is that if the depth of grout filling needs to be known in advance, such as a water leakage penetrating crack, and the depth of the grout filling needs to be the thickness of a wall body, whether the actual grouting depth is equal to the depth of the grout filling needs to be judged through monitoring the actual grouting depth in real time, if the actual grouting depth is not enough, pressurized grouting is continued, and the final actual grouting depth is ensured to be equal to the depth of the grout filling needs to be repaired.
Preferably, the magnetic particles are Fe3O4Powder, oleic acid as an active agent, and 1 part by weight of Fe3O4Mixing and stirring the powder, 1 part by weight of oleic acid and 10 parts by weight of water to form a magnetic suspension, then adding the magnetic suspension into 20 parts by weight of cement, and uniformly stirring to form the magnetic cement mortar grouting material. The components and the proportion are convenient to manufacture and use, and the fluidity and the superparamagnetism are good.
Another preferred magnetic grouting material is that the magnetic particles are Fe3O4Powder, oleic acid as an active agent, and 1 part by weight of Fe3O4The powder, 1 part by weight of oleic acid and 20 parts by weight of epoxy resin are mixed and uniformly stirred to form the magnetic epoxy resin grouting material, the grouting material prepared by the method also has good fluidity and superparamagnetism, and the preparation process only needs one-time stirring, so that the method is more convenient and rapid.
Drawings
FIG. 1 is a schematic structural diagram of a concrete crack repairing effect testing device according to the present invention.
FIG. 2 is a schematic structural view in cross section from the top of the apparatus for testing the effect of repairing concrete cracks according to the present invention.
FIG. 3 is a fitting graph of the magnetic induction intensity and the insertion depth under the action of a single magnetic field of the method for testing the concrete crack repairing effect of the testing device of the invention.
FIG. 4 is a fitting graph of the magnetic induction intensity and the insertion depth under the action of a double magnetic field of the method for testing the concrete crack repairing effect of the testing device of the invention.
The device comprises a concrete structure 1, a concrete structure 2, a support 2.1, a bottom plate 2.2, a mounting plate 3, a crack 4, a measuring hole 5, a depth rod 5.1, a data line 6, a via hole 7, a magnetic probe 7.1, a front plug 8, a rack 9, a gear 10, a sucker 11, a rotary signal transmitting module 12, a magnetic induction intensity signal transmitting module 12.1 and a rear plug.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1, 2, 3 and 4, the apparatus for checking the repairing effect of a concrete crack of the present invention comprises a support 2 fixed on the surface of a concrete structure 1, a measuring hole 4 drilled inside the concrete structure 1 and located near the crack 3, a depth rod 5 for extending into the measuring hole 4, and a main controller.
The position near the crack 3 means that the measuring hole 4 and the crack 3 are kept within a certain distance, such as within 2-3 cm, so that the magnetic probe 7 can sense the magnetic field of the magnetic grouting material at the crack 3.
Being equipped with the via hole 6 with measuring hole 4 intercommunication on the support 2, degree of depth pole 5 is through in 6 insertion measuring holes 4 of via hole, and the head of degree of depth pole 5 is equipped with magnetic probe 7, and this verifying attachment still includes the degree of depth measuring device who is used for measuring the depth of insertion of degree of depth pole 5, and magnetic probe 7 and degree of depth measuring device all with main control unit data connection.
The depth measuring device comprises two racks 8 respectively arranged at two sides of the depth rod 5 and two gears 9 respectively rotatably arranged at two sides of the through hole 6 of the support 2, and the two racks 8 of the depth rod 5 are respectively meshed with the two gears 9 at two sides of the through hole 6 of the support 2; and a rotating speed encoder for measuring the rotating number and the rotating angle of the gear 9 is arranged at the wheel axle of each gear 9 and is in signal connection with the main controller. Specifically, the rotation speed encoder is provided with a rotation signal transmitting module 11, and the main controller is provided with a rotation signal receiving module. Of course, the depth measuring device may also be provided with a coil wound around the wheel shaft, instead of the encoder, the magnet is fixed on the wheel shaft, when the wheel shaft drives the magnet to rotate, the magnetic flux of the coil changes inevitably, the coil induces a pulse, and the number of recorded pulses is the number of revolutions of the gear 9. Naturally, the depth measuring device is also provided with a rotation signal emitting module 11.
The concrete structure of the support 2 comprises a bottom plate 2.1 which is bonded and fixed on the surface of the concrete structure 1 and made of organic glass materials and a mounting plate 2.2 used for mounting a gear 9 and a rotating speed encoder, wherein a suction cup 10 is fixed on the mounting plate 2.2, and the mounting plate 2.2 is fixed with the bottom plate 2.1 through the suction cup 10.
The magnetic probe 7 is externally wrapped by a protective sleeve and internally provided with a Hall element and an amplifying circuit, the tail part of the magnetic probe 7 is provided with a front plug 7.1 which is used for being connected with the depth rod 5 in an inserting mode, the rear part of the depth rod 5 is provided with a magnetic induction intensity signal transmitting module 12, the front part of the magnetic induction intensity signal transmitting module 12 is provided with a rear plug 12.1 which is used for being connected with the depth rod 5 in an inserting mode, and the inside of the depth rod 5 is provided with a data line 5.1 which is used for connecting the front plug 7.1 with the rear plug 12.1.
The main controller is provided with a signal receiving module for receiving the rotation signal and the magnetic induction intensity signal and converting the rotation signal into the insertion depth of the magnetic probe 7. And the main controller is connected with a display, and the main controller establishes a coordinate system by taking the magnetic induction intensity as a y axis and the insertion depth of the magnetic probe 7 as an x axis and fits into a corresponding relation graph of the magnetic induction intensity and the insertion depth.
As shown in fig. 1, 2 and 3, the steps of an embodiment of the method for testing the effect of repairing a concrete crack based on the testing device of the present invention are as follows.
a. The magnetic particles, the activator, and a conventional grouting material such as cement mortar or epoxy resin are mixed to form a magnetic grouting material.
One preferred type of magnetic grouting material is: the magnetic particles being Fe3O4Powder, oleic acid as an active agent, and 1 part by weight of Fe3O4Mixing and stirring the powder, 1 part by weight of oleic acid and 10 parts by weight of water to form a magnetic suspension, then adding the magnetic suspension into 20 parts by weight of cement, and uniformly stirring to form the magnetic cement mortar grouting material.
Another preferred magnetic grouting material is that the magnetic particles are Fe3O4Powder, oleic acid as an active agent, and 1 part by weight of Fe3O4And mixing and uniformly stirring the powder, 1 part by weight of oleic acid and 20 parts by weight of epoxy resin to form the magnetic epoxy resin grouting material.
b. A measuring hole 4 is drilled on the surface of the concrete structure 1 near the crack 3, and an inspection device is installed on the surface of the concrete structure 1.
c. The magnetic grouting material is grouted into the crack 3 of the concrete structure 1, and an external magnetic field is applied in the grouting process to magnetize the magnetic grouting material; specifically, two rows of magnets can be fixed on two sides of the wall respectively to form a uniform and stable external magnetic field, so that the magnetic grouting material in the middle is magnetized. And (4) after the magnetic grouting material is initially solidified, removing the external magnetic field.
Of course, it is known from general knowledge that the sequence of the above steps abc can be flexibly adjusted, the measuring hole 4 can be drilled and the inspection device can be installed, then the magnetic grouting material is prepared, and the crack 3 is repaired, or the magnetic grouting material is prepared and the crack 3 is repaired, then the measuring hole 4 is drilled and the inspection device is installed.
d. The depth rod 5 is inserted into the measuring hole 4, and in the process that the depth rod 5 advances along the measuring hole 4, the depth measuring device sends the insertion depth of the depth rod 5 to the main controller in real time, and the magnetic probe 7 at the front end of the depth rod 5 also sends the magnetic induction strength measured in real time to the main controller. More specifically, when the depth rod 5 advances, the rack 8 drives the gear 9 to rotate, the encoder collects rotation signals and sends the rotation signals to the main controller, the main controller converts the rotation angle into the insertion depth, the insertion depth is introduced into the x axis, the magnetic induction intensity signals are received by the main controller and then introduced into the y axis, and therefore a corresponding relation graph of the magnetic induction intensity and the insertion depth is fitted.
e. The main control unit carries out real-time supervision to magnetic induction intensity, and along with degree of depth pole 5 gos forward, magnetic induction intensity also vibrates in certain extent, and when magnetic induction intensity appeared when attenuating by a wide margin, the main control unit can discern normal oscillation and attenuate by a wide margin between the inflection point, and the depth of insertion of the degree of depth pole 5 that this inflection point corresponds is the actual repair depth of crack 3 promptly.
After the crack 3 is repaired, the external magnetic field is removed after the magnetic grouting material is initially set, so that the magnetic field sensed by the magnetic probe 7 in the subsequent process is the magnetic field after the grouting material is magnetized, the fitted relation graph about the magnetic induction intensity and the entering depth is visual and clear, the magnetic induction intensity fluctuates along with the depth in the range along a transverse line basically in the actual depth of the grouting material, and once the actual depth of the grouting material is exceeded, the magnetic induction intensity is reduced in a cliff-breaking mode, so that the inflection point is clear at a glance.
The present embodiment focuses on detecting the actual slurry replenishing depth after slurry replenishing is completed, so as to evaluate the actual slurry replenishing effect.
And after the actual repairing depth is measured, the measuring hole 4 is refilled. The measuring hole 4 is integrated in shape, so that the measuring hole can be easily and thoroughly filled without influencing the normal function and the service life of a building.
As shown in fig. 1, 2 and 4, another embodiment of the method for testing the repairing effect of the concrete crack based on the testing device of the present invention has the same main steps as the previous embodiment, and the only difference is that: the external magnetic field is not removed, but the insertion of the magnetic probe 7, the acquisition of the magnetic induction strength, the fitting of the relation graph of the magnetic induction strength and the depth and the acquisition of the inflection point are synchronously performed in the grouting process. Thus, although the magnetic induction intensity in the fitting graph is simultaneously influenced by the external magnetic field and the grouting material magnetizing magnetic field, the magnetic induction intensity acquired by the magnetic probe is basically the superposition of the two magnetic fields. For an external magnetic field, the dense magnetic induction intensity of the magnetic induction lines of the magnet parts arranged on the two sides is high, the relatively sparse magnetic induction intensity of the magnetic induction lines in the middle is low, and the magnetic field magnetized by the grouting material is a magnetic field which is approximately fluctuated horizontally, so that after the two magnetic fields are superposed, the magnetic induction intensity is approximately fluctuated along a downward arc line which is firstly decreased and then increased in the actual depth of grouting in a fitting graph. However, once the actual depth of the slurry supplement is exceeded, the magnetic induction intensity still drops obviously and sharply, and the inflection point can be found clearly and intuitively.
The present embodiment focuses on: and measuring the actual slurry supplementing depth synchronously during slurry supplementing. Therefore, if the depth of the grout needing to be repaired, such as the depth of a water leakage penetrating crack, is known in advance and the depth of the grout needing to be repaired is the thickness of the wall, whether the actual repairing depth is equal to the depth of the grout needing to be repaired can be judged by monitoring the actual grouting depth in real time, if the actual repairing depth is not equal to the depth of the grout needing to be repaired, pressurized grouting is continued, and the final actual repairing depth is ensured to be equal to the depth of the grout needing to be repaired.
Claims (7)
1. The utility model provides a concrete crack repair effect's verifying attachment which characterized in that: the device comprises a support (2) fixed on the surface of a concrete structure (1), a measuring hole (4) drilled in the concrete structure (1) and located near a crack (3), a depth rod (5) used for extending into the measuring hole (4) and a main controller, wherein a through hole (6) communicated with the measuring hole (4) is formed in the support (2), the depth rod (5) is inserted into the measuring hole (4) through the through hole (6), a magnetic probe (7) is arranged at the head of the depth rod (5), the device also comprises a depth measuring device used for measuring the insertion depth of the depth rod (5), and the magnetic probe (7) and the depth measuring device are in data connection with the main controller;
the depth measuring device comprises two racks (8) which are respectively arranged on two sides of the depth rod (5) and two gears (9) which are respectively rotatably arranged on two sides of the through hole (6) of the support (2), and the two racks (8) of the depth rod (5) are respectively meshed with the two gears (9) on two sides of the through hole (6) of the support (2); a rotating speed encoder for measuring the number of turns of rotation of the gear (9) is arranged at the wheel shaft of each gear (9), and the rotating speed encoder is in signal connection with the main controller;
the support (2) comprises a bottom plate (2.1) which is fixedly bonded on the surface of the concrete structure (1) and a mounting plate (2.2) which is used for mounting the gear (9) and the rotating speed encoder, a sucker (10) is fixed on the mounting plate (2.2), and the mounting plate (2.2) is fixed with the bottom plate (2.1) through the sucker (10).
2. The device for testing the repairing effect of concrete cracks according to claim 1, wherein: the tail of the magnetic probe (7) is provided with a front plug (7.1) which is used for being connected with the depth rod (5) in an inserting mode, the rear of the depth rod (5) is provided with a magnetic induction intensity signal emitting module (12), the front of the magnetic induction intensity signal emitting module (12) is provided with a rear plug (12.1) which is used for being connected with the depth rod (5) in an inserting mode, and the depth rod (5) is internally provided with a data line (5.1) which is used for being connected with the front plug (7.1) and the rear plug (12.1).
3. A method for testing the repairing effect of a concrete crack based on the testing device of claim 1, which is characterized in that: the method comprises the following steps:
mixing the magnetic particles, the active agent and the conventional grouting material to form a magnetic grouting material;
drilling a measuring hole (4) on the surface of the concrete structure (1) near the crack (3), and installing a testing device on the surface of the concrete structure (1);
the magnetic grouting material is grouted into the crack (3) of the concrete structure (1), and an external magnetic field is applied in the grouting process to magnetize the magnetic grouting material;
the depth rod (5) is inserted into the measuring hole (4), and in the process that the depth rod (5) advances along the measuring hole (4), the depth measuring device sends the insertion depth of the depth rod (5) to the main controller in real time, and the magnetic probe (7) at the front end of the depth rod (5) also sends the magnetic induction strength measured in real time to the main controller;
the main control unit carries out real-time supervision to magnetic induction intensity, advances along with degree of depth pole (5), and magnetic induction intensity also vibrates in certain range, and when magnetic induction intensity appeared when weakening by a wide margin, the main control unit can discern normal oscillation and the inflection point between the weakening by a wide margin, and the depth of insertion of the degree of depth pole (5) that this inflection point corresponds is the actual repair depth of crack (3) promptly.
4. The method for inspecting the repairing effect of the concrete cracks according to claim 3, wherein: after the magnetic grouting material is initially set, the external magnetic field is removed, and then the depth rod (5) is inserted, the magnetic induction strength is detected, an inflection point is obtained, and the subsequent operation is performed.
5. The method for inspecting the repairing effect of the concrete cracks according to claim 3, wherein: and (3) in the process of grouting the magnetic grouting material into the crack (3) of the concrete structure (1), synchronously inserting the depth rod (5), detecting the magnetic induction intensity, obtaining an inflection point and performing subsequent operation.
6. The method for inspecting the repairing effect of the concrete cracks according to claim 3, wherein: the magnetic particles being Fe3O4Powder, oleic acid as an active agent, and 1 part by weight of Fe3O4The powder, 1 part by weight of oleic acid and 10 parts by weight of water were mixed and stirredAnd then mixing the magnetic suspension into 20 parts by weight of cement, and uniformly stirring to form the magnetic cement mortar grouting material.
7. The method for inspecting the repairing effect of the concrete cracks according to claim 3, wherein: the magnetic particles being Fe3O4Powder, oleic acid as an active agent, and 1 part by weight of Fe3O4And mixing and uniformly stirring the powder, 1 part by weight of oleic acid and 20 parts by weight of epoxy resin to form the magnetic epoxy resin grouting material.
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| JPH0726512B2 (en) * | 1989-12-29 | 1995-03-22 | 地熱技術開発株式会社 | Three-dimensional detection system of bear shape and existing cracks in the crust using artificial magnetic field |
| JPH1164293A (en) * | 1997-08-19 | 1999-03-05 | Koji Otsuka | Method for magnetically non-destructively inspecting crack of concrete |
| CN100489560C (en) * | 2006-03-10 | 2009-05-20 | 南京大学 | Method for detecting reinforcing bar cage length in concrete pouring pile by magnetic logging method |
| CN101614518A (en) * | 2009-06-30 | 2009-12-30 | 江苏方建工程质量鉴定检测有限公司 | Method for measuring length of reinforcing cage of concrete poured pile by potentials |
| CN101591921A (en) * | 2009-06-30 | 2009-12-02 | 江苏方建工程质量鉴定检测有限公司 | Method for detecting length of reinforcing cage of concrete poured columnar pile through magnetic field intensity |
| CN203808986U (en) * | 2014-01-27 | 2014-09-03 | 湖北中南勘察基础工程有限公司 | Detection device applied to recording stratigraphic fluctuation in prospecting drilling |
| GB201407796D0 (en) * | 2014-05-02 | 2014-06-18 | Univ Strathclyde | Magnetic grout detection method and system |
| CN206906054U (en) * | 2017-07-12 | 2018-01-19 | 王佳锋 | A kind of agricultural planting Soil K+adsorption sampler |
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2018
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