CN114279937B - Nondestructive testing device for permeability resistance of concrete structure - Google Patents
Nondestructive testing device for permeability resistance of concrete structure Download PDFInfo
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- CN114279937B CN114279937B CN202111644113.1A CN202111644113A CN114279937B CN 114279937 B CN114279937 B CN 114279937B CN 202111644113 A CN202111644113 A CN 202111644113A CN 114279937 B CN114279937 B CN 114279937B
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Abstract
The invention relates to a nondestructive testing device for the permeation resistance of a concrete structure, which is used for detecting chloride ion migration coefficients and comprises a first box body and a second box body which are used in pairs, wherein the bottoms of the first box body and the second box body are provided with opening and closing mechanisms, anode plates are fixed in the first box body and are provided with conductivity detection elements, cathode plates are fixed in the second box body, the first box body and the second box body are connected with a travelling mechanism through telescopic parts so as to realize the joint and separation state switching of the first box body and the bottom surface of the second box body and the concrete structure, and the detection device does not need to damage the concrete structure.
Description
Technical Field
The invention relates to the technical field of engineering detection equipment, in particular to a nondestructive detection device for the anti-permeability performance of a concrete structure.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The existing method for detecting the permeability of the concrete structure mainly comprises the steps of chloride ion migration coefficient detection, electric flux detection and the like.
For the detection of the chloride ion migration coefficient of the concrete structure, the problems of lack of detection technology, rarity of detection devices and higher detection difficulty are presented, and most of the detection of the chloride ion migration coefficient is completed through indoor tests, wherein the methods are used for simulating raw material components of the structure to detect the chloride ion migration coefficient of a test piece with a specified size, the chloride ion migration coefficient of the structure which is already in service for a period of time on site cannot be detected, the used instrument and equipment are discretized, the detection devices and the detection auxiliary equipment cannot be combined into an integrated device, and the preparation work before the detection is quite troublesome.
The method for measuring the chloride ion migration depth and the apparent migration coefficient in concrete is provided by the CN103913401A, the chloride ion migration coefficient of the concrete structure which is in service for a period of time is measured in a laboratory after on-site core drilling sampling, and the method for layer-by-layer core drilling sampling is complicated and difficult in sampling, has higher requirements on drilling equipment and has a certain limitation in on-site implementation. Meanwhile, the structure is seriously damaged, the subsequent hole repairing is difficult, a good repairing effect cannot be ensured, and the performance of the structure for resisting the migration of chloride ions to the inside is reduced.
And for detecting the electric flux of the concrete structure, the test is carried out only on an indoor test piece. The real electric flux condition of the on-site service concrete structure cannot be accurately reflected by the indoor test, and the indoor test device cannot be applied on site. In addition, the sample for on-site damage sampling of the concrete structure is brought back to a laboratory for detection, so that the on-site damage of the concrete structure is high; meanwhile, the technical difficulty of on-site damage to the structure is high, the number of the samples is limited, and the overall electric flux condition of the on-site concrete structure is difficult to reflect to a certain extent.
In summary, the current chloridion migration coefficient detection and the current electric flux detection can only take samples on site and carry the samples back to a laboratory for detection, so that the damage to the on-site concrete structure is large, and the subsequent repair process is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a nondestructive testing device for the permeability resistance of a concrete structure, which can perform nondestructive testing on site, avoid damaging the concrete structure and further save the subsequent repair procedure.
In order to achieve the above purpose, the invention adopts the following technical scheme
According to the first aspect, the embodiment of the invention provides a concrete structure permeability resistance nondestructive testing device, which is used for detecting chloride ion migration coefficients and comprises a first box body and a second box body which are used in pairs, wherein the bottoms of the first box body and the second box body are provided with opening and closing mechanisms, anode plates are fixed in the first box body and are provided with conductivity detection elements, cathode plates are fixed in the second box body, and the first box body and the second box body are connected with a travelling mechanism through telescopic parts so as to realize the joint and separation state switching of the first box body and the bottom surface of the second box body with the concrete structure.
Optionally, the vacuum suction device further comprises a vacuum suction mechanism, wherein the vacuum suction mechanism comprises a first fan, the first fan is fixedly connected with the first box body and the second box body through a connecting rod, and the first fan is further connected with the sucker through an air suction pipeline.
Optionally, be equipped with first through-hole on the exhaust line, the periphery cover of exhaust line has the sleeve pipe, and the sleeve pipe is equipped with can be with first through-hole complex second through-hole, and the sleeve pipe is connected with the straight line driving piece of fixing at the exhaust line, and straight line driving piece can drive the sleeve pipe and follow the switching of exhaust line axis direction motion in order to realize first through-hole and second through-hole alignment and stagger state.
Optionally, the first box and the second box are provided with at least two pairs.
Optionally, an air bag is further installed in the first box body and the second box body, the air bag is connected with the second fan through an inflation pipeline, and the second fan is fixedly connected with the first box body and the second box body.
In a second aspect, an embodiment of the invention provides a concrete structure anti-permeability nondestructive testing device, which is used for detecting electric flux, and comprises an inner box and an outer box which are used in pairs and are arranged at the bottom in an open mode, wherein the inner box and the outer box are connected into a whole through a connecting piece, an anode plate is fixed inside the outer box, a cathode plate is arranged inside the inner box, sponges are arranged above the anode plate and the cathode plate, an air bag is arranged above the sponges, the outer box is connected with a platform, an electric flux detection element is arranged on the platform, a travelling mechanism is arranged at the bottom of the platform, and the travelling mechanism is connected with the platform through a telescopic part to realize the joint and separation states of the bottom surfaces of the inner box and the outer box and the concrete structure.
Optionally, sealing water stops are arranged on the bottom surfaces of the walls of the inner box and the outer box.
Optionally, the outer box is also connected with a fan, an air cover is arranged above an air outlet of the fan, the air cover is connected with one end of an air charging pipe through a rotating mechanism, and the other end of the air charging pipe is connected with the inner box and an air bag in the outer box.
Optionally, the slewing mechanism is including the rotating member of cover at the gas tube periphery, and rotating member is inside to be equipped with the shoulder hole, including the great first hole portion of diameter and the less second hole portion of diameter, and the second hole portion is fixed with the connecting pipe, is equipped with the rotation driving piece on the gas tube pipe wall, and the output shaft of rotation driving piece is connected with the first gear that is located first hole portion, and first gear meshes with the ring gear that sets up at first hole portion medial surface, and first gear still meshes with the second gear of rotating to be connected on the gas tube.
Optionally, the fan is still connected through the pipeline of bleeding with the sucking disc, the pipeline of bleeding is equipped with the third through-hole, and the periphery of pipeline of bleeding is equipped with the sleeve pipe, and the sleeve pipe is equipped with and is equipped with the fourth through-hole with third through-hole complex, and the sleeve pipe is connected with the fixed sharp driving piece on the extraction line, and sharp driving piece can drive the sleeve pipe and follow the pipeline axis direction motion of bleeding in order to realize that third through-hole and fourth through-hole align and stagger the switching of state.
The invention has the beneficial effects that:
1. the detection device is provided with the telescopic mechanism connected with the travelling mechanism, the travelling mechanism can travel along the surface of the concrete structure, the telescopic component is utilized to enable the bottom surfaces of the first box body, the second box body, the inner box body and the outer box body to be attached to the concrete structure, the bottoms of the first box body and the second box body can be opened by utilizing the opening and closing mechanism, so that anode solution and cathode solution permeate into the concrete structure, the inner box body and the outer box can utilize air bags to squeeze sponge, so that the anode solution and the cathode solution permeate into the concrete structure, after the anode plate and the cathode plate are electrified, the chloride ion permeability coefficient can be obtained by utilizing the electric conductivity detection element, the electric flux can be obtained by utilizing the electric flux detection element, the whole process is carried out on the concrete structure on a construction site, the indoor test is not needed, the damage to the concrete structure is avoided, and the subsequent repair procedure is also saved.
2. The detection device provided by the invention is provided with the fan and the sucker, so that the detection device can be effectively fixed on the horizontal plane or the vertical plane or the inclined plane of the concrete structure, and the long-time fixing reliable effect is realized, thereby meeting the time requirement of a test experiment.
3. According to the detection device, the air bags are arranged in the first box body and the second box body, the air bags can be gradually pressed to the internal solution after the second fan is used for inflating, so that the solution can cover the surface of a concrete structure more uniformly, the uniformity of permeation is ensured, the air bags are used for extruding the sponge in the outer box body and the inner box body to enable the solution to permeate out, the solution can be enabled to be in very fast contact with and always cover the surface of a structure, the uniformity of permeation can be ensured, the detection rate can be accelerated, the detection time is shortened, and high-efficiency detection is realized.
4. The device provided by the invention is provided with the travelling mechanism, so that the whole device has a moving function, and when the detection part is positioned at a higher position of the concrete structure, the device can reach the detection part quickly through the travelling mechanism without the help of manpower and other machines, thereby realizing the full automation of the device.
5. The detection device provided by the invention is provided with the linear driving part, so that the quick switching between the suction state and the release state of the suction disc can be realized, and the working efficiency and the automation degree are high.
6. The detection device provided by the invention is provided with the sealing water stop belt, so that the waste of solution leakage can be prevented after the water stop belt absorbs liquid and expands, the mixing pollution of two liquids can be prevented, and the accuracy of detection data is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not limit the application.
FIG. 1 is a schematic diagram of the whole structure of embodiment 1 of the present invention;
FIG. 2 is a schematic diagram showing the distribution of two pairs of first and second cases according to embodiment 1 of the present invention;
FIG. 3 is a schematic diagram showing the overall structure of embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of the whole structure of embodiment 1 of the present invention;
FIG. 5 is a cross-sectional view of a first case of embodiment 1 of the present invention;
FIG. 6 is a cross-sectional view of a second case of embodiment 1 of the present invention;
FIG. 7 is a schematic diagram showing the assembly of the suction pipe and the suction cup according to embodiment 1 of the present invention;
FIG. 8 is a schematic view of a walking mechanism according to embodiment 1 of the present invention;
FIG. 9 is a front view of the airbag of embodiment 1 of the present invention disposed in a second housing;
FIG. 10 is a top view of the airbag of embodiment 1 of the present invention disposed in a second housing;
FIG. 11 is a schematic diagram of a conventional chloride ion migration path of a chloride ion migration coefficient detecting device;
FIG. 12 is a plan view showing the chloride ion transport route according to example 1 of the present invention;
FIG. 13 is a front view showing the route of chloride ion transport according to example 1 of the present invention;
FIG. 14 is a top view showing the overall structure of embodiment 2 of the present invention;
FIG. 15 is a bottom view showing the overall structure of embodiment 2 of the present invention;
FIG. 16 is a side view showing the overall structure of embodiment 2 of the present invention;
FIG. 17 is a side view showing the overall structure of embodiment 2 of the present invention;
FIG. 18 is an isometric view of the overall structure of embodiment 2 of the invention;
FIG. 19 is a schematic view of a walking mechanism according to embodiment 2 of the present invention;
FIG. 20 is a schematic diagram illustrating the assembly of a third blower with a suction line and a suction cup according to embodiment 2 of the present invention;
FIG. 21 is a cross-sectional view of the inner and outer tanks of the airbag of embodiment 2 of the present invention in an uninflated state;
FIG. 22 is a sectional view of the inner case and the outer case in the inflated state of the airbag according to embodiment 2 of the present invention;
FIG. 23 is a top view of the air bags in the outer and inner tanks of example 2 of the present invention;
FIG. 24 is a front view of a rotary mechanism according to embodiment 2 of the present invention;
FIG. 25 is a side view of a rotary mechanism according to embodiment 2 of the present invention;
FIG. 26 is a bottom view of the inner and outer cases of embodiment 2 of the present invention;
the first box, 2, the second box, 3, the fixed plate, 4, the expansion plate, 5, the travelling mechanism mounting shell, 6.L type pipe, 7, the travelling motor, 8, the travelling motor power supply, 9, the bevel gear transmission mechanism, 10, the axle, 11, the travelling wheel, 12, the first fan, 13, the connecting rod, 14, the exhaust pipeline, 15, the sucker, 16, the sleeve, 17, the second through hole, 18, the anode solution injection port, 19, the anode power socket, 20, the anode plate, 21, the anode power wire, 22, the cathode solution injection port, 23, the cathode power socket, 24, the cathode plate, 25, the cathode power wire, 26, the cathode and anode power supply, 27, the control switch, 28, the conductivity meter socket, 29, the portable conductivity meter, 30, the anode electrode, 31, the cathode electrode, 32, the temperature sensor, 33, the second fan, 34, the charging pipeline, the air pump includes a fan switch, 36, an air bag, 37, sodium chloride solution, 38, deionized water, 39, sodium hydroxide solution, 40, an outer case, 41, an inner case, 42, a connector, 43, a platform, 44, 45, a walking motor, 46, a driving wheel shaft, 47, a walking wheel, 48, a driven wheel shaft, 49, a third fan, 50, a connecting plate, 51, a suction cup, 52, a fan bracket, 53, a housing, 54, a sleeve, 55, an air suction pipe, 56, a second linear motor, 57, an anode solution injection port, 58, an anode electrode injection port, 59, an anode plate, 60, a cathode solution injection port, 61, and a cathode electrode injection port, 62, a cable bus, 63, a power supply port, 64, an air bag, 65, a sponge, 66, a gas filling port, 67, an anode electrode injection port, 68, a cathode electrode injection port, a gas cover, 70, a rotating member, 71, a rotary driving motor, 72, 73. the first gear, 74, the sealing strip, 75, the cathode plate and 76, the wireless transmission module.
Detailed Description
Example 1
The embodiment provides a concrete structure permeation resistance nondestructive testing device, which is used for detecting the migration coefficient of chloride ions. As shown in fig. 1 to 4, the test device comprises a first box 1 and a second box 2 used in pairs, in this embodiment, in order to ensure the accuracy of the test result, a plurality of pairs of the first box 1 and the second box 2 are provided, preferably, two pairs of the first box 1 and the second box 2 are provided, as shown in fig. 2, wherein one pair is a first box A1 and a second box B1, and the other pair is a first box A2 and a second box B2.
The first box 1 and the second box 2 are vertically arranged, so that two first boxes 1 and two second boxes 2 are enclosed to form a square structure.
Be equipped with running gear installation shell 5 between adjacent first box 1 and the second box 2, first box 1 and second box 2 are connected into a whole through running gear installation shell 5, and running gear installation shell 5 is inside to be connected with running gear through telescopic part, and running gear can drive whole detection device to walk along concrete structure surface, and telescopic part's flexible motion can realize first box 1, the switching of second box 2 bottom surface and concrete structure surface laminating and separation state.
In order to enable the solution to permeate into the concrete structure in the first box body 1 and the second box body 2, the bottoms of the first box body 1 and the second box body 2 are all arranged in an open mode, and an open opening and closing mechanism is arranged at the open position and used for controlling the opening and closing of the bottom opening.
In this embodiment, the open opening and closing mechanism adopts a telescopic plate structure, and the telescopic plate structures of the first box 1 and the second box 2 are the same, and description is given by taking the telescopic plate structure in the first box 1 as an example:
as shown in fig. 5-6, the expansion plate structure comprises a fixing plate 3, the fixing plate 3 is provided with an expansion groove, an expansion element is arranged in the expansion groove, the expansion element adopts an electric expansion rod or a hydraulic expansion rod, the expansion element is fixed inside the expansion groove, the expansion part of the expansion element is connected with an expansion plate 4, the expansion plate 4 is slidably connected with the expansion groove, and the expansion plate 4 can do expansion motion relative to the fixing plate under the driving of the expansion element so as to realize the opening and closing of the bottom opening.
In this embodiment, since the width of the expansion plate 4 is equal to the width of the fixing plate, the expansion grooves are arranged along the same length of the fixing plate, and sealing strips are arranged on the two side edges of the expansion plate 4 and the front edge of the expansion direction for preventing water leakage, and sealing strips are also arranged on the groove surfaces of the expansion grooves for sealing the gap between the expansion plate and the expansion grooves.
The telescopic movement of the telescopic plate 4 is driven by the telescopic element, so that the opening or closing of the bottom opening of the first box body 1 can be realized.
The structure of the second casing 2 opening and closing mechanism is identical to that of the first casing opening and closing mechanism, and will not be described in detail here.
The telescopic part adopts electric hydraulic cylinder, electric hydraulic cylinder's cylinder body is fixed inside running gear installation shell 5, and electric hydraulic cylinder's piston rod is vertical to be set up, and electric hydraulic cylinder's piston rod is connected with the vertical pipeline section of L type pipe 6, and the horizontal pipeline section of L type pipe 6 stretches out to running gear installation shell 5 outsidely, be equipped with vertical spout on the running gear installation shell 5, the horizontal pipeline section stretches out to running gear installation shell 5 outside through vertical spout, allows L type pipe 6 to do vertical motion through the setting of vertical spout.
As shown in fig. 8, a traveling motor 7 is installed in the vertical pipe section, the traveling motor 7 is powered by a traveling motor power supply 8 positioned in the vertical pipe section, an output shaft of the traveling motor 7 is connected with an axle 10 through a bevel gear transmission mechanism 9, the axle 10 is supported by a bearing seat in the horizontal pipe section, and the axle 10 extends out of the horizontal pipe section and is connected with a traveling wheel 11.
The running gear can walk on concrete structure surface, and vertical concertina movement can be done to the piston rod of electronic pneumatic cylinder, and then drives first box 1 and second box 2 and do elevating movement, realizes that first box 1 and second box 2 bottom surface and concrete structure surface laminating and the switching of separation state.
The electric hydraulic cylinder is matched with a battery, so that the normal operation of the electric hydraulic cylinder is ensured.
The square structure formed by the two first boxes 1 and the two second boxes 2 is internally provided with a first fan 12, and the first fan 12 is fixedly connected with the two first boxes 1 and the two second boxes 2 through a connecting rod 13. The power supply and power supply circuit of the first fan 12 is arranged in the hollow connecting rod 13.
The one end that first fan 12 passed through four exhaust line 14 is connected, and the other end of exhaust line 14 is equipped with sucking disc 15, and is preferred, sucking disc 15 adopts the rubber suction disc, in this embodiment, the outside of first box 1 and second box 2 all is equipped with a sucking disc 15, first fan 12 can work, produce the negative pressure effect for whole detection device firm absorption is at concrete structure's surface, simultaneously first fan 12 can take out the air in sucking disc 15, make sucking disc 15 adsorb and fix at concrete structure surface, further strengthened whole detection device and concrete structure's fixed strength, make detection device effectually fix on concrete structure's horizontal plane or vertical face or inclined plane, long-time fixed reliable effect has been realized, thereby test experiment to the requirement of time has been satisfied.
As shown in fig. 7, the outer circumference of the exhaust pipeline 14 is sleeved with a sleeve 16, the exhaust pipeline 14 is provided with a first through hole, the sleeve 16 is provided with a second through hole 17 matched with the first through hole, the end of the sleeve 16 is connected with a linear driving piece fixed on the exhaust pipeline 14, the linear driving piece adopts a first linear motor 18, the first linear motor 18 can drive the sleeve 16 to move along the axial direction of the exhaust pipeline 14, when the first through hole and the second through hole 17 are aligned, external air can enter the suction cup to enable the suction cup to be separated from the surface of the concrete structure, when the first through hole and the second through hole 17 are staggered, the sleeve 16 can be tightly attached to the exhaust pipeline 14 to enable the first through hole to be closed, vacuum is formed in the suction cup 15 under the action of the first fan 12, and the suction cup is firmly adsorbed on the surface of the concrete structure.
An anode solution injection port 18 is arranged on the top tank wall of the first tank body 1 and is used for injecting anode solution into the first tank body 1, in this embodiment, the anode solution is deionized water, an anode power socket 19 is further arranged on the top tank wall of the first tank body 1, an anode plate 20 is fixed at the anode power socket 19 through a supporting rod, the anode plate 20 is located inside the first tank body 1, and the anode plate 20 is connected with one end of an anode power line 21.
The top tank wall of the second tank body 2 is provided with a cathode solution injection port 22 for injecting a cathode solution into the second tank body 2, the cathode solution in the embodiment is sodium chloride solution, the top tank wall of the second tank body 2 is also provided with a cathode power socket 23, a cathode plate 24 is fixed at the position of the cathode power socket 23 through a supporting rod, the cathode plate 24 is positioned in the second tank body 2, and the cathode plate 24 is connected with one end of a cathode power line 25.
Further, the anode solution injection port 18 and the cathode solution injection port 22 are respectively provided with a plugging cover in a matched manner.
The other ends of the anode power line 21 and the cathode power line 25 are connected with a cathode power supply 26 at the top of the travelling mechanism installation shell 5, and are controlled to be turned on and off by a control switch 27.
The first box 1 is provided with a conductivity meter socket 28, and is connected with a conductivity detection element through the conductivity meter socket 28, preferably, the conductivity detection element adopts a portable conductivity meter 29.
The anode electrode 30, the cathode electrode 31, and the temperature sensor 32 of the portable conductivity meter 29 are inserted into the first casing 1 through the conductivity meter insertion hole 28.
As shown in fig. 9-10, in this embodiment, the outer side surface of the top casing wall of the travelling mechanism mounting casing 5 is further provided with a second blower 33, the second blower 33 uses a small blower that carries a battery and is controlled to operate by a blower switch 35, the small blower is connected with an air bag 36 disposed inside the first casing 1 and the second casing 2 through an air charging pipeline 34, the area of the air bag in the first casing is smaller than the horizontal cross-sectional area of the space in the first casing, the area of the air bag in the second casing is smaller than the horizontal cross-sectional area of the space in the second casing, the edges of the air bags are connected through connecting wires, the small blower can charge the air bag, and preferably, the air bag adopts a rubber folding air bag.
In this embodiment, components such as walking motor, first fan, second fan, portable conductivity appearance, telescopic element, electronic pneumatic cylinder are all connected with control system, and control system passes through wireless transmission module and is connected with remote monitoring platform, can give remote monitoring platform with the information transmission who gathers, and the staff can send the instruction to control system through remote monitoring platform simultaneously.
In the conventional concrete chloride ion migration coefficient detection device, as shown in fig. 11, an electrode is inserted into a sodium hydroxide solution 39 above a concrete structure, and chloride ions in the sodium chloride solution 37 migrate under the action of current for a period of time in an acceleration manner, and finally reach the inside of a concrete test piece. The chloride ion migration path diagram in the device of this embodiment is shown in fig. 12-13, and the chloride ions of the sodium chloride solution in the second box body are accelerated to migrate under the action of the current for a period of time, the chloride ions reach the shallow surface layer of the concrete structure first, and then migrate into the first box body filled with deionized water 38, at this time, the conductivity of the deionized water changes, and when the slope of the conductivity-time curve tends to be constant, the corresponding parameters are substituted into the determined ion migration equation, so as to obtain the chloride ion migration coefficient. The device of the embodiment detects the chloride ion migration coefficient of the shallow surface layer of the concrete structure, and the depth is 20mm.
The specific working method of the detection device of the embodiment comprises the following steps:
detecting tightness of a bipolar liquid storage tank by a detection worker, then, 2L of 10% sodium chloride solution with percentage mass concentration is injected into a second tank body through a cathode solution injection port, 2L of deionized water is injected into a first tank body through an anode solution injection port, and plugging covers of the cathode solution injection port and the anode solution injection port are screwed; connecting plugs connected with the cathode power line and the anode power line into corresponding cathode power sockets and anode power sockets; the portable conductivity meter is connected to the conductivity meter socket 13.
The detection staff places the device of the embodiment on the surface of the concrete structure, presses the started first fan, and the first fan starts to work so that the device is fixed on the surface of the concrete structure; the wireless control module is used for adjusting the movement of the walking wheel in the mobile device, and the mobile device reaches the detection part after moving for a period of time.
The piston rod of the electric hydraulic cylinder is retracted through the wireless control module until the lower surfaces of the first box body and the second box body are completely attached to the surface of the concrete structure, and the suction disc is attached to the surface of the structure due to the pressure caused by the descending of the device in the embodiment, so that the suction disc 27 and the air in the air suction pipeline are extracted under the action of the first fan, and the suction disc is better adsorbed on the surface of the concrete structure. The fixing effect of the internal and external linkage fixing device is far greater than that of a single fixing device.
The telescopic parts of the telescopic elements are retracted through the wireless control module, the solution in the first box body and the solution in the second box body are oozed out to the surface of the concrete structure until the telescopic parts of the telescopic elements are retracted, the solution is completely contacted with the surface of the concrete structure, and the solution permeates into the concrete structure.
The wireless control module is used for starting the control switch, current is transmitted to the anode plate and the cathode plate through the electrode power line, and after the solution of the first box body and the solution of the second box body are conductive, voltage is formed between the anode plate and the cathode plate due to different cathode anode solutions, so that the solution is quickened to permeate into the structure.
The portable conductivity meter is started through the wireless control module and starts to work, the temperature of deionized water in the first box body is measured through the voltage and temperature sensor between the two electrodes of the portable conductivity meter and is transmitted to the automatic temperature compensator in the portable conductivity meter, the conductivity in the deionized water is calculated in the conductivity meter, and the electric conductivity is transmitted to the remote monitoring platform through the data transmission module.
When the detection time is 6h, liquid in the first box and the second box permeates into a part of the structure, liquid is uneven in the first box and the second box due to gravity, and for the uniformity of permeation, a small-sized blower switch is started through a remote control module, and the small-sized electric blower starts to work, so that wind enters the air bag through the air charging pipeline and is spread, the air bag is pressed to the liquid in the first box and the second box, and the liquid is uniformly spread on the surface of the concrete structure.
The remote monitoring platform can monitor the conductivity of the deionized water in the first box body, when the slope of the conductivity-time curve is constant, namely steady-state electromigration arrives, the concentration-time curve is obtained through temperature correction according to the relationship between the conductivity and the concentration, and the concentration-time curve is substituted into an equation to calculate the chloride ion migration coefficient.
Wherein the diffusion coefficient of chloride ions is obtained by an ion migration test;
K B is a constant;
t is absolute temperature;
Z i is the valence of the ions;
e o is the electronic quantity;
l is the electrode plate spacing;
a is the area of the migration surface;
v is the volume of the anode liquid storage tank;
u is the voltage between the electrodes;
c is the concentration of chloride ions in the cathode sodium chloride solution;
dc, dt is the initial and final concentration change rate of chloride ions.
After the detection is finished, the first linear motor drives the sleeve to move, so that the first through hole and the second through hole are aligned, at the moment, external air enters the sucker to break the pressure difference between the inside and the outside of the sucker, and the sucker is restored to a relaxed state; through the work of wireless control module control electronic pneumatic cylinder, walking wheel slowly descends, and first box and second box break away from concrete structure for this embodiment device conveniently removes, and nondestructive test has been realized to whole testing process, has avoided the damage to concrete structure and follow-up repair process, detects chloride ion migration coefficient and is concrete structure migration degree of depth 20mm, can effectively carry out maintenance prediction and durability evaluation.
In this embodiment, two sets of first box, second box and corresponding equipment are set up, judge the stability of the concrete chloride ion migration coefficient of detected position through the testing result, can avoid the influence of unstable factor to the detected data, make the data more reliable, have important practical meaning to further structure life prediction.
Example 2
The embodiment discloses a concrete structure anti-permeability nondestructive test device for concrete structure electric flux detection, as shown in fig. 14-18, including outer case 40 and inner case 41 that use in pairs, outer case 40 adopts the annular case, and inner case 41 is located the inside of annular space, and outer case 40 and inner case 41 coaxial setting, outer case 40 and the equal bottom open setting of inner case 41, and outer case 40 and inner case 41 bottom are connected into a whole through connecting piece 42.
In the present embodiment, for the accuracy of the measurement results, a plurality of sets of the outer case 40 and the inner case 41 used in pairs are provided, and preferably, two sets of the outer case 40 and the inner case 41 are provided.
The two outer boxes are integrally connected through a platform 43, and an electric flux detection element 44 is arranged on the platform 43.
The bottom surface of the platform 43 is connected with the travelling mechanism through a telescopic component, preferably, the telescopic component adopts an electric hydraulic cylinder, and a piston rod of the electric hydraulic cylinder is connected with the travelling mechanism.
As shown in fig. 19, the travelling mechanism comprises a travelling mechanism mounting shell, a power supply 44 is arranged in the travelling mechanism mounting shell and is used for supplying power to a travelling motor, the travelling motor 45 is connected with a driving wheel shaft 46 through gear transmission, the driving wheel shaft is rotationally connected to one end of the travelling mechanism mounting shell, travelling wheels 47 are mounted at two ends of the driving wheel shaft, a driven wheel shaft 48 is rotationally connected to the other end of the travelling mechanism mounting shell, and travelling wheels are mounted at two ends of the driven wheel shaft 48.
The electric hydraulic cylinder can drive the platform to lift, and then drive the outer box and the inner box to move, thereby realizing the switching of the laminating and separation state of the bottom surfaces of the outer box and the inner box and the surface of the concrete structure.
As shown in fig. 20, a third fan 49 is disposed on two sides of the outer box, the third fan 49 is fixedly connected with the outer box through a connecting plate 50, the third fan 49 is connected with a suction cup 51 through a suction pipeline, preferably, a third fan is connected with two suction pipelines and suction cups, in this embodiment, the suction cups are rubber suction cups.
The third fan power supply is arranged in the hollow connecting plate, the third fan power lines are all arranged in the fan bracket 52, and the fan bracket is fixed on the inner wall of the shell 53 of the third fan.
The third fan can extract the air in the sucking disc, and then makes the sucking disc adsorb and fix on concrete structure surface, be equipped with the third through-hole on the extraction line, extraction line 55 periphery cover has sleeve pipe 54, is equipped with on the sleeve pipe can with third through-hole complex fourth through-hole, the sleeve pipe is connected with the linear drive spare that fixes at the extraction line, linear drive spare adopts second linear motor 56, and the second linear motor can drive the sleeve pipe and follow extraction line's axis direction motion, and then realizes that third through-hole and fourth through-hole align and stagger the switching of state.
An anode solution injection port 57 and an anode electrode socket 58 are arranged on the top wall of the outer box, the anode solution injection port is used for injecting anode solution (deionized water), the anode electrode socket is connected with an anode plate 59 through a supporting rod and a screw, and the anode plate is connected with one end of an anode power line 67.
The top wall of the inner box is provided with a cathode solution injection port 60 and a cathode electrode socket 61, the cathode solution injection port is used for injecting a cathode solution (sodium chloride solution), the cathode electrode socket is connected with a cathode plate 75 through a support rod and a screw, and the cathode plate is connected with one end of a cathode power line 68.
The other ends of the anode power supply line and the cathode power supply line are connected to an electric flux detecting element by a cable bus 62 and a power outlet 63, which are all available with an existing electric flux detecting instrument, and the specific structure thereof is not described in detail herein.
As shown in fig. 21-23, the outer case and the inner case are respectively provided with an air bag 64, preferably, the air bags adopt expansion pressure air bags, a space below the expansion pressure air bags is provided with a sponge 65, the sponge in the outer case is placed above the anode plate, the sponge in the inner case is placed above the cathode plate, and the sponge fills the space between the air bags and the anode plate and the space between the air bags and the air bags in the inner case are filled with the sponge.
The outer box and the inner box are internally extruded with the sponge by the air bag to enable the solution to ooze, so that the solution can be contacted quickly and always cover the surface of a structure, the penetrating uniformity can be ensured, the detection rate can be accelerated, the detection time is shortened, and the high-efficiency detection is realized.
The gasbag in the outer container is connected with a gas hood 69 above the third fan on one side of the outer container through an inflation pipeline 66, a rotating mechanism and a connecting pipe, the gas hood is connected with the rotating mechanism through the connecting pipe, the connecting pipe is an L-shaped pipe, and the gas hood is of a conical hood body structure.
The air bag in the inner box is connected with the air hood above the third fan on the other side of the outer box through an air charging pipeline and a rotating mechanism, the air hood is connected with the rotating mechanism through a connecting pipe, and the air hood is of a conical hood body structure.
The rotating mechanism can drive the connecting pipe to rotate, so that the gas hood is driven to rotate, and further the switching of the state that the wide opening of the gas hood faces the third fan and deviates from the third fan is realized.
As shown in fig. 24-25, the rotating mechanism includes a rotating member 70 sleeved on the outer periphery of the air charging tube, a stepped hole is formed in the rotating member, the stepped hole includes a first hole portion with a larger diameter and a second hole portion with a smaller diameter, the second hole portion is fixed with the connecting tube, a rotation driving member is arranged on the tube wall of the air charging tube, the rotation driving member adopts a rotation driving motor 71, an output shaft 72 of the rotation driving member is connected with a first gear 73 located in the first hole portion, the first gear is meshed with a gear ring arranged on the inner side surface of the first hole portion, the first gear is further meshed with a second gear rotationally connected to the air charging tube, the rotating member is axially positioned by using friction force of the first gear and the second gear, and in other embodiments, the second gear is further provided with a limiting table embedded into a limiting groove formed by the stepped surface formed by the first hole portion and the second hole portion to axially limit the rotating member.
As shown in fig. 26, the bottom surfaces of the outer case and the inner case are further provided with water stop sealing belts 74, so that when the water stop belts absorb liquid and expand, the waste of solution leakage can be prevented, the mixing and pollution of the two liquids can be prevented, and the accuracy of detection data is ensured.
In this embodiment, the walking motor, the second linear motor, the rotation driving motor, the electric hydraulic cylinder, the electric flux detecting element and other components are all connected with a control system, and the control system is connected with a remote monitoring platform through a wireless transmission module 76.
The working method of the detection device of the embodiment comprises the following steps:
the outer box and the inner box are respectively filled with sponge through the bottoms of the outer box and the inner box, and the anode plate and the cathode plate are fastened at the bottom of the supporting rod through the filter. And injecting the detection solution into the sponge through the anode solution injection port and the cathode solution injection port respectively until liquid seeps out from the bottom of the sponge.
The total power line 6 is inserted into a power line jack in the electric flux detecting instrument, the anode electrode line is inserted into an anode electrode jack of the outer box, and the cathode power line 8 is inserted into a cathode electrode jack at the upper part of the inner box.
The detection personnel hand-hold the device of this embodiment on concrete structure surface, start the power of third fan, third fan begins work, and this embodiment device is fixed in concrete structure thing surface, and detection personnel side can loose hand.
The travelling mechanism is started, the travelling mechanism walks to the detection part, and the travelling mechanism wheel can slowly rise by controlling the electric hydraulic cylinder in the travelling mechanism until the bottoms of the outer box and the inner box are contacted and attached to the surface of the concrete structure.
A second linear motor at the upper part of an exhaust pipe in the fixing device is started through the wireless remote control module, so that the third through hole and the fourth through hole are staggered, the sucker is adjusted to be in an adsorption state, and the whole device is firmly fixed on the surface of a concrete structure; the driving motor is rotated to enable the wide mouth of the air hood to face downwards, air discharged by the third fan is blown into the air charging pipeline to enter the internal expansion pressure air bag, liquid in the sponge 30 is extruded, the sealing water stop can absorb a small part of liquid, the volume of the sealing water stop expands, and the sealing water stop is tightly attached to the surface of the concrete structure, so that the effects of sealing water stop and dividing a permeable area are achieved.
And starting the electric flux detector element through the wireless remote control module, applying 60V direct current voltage to the two electrodes through the main power line 6, recording the current value passing through the surface concrete in real time, and obtaining the value of the electric flux passing through the surface concrete by the controller according to the current value passing through 6h after the current is applied for 6 h. The formula of the internal calculated electric flux is as follows:
Q＝900(I 0 +2I 30 +2I 60 +...+2I t +...+2I 300 +2I 330 +2I 360 )
wherein: q-the electric flux (C) passing through;
I 0 -initial current (a), accurate to 0.001A;
I t -current (a) at time t (min) to the nearest 0.001A.
The concrete detected by the device of the invention is in the range of the area of the connecting piece 1-3 of the inner and outer chambers, and the depth is about 20mm.
7) The data transmission that the electric flux detecting element detected, wireless transmission module will electric flux detecting element 20 detected data transmission give remote monitoring platform, and the staff can carry out data processing at remote monitoring platform.
8) After the data are measured, the wireless transmission module is operated to start the rotation driving motor, the wide opening of the air cover 12 faces upwards, at the moment, the air exhausted by the fan cannot enter the wireless transmission module, and the sponge rebounds to extrude the air in the expansion pressure air bag 27 to the outside, so that the air dispersing effect is achieved; and then the second linear motor on the extraction pipeline is started to align the third through hole with the fourth through hole, air is poured into the sucker 17, and the pressure difference between the inside and the outside of the sucker 17 is broken, so that the suction pipeline is in a relaxed state.
9) The electric hydraulic cylinder is controlled by the wireless transmission module to realize the descent of the travelling mechanism, so that the bottoms of the outer box and the inner box are separated from the surface of the structure; the running mechanism is started, the device returns to the original path, and the detection is completed.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (4)
1. The nondestructive testing device for the permeability resistance of the concrete structure is used for detecting the chloride ion migration coefficient and is characterized by comprising a first box body and a second box body which are used in pairs, wherein the bottoms of the first box body and the second box body are provided with an opening and closing mechanism, an anode plate is fixed in the first box body and is provided with a conductivity detection element, a cathode plate is fixed in the second box body, and the first box body and the second box body are connected with a travelling mechanism through telescopic parts so as to realize the joint and separation state switching of the bottom surfaces of the first box body and the second box body and the concrete structure;
still include negative pressure adsorption equipment, negative pressure adsorption equipment includes first fan, and first fan passes through connecting rod and first box and second box fixed connection, and first fan still is connected with the sucking disc through the pipeline of bleeding.
2. The nondestructive testing device for the permeability resistance of a concrete structure according to claim 1, wherein the pumping pipe is provided with a first through hole, a sleeve is sleeved on the periphery of the pumping pipe, the sleeve is provided with a second through hole which can be matched with the first through hole, the sleeve is connected with a linear driving piece fixed on the pumping pipe, and the linear driving piece can drive the sleeve to move along the axial direction of the pumping pipe so as to realize the alignment and staggering switching of the first through hole and the second through hole.
3. A concrete structure permeation resistance nondestructive testing device according to claim 1, wherein said first and second tanks are provided in at least two pairs.
4. The nondestructive testing device for the permeability resistance of a concrete structure according to claim 1, wherein air bags are further installed in the first box body and the second box body, the air bags are connected with a second fan through an air charging pipeline, and the second fan is fixedly connected with the first box body and the second box body.
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