CN115852863A - Bridge crack detector with constraint function and detection method - Google Patents
Bridge crack detector with constraint function and detection method Download PDFInfo
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- CN115852863A CN115852863A CN202211625489.2A CN202211625489A CN115852863A CN 115852863 A CN115852863 A CN 115852863A CN 202211625489 A CN202211625489 A CN 202211625489A CN 115852863 A CN115852863 A CN 115852863A
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Abstract
The invention relates to a bridge crack detector with a constraint function and a detection method, which effectively solve the problem of poor effect caused by single means and functions in the conventional bridge detection; the technical scheme comprises the following steps: according to the scheme, the steel cables are arranged along the two sides of the crack and are matched with the detection barrel and the amplification barrel, so that the overall development situation of the crack can be comprehensively obtained without excessive detection equipment, and when the crack is expanded to a certain degree, certain constraint force (too fast expansion of the crack is limited) can be automatically applied to the crack, and the effect of delaying the expansion speed of the crack as much as possible is achieved.
Description
Technical Field
The invention relates to the technical field of bridge maintenance, in particular to a bridge crack detector with a constraint function and a detection method.
Background
When the width of the crack reaches a certain degree, external water vapor easily enters the temporal part and accelerates the corrosion of the reinforcing steel bars, so that the integrity of the bridge is directly damaged, and the bearing capacity of the bridge is greatly reduced;
the method comprises the following steps that when a bridge crack is generated, the crack needs to be detected to ensure the development state of the crack, the conventional main mode is that the crack is manually and periodically inspected, a crack meter is adopted to further obtain the development condition of the crack, the manual periodic inspection efficiency is low, a large amount of manpower and material resources are consumed, the crack meter is adopted to detect (the crack meter stretches across the crack and is fixed at a certain position of the crack, and then the real-time detection of the crack is realized), although the manual inspection is omitted, the crack can only be detected at a certain position of the same crack, and the detection cannot be carried out on other regions of the crack (if a large number of crack meters are adopted, the effect can be realized, but the cost expenditure is greatly increased), so that the overall development situation of the crack cannot be obtained;
at present, the method adopted for the crack occurrence is single, in the whole detection period process, the expansion condition of the crack is only obtained through a detector, the generated crack part cannot be restrained to a certain degree (the crack development is restrained), the detection period process of the crack and the restraint of the crack cannot be organically combined, and the service life of the bridge is further prolonged;
in view of the above, we provide a bridge crack detector with a constraint function and a detection method thereof to solve the above problems.
Disclosure of Invention
According to the bridge crack detector with the constraint function and the detection method, the steel cables are arranged along the two sides of the crack and are matched with the detection cylinder and the amplification cylinder, so that the overall development situation of the crack can be comprehensively obtained without excessive detection equipment, and when the crack is expanded to a certain degree, a certain constraint force can be automatically applied to the crack (so as to limit the too fast expansion of the crack) to achieve the effect of delaying the expansion speed of the crack as much as possible.
A bridge crack detector with a constraint function and a detection method are characterized by comprising a plurality of expansion anchor rods which are arranged at two sides of a crack at intervals in a staggered mode, a steel cable is wound among the expansion anchor rods, one end of the steel cable is fixedly connected with the expansion anchor rod positioned at one end and sequentially wound around the subsequent expansion anchor rod, and the other end of the steel cable is fixedly connected with the expansion anchor rod positioned at the other end;
a gap is arranged on the steel cable between the two expansion anchor rods, one end of the gap is connected with a detection cylinder, a detection piston elastically connected with the detection cylinder is arranged in the detection cylinder, the detection piston outwards extends out of one end of the detection cylinder and is connected with the other end of the gap, one end of the detection cylinder is communicated with an amplification cylinder through a control pipeline, an amplification piston elastically connected with the amplification cylinder is arranged in the amplification cylinder, and one end of the amplification piston outwards extending out of the amplification cylinder is connected with a telescopic measuring instrument;
the control pipeline is internally provided with a conduction valve, the conduction valve is electrically connected with a microcontroller, and the detection cylinder and the amplification cylinder are filled with hydraulic oil.
The beneficial effects of the technical scheme are as follows:
(1) According to the scheme, the steel cables are arranged along the two sides of the crack and are matched with the detection cylinder and the amplification cylinder, so that the overall development situation of the crack can be comprehensively obtained without excessive detection equipment, and when the crack is expanded to a certain degree, a certain constraint force can be automatically applied to the crack (so as to limit the excessive rapid propagation of the crack) to achieve the effect of delaying the expansion speed of the crack as much as possible;
(2) In the scheme, the automatic detection of the development situation of the crack can be realized by automatically applying a certain constraint force to the crack and withdrawing the constraint again after the certain duration so as to realize the execution process of continuously detecting the development situation of the crack, the detection is completely carried out based on the development situation of the crack (the development situation of the crack directly determines the progress of the process) without the help of an external control system for control, so that the dependence of the detector on external environmental factors (conditions) is reduced, and the independent working performance of the detector is further enhanced.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic front view of a cable and crack installation relationship in accordance with the present invention;
FIG. 3 is a schematic view showing the relationship between the detecting cylinder, the amplifying cylinder and the driving cylinder;
FIG. 4 is a schematic view of the internal structure of the detection cylinder, the amplification cylinder and the driving cylinder after cross-section;
FIG. 5 is a schematic view of the through hole of the present invention communicating with one of the connecting pipes;
FIG. 6 is a schematic view of the through hole of the present invention in communication with another set of connecting pipes;
FIG. 7 is a schematic view of an internal structure of a conduit according to the present invention;
FIG. 8 is a schematic view showing a process of changing the positional relationship of the pressure plates according to the present invention;
FIG. 9 is a schematic diagram showing the relationship between the travel amplifier, the guide wheel and the conductive rod.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which reference is made to the accompanying drawings.
Embodiment 1, this embodiment provides a bridge crack detector with a constraint function and a detection method, and the improvement of this scheme lies in: as shown in figure 1, the position both sides that produce the crack at the bridge anchor intrinsic inflation stock 1 respectively, a plurality of inflation stocks 1 crisscross distribution is in cracked both sides, around being equipped with cable wire 2 on a plurality of inflation stocks 1, as shown in figure 2, 2 two of cable wire respectively with the inflation stock 1 (i.e. Q) that is in two positions, I two inflation stocks 1) fixed connection, cable wire 2 walks around the inflation stock 1 (E) that is in the middle part, F, G, four inflation stocks 1 of H, can be equipped with the recess with 2 adaptations of cable wire on the inflation stock 1 that is in the middle part, be located cable wire 2 in the recess in order to realize spacing to cable wire 2, avoid it to produce the displacement for inflation stock 1), annotate: the steel cable 2 after the installation is ensured to be in a tense state, in the scheme, 6 expansion anchor rods 1 are arranged as an example, and in the practical application process, a corresponding number of expansion anchor rods 1 can be arranged according to the length of a crack;
as shown in fig. 2, a gap is formed in the steel cable 2 between the two expansion anchor rods 1Q and E, and one end of the gap is fixedly connected with a detection cylinder 4, as shown in fig. 4, a detection piston 5 is arranged in the detection cylinder 4 and is connected with a spring between the detection cylinder 4, one end of the detection piston 5 extending outwards from the detection cylinder 4 is fixedly connected with the other end of the gap, so that the steel cable 2 at two ends of the gap can be connected through the detection cylinder 4 and the detection piston 5 which are matched, one end of the detection cylinder 4 is communicated with an amplification cylinder 6 through a control pipeline, an amplification piston 7 is arranged in the amplification cylinder 6 (the spring is connected between the amplification piston 7 and the amplification cylinder 6), and one end of the amplification piston 7 extending outwards from the amplification cylinder 6 is connected with a telescopic measuring instrument (used for measuring the expansion degree of cracks);
a limiting ring 3 matched with the detection piston 5 is arranged in the detection cylinder 4 (so as to limit the moving distance of the detection piston 5 in the detection cylinder 4), namely, when the detection piston 5 moves to be in contact with the limiting ring 3, the detection piston cannot move continuously at the moment, and further cannot continuously detect the expansion degree of the crack, and in an initial state, the distance between the detection piston 5 and the limiting ring 3 can be determined according to the expansion condition (width) when the crack is found and the maximum degree (under the premise of ensuring the safety of a bridge) of the crack which can be finally expanded, and hydraulic oil 27 is respectively filled in the spaces where the detection cylinder 4 and the amplification cylinder 6 are communicated with the connecting pipeline 11 (the spaces where the other ends of the detection cylinder 4 and the amplification cylinder 6 are communicated with the connecting pipeline 11 are respectively communicated with the outside);
as shown in fig. 2, when the worker installs the above-mentioned structural components in place and finishes the debugging, real-time detection of the crack development can be started, and when the crack develops at a certain position, it will inevitably cause the corresponding expansion anchor rod 1 to displace outwards (i.e. move in a direction away from the crack), and along with the outward movement, a pulling force extending outwards on the steel cable 2 will be applied, as shown in fig. 4, because one end of the steel cable 2 at the gap position is connected with the detection piston 5, and the other end is connected with the detection cylinder 4, and further along with the application of the pulling force, the detection piston 5 will be simultaneously driven to move relative to the detection cylinder 4 (so that the spring between the connection and the detection piston 5, the detection cylinder 4 is stretched), and along with the movement of the detection piston 5, the hydraulic oil 27 originally in the detection cylinder 4 is squeezed into the amplification cylinder 6 through the connection pipeline 11, so as to force the amplification piston 7 to move in the amplification cylinder 6, note: when the crack propagation device is arranged, the inner diameter of the detection cylinder 4 is larger than the inner diameter of the amplification cylinder 6 (can be N times of the inner diameter), so that when a crack expands at a certain position and drives the detection piston 5 to move in the detection cylinder 4 for a distance H, the movement distance of the amplification piston 7 in the amplification cylinder 6 is N H under the action of the hydraulic oil 27, the expansion displacement amount of the crack is very small, the movement distance of the detection piston 5 in the detection cylinder 4 is also very small under the action force exerted on the detection piston 5 and the detection cylinder 4 by the steel cable 2 when the crack expands outwards, the expansion distance of the crack can be amplified through the matching between the detection cylinder 4 and the amplification cylinder 6, the amplified displacement is on the movement distance of the amplification piston 7, and the expansion degree of the crack can be measured and evaluated due to the fact that the amplification piston 7 is connected with a telescopic measuring instrument, and the expansion condition of the crack can be obtained;
as shown in fig. 2, no matter at any position on the crack, as long as the position generates outward expansion, the expansion anchor rod 1 at the corresponding position (or at a position close to the corresponding position) can be forced to move outward, so as to achieve the effect of pulling the steel cable 2, and along with the steel cable 2 receiving outward pulling force, the detection piston 5 is forced to displace relative to the detection cylinder 4, and finally the expansion degree of the crack is measured by the telescopic measuring instrument, so as to achieve real-time detection of the whole situation of the crack, and further obtain a relatively comprehensive data;
note: the inside conduction valve that is equipped with of control pipeline and conduction valve electric connection has microcontroller, staff's accessible microcontroller control conduction valve open or close, and then realize the switching on or not switching on of control pipeline, when control pipeline switches on (detect the section of thick bamboo 4 this moment, the amplifier section of thick bamboo 6 is in the connected state), as long as there is the action of expanding outward in some position department of crack, will force detection piston 5, detect section of thick bamboo 4 and produce relative displacement and then squeeze its inside hydraulic oil 27 to the amplifier section of thick bamboo 6 through the control pipeline (thereby obtain the expansion condition of crack through flexible measuring apparatu), after the continuous real-time detection of crack, through the detection data of this period, if find the expansion situation of crack is comparatively serious, then need take certain measure to bridge crack production position this moment, namely, exert certain confining force in order to play the suppression or slow down the expansion rate of crack (as shown in figure 2, under the cooperation of a plurality of expansion anchor 1 and cable wire rope 2, form a plurality of triangle-shaped areas respectively in the both sides position of crack, if A, B, C, D area is and each area is triangle-shaped and is arranged because each area has triangle-shaped, the stability of triangle-shaped, therefore can realize the stability of crack and carry out more the life of the specific restraint effect of crack, thereby more the life of crack is obtained: the working personnel controls the conduction valve to close through the microcontroller, so that the connecting pipeline 11 is in a non-conduction state (at the moment, the detection cylinder 4 and the amplification cylinder 6 are not communicated), in a subsequent time period, if the crack has a tendency of continuously expanding outwards, the corresponding expansion anchor rod 1 is forced to move outwards, so that the steel cable 2 is pulled, along with the pulling of the steel cable 2, the steel cable 2 which is positioned at one end of the gap and connected with the detection piston 5 exerts a pulling force on the detection piston 5, the steel cable 2 which is positioned at the other end of the gap and connected with the detection cylinder 4 exerts a pulling force on the detection cylinder 4, the two pulling forces are opposite in direction, the detection cylinder 4 and the detection piston 5 have a tendency of relative movement, but because the connecting pipeline 11 is in the non-conduction state at the moment, hydraulic oil 27 stored in the connecting pipeline cannot flow, further, relative movement between the detection cylinder 4 and the detection piston 5 cannot be generated, so that a certain constraint effect on the crack is achieved (along with the aggravation of the crack expansion situation, the pressure of hydraulic oil 27 stored in the detection cylinder 4 and the amplification cylinder 6 is gradually increased), after constraint is applied for a certain time (the constraint force cannot be always applied, because the pressure in the detection cylinder 4 is increased to be very large along with the continuous expansion of the crack, and if the constraint force is not removed, damage is easily caused due to the overlarge pressure), a worker can control the conduction valve to be opened again through the microcontroller to enable the connection pipeline 11 to be conducted again, at the moment, the hydraulic oil 27 in the detection cylinder 4 can enter the amplification cylinder 6 through the connection pipeline 11, and continuous real-time detection on the crack expansion situation is achieved;
the process can be carried out in a reciprocating mode, namely, after the expansion condition of the crack is detected for a period of time, the controllable conduction valve is closed, and constraint force of the crack for a period of time is applied to the crack, so that the expansion speed of the crack is reduced, the process is carried out in a circulating mode, the real-time detection of the expansion condition of the crack is realized, and the development speed of the crack can be reduced and inhibited.
when the crack is expanded outwards, the detection piston 5 is forced to move relative to the detection cylinder 4, the amplification piston 7 is forced to move through the flow of the hydraulic oil 27, the conductive head 8 is driven to move relative to the resistance plate 9, the resistance value of the resistance plate 9 connected in series into the voltage stabilizing loop is changed, the change condition of the current in the voltage stabilizing loop is measured by the sensitive ammeter, the sensitive ammeter is electrically connected with the microcontroller (the microcontroller can obtain the change condition and the numerical value of the current in the voltage stabilizing loop in real time), the microcontroller calculates the displacement of the conductive head 8 relative to the resistance plate 9 (the resistance value of the resistance plate 9 in unit length is fixed) according to the change condition of the current, the displacement of the conductive head 8 relative to the resistance plate 9 is the distance of the elongation of the steel cable 2, and a worker predicts and judges the expansion condition of the crack according to the stretched distance of the steel cable 2, so that the development condition of the crack is known;
as shown in fig. 3, a protective shell 30 is arranged on the outer wall of the detection cylinder 4, as shown in fig. 4, the conductive heads 8 of the resistance plate 9 are all arranged in the protective shell 30, and the protective shell 30 can prevent interference factors in the external environment from influencing the normal operation and running of the voltage stabilizing loop (can isolate other impurities such as rainwater).
the conduction pipe 12 is connected with a driving mechanism, and the driving mechanism satisfies: the conducting tube 12 is synchronously driven to axially move along the adjusting tube 10 (as shown by the arrow in fig. 5) along with the crack propagation, so that when the through hole 13m is no longer communicated with the connecting pipeline 11b, the through hole 13n just moves to the position corresponding to the connecting pipeline 11a along with the conducting tube 12, as shown in fig. 6, because a pressure valve is arranged in the through hole 13n and the connecting pipeline 11b is in a non-conducting state, at this time, the detecting cylinder 4 and the amplifying cylinder 6 are not conducted, and the hydraulic oil 27 cannot flow, a certain degree of constraint force is exerted on the crack, the magnitude of the constraint force synchronously increases along with the increase of the stress for driving the crack propagation inside the bridge, when the constraint force is large to a certain degree (namely, just reaching the opening condition of the pressure valve), the pressure valve in the through hole 13n is opened and the through hole 13n and the corresponding connecting pipeline 11a are communicated (as shown in fig. 6), and the hydraulic oil 27 can enter the amplifying cylinder 6 through the connecting pipeline 11a and the through hole 13n, so as to further recover the crack.
this embodiment is at the time of concrete work: as shown in fig. 5, initially, the through hole 13m and the connecting pipeline 11b on the conducting pipe 12 are in a conducting state (the position of the through hole 13m and the position of the connecting pipeline 11b are set to be in a maximum corresponding state at this time), at this time, the hydraulic oil 27 can make the through hole 13m and the connecting pipeline 11b flow, the hydraulic oil 27 in the detecting cylinder 4 flows into the amplifying cylinder 6 and then forces the amplifying piston 7 to move, so that the hydraulic oil 27 originally in the amplifying cylinder 6 is squeezed into the driving cylinder 14 and then forces the driving piston 15 to move, and the conducting pipe 12 is driven to move in the direction shown by the arrow in fig. 5 in the adjusting pipe 10 along with the movement of the driving piston 15, and the hydraulic oil 27 in the control cylinder is gradually squeezed into the amplifying cylinder 6 along with the development of the crack expansion situation, and then the hydraulic oil 27 originally stored in the amplifying cylinder 6 is squeezed into the driving cylinder 14, finally, the driving piston 15 drives the conducting pipe 12 to move axially relative to the adjusting pipe 10, so that the degree of correspondence between the through hole 13m and the corresponding connecting pipeline 11b is gradually reduced, so that when the through hole 13m and the corresponding connecting pipeline 11b are not conducted any more (as long as the through hole 13m and the connecting pipeline 11b are still in a conducting state, the hydraulic oil 27 can still flow between the detection cylinder 4 and the amplification cylinder 6, and then a crack can be detected in real time), the through hole 13n arranged on the conducting pipe 12 just moves to a position corresponding to the connecting pipeline 11a, at this time, the detection cylinder 4 and the amplification cylinder 6 are not conducted any more (if the crack continues to expand outwards in the subsequent process, the pressure of the hydraulic oil 27 in the detection cylinder 4 is gradually increased), and the pressure valve arranged in the through hole 13n is in a closed state, at this time, the hydraulic oil 27 cannot flow into the amplifying cylinder 6 from the detecting cylinder 4, so a certain degree of constraint force is applied to the crack from this moment on (the magnitude of the constraint force is synchronously increased along with the increase of the stress for driving the crack to expand inside the bridge), until the pressure of the hydraulic oil 27 in the detecting cylinder 4 reaches the condition for driving the pressure valve to open, at this time, the through hole 13n is communicated with the connecting pipeline 11a, the hydraulic oil 27 can flow (at this time, the constraint force applied to the crack is removed), and the real-time detection of the crack is continued to be resumed (because the scheme is provided with two through holes 13 on the conducting pipe 12, when the through hole 13n moves along with the conducting pipe 12 and is no longer communicated with the connecting pipeline 11a, at this time, a worker needs to remove the detector on site and maintain and repair the crack);
in the embodiment, the steel cable 2 is skillfully expanded by means of crack and is subjected to pulling force, the conduction pipe 12 is synchronously driven to move relative to the adjusting pipe 10 through the matching among the detection cylinder 4 (the detection piston 5), the amplification cylinder 6 (the amplification piston 7) and the driving cylinder 14 (the driving piston 15), so that a certain degree of constraint force is automatically applied to the surrounding part of the crack of the bridge after the crack is detected in real time for a certain time (so as to slow down the expansion situation of the crack), and after the constraint force is applied for a certain time (when the pressure of hydraulic oil 27 in the detection cylinder 4 meets the opening condition of the pressure valve, the constraint force is removed), the real-time detection of the crack can be automatically recovered, so that the process can be completed without an external additional control unit, the dependence of the detector on the external environment and conditions (if the action process is completed by the external control unit, a plurality of electric control components are needed, the power consumption of the detector is increased, and how much sufficient power supply is provided for the detector in the harsh environment, so that the detector is suitable for the field environment and the supporting cost of the bridge can be greatly reduced;
as shown in fig. 7, through grooves 31 communicating with the through holes 13m may be respectively provided on the outer walls of both axial sides of the conduction pipe 12, when the through grooves are provided, the inner diameter of the driving cylinder 14 and the inner diameter of the detection cylinder 4 are kept the same, the movement distance of the detection piston 5 in the detection cylinder 4 and the movement distance of the driving piston 15 in the driving cylinder 14 are kept synchronous, and since the expansion amount of the width of the crack in the outward expansion process is larger than the inner diameter of the through hole 13, the through grooves 31 communicating with the through holes 13m are respectively provided on both axial sides of the conduction pipe 12, so as to satisfy the following requirements: when the crack is detected in real time for a long time, a certain constraint force is applied to the crack, the length of the through groove 31 determines when the detector applies the certain constraint force to the crack, and if the through groove 31 is not arranged, the certain constraint force is applied to the crack when the moving distance of the detection piston 5 in the detection cylinder 4 is the same as the inner diameter of the through hole 13, so that the length of the through groove 31 is required to be correspondingly arranged according to the frequency of applying the constraint force to the crack in the actual application process;
in addition, in the present embodiment, only two sets of through holes 13 are provided on the conducting pipe 12, if it is desired to realize that the cracks are restrained more times, more sets of through holes 13 can be provided on the conducting pipe 12 (a corresponding number of connecting pipelines 11 are provided between the detecting cylinder 4 and the amplifying cylinder 6, and a pressure valve is provided in each of the remaining through holes 13 except the first through hole 13), and the distance between the through holes 13 needs to satisfy: when one through hole 13 is not communicated with the corresponding connecting pipeline 11 along with the movement of the conduction pipe 12, the other through hole 13 which is adjacent to the conduction pipe is just in relative position with the corresponding connecting pipeline 11 along with the movement of the conduction pipe 12 (when the pressure in the cylinder 4 to be detected reaches the pressure valve opening condition, the real-time detection of the crack is resumed, and a stage of applying a restraining force to the crack before the pressure does not reach the pressure valve opening condition).
when the conduction pipe 12 moves from the position shown in fig. 5 to the position shown in fig. 6, a certain degree of restraining force is applied to the crack, as shown in the left side view of fig. 8, and the left side of the through hole 13n is subjected to the pressure of the hydraulic oil 27 from the detection cylinder 4, and the pressure gradually increases with the increase of the stress causing the crack to expand outward, and when the pressure increases to meet the opening condition of the pressure detector arranged in the pressure plate 16, the unlocking mechanism is controlled to unlock the pressure plate 16, and then the pressure plate 16 moves up rapidly under the action of the spring connected thereto and until the pressure plate exits from the through hole 13n, that is, the situation is changed to the right side view shown in fig. 8, at which the through hole 13n is in a conduction state and the hydraulic oil 27 can flow into the amplification cylinder 6 through the detection cylinder 4 (real-time detection of the crack is achieved).
along with the increase of the pressure of the hydraulic oil 27 in the detection cylinder 4, the pressure applied to the rubber pad 18 gradually increases and compresses the spring connected with the rubber pad (the spring can be a spring with a larger elastic coefficient), so that the rubber pad 18 is concave, along with the concave of the rubber pad 18, the hydraulic oil 27 in the pressure measuring cavity 17 is forced to be extruded into the unlocking cylinder 19 through a pipeline and the unlocking piston 20 is forced to move downwards in the unlocking cylinder 19, and the embodiment provides a specific structure of an unlocking mechanism and a positioning mechanism, and the specific structure comprises the following components:
a positioning rod 26 is slidably mounted in the conduction tube 12 (a spring is connected between the positioning rod 26 and the conduction tube 12, the spring connected with the positioning rod 26 is not shown in the figure, the positioning rod 26 is mounted according to the layout in the conduction tube 12), a positioning hole 25 corresponding to the positioning rod 26 is arranged on the pressure plate 16, an unlocking inclined plate 24 is integrally arranged at one end of the unlocking piston 20, which extends out of the unlocking cylinder 19, an unlocking inclined block 23 is arranged at the other end of the positioning rod 26 (so that the positioning rod 26 is arranged in an L shape), the positioning rod 26 is synchronously forced to move towards the direction of withdrawing from the positioning hole 25 through the cooperation of the unlocking inclined plate 24 and the unlocking inclined block 23 along with the downward movement of the unlocking piston 20, so that the pressure of hydraulic oil 27 in the detection cylinder 4 is enough to force the rubber pad 18 to indent to a certain degree, and finally the unlocking piston 20 is driven to move downwards by the hydraulic oil 27 for a certain distance, so that the positioning rod 26 is completely withdrawn from the positioning hole 25, the positioning plate is rapidly moved upwards and withdrawn from the through hole 13n (as shown in a right side view in fig. 8) under the action of the spring connected with the detection cylinder 4 and the amplification cylinder 6, and the crack is in a real-time recovery process.
when the position of the crack has a tendency of flaring, the anchor rod 1 and the guide wheel 21 are expanded to force the steel cable 2 to manually pull, as shown in fig. 2, if flaring is generated at or near the position E, the guide wheels 21F, G and H do not rotate, and the steel cable 2 at the position and the guide wheel 21 corresponding to the position do not generate relative displacement, but the guide wheel 21E and the steel cable 2 corresponding to the guide wheel 21 generate relative displacement and the guide wheel 21E rotates relative to the anchor rod;
if the position of F or the position near the F is expanded, the guide wheels 21G and H do not rotate, and the steel cable 2 at the position and the corresponding guide wheel 21 do not generate relative displacement, but the guide wheels 21E and F and the steel cable 2 corresponding to the guide wheels 21E and F generate relative displacement, and the guide wheels 21E and F rotate relative to the anchor rod;
if the position at or near G is expanded, the H guide wheel 21 does not rotate and the relative displacement between the steel cable 2 at the position and the corresponding guide wheel 21 is not generated, but the E, F and G guide wheels 21 and the corresponding steel cable 2 generate relative displacement and the E, F and G guide wheels 21 rotate relative to the anchor rod;
if the position H or the position nearby the H generates outward expansion, the E, F, G and H guide wheels 21 and the corresponding steel cables 2 generate relative displacement, and the E, F, G and H guide wheels 21 rotate relative to the anchor rod;
as shown in fig. 9, a plurality of guide wheels 21 rotatably mounted to the expansion anchor rod 1 are respectively connected to a stroke amplifier, and the stroke amplifier drives a rotation detection unit, when a certain portion of a crack is expanded, the guide wheels 21 at corresponding positions are driven to rotate relative to the expansion anchor rod 1, and then the rotation detection unit detects which guide wheels 21 are rotated (the stroke amplifier has an effect of amplifying the rotation stroke of the guide wheels 21 to achieve better detection), if the E guide wheel 21 rotates, it indicates that the guide wheels are located at the point E or the position area near the point E, if the E and F guide wheels 21 rotate, it indicates that the guide wheels F or the position area near the point E are expanded (the position E may be expanded), if the guide wheels E, F and G rotate, it indicates that the guide wheels G or the position area near the point G are expanded (the positions E and F may be expanded), and if the guide wheels E, F, G and H rotate, it indicates that the guide wheels H or the position area near the point H are expanded (the positions E, F and G may be expanded);
through the process, the working personnel can roughly judge which position areas are required to be expanded outwards and which areas are required to be expanded outwards, so that the working personnel can grasp and know the development situation of the crack more intuitively and comprehensively.
as shown in the enlarged view of fig. 9, a magnet (N pole and S pole) is arranged in the magnetic field ring 32, a magnetic field line is formed in the magnetic field ring 32, and when the conductor rod 22 rotates in the magnetic field ring 32, the base thereof cuts the magnetic induction line to move, and induced electromotive force is generated at two ends of the conductor rod 22, in this embodiment, the conductor rod 22 is electrically connected with a micro-nano ammeter (capable of measuring extremely tiny current, with the resolution up to 0.01 nA) and the micro-nano ammeter and the conductor rod 22 and the conductor rod rotate to form a closed electrical loop (the conductor rod 22 and the rotating installation part thereof are subjected to insulation treatment), so that a worker can know which guide wheels 21 are rotated specifically according to the measurement condition of the micro-nano ammeter, and further know the expansion condition of the crack more comprehensively;
note: in the scheme, except for providing necessary power supply for a voltage stabilizing loop consisting of the resistance plate 9 and the conductive head 8, other components do not consume electric energy, so that the demand of the detector on electric quantity is greatly reduced (the dependency on external environment conditions is small), and the detector has strong adaptability even in harsh areas with outdoor and other conditions.
The above is only for illustrating the invention, it should be understood that the invention is not limited to the above embodiments, and various modifications in accordance with the spirit of the invention are within the scope of the invention.
Claims (9)
1. The bridge crack detector with the restraint function is characterized by comprising a plurality of expansion anchor rods (1) which are arranged on two sides of a crack at intervals in a staggered mode, a steel cable (2) is wound among the expansion anchor rods (1), one end of the steel cable (2) is fixedly connected with the expansion anchor rod (1) positioned at one end and sequentially wound around the subsequent expansion anchor rods (1), and the other end of the steel cable (2) is fixedly connected with the expansion anchor rod (1) positioned at the other end;
a notch is arranged on the steel cable (2) between the two expansion anchor rods (1), one end of the notch is connected with a detection cylinder (4), a detection piston (5) elastically connected with the detection cylinder is arranged in the detection cylinder (4), one end, extending out of the detection cylinder (4), of the detection piston (5) is connected with the other end of the notch, one end of the detection cylinder (4) is communicated with an amplification cylinder (6) through a control pipeline, an amplification piston (7) elastically connected with the amplification cylinder is arranged in the amplification cylinder (6), and one end, extending out of the amplification cylinder (6), of the amplification piston (7) is connected with a telescopic measuring instrument;
the control pipeline is internally provided with a conduction valve, the conduction valve is electrically connected with a microcontroller, and the detection cylinder (4) and the amplification cylinder (6) are filled with hydraulic oil (27).
2. The bridge crack detector with the constraint function according to claim 1, wherein the telescopic measuring instrument comprises a conductive head (8) installed at one end of the amplifying piston (7) extending outwards from the amplifying cylinder (6), a resistance plate (9) in sliding fit contact with the conductive head (8) is arranged on the outer wall of the detecting cylinder (4), the conductive head (8) and the resistance plate (9) are connected in series in a voltage stabilizing loop, a sensitive ammeter is arranged in the voltage stabilizing loop, and the sensitive ammeter is electrically connected with the microcontroller.
3. The bridge crack detector with the constraint function according to claim 1, wherein the control pipeline comprises an adjusting pipe (10), the adjusting pipe (10) is provided with two groups of connecting pipelines (11) connected between the detection cylinder (4) and the amplification cylinder (6) at intervals along the length extension direction of the adjusting pipe, the conduction valve comprises a conduction pipe (12) installed in the adjusting pipe (10) in a sliding manner, the conduction pipe (12) is provided with through holes (13) which are arranged at intervals along the radial direction and matched with the two connecting pipelines (11), and a pressure valve is arranged in one through hole (13);
the conduction pipe (12) is connected with a driving mechanism, and the conduction pipe (12) meets the following requirements: when one of the through holes (13) and the corresponding connecting pipe (11) are not conducted any more, the conducting pipe (12) is moved to a position where the other through hole (13) and the corresponding connecting pipe (11) are located.
4. The bridge crack detector with the restriction function as claimed in claim 3, wherein the driving mechanism comprises a driving cylinder (14), one end of the driving cylinder (14) is communicated with the amplification cylinder (6), a driving piston (15) is elastically connected with the driving cylinder (14) and the driving piston (15) drives the conduit (12) inside the driving cylinder (14).
5. The bridge crack detector with the restriction function as claimed in claim 4, wherein the pressure valve includes a pressure plate (16) elastically installed in the conduction pipe (12) and penetrating through the through hole (13), a positioning mechanism engaged with the pressure plate (16) is provided in the conduction pipe (12), an unlocking mechanism engaged with the positioning mechanism is provided in the conduction pipe (12), a pressure detector is provided in the pressure plate (16), and when the pressure reaches a certain degree, the pressure detector controls the unlocking mechanism to unlock the pressure plate (16).
6. The bridge crack detector with the constraint function according to claim 5, characterized in that the pressure gauge comprises a pressure measuring cavity (17) arranged in the pressure plate (16), one end of the pressure measuring cavity (17) is communicated with the outside, a rubber pad (18) elastically connected with the pressure measuring cavity (17) is arranged at the position where the pressure measuring cavity (17) is communicated with the outside, and the rubber pad (18) and the pressure measuring cavity (17) form a sealed cavity;
the pressure measuring cavity (17) is communicated with an unlocking cylinder (19), an unlocking piston (20) which is elastically connected with the unlocking cylinder is arranged in the unlocking cylinder (19), and the unlocking piston (20) drives the unlocking mechanism.
7. The bridge crack detector with the constraint function according to claim 1, characterized in that a plurality of the expansion anchor rods (1) are provided with guide wheels (21) matched with the steel cable (2), the guide wheels (21) at two ends are fixedly installed with the expansion anchor rods (1), and the guide wheels (21) at the middle position are rotatably installed with the expansion anchor rods (1);
the guide wheels (21) which are rotatably arranged with the expansion anchor rod (1) are respectively connected with a stroke amplifier, and the stroke amplifier drives a rotation detection unit.
8. The bridge crack detector with the constraint function according to claim 7, wherein the rotation detection unit comprises a conductor rod (22) which is rotatably installed on the expansion anchor rod (1) and is driven by a stroke amplifier, a magnetic field ring (32) which takes the conductor rod (22) as a center is arranged on the expansion anchor rod (1), the conductor rod (22) is electrically connected with a micro-nano ammeter, and the conductor rod and the micro-nano ammeter form a closed loop.
9. A bridge crack detection method, which adopts the bridge crack detector with the constraint function as claimed in any one of claims 1-8, is characterized by comprising the following steps:
s1: a plurality of expansion anchor rods are arranged around the crack in a staggered and spaced mode, and a steel cable is wound among the expansion anchor rods;
s2: a gap is arranged on the steel cable fan between two adjacent expansion anchor rods, and the detector is arranged in the gap;
s3: when a position of the crack has an outward expansion trend, the expansion anchor rod at the corresponding position is forced to generate displacement and stretch the steel cable, and the stretching amount of the steel cable is determined through a detector;
s4: in the process of crack detection period, the detection and constraint application of the crack are alternately carried out along with the expansion situation of the crack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211625489.2A CN115852863A (en) | 2022-12-16 | 2022-12-16 | Bridge crack detector with constraint function and detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211625489.2A CN115852863A (en) | 2022-12-16 | 2022-12-16 | Bridge crack detector with constraint function and detection method |
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| CN115852863A true CN115852863A (en) | 2023-03-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117738075A (en) * | 2023-12-15 | 2024-03-22 | 广东合泰实业科技有限公司 | Bridge crack measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117738075A (en) * | 2023-12-15 | 2024-03-22 | 广东合泰实业科技有限公司 | Bridge crack measuring device |
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