CN111366616A - Steel bridge deck fatigue crack measuring device and method - Google Patents
Steel bridge deck fatigue crack measuring device and method Download PDFInfo
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- CN111366616A CN111366616A CN202010465712.6A CN202010465712A CN111366616A CN 111366616 A CN111366616 A CN 111366616A CN 202010465712 A CN202010465712 A CN 202010465712A CN 111366616 A CN111366616 A CN 111366616A
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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Abstract
The invention relates to the technical field of detection, in particular to a steel bridge deck fatigue crack measuring device, which comprises: the resistance wire unwinding device is provided with a resistance detection circuit and a resistance wire winding and unwinding roller, and resistance wires are symmetrically wound on the resistance wire unwinding device from a resistance wire fixing point in the middle to two sides; the fixed guide device comprises two guide rollers which are respectively used for carrying out 150-180-degree direction transformation on the resistance wire led out from the winding tail ends at the two sides of the resistance wire, guiding the direction to the resistance wire unwinding device and connecting the direction to the resistance detection circuit; the resistance wire unwinding device and the fixed guiding device are fixedly arranged on two sides of the fatigue crack to be measured, and the crack is measured through resistance change of the resistance wire caused by length change. By the technical scheme, automatic accurate measurement can be realized, the measurement precision is improved, and the operation difficulty can be effectively reduced. Meanwhile, the invention also discloses a method for measuring the fatigue cracks of the steel bridge deck slab.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a device and a method for measuring fatigue cracks of a steel bridge deck.
Background
The steel bridge panel is formed by welding a plurality of thin plate parts such as a panel and a longitudinal stiffening rib, a transverse stiffening rib and the like, an arc-shaped notch is formed in the cross position of a welding line, the construction details are quite complex, when a vehicle passes through, under the combined action of vehicle load, temperature load and residual stress, local stress is easily generated at the cross welding position of a top plate and the stiffening rib, the butt welding joint of the stiffening rib, the cross welding position of the top plate and a transverse clapboard, the cross welding position of the stiffening rib and the transverse clapboard and other steel plate cross welding positions, deformation is quite complex, and fatigue cracks can be generated.
In the detection method of the fatigue cracks of the orthotropic steel bridge deck slab, the most widely used method and the simplest method are observation methods, but in the application process of the method, due to the uncertainty of personnel, the detection result depends on the professional degree of the operator, and the accurate result is difficult to obtain.
In view of the above-mentioned existing defects, the inventor of the present invention has made extensive practical experience and professional knowledge for many years in the design and manufacture of such products, and has actively studied and innovated in cooperation with the application of the theory, in order to create a device and a method for measuring fatigue cracks of a steel bridge deck, so that the device and the method have higher practicability.
Disclosure of Invention
The invention provides a device for measuring fatigue cracks of a steel bridge deck, thereby effectively solving the problems in the background technology. Meanwhile, the invention also discloses a measuring method of the steel bridge deck fatigue crack measuring device.
In order to achieve the purpose, the invention adopts the technical scheme that:
a steel decking fatigue crack measuring apparatus, comprising:
the resistance wire unwinding device is provided with a resistance detection circuit and a resistance wire winding and unwinding roller, and resistance wires are wound on the resistance wire winding and unwinding roller symmetrically towards two sides from a resistance wire fixing point in the middle;
the fixed guide device comprises two guide rollers which are perpendicular to the axis of the resistance wire winding and unwinding roller, and the two guide rollers are respectively used for conducting 150-180-degree direction transformation on the resistance wire led out from the winding tail ends of the two sides of the resistance wire and guiding the resistance wire to the resistance wire unwinding device to be connected into the resistance detection circuit;
the resistance wire unwinding device and the fixed guiding device are fixedly arranged on two sides of the crack to be measured, the length of the resistance wire is guaranteed to be a fixed value, and the crack is measured through resistance change of the resistance wire caused by length change.
Furthermore, magnetic adsorption devices are arranged on the resistance wire unwinding device and/or the fixed guide device.
Furthermore, the two ends of the resistance wire winding and unwinding roller are fixed through a seat structure and a bearing embedded in the seat structure, wherein at least one end of the resistance wire winding and unwinding roller is arranged in a protruding mode relative to the seat structure and is connected with an elastic reset structure, and the resistance wire is wound and unwound elastically.
Furthermore, the seat body is structurally provided with a locking structure for fixing the resistance wire winding and unwinding roller after the unwinding length of the resistance wire is set.
Further, the resistance wire unwinding device comprises a first shell and a first cover body;
the first casing is internally provided with an installation cavity, the installation cavity is provided with an open end for leading out the resistance wire, and the first cover body covers the local part of the open end.
Furthermore, metal bands are embedded in the side wall of the mounting cavity, are respectively arranged on two sides of the resistance wire winding and unwinding roller and are used for connecting the resistance wire into the resistance detection circuit;
and all parts in the resistance detection circuit are distributed in the installation cavity and positioned in the spaces at two sides of the resistance wire winding and unwinding roller.
Further, the fixed guide device comprises a second shell and a second cover body;
the second shell part is an installation cavity and is provided with an open end for leading the resistance wire, and the second cover body covers part of the open end;
and two ends of the guide roller are respectively fixed through the second shell and the second cover body.
Furthermore, a film covering and unwinding roller is arranged in the mounting cavity and parallel to the resistance wire winding and unwinding roller and used for providing a film body structure for covering the resistance wire, and a strip-shaped opening for leading the film body structure out is formed in the first cover body.
A steel bridge deck fatigue crack measuring method comprises the following steps:
the circuit connection is used for forming a resistance detection circuit which can measure the resistance value through the length change of the resistance wire;
fixing two ends of at least part of the length of the resistance wire on two sides of a fatigue crack to be measured respectively, and changing the length of the resistance wire through the change of the crack;
and the resistance detection circuit measures the fatigue cracks through the resistance value change of the resistance wire.
Further, before fixing the two ends of at least part of the length of the resistance wire, coating an insulating colloid in the range of the steel plate covered by the resistance wire so that the resistance wire is attached to the steel plate, arranging a membrane structure to cover the insulating colloid and the resistance wire, and carrying out measurement after the insulating colloid is cured.
Through the technical scheme of the invention, the following technical effects can be realized:
according to the invention, automatic accurate measurement can be realized, the measurement precision is improved, and the operation difficulty can be effectively reduced. Meanwhile, the invention also discloses a method for measuring the fatigue cracks of the steel bridge deck slab, which has the same technical effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a steel deck plate fatigue crack measuring device in use;
FIG. 2 is a schematic view of the steel deck plate fatigue crack measuring device of FIG. 1 partially open;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is an enlarged view of a portion of FIG. 2 at B;
FIG. 5 is an enlarged view of a portion of FIG. 2 at C;
fig. 6 is a schematic diagram of an internal structure of the resistance wire unwinding device (omitting a resistance detection circuit);
FIG. 7 is a schematic view showing the internal structure of the fixed guide;
FIG. 8 is an enlarged view of a portion of FIG. 7 at D;
FIG. 9 is a schematic diagram of the use of the membrane structure;
FIG. 10 is an enlarged partial view of the right side of FIG. 9;
FIG. 11 is a comparison of two treatment modes of the resistance wire at the corner;
reference numerals: resistance wire unwinding device 1, first casing 11, first lid 12, strip opening 12a, strap 13, resistance wire winding and unwinding roller 2, resistance wire fixed point 21, resistance wire 3, fixed guider 4, second casing 41, second lid 42, guide roll 5, magnetic adsorption device 6, pedestal structure 7, tectorial membrane unreel roller 8, membrane structure 9.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. This embodiment is written in a progressive manner.
As shown in FIGS. 1-11, a steel bridge deck fatigue crack measuring device comprises: the resistance wire unwinding device 1 is provided with a resistance detection circuit and a resistance wire winding and unwinding roller 2, and resistance wires 3 are symmetrically wound on the resistance wire winding and unwinding roller 2 from a resistance wire fixing point 21 in the middle of the resistance wire winding and unwinding roller to two sides; the fixed guide device 4 comprises two guide rollers 5 which are perpendicular to the axis of the resistance wire winding and unwinding roller 2, and the two guide rollers 5 are respectively used for conducting 150-180-degree direction transformation on the resistance wire 3 which is led out from the winding tail ends of the two sides of the resistance wire 3 and guiding the direction transformation to the resistance wire unwinding device 1 to be connected into a resistance detection circuit; resistance wire unwinding device 1 and fixed guider 4 are fixed to be set up in the both sides of awaiting measuring the crackle, and guarantee that 3 length of resistance wire are the definite value, carry out the crackle through resistance change that resistance wire 3 arouses by length change and measure.
In the invention, the total length of the resistance wire 3 connected into the resistance detection circuit is constant, the ratio of the length of the winding part to the length of the leading-out part can be realized by adjusting the distance between the resistance wire unwinding device 1 and the fixed guide device 4, the adjustment of the ratio can not cause the change of the resistance value of the winding part, after the ratio is determined, the length setting of the leading-out part of the resistance wire 3 is completed, and only the resistance wire unwinding device 1 and the fixed guide device 4 are respectively fixed on two sides of a fatigue crack to be measured. The device can enable the resistance wire 3 to obtain better support and guide, ensures the stability in the measuring process, can realize automatic accurate measurement after the position is determined, and can effectively reduce the operation difficulty while improving the measuring precision.
In view of installation, the resistance wire unwinding device 1 and/or the fixed guide device 4 are provided with magnetic adsorption devices 6. Thereby make the two convenient and fast more at fixed in-process, only can accomplish the definite of position through the mode of adsorbing the laminating, certainly, magnetic adsorption's stability need be controlled through the size of magnetic force, and specific can be for embedding inside magnetic structure, also can be for installing in the magnetic structure on top layer, and the permanent magnet can reduce the cost in the use.
As the optimization of the above embodiment, the two ends of the resistance wire winding and unwinding roller 2 are fixed by the seat structure 7 and the bearing embedded in the seat structure 7, wherein at least one end of the resistance wire winding and unwinding roller 2 is arranged in a protruding manner relative to the seat structure 7 and is connected with the elastic reset structure, so that the elastic winding of the resistance wire 3 is realized.
As shown in fig. 5, the elastic reset structure is not shown, but the torsion spring type structure can be selected from the prior art to achieve the above purpose, and the fixing manner of the torsion spring can also be selected according to the actual requirement, when the number of the elastic reset structures is selected, the torsion spring type structure is preferably arranged on both sides of the resistance wire winding and unwinding roller 2, so as to ensure the effectiveness and the sensitivity of the reset. The arrangement of the elastic reset structure enables the resistance wire 3 to be pulled and led out by the fixed guide device 4, and the tendency of winding recovery can be obtained, so that winding can be realized by mutual approaching of the resistance wire unwinding device 1 and the fixed guide device 4 after measurement is finished, and after winding is finished, the resistance wire unwinding device 1 and the fixed guide device 4 can be accommodated in a fit manner, so that transportation and storage are facilitated.
Of course, when the elastic reset structure is not arranged, the winding can be carried out in a manual mode, and the purpose of the invention can be achieved. It should be emphasized here that, in the process of measuring the resistance wire 3, there may be a case without length change, in which case, the resistance value before and after measurement is unchanged, and it can be assumed that the fatigue crack at this point is not developed; however, when the length of the resistance wire is changed, the resistance wire 3 which is used and wound needs to be calibrated again when being used next time, in order to avoid the complexity of the situation, the resistance wire 3 can also be used as a consumable material and replaced for a single time, the fixing mode is relatively simple, and the influence on the operation efficiency is small.
As the optimization of the above embodiment, the seat structure 7 is provided with a locking structure for fixing the resistance wire winding and unwinding roller 2 after the unwinding length of the resistance wire 3 is set. When the selection is specific, a bolt type structure can be arranged to achieve the locking purpose, and the bolt hole positions are correspondingly arranged at the end parts of the seat body structure 7 and the resistance wire winding and unwinding roller 2, so that the locking device is simple and convenient. If the locking structure is not arranged, the unreeling length of the resistance wire 3 at each time needs to be ensured to be the maximum, so that the fixing of the measured length is realized.
As shown in fig. 6, the resistance wire unwinding device 1 includes a first housing 11 and a first cover 12; the first casing 11 is provided with an installation cavity therein, the installation cavity is provided with an open end for leading out the resistance wire 3, and the first cover 12 covers a part of the open end. Through the arrangement of the first cover body 12, the whole installation cavity body obtains a position for operation, the installation cavity body provides a space for installation layout for each part, and specifically, in order to facilitate the installation and fixation of the resistance wire 3, metal bands 13 are embedded on the side walls of the installation cavity body, are respectively arranged on two sides of the resistance wire winding and unwinding roller 2, and are used for connecting the resistance wire 3 into a resistance detection circuit; all parts in the resistance detection circuit are distributed in the space of the installation cavity, which is positioned at two sides of the resistance wire winding and unwinding roller 2. Wherein the metal sheet 13 needs to be insulated from the sidewall of the cavity and effectively connected into the circuit.
In whole installation cavity, use resistance wire receive and release roller 2 as intermediate position, set up installation space respectively at both ends, and set up resistance wire 3's even income end in installation space, make whole resistance wire unwinding device 1 obtain relatively stable weight distribution, thereby guarantee the relative stability among the fixed process, wherein, the permanent magnet in the magnetic adsorption device 6 in the above-mentioned embodiment also can select to imbed the installation cavity, the permanent magnet is fixed in on the measuring steel bridge panel through magnetism is effectual with casing 11.
Also as a layout modification of the structure, as shown in fig. 7, the fixing guide 4 includes a second housing 41 and a second cover 42; the second casing 41 is internally provided with a mounting cavity having an open end for the resistance wire 3 to be introduced, and the second cover 42 covers a part of the open end; both ends of the guide roller 5 are fixed by the second case 41 and the second cover 42, respectively.
The above structure is similar to that of the resistance wire unwinding device 1, wherein two ends of the guide roller 5 are fixed together through the second housing 41 and the second cover 42, so that on one hand, the positioning and guiding of the two positions are realized, and on the other hand, the winding of the resistance wire is more convenient. In the preferred embodiment, the requirement for the installation accuracy of the guide roller 5 is relatively low, both ends of the guide roller are fixedly or rotatably connected with the second housing 41 and the second cover 42, a rolling layer can be sleeved outside the guide roller, and the rolling layer can also be provided with a groove structure for guiding the resistance wire 3, as shown in fig. 8, the guide roller 5 can realize positioning and reduce friction force in the process of rolling and guiding the resistance wire 3.
In order to optimize the using method and ensure that the measuring process is not influenced by the external environment, a film coating unwinding roller 8 is arranged in the mounting cavity and parallel to the resistance wire winding and unwinding roller 2 and used for providing a film body structure 9 for covering the resistance wire, and a strip-shaped opening 12a for leading out the film body structure 9 is arranged on the first cover body 12.
In the measuring process, due to the diversification of the bridge structure and the complication of the application scene, various situations can exist in the measuring process, in order to avoid the influence of emergency situations on the measuring process, before the measurement, after the length of the resistance wire 3 is stable, the resistance wire is preferably adhered to the steel plate structure through insulating glue, and meanwhile, the resistance wire is covered through the insulating waterproof membrane structure 9, so that the stable measuring effect is ensured. The insulating colloid can be coated on the steel plate structure in a brushing mode, the type selection has no special requirements, only the insulation is required, and the bonding force is ensured, the selection of the film body structure 9 also has no special requirements, various plastic film forms can be applied to the invention, wherein the reason that the feeding part of the film body structure 9 is arranged in the resistance wire unwinding device 1 is firstly positioned when the part of the structure is installed, and the extraction length of the resistance wire 3 is adjusted by moving the fixed guide device 4, so the operation is more convenient by simplifying the structure of the fixed guide device 4 as much as possible.
As shown in fig. 9 and 10, which illustrate the form of the covering of the film body structure 9, the broken lines in fig. 10 are cutting lines, through which the film body structure 9 can be divided. The optimal scheme enables the whole device to obtain more application scenes, the form shown in fig. 9 is suitable for the butt joint position of the planar plate body, and the resistance wire 3 is in a linear state; and when the position department that needs carry out the direction change to resistance wire 3 to roof and stiffening rib cross welding department etc. is measured, insulating colloid carries out the mode that adheres to resistance wire 3 and can guarantee that resistance wire 3 is applicable to concrete operating mode and carries out the fixed use of adaptability. As shown in fig. 11, the comparison of the two processing modes of the resistance wire 3 at the corner is shown: in the first form, the resistance wire 3 is arranged at the corner in a fitting manner; in the second form, the resistance wire forms a triangular space between the corner and the steel plates which are arranged crosswise, so that the measurement sensitivity can be increased under the situation, and the two modes can be selected according to actual needs. Of course, the mode of the insulating colloid adhesion is only suitable for the scene that the resistance wire 3 is used as a consumable material.
The resistance detection circuit and the signal transmission mode of the resistance detection circuit and the control system are not specifically limited in the invention, the above contents can be obtained in the prior art, and the problem of influencing operation difficulty including wireless transmission, wired transmission and the like of signals can also be realized by various modes in the prior art. The present invention is limited only by the structure of the device itself, and the specific manner of measurement thereof.
A steel bridge deck fatigue crack measuring method comprises the following steps:
the circuit connection is adopted to form a resistance detection circuit which can measure the resistance value through the length change of the resistance wire 3;
fixing two ends of at least part of the length of the resistance wire 3 on two sides of a fatigue crack to be measured respectively, and changing the length of the resistance wire 3 through the change of the crack;
the resistance detection circuit measures the fatigue cracks through the resistance value change of the resistance wire 3.
As a preferred example of the above embodiment, before fixing both ends of at least a part of the length of the resistance wire 3, coating the insulation colloid in the range of the steel plate covered by the resistance wire 3, so that the resistance wire 3 is attached to the steel plate, and providing the film structure 9 to cover the insulation colloid and the resistance wire 3, the measurement operation is performed after the insulation colloid is cured.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A steel decking fatigue crack measuring device, characterized by, includes:
the resistance wire unwinding device (1) is provided with a resistance detection circuit and a resistance wire winding and unwinding roller (2), and resistance wires (3) are wound on the resistance wire winding and unwinding roller (2) symmetrically towards two sides from a resistance wire fixing point (21) in the middle;
the fixed guide device (4) comprises two guide rollers (5) which are perpendicular to the axis of the resistance wire winding and unwinding roller (2), and the two guide rollers (5) are respectively used for conducting 150-180-degree direction conversion on the resistance wire (3) led out from the winding tail ends of the two sides of the resistance wire (3) and guiding the resistance wire to the resistance wire unwinding device (1) to be connected into the resistance detection circuit;
the resistance wire unwinding device (1) and the fixed guiding device (4) are fixedly arranged on two sides of the crack to be measured, the length of the resistance wire (3) is guaranteed to be a fixed value, and the crack is measured through resistance change of the resistance wire (3) caused by length change.
2. The steel bridge deck plate fatigue crack measuring device of claim 1, wherein a magnetic adsorption device (6) is arranged on each of the resistance wire unwinding device (1) and/or the fixed guide device (4).
3. The steel bridge deck fatigue crack measuring device of claim 1 or 2, wherein two ends of the resistance wire winding and unwinding roller (2) are fixed through a seat structure (7) and a bearing embedded in the seat structure (7), wherein at least one end of the resistance wire winding and unwinding roller (2) is arranged in a protruding manner relative to the seat structure (7) and is connected with an elastic reset structure, so that the resistance wire (3) is wound elastically.
4. The steel bridge deck fatigue crack measuring device of claim 3, wherein a locking structure is arranged on the seat body structure (7) and used for fixing the resistance wire winding and unwinding roller (2) after the unwinding length of the resistance wire (3) is set.
5. The steel bridge deck plate fatigue crack measuring device of claim 1, wherein the resistance wire unwinding device (1) comprises a first shell (11) and a first cover (12);
the inner part of the first shell (11) is provided with an installation cavity, the installation cavity is provided with an open end for leading out the resistance wire (3), and the first cover body (12) covers the local part of the open end.
6. The steel bridge deck fatigue crack measuring device of claim 5, wherein metal bands (13) are embedded on the side walls of the mounting cavity, are respectively arranged on two sides of the resistance wire winding and unwinding roller (2), and are used for connecting the resistance wire (3) into the resistance detection circuit;
and all parts in the resistance detection circuit are distributed in the space of the installation cavity, which is positioned at two sides of the resistance wire winding and unwinding roller (2).
7. A steel deck plate fatigue crack measuring device according to any of claims 1, 5 or 6, wherein said stationary guiding means (4) comprises a second housing (41) and a second cover (42);
the interior of the second shell (41) is provided with an installation cavity and an open end for leading the resistance wire (3), and the second cover body (42) covers part of the open end;
and two ends of the guide roller (5) are respectively fixed through the second shell (41) and the second cover body (42).
8. The steel bridge deck fatigue crack measuring device of claim 5, characterized in that a film covering and unwinding roller (8) is arranged in the mounting cavity in parallel with the resistance wire winding and unwinding roller (2) and used for providing a film body structure (9) for covering the resistance wire, and a strip-shaped opening (12 a) for leading out the film body structure (9) is arranged on the first cover body (12).
9. A method for measuring fatigue cracks of a steel bridge deck is characterized by comprising the following steps:
the circuit is connected to form a resistance detection circuit which can measure the resistance value through the length change of the resistance wire (3);
fixing two ends of at least part of the length of the resistance wire (3) on two sides of a fatigue crack to be measured respectively, and changing the length of the resistance wire (3) through the change of the crack;
the resistance detection circuit measures fatigue cracks through resistance value changes of the resistance wire (3).
10. The method for measuring the fatigue crack of the steel bridge deck plate as claimed in claim 9, wherein before fixing the two ends of at least part of the length of the resistance wire (3), the steel plate covered by the resistance wire is coated with an insulating colloid, so that the resistance wire (3) is attached to the steel plate, a membrane structure (9) is arranged to cover the insulating colloid and the resistance wire (3), and the measurement operation is performed after the insulating colloid is cured.
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| CN111366616B (en) | 2020-08-11 |
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