CN111220368A - Fatigue damage model test platform and method for connecting bolt of fabricated lining segment - Google Patents
Fatigue damage model test platform and method for connecting bolt of fabricated lining segment Download PDFInfo
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- CN111220368A CN111220368A CN202010061296.3A CN202010061296A CN111220368A CN 111220368 A CN111220368 A CN 111220368A CN 202010061296 A CN202010061296 A CN 202010061296A CN 111220368 A CN111220368 A CN 111220368A
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Abstract
The embodiment of the invention provides a fatigue damage model test platform for a connecting bolt of an assembled lining segment, which comprises: the device comprises a pulse generating circuit, a pump station, an electromagnetic directional valve, an oil cylinder and a test piece mounting platform bracket; the output end of the pulse generating circuit is connected with the action signal input end of the electromagnetic valve reversing valve, the pump station is connected with the input end of the electromagnetic valve, the output end of the electromagnetic valve is connected with the oil cylinder, the oil cylinder is connected with the segment test piece, and the test piece mounting platform support is used for fixing the segment test piece and limiting the displacement of the segment test piece in the horizontal and vertical directions. The invention provides a model test platform and a method for researching the stress change characteristics of a tunnel fabricated lining bolt structure and a fatigue damage mechanism thereof under the action of pulling-pressing cyclic pneumatic load, so as to predict the fatigue damage life of the whole fabricated lining structure and the bolt based on a pneumatic load spectrum.
Description
Technical Field
The invention relates to the technical field of assembled lining of a high-speed railway tunnel, in particular to a fatigue damage model test platform and a fatigue damage model test method for an assembled lining segment connecting bolt.
Background
With the continuous forward development of the high-speed railway technology in China and the manufacture of high-speed trains with higher speed, the aerodynamic effect generated when the high-speed trains enter the tunnel is more severe, the effect can not only cause discomfort to eardrums of passengers, but also bring potential safety hazards to workers in the tunnel, and meanwhile, the pneumatic fluctuation pressure influence can also be generated on lining structures and equipment in the tunnel. Particularly, when the high-speed railway tunnel adopts an assembly type lining structure, two conditions occur on the surface of the assembly type lining, firstly, the surface is uneven, secondly, because the form of assembling the duct pieces is adopted, a plurality of assembling seams occur on the assembly type lining tunnel, and particularly, the phenomenon of dislocation of the duct pieces can occur under the condition of not-in-place assembling management. All of these conditions result in further complicating the aerodynamic effects of the high speed train entering the tunnel. Due to the long-term tension and compression effects of the pneumatic load on the duct piece (calculated according to the 100-year service life of the existing high-speed railway tunnel lining), the bolts of the duct piece connecting part are easy to fatigue damage and lose effectiveness, and finally the whole lining structure is unstable to generate great potential safety hazards, so that the driving safety of trains and the life safety of passengers are endangered. Therefore, if the high-speed railway tunnel is lined in a fabricated manner, the influence of the pneumatic effect on the fatigue damage of the lining structure is considered. In the fabricated lining structure, the strength and rigidity of the assembled duct piece are far greater than those of the bolts, so that the problems of fatigue damage and failure of the duct piece connecting bolts are considered firstly under the action of a pneumatic load generated when a high-speed train enters the fabricated lining tunnel.
Disclosure of Invention
The embodiment of the invention provides a fatigue damage model test platform and method for an assembled lining segment connecting bolt, which aim to overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme.
The utility model provides an assembled lining segment connecting bolt fatigue damage model test platform, includes: the device comprises a pulse generating circuit, a pump station, an electromagnetic directional valve, an oil cylinder and a test piece mounting platform bracket;
the output end of the pulse generating circuit is connected with the action signal input end of the electromagnetic valve reversing valve, the pump station is connected with the input end of the electromagnetic valve, the output end of the electromagnetic valve is connected with the oil cylinder, the oil cylinder is connected with the segment test piece, and the test piece mounting platform support is used for fixing the segment test piece and limiting the displacement of the segment test piece in the horizontal and vertical directions.
Preferably, the test piece mounting platform support is used for fixing two adjacent segment test pieces, and the two segment test pieces are connected through bolts;
the oil cylinder is used for applying alternating tension-compression loads to two adjacent segment test pieces, namely simulating pneumatic loads;
the pulse generating circuit outputs periodic square waves to drive the electromagnetic reversing valve to reverse.
Preferably, the test platform further comprises: manometer, motor, oil tank and overflow valve, the input and the pump station of overflow valve are connected, the output and the oil tank of overflow valve are connected, the hydro-cylinder is to the maximum load of section of jurisdiction test piece by the overflow valve is transferred.
A test method using the platform, comprising the steps of:
s1, installing test fabricated lining segments, connecting adjacent segment test pieces through bolts, and detecting the installation quality of the test pieces, wherein all dimensional deviations and service performance meet the qualified requirement indexes specified by relevant standards;
s2, if the test piece is qualified, fixing the segment test piece on the test piece mounting platform bracket to ensure that the oil cylinder piston rod is in direct contact with the segment test piece;
s3, controlling the expansion speed of the oil cylinder piston rod from low to high by controlling the output oil quantity of the pump station, driving the oil cylinder piston rod to apply tension and compression load to the segment test piece, enabling connecting bolts between adjacent segment test pieces to be stressed, and recording time;
and S4, carrying out multiple groups of experiments, wherein each group of experiments are cycled for multiple times, and stopping to check the condition of the test piece connecting bolt of the tube piece after reaching the preset cycle times and recording.
According to the technical scheme provided by the embodiment of the invention, the embodiment of the invention provides a fatigue damage model test platform and a fatigue damage model test method for the connecting bolt of the fabricated lining segment, a pulse generation circuit outputs periodic square waves to drive a solenoid directional valve to change the direction, the flow direction of oil entering an oil cylinder is changed, and the extension or retraction of a piston rod of the oil cylinder is realized, so that the segment is pulled and pressed to simulate a pneumatic load, the stress change characteristic of the assembled lining bolt structure of the tunnel and the fatigue damage mechanism of the assembled lining bolt structure under the action of the pull-press cyclic pneumatic load are further researched, and the prediction of the fatigue damage life of the assembled lining structure and the bolt based on a pneumatic load spectrum is realized.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1a is a schematic view of a fatigue damage model test platform for a fabricated lining segment connecting bolt according to an embodiment of the present invention (a cylinder is disposed under a segment on one side);
FIG. 1b is a schematic view of a fatigue damage model test platform for a fabricated lining segment connecting bolt according to an embodiment of the present invention (oil cylinders are disposed under segments on both sides);
fig. 2 is a schematic diagram of a hydraulic system and a control circuit of a fatigue damage model test platform for a fabricated lining segment connecting bolt provided by an embodiment of the invention.
Reference numerals:
1, pulling and pressing an oil cylinder; 2-an electromagnetic directional valve; 3-a pressure gauge; 4-an overflow valve; 5-a pump station; 6, a motor; 7-an oil tank; 8-a pulse circuit; 9-a duct piece; 10-bolt; 11-test piece mounting platform support; 12-drawing an oil inlet; 13-a propelling oil port; 14-piston rod.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
The embodiment of the invention provides a fatigue damage model test platform for a connecting bolt of an assembled lining segment, which comprises the following components as shown in figures 1a, 1b and 2: the device comprises an oil cylinder 1, an electromagnetic directional valve 2, a pressure gauge 3, an overflow valve 4, a pump station 5, a motor 6, an oil tank 7, a pulse generation circuit 8 and a test piece mounting platform support 11 (the test piece mounting platform support 11 is used for fixing a segment test piece and limiting the displacement of the test piece in the horizontal and vertical directions). The output end of the pulse generating circuit 8 is connected with the action signal input end of the electromagnetic valve reversing valve 2, the pump station 5 is connected with the input end of the electromagnetic valve 2, the output end of the electromagnetic valve 2 is connected with the oil cylinder 1, and the oil cylinder 1 is connected with the segment test piece. The input end of the overflow valve 4 is connected with the pump station 5, the output end of the overflow valve is connected with the oil tank 7, the pressure gauge 3 is connected into an input pipeline of the electromagnetic directional valve 2, and the motor 6 is connected with the pump station 5.
As shown in fig. 1a and 1b, the mounting platform support is used for fixing two adjacent segment test pieces, and the two segments are connected through bolts; the oil cylinder 1 is in contact with the duct pieces 9 and is used for applying alternating tension-compression loads to two adjacent duct pieces 9. The expansion speed of the cylinder piston rod 14 is determined by the output oil flow of the pump station 5, and the maximum load on the pipe piece 9 is set by the overflow valve 4 and generally corresponds to the maximum pneumatic load borne by the pipe piece 9. It should be pointed out that fig. 1a only has set up hydro-cylinder 1 device at one side section of jurisdiction, and the left side section of jurisdiction is fixed completely, and the right side section of jurisdiction can produce vertical displacement under the effect of hydro-cylinder piston rod. According to the actual model test needs, can all set up the hydro-cylinder device in one side or both sides section of jurisdiction and control the section of jurisdiction borne pressure respectively, like figure 1b promptly all set up the hydro-cylinder device at the section of jurisdiction of both sides, control the side section of jurisdiction and all can produce vertical displacement about.
When the piston rod 14 of the oil cylinder extends out, upward pushing force is applied to the pipe sheet 9, and pneumatic positive pressure load is simulated; a downward pulling force is applied to the tube sheet 9 as the cylinder piston rod 14 is retracted, simulating a negative pneumatic load. As shown in fig. 2, the pulse generating circuit 8 outputs periodic square waves to drive the electromagnetic directional valve 2 to change the direction, so as to change the flow direction of oil entering the oil cylinder 1, extend or retract the piston rod 14, and perform the tension and compression action on the duct piece 9, wherein the design value of the tension and compression pneumatic load is +/-6 kPa. At present, according to the existing research results: the maximum positive pressure generated when the high-speed train with the speed of 350km/h enters the tunnel is not more than 4kPa, and the maximum negative pressure is not more than 5 kPa. If the higher speed is considered, such as 400km/h, 420km/h, 480km/h, 500km/h and the like, the maximum positive pressure peak value and the maximum negative pressure peak value can be obtained through numerical simulation calculation, and a safety factor of about 1.3-1.5 times is multiplied on the basis of the calculated peak values to obtain the maximum measuring range of the test, wherein the frequency is not less than 2 HZ.
The embodiment of the invention provides a test method using a fatigue damage model test platform for an assembled lining segment connecting bolt for reference, and related personnel in the field can easily repeat the test steps or improve the test steps according to actual needs. The fatigue damage model test of the connecting bolt of the assembled lining segment under the action of pneumatic load comprises the following steps:
s1, installing and testing the assembled lining segment, connecting the adjacent segments by bolts (segment + bolt + segment), and detecting the installation quality, wherein all the dimensional deviation and the service performance should reach the qualified requirement indexes specified by the relevant standards.
And S2, if the test piece is qualified, fixing the test piece on the test piece mounting platform bracket to ensure that the piston rod is in direct contact with the duct piece.
S3, controlling the expansion speed of the oil cylinder piston rod from low to high by controlling the output oil quantity of the pump station, driving the oil cylinder piston rod to apply tension and compression load to the duct piece (the piston rod can not directly act on the bolt, and the duct piece is forced by pneumatic load to pull the bolt), so that the connecting bolt between adjacent duct pieces is stressed, and simultaneously recording time (so as to calculate the load cycle times through the output frequency of the pulse generation circuit). If abnormal sound occurs in the test, the test should be stopped immediately. The test cannot be continued until the cause is not identified and resolved.
And S4, after the test is carried out for 20 ten thousand times per cycle, stopping the machine to check the condition of the tube piece connecting bolt, and recording so as to find out the time when the tube piece connecting bolt breaks down and the cycle times of simulating the tension-compression load at the moment in time.
And S5, after the test is circulated for 200 ten thousand times, stopping the machine to check the conditions of the bolts and the pipe pieces, and recording.
In addition, before the test is implemented, various counting devices are calibrated, and the data acquisition system is preliminarily debugged to enable instruments and equipment of the system to be in a normal state, so that the various sensors are ensured to be correctly wired and firmly connected. The safety protection measures must be tested in place. After the test, the test data is checked in time.
In conclusion, the novel test device provided by the invention can assist in researching the stress change characteristics of the assembled lining bolt structure of the tunnel under the action of the pulling-pressing cyclic pneumatic load and reveal the fatigue damage mechanism of the assembled lining bolt structure, so that an accumulated damage model and a nonlinear fatigue damage evolution equation for describing the assembled lining structure of the tunnel are established, the fatigue damage life of the assembled lining structure and the bolt under the pneumatic load spectrum is predicted, the reliability design method of the assembled lining structure of the high-speed railway tunnel is finally established, and scientific basis is provided for the comprehensive durability design of the whole life of the assembled lining structure of the high-speed railway tunnel in China.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The utility model provides an assembled lining segment connecting bolt fatigue damage model test platform which characterized in that includes: the device comprises a pulse generating circuit, a pump station, an electromagnetic directional valve, an oil cylinder and a test piece mounting platform bracket;
the output end of the pulse generating circuit is connected with the action signal input end of the electromagnetic valve reversing valve, the pump station is connected with the input end of the electromagnetic valve, the output end of the electromagnetic valve is connected with the oil cylinder, the oil cylinder is connected with the segment test piece, and the test piece mounting platform support is used for fixing the segment test piece and limiting the displacement of the segment test piece in the horizontal and vertical directions.
2. The test platform of claim 1, wherein the test piece mounting platform support is used for fixing two adjacent segment test pieces, and the two segment test pieces are connected through bolts;
the oil cylinder is used for applying alternating tension-compression loads to two adjacent segment test pieces, namely simulating pneumatic loads;
the pulse generating circuit outputs periodic square waves to drive the electromagnetic reversing valve to reverse.
3. The test platform according to claim 1 or 2, further comprising: manometer, motor, oil tank and overflow valve, the input and the pump station of overflow valve are connected, the output and the oil tank of overflow valve are connected, the hydro-cylinder is to the maximum load of section of jurisdiction test piece by the overflow valve is transferred.
4. A test method using the platform of any one of claims 1 to 3, comprising the steps of:
s1, installing test fabricated lining segments, connecting adjacent segment test pieces through bolts, and detecting the installation quality of the test pieces, wherein all dimensional deviations and service performance meet the qualified requirement indexes specified by relevant standards;
s2, if the test piece is qualified, fixing the segment test piece on the test piece mounting platform bracket to ensure that the oil cylinder piston rod is in direct contact with the segment test piece;
s3, controlling the expansion speed of the oil cylinder piston rod from low to high by controlling the output oil quantity of the pump station, driving the oil cylinder piston rod to apply tension and compression load to the segment test piece, enabling connecting bolts between adjacent segment test pieces to be stressed, and recording time;
and S4, carrying out multiple groups of experiments, wherein each group of experiments are cycled for multiple times, and stopping to check the condition of the test piece connecting bolt of the tube piece after reaching the preset cycle times and recording.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010061296.3A CN111220368B (en) | 2020-01-19 | 2020-01-19 | Fatigue damage model test platform and method for connecting bolt of fabricated lining segment |
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| CN202010061296.3A CN111220368B (en) | 2020-01-19 | 2020-01-19 | Fatigue damage model test platform and method for connecting bolt of fabricated lining segment |
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| CN111220368B CN111220368B (en) | 2021-01-22 |
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