CN111041911B - Method for testing resistance of steel bar of railway ballastless track bed - Google Patents
Method for testing resistance of steel bar of railway ballastless track bed Download PDFInfo
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- CN111041911B CN111041911B CN201911235768.6A CN201911235768A CN111041911B CN 111041911 B CN111041911 B CN 111041911B CN 201911235768 A CN201911235768 A CN 201911235768A CN 111041911 B CN111041911 B CN 111041911B
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- steel bar
- measuring
- ballastless track
- track bed
- bar frame
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B35/00—Applications of measuring apparatus or devices for track-building purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Machines For Laying And Maintaining Railways (AREA)
Abstract
The invention discloses a method for testing the resistance of reinforcing steel bars of a railway ballastless track bed, which comprises the steps of firstly, connecting upper and lower steel bar frames in the ballastless track bed board and vertical steel bars connecting the upper and lower steel bar frames by insulating clamps, horizontally penetrating measuring iron wires in the upper and lower steel bar frames respectively, enabling the measuring iron wires to be closely attached to all longitudinal steel bars in the layer respectively, and reserving measuring ends; two measuring end buttons of the direct current 500V megger are respectively connected with copper wires, wherein one measuring end button is connected with the probe, and the other measuring end button is connected with a measuring iron wire; and shaking the megger, and enabling a detector to respectively touch each transverse steel bar and each erection bar of the upper-layer or lower-layer steel bar rack to be detected with the probe, and recording the resistance value of the probe. The detection method is simple, is beneficial to field construction, saves time for the construction of the ballastless track bed plate, and improves the construction work efficiency of the ballastless track.
Description
Technical Field
The invention relates to a method for measuring resistance, in particular to a method for testing the resistance of a steel bar of a railway ballastless track bed.
Background
Along with the improvement of the life quality of people, the number of people and the quantity of goods and materials to be transported are increased continuously when people go out by taking the train, and the same railway line can only adopt a method of increasing the speed of the train and increasing the number of trains in order to meet the increased transportation requirements. The problem thus posed is that the service life of the railway line is reduced, the number of times the line needs to be repaired is increasing, but the time available for repair is becoming shorter and shorter.
With the continuous development of railway technology and the advent of new building materials, ballastless tracks are beginning to be applied to railway lines.
The ballastless track bed is a track structure which adopts integral foundations such as concrete, asphalt mixture and the like to replace a loose gravel track bed, and is an advanced track technology in the world today. Compared with a ballast track bed, the ballastless track bed avoids splashing of ballast when a train runs at a high speed, the smoothness and the stability of a track are good, the track is not easy to expand, the service life is long (the durability is good), the maintenance work is less, the maintenance cost is low, the speed of the train can reach more than 350 kilometers, and therefore more and more ballastless tracks are used in a newly-built railway line.
Because the reinforcing mesh in the ballastless track bed plate is close to the steel rail, an electromagnetic field generated by the signal current of the track circuit in the steel rail around the steel rail generates an induced current in a closed loop of the reinforcing mesh of the track bed plate, so that the resistance R of the steel rail of the primary parameter of the track circuit is increased, the inductance L of the steel rail is reduced, and the transmission distance of the track circuit is shortened. In order to improve the transmission performance of a track circuit, reduce a closed loop below the track, reduce the influence degree of a ballastless track on the transmission of the track circuit to the maximum extent, and prolong the transmission distance of the track circuit, insulation treatment of a longitudinal and transverse steel bar intersection point is required to be carried out, namely, insulation card connection is adopted between steel bars in a ballastless track bed plate. During track construction, before pouring the concrete of the track bed plate, whether the resistance between the reinforcing steel bars of the track bed plate meets the design requirement needs to be detected in order to ensure the effectiveness of insulation treatment. When the device is used for measuring, every two reinforcing steel bars are connected into a group for detection, because more reinforcing steel bars are arranged on each plate, the frequency of detecting the connected reinforcing steel bars is increased, the manpower and material resources required by detection are increased, the time is long, and the construction efficiency of the ballastless track is seriously influenced.
Disclosure of Invention
The invention aims to provide a method for testing the resistance of the reinforcing steel bar of the ballastless track bed of the railway, which is simple and efficient and is beneficial to field construction.
In order to achieve the purpose, the invention can adopt the following technical scheme:
the method for testing the resistance of the reinforcing steel bar of the railway ballastless track bed comprises the following specific steps:
firstly, according to design requirements, after an upper layer steel bar frame, a lower layer steel bar frame and frame steel bars connecting the upper layer steel bar frame and the lower layer steel bar frame in a ballastless track bed plate are connected well by insulation cards, measuring iron wires are horizontally arranged in the upper layer steel bar frame and the lower layer steel bar frame in a penetrating mode respectively, the measuring iron wires are enabled to be attached to all longitudinal steel bars in the layer in a close fit mode respectively, and measuring ends are reserved;
secondly, connecting copper wires to two measuring end buttons of the direct current 500V megger respectively, connecting one copper wire with a probe with an insulating handle, and connecting the other copper wire with a measuring end of a measuring iron wire;
and thirdly, a tester shakes the handle of the megger to a rated rotating speed slowly and gradually, another tester holds the insulated handle by hand, the probe is respectively touched to each transverse steel bar and each erection steel bar of the upper-layer steel bar frame or the lower-layer steel bar frame to be tested, and the resistance value of the probe is recorded.
And re-binding or replacing the detected insulation cards on the steel bars with the resistance values smaller than the designed value, and then testing again to ensure that the connection of all the steel bars meets the design requirements.
When the measuring iron wire is penetrated, the measuring iron wire sequentially passes through and is tensioned from the upper part and the lower part of the adjacent longitudinal steel bar in a staggered manner.
The method has the advantages of being simple, beneficial to field construction, saving time for the construction of the ballastless track bed plate and improving the construction efficiency of the ballastless track. When the method is adopted for detection, all longitudinal steel bars of each layer of the steel bar frame are connected in parallel by using one measuring iron wire, and the resistance condition between each transverse steel bar and each vertical steel bar and the longitudinal steel bars can be detected by one-time connection, so that the original one-time detection of each longitudinal steel bar and each transverse steel bar and each vertical steel bar respectively in a grading way is avoided, the time for detecting the resistance between the steel bars is saved, the method and the steps for on-site detection are standardized, the construction quality of the railway ballastless track bed is greatly improved, the construction period is shortened, and the waste of manpower and material resources is reduced.
Drawings
Fig. 1 is a layout diagram of reinforcing steel bars of a railway ballastless track bed.
Fig. 2 is a top view of the upper layer of rebar of fig. 1.
Fig. 3 is a top view of the lower layer of rebar of fig. 1.
Fig. 4 is a view showing the position between the measuring iron wire and the longitudinal reinforcing bar in fig. 2 or 3.
Detailed Description
The method of the present invention will be described in more detail below by taking the example of measuring the resistance of the steel bar in a slab (6.00 m in length) ballastless track bed, so as to facilitate the understanding of those skilled in the art.
The method for testing the resistance of the reinforcing steel bar of the railway ballastless track bed comprises the following specific steps:
firstly, according to design requirements, connecting an upper-layer steel bar frame 1 (phi 16 steel bars), a lower-layer steel bar frame 2 (phi 14 steel bars) and frame vertical bars 3 (phi 10 steel bars) connecting the upper-layer steel bar frame 1 and the lower-layer steel bar frame 2 in a ballastless track bed board by using insulation cards, implanting the steel bars into a tunnel backfill layer (the implantation depth is 150 mm) through the phi 16 steel bars, and implanting the track bed steel bars into the backfill layer as shown in fig. 1; fig. 2 is a top (plan) view of the upper layer of reinforcement 1, and fig. 3 is a top (plan) view of the lower layer of reinforcement 2;
selecting an iron wire with the diameter of phi 1.6 as a measuring iron wire 4 (under normal conditions, the thicker the diameter of the measuring iron wire is, the better the diameter of the measuring iron wire is), fixing one end of the measuring iron wire 4 on the leftmost longitudinal steel bar 1.1 when measuring the upper-layer steel bar frame 1, and then sequentially passing the measuring steel wire 4 through all the longitudinal steel bars in a vertically staggered manner (as shown in fig. 4) and tensioning to ensure that the measuring iron wire 4 is closely attached to all the longitudinal steel bars and the contact is good;
secondly, a direct current 500V rocking meter is used as a measuring tool, one measuring terminal button of the rocking meter 5 is connected with a copper wire with the length of three meters (yellow insulating rubber is wrapped around the copper wire), the copper wire is connected with a measuring terminal of a measuring iron wire 4, the other measuring terminal button is connected with a copper wire with the length of seven meters (green insulating rubber is wrapped around the copper wire), and the copper wire is connected with a probe 6 with an insulating handle, as shown in fig. 2;
thirdly, during measurement, a detector shakes the handle of the megger slowly and rapidly to a rated rotating speed (120 r/min), another detector holds the insulated handle, the probe 6 is respectively contacted with each transverse steel bar and the erection steel bar of the upper steel bar, the resistance value of each measured steel bar is recorded, whether the connection between the steel bars meets the design requirement or not is judged according to the resistance, the insulation cards on the steel bars with the detected resistance less than 2 megaohms are recoiled after the measurement is finished, if the insulation cards are damaged, all the insulation cards are replaced, the resistance between the upper steel bar frame 1 and the erection steel bar 3 and each longitudinal steel bar after the connection is well, namely, the connection of all the steel bars meets the design requirement;
and fourthly, measuring the resistance value of each transverse steel bar, each vertical steel bar and each transverse steel bar in the lower steel bar frame 2 according to the same method.
According to the steps, whether the connection of the steel bars in the ballastless track beds of other plates meets the design requirements can be detected.
Claims (2)
1. A method for testing the resistance of a steel bar of a railway ballastless track bed is characterized by comprising the following steps: comprises the following steps:
firstly, according to design requirements, after an upper layer steel bar frame, a lower layer steel bar frame and a frame steel bar connecting the upper layer steel bar frame and the lower layer steel bar frame in a ballastless track bed plate are connected well by insulation clamps, measuring iron wires are horizontally arranged in the upper layer steel bar frame and the lower layer steel bar frame respectively in a penetrating mode, when the measuring iron wires are arranged in the penetrating mode, the measuring iron wires sequentially penetrate through the upper portion and the lower portion of adjacent longitudinal steel bars in a staggered mode and are tensioned, the measuring iron wires are enabled to be respectively attached to all the longitudinal steel bars in the layer in a close fit mode, and measuring ends are reserved;
secondly, connecting copper wires to two measuring end buttons of the direct current 500V megger respectively, connecting one copper wire with a probe with an insulating handle, and connecting the other copper wire with a measuring end of a measuring iron wire;
and thirdly, a tester shakes the handle of the megger to a rated rotating speed slowly and gradually, another tester holds the insulated handle by hand, the probe is respectively touched to each transverse steel bar and each erection steel bar of the upper-layer steel bar frame or the lower-layer steel bar frame to be tested, and the resistance value of the probe is recorded.
2. The method for testing the resistance of the steel bar of the railway ballastless track bed according to claim 1, wherein the method comprises the following steps: and re-binding or replacing the detected insulation cards on the steel bars with the resistance values smaller than the designed value, and then testing again to ensure that the connection of all the steel bars meets the design requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911235768.6A CN111041911B (en) | 2019-12-05 | 2019-12-05 | Method for testing resistance of steel bar of railway ballastless track bed |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911235768.6A CN111041911B (en) | 2019-12-05 | 2019-12-05 | Method for testing resistance of steel bar of railway ballastless track bed |
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| CN111041911A CN111041911A (en) | 2020-04-21 |
| CN111041911B true CN111041911B (en) | 2021-11-16 |
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| CN116027160B (en) * | 2023-02-24 | 2023-06-13 | 中交第一航务工程局有限公司 | Track plate insulation detection device and method |
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| CN111041911A (en) | 2020-04-21 |
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