CN112946366A - Method for testing insulating property of ballast bed block containing modified polyurethane material of urban rail - Google Patents
Method for testing insulating property of ballast bed block containing modified polyurethane material of urban rail Download PDFInfo
- Publication number
- CN112946366A CN112946366A CN202110333354.8A CN202110333354A CN112946366A CN 112946366 A CN112946366 A CN 112946366A CN 202110333354 A CN202110333354 A CN 202110333354A CN 112946366 A CN112946366 A CN 112946366A
- Authority
- CN
- China
- Prior art keywords
- track
- modified polyurethane
- plate
- ballast bed
- bed block
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- G01R27/08—Measuring resistance by measuring both voltage and current
-
- 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
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Machines For Laying And Maintaining Railways (AREA)
Abstract
The invention discloses a method for testing the insulating property of a track bed block containing a modified polyurethane material of an urban track, which comprises a track plate containing the modified polyurethane isolating material and a customized track bed base, wherein the track plate containing the modified polyurethane isolating material is laid on the track bed base, then the track plate is connected in series with a circuit containing an external direct-current voltage source and an ammeter for electrifying, the ammeter is used for measuring and calculating the circuit current, and the ohm law is used for calculating and obtaining the insulating volume resistance of the track bed block, so that the insulating property test of the track bed block is realized.
Description
Technical Field
The invention relates to the field of urban rails, in particular to a method for testing the insulating property of a ballast bed block containing a modified polyurethane material of an urban rail.
Background
Along with the increase of the operation age of the subway, a place with insulation damage can be generated between the steel rail and the track bed, so that part of the steel rail current is leaked to the underground through the concrete track bed to become stray current. Stray current can produce electrochemical corrosion to tunnel steel bar structure and buried metallic conduit, and long-time corruption can cause the steel bar structure fracture, buries ground metallic conduit and perforates, has serious potential safety hazard. Meanwhile, stray current can also cause interference to communication lines and equipment buried underground, and normal production and life can be influenced in serious cases.
The protection of stray current usually adopts the principle of 'mainly using blockage, secondarily using discharge, preventing and discharging combination and strengthening monitoring'. The 'blockage-oriented' is used for isolating and controlling all possible stray current leakage paths and reducing the stray current from entering the main structure, equipment and related facilities of the subway. "stifled" is as the most main safeguard measure, and wherein the ballast bed piece is also the important way of keeping apart stray current, improves the insulating nature of ballast bed piece, can effectively reduce stray current's leakage. The relevant measures include: the concrete resistivity is increased, a material having high insulation is used for the intermediate isolation layer, and the tunnel environment is kept dry.
At present, no method and index for evaluating the insulativity of the track bed blocks exist, the track slab adopts a factory prefabrication mode, the base adopts a cast-in-place mode, and the insulativity of the track bed blocks cannot be detected in an on-site construction environment, so that a base consistent with an on-site construction process needs to be prefabricated at a track slab prefabrication factory, the bottom surface of the track slab is made of an isolation material containing modified polyurethane, the track slab is flatly paved on the base, and the insulativity of each track slab containing the modified polyurethane isolation material is detected.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the method for testing the insulating property of the track bed block containing the modified polyurethane material of the urban rail, which can detect the insulating property of the track bed block, quantitatively evaluate the insulating property of the track bed block, make up the blank of detecting and evaluating the insulating property of the track bed block, improve the insulating property of the track bed block and effectively prevent the leakage of stray current.
In order to solve the technical problems, the invention provides the following technical scheme: the method for testing the insulating property of the ballast bed block containing the modified polyurethane material of the urban rail comprises the steps of paving the rail plate containing the modified polyurethane isolating material on the ballast bed base and customizing the ballast bed base, connecting the rail plate in series to a circuit containing an external direct-current voltage source and an ammeter for electrifying, measuring and calculating the current of the circuit by using the ammeter, calculating and obtaining the insulating volume resistance of the ballast bed block by using the ohm law, and realizing the test of the insulating property of the ballast bed block.
The method for testing the insulating property of the ballast bed block containing the modified polyurethane material of the urban rail specifically comprises the following steps:
(1) placing a first electrode plate at the bottom of the customized ballast bed base, placing a track plate containing the modified polyurethane isolation material on the first electrode plate, and placing a second electrode plate at the top of the track plate and in contact with the track plate;
(2) arranging an external direct-current voltage source on one side of the ballast bed base, electrically connecting the positive electrode and the negative electrode of the external direct-current voltage source with the first electrode plate and the second electrode plate sequentially through leads to form a series circuit, and connecting an ammeter on the series circuit;
(3) starting an external direct current power supply, acquiring electrifying current data for a plurality of times through a current meter after electrifying the series circuit by applying direct current voltage for a first set time, and continuously acquiring a second set time;
(4) and uploading all the electrifying current data acquired in the second set time interval to an upper computer, calculating the ratio of the detection voltage to the loop current measured each time as the insulation volume resistance of the track bed block by using ohm's law, and calculating the average value of the insulation volume resistance in the second set time interval so as to obtain a determined data value representing the insulation performance of the track bed block containing the modified polyurethane isolation material.
As a preferred technical scheme of the invention, the construction process of the ballast bed base is consistent with that of an urban rail construction site, and the ballast bed base is provided with a limiting groove for fixing the rail plate.
As a preferable technical scheme of the invention, the thickness of the first electrode plate and the second electrode plate is 3mm, and the length of the first electrode plate and the length of the second electrode plate are both longer than 5mm of the ballast bed.
As a preferred technical scheme of the invention, a lower plate limiting boss is fixedly arranged at the bottom of the track plate and used for fixing the track plate in the limiting groove.
Compared with the prior art, the invention can achieve the following beneficial effects:
1. the invention can quantitatively evaluate the insulating property of the ballast bed block containing the modified polyurethane isolating material, and the insulation volume resistance calculated by detection data represents the insulating property of the ballast bed block, so that whether the construction process of the ballast bed block is qualified or not can be judged.
2. The method can realize the detection of the insulating property of the ballast bed block containing the modified polyurethane isolation material of the urban rail, solve the problem that the insulating property of the ballast bed block cannot be detected on a construction site due to the large volume of the ballast bed block, and make up the blank that the insulating property of the ballast bed block cannot be detected.
3. The invention can effectively improve the insulating property of the ballast bed block containing the modified polyurethane isolation material of the urban rail and reduce the leakage of stray current.
Drawings
FIG. 1 is a schematic structural diagram of a method for testing the insulation performance of a ballast bed block of an urban railway containing a modified polyurethane isolation material.
Wherein: 1. a track plate; 2. a ballast bed base; 3. an ammeter; 4. an external direct current voltage source; 5. a first electrode sheet; 6. and a second electrode sheet.
Detailed Description
The present invention will be further described with reference to specific embodiments for the purpose of facilitating an understanding of technical means, characteristics of creation, objectives and functions realized by the present invention, but the following embodiments are only preferred embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1:
as shown in figure 1, the invention provides a method for testing the insulating property of a track bed block containing a modified polyurethane material of an urban track, which comprises a track plate 1 containing the modified polyurethane isolation material and a customized track bed base 2, placing the track plate 1 containing the modified polyurethane isolation material prefabricated in a factory on the customized track bed base and testing the track bed base 2, the construction process of the roadbed base 2 is consistent with that of an urban rail engineering site, after the track slab 1 is laid on the roadbed base 2, then the track plate 1 is connected in series with a circuit containing an external DC voltage source 4 and an ammeter 3 for electrifying, the voltage of the external DC voltage source 4 is 1000V, the measuring range of the ammeter 3 is 0-0.1A, the ammeter 3 is used for measuring and calculating the circuit current, and the ohmic law is utilized to calculate and obtain the resistance value of the insulation volume, so as to realize the insulation performance test of the track bed block.
In this embodiment, the method for testing the insulating property of the ballast bed block of the urban rail containing the modified polyurethane material specifically comprises the following steps:
(1) placing a first electrode plate 6 at the bottom of a customized ballast bed base, placing a track plate 1 containing a modified polyurethane isolation material on the first electrode plate, and placing a second electrode plate 5 at the top of the track plate 1 and in contact with the track plate 1;
(2) an external direct-current voltage source 4 is arranged on one side of the ballast bed base 2, the positive electrode and the negative electrode of the external direct-current voltage source 4 are electrically connected with a first electrode plate 6 and a second electrode plate 5 sequentially through leads to form a series circuit, and an ammeter 3 is connected to the series circuit;
(3) starting an external direct current power supply 4, electrifying for one minute by applying direct current voltage to the series circuit, then acquiring electrified current data once per second by using a current meter 3, and continuously acquiring for one minute;
(4) and uploading all the electrifying current data acquired within one minute to an upper computer, calculating the ratio of the detection voltage and the loop current measured each time as the insulation volume resistance of the track bed block by using ohm's law, calculating the average value of the insulation volume resistance within one minute, and acquiring a determined data value representing the insulation performance of the track bed block containing the modified polyurethane isolation material.
In this embodiment, the ballast bed base 2 is provided with a limiting groove for fixing the track slab 1.
In this embodiment, the thicknesses of the first electrode sheet 6 and the second electrode sheet 5 are 3mm, and the lengths of the first electrode sheet 6 and the second electrode sheet 5 are both longer than 5mm of the track bed.
In this embodiment, the bottom of the track slab 1 is fixedly provided with a lower-limiting boss, and the lower-limiting boss is used for fixing the track slab 1 in a limiting groove.
Example 2:
as shown in figure 1, the invention provides a method for testing the insulating property of a track bed block containing a modified polyurethane material of an urban track, which comprises a track plate 1 containing the modified polyurethane isolation material and a customized track bed base 2, placing the track plate 1 containing the modified polyurethane isolation material prefabricated in a factory on the customized track bed base and testing the track bed base 2, the construction process of the roadbed base 2 is consistent with that of an urban rail engineering site, after the track slab 1 is laid on the roadbed base 2, then the track plate 1 is connected in series with a circuit containing an external DC voltage source 4 and an ammeter 3 for electrifying, the voltage of the external DC voltage source 4 is 1000V, the measuring range of the ammeter 3 is 0-0.1A, the ammeter 3 is used for measuring and calculating the circuit current, and the ohmic law is utilized to calculate and obtain the resistance value of the insulation volume, so as to realize the insulation performance test of the track bed block.
In this embodiment, the method for testing the insulating property of the ballast bed block of the urban rail containing the modified polyurethane material specifically comprises the following steps:
(1) placing a first electrode plate 6 at the bottom of a customized ballast bed base, placing a track plate 1 containing a modified polyurethane isolation material on the first electrode plate, and placing a second electrode plate 5 at the top of the track plate 1 and in contact with the track plate 1;
(2) an external direct-current voltage source 4 is arranged on one side of the ballast bed base 2, the positive electrode and the negative electrode of the external direct-current voltage source 4 are electrically connected with a first electrode plate 6 and a second electrode plate 5 sequentially through leads to form a series circuit, and an ammeter 3 is connected to the series circuit;
(3) starting an external direct current power supply 4, electrifying for two minutes by applying direct current voltage to the series circuit, then acquiring electrifying current data twice per second by using a current meter 3, and continuously acquiring for one minute;
(4) and uploading all the electrifying current data acquired within one minute to an upper computer, calculating the ratio of the detection voltage to the loop current measured each time as the insulation volume resistance of the track slab 1 by using ohm's law, calculating the average value of the insulation volume resistance within one minute, and acquiring a determined data value representing the insulation performance of the track bed block containing the modified polyurethane isolation material.
In this embodiment, the ballast bed base 2 is provided with a limiting groove for fixing the track slab 1.
In this embodiment, the thicknesses of the first electrode sheet 6 and the second electrode sheet 5 are 3mm, and the lengths of the first electrode sheet 6 and the second electrode sheet 5 are both longer than 5mm of the track bed.
In this embodiment, the bottom of the track slab 1 is fixedly provided with a lower-limiting boss, and the lower-limiting boss is used for fixing the track slab 1 in a limiting groove.
Example 3:
as shown in figure 1, the invention provides a method for testing the insulating property of a track bed block containing a modified polyurethane material of an urban track, which comprises a track plate 1 containing the modified polyurethane isolation material and a customized track bed base 2, placing the track plate 1 containing the modified polyurethane isolation material prefabricated in a factory on the customized track bed base and testing the track bed base 2, the construction process of the roadbed base 2 is consistent with that of an urban rail engineering site, after the track slab 1 is laid on the roadbed base 2, then the track plate 1 is connected in series with a circuit containing an external DC voltage source 4 and an ammeter 3 for electrifying, the voltage of the external DC voltage source 4 is 1000V, the measuring range of the ammeter 3 is 0-0.1A, the ammeter 3 is used for measuring and calculating the circuit current, and the ohmic law is utilized to calculate and obtain the resistance value of the insulation volume, so as to realize the insulation performance test of the track bed block.
In this embodiment, the method for testing the insulating property of the ballast bed block of the urban rail containing the modified polyurethane material specifically comprises the following steps:
(1) placing a first electrode plate 6 at the bottom of a customized ballast bed base, placing a track plate 1 containing a modified polyurethane isolation material on the first electrode plate, and placing a second electrode plate 5 at the top of the track plate 1 and in contact with the track plate 1;
(2) an external direct-current voltage source 4 is arranged on one side of the ballast bed base 2, the positive electrode and the negative electrode of the external direct-current voltage source 4 are electrically connected with a first electrode plate 6 and a second electrode plate 5 sequentially through leads to form a series circuit, and an ammeter 3 is connected to the series circuit;
(3) starting an external direct current power supply 4, electrifying for one minute by applying direct current voltage to the series circuit, then acquiring electrifying current data twice per second by using a current meter 3, and continuously acquiring for two minutes;
(4) and uploading all the electrifying current data acquired within two minutes to an upper computer, calculating the ratio of the detected voltage to the loop current measured each time as the insulation volume resistance of the track slab 1 by using ohm's law, calculating the average value of the insulation volume resistance within two minutes, and obtaining a determined data value representing the insulation performance of the track bed block containing the modified polyurethane isolation material.
In this embodiment, the ballast bed base 2 is provided with a limiting groove for fixing the track slab 1.
In this embodiment, the thicknesses of the first electrode sheet 6 and the second electrode sheet 5 are 3mm, and the lengths of the first electrode sheet 6 and the second electrode sheet 5 are both longer than 5mm of the track bed.
In this embodiment, the bottom of the track slab 1 is fixedly provided with a lower-limiting boss, and the lower-limiting boss is used for fixing the track slab 1 in a limiting groove.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The method for testing the insulating property of the ballast bed block containing the modified polyurethane material of the urban rail is characterized by comprising the following steps of: the track bed block insulation performance test device comprises a track plate (1) containing a modified polyurethane isolation material and a customized track bed base (2), wherein the track plate (1) containing the modified polyurethane isolation material is laid on the track bed base (2), the track plate (1) is connected in series to a circuit containing an external direct current voltage source (4) and an ammeter (3) for electrifying, the ammeter (3) is used for measuring and calculating circuit current, and the ohm law is used for calculating and obtaining the insulation volume resistance of a track bed block, so that the track bed block insulation performance test is realized.
2. The method for testing the insulating property of the ballast bed block containing the modified polyurethane material of the urban rail according to claim 1, which is characterized by comprising the following steps:
(1) putting a first electrode plate (6) at the bottom of a customized ballast bed base, putting a track plate (1) containing a modified polyurethane isolation material on the first electrode plate, and putting a second electrode plate (5) at the top of the track plate (1) and contacting with the track plate (1);
(2) an external direct current voltage source (4) is arranged on one side of the ballast bed base (2), the positive electrode and the negative electrode of the external direct current voltage source (4) are electrically connected with a first electrode plate (6) and a second electrode plate (5) through leads in sequence to form a series circuit, and an ammeter (3) is connected to the series circuit;
(3) starting an external direct current power supply (4), carrying out acquisition on the electrified current data for a plurality of times through an ammeter (3) after the series circuit is electrified for a first set time by applying direct current voltage, and continuously acquiring a second set time;
(4) and uploading all the electrifying current data acquired in the second set time interval to an upper computer, calculating the ratio of the detection voltage to the loop current measured each time as the insulation volume resistance of the track bed block by using ohm's law, and calculating the average value of the insulation volume resistance in the second set time interval so as to obtain a determined data value representing the insulation performance of the track bed block containing the modified polyurethane isolation material.
3. The method for testing the insulating property of the ballast bed block containing the modified polyurethane material of the urban rail according to claim 1, wherein the method comprises the following steps: the construction process of the ballast bed base (2) is consistent with that of an urban rail construction site, and the ballast bed base (2) is provided with a limiting groove for fixing the rail plate (1).
4. The method for testing the insulating property of the ballast bed block containing the modified polyurethane material of the urban rail according to claim 2, wherein the method comprises the following steps: the thickness of the first electrode slice (6) and the second electrode slice (5) is 3mm, and the length of the first electrode slice (6) and the length of the second electrode slice (5) are both longer than 5mm of the ballast bed.
5. The method for testing the insulating property of the ballast bed block containing the modified polyurethane material of the urban rail according to claim 3, wherein the method comprises the following steps: the bottom of the track plate (1) is fixedly provided with a lower plate limiting boss which is used for fixing the track plate (1) in the limiting groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110333354.8A CN112946366A (en) | 2021-03-29 | 2021-03-29 | Method for testing insulating property of ballast bed block containing modified polyurethane material of urban rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110333354.8A CN112946366A (en) | 2021-03-29 | 2021-03-29 | Method for testing insulating property of ballast bed block containing modified polyurethane material of urban rail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112946366A true CN112946366A (en) | 2021-06-11 |
Family
ID=76227134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110333354.8A Pending CN112946366A (en) | 2021-03-29 | 2021-03-29 | Method for testing insulating property of ballast bed block containing modified polyurethane material of urban rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112946366A (en) |
-
2021
- 2021-03-29 CN CN202110333354.8A patent/CN112946366A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Livneh et al. | Quality assessment during road formation and foundation construction: Use of falling-weight deflectometer and light drop weight | |
| Cavalier et al. | Investigation and repair of reinforcement corrosion in a bridge deck. | |
| CN102879323A (en) | Experiment system for corrosion of stray currents in subway | |
| US11300497B2 (en) | System, electrode and method for evaluating a condition of steel reinforcements in concrete | |
| KR101207612B1 (en) | Testing cell for sensing of electric corrosion used galvanic sensor for sensingof electric corrosion of steel-concrete structure | |
| Bartholomew et al. | Vertical impedance measurements on concrete bridge decks for assessing susceptibility of reinforcing steel to corrosion | |
| CN112946366A (en) | Method for testing insulating property of ballast bed block containing modified polyurethane material of urban rail | |
| CN106018492A (en) | Method for detecting dampness of dirt on surface of insulator, and apparatus and system thereof | |
| CN112230040A (en) | Stray current evaluation method for calculating direct current traction power supply system | |
| CN111041911B (en) | Method for testing resistance of steel bar of railway ballastless track bed | |
| Bongiorno et al. | Track insulation verification and measurement | |
| CN208224153U (en) | Pavement crack monitoring device and road surface | |
| Vranešić et al. | Dynamic stray current measuring methods in urban areas | |
| CN111812381A (en) | System and method for testing stray current of subway | |
| CN213517304U (en) | Monitoring device for potential change of town gas pipeline | |
| CN214225265U (en) | Stray current testing system for subway | |
| Millard et al. | Novel method for linear polarisation resistance corrosion measurement | |
| RU2710901C1 (en) | Method for automatic remote monitoring of accumulation of residual deformations and vibrations of heat and moisture conditions of elements of road structures in real operating conditions | |
| Chen et al. | Full-scale accelerated pavement testing of texas mobile load simulator | |
| Vranešić et al. | Detrimental effect of stray current on rails and fastening systems in urban railway tracks | |
| So et al. | On-site measurements on corrosion rate of steel in reinforced concrete | |
| CN109060870B (en) | Device and method for monitoring early-stage freezing and icing of concrete | |
| Lee et al. | Detection and monitoring of cracks in asphalt pavement under Texas mobile load simulator testing | |
| CN110836922B (en) | Device for detecting working state of reference electrode and working method thereof | |
| CN110554238A (en) | Stray current prevention testing method for subway integral ballast bed construction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |