CN101046493B - Track slab insulation detection method - Google Patents

Abstract

The invention discloses a track plate insulation detection method, belonging to the technical field of insulation detection methods, comprising placing a track plate and a steel rail to be inspected at a set position, sealing one end of two steel rails with a galvanized stranded wire with a plug, connecting a lead terminal at the other end of the steel rail to a measuring instrument, measuring an inductance value L and a resistance value R between the lead terminals of the two rails, removing the steel rail from the track plate to be inspected, and placing it at a set position, keeping one end of the two steel rails sealed, and then measuring an inductance value L0 and a resistance value R0 between the lead terminals of the two rails, and a track plate that meets the conditions of (L-L0)/L0≤-3% and (R-R0)/R0≤+10% is qualified; the invention can conveniently and accurately detect whether the insulation performance of the track plate meets the technical requirements of the track circuit.

Description

Track slab insulation testing method

technical field

The invention relates to an insulation detection method, in particular to a track slab insulation detection method. the

Background technique

With the development of society, high-speed railway transportation has become the goal pursued by all countries in the world. In order to meet the high stability, high durability, and comfort requirements of high-speed railways, it is necessary to adopt and develop ballastless tracks with less maintenance. Since China's railway signal transmission is carried out through steel rails, the rails are installed on the track slab, and the track slab is laid on the line, the electromagnetic induction generated by the steel mesh inside the track slab will have a greater impact on the transmission signal of the rail. Therefore, in order not to affect the signal transmission of the rail , the track slab must have good insulation properties. the

Contents of the invention

The purpose of the present invention is to provide a method for detecting the insulation performance of track slabs. the

The technical solution of the present invention is: a track slab insulation detection method, which mainly has the following steps:

The first step is to place the track slab under inspection on a flat and solid ground, and place the two rails on the rail-bearing part of the track slab;

The second step is to pad the rail with insulating blocks so that the rail bottom is 40-50mm away from the rail bearing surface, and adjust the gauge to 1435±5mm;

The third step is to seal one end of the two rails with a galvanized stranded wire with a plug, and connect the terminal at the other end of the rail to the measuring instrument;

The fourth step is to use an AC bridge to measure the inductance L and resistance R between the lead-out terminals of the two rails. The test frequency is specified as f, and the measurement is at least three times, and the arithmetic mean value is taken as the measurement result;

Step 5: Move the rails out of the inspected track slab and place them on an insulating object so that the height of the rail bottom from the ground is the same as the height of the rail bottom from the ground before the rail shift, adjust the gauge to 1435±5mm, and keep the two rails One end of the seal;

Step 6: Use an AC bridge to measure the inductance L0 and resistance R0 between the lead-out terminals of the two rails. The test frequency is specified as f0. Measure at least three times, and take the arithmetic mean value as the measurement result;

The seventh step, calculate the test results

Calculate the track plate under inspection so that the relative deviation of rail inductance is (L-L0)/L0, calculate the track plate under inspection so that the relative deviation of AC resistance of the rail is (R-R0)/R0; satisfy (L-L0)/L0≤ -3%, (R-R0)/R0≤+10% condition of the track plate is qualified. the

The f and f0 are respectively 2000 Hz. the

The beneficial effect of the invention is that whether the insulation performance of the track plate meets the technical requirements of the track circuit is detected. the

Detailed ways

A track slab insulation detection method mainly contains the following steps:

The first step is to place the track slab under inspection on a flat and solid ground, and place the two rails on the rail-bearing part of the track slab;

The second step is to pad the rail with insulating blocks so that the rail bottom is 40-50mm away from the rail bearing surface, and adjust the gauge to 1435±5mm;

The third step is to seal one end of the two rails with a galvanized stranded wire with a plug, and connect the terminal at the other end of the rail to the measuring instrument;

The fourth step is to use an AC bridge to measure the inductance L and resistance R between the lead-out terminals of the two rails. The test frequency is specified as f is 2000Hz. Measure at least three times, and take the arithmetic mean value as the measurement result;

Step 5: Move the rails out of the inspected track slab and place them on an insulating object so that the height of the rail bottom from the ground is the same as the height of the rail bottom from the ground before the rail shift, adjust the gauge to 1435±5mm, and keep the two rails One end of the seal;

Step 6: Use an AC bridge to measure the inductance L0 and resistance R0 between the lead-out terminals of the two rails. The test frequency is specified as f0 is 2000Hz. Measure at least three times, and take the arithmetic mean value as the measurement result;

The seventh step, calculate the test results

Calculate the track plate under inspection so that the relative deviation of rail inductance is (L-L0)/L0, calculate the track plate under inspection so that the relative deviation of AC resistance of the rail is (R-R0)/R0; satisfy (L-L0)/L0≤ -3%, (R-R0)/R0≤+10% condition of the track plate is qualified. the

Claims (1)

1. track plate insulation detecting method is characterized in that: mainly contain following steps:

The first step, will be examined the track plate and placed on the smooth solid ground, two one steel rails will be placed on the support rail position of track plate;

Second goes on foot, with collets the rail pad is risen, and makes the flange of rail apart from support rail face 40-50mm, adjustment gauge to 1435 ± 5mm;

The 3rd goes on foot, connects with the end envelope of the zinc-plated twisted wire of being with chock plug with two one steel rails, and rail other end leading-out terminal is connected with measuring instrument;

The 4th the step, measure inductance value L and resistance value R between two rail leading-out terminals with alternating current bridge, it is 2000Hz that test frequency is defined as f, measures at least three times, getting arithmetic mean is measurement result;

The 5th step, rail shifted out examined the track plate, and place on the insulating bodies, make the flange of rail apart from the height on ground with move rail before the flange of rail identical apart from the height on ground, adjustment gauge to 1435 ± 5mm, the end envelope company that keeps two one steel rails;

The 6th the step, measure inductance value L0 and resistance value R0 between two rail leading-out terminals with alternating current bridge again, it is 2000Hz that test frequency is defined as f0, measures at least three times, getting arithmetic mean is measurement result;

The 7th step, calculating assay

The track plate is examined in calculating makes rail inductance relative deviation amount be (L-L0)/L0, and the track plate is examined in calculating makes rail AC resistance relative deviation amount be (R-R0)/R0; Satisfy (L-L0)/L0≤-3%, (R-R0)/the track plate of R0≤+ 10% condition is qualified.