What does long and short chain mean in the rail industry?

There are "long chains" and "short chains" when the route station is longer than the actual mileage on the ground, which is called a short chain, and vice versa.

There are many reasons for chain breakage, but there are two main ones: one is caused by errors in calculation and measurement; The other is caused by objective reasons such as local realignment and segmented measurement.

The long and short chains on the railway are divided into field broken chains and internal broken chains, and the internal chain breaks are generated in the design stage, such as those that have been designed, and they need to be modified for some reason (such as the modification of the curve radius), and the broken chain must be set. If the method of disconnection is not adopted, all the documents that have been designed will have to be modified completely, which will be too much work. During construction, the construction will be carried out according to this, and then the mileage will be uniformly arranged when the construction is completed.

Sometimes the broken chain is not one and a half meters, and the actual length (excluding the broken chain) should be calculated when making the estimate. Field broken chain, single-track railway generally does not have this problem, double-track railway long and short chain is absolutely used, double-track mileage requirements up and down to be unified, parallel section up and down mileage is the same is very easy, but when it comes to double-line non-parallel section can not be unified, at this time generally based on one of the lines (we have been subject to the next line) its mileage has been extended, the mileage of the other line is measured from the beginning of the branch line until the time of the parallel line again and the mileage measured by the baseline mileage is not the same value, It may be long or short, if it is long, it will be set up with a long chain, and if it is short, it will be set with a short chain, but the setting of the long and short chain should avoid bridges, tunnels, and curves. It should be set according to the measured values in the field.

In my information, the longest chain on the site is more than two kilometers. There is no special sign to distinguish between the long and short chains on site, only the long chains with kilometer marks will add a letter after the number of the kilometer mark to distinguish them!

1. The long chain on the railway: it is the part where the stations overlap when the stations are not connected due to local realignment or segmentation measurement.

2. Short chain on the railway: it is the part of the station that is interrupted when the stations are not connected due to local realignment or segmentation measurement.

The concept of "chain" refers to the mileage station on the railway.

For example, when route A is measured, it starts to partially change its route at AK2+, and after a continuous mileage of the old route A and the new route B, the new route B coincides with the old route A at BK3+, where the old station is AK3+.

There are two piles on the straight segment after this coincident point: AK3+660 is equivalent to BK3+, and AK3+ is equivalent to BK3+440. The broken chain pile is at AK3+, and this broken chain is a short chain with a length of meters.

In the case of railways, a long chain on a railway is the part where the stations overlap when the stations are not connected due to local realignment or segment measurements.

In the case of railways, the short chain on the railway means that when the stations are not connected due to local realignment or segment measurement, etc., the part of the station that is interrupted.

The concept of "chain" refers to the mileage station on the railway.

For example, when route A is measured, it starts to partially change its route at AK2+, and after a continuous mileage of the old route A and the new route B, the new route B coincides with the old route A at BK3+, where the old station is AK3+.

There are two piles on the straight segment after this coincident point: AK3+660 is equivalent to BK3+, and AK3+ is equivalent to BK3+440. The broken chain pile is at AK3+, and this broken chain is a short chain with a length of meters.

The long chain on the railway refers to the local cause.

The part of the stations that overlap when the stations are not connected due to rerouting or segmented measurements.

The short chain on the railway refers to the part of the station that is interrupted when the stations are not connected due to local realignment or segment measurement.

An example of how to write the station is as follows: long chain: k3+110=k+ long chain m short chain: k3+157=k3+207 short chain 50m

Summary. Hello dear and happy to answer for you: What does "long and short chain" mean in the railway industry? The answer is: kiss The long and short chain on the railway means that when the stations are not connected due to local realignment or segment measurement, the parts of the stations overlap.

What does "long and short chain" mean in the rail industry?

Hello dear, it's a pleasure to answer your question: What does "long and short chain" mean in the railway industry? The answer is: kiss The long and short chain on the railway means that when the stations are not connected vertically due to local realignment or segmentation measurement, the parts of the pile leakage mold numbers overlap.

China Railway is a form of transportation in China, an important infrastructure of the country, a popular means of transportation, and is in the backbone of China's comprehensive transportation system. In order to complete the passenger and freight tasks of railway transportation and carry out driving operations, and ensure the safety of various operations, different closed and scattered lines should be built and set up. Railway lines are divided into main lines, station lines, section pipelines, Zhengyou branch lines and special purpose lines that connect the station and run through or extend straight into the station are the main lines.

The main line can be divided into the main line of the section and the main line in the station, the part connecting the station is the section main line, and the part that runs through or extends straight into the station is the main line in the station.

1. It is impossible to have only one survey team during the field survey of the long line, and the line must be segmented, and the connection of each section will not coincide with the mileage, there must be errors, and it is necessary to introduce broken chains. For example, the first team starts the survey from 0km, the second team starts the survey from 100km, and the 100km will not be very accurate, if the first team to the contact mileage is 100+, then a long chain will be generated.

2. After the end of the line in the field, the local optimization plan, if the line is long or short, the broken chain will be introduced, so that the mileage of the section that is not affected by the line change will not change.

3. Broken chainNo matter what kind of railway, there is a mileage difference, and there is a broken chain.