Since the small mileage of the fork does not move, we can use a ruler to measure the position of the new turnout.

Because the front of the new and old turnouts is the same, the difference between the 50-12 turnout and the 60-12 turnout is that the distance between the front and the center of the turnout is not equal, as long as we measure the center of the 60-12 turnout from the original turnout, and determine the position of the center of the new turnout.

Through the center of the turnout, we can also figure out where the new turnout is located.

In this way, the position of the new turnout on the small mileage side is located, and no other tools are used, and it can be measured directly with a ruler.

So how to locate the center of the No. 2 turnout on the large mileage side?

As I said before, on the drawings of Haocun Station, the mileage of the new turnout is there, but the mileage of the old turnout is not.

We can calculate the distance between the center of the small mileage No. 1 turnout and the large mileage No. 2 turnout, which is very simple, subtract the two miles, and the number obtained is the distance between the two turnout centers.

For the turnout of the No. 1 turnout, we have measured it, with the simplest method, we can directly use a ruler to measure the difference between the two turnout centers from the No. 1 turnout, directly to the large mileage side, is the distance of the No. 2 turnout.

This method is indeed feasible, the only disadvantage is that the error is very large, after all, this distance is about 1050 meters, even if you use a 50-meter ruler, the number of times is a lot, and the error accumulates, and it is possible to differ a few centimeters in the end.

According to the method of the engineering unit, we use the total station to punch this distance.

First of all, we set up a total station at the approximate center of the two turnouts, first hit the coordinates of the center of the No. 1 turnout, and then go to the large mileage side, on the same rail, select a similar position, and determine a coordinate.

In this way, in the Cartesian coordinate system, the X and Y of the two coordinates are known, and according to the quadrants of these two coordinates, we can add and subtract X and Y, and use the Pythagorean theorem to calculate the hypotenuse distance of the two coordinate points, which is the straight-line distance of these two coordinates.

The distance between the two points has been measured, and then according to the number of the subtraction of the center of the No. 1 turnout and the No. 2 turnout, and the relative comparison of the distance between the two coordinate points, the center of the No. 2 turnout can be measured.

In this way, even if the error is small, because the second point set by the total station is likely to be not far from the center of the No. 2 turnout, which reduces the error.

There are only two strands of the station, you can use this method to determine the position of the center of the fork, and the station of the multi-strand road is actually the same, and you can use this method to determine the position of the center of the fork.

As long as the center of a turnout is set at the throat on both sides, we will know the mileage of this turnout, and the position of other turnouts can not be determined according to the mileage?

If there is no leveling point, the turnout positioning of the station transformation can be done by relying on this method.

Of course, if there is a leveling point, it is more rapid to use the total station to put the heart directly.

Now the center of the two turnouts has been determined, and the distance between the front and rear turnouts can be determined as long as the distance is measured according to different types of turnouts.

It took Shucheng an hour, and with the help of Wu Peng, it took an hour to complete all the turnouts at Haocun Station.

After the turnout, what happens next?

Perhaps the technicians of the railway engineering units will not be unfamiliar with the word, with rails!

What is a matching track? Matching is domination, matching, pairing, rail is rail, which means matching rail.

Why do you need rails?

As I have just said, the renovation of Haocun Station must use 60kg/m new rails for the main line, and 50kg/m rails for the station line, but the 25-meter rail behind the turnout of the station line must use 50 new rails.

In the station renovation, the rails before and after the turnout are called protective rails, and new rails must be used for this part of the rails.

The actual situation on the site is that there are not only 60 rails, but also 50 rails, and even 43 rails on the main line.

You may ask, 60, 50, 43 rails, which are all different in height, how can they be connected together?

This one is very simple, where the 60 and 50 rails are connected, we generally use special-shaped splints.

Splints, also known as fishtail plates, should have noticed that there are gaps between the rails, and the connection between the two rails is something like a steel plate, and they are connected together with nuts.

This steel plate is the same thing, which is the fishtail plate.

The special-shaped splint is specially used between different rails, such as 50 rails and 60 rails, the special-shaped splints are on the 50 rail side, the width is matched with the 50 rails, and on the 60 rail side, it is matched with the 60 rail direction.

If we take out the special-shaped splint, we can see that the height of the splint is different, one side is wide and the other is narrow.

What Shucheng has to do now is to investigate how many rails there are on the main line, not 60 rails, and what their length is.

Through the on-site investigation, Shucheng found that in front of the turnout of the No. 1 turnout, there was a 25-meter standard rail, a 23.4-meter non-standard rail, and a 6.25-meter steel rail, all of which were 50 rails.

After the on-site investigation, Shucheng found that there were three 25-meter 50 steel rails and a 21.5-meter steel rail.

As for the side strand behind the No. 1 turnout, that is, the station line, the result of Shucheng's on-site investigation is that after the original No. 1 turnout, a 50 steel rail is followed, and then a special-shaped plywood, followed by 43 rails, and 43 rails have been in the future.

For the positive line, what we have to do is to replace the extremely existing 50 rails with 60 rails, and the rail matching is completed.

The standard length of domestic rails is 12.5m and 25.0m, of course, 6.25m is used in some places, and the high-speed rail in the future has 500 meters of rail, all of which are welded and transported to the site.

In addition to the standard rail, there is also a kind of steel rail called curve shortened rail, the length of the curve shortened rail is 40, 80, 120mm shorter than the 12.5m standard rail, and there are 3 shorter than the 25.0m standard rail 40, 80, 160mm.

In addition to the rails, we all call them non-standard, that is, non-standard rails.

The principle of rail matching is that you can use 25 meters, resolutely do not use 12.5 meters, can use long, resolutely do not use short, but also pay attention to a problem, such as 26 meters of rail, if you use a 25 meter rail, there is one meter left, which is not allowed, you must use a 12.5 meter standard rail, and then use a 13.5 meter non-standard rail to form a track.

For example, the length of the rail that needs to be changed before the No. 1 turnout is 54.65 meters, so before the No. 1 turnout, we can first use a 25-meter 60 steel rail as a protective rail, and after subtracting 25 meters, there are 29.65 meters left, so that if the 25-meter rail continues to be used, it is not suitable.

So you can use a 12.5-meter 60 rail, and finally a 17.15 60 rail, these three rails form the track before the No. 1 fork.

For how to get 17.15 meters of 60 rails, you can completely use a 25-meter rail to sawn and take 17.15 meters of them.

When the station is changed, the 25-meter and 12.5-meter rails remain unchanged, as for the 17.15-meter rail, it is not necessarily this number, he is likely to be long or short, after all, the rail also has thermal expansion and cold contraction according to the temperature.

In addition, the rail gap must be reserved between the rail and the rail, and this width is generally calculated by 8 mm.

For the rail matching of the straight strand after the No. 1 fork, you can still use the method of the rail matching before the No. 1 fork, after measuring the position of the No. 1 new fork, calculate the distance to the pole with 60 rails, and within this distance, match the rail of 60, so that the rail matching of the main line is completed.

The rail matching of the station line is a mode with the main line, but after the turnout of the 60-12 turnout, you can first match a 60 rail, and then on this 60 rail, connect a 12.5-meter 60-50 special-shaped rail.

The length of the special-shaped rail is 12.5 meters, the so-called 60-50 special-shaped rail, on this rail, connect the next end of the 50 rail, the width of the rail, and the same as the 50 rail, the length of the period, is only a few tens of centimeters, and the other parts are the same as the 60 rail.

After using the special-shaped rail, there is no need for out-of-phase splints, but where it is lapped with 60 rails, 60 fishtail splints must be used, and where it is lapped with 50 rails, 50 fishtail splints must be used.

After passing the guò60-50 special-shaped rail, we used a 12.5-meter 50-43 special-shaped rail to connect the 43 rails behind, and the rail matching of the side strands of the No. 1 turnout was completed.

Of course, according to the actual situation, in the direction of the side strand behind the No. 1 turnout, it can also be directly connected to the 12.5-meter 60-50 special-shaped rail, and then connected to the 50-43 special-shaped rail, and it is also possible to directly match the track in this way.

The rail distribution of all stations is the safety drawing requirements, what kind of rail should be replaced by the main line, so we can count the number of rails that are not this kind of rail, and we can start the track distribution from the front and back of the turnout, and the station line is the same.

Because the rails of the main line are all the same, there are no zài special-shaped rails, and the station line from 60 rails to 43 rails must be connected using special-shaped rails, just like an overrun.

It took Shu Cheng six days to investigate the scene of the three stations, and he drew the track distribution diagrams of the six throat areas of the three stations by hand.

This aspect of the track is only a matter of suey.

Because a week ago, he had made an appointment with Ren Changhong, and he would go to Taizhou tomorrow, Ren Changhong was back to the company for a meeting, as for Shucheng, the purpose of his trip to Taizhou was not for anything else, that is, to invite Ren Changhong and Cai Wu to have a meal.

It can be said that in their own lives, these two people have helped him a lot.

PS: There are a lot of things in the station transformation, I can't write it all at once, first write it to the rails, and then there are sleepers, insulated joints, signals, turnouts pre-paved, set up sleepers and stomping, there are a lot of things, when I mention it, write it a little bit, and then write about the technology like this, I'm afraid that non-engineering readers will not dare to read it.

Thank you again for your support. xh118