Thoughts and suggestions on further tapping the transportation organization potential of Dazhou Station: Is there a great development potential in Dazhou, Sichuan?

After the completion of Xiang-Yu Railway, Dacheng Double Line and Yiwan Line, Dazhou Station has become an important inter-office interface of Chengdu Railway Bureau, undertaking a large number of freight train rendezvous tasks. In order to ensure the large entrance and smooth and orderly traffic, the difficulty of organization will be doubled. From my own perspective, the author puts forward some thoughts and suggestions on tapping the potential of station transportation organization for reference.

1. Basic driving equipment of Dazhou Station

Dazhou station belongs to a typical one-way one-level three-field mode. There are 8 passenger and cargo arrival and departure lines in the East Station, including 5 passenger cars and 3 freight trains, namely D Ⅰ, D Ⅱ and D8. This function is mainly used to send and receive long-distance through trains. In the middle is a marshalling station with 16 shunting line, which can be used for hump and tail shunting operations. Xitian has 15 freight train arrival and departure lines, of which X 1-X6 line is used for receiving and dispatching freight cars that need to be dismantled; X7, X8 and X9 lines are special lines for freight trains in Dazhou Iron and Steel Plant, especially X8 and X9 lines, which are only 808 and 738 meters respectively, and can only be used as locomotive running lines, receiving and dispatching trains or freight trains on Dawan Line. The X 10-X 15 line is mainly used for receiving and dispatching long-distance through trains.

2. Analysis of the current situation of receiving and dispatching trains at Dazhou Station

In 20 10, Dazhou Station received 38.8 freight trains and handed over 38.2 freight trains every day, which was completely different from the daily delivery of 12.3 trains in 2009. This remarkable growth, in addition to the capacity growth brought by the change from single-track to double-track and block mode, the organization of the station is also very important. A careful analysis of the current situation and characteristics of receiving and dispatching trains at Dazhou Station will help to further explore the receiving and dispatching capacity of Dazhou Station.

Analyzing the current situation of receiving and dispatching trains, there are the following positive factors.

2. 1 Long-distance through train is better.

Randomly selected, taking the handover in August of 20 10 as an example, Dazhou port connects with the long-distance through freight train 63 1, accounting for 52.4% of all connected trucks; 787 long-distance through freight trains were handed over, accounting for 66.4% of all the trucks handed over. Then, the parking time data of 30 long-distance through trains are randomly selected for analysis. The shortest train 1090 1 arrives at Dongchang D8 line, 16: 3 1 departs, and only stops 10 minutes, which is roughly equivalent to the stop time of ordinary passenger trains. There are 25 trains with stop time less than 30 minutes, accounting for 41.7%; There are 24 trains with stop time of 30-60 minutes, accounting for 40%; Due to the lack of rest time for the following drivers and receiving and dispatching buses, there are 11trains that stop more than1hour, accounting for 18.3%. The total stop time of 60 long-distance through trains at Dazhou Station is 2256 minutes, with an average stop time of 37.6 minutes (0.63 hours), which is much lower than the average stop time of 3.5 hours in the same period in 2009. It is precisely because of the opening of a considerable number of long-distance through trains that the efficiency of Dazhou station's arrival and departure lines has been improved, and a large number of freight trains have been picked up.

2.2 train diagram adjustment, which provides conditions for the big entrance.

Since 2009, the Ministry of Railways and the Railway Bureau have made many adjustments to the train diagram, especially after the opening of Xiangpu Railway, Dacheng Double Line and Yiwan Line. It should be said that the capacity of Dazhou Port has been further released. In order to ensure the realization of "big entrance and big exit", the Ministry of Railways has adjusted and optimized the operation diagram, and the traffic flow has been fully guaranteed. For example, some traffic on the original Baocheng line has also been diverted into and out of Dazhou, and the daily average number of oral sex vehicles in Dazhou has increased rapidly from 10 to about 40. By the end of 20 10, the daily average number of oral sex vehicles has reached 46.

2.3 The arrival and departure lines are used reasonably.

After nearly a year's familiarity, running-in and exploration, station attendant in the operation workshop and the station dispatcher have better grasped the characteristics of the new station equipment and the law of car flow connection, explored an operation mode that is more conducive to production organization, and the use of station equipment, especially the arrival and departure lines, tends to be more rational. Xiachang through train connects Dongchang D Ⅰ, D Ⅱ and D8; The freight cars that need to be edited are connected to the X 1-X7 line in the west field; The through train at the Shanghai-Changzhou interchange connects Xitian line X 10-X 15. As the attendant, the station dispatching, dispatching and unpacking trains are basically designed according to the arrival and departure lines of Dazhou Station, and the arrival and departure lines are used reasonably, in parallel and in a balanced way, which largely avoids the mutual interference between the arrival and departure of uplink and downlink trains.

At the same time, there are also the following problems in receiving and dispatching trains at Dazhou Port.

2.3. 1 Insufficient flow restricts further delivery.

At present, although we put in about 46 trains every day, according to the daily traffic balance of Dazhou Station at 18: 00, there are basically no full trains in Dazhou Station except the upstream section and the pick-up train that arrives after 16: 30. In other words, it's not that Dazhou Station can't hand over more freight trains to Xi 'an Safety Bureau, but there is simply not enough upstream traffic to assemble and hand over.

2.3.2 Unbalanced traffic flow connection

The arrival and departure time of the uplink trains connecting Chengdu North and Chongqing West at Dazhou Station is unbalanced, which is basically concentrated in the daily11:00-17: 00, and there is less arrival and departure traffic at night. Therefore, there are usually 12- 15 trains at Dazhou port during the period from18: 00 to 6: 00 the next morning, accounting for a little more than 30% of the total number of the whole day. In fact, the night shift at Dazhou Station has enough time and ability to hand over the upward train. The current situation is that it takes only three hours from 15:00 to 18: 00 every day, and Dazhou Port needs to hand over the 12- 14 train, which is more than14 of the total number of trains in the whole day. The pressure of receiving and dispatching trains is great, and the throat ability is very tight. In case of abnormal conditions such as equipment failure, it will cause large-scale delay and cause a large number of. In short, due to the uneven arrival time of the train, the mouth of Dazhou has become more idle at night and busy during the day.

2.3.3 The marshalling quality of connecting trains needs to be improved.

Except for the long-distance through train, the quality of the trains connected to Dazhou Station is not high, and the trains do not run completely according to the train formation plan of the Railway Bureau. There are violations of train formation in the uplink and downlink, which brings difficulties to the station transportation organization. Taking August of 20 10 as an example, there were 79 illegally arranged trains in Dazhou port, and the daily average number of illegally arranged trains exceeded 3.5, which had a great impact on the production organization of the station and brought difficulties to the completion of the daily average delivery task.

2.3.4 Transformation and upgrading, but due to the influence of objective factors such as geographical conditions, it is unrealistic to upgrade Dazhou Station on a large scale.

However, the author believes that some changes in some places will not affect the normal use and safety of equipment, but can receive good results. Obviously, if the first route signal SLD3 of the west station of our station is set too far, the waiting time of the freight train will be prolonged, and the problem can be solved by moving the signal to the station for a certain distance. For another example, the effective length of the waiting line of two locomotives in the west field is not enough, so it is impossible to put two locomotives at the same time (reconnection), which affects the work efficiency.

3. Some suggestions

Dazhou Railway Station, as one of the most important inter-office interfaces of Chengdu Railway Bureau, is bound to undertake more train handover tasks and play a greater role. In order to further improve the transportation organization ability under the existing equipment conditions, the author thinks that the following adjustments can be made.

3. 1 compress the traffic handover at Guangyuan intersection, and increase the upstream traffic flow at the intersection of Chengdu North and Chongqing West to Dazhou.

In particular, in order to strengthen the operation of the through train in Dazhou Port, we can further increase the cargo handover logarithm of Dazhou Port on the basis of basically not affecting the use of the arrival and departure lines of Dazhou Station.

3.2 Balance the arrival of upward trains and increase the arrival of trucks at night.

Through analysis, the night routing capacity of Dazhou Station can be increased from 10 to 15 on the existing basis. Increasing the intensity of truck arrival at night can not only balance the train running density and relieve the pressure of day shift delivery, but also relieve the pressure of day shift work, especially that of station attendant and signalman, which is beneficial to safety production.

3.3 Move the first route signal SLD3 of Westfield uplink to the station for 500-700 meters.

The length of the D3G section of the Westfield Upbound Line is close to 1000m, and the actual running speed of the locomotive heading for Ankang in this section is basically maintained at about 25km/h, with an average running speed of less than 7m/ s, so that we have to wait for the preceding train to travel in the Westfield for nearly 10 minutes before turning on the departure signal of the second train after crossing the SLD3 signal. Moving the SLD3 signal to our station for 500-700 meters will save the waiting time of 70- 100 seconds, which will greatly improve the start-up ability of intensive running futures cars.

3.4 Extend the effective waiting line length of the west yard of Dazhou Station to ensure that it can accommodate the reconnected vehicles.

Extending the effective length of the waiting line to accommodate the reconnected trains is helpful to save the time of train head changing and the use time of arrival and departure lines, further reduce the time of trains staying at the station and improve the efficiency of transportation organization.

3.5 Arrive at the newly-built Dazhou Station before the peak.

From the station plan, Dazhou Station has three rows of stations. However, according to the current utilization situation, the east station of Dazhou Railway Station can only meet the growing demand for receiving and dispatching passenger trains. Compared with the sending and receiving of trucks, Dazhou station has become a first-class two yards. After the newly-built Dazhou Station arrives before the peak, all the trains that need to be released will arrive at the peak, which will greatly alleviate the receiving and dispatching pressure in the western market, greatly save the time for releasing trains to push the peak, and greatly reduce the truck stop time (middle and stop time) in Dazhou Station. By then, the transportation and passing capacity of Dazhou Station will reach a new level. ■