Raskaan ja nopean junaliikenteen monitorointiasema: Esisuunnitteluvaihe

Tutkimustuotos: Tutkimusraportti

Abstrakti

This report examines the establishment of a monitoring station for heavy and fast railway traffic. A clear need for measurements like this has been identified to better understand the operation of track structures and the track's impact on its environment. The axle weights and speeds of the trains have been and are being increased all the time. In addition, there will be a new type of rolling stock on the track. This already increases the need to understand the stresses in structure caused by different trains.

In the pre-planning phase, monitoring stations outside of Finland were examined and it was found that there were no examples of monitoring stations on a similar scale from around the world. The measurements have mainly focused on a certain part of the track and have lasted a short time. The closest example can be found on the Malmbanen track in Sweden, where the loads on the superstructure are mainly examined. More information can be found in the literature about different measurement solutions for individual problems.

During the planning process, it was concluded that at least two monitoring stations are needed: one for a soft and one for a hard subsoil. Hard subsoil sites are easy to find, but soft subsoil sites on a sufficiently fast and heavy-traffic track section were more difficult. The proximity of the wheel force detector was also a boundary condition, as it can be used to reduce instrumentation, which lowers construction costs. Based on the reviews, it was concluded that the stations will probably be placed on the Kouvola–Luumäki track section. The annual traffic volume is one of the largest in Finland and the traffic is heavy and also fast on that track section. The wheel force detector can also be found on this track section. To make the building process of monitoring stations possible, the goal was to find a section of track where other construction projects are being carried out anyway. This condition is also fulfilled on the Kouvola–Luumäki track section, because in 2024 the superstructure is going to be replaced on that track section. Tentatively, the monitoring station for the soft subsoil will be placed at kilometre 202 and for the hard subsoil at 204. The exact locations will be confirmed after the ground surveys.

Based on the preliminary design, an example cross-section of instrumentation was prepared. The plan is that each site has two parallel cross-sections every few meters to gain more reliability in the measurements. Initially, the design considered three cross-sections per site, but this would likely be impossible to implement during the available traffic stop. Slightly different instrumentation was planned for soft and hard subsoil, the biggest difference is that no pore pressure sensors are installed on the hard subsoil. The most expensive type of sensors is earth pressure sensors, but on the other hand, they are also the most important for understanding the load effects on the structure.

The management of the data produced by the monitoring stations has already
been identified as one of the most important issues of the project in the pre-planning phase. Based on the initial data, with a high frequency measurement, the passing of one train already generates several megabytes of data. In this case, it is necessary to create an automatic analysis that calculates the most important quantities, for example the peak and statistical values of the forces. The original data can be kept for a limited period of time to establish the possibility to analyse,for example, the properties of a train producing exceptional forces. The measurement data is intended to be used in several ongoing and future research projects.Preparing the cost estimate for the monitoring stations has been challenging, as the prices of sensors and data acquisition systems have changed rapidly in recent years and several products have had significant availability problems. The estimated cost of building two monitoring stations is around 650,000 euros.
Julkaisun otsikon käännösHeavy and fast railway traffic monitoring station: Pre-planning phase
AlkuperäiskieliSuomi
Sivumäärä46
Vuosikerta02/2024
ISBN (elektroninen)978-952-405-108-8
TilaJulkaistu - helmik. 2024
OKM-julkaisutyyppiD4 Julkaistu kehittämis- tai tutkimusraportti taikka -selvitys

Julkaisusarja

NimiVäyläviraston julkaisuja
ISSN (elektroninen)2490-0745

Sormenjälki

Sukella tutkimusaiheisiin 'Raskaan ja nopean junaliikenteen monitorointiasema: Esisuunnitteluvaihe'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.

Siteeraa tätä