Castinsitu ballastless tracks slab track are not adopted for high speeds and long distances. Available measurement results indicate the expected favourable structural behaviour and prove the low maintenance. The track on a railway nonus or railroad us, also known as the permanent way, is the structure consisting of the rails, fasteners, sleepers and ballast or slab track. Introduction to ballastless track edited free download as powerpoint presentation. Bridge engineers are frequently responsible, for example, for approval of the concrete track supporting layer and railway engineers, for approval of the track components. If eight trains per hour activate a braking force of 80 kn per rail at the same track section the addition temperature rise would be 25 k 2, i. High speeds and heavy loads of trains are usually accompanied with large vibrations in the traintrackground system, especially when train comparative analysis of ballastless track system design using analytical and numerical. Li key laboratory of road and traffic engineering of the ministry of education, tongji university, china abstract with the rapid development of the highspeed railway. It does not include any requirements for inspecting, maintaining, repairing and replacing ballastless track systems during operation. In general, railroad track is consists of rail, rail joint, railroad tie and non ballasted track, also called ballastless track, is the railway track. Ballasted track has higher noise level than nonballasted track.
Track stiffness plays an important role in design and construction stages of the railway track. Up to now most of the ballastless track systems, which have been built on ballastless track systems using discrete rail. It is necessary to take effective noise reduction measures. Fullscale fatigue test of unitplate ballastless track laid. The study analyzed the force conditions of the crts. Conventional track consists of two rails located at a fixed distance apart called gauge the gauge of a track is the distance between inner edges of the heads of rails in track, measured at 16mm below the top surface of the rail. The calculation methods and parameters concerning train load, thermal effect, and foundation deformation of highspeed railway ballastless track, together with the structural design methods are summarized. The rheda 2000 ballastless track was used for the first time in germany in 2000, as pilot project on the new rail line between erfurt and halle. Decisionmaking model for track system of highspeed rail lines diva. This mode of con struction accordingly satisfies all requirements for application in railway and urbantransit situations. This configuration guarantees safe and permanent positioning of the track. Design and layout of ballastless track systems using unbound base course layers b. The different systems have undergone extensive laboratory and field tests before implementation on grade, bridges and in tunnels.
Dosto es video me ballestless railway track k bare me bataya gya hai janane k liye video ko pura dekhiye achha lage to like kijiye share kijiye. Interacon between ballastless track and bridge structures on high speed lines d rhodes and m i baxter. Once the deformation of the ballastless track due to the changing. Comparative analysis of ballastless track system design using. Ballastless track of the type low vibration track in a turnout in the gotthard base tunnel s faido multifunction station. Preferably, the ballastless track system is a unit structure, different lines, such as a subgrade, a bridge, a tunnel and the like, have unit structures. Design and layout of ballastless track systems using unbound. However, connection between ballastless and ballasted railway tracks is unavoidable. Ballasted track and nonballasted track railway track. Pdf ballastless track for urban transit lines vinoth ayyasamy. Such a system is simple and can be rapidly extended, renewed, or dismantled. Lechner munich university of technology, munich, germany abstract up to now most of the ballastless track systems, which have been built on earthworks consist of a structure with a continuously reinforced concrete pavement crcp or an asphalt pavement.
This european standard is applicable to all railway applications up to 250 kn axle load. It enables trains to move by providing a dependable surface for their wheels to roll upon. General this chapter includes criteria and standards for the planning, design, construction, and maintenance as well as materials of caltrain trackwork. Pdf the quality evaluation of the ballastless track. These systems have been designed and engineered by patil group in collaboration with our inhouse research and development teams and collaboration with global partners.
Track ballast forms the trackbed upon which railroad ties sleepers are laid. Preferably, the ballastless track system is a unit structure, different lines, such as a. Generally, laying ballast under the railway sleepers to reduce the stress on the ground. Ballasted track versus ballastless track article pdf available in key engineering materials 660. The quality evaluation of the ballastless track construction in the area of bratislava tunnel no. This european standard defines the general requirements concerning the design of ballastless track systems. Their design characteristics as well as the various requirements for efficient use are thoroughly explained. The construction documents prepared for this project and the public approval provided, by no means coincided with indian requirements for planning of a.
Ballastless track of the type low vibration track in a turnout in the gotthard base tunnels faido multifunction station. Tracks where electric trains or electric trams run are equipped with an. Transition zone between ballastless and ballasted track. Pdf ballasted track versus ballastless track researchgate.
Ballastless slab track constructions offer an alternative solution due to the enormous reduction of maintenance work and the long service life with constant serviceability conditions audley and andrews, 20, esveld and markine, 2006. Numerical study of transition zone between ballasted and. For clarity it is often referred to as railway track british english and uic terminology or railroad track predominantly in the united states. There are two main components in castinsitu ballastless tracks i.
In the areas which have rich rain and poor drainage, there may be obvious water damage existed in the interlamination of ballastless track. Characteristics in ballastless tracks, the rails are rigidly fastened to a special. Estimation of rail axial force in highspeed railway. The railway companies in austria and germany use ballastless track systems for many years. The rail stress will be either compressive or tensile depending on the change in the. Instrument for investigating the rail of a ballastless track under longitudinal temperature force article pdf available in advances in mechanical engineering 87 july 2016 with 185 reads. Numerical study of transition zone between ballasted and ballastless railway track. Nov 26, 2007 furthermore, ballastless track systems must often be examined and approved by various and different public offices. Transition zones between ballasted and ballastless tracks.
In design and construction stages of the railway track, engineers try to avoid situations wherein track stiffness changes. Nevertheless, changing the track stiffness is inevitable, especially in the transition zone, where the slab track connects to a conventional ballasted track. Before the widespread use of highspeed rail ballastless track needs to be tested in real conditions at high speed and small axial load. As an example the slab from just south of st pancras ll to farringdon is over 30 years old now, showing its age in many places and is likely to need renewal at some point in the next few years. Our ballastless track system is a far more superior system than what is being used currently in india, with a very competitive price. Distribution characteristic of hydrodynamic pressure in the.
Generally, nonballasted track is made up of steel rail, railway. Ballastless track acciona construction, in anticipation of the sysetm surge of investment in rail infrastructure, and aware of the important role that the ballastless track will play in this surge, as well as of the obstacle to competitiveness caused by the use of commercial systems, has promoted the development of its own ballastless track system. The success of a ballastless track is primarily based on the following advantages it offers. Pdf instrument for investigating the rail of a ballastless. Aug 23, 2005 when the new high speed line nurembergingolstadt is opened for service in 2006, more than 800km of ballastless track will be in operation in germany. Turnouts and bridge configuration as the train speed increases, the viaduct railway with a ballastless track becomes an increasingly important factor in the safety and stability of railway operation, and the deformation requirements of ballastless track turnout structure become more and more stringent. Kolkata metro introduction ballast has been an integral part of railway track and an economical medium providing an elastic support to it for many years. Dynamic behaviour of highspeed railway bridges with. In this development a very important role played the superstructure of the railroad system, and this modernization process led to appearing of the ballastless track system approximately 60 years ago. Finally, some suggestions on the future work are provided. Ballastless track systems with concrete slabs are used more and more. This study examines in depth the various slab track systems eing used tothat are bday. Distribution characteristic of hydrodynamic pressure in. Railway continuous prestressed concrete bridge design in.
There are plenty of differences between ballasted track and nonballasted track, tgack as composition, construction, maintenance, cost, and so on. Ballastless track system on asphalt getrac a1 is a ballastless track system with direct support of the track panel on an asphalt supporting layer. Patil group is one of the first companies in india to bring in the worldclass ballastless track system for indian railways. Pdf analysis of a moving load on ballastless rail track. Any changes on railway or installation on the operating highspeed railway rail may affect safety, which is strictly limited by the railway department. Slab track railway design combines superior stability with an almost complete absence of deformation. A ballastless track or slab track is a type of railway track infrastructure in which the traditional. Practically ballastless track systems ensure its serviceability at a very low maintenance costs over many years. It is used to bear the load from the railroad ties, to facilitate drainage of water, and also to keep down vegetation that might interfere with the track structure. May 03, 2011 ballastless track systems do of course take an age to install compare to ballasted systems, and are an absolute bgger to replace. The damage is mainly caused by repeated hydraulic fracturing. Ballastless track design offers many advantages compared to its traditional counterpart. Smoother travel and longer life time of a track depend on the immutable track stiffness.
Advances in design theories of highspeed railway ballastless. It is found that some standing wave modes are linearly correlated with the rail axial force and thus can be considered as the basic indices for rail axial force. Doc comparison between ballasted track and ballastless. Tracks where electric trains or electric trams run are equipped with an electrification system such as an overhead electrical power line or an additional electrified rail. Pdf traditional track designs are now in a process of change due to higher axle loads and faster speeds of trains. Establishing of track quality level management system for ballastless track of highspeed railway j. Though the material is locally available, but ballasted track calls for frequent maintenance attention, and periodical screening. The article presents a comparison of two main types of track systems, including technical and economic aspects. In addition the demographic change of type sleepers ore d57 r1, 1966. The exploration and research of crts i slab ballastless track. Due to their experiences it is obvious that such systems show a lot of advantages compared to ballasted tracks.
All bsi british standards available online in electronic and print formats. Consistent and positive ballastless track systems global. A ballastless track or slab track is a type of railway track infrastructure in which the traditional elastic combination of tiessleepers and ballast is replaced by a rigid construction of concrete or asphalt. Specification based nonempirical ballastless track development. Slab track design lacks the necessity for underlying ballast because the rails are anchored directly to a concrete slab.
Ballestless track for urban metro products patil group. Jul 24, 2014 it can be concluded by the description above that the ballastless track system of the present invention is high in reliability, good in durability, and easy in construction and maintenance. Ro 032002 technische mitteilung zum oberbautechnischen regelwerk. Dec 24, 2018 in the areas which have rich rain and poor drainage, there may be obvious water damage existed in the interlamination of ballastless track. Ballastless track systems using discrete rail seats as well as systems with sleeper panels resting directly on an asphalt or concrete pavement or monolithically fixed, respectively, have been investigated according to their suitability for unbound base layers. Comparison of ballast and ballastless tracks master thesis. System acceptance method, failure mode analysis, rams, ballastless track development abstract for the development of ballastless track for the dutch highspeed line a nonempirical design method based on predefined specifications is made in accordance to european specifications on railway rams. Therefore, the main advantages of ballastless slab track can be concluded. Establishing of track quality level management system for. Ballastless tracks track rail transport rapid transit. Nonballasted track, also called ballastless track, is the railway track whose bed is composed of concrete and bituminous mixture, etc. The track on a railway nonus or railroad us, also known as the permanent way, is the structure consisting of the rails, fasteners, sleepers and ballast or slab track, plus the underlying subgrade. Nevertheless, changing the track stiffness is inevitable, especially in the transition. Ballasted track versus ballastless track scientific.
Track geometry for highspeed railways europakorridoren ab. Help about wikipedia community portal recent changes contact page. A ballastless track is expensive but is likely to require little or no maintenance during its lifetime. The application of slab tracn and embedded tracn technology in a railway. Comparison of ballast and ballastless tracks master thesis for the purpose of obtaining an academic degree of master of science at the technical university graz submitted by nina avramovic at institute for railway engineering and transport economy mentor. Interacon between ballastless track and bridge structures. The invention provides a ballastless track system, which comprises a base 16, a track slab 12, a pouring layer 14, a connecting piece, two rows of track bearing platforms 11, 11 and steel tracks 10, wherein the track slab 12 is arranged above the base 16. Advances in design theories of highspeed railway ballastless tracks. The term track or trackwork includes special trackwork and its interface with other components of the rail system. The technical concept of a railway track consisting of ballast, sleepers, and rails is very old and has stood the test of time. Taking the ballastless track structure in highspeed railway as the research object, the wave motion of periodic ballastless track is studied using the wave finite element method. In order to study ballastless track rail of the highspeed railway, we established a practicable experi.
Specifically, crts chinese railway track system iii ballastless track is a unitplate type ballastless track, which is researched and developed based on the advantages of other well established ballastless tracks in china. For clarity it is often referred to as railway track or railroad track. Due to increasing traffic flows the extension of transport infrastructure with rail roads and high speed lines is an ongoing process worldwide. The track on a railway or railroad, also known as the permanent way, is the structure consisting of the rails, fasteners, railroad ties and ballast, plus the underlying subgrade.
Comparison between ballasted track and ballastless track no. In taiwan, railway bridges with ballastless track have been in use for many years, with ballastless track turnouts also starting to be constructed in recent years. There are many types of ballastless tracks used in china by now, including the unitplate type and the continuous type ballastless tracks. With changes in external temperature, the temperature in every structural layer will vary. Li key laboratory of road and traffic engineering of the ministry of education, tongji university, china abstract with the rapid development of the highspeed railway in china, a great challenge. Patil group is the pioneer in bringing ballast less tracks for the metro. Provide a level base for uniform transmission of track rail forces.
Railway technology department of vehicle engineering royal institute of technology track geometry for highspeed railways a literature survey and simulation of dynamic vehicle responce by. It can be concluded by the description above that the ballastless track system of the present invention is high in reliability, good in durability, and easy in construction and maintenance. The railway companies in austria and germany use ballastless track systems for many. Slab track design railway track laying by stabirail. Analysis and design of steel bridges with ballastless track. May 19, 2018 dosto es video me ballestless railway track k bare me bataya gya hai janane k liye video ko pura dekhiye achha lage to like kijiye share kijiye. Highspeed railway track, transition zone, auxiliary rail, sleeper. Stability, precision, and comfort a ballastless track assures a permanently stable track and can withstand the heavy load of highspeed train traffic. Therefore, slab track design incurs significantly lower maintenance. Moreover, the failure of castinsitu ballastless track especially crack and deterioration of concrete has been observed at the many places in india. Aimed at this problem, the calculation model of water pressure under the train load was established on the basis of fluidstructure interaction theory, and the influence of crack geometry and.
1433 1362 715 493 1029 192 1471 1144 648 1396 1103 1462 407 548 126 799 411 804 537 935 817 431 1324 633 1077 1074 1469 1016 1236 217 992 525