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RU 800 S
Combination machine for track renewal and ballast bed cleaning
Today, the central focus of a modern maintenance strategy is on economical deployment of track maintenance machines. In order to utilise track possessions as fully as possible there is a need for high-capacity machines. Nowadays, the trend is going towards combination machines which combine several stages of work in one machine. A good example of such a machine is the RU 800 S the world’s first combination machine for continuous track renewal and simultaneous ballast bed cleaning with supply of new ballast.
Composition and function of the machine
The heart of the machine is the track relaying machine itself with an integrated ballast bed cleaning system. During working operation the central undercarriage is raised by a spindle and the two four-axled bogies are displaced by 4.500 mm to the front or to the rear in order to obtain a clear working area of 45 m. This long space ensures a smooth bending line of the rails during removal and laying.
The old-tie pick-up unit picks up the old ties in continuous working action and transports them on conveyor belts to the old-tie transfer platform. Then the ballast is excavated using an excavating chain which can achieve an excavating depth up to 800 mm below top of rail. The old ballast is taken on conveyor belts to the double screening unit. The screens separate the spoil from the re-usable ballast. Then the cleaned ballast and the new ballast is taken back for insertion. A plough distributes the ballast in the ballasting area, taking care that the area in the centre of the track is lower to avoid centrebound ties. Then the inserted ballast is compacted using plate consolidators. Immediately after this, the new ties are placed at the correct tie spacing. Due to the limited space available, the new ties are transported through the machine parallel to the track axis. For that reason the new ties are turned, two at a time, inside the machine just after the transfer platform and turned back just before the laying unit. The supply of new ties and evacuation of old ties is carried out by two gantry units which can pick up 30 ties at a time. The gantry units run on rails mounted on the sides of the cars. For transfer travel two 4-axled wagons with arched frames are used to transport the gantry units. During work the remaining rail fastenings are loosened underneath the frame of the first wagon. The drive engines are also mounted on this wagon. The second wagon carries the measuring equipment and a water tank.
After the relaying machine follows the shoulder excavation car. Two shoulder cutters pick up the remaining ballast and pass it to conveyor belts for transport to the screening car. The excavating width can be varied between 600 mm and 1.250 mm depending on the cutter head.
The following ballast storage and ballast distributing car is equipped with a 30 m³ buffer store for new ballast and/or cleaned ballast. The floor of the hopper is designed as a conveyor belt. Ballast distributing devices for the shoulders and for the tie cribs are mounted behind the hopper. In addition to this, an automatic action eight-spindle power wrench is mounted on the ballast hopper car which is suspended on the main frame so that it is longitudinally displaceable and tightens the rail fastenings in cyclic action.
When Fastclips are used, the eight-spindle module is replaced before start of work by a Fastclip clipping unit.
The ballasting and power wrench car is followed by the screening car. Two eccentric vibratory screens are in operation, as already used on other highcapacity ballast cleaning machines. The screens separate the re-usable ballast from the spoil. A total screening area of 46 m² guarantees the required output.
Material conveyor and hopper units are used to transport the spoil and the ballast. These are coupled to the end of the machine. To transport the spoil, the new-ballast MFS is equipped additionally with a conveyor belt.
Method of Work
Range of applications of the RU 800 S
Advantages of the machine