Abstract: A method for the correction of vertical position error of a track by a track tamping machine and a dynamic track stabilizer. Starting from a registered actual position, an over-lift value is prescribed for a treated track location with which the track is lifted into a preliminary over-lift track position and tamped. The track is subsequently lowered by dynamic stabilization into a resulting final track position. In this, a smoothed actual position course is formed from a course of the actual track position, wherein an over-lift value is prescribed for the treated track location in dependence of the course of the actual track position with regard to the smoothed actual position course. In this way, only short-wave track faults are treated with an over-lift value.

Abstract: The present disclosure generally relates to a road rail stoneblower vehicle for carrying out rail maintenance operations near fixed structures such as bridges and overpasses. The road rail stoneblower includes a hi-rail chassis having a first set of wheels configured to engage a road surface and a second set of wheels configured to engage surfaces of substantially parallel rails of a railroad track. The road rail stoneblower further includes a plurality of workheads that are capable of dispensing ballast stones into a bed of ballast underlying the railroad track to adjust the height of the rails. The road rail stoneblower further includes a leveling system detachedly coupled to the hi-rail chassis that is configured to transmit a detectable signal that defines a reference plane with which the rails are to be aligned. Related methods of operation of the road rail stoneblower vehicle and associated maintenance of ballast beds underlying railroad tracks are also described.

Abstract: The present disclosure generally relates to a railroad chassis vehicle having independently operable workheads for carrying out rail maintenance operations on non-uniform sections of railroad tracks. Related methods of operation of the railroad chassis and associated maintenance of ballast beds underlying railroad tracks are also described.

Abstract: An object of the present invention is to provide a method for accurately modifying a concrete slab on subsided ground by injecting an expandable resin below the concrete slab more than once, which also allows for easy control of the work process. The method of the present invention as a means for resolution includes performing the following steps: on a concrete slab in an area including a region where ground subsidence has occurred, determining points to drill injection holes for injecting an expandable resin at a pitch of 0.5 to 2.0 m in a grid pattern; injecting an expandable resin below a point where the subsidence of the concrete slab is severest and expanding the expandable resin to push up the concrete slab at most 30 mm more than once.

Abstract: A method of treating particulate, in substance including selecting a load based on a planned in use loading of the particulate; applying the load to the particulate; injecting material below the load; and removing the load.

Abstract: A method and an apparatus for the protection of a railroad rail, a direct fixation plate or another support unit, a rail to rail connection and a rail to plate connection contacting with concrete upon placing of concrete during construction. The method comprises a step of disposing a mask over a railroad track having a railroad rail, a rail connector and a rail tie to protect the railroad track while placing concrete, the mask configured to cover the rail connector and tie. The mask has a connecting portion, a central portion, an extending portion configured to mask an upper longitudinally extending portion of a railroad rail, and at least one perpendicular section disposed to cover a railroad tie, direct fixation plate or other support unit.

Abstract: A stoneblower having a workhead and associated blowing tubes that adjust to skewed ties and to nonvertical tie faces. The workhead provided several degrees of movement to the blowing tubes, enabling them to be individually aligned with each tie along the length of track being worked. The blowing tubes can be pre-tilted to match the face angle of the ties. Proper location of the blow tubes is detected by monitoring the tilt change of the tube engendered when the tubes engage the ties. The blowing tubes include an elongated stone exit opening that extends both above and below the tie when the tube is inserted into the ballast. The opening therefore provides a stone discharge below the tie and an overflow above the tie. A finger extends from the lower end of the blowing tube to enable the stoneblower to sense the location of the railroad track ties without scooping ballast into the tube openings.

Abstract: Ballastless railroad lines are laid on prefabricated reinforced concrete slabs, which can eliminate the need for periodic maintenance of the ballast of traditional railroad lines, such maintenance being expensive and often difficult to carry out. Prefabricated, possibly prestressed, slabs are thereby positoned upon a steel reinforced concrete block having the functions of a foundation and connector for the prefabricated slabs with the interposition of a concrete-asphalt mortar layer between the slabs and block. The slabs are secured to the foundation block either by means of two half-cylinders, forming parts of the slab structure, or by shoulders formed by upturned sides of the foundation block (tub).

Abstract: In a method for automatically leveling a track comprised of two rails fastened to a succession of ties supported on a ballast bed to establish a desired track level, wherein successive track sections including a respective one of the ties are consecutively raised, additional track bed material is blown under each one of the raised ties to fill a gap between the ballast bed and each raised tie, and the raised track sections are lowered after the additional track bed material has been blown under the raised ties, the steps of measuring the existing track level at each tie to be raised and obtaining a corresponding parameter, establishing the difference between the parameter corresponding to the existing track level and a parameter corresponding to the desired track level, raising each successive track section above the desired track level, and controlling the amount of the additional track bed material blown under each raised tie at a point of intersection between the tie and a respective one of the rails in pr

Abstract: A mobile track leveling machine comprises a pneumatic arrangement for introducing additional ballast into a gap between a track bed and a lifted track, which includes a storage container for the ballast, a vertically adjustable pipe arranged to receive ballast from the storage container and to be immersed in the track bed alongside a longitudinal edge of a respective track tie, the pipe having a tapered end for ready penetration into the track bed and a flattened side defining an outlet for the additional ballast facing the longitudinal tie edge. Compressed air is delivered into the pipe for moving the additional ballast therethrough and out of the outlet.

Abstract: A method of re-levelling railway track of the kind having rails fastened to sleepers supported on a ballast bed is disclosed. The method comprises lifting the sleepers off the ballast bed and pneumatically placing ballast stones by an air stream in the gap formed between the underside of a lifted sleeper and the underlying ballast bed using a tool which is driven into the ballast bed adjacent a side face of the sleeper to a depth such that an outlet for the ballast stones propelled by the air stream is provided at the level of the gap. The tool used comprises a spade-like member having a channel along which the air stream and the ballast stones are fed into the gap, the member being disposed so that its channel extends generally downwardly with its mouth facing the sleeper side face and the length of the channel being greater than the depth of the channel.

Abstract: A method of and arrangement for correcting the height of a railway upper structure with a reinforced concrete plate thereon into which plate a reinforced concrete part as support for rail holding members is so inserted that the reinforced concrete part is positioned above a just finished or poured concrete section of the reinforced concrete plate in conformity with its end position and is subsequently lowered and jarred into the not yet hardened concrete of the reinforced concrete plate.

Abstract: A method and apparatus for forming a railroad grade crossing comprising a vehicular supporting structure formed by a plurality of precast slabs fixedly located between and on opposite sides of a pair of running rails. A variety of slabs are provided for accommodation of multiple, switch and curved sections of track, with each slab being adjustably positioned relative to the elevation of the rails by temporary shims located proximate each of the marginal corners thereof and carried on the longitudinally spaced railroad ties. A supporting bracket is provided for fixedly connecting the slabs to the running rail. The structure is subsequently supported on a plurality of initially deformable pads located on the railroad ties and which are compressed and preformed to accommodate all inconsistencies and irregularities of the ties. In installations involving signal control sections of track, the supporting bracket is insulated from the running rails whereby to preclude any interference therewith.

Abstract: A track or switch tamping machine wherein the machine includes tamping and ramming units having longitudinal ducts for injecting liquid binder into the ballast. The longitudinal ducts terminate in a plate or cavity within the lower portion of the tamping and ramming units. A nozzle is also included in the unit as is means for conveying liquid binder from a storage tank carried on the machine.

Abstract: While a tamping unit with tamping tools for tamping track ballast is lowered to immerse the tamping tools in the ballast and to tamp the same, a metered amount of a liquid bonding medium is delivered to and through internal conduits in the tamping tools and ejected through an opening under pressure thereby to bond together pieces of ballast coated by the ejected bonding medium. The commencement and termination of the bonding medium delivery is controlled in response to the depth of immersion of the tamping tools in the ballast.